WO2007051379A1 - Méthode de transfert de service dans un système de communication cellulaire sans fil - Google Patents

Méthode de transfert de service dans un système de communication cellulaire sans fil Download PDF

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Publication number
WO2007051379A1
WO2007051379A1 PCT/CN2006/001401 CN2006001401W WO2007051379A1 WO 2007051379 A1 WO2007051379 A1 WO 2007051379A1 CN 2006001401 W CN2006001401 W CN 2006001401W WO 2007051379 A1 WO2007051379 A1 WO 2007051379A1
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WO
WIPO (PCT)
Prior art keywords
data tunnel
tunnel function
terminal
function body
service
Prior art date
Application number
PCT/CN2006/001401
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English (en)
Chinese (zh)
Inventor
Yujie Zhang
Original Assignee
Zte Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zte Corporation filed Critical Zte Corporation
Publication of WO2007051379A1 publication Critical patent/WO2007051379A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off

Definitions

  • the present invention relates to a handover method in a wireless cellular communication system, and more particularly to a method for protecting data integrity during handover in a non-real time service. Background technique
  • the main measurement parameters are data integrity, delay, and jitter.
  • the impact of switching on these parameters should be minimized. More precisely, the data integrity during the handover process is guaranteed. That is, the packet loss rate, retransmission, and out-of-order should not be increased due to handover. Data tunnel setup delays and jitter should be kept to a minimum.
  • MS mobile station
  • 802.16e the MS (mobile station) assisted handover mechanism proposed in 802.16e is an air mechanism for ensuring data integrity.
  • a data integrity solution for HO is proposed to ensure data integrity during the handover process.
  • the ARQ (automatic repeat request) mechanism and the SN (sequence number) feedback mechanism are implemented in the non-master data tunneling functional entity, thereby making the state of the ARQ and It is extremely difficult and cumbersome for the SN to transmit status information to be shared among multiple non-master data tunneling functional entities.
  • the invention provides a service switching party for guaranteeing data integrity in a wireless cellular communication system
  • the method includes a master data tunnel function, a service data tunnel function, a target data tunnel function, and a plurality of terminals, and the method includes the following steps:
  • the main control data tunnel function body After determining the handover after receiving the handover request initiated by the terminal, the main control data tunnel function body has determined whether to start the ARQ mechanism or the serial number feedback mechanism according to different services, and cache the MAC SDU data packet;
  • the MAC data SDU data packet is sent to the terminal through the service data tunnel function body currently communicating with the terminal;
  • the terminal When switching access, the terminal sends feedback information to the main control data tunnel function body through the target data tunnel function body according to the received MAC SDU data packet;
  • the master data tunnel function body sends or retransmits the MAC SDU data packet to the terminal in the manner of forwarding the target data tunnel function according to the feedback information, and the handover is completed.
  • a significant advantage of the present invention is that the processing logic for the ARQ mechanism and the SN feedback mechanism is simple and natural, avoiding a large amount of message interaction between the service data tunnel function and the target data tunnel function for maintaining data synchronization, including ARQ.
  • the state and the SN send status information interaction.
  • the implementation data is only cached in the main control data tunnel function body, which avoids the second level cache on the service data tunnel function body and the target data tunnel function body, reduces the complexity of the system data cache processing, and saves the cache. space. BRIEF abstract
  • FIG. 1 is a distribution diagram of each data tunnel function body according to the method of the present invention
  • FIG. 2 is a detailed structural diagram of a data tunnel involved in the method according to the present invention
  • FIG. 3 is a flow chart of implementing an ARQ mechanism in the method according to the present invention.
  • FIG. 1 shows the distribution of the various data tunneling functionalities in the access service network system.
  • Master The data tunnel function (Anchor Data Path Function) is the same as the non-master data tunnel function body (that is, the next level function of the master data tunnel function body, which is called the service data tunnel function body or the target data tunnel function body in the present invention.
  • the non-master data tunnel function body that is, the next level function of the master data tunnel function body, which is called the service data tunnel function body or the target data tunnel function body in the present invention.
  • L2 layer 2
  • the relevant handover control message transmitted by the data tunnel is finally sent to the main control data tunnel function body, and the main control data tunnel function body ensures the continuous retransmission of the data after the handover.
