CN101965064B - Method and device for transmitting packet data convergence protocol data - Google Patents

Method and device for transmitting packet data convergence protocol data Download PDF

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Publication number
CN101965064B
CN101965064B CN200910158273.8A CN200910158273A CN101965064B CN 101965064 B CN101965064 B CN 101965064B CN 200910158273 A CN200910158273 A CN 200910158273A CN 101965064 B CN101965064 B CN 101965064B
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user data
data
base station
loop module
user terminal
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CN101965064A (en
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刘海军
王坚
黄波
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Nantong Zhongkang Medical Technology Co.,Ltd.
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ZTE Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/11Allocation or use of connection identifiers

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a method for transmitting packet data convergence protocol data, comprising the following steps of: setting a corresponding local user data loop module for each PDCP (Packet Data Convergence Protocol) entity in a base station, receiving a UE identifier pair allowing direct user data exchange in the base station and issued by a network side and storing the UE identifier by the base station; receiving uplink data of the UE and transmitting the uplink data to the local user data loop module of the UE by the PDCP entity of the UE in the base station; analyzing the uplink data packet by the local user data loop module of the UE and judging whether the uplink data packet accords with the preset strategy, if so, transmitting the uplink data packet to the destination UE directly by the local user data loop module of the UE. The invention also discloses a device for transmitting packet data convergence protocol data. The invention greatly reduces the data transmission pressure of a core net.

Description

The transmission method of packet data convergence protocol data and device
Technical field
The present invention relates to packet data polymerized agreement (PDCP, Packet Data Convergence Protocol) transmission technology of data, relate in particular to transmission method and the device of packet data convergence protocol data in a kind of Long Term Evolution (LTE, Long Term Evolution) system.
Background technology
Mobile communication system has developed into LTE at present.LTE has adopted OFDM (OFDM, Orthogonal Frequency Division Multiplexing), multiple-input and multiple-output (MIMO, MultipleInput Multiple Output) etc. technology, in wireless network networking, adopt double-layer structure, and introduce home evolved node B (HeNB, Home evolved NodeB).Fig. 1 is the structural representation that includes the LTE of HeNB, comprise user terminal (UE, User Equipment), access node (eNB, evelvedNodeB), family's access node (HeNB, Home evolved NodeB) and core network (EPC, Evolved Packet Core).ENB, HeNB form wireless access network (RAN, Radio AccessNetwork), RAN is for the treatment of all and wireless relevant function, and EPC processes all data and connects and comprise voice call (VoIP, Voice over Intemet Protocol), and the exchange of realization and external network and routing function.
Fig. 2 is LTE user data transmission protocol data structure and transfer of data schematic diagram, as shown in Figure 2, PDCP entity is arranged in UE and RAN, the header compress/decompress of executing data bag respectively, integrity protection, the functions such as transmitting user data, the PDCP data cell (PDCP-PDU) being generated by packet is forwarded to wireless link control (RLC, Radio Link Control) layer by PDCP entity; In the time switching, the package forward of the sequence number corresponding packet of its maintenance and buffer memory is arrived to object eNB.PDCP entity is separately positioned in UE and RAN, can be set to one or more.The transmission of user data will be from UE, finally just start to arrive business service network through eNB, gateway (S-GW), PDN Gateway (P-GW).In this process, from PDCP sublayer, approach the real content of user data most.
Taking upstream data as example, the flow process that PDCP entity transmits data is:
Step 1: in UE, the application layer data of UE is packaged into Internet protocol (IP) packet or point-to-point protocol (PPP, Point to Point Protocol) Packet Generation to the PDCP entity in UE;
Step 2: the PDCP entity in UE, in accordance with RoHC (Robust Header Compression), carries out header-compressed to packet, sends the rlc layer in UE to after generation PDCP-PDU;
Step 3: the rlc layer in UE sends to media access control (MAC, MediaAccess Control) layer after this PDCP-PDU is increased to RLC header; MAC layer in UE, increases to the PDCP-PDU that has increased RLC header the physical layer that sends to UE after mac header; In the physical layer of UE, the PDCP-PDU of this increase RLC header and mac header is carried out sending to the eNB under UE after the operations such as coded modulation;
Step 4: eNB carries out this PDCP-PDU sending to the MAC layer in eNB after the operations such as coded demodulation, MAC layer in eNB is removed the mac header adding in step 3, the protocol Data Unit (PDU, Protocol Data Unit) of removing after mac header is sent to the rlc layer in eNB; Rlc layer in eNB is removed after the RLC header adding in step 3, and the PDCP-PDU removing after mac header and RLC header is sent to the PDCP entity in eNB;
Step 5: the PDCP entity in eNB uses RoHC that PDCP-PDU is carried out to header decompression, generates IP packet or PPP information bag;
Step 6: eNB sends to EPC by general packet radio service system tunnel protocol-user face (GTP-U) tunnel through S1 interface by IP packet or PPP information bag, and EPC sends to IMS or external network by IP packet or PPP information bag again.
