WO2000025539A1 - Selection d'une ligne de communication et dispositif de communication mobile - Google Patents
Selection d'une ligne de communication et dispositif de communication mobile Download PDFInfo
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- WO2000025539A1 WO2000025539A1 PCT/JP1998/004839 JP9804839W WO0025539A1 WO 2000025539 A1 WO2000025539 A1 WO 2000025539A1 JP 9804839 W JP9804839 W JP 9804839W WO 0025539 A1 WO0025539 A1 WO 0025539A1
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- Prior art keywords
- line
- identification information
- communication
- communication line
- unit
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18558—Arrangements for managing communications, i.e. for setting up, maintaining or releasing a call between stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
Definitions
- the present invention relates to a communication line selection method and a mobile communication device, and more particularly, to an improved communication line selection method for selecting any one of a plurality of wireless communication lines provided by a system, and a system.
- the present invention relates to an improvement of a mobile communication device for selecting any one of a plurality of wireless communication lines provided by a system.
- a mobile communication device such as a mobile phone can generally use a plurality of wireless communication lines provided by a communication system, it is provided with a line selection unit for selecting a communication line. Communication is in progress.
- the line selection unit determines a communication line, it sequentially selects selectable communication lines and finds a usable communication line, that is, a line that can receive a radio signal from the system side. A search is needed.
- the communication line In the case of a TDMA (Time Division Multiple Access) type mobile phone, the communication line is specified by frequency and time slot. In the case of a CDMA (Code Division Multiple Access) type mobile phone, the communication line is It is specified by frequency and spreading code. For example, Ding 0 1 ⁇ 1 method 6 5 1 ⁇ 1 (Grobal System If the system adopts the system of “Mobile communications”, several hundred kinds of communication lines can be selected by the combination of frequency and time slot.
- TDMA Time Division Multiple Access
- CDMA Code Division Multiple Access
- communication lines are sequentially selected from a line list that specifies selectable communication lines, and the line state is checked (line search). If it finds a communication line with a good line condition, it captures that communication line. Thereafter, if the line condition of this communication line deteriorates, a similar line search is performed again. In such a line search, a communication line is sequentially selected from the line list.Therefore, it may be possible to find a communication line having a good line state by one line check, but it is necessary to perform several hundred line checks. In some cases, it is possible to find a good communication line for the first time.
- the time required for the line state check operation varies depending on the communication method. However, in the case of the communication method requiring a long time for this check operation, the time required for the line search may be up to several seconds to several tens of seconds. If the time required for the line search becomes longer, there is a problem that a user may not be able to use the wireless communication device immediately even in the service area where the wireless signal from the system can be received.
- the line list of this mobile phone is a communication line (home line) provided by a service company to which the user has directly contracted, and a communication line provided by another service company. It consists of a communication line (roaming line) that can be used by the user.
- the home line and the mouthing line are grouped and stored. Then, during the line search, selection is made preferentially from the group of home lines, and only when the line condition of all the home lines is not good, selection is made from the group of mouthing lines.
- the home line Since the line usage fee is cheaper, this mobile phone groups communication lines in the line list for economic reasons.
- the line switching search time can be reduced in the area where the home line can be captured, but outside the area, only the roaming line can be captured and the line search takes a long time.
- a system for example, a ground station
- the channel information of a radio signal (a cell corresponding to this radio signal is referred to as a serving cell) from a ground station monitored by a mobile communication device includes a cell adjacent to the serving cell. (Neighboring cell) frequency information is included. If the frequency information of such a Neino's ring cell is acquired in advance, when the mobile communication device leaves the serving area, a line search is performed only for these communication lines, The next communication line can be captured from a short line search.
- one ground station generally provides a plurality of adjacent cells, but each neighbor cell in the GSM scheme is simply a cell adjacent to the current serving cell.
- the terrestrial station providing each neighbor cell is not necessarily the same as the terrestrial station providing the serving cell. Therefore, the ground station that provides the new serving cell selected as a result of the circuit search may be different from the ground station that previously provided the serving cell.
