WO2012013026A1 - 一种中继节点接入网络的方法和系统 - Google Patents

一种中继节点接入网络的方法和系统 Download PDF

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Publication number
WO2012013026A1
WO2012013026A1 PCT/CN2011/070496 CN2011070496W WO2012013026A1 WO 2012013026 A1 WO2012013026 A1 WO 2012013026A1 CN 2011070496 W CN2011070496 W CN 2011070496W WO 2012013026 A1 WO2012013026 A1 WO 2012013026A1
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Prior art keywords
denb
information
mme
cell
relay node
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PCT/CN2011/070496
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English (en)
French (fr)
Inventor
邓云
王冠宙
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to US13/806,333 priority Critical patent/US20130094435A1/en
Priority to BR112013000900-4A priority patent/BR112013000900B1/pt
Priority to EP11811728.2A priority patent/EP2574110B1/en
Priority to JP2013519940A priority patent/JP5627776B2/ja
Publication of WO2012013026A1 publication Critical patent/WO2012013026A1/zh

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    • 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
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • 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 mobile communications, and in particular, to a method and system for a relay node to access a network. Background technique
  • the third generation mobile communication Long Term Evolution (LTE) system consists of Evolved Universal Terrestrial Radio Access Network (E-UTRAN), User Equipment (UE, User Equipment), and evolved packet core.
  • EPC Evolved Packet Core
  • the E-UTRAN is composed of an enhanced base station (eNB) of the access network element.
  • the eNB is connected to the terminal UE through the Uu interface, and is connected to the core network element such as the Mobility Management Entity (MME) through the S1 interface.
  • MME Mobility Management Entity
  • LTE-Advanced Long-Term Evolution advance
  • the wireless relay technology is one of the technologies in LTE-Advanced. It aims to extend the coverage of the cell, reduce the dead zone in the communication, balance the load, transfer the traffic in the hot spot, and save the UE's transmit power.
  • the relay node (RN, Relay Node) is connected to the UE through the Uu interface to provide the function of the base station.
  • the RN is connected to the base station through the Un interface to provide the functions of the UE.
  • the base station connected to the RN is called a donor base station (DeNB, Donor eNB), and the DeNB is connected to the core network element such as the MME through the SI interface.
  • the RN maintains a connection with a core network element such as the MME through a DeNB proxy.
  • the relay function of data transmission between the RN and the base station and between the RN and the UE managed by itself is realized, the coverage of the extended cell is achieved, the dead zone in the communication is reduced, the load is balanced, and the service in the hot spot is transferred. Save the UE's transmit power and other purposes.
  • the RN establishes radio resource control (RRC) in the cell under the jurisdiction of the access DeNB.
  • RRC radio resource control
  • DRB data radio bearer
  • S1 and X2 interface signaling of the UE, the data of the UE under the cell under the jurisdiction of the Relay, and the like.
  • Step 201 After establishing an RRC connection with the DeNB, the RN performs non-access stratum (NAS, Non Access Stratum) signaling interaction with the MME selected by the DeNB to complete identity information acquisition, authentication, and security setup (Security Setup);
  • NAS Non Access Stratum
  • the NAS signaling is an attach request initiated by the RN.
  • Step 202 The MME implements information interaction with other network elements of the core network, for example, obtaining subscription information of the RN from a Home Subscriber Server (HSS);
  • HSS Home Subscriber Server
  • Step 203 The MME performs an S1 signaling interaction with the DeNB, so that the DeNB learns that the access node to the DeNB is the RN, and obtains the context information of the RN, such as the radio access bearer that the RN needs to establish (E-RAB, E-UTRAN Radio Access Bearer).
  • E-RAB E-UTRAN Radio Access Bearer
  • Step 204 The DeNB establishes a data radio bearer for the RN.
  • the prior art proposes to implement the selection of the DeNB and the MME in a pre-configured manner, which requires the network operator to select the DeNB list for the RN in advance and Corresponding MME, and the selected part of the information is pre-written into the RN device.
  • the DeNB is selected according to the pre-configured information, and the MME identity information is provided to the DeNB, so that the DeNB selects an appropriate MME.
  • the pre-configuration method may be used to prevent the RN from accessing the network for normal operation.
  • the pre-configured mode prevents the RN from accessing the network to provide coverage services.
  • the technical problem to be solved by the present invention is to provide a method and system for a relay node to access a network, It enables the RN to access the network conveniently and quickly, and to carry out work smoothly.
  • the present invention provides a method for a relay node to access a network, including:
  • the RN In the initial access process, the RN carries the indication information of the RN in the message sent to the DeNB, and the DeNB selects the MME supporting the RN for the RN according to the indication information of the RN.
  • the method further includes:
  • the RN Before the RN sends a message to the DeNB, the RN selects the accessed cell according to the pre-configured base station list or the cell list, or selects the accessed cell according to the information included in the cell system broadcast message whether the relay node is allowed to access, The DeNB to which the selected access cell belongs initiates initial access.
  • the message that the RN sends to the DeNB to carry the indication information of the local RN includes: a radio resource control (RRC) connection establishment complete message, or an RRC connection request message.