  • the non-master data tunneling function should parse the control information of the master data tunnel function body to assist in the protection of data integrity during the handover process.
  • the layer 2 session and layer 2 data processing are transmitted between the master data tunnel function and the core network, and the layer 2 packet buffer is implemented.
  • a layer 2 data packet can be generated and compressed into a tunnel packet to be transmitted to the service data tunnel function body or the target data tunnel function body.
  • a tunnel packet is a packet encapsulated by a layer 2 packet using a certain protocol, such as CUDP (compress User Datagram Protocol) or UDP (User Datagram Protocol) protocol.
  • CUDP compress User Datagram Protocol
  • UDP User Datagram Protocol
  • the Serving Data Path Function in Figure 1 is associated with the physical layer of the MS with the 802.16 standard, maintains the air interface with the MS, and is responsible for transmitting all MAC layer messages to the MS.
  • the MS moves to another cell and satisfies the target under the handover condition.
  • the target data tunnel function becomes the MS new service data tunnel function.
  • the master does not actually communicate with the MS, but indirectly controls the communication through the service data tunnel function or the target data tunnel function, so it is indicated by a dotted line.
  • FIG. 2 shows a detailed structure of the data tunnel.
  • the master data tunnel function body 201 is implemented in the base station control system BSC, and the non-master data tunnel function body 202 is placed in the base station transceiver system BTS.
  • the implementation may be a service data tunnel function or a target data tunnel function.
  • the IP layer data packet is directly sent by the data tunnel to the service data tunnel function body or the target data tunnel function body, the service data tunnel function body and the target data tunnel.
  • the functional entities are each implemented in a complete base station system BS.
  • the master data tunnel function classifies the application layer IP packet (L3 data packet) into each service stream.
  • a MAC SDU service data unit
  • additional control information such as SDU SN
  • SDU SN additional control information
  • the main control data tunnel function body is decompressed by the non-master tunnel function body, and the control information is removed, and then a MAC PDU (protocol data unit) is formed and transmitted.
  • the upper layer IP packet accessed by the master data tunnel function can be transmitted from the AGW (access gateway).
  • the service data tunnel function For uplink packets, the service data tunnel function first receives the MAC PDU and removes additional information such as MAC header, CRC (cyclic redundancy check). It is then compressed into a tunnel packet using cUDP or UDP protocol and transmitted to the master data tunnel function. After the main control data tunnel function is decompressed into a MAC SDU, it is restored to an IP data packet by header compression processing, and finally sent to the core network.
  • CRC cyclic redundancy check
  • the ARQ mechanism and the SN feedback mechanism can operate independently.
  • the ARQ mechanism is used to ensure that the ARQ mechanism is enabled and the SN feedback mechanism is enabled.
  • retransmission mechanisms cannot be used because the most important real-time requirements cannot be guaranteed, so data integrity is difficult to guarantee.
  • FIG. 3 shows a flow chart of the ARQ mechanism in the method of the present invention.
  • 301 is a service system
  • 302 is a target system
  • 303 is a master control system.
  • Each system includes a physical/MAC function body, a data tunnel function body, and a switching function body, wherein the data tunnel function bodies in 301, 302, and 303 are a service data tunnel function body, a target data tunnel function body, and a master data tunnel, respectively.
  • Functional body The MAC SDU is generated by the master data tunnel function and transmitted to the service data tunnel function by the data tunnel.
  • the service data tunnel function reassembles the MAC SDU composed of the ARQ block into a MAC PDU and sends it to the MS. After the MS receives the ARQ Block, is it sent?
  • the function receives the feedback information of an ARQ block to the service data tunnel function body, and the service data tunnel function forwards the information to the master data tunnel function body, and the master data tunnel function body determines whether the ARQ block needs to be retransmitted. Send the next new ARQ Block.
  • Such an ARQ Block transmission process regardless of whether or not a handover occurs, is performed in accordance with such a transmission principle.
  • the effect of the handover on the switch is that the ARQ feedback message sent by the MS is sent to the service data tunnel function body, and is forwarded by the service data tunnel function body to the master data tunnel function body; after switching the access target, the MS The sent ARQ feedback message is sent to the target data tunnel function body, and is forwarded by the target data tunnel function body to the master data tunnel function body.
  • whether or not the handover occurs does not affect its ARQ mechanism, thereby completing the handover of the service system to the target system and ensuring data integrity.