- a method for selecting a communication line includes a detecting step of detecting a line state of a communication line, an extracting step of extracting identification information of a system-side communication device that provides the communication line, for example, a ground station or a communication satellite.
- a mobile communication device includes a line monitoring unit that detects a line state of a communication line, and a system-side communication device that provides the communication line, for example, an identification information extraction unit that extracts identification information of a ground station or a communication satellite.
- An identification information storage unit that stores the identification information extracted by the identification information extraction unit in association with the communication line based on the detection result of the line monitoring unit; and based on the identification information stored in the identification information storage unit.
- Select communication line And a line selection unit that performs the operation. For this reason, the communication line provided by the same system-side communication device can be preferentially selected at the time of line switching.
- FIG. 1 is a block diagram showing a configuration example of a mobile communication device according to the present invention (Embodiment 1).
- FIG. 2 is a diagram showing an example of data constituting the circuit list 7 shown in FIG.
- FIG. 3 are diagrams each showing an example of data constituting the identification information storage unit 4 shown in FIG.
- S100 to S109 in FIG. 4 are flowcharts showing an example of the operation of the mobile communication device shown in FIG. 1, and show the operation at the time of line switching.
- FIG. 5 is a schematic diagram showing a system configuration example including a mobile communication device according to the present invention.
- FIG. 6 is a block diagram showing another configuration example of the mobile communication device according to the present invention (Embodiment 2).
- FIG. 7 is a diagram showing an example of data constituting the circuit list 7 shown in FIG.
- S200 to S204 in FIG. 8 are flowcharts illustrating an example of the operation of the mobile communication device illustrated in FIG. 6, and illustrate operations performed between wireless signal monitors during standby.
- FIG. 9 is a schematic diagram showing another configuration example of the system including the mobile communication device according to the present invention (Embodiment 3).
- FIG. 10 is a diagram showing another example of data constituting the line list 7 shown in FIG. 6 (Embodiment 4).
- S 300 to S 314 in FIG. 11 correspond to the mobile communication device shown in FIG. 9 is a flowchart showing another example of the operation.
- FIG. 1 is a block diagram showing a configuration example of a mobile communication device MS according to the present invention.
- 1 is an antenna unit for receiving a radio signal from a communication device on the system side (not shown)
- 2 is an identification information extracting unit for extracting identification information of the communication device on the system side from the received signal
- 3 is a line of a communication line.
- 4 is an identification information storage unit that stores extracted identification information
- 5 is an identification information writing unit that writes identification information to the identification information storage unit 4
- 6 is an identification information storage unit.
- An identification information search unit for performing data search 7 is a line list in which selectable communication lines are specified in advance, and 8 is a line selection unit for selecting a communication line from the line list 7.
- the line list 7 is a storage unit that stores information on communication lines that can be selected by the mobile communication device MS, and can be realized by a nonvolatile storage unit such as a ROM, an EPROM, or a flash memory. Also, it can be realized as a volatile storage means such as a DRAM, a SRAM or the like in which line information is copied as necessary from a non-volatile storage means such as a hard disk, an optical disk, a ROM, an EPROM, a flash memory. it can.
- FIG. 2 is a diagram showing an example of data constituting the circuit list 7. Here, a case will be described in which the present invention is applied to a TDMA type mobile phone as an example of the mobile communication device MS.
- Line list 7 contains hundreds of types of communication that can be selected by a combination of radio signal carrier frequencies F1, F2, F3, ... and time slots T1, T2, T3, ... indicating synchronization timing. The line is specified.
- the line selector 8 generates an address signal for the line list 7, selects a communication line, and reads out its frequency and time slot. Reading The output frequency and time slot are sent to the line monitoring unit 3, and the line monitoring unit 3 detects the line state. This detection result is binary data or multi-valued data indicating pass / fail. If the detected line condition does not reach the predetermined quality level, the line selection unit 8 switches the line list 7 from the line list 7 to another communication line. Select
- the identification information extraction unit 2 extracts identification information of the communication device on the system side from a reception signal received at the time of standby via a standby line, a broadcast line, or the like.
- the system-side communication device refers to a system-side communication device that provides a communication line to the mobile communication device MS.
