WO1999017469A1 - Systeme de communication mobile - Google Patents
Systeme de communication mobile Download PDFInfo
- Publication number
- WO1999017469A1 WO1999017469A1 PCT/JP1997/003492 JP9703492W WO9917469A1 WO 1999017469 A1 WO1999017469 A1 WO 1999017469A1 JP 9703492 W JP9703492 W JP 9703492W WO 9917469 A1 WO9917469 A1 WO 9917469A1
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- WIPO (PCT)
- Prior art keywords
- base station
- mobile
- information
- time slot
- switching
- Prior art date
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- 238000010295 mobile communication Methods 0.000 title claims abstract description 122
- 230000006870 function Effects 0.000 claims abstract description 79
- 238000004891 communication Methods 0.000 claims description 123
- 230000006854 communication Effects 0.000 claims description 123
- 230000005540 biological transmission Effects 0.000 claims description 110
- 238000000034 method Methods 0.000 claims description 68
- 238000012546 transfer Methods 0.000 claims description 10
- 238000012545 processing Methods 0.000 abstract description 19
- 230000015654 memory Effects 0.000 description 34
- 238000010586 diagram Methods 0.000 description 31
- 230000008569 process Effects 0.000 description 29
- 230000007480 spreading Effects 0.000 description 11
- 238000012937 correction Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 230000003111 delayed effect Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 230000001413 cellular effect Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000011664 signaling Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 2
- DWCMDRNGBIZOQL-UHFFFAOYSA-N dimethylazanide;zirconium(4+) Chemical compound [Zr+4].C[N-]C.C[N-]C.C[N-]C.C[N-]C DWCMDRNGBIZOQL-UHFFFAOYSA-N 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
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- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007175 bidirectional communication Effects 0.000 description 1
- 230000010267 cellular communication Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2618—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using hybrid code-time division multiple access [CDMA-TDMA]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
Definitions
- the present invention relates to a TDMA (Time Division Multiple Access (TDMA)) method, or a time division CDMA (CDMA; C 0 deDivision Multi Access) code division multiple access. )
- TDMA Time Division Multiple Access
- CDMA Code Division Multiple Access
- CDMA Code Division Multiple Access
- CDMA Code Division Multiple Access
- CDMA Code Division Multiple Access
- a frequency channel sharing or time slot sharing using a multiple access method such as a system the communication capacity of the uplink (Up-link) and the downlink (Down-link) is different.
- the present invention relates to a mobile communication system capable of performing one handover, including a function that can use a line as one communication channel (hereinafter referred to as an asymmetric communication channel).
- a mobile communication system mainly includes a mobile station such as a mobile communication device or a mobile communication device, and a wireless base station that communicates with the mobile station via a wireless channel.
- FDMA Frequency Division Multiple Access
- CDMA Code Division Multiple Access
- frequency channel sharing between different codes has already been implemented. Handover in these systems is already known.
- Japanese Patent Application No. 8-137066 which has already been filed separately, has been filed. Although it is disclosed in gazettes and the like, it does not mention an asymmetric communication channel for uplink and downlink and handover in high-speed data transmission.
- the technology related to the mobile communication system that is shared by the time slot and the frequency channel, and the wireless local loop (Wireless local loop) Japanese Patent Application No. 9-11885356 also describes synchronization between wireless base stations using a semi-fixed communication device (hereinafter referred to as a WL L station) or the like based on local loop (hereinafter referred to as WL L).
- a WL L station semi-fixed communication device
- WL L local loop
- US Pat. No. 5,363,403 As a mobile communication system that shares a plurality of CDMA signals, US Pat. No. 5,363,403 is known. However, the specification does not describe how to handle time division CDMA signals. As another mobile communication system, U.S. Pat. No. 5,511,068 is also known, which relates to an adaptive filter in a time division CDMA signal system. The specification mentions the sharing of frequency channels for CDMA and TDMA signals in one time slot, and the handover in high-speed data transmission. Not.
- No. 6 5 1 2 is known.
- the present invention deals with handover in a cellular (Ce11 uar) communication system, in which a time slot of a time-division CDMA signal and a TDMA signal in one time slot is handled. No mention is made of mobile communication systems that share a common network or have an asymmetric communication channel.
- US Pat. No. 5,410,568 is also known for a communication system in which TDMA technology is applied to a CDMA communication system.
- This patent puts a synchronization code (Synchronization code) at the beginning of a CDMA communication frame, that is, at the beginning of a burst.
- the TDMA control channel is used to set the frame synchronization. It does not introduce the time-sharing CDMA method, nor does it mention coexistence with the TDMA method. In other words, this does not mean that the TDMA frame and the time division CDMA system are shared using the TDMA frame. Further, this patent does not take into consideration any communication channel in which the communication capacity between the uplink and the downlink is asymmetric, and does not mention handover in high-speed data transmission.
- Japanese Patent Application Laid-Open No. 7-323232, Japanese Patent Application Laid-Open No. 8-154424, Japanese Patent Application Laid-Open No. 8-280556, and the like are known.
- Japanese Patent Laid-Open Publication No. Hei 6-222,644 discloses a technique for one handover in a TDMA cellular system.
- an asymmetric channel having different transmission capacities for uplink and downlink has been proposed. All items related to handover in high-speed data transmission Not touched.
- the radio signal strength from a radio base station is measured, and the radio signal strength is ordered in descending order, and the order is determined.
- a technique for associating with the rank of the mobile station and selecting a handover candidate based on the priority is disclosed.
- Japanese Patent Application Laid-Open No. 8-280556 discloses that in a TDMA or CDMA cellular system, a data buffer is provided in a radio base station, and a data buffer is provided between adjacent base stations. Techniques for achieving instantaneous uninterrupted handover by synchronizing are disclosed.However, mobile communication with an asymmetric channel in which the uplink and downlink have different transmission capacities, and handover in high-speed data transmission are disclosed. There is no mention of a do-a-bar.
- a mobile communication system composed of one or more radio base stations communicating with a plurality of mobile stations via a radio channel and using the TDMA system and the time-division CDMA system includes the various types described above.
- the need to introduce high-speed data transmission is increasing, but a mobile communication system that can adequately cope with such needs has not yet been realized.
- the mobile communication system was designed to support multimedia. In order to do so, it was necessary to introduce communication channels with different communication capacities for the uplink and downlink.
- the present invention has been made to solve the above-described problems.
- a high-speed data channel is introduced into a mobile communication system in which a TDMA signal and a time-division CDMA signal coexist, and the uplink and downlink are different.
- the purpose of the present invention is to realize a multimedia-capable mobile communication system capable of handover in a mobile communication system in which communication lines having a communication capacity are assigned as a set of communication channels. Disclosure of the invention
- a mobile communication system includes a mobile switching center having a TDMA signal and a time slot sharing / frequency channel sharing time division CDMA signal, and having a control function of allocating the signal on a time axis and a frequency axis,
- the mobile station and the radio base station connected to the mobile switching center are wirelessly connected by a multiple access method, and each downlink frame transmitted from two adjacent radio base stations to one mobile station is transmitted.
- the information of each time slot is assigned a serial number from the mobile switching center to which those radio base stations are connected.
- the mobile communication system has a function of detecting a serial number included in information of each time slot in a frame of two downlinks transmitted from two radio base stations.
- Mobile station ⁇
- the mobile communication system uses a sequence number included in each time slot information in a frame of a signal transmitted to a radio base station, for each radio channel multiframe number or an integer multiple thereof.
- the mobile switching center has the function of setting repeatedly.
- the mobile communication system includes a serial number included in information of each time slot in a frame of a signal transmitted from a wireless base station (switching base station) with which the mobile station is communicating; The sequence number included in the information of each time slot in the frame of the signal transmitted from the radio base station (switch destination base station) whose connection is switched by the movement of the mobile station.
- the mobile station has the function of generating a repetition code based on the difference between the two serial numbers by comparing the reception and detection, and transmitting it to the mobile switching center via the switching base station. .
- the repetition code when the signal transmitted from the switching destination base station is slower than the signal transmitted from the switching source base station, the repetition code is set to a negative number and transmitted from the switching destination base station. If the signal is earlier than the signal transmitted from the switching source base station, the repetition code is a positive number.
- a serial number included in information of each time slot in a frame of a signal transmitted from the switching source base station, and a signal transmitted from the switching destination base station is received, detected, and compared with the serial number included in the information of each time slot in the frame of the signal, and the signal transmitted from the switching source base station. If it is later than that, at the time of handover, the time slot information of the signal newly received from the switching destination base station is changed according to the contents of the repetition code based on the difference information between the two serial numbers.
- the mobile station has the function of discarding a large number. This allows the switching destination Adjustment of the information delay when the signal of the base station is slower than the signal of the switching source base station is performed in the mobile station, and the discontinuity of information that occurs at the time of handover can be easily avoided.
- the mobile switching center is of the ATM type, and a serial number included in the information of each time slot in the frame is added with a new header at the beginning of the ATM bucket.
- the function to be realized is provided in the mobile switching center.
