WO2003026326A1 - Procede d'augmentation de la rapidite de la selection de cellules lors de la procedure d'acces pour des paquets telecharges a haute vitesse - Google Patents

Procede d'augmentation de la rapidite de la selection de cellules lors de la procedure d'acces pour des paquets telecharges a haute vitesse Download PDF

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Publication number
WO2003026326A1
WO2003026326A1 PCT/CN2002/000154 CN0200154W WO03026326A1 WO 2003026326 A1 WO2003026326 A1 WO 2003026326A1 CN 0200154 W CN0200154 W CN 0200154W WO 03026326 A1 WO03026326 A1 WO 03026326A1
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WIPO (PCT)
Prior art keywords
cell
base station
pdu
new
link
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PCT/CN2002/000154
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English (en)
Chinese (zh)
Inventor
Ping Zhang
Honghua Yan
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Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2003026326A1 publication Critical patent/WO2003026326A1/fr

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0061Transmission or use of information for re-establishing the radio link of neighbour cell information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0069Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/16Performing reselection for specific purposes
    • H04W36/18Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements

Definitions

  • the invention relates to a fast cell selection method in high-speed downlink packet access of a wireless communication system.
  • the FCS Flust Cell Selection
  • HSDPA High Speed Downlink Packet Access
  • RC radio network controller
  • PDU Protocol Data Unit
  • the RNC sends PDU data to all cells in the active set at the same time, and then the UE (user equipment) chooses to receive data from a cell with the best performance, while other cells' downlink transmission to the UE remains at Suspended state.
  • the primary cell changes, that is, when the UE selects another cell to receive data, the current primary cell hangs up, and the selected new cell starts to transmit data.
  • the UE After receiving the data sent by the primary cell, the UE feeds back an ACK (acknowledgement) information for each TTI (transmission time interval) carrying the data.
  • the primary cell converts the acknowledgment information of these TTIs into the acknowledgment information of the PDUs carried by the corresponding TTI.
  • all the cells in the activation set can listen to the ACK signaling sent by the UE through the uplink channel, since the secondary cells do not know which PDUs are encapsulated in the TT corresponding to the ACK, they cannot interpret this signaling, and can only Use the primary cell to know which PDUs have been acknowledged.
  • all cells in the active set need to maintain the synchronization of the PDU transmission status, that is, although only the primary cell sends data to the UE at any time and interprets the returned ACK information.
  • activation focus The other slave cells also need to keep track of the PDU reception status, including acknowledged, retransmitted, and other related transmission parameters.
  • the above synchronization process can usually be controlled by the RNC through the network, and it periodically issues PDU reception confirmation information to each slave cell according to the information reported by the UE or the primary cell. Each slave cell adjusts its own PDU queue according to this information to keep it consistent with the status of the PDU queue of the master cell.
  • a better method for the RNC to obtain the reception status of the PDU by the UE is a NodeB ( radio base station of a broadband code division multiple access system) assisted mapping method (NodeB assisted PDU bitmap).
  • NodeB assisted PDU bitmap the primary cell generates a mapping based on the acknowledged status of each PDU in the PDU queue, that is, a bitmap with the length of the PDU queue, each bit in turn represents the acknowledgement status of a PDU in the PDU queue, and then reports it from the NodeB as a message.
  • the RNC then forwards this mapping message to each non-primary cell. Because the mapping message needs to be forwarded by the RNC, the signaling delay that passes through the lub / Iur (interface between the RNC and the base station / interface between the RNC) multiple times will cause a delay in cell synchronization.
  • the new cell For an active set, if a new cell is added, the new cell must first obtain the same PDU queue as the primary cell, and then can perform the PDU synchronization operation like other cells. Since the PDU data required by the new NodeB is delivered from the RNC, and since the RNC cannot determine the status of the PDU queue in the current primary cell, it must first request the primary cell for information on "unconfirmed PDUs". The RNC then forwards these PDUs through the new cell.
  • An object of the present invention is to provide a method capable of improving fast cell selection performance in a high-speed downlink packet access process.
  • a method for improving fast cell selection performance in a high-speed downlink packet access process includes:
  • the PDU (Protocol Data Unit) confirmation status is transmitted to the secondary cell through a transmission link between the base station to which the primary cell belongs and the base station to which the secondary cell belongs.
  • the cell adjusts the PDU queue of the cell according to the PDU confirmation status, and then completes the PDU status synchronization control between cells;
  • IP Internet Protocol
