Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/04—Wireless resource allocation
  • H04W72/044—Wireless resource allocation based on the type of the allocated resource
  • H04W72/0466—Wireless resource allocation based on the type of the allocated resource the resource being a scrambling code

Definitions

• the present invention relates to the field of mobile communications, and in particular to a method and apparatus for sharing a dedicated physical channel code resource.
• BACKGROUND In order to carry HSDPA (High Speed Downlink Packet Access) services, not only HS-PDSCH (High-Speed Physical Downlink Shared Channel) but also HS-SCCH (High Speed-) is required. Shared Signaling Control Channel, HS-DPCCH (High Speed-Uplink Dedicated Physical Control Channel), and A-DPCH (Associated-Dedicated Physical Channel) Channel), A-DPCH is usually used to carry SRB (Signaling Radio Bearer).
• the SF (spreading factor) of the A-DPCH is 256 (the corresponding SRB rate is 3.4k, which is the most common configuration. SF can also be 128 ⁇ 32, and the rate corresponding to SRB is 13.6k or higher), each For HSDPA users, an A-DPCH needs to be configured. Each 16 A-DPCH channels consumes 1 SF16 code resource. Usually there are only 13 available SF16 code resources for HSDPA service and A-DPCH (the other 3 are used by common channel and other R99 channels).
• a single cell can even have up to 192 HSDPA users.
• the A-DPCH channel consumes 12 SF16 code resources, and the HSDPA data service can only use one SF16 code resource. Insufficient code resources can barely carry data services.
• the code resource is the most important logical resource in the downlink of the cell.
• the 3GPP (3rd Generation Partnership Project) protocol starts from R6 and introduces F-DPCH (Fractional Dedicated). Physical Channel, part of the dedicated physical control channel) technology, the SRB is carried on the HS-DSCH (High-Speed Downlink Shared Channel), and the F-DPCH only carries the TPC (Transmission Power Control).
• the command, 10 user TPC commands are multiplexed into one SF256 F-DPCH channel, which greatly saves code resource consumption.
• most of the terminals in the existing commercial network do not support the F-DPCH. Therefore, in a cell with a large number of users, the problem that the A-DPCH occupies too much code resources is not well solved.
• Embodiments of the present invention provide a method and apparatus for sharing a dedicated physical channel code resource, which can greatly save code resource consumption accompanying a dedicated physical channel.
• the embodiment of the present invention provides the technical solution as follows:
• a method for sharing a dedicated physical channel code resource including: receiving a radio link setup request; determining whether the radio link setup request is a radio link setup request for a pure data service; when the radio link setup request is a radio link setup request for a pure data service, the service type according to the radio link setup request is from the already used dedicated physical channel
• the A-DPCH code resource set is selected to be allocated to the A-DPCH by the code resource corresponding to the SOFF, where SOFF is the time difference between the slot 0 of the dedicated physical channel and the frame header of the basic common pilot channel rounded by 2560.
• the selecting, according to the service type of the radio link setup request, the code resource corresponding to the available SOFF from the used A-DPCH code resource set to the A-DPCH includes: if the radio link setup request For the initial radio link setup request of the local originating call, the code resource corresponding to the available SOFF is selected from the used A-DPCH code resource set and allocated to the A-DPCH, and a default offset value is generated according to the selected available SOFF. And if the radio link setup request is a soft handover radio link setup request, selecting a code resource corresponding to the available SOFF from the used A-DPCH code resource set to allocate to the A-DPCH.
• the selecting, from the used A-DPCH code resource set, the code resource corresponding to the available SOFF is allocated to the A-DPCH, and generating a default offset value according to the selected available SOFF includes: - in the DPCH code resource set, the available SOFF is searched according to the spreading code number from small to large, the first code resource corresponding to the found available SOFF is allocated to the A-DPCH, and a default offset is generated according to the available SOFF. Value; if the available SOFF is not found in the used A-DPCH code resource set, assign a code resource of the unused SF256 with the smallest spreading code number to the A-DPCH, and the corresponding DPFF is set to 0.
• the selecting, by using the code resource corresponding to the SOFF, from the set of used A-DPCH code resources to the A-DPCH includes: ???a spreading code number from the used A-DPCH code resource set
• the small-to-large search SOFF can be used to allocate the first code resource corresponding to the available SOFF equal to the SOFF of the A-DPCH to the A-DPCH; if the A-DPCH code resource has been used If the available SOFF equal to the SOFF of the A-DPCH is not found in the set, then a code resource of the unused SF256 with the smallest spreading code number is allocated to the A-DPCH.
