WO2006058501A1 - Systeme destine a mettre en oeuvre une fonction de protocole de convergence de paquets de donnees et procede associe - Google Patents

Systeme destine a mettre en oeuvre une fonction de protocole de convergence de paquets de donnees et procede associe Download PDF

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Publication number
WO2006058501A1
WO2006058501A1 PCT/CN2005/002075 CN2005002075W WO2006058501A1 WO 2006058501 A1 WO2006058501 A1 WO 2006058501A1 CN 2005002075 W CN2005002075 W CN 2005002075W WO 2006058501 A1 WO2006058501 A1 WO 2006058501A1
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Prior art keywords
pdcp
pdu
data packet
entity
pdcp entity
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PCT/CN2005/002075
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English (en)
Chinese (zh)
Inventor
Bing Xu
Jiayi Zhang
Sihong Zhou
Xingang Liang
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Huawei Technologies Co., Ltd.
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Publication of WO2006058501A1 publication Critical patent/WO2006058501A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/04—Protocols for data compression, e.g. ROHC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation

Definitions

  • the present invention relates to techniques for processing radio interface protocols in Universal Mobile Telecommunications System (UMTS), and more particularly to a system and method for implementing Packet Data Aggregation Protocol (PDCP) functionality in UMTS.
  • UMTS Universal Mobile Telecommunications System
  • PDCP Packet Data Aggregation Protocol
  • the standards based on the third generation mobile communication system mainly include the wideband code division multiple access (WCDMA) communication system, the code division multiple access (CDMA) 2000 communication system, and the TD-SCDMA communication system.
  • WCDMA wideband code division multiple access
  • CDMA code division multiple access 2000 communication system
  • TD-SCDMA TD-SCDMA
  • UMTS is a third generation mobile communication system using WCDMA air interface technology, and UMTS is also commonly referred to as a WCDMA communication system.
  • the structure of the UMTS is as shown in FIG. 1: It includes a User Equipment (UE), a Radio Access Network (RAN), and a Core Network (CN).
  • the RAN is used to handle all wireless related functions, while the CN handles all voice calls and data connections within the UMTS and enables switching and routing functions with external networks.
  • CN is divided into the circuit switched domain (CS, Circuit Switched Domain) domain and a packet switched logically (PS, Packet Switched Domain) 0
  • the structure of the RAN is shown in Figure 2.
  • the RAN contains one or several Radio Network Subsystems (RNS).
  • An RNS consists of a Radio Network Controller (RNC) and one or more base stations Node B.
  • the interface between the RNC and the CN is the Iu interface, and the Node B and the RNC are connected through the Iub interface.
  • R Cs are interconnected through the Iur interface, and the RNC can be divided into a source RNC (SRNC) and a target RNC (TRNC) for the UE.
  • SRNC source RNC
  • TRNC target RNC
  • radio interface protocols are included in the radio interface protocol stack architecture between the UE and the CN.
  • the radio interface protocol stack between the UE and the CN is shown in Figure 3: where PDCP is for PS
  • the domain service completes the header compression/decompression function, in order to save the wireless bandwidth resources of the wireless interface between the UE and the CN, and improve the efficiency of transmitting data.
  • the PDCP entities are respectively set in the UE and the RAN, and may be set to one or more, each PDCP entity uses several header compression/decompression algorithms, and different PDCP entities may include the same header compression/decompression algorithm, thereby A variety of different types of header compression/decompression algorithms are established in the PS domain.
  • the functions of the PDCP entity include: performing header compression/decompression of the data packet in the UE and the RAN respectively; transmitting user data, and forwarding the PDCP protocol data unit (PDCP-PDU) generated by the data packet to the Radio Link Control (RLC) layer
  • PDCP-PDU PDCP protocol data unit
  • RLC Radio Link Control
  • SR S Service Radio Network Subsystem
  • the sequence number corresponding to the data packet it maintains and the buffered data packet are forwarded to TR in the RAN.
  • the PDCP entity is placed in the RNC of the RAN.
  • the header compression/decompression function of the PDCP entity can be used. The specific steps are as shown in FIG. 4:
  • Step 400 In the UE, the application layer of the UE encapsulates the data into an Internet Protocol (IP) data packet or a Point-to-Point Protocol (PPP) data packet and sends the data to the PDCP entity in the UE.