- a ground station and a communication satellite are used.
- a satellite communication system that communicates with a ground station via a satellite, it is a ground station or a communication satellite.
- the radio signal from the communication device on the system side contains channel information.
- One of the channel information is identification information of the communication device on the system side called “Service ID”.
- Service ID identification information of the communication device on the system side
- the identification information extracting unit 2 extracts such identification information from the received signal and outputs the same to the identification information writing unit 5.
- the identification information writing unit 5 writes the identification information extracted from the communication line having a good line state into the identification information storage unit 4 based on the output signals of the identification information extraction unit 2 and the line monitoring unit 3. That is, when the detected line state is equal to or higher than a predetermined quality level (that is, the line state is good), the identification information extracted by the identification information extraction unit 2 is written to the identification information storage unit 4.
- the identification information storage unit 4 is storage means for storing the identification information extracted in the past by the identification information extraction unit 2 in association with the communication line at that time. This can be realized by a volatile storage means such as a DRAM or an SRAM, or a nonvolatile storage means such as a flash memory or an EP ROM.
- FIG. 3 are diagrams illustrating examples of data constituting the identification information storage unit 4, respectively.
- the address in which the communication line is specified in the line list 7 and the address in which the identification information is stored in the identification information storage unit 4 are associated with each other, so that the communication line and the identification information are associated with each other. Is associated.
- the identification information "D 1”
- the communication lines "F 1 & T 1" (address 1), "F 2 & T 4" (address 4) and "F 4 & T 3" (address 12) Associated.
- “-” indicates that the communication line has not been captured in the past and the corresponding identification information has not been obtained.
- the communication line is associated with the identification information by storing the identification information together with the address in the line list 7 defining the communication line.
- the method (b) requires a smaller storage capacity than the method (a).
- the identification information writing unit 5 classifies and writes the data in the identification information storage unit 4 for each identification information. Therefore, when the identification information search unit 6 performs a data search, the data search can be performed at a higher speed.
- the identification information search unit 6 searches for the identification information stored in the identification information storage unit 4. That is, it searches for identification information that matches the identification information specified by the line selection unit 8 and returns the address to the line selection unit 8 if the same identification information exists.
- the line selection unit 8 selects a communication line from the line list 7 using this address. In this way, a communication line can be selected based on the identification information.
- S100 to S109 in FIG. 4 are flowcharts showing an example of the operation of the mobile communication device shown in FIG. 1, and show the operation at the time of line switching.
- FIG. 1 the line state of the communication line used by the line monitoring unit 3 is detected (S100). As a result, if the line condition is good, this process is terminated because line switching is not performed.
- a line search is started (S101 to S108).
- the line selecting unit 8 instructs the identification information searching unit 6 to search for data.
- the identification information search unit 6 searches the identification information storage unit 4 for the same identification information as the identification information of the communication line that has been captured up to now (S101).
- the address corresponding to the identification information is returned to the line selection unit 8 (S102).
- the line selection unit 8 reads out the line information of the communication line selected by this address, that is, the frequency and the time slot from the line list 7 (S103).
- the line monitoring unit 3 detects the line status of the selected communication line based on the read frequency and time slot information (S104). As a result, if the line condition is good, this process is terminated. (S 105). If the line condition is not good, the identification information search unit 6 performs the data search again according to the instruction of the line selection unit 8. Perform (S101). At this time, the data on the searched communication line is excluded from the search target.
- the identification information search unit 6 returns the information of "no corresponding data" to the line selection unit 8.
- the line selection unit 8 repeats the operation of selecting a communication line from the line list 7 in a predetermined order (for example, address order) and detecting the line state until a communication line with a good line state can be found. (S106-S108).
- the identification information writing unit 5 writes the extracted identification information into the identification signal storage unit 4 (S109). ), End line switching process Complete.
- FIG. 5 is a schematic diagram showing a system configuration example including a mobile communication device according to the present invention.
- This system is a terrestrial communication system.
- MS is the mobile communication device shown in Fig. 1
- BS1 and BS2 are ground stations as system-side communication devices in a mobile phone system, and A1 and A2 are respectively.