  • the process of transmitting the PDU acknowledgment status to the slave cell is completed through a PDU queue status synchronization message between the base stations.
  • the method further includes:
  • the owning cell is a secondary cell, receive a "PDU confirmation status” message from the primary cell, and adjust the PDU queue of the local cell according to the message, or receive two PDUs from the primary cell and the radio network controller, and Organize them into the PDU queue of this cell.
  • the user equipment When the primary cell is replaced, the user equipment sends the identification of the new primary cell to all cells in the active set.
  • the new primary cell starts the suspended downlink after receiving the identification, and the original primary cell suspends the downlink after receiving the identification. .
  • the links between the base stations to which all secondary cells belong and the base stations to which the new primary cell belongs are re-established according to the following method: (11)
  • the base station to which the original primary cell belongs stops sending PDU confirmation status messages to the base station to which the original secondary cell belongs and the base station to which the new primary cell belongs;
  • the base station to which the original primary cell belongs assigns a new link identifier for receiving data transmitted by the new primary cell, and passes through it to the base station to which the new primary cell belongs together with the link identifiers between it and other base stations to which the secondary cell belongs
  • the existing transmission link is transmitted to the new primary cell, and the new primary cell directly sends new synchronization information to these cells according to these identifiers;
  • the base station to which the new primary cell belongs releases the link identifier of the link between the original and the original primary cell.
  • the present invention is different from the existing fast cell selection mechanism in that: 1) a direct IP is established between the base station to which the primary cell belongs and the base stations to which other cells in the active set belong Transmission link; when a cell enters the active set, an IP link with the main cell is established; when the primary cell is replaced or the cell exits the active set, the link is removed. 2) A synchronization control module is added in each cell.
  • this module When the cell is the master cell, this module has the functions of "publishing PDU status synchronization information" and “forwarding unconfirmed PDUs", and when the cell is the slave cell, it has the function of receiving "PDU status synchronization information” and "Receive new cell fill data from the primary cell and RNC dual” functions. 3) Remove the signaling on the Iub interface that the R C requests the "PDU transmission status” from the primary cell and the synchronization signaling that the RNC sends the "PDU transmission status” to the secondary cell. 4) Change the signaling flow of the FCS process.
  • the present invention accelerates the process of synchronizing the PDU queues between cells in the active set, and accelerates the data filling process of cells newly entering the active set; it can synchronize HARQ and AMC among cells, etc. Low-level transmission parameters; It is possible to make HARQ continuous during the replacement of the primary cell.
  • the present invention can improve the continuity of PDU transmission in the fast cell selection process, reduce the delay of transmission time, reduce the signaling between the radio network controller and the base station, and simplify the entire fast cell selection process.
  • FIG. 1 is a schematic flowchart of a method of the present invention
  • FIG. 2 is a communication path diagram between entities when inter-cell PDU states are synchronized in the FCS process
  • Fig. 3 is a communication path diagram of entities when new cell data is filled in the FCS process;
  • Fig. 4 is a reception process diagram of a dual PDU of a PDU status synchronization control module;
  • Fig. 5 is a first state diagram of a specific FCS implementation process ;
  • FIG. 6 is a second state diagram of the FCS implementation process described in FIG. 5;
  • FIG. 7 is a third state diagram of the FCS implementation process described in FIG. 5;
  • FIG. 8 is a first state diagram of the FCS implementation process described in FIG. 5.
  • IP transmission is introduced in UTRAN (UTMS Terrestrial Radio Access Network, UTMS: Universal Mobile Communication System), and the data stream on the Iub interface is identified by "UDP (User Datagram Protocol) port number + IP address” That is, the data flow on the interface is identified by the "destination IP address” and "destination UDP port number”.
  • UDP User Datagram Protocol
  • the RAN radio access network
  • each network element is directly connected to the edge router of the IP network.
  • HSDPA High-Speed Downlink Packet Access Frame Protocol
  • the "destination UDP port number + destination IP address" of the data stream is allocated by the new NodeB, and the original NodeB is notified by the RC through NBAP (wideband code division multiple access system base station application part) signaling.
  • NBAP wideband code division multiple access system base station application part
  • the first step is to establish a transmission link between the radio network controller and the base stations to which all cells in the active set belong, and the base station to which the master cell belongs and the base stations to which all slave cells belong. Between transmission links.
