WO2014166053A1 - 一种通讯方法和终端 - Google Patents

一种通讯方法和终端 Download PDF

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Publication number
WO2014166053A1
WO2014166053A1 PCT/CN2013/073943 CN2013073943W WO2014166053A1 WO 2014166053 A1 WO2014166053 A1 WO 2014166053A1 CN 2013073943 W CN2013073943 W CN 2013073943W WO 2014166053 A1 WO2014166053 A1 WO 2014166053A1
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WO
WIPO (PCT)
Prior art keywords
pdu
base station
rlc entity
entity
terminal
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Application number
PCT/CN2013/073943
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English (en)
French (fr)
Inventor
钟涛
张宏平
曾清海
戴明增
Original Assignee
华为技术有限公司
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.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201380002600.5A priority Critical patent/CN104685930B/zh
Priority to PCT/CN2013/073943 priority patent/WO2014166053A1/zh
Priority to CN201910076001.7A priority patent/CN109714136B/zh
Publication of WO2014166053A1 publication Critical patent/WO2014166053A1/zh
Priority to US14/875,384 priority patent/US10165615B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/19Connection re-establishment
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/22Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1825Adaptation of specific ARQ protocol parameters according to transmission conditions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/1893Physical mapping arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/20Selecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453Resources in frequency domain, e.g. a carrier in FDMA
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/15Setup of multiple wireless link connections
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/18Management of setup rejection or failure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092Error control systems characterised by the topology of the transmission link
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices

Definitions

  • the present invention relates to the field of mobile communications technologies, and in particular, to a RLC (Radio Link Control) data retransmission communication method and terminal for implementing carrier aggregation (CA).
  • CA carrier aggregation
  • the component carrier performs uplink and downlink communication, that is, the UE communicates with the network on multiple cells at the same time, and each cell uses a carrier different from other cells to support high-speed data transmission; and in all of these aggregations Among the cells, one is the primary cell and the other is the secondary cell.
  • the carrier aggregation of the LTE system can be classified into intra-base station cell aggregation and inter-base station cell aggregation according to the location of the base station.
  • the cell aggregation in the base station means that the serving cells aggregated by the UE belong to the same base station.
  • the cell aggregation between the base stations means that the aggregated serving cells belong to different base stations. This aggregation mode can bring about a better user experience.
  • the embodiment of the present invention provides a data retransmission communication method and a terminal for implementing inter-base station carrier aggregation, which can reduce the frequency of RRC connection re-establishment of the UE in a carrier aggregation scenario between base stations, thereby avoiding data packet loss, thereby improving user experience. .
  • a first aspect of the present invention provides a communication method, and a first implementation manner thereof includes:
  • the first radio link control RLC entity of the terminal receives the packet data unit PDU; when the first RLC When the entity determines that the PDU reaches the maximum number of retransmissions, the first RLC entity instructs the second RLC entity of the terminal to transmit the PDU, where the first RLC entity corresponds to the first base station, and the second RLC The entity corresponds to the second base station.
  • the first radio link control RLC entity of the terminal receives the packet data unit PDU, and the method includes: the first RLC entity receiving the public packet data convergence protocol of the terminal, sent by the PDCP entity The PDU data.
  • the first radio link control RLC entity of the terminal receives the packet data unit PDU, and the method includes: the first RLC entity receiving the the first PDCP entity sent by the terminal PDU.
  • the first RLC entity instructing the second RLC entity of the terminal to transmit the PDU includes: sending, by the first RLC entity, a retransmission indication to the public PDCP entity, where The retransmission indication includes PDU information; the retransmission indication is used to instruct the second RLC entity to transmit the PDU.
  • the first RLC entity instructing the second RLC entity of the terminal to transmit the PDU includes: sending, by the first RLC entity, a retransmission indication to the first PDCP entity,
  • the retransmission indication includes PDU information; the retransmission indication is used to instruct the second RLC entity to transmit the PDU.
  • the PDU information is at least one of the following: a data packet of the PDU; a sequence number of the PDU.
  • the first base station is a primary base station and the second base station is a secondary base station; or the first base station is a secondary base station and the second base station is a primary base station.
  • a terminal where a possible implementation manner includes: a first radio link control RLC entity, configured to receive a packet data unit PDU, and determine that the PDU reaches a maximum number of retransmissions; An RLC entity, configured to: when the first RLC entity determines that the PDU reaches a maximum number of retransmissions, retransmit the PDU according to the indication of the first RLC entity; where the first RLC entity corresponds to the first base station The second RLC entity corresponds to the second base station.
  • a first radio link control RLC entity configured to receive a packet data unit PDU, and determine that the PDU reaches a maximum number of retransmissions
  • An RLC entity configured to: when the first RLC entity determines that the PDU reaches a maximum number of retransmissions, retransmit the PDU according to the indication of the first RLC entity; where the first RLC entity corresponds to the first base station The second RLC entity corresponds to the second base station.
  • the terminal further includes: a public packet data convergence protocol (PDCP) entity, configured to connect the first RLC entity and the second RLC entity, respectively, to send the PDU data.