- This is the radio area covered by ground stations BS 1 and BS 2.
- Each ground station provides two or more different communication lines, and each wireless area A 1, A 2 consists of two or more cells C corresponding to these communication lines. That is, the wireless areas A 1 and A 2 are further subdivided by the cell C.
- the ground stations BS1 and BS2 are system-side communication devices of the mobile communication device MS.
- the line state of the communication line being captured deteriorates. Further, even if the communication line is stationary in the cell C, the line state of the acquired communication line may deteriorate for some reason. At this time, as long as the mobile communication device MS is within the radio area A 1 covered by the ground station B S 1, there is a possibility that it can communicate with the ground station B S 1 by using another communication line.
- the service charges provided by the ground station are different, if the other communication line provided by the same ground station as the ground station that provided the communication line is captured, the same Service. For this reason, it is not necessary to determine for each communication line whether or not the ground station is providing the service desired by the user when the line is switched. For example, there is no need to determine whether a communication line can be connected to the network desired by the user or a communication line with a low charge when switching lines.
- the mobile communication device MS preferentially selects the communication line of the ground station BS1 at the time of line switching, the line switching can be completed in a short time. Can be.
- the time for the line search can be significantly reduced.
- the identification information storage unit 4 may be configured with the same storage means as the line list 7, and the identification information of all the ground stations may be stored in advance in association with the communication lines in the line list 7. In addition, other communication lines provided by the same ground station can be selected. However, since a large number of ground stations are generally installed, a large-capacity memory is required as the identification information storage unit 4 to store the identification information of all the ground stations. In addition, since the amount of data to be searched by the identification information search unit 6 is large, the search time becomes long.
- the identification information of the ground station is extracted from the received signal and stored. That is, the mobile communication device learns information of the base station according to the user's action range. Therefore, it is not necessary to previously store the identification information of the ground station, which is simple.
- the identification information storage unit 4 can be configured with a small-capacity memory. it can. In the present embodiment, an example has been described in which the identification information storage unit 4 and the circuit list 7 are configured as separate storage units, but both may be configured as the same writable storage unit.
- FIG. 6 is a block diagram showing another configuration example of the mobile communication device MS according to the present invention.
- This mobile communication device is configured to further include an adjacent cell information extracting unit 9 in addition to the mobile communication device of FIG.
- channel information of an adjacent neighbor cell is included in channel information of a radio signal from a system-side communication device (eg, a ground station). Used in communication systems.
- the neighbor cell information extraction unit 9 extracts the line information of the neighboring cell from the channel information of the received signal at the time of standby, that is, the frequency and time slot in the TDMA system, and the frequency and spread code in the CDMA system9.
- the line selection unit 8 receives the line information of the Neino's ring cell from the adjacent cell information extraction unit 9 and sequentially sends the line information to the line monitoring unit 3, and the line monitoring unit 3 detects the line state.
- the line monitoring unit 3 monitors a radio signal from the communication device on the system side during standby. That is, the line state of the acquired communication line (the communication line corresponding to the serving cell) is repeatedly detected. During the period of one monitor operation, the line state of the communication line of the neighbor cell specified by the line selection unit 8 is also detected.
- the identification information writing unit 5 writes the extracted identification information into the identification information storage unit 4 based on the output signals of the identification information extraction unit 2 and the line monitoring unit 3. At this time, the line information of the communication line specified by the line selection unit 8 is also written to the identification information storage unit 4. In other words, when the line state of the detected neighboring cell is good, the extracted identification information is written into the identification information storage unit 4 together with the information of the communication line that associates this information. In this case, the detection of the line status is not for detecting the communication line to be captured, but for extracting the identification information of the communication device on the system side, and should be good enough to extract the identification information. It is enough. For this reason, the level of pass / fail judgment may be lower than the judgment at the time of line switching.
- FIG. 7 is a diagram illustrating an example of data constituting the identification information storage unit 4.
- the mobile communication device MS will be described using a TDMA-type mobile phone as an example.
