WO2010139088A1 - Procede, equipement utilisateur et station de base pour une transmission de services en continu - Google Patents

Procede, equipement utilisateur et station de base pour une transmission de services en continu Download PDF

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Publication number
WO2010139088A1
WO2010139088A1 PCT/CN2009/000611 CN2009000611W WO2010139088A1 WO 2010139088 A1 WO2010139088 A1 WO 2010139088A1 CN 2009000611 W CN2009000611 W CN 2009000611W WO 2010139088 A1 WO2010139088 A1 WO 2010139088A1
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WO
WIPO (PCT)
Prior art keywords
data unit
enodeb
retransmission
data
unit
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Application number
PCT/CN2009/000611
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English (en)
Chinese (zh)
Inventor
晁华
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上海贝尔股份有限公司
阿尔卡特朗讯
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Filing date
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Application filed by 上海贝尔股份有限公司, 阿尔卡特朗讯 filed Critical 上海贝尔股份有限公司
Priority to PCT/CN2009/000611 priority Critical patent/WO2010139088A1/fr
Priority to CN200980157458.5A priority patent/CN102334358B/zh
Publication of WO2010139088A1 publication Critical patent/WO2010139088A1/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 the field of wireless communications, and in particular, to a service continuous transmission method for a single cell EMBMS service, and a user equipment and a base station implementing the method.
  • Background technique
  • the main disadvantage of this scheme is that only this scheme is only applicable when the number of UEs is limited. This is because the unicast network controlled handoff procedure requires the UE to transition to the RRC connected state. Therefore, if a large number of UEs receive MBMS services at the same time, a large amount of signaling load will be introduced into the system. Therefore, for this existing scheme, there is a tradeoff between the number of UEs that can optimize service retransmission and the signaling load in the network.
  • the main concern of the service retransmission problem is to resolve the packet loss problem that may occur during the handover process.
  • the data loss is caused by the asynchronous single cell transmission, that is, each base station enodeB that transmits the EMBMS service in a single cell manner transmits the service data independently, and the absolute time for transmitting the same data is different, and has the asynchronous feature.
  • the UE moves from the base station eNodeB A to the base station eNodeB B.
  • the existing solution does not include the user plane/control plane processing design to resolve packet loss by reusing the assumption of unicast handoff. However, the inventor does not think so.
  • the target cell will have both a dedicated unicast bearer for data forwarding established for each handover UE (dotted line in Figure 1) and an MBMS PTM (Point To Multipoint) for SC transmission (point-to-multipoint) ) Bearer (dotted line in Figure 1).
  • MBMS PTM Point To Multipoint
  • SC transmission point-to-multipoint
  • Bearer dotted line in Figure 1
  • the PDCP (packet data convergence protocol) protocol layer of the MBMS gateway (GW) assembles the data packets sent by the upper layer into PDCP PDUs (protocol data unit) and then uses RLC— UM_DATA_REQ sent to RNode (radio link control) protocol layer of the eNodeB.
  • PDCP PDUs protocol data unit
  • RLC— UM_DATA_REQ radio link control protocol layer of the eNodeB.
  • the same PDCP PDU is sent to all eNodeBs in the MBMS service area. Since the eNodeB processes the received PDCP PDU independently, it is possible to obtain different RLC PDUs, so the retransmission data should be a PDCP PDU.
  • the eNodeB deletes the RLC SDU after the air interface sends the RLC SDU.
  • data forwarding during the handover process is a specific operation for the UE, and thus is a waste of resources for the EMBMS service.
  • the inventors have proposed a concept of applying timer-based retransmission in a single-cell EMBMS service scenario to replace data forwarding between different eNodeBs to optimize service continuity.
  • a service retransmission method for switching a service from a source base station eNodeB to a user equipment UE to a service transmitted by a target eNodeB to the UE, the service retransmission method comprising the steps of: The UE sends a cell update message to the target eNodeB, where the cell update message includes the sequence number of the data unit that the UE finally received from the source eNodeB, and the target eNodeB according to the sequence number included in the cell update message received from the UE and the data currently processed by the UE.
  • the target eNodeB sends a cell update confirmation message to the UE, where the cell update confirmation message includes a retransmission indicator,
  • the retransmission indicator indicates the retransmission determination result of the target eNodeB.
  • the step of determining whether retransmission is required when the sequence number received from the UE is smaller than the sequence number of the data unit currently processed by the target eNodeB, determining that the retransmission is required, and the sequence number is greater than the data unit of the sequence number received from the UE Determine the data to be retransmitted.
  • the target eNodeB deletes the data unit from the buffer when a predetermined period of time has elapsed after transmitting the data unit.
  • the service resume transmission method further comprises the step of: the target eNodeB transmitting, to the UE, the data unit determined to be retransmitted.