  • PDCP packet data convergence protocol
  • the terminal further includes: a first PDCP entity, which is respectively connected to the first RLC entity and the second RLC entity, and configured to send the PDU to the first RLC entity.
  • the first RLC entity is specifically configured to send a retransmission indication to the public PDCP entity, where the retransmission indication includes PDU information, and the retransmission indication is used to indicate the The second RLC entity retransmits the PDU.
  • the first RLC entity is specifically configured to send a retransmission indication to the first PDCP entity, where the retransmission indication includes PDU information, and the retransmission indication is used to indicate the The second RLC entity retransmits the PDU.
  • the PDU information is at least one of the following: a data packet of the PDU; a sequence number of the PDU.
  • the first base station is a primary base station and the second base station is a secondary base station; or the first base station is a secondary base station and the second base station is a primary base station.
  • the RRC connection re-establishment process is not initiated by the secondary base station, but the RLC entity of the host station side is notified to retransmit the The PDUs that reach the maximum number of retransmissions are used, thereby reducing the frequency at which the UE performs RRC connection re-establishment, further avoiding data packet loss caused by frequent re-establishment, thereby improving the user experience.
  • FIG. 1 is a schematic flowchart of a communication method for implementing carrier aggregation data retransmission between base stations according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of another communication method for implementing carrier aggregation data retransmission between base stations according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a terminal for implementing retransmission of carrier aggregation data between base stations according to an embodiment of the present invention
  • a terminal a device that provides voice and/or data connectivity to a user, including a wireless terminal or a wired terminal.
  • the line terminal can be a handheld device having a wireless connection function, or another processing device connected to the wireless modem, and a mobile terminal that communicates with one or more core networks via the wireless access network.
  • the wireless terminal can be a mobile phone (or "cellular" phone) and a computer with a mobile terminal.
  • the wireless terminal can also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device.
  • the wireless terminal can be a mobile station (English: mobile station), an access point (English: access point), or a user equipment (English: user equipment, referred to as UE).
  • a base station may refer to a device in an access network that communicates with a wireless terminal over one or more cells on an air interface.
  • the base station may be a base station in GSM or CDMA (base transceiver station, BTS for short), or a base station in WCDMA (in English: NodeB), or an evolved base station in LTE (in English: The evolutional Node B, which is referred to as e B or e-NodeB, or the base station in the subsequent evolved network, is not limited by the present invention.
  • An embodiment of the present invention provides a communication method. As shown in FIG. 1, the method includes:
  • Step 110 The first RLC entity of the terminal receives a PDU (Packet Data Unit).
  • the first RLC entity of the terminal may receive the PDU data sent by the upper layer entity of the first RLC entity, and the RLC entity corresponding to the secondary base station in the terminal is used as the first RLC entity of the terminal.
  • the specific RLC entity of the terminal corresponding to the primary base station is used as the second RLC entity of the terminal as an example, but is not limited thereto.
  • the terminal protocol stack when there is a public RRC entity and a Packet Data Convergence Protocol (PCCP) entity in the terminal protocol stack, in the scenario of carrier aggregation between the base stations, there are corresponding primary and secondary base stations respectively in the terminal.
  • Two RLC protocol entities when there is uplink data transmission, the data packet on the data radio bearer is offloaded to the RLC entity of the corresponding primary base station and the RLC entity of the corresponding secondary base station by the common PDCP entity; therefore, the corresponding auxiliary in this embodiment
  • the RLC entity of the base station may receive the PDU data sent by the public PDCP entity, and the PDU data may be sent by the public PDCP entity to perform header compression, numbering, and encryption, and the specific header compression, numbering, or encryption operation may be performed.
  • the existing mode is performed, and the embodiment is not described herein again.
  • the terminal protocol stack has a common RRC entity but does not have a common PDCP entity
  • the PDCP entity transparently transmits the RLC PDU received from the corresponding primary base station RLC entity to the RLC entity of the corresponding secondary base station; therefore, the RLC entity corresponding to the secondary base station
  • Step 120 When the first RLC entity determines that the PDU reaches the maximum number of retransmissions, the first RLC entity instructs the second RLC entity of the terminal to transmit the PDU, where the first RLC entity corresponds to The first base station, the second RLC entity corresponds to the second base station.
  • the terminal determines that a radio link failure has occurred; but in this embodiment, The RRC connection re-establishment process is not initiated by the secondary base station, but the RLC entity of the corresponding primary base station is notified to retransmit the PDU that reaches the maximum number of retransmissions, thereby reducing the frequency at which the terminal performs RRC connection re-establishment, further avoiding frequent heavy The resulting data loss is created, which improves the user experience.
  • the RLC entity corresponding to the secondary base station may receive the PDU data sent by different upper layer entities.
  • the RLC entity of the corresponding primary base station may be retransmitted to the PDU of the maximum number of retransmissions, as follows: Said, but not limited to:
  • the RLC entity of the corresponding secondary base station After the RLC entity of the corresponding secondary base station detects that the RLC PDU reaches the maximum number of retransmissions, it first notifies the public PDCP entity to retransmit the data packet; specifically, the RLC entity corresponding to the secondary base station sends a message to the public PDCP entity.