• the SOFF from the smallest to the largest of the used A-DPCH code resource sets according to the spreading code number includes: if there is already a SOFF allocation of N in the used A-DPCH code resource set. To a certain A-DPCH, it is determined that the following three SOFFs in the A-DPCH code resource set are not available: N, N+2 mod 10, N+8 mod 10.
• the embodiment of the present invention further provides a device for sharing a dedicated physical channel code resource, comprising: a receiving module, configured to receive a wireless link establishment request; and a determining module, configured to determine whether the wireless link establishment request is a pure data service a radio link setup request; the processing module, configured to: when the radio link setup request is a radio link setup request for a pure data service, the service type according to the radio link setup request is from the associated ad hoc private
• the code channel corresponding to the SOFF is allocated to the A-DPCH in the physical channel A-DPCH code resource set, where SOFF is the time difference between the slot 0 of the dedicated physical channel and the frame header of the basic common pilot channel rounded by 2560.
• the processing module includes: a default offset value of the initial radio link and a code resource allocation submodule, configured to: if the radio link setup request is an initial radio link setup request for a local origin call, The code resource corresponding to the SOFF is selected from the set of used A-DPCH code resources and allocated to the A-DPCH, and a default offset value is generated according to the selected available SOFF; a code resource allocation sub-module of the soft handover radio link, configured to select, if the radio link setup request is a soft handover radio link setup request, select an available SOFF from the used A-DPCH code resource set A code resource is allocated to the A-DPCH.
• the default offset value and code resource allocation submodule of the initial radio link includes: a default offset value of the initial radio link and a code resource allocation unit, which is set to be used from the used A-DPCH code.
• the SOFF is available according to the size of the spreading code number;
• the initial radio link establishing interface unit is configured to allocate the found code resource corresponding to the first available SOFF to the A-DPCH, and according to the A default offset value may be generated by SOFF;
• the default offset value and code resource allocation unit of the initial radio link is further configured to allocate if no available SOFF is found in the used A-DPCH code resource set A code resource of the unused SF256 with the smallest spreading code number is given to the A-DPCH, and the corresponding DPFF is set to zero.
• the code resource allocation unit of the soft handover radio link is specifically configured to determine that the A-DPCH is allocated to a certain A-DPCH if there is already a SOFF of the used A-DPCH code resource set.
• the following three SOFFs in the DPCH code resource set are not available: N, N+2 mod 10, N+8 mod 10.
• the code resource allocation submodule of the soft handover radio link includes: a code resource allocation unit of the soft handover radio link, configured to be small from the used A-DPCH code resource set according to the spreading code number Up to the large search available SOFF; the soft handover radio link establishment interface unit is configured to allocate the found first code resource corresponding to the available SOFF equal to the SOFF of the A-DPCH to the A-DPCH; The code resource allocation unit of the soft handover radio link is further configured to allocate a spreading code number minimum if no available SOFF equal to the SOFF of the A-DPCH is found in the used A-DPCH code resource set.
• the unused SF256 code resources are given to the A-DPCH.
• the code resource allocation unit of the soft handover radio link is specifically configured to determine that the A-DPCH is allocated to a certain A-DPCH if there is already a SOFF of the used A-DPCH code resource set.
• the following three SOFFs in the DPCH code resource set are not available: N, N+2 mod 10, N+8 mod 10.
• Embodiments of the present invention have the following beneficial effects: Because the downlink SRB can be carried in the HS-DPCH, in the slot format selected by the downlink A-DPCH channel, only the TPC domain and the Pilot domain are valid, so that multiple A-DPCHs can share one SF256 code resource.
• FIG. 1 is a schematic flowchart of a method for sharing A-DPCH code resources according to an embodiment of the present invention
• FIG. 2 is a timing diagram of a general downlink slot format
• FIG. 3 is a soft cut ratio, a number of users, and an A-DPCH code resource sharing rate.
• FIG. 4 is a schematic diagram of a position of an A-DPCH code resource sharing apparatus in a mobile communication system according to an embodiment of the present invention
• FIG. 5 is a schematic structural diagram of an A-DPCH code resource sharing apparatus according to an embodiment of the present invention
• Embodiment A A schematic flowchart of another method for sharing a DPCH code resource
• FIG. 7 is a schematic diagram of A-DPCH downlink code resource sharing when slot format 2 is used.
• FIG. 1 is a schematic flowchart of a method for sharing A-DPCH code resources according to an embodiment of the present invention. As shown in FIG.
