WO2001080579A1 - Apparatus and method for providing separate forward dedicated and shared control channels in a communications system - Google Patents
Apparatus and method for providing separate forward dedicated and shared control channels in a communications system Download PDFInfo
- Publication number
- WO2001080579A1 WO2001080579A1 PCT/US2001/010206 US0110206W WO0180579A1 WO 2001080579 A1 WO2001080579 A1 WO 2001080579A1 US 0110206 W US0110206 W US 0110206W WO 0180579 A1 WO0180579 A1 WO 0180579A1
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- Prior art keywords
- control
- data
- channel
- control channel
- control information
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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
- H04B7/24—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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
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- 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
- H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
- H04B7/2637—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] for logical channel control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/004—Orthogonal
- H04J13/0048—Walsh
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
- H04J13/18—Allocation of orthogonal codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Definitions
- the present invention relates to an apparatus and method for providing separate dedicated and shared control channels in a communications system and, more particularly, in a forward link of a Code Division Multiple Access (CDMA) communication system.
- CDMA Code Division Multiple Access
- CDMA Code Division Multiple Access
- WCDMA Wideband Code Division Multiple Access
- dedicated channels are required for sending data and also for control of the system.
- a single channel is used to carry the information to be transmitted and characteristics of the transmitted information are conveyed on another separate forward control channel.
- Each of these channels occupies a Walsh code from a finite set of available Walsh codes. To keep the system from becoming Walsh code limited it is important to conserve Walsh code resources.
- the allocation of these dedicated channels for each user typically requires rapid shuffling between dormant and active states to free up Walsh code resources.
- SHCH 16 shared channel
- ARQ reverse link automatic repeat request
- the shared channel SHCH 16 is the forward channel used to send data packets to users in the active state and can reach very high peak data rates by using over 80% of the available Walsh code resources.
- the Walsh code resources are limited in the conventional systems because of the relatively small spreading factor sizes required to support the required pay load and coding bits sent on the SHCH 16.
- a larger size spreading factor is critical for affording less power and more users to be supported, which are possible if bits can be more efficiently allocated.
- the desire is to use as little of the Walsh Code resource as possible for a dedicated channel that, therefore, requires using a large spreading factor (a Walsh code of relatively large size such as 256 for CDMA2000 or WCDMA).
- a large spreading factor a Walsh code of relatively large size such as 256 for CDMA2000 or WCDMA.
- the smaller the Walsh code resource used the larger the number of dedicated channels that may be supported, which helps make rapid shuffling requirements less stringent.
- With a large spreading factor it is difficult to support many bits for a given frame duration, which is typically small (e.g. 3.33ms) to match that of a data channel like the SHCH 16, and to optimize over the air transmission and scheduling.
- Using smaller spreading factors not only uses more Walsh code resources, but requires more transmit power for a given reliability level and reduces system capacity. Also it is possible to achieve more bits with a large spreading factor by using higher order modulation such as 8PSK but, again, at the expense of more transmit power.
- Figure 1 illustrates a diagram of a communication system incorporating the method and apparatus incorporating a method and apparatus using separate dedicated and shared control channels in accordance with a preferred embodiment
- Figure 2 illustrates a frame format for a dedicated pointer channel in an assignment format according to a preferred embodiment of the present invention
- Figure 3 illustrates a frame format for a dedicated pointer channel in a null format according to a preferred embodiment of the present invention
- Figure 4 illustrates a frame format of a shared control channel according to an embodiment of the present invention.
- Figure 5 illustrates a schematic diagram for providing separate dedicated and shared control channels according to an embodiment of the present invention.
- DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to better use the Walsh Code resource efficiently, it is possible to separate control and layer 3 information into data that is required to be sent in every frame interval whether or not a mobile user is scheduled to receive data over a data channel such as the shared channel (SHCH 16) and additional data that only needs to be sent when the SHCH 16 is scheduled for that user or when layer 3 information needs to be sent.
- a data channel such as the shared channel (SHCH 16)
- additional data that only needs to be sent when the SHCH 16 is scheduled for that user or when layer 3 information needs to be sent.
- the dedicated control channel is always transmitted to a given user that is not in a dormant state.