  • a second step after the primary cell performs data transmission with the user equipment and receives confirmation feedback, the PDU (Protocol Data Unit) confirmation status is transmitted to the secondary cell through a transmission link between the base station to which the primary cell belongs and the base station to which the secondary cell belongs, The slave cell adjusts the PDU queue of the own cell according to the PDU confirmation status, thereby completing the PDU status synchronization control between cells.
  • the above-mentioned transmission of the PDU confirmation status to the secondary cell can be completed by using a PDU queue status synchronization message between the base stations.
  • This step refers to FIG. 2.
  • the RNC's PDU delivery to NodeB is synchronized, and the received PDU queues in each cell are the same.
  • the primary cell After the primary cell has transmitted data with the UE and received ACK feedback, it marks the PDUs that have been confirmed in its PDU queue, and transmits the PDU confirmation status to other cells through the direct transmission path between NodeBs.
  • the radio network controller uses the transmission link between the radio network controller and the base stations to which all the cells in the active set belong. All cells in the activation set issue new PDUs.
  • the new cell organizes the two received PDUs from the primary cell and the radio network controller into the PDU queues of the cell, and then completes the PDU queues of the new cell and those of other cells. Synchronization process. This step refers to FIG. 3. As shown in FIG. 3, during the data filling process of the new cell, it is assumed that cell 5 is a newly entered active set cell. In order to obtain the same PDU queue and status as the primary cell, the primary cell still has not been confirmed through the path between NodeB PDU is transmitted to the new cell. The new cell PDU queue composed of PDU data directly transmitted from the primary cell naturally maintains the synchronization status of the PDU queue of the primary cell, and thus does not require additional synchronization information.
  • the RNC can still send new PDUs to all cells in the active set at the same time.
  • the PDUs in it are actually transmitted by two independent paths: 1) the main cell, along the new transmission path between NodeBs; 2) RNC, along the RC to NodeB Traditional transmission path.
  • the transmission link described in the second and third steps is an IP (Internet Protocol) link.
  • IP Internet Protocol
  • the RNC sends a "link establishment request" signaling to NodeB-new.
  • NodeB-new assigns an identifier to the link between RNC and it.
  • NodeB-new also assigns a link between it and NodeB-old ( NodeB-old-> NodeB-new) assign an identity.
  • NodeB-new returns these two identities to the RNC through signaling of "link establishment response". So far, the RNC downlink to NodeB-new has been established.
  • the RC After receiving the "link establishment response" signaling returned by NodeB-new, the RC sends the link identifier allocated by the new NodeB among them to establish a link between the old and new NodeBs through the "link establishment request" signaling. NodeB-old and NodeB-old then assign an identifier to the link between it and NodeB-new to establish a direct transmission link between the two NodeBs.
  • the present invention also adds a module with a "PDU status synchronization control function" to the MAC-hs of the cell.
  • the functions of this module in the main cell are:
  • the two PDUs from the primary cell and from the RNC may arrive alternately.
  • the default receiving function of the PDU synchronization control module sorts them and sends them to the MAC-hs PDU buffer queue.
  • the method of inserting two PDUs into different positions of the PDU queue can be used to quickly achieve the ordering between them, that is, a new cell PDU queue is set up with two The position demarcation flags of the PDUs are inserted into the PDU queue end and the position demarcation flags after the PDUs are received one by one by the 3 ⁇ 4U ⁇ receiving function. In this way, when the PDU reception is completed, the MAC-hs PDU buffer queue is in order. It is exactly the same as the PDU queue of the primary cell.
  • the transmission link with the base station to which the cell belongs and the transmission link between the base station to which the primary cell belongs and the base station to which the cell belongs are removed. It is assumed that the NodeB to which the primary cell belongs is NodeB-primary, and the NodeB to which the secondary cell belongs is NodeB-secondary, and they all belong to the same RNC. When the secondary cell exits from the active set, the RNC will remove two links: A link between the NodeB-primary and the RC; 2) a link between the NodeB-secondary and the RC.
  • the dismantling process is as follows: The RNC sends a "link release request" signaling to the NodeB-secondary, the NodeB-secondary releases the link between it and the RNC, and at the same time the link between the NodeB-secondary and NodeB-primary allocated by it The path identifier is returned to the RNC through signaling, and the RNC then notifies the NodeB-primary to stop it from sending a synchronized "PDU acknowledgement status" message to the NodeB-secondary.
  • the UE when a primary cell replacement is required, the UE sends an identifier of the selected new primary cell to all cells in the active set, and each cell listens to the identifier. If it is found that the selected cell is itself, then Start the suspended downlink and start as The primary cell transmits PDU data.