• this embodiment includes: Step a: receiving a radio link setup request; Step b: determining the radio link setup request Whether to establish a request for a wireless link of a pure data service; Step C: When the radio link setup request is a radio link setup request for a pure data service, select an available SOFF corresponding from the used A-DPCH code resource set according to the service type of the radio link setup request.
• the code resource is allocated to the A-DPCH, where SOFF is the time difference between the slot 0 of the dedicated physical channel and the frame header of the basic common pilot channel rounded by 2560.
• the downlink SRB can be carried in the HS-DPCH, in the slot format selected by the downlink A-DPCH channel, only the TPC domain and the Pilot domain are valid, so that multiple A-DPCHs can share one SF256 code resource.
• the radio link setup request is a radio link setup request for the pure data service
• the code corresponding to the available SOFF is selected from the used A-DPCH code resource set according to the service type of the radio link setup request.
• the resources are allocated to the A-DPCH, so that the code resource consumption of the A-DPCH can be greatly saved without relying on the F-DPCH technology.
• the service type according to the radio link setup request selects an available SOFF corresponding to the used A-DPCH code resource set.
• the allocation of the code resource to the A-DPCH includes: if the radio link setup request is the initial radio link setup request of the local originating call, selecting the code resource allocation corresponding to the available SOFF from the used A-DPCH code resource set. Giving A-DPCH, and generating a default offset value according to the selected available SOFF; if the radio link setup request is a soft handover radio link setup request, selecting from the already used A-DPCH code resource set The code resource corresponding to SOFF may be allocated to the A-DPCH.
• the selecting, from the used A-DPCH code resource set, the code resource corresponding to the SOFF may be allocated to the A-DPCH, and according to the Selecting the available SOFF to generate the default offset value includes: from the used A-DPCH code resource set, according to the spreading code number from the small to the largest, the available SOFF is used, and the found first available SOFF corresponding code resource is allocated to Determining, by the A-DPCH, a default offset value according to the available SOFF; if no available SOFF is found in the used A-DPCH code resource set, assigning a minimum spreading code number is unused The code resource of the passed SF256 is given to the A-DPCH, and the corresponding DPFF is set to zero.
• the selecting, by using the code resource corresponding to the SOFF from the used A-DPCH code resource set, to the A-DPCH includes: From the set of A-DPCH code resources that have been used, the available SOFF is searched for from the small to the largest according to the spreading code number, and the first code resource corresponding to the available SOFF equal to the SOFF of the A-DPCH is allocated to the code resource.
• the A-DPCH if an available SOFF equal to the SOFF of the A-DPCH is not found in the already used A-DPCH code resource set, an unused SF256 with the smallest spreading code number is assigned.
• the code resource is given to the A-DPCH.
• the searching for the available SOFF according to the spreading code number from the used A-DPCH code resource set includes: If the SOFF of the used A-DPCH code resource set is already assigned to an A-DPCH, it is determined that the following three SOFFs in the A-DPCH code resource set are unavailable: N, N+2 mod 10 , N+8 mod 10.
• the embodiment of the present invention further provides a device for sharing a dedicated physical channel code resource, comprising: a receiving module, configured to receive a wireless link establishment request; and a determining module, configured to determine whether the wireless link establishment request is a pure data service a radio link setup request; the processing module, configured to: when the radio link setup request is a radio link setup request for a pure data service, the service type according to the radio link setup request is from the associated ad hoc private
• the code channel corresponding to the SOFF is allocated to the A-DPCH in the physical channel A-DPCH code resource set, where SOFF is the time difference between the slot 0 of the dedicated physical channel and the frame header of the basic common pilot channel rounded by 2560.
• the downlink SRB can be carried in the HS-DPCH, in the slot format selected by the downlink A-DPCH channel, only the TPC domain and the Pilot domain are valid, so that multiple A-DPCHs can share one SF256 code resource.
• the radio link setup request is a radio link setup request for the pure data service
• the code corresponding to the available SOFF is selected from the used A-DPCH code resource set according to the service type of the radio link setup request.
• the resources are allocated to the A-DPCH, so that the code resource consumption of the A-DPCH can be greatly saved without relying on the F-DPCH technology.