  • RRC radio resource control
  • the step of the DeNB selecting the MME supporting the RN for the RN according to the indication information of the RN includes:
  • the DeNB After receiving the indication information of the RN, the DeNB configures a relay node specific parameter for the RN according to the information.
  • the method further includes:
  • the MME After the DeNB selects the MME for the RN, after the MME authenticates the RN, the MME selects a gateway located in the DeNB for the RN.
  • the indication information of the RN includes type information of the RN, or information about whether the RN specific parameter needs to be configured.
  • the type information includes information indicating that the RN is an inband relay or information indicating that the RN is an outband relay.
  • the type information when the type information includes information indicating that the RN is an in-band relay, the type information further includes information indicating that the RN is in-band resource partitioning or information indicating that the RN is in-band resource undivided.
  • the present invention also provides a relay node access system, the system including the RN and its associated
  • the RN is configured to: carry in a message sent to the DeNB in an initial access process With the indication information of the RN;
  • the DeNB is configured to: select, according to the indication information of the RN, an MME that supports the RN for the RN.
  • the RN includes a selection module and a sending module.
  • the selecting module is configured to: select an accessed cell according to a pre-configured base station list or a cell list, or select a cell to be accessed according to information about whether the relay node is allowed to be accessed in the cell system broadcast message;
  • the sending module is configured to: initiate initial access to the DeNB to which the cell selected by the selecting module belongs.
  • the DeNB includes a receiving module, a selecting module, and a configuration module.
  • the receiving module is configured to: receive indication information of the RN sent by the RN;
  • the selecting module is configured to: select, according to the information about the RN received by the receiving module, an MME that supports the RN for the RN;
  • the configuration module is configured to: configure a relay node specific parameter for the RN according to the indication information of the RN received by the receiving module.
  • the information of the RN includes type information of the RN, or information about whether the RN-specific parameter needs to be configured.
  • the base station is notified of the indication information of the RN when the RN establishes the RRC connection, so that the base station can select an appropriate MME for the RN, and solves the problem of how the base station learns the type information of the RN.
  • the invention has small changes to the protocol, and can enable the RN to smoothly access the network to carry out work.
  • FIG. 1 is a schematic structural diagram of a system for using a wireless relay technology in the prior art
  • FIG. 2 is a schematic flowchart of a RN accessing a network in the prior art
  • FIG. 3 is a schematic structural diagram of an access system according to an embodiment of the present invention.
  • the inventive concept of the present invention is: the RN carries the indication information of the RN in the message sent to the DeNB in the initial access process, and the DeNB selects the MME supporting the RN for the RN according to the indication information of the RN,
  • the indication information of the RN includes type information of the RN (also referred to as capability information of the RN, or hardware capability information of the RN), or information of whether the RN-specific parameter needs to be configured.
  • the initial access procedure herein refers to a process in which an RN establishes an RRC connection with a DeNB.
  • the DeNB can directly select the MME supporting the RN according to the information, and does not need to be limited to the pre-configuration as in the prior art, which is more convenient and flexible than the prior art. Ensure that the RN accesses the network quickly.
  • the RN selects the accessed cell according to the pre-configured base station list or the cell list, or selects whether to allow the relay node to access according to the information contained in the cell system broadcast message.
  • the cell initiates initial access to the DeNB to which the cell selected to access is located.
  • the message that the RN sends to the DeNB to carry the local RN indication information includes: an RRC connection setup complete message, or an RRC connection request message.
  • the DeNB After receiving the indication information of the RN, the DeNB configures a relay node specific parameter for the RN according to the indication information.
  • the MME After the DeNB selects the MME for the RN, after the MME authenticates the RN, the MME selects a gateway located in the DeNB for the RN.
  • the RNs have different types or capabilities. If the RN has more than one radio transceiver, the Un interface between the RN and the DeNB and the Uu interface between the RN and the UE may not use the same frequency.
  • the RN is called an outband RN, and sometimes The RN is called the RN of Type la; if the RN has only one radio transceiver, the Un interface between the RN and the DeNB and the Uu interface between the RN and the UE use the same frequency, the RN is called an in-band relay ( Inband RN ) , sometimes referred to as the RN of the Type 1 RN.
  • In-band relays can be classified into inbound RN with resource partitioning and in-band resources due to the different isolation of the RN radio transceiver. Not split Inbound RN without resource partitioning
  • the Un interface and the Uu interface need to be time-multiplexed, that is, the link between the Un interface and the Uu interface cannot be activated at the same time.
  • the type information includes information indicating that the RN is an in-band relay or information indicating that the RN is an out-of-band relay.
  • the type information may further include information indicating that the RN is an in-band resource partition or information indicating that the RN is an in-band resource.
  • the relay node access system implementing the above method includes a relay node (RN) and a host base station (DeNB) connected thereto, where:
  • the RN is configured to carry the indication information of the local RN in the message sent to the DeNB in the initial access process
  • the DeNB is configured to select, according to the indication information of the RN, a mobility management entity (MME) that supports the RN for the RN.
