WO2011113202A1 - 上行链路传输方法、基站和中继节点 - Google Patents

上行链路传输方法、基站和中继节点 Download PDF

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Publication number
WO2011113202A1
WO2011113202A1 PCT/CN2010/071126 CN2010071126W WO2011113202A1 WO 2011113202 A1 WO2011113202 A1 WO 2011113202A1 CN 2010071126 W CN2010071126 W CN 2010071126W WO 2011113202 A1 WO2011113202 A1 WO 2011113202A1
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WO
WIPO (PCT)
Prior art keywords
uplink
uplink transmission
relay node
transmission method
base station
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PCT/CN2010/071126
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English (en)
French (fr)
Inventor
韩锋
郑武
冷晓冰
张凯宾
刘继民
Original Assignee
上海贝尔股份有限公司
阿尔卡特朗讯
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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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 JP2012557369A priority Critical patent/JP5674829B2/ja
Priority to KR1020147023303A priority patent/KR20140111349A/ko
Priority to EP10847671.4A priority patent/EP2549708A4/en
Priority to CN201080061741.0A priority patent/CN102714650B/zh
Priority to PCT/CN2010/071126 priority patent/WO2011113202A1/zh
Priority to US13/635,033 priority patent/US20130003650A1/en
Priority to KR1020127026842A priority patent/KR20130005290A/ko
Priority to TW100107344A priority patent/TW201218709A/zh
Publication of WO2011113202A1 publication Critical patent/WO2011113202A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/16Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18Negotiating wireless communication parameters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/14Relay systems
    • H04B7/15Active relay systems
    • H04B7/155Ground-based stations
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/042Public Land Mobile systems, e.g. cellular systems
    • H04W84/047Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Definitions

  • the present invention relates to an uplink transmission method and apparatus, and more particularly to a multi-hop system, particularly an uplink transmission method in a next generation mobile communication system, and a base station and a relay node performing the uplink transmission method .
  • Background technique
  • Relay technology is considered as a good candidate for improving cell capacity and extending coverage areas to meet the requirements of next-generation mobile communication systems.
  • L'1'EA Long Term Evolut i on Advance
  • Type I relay should have its own physical cell II), and Similar to an independent base station (eNB), it is visible to the user equipment.
  • FIG. 1 shows a schematic diagram of basic nodes and interfaces in a system in which a Type I relay is deployed, where Uu (user user) represents an interface between a user equipment and a relay node, and Un (user-network) represents a relay. An interface between a node and a base station eNB. It should be noted that only the two-hop system is taken as an example here. It will be apparent to those skilled in the art that the expansion to a multi-hop system will be apparent to those skilled in the art.
  • an uplink (UL) in-band resource partition between the backhaul link of the Type 1 relay and the access link has been achieved, which specifies: Relaying in a single frequency band
  • the link from the node to the base station and the link from the user equipment to the relay node are time division multiplexed, that is, only one link is valid at any time.
  • the Scheduling Request (SR) procedure is a process for requesting uplink (ie, a link from a user equipment to a relay node) resources.
  • the Buffer Status Report (BSR) procedure is a process for reporting the amount of data in the uplink buffer of the user equipment to the relay node. If the existing and BSR processes are reused on the Un interface [Reference 2], the delay becomes unbearable from the perspective of the user equipment. Accepted.
  • the object of the present invention is to provide a dynamic scheduling scheme for an uplink transmission method, in which a base station can dynamically configure an uplink transmission method of a relay node according to a situation, thereby realizing reduction of uplink transmission delay and improving resource efficiency. .
  • an uplink transmission method comprising: selecting an uplink transmission in a set of candidate uplink transmission methods according to an uplink traffic statistics parameter of a relay node Method: notifying the relay node of the selected uplink transmission method; and the relay node performing the uplink transmission according to the selected uplink transmission method.
  • the candidate uplink transmission method set includes at least one of the following methods: a scheduling request based transmission method; a pre-allocated resource transmission method; and a contention based transmission method.
  • the relay node performs uplink transmission on the pre-allocated resources.
  • the relay node performs uplink transmission on the pre-allocated competing resources h based on the contention mechanism.
  • the relay node sends an uplink scheduling request to the base station when receiving the uplink data or the uplink scheduling request of the user equipment, to Requesting to allocate uplink resources; and the relay node transmitting uplink data on the allocated uplink resources.
  • the method further includes: the relay node generating a buffer status report message based on the amount of data in the buffer, and generating the buffer A status report message is sent to the base station.
  • the method further comprises: the relay node receiving the buffer status from the user equipment The report message ⁇ , according to the amount of data in the buffer and the received buffer status report message, generates a buffer status report message to be sent to the base station, and sends the generated buffer status report message to the base station.
  • a base station including: a transmission method selection smear for selecting an uplink in a set of candidate uplink transmission methods according to an uplink service statistic parameter of a relay node And a selection result notification unit, configured to notify the relay node of the selected uplink transmission method.
  • a relay node comprising: a receiving unit, configured to receive a message indicating an uplink transmission method; and an uplink transmission unit, configured to perform uplink according to the received message Link transmission method for uplink transmission.