  • IP Internet Protocol
  • PGP Point-to-Point Protocol
  • Step 401 The PDCP entity in the UE performs header compression on the data packet by using the PDCP, generates a PDCP-PDU, and transmits the PDCP-PDU to the RLC layer in the UE.
  • Step 402 The RLC layer in the UE adds an RLC header to the received PDCP-PDU and sends it to the Medium Access Control (MAC) layer in the UE.
  • MAC Medium Access Control
  • Step 403 The MAC layer in the UE adds a MAC header to the PDCP-PDU that has been added with the RLC header and sends the MAC header to the physical layer of the UE.
  • Step 404 The physical layer of the UE performs coding and modulation on the received PDCP-PDU with the added RLC header and the MAC header, and sends the operation to the Node B accessed by the UE.
  • the Node B encodes and demodulates the PDCP-PDU. Operate and send to the MAC layer in the RNC.
  • Step 405 The MAC layer in the RNC removes the MAC of the PDCP-PDU from the Node B. The header sends the PDCP-PDU after removing the MAC header to the RLC layer in the RNC.
  • Step 406 The RLC layer in the RNC removes the RLC header of the received PDCP-PDU, and sends the PDCP-PDU with the removed MAC header and the RLC header to the PDCP entity in the RC.
  • the PDCP entity applies the PDCP to the PDCP-PDU header. Decompress, generate IP packets or PPP packets.
  • Step 407 The RC sends the generated data packet to the General Packet Radio Service System Gateway Support Node (SGSN) in the CN through the General Packet Radio Service System Tunneling Protocol-User Plane (GTP-U) tunnel via the Iu interface, and the SGSN
  • the received data packet is sent to the general packet radio service system service support node (GGSN) in the CN through the Gn interface through the GTP interface, and the GGSN sends the received data packet to the external network.
  • GGSN general packet radio service system service support node
  • Figure 4 illustrates the process of transmitting a data packet from the UE to the external network, that is, the process of transmitting the data packet upstream.
  • the process of sending a data packet from the external network to the UE, that is, the process of transmitting the data packet in the downlink is similar to the process of transmitting the data packet in the uplink, except that the PDCP entity in the RNC is responsible for performing PDCP header compression on the downlink data packet to form a PDCP-PDU, and the UE The PDCP entity is responsible for header decompression of the received PDCP-PDU.
  • the PDCP entities are respectively set in the RNC and the UE, and the header compression/decompression technology is applied to save the bandwidth of the transmission link between the RAN and the UE, and improve the data transmission efficiency of the wireless interface, but is transmitted between the RAN and the CN.
  • the uplink data and the downlink data are still transmitted in the form of data packets, and the header of the data packet is not compressed. This occupies a large amount of bandwidth resources of the transmission link between the RAN and the CN, and reduces the data transmission efficiency between the RAN and the CN.
  • the RNC of the UE initially registered area is the SRNC
  • the RNC to which the area to which the UE moves is TRNC.
  • the UE's SRNC sometimes performs lossless migration, which is called SRNS lossless migration.
  • the PDCP entity in the SRNC forwards the sequence number corresponding to the data packet it maintains to TRNC.
  • the packet is a downlink data packet that the SRNC has sent to the UE, and the sequence number corresponding to the data packet is used to mark those data packets that are sent out by the SR C and that are not received by the UE.
  • the PDCP entity in the SRNC In order to determine whether the transmitted data packet has been received by the UE after the SRNS lossless migration, the PDCP entity in the SRNC must forward the sequence number corresponding to the data packet it maintains to the TRNC.
  • the process is as follows: The PDCP entity in the SRNC sends the sequence number corresponding to the data packet it maintains to the PDCP entity in the TRNC through the lur interface.
  • the SRNC cannot control the external network to send downlink data packets to the UE through the CN. Therefore, the received downlink data packet must be buffered to a preset buffer area and sent to the TRNC to ensure TRNC. It is possible to determine which data packets are not received by the UE based on the packet sequence number from the PDCP entity in the SRNC, and retransmit the data packets that are not received by the UE.
  • the SRNS Since there is no data transmission link between the SRNS and the TRNC, the SRNS sends the buffered downlink data packet to the TRNC.
  • the SRNC sends the buffered downlink data packet to the CN through the Iu interface, and the CN then uses the Iu interface to downlink the data.