  • MME mobility management entity
  • the RN includes a selection module and a sending module, where:
  • the selecting module is configured to select a cell to be accessed according to the pre-configured base station list or the cell list, or select a cell to be accessed according to information about whether the relay node is allowed to be accessed in the cell system broadcast message;
  • the sending module is configured to initiate initial access to a DeNB to which the cell selected by the selecting module belongs.
  • the DeNB includes a receiving module, a selecting module, and a configuration module, where: the receiving module is configured to receive indication information sent by the RN;
  • the selecting module is configured to select, according to the information received by the receiving module, an MME that supports the RN for the RN;
  • the configuration module is configured to configure a relay node specific parameter for the RN according to the information received by the receiving module.
  • the indication information of the RN includes type information, or whether the RN-specific parameter needs to be configured. Information.
  • the MME that does not support the RN refers to the MME that cannot make the RN access the network; or the MME that cannot provide the relay function even if the RN accesses the network (such as a lower-level MME or no RN) MME for dedicated authentication and security mechanisms; or MME that cannot select a suitable gateway for the RN.
  • the RN is pre-configured with a list of DeNBs or cells that can be accessed. After the initial power-on of the RN, the process of accessing the network is as shown in Figure 4:
  • Step 401 The RN selects a cell with the best signal quality at a certain frequency point (belongs to the DeNB list or the cell list) according to the DeNB list or the cell list that can be accessed by the RN, acquires system information, initiates random access, and belongs to the cell.
  • the DeNB sends an RRC Connection Request (RRC Connection Request) message;
  • Step 402 The DeNB allocates resources for the RN, and sends an RRC connection setup (RRC) to the RN.
  • RRC RRC connection setup
  • Step 403 After receiving the RRC connection establishment, the RN sends an RRC Connection Setup Complete (RRC Connection Setup Complete) signaling to the DeNB, where the completion signaling includes type information of the RN, and the signaling further includes sending the RN to the signaling.
  • RRC Connection Setup Complete RRC Connection Setup Complete
  • NAS signaling of the core network such as an attach request
  • the type information of the RN includes information indicating that the RN is an in-band relay or information indicating that the RN is an out-of-band relay.
  • the type information may further include information indicating that the RN is an in-band resource partition or information indicating that the RN is an in-band resource.
  • the RN may also send its own type information to the DeNB in the RRC connection request in step 401.
  • Step 404 After receiving the RRC connection setup complete signaling, the DeNB selects an appropriate MME for the RN according to the type information of the RN carried by the DeNB. If the access is an ordinary user equipment, the DeNB selects an appropriate MME according to the load of the MME to which it is connected and the type of service initiated by the user equipment. When the RN accesses the network, the DeNB needs to select the MME supporting the RN. The selected MME needs to satisfy at least the following conditions: 1. The version of the MME is sufficient to support the information that the access node to which the core network is notified is the RN; The MME has the ability to select a suitable gateway for the RN, that is, a gateway located in the DeNB.
  • the MME selects a gateway on the core network side (not related to the base station to which the user equipment accesses) for the user equipment, but for the relay node, since the relay node needs to provide services for the user equipment under the coverage, If the MME selects the gateway on the core network side, the user data will be transmitted between multiple gateways, resulting in complicated data processing and increased data delay. Therefore, for the relay node, the MME needs to select a gateway located in the DeNB.
  • the DeNB After receiving the type information of the RN, the DeNB saves the type information of the RN and applies it to the parameter configuration of the RN.
  • Step 405 The DeNB sends an initial UE message (Initial UE Message) to the selected MME, where the NAS signaling, such as an attach request, is included;
  • Step 406 After receiving the initial UE message, the MME performs authentication and security establishment on the RN.
  • the MME also needs to implement information exchange with other network elements of the core network, and obtain subscription information of the RN from the Home Subscriber Server (HSS) (not shown in the drawing), and only the core network is authenticated as a relay node.
  • HSS Home Subscriber Server
  • the MME confirms the RN identity of the access.
  • the MME confirms that the access is a relay node, and the MME selects a gateway located in the DeNB for the RN, including the serving gateway SGW (Serving Gateway). ) and packet data network gateway PGW ( PDN Gateway );
  • Step 407 The MME sends an Initial Context Setup Request to the DeNB, where the QoS parameter of the data access bearer DRB that the DeNB needs to establish for the RN, security configuration parameters, and the like are included in the initial context establishment request.
  • the flag information of the relay node including the core network authentication confirmation, and the core network may set a specific parameter, such as a user profile identifier (SPID, Subscriber Profile ID), to identify the relay node;
  • SPID user profile identifier
  • Step 408 After receiving the initial context setup request, the DeNB confirms that the access is a relay node, establishes a DRB configuration parameter for the RN, and sends an RRC connection reconfiguration to the RN (RRC Connection Reconfiguration)
  • the DeNB can configure the relay node-specific parameters for the RN in the RRC connection reconfiguration, such as the relay for in-band resource partitioning, and the DeNB configures it for Un. Time slot information transmitted by the interface (ie, the interface between the DeNB and the RN).
