WO2007022694A1 - Pile de protocoles utilisateur et procede de transfert sans perte - Google Patents

Pile de protocoles utilisateur et procede de transfert sans perte Download PDF

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Publication number
WO2007022694A1
WO2007022694A1 PCT/CN2006/002045 CN2006002045W WO2007022694A1 WO 2007022694 A1 WO2007022694 A1 WO 2007022694A1 CN 2006002045 W CN2006002045 W CN 2006002045W WO 2007022694 A1 WO2007022694 A1 WO 2007022694A1
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Prior art keywords
layer
nclp
user plane
protocol stack
plane protocol
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PCT/CN2006/002045
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English (en)
Chinese (zh)
Inventor
Xiaolong Guo
Xingang Liang
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Huawei Technologies Co., Ltd.
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Publication of WO2007022694A1 publication Critical patent/WO2007022694A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H04L63/0272—Virtual private networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/16—Implementing security features at a particular protocol layer
    • H04L63/162—Implementing security features at a particular protocol layer at the data link layer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/16—Implementing security features at a particular protocol layer
    • H04L63/164—Implementing security features at a particular protocol layer at the network layer

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a user plane protocol stack and a lossless migration implementation method in a time-based network using a two-layer node structure. Background technique
  • LTE Long Term Evolution
  • the purpose of LTE is to provide a low-cost network that can reduce latency, increase user data rate, and improve system capacity and coverage. Only the PS domain service is used, and the bearer network is an IP bearer. LTE proposes the following objectives:
  • MBMS multicast and broadcast service
  • a more popular network architecture is a two-tier node architecture, as shown in Figure 1.
  • ERS Electronic Radio Station
  • Node B Base Station
  • RNC Radio Network Controller
  • IAGW IP Access GateWay, IP Access Gateway
  • SGSN Serving GPRS Support Node
  • GGSN Gateway GPRS Support Node
  • the user plane protocol stack of the evolved architecture network of the Layer 2 node is as shown in FIG. 2, and includes a UE user plane protocol stack, an ERS user plane protocol stack, and an IAGW user plane protocol stack.
  • the IAGW user plane protocol stack includes: GPRS Tunneling Protocol User Plane (GTP-U) layer, User Datagram Protocol/Internet Protocol Layer (UDP/IP), L2 layer and L1 layer.
  • GTP-U GPRS Tunneling Protocol User Plane
  • UDP/IP User Datagram Protocol/Internet Protocol Layer
  • L2 layer L1 layer.
  • the ERS user plane protocol stack includes a radio interface protocol stack and Iu, an interface protocol stack.
  • the radio interface protocol stack includes: a packet data convergence protocol layer (PDCP layer), a radio link control protocol layer (RLC layer), a medium access control layer (MAC layer), a physical layer ( ⁇ ' layer); Iu, an interface protocol stack Including: GTP-U layer, UDP/IP layer, L2 layer and L1 layer.
  • PDCP layer packet data convergence protocol layer
  • RLC layer radio link control protocol layer
  • MAC layer medium access control layer
  • ⁇ ' layer physical layer
  • Iu an interface protocol stack Including: GTP-U layer, UDP/IP layer, L2 layer and L1 layer.
  • the UE user plane protocol stack includes: a PDCP layer, an RLC layer, a MAC layer, and a PHY layer.
  • the above L2 layer refers to layer 2 in the layered protocol, that is, a data link layer, such as a frame relay, ATM, or a wireless data link layer.
  • the above L1 layer refers to layer 1 in the layered protocol, that is, physical layer, such as physical layer technologies such as El, optical fiber, and microwave transmission.
  • N-PDU protocol data unit sequence buffered in the source ERS (SERS) must be transferred in the lossless migration.
  • the number may also be transferred to the context of the header compression ( Context ).
  • the present invention provides a user plane protocol stack and a lossless migration implementation method, which are used to solve the problem that the PDCP serial number and data need to be frequently transferred during the lossless migration process in the prior art, and the migration process is complicated.