  • FIG. 1 shows a schematic diagram of basic nodes and interfaces in a system in which a Type I relay is deployed;
  • FIG. 2 shows a schematic diagram of an uplink transmission method according to a first embodiment of the present invention;
  • FIG. 3 shows according to the present invention.
  • FIG. 4 is a schematic diagram showing an uplink transmission method according to a third embodiment of the present invention;
  • FIG. 5 is a diagram showing implementation of an uplink according to a fifth embodiment of the present invention.
  • relay is used as an enhancement technique for implementing traffic/signaling forwarding between base stations and user equipment for better coverage and throughput.
  • an intuitive method of the uplink transmission method on the Un interface is to reuse the SR and BSR procedures of the existing Uu interface.
  • FIG. 2 shows a schematic diagram of an uplink transmission method according to a first embodiment of the present invention.
  • the existing SR and BSR procedures are employed on the Un interface (hereinafter, the uplink transmission method is referred to as a sequential SR and a sequential BSR transmission method).
  • step S201 the user equipment triggers the SR procedure to send a scheduling request to the relay node.
  • step S202 the relay node feeds back an uplink scheduling grant message to the user equipment.
  • the user equipment sends a BSR message to the relay node in step S203.
  • step S204 the relay node allocates an uplink resource according to the BSR message received from the user equipment, and feeds back an uplink scheduling grant message to the user equipment.
  • the user equipment receiving the uplink scheduling grant message transmits uplink data to the relay node at step S205. This is the SR and BSR process on the existing Uu interface.
  • the relay node When the relay node receives uplink data to be transmitted to the base station from the user equipment, and the priority of the logical channel to which the data belongs is higher than other available data, or in the case where no other data is to be transmitted, the relay The node will trigger a regular BSR process. Once the regular BSR is triggered and the relay node has no uplink resources, the SR procedure is triggered to request uplink resources.
  • step S206 the relay node sends a scheduling request to the base station.
  • step S207 the base station feeds back an uplink scheduling grant message to the relay node.
  • the relay node sends a BSR message to the base station in step S208.
  • step S209 the base station allocates an uplink resource according to the BSR message received from the relay node, and feeds back an uplink scheduling grant message to the relay node.
  • the relay node that received the uplink scheduling grant message transmits uplink data to the base station at step S210.
  • uplink data from the user equipment to the base station is delayed because it first needs to request uplink resources on the Un interface.
  • the delay may increase further.
  • the delay caused by the uplink transmission method according to the first embodiment of the present invention comes from a plurality of aspects.
  • the SR process is triggered only when the uplink data of the user equipment actually arrives at the relay node.
  • the BSR message sent to the base station only indicates the amount of data in the uplink buffer of the relay node at the time, and after the relay node sends the BSR message to the base station, the relay node sends the uplink data to the base station. Between, it is possible that new user equipment uplink data arrives at the relay node.
  • the relay node always requests uplink resources through the SR and BSR procedures, and in fact, according to the load status of the current relay node, some adaptation mechanisms can be used.
  • FIG. 3 shows a schematic diagram of an uplink transmission method according to a second embodiment of the present invention.
  • the uplink transmission method according to the second embodiment of the present invention is different from the uplink transmission method according to the first embodiment in the triggering time of the SR process and the BSR process of the relay node.
  • the relay node when the relay node receives a scheduling request from the user equipment it serves, the relay node will immediately trigger the SR procedure when there is no available uplink resource. .
  • the SR period arrives, a scheduling request is sent to the base station to request an uplink resource.
  • the relay node when the relay node receives the BSR message from the user equipment it serves, the relay node will generate a BSR message and immediately trigger the BSR to the base station. process.
  • the user equipment triggers the SR procedure in step S301 to send a scheduling request to the relay node.
  • the relay node that received the scheduling request will trigger the SR procedure in step S302 to send a scheduling request to the base station.
  • the relay node feeds back an uplink scheduling grant message to the user equipment.
  • the base station feeds back an uplink scheduling grant message to the relay node.
  • the user equipment sends a BSR message to the relay node.
  • step S206 S210 according to the first embodiment of the present invention may be employed.
  • the relay node in order to further reduce the delay, when the relay node receives the BSR message from the user equipment it serves, the relay node will immediately trigger the BSR procedure to the base station. Send a BSR message.
  • the relay node generates a BSR message to be transmitted to the base station.
  • the relay node considers not only the amount of data in its uplink buffer, but also the amount of data that the user equipment will send.
  • the relay node triggers a regular BSR procedure to transmit the generated BSR message to the base station.
  • the user equipment will receive an uplink scheduling grant message from the relay node at step S308 and transmit uplink data to the relay node at step S3I0.
  • the relay node After receiving the uplink scheduling grant message from the base station, the relay node will transmit uplink data to the base station at step S31 1 .
  • the SR and BSR procedures at the user equipment and the SR and BSR procedures of the relay node are sequentially performed, in the uplink according to the second embodiment of the present invention.
  • the SR process and the BSR process at the user equipment are interleaved with the SR process and the I3SR process of the relay node (that is, the enhanced SR transmission method and the enhanced BSR transmission method are simultaneously adopted).