  • the indication resends the PDU to an RLC entity of the host station, and the RLC entity of the corresponding primary base station retransmits the PDU according to the pre-allocated SN.
  • the PDU information returned by the RLC entity corresponding to the secondary base station to the common PDCP entity should include at least the data packet or the data packet number of the PDU.
  • the PDCP entity corresponding to the secondary base station After the RLC entity of the corresponding secondary base station detects that the RLC PDU reaches the maximum number of retransmissions, the PDCP entity corresponding to the secondary base station sends a retransmission indication to the RLC entity corresponding to the primary base station, where the retransmission indication includes the arrival.
  • the information of the PDU of the maximum number of retransmissions after the RLC entity of the corresponding primary base station receives the retransmission indication returned by the PDCP entity of the corresponding secondary base station, and retransmits the PDU according to the pre-allocated SN.
  • the PDU information included in the retransmission indication sent by the PDCP entity corresponding to the secondary base station to the RLC entity corresponding to the primary base station should include at least the data packet or the data packet number of the PDU.
  • the first base station is a primary base station and the second base station is a secondary base station; or, the first base station is a secondary base station, and the second base station is a primary base station.
  • Methods include:
  • the public PDCP entity performs header compression, numbering, and encryption on the upper layer data, and then delivers the data to the RLC entity corresponding to the secondary base station.
  • step S220 The RLC entity corresponding to the secondary base station sends the RLC PDU to the MAC entity of the corresponding secondary base station, and detects whether the PDU reaches the maximum number of retransmissions. If yes, step S230 is performed;
  • the RLC entity corresponding to the secondary base station returns the PDU information that reaches the maximum number of retransmissions to the public.
  • S240 The public PDCP entity retransmits the corresponding PDU data packet to the RLC entity of the corresponding primary base station according to the information returned by the RLC entity of the corresponding secondary base station;
  • the RLC entity corresponding to the primary base station sends the RLC PDU to the MAC entity of the corresponding primary base station, and performs data retransmission.
  • the data retransmission communication method for implementing inter-base-station carrier aggregation in the foregoing embodiment is described in detail below by taking another specific data retransmission process as an example.
  • the method includes:
  • the PDCP entity corresponding to the primary base station performs header compression, numbering, and encryption on the upper layer data, and then delivers the upper layer data to the RLC entity corresponding to the primary base station.
  • the RLC entity corresponding to the primary base station generates an RLC PDU and sends the RLC PDU to the PDCP entity of the corresponding secondary base station.
  • the PDCP entity corresponding to the secondary base station transparently transmits the received RLC PDU to the RLC entity of the corresponding secondary base station;
  • the MAC entity transmits the RLC PDU
  • S360 The PDCP entity corresponding to the secondary base station notifies the RLC entity of the corresponding primary base station to perform retransmission of the PDU;
  • S370 The RLC entity corresponding to the primary base station sends the PDU to the MAC entity of the corresponding primary base station, and completes data retransmission.
  • the primary base station and the secondary base station that perform information exchange with the terminal RLC may be interchanged, that is, the primary base station may perform the action of the secondary base station in the implementation manner, and the secondary base station may also be implemented in the implementation manner. The operation of the primary base station is performed, and details are not described herein again.
  • the terminal determines that the radio link fails, and the terminal initiates an RRC connection re-establishment process.
  • the serving cells aggregated by the terminal in the cell aggregation mode of the base station belong to the same base station and are controlled by only one base station, it is reasonable to initiate the RRC connection re-establishment process when the radio link fails and the terminal initiates the RRC connection re-establishment process;
  • the RRC connection re-establishment initiated by the terminal will inevitably result in the loss of the data packet.
  • the method of the embodiment of the present invention when detecting that the PDU reaches the maximum number of retransmissions, does not initiate the RRC connection re-establishment process by the secondary base station, but notifies the RLC entity on the host station side to retransmit the PDU that reaches the maximum number of retransmissions. Therefore, the frequency of the RRC connection re-establishment of the terminal is reduced, and the data packet loss caused by frequent re-establishment is further avoided, thereby improving the user experience.
  • another embodiment of the present invention also provides a data retransmission terminal for implementing inter-base station carrier aggregation.
  • the terminal 400 includes: a first RLC entity 410 and a second RLC entity 420; among them,
  • the first RLC entity 410 is configured to receive a received packet data unit PDU and determine that the PDU reaches a maximum number of retransmissions; the second RLC entity 420 is configured to: when the first RLC entity determines that the PDU reaches a maximum retransmission And retransmitting the PDU according to the indication of the first RLC entity, where the first RLC entity corresponds to the first base station, and the second RLC entity corresponds to the second base station.
  • the terminal 400 may further include (not shown in the figure): a common packet data convergence protocol PDCP entity, which is respectively connected to the first RLC entity and the second RLC entity, and configured to send to the first RLC entity The PDU data.