  • Step 409 After receiving the RRC connection reconfiguration signaling, the RN applies the parameter configuration thereof, and sends an RRC Connection Reconfiguration Complete (RRC Connection Reconfiguration Complete) signaling to the DeNB.
  • RRC Connection Reconfiguration Complete RRC Connection Reconfiguration Complete
  • Step 410 After receiving the RRC connection reconfiguration, the DeNB sends an Initial Context Setup Response message to the MME.
  • the RN Since then, the RN has successfully accessed the network and established a DRB with the DeNB.
  • the RN can establish a connection with the O&M (Operation & Maintenance) server, and download necessary parameters such as the configuration information of the cell under the jurisdiction of the 0&M.
  • the RN will also be based on the established SRB (Signaling Radio Bearer) and the DRB and DeNB. Establish SI and X2 interfaces to provide services for user equipment covered by the RN.
  • the RN In order to work properly, the RN needs to access the appropriate DeNB and MME. This is mainly because the DeNB will configure dedicated parameters for the RN (different from ordinary user equipment), and establish a DRB for the RN to transmit the user equipment covered by the RN. S1 signaling, etc. (see step 408); The MME also needs to know that the accessing node is the RN when the RN is authenticated, and select the appropriate gateway located in the DeNB for the RN (see step 406).
  • the RN does not have a pre-configured list of DeNBs or cells that can be accessed.
  • the system message broadcasted in the cell contains information on whether the cell allows the relay node to access, and the RN selects a cell that can be accessed according to the broadcast information.
  • Step 501 The RN searches for a cell in its supported frequency band, selects a cell with the strongest signal quality at a certain frequency point and allows the relay node to access, reads a system message of the cell, and initiates random access in the cell.
  • the DeNB which is the base station to which the cell belongs, sends an RRC Connection Request (RRC Connection Request) message;
  • Steps 502 and 503 are the same as steps 402 and 403 in the first embodiment.
  • the type information of the RN included in the RRC connection setup complete signaling sent by the RN to the DeNB in step 503 indicates that the accessed RN is an inbound RN without resource partitioning;
  • Steps 504-510 are similar to steps 404-410 in the first embodiment, except that in step 507, since the DeNB learns that the RN is a trunk that does not divide the inband resource, the DeNB does not need to configure the RN for the Un interface transmission. Slot information, at which point the DeNB can transmit signaling and data with the RN at any time slot.