  • the package is sent to TRNC. It can be seen that this occupies a large amount of bandwidth resources of the transmission link between the RAN and the CN, and reduces the data transmission efficiency between the RAN and the CN. Summary of the invention
  • the main object of the present invention is to provide a system for implementing a PDCP function, which can save bandwidth resources of a transmission link between a RAN and a CN when transmitting a data packet, and improve data transmission efficiency between the RAN and the CN. .
  • Another object of the present invention is to provide a method for implementing a PDCP function, which can save bandwidth resources of a transmission link between a RAN and a CN when transmitting a data packet, and improve data transmission efficiency between the RAN and the CN.
  • Still another object of the present invention is to provide a PDCP function in a non-destructive migration process.
  • the energy method can save the bandwidth resource of the transmission link between the RAN and the CN when transmitting the data packet, and improve the data transmission efficiency between the RAN and the CN.
  • the present invention discloses a system for implementing a packet data aggregation protocol (PDCP) function, including a user equipment UE having a PDCP entity, the system further comprising a radio access network side device and a core network CN, and the CN is provided with a PDCP entity pair in the UE.
  • PDCP packet data aggregation protocol
  • the UE is configured to perform a header compression on the data packet by the PDCP entity to generate a PDCP protocol data unit PDCP-PDU, and send the generated PDCP-PDU to the CN through the wireless access network side device; and access the network side device through the wireless access network Receiving a PDCP-PDU from the CN, and decompressing the received PDCP-PDU through the PDCP entity of the UE to obtain a data packet;
  • CN configured to receive a PDCP-PDU from the UE by using a radio access network side device, and obtain a data packet by performing a 4-head decompression by the PDCP entity of the CN; and obtaining a data packet by the PDCP entity of the CN
  • the header compression/decompression algorithm of the PDCP entity in the CN is the same as the header compression/decompression algorithm of the PDCP entity in the UE.
  • the PDCP entity in the CN is set in the CN's General Packet Radio Service System Service Support Node GGSN, or in the CN's General Packet Radio Service System Gateway Support Node SGSN.
  • the cache area is configured in the CN, and is used to cache the PDCP-PDU sent by the source radio network controller (SRNC) of the radio access network side device to the UE when performing the lossless migration, and the UE has not received and cached when the lossless migration is completed.
  • the PDCP-PDU is sent to the UE.
  • the PDCP entity in the CN is set in the Internet Protocol Access Gateway IAGW of the CN.
  • a cache area is set in the CN for caching the source edge wireless station during lossless migration.
  • the SERS sends the PDCP-PDU to the UE, and sends the PDCP-PDU that the UE has not received and buffered to the UE when the lossless migration is completed.
  • the invention also discloses a method for implementing a PDCP function, the method comprising:
  • the transmitting end of the data packet performs PDCP header compression to obtain a PDCP-PDU, and the obtained PDCP-PDU is sent to the receiving end of the data packet through the radio access network side device;
  • the receiving end of the data packet decompresses the received PDCP-PDU by the PDCP header to obtain a data packet.
  • the transmitting end of the data packet is a UE, and the receiving end of the data packet is a CN.
  • the receiving end of the data packet is a GGSN or an SGSN in the CN.
  • the transmitting end of the data packet is CN, and the receiving end of the data packet is a UE.
  • the transmitting end of the data packet is a GGSN or an SGSN in the CN.
  • the transmitting end of the data packet is a UE/IAGW
  • the receiving end of the data packet is an IAGW/UE.
  • the invention also discloses a method for implementing a PDCP function during lossless migration, setting a PDCP entity in the CN, and setting a buffer area; the method includes:
  • the PDCP entity set in the CN saves the PDCP-PDU that the CN has sent to the UE but is not received by the UE in the cache area;
  • the PDCP entity in the CN obtains the PDCP-PDU that the UE has not received from the buffer area, and sends the obtained PDCP-PDU to the A1 in the cache area.
  • the PDCP-PDU is set with a corresponding sequence number.
  • the method for obtaining the PDCP-PDU is:
  • the PDCP entity determines a PDCP-PDU to be retransmitted according to the serial number corresponding to the transmitted PDCP-PDU that is maintained.
  • the PDCP entity in the CN is set in the SGSN, GGSN or IAGW of the CN.
  • the cache area is set on the PDCP entity in the CN. It can be seen from the foregoing solution that the system for implementing the PDCP function provided by the present invention sets the PDCP entity set in the RAN in the prior art in the CN.