  • the method includes the following steps:
  • Step a The terminal initiates a handover request, and when the system decides to enter the handover, the main control data tunnel function has started the ARQ feedback mechanism according to the service type, and caches the MAC SDU data packet in the main control data tunnel function body;
  • Step b The master data tunnel function body sends a .MAC SDU data packet composed of an ARQ Block to the service data tunnel function currently communicating with the terminal;
  • Step c The service data tunnel function sends the received ARQ Block to the terminal through the air interface
  • Step d The terminal sends a receiving confirmation message to the service data tunnel function body for each received ARQ block, and the service data tunnel function body is further forwarded to the main control data tunnel function body. If the receiving confirmation message is that the terminal does not receive the ARQ, Block, the master data tunnel function weight transfer;
  • Step e When the access is switched, the terminal sends the acknowledgement information of the ARQ block received from the service data tunnel function to the target data tunnel function, and the target data tunnel function body forwards the function to the master data tunnel function body;
  • Step f The main control data tunnel function body determines whether to retransmit the feedback signal according to the receiving confirmation information.
  • ARQ Block indicated by the information If the feedback information is that the terminal does not receive the ARQ Block, the master data tunnel function body transmits the weight to the target data tunnel function.
  • FIG. 4 shows the flow of the SN feedback mechanism in the method of the present invention. 401 is the same as the service system in FIG. 3, 302 is the target system in FIG. 3, and 303 is the main control system in FIG.
  • the MAC SDU is generated by the main control data tunnel function and transmitted to the service data tunnel function body through the data tunnel.
  • the service data tunnel function group packet is formed into a MAC PDU and then transmitted to the MS.
  • the MS can have acknowledgement feedback for each MAC SDU, or no.
  • the MS feeds back the SN sequence number of the last MAC SDU received by the original service data tunnel function to the target data tunnel function, and the target data tunnel function forwards it to the master data tunnel.
  • the function body, the master data tunnel function determines the first MAC SDU to be transmitted after the handover.
  • the method includes the following steps:
  • Step a When the terminal initiates the handover request, the system determines to switch, and the main control data tunnel function body starts the SN feedback mechanism according to the service type, and caches the MAC SDU data packet in the main control data tunnel function body;
  • Step b The master data tunnel function body sends a MAC SDU data packet to the service data tunnel function currently communicating with the terminal;
  • Step c The service data tunnel function sends the received MAC SDU data packet to the terminal through the air interface, and sends the MAC SDU data packet carrying the SN sequence number to the terminal according to the period negotiated by the terminal and the master data tunnel function body;
  • Step d After receiving the MAC SDU packet carrying the SN sequence number, the terminal automatically updates its saved SN sequence number. When receiving the MAC SDU packet that does not carry the SN sequence number, the terminal automatically adds one of the SN sequence numbers saved by itself. ;
  • Step e The terminal feeds back the SN sequence number of the last MAC SDU packet received by the service data tunnel function from the target data tunnel function body, and then the target data tunnel function The body forwards the received SN sequence number to the master data tunnel function body;
  • Step f The master data tunnel function body confirms that the terminal has successfully received the last MAC SDU sent by the service data tunnel function body according to the received SN sequence number, and the master data tunnel function body is next to the SN sequence number.
  • the MAC SDU data packet corresponding to the sequence number starts to send the subsequent MAC SDU data packet to the target data tunnel function body;
  • Step g The target data tunnel function sends the received MAC SDU data packet to the terminal.
  • the present invention aims to propose a reasonable broadband wireless access network handover method, so that the service data can still ensure sufficient integrity during the handover process.
  • the present invention proposes a service switching method in a wireless cellular communication system that enables service data to maintain sufficiently good integrity during handover.
  • the processing logic of the ARQ mechanism and the SN feedback mechanism is simple and natural, and avoids a large number of message interactions between the service data tunnel function body and the target data tunnel function body for maintaining data synchronization, including ARQ status and SN transmission.
  • the interaction of status information is only cached in the main control data tunnel function, which avoids the second level cache on the service data tunnel function and the target data tunnel function, which reduces the complexity of the system data cache processing and saves the cache space.