- the mobile communication system provides a public network bucket when the number of information bits that can be transmitted by one time slot of a wireless channel is smaller than the number of information bits of a public network bucket transmitted through the public network.
- This is a packet in which each piece of information is divided for each time slot information bit of the wireless channel, and a bucket is formed, and the mobile switching center has a function of transmitting the information to the wireless base station.
- the mobile communication system divides information of a public network packet when information bits that can be transmitted by one time slot of a radio channel are larger than information bits of one public network packet.
- the mobile switching center has a variable bucket information amount function that transmits the packet to the wireless base station without any change.
- an exchange interface of a radio base station is an ATM type.
- a serial number included in information of each time slot in a frame of a signal transmitted from a switching source base station, and a signal transmitted from a switching destination base station The mobile station has a function to receive, detect, and compare the sequence numbers contained in each time slot information in the frame, and to generate a repetition code based on the difference information between the two sequence numbers. And when it becomes a destination base station, If the signal to be transmitted is earlier than the signal transmitted from the switching source base station, the time slot information of the signal already transmitted to the mobile station is transmitted to the mobile station by the repetition code command during handover.
- the function to transmit the signal to the mobile station at the same time as the handover and to transmit the signal to the mobile station sequentially with the stored time slot information at the beginning is provided to the radio base station. It is what you have. As a result, when the signal of the switching destination base station is earlier than the signal of the switching source base station, the switching destination base station performs the last time slot of the previous frame by the number indicated by the content of the repetition code. By retransmitting this information and equalizing the information delay from each radio base station at the mobile station, it is possible to easily avoid discontinuity of the information that occurs at the time of handover.
- a mobile communication system includes a mobile switching center having a TDMA signal and a time slot sharing / frequency channel sharing time division CDMA signal, and having a control function of allocating the signal on a time axis and a frequency axis,
- a mobile station and a wireless base station connected to this mobile switching center are wirelessly connected by a multiple access method, and a mobile station having a high-speed data transmission function can be wirelessly connected to a wireless base station even with a high-speed data channel.
- the serial number is given to the information of the cross-lot from the mobile switching center to which those radio base stations are connected. As a result, a handy call between wireless base stations at the time of high-speed data transmission can be realized by a unified process based on the serial numbers.
- the mobile communication system according to the present invention is transmitted in each time slot in two downlink frames transmitted from two radio base stations.
- the mobile station has a function to detect the serial number included in the information of each micro-slot of the high-speed data transmission channel.
- the mobile communication system includes the information of each microslot of the high-speed data transmission channel transmitted in each time slot in the frame of the signal transmitted to the radio base station.
- the mobile switching center has the function of repeatedly setting the sequence numbers set for each multiframe number of the radio channel or an integer multiple thereof.
- a mobile communication system as set forth in claim 15, wherein each of the high-speed data transmission channels is transmitted in each time slot in a frame of a signal transmitted from the switching source base station.
- the serial number included in the information of the microslot of the high-speed data transmission channel transmitted in each time slot in the frame of the signal transmitted from the switching destination base station and the microslot of each It receives, detects, and compares the sequence number included in the packet information to generate a repetition code based on the difference information between the two sequence numbers, and sends it to the mobile switching center via the switching base station.
- the mobile station has the function of transmitting.
- each micro-cross of the high-speed data transmission channel transmitted in each time slot in the frame of the signal transmitted from the switching source base station at the time of handover.
- the serial number included in the packet information and the microslots of the high-speed data transmission channel transmitted in each time slot in the frame of the signal transmitted from the switching destination base station If the signal transmitted from the switching destination base station is slower than the signal transmitted from the switching source base station by receiving, detecting, and comparing with the serial number included in the packet information, During the switchover, the microslot information of the signal newly received from the switching destination base station is The mobile station has a function to discard as many as the number of repeat codes based on the difference information between these two serial numbers. As a result, the information delay is adjusted in the mobile station when the signal of the switching destination base station is slower than the signal of the switching source base station during high-speed data transmission, and the information generated when a high-speed data transmission handover occurs. Can be easily avoided.
- each of the high-speed data transmission channels transmitted in each time slot in the frame of the signal transmitted from the switching source base station is individually controlled.
- the serial number included in the cross-port information and the micro-cross port of each high-speed data transmission channel transmitted in each time slot in the frame of the signal transmitted from the switching destination base station The mobile station has a function to generate a repetition code based on the difference information between the two serial numbers by receiving and detecting the serial number contained in the mobile station information. If the signal to be transmitted is earlier than the signal transmitted from the switching source base station, the signal of the signal that has already been transmitted to the mobile station is issued at the time of handover by a repeat code command.
- Cross slot information is stored in a number corresponding to the contents of the repetition code, and at the same time as handover, the signal to the mobile station is transmitted starting from the stored micro slot information.
- This is a function in which the base station has the function of transmitting sequentially.
- the switching destination base station has the same number of previous signals as indicated by the contents of the repetition code.
- a repetition code received from a mobile station via a switching source base station is transmitted to a switching destination base station simultaneously with a handover decision.
- the mobile switching center has a function of transmitting to the office.
- a mobile communication system includes a mobile switching center having a TDMA signal, a time slot sharing, and a frequency channel sharing time division CDMA signal, and having a control function of allocating the signal on a time axis and a frequency axis.
- a mobile station and a radio base station connected to the mobile switching center are wirelessly connected by a multiple access method, and information contained in a time slot received from the mobile station is transferred to the mobile switching center, a wireless connection is established.
- This is a function that the radio base station has a function to add the serial number related to the multiframe of the channel to the information from the mobile station. This makes it possible for the mobile switching center to identify the order of the information transmitted by the mobile station, and avoids a mistake in the order of information transmitted from the mobile switching center to the public network during a handover. can do.
- a mobile communication system provides a mobile switching center with a function of detecting a sequence number associated with a multi-frame of a wireless channel, which is included in information on a time slot transmitted from a wireless base station.
- the serial number associated with the multi-frame of the radio channel which is included in the information of the time slot to be transferred to the mobile switching center, is determined by the number of multi-frames of the radio channel or an integer multiple thereof. In this case, a function of repeatedly setting the wireless base station is provided.
- the mobile communication system provides an information bucket for transferring, to a mobile switching center, a serial number associated with a multi-frame of a radio channel, which is included in information on a time slot transferred to the mobile switching center. This is a function in which the radio base station has a function of adding a header at the beginning.
- the headers of the information buckets transferred from the two radio base stations are each included in the header.
- the mobile switching center has a function to check the sequence numbers that exist and to transmit information packets to the public network, and to transmit them in order so that the sequence numbers are arranged in order.
- a mobile communication system includes a storage unit for storing, in a mobile station used therein, information included in a time slot received from a radio base station or information of a micro slot in the time slot.
- a control means is provided for discarding the information stored in the storage means by the number specified by the contents of the repetition code at the time of a failover.
- the mobile communication system accumulates, in a radio base station used for the information, information contained in a time slot transmitted just before a handover or a report of a microslot in the time slot.
- Storage means and control means for storing the information transmitted immediately before the handover in the storage means for the number specified by the contents of the repetition code, and for retransmitting the information stored in the storage means at the time of the handover Is provided.
- a mobile communication system includes a mobile switching center having a TDMA signal and a time slot sharing / frequency channel sharing time division CDMA signal, and having a control function of allocating the signal on a time axis and a frequency axis.
- Stations and radio base stations connected to this mobile switching center are connected wirelessly by a multiple access method, and additional communication is performed between the mobile switching stations rather than via the public network. It is designed to be directly connected by a line. In this way, the occurrence of handover can be made independent of the public network by setting an additional communication line that directly connects the mobile switching centers and a header that passes through the mobile switching centers.
- the mobile communication system when performing a handover between a switching source base station and a switching destination base station connected to different mobile exchanges, communicates with the mobile station after the handover Information from the switching destination base station is transmitted from the mobile switching center to which the switching destination base station is connected to the public network via the additional communication line and the mobile switching center to which the switching source base station is connected. It is made to be done.
- the mobile communication system according to the present invention is transmitted from the mobile switching center connected to the switching destination base station to the public network via the additional communication line and the mobile switching station connected to the switching source base station. If the communication is resumed after the communication of the information from the switching destination base station is completed, the information from the mobile station will be transmitted from the switching destination base station to the mobile station to which the switching destination base station is connected. It is transmitted directly to the public network via an exchange.
- the mobile communication system according to the present invention is such that a plurality of mobile switching centers connected by an additional communication line belong to different operators.
- a handover between radio base stations connected to mobile switching centers belonging to different operators can be handled in the same manner as a handover between radio base stations belonging to the same operator.
- a plurality of mobile switching centers connected by an additional communication line are of the ATM type.
- an additional communication line connecting a plurality of mobile switching centers is an ATM type.
- a mobile communication system includes a plurality of mobile switching centers. If the mobile station is still in a call after handovering the wireless base station, the information from the switching destination base station that is currently communicating with the mobile station is connected to the switching destination base station.