  • a common packet data convergence protocol PDCP entity which is respectively connected to the first RLC entity and the second RLC entity, and configured to send to the first RLC entity The PDU data.
  • the terminal 400 may further include (not shown in the figure): a first PDCP entity, which is respectively connected to the first RLC entity and the second RLC entity, and configured to send the foregoing to the first RLC entity PDU.
  • a first PDCP entity which is respectively connected to the first RLC entity and the second RLC entity, and configured to send the foregoing to the first RLC entity PDU.
  • the first RLC entity is specifically configured to send a retransmission indication to the public PDCP entity, where the retransmission indication includes PDU information; and the retransmission indication is used to indicate that the second RLC entity is heavy Pass the PDU.
  • the first RLC entity in this embodiment is specifically configured to send a retransmission indication to the first PDCP entity, where the retransmission indication includes PDU information, and the retransmission indication is used to indicate the The second RLC entity retransmits the PDU.
  • the PDU information should include at least: a data packet of the PDU and/or a sequence number of the PDU. It is to be noted that, in this embodiment, the first base station is the primary base station and the second base station is the secondary base station; or the first base station is the secondary base station and the second base station is the primary base station.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

本发明实施例公开了一种实现基站间载波聚合的数据重传通讯方法和终端;其中,所述方法包括:终端的第一无线链路控制实体RLC接收分组数据单元PDU;当所述第一RLC实体确定所述PDU达到最大重传次数时,所述第一RLC实体指示所述终端的第二RLC实体传输所述PDU;其中,所述第一RLC实体对应第一基站,所述第二RLC实体对应第二基站。采用本实施例的方法和终端,降低了RRC连接重建立的频率,进一步避免了频繁重建立引起的数据丢包,进而提高了用户体验。

Description

一种通讯方法和终端
技术领域
本发明涉及移动通信技术领域,尤其涉及一种实现基站间载波聚合(CA, Carrier Aggregation)的 RLC (Radio Link Control,无线链路控制)数据重传通讯方法和终端。 背景技术 随着移动互联网的发展,对蜂窝通信系统能够提供的服务质量与网络速度的要求 越来越高。为了进一步的提高系统的频谱效率和用户吞吐量,在 LTE-A(LTE-Advanced: LTE后续演进)中引入了载波聚合技术:载波聚合是指用户设备(User Equipment, UE) 可以同时使用多个成员载波(CC, Component Carrier)进行上下行通信, 即 UE同时 在多个小区上和网络进行通信, 每个小区使用一个与其他小区不同的载波, 从而来支 持高速数据传输; 而在所有这些聚合的小区中, 其中一个是主小区, 其他是辅小区。
其中, LTE系统的载波聚合根据基站位置可以分为基站内部小区聚合和基站间小 区聚合等。基站内部的小区聚合是指 UE聚合的服务小区都属于同一个基站; 而基站 间小区聚合是指聚合的服务小区属于不同的基站,此种聚合方式可以带来更好的用户 体验。