  • the uplink transmission method according to the second embodiment of the present invention when the relay node receives the uplink data of the user equipment, the uplink data can be quickly transmitted to the base station without waiting for a long time. SR process and BSR process.
  • FIG. 3 shows an example of an uplink transmission method according to a second embodiment of the present invention.
  • the uplink transmission method according to the second embodiment of the present invention does not have to satisfy the above-described step sequence of S301 S31 1.
  • S302 can even be triggered after S303 or S305, and S307 may also trigger after S308. This can be configured by the relay node.
  • FIG. 4 shows a schematic diagram of an uplink transmission method according to a third embodiment of the present invention.
  • the uplink transmission method according to the third embodiment of the present invention is different from the uplink transmission method according to the second embodiment of the present invention in that the SR and BSR procedures of the relay node are omitted.
  • the relay node requests the uplink resource differently by the SR procedure and the BSR procedure, in the uplink transmission method according to the third embodiment of the present invention
  • the base station allocates uplink resources to the relay node by using a pre-allocation mechanism.
  • the relay node transmits uplink data to the base station with the allocated resources.
  • the uplink transmission method according to the third embodiment of the present invention is hereinafter referred to as a pre-allocation resource transmission method
  • steps S401, S402, S404, S405, S406, S407, S408 of the uplink transmission method according to the third embodiment of the present invention are respectively associated with the uplink transmission method according to the second embodiment of the present invention.
  • Steps S301, S303, S305, S306, S308, S310, and S31 1 are the same.
  • step S302, S304 and S309 In place of the SR process and the BSR process of the relay node, ie, steps S302, S304 and S309, in the step
  • the base station allocates uplink resources to the relay node by using a pre-allocation mechanism. That is, for unused uplink resources, the base station transmits an uplink scheduling grant message to the relay node to inform it of the available uplink scheduling resources.
  • the relay node can transmit uplink data by using the pre-allocated uplink resources without transmitting the scheduling request SR and BSR messages in advance.
  • the relay node when the relay node has no data to transmit, the relay node will respond with a paddling BSR message, which will increase uplink interference and reduce resource usage. Therefore, the pre-allocated resource transmission method can be employed in the case where the relay node is in a high traffic load.
  • the relay node may also generate a BSR message and trigger the BSR process.
  • a BSR message is sent to the base station on the allocated resources to request an uplink resource.
  • the BSR message generated by the relay node may also take into account the amount of data that the user equipment is about to send to the relay node. At this time, the above enhanced BSR method can be employed.
  • the uplink transmission method according to the third embodiment of the present invention omits the SR process (or even the BSR process may be omitted), reducing system delay.
  • the uplink transmission method according to the fourth embodiment of the present invention is different from the uplink transmission method according to the third embodiment of the present invention in the manner of acquiring uplink resources.
  • the base station notifies the plurality of relay nodes of unused uplink resources.
  • the relay node uses a contention-based uplink transmission method to directly transmit uplink data on unused resources.
  • the uplink transmission method according to the fourth embodiment of the present invention will hereinafter be referred to as a contention-based transmission method.
  • This does not require an SR procedure on the Un interface, so that delay and signaling credit can be further reduced.
  • the relay node in the uplink transmission method according to the fourth embodiment of the present invention, can also trigger the BSR process when needed, on the allocated resources.
  • a BSR message is sent to the base station to request an uplink resource.
  • the above enhanced BSR method can also be employed.
  • the uplink transmission method according to the fourth embodiment of the present invention is limited to the case of low traffic load, and in the case of low traffic load, the relay node generates only a limited amount of traffic.
  • a contention-based uplink transmission method can be used once the high priority and delay-critical traffic arrives at the relay node and the relay node has no uplink resources.
  • the uplink transmission method according to the first to fourth embodiments of the present invention is merely an example of an uplink transmission method that can be employed in a system in which a relay node is deployed. Other methods in other operating environments can also be devised.
  • the base station can dynamically select different uplink transmission methods according to the uplink traffic statistics parameters of the relay node to achieve good delay performance and high resource utilization.
  • the uplink service statistics parameter of the relay node may be a size, a priority, and the like of the traffic volume.
  • the station can be configured as follows: In the case where the relay node is in a relatively heavy load, the pre-allocated resource transmission method is used; in the case where the load of the relay node is relatively light, the enhanced SR transmission method and/or the enhanced BSR transmission method are used;
  • Fig. 5 shows a system configuration diagram for implementing an uplink transmission method according to a fifth embodiment of the present invention.
  • the base station 10 includes a transmission method selection unit 101, a scheduling unit 102, and a selection result notification unit 103. Accordingly, the relay node 20 includes a selection result receiving unit 201 and an uplink transmission unit 202.
  • the transmission method selection unit 101 selects an appropriate uplink transmission method based on the uplink traffic statistical parameters of the relay node.
  • the set of candidate uplink transmission methods may be configured/stored in advance for the base station according to the situation.
  • the transmission method selection unit 101 selects an uplink transmission method among the candidate uplink transmission method sets.
  • the transmission method selection unit 101 notifies the scheduling unit 102 and the selection result notification unit 103 of the selection result.
