WO2009086744A1 - 多跳中继网络中的中继站广播消息传输方法 - Google Patents

多跳中继网络中的中继站广播消息传输方法 Download PDF

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Publication number
WO2009086744A1
WO2009086744A1 PCT/CN2008/070494 CN2008070494W WO2009086744A1 WO 2009086744 A1 WO2009086744 A1 WO 2009086744A1 CN 2008070494 W CN2008070494 W CN 2008070494W WO 2009086744 A1 WO2009086744 A1 WO 2009086744A1
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Prior art keywords
message
relay station
relay
base station
map
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PCT/CN2008/070494
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English (en)
French (fr)
Inventor
Yuqin Chen
Hongyun Qu
Original Assignee
Zte Corporation
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Publication date
Application filed by Zte Corporation filed Critical Zte Corporation
Priority to US12/745,205 priority Critical patent/US8442431B2/en
Priority to EP20080715230 priority patent/EP2204925B1/en
Publication of WO2009086744A1 publication Critical patent/WO2009086744A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Definitions

  • the present invention relates to the field of communications, and more particularly to a relay station broadcast message transmission method in a non-transparent centralized scheduling multi-hop relay network.
  • a multi-hop relay system one or several relay stations (RSs) are set in a multi-hop relay base station (MR-BS) and Between mobile terminals (MSs), the relay stations transmit relay signals to base stations and terminal signals to achieve coverage expansion and system capacity increase.
  • the relay station can be set as a fixed relay station or a mobile relay station.
  • the relay station can be divided into a transparent relay station and a non-transparent relay station, the former not generating and transmitting prefix and control messages.
  • the base station supporting multi-hop relay will be referred to as a base station hereinafter.
  • a transmission link from a terminal to a relay station and finally to a base station is composed of an access link and a relay link.
  • the access link is a communication link that starts or ends at the terminal, and may be a link between the terminal and a base station directly connected thereto, or may be a link between the terminal and a relay station connected thereto.
  • a relay link is a link between a base station and a relay station connected thereto or a communication link between two relay stations.
  • a relay station directly connected to a terminal is called an access relay station.
  • the base station uniformly allocates resources for the access link and the relay link of the multi-hop relay cell and generates a corresponding MAP (Map message), or the relay station generates its own MAP according to the indication information of the base station.
  • the base station and the relay station respectively determine the resource allocation of the sub-relay station or the terminal and generate a corresponding MAP.
  • the present invention is applicable to a multi-hop relay network that is non-transparent centralized scheduling.
  • the frame structure of the base station and the relay station respectively include one uplink subframe and one downlink subframe, and each uplink subframe and each downlink subframe respectively have an access region and a relay region. Composition.
  • the access area is used for transmission of the access link, and the relay area is used for The transmission of the relay link.
  • the relay MAP refers to a MAP message transmitted by a base station or a relay station in a relay area.
  • a DCD (Downlink Channel Description) / UCD (Uplink Channel Description) broadcast message transmitted by a relay station is generated by a base station.
  • the base station sends the generated relay station broadcast message to the relay station on the primary management CID (connection ID) or the multicast management CID of the relay station, and after receiving the relay station, reads the information in the MAC (Media Access Control) header, and realizes
  • the message is a DCD/UCD message to be forwarded to the underlying site, and then a reply header is sent indicating that it has received the message.
  • Each message should correspond to a confirmation header. Base station If the acknowledgment header has not been received when the timer expires, the management message should be resent.
  • the relay station Before each time the message is sent to the lower-layer site periodically, the relay station sends a bandwidth request header to apply for the downlink bandwidth to the base station, and the base station allocates the appropriate bandwidth through a MAP IE, and then the relay station uses the segmentable broadcast on the bandwidth.
  • CID forwards DCD/UCD.
  • the prior art solution has two major drawbacks. One is that the overhead caused by the bandwidth application header sent each time is too large, and the second is that after receiving the bandwidth request, the base station cannot guarantee that the downlink bandwidth can be allocated to the relay station immediately, that is, A large delay is generated.