- the mobile switching center transmits the data to the public network from the mobile switching center to which the switching source base station is connected via the plurality of mobile switching centers and a plurality of additional communication lines connecting them. Is like
- FIG. 1 is a system configuration diagram showing an overall configuration diagram of a mobile communication system according to Embodiment 1 of the present invention.
- FIG. 2 is an explanatory diagram showing a personal time communication system using time-division CDMA, a Psr nal C ommun i c a t io n S y s t em; hereinafter, referred to as a PCS, and a time slot configuration for cellular in the first embodiment.
- a PCS Psr nal C ommun i c a t io n S y s t em
- FIG. 3 is an explanatory diagram showing an example of non-uniformity of delay time in the first embodiment.
- FIG. 4 is an explanatory diagram showing an example of an information transmission time difference depending on a transmission path difference between adjacent wireless base stations at the time of handover in Embodiment 1 above.
- FIG. 5 is a block diagram showing a configuration of a mobile switching center having a function of assigning a serial number to each frame in the first embodiment.
- FIG. 6 is an explanatory diagram showing the correspondence between the structure of the public network bucket and the structure of the wireless channel in the first embodiment.
- FIG. 7 is an explanatory diagram showing an example of an information transmission time difference depending on a transmission path difference between adjacent radio base stations at the time of handover according to Embodiment 2 of the present invention.
- FIG. 8 is a time chart showing a handover process in the second embodiment.
- FIG. 9 is an explanatory diagram showing an example of a time slot structure in a frame of TDMA high-speed overnight communication according to Embodiment 3 of the present invention.
- FIG. 10 shows an example of the microslot structure at the time of handover of the high-speed TDMA data channel in the case where the information of the switching destination base station is later than the information of the switching source base station in the third embodiment.
- FIG. 11 is an explanatory diagram showing an example of a microslot structure at the time of handover according to Embodiment 4 of the present invention.
- FIG. 12 is an explanatory diagram showing a structure of an ATM packet and radio channel information according to the fifth embodiment of the present invention.
- FIG. 13 is a block diagram showing a configuration of a mobile station according to Embodiment 6 of the present invention.
- FIG. 14 is a block diagram showing a configuration of a radio base station according to Embodiment 7 of the present invention.
- FIG. 15 is a block diagram showing the internal configuration of the signal processing unit according to the seventh embodiment.
- FIG. 16 is a system configuration diagram showing an overall configuration diagram of a mobile communication system according to Embodiment 8 of the present invention.
- FIG. 1 shows a time slot sharing and frequency channel sharing system according to the present invention.
- FIG. 1 is a system configuration diagram showing an overall configuration diagram of a mobile communication system to which a system is applied, in which information from a radio base station to which a mobile station is handed over (hereinafter, referred to as a switching destination base station) is used. The embodiment is shown when the information is slower than the information from the wireless base station that is communicating first (hereinafter referred to as the switching base station).
- 1 is a public network (PSTN)
- 2 is a database stored in the public network 1
- 3 4 and 5 are exchanges belonging to the public network 1.
- 6, 7, and 8 are mobile switching centers (MSCs) that have TDMA signals, time slot sharing, frequency channel sharing (including non-frequency sharing) and time-division CDMA signals.
- the mobile switching center 6 is connected to the switching system 3 of the public network 1
- the mobile switching center 7 is connected to the switching system 4
- the mobile switching center 8 is connected to the switching system 5 by wire. ing.
- Radio base stations 11 and 13 are radio base stations (BS), radio base stations 11 and 13 are connected to mobile switching center 6, and radio base station 21 is connected to mobile switching station 7.
- the radio base station 31 is connected to the mobile switching center 8 and controlled by its respective mobile switching center (MSC).
- MSC mobile switching center
- 1, 2, 1, 2, 2, and 3 2 are radio coverage areas (hereinafter referred to as cells) constituted by the radio base stations 11, 1, 3, 21, or 31, and cell 1 2 is a radio base station.
- Cell 14 is configured by radio base station 13; cell 22 is configured by radio base station 21; cell 32 is configured by radio base station 31.
- 15, 16, 17, 18, 24 and 33 are the radio base stations 11, 1, 3 and 2 that make up the cells 12, 14, 22 and 32 in which they are located.
- Conventional mobile communication devices that mainly use voice communication such as mobile in-vehicle communication devices and mobile portable communication devices that communicate with 1 and 3 1 via wireless channels.
- it is an ordinary mobile station (MS) using a mobile communication device for multimedia mainly for data communication.
- 23 is a semi-fixed WLL station (WS) that communicates with the wireless base station 21 via a wireless channel.
- These ordinary mobile stations (MS) and WLL stations (WS) communicate with the radio base station (BS) via medium / high-speed TDMA channels. It has a function to perform voice or low-speed data communication via a time-division CDMA channel and a low-speed TDMA data channel.
- these ordinary mobile stations (MS) and WLL stations (WS) are collectively called mobile stations.
- a signal is transmitted through a communication channel modulated by a digital modulation method. And exchanges data using the FDMA / TDD (TDD; Time Division Dup 1 ex; time-division bidirectional communication) or CDMA / TDD method, and the multi-carrier TDMAZ FDD (FDD; Frequency Dvision Dup). lex; frequency division two-way communication), TDMA / TDD, time division CDMA / FDD, time division CDMA / TDD, etc.
- TDD Time Division Dup 1 ex
- CDMA / TDD CDMA / TDD
- FDD Frequency Dvision Dup
- FIG. 2 is an explanatory diagram showing a time slot configuration for PCS and cellular by time-division CDMA according to the first embodiment, where the transmission capacity of the uplink and downlink such as high-speed TDMA data transmission is asymmetric. This shows an example in which a downlink 1 ⁇ is added to a simple mobile communication system.
- # 4 1—T 0 / R 0 to # 4 1 1 T 2 / R 2 and # 4 1 1 T 3 are time slots for PCS
- # 47—T 1 / R 1 and # 47 — T2 / R2 is a cellular time slot.
- # 44—T0 / R0 is the time slot for TDMA medium speed data communication
- # 51 — T 3 and # 51-T 7 A are time slots for TDMA high-speed data communication
- # 52-T7C indicates a time slot for time division CDMA high-speed data communication.
- the time slot for low-speed TDMA shows an example used as audio data or low-speed data or as a control channel.
- 5 slots are assigned to the down-link from radio base stations 11 to 3 1 to mobile stations 15 to 3 3, and 3 time slots from Re to R 2 move.
- Stations 15 to 33 are assigned to uplinks from radio base stations 11 to 31.
- the asymmetric TDD scheme has different communication capacities between the uplink and downlink.
- 53 indicates one frame length
- 54 and 55 indicate half frame lengths.
- 56 is the downlink time slot length from the high-speed data communication radio base stations 11 to 31 to the mobile stations 15 to 33
- 57 is the radio time slot from the high-speed data communication mobile stations 15 to 33.
- the time slot length goes up to base stations 11 to 31.
- 58 and 59 are downlinks from the wireless base stations 11 to 31 to mobile stations 15 to 33, and uplinks from the mobile stations 15 to 33 to the wireless base stations 11 to 31.
- Frame time that is the boundary of
- FIG. 3 is an explanatory diagram showing an example of non-uniformity of delay time due to an example of the arrangement of the wired lines from the database 2 to the wireless base stations 11 to 31 and the exchanges 3 to 5 of the public network 1.
- the same signal sent from one database 2 This shows an example in which the delay time before reaching the radio base station (BS) differs due to different routes. That is, as shown in FIG. 3, the signal 63 passes through the exchange (SC) in the public network 1 once less than the other signals 61 and 62, so that the signal arrival time differs. It is thought that there is.
- FIG. 4 is an explanatory diagram showing an example of an information transmission time difference depending on a transmission path difference between adjacent wireless base stations at the time of handover.
- 71 is the corresponding frame of the radio wave of the switching source base station
- 72 is the corresponding frame of the radio wave of the switching destination base station
- each frame has 81, 82, 83, 8 4
- ⁇ ⁇ ⁇ ⁇ is given a serial number by the mobile switching center.
- 7 3 is a frame corresponding to the received radio wave of the mobile station at the time of handover
- 7 4 is a sequence number of the corresponding frame 7 1 of the radio wave of the switching source base station.
- This is a repetition code assignment period in which a repetition code (Repetition Code), which is the number difference information between the signal and the serial number of frame 72 corresponding to the radio wave of the switching destination base station, is assigned.
- Repetition Code which is the number difference information between the signal and the serial number of frame 72 corresponding to the radio wave of the switching destination base station
- FIG. 5 is a block diagram showing a configuration of a mobile switching center having a function of assigning the above-mentioned serial number to each frame.
- reference numeral 6 denotes a mobile switching center (MS C 1) which is denoted by the same reference numeral in FIG. 1
- reference numerals 11 and 13 denote radio base stations (BS 11 1) connected to the mobile switching center 6.
- BS 13 1 is a public network (PSTN) in which the mobile switching center 6 is accommodated
- PSTN public network
- reference numeral 91 denotes a PS TN interface that transmits and receives signaling signals such as dial signals, billing information, and password information, as well as transmitting and receiving information to and from the public network 1.