  • the method for implementing the PDCP function provided by the present invention implements the PDCP compression/decompression function of the packet header in the UE and the CN in the UMTS system, that is, the transceiver end of the UMTS system, thereby saving the space between the RAN and the CN when transmitting the data packet.
  • the bandwidth resource of the transmission link improves the data transmission efficiency between the RAN and the CN.
  • the cache area is set in the CN, and the downlink data packet that has been sent is buffered into the buffer area; when the lossless migration is completed, the PDCP entity in the CN according to the serial number corresponding to the maintained transmitted PDCP-PDU Determining the PDCP-PDU to be retransmitted, and determining the PDCP-PDU to be retransmitted to the UE, thereby saving the bandwidth resource of the transmission link between the RAN and the CN when transmitting the data packet, improving the relationship between the RAN and the CN Data transfer efficiency.
  • Figure 1 is a structural diagram of UMTS
  • Figure 2 is a structural diagram of the RAN
  • FIG. 3 is a schematic diagram of a radio interface protocol stack between a UE and a CN;
  • FIG. 4 is a flowchart of a method for using a header compression/decompression function of a PDCP entity after a RAB is established in a prior art UE;
  • FIG. 5 is a schematic diagram of a system for implementing a PDCP function according to the present invention.
  • FIG. 6 is a schematic diagram of a system for setting a peer PDCP entity in an SGSN according to the present invention
  • FIG. 8 is a schematic diagram of a system for setting a peer PDCP entity in a GGSN according to the present invention
  • FIG. 8 is a schematic diagram of implementing a PDCP function according to a preferred embodiment of the present invention
  • FIG. 9 is a flowchart of a method for implementing a PDCP function during lossless migration according to a preferred embodiment of the present invention
  • FIG. 10 is a system diagram of a radio access network in a wireless network in the prior art
  • FIG. 11 is a schematic diagram of a radio interface protocol stack between a UE and an IAGW according to the present invention
  • FIG. 12 is a flowchart of implementing a PDCP function according to another preferred embodiment of the present invention
  • FIG. 13 is a non-destructive migration process according to another preferred embodiment of the present invention
  • the PDCP entity set in the AN is set in the CN.
  • the uplink data packet transmitted by the UE to the CN or the downlink data packet transmitted by the CN to the UE can be compressed by the PDCP header at the transmitting end, and the PDCP header is decompressed at the receiving end, so that the transmission between the RAN and the CN is
  • the data packet compressed by the PDCP header saves the bandwidth resource of the transmission link between the RAN and the CN, and improves the efficiency of data transmission between the RAN and the CN.
  • FIG. 5 is a schematic diagram of a system for implementing a PDCP function according to the present invention.
  • the system includes a CN 500, a RAN 501, and a UE 502.
  • the UE 502 is configured with a PDCP entity 503, configured to perform PDCP header compression on the data packet to be sent to generate a PDCP-PDU, and perform PDCP header decompression on the received PDCP-PDU to obtain a data packet.
  • the UE 502 transmits the generated PDCP-PDU to the RAN 501 or receives the PDCP-PDIL from the RAN 501.
  • the RAN 501 is configured to send the PDCP-PDU from the UE to the CN 500, or send the PDCP-PDU from the CN 500 to the UE 502 in the future.
  • a PDCP entity 504 that is peered with the PDCP entity 503 of the UE 502 is provided in the CN 500.
  • the PDCP entity 504 and the PDCP entity 503 are in the same position, and the header compression/decompression algorithm in the PDCP entity 504 and the header compression/decompression algorithm of the PDCP entity 503 are not necessarily all the same.
  • the PDCP entity 504 uses the same header compression/decompression algorithm as the header compression/decompression algorithm of the PDCP entity 503, and performs PDCP header compression on the data packet to be transmitted to generate a PDCP-PDU, which is received.
  • the PDCP-PDU is decompressed by the PDCP header to obtain a data packet.
  • the CN 500 transmits the generated PDCP-PDU to the RAN 501 or receives the PDCP-PDU from the RAN 501.
  • a buffer area is set in an entity such as the PDCP entity 504 of the CN 500 for storing the PDCP-PDIL that has been transmitted.
  • the buffer area is stored.
  • the PDCP entity 504 also maintains the sequence number corresponding to the PDCP-PDU that has been transmitted. After the SRNS lossless migration, the PDCP-PDU sequence number maintained by the PDCP entity 504 determines the PDCP-PDU to be retransmitted. The PDCP-PDU to be retransmitted is obtained from the buffer area and sent to the UE through the TRNC.