  • the technical problem to be solved by the present invention is to provide a relay station broadcast message transmission method in a multi-hop relay network, which can reduce system overhead and delay.
  • the present invention provides a relay station broadcast message transmission method in a multi-hop relay network, which is applicable to a non-transparent centralized scheduling multi-hop relay network, including:
  • the base station sends a message to be broadcasted to the relay station, and the relay station returns an acknowledgment header to the base station after receiving the acknowledgment header, and the base station periodically sends a message indicating the downlink bandwidth allocation to the relay station, and is used to indicate that the base station actively allocates the relay station.
  • the downlink bandwidth the relay station transmits a broadcast message to the terminal or the lower relay station in the downlink bandwidth.
  • the base station periodically sends a message indicating the downlink bandwidth allocation to the relay station after receiving the acknowledgment header, which means:
  • the base station After receiving the acknowledgment header, the base station relays the periodic transmission interval according to the relay station sending the broadcast message.
  • the station periodically allocates downlink bandwidth and transmits a message indicating the downlink bandwidth allocation to the relay station, the periodic transmission interval of the relay station broadcast message being defined at the initial setting of the relay station or notifying the base station when the basic capability is interactive.
  • the relay station returns a confirmation message header and a configuration change count value to the base station. If the base station finds that the broadcast message of the relay station changes, or the base station does not receive the acknowledgment header within the predetermined time, it resends the to-be broadcast to the relay station. Message.
  • a type indication is added to the message indicating the downlink bandwidth allocation, where the message indicates that the downlink bandwidth allocated by the base station to the relay station is actively indicated.
  • the message indicating the downlink bandwidth allocation further includes a sending message type, which is used to indicate a type of the broadcast message sent by the relay station in the corresponding downlink bandwidth.
  • the message indicating the downlink bandwidth allocation further includes one or all of the following fields:
  • a DL-MAP IE index number used to indicate a location of a burst in which the broadcast message sent by the relay station to the terminal is located
  • the R-DL-MAP IE index number is used to indicate the location of the burst in which the broadcast message sent by the relay station to the lower layer relay station is located.
  • the relay station receives the k-th DL-MAP IE message in the DL-MAP message in the next available frame after receiving the message indicating the downlink bandwidth allocation.
  • a message is sent in the indicated burst, and the frame number of the next available frame is defined in the RS RLY MAP message.
  • the relay station receives the message indicating the downlink bandwidth allocation, and is in the next available frame in the kth R in the R-DL-MAP message.
  • a message is sent in a burst indicated by the DL-MAP IE, and the frame number of the next available frame is defined in the RS RLY MAP message.
  • the message indicating the downlink bandwidth allocation is an RS-BW_ALLOC_IE message.
  • broadcast message includes any one or any of the following messages:
  • DCD message or UCD message, or MOP-NBR-ADV message.
  • the overhead caused by the relay station transmitting the management message such as DCD/UCD can be reduced, and the bandwidth for transmitting the management message can be allocated in time, and the delay is reduced.
  • Figure 1 is a schematic diagram of a wireless multi-hop relay network
  • Figure 2 is a flow chart of the transmission of DCD/UCD broadcast messages of a relay station in a multi-hop relay network.
  • the relay station after receiving the management message such as DCD/UCD, the relay station saves it and periodically broadcasts it to the terminal or the lower relay station on the downlink.
  • the present invention proposes that the bandwidth used by the relay station to transmit broadcast messages on the downlink is actively allocated by the base station, and the relay station is not required to apply to the base station before each transmission.
  • the periodic transmission interval of the relay station broadcast message is defined at the initial setting of the relay station or tells the base station when the basic capability is interactive.
  • the base station actively allocates the downlink bandwidth for the relay station period according to the periodic transmission interval of the relay station broadcast message, and is indicated by a specific MAP IE (Map Message Indication Unit), and the MAP IE indicates the message type corresponding to the allocated resource block through some fields.