Abstract

Méthode de transfert de service dans un système de communication cellulaire sans fil. Lorsqu'un dispositif terminal de communication sans fil décide de réaliser un transfert après avoir initié une requête de transfert, une fonction de chemin de données d’ancrage décide de démarrer un mécanisme ARQ ou un mécanisme de rétroaction de numéro de séquence en fonction de différents services et met en tampon un paquet de données MAC SDU, et envoie le paquet de données MAC SDU au terminal par la fonction de chemin de données actuellement en service, avant le transfert. Le terminal envoie des informations de rétroaction à la fonction de chemin de données d’ancrage par la fonction de chemin de données cible lors de l’accès de transfert, la fonction de chemin de données d’ancrage envoie le paquet de données MAC SDU au terminal par la fonction de chemin de données cible selon les informations de rétroaction, et le transfert est alors effectué. La présente invention permet aux données de service de conserver une intégrité suffisante pendant le processus de transfert, la logique de traitement du mécanisme ARQ ou du mécanisme de rétroaction de numéro de séquence est simple, elle diminue la complexité des données système de traitement de tampon, et économise l’espace tampon parce qu’elle ne réalise une mise en tampon que dans la fonction de chemin de données d’ancrage.
PCT/CN2006/001401 2005-11-05 2006-06-20 Méthode de transfert de service dans un système de communication cellulaire sans fil WO2007051379A1 (fr)

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CN200510101172.9 2005-11-05
CNB2005101011729A CN100502587C (zh) 2005-11-05 2005-11-05 一种无线蜂窝通信系统中的业务切换方法

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PL2183870T3 (pl) 2007-08-13 2016-04-29 Qualcomm Inc Optymalizacja dostawy pakietów danych w kolejności podczas przekierowania komunikacji bezprzewodowej
CN101207848B (zh) * 2007-12-13 2011-07-06 上海华为技术有限公司 数据业务切换的方法及系统、基站
KR20100027935A (ko) 2008-09-03 2010-03-11 삼성전자주식회사 무선통신시스템에서 에러제어를 위한 데이터 생성 장치 및 방법
JP2017508408A (ja) * 2014-03-19 2017-03-23 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． データ送信及びフィードバック処理方法並びに装置

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CN1533056A (zh) * 2003-03-19 2004-09-29 �ձ�������ʽ���� 移动通信系统、无线电网络控制器及其数据传输方法
WO2005055636A1 (fr) * 2003-12-05 2005-06-16 Nokia Corporation Procede, systeme et entite de protocole du cote emission permettant d'envoyer des unites de donnees par paquets pour des services a mode sans accuse de reception

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040088641A1 (en) * 2000-12-09 2004-05-06 Johan Torsner Transmission control method in a radio access network implementing an automatic repetition request (aqr) protocol at the base station (aqr)
CN1533056A (zh) * 2003-03-19 2004-09-29 �ձ�������ʽ���� 移动通信系统、无线电网络控制器及其数据传输方法
WO2005055636A1 (fr) * 2003-12-05 2005-06-16 Nokia Corporation Procede, systeme et entite de protocole du cote emission permettant d'envoyer des unites de donnees par paquets pour des services a mode sans accuse de reception

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CN1960561A (zh) 2007-05-09

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