  • the user plane protocol stack provided by the present invention is applied to an evolved network of a two-layer node architecture, including an IP access gateway IAGW user plane protocol stack, an edge radio base station ERS user plane protocol stack, and a user terminal UE user plane protocol search;
  • the ERS-oriented user plane protocol stack in the IAGW includes: GPRS P-channel protocol user plane GTP-U layer, user datagram protocol/internet protocol layer UDP/IP layer, L2 layer and L1 layer;
  • the user plane protocol stack for the IAGW in the ERS includes: a GTP-U layer, a UDP/IP layer, an L2 layer, and an L1 layer;
  • the user plane protocol stack of the UE-oriented air interface protocol stack of the IAGW further includes: a new aggregation layer protocol NCLP layer, which implements a packet data aggregation protocol PDCP layer header compression function;
  • the user plane protocol stack of the ERS UE-oriented air interface protocol stack further includes: an enhanced radio link control protocol layer, an enhanced medium access control layer, and an enhanced physical layer;
  • the user plane protocol stack of the network-oriented air interface protocol stack of the UE includes: the NCLP layer, an enhanced radio link control protocol layer, an enhanced medium access control layer, and an enhanced physical layer.
  • the enhanced radio link control protocol layer includes segmentation, reassembly, concatenation, padding, user data transmission, error detection, sequential transmission of higher layer protocol data unit PDU, replica detection, flow control, non-confirmation data transmission mode sequence number check, Protocol error detection and recovery, encryption, suspend and resume functions, scheduling, automatic repeat request ARQ, hybrid automatic repeat request HARQ, or any combination thereof;
  • the enhanced medium access control layer includes a mapping between a logical channel and a transport channel, selecting an appropriate transport format for each transport channel, prioritizing between UE data streams, and adopting a dynamic pre-arrangement method between UEs.
  • Priority processing priority processing between data streams of multiple users on the downlink shared channel DSCH and the forward access channel FACH, identification of UEs on the common transport channel, multiplexing of higher layer PDUs to the physical layer through the transport channel Transport block, multiplexes the transport block from the physical layer through the transport channel to a higher layer PDU, traffic detection, dynamic transmission channel type switching, transparent
  • the line link controls one of encryption and access service level selection, scheduling, ARQ, HARQ or any combination thereof;
  • the enhanced physical layer includes one of a spreading/despreading, a modulation/demodulation function, a multiple input multiple output MIMO, an orthogonal frequency division multiplexing OFDM function, or any combination of functions.
  • the enhanced radio link control protocol layer and the enhanced medium access control layer are combined into a new layer.
  • the NCLP protocol layer also includes the functionality of encryption and consistency protection.
  • the method for implementing the lossless migration provided by the present invention uses the user plane protocol stack provided by the present invention.
  • the method includes:
  • the buffer needs to be sent to the opposite end of the NCLP data packet, and the NCLP serial number is set, and the NCLP data packet carrying the serial number is forwarded to the opposite end through the ERS;
  • the local end After receiving the acknowledgment packet sent by the peer, the local end deletes the NCLP packet corresponding to the confirmed sequence number buffered by the local end.
  • the enhanced radio link control protocol layer in the UE user plane protocol stack finds that the data packet is not successfully sent, the inter-layer signaling is indicated.
  • the NCLP layer in the UE retransmits the data packet;
  • the IAGW transmitting the NCLP data packet to the UE, if the enhanced radio link control protocol layer in the ERS user plane protocol stack finds that the data packet is not successfully forwarded, the IAGW is notified to resend the NCLP layer in the user plane protocol stack. Cached unacknowledged packets.
  • the sliding window technology can be used to control the traffic sent by the UE or IAGW to the peer NCLP packet.
  • the UE and the NCLP layer in the IAGW user plane protocol stack transmit the buffered NCLP data packet corresponding to the unacknowledged sequence number to the opposite end.
  • the NCLP data packet is discarded; and an acknowledgment data packet is sent to the opposite end.
  • the NCLP layer transmits the NCLP packet corresponding to the unacknowledged sequence number of the buffer, the NCLP packet is forwarded by the migrated new ERS.
  • the acknowledgment data packet is sent to the peer end through a separate acknowledgment message; or the acknowledgment data packet is sent to the peer end through other data packets sent to the peer end.
  • the NCLP layer in the IAGW user plane protocol stack further performs segmentation processing on the data packets received by the upper layer so that the data packets transmitted to the GTP-U layer do not exceed the maximum packet length allowed.
  • the NCLP layer when the non-answer mode or the transparent mode is selected for data transmission, the NCLP layer does not have to carry the NCLP sequence number in the transmitted NCLP packet.
  • the GTP-U layer when the user data of the GTP-U layer is the data of the guaranteed sequence, if the non-acknowledge mode or the transparent mode is selected for data transmission, the GTP-U layer adds the layer serial number to the transmission data packet. send.
  • the NCLP serial number is maintained at the IAGW for header compression.