  • MAP IE Map Message Indication Unit
  • the base station changes the "configuration change count" field therein and resends it to the relay station, and the relay station receives a new DCD/UCD management message and saves it, and then re-executes the above transmission process.
  • a multi-hop relay network defined by IEEE802.16j will be taken as an example for explanation.
  • the signal transmission between the base station and the terminal is relayed via one or more hops. to make.
  • the transmission process of the relay station DCD/UCD broadcast message in the multi-hop relay network is as shown in FIG. 2, and includes the following steps:
  • Step 210 Generate, by the base station, a DCD/UCD message broadcasted by the relay station in the downlink, and send the resource block indicated by the relay MAP to the relay station in the relay area.
  • Step 220 After receiving the relay station, feedback a confirmation header indicating that the DCD/UCD message is received by the confirmation header, and the confirmation header includes the DCD/UCD message type, and uses the lower 8 bits of the “configuration change count” field in the DCD/UCD as the interaction ID. ;
  • step 210 the base station sets a timer after transmitting the DCD/UCD message. If the base station does not receive the acknowledgment header when the timer expires, the DCD/UCD message should be resent.
  • Step 230 After receiving the acknowledgment sent by the relay station, the base station periodically instructs the relay station to use the RS-BW-ALLOC_IE message in the relay MAP to send the resource block used by the DCD/UCD in the downlink.
  • the base station If the "configuration change count" field in the DCD/UCD message does not change, the base station periodically allocates a downlink bandwidth to the relay station according to the time interval at which the relay station transmits the DCD/UCD message, and the relay station uses the bandwidth broadcast to transmit its stored DCD. /UCD message. If the "Configuration Change Count" field in the DCD/UCD message changes, the base station regenerates the DCD/UCD message and sends it to the relay station (ie, re-execute step 210).
  • the DCD/UCD message is taken as an example.
  • the broadcast is also performed according to the method in the above example, and will not be described here.
  • RS—BW—ALLOC—IE() is a type of R-link Specific IE() that is in the RS-RLY-MAP message.
  • the RS-BW-ALLOC-IE defined in the IEEE 802.16j-D2 protocol is only used to allocate bandwidth for the relay station on the downlink access link.
  • a new field is added for the IE, so that the base station is the access link and relay of the relay station in the downlink. The link allocates bandwidth to transmit the relay broadcast message, and sets the base station to periodically send the bandwidth
  • RS-BW—ALLOC—IE makes it unnecessary for the relay station to send a bandwidth request.
  • RS-BW-ALLOC-IE a new message type is added (see OblO in the table). If the message type is OblO, it indicates that the IE is used for the base station to actively allocate bandwidth for the downlink of the relay station. .
  • the RS-BW_ALLOC-IE When the message type is OblO, the RS-BW_ALLOC-IE also carries the following information: a message type, a DL-MAP IE (downlink mapping message indication unit) index number, and an R-DL-MAP IE index number. among them:
  • the "send message type" field is used to tell the relay station the type of message to be broadcasted in the allocated resource block, which may be a DCD message or a UCD message, or a MOB_NBR-ADV message, etc.;
  • the "DL-MAP IE Index Number” field indicates the DL-MAP IE that allocates bandwidth for the downlink access link of the relay; after receiving this field, the relay station should be in the next available frame in the DL-MAP message.
  • the "R-DL-MAP IE Index Number” field indicates the R-DL-MAP IE that allocates bandwidth for the downlink relay link of the relay; after receiving this field, the relay station shall be in the next available frame by R-DL.
  • the burst indicated by the kth R-DL-MAP IE in the MAP message sends a message to the relay station, and the frame number of the next available frame is defined in the RS_RLY_MAP message.
  • broadcast messages described herein are not limited to DCD/UCD messages and MOB-NBR-ADV messages, but may be other broadcast messages.