  • the target eNodeB transmits the data unit to be retransmitted and the data unit to be normally transmitted in a time division multiplexed manner.
  • the target eNodeB jointly encodes the data unit to be normally transmitted and the data unit to be retransmitted, and uses the shared resource to transmit the data unit to be normally transmitted and the data unit to be retransmitted.
  • the joint encoding comprises a dirty paper encoded DPC.
  • the service resume transmission method is used for a single-cell EMBMS service system.
  • a user equipment UE comprising: a sending unit, configured to send a cell update message to a target base station eNodeB, where the cell update message includes a sequence number of a data unit that the UE finally correctly receives from the source eNodeB.
  • the receiving unit receives a cell update confirm message from the target eNodeB, where the cell update acknowledge message includes a retransmission indicator to indicate to the UE whether the target eNodeB performs retransmission of the data unit.
  • the user equipment further includes: a decoding unit, configured to decode data received from the target eNodeB according to the retransmission indicator.
  • a decoding unit configured to decode data received from the target eNodeB according to the retransmission indicator.
  • the decoding unit decodes the data received from the target eNodeB by using a decoding method corresponding to the encoding method used by the target eNodeB.
  • a base station eNodeB comprising: a receiving unit, receiving a cell update message from a UE, the cell update message including a data unit that the UE finally correctly receives from another eNodeB that is a source eNodeB a sending unit, configured to send a cell update confirmation message to the UE and a data unit to be normally transmitted; a buffer, configured to buffer the data unit that has been sent; and a retransmission determining unit, according to the cell update received from the UE Determining whether the data unit that has been sent in the buffer needs to be retransmitted, and the retransmission indicator, the retransmission indicator The indicator indicates a retransmission determination result of the retransmission determination unit.
  • the retransmission determining unit determines that retransmission is required, and determines that the data unit whose sequence number is greater than the sequence number received from the UE is determined to be retransmitted.
  • the data is not limited to the sequence number received from the UE.
  • the device is deleted from the buffer The data unit.
  • the transmitting unit further transmits to the UE a data unit determined by the retransmission determining unit to be retransmitted.
  • the transmitting unit transmits the data unit to be normally transmitted by the data unit to be retransmitted by means of time division multiplexing.
  • the data unit to be normally transmitted and the data unit to be retransmitted are transmitted by using the shared resource by jointly coding the data unit to be normally transmitted and the data unit to be retransmitted.
  • the joint encoding comprises a dirty paper encoded DPC.
  • the user equipment and base station eNodeB according to the present invention are for a single cell EMBMS service system.
  • the present invention achieves the following advantages -
  • Application DPC further improves the utilization of resources.
  • FIG. 1 is a schematic diagram showing a data forwarding process of a conventional single cell transmission
  • Figure 2 shows a schematic diagram of a protocol stack of MBMS
  • FIG. 3 is a schematic diagram showing a service resume transmission method for a cell update procedure according to an embodiment of the present invention
  • FIG. 4 shows a block diagram of a UE according to an embodiment of the present invention
  • Figure 5 shows a block diagram of an eNodeB in accordance with an embodiment of the present invention
  • TDM time division multiplexing
  • FIG. 7 is a functional diagram of a transmitter of an eNodeB according to a second embodiment of the present invention.
  • FIG. 8 shows a channel structure of a DPC-based retransmission; and
  • FIG. 9 shows a UE according to a second embodiment of the present invention. Functional diagram of the receiver. detailed description
  • the method, user equipment and base station according to the present invention will be described below by taking a single-cell EMBMS service transmission scenario as an example.
  • the method, user equipment and base station of the present invention are not limited to a single cell EMBMS service system.
  • FIG. 3 shows a schematic diagram of a service resume transmission method for a cell update procedure according to an embodiment of the present invention.
  • 4 and 5 respectively show block diagrams of UEs and eNodeBs for implementing the service retransmission method shown in FIG. 3, in accordance with an embodiment of the present invention.
  • the UE transmits a cell update message to the target eNodeB.
  • the UE reports to the target eNodeB the sequence number (SN) of the data unit PDCP PDU that was correctly received from the source eNodeB through the cell update message, the sequence number. Indicates the order of PDCP PDUs. Retransmission is only required when the target eNodeB sends the same MBMS service faster than the source eNodeB, that is, the SN of the PDCP PDU processed by the target eNodeB is greater than the SN reported by the UE.
  • the target eNodeB can know if it is faster than the source eNodeB to send the packet and determine whether to retransmit the data unit indicated as lost to the newly joined UE.