  • the selection result notifying unit 103 transmits the selection of the base station to the selection result receiving unit 201 of the relay node 20. For example, a flag can be set in the identification field of the uplink scheduling grant message to inform the relay node of the selection result.
  • uplink data transmission is performed in accordance with the selected uplink transmission method.
  • the uplink transmission unit 202 can perform uplink data transmission in accordance with the above-described first to fourth embodiments.
  • the relay node 20 also includes a buffer (not shown) for buffering h-line data.
  • the selected uplink transmission method is the uplink transmission method according to the second embodiment
  • the uplink transmission unit 202 generates a transmission according to the amount of data in the buffer and the BSR message received from the user equipment.
  • the BSR message to the base station is sent to the base station.
  • the transmission method selection unit 101 can continuously monitor the uplink traffic statistics parameters of the relay node and reselect the uplink transmission method as needed.
  • some embodiments also include a machine readable or computer readable program storage device (eg, a digital data storage medium) and encoding machine executable or computer executable program instructions, wherein the instructions perform some of the above methods or All steps.
  • the program storage device can be a digital memory, a magnetic storage medium (such as a magnetic disk and magnetic tape), a hardware or an optically readable digital data storage medium.
  • Embodiments also include a programming computer that performs the steps of the above method.

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Description

上行链路传输方法、 基站和中继节点 技术领域
本发明涉及上行链路传输方法和设备, 更具体地, 涉及多跳系统, 尤其是 下 ·代移动通信系统中的上行链路传输方法、 以及执行该上行链路传输方法的基 站和中继节点。 背景技术
近年来, 对中继技术的研究逐渐引起人们的关注。 中继技术被当作提高小区 容量和扩展覆盖区域以满足下一代移动通信系统要求的一种很好的候选技术。在 下一代移动通信系统如 L'1'E A (Long Term Evolut i on Advance, 长期演进项目) 标准化进程中, 己经就以下规定达成一致: 类型 I中继应该具有自身的物理小区 II), 并且类似于独立的基站 (eNB ), 对于用户设备是可见的。
图 1示出了部署有类型 I中继的系统中的基本节点和接口的示意图, 其中, Uu ( user user ) 表示用户设备与中继节点之间的接口, Un ( user-network ) 表 示中继节点与基站 eNB之间的接口。需要注意,这里仅以两跳系统为例进行说明。 显然, 扩展到多跳系统的情况对于本领域技术人员而言是显而易见的。
在参考文献 [ 1 ]中, 已经就类型 1 中继的回程链路和接入链路之间的上行链 路 (UL) 带内资源划分达成- 致, 其中规定: 在单个频带内对中继节点到基站的 链路和用户设备到中继节点的链路进行时分复用, 即任何时刻仅有一个链路有 效。
L¾此, 由于上行链路数据的传输要经过中继节点, 并且采用带内资源划分, 所以将用户设备的数据传输到基站所经历的延迟会增加。 此外, 在考虑 Un上行 链路调度授予 ( Upl ink Schedul ing Grant ) 的子帧间隔的情况下, 延迟会进-一 歩增加。 在 UU 接口上, 如果用户设备未被分配有足够的资源以发送缓存状态报 ί'? BSR, 则将开关键控调度请求 SR发送给中继节点。 调度请求 (SR, Schedu l ing Request ) 过程是用亍请求上行链路 (即从用户设备到中继节点的链路) 资源的 过程。 缓存器状态报告 (BSR, Buffer Status Report ) 过程是用于向中继节点 报告用户设备的上行链路缓存器中的数据量的过程。 如果在 Un接口上重新利用 现有的 和 BSR过程 [参考文献 2], 则从用户设备角度看, 延迟变得不能忍 受。
因此, 需要开发并设计一种 Un接口上的新技术。
参考文献:
[ 1 ] . TR 36. 814, " Further advancements for E UTRA phys ical layer aspects " .