  • the method of the present invention can reduce the overhead caused by the relay station transmitting management messages such as DCD/UCD, and can ensure that the bandwidth for transmitting the management message can be allocated in time, and the delay is reduced.

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

Description

多跳中继网络中的中继站广播消息传输方法
技术领域
本发明涉及通信领域， 更具体地涉及一种非透明集中式调度多跳中继网 络中的中继站广播消息传输方法。
背景技术
如图 1所示， 在多跳中继系统中， 一个或数个中继站（Relay Station, 简 称 RS )被设置在支持多跳中继的基站（Multi-hop Relay Base Station, 简称 MR-BS )和移动终端 （Mobile Stations, 简称 MS )之间， 通过中继站对基站 和终端信号的中继传输来达到覆盖范围的扩展以及系统容量的增加。 为了满 足不同应用场景的需要， 中继站可以设置为固定中继站或者移动中继站。 根 据是否产生并发送前缀和控制消息， 中继站可以被区分成透明中继站和非透 明中继站， 前者不产生并发送前缀和控制消息。 后文中将支持多跳中继的基 站简称为基站。
在多跳中继网络中， 从终端经过中继站、 最后到基站的传输链路由接入 链路和中继链路构成。 其中， 接入链路为起始或结束于终端的通信链路， 可 以是终端和直接与之连接的基站之间的链路， 也可以是终端和与之连接的中 继站之间的链路。 中继链路为基站和与之连接的中继站之间的链路或者两个 中继站之间的通信链路。 与终端直接相连的中继站称为接入中继站。
在集中式调度中， 基站统一为多跳中继小区的接入链路和中继链路分配 资源并产生相应的 MAP (映射消息）， 或者由中继站根据基站的指示信息产 生自己的 MAP。 分布式调度中， 基站和中继站分别决定子中继站或终端的资 源分配并产生相应的 MAP。 本发明适用于非透明集中式调度的多跳中继网 络。
在非透明中继站情况下， 基站和中继站的帧结构中分别包含一个上行子 帧和一个下行子帧， 而每个上行子帧和每个下行子帧又分别由一个接入区域 和一个中继区域构成。 其中， 接入区域用于接入链路的传输， 中继区域用于 中继链路的传输。 中继 MAP是指由基站或者中继站在中继区域发送的 MAP 消息。
在非透明集中式调度的多跳中继网络中， 中继站广播发送的 DCD (下行 信道描述） /UCD (上行信道描述）广播消息由基站产生。 基站将产生的中继 站广播消息在中继站的首要管理 CID ( connection ID, 连接标识）或者多播管 理 CID上发送给中继站， 中继站接收之后， 读取 MAC (媒体接入控制 ) 头 中的信息， 意识到该消息是要转发给下层站点的 DCD/UCD消息， 然后回复 一个确认头表示自己已经接收到该消息。 每个消息应对应一个确认头。 基站 如果在定时器过期时还没有收到确认头， 应重新发送管理消息。 在每次周期 性地向下层站点发送该消息之前， 中继站发送一个带宽申请头向基站申请下 行带宽， 基站通过一个 MAP IE为其分配合适的带宽， 然后中继站在该带宽 上使用可分段的广播 CID将 DCD/UCD转发下去。
现有技术方案有两大缺点， 一是由每次发送的带宽申请头带来的开销过 大， 二是基站在收到带宽申请之后， 并不能保证立即有下行带宽可以分配给 该中继站， 即产生较大的时延。
发明内容
本发明要解决的技术问题是提供一种多跳中继网络中的中继站广播消息 传输方法， 能够减少系统开销和时延。