Above-mentioned is the process that sends packet from UE to external network, the namely process of uplink data sending bag.Send the process of packet to UE from external network, be that the process of descending transmission packet and the process of uplink data sending bag are similar, just the PDCP entity in eNB is responsible for that downlink data packet is carried out to PDCP header-compressed and is formed PDCP-PDU transmission, and PDCP entity in UE is responsible for the PDCP-PDU receiving to carry out header decompression transmission.
In LTE, HeNB is the one of base station, is mainly used in the private resource of private user, is deployed in the private sites such as family, group, company or school and uses, and only limits some specific user's access.HeNB covers with the E-UTRAN honeycomb solving among a small circle, is connected to Access Network by fixed line (as digital subscriber line DSL), and user's miscellaneous service can complete by HeNB (such as phone, online etc.).HeNB attracts user's aspect to be its abundant, location-based business, the preferably advantage of service quality and differentiated charging aspect.The function of HeNB has been continued to use the basic function of the common eNB of part, also may increase some user oriented private functions, for example HeNB owner can configure function, appliance network control of use (increase delete user), the home gateway of HeNB etc.
The advantage of HeNB has: be connected to Access Network by fixed line, save operator and set up base station and maintenance cost; Solve the capacity problem of indoor covering and eNB, in addition, because HeNB coverage is little, provide the feature of whole cell radio resources to a few users, it can utilize the high speed access characteristic of LTE more fully; And provide preferential rate, mobile operator to seize fixed network operation market (it is generally acknowledged that HeNB can use the rate of monthly payment).The mode of user's use HeNB is as Wi-Fi router, can plug and play, wireless Internet access, and difference is that user no longer needs other terminal equipment, and only need to use general LTE mobile phone or LTE data card.During as the access of medium-sized and small enterprises/office data, application class is similar to family data access product, but need to expand its access capacity, to service is provided can to the crew of office, the data circuit that this product can be rented by enterprise is connected to IAD, and then connects mobile core network, is different from addition domestic. applications scene, to there are a large amount of inner voice/data communications in enterprise's application scenarios, therefore also have the demand that realizes speech and data inner exchanging.
HeNB is also relevant with closed user group (CSG, Closed Subscriber Group) concept, allows the user of access to family base station overlay area to be called CSG user.Belong to the namely CSG region, region of one or more HeNB coverings of this user's group.Each CSG identifies with unique mark in a public land mobile network (PLMN, Public Land Mobile Network).Yi Ge community (cell) can only belong to a CSG region or a tracing area (TA, Tracking Area).CSG and TA geographically can crossovers.The multiple cell that belong to same CSG region may be discontinuous on geographical position, may be in one or more TA together.Broadcast and can know that this community is CSG cell or TA cell by cell.
Only have the user through authorizing could allow to be linked in CSG, concept and the TA of CSG are similar, are all made up of several communities.Allow access CSG list (white list) can control the access of non-CSG user to HeNB by setting in UE and MME, in MME, store the corresponding relation database of TA and CSG, will allow the CSG list of accessing to be issued to the CSG user of license at ATTACH or TAU process.White list (white list) is exactly the CSG list of the permission UE access set in UE and MME.
LTE all adopts bag (packet) transfer of data, and especially, the user data transmitting between the UE under same eNB/HeNB is all bag data.