[2] . 3GPP TS 36. 321 , v8. 1. 0 (2008-03), 3GPP Techni cal Specif icat i on Group Radi o Access Network E UTRA MAC protocol spec ifi ca ion (Rel ease 8) 发明内容
本发明的目的在于提出了一种上行链路传输方法的动态调度方案, 其中基站 可根据情况动态地配置中继节点的上行链路传输方法, 从而实现上行链路传输延 迟的降低并提高资源效率。
根据本发明的第一方面, 提出了一种上行链路传输方法, 包括歩骤: 根据中 继节点的上行链路业务统计参数, 在候选上行链路传输方法集合中选择一种上行 链路传输方法; 向中继节点通知所选上行链路传输方法; 以及中继节点按照所选 上行链路传输方法, 进行上行链路传输。
优选地, 所述候选上行链路传输方法集合包括以下方法中的至少一种: 基 于调度请求的传输方法; 预分配资源传输方法; 以及基于竞争的传输方法。
优选地, 如果所选上行链路传输方法是预分配资源传输方法, 则中继节点 在预分配的资源上进行上行链路传输。
优选地, 如果所选上行链路传输方法是基于竞争的传输方法, 则中继节点 基于竞争机制, 在预分配的竞争资源 h进行上行链路传输。
优选地, 如果所选上行链路传输方法是基于调度请求的方法, 则中继节点 在接收到用户设备的上行链路数据或上行链路调度请求时, 向基站发送上行链路 调度请求, 以请求分配上行链路资源; 以及中继节点在分配的上行链路资源上传 输上行链路数据。
优选地, 在中继节点向基站发送上行链路调度请求的步骤之后, 所述方法 进一歩包括: 中继节点基于缓存器中的数据量, 产生缓存器状态报告消息, 并将 产生的缓存器状态报告消息发送到基站。
优选地, 所述方法迸一步包括: 中继节点在从用户设备接收到缓存器状态 报告消息吋, 根据缓存器中的数据量和接收到的缓存器状态报告消息, 产生要发 送到基站的缓存器状态报告消息, 并将产生的缓存器状态报告消息发送到基站。
根据本发明的第二方面, 提出了一种基站, 包括: 传输方法选择卑元, 用于 根据中继节点的上行链路业务统计参数, 在候选上行链路传输方法集合中选择一 种上行链路传输方法; 以及选择结果通知单元, 用于向中继节点通知所选上行链 路传输方法。
根据本发明的第三方面, 提出了一种中继节点, 包括: 接收单元, 用于接 收指示上行链路传输方法的消息; 以及上行链路传输单元, 用于根据接收的消息 所指示的上行链路传输方法, 进行上行链路传输。 附图说明
结合附图, 根据下面对本发明的非限制性实施例的详细描述, 本发明的上 述及其它目的、 特征和优点将变得更加清楚, 附图中:
1示出了部署有类型 I中继的系统中的基本节点和接口的示意图; 图 2示出了根据本发明第一实施例的上行链路传输方法的示意图; 图 3示出了根据本发明第二实施例的上行链路传输方法的示意图; 图 4示出了根据本发明第三实施例的上行链路传输方法的示意图; 以及 图 5 示出了实施根据本发明第五实施例的上行链路传输方法的系统配置示
具体实施方式
下面, 结合附图来详细描述本发明的实施例。 在以下描述中, 一些具体实 施例仅用于描述冃的, 而不应该理解为对本发明有任何限制, 而只是本发明的示 例。 需要指出的是, 示意图仅示出了与现有系统的区别, 而省略了常规结构或构 造, 以免导致对本发明的理解不清楚。
在 LTE A 中, 中继被用作一种增强技术, 用于实现基站和用户设备之间的 业务 /信令转发, 以实现更好的覆盖率和吞吐量的增加。
在引入中继节点的概念时,Un接口上的上行链路传输方法的一种直观方法是 重新使用现有的 Uu接口的 SR和 BSR过程。
图 2示出了根据本发明第一实施例的上行链路传输方法的示意图。在根据本 发明第 -实施例的上行链路传输方法中, 在 Un接口上采用现有的 SR和 BSR过程 (下面将该上行链路传输方法称为顺序 SR和顺序 BSR传输方法)。
首先, 在步骤 S201 , 用户设备触发 SR过程, 向中继节点发送调度请求。 在 歩骤 S202 , 中继节点向用户设备反馈上行链路调度授予消息。 然后, 用户设备在 歩骤 S203向中继节点发送 BSR消息。 在歩骤 S204 , 中继节点根据从用户设备接 收到的 BSR消息,分配上行链路资源,并向用户设备反馈上行链路调度授予消息。 接收到上行链路调度授予消息的用户设备在步骤 S205 处向中继节点发送上行链 路数据。 这是现有的 Uu接口上的 SR和 BSR过程。
当中继节点从用户设备接收到要传输给基站的上行链路数据, 并且数据所属 逻辑信道的优先级比其它可用数据的优先级更高时, 或者在没有其它数据要传输 的情况下, 中继节点将触发常规 BSR过程。 一旦触发了常规 BSR, 而中继节点没 有上行链路资源, 则触发 SR过程以请求上行链路资源。
因此, 在歩骤 S206, 中继节点向基站发送调度请求。 在步骤 S207, 基站向 中继节点反馈上行链路调度授予消息。 然后, 中继节点在歩骤 S208 向基站发送 BSR消息。 在步骤 S209 , 基站根据从中继节点接收到的 BSR消息, 分配上行链路 资源, 并向中继节点反馈上行链路调度授予消息。 接收到上行链路调度授予消息 的中继节点在步骤 S210处向基站发送上行链路数据。