- the shared dedicated channel is allocated to a given user if it is to receive data over a data channel such as the SHCH 16 and needs information to properly decode and use it or layer 3 information needs to be sent and hence, in either case, more bits are needed.
- a data channel such as the SHCH 16
- layer 3 information needs to be sent and hence, in either case, more bits are needed.
- Dedicated control channels will be referred to as dedicated pointer channels (DPTRCH 18) in this description.
- the present invention is directed to a method and apparatus that provide a separate pointer channel and shared control channel instead of a single control channel as employed in the conventional systems.
- a statistical approach can be taken that allows control information and other information that is requisitely persistent to be transmitted via a dedicated control channel while other information that is intermittent may be transmitted in shared channel resources.
- This statistical splitting of control information into multiple channels affords more economical use of Walsh code resources and sufficient bits at lower power levels without over reliance on the shared channel SHCH 16.
- the dedicated pointer control channel DPTRCH 18 is used to continuously communicate information including whether or not a mobile unit in a forward link portion of a spread spectrum communication system has need to receive information concerning a data channel such as a shared channel SHCH 16 that is accessed via the shared control channel SHCCH 17.
- the dedicated pointer control channel DPTRCH 18 is used to point to the shared control channel SHCCH 17 when information is to be sent via a data channel, in this case the shared channel SHCH 16, thereby allowing the shared channel resources to be used only when needed and, hence, more efficiently.
- Figure 1 illustrates a communication system, shown generally at 10, including a base station 12 and a mobile unit 14. Within the forward link from the base 12 to the mobile 14, is a shared channel SHCH 16, a shared control channel SHCCH 17 and a dedicated pointer control channel DPTRCH 18. In the present system, however, only the dedicated pointer control channel DPTRCH 18 is persistent, allowing only those mobile units in an active state that require further control via the shared control channel SHCCH 17 and the forward link channel SHCH 16 to have more available Walsh codes to use.
- the dedicated pointer control channel DPTRCH 18 is used to point to a pool of shared control channels SHCCH 17 that supplement the pay load of the dedicated pointer control channel DPTRCH 18 in order to convey assignments on the shared data channel SHCH 16.
- Figure 2 illustrates a typical dedicated pointer control channel DPTRCH frame 20 in an assignment format (i.e. , when the frame is used to convey information concerning a shared control channel SHCCH 17).
- the first field is an indicator or pointer field 22 that communicates whether information on a shared control channel SHCCH 17 needs to be transmitted and the Walsh code assignment of the particular shared control channel SHCCH 17 to which this field points.
- the pointer field 22 may be of any length necessary to communicate the number of different shared channel Walsh codes allocated for the shared channels. In a preferred embodiment, this pointer field is set at 3 bits, which is capable of communicating up to 8 different states of the shared channel SHCCH 17.
- the next field within the dedicated pointer control channel frame 20 is a reserved link control 24 that is used to communicate information such as the message sequence length shown in field 30 contained within the reserved link control field 24.
- the reserved link control field 24 may also contain reverse link scheduling information (not shown). Further information may include a hybrid automatic repeat request HARQ shown in field 32 of the reserve link control 24.
- the reserved link control field 24 may contain the starting Walsh code, the modulation coding scheme (MCS) and ARQ information.
- the dedicated pointer control channel frame 20 also contains cyclic redundancy check CRC information for forward error correction shown in field 26 of the frame 20. Additionally, the frame contains power control bit information 27 to regulate the reverse link power for a CDMA system and a tail 28 to mark the end of the frame.
- the dedicated pointer control channel frame 20 is typically 5 milliseconds long.
- the time length of the frame is not limited to this amount, but could be modified to whatever particular communication system the frame is being used.
- the fields and width in bits may also be modified in the dedicated pointer control channel frame 20.
- Figure 3 illustrates a dedicated pointer control channel DPTRCH frame 34 in a "null" format or, in other words, when informat ion is not required to be transmitted on a corresponding shared control channel SHCCH 17.
- the null frame 34 contains a pointer field 35, a CRC field 37, a power control bit field 38 and a tail 39.
- the null frame format merely transmits a reserved field 36 containing reverse link scheduling information for the reverse link in a CDMA system.
- FIG. 4 illustrates a shared control channel SHCCH frame shown generally at 40.