  • the DRB is established with the DeNB.
  • the RN can establish a connection with the O&M, and download the necessary parameters, such as the configuration information of the cell in the relay, from the O&M.
  • the RN also establishes S1 and X2 interfaces with the DeNB based on the established SRB and DRB, so as to provide the user equipment for the RN coverage. service.
  • the base station is notified of the indication information of the RN when the RN establishes the RRC connection, so that the base station can select an appropriate MME for the RN, and solve the problem of how the base station learns the RN information.
  • the invention has small changes to the protocol, and can enable the RN to smoothly access the network to carry out work.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

本发明公开了一种中继节点接入网络的方法和系统，该方法包括：中继节点（RN）在初始接入过程中，在向宿主基站（DeNB）发送的消息中携带本RN的指示信息，所述DeNB根据所述RN的指示信息为所述RN选择支持该RN的移动管理实体（MME）。本发明对协议改动较小，可以使RN顺利接入网络开展工作。

Description

一种中继节点接入网络的方法和系统
技术领域
本发明涉及移动通信领域， 尤其涉及一种中继节点接入网络的方法和系 统。 背景技术
第三代移动通信长期演进 ( LTE, Long Term Evolution ) 系统由演进的通 用陆地无线接入网 （E-UTRAN, Evolved Universal Terrestrial Radio Access Network ) 、 用户设备（UE, User Equipment ) 、 演进的分组核心网 （EPC, Evolved Packet Core )组成。 其中， E-UTRAN 由接入网网元的增强型基站 ( eNB )组成。 eNB通过 Uu接口与终端 UE连接， 通过 S1接口与核心网网 元如移动性管理实体 ( MME, Mobility Management Entity )连接。
为了满足日益增长的大带宽高速移动接入的需求， 第三代伙伴组织计划 ( 3GPP , Third Generation Partnership Projects ) 推出 高级长期演进 ( LTE- Advanced, Long-Term Evolution advance )标准。 ； LTE- Advanced对于 LTE系统的演进保留了 LTE的核心， 在此基础上釆用一系列技术对频域、 空 域进行扩充，以达到提高频谱利用率、增加系统容量等目的。无线中继（ Relay ) 技术即是 LTE-Advanced中的技术之一， 旨在扩展小区的覆盖范围，减少通信 中的死角地区， 平衡负载， 转移热点地区的业务， 节省 UE的发射功率。
如图 1所示， 中继节点（RN, Relay Node )通过 Uu接口与 UE连接， 提 供基站的功能。 此外， RN通过 Un接口与基站连接， 提供 UE的功能。 与 RN 连接的基站称为宿主基站（ DeNB, Donor eNB ) , DeNB通过 SI接口与核心 网网元如 MME连接。 RN通过 DeNB代理（ proxy )与核心网网元如 MME 保持连接。从而实现在 RN和基站之间、在 RN和其自身管理的 UE之间进行 数据传输的中继功能， 达到扩展小区的覆盖范围， 减少通信中的死角地区， 平衡负载， 转移热点地区的业务， 节省 UE的发射功率等目的。
RN为了实现中继功能，在接入 DeNB所辖小区建立无线资源控制（ RRC ) 连接后， 需要建立数据无线承载（DRB, Data Radio Bearer ) , 用于从操作与 维护（ 0&Μ, Operation & Maintenance )服务器下载必要的参数如 Relay所辖 小区的配置信息等， 传递 Relay所辖小区下 UE的 S1和 X2接口信令， 传递 Relay所辖小区下 UE的数据等等。 初始接入时 RN建立 DRB的完整流程如 图 2所示：
步骤 201 , RN与 DeNB建立 RRC连接之后 , 与 DeNB选择的 MME进 行非接入层（NAS, Non Access Stratum )信令交互， 完成标识信息的获取、 鉴权和安全建立 （ Security Setup ) ；
这里， NAS信令为 RN发起的附着 （Attach )请求。
步骤 202, MME与核心网的其他网元实现信息的交互， 如从归属用户服 务器（HSS, Home Subscriber Server )获得 RN的签约信息；