因此, 可以很容易地将该方案引入规范。
在根据本发明第一实施例的上行链路传输方法中, 从用户设备到基站的上行 链路数据由于首先需要在 Un接口上请求上行链路资源而推迟。 在考虑上行链路 调度授予消息的子帧间隔的情况下, 该延迟可能会进一歩增加。
因此, 为了减少延迟并提高资源效率, 可以对 Un接口上的 SR和 BSR过程进 行一些改进。
根据本发明第一实施例的上行链路传输方法所引起的延迟来自多个方面。 首 先, 仅在用户设备的上行链路数据实际到达中继节点处时, 才触发 SR过程。 其 次,发送到基站的 BSR消息仅指示当时在中继节点的上行链路缓存器中的数据量, Ιίί]在中继节点向基站发送 BSR 消息之后到中继节点向基站发送上行链路数据之 间, 有可能有新的用户设备上行链路数据到达中继节点。 此外, 中继节点总是通 过 SR和 BSR过程来请求上行链路资源, 而实际上, 根据当前中继节点的负荷状 态, 可以使用一些适配机制。 图 3示出了根据本发明第二实施例的上行链路传输方法的示意图。
根据本发明第二实施例的上行链路传输方法与根据第一实施例的上行链路 传输方法的不同在于中继节点的 SR过程和 BSR过程的触发时间。 在根据本发明 第二实施例的上行链路传输方法中, 在中继节点从其所服务的用户设备接收到调 度请求时, 中继节点将在没有可用的上行链路资源时立即触发 SR过程。 当 SR周 期到达时, 向基站发送调度请求以请求上行链路资源。 同样地, 在根据本发明第 二实施例的上行链路传输方法中, 在中继节点从其所服务的用户设备接收到 BSR 消息时, 中继节点将产生 BSR消息并立即触发到基站的 BSR过程。
如图 3所示, 根据本发明第二实施例的上行链路传输方法中, 用户设备在歩 骤 S301触发 SR过程, 向中继节点发送调度请求。 接收到调度请求的中继节点将 在歩骤 S302触发 SR过程, 向基站发送调度请求。 然后, 在步骤 S303处, 中继 节点向用户设备反馈上行链路调度授予消息。 在步骤 S304 处, 基站向中继节点 反馈上行链路调度授予消息。 在步骤 S305处, 用户设备向中继节点发送 BSR消 息。
此后可以采用根据本发明第一实施例的歩骤 S206 S210。
在根据本发明第二实施例的上行链路传输方法中, 为了进一步减小延迟, 在 中继节点从其所服务的用户设备接收到 BSR消息时, 中继节点将立即触发 BSR过 程, 向基站发送 BSR消息。
因此, 在歩骤 S306处, 中继节点产生要发送到基站的 BSR消息。 此时, 中 继节点不仅考虑其 t)身的上行链路缓存器中的数据量, 还要考虑用户设备将发送 来的数据量。 然后, 在步骤 S307处, 中继节点触发常规的 BSR过程, 将所产生 的 BSR消息发送到基站。
用户设备将在步骤 S308 处从中继节点接收到上行链路调度授予消息, 并在 步骤 S3I0处向中继节点发送上行链路数据。
中继节点在歩骤 处从基站接收到上行链路调度授予消息之后, 将在步 骤 S31 1处向基站发送上行链路数据。
因此, 与根据本发明第一实施例的上行链路传输方法中用户设备处的 SR和 BSR过程与中继节点的 SR和 BSR过程是顺序执行的不同,在根据本发明第二实施 例的上行链路传输方法中, 用户设备处的 SR过程和 BSR过程与中继节点的 SR过 程和 I3SR过程是交错的 (即同时采用了增强 SR传输方法和增强 BSR传输方法)。 在根据本发明第二实施例的上行链路传输方法中, 在中继节点在接收到用户设备 的上行链路数据时, 可以立即将上行链路数据快速地传送给基站, 而不需等待漫 长的 SR过程和 BSR过程。
图 3示出的是根据本发明第二实施例的上行链路传输方法的一个示例。根据 本发明第二实施例的上行链路传输方法不 - -定必须满足上述 S301 S31 1的步骤顺 序。 例如, S302甚至可在 S303或 S305之后才触发, S307也有可能在 S308之后 才触发。 这可由中继节点进行配置。 图 4示出了根据本发明第三实施例的上行链路传输方法的示意图。
根据本发明第三实施例的上行链路传输方法与根据本发明第二实施例的上 行链路传输方法的不同在于省略了中继节点的 SR和 BSR过程。
与根据本发明第一和第二实施例的上行链路传输方法中中继节点通过 SR过 程和 BSR过程来请求上行链路资源不同, 在根据本发明第三实施例的上行链路传 输方法中, 基站采用预分配机制向中继节点分配上行链路资源。 中继节点以所分 配的资源, 向基站发送上行链路数据。 (下面将根据本发明第三实施例的上行链 路传输方法称为预分配资源传输方法)
如图 4所示,根据本发明第三实施例的上行链路传输方法的步骤 S401、S402、 S404、 S405、 S406、 S407、 S408分别与根据本发明第二实施例的上行链路传输方 法的步骤 S301、 S303、 S305、 S306、 S308、 S310、 S31 1相同。
代替中继节点的 SR过程和 BSR过程, 即步骤 S302、 S304和 S309, 在歩骤