- the shared control channel frame 40 includes an assignment field 42 having various aperiodic or intermittent information such as information required for demodulation of the shared channel SHCH 16 or as a transport for automatic repeat request ARQ feedback in layer 3 signaling information.
- the assignment field 42 of the shared control channel frame 40 is shown to include fields 48-50, which may include a field 48 for indicating the particular modulating coding scheme MCS that is used in the forward shared channel SHCH 16, a starting Walsh code 49 and gain information 50.
- the shared control channel frame 40 Similar to the dedicated pointer control frame, the shared control channel frame 40 also includes a cyclic redundancy check CRC field 44 and tail information in field 46.
- the assignment field 42 may instead contain gain information, ARQ information and Layer 3 signaling information, while the dedicated pointer channel frame carries information concerning the starting Walsh codes, the MCS and further ARQ information.
- Other combinations of field assignments to the dedicated pointer control channel frame 20 and the shared control channel frame 34 are also possible.
- further enhancements of the scheme are readily observable, such as additional levels of SHCCH 17 and joint coding (either correction or error detection) across the codes a user receives and uses.
- the dedicated pointer channel DPTRCH 18 and shared control channel SHCCH 17 are assigned to part of a Walsh code tree that does not overlap with the codes for the forward shared channel SHCH 16.
- the dedicated pointer channel DPTRCH 18 and shared control channel SHCCH 17 would be assigned to a portion of a Walsh code tree that does not overlap with codes 2-15 of length 16, for instance.
- mobile users in the active state maintain a unique dedicated pointer channel DPTRCH 18 that is assigned a Walsh code of length 512.
- FIG. 5 illustrates an apparatus for generating the respective dedicated pointer control channel DPTRCH 18 and shared control channel SHCCH 17.
- a dedicated pointer control channel generator 60 includes a convolutional coder 64 that receives control data from a transmitter (e.g., a base station) be input thereto.
- the encoding data is then sent to an interleaver 66 that interleaves the data according to any number of known interleaving schemes.
- an M-ary modulator 68 modulates the data according to any number of known modulation schemes such as QPSK or 8PSK.
- the modulated data is then sent to multiplexer 70, which multiplexes the modulated data with power control bit information.
- the power control bit is included in the dedicated pointer control channel DPTRCH 18 since this information is required for each user within the base station 12 cell, irrespective of whether the mobile is in the active or control hold state (an active state being when data is transmitted to be received by the mobile and the control hold state being when no data is transmitted to the mobile).
- the multiplexed data BDPTR output from the multiplexer 70 is then multiplied by a multiplier 72 with a Walsh code w n and output for transmission at particular chip rate Re.
- the chip rate is equal to 1.2288 million chips per second (Mcps) according to the IS95 standard or 3.84 Mcps according to WCDMA.
- control data B is prevented from being transmitted in those instances where a mobile is in a control hold state and no data via the shared channel SHCH 16 is to be transmitted to the mobile 14 within the time frame of the dedicated pointer control channel frame. Hence, a "null" frame will be generated with only the requisite power control bit information.
- a shared control channel generator 62 contains similar elements as the dedicated pointer control channel generator 60, including a convolutional encoder 74 and interleaver 76 and an M-ary modulator 78. However, the shared channel control generator 62 does not require a multiplexer since the power control bit information is sent only via the dedicated pointer control channel DPTRCH 18. Thus the modulated control data BSCH from the modulator 78 is multiplied by multiplier 80 by Walsh codes Wn for transmission on the forward link. Of course, if a mobile unit to which control data is sent is in the control hold state no control data BSCH will be transmitted via the shared controlled channel generator 62.