  • the eNodeB feeds back the cell update confirmation message to the UE.
  • the cell update acknowledgment message includes a retransmission indicator
  • the target eNodeB sets a retransmission indicator according to the determination result of whether retransmission is required to indicate to the UE whether retransmission data needs to be received.
  • the data retransmission according to the invention may be a specific retransmission for the MBMS service, i.e. the target eNodeB determines from which data unit PDCP PDU the retransmission needs to be based on the signalling from the plurality of UEs.
  • the retransmission data is broadcast to all UEs that need to receive retransmitted data.
  • the retransmission data may be transmitted in a manner that time division multiplexed TDM or shares the same resources as a normal SC transmission. If TDM will be The multiplexing is used for retransmission, and the target cell allocates retransmission data and normal SC data in different subframes, as shown in FIG. 6.
  • FIGS. 4 and 5 are block diagrams showing UEs and eNodeBs for implementing a service retransmission method for a cell update procedure according to the present invention, in accordance with an embodiment of the present invention.
  • the UE 200 includes a transmitting unit 20, a receiving unit 22, and a decoding unit 24. These units have well-known functions.
  • the sending unit 20 is configured to send a message and data to the eNodeB to which the UE 200 belongs.
  • the receiving unit 22 is configured to receive messages and data from the eNodeB.
  • the decoding unit 24 decodes the data received by the receiving unit 22.
  • the UE 200 also includes other units, such as a processing unit, a display unit, etc., and only the units related to the present invention are shown here to avoid obscuring the present invention.
  • the eNodeB 100 includes a transmitting unit 10, a receiving unit 12, and a decoding unit 14. These units have well-known functions.
  • the transmitting unit 10 transmits service data and control signaling to the UEs in the cell.
  • the receiving unit 12 receives signaling and traffic data from the gateway and the UE.
  • the decoding unit 14 decodes the data received by the receiving unit 12.
  • the eNodeB 100 also includes other units, such as processing units, coding units, etc., and only the units related to the present invention are shown herein to avoid obscuring the present invention.
  • the eNodeB 100 further includes a buffer 16 and a retransmission determining unit 18 for storing data units that have been transmitted to the UE.
  • Each eNodeB has a buffer for each EMBMS service for each cell. This type of buffer is called a mobile buffer and is used to store data that may be retransmitted, thereby ensuring business continuity in the case of single cell movement.
  • the RLC SDU that has been transmitted will remain in the mobile buffer for a period of time.
  • the specific length of the time period is configured by the operator, and is represented as T MBMSM.
  • the retransmission determining unit 18 is configured to determine which data units to be buffered in the buffer 16 need to be retransmitted based on the information from the user equipment.
  • the transmitting unit 20 of the UE 200 transmits a cell update message to the target eNodeB 100, the cell
  • the update message includes the sequence number of the data unit that the UE last correctly received from the source eNodeB.
  • the retransmission determining unit 18 determines whether retransmission is required according to the sequence number included in the cell update message received from the UE and the sequence number of the data unit currently processed by the eNodeB 100 itself. The data unit cached in the buffer. When the sequence number received from the UE is smaller than the sequence number of the currently processed data unit, the retransmission determination unit 18 determines that the retransmission buffer is required. The sequence number in the device is greater than the data unit received from the UE and less than the current data unit currently processed by the target eNodeB.
  • the sending unit 10 sends a cell update confirm message to the UE, the cell update confirming cell includes a retransmission indicator, and the retransmission indicator indicates a retransmission determination result of the retransmission confirming unit.
  • the transmitting unit 10 also sends the data unit to be retransmitted and the data unit that is normally transmitted to the UE, and the data unit that is normally transmitted, that is, the data unit to be normally transmitted after the data unit currently processed by the target eNodeB, that is, the SC transmission. While transmitting the normally transmitted data unit, it is stored in the buffer 16, and a timer is triggered at the same time, and the data unit is deleted from the buffer 16 when the timer reaches the deadline set by the operator.
  • the receiving unit 22 of the UE 200 receives the cell update confirmation message and receives the service data from the eNodeB 100.
  • the decoding unit 24 decodes the received service data to obtain a retransmitted data unit and a normally transmitted data unit. For a UE that does not move in the target cell, there is no need to decode the retransmitted data unit.
  • the operation of the eNode B is as follows:
  • the timer for T MBMSM0 is started and the PDCP PDU is moved into the mobile buffer. Once the timer expires, the corresponding PDU is deleted in the move buffer.