S403处, 基站采用预分配机制向中继节点分配上行链路资源。 即, 针对未使用的 上行链路资源, 基站向中继节点发送上行链路调度授予消息, 以通知其可使用的 上行链路调度资源。
因此, 中继节点在不需要预先发送调度请求 SR和 BSR消息的情况下, 利用 预分配的上行链路资源, 就可以发送上行链路数据。
然而, 当中继节点没有数据要发送时, 中继节点将利用填充 (padd ing ) BSR 消息进行应答, 而这将增加上行链路干扰并降低资源使用率。 因此, 可以在中继 节点处于高业务负荷的情况下采用预分配资源传输方法。
需要注意, 当中继节点要发送的数据的优先级较高或诸如所分配的上行链路 资源不足等的其它一些情况下,中继节点也可以产生 BSR消息,并触发 BSR过程, 在所分配的资源上向基站发送 BSR消息, 以请求上行链路资源。 这里, 中继节点 产生的 BSR消息也可考虑到用户设备即将发送到中继节点的数据量。 此时, 可以 采用上述增强 BSR方法。
根据本发明第三实施例的上行链路传输方法 ώ于省略了 SR过程 (甚至可能 略了 BSR过程), 减少了系统延迟。 根据本发明第四实施例的上行链路传输方法与根据本发明第三实施例的上 行链路传输方法的不同在于上行链路资源的获取方式。
在根据本发明第四实施例的上行链路传输方法中, 基站向多个中继节点通知 未使用的上行链路资源。 中继节点采用基于竞争的上行链路传输方法, 直接在未 使用的资源上传输上行链路数据。 (下面将根据本发明第四实施例的上行链路传 输方法称为基于竞争的传输方法)这不需要 Un接口上的 SR过程, 因此可以进一 歩减少延迟和信令幵销。 与根据本发明第三实施例的上行链路传输方法相同, 在 根据本发明第四实施例的上行链路传输方法中, 中继节点也可以在需要时触发 BSR过程, 在所分配的资源上向基站发送 BSR消息, 以请求上行链路资源。 此时, 同样可以采用上述增强 BSR方法。
然而, 基于竞争的上行链路传输方法的主要缺点在于由于数据的冲突而导致 误码率上升。 因此, 根据本发明第四实施例的上行链路传输方法局限于低业务负 荷的情况, 在低业务负荷的情况下, 中继节点仅产生有限量的业务。 此外, 一旦 高优先级且延迟要求严格的业务到达中继节点而中继节点没有上行链路资源可 )13, 则可以使用基于竞争的上行链路传输方法。 根据本发明第—一至第四实施例的上行链路传输方法仅仅是在部署有中继节 点的系统中可以采用的上行链路传输方法的示例。还可以设计出其它运行环境下 的其它方法。
重要的是, 基站可以根据中继节点的上行链路业务统计参数, 动态地选择不 同的上行链路传输方法来实现良好的延迟性能和高资源使用率。
例如, 中继节点的上行链路业务统计参数可以是业务量的大小、 优先级等参 数。
例如, 甚站可以配置如下: 在中继节点处于相对较重负荷的情况下, 使用预分配资源传输方法; 在中继节点的负荷相对较轻的情况下, 使用增强 SR传输方法和 /或增强 BSR 传输方法;
在中继节点处于负荷更轻并且接收到具有严格延迟要求的高优先级数据的 情况下, 使用基于竞争的传输方法。 图 5 示出了实施根据本发明第五实施例的上行链路传输方法的系统配置示 意图。
如图 5所示, 在部署有中继节点的系统中, 基站 10包括传输方法选择单元 101、 调度单元 102和选择结果通知单元 103。 相应地, 中继节点 20包括选择结 果接收单元 201和上行链路传输单元 202。
传输方法选择单元 101 根据中继节点的上行链路业务统计参数, 选择适当 的上行链路传输方法。 可以根据情况, 预先给基站配置 /存储候选上行链路传输 方法集合。传输方法选择单元 101在候选上行链路传输方法集合中选择上行链路 传输方法。
然后, 传输方法选择单元 101 将选择结果告知调度单元 102和选择结果通 知单元 103。
选择结果通知单元 103则将基站的选择发送给中继节点 20的选择结果接收 单元 201。 例如, 可以在上行链路调度授予消息的标识字段中设置标记, 以将选 择结果告知中继节点。
然后, 在基站 10的调度单元 102和中继节点 20的上行链路传输单元 202 之间, 按照所选的上行链路传输方法, 进行上行链路数据传输。 如上所述, 上行 链路传输单元 202可按照上述第一实施例至第四实施例,进行上行链路数据传输。 当然, 中继节点 20还包括缓存器 (未示出), 用于缓存 h行链路数据。 当所选的 上行链路传输方法是根据第二实施例的上行链路传输方法时, 上行链路传输単元 202将根据缓存器中的数据量以及从用户设备接收到的 BSR消息, 产生要发送到 基站的 BSR消息, 并将产生的 BSR消息发送给基站。
此时, 传输方法选择单元 101 可持续地监控中继节点的上行链路业务统计 参数, 并根据需要重新选择上行链路传输方法。