为了解决上述技术问题， 本发明提供了一种多跳中继网络中的中继站广 播消息传输方法， 适用于非透明集中式调度的多跳中继网络， 包括：
基站将待广播的消息发送给中继站， 中继站收到后向基站返回确认头， 基站在收到确认头后周期性地向中继站发送指示下行链路带宽分配的消息， 用于指示基站主动为中继站分配的下行链路带宽， 所述中继站在该下行链路 带宽中向终端或者下层中继站发送广播消息。
进一步的， 基站在收到确认头后周期性地向中继站发送指示下行链路带 宽分配的消息是指：
基站在收到确认头后， 按照中继站发送广播消息的周期发送间隔为中继 站周期性地分配下行链路带宽并向中继站发送指示下行链路带宽分配的消 息， 所述中继站广播消息的周期发送间隔在中继站初始设置时定义或在基本 能力交互时告知基站。
进一步的， 中继站向基站返回确认头中携带有消息类型和配置变化计数 值， 如果基站发现中继站的广播消息发生改变， 或者基站在预定时间内仍未 收到确认头， 则重新向中继站发送待广播的消息。
进一步的， 在所述指示下行链路带宽分配的消息中增加一种类型指示， 用于表示该消息指示了基站主动为中继站分配的下行链路带宽。
进一步的， 所述指示下行链路带宽分配的消息中还包括发送消息类型， 用于指示中继站在相应下行带宽中发送的广播消息的类型。
进一步的， 所述指示下行链路带宽分配的消息中还包括以下字段中的一 个或全部：
DL-MAP IE索引号， 用于指示中继站向终端发送的广播消息所在的突发 的位置；
R-DL-MAP IE索引号， 用于指示中继站向下层中继站发送的广播消息所 在的突发的位置。
进一步的， 当 DL-MAP IE索引号为 k时， 中继站在接收到该指示下行链 路带宽分配的消息之后， 在下一个可用帧中在由 DL-MAP 消息中的第 k个 DL-MAP IE 消息指示的突发中发送消息， 所述下一个可用帧的帧号在 RS RLY MAP消息中定义。
进一步的， 当 R-DL-MAP IE索引号为 k时， 中继站在接收到该指示下行 链路带宽分配的消息之后， 在下一个可用帧中在由 R-DL-MAP消息中的第 k 个 R-DL-MAP IE 指示的突发中发送消息， 所述下一个可用帧的帧号在 RS RLY MAP消息中定义。
进一步的， 所述指示下行链路带宽分配的消息为 RS—BW— ALLOC— IE消 息。
进一步的， 所述广播消息包括以下消息中的任一种或任意几种：
DCD消息、 或 UCD消息、 或 MOP— NBR-ADV消息。 釆用本发明的所述方法， 可以减小中继站发送 DCD/UCD等管理消息带 来的开销， 并能确保用于发送该管理消息的带宽能够及时分配， 减小了时延。 附图概述
此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部 分， 本发明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的 不当限定。 在附图中：
图 1为无线多跳中继网络示意图；
图 2为多跳中继网络中中继站 DCD/UCD广播消息的传输流程图。
本发明的较佳实施方式
下面将结合附图及实施例对本发明的技术方案进行更详细的说明。
由上所述， 中继站收到 DCD/UCD等管理消息之后， 保存下来， 周期地 在下行链路上向终端或者下层中继站广播发送。 为了节省开销， 并确保带宽 及时分配， 本发明提出， 中继站在下行链路上发送广播消息使用的带宽由基 站主动分配， 而不需要中继站在每次发送前都向基站申请。
中继站广播消息的周期发送间隔在中继站初始设置时定义或在基本能力 交互时告诉基站。 基站按照中继站广播消息的周期发送间隔主动为中继站周 期分配下行链路带宽， 由特定的 MAP IE (映射消息指示单元）进行指示， MAP IE通过某些字段指示所分配的资源块对应的消息类型。
如果中继站广播的 DCD/UCD等管理消息发生改变，基站改变其中的 "配 置变化计数" 字段并重新发送给中继站， 中继站接收新的 DCD/UCD等管理 消息并保存， 然后重新执行上述发送过程。