  • Iu interface transmission
  • the IAGW Since the IAGW maintains the NCLP data packet and the IAGW understands the transmission and reception of the NCLP data, the ERS does not have to use the data traffic report. In the case of multi-rate, the IAGW can perform real-time charging, which solves the multi-rate charging in the prior art. More difficult problems.
  • the user plane protocol stack provided by the present invention can easily support MAC, layer and RLC, layer merging.
  • Figure 1 is a schematic diagram of an evolved network of a two-layer node architecture
  • 2 is a user plane protocol stack of a two-layer node architecture evolution network in the prior art
  • FIG. 3 is a schematic structural diagram of a user plane protocol stack according to the present invention. detailed description
  • FIG. 3 is a schematic structural diagram of a user plane protocol stack according to the present invention, including a UE user plane protocol stack, an ERS user plane protocol stack, and an IAGW user plane protocol stack.
  • the IAGW user plane protocol stack includes: a GTP-U layer, an UP/IP layer, an L2 layer, and an L1 layer, and also includes a newly added ten-layer NCLP (New Converge Layer Procotol), which is a new aggregation layer protocol.
  • NCLP New Converge Layer Procotol
  • the protocol layer has similar functions to the PDCP protocol layer in the prior art, performs header compression, maintains the NCLP PDU (Protocol Data Unit) sequence number, and performs data transfer in lossless migration because the IAGW acts as a fixed anchor point to solve the lossless problem by the present invention. No longer needed, in addition, the NCLP layer can have segmented functionality and encryption and consistency protection.
  • the ERS user plane protocol stack includes a wireless interface user plane protocol stack and an Iu' interface user plane protocol stack.
  • the radio interface user plane association stack includes: an enhanced radio link control protocol layer (RLC, layer), an enhanced medium access control layer (MAC layer), an enhanced physical layer ( ⁇ ' layer); Iu, interface
  • the user plane protocol stack includes: GTP-U layer, UDP/IP layer, L2 layer, and L1 layer, which does not include the PDCP protocol layer in the prior art ERS protocol stack (upward the related functions of the original PDCP protocol layer to this The NCLP layer implementation in the inventive IAGW user plane protocol stack).
  • the UE user plane protocol stack includes: RLC, layer, MAC, layer and PHY, layer, and the newly added NCLP protocol layer of the present invention replaces the original PDCP protocol layer.
  • the enhanced radio link control protocol layer supports three data transmission modes, namely: an answer mode (AM), a non-acknowledge mode (UM), and a transparent mode (TM); its functions include: segmentation , reassembly, concatenation, padding, user data transfer, error detection, sequential transmission of higher layer protocol data units (PDUs), replica detection, flow control, unconfirmed data transfer mode sequence number checking, protocol error detection and recovery, encryption, hangs, and Recovery function, etc.
  • the enhanced medium access control layer has MAC-d (MAC-dedicated), MAC-c/sh (MAC-Public/Shared), MAC-b (MAC-Broadcast), MAC-hs (MAC-High Speed) entity, whose functions include mapping between logical channels and transport channels, selecting the appropriate transport format for each transport channel, prioritizing between user terminal (UE) data streams, and using between UEs Priority processing of the pre-arrangement method, priority processing between data streams of multiple users on the downlink shared channel (DSCH) and forward access channel (FACH), identification of UEs on the common transport channel, complex PDUs Connected to the transport block transmitted to the physical layer through the transport channel, multiplex the transport block from the physical layer through the transport channel to the upper layer PDU, traffic detection, dynamic transport channel type switching, transparent radio link control (RLC) encryption and connection Enter the service level selection function, HARQ (Hybrid Automatic Repeat Request), and so on.
  • MAC-d MAC-dedicated
  • MAC-c/sh MAC
  • MAC Access Management Function
  • RLC Radio Link Control Function
  • ARQ Automatic Repeat Request
  • HARQ Hybrid Automatic Repeat Request
  • the enhanced physical layer includes a spread spectrum/de-spreading, modulation/demodulation function; and includes Multiple Input Multiple Output (MIMO) and/or Orthogonal Frequency-Division Multiple (OFDM) )Features.
  • MIMO Multiple Input Multiple Output
  • OFDM Orthogonal Frequency-Division Multiple
  • the user plane protocol stack of the present invention adopts the AM mode for lossless migration by: in the NCLP layer of the UE and the IAGW user plane protocol stack, buffering the NCLP data packet to be sent to the peer end, and setting the NCLP sequence number, which will carry the The NCLP packet of the sequence number is forwarded to the peer through the ERS. After receiving the acknowledgment packet sent by the peer, the local end deletes the NCLP packet corresponding to the confirmed sequence number buffered by the local end.