在目前的基站间载波聚合场景下, 当 UE通过辅基站 RLC发送的数据达到最大 重传次数时, 此时若判定发生无线链路失败而由 UE 发起 RRC (Radio Resource Control, 无线资源控制) 连接重建立势必会造成数据包的丢失, 从而影响用户体验。 因此, 对于基站间小区聚合方式而言, 当 UE的辅小区 RLC实体检测到重传次数达 到最大值时, 如何防止 UE发起 RRC重建立过程即成为亟待解决的问题。 发明内容
本发明实施例中提供了一种实现基站间载波聚合的数据重传通讯方法和终端,能 降低在基站间载波聚合场景下 UE进行 RRC连接重建立的频率, 避免数据包丢失, 从而提高用户体验。
为解决上述问题, 本发明提供的技术方案如下:
本发明第一方面提供了一种通讯方法, 其第一种实现方式包括:
终端的第一无线链路控制 RLC实体接收分组数据单元 PDU; 当所述第一 RLC 实体确定所述 PDU达到最大重传次数时, 所述第一 RLC实体指示所述终端的第二 RLC实体传输所述 PDU; 其中, 所述第一 RLC实体对应第一基站, 所述第二 RLC 实体对应第二基站。
在一种可能的实现方式中, 所述终端的第一无线链路控制 RLC实体接收分组数 据单元 PDU, 具体包括: 所述第一 RLC实体接收所述终端的公共分组数据汇聚协议 PDCP实体发送的所述 PDU数据。
在另一种可能的实现方式中, 所述终端的第一无线链路控制 RLC实体接收分组 数据单元 PDU, 具体包括: 所述第一 RLC实体接收所述终端的第一 PDCP实体发送 的所述 PDU。
结合第一种可能的实现方式,所述第一 RLC实体指示所述终端的第二 RLC实体 传输所述 PDU,具体包括:所述第一 RLC实体向所述公共 PDCP实体发送重传指示, 所述重传指示包含 PDU信息; 所述重传指示用以指示所述第二 RLC实体传输所述 PDU。
结合第二种可能的实现方式,所述第一 RLC实体指示所述终端的第二 RLC实体 传输所述 PDU,具体包括:所述第一 RLC实体向所述第一 PDCP实体发送重传指示, 所述重传指示包含 PDU信息; 所述重传指示用以指示所述第二 RLC实体传输所述 PDU。
在一种可能的实现方式中,所述 PDU信息为以下至少一种:所述 PDU的数据包; 所述 PDU的序列号。
在一种可能的实现方式中,所述第一基站为主基站和所述第二基站为辅基站;或, 所述第一基站为辅基站和所述第二基站为主基站。
本发明另一方面也提供了一种终端,其一种可能的实现方式包括: 第一无线链路 控制 RLC实体, 用于接收分组数据单元 PDU和确定所述 PDU达到最大重传次数; 第二 RLC实体, 用于当所述第一 RLC实体确定所述 PDU达到最大重传次数时, 根 据所述第一 RLC实体的指示重传所述 PDU; 其中, 所述第一 RLC实体对应第一基 站, 所述第二 RLC实体对应第二基站。
在一种可能的实现方式中, 该终端还包括: 公共分组数据汇聚协议 PDCP实体, 分别连接所述第一 RLC实体和所述第二 RLC实体,用于向所述第一 RLC实体发送所 述 PDU数据。
在另一种可能的实现方式中, 该终端还包括: 第一 PDCP实体, 分别连接所述第 一 RLC实体和所述第二 RLC实体, 用于向所述第一 RLC实体发送所述 PDU。 结合第一种可能的实现方式, 所述第一 RLC实体, 具体用于向所述公共 PDCP 实体发送重传指示, 所述重传指示包含 PDU信息; 所述重传指示用以指示所述第二 RLC实体重传所述 PDU。
结合第二种可能的实现方式, 所述第一 RLC实体, 具体用于向所述第一 PDCP 实体发送重传指示, 所述重传指示包含 PDU信息; 所述重传指示用以指示所述第二 RLC实体重传所述 PDU。
在一种可能的实现方式中,所述 PDU信息为以下至少一种:所述 PDU的数据包; 所述 PDU的序列号。
在一种可能的实现方式中,所述第一基站为主基站和所述第二基站为辅基站;或, 所述第一基站为辅基站和所述第二基站为主基站。
可以看出, 采用本发明实施例的方法和终端, 当检测所述 PDU达到最大重传次 数时, 并不由辅基站发起 RRC连接重建立过程, 而是通知主机站侧的 RLC实体重传 所述达到最大重传次数的 PDU, 从而降低了 UE进行 RRC连接重建立的频率, 进一 步避免了频繁重建立引起的数据丢包, 进而提高了用户体验。 附图说明 为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例中所 需要使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发明的一些 实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还可以根据 这些附图获得其他的附图。
图 1是本发明实施例实现基站间载波聚合数据重传的通讯方法流程示意图; 图 2是本发明实施例实现基站间载波聚合数据重传的另一通讯方法流程示意图; 图 3是本发明实施例实现基站间载波聚合数据重传的又一通讯方法流程示意图; 图 4是本发明实施例实现基站间载波聚合数据重传的终端结构示意图。 具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完 整的描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。 基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的 所有其他实施例, 都属于本发明保护的范围。