下面参考附图， 以 IEEE802.16j定义的多跳中继网络为例， 进行说明。 在多跳中继网络中， 基站和终端之间的信号传递经由一跳或多跳中继完 成。 如图 1所示， 基站 BS与移动终端 MS7之间的传输路径上有 1个中继站 RS3 ,基站 BS与移动终端 MS5之间的传输路径上有 2个中继站 RS1和 RS2。
在集中式调度模式下， 多跳中继网络中中继站 DCD/UCD广播消息的传 输过程如图 2所示， 包括以下步骤：
步骤 210, 由基站产生中继站在下行链路广播的 DCD/UCD消息， 并在 中继区域中使用中继 MAP指示的资源块发送给中继站；
步骤 220, 中继站收到之后， 反馈一个确认头表示自己收到该 DCD/UCD 消息， 确认头中包含 DCD/UCD消息类型， 并以 DCD/UCD中 "配置变化计 数" 字段低 8位作为交互 ID;
在另一实施例中， 在步骤 210中， 基站发送 DCD/UCD消息后设置一定 时器， 如果基站在定时器过期时还没有收到确认头， 应重新发送 DCD/UCD 消息。
步骤 230, 基站收到中继站发来的确认之后， 周期性地通过中继 MAP中 的 RS— BW-ALLOC— IE消息指示中继站在下行链路中发送 DCD/UCD所使用 的资源块。
如果 DCD/UCD消息中的 "配置变化计数" 字段不变， 基站就按照中继 站发送 DCD/UCD消息的时间间隔周期地给中继站主动分配下行链路带宽， 中继站使用该带宽广播发送自己所存储的 DCD/UCD消息。 如果 DCD/UCD 消息中的 "配置变化计数" 字段发生了变化， 那么基站重新生成 DCD/UCD 消息， 向中继站发送（即重新执行步骤 210 ) 。
上例以 DCD/UCD消息为例进行了说， 对于 MOB— NBR-ADV等消息， 也是按照上例的方法进行广播， 这里不再赘述。
为了适应本实施例中继站 DCD/UCD 广播消息传输方法， 对 RS—BW— ALLOC— IE所作的修改见表 3。 RS— B W— ALLOC— IE()是 R-link Specific IE()的一种， 处于 RS— RLY— MAP消息中。 在 IEEE802.16j— D2协议中定义的 RS—BW— ALLOC— IE仅用来为中继站在下行接入链路分配带宽。 在本文中， 为该 IE增加了新的字段，从而使基站为中继站在下行链路的接入链路和中继 链路分配带宽， 来传输中继站广播消息， 并设置基站周期性地下发该
RS—BW— ALLOC— IE, 使中继站不必再发送带宽申请。
表 3 对 IEEE802.16j— D2版本中 RS—BW— ALLOC— IE进行的修改
Figure imgf000008_0001
Figure imgf000009_0001
在 RS— BW— ALLOC— IE中， 新增加了一种消息类型 （见表中的 OblO ) , 如果消息类型为 OblO,说明该 IE是用于基站主动周期地为中继站下行链路分 配带宽的情况。
当消息类型为 OblO时， RS—BW— ALLOC— IE中还携带有以下信息： 发送 消息类型、 DL-MAP IE(下行链路映射消息指示单元 )索引号和 R-DL-MAP IE 索引号， 其中：
"发送消息类型" 字段是用来告诉中继站将在所分配的该资源块中广播 发送的消息类型，可以是 DCD消息或是 UCD消息，或者是 MOB— NBR-ADV 消息， 等等；
"DL-MAP IE索引号" 字段指示了为中继站的下行接入链路分配带宽的 DL-MAP IE; 中继站在接收到这个字段之后， 应在下一个可用帧中在由 DL-MAP消息中的第 k个 DL-MAP IE消息指示的突发中向终端发送消息，所 述下一个可用帧的帧号在 RS— RLY— MAP消息中定义； "R-DL-MAP IE索引号" 字段指示了为中继站的下行中继链路分配带宽 的 R-DL-MAP IE; 中继站在接收到这个字段之后， 应在下一个可用帧中在由 R-DL-MAP消息中的第 k个 R-DL-MAP IE指示的突发中向中继站发送消息， 所述下一个可用帧的帧号在 RS— RLY— MAP消息中定义。