尽管以上描述涉及多个单元, 但是通过将一个单元划分为多个单元或将多 个单元组合为 - 个单元, 只要其仍能执行相应的功能, 也可以实现本发明。 本领域技术人员应该很容易认识到, 可以通过编程计算机实现上述方法的 不同歩骤。 在此, 一些实施方式同样包括机器可读或计算机可读的程序存储设备 (如, 数字数据存储介质) 以及编码机器可执行或计算机可执行的程序指令, 其 中, 该指令执行上述方法的一些或全部歩骤。 例如, 程序存储设备可以是数字存 储器、 磁存储介质 (如磁盘和磁带)、 硬件或光可读数字数据存储介质。 实施方 式同样包括执行上述方法的所述步骤的编程计算机。
描述和附图仅示出本发明的原理。 因此应该意识到, 本领域技术人员能够 建议不同的结构, 虽然这些不同的结构未在此处明确描述或示出, 但体现了本发 明的原理并包括在其精神和范围之内。 此外, 所有此处提到的示例明确地主要只 用于教学目的以帮助读者理解本发明的原理以及发明人所贡献的促进本领域的 构思, 并应被解释为不是对这些特定提到的示例和条件的限制。 此外, 此处所有 提到本发明的原则、 方面和实施方式的陈述及其特定的示例包含其等同物在内。
上面的描述仅用于实现本发明的实施方式, 本领域的技术人员应该理解, 在不脱离本发明的范围的任何修改或局部替换, 均应该属于本发明的权利要求来 限定的范围, 因此, 本发明的保护范围应该以权利要求书的保护范围为准。

Claims

权 利 要 求
1 . 一种上行链路传输方法, 包括歩骤:
根据中继节点的上行链路业务统计参数, 在候选上行链路传输方法集合中 选择一种上行链路传输方法;
向中继节点通知所选上行链路传输方法; 以及
中继节点按照所选上行链路传输方法, 进行上行链路传输。
2. 根据权利要求 1所述的方法, 其中, 所述候选上行链路传输方法集合包 括以下方法屮的至少一种: 基于调度请求的传输方法; 预分配资源传输方法; 以 及基于竞争的传输方法。
3. 根据权利要求 2所述的方法, 其中,
如果所选上行链路传输方法是预分配资源传输方法, 则中继节点在预分配 的资源上进行上行链路传输。
4. 根据权利要求 2所述的方法, 其中,
如果所选上行链路传输方法是基于竞争的传输方法, 则中继节点基于竞争 机制, 在预分配的竞争资源上进行上行链路传输。
5. 根据权利要求 2所述的方法, 其中,
如果所选上行链路传输方法是基于调度请求的方法, 则中继节点在接收到 用户设备的上行链路数据或上行链路调度请求时, 向基站发送上行链路调度请 求, 以请求分配上行链路资源; 以及中继节点在分配的上行链路资源上传输上行 链路数据。
6. 根据权利要求 5所述的方法, 在中继节点向基站发送上行链路调度请求 的歩骤之后, 进一歩包括:
中继节点基于缓存器中的数据量, 产生缓存器状态报告消息, 并将产生的 缓存器状态报告消息发送到基站。
7. 根据权利要求 3 5之一所述的方法, 进一歩包括:
中继节点在从用户设备接收到缓存器状态报告消息时, 根据缓存器中的数 据量和接收到的缓存器状态报告消息, 产生要发送到基站的缓存器状态报告消 息, 并将产生的缓存器状态报告消息发送到基站。
8. 根据权利要求 1 7之一所述的方法, 其中, 利用上行链路调度授予消息, 向中继节点通知所选上行链路传输方法。
9. 一种基站, 包括:
传输方法选择单元, 用于根据中继节点的上行链路业务统计参数, 在候选 上行链路传输方法集合中选择一种上行链路传输方法; 以及
选择结果通知单元, 用于向中继节点通知所选上行链路传输方法。
10. 根据权利要求 9 所述的基站, 其中, 所述候选上行链路传输方法集合 包括以下方法中的至少一种: 基于调度请求的传输方法; 预分配资源传输方法; 以及基于竞争的传输方法。
1 1 . 一种中继节点, 包括:
接收单元, 用于接收指示上行链路传输方法的消息; 以及
上行链路传输单元, 用于根据接收的消息所指示的上行链路传输方法, 进 行上行链路传输。
12. 根据权利要求 1 1所述的中继节点, 其中,
如果接收的消息指示了预分配资源传输方法, 则上行链路传输单元在预分 配的资源上进行上行链路传输。
13. 根据权利要求 1 1所述的中继节点, 其中,
如果接收的消息指示了基于竞争的传输方法, 则上行链路传输单元基于竞 争机制, 在预分配的竞争资源上进行上行链路传输。
14. 根据权利要求 1 1所述的中继节点, 其中, 如果接收的消息指示了基于 调度请求的方法, 则上行链路传输单元在接收到用户设备的上行链路数据或上行 链路调度请求时, 向基站发送上行链路调度请求, 以请求分配上行链路资源; 以 及在分配的上行链路资源上传输上行链路数据。
15. 根据权利要求 14所述的中继节点, 其中, 上行链路传输单元还基于缓 存器中的数据量; 产生缓存器状态报告消息, 并将产^的缓存器状态报告消息发 送到基站。
16. 根据权利要求 12 14 之一所述的中继节点, 其中, 上行链路传输单元 在从用户设备接收到缓存器状态报告消息时, 根据缓存器中的数据量和接收到的 缓存器状态报告消息, 产生要发送到基站的缓存器状态报告消息, 并将产生的缓 存器状态报告消息发送到基站。
PCT/CN2010/071126 2010-03-18 2010-03-18 上行链路传输方法、基站和中继节点 WO2011113202A1 (zh)

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