  • the downlink of the original primary cell is changed to the suspended state. Since the PDU queues in each cell are kept in a synchronized state, the replacement of the primary cell has no effect on the content of the transmitted PDUs, and the UE receives a continuous PDU data stream.
  • the method for improving HSDPA FCS performance based on the NodeB direct communication and dual-channel PDU described in the present invention is applicable to both the cell activation set in the same RNC and the cell activation set covering different R Cs.
  • the direct communication between NodeBs brings greater gains in transmission efficiency.
  • the dual-channel PDU filling function can make unconfirmed PDUs in the primary cell directly reach the new cell without going through such a long path as "NodeB ⁇ RNC ⁇ RNC ⁇ NodeB".
  • the synchronization of the transmission parameters of the inter-cell HARQ and AMC is not affected by the internal or inter- RNC, which makes the universality of the present invention more obvious.
  • the RLC PDU queue state of the RNC at this time is the state shown in FIG. 6, where PDUs with a sequence number of 0 to 999 have been delivered to NodeB-1.
  • the PDU queue status in the MAC-hs cache of the primary cell at this time is shown in FIG. 7, where the first 600 PDUs have been sent to the UE and the UE has received a flag of a successful ACK message. The next 400 PDUs have not been confirmed.
  • the RNC After the new cell B enters the active set, the RNC immediately establishes a new link with NodeB-2: PATH-1.
  • the identifier of its transmission bearer is: destination UDP port number (UDP port number 2), and destination IP address (NodeB- 2 IP address).
  • NodeB-1 and NodeB-2 also establish a direct transmission link between them: PATH-2, the identification of its transmission bearer is: destination UDP port number (UDP port number 3), destination IP address (NodeB-2 IP address).
  • the primary cell A and the RNC simultaneously fill the buffer of the new cell B with the PDU data.
  • the primary cell A uses its "Transmit Unconfirmed PDU” function of the "PDU Synchronization Control Function” to encapsulate the PDU Nos. 600 to 999 in the queue in an HSDPA FP frame and transmit it to Cell B; in this process, the RNC may also send Cell A and cell B deliver new PDUs in the window synchronously, that is, PDUs with sequence numbers of 1000 to 1499.
  • Cell B receives the PDU data carried by HSDPA-FP through two paths, PATH-1 and PATH-2, through its "dual reception function" of "PDU synchronization control function".
  • the PDU it receives from PATH-1 is inserted into the tail of the MAC-hs PDU queue, and the PDU received from PATH-2 is inserted into the queue.
  • the cell B data is filled between the PDU No. 99 and the PDU at the 100th position, it is completely synchronized with the PDU queue status of the cell A.
  • cell A continues to transmit data to the UE as the primary cell.
  • PDU queue status has changed, such as: 600-700 and 710 750 two-segment PDUs in the figure above.
  • the confirmation of the UE has been successfully obtained, refer to FIG. 8.
  • PDU confirmation status synchronization information includes a mapping (bitmap) with a total of (750-600 + 1) bits, where the values of bits 102-109 are 0 , The value of other bits is 1.
  • the cell receives the above synchronization information from PATH-2, and marks the PDUs at the corresponding positions in its PDU queue. At this time, the PDU queues of the two cells maintain synchronization.
  • the UE Assume that as the UE moves at this time, it wants to change the primary cell to cell B, then it sends an uplink signaling containing the cell B identity. This message was received by both Cell A and Cell B.
  • Cell A finds that its identity is different from the cell identity selected by the UE, that is, it stops sending data to the UE.
  • cell B finds that it has been selected, and then starts transmitting its unacknowledged PDU from the head of its PDU queue.
  • the PDUs are serial numbers 701 to 709 and serial numbers greater than 750. In this process, the PDU data received by the UE is continuous and smooth.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention concerne un procédé permettant d'augmenter la sélection de cellules lors de la procédure d'accès pour des paquets téléchargés à haute vitesse. Selon ledit procédé, dans une procédure FCS d'un HSDPA, une information de synchronisation de l'état de transmission PDU entre des cellules est transférée par l'intermédiaire d'une voie de transmission IP, entre une station de base et une autre station. Lorsqu'une nouvelle cellule entre en action, la PDU non confirmée dans MAC-Hs est transmise à partir de la voie, entre les stations de base, à la nouvelle cellule, par une station de base maîtresse, tandis qu'une nouvelle PDU est également transmise à la nouvelle cellule par RNC, la procédure de synchronisation de la nouvelle cellule avec une autre cellule étant accélérée par téléchargement simultané de deux PDU. Ainsi, l'invention améliore la continuité de la transmission de données dans la procédure FCS, accélère la procédure de synchronisation de la file d'attente de PDU entre les cellules en action, accélère la procédure d'introduction de données dans des cellules venant d'entrer en action, et réduit la surcharge de signalisation entre un RNC et un noeud B.
PCT/CN2002/000154 2001-09-19 2002-03-13 Procede d'augmentation de la rapidite de la selection de cellules lors de la procedure d'acces pour des paquets telecharges a haute vitesse WO2003026326A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNB011417935A CN1155183C (zh) 2001-09-19 2001-09-19 提高高速下行包接入过程中的快速小区选择性能的方法
CN01141793.5 2001-09-19