- 9 2 transmits the information from the public network 1 to the wireless base stations 11 and 13 that constitute the cell where the mobile station of the destination is located, and from the mobile station via the wireless base stations 11 and 13 This is a call path switching unit that sends the information that has been sent to the public network 1.
- 93 is a system setting processor that selects a radio system for connecting the radio base stations 11 and 13 and the mobile station and instructs the radio base stations 11 and 13 and the mobile station to set it.
- 9 5 includes information to be transmitted to the mobile station via the radio base stations 11 and 13, signaling information to and from the mobile station, and method information for defining the radio connection, etc., to each of the radio base stations 11 and 13. It is a base station for communication.
- Reference numeral 96 denotes a data number management processor for allocating serial numbers to the radio wave information transmitted from the two radio base stations 11 and 13 in frame units or bucket units at the same time as the start of the handover process.
- the numbering function provided by this data management processor 96 is This is a new function of this mobile switching center considering the bar.
- Reference numeral 97 denotes a high-speed data memory device that temporarily stores high-speed data transmitted and received between the mobile station and the database 2 when the mobile station connects to the database 2.
- FIG. 4 shows a case where one frame length is set to 10 ms, and the mobile station 16 shown in FIG. 1 performs a handover from the switching source base station 11 to the switching destination base station 13.
- the frame 72 containing the information to be communicated by the mobile station 16 is included in the radio wave transmitted by the switching source base station 11.
- 16 shows a case where the time is later than the frame 71 which contains the information to be communicated.As an example, the difference between the two radio wave frames is two frames in time. There is a case where there is. In practice, it is unlikely that such a large time delay occurs between the two radio base stations 11 and 13 connected to one mobile switching center 6. For simplicity, such a case is mentioned as an example.
- the mobile switching center 6 uses the data number management processor 96 shown in FIG. 5 to add the serial number shown in FIG. 4 to the information of the radio waves transmitted from the radio base stations 11 and 13. Is assigned to each frame, and numbering is performed at the same time as the start of a handover process.
- the serial number included in the information of the signal transmitted from the mobile switching center 6 to the radio base stations 11 and 13 is repeatedly set, for example, for each multi-frame number of the radio channel or an integral multiple thereof.
- the mobile station 16 receives the radio waves (71 and 72) arriving from these two radio base stations 11 and 13 and obtains the information of the time slot. It decodes the serial number assigned to each frame included in the information to detect the time difference between the arrival of the two pieces of information.
- the mobile station 16 receiving the two radio waves from the radio base station 11 and the radio base station 13 switches to the new radio wave 72 simultaneously with the handover one command.
- the change in the serial number included in the information of the signal received by the mobile station 16 before and after the switching is shown in the corresponding frame 73 of the radio wave received by the mobile station at the time of handover in FIG. 4. It will be. In this case, since the sequence numbers 84 and 85 are received twice each, the second received 84 B and 85 B signals must be discarded.
- a command called a repetition code is output in the repetition code grant period 74 and the discarding is performed.
- the repetition code is information on the difference between the serial numbers included in the time-slot information of the two radio waves received by the mobile station 16 from the switching source base station 11 and the switching destination base station 13.
- the repetition code is a negative number.
- the mobile station 16 transfers such a repetition code to the mobile switching center 6 via the switching source base station 11 during communication.
- the reception by this repetition code is performed.
- the discarding of the signal is executed in the mobile station 16, and information that the discarding has been executed is sent to the mobile switching center 6 via the new switching destination base station 13.
- the notified mobile switching center M6 switches the route from the radio base station 11 to 13, the transmission / reception of the communication channel used by the radio base station 11 is stopped, and the communication channel of the radio base station 13 is stopped. Is used for communication with mobile station 16. As a result, the handover process in the above case is Ends.
- the mobile switching center (MS C) in the first embodiment uses an asynchronous transfer mode (hereinafter referred to as “ATM”) type switch, and a radio base station (MSC).
- ATM asynchronous transfer mode
- MSC radio base station
- D emu an ATM demultiplexer
- ltiplexer can accomplish the above purpose if it is configured to decrypt the header.
- the number of bits per packet of an ATM system packet (public network packet) transmitted over a public network (PSTN) is the number of bits included in one frame of a mobile communication system in a wireless section. If the number is larger than the number, the radio base station shall divide the bits of the public network packet and transmit it in accordance with the radio frame. For example, if the number of bits in one PSTN packet is 384 bits and the number of bits per frame in the wireless section is 128 bits, the number of bucket bits is set to It is assumed that it is divided into three and assigned to the radio section frame bit. At that time, the numbering of the divided bits shall have the function of the radio base station.
- Fig. 6 shows the correspondence between the structure of this public network bucket and the structure of the wireless channel.
- 101 is a public network packet number header
- 102 is its ATM bucket information
- 103a is the first information part of the ATM packet information divided into three
- 100 3b is the second information part of the ATM packet information divided into three
- 103c is the third information part of the ATM packet information divided into three.
- the number header 101 of the public network packet is a number added by the ATM type mobile switching center 6.
- 104 is the radio control channel of the first frame of the radio channel
- 1 05 is the radio transmission information
- 106 is the radio control channel of the second frame
- 107 is the radio transmission information
- 108 is the radio control channel of the third frame
- 109 is the radio control channel of the third frame. This is wireless transmission information.
- the radio control channel 104 includes a control information portion and a number portion of the radio section, and the number portion indicates the first number added by the ATM type mobile switching center 6.
- the wireless transmission information 105 is a portion in which the first divided information portion 103a of the ATM bucket information is stored.
- the wireless control channel 104 and the wireless transmission information 105 constitute wireless information of the first frame.
- the radio information of the second frame is composed of the radio control channel 106 including the second number added by the mobile switching center 6 of the ATM type and the second information part 1 divided into three.
- the wireless information of the third frame is composed of a wireless control channel 10 including the third number added by the mobile switching center 6 of the ATM type.
- the third information portion 103c divided into 8 and 3 is composed of wireless transmission information 109 storing the third information portion 103c.
- the public network packet is used.
- the mobile switching center has a function of changing the amount of bucket information to be transmitted to the radio base station without dividing the ATM packet information of the ATM.
- the packet is transmitted from the radio base station as a radio wave with the number added. The case of such a high-speed data transmission will be described in detail in a third embodiment later.
- Embodiment 2 As described above, according to Embodiment 1, if the signal of the switching destination base station is slower than the signal of the switching source base station, the number of signals indicated by the content of the repetition code is discarded. Information delay adjustment within the mobile station. This has the effect that the handover operation can be easily performed.
- Embodiment 2
- Embodiment 2 of the present invention contrary to the case of Embodiment 1 described above, a signal from the switching destination base station is faster in time than a signal from the switching source base station. The process for reaching is described.
- FIG. 7 is an explanatory diagram showing an example of an information transmission time difference depending on a transmission path difference between adjacent wireless base stations at the time of a handover in the second embodiment.
- 111 is a frame corresponding to the radio wave of the switching source base station
- 112 is a frame corresponding to the radio wave of the switching destination base station, and 81, 82 for each frame. , 83, 84, ..., 'are given by the mobile switching center.
- Reference numeral 113 denotes a frame corresponding to the received radio wave of the mobile station at the time of handover
- reference numeral 114 denotes a repetition code application period for applying a repetition code. Also in this case, one frame length is shown as 10 ms.
- the serial number of each frame indicated by the information of the corresponding frame 112 of the radio wave of the switching destination base station 13 is the corresponding frame of the radio wave from the switching source base station 11. If the mobile station 16 is received earlier than the sequence number of each frame of the information of 11 1, the mobile station 16 transmits the information of the corresponding frame 1 12 of the radio wave from the switching destination base station 13. Measure how fast the number for each frame is. The information of “the earliest” of the measurement result is transmitted to the mobile switching center 6 via the switching source base station 11. In the example shown in FIG. 7, since it is the earliest, the mobile switching center 6 sets the content to "1" to inform the switching destination base station 13 of this "earliest earliest" information. Contact the repetition code.
- the repetition code is a positive number. 8 B, 85 B, and 86 B in the sequence number of each frame of the corresponding frame of the radio wave from the switching destination base station 13 are only one frame by the content of the repetition code "1". This indicates that the delayed information has been emitted from the switching destination base station 13 since the handover time. Therefore, the mobile station 16 receives the corresponding frame 11 1 of the radio wave from the switching source base station 11 until the handover point, and from the switching destination base station 13 after the handover point. The frame 1 1 2 corresponding to the radio wave is received. For this reason, the switching destination base station 13 has a function of using an internal memory to delay information corresponding to an integer multiple of the frame time by the number indicated by the repetition code.
- the mobile station 16 confirms that this coincides, and transmits the confirmation information to the mobile switching center 6 via the new switching destination base station 13.
- FIG. 8 is a time chart showing a handover process in the second embodiment.
- a process P 1 2 1 indicates that wireless connection communication is being performed between the mobile station 16 and the switching source base station 11 1
- a process P 1 2 2 is performed between the wireless base station 11 1 and the mobile switching station 6. This shows a state in which a wired connection communication is being performed.