终端, 指向用户提供语音和 /或数据连通性的设备, 包括无线终端或有线终端。无 线终端可以是具有无线连接功能的手持式设备、或连接到无线调制解调器的其他处理 设备, 经无线接入网与一个或多个核心网进行通信的移动终端。例如, 无线终端可以 是移动电话 (或称为"蜂窝"电话)和具有移动终端的计算机。 又如, 无线终端也可以 是便携式、 袖珍式、 手持式、 计算机内置的或者车载的移动装置。 再如, 无线终端可 以为移动站 (英文为: mobile station )、 接入点 (英文为: access point)、 或用户装备 (英文为: user equipment, 简称 UE) 等。 基站,可以是指接入网中在空中接口上通过一个或多个小区与无线终端通信的设 备。 例如, 基站可以是 GSM或 CDMA中的基站 (英文为: base transceiver station, 简称 BTS), 也可以是 WCDMA中的基站 (英文为: NodeB), 还可以是 LTE中的演 进型基站 (英文为: evolutional Node B, 简称 e B或 e-NodeB), 或者是后续演进网 络中的基站, 本发明对此并不做限定。
本发明一实施例提供了一种通讯方法, 如图 1所示, 该方法包括:
步骤 110: 终端的第一 RLC实体接收 PDU (Packet Data Unit, 分组数据单元)。 具体的,在本实施例中所述终端的第一 RLC实体可以接收该第一 RLC实体的上 一层实体发送的 PDU数据, 以下以终端中对应辅基站的 RLC实体作为终端的第一 RLC实体、以终端中对应主基站的 RLC实体作为终端的第二 RLC实体为例进行具体 说明, 但并不局限于此。
1 )、 当该终端协议栈内部具有公共 RRC 实体与公共 PDCP(Packet Data Convergence Protocol, 分组数据汇聚协议)实体时, 在基站间载波聚合的场景下, 终 端内部存在分别对应主基站与辅基站的两个 RLC协议实体; 当有上行数据发送时, 通过公共的 PDCP实体将数据无线承载上的数据包分流到对应主基站的 RLC实体和 对应辅基站的 RLC实体; 因此, 本实施例中对应辅基站的 RLC实体可以接收公共 PDCP实体发送的 PDU数据, 并且该 PDU数据可以是所述公共 PDCP实体将上层数 据进行头压缩、编号以及加密后发送的, 具体的头压缩、编号或加密操作可以采用现 有方式进行, 本实施例在此不再赘述。
2)、 当终端协议栈内部具有公共 RRC实体, 但不具有公共 PDCP实体时, 在基 站间载波聚合的场景下, 终端内部存在分别对应主基站与辅基站的两个 RLC实体, 及分别对应主基站与辅基站的两个 PDCP实体; 当有上行数据发送时, 该终端协议栈 内部对应主基站的 PDCP实体将上层数据进行头压缩、编号以及加密后交给对应主基 站的 RLC实体, 再由对应主基站的 RLC实体将数据无线承载上的 PDU数据包分流 到对应主基站的 MAC 实体和对应辅基站的 PDCP 实体上去, 而此时对应辅基站的 PDCP实体将从对应主基站 RLC实体接收的 RLC PDU透传给对应辅基站的 RLC实 体; 因此, 本实施例中对应辅基站的 RLC实体可以接收对应辅基站的 PDCP实体发 送的 PDU数据, 并针对该 PDU添加报头后再向对应辅基站的 MAC实体进行传输; 其中, 具体的头压缩、编号或加密操作可以采用现有方式进行, 本实施例在此不再赘 述。
步骤 120: 当所述第一 RLC实体确定所述 PDU达到最大重传次数时, 所述第一 RLC实体指示所述终端的第二 RLC实体传输所述 PDU; 其中, 所述第一 RLC实体 对应第一基站, 所述第二 RLC实体对应第二基站。
值得注意的是, 当对应辅基站的 RLC实体检测到 RLC PDU达到最大重传次数, 即 RLC实体重传次数达到最大值后, 终端会判定发生了无线链路失败; 但在本实施 例中此时并不由辅基站发起 RRC连接重建立过程,而是通知对应主基站的 RLC实体 重传所述达到最大重传次数的 PDU, 从而降低了终端进行 RRC连接重建立的频率, 进一步避免了频繁重建立引起的数据丢包, 进而提高了用户体验。
具体的, 针对对应辅基站的 RLC实体可以接收不同上层实体发送的 PDU数据, 本实施例也可以通过多种方式通知对应主基站的 RLC实体重传所述达到最大重传次 数的 PDU, 具体如下所述, 但并不局限于此:
A、 当对应辅基站的 RLC实体检测到某个 RLC PDU达到最大重传次数后, 先通 知公共的 PDCP实体进行数据包的重传;具体的,对应辅基站的 RLC实体向公共 PDCP 实体发送一个重传指示, 通知公共 PDCP实体该对应辅基站的 RLC实体上有 RLC PDU达到最大重传次数, 所述重传指示中包含了到达最大重传次数的 PDU信息, 再 由所述公共 PDCP实体根据所述指示向主机站的 RLC实体重新发送所述 PDU, 该对 应主基站的 RLC实体根据预先分配的 SN重传该 PDU。 需要说明的是, 在本实施例 中对应辅基站的 RLC实体向所述公共 PDCP实体回传的 PDU信息应至少包括所述 PDU的数据包或数据包号。