  • the eNodeB transmits SC service data in the cell. If the eNodeB receives the cell update message from the mobile UE, and the SN of the MBMS PDCP PDU of the mobile UE is smaller than the SN of the PDCP PDU processed by the eNodeB, it is necessary to construct the retransmission data by using SC retransmission.
  • FIG. 6 shows an example of a service resume transmission method using time division multiplexing (TDM) for retransmission data and normal SC data according to the first embodiment of the present invention.
  • TDM time division multiplexing
  • the eNodeB uses TDM for retransmission, and distributes retransmission data and normal SC data in separate RLC PDUs, thereby implementing service retransmission.
  • the continuity of the single cell EMBMS service is ensured.
  • the operation of the UE is as follows:
  • the UE reports the SN of the MBMS PDCP PDU that was correctly received from the source eNodeB to the target eNodeB through the cell update message.
  • the UE detects a retransmission indicator in the cell update confirmation message fed back by the eNodeB. If the indicator indicates "Yes", the UE knows that it needs to prepare to decode the MSMB to retransmit the data. If the indicator indicates "No", the UE does not perform a special operation.
  • the UE decodes the retransmitted data.
  • the decoding process is the same as in the prior art.
  • the operation of the eNodeB is as follows:
  • This operation is the same as that in the first embodiment.
  • the eNodeB application shares resources to transmit retransmission data and normal SC data.
  • the eNodeB jointly encodes the retransmitted data and the normal data, and transmits the encoded data stream.
  • DPC Densty Paper Coding
  • the DPC indicates the following principle: Once the encoder knows all the information of the noise sequence, the channel capacity is not affected [Non-Patent Document 3]. The encoder does not need to cancel the noise, but instead uses it to select the codeword for the useful information. In this case, the retransmission data and the normal SC data in the target cell are allocated through different transmission channels.
  • DPC can be applied to retransmit data streams (first option) or SC data streams (second option).
  • first option data streams
  • SC data streams second option.
  • the design complexity of the transmitter for these two options is the same. It is foreseeable that retransmissions due to UE movement will not always occur. Therefore, the previous option saves the encoding process of the transmitter, but at the cost of the processing of the receiver of the UE in a single cell.
  • the transmitter of the eNodeB constructs the air interface data through the DPC, as shown in FIG. 7, and informs the UE when the DPC decoding will be performed by MCCH signaling, as shown in FIG. 7 is a functional diagram showing a transmitter (including a function of a transmitting unit 10 and a coding unit (not shown), etc.) of an eNodeB according to a second embodiment of the present invention;
  • FIG. 8 shows a DPC-based retransmission channel. structure.
  • the SC data stream and the retransmitted data stream are independently encoded as a "noise" sequence S and an information sequence W.
  • D is coded into transmission sequence X using S.
  • X and S are then superimposed together and mapped onto the OFDM subcarriers along with control signaling.
  • the operation of the UE is as follows:
  • This operation is the same as that in the first embodiment. If the indicator indicates "Yes”, the UE knows that it needs to prepare to decode the MSMB retransmission data. If the indicator indicates "No", the UE does not perform a special operation.
  • the UE receives the encoded data stream and decodes the data stream to obtain retransmitted data and normal data.
  • the operation of the UE is as follows.
  • the UE reads the MCCH to know when to start decoding the DPC.
  • the receiver of the UE (including the functions of the receiving unit 22 and the decoding unit 24, etc.) is designed to decode the retransmitted data.
  • Fig. 9 is a diagram showing the function of a receiver of a UE according to a second embodiment of the present invention.
  • the received signal is converted to a received sequence Y by Fourier transform FFT.
  • the channel estimation process is used to remove the effect of the channel on the received sequence.
  • DPC decoding is performed to obtain a sequence of decoded information, that is, data is retransmitted.
  • UEs For UEs that are already in the target single cell, they do not need to perform DPC decoding to obtain the sequence. After channel estimation using the pilot signal of MBMS, a "noise" sequence can be obtained. Then, normal decoding and demodulation are performed to obtain normal SC data.
  • Non-Patent Document 3 Max HM Costa, "Writing on dirty paper coding", IEEE Transaction. Inform. Theory. 1983 Compared with the prior art, the service renewal method according to the present invention makes service renewal possible and realizes The following effects:
  • the method according to the present invention can perform retransmission based on traffic, thereby saving a large amount of radio resources;
  • the eNodeB has DPC encoding capabilities.
  • the application of DPC allows the retransmitted data stream to use SC-PTM streams for codeword creation rather than as interference.
  • the UE has a DPC decoding function.
  • the application of DPC enables mobile UEs and camping UEs within a single cell to receive the data they need.
  • the EMBMS logical control channel informs the UE that there is a retransmission for the mobile, the UE detects when (the start of the DPC) and how to decode and decode the received signal (if different from the SC-PTM data stream, for the retransmitted data stream) Indexed for modulation/coding mode).