- a handover request due to an error rate increase or the like moves from the currently switching base station 11 or via the switching base station 11. Transmitted from station 16 to mobile switching center 6.
- the mobile switching center 6 Upon receiving the handover request, the mobile switching center 6 sends the mobile station 16 to the switching destination base station 13 in process P 125 and the switching source base station 11 in process P 126.
- the wireless information such as the time slot and the spreading code at the switching destination is transmitted to each of the mobile terminals. From this point, the switching destination base station 13 In step P127, transmission of the same signal as the downlink channel of the switching source base station 11 starts via the switching destination channel.
- the mobile switching center 6 simultaneously assigns a serial number to the signals transmitted to the two radio base stations 11 and 13 in frame length units.
- the mobile station 16 receives the above-mentioned sequence number from each of the two radio base stations 11 and 13, and in a process P128, the sequence number transmitted by the two radio base stations 11 and 13 The deviation is measured, and the deviation information is transmitted to the mobile switching center 6 via the communicating radio base station (in this case, the switching source base station 11).
- the number of deviations notified in this process P128 is notified as a repetition code from the mobile switching center 6 to the switching destination base station 13 in the process P129.
- the switching destination base station 13 starts transmission of the signal delayed by that number to the mobile station 16.
- the mobile station 16 confirms in the processes P 13 1 and P 13 2 that the serial numbers of the information contained in the radio wave frames from the above two radio base stations 11 and 13 match, and confirms the confirmation information.
- the mobile switching center 6 transmits a “communication start command” to the switching destination base station 13 in process P 13 3, and the switching destination base station 13 transmits the information in process P 11 4 to the mobile station 16.
- process P 13 5 wireless communication between the mobile station 16 and the switching destination base station 13 is started.
- process P 13 36 the switching between the switching destination base station 13 and the mobile switching station 6 is performed. Wired communication is started.
- process P 13 37 a “radio disconnection command” is transmitted from mobile switching center 6 to switching source base station 11, and in process P 13 38 switching source base station 11 and mobile station 16 Wireless communication with is disconnected.
- the transmission of the switching destination base station is delayed.
- the delay of the signals from the two radio base stations is equal at the mobile station, and there is an effect that the handover operation of the mobile station can be easily performed.
- Embodiment 3 of the present invention a handover bar at the time of high-speed data transmission will be described.
- the aforementioned Japanese Patent Application No. 9-164881 stipulates a mobile communication system capable of high-speed data transmission.
- a mobile communication system that enables handover in the case of high-speed data transmission that also includes this asymmetric communication channel is shown.
- High-speed data transmission can be realized by the TDMA method or the time-division CDMA method, and the time slot # 5 1 — TO / R0, T1 / R1, T1 / R2, T2 shown in FIG. 3, and T7A show a high-speed data communication channel using the TDMA method, and time slot # 52—T7C shows a high-speed data communication channel using the time-division CDMA method.
- the data demodulated by the CDMA spreading code or the data structure before being frequency-spread by the CDMA spreading code is the TDMA method. Therefore, only the example of the high-speed data communication channel by the TDMA method will be described in detail in the following description.
- FIG. 9 shows TDMA high-speed data communication according to Embodiment 3 of the present invention.
- FIG. 4 is an explanatory diagram showing an example of a time slot structure in the frame.
- 141 and 143 are time slots corresponding to the TDMA high-speed data communication # 51 1-T2 shown in Fig. 2, and 142 is a time-division CDMA with low-speed communication.
- Time slot # 4 1 This is a time slot equivalent to R2.
- Time slot 1441 has a time slot length of 625 ⁇ s, and 16 microslots 1441-1 :! One of them (in the case of the drawing, the microslot 144-16) forms a guard time of 39.06 zs.
- Reference numeral 144 denotes a microslot format showing an example of the internal structure of each microslot 144-1-1: 144--15.
- the information portion (INF (ORMAT I ON DATA)
- the mobile switching center (MSC) is of the ATM type and the radio base station can also be an ATM terminal.
- microslot 144-16 is used as the guard time.
- the microslot 1446-1 can be used. 15 or even more microslots 144–14, 144–13,... Can be guard time.
- time slot 142 for low-speed data communication is not mentioned.
- the time slot 144 for high-speed data transmission is shown only for the downlink (Down-1ink), but the same applies to the uplink (Uplink).
- FIG. 10 shows the case where the signal of the switching destination base station is slower than the signal of the switching source base station.
- FIG. 4 is an explanatory diagram showing an example of a microslot structure at the time of a handover of a high-speed TDMA data overnight channel configured based on a packet.
- FIG. 10 shows the downlink TDMA transmitted by the switching source base station (for example, the wireless base station 11 in FIG. 1) that is wirelessly connected to the mobile station when handover starts.
- High-speed bursts 1 4 6 6-1 and 1 4 6-2 and a downlink TDMA high-speed burst 1 4 7 transmitted by the handover destination base station (for example, wireless base station 13 in Fig. 1) 1 1 and 1 47 1 2 are shown.
- the distance between the mobile station and a plurality of adjacent radio base stations is measured based on the synchronization time lag of frame synchronization between base stations
- Handover is determined based on the measurement results. For example, measurement of the synchronization time lag of frame synchronization between base stations is performed by the radio base station at the start time position of the time-division CDMA burst signal received by the mobile station from the radio base station and at the start time position of the time slot.
- the time difference excluding the fixed time difference from the head time position of the time division CDMA burst signal transmitted according to the instruction of the radio base station is used for time division CDMA communication so that the head arrives. Calculate in chip rate units, and judge handover based on the obtained synchronization time lag. Note that such a handover determination function is disclosed in Japanese Patent Application No. 9-191090, filed separately, and a detailed description thereof will be omitted.
- the time slot of the information of the burst 1 4 6—1 transmitted by the switching source base station 11 is composed of 16 micro slots, and the first micro slot number is # 15 Is one.
- the time slot of burst 147-1 information transmitted by the switching destination base station 13 is also composed of 16 microslots, and the first microslot number is # 1449.
- FIG. 10 shows a case where the information number of the switching destination base station 13 is the second latest after the information number of the switching source base station 11.
- the ATM packets transmitted from the mobile switching center 6 in FIG. 1 to the two radio base stations 11 and 13 are transmitted at the same time because the transmission format is asynchronous. Regardless of the case, they did not arrive at the same time.
- one of the two micro cross slots is delayed in one of the cases where it is not such a simple configuration.However, in this case, the purpose is to stipulate what to do when a delay occurs. This is based on the assumptions described above.
- the mobile station that is about to initiate handover (for example, mobile station 16 in FIG. 1) has a burst 1446-1 transmitted by the switching source base station 11 and a switching destination base station 1 Burst 1 4 7—1 transmitted by 3 is received sequentially in the same frame. Then, mobile station 16 recognizes that the microslot numbers at the head of each burst are # 151 and # 149, and that the delay amount of the information is 2 microslots. A repetition code whose content is “2” is generated and transmitted to the mobile switching center 6 via the switching source base station 11.
- the mobile switching center 6 receiving this repetition code recognizes that the information number of the switching destination base station 13 is 2 times slower than the information number of the switching source base station 11 based on the content, and the content is described. Is sent to the mobile station 16 via the switching destination base station 13 via the switching destination base station 13, and is received after switching due to handover 1, the burst 1 4 7 transmitted from the switching destination base station 13 — Instructs to discard the information of the first two microslots of 2. The mobile station 16 that has received this repetition code, since the content is “2”, transmits the microslots from the top of the burst 1 4 7—2 transmitted by the switching destination base station 13 to the second. Discard the cut information.
- the micro slot number of the information received by the mobile station 16 is 0 Of the 16 microslots shown at the bottom of the figure, the microslot numbers are # 164B to # 178, but the microslot numbers are The first two microslots with # 1664B and # 165B are discarded, so the remaining microslots with microslot numbers # 166 to # 1778 Is used in the mobile station 16 as valid information.
- the handover destination (switching base station) is more effective than the signal transmitted by the handover source (switching base station) during high-speed data transmission. If the signal to be transmitted is slower, the mobile station discards the number of microslots indicated by the contents of the repetition code, and thereby the information generated at the time of the handover of high-speed data transmission at one time. This has the effect of avoiding discontinuities in Embodiment 4.
- Embodiment 4 of the present invention contrary to the case of Embodiment 3, the signal from the switching destination base station moves faster than the signal from the switching source base station in time. The process for arriving at the station will be described.
- FIG. 11 is an explanatory view showing an example of a hand-held temporary microslot structure in the fourth embodiment of the present invention.
- Fig. 11 shows the high-speed downlink TDMA burst transmitted by the switching source base station 11 that is wirelessly connected to the mobile station when handover is started.
- downlink TDMA high-speed bursts 147-1 and 147-2 transmitted by the handover destination base station 13.