Along with the development of HeNB, also in discussion, some household electronic equipments are managed via HeNB.Visible, the UE that belongs to HeNB has the features such as relative position is fixed, between UE generation business is in the majority under same cell.
For some above-mentioned particular conditions, comprise real time transport protocol (RTP, Real-time TransportProtocol) message data such as message data, while being transmitted between the UE under same HeNB, still to pass through EPC, this has just reduced the data transmission efficiency between UE, has also strengthened the processing load of EPC.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of transmission method and device of packet data convergence protocol data, supports the immediate data transmission of two users' terminal under same base station, has greatly alleviated network burden.
For achieving the above object, technical scheme of the present invention is achieved in that
A transmission method for packet data convergence protocol data, comprising:
For local user data loop module corresponding to each packet data polymerized agreement PDCP entity setting up in base station, described base station receive user terminal identification that permission that network side issues directly carries out user data exchange in described base station to after store; And
The PDCP entity of the user terminal in described base station sends described local user data loop module to after receiving the upstream data of described user terminal, described local user data loop module is resolved described upstream data bag, judge whether to meet predetermined policy, directly described upstream data bag is sent to described object local user data loop module if meet described local user data loop module, and under reach the PDCP entity of described object user terminal; Directly be sent to upper network layer if do not meet.
Preferably, described predetermined policy is: the object user terminal of described upstream data bag directly carries out user data exchange in described base station with described permission user terminal identification with the identification information of described user terminal meets this strategy when mating, otherwise does not meet this strategy.
Preferably, the local user data loop module that described PDCP entity is corresponding is set up with the foundation of described PDCP entity, and disappears with the disappearance of described PDCP entity.
Preferably, in described base station, directly to carry out the user data of user data exchange be PDCP data in described permission.
Preferably, described method also comprises:
For described local user data loop module arranges counter, the quantity that described local user data loop module is directly forwarded to the PDCP packet of other local user data loop modules is added up, and reports to network side.
Preferably, described method also comprises:
The user terminal identification that user data exchange is directly carried out in described permission in described base station is when upgrading, notify described base station by network side, the user terminal identification pair that user data exchange is directly carried out in local described permission in described base station is upgraded in described base station.
A transmitting device for packet data convergence protocol data, comprising:
Setting unit, is used to the local user data loop module that in base station, each PDCP entity setting up is corresponding;
Receiving element, the user terminal identification pair that directly carries out user data exchange for receiving permission that network side issues in described base station;
Memory cell, the user terminal identification that directly carries out user data exchange for the permission that described receiving element is received in described base station is to storing;
Local user data loop module, the upstream data bag reporting for receiving and resolve PDCP entity, and judge whether to meet predetermined policy; And
Transmission unit, be used for according to the judged result forwarding uplink data bag of described local user data loop module, if meet the local user data loop module that described upstream data bag is sent to described object user terminal, otherwise by described Packet Generation to upper network layer.
Preferably, described predetermined policy is: the object user terminal of described upstream data bag directly carries out user data exchange in described base station with described permission user terminal identification with the identification information of described user terminal meets this strategy when mating, otherwise does not meet this strategy.
Preferably, the local user data loop module that described PDCP entity is corresponding is set up with the foundation of described PDCP entity, and disappears with the disappearance of described PDCP entity.
Preferably, in described base station, directly to carry out the user data of user data exchange be PDCP data in described permission.
Preferably, described device also comprises:
Counting unit, adds up for the quantity that described local user data loop module is directly forwarded to the PDCP packet of other local user data loop modules, and by transmission unit, statistics is reported to network side.
Preferably, described device also comprises:
Updating block, for receive at described receiving element user terminal identification that new permission that network side issues directly carries out user data exchange in described base station to time, the permission of described base station is directly carried out in described base station to the user terminal identification of user data exchange to upgrading.
In the present invention, in the time that two users' terminal of specified data transmission is arranged in same base station, if the identification information that the user terminal identification centering of user data exchange comprises two users' terminal is directly carried out in the permission of storing in base station in described base station, the data of two users' terminal are directly transmitted under this base station, and forward without core net, particularly user has prepay the PDCP data of grouped data flow expense, need not pass through core net.The present invention has alleviated the transfer of data pressure of core net greatly.