步骤 203 , MME与 DeNB进行 S1信令交互， 使得 DeNB获知向 DeNB 接入节点是 RN, 并获得 RN的上下文信息， 如 RN需要建立的无线接入承载 ( E-RAB, E-UTRAN Radio Access Bearer )的参数，安全密钥（ Security Key ) , UE的安全能力 （ UE Security Capabilities ) , 此处特指 RN的安全能力等。
步骤 204, DeNB为 RN建立数据无线承载。
为了在步骤 201中，使 RN接入合适的 DeNB和 MME, 现有技术中提出 釆用预配置的方式实现 DeNB和 MME的选择，这需要网络运营商提前为 RN 选定接入的 DeNB列表以及对应的 MME, 并把选定的这部分信息预先写入 RN设备中 , 当 RN初始上电后 ,依据预配置的信息选择 DeNB， 同时向 DeNB 提供 MME标识信息以便 DeNB选择合适的 MME。
然而由于网络的参数 (如 DeNB的标识、 负载， 或者 MME的负载）会 发生变化、 RN的部署场所会发生变化， 因此釆用这种预配置的方式很可能使 RN不能接入网络进行正常工作，特别当 RN由于紧急情况（如发生地震灾害 ) 需要尽快部署时， 预配置的方式使得 RN不能接入网络提供覆盖服务。 发明内容
本发明要解决的技术问题是提供一种中继节点接入网络的方法和系统， 能够使 RN方便、 快速的接入网络、 顺利开展工作。
为解决上述问题， 本发明提供了一种中继节点接入网络的方法， 包括：
RN在初始接入过程中，在向 DeNB发送的消息中携带本 RN的指示信息， 所述 DeNB才艮据所述 RN的指示信息为所述 RN选择支持该 RN的 MME。
所述方法还包括：
所述 RN在向 DeNB发送消息前， 根据预配置的基站列表或小区列表选 择接入的小区， 或者根据小区系统广播消息中包含的是否允许中继节点接入 的信息选择接入的小区，向所述选择接入的小区所属的 DeNB发起初始接入。
其中， 所述 RN向 DeNB发送的携带本 RN的指示信息的消息包括： 无 线资源控制 （RRC )连接建立完成消息， 或者 RRC连接请求消息。
其中， 所述 DeNB根据所述 RN的指示信息为所述 RN选择支持该 RN 的 MME的步骤包括：
所述 DeNB在收到所述 RN的指示信息后， 根据所述信息为所述 RN配 置中继节点专用参数。
所述方法还包括：
所述 DeNB为所述 RN选择 MME后 ,所述 MME在对所述 RN鉴权通过 后， 为所述 RN选择位于所述 DeNB内的网关。
其中，所述 RN的指示信息包括 RN的类型信息、或是否需要配置 RN专 用参数的信息。
其中， 所述类型信息包括指示 RN为带内中继的信息或指示本 RN为带 外中继的信息。
其中， 当所述类型信息包括指示 RN为带内中继的信息时， 所述类型信 息还包括指示该 RN为带内资源分割的信息或指示该 RN为带内资源不分割 的信息。
本发明还提供一种中继节点接入系统， 所述系统包括 RN和与其相连的
DeNB, 其中：
所述 RN设置为： 在初始接入过程中， 在向所述 DeNB发送的消息中携 带本 RN的指示信息；
所述 DeNB设置为：根据所述 RN的指示信息为所述 RN选择支持该 RN 的 MME。
其中， 所述 RN包括选择模块和发送模块，
所述选择模块设置为： 根据预配置的基站列表或小区列表选择接入的小 区， 或者根据小区系统广播消息中包含的是否允许中继节点接入的信息选择 接入的小区；
所述发送模块设置为： 向所述选择模块选择的小区所属的 DeNB发起初 始接入。
其中， 所述 DeNB包括接收模块， 选择模块和配置模块，
所述接收模块设置为： 接收所述 RN发送的 RN的指示信息；
所述选择模块设置为： 根据所述接收模块接收的 RN的信息为所述 RN 选择支持该 RN的 MME;
所述配置模块设置为： 根据所述接收模块接收的 RN的指示信息为所述 RN配置中继节点专用参数。
其中，所述 RN的信息包括 RN的类型信息、或是否需要配置 RN专用参 数的信息。
本发明中， 通过在 RN建立 RRC连接的阶段通知基站 RN的指示信息， 使得基站能够为 RN选择合适的 MME, 同时解决了基站如何获知 RN的类型 信息的问题。 本发明对协议改动较小， 可以使 RN顺利接入网络开展工作。 附图概述
图 1为现有技术中釆用无线中继技术的系统结构示意图；
图 2为现有技术中 RN接入网络的流程示意图；
图 3为本发明实施例接入系统结构示意图；
图 4为本发明实施例一的流程图。 本发明的较佳实施方式
本发明的发明构思是： RN在初始接入过程中，在向 DeNB发送的消息中 携带本 RN的指示信息，所述 DeNB根据所述 RN的指示信息为所述 RN选择 支持该 RN的 MME, RN的指示信息包括 RN的类型信息 （又称为 RN的能 力信息、 或 RN的硬件能力信息） 、 或是否需要配置 RN专用参数的信息。
此处的初始接入过程是指 RN与 DeNB建立 RRC连接的过程。
由于 RN主动向 DeNB发送了自己的指示信息， DeNB可根据该信息直 接为 RN选择支持 RN的 MME, 而不必像现有技术一样局限于预先的配置， 较现有技术更为方便、 灵活， 可以保证 RN快速接入网络。
优选地， 所述 RN在向 DeNB发送消息前， 先依据预配置的基站列表或 小区列表选择接入的小区， 或者依据小区系统广播消息中包含的是否允许中 继节点接入的信息选择接入的小区， 向所述选择接入的小区所属的 DeNB发 起初始接入。
优选地，所述 RN向 DeNB发送的携带本 RN指示信息的消息包括： RRC 连接建立完成消息， 或者 RRC连接请求消息。
所述 DeNB在收到所述 RN的指示信息后，根据所述指示信息为所述 RN 配置中继节点专用参数。
所述 DeNB为所述 RN选择 MME后 ,所述 MME在对所述 RN鉴权通过 后， 为所述 RN选择位于所述 DeNB内的网关。