- the time slot of the information of 1 constitutes the time slot 1 1
- the first micro cross slot number of the 6 micro cross slots The number is # 151, and the first microslot number of the 16 microslots that constitutes the time slot of the burst 1477-1 transmitted by the switching destination base station 13 is shown. Is # 1 5 4
- FIG. 11 shows a case where the information number of the switching source base station 11 is 3 times slower than the information number of the switching destination base station 13.
- the ATM packets transmitted from the mobile switching center 6 in FIG. 1 to the two radio base stations 11 and 13 are transmitted at the same time because their transmission formats are asynchronous. An example of a case where they have not arrived at the same time is shown.
- the mobile station 16 that is about to start handover includes a burst 1 466-1 transmitted by the switching source base station 11 and a burst 1 4 7 transmitted by the switching destination base station 13. -1 and are sequentially received within the same frame. Then, the mobile station 16 recognizes that the microslot numbers at the head of each burst are # 15 1 and # 15 4 and the delay amount of the information is 3 microslots. A repetition code having the content "3" is generated and transmitted to the mobile switching center 6 via the switching source base station 11.
- the mobile switching center 6 that has received the repetition code recognizes that the information number of the switching destination base station 13 is 3rd earlier than the information number of the switching source base station 11 based on the content thereof, and The repetition code having the content “3” is sent to the switching base station 13, and the information of the first three microslots of the burst 1 4 7-2 transmitted by the switching base station 13 is as follows. Instructs to repeat the last three microslot information of the previous frame. The switching destination base station 13 that has received the repetition code stores the memory for the last three micro cross slots of the micro slot information already transmitted because the content is "3".
- the microslot information of the 3rd microslot stored in the memory is used at the beginning, and the information of the microslot of the first 1474-2 is sequentially stored.
- the mobile station 16 that has received the repetition code via the switching base station 13 receives the instruction from the mobile station 16 according to the instruction. ⁇ Receives the information of the card without any special processing.
- the microslot number of the information received by mobile station 16 is the microslot number from # 1666 in the 16 microslots shown at the bottom of Fig. 11.
- the first three micro-slots from # 166 to # 168 are the microslots up to # 180, and the destination base station 13 transmits the previous frame in the previous frame.
- the mobile station 16 uses the received microslot numbers # 166 to # 180 as all valid information, although the transmitted information is transmitted again.
- the signal transmitted by the handover destination (switching destination base station) during high-speed overnight transmission is transmitted by the handover destination (switching source base station). If the target base station retransmits the last micro-slot of the previous frame as many times as indicated by the content of the repetition code, the handover of high-speed data transmission is performed earlier than the signal to be transmitted. There is an effect that the discontinuity of information that occurs sometimes can be avoided.
- Japanese Patent Application No. 9-191090 does not mention high-speed data communication
- the frames of the TDMA system or the time-division CDMA system are the same, and Alternatively, if the frame of the high-speed data communication by the time-division CDMA system is the same as the above-mentioned frame, the system including the high-speed data communication is also the same base station as Japanese Patent Application No. 9-191090.
- An inter-synchronization scheme is applicable.
- the symbol rate of high-speed TDMA data communication is equal to the chip rate of low-speed or high-speed data communication channels by time division CDMA, or a power of two, or a power of two. If there is, synchronization can be equated to high-speed data communication with the same frame synchronization and time-division CDMA.
- the mobile station 16 moves in the direction of the wireless base station 13 so that Consider the case where the need for handover arises.
- the uplink radio waves from mobile station 16 are transmitted by two radio base stations 11 and 13 Since the radio signals are received simultaneously and the two radio base stations 11 and 13 are frame-synchronized, the arrival time difference between the received signals at the two radio base stations 11 and 13 is within the guard time. Error. Therefore, the problem associated with line switching during uplink handover is not the problem of radio wave arrival between mobile station 13 and radio base stations 11 and 13, but the two radio base stations 1 In the asynchronous transmission mode between the mobile switching center 6, the mobile switching center 6 and the mobile switching center 6, the information of the previous frame was delayed, and the mobile switching center 6 It turns out that the problem is that the order of buckets transmitted to 1 may be reversed. In the fifth embodiment, such a problem is solved as follows.
- FIG. 12 is an explanatory diagram showing the structure of an ATM bucket transmitted by the radio base station to the mobile switching center and radio channel information.
- reference numeral 191 denotes uplink time slot information transmitted by the mobile station 16 shown in FIG. 1 to the radio base station 11 or 13; ontrol D ata) and 193 are the information data transmitted by this (Information Data).
- Reference numeral 194 denotes a packet format modified from the time slot information 191, and reference numeral 195 denotes a header of the packet format 194 added by the ATM type radio base station.
- Reference numeral 6 denotes information to be transmitted (Information Data).
- Reference numeral 197 denotes a packet signal transmitted from the mobile switching center to the database, 198 denotes a header added by the ATM type mobile switching center, and 199 denotes ATM packet information to be transmitted. .
- the control data 192 of the time slot information 19 1 is for transmitting control information and the like necessary for the line connection between the mobile station 16 and the wireless base station 11 or 13.
- 9 3 transmits information from the mobile station 16 to the database 2 via the radio base station 11 or 13, the mobile switching center 6, and the public network 1.
- Used to The time slot information 1911 is transformed into a packet format 1994 to be transmitted to the mobile switching center 6 in the radio base station 11 or 13.
- the transformation from the time slot information 1911 to the packet format 1994 is to remove the radio-specific information from the control data 192 of the time slot information 191, and to notify the mobile switching center 6. This information is added.
- the radio base station 11 or 13 is included in the header 195 of the packet format 194 transmitted from the radio base stations 11 and 13 to the mobile switching center 6.
- the received multi-frame number on the radio channel shall be added as a sequence number related to the multi-frame of the radio channel.
- the serial number associated with the multi-frame of the radio channel may be set to be repeated every integer multiple of the multi-frame.
- the mobile switching center 6 checks the multiframe number in the header 1995 of the packet format 1994 received from the two radio base stations 11 and 13 during the handover to know the order of the information.
- the packet signal 197 transformed from the bucket format 194 based on the order is sent to the database 2 via the public network 1.
- the header 198 of the packet signal 197 transmitted by the mobile switching center 6 is a bucket header specified in the public network 1.
- the header 1995 of the bucket format 194 transmitted from the radio base stations 11 and 13 to the mobile switching center 6 is used only in a closed system in the mobile communication system.
- the structure of the packet signal 197 used in the public network 1 may be different from that of the header 198 of the packet signal 197. That is, in the above-described example, a multi-frame number of information is added.
- the information data 1993 and 196 and the ATM packet information 199 are included therein. Needless to say, there is no need to change the contents.
- Embodiment 5 by adding the multi-frame number on the radio channel to the bucket header transmitted from the radio base station to the mobile switching center, the order of the signals transmitted by the mobile station can be determined. This makes it possible to identify at the mobile switching center, which has the effect of preventing the order of information transmitted from the mobile switching center to the public network from being mistaken during handover.
- Embodiment 6 by adding the multi-frame number on the radio channel to the bucket header transmitted from the radio base station to the mobile switching center, the order of the signals transmitted by the mobile station can be determined. This makes it possible to identify at the mobile switching center, which has the effect of preventing the order of information transmitted from the mobile switching center to the public network from being mistaken during handover.
- Embodiment 6 of the present invention a structure of a mobile station for TDMA / time division CDMA / high-speed TDMAZ high-speed time-division CDMA communication system will be described.
- FIG. 13 is a block diagram showing a configuration of such a mobile station according to Embodiment 6 of the present invention.
- reference numeral 201 denotes an antenna
- reference numeral 202 denotes a transmission / reception distribution unit for distributing a signal received by the antenna 201 and a signal transmitted from the antenna 201
- reference numeral 203 denotes an antenna 210.
- An RF (Radio Frequency) receiver for amplifying the signal received in 1
- a receiver 204 for amplifying a signal transmitted from the antenna 201: an RF transmitter.
- the RF receiver 203 has a built-in switch for selecting a method to be transmitted, that is, a communication method capable of transmitting a required amount of information in synchronization with a time slot. The output destination is switched according to.
- Reference numeral 205 denotes a high-speed and low-speed equalizer that removes delay propagation distortion caused by a propagation path, and when a low-speed TDMA or high-speed TDMA channel is used, the signal selected and output by the RF receiver 203 is output.
- a high-speed / low-speed equalizer / demodulator for demodulation. 206 is spread-coded using a spread-coded signal. When using a time-division CDMA channel, select the RF receiver 203. • Multiply the output signal by the spreading code assigned to its own station (decoding operation) and do not perform spreading coding.
- a correlation reception / despreading coding operation unit that extracts the original signal (correlation reception) and outputs it to the high-speed / low-speed equalization demodulator 205.
- the reference numeral 207 extracts a necessary signal from the format of the signal demodulated by the high-speed / low-speed equalizer / demodulator 205 (demultiplexing) and supplies the signal to the processing section of the channel. CH reception / TDMA separation unit).
- Reference numeral 208 denotes a man-machine which corrects an error in the information demultiplexed by the CH reception / T-DMA separation unit 207, decodes the data and decodes the audio signal from the information, and omits the illustration.
- the error correction / speech decoding unit that supplies this interface.