Brief description of the drawings
Fig. 1 is the structural representation that includes the LTE of HeNB;
Fig. 2 is LTE user data transmission protocol data structure and transfer of data schematic diagram;
Fig. 3 is the transmission method flow chart of packet data convergence protocol data of the present invention;
Fig. 4 is user data transmission protocol data structure of the present invention and transfer of data schematic diagram;
Fig. 5 is the composition structural representation of the transmitting device of packet data convergence protocol data of the present invention.
Embodiment
Basic thought of the present invention is: in the time that two users' terminal of specified data transmission is arranged in same base station, if the identification information that the user terminal identification centering of user data exchange comprises two users' terminal is directly carried out in the permission of storing in base station in described base station, the data of two users' terminal are directly transmitted under this base station, and forward without core net, particularly user has prepay the PDCP data of grouped data flow expense, need not pass through core net.The present invention has alleviated the transfer of data pressure of core net greatly.
For making the object, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
Fig. 3 is the transmission method flow chart of packet data convergence protocol data of the present invention, as shown in Figure 3, for simplicity's sake, has only drawn main signaling message in figure, and has ignored the situation of each link establishment.On PDCP layer in eNB/HeNB, increase a local user data loop module, this local user data loop module is set up with the foundation of PDCP entity, disappearance with PDCP entity disappears, and the user data on DPCP entity and upper strata all passes through this local user data loop module alternately.The transmission method of packet data convergence protocol data of the present invention comprises the following steps:
Step 301:EPC sends Indication message to eNB/HeNB, and message is used to indicate user data in community and forwards, and qualified two users' terminal accesses while carrying out transfer of data in same base station, will be directly that two users' terminal is carried out transfer of data by this base station.This message can be used as Non-Access Stratum (NAS, NonAccess Stratum) message and sends, and message includes: the UE ID couple that allows end user's exchanges data in eNB/HeNB.
Step 302:eNB/HeNB storage UE ID is to the UE ID of end user's exchanges data in eNB/HeNB (allow to).UE ID plays a part the addressing of data destination.UE ID is to for identifying when the both sides of transfer of data and UE ID are when mating, and the data between user will no longer be uploaded to EPC, but directly transmit the data between two UE by this eNB/HeNB.
Step 303:UEA sends user data, and destination address is to UEB.For example, user data is a RTP message bag, belongs to a data uplink process.
UEA to the packaged type of data to be transmitted referring to the associated description in the flow processs of data " the PDCP entity transmit " in " background technology ".
Local user data loop module in step 304:eNB/HeNB judges that user data type can directly forward.The PDCP entity of setting up for UEA in eNB/HeNB receives after the upstream data bag of UEA, is forwarded to the local user data loop module of setting up for UEA.Local user data loop module is resolved upstream data bag, obtain the information such as source IP address (UEA mark) in upstream data bag, object IP address (UEB mark) and corresponding port numbers, call the UE ID couple of end user's exchanges data in the permission eNB/HeNB storing in eNB/HeNB, determine with UEA mark and UEB mark and whether mate, if coupling, means that eNB/HeNB can directly transmit data between UEA and UEB.Or the terminal iidentification issuing with network side except terminal identification information is to mating, in base station, the port address of transfer of data also must mate with the port address of setting.Or the terminal iidentification issuing with network side except terminal identification information is to mating, the size of two terminal transmission data can not exceed and setting data amount.
Step 305:eNB/HeNB directly sends to UEB UEA user data.
While allowing directly transmission, the local user data loop module of UEA is no longer delivered upper strata user data, but the message bag of directly the PDCP entity of receiving being sent, transfer to (UEB) local user data loop module of UE ID to correspondence, by the local user data loop module of UEB, data are passed to the PDCP entity of the lower floor of UEB, send to object UE (UEB's) through PDCP entity and lower floor (RLC); If do not allow direct transmission, local user data loop module transfers to upper strata to process user data.
Here, other of PDCP entity remains unchanged as fail safe (encrypting and decrypting, integrity checking etc.), heading compression function.