• the processing module includes: a default offset value of the initial radio link and a code resource allocation submodule, configured to: if the radio link setup request is an initial radio link setup request for a local origin call, A set of A-DPCH code resources that have been used Selecting a code resource corresponding to the SOFF to be allocated to the A-DPCH, and generating a default offset value according to the selected available SOFF; a code resource allocation sub-module of the soft handover radio link, configured to be if the radio link setup request is soft The switched radio link setup request is used to select a code resource corresponding to the available SOFF from the used A-DPCH code resource set to be allocated to the A-DPCH.
• a code resource allocation submodule configured to: if the radio link setup request is an initial radio link setup request for a local origin call, A set of A-DPCH code resources that have been used Selecting a code resource corresponding to the SOFF to be allocated to the A-DPCH, and generating a default offset value according to the selected available SOFF
• the default offset value and code resource allocation submodule of the initial radio link includes: a default offset value of the initial radio link and a code resource allocation unit, which is set to be used from the used A-DPCH code.
• the SOFF is available according to the size of the spreading code number;
• the initial radio link establishing interface unit is configured to allocate the found code resource corresponding to the first available SOFF to the A-DPCH, and according to the A default offset value may be generated by SOFF;
• the default offset value and code resource allocation unit of the initial radio link is further configured to allocate if no available SOFF is found in the used A-DPCH code resource set A code resource of the unused SF256 with the smallest spreading code number is given to the A-DPCH, and the corresponding DPFF is set to zero.
• the code resource allocation unit of the soft handover radio link is specifically configured to determine that the A-DPCH is allocated to a certain A-DPCH if there is already a SOFF of the used A-DPCH code resource set.
• the following three SOFFs in the DPCH code resource set are not available: N, N+2 mod 10, N+8 mod 10.
• the code resource allocation submodule of the soft handover radio link includes: a code resource allocation unit of the soft handover radio link, configured to be small from the used A-DPCH code resource set according to the spreading code number Up to the large search available SOFF; the soft handover radio link establishment interface unit is configured to allocate the found first code resource corresponding to the available SOFF equal to the SOFF of the A-DPCH to the A-DPCH; The code resource allocation unit of the soft handover radio link is further configured to allocate a spreading code number minimum if no available SOFF equal to the SOFF of the A-DPCH is found in the used A-DPCH code resource set. The unused SF256 code resources are given to the A-DPCH.
• the code resource allocation unit of the soft handover radio link is specifically configured to be used if
• FIG. 2 is a timing diagram of a general downlink slot format defined by the 3GPP protocol, usually a downlink DPCH (Dedicated Physical Channel) according to time.
• the order of sending consists of the following parts:
• the Data1 domain and the Data2 domain are used to carry data. If no data is sent, the domain does not send power.
• the TPC field which is used to carry the uplink TPC command, is mandatory and has a fixed size of 2 bits.
• the TFCI (Transport Format Combination Indicator) field is used to indicate the transmission format of the currently transmitted data, and the auxiliary UE (user terminal) performs data decoding. In some slot formats, this field may be absent; the present invention preferably uses the downlink slot format 2, and the TFCI field is absent;
• the Pilot field which is used to carry pilot bits, for the UE to use for channel estimation, is mandatory.
• Table 1 summarizes the definition of some downlink time slot formats defined by the 3GPP protocol: Table 1
• the SF is 256, a total of 20 bits, wherein the bit numbers of each domain are: Datal domain 2 bits; Data2 domain 14 bits; TPC domain 2 bits; TFCI domain Obit, empty; Pilot domain 2bits.
• the DPCH at this time usually only carries the SRB, which is called A-DPCH.
• the A-DPCH is preferably slot format 2, and the SRB is required to be carried on the HS-DSCH.
• the downlink slot format 2 has 20 bits, and the TPC domain and the Pilot domain only occupy 4 bits in total.
• the 16-bits corresponding time has no data transmission, that is, the code resources occupied by the A-DPCH can be used in the time corresponding to the 16 bits.
• Other users occupy, which allows multiple A-DPCHs to share one SF256 code resource, as long as the TPC domain and the Pilot domain of these users are completely staggered in timing.
• the following line slot format 2 is taken as an example, and a maximum of 4 A-DPCHs are allowed to share one SF256 code resource.
• 4 illustrates an A-DPCH code resource sharing apparatus of the present invention, which is located in a radio network controller in a UMTS (Universal Mobile Telecommunications System).
• UMTS Universal Mobile Telecommunications System
• Initial RL Radio Link
• the initial RL refers to an RL that needs to be established by a UE that initiates a call in the local cell. In addition to allocating the downlink code resources, you also need to assign the DOFF (default offset) parameter.