依据 RN的硬件能力， 主要是 RN射频收发机的数量以及隔离度， RN具 有不同的类型或能力。如果 RN有一套以上的射频收发机， RN与 DeNB之间 的 Un接口和 RN与 UE之间的 Uu接口可以不使用相同的频率， 这种 RN称 为带外中继 （ Outband RN ) , 有时也称该 RN为 Type la的 RN; 如果 RN只 有一套射频收发机， RN与 DeNB之间的 Un接口和 RN与 UE之间的 Uu接 口使用相同的频率， 这种 RN称为带内中继 （ Inband RN ) , 有时也称该 RN 为 Type 1的 RN, 鉴于 RN射频收发机的隔离度不同， 带内中继可以分为带 内资源分割的中继（ Inbound RN with resource partitioning )和带内资源不分割 的中继（ Inbound RN without resource partitioning ) , 带内资源分割的中继是指
Un接口和 Uu接口需要釆用时分复用的方式， 即 Un接口和 Uu接口的链接 ( link ) 不能同时处于激活状态。
优选地， 所述类型信息包括指示 RN为带内中继的信息或指示本 RN为 带外中继的信息。 当所述类型信息包括指示 RN为带内中继的信息时， 所述 类型信息可进一步包括指示该 RN为带内资源分割的信息或指示该 RN为带 内资源不分割的信息。
实现上述方法的中继节点接入系统， 如图 3所示， 包括中继节点 （RN ) 和与其相连的宿主基站（DeNB ) , 其中：
所述 RN,用于在初始接入过程中，在向所述 DeNB发送的消息中携带本 RN的指示信息；
所述 DeNB,用于根据所述 RN的指示信息为所述 RN选择支持该 RN的 移动管理实体 ( MME ) 。
优选地， 所述 RN包括选择模块和发送模块， 其中：
所述选择模块，用于根据预配置的基站列表或小区列表选择接入的小区， 或者根据小区系统广播消息中包含的是否允许中继节点接入的信息选择接入 的小区；
所述发送模块， 用于向所述选择模块选择的小区所属的 DeNB发起初始 接入。
优选地， 所述 DeNB包括接收模块， 选择模块和配置模块， 其中： 所述接收模块， 用于接收所述 RN发送的指示信息；
所述选择模块， 用于根据所述接收模块接收的信息为所述 RN选择支持 该 RN的 MME;
所述配置模块， 用于根据所述接收模块接收的信息为所述 RN配置中继 节点专用参数。
优选地， RN的指示信息包括类型信息、或是否需要配置 RN专用参数的 信息。
以下结合附图和具体实施例对本发明进行进一步阐述。
在以下实施例中， 所述不支持 RN的 MME指无法使得 RN接入网络的 MME; 或者指即使 RN接入网络也无法提供中继功能的 MME (如版本较低 的 MME,或不提供 RN专用的鉴权和安全机制的 MME ) ; 或者指不能为 RN 选择合适网关的 MME。
实施例一
RN预配置了可以接入的 DeNB列表或小区列表。 RN在初始上电后， 接 入网络的流程如图 4所示：
步骤 401 , RN依据可以接入的 DeNB列表或小区列表， RN选择某个频 点上信号质量最好的小区 （属于 DeNB列表或小区列表） ， 获取系统信息， 发起随机接入， 向该小区所属的 DeNB发送 RRC连接请求（ RRC Connection Request ) 消息；
步骤 402, DeNB为 RN分配资源， 向 RN发送 RRC连接建立 （RRC
Connection Setup ) 消息；
步骤 403 , RN收到 RRC连接建立后， 向 DeNB发送 RRC连接建立完成 ( RRC Connection Setup Complete )信令， 在该完成信令中包含 RN的类型信 息； 同时在该信令中还包含 RN发送给核心网的 NAS信令如附着请求；
为了实现本发明， 需要在 RRC连接建立完成中新增信元表示 RN的类型 信息， RN的类型信息包括指示 RN为带内中继的信息或指示本 RN为带外中 继的信息。 当所述类型信息包括指示 RN为带内中继的信息时， 所述类型信 息可进一步包括指示该 RN为带内资源分割的信息或指示该 RN为带内资源 不分割的信息。
在其他实施例中， RN也可以在步骤 401中的 RRC连接请求中将自己的 类型信息发送给 DeNB。
步骤 404, DeNB收到 RRC连接建立完成信令后， 根据其携带的 RN的 类型信息， 为 RN选择合适的 MME; 如果接入的是普通的用户设备， DeNB根据其所连接的 MME的负载、以 及用户设备发起的业务类型选择合适的 MME。 但当 RN接入网络时， DeNB 需要选择支持 RN的 MME,选择的 MME至少需要满足以下条件： 1、该 MME 的版本足以支持其获知核心网向其通知的接入节点为 RN的信息； 2、该 MME 有能力为 RN选择合适的网关即位于 DeNB内的网关。 通常用户设备在发起 业务时， MME 为用户设备选择核心网侧的网关 （与用户设备接入的基站无 关）， 但对于中继节点， 由于中继节点需要为其覆盖下的用户设备提供服务， MME如果选择核心网侧的网关将使得用户数据在多个网关间传输，导致数据 处理复杂以及数据时延增加， 因此对于中继节点， MME需要选择位于 DeNB 内的网关。
DeNB收到 RN的类型信息后保存该 RN的类型信息， 将其应用于对该 RN的参数配置中。
步骤 405 , DeNB向选择的 MME发送初始 UE消息（ Initial UE Message ) , 其中包含 NAS信令如附着请求；
步骤 406, MME收到初始 UE消息后， 对该 RN进行鉴权和安全建立，
MME还需要与核心网的其他网元实现信息的交互，从归属用户服务器（HSS, Home Subscriber Server )获得 RN的签约信息（附图未示出）， 只有在核心网 鉴权为中继节点并通知 MME时， MME才确认接入的 RN身份，本实施例中 , 经过鉴权， MME确认接入的是中继节点， MME为该 RN选择位于 DeNB内 的网关，包括服务网关 SGW( Serving Gateway )和分组数据网网关 PGW( PDN Gateway ) ；
如何选择合适的网关可釆用现有技术实现。
步骤 407, MME向 DeNB发送初始上下文建立请求（ Initial Context Setup Request )，其中包含 DeNB需要为 RN建立的数据接入承载 DRB的服务质量 参数、 安全配置的参数等； 在初始上下文建立请求中， 还包括核心网鉴权确 认的中继节点的标志信息， 核心网可以设置特定的参数如用户配置标识 ( SPID , Subscriber Profile ID )来标识中继节点；