It should be noted that, because data between UEA and UEB directly forward by eNB/HeNB, even for having paid the user of data traffic expense, some operators, for being also unacceptable without network side completely, are directed to this, and counter can be set, in the time that local user data loop module is passed through the direct forwarding data bag of eNB/HeNB, the quantity of the up-downgoing packet to transmission is added up, and reports upper strata, and network side carries out traffic statistics according to the quantity of packet.
Step 306: this flow process, corresponding is that the user data genus that UEA sends is not directly forwarded to UEB by eNB/HeNB, is designated as packet packet_rr, for UEA is to the user data of UEB.
After the data of the local user data loop module flow process on receiving in step 307:eNB/HeNB, according to local judgment criterion, judge that the user data type of packet_rr does not belong to the data that can directly forward in community.The process of judgement is referring to step 304.
Step 308:eNB/HeNB sends to EPC packet packet_rr.
What this process adopted is present technology, and, as there is no local user data loop functions of modules, data message bag is submitted to upper strata through PDCP.
Step 309:EPC sends to eNB/HeNB packet packet_rr.
Step 310:eNB/HeNB sends to UEB packet packet_rr.
What step 309,310 process adopted is present technology, as there is no local user data loop functions of modules.
Fig. 4 is user data transmission protocol data structure of the present invention and transfer of data schematic diagram, as shown in Figure 4, user data transmission protocol data structure of the present invention is identical with the data structure shown in Fig. 2, but its transmission means is different: i.e. the UEID couple to the permission of having been indicated by EPC end user's exchanges data in eNB/HeNB, directly by eNB, the upstream data of UEA is transmitted to UEB, observe from protocol layer, the PDCP PDU of UEA has arrived UEB through eNB, without the transmission through gateway (GW) and business service network.
The present invention has realized the method at PDCP sublayer transmitting user data, improved user data transmission speed, and alleviated the processing pressure of core net, and on other sublayer as the not impact such as MAC, RLC, also not needing increases extra physical entity, realizes cost lower.
Fig. 5 is the composition structural representation of the transmitting device of packet data convergence protocol data of the present invention, as shown in Figure 5, the transmitting device of packet data convergence protocol data of the present invention comprises setting unit 50, receiving element 51, memory cell 52, local user data loop module 53 and transmission unit 54, wherein, setting unit 50 is used to the local user data loop module 53 that in base station, each PDCP entity setting up is corresponding; The user terminal identification pair that receiving element 51 directly carries out user data exchange for the permission that receives network side and issue in described base station; The user terminal identification that memory cell 52 is directly carried out user data exchange for the permission that receiving element 51 is received in described base station is to storing; The upstream data bag that local user data loop module 53 reports for receiving and resolve PDCP entity, and judge whether to meet predetermined policy; Wherein, predetermined policy is: the object user terminal of described upstream data bag directly carries out user data exchange in described base station with described permission user terminal identification with the identification information of described user terminal meets this strategy when mating, otherwise does not meet this strategy.Or predetermined policy is: the terminal iidentification issuing with network side except terminal identification information is to mating, and in base station, the port address of transfer of data also must mate with the port address of setting.Or predetermined policy is: the terminal iidentification issuing with network side except terminal identification information is to mating, and the size of two terminal transmission data can not exceed and setting data amount.The local user data loop module 53 that described PDCP entity is corresponding is set up with the foundation of described PDCP entity, and disappears with the disappearance of described PDCP entity.Transmission unit 54 is for according to the judged result forwarding uplink data bag of local user data loop module 53, if met, described upstream data bag is sent to the local user data loop module of described object user terminal, otherwise by described Packet Generation to upper network layer.The user data that user data exchange is directly carried out in permission in described base station is PDCP data.
As shown in Figure 5, the transmitting device of packet data convergence protocol data of the present invention also comprises counting unit 55, add up for the quantity that local user data loop module 53 is directly forwarded to the PDCP packet of other local user data loop modules, and by transmission unit 54, statistics is reported to network side.
As shown in Figure 5, the transmitting device of packet data convergence protocol data of the present invention also comprises updating block 56, for receive at receiving element 51 user terminal identification that new permission that network side issues directly carries out user data exchange in described base station to time, the permission of described base station is directly carried out in described base station to the user terminal identification of user data exchange to upgrading.