- Reference numeral 209 denotes an error correction / speech encoding unit that encodes a data signal or a speech signal supplied from a man-machine interface and adds a code for error correction thereto.
- 210 decodes the control data demultiplexed by the CH reception / T DMA demultiplexer 207, instructs the mobile station to perform various functions based on the control data, and controls the response data to the mobile station. This is the control processor that generates.
- the CH transmission / T DMA multiplexing unit 211 multiplexes the data and speech signal error-corrected and coded by the error correction / voice coding unit 209 with the control data from the control information processor 210, and A channel transmission / TDMA multiplexing unit (hereinafter, referred to as a CH transmission / TDMA multiplexing unit) that outputs the multiplexed information in a required time slot.
- the CH transmission / T DMA multiplexing unit 211 has a built-in switch for selecting a transmission method, that is, a communication method capable of transmitting a required amount of information in synchronization with a time slot. The output destination is switched according to the communication method.
- 2 1 2 is C when using low-speed TDMA or high-speed TDMA channels.
- the modulator 213 The information output from the CH transmission / TDMA multiplexing unit 211 is spread and coded on the frequency axis using the spreading code assigned to its own station, and the correlation is input to the modulator 211 It is an encoding / spreading encoding operation unit.
- Time measurement unit. 2 15 is burst control / time setting within frame ⁇
- Time measurement unit 2 14 is a chip rate used for time measurement and a spreading code generator that generates a spreading code assigned to its own station. It is a vessel.
- a storage means 216 stores the information contained in the time slot or the high-speed data as the information of the micro slot in the time slot, which has been demultiplexed by the CH reception / TDMA separation section 207. It is a buffer and a memory. Reference numeral 217 stores the number corresponding to the contents of the repetition code transferred from the control information processor 210 which has received the control data demultiplexed by the CH reception / TDMA separation unit 207. It is a frame synchronization control processor as a control means that instructs the data buffer and memory 216 to discard information.
- the mobile station shown in FIG. 13 can achieve a handover on a mobile communication system having an asymmetric communication channel.
- the TDMA method is used for large-capacity transmission in the downlink.
- the high-frequency signal of the TDMA high-speed data channel input from the antenna 201 is input to the RF reception unit 203 via the transmission / reception distribution unit 202, and the high-speed signal with an equalizer is provided.
- the signal After being converted into a digital signal by the low-speed equalizer / demodulator 205, the signal is demultiplexed into control information and high-speed data information by the CH reception / TDMA separation unit 207.
- the demultiplexed control information is passed to the control information processor 210, and the high-speed data is passed to the data buffer memory 216.
- the control information passed to the control information processor 210 performs handover switching at what number frame in the multiframe.
- the control information processor 210 transmits the information indicating whether or not to perform the repetition code, and the control information processor 210 transfers the information to the frame synchronization control processor 217.
- the frame synchronization control processor 217 transfers the data to the data memory and the PF memory 216 so that the information of the head micro-cross unit of the frame is discarded by the number specified by the repetition code at the time of the switching frame number. Command.
- the remaining information is supplied from the buffer memory 216 to the error correction / speech decoding unit 208, and the error-corrected information is output to the interface of the man-machine.
- the handover processing in the uplink is performed between the mobile station and the radio base station. There is no particular problem, and no special processing is required at the mobile station. Therefore, the case where the uplink is low-speed data will be described here with reference to FIG.
- Low speed input from data source (man's machine interface)
- the data is subjected to processing such as error correction in an error correction / speech coding unit 209, and is transmitted to a control information processor 2 in a CH transmission / TDMA multiplexing unit 211.
- the multiplexed signal is CDMA-coded by a correlation coding / spreading coding calculation unit 2 13 and a modulator 2 1 2 and an RF transmission unit are used.
- the mobile station used in the mobile radio system performs a handover
- the mobile station having the function of deleting the downlink data is used.
- the mobile station only needs to set the buffer memory 216 and the frame synchronization control processor 217 that controls it, and the mobile station, for the uplink, sets the base station radio parameters (frequency, Other than switching to a time slot, etc., there is an effect that it is not necessary to pay special attention to handover for data delay etc.
- a structure of a wireless base station for a TDMA / time-division CDMA / high-speed TDMA / high-speed time-division CDMA communication system will be described.
- FIG. 14 shows such a wireless communication according to Embodiment 7 of the present invention.
- FIG. 3 is a block diagram illustrating a configuration of a base station.
- reference numerals 2 2 1 and 2 2 2 denote an antenna 201, a transmission / reception distribution unit 202, an RF reception unit 203, an RF transmission unit 204, and a data buffer from the mobile station shown in FIG.
- This is a signal processing unit having the same functions as those except for one memory 2 16 and the frame synchronization control processor 2 17.
- 2 2 3 and 2 2 4 are adders for adding signals output from a plurality of signal processing units including the signal processing unit 2 2 1 and 2 2 2, 2 2 5 is an RF transmission unit, 2 26 is an RF receiver, 2 27 is a transmitter / receiver distributor, and 2 28 is an antenna.
- 231-238 and 241-248 are channel assignments as storage means for storing information included in the time slot or information of the micro slot during the time slot.
- Memory 2 3 1, 2 3 5, 2 4 1, 2 4 5 are for time division CDMA channel conversion
- Memory 2 3 2, 2 3 6, 2 4 2, 2 4 6 are low speed
- memories 2 3 3, 2 3 7, 2 4 3, 2 4 7 are used for high-speed TDMA / high-speed time division CDMA data channel conversion
- memory 2 3 4, 2 3 8, 2 4 4 248 are respectively used for TDMA / time division CDMA control channel conversion.
- the conversion directions of these memories 2 3 1 to 2 3 4 and 2 4 1 to 2 4 4 and memories 2 3 5 to 2 3 8 and 2 4 5 to 2 4 8 are opposite to each other. Has become.
- 2 5 1 selects one of the memories 2 3 1 to 2 3 4
- 2 2 1 is a switch connected to the information input to select the system to be transmitted, that is, the communication system that can transmit the required amount of information, in synchronization with the time slot.
- reference numeral 253 denotes a switch for selecting one of the memories 241-1 to 2444 and connecting to the information input of the signal processing section 222 for selecting a communication system.
- Reference numeral 54 denotes a switch for selecting a communication method for connecting the information input of the signal processing section 222 to one selected from the memories 245 to 248.
- a frame synchronization processor as a control means that retransmits the stored information and controls the memories 235 to 238 to add a new header including a serial number to the received information.
- 25 6 controls the memories 24 1 to 24 4 to store the information already transmitted by the number specified by the contents of the repetition code received from the mobile switching center 6, and at the start of handover Retransmit the stored information and control the memory 245 to 248 to add a new header including the serial number to the received information.
- Frame synchronization as control means Processor.
- Reference numeral 257 denotes an exchange interface for taking an interface between the radio base station and the mobile exchange 6.
- FIG. 15 is a block diagram showing the internal configuration of the signal processing sections 22 1 and 22 2.
- 260 is an error correction / speech coding section
- 26 1 Is the CH transmission / TDMA multiplexing section
- 262 is the modulator
- 263 is the correlation coding / spreading coding calculation section
- 264 is the burst control / frame time setting and time measurement section
- 2 6 5 is a spread code generator and chip rate generator
- 2 6 6 is a high-speed / low-speed equalizer / demodulator
- 2 6 7 is a correlation reception / de-spread coding operation unit
- 2 6 6 is a CH reception / TDMA demultiplexing unit.
- 269 are error correction / speech decoding units, which are equivalent to the corresponding parts shown in FIG.
- each of the units 260 to 269 in the signal processing units 22 1 and 22 2 whose internal configuration is shown in FIG. 15 is shown in FIG. Since it is the same as that of each unit 205 to 209 and 211 to 215 in the mobile station, the description is omitted here.
- FIG. 7 shows an example of the information arrival time difference depending on the transmission path difference when the signal transmitted by the switching destination base station is earlier than the signal of the switching source base station.
- the frame synchronization control processor 255 shown in FIG. 14 controls the memories 231 to 234 to correspond to the frame corresponding to the transmission radio wave of the switching destination base station shown in FIG. As shown by 112, at the time of handover, the information of the time slot to which the sequence number 84 is assigned is transmitted to the mobile station again.
- the frame synchronization control processor 255 based on the content of the repetition code “1” received from the mobile switching center 6 via the switching interface 250 7, converts the time division CDMA channel.
- Information for one time slot is stored in the data memory 2 3 1 or the memory 2 3 2 for low-speed TDMA data channel conversion, and after handover, the information is output to the information input of the signal processing unit 2 21.
- the signal processing unit 221 processes the received information by the same operation as that of the mobile station shown in Fig. 13 and processes it by the adder 223, the RF transmission unit 225, the transmission / reception distribution unit.
- the signals are sequentially transmitted as radio waves via the antenna 227 and the antenna 238.
- the frame synchronization control processor 255 based on the content of the repeat code "3" received from the mobile switching center 6 via the switching interface 255, provides a high-speed TDMA data channel.