• the interface unit only provides an interface for allocating code resources and DOFF parameters to the initial RL; DOFF and code resource allocation unit of the initial RL: allocating DOFF parameters and code resources to the RL of the pure data service initially established by the current cell, so that the A-DPCH The code resources do not conflict, and the multiplexing rate is as high as possible.
• the soft handover RL establishes the interface unit:
• the rounded chipOffset (chip offset value) of the soft handover RL is random, and only the downlink code resource needs to be allocated.
• the interface unit only provides an interface for allocating code resources to the soft handover RL.
• the code resource allocation unit of the soft handover RL allocates code resources to the RL of the pure data service that is soft-switched, so that the code resources of the A-DPCH do not conflict, and The reuse rate is as high as possible.
• Step 101 Receive an RL establishment request for a pure data service;
• the A-DPCH code resource sharing method of the present invention is enabled only for the RL establishment request of the pure data service. If the voice is carried on the DPCH, the method of the present invention is not recommended, because in the downlink slot format corresponding to this case, the Datal and Data2 parts have data transmission.
• Step 102 If it is the initial RL establishment request of the local originating call, the process of “initial RL DOFF and code resource allocation” is performed; if it is a soft handover RL establishment request, the process of “soft handover RL code resource allocation” is performed; Step 103 : "DOFF and Code Resource Allocation for Initial RL" Optimization Procedure: Define “symbol chipOffset” (segment offset value, SOFF) as time slot 0 and PCPICH of DPCH
• the 3GPP protocol defines the PCPICH of the cell as a timing reference for all downlink physical channels.
• the deviation of the frame header of each DPCH from the PCPICH frame header is defined as chipoffset (value range 0 ⁇ 38399chips).
• the 3GPP protocol requires that nodeB be rounded to 256 chips when using chipoffset.
• the rounded chipoffset is abbreviated as RchipOffset. For example: chipoffset is 305chips, the corresponding RchipOffset is 256chips ; chipoffset is 501chips, and the corresponding RchipOffset is 512chips.
• the RNC allocates a DOFF indicating the frame head time difference between the DPCH and the PCPICH.
• the range of DOFF (Resolution: 512 chips; Range: 0 .. 599)
• SOFF (RchipOffset mod 2560)/256 Take Figure 7 as an example: SOFF of UE1 is 0, SOFF of UE2 is 1, and SOFF of UE3 is 4.
• the SOFF corresponding to UE4 is 5.
• For the initial RL establishment request of the local originating call from the "A-DPCH code resource set already used”, find the "available SOFF” according to the spreading code number from the beginning to the end, and find the first "available SOFF”.
• the code resource corresponding to this "available SOFF” is assigned to the A-DPCH, and DOFF is generated according to this "available SOFF”; if "available SOFF" is found in the "available A-DPCH code resource set",
• the code resource of the unused SF256 with the smallest spreading code number is newly allocated, and the corresponding DOFF is selected as 0.
• the available code resources with SF of 256 are numbered from 0 to 255 from left to right, and the code resources of the used SF256 with the smallest number are preferably multiplexed in the present invention.
• the purpose is to increase the reuse rate and reduce the fragmentation of code resources.
• the preferred method for judging whether a "already used A-DPCH code resource" can be multiplexed by other A-DPCHs is as follows: A certain SF256 code resource has 10 corresponding "available SOFF" before being used. , are 0 to 9, respectively. If assigned to an A-DPCH, and the SOFF of the A-DPCH is N, then the following three SOFFs of the code resource cannot be reused:
• Step 104 "Software Switching RL Code Resource Allocation” Similar to step 103, there is no DOFF allocation process, because for soft-cut users, the SOFF of the A-DPCH is random, not allocated by the RNC.
• the terminal corresponding to the HSDPA supports the configuration corresponding to the technology.
• 3 is a schematic diagram showing the relationship between the soft cut ratio, the number of users, and the A-DPCH code resource sharing rate.
• the abscissa is the number of single cell users, and the ordinate is the code resource sharing multiple.
• the soft switching ratio is 0%, the soft switching ratio is 40%, and the soft switching ratio is 100%.
• the soft handover ratio of the outdoor site is 40%.
• the technical solution provided by the embodiments of the present invention can be applied to the sharing of dedicated physical channel code resources in wireless communication, and the available service type of the wireless link establishment request is selected from the used A-DPCH code resource sets.
• the code resource corresponding to SOFF is allocated to the A-DPCH, so that the code resource consumption of the A-DPCH can be greatly saved without relying on the F-DPCH technology.

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