- Each data has frequency F1, F2, F3,..., It consists of a combination of time slots T1, ⁇ 2, ⁇ 3 and identification information D1, D2, D3,..., each of which is a communication line for which a good line condition was detected in the past, It corresponds to one bing cell and a neighbor cell whose line condition was good at that time.
- S200 to S203 in FIG. 8 are flowcharts showing an example of the operation of the mobile communication device MS according to the present invention. This flowchart shows an operation performed between the wireless signal monitors by the line monitoring unit 3 during standby when the communication line is not switched.
- the line selection unit 8 selects one communication line from the communication lines of the neighbor cell extracted by the neighboring cell information extraction unit 9 (S200).
- the line monitoring unit 3 detects the line status of the selected communication line (S 20 ).
- the identification information writing unit 5 transmits the identification information extracted by the identification information extraction unit 2 and the line from the line selection unit 8.
- the information is stored in the identification information storage unit 4 in association with the information (S203).
- This process needs to be performed in the interval between the monitoring of radio signals during standby, so when it is time to monitor radio signals next time or when the user operates the mobile communication terminal (for example, ), The process should be stopped immediately.
- the separate information search unit 6 searches for the identification information stored in the identification information storage unit 4. That is, it searches for identification information that matches the identification information specified by the line selection unit 8, and if the same identification information exists, the line information of the communication line with which the identification information is associated, for example, frequency and time slot. Is read from the identification information storage unit 4 and returned to the line selection unit 8.
- the line selecting unit 8 sends the line information to the line monitoring unit 3, and the line monitoring unit 3 checks the line state. As a result, when the line condition is not good, the operation of the identification information search unit 6 to search for the identification information is repeated. If there is no communication line associated with the same identification information, or if all the associated communication lines are not good, the line selection unit 8 selects communication lines sequentially from the line list 7 and selects a line. The monitoring unit 3 checks the line status. Therefore, if the operation at the time of line switching is shown in the flowchart, it is the same as the flowchart shown in FIG.
- the line state is detected and the identification information is written for the neighbor cell.
- the present invention is applied to a system in which the radio signal from the system-side communication device includes the line information of the neighbor cell, but the radio signal includes information about the neighbor cell.
- the mobile communication device according to the present invention can be applied to a system that does not have such a system.
- the line selection unit 8 sequentially selects communication lines other than the captured communication line based on the line list 7 to detect the line state and extract identification information. .
- FIG. 9 is a schematic diagram showing another configuration example of the system including the mobile communication device according to the present invention.
- Embodiments 1 and 2 describe examples in which the present invention is applied to a terrestrial communication system in which a mobile communication device directly wirelessly communicates with a ground station.
- An example in which the present invention is applied to a satellite communication system that communicates with a ground station will be described.
- MS in the figure is the mobile communication device shown in FIG. 1 or FIG. 6, SS 1 and SS 2 are communication satellites, and BS 1 to BS 3 are ground stations.
- the wireless area (not shown) covered by the communication satellites S S1 and S S2 is composed of two or more cells (not shown) having different communication lines.
- the ground stations BS1 to BS3 are system-side communication devices of the mobile communication device MS.
- the frequency and timing slot of a radio signal from the communication satellite SS 1 s SS 2 to the mobile communication device MS are determined by the ground stations BS 1 to BS 3, and the radio signal includes channel information.
- the radio signal includes channel information.
- identification information of the ground station Therefore, if this identification information is extracted and stored in association with the communication line, the communication line provided by the same ground station can be searched.
- the mobile communication device MS stops or operates at a low speed. There is no significant change in the positional relationship between the ground station and the mobile communication device as long as the mobile station is moving. Therefore, there is a high possibility that different communication lines of the same ground station can be captured.
- the communication satellite SS 1 is a mobile satellite
- the cell position itself moves with the passage of time, so that the line condition deteriorates even if the mobile communication device MS is stationary.
- mobile communication equipment Due to the movement of the mobile station MS the mobile communication apparatus MS may move between cells in the wireless area or may go out of the wireless area, and the line condition may be deteriorated.
- the mobile communication apparatus MS may move between cells in the wireless area or may go out of the wireless area, and the line condition may be deteriorated.