B、 当对应辅基站的 RLC实体检测到某个 RLC PDU达到最大重传次数后, 通过 对应辅基站的 PDCP实体向对应主基站的 RLC实体发送重传指示, 所述重传指示中 包含了到达最大重传次数的 PDU的信息,该对应主基站的 RLC实体在收到对应辅基 站的 PDCP实体回传回来的重传指示之后,根据预先分配的 SN重传该 PDU。 同样需 要说明的是, 本实施例中对应辅基站的 PDCP实体向对应主基站的 RLC实体发送的 重传指示中包含的 PDU信息应至少包括所述 PDU的数据包或数据包号,此处不再赘 述。 可选的, 所述第一基站为主基站和所述第二基站为辅基站; 或, 所述第一基站为 辅基站和所述第二基站为主基站
下面以具体的数据重传过程为例对上述实施例中实现基站间载波聚合的数据重 传通讯方法进行详细描述; 如图 2所示, 当终端的公共 PDCP实体负责数据包的分流 时, 该方法包括:
S210: 公共 PDCP实体将上层数据进行头压缩、编号以及加密后交给对应辅基站 的 RLC实体;
S220:对应辅基站的 RLC实体向对应辅基站的 MAC实体发送 RLC PDU的同时, 检测所述 PDU是否达到最大重传次数, 如果是, 则执行步骤 S230;
S230: 对应辅基站的 RLC 实体将达到最大重传次数的 PDU信息回传给公共
PDCP实体;
S240: 所述公共 PDCP实体根据对应辅基站的 RLC实体回传的信息, 向对应主 基站的 RLC实体重新发送对应的 PDU数据包;
S250: 对应主基站的 RLC实体向对应主基站的 MAC实体发送该 RLC PDU, 完 成数据重传。
下面以另一具体的数据重传过程为例对上述实施例中实现基站间载波聚合的数 据重传通讯方法进行详细描述; 如图 3所示, 当终端的对应主基站的 RLC实体负责 数据包的分流时, 该方法包括:
S310:对应主基站的 PDCP实体将上层数据进行头压缩、编号以及加密后交给对 应主基站的 RLC实体;
S320: 对应主基站的 RLC实体生成 RLC PDU后发送给对应辅基站的 PDCP实 体;
S330:对应辅基站的 PDCP实体将接收到的 RLC PDU透传给对应辅基站的 RLC 实体;
S340: 对应辅基站的 RLC实体重新添加自身的 RLC包头后, 向对应辅基站的
MAC实体传输 RLC PDU;
S350: 当对应辅基站的 RLC实体发现某个 RLC PDU达到最大重传次数后, 通 知对应辅基站的 PDCP实体;
S360: 对应辅基站的 PDCP实体通知对应主基站的 RLC实体执行 PDU的重传; S370: 对应主基站的 RLC实体向对应主基站的 MAC实体发送所述 PDU, 完成 数据重传。 值得注意的是, 在本实施例中与终端 RLC进行信息交互的主基站和辅基站可以 互换, 即主基站在该实现方式中可以执行辅基站的动作、辅基站在该实现方式中也可 以执行主基站的动作, 本实施例在此不再赘述。
可以看出, 在现有的实现方案中当终端发现 RLC实体重传次数达到最大值后, 终端会判定发生了无线链路失败, 此时终端会发起 RRC连接重建立过程。 然而, 由 于基站内部小区聚合方式中终端聚合的服务小区都属于同一个基站且只受一个基站 控制,因此当发生无线链路失败进而由终端发起 RRC连接重建立过程是比较合理的; 但在基站间载波聚合场景下, 当终端通过辅基站 RLC发送的数据达到最大重传次数 时, 倘若此时判定发生无线链路失败而由终端发起 RRC连接重建立势必会造成数据 包的丢失, 而采用本发明实施例的方法, 当检测所述 PDU达到最大重传次数时, 并 不由辅基站发起 RRC连接重建立过程,而是通知主机站侧的 RLC实体重传所述达到 最大重传次数的 PDU, 从而降低了终端进行 RRC连接重建立的频率, 进一步避免了 频繁重建立引起的数据丢包, 进而提高了用户体验。
基于上述相同思想,本发明另一实施例也提出了一种实现基站间载波聚合的数据 重传终端, 如图 4所示, 该终端 400包括: 第一 RLC实体 410和第二 RLC实体 420; 其中,
所述第一 RLC实体 410用于接收接收分组数据单元 PDU和确定所述 PDU达到 最大重传次数; 所述第二 RLC实体 420用于当所述第一 RLC实体确定所述 PDU达 到最大重传次数时, 根据所述第一 RLC实体的指示重传所述 PDU; 其中, 所述第一 RLC实体对应第一基站, 所述第二 RLC实体对应第二基站。
其中, 该终端 400还可包括(图中未示出): 公共分组数据汇聚协议 PDCP实体, 分别连接所述第一 RLC实体和所述第二 RLC实体, 用于向所述第一 RLC实体发送 所述 PDU数据。
此外,, 该终端 400还可包括(图中未示出): 第一 PDCP实体, 分别连接所述第 一 RLC实体和所述第二 RLC实体, 用于向所述第一 RLC实体发送所述 PDU。
需要说明的是, 所述第一 RLC实体, 具体用于向所述公共 PDCP实体发送重传 指示, 所述重传指示包含 PDU信息; 所述重传指示用以指示所述第二 RLC实体重传 所述 PDU。
除此之外, 本实施例中所述第一 RLC实体, 具体用于向所述第一 PDCP实体发 送重传指示, 所述重传指示包含 PDU信息; 所述重传指示用以指示所述第二 RLC实 体重传所述 PDU。 其中,所述 PDU信息应至少包括:所述 PDU的数据包和 /或所述 PDU的序列号。 值得注意的是, 在本实施例中所述第一基站为主基站和所述第二基站为辅基站; 或, 所述第一基站为辅基站和所述第二基站为主基站。