以上所述仅为本发明的实施例而已， 并不用于限制本发明， 对于本领域 的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则 之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的权利要求 范围之内。
例如， 除 RS—BW— ALLOC— IE消息外， 也可以对其他消息进行类似修改， 将其作为指示下行链路带宽分配的消息。 例如， 文中所述的广播消息不限于 DCD/UCD 消息和 MOB— NBR-ADV 消息， 还可以是其他广播消息。
工业实用性 本发明的方法可以减小中继站发送 DCD/UCD等管理消息带来的开销， 并能确保用于发送该管理消息的带宽能够及时分配， 减小了时延。

Claims

权 利 要 求 书
1、 一种多跳中继网络中的中继站广播消息传输方法，适用于非透明集中 式调度的多跳中继网络， 其特征在于， 包括：
基站将待广播的消息发送给中继站， 中继站收到后向基站返回确认头， 基站在收到确认头后周期性地向中继站发送指示下行链路带宽分配的消息， 用于指示基站主动为中继站分配的下行链路带宽， 所述中继站在该下行链路 带宽中向终端或者下层中继站发送广播消息。
2、 如权利要求 1所述的方法，其特征在于，基站在收到确认头后周期性 地向中继站发送指示下行链路带宽分配的消息是指：
基站在收到确认头后， 按照中继站发送广播消息的周期发送间隔为中继 站周期性地分配下行链路带宽并向中继站发送指示下行链路带宽分配的消 息， 所述中继站广播消息的周期发送间隔在中继站初始设置时定义或在基本 能力交互时告知基站。
3、 如权利要求 1所述的方法， 其特征在于，
中继站向基站返回确认头中携带有消息类型和配置变化计数值， 如果基 站发现中继站的广播消息发生改变，或者基站在预定时间内仍未收到确认头， 则重新向中继站发送待广播的消息。
4、 如权利要求 1所述的方法， 其特征在于，
在所述指示下行链路带宽分配的消息中增加一种类型指示， 用于表示该 消息指示了基站主动为中继站分配的下行链路带宽。
5、 如权利要求 4所述的方法， 其特征在于，
所述指示下行链路带宽分配的消息中还包括发送消息类型， 用于指示中 继站在相应下行带宽中发送的广播消息的类型。
6、 如权利要求 5所述的方法， 其特征在于，
所述指示下行链路带宽分配的消息中还包括以下字段中的一个或全部：
DL-MAP IE索引号， 用于指示中继站向终端发送的广播消息所在的突发 的位置； R-DL-MAP IE索引号， 用于指示中继站向下层中继站发送的广播消息所 在的突发的位置。
7、 如权利要求 6所述的方法， 其特征在于，
当 DL-MAP IE索引号为 k时， 中继站在接收到该指示下行链路带宽分配 的消息之后， 在下一个可用帧中在由 DL-MAP消息中的第 k个 DL-MAP IE 消息指示的突发中发送消息， 所述下一个可用帧的帧号在 RS— RLY— MAP消 息中定义。
8、 如权利要求 6所述的方法， 其特征在于，
当 R-DL-MAP IE索引号为 k时， 中继站在接收到该指示下行链路带宽分 配的消息之后，在下一个可用帧中在由 R-DL-MAP消息中的第 k个 R-DL-MAP IE指示的突发中发送消息， 所述下一个可用帧的帧号在 RS— RLY— MAP消息 中定义。
9、 如权利要求 1至 8中任一权利要求所述的方法， 其特征在于， 所述指示下行链路带宽分配的消息为 RS—BW— ALLOC— IE消息。
10、 如权利要求 1至 8中任一权利要求所述的方法， 其特征在于， 所述广播消息包括以下消息中的任一种或任意几种：
DCD消息、 或 UCD消息、 或 MOP— NBR-ADV消息。
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