  • the PDCP In the prior art user plane protocol stack, the PDCP is in the ERS user plane protocol stack, and the underlying transmission can ensure the arrival of the PDCP packets in sequence, so the PDCP usually transmits the PDCP non-header protocol data unit (PDCP-No-Header PDU) and The PDCP Data Protocol Data Unit (PDCP Data PDU) transmits the PDCP Sequence Number Protocol Data Unit (PDCP SeqNum PDU) to synchronize the sequence number only when the out-of-synchronization or RLC restarts.
  • the present invention places the NCLP protocol layer (completes the function equivalent to the original PDCP protocol layer) in the IAGW.
  • the NCLP protocol layer needs to maintain the serial number to ensure that the NCLP data packets are not lost during migration.
  • the NCLP protocol layer always sends NCLP SeqNum PDUs (like PDCP SeqNum as defined in the 3GPP TS 25.323 specification)
  • the PDU that is, the AMLP data packet of the AM mode always carries the sequence number, so that the NCLP protocol layer can know the untransmitted NCLP PDU.
  • the NCLP protocol layer in the UE and IAGW user plane protocol stack may request to transmit the NCLP packet corresponding to the unacknowledged sequence number (SN).
  • SN unacknowledged sequence number
  • sending an acknowledgment packet it may be sent by separate signaling, or it may be a piggyback acknowledgment, that is, the acknowledgment packet is transmitted together with the reverse data.
  • the following line (the IAGW sends a packet to the UE) is used as an example to describe the transmission process of the NCLP packet.
  • the downlink NCLP packet sets the sequence number to the NCLP packet according to the receiving order of the IAGW, and the NCLP protocol layer can also segment the large packet received by the upper layer, so that the packet transmitted to the GTP-U protocol layer does not exceed the maximum of the GTP-U.
  • Packet length (3GPP TS 23.060 requires GTP-U to have a packet length of no more than 1500 bytes for IP and no more than 1502 bytes for PPP).
  • the NCLP protocol layer buffers the downlink data packet, and copies one copy to the transport layer.
  • the GTP-U protocol layer can be sent without using a serial number (of course, it can also be sent by using a serial number, but without a sequence. Number can save link bandwidth).
  • the order in which the NCLP data packets arrive at the ERS through the IP network may be different from the transmission order of the IAGW.
  • the ERS performs RLC, segmentation, and the like according to the order of reception, and transmits to the UE.
  • the peer RLC of the UE after the protocol layer receives the retransmission and other RLC, layer operation, when the RLC, the protocol layer receives all the segments of the NCLP packet, combines and delivers to the upper layer NCLP protocol layer, at this time,
  • the incoming NCLP PDU is not necessarily the smallest serial number of PDUs to be received.
  • the ERS determines that the NCLP packet has been sent, it does not send an acknowledgment message (such as RLC, -AM-DATA-Conf) to the IAGW because the ERS does not know which NCLP packet was sent successfully.
  • an acknowledgment message such as RLC, -AM-DATA-Conf
  • the IAGW After receiving the data packet by the UE's NCLP protocol layer, it is acknowledged and transmitted to the peer NCLP protocol layer of the IAGW through the ERS.
  • the IAGW transmitting the NCLP data packet to the UE, if the enhanced radio link control protocol layer in the ERS user plane protocol stack finds that the data packet is not successfully forwarded, the IAGW is notified to resend the NCLP layer in the user plane protocol stack. Cached unacknowledged packets.
  • the UE After the UE correctly receives the NCLP data packet, it can send the acknowledgement packet to the peer end separately. Or send it to the peer through other packet piggybacks sent to the peer.
  • the NCLP protocol layer of the IAGW deletes the confirmed cached packets.
  • the principle of uplink data transmission is relatively simple.
  • the bottom layer of the transmission between the UE and the ERS can guarantee the transmission sequence of the data packet.
  • the NCLP layer of the UE sends a data packet to its RLC, layer, and is segmented, transmitted, and retransmitted by the RLC layer.
  • Management such as RLC, layer operation, if the RLC, the layer finds that there is a packet that has not been successfully transmitted, then the inter-layer primitive signaling indicates that the NCLP layer in the UE retransmits the data packet, and does not have to retransmit all the unacknowledged packets. Packet.