Abstract
Description
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001249632A AU2001249632A1 (en) | 2000-04-17 | 2001-03-30 | Apparatus and method for providing separate forward dedicated and shared controlchannels in a communications system |
EP01922879A EP1277358B1 (en) | 2000-04-17 | 2001-03-30 | Apparatus and method for providing separate forward dedicated and shared control channels in a communications system |
DE60138538T DE60138538D1 (en) | 2000-04-17 | 2001-03-30 | EPARATE FORWARD DEDICATED CHANNELS WITH COMMON USE IN A COMMUNICATION SYSTEM |
JP2001576701A JP4603227B2 (en) | 2000-04-17 | 2001-03-30 | Apparatus and method for providing separate forward dedicated and shared control channels in a communication system |
CA002377227A CA2377227C (en) | 2000-04-17 | 2001-03-30 | Apparatus and method for providing separate forward dedicated and shared control channels in a communications system |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US19758800P | 2000-04-17 | 2000-04-17 | |
US60/197,588 | 2000-04-17 | ||
US09/703,775 | 2000-11-01 | ||
US09/703,775 US6934275B1 (en) | 2000-04-17 | 2000-11-01 | Apparatus and method for providing separate forward dedicated and shared control channels in a communications system |
Publications (1)
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WO2001080579A1 true WO2001080579A1 (en) | 2001-10-25 |
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PCT/US2001/010206 WO2001080579A1 (en) | 2000-04-17 | 2001-03-30 | Apparatus and method for providing separate forward dedicated and shared control channels in a communications system |
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US (1) | US6934275B1 (en) |
EP (1) | EP1277358B1 (en) |
JP (1) | JP4603227B2 (en) |
KR (1) | KR100448751B1 (en) |
CN (1) | CN1190977C (en) |
AU (1) | AU2001249632A1 (en) |
CA (1) | CA2377227C (en) |
DE (1) | DE60138538D1 (en) |
WO (1) | WO2001080579A1 (en) |
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- 2001-03-30 CN CNB018008704A patent/CN1190977C/en not_active Expired - Lifetime
- 2001-03-30 CA CA002377227A patent/CA2377227C/en not_active Expired - Lifetime
- 2001-03-30 EP EP01922879A patent/EP1277358B1/en not_active Expired - Lifetime
- 2001-03-30 JP JP2001576701A patent/JP4603227B2/en not_active Expired - Lifetime
- 2001-03-30 DE DE60138538T patent/DE60138538D1/en not_active Expired - Lifetime
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US7426393B2 (en) | 2001-11-19 | 2008-09-16 | Nokia Corporation | Method and system of identifying network services |
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US7508804B2 (en) | 2002-04-05 | 2009-03-24 | Alcatel-Lucent Usa Inc. | Shared signaling for multiple user equipment |
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WO2008082206A1 (en) * | 2006-12-29 | 2008-07-10 | Samsung Electronics Co., Ltd. | Method and apparatus for transmitting and receiving control channel message in a mimo mobile communication system |
US8194781B2 (en) | 2006-12-29 | 2012-06-05 | Samsung Electronics Co., Ltd | Method and apparatus for transmitting and receiving control channel message in a MIMO mobile communication system |
US10862554B2 (en) | 2007-01-12 | 2020-12-08 | Samsung Electronics Co., Ltd | Method and apparatus for managing control channel in a mobile communication system using multiple antennas |
US8774152B2 (en) | 2007-01-12 | 2014-07-08 | Samsung Electronics Co., Ltd. | Method and apparatus for managing control channel in a mobile communication system using multiple antennas |
US9312936B2 (en) | 2007-01-12 | 2016-04-12 | Samsung Electronics Co., Ltd | Method and apparatus for managing control channel in a mobile communication system using multiple antennas |
US9787380B2 (en) | 2007-01-12 | 2017-10-10 | Samsung Electronics Co., Ltd | Method and apparatus for managing control channel in a mobile communication system using multiple antennas |
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Also Published As
Publication number | Publication date |
---|---|
CA2377227C (en) | 2005-08-30 |
CN1366781A (en) | 2002-08-28 |
EP1277358A4 (en) | 2005-10-26 |
CA2377227A1 (en) | 2001-10-25 |
US6934275B1 (en) | 2005-08-23 |
DE60138538D1 (en) | 2009-06-10 |
AU2001249632A1 (en) | 2001-10-30 |
JP4603227B2 (en) | 2010-12-22 |
EP1277358B1 (en) | 2009-04-29 |
KR100448751B1 (en) | 2004-09-18 |
CN1190977C (en) | 2005-02-23 |
EP1277358A1 (en) | 2003-01-22 |
KR20020019090A (en) | 2002-03-09 |
JP2003531534A (en) | 2003-10-21 |
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