It will be appreciated by those skilled in the art that counting unit 55 in Fig. 5 and updating block 56 not realize the essential features of the transmitting device of the packet data convergence protocol data shown in Fig. 5, but optimize Fig. 5 shown device and the technical characterictic that adopts.
Those skilled in the art are to be understood that, the transmitting device of the packet data convergence protocol data shown in Fig. 5 is that the transmission method for realizing aforesaid packet data convergence protocol data arranges, and the each processing unit in figure and the practical function of processing module can be understood with reference to the associated description of preceding method.In device shown in Fig. 5, the function of each unit and each module can realize by the program running on processor, also can realize by concrete logical circuit, as the counting unit 55 in figure realizes by digit counter, memory cell 52 realizes by memory.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.

Claims (10)

1. a transmission method for packet data convergence protocol data, is characterized in that, comprising:
For local user data loop module corresponding to each packet data polymerized agreement PDCP entity setting up in base station, described base station receive user terminal identification that permission that network side issues directly carries out user data exchange in described base station to after store; And
The PDCP entity of the user terminal in described base station sends described local user data loop module to after receiving the upstream data of described user terminal, described local user data loop module is resolved described upstream data bag, judge whether to meet predetermined policy, directly described upstream data bag is sent to object local user data loop module if meet described local user data loop module, and under reach the described PDCP entity of object user terminal; Directly be sent to upper network layer if do not meet;
Wherein, the local user data loop module that described PDCP entity is corresponding is set up with the foundation of described PDCP entity, and disappears with the disappearance of described PDCP entity.
2. method according to claim 1, it is characterized in that, described predetermined policy is: the object user terminal of described upstream data bag directly carries out user data exchange in described base station with described permission user terminal identification with the identification information of described user terminal meets this strategy when mating, otherwise does not meet this strategy.
3. according to the method described in claim 1 or 2, it is characterized in that, the user data that user data exchange is directly carried out in described permission in described base station is PDCP data.
4. method according to claim 3, is characterized in that, described method also comprises:
For described local user data loop module arranges counter, the quantity that described local user data loop module is directly forwarded to the PDCP packet of other local user data loop modules is added up, and reports to network side.
5. method according to claim 1, is characterized in that, described method also comprises:
The user terminal identification that user data exchange is directly carried out in described permission in described base station is when upgrading, notify described base station by network side, the user terminal identification pair that user data exchange is directly carried out in local described permission in described base station is upgraded in described base station.
6. a transmitting device for packet data convergence protocol data, is characterized in that, comprising:
Setting unit, is used to the local user data loop module that in base station, each PDCP entity setting up is corresponding; Wherein, the local user data loop module that described PDCP entity is corresponding is set up with the foundation of described PDCP entity, and disappears with the disappearance of described PDCP entity;
Receiving element, the user terminal identification pair that directly carries out user data exchange for receiving permission that network side issues in described base station;
Memory cell, the user terminal identification that directly carries out user data exchange for the permission that described receiving element is received in described base station is to storing;
Local user data loop module, the upstream data bag reporting for receiving and resolve PDCP entity, and judge whether to meet predetermined policy; And
Transmission unit, be used for according to the judged result forwarding uplink data bag of described local user data loop module, if meet the described local user data loop module that described upstream data bag is sent to object user terminal, otherwise by described Packet Generation to upper network layer.
7. device according to claim 6, it is characterized in that, described predetermined policy is: the object user terminal of described upstream data bag directly carries out user data exchange in described base station with described permission user terminal identification with the identification information of described user terminal meets this strategy when mating, otherwise does not meet this strategy.
8. according to the device described in claim 6 or 7, it is characterized in that, the user data that user data exchange is directly carried out in described permission in described base station is PDCP data.
9. device according to claim 8, is characterized in that, described device also comprises:
Counting unit, adds up for the quantity that described local user data loop module is directly forwarded to the PDCP packet of other local user data loop modules, and by transmission unit, statistics is reported to network side.
10. device according to claim 6, is characterized in that, described device also comprises:
Updating block, for receive at described receiving element user terminal identification that new permission that network side issues directly carries out user data exchange in described base station to time, the permission of described base station is directly carried out in described base station to the user terminal identification of user data exchange to upgrading.
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