  • the method by which the PDCP entity 504 maintains the transmitted PDCP-PDU sequence number is:
  • the PDCP entity 504 stores the sequence number of the PDCP-PDU that has been transmitted and not received by the UE.
  • the PDCP entity 504 of the CN 500 may be placed in the SGSN or GGSN in the CN, as shown in Figures 6 and 7, respectively.
  • One or more PDCP entities may be set in the UE, and each PDCP entity may use several header compression/decompression algorithms, and different PDCP entities may include the same header compression/decompression algorithm, thereby establishing multiple in the PS domain. Different types of header compression/decompression algorithms.
  • one or more peer PDCP entities may also be set correspondingly in the CN.
  • FIG. 8 is a flowchart of a method for implementing a PDCP function according to the present invention.
  • the process includes the following steps: Step 800: The application layer of the UE encapsulates data into an IP data packet or a PPP data packet. Send to the PDCP entity in the UE.
  • Step 801 The PDCP entity in the UE performs header compression on the received data packet by using the PDCP, generates a PDCP-PDU, and transmits the PDCP-PDU to the RLC layer in the UE.
  • Step 802 The RLC layer in the UE adds an RLC header to the received PDCP-PDU and sends it to the MAC layer in the UE.
  • Step 803 The MAC layer in the UE adds a MAC 4 header to the PDCP-PDU that has been added with the RLC header and sends it to the physical layer of the UE.
  • Step 804 The physical layer of the UE performs coding and modulation operations on the PDCP-PDU of the RLC header and the MAC header, and sends the operation to the Node B accessed by the UE.
  • the Node B encodes and demodulates the PDCP-PDU from the UE. After the operation, it is sent to the MAC layer in the RNC.
  • Step 805 The MAC layer in the RNC removes the MAC header of the PDCP-PDU from the Node B.
  • Step 806 The RLC layer in the RNC removes the RLC header of the received PDCP-PDU, and sends the PDCP-PDU with the removed MAC header and the RLC header to the PDCP entity in the CN through the GTP-U tunnel through the Iu interface.
  • Step 807 The PDCP entity in the CN applies the PDCP to decompress the PDCP-PDU to obtain an IP or PPP data packet, and sends the obtained data packet to the external network.
  • FIG. 8 is a process in which a UE sends an uplink data packet to an external network.
  • a process in which an external network sends a downlink data packet to a UE is basically the same as that described in FIG. 8, except that the PDCP entity in the CN is responsible for the external network.
  • the downlink data packet is subjected to PDCP header compression to generate a PDCP-PDU, and the PDCP entity in the UE performs PDCP header decompression on the received PDP-PDU.
  • the process shown in FIG. 9 can be implemented by pre-setting a cache area on the PDCP entity in the CN.
  • the process includes the following steps:
  • Step 900 The SR C sends an SRNS lossless migration request to the PDCP entity in the CN.
  • Step 902 When the SRNS lossless migration is completed, the SRNC sends an SRNS lossless migration complete message to the PDCP entity in the CN.
  • Step 903 When receiving the SRNS lossless migration complete message from the SRNC, the PDCP entity in the CN determines whether to resend the buffered PDCP-PDU according to the maintained PDCP-PDU sequence number, and passes the PDCP-PDU to be retransmitted through the TR C. Send to the UE.
  • the process of determining whether to resend the buffered PDCP-PDU according to the maintained PDCP-PDU sequence number is:
  • the PDCP entity in the CN uses the prior art to determine whether the PDCP-PDU corresponding to the serial number maintained by the UE is received by the UE, if Yes, the PDCP-PDU that has been received by the UE is not required to be retransmitted; otherwise, the PDCP entity in the CN determines to re-transmit the PDCP-PDU that the UE does not receive to the UE.
  • the process of FIG. 9 is performed on the downlink PDCP-PDU that the CN wants to send to the UE, and the process described in FIG. 9 is performed on the uplink PDCP-PDU sent by the UE to the CN, that is, the SRNS is not damaged.
  • the migration process does not affect the UE sending uplink PDCP-PDIL.
  • Figure 10 shows the existing Technology A diagram of a radio access network system in a wireless network.
  • the IP network 1030 is respectively connected to an edge wireless station (ERS) 1040, an ERS 1050, and an ERS 1060 located in the RAN, and the IP network 1030 is also respectively connected to an IP access gateway (IAGW) 1010 and an IAGW 1020 located in the CN;
  • the UE 1070 can access the ERS.