需要注意的是,本领域技术人员很容易了解, 上述实施例中所描述的各种实现基 站间载波聚合的数据重传的终端也可以作为其他通信设备的一部分存在,并在各种通 信设备中实现数据重传方面与上述实施例中的描述一致,因而包含上述实施例中实现 基站间载波聚合的数据重传终端的通信设备也应包含在本申请的保护范围之内,在此 不再赘述。
专业人员还可以进一步应能意识到,结合本文中所公开的实施例描述的各示例的 单元及算法步骤, 能够以电子硬件、 计算机软件或者二者的结合来实现, 为了清楚地 说明硬件和软件的可互换性,在上述说明中已经按照功能一般性地描述了各示例的组 成及步骤。这些功能究竟以硬件还是软件方式来执行,取决于技术方案的特定应用和 设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的 功能, 但是这种实现不应认为超出本发明实施例的范围。
结合本文中所公开的实施例描述的方法或算法的步骤可以直接用硬件、处理器执 行的软件模块, 或者二者的结合来实施。
对所公开的实施例的上述说明,使本领域专业技术人员能够实现或使用本发明实 施例。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的,本文 中所定义的一般原理可以在不脱离本发明实施例的精神或范围的情况下,在其它实施 例中实现。 因此, 本发明实施例将不会被限制于本文所示的这些实施例, 而是要符合 与本文所公开的原理和新颖特点相一致的最宽的范围。
以上所述仅为本发明实施例的较佳实施例而已, 并不用以限制本发明实施例, 凡 在本发明实施例的精神和原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含 在本发明实施例的保护范围之内。

Claims

权 利 要 求
1、 一种通讯方法, 其特征在于, 包括:
终端的第一无线链路控制 RLC实体接收分组数据单元 PDU;
当所述第一 RLC实体确定所述 PDU达到最大重传次数时, 所述第一 RLC 实体指示所述终端的第二 RLC实体传输所述 PDU;
其中,所述第一 RLC实体对应第一基站,所述第二 RLC实体对应第二基站。
2、 根据权利要求 1所述的方法, 其特征在于, 所述终端的第一无线链路控 制实体 RLC接收分组数据单元 PDU, 具体包括:
所述第一 RLC实体接收所述终端的公共分组数据汇聚协议 PDCP实体发送 的所述 PDU数据。
3、 根据权利要求 1所述的方法, 其特征在于, 所述终端的第一无线链路控 制实体 RLC接收分组数据单元 PDU, 具体包括:
所述第一 RLC实体接收所述终端的第一 PDCP实体发送的所述 PDU。
4、 根据权利要求 2所述的方法, 其特征在于, 所述第一 RLC实体指示所述 终端的第二 RLC实体传输所述 PDU, 具体包括:
所述第一 RLC实体向所述公共 PDCP实体发送重传指示, 所述重传指示包 含 PDU信息;
所述重传指示用以指示所述第二 RLC实体传输所述 PDU。
5、 根据权利要求 3所述的方法, 其特征在于, 所述第一 RLC实体指示所述 终端的第二 RLC实体传输所述 PDU, 具体包括:
所述第一 RLC实体向所述第一 PDCP实体发送重传指示, 所述重传指示包 含 PDU信息;
所述重传指示用以指示所述第二 RLC实体传输所述 PDU。
6、 根据权利要求 4或 5所述的方法, 其特征在于:
所述 PDU信息为以下至少一种:
所述 PDU的数据包;
所述 PDU的序列号。
7、 根据权利要求 1至 5任一项所述的方法, 其特征在于:
所述第一基站为主基站和所述第二基站为辅基站; 或,
所述第一基站为辅基站和所述第二基站为主基站。
8、 一种终端, 其特征在于, 包括: 第一无线链路控制 RLC实体,用于接收分组数据单元 PDU和确定所述 PDU 达到最大重传次数;
第二 RLC实体, 用于当所述第一 RLC实体确定所述 PDU达到最大重传次 数时, 根据所述第一 RLC实体的指示重传所述 PDU;
其中,所述第一 RLC实体对应第一基站,所述第二 RLC实体对应第二基站。
9、 根据权利要求 8所述的终端, 其特征在于, 还包括:
公共分组数据汇聚协议 PDCP实体, 分别连接所述第一 RLC实体和所述第 二 RLC实体,用于向所述第一 RLC实体发送所述 PDU数据。
10、 根据权利要求 8所述的终端, 其特征在于, 还包括:
第一 PDCP实体, 分别连接所述第一 RLC实体和所述第二 RLC实体, 用于 向所述第一 RLC实体发送所述 PDU。
11、 根据权利要求 9所述的终端, 其特征在于:
所述第一 RLC实体, 具体用于向所述公共 PDCP实体发送重传指示, 所述 重传指示包含 PDU信息;
所述重传指示用以指示所述第二 RLC实体重传所述 PDU。
12、 根据权利要求 10所述的终端, 其特征在于:
所述第一 RLC实体, 具体用于向所述第一 PDCP实体发送重传指示, 所述 重传指示包含 PDU信息;
所述重传指示用以指示所述第二 RLC实体重传所述 PDU。
13、 根据权利要求 11或 12所述的终端, 其特征在于:
所述 PDU信息为以下至少一种:
所述 PDU的数据包;
所述 PDU的序列号。
14、 根据权利要求 8至 13任一项所述的终端, 其特征在于:
所述第一基站为主基站和所述第二基站为辅基站; 或,
所述第一基站为辅基站和所述第二基站为主基站。
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