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

Abstract

La présente invention concerne un procédé de transmission de services en continu, et appliqué à la commutation du service de transmission depuis un nœud B évolué d'une station de base source à un équipement utilisateur vers le service de transmission depuis un nœud B évolué d'une station de base cible à l'équipement utilisateur, le procédé de transmission de services en continu comprenant les étapes suivantes : la transmission par l'équipement utilisateur d'un message de mise à jour au nœud B évolué cible, le message de mise à jour de cellule contenant le numéro de série de l'unité de données que l'équipement utilisateur a reçu correctement depuis le nœud B évolué source précédemment ; la détermination par le nœud B évolué cible pour savoir s'il faut retransmettre l'unité de données mémorisée dans la mémoire cache du nœud B évolué cible et déjà transmise selon le numéro de série contenu dans le message de mise à jour de cellule reçu depuis l'équipement utilisateur et le numéro de série de l'unité de données en cours de traitement par lui-même ; la transmission par le nœud B évolué cible d'un message de confirmation de mise à jour, le message de confirmation de mise à jour contenant un indicateur de retransmission, et l'indicateur de retransmission indiquant le résultat de la détermination du nœud B évolué cible. L'invention concerne également un équipement utilisateur et une station de base pour la mise en œuvre du procédé ; ainsi la retransmission spéciale de données pour l'équipement utilisateur est modifiée en la retransmission spéciale pour un service EMBMS à cellule unique et permet une grande économie de ressources.
PCT/CN2009/000611 2009-06-01 2009-06-01 Procede, equipement utilisateur et station de base pour une transmission de services en continu WO2010139088A1 (fr)

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PCT/CN2009/000611 WO2010139088A1 (fr) 2009-06-01 2009-06-01 Procede, equipement utilisateur et station de base pour une transmission de services en continu
CN200980157458.5A CN102334358B (zh) 2009-06-01 2009-06-01 服务续传方法、用户设备和基站

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PCT/CN2009/000611 WO2010139088A1 (fr) 2009-06-01 2009-06-01 Procede, equipement utilisateur et station de base pour une transmission de services en continu

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CN103260195A (zh) * 2012-02-17 2013-08-21 华为技术有限公司 视频业务数据传输方法及装置
CN105453645A (zh) * 2014-07-23 2016-03-30 华为技术有限公司 一种数据包发送、数据处理装置及方法

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WO2017156792A1 (fr) * 2016-03-18 2017-09-21 Qualcomm Incorporated Transmission de nouvelles données dans une retransmission de demande de répétition automatique hybride (harq) avec des transmissions codées polaires
EP4080912B1 (fr) * 2019-12-31 2024-03-20 Huawei Technologies Co., Ltd. Appareils et procédés d'envoi et de réception de multidiffusion
CN113973266B (zh) * 2020-07-23 2023-12-19 维沃移动通信有限公司 信息接收方法、发送方法、会话建立方法、装置和设备
CN117835340A (zh) * 2022-09-28 2024-04-05 华为技术有限公司 通信方法和装置

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CN101047979A (zh) * 2006-03-30 2007-10-03 华为技术有限公司 一种避免重复发送自动重传请求数据的处理方法

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EP1549097A1 (fr) * 2003-02-18 2005-06-29 Fujitsu Limited Station radio fixe et systeme de communication mobile
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CN103260195B (zh) * 2012-02-17 2016-06-08 华为技术有限公司 视频业务数据传输方法及装置
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CN105453645B (zh) * 2014-07-23 2020-01-21 华为技术有限公司 一种数据包发送、数据处理装置及方法

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