  • the ERS integrates the current base station and the RC, and can implement the function of the RAN that can be implemented by the base station and the RC.
  • the IAGW integrates the SGSN and the GGSN, and can implement the functions of the CN that the SGSN and the GGSN can implement. Moreover, there is no fixed attribution relationship between the ERS and the IAGW, and each ERS can establish a connection with any one or more IAGWs that are not fixed through the IP network 1030.
  • a PDCP entity that is peered with the PDCP entity of the UE 1070 is also provided in the ERS.
  • the data transmission mode between the ERS and the IAGW is the same as that of the foregoing prior art RNC and CN, and is transmitted in a packet mode without a header of the compressed data packet. Therefore, a large amount of bandwidth resources of the transmission link between the ERS and the IAGW are occupied by the data transmitted in the packet mode, so that the data transmission efficiency between the ERS and the IAGW is reduced.
  • the PDCP entity originally set in the ERS can be set in the IAGW, so that the radio interface protocol stack between the UE and the IAGW is as shown in FIG.
  • the uplink data packet transmitted by the UE to the IAGW or the downlink data packet transmitted by the IAGW to the UE may be subjected to PDCP header compression at the transmitting end, and PDCP header decompression is performed at the receiving end.
  • Transmitting between the ERS and the IAGW is a packet compressed by the PDCP header, thereby saving bandwidth resources of the transmission link between the ERS and the IAGW, and improving the efficiency of data transmission between the ERS and the IAGW.
  • FIG. Figure 12 The process is basically the same as the process of Figure 8, including the following steps:
  • Step 1200 The application layer of the UE encapsulates the data into an IP data packet or a PPP data packet and sends the data to the PDCP entity in the UE.
  • Step 1201 The PDCP entity in the UE performs header compression on the data packet by using the PDCP, generates a PDCP-PDU, and transmits the PDCP-PDU to the RLC layer in the UE.
  • Step 1202 The RLC layer in the UE adds an RLC header to the received PDCP-PDU and sends it to the MAC layer of the UE.
  • Step 1203 The MAC layer in the UE adds a MAC header to the PDCP-PDU that has been added with the RLC header, and then sends the MAC header to the physical layer of the UE.
  • Step 1204 The physical layer of the UE sends an ERS that is added to the PDCP-PDU of the RLC header and the MAC header, and then sends the ERS to the ERS.
  • the ERS sends the PDCP-PDU to the ERS.
  • MAC layer The physical layer of the UE sends an ERS that is added to the PDCP-PDU of the RLC header and the MAC header, and then sends the ERS to the ERS.
  • the ERS sends the PDCP-PDU to the ERS.
  • MAC layer The physical layer of the UE sends an ERS that is added to the PDCP-PDU of the RLC header and the MAC header, and then sends the ERS to the ERS.
  • the ERS sends the PDCP-PDU to the ERS.
  • Step 1205 The MAC layer in the ERS removes the MAC header of the PDCP-PDU from the UE, and sends the PDCP-PDU after removing the MAC header to its RLC layer.
  • Step 1206 The RLC layer in the ERS removes the RLC header of the received PDCP-PDU and sends it to the GTP-U layer in the ERS for tunnel encapsulation, and then passes the encapsulated PDCP-PDU through UDP/IP, L2 in the ERS.
  • the L1 layer is sent to the IAGW.
  • Step 1207 The IAGW performs L1, L2, and UDP/IP layer processing on the received PDCP-PDU, and forwards it to its own GTP-U layer for decapsulation, and then forwards it to its own PDCP entity, which decapsulates the PDCP entity.
  • the subsequent PDCP-PDU is decompressed by the header to obtain an IP or PPP data packet, and the obtained data packet is sent to the external network. .
  • FIG. 12 is a process in which a UE sends an uplink data packet to an external network.
  • a process in which an external network sends a downlink data packet to a UE is basically the same as that described in FIG. 12, except that the PDCP entity pair in the IAGW is from an external network.
  • the downlink data packet is subjected to PDCP header compression to generate a PDCP-PDU, and the PDCP entity in the UE receives the received PDP-PDU. Perform PDCP header decompression.