  • the uplink data packet sent by the NCLP layer in the UE user plane protocol stack to the IAGW must always carry the NCLP sequence number. Other operations are similar and will not be repeated.
  • the IAGW or the UE After the UE is migrated, the IAGW or the UE directly sends the unacknowledged NCLP packet buffered in the NCLP layer to the new ERS, and performs data forwarding through the migrated new ERS. If the received data packet is received again, the data packet is discarded, and the acknowledgment data packet is sent again to the opposite end; if the NCLP packet that has not been received before is received, the acknowledgment data packet is received and sent to the opposite end. . To enhance flow control, a sliding window can be used to control the number of NCLP packets sent.
  • the RLC is used in the AM mode, and the retransmission is performed to ensure the high efficiency of the RLC and layer retransmission because the RLC is in the ERS close to the UE. If other modes are used to ensure "confirm" transmission, although the NCLP layer is guaranteed to retransmit, the retransmission delay is too large because the IAGW is far away from the air interface.
  • NCLP-No-Header PDU For uncompressed data, carry the NCLP No-Header Protocol Data Unit (NCLP-No-Header PDU); for compressed data, carry the NCLP Data Protocol Data Unit (NCLP Data PDU).
  • NCLP-No-Header PDU and the NCLP Data PDU are the same.
  • GTP-U processing data packets of GTP-U whose user data is out of order such as IP/PPP.
  • the user data of GTP-U is X.25 and other guaranteed order data, for TM/UM mode
  • GTP -U layer needs to use the transmission method with serial number format, as in the 3GPP TS29.060 specification Defined GTP-U with serial number format.
  • the transfer order can be guaranteed by using the above method provided by the present invention for the AM mode.
  • the MAC, layer, RLC, and layer may have retransmission capabilities.
  • the NCLP layer In order to achieve the simplification of the lossless migration and migration process, the NCLP layer also needs to have retransmission function.
  • MAC, layer and RLC layers can be merged, such as canceling RLC, layer, MAC, layer function enhancement, and completing segmentation.
  • HARQ Hybrid-Automatic Repeat reQuest, hybrid automatic retransmission request
  • retransmission is reflected in HARQ.
  • the user plane protocol stack maintaineds the NCLP sequence number at the NCLP protocol layer of the IAGW, performs header compression, and transmits the header compressed data packet to the Iu interface, thereby improving transmission efficiency;
  • the method can realize seamless and non-destructive migration in the migration, without the serial number transfer and data transfer by the ERS, and it is not necessary to use the interface between the ERS, which greatly saves the cost.
  • the NCLP data packet is buffered in the IAGW, the IAGW understands the data transmission and reception.
  • the ERS does not need to use the data traffic report. Under the multi-rate, the IAGW can charge in real time, which solves the problem of multi-rate charging in the prior art. .
  • the user plane protocol stack of the present invention can also easily support MAC, layer and RLC, layer merging.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Cette pile de protocoles utilisateur comprend des piles de protocoles utilisateur IAGW ERS et UE. La pile de protocole IAGW comporte une couche pour un nouveau protocole de convergence à couche (NCLP), une couche GTP-U, une couche UDP/IP, une couche L2 et une couche L1. La pile de protocoles ERS comprend une couche GTP-U, une couche UDP/IP, une couche L2 et une couche L1, la couche améliorée du protocole de commande de liaison radio, la couche améliorée MAC et la couche améliorée physique. La pile de protocoles utilisateur UE comprend une couche NCLP, une couche améliorée de protocole de contrôle de liaison radio, la couche MAC améliorée et la couche physique améliorée. Le procédé de transfert sans perte permet le maintien du nombre de séquences NCLP dans IAGW et la compression de l'en-tête. Les données sont transmises moyennant l'interface Iu' après compression de l'en-tête, avec pour effet l'amélioration de l'efficacité de transmission. Les nombres de séquences sont déterminés en alternance avec des communications homologues entre la couche UE et la couche NCLP de IAGW, d'où un transfert sans perte et en continu.
PCT/CN2006/002045 2005-08-26 2006-08-14 Pile de protocoles utilisateur et procede de transfert sans perte WO2007022694A1 (fr)

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CN117834755A (zh) * 2024-03-04 2024-04-05 中国人民解放军国防科技大学 面向芯粒互连接口的协议层与适配器层间接口电路及芯片
CN117834755B (zh) * 2024-03-04 2024-05-10 中国人民解放军国防科技大学 面向芯粒互连接口的协议层与适配器层间接口电路及芯片

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