- it if there is no significant change in the positional relationship between the ground station and the mobile communication device, if it moves between cells, it will travel through the same communication satellite SS1, and if it moves out of the wireless area, it will take another communication. In either case, it is highly possible to communicate with the ground station BS 1 via the satellite SS 2.
- the line state may be deteriorated due to a failure of the communication satellite.
- the function of a specific cell of the communication satellite S S1 may be stopped, or all the functions of the communication satellite S S1 may be stopped, thereby deteriorating the line condition.
- a function related to a specific cell is stopped, communication with the ground station BS 1 is performed via the same communication satellite SS 1 if all functions are stopped, and another communication satellite SS 2 if all functions are stopped. It is likely to be possible.
- the communication line can be found by searching for the communication line of the same ground station BS1 regardless of the type of communication satellite.
- the line switching can be completed in a short time.
- the communication satellite SS 1 is a mobile satellite
- Embodiment 3 has described the case where the mobile communication device performs a line search based on the identification information of the ground station in the satellite communication system.
- a case is described in which a mobile communication device performs a channel search based on identification information of a ground station and a communication satellite in a satellite communication system. This will be described with reference to FIGS.
- the communication satellites S S1 and S S2 and the ground stations B S1 to B S3 in FIG. 9 are system-side communication devices.
- a ground station BS1 transmits a radio signal including its own identification information to a communication satellite SS1.
- the communication satellite that has received the radio signal further transmits its own identification information to the mobile communication device MS. That is, the channel information transmitted from the communication satellite S S1 includes the identification information D 1 of the ground station B S1 and the identification information E 1 of the communication satellite S S1.
- the identification information extraction unit 2 in FIG. 6 extracts the identification information of the ground station and the communication satellite from the received signal, and the identification information writing unit 5 associates these identification information with the communication line. To the identification information storage unit 4.
- the radio area covered by the communication satellite S S1 is generally composed of many cells with different communication links. For this reason, when the mobile communication device MS moves or the communication satellite SS 1 as a mobile satellite moves, and the line condition deteriorates, the cause is that the mobile communication device MS The probability of moving from cell to cell in the wireless area is higher than the probability of leaving the wireless area of SS1. That is, when the deterioration of the line condition is detected, the mobile communication device MS often moves only between cells of the same communication satellite SS1, and in such a case, the same communication satellite SS1 is used. It can continue to be used, and there is a high possibility that good line conditions will continue to be obtained.
- FIG. 10 is a diagram showing an example of data constituting the identification information storage unit 4 in FIG. 6, respectively.
- the identification information D1 to D3 of the communication satellite and the identification information E2 to E4 of the ground station are stored in association with the line information of the communication line, that is, the frequency and the time slot.
- This figure shows an example of the TDMA system, and in the case of the CDMA system, it is stored in association with the frequency and the spreading code. Further, as in the case shown in FIG. 3, the identification information of the ground station and the communication satellite may be stored together with the address in the line list 7 so as to be associated with the communication line.
- the identification information search unit 6 searches for the identification information of the ground station that matches the identification information, and when the identification information of the communication satellite is specified, Search the identification information of the communication satellite that matches this.
- the line selection unit 8 first selects the same communication line by the ground station, and then selects the same communication line by the communication satellite. That is, the line selection unit 8 first specifies the identification information of the ground station to the identification information search unit 6 and instructs the identification information search unit 6 to search. As a result, if a communication line with a good line condition cannot be found, then the search instruction is given by specifying the identification information of the communication satellite. Therefore, the same ground station and the same communication satellite are searched in this order.
- S300 to S314 in FIG. 11 are flowcharts showing an example of the operation of the mobile communication device according to the present embodiment.
- a line search is started (S300).
- the line search consists of a line search by ground station (S301 to S305), a line search by communication satellite (S306 to S310), and a sequential line search (S31 to S3). 13) are classified.
- a line search is performed by the ground station.
- the identification information search unit 6 identifies data whose identification information matches that of the previously used ground station.