  • the PDCP entity is set in the IAGW, when the UE performs lossless migration from the source edge wireless station (SERS) accessed by the UE to the target edge wireless station (TERS), it is usually necessary to preset the buffer area in the IAGW to ensure that the buffer area is preset. Can still be implemented when performing lossless migration
  • FIG. 13 The flow specifically for implementing the PDCP function is shown in FIG. 13, and the flow shown in FIG. 13 is basically the same as the flow shown in FIG. 9, and includes the following steps:
  • Step 1300 The SERS sends a lossless migration request to the PDCP entity in the IAGW.
  • Step 1302 When the lossless migration is completed, the SERS sends a lossless migration complete message to the PDCP entity in the IAGW.
  • Step 1303 When receiving the lossless migration completion message from the SERS, the PDCP entity in the IAGW determines whether the buffered data packet is retransmitted according to the maintained sequence number, and sends the PDCP-PDU to be retransmitted through the TERS accessed by the UE. Give the UE.
  • the system and method for implementing the PDCP function provided by the present invention can save the bandwidth resource of the transmission link between the RAN/CN as the transmitting end and the CN/RAN as the receiving end, and improve the transmitting end. Data transmission efficiency between the receiving end and the receiving end.
  • the method for implementing the PDCP function in the lossless migration process provided by the present invention can also save the transmission between the RAN/CN as the transmitting end and the CN/RAN as the receiving end. Transmitting bandwidth resources of the link and improving data transmission efficiency between the transmitting end and the receiving end.

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  • Mobile Radio Communication Systems (AREA)

Abstract

Selon l'invention, dans un système destiné à mettre en oeuvre une fonction de protocole de convergence de paquets de données (PDCP) et selon un procédé associé, l'équipement utilisateur (UE) et le réseau central (CN) déterminant l'entité PDCP opposée sont utilisés comme émetteur et récepteur respectifs de paquets de données. L'émetteur compresse l'en-tête PDCP et obtient l'unité de données de protocole PDCP (PDCP-PDU) et l'envoie au récepteur. Le récepteur décompresse l'en-tête de la PDCP-PDU reçue et obtient le paquet de données. L'invention concerne également un procédé destiné à mettre en oeuvre la fonction PDCP lors d'une transmission d'une manière sans perte. L'entité PDCP dans le CN sauvegarde la PDCP-PDU envoyée à l'UE par le CN dans la zone de cache établie. Lorsque la transmission sans perte est terminée, l'entité PDCP dans le CN obtient la PDCP-PDU qui n'a pas été reçue par l'UE en provenance de la zone de cache établie et envoie la PDCP-PDU obtenue à l'UE. Le procédé susmentionné et le système associé peuvent réserver la bande passante de transmission.
PCT/CN2005/002075 2004-12-03 2005-12-02 Systeme destine a mettre en oeuvre une fonction de protocole de convergence de paquets de donnees et procede associe WO2006058501A1 (fr)

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CN 200410096564 CN100518180C (zh) 2004-12-03 2004-12-03 一种实现分组数据聚合协议功能的系统及方法
CN200410096564.6 2004-12-03

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US8660085B2 (en) * 2006-12-04 2014-02-25 Qualcomm Incorporated Methods and apparatus for transferring a mobile device from a source eNB to a target eNB
CN101453749B (zh) * 2007-11-29 2010-06-23 华为技术有限公司 一种实现用户设备迁移的方法、系统及无线网络控制器
CN101965064B (zh) * 2009-07-23 2014-07-16 中兴通讯股份有限公司 分组数据聚合协议数据的传输方法与装置
CN101997660B (zh) * 2009-08-14 2014-11-05 中兴通讯股份有限公司 一种避免上行数据丢失的方法及装置
CN102131234B (zh) 2010-01-18 2013-12-04 华为技术有限公司 Ip数据包的压缩及解压缩方法和装置
CN102348256B (zh) * 2010-07-26 2014-10-08 华为技术有限公司 多个无线接入网聚合系统及其实现方法和接入网网元
EP3338387B1 (fr) * 2015-08-21 2020-09-23 Intel IP Corporation Protocole de convergence de données en paquets pour agrégation de réseau local cellulaire/sans fil
CN106572198B (zh) * 2015-10-13 2020-06-02 华为技术有限公司 媒介访问控制包头压缩方法、装置及系统
WO2017096592A1 (fr) * 2015-12-10 2017-06-15 华为技术有限公司 Procédé et dispositif de traitement de données dans des communications sans fil
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CN1783876A (zh) 2006-06-07

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