- the information for three micro cross-lots is stored in the conversion memory 233, and after the handover, the information is output to the information input of the signal processing unit 221 to be processed by the signal processing unit 221.
- Adder 2 2 3, RF transmitter 2 2 5, Transmitter / receiver distributor 2 2 7 And sequentially transmitted as radio waves via the antennas 228.
- the header of the packet type information transmitted to the mobile switching center 6 includes the frame number in the multiframe. It is necessary to add a new header that contains the information. This new header addition work is performed by the frame synchronization control processors 255 and 256 shown in FIG. 14, and is controlled by the memories 235-223 or 245-24-2. 8
- FIG. 16 is a system configuration diagram showing an overall configuration diagram of such a mobile communication system according to Embodiment 8 of the present invention. The corresponding parts are denoted by the same reference numerals as in FIG. Omitted.
- 27 1 is an additional communication line installed between the mobile switching center 6 and the mobile switching center 7 to directly connect them
- 27 2 is a communication line between the mobile switching center 7 and the mobile switching center 8.
- the additional communication lines 27 1 and 27 2 are provided between the mobile switching center 6 and the mobile switching center 7, for example. This is used when handover is performed between radio base stations belonging to different mobile switching centers, such as radio base station 21 belonging to a mobile switching center.
- switching source base station 13 becomes The connection between the connected mobile switching center (hereinafter referred to as “switching mobile switching center”) 6 and the mobile switching center to which the switching destination base station 21 is connected (hereinafter referred to as “switching mobile switching center”) 7
- switching mobile switching center The directly connected additional communication line 271 is specifically used as follows.
- the switching source mobile switching center 6 When the mobile station 18 approaches the switching destination base station 21, the switching source mobile switching center 6 needs to hand over the communication partner of the mobile station 18 from the switching source base station 13 to the switching destination base station 21. Is determined to have occurred.
- the other party on the public network side in this communication is the database 2, and it is assumed that the information is connected via the switching centers 3 and 5 belonging to the public network 1. I do.
- the switching source mobile switching center 6 switches to the switching destination mobile switching station 7 to which the handover destination radio base station 21 is connected. It will be common to transfer the relay function.
- connection before the handover starts from the database 2 and switches to the exchange 5 belonging to the public network 1
- the mobile station 18 is reached via the station 3, the switching source mobile switching center 6, and the switching source base station 13.
- connection after the handover starts from database 2 and switches to mobile station 18 via switching station 5, switching station 4, switching destination mobile switching station 7, switching destination base station 21 belonging to the public network. Will be reached.
- the eighth embodiment when a handover occurs, starting from database 2, switching station 5, switching station 4, switching destination mobile switching station 7, switching destination mobile switching station 7 belonging to public network 1 Rather than immediately moving to the above-mentioned final form of arriving at mobile station 18 via base station 2 1, departure from base 2 and switching stations 5 and 3 belonging to public network 1 First, a transition is made to an intermediate form of reaching the mobile station 18 via the switching source mobile switching center 6, the switching destination mobile switching station 7, and the switching destination base station 21. In this case, transmission of information from the switching source mobile switching center 6 to the switching destination mobile switching center 7 is performed via the additional communication line 27 1.
- this handover is caused by the operating system to which the switching originating mobile switching center 6 and the switching destination mobile switching center 7 belong (usually, the operator who owns the system that provides the mobile communication service is referred to as the operator). ).
- the contact point for the mobile station side of the public network 1 is the mobile switching center 6 both before and after the handover, so that the public network 1 and the data base 2 perform the handover. You do not need to be conscious.
- the radio base station to which the switching mobile switching center 6 is connected is connected. If the destination information of the additional header (101 in Fig. 6) of the packet to be transmitted to the switching base station 13 is changed from the switching source base station 13 to the switching destination base station 21, this packet will become an additional communication line. 2 7 1 and the switching destination mobile switching exchange so that it reaches the switching destination base station 21 via the exchange 7. It is possible to set the exchange 6 and the switching destination mobile exchange 7.
- connection between the public network 1 and the mobile station 18 performed in an intermediate form via the switching source mobile switching center 6, the additional communication line 271, the switching destination mobile switching station 7, and the switching destination base station 21.
- the mobile station 1 8 is switched via the switching destination base station 21 and the switching destination mobile switching center 7 instead of returning to the intermediate format again. Communication with the public network 1 may be performed.
- the handover from the switching source base station 13 belonging to the switching mobile switching center 6 to the radio base station 21 belonging to the mobile switching center 7 and the handover to the radio base station 31 belonging to the mobile switching center 8 are further performed. If the cleared mobile station 18 is still communicating after the handover, the information from the switching destination base station 31 currently communicating with the mobile station 18 is transmitted to the switching destination base station 3 1 From the switching destination mobile switching center 8 to which it belongs, to the switching source mobile switching center 6 via the additional communication line 2 7 2, the mobile switching center 7, and the additional communication line 2 7 1 Transmission from 6 to the public network 1 is performed.
- the eighth embodiment by setting the additional communication line directly connecting the mobile switching centers and the header for passing through the mobile switching center, the occurrence of a handover can be achieved.
- the communication between the mobile station and the radio base station is performed by the FDMA / TDD system, the multi-carrier TDMA system using the communication channel modulated by the digital modulation system.
- Wirelessly connected by the TDM, CDM A / TDD, or time division CDMA method, etc. and has a time slot sharing with the TDMA signal and a frequency channel sharing (including non-frequency sharing) time division CDMA signal. It is effective for controlling the handover of mobile stations in a mobile communication system sharing time slots with a mobile switching center having a control function of allocating signals on the time axis and the frequency axis. Further, the mobile communication system in which a mobile station having a high-speed data transmission function and a radio base station are wirelessly connected by a high-speed data transmission channel. In, it is effectively used in Han De-over first control.
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002267367A CA2267367C (en) | 1997-09-30 | 1997-09-30 | Mobile station with down-link frame numbering |
EP97941288A EP0969612A4 (en) | 1997-09-30 | 1997-09-30 | MOBILE TRANSMISSION SYSTEM |
PCT/JP1997/003492 WO1999017469A1 (fr) | 1997-09-30 | 1997-09-30 | Systeme de communication mobile |
US09/254,872 US6532364B1 (en) | 1997-09-30 | 1997-09-30 | Mobile communication system with down-link frame numbering |
JP51600799A JP3207444B2 (ja) | 1997-09-30 | 1997-09-30 | 移動通信システム |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1997/003492 WO1999017469A1 (fr) | 1997-09-30 | 1997-09-30 | Systeme de communication mobile |
Publications (1)
Publication Number | Publication Date |
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WO1999017469A1 true WO1999017469A1 (fr) | 1999-04-08 |
Family
ID=14181226
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/003492 WO1999017469A1 (fr) | 1997-09-30 | 1997-09-30 | Systeme de communication mobile |
Country Status (5)
Country | Link |
---|---|
US (1) | US6532364B1 (ja) |
EP (1) | EP0969612A4 (ja) |
JP (1) | JP3207444B2 (ja) |
CA (1) | CA2267367C (ja) |
WO (1) | WO1999017469A1 (ja) |
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US8085728B2 (en) | 2002-04-05 | 2011-12-27 | Interdigital Technology Corporation | High speed downlink shared control channel cell change |
US8130721B2 (en) | 2002-04-05 | 2012-03-06 | Interdigital Technology Corporation | HS-DSCH inter-node B cell change |
US8085729B2 (en) | 2002-04-05 | 2011-12-27 | Interdigital Technology Corporation | High speed downlink shared control channel cell change |
US8085726B2 (en) | 2002-04-05 | 2011-12-27 | Interdigital Technology Corporation | High speed downlink shared channel cell change |
JP2009278637A (ja) * | 2002-09-12 | 2009-11-26 | Interdigital Technol Corp | Mac層リセット後にノードbバッファデータを効率的に回復するためのシステム |
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JP2008035557A (ja) * | 2002-09-12 | 2008-02-14 | Interdigital Technol Corp | Mac層リセット後にノードbバッファデータを効率的に回復するためのシステム |
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JP2008541506A (ja) * | 2005-05-02 | 2008-11-20 | モトローラ・インコーポレイテッド | データを送信する方法および装置 |
US8855123B2 (en) | 2009-01-09 | 2014-10-07 | Nec Corporation | Gateway apparatus, method and system |
CN114389762A (zh) * | 2021-12-29 | 2022-04-22 | 成都中科信息技术有限公司 | 一种针对数字同传系统的双链路数据切换处理方法 |
CN114389762B (zh) * | 2021-12-29 | 2023-07-21 | 成都中科信息技术有限公司 | 一种针对数字同传系统的双链路数据切换处理方法 |
Also Published As
Publication number | Publication date |
---|---|
CA2267367A1 (en) | 1999-04-08 |
EP0969612A1 (en) | 2000-01-05 |
EP0969612A4 (en) | 2006-05-10 |
US6532364B1 (en) | 2003-03-11 |
CA2267367C (en) | 2002-07-30 |
JP3207444B2 (ja) | 2001-09-10 |
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