- a search is made in the information storage unit 4 (S301). If the same identification information is found as a result of the search, the line selection unit 8 reads out the frequency and time slot information from the line list 7, and the line monitoring unit 3 detects the line status (S302 to S302). S305). This operation is repeated until a good communication line is found.
- a line search by a communication satellite is performed (S 30 2). That is, the identification information search unit 6 searches the identification information storage unit 4 for data matching the identification information with the communication satellite used so far (S306). At this time, data on the searched communication lines, that is, data whose identification information matches that of the ground station is excluded from the search target. If the same identification information is found as a result of the search, the line selection unit 8 reads out the frequency and time slot information from the line list 7, and the line monitoring unit 3 detects the line state (S306 to S31). 0). This operation is repeated until a good communication line is found.
- a sequential line search is performed (S307). That is, the line selecting unit 8 repeats the operation of selecting a communication line from the line list 7 in a predetermined order (for example, address order) and detecting the line state until a communication line with a good line state is found (S 31 1 to S 31 3). At this time, the searched data related to the communication line, that is, the data in which the identification information of the ground station or the identification information of the satellite coincides is excluded from the target of the line search.
- a predetermined order for example, address order
- the identification information writing unit 5 extracts the identification information of the ground station and the communication satellite. Is written to the identification signal memory 4 and The line switching process is terminated (S314).
- the mobile communication device MS captures a communication line provided by the ground station of the identification information D2 via the communication satellite of the identification information E2. It is assumed that the data shown in 10 is stored. If the line condition deteriorates in this state, first, data search is performed using the identification information D2 of the ground station as a key. As a result, the communication line “F 4 & T 1” at address 5 is selected, and a line check is performed. If the line condition of this communication line is not good, next, data search is performed using the identification information E2 of the communication satellite as a key. As a result, the communication line “F 1 & T 2” of address 2 is selected, and the line is checked.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1998/004839 WO2000025539A1 (fr) | 1998-10-26 | 1998-10-26 | Selection d'une ligne de communication et dispositif de communication mobile |
JP55901399A JP3566309B2 (ja) | 1998-10-26 | 1998-10-26 | 通信回線選択方法及び移動体通信装置 |
EP98950390A EP1045599A4 (en) | 1998-10-26 | 1998-10-26 | METHOD FOR SELECTING THE COMMUNICATION LINE AND MOBILE COMMUNICATION DEVICE |
US09/350,281 US6434397B1 (en) | 1998-10-26 | 1999-07-09 | Communication channel selection method and mobile communication apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP1998/004839 WO2000025539A1 (fr) | 1998-10-26 | 1998-10-26 | Selection d'une ligne de communication et dispositif de communication mobile |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/350,281 Continuation US6434397B1 (en) | 1998-10-26 | 1999-07-09 | Communication channel selection method and mobile communication apparatus |
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WO2000025539A1 true WO2000025539A1 (fr) | 2000-05-04 |
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PCT/JP1998/004839 WO2000025539A1 (fr) | 1998-10-26 | 1998-10-26 | Selection d'une ligne de communication et dispositif de communication mobile |
Country Status (4)
Country | Link |
---|---|
US (1) | US6434397B1 (ja) |
EP (1) | EP1045599A4 (ja) |