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Cited By (2)

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DE10230400A1 (de) * 2002-07-05 2004-01-22 Siemens Ag Verfahren zur Übertragung von Datenpaketen in einem Mobilfunksystem und entsprechendes Mobilfunksystem
US7627317B2 (en) 2002-07-05 2009-12-01 Siemens Akiengesellschaft Method for the transmission of data packets in a mobile radio system and corresponding mobile radio system

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TW200420163A (en) 2002-04-05 2004-10-01 Interdigital Tech Corp Node B and RNC actions during a serving HSDPA cell change
KR100866225B1 (ko) * 2005-10-05 2008-10-30 삼성전자주식회사 고속 순방향 패킷 접속 시스템을 위한 셀 선택 방법 및 장치
CN100426799C (zh) * 2006-02-28 2008-10-15 华为技术有限公司 一种高速下行包接入硬切换方法和***
CN101247547B (zh) * 2007-02-13 2011-08-17 华为技术有限公司 传送控制帧和链路建立方法、通信***、控制器和基站
US9112815B2 (en) * 2012-06-15 2015-08-18 Qualcomm Incorporated Three-phase-polarity safe reverse link shutdown
US9711041B2 (en) 2012-03-16 2017-07-18 Qualcomm Incorporated N-phase polarity data transfer
US8064535B2 (en) 2007-03-02 2011-11-22 Qualcomm Incorporated Three phase and polarity encoded serial interface
US9231790B2 (en) 2007-03-02 2016-01-05 Qualcomm Incorporated N-phase phase and polarity encoded serial interface
CN103891348A (zh) 2012-09-29 2014-06-25 华为技术有限公司 高速媒体接入控制实体的重置方法及相关装置

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EP1059820A2 (fr) * 1999-06-10 2000-12-13 Nokia Mobile Phones Ltd. Procédé et appareil pour le changement rapide de cellule dans un système radio à commutation de paquets
WO2001063775A2 (fr) * 2000-02-24 2001-08-30 Siemens Information And Communication Networks S.P.A. Procede servant a optimiser les procedures d'acces selectif dans les reseaux cellulaires amdc

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WO2001063775A2 (fr) * 2000-02-24 2001-08-30 Siemens Information And Communication Networks S.P.A. Procede servant a optimiser les procedures d'acces selectif dans les reseaux cellulaires amdc

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DE10230400A1 (de) * 2002-07-05 2004-01-22 Siemens Ag Verfahren zur Übertragung von Datenpaketen in einem Mobilfunksystem und entsprechendes Mobilfunksystem
DE10230400B4 (de) * 2002-07-05 2004-10-28 Siemens Ag Verfahren zur Übertragung von Datenpaketen in einem Mobilfunksystem und entsprechendes Mobilfunksystem
US7627317B2 (en) 2002-07-05 2009-12-01 Siemens Akiengesellschaft Method for the transmission of data packets in a mobile radio system and corresponding mobile radio system

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CN1155183C (zh) 2004-06-23

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