JP (1) | JP3566309B2 (ja) |
WO (1) | WO2000025539A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010081628A (ja) * | 2003-11-13 | 2010-04-08 | Research In Motion Ltd | 国境地域において、国内ネットワークを優先化するネットワーク選択方法および装置 |
JP2011250042A (ja) * | 2010-05-25 | 2011-12-08 | Kyocera Corp | 無線基地局及びその制御方法 |
US9197388B2 (en) | 2010-05-25 | 2015-11-24 | Kyocera Corporation | Radio base station and control method for the same |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1130799A4 (en) * | 1999-09-13 | 2004-05-12 | Mitsubishi Electric Corp | MOBILE COMMUNICATIONS SYSTEM |
US20030125047A1 (en) * | 2001-12-31 | 2003-07-03 | Syncomm Technology Corp. | Method of updating a set of candidate frequency channels during wireless communications between a radio port and a mobile communications device |
KR100693599B1 (ko) * | 2004-08-21 | 2007-03-14 | 주식회사 팬택앤큐리텔 | 이동통신 단말기의 방송슬롯 감시시스템 및 방법 |
US10892818B2 (en) * | 2019-05-07 | 2021-01-12 | Contec Co., Ltd. | System, apparatus and method for managing satellite operation service |
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JPH0746642A (ja) * | 1993-08-03 | 1995-02-14 | Toshiba Corp | 移動通信回線制御システム |
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JPH09215040A (ja) * | 1996-01-31 | 1997-08-15 | Kenwood Corp | 移動通信の圏外待ち受け方法 |
JPH10126833A (ja) * | 1996-10-08 | 1998-05-15 | Fr Telecom | 非静止衛星における呼の転送方法 |
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US5504803A (en) * | 1991-11-25 | 1996-04-02 | Matsushita Electric Industrial Co., Ltd. | Method for automatic mode selection for a dual-mode telephone handset for use in a cellular mobile telephone system and in a wireless telephone system |
US5280630A (en) * | 1992-01-21 | 1994-01-18 | Motorola, Inc. | Method and apparatus for dynamic channel allocation |
CA2105710A1 (en) * | 1992-11-12 | 1994-05-13 | Raymond Joseph Leopold | Network of hierarchical communication systems and method therefor |
US5548801A (en) * | 1993-02-10 | 1996-08-20 | Kokusai Denshin Denwa Kabushiki Kaisha | System for determining and registering location of mobile terminal for communication system with non-geosynchronous satellites |
US5499386A (en) * | 1993-07-09 | 1996-03-12 | Telefonaktiebolaget L M Ericsson | Best server selection in layered cellular radio system |
US5898928A (en) * | 1996-02-29 | 1999-04-27 | Telefonaktiebolaget Lm Ericsson | Adaptive frequency allocation in a telecommunication system |
US5953665A (en) * | 1996-12-26 | 1999-09-14 | Nokia Mobile Phones Limited | Method and apparatus for digital control channel (DCCH) scanning and selection in a cellular telecommunications network |
US6021314A (en) * | 1997-05-22 | 2000-02-01 | Advanced Micro Devices, Inc. | Free channel selector for selecting an optimal channel |
-
1998
- 1998-10-26 WO PCT/JP1998/004839 patent/WO2000025539A1/ja not_active Application Discontinuation
- 1998-10-26 JP JP55901399A patent/JP3566309B2/ja not_active Expired - Fee Related
- 1998-10-26 EP EP98950390A patent/EP1045599A4/en not_active Withdrawn
-
1999
- 1999-07-09 US US09/350,281 patent/US6434397B1/en not_active Expired - Fee Related
Patent Citations (4)
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JPH0746642A (ja) * | 1993-08-03 | 1995-02-14 | Toshiba Corp | 移動通信回線制御システム |
JPH08139662A (ja) * | 1994-11-09 | 1996-05-31 | Sharp Corp | 制御キャリア検索装置 |
JPH09215040A (ja) * | 1996-01-31 | 1997-08-15 | Kenwood Corp | 移動通信の圏外待ち受け方法 |
JPH10126833A (ja) * | 1996-10-08 | 1998-05-15 | Fr Telecom | 非静止衛星における呼の転送方法 |
Non-Patent Citations (1)
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010081628A (ja) * | 2003-11-13 | 2010-04-08 | Research In Motion Ltd | 国境地域において、国内ネットワークを優先化するネットワーク選択方法および装置 |
JP2011250042A (ja) * | 2010-05-25 | 2011-12-08 | Kyocera Corp | 無線基地局及びその制御方法 |
US9197388B2 (en) | 2010-05-25 | 2015-11-24 | Kyocera Corporation | Radio base station and control method for the same |
Also Published As
Publication number | Publication date |
---|---|
US6434397B1 (en) | 2002-08-13 |
EP1045599A1 (en) | 2000-10-18 |
JP3566309B2 (ja) | 2004-09-15 |
EP1045599A4 (en) | 2004-03-31 |
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