步骤 408, DeNB收到初始上下文建立请求后， 确认接入的是中继节点， 为该 RN建立 DRB配置参数， 向 RN发送 RRC连接重配置（ RRC Connection Reconfiguration )信令；
由于 DeNB在步骤 403中获得了 RN的类型信息，因此 DeNB可以在 RRC 连接重配置中为该 RN配置中继节点专用的参数， 如对于带内资源分割的中 继 , DeNB为其配置用于 Un接口 （即 DeNB与 RN之间的接口 )传输的时隙 信息。
步骤 409 , RN收到 RRC连接重配置信令后， 应用其中的参数配置， 向 DeNB发送 RRC连接重配置完成 ( RRC Connection Reconfiguration Complete ) 信令；
步骤 410 , DeNB收到 RRC连接重配置完成后， 向 MME发送初始上下 文建立响应 ( Initial Context Setup Response ) 消息；
自此， RN顺利接入网络， 与 DeNB建立了 DRB。 RN能够与操作与维护 ( O&M, Operation & Maintenance )服务器建立连接， 从 0&M下载必要的参 数如 Relay所辖小区的配置信息等， RN还将基于已建立的 SRB ( Signaling Radio Bearer )和 DRB与 DeNB建立 SI和 X2接口， 以便为 RN覆盖下的用 户设备提供服务。
RN为了能够正常工作， 需要接入合适的 DeNB和 MME, 这主要体现在 DeNB将为 RN配置专用参数（有别于普通的用户设备） ， 以及为 RN建立 DRB用于传输 RN覆盖下用户设备的 S1信令等（见步骤 408 ) ； MME也需 要在 RN的鉴权时获知接入的节点是 RN, 以及为 RN选择合适的位于 DeNB 内的网关 （见步骤 406 ) 。
实施例二
本实施例中， RN没有预配置的可以接入的 DeNB列表或小区列表。在小 区广播的系统消息中包含该小区是否允许中继节点接入的信息， RN根据广播 的信息选择可以接入的小区。
步骤 501 , RN搜索其支持频带内的小区， 选择某个频点上信号质量最强 的并且允许中继节点接入的小区， 读取该小区的系统消息， 在该小区发起随 机接入， 向该小区所属的基站即 DeNB发送 RRC连接请求（ RRC Connection Request ) 消息； 步骤 502、 503与实施例一中的步骤 402、 403相同。 在本实施例中， 步 骤 503中 RN向 DeNB发送的 RRC连接建立完成信令包含的 RN的类型信息 表明接入的 RN 是带内资源不分割的中继 （Inbound RN without resource partitioning ) ；
步骤 504— 510与实施例一中的步骤 404— 410类似，只是在步骤 507中， 由于 DeNB获知 RN是带内资源不分割的中继， 因此 DeNB不需要为该 RN 配置用于 Un接口传输的时隙信息，此时 DeNB可以在任何时隙与 RN进行信 令和数据的传输。
RN顺利接入网络后，与 DeNB建立了 DRB。 RN能够与 O&M建立连接， 从 0&M下载必要的参数如 Relay所辖小区的配置信息等， RN还将基于已建 立的 SRB和 DRB与 DeNB建立 S1和 X2接口， 以便为 RN覆盖下的用户设 备提供服务。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 所述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保护 范围， 凡在本发明的精神和原则之内所作的任何修改、 等同替换和改进等， 均应包含在本发明的保护范围之内。
工业实用性
本发明中， 通过在 RN建立 RRC连接的阶段通知基站 RN的指示信息， 使得基站能够为 RN选择合适的 MME, 同时解决了基站如何获知 RN信息的 问题。 本发明对协议改动较小， 可以使 RN顺利接入网络开展工作。

Claims

权 利 要 求 书
1、 一种中继节点接入网络的方法， 该方法包括：
中继节点 （RN )在初始接入过程中， 在向宿主基站（DeNB )发送的消 息中携带本 RN的指示信息，所述 DeNB根据所述 RN的指示信息为所述 RN 选择支持该 RN的移动管理实体（ MME ) 。
2、 如权利要求 1所述的方法， 所述方法还包括：
所述 RN在向 DeNB发送消息前， 根据预配置的基站列表或小区列表选 择接入的小区， 或者根据小区系统广播消息中包含的是否允许中继节点接入 的信息选择接入的小区，向所述选择接入的小区所属的 DeNB发起初始接入。
3、 如权利要求 1所述的方法， 其中，
所述 RN向 DeNB发送的携带本 RN的指示信息的消息包括： 无线资源 控制 （RRC )连接建立完成消息， 或者 RRC连接请求消息。
4、 如权利要求 1所述的方法， 其中， 所述 DeNB根据所述 RN的指示信 息为所述 RN选择支持该 RN的 MME的步骤包括：
所述 DeNB在收到所述 RN的指示信息后， 根据所述信息为所述 RN配 置中继节点专用参数。
5、 如权利要求 1所述的方法， 所述方法还包括：
所述 DeNB为所述 RN选择 MME后 ,所述 MME在对所述 RN鉴权通过 后， 为所述 RN选择位于所述 DeNB内的网关。
6、 如权利要求 1-5中任一项所述的方法， 其中， 所述 RN的指示信息包 括 RN的类型信息、 或是否需要配置 RN专用参数的信息。
7、 如权利要求 6中任一项所述的方法， 其中，
所述类型信息包括指示 RN为带内中继的信息或指示本 RN为带外中继 的信息。
8、 如权利要求 7所述的方法， 其中，
当所述类型信息包括指示 RN为带内中继的信息时， 所述类型信息还包 括指示该 RN为带内资源分割的信息或指示该 RN为带内资源不分割的信息。
9、 一种中继节点接入系统， 所述系统包括中继节点 （RN )和与其相连 的宿主基站（DeNB ) , 其中：
所述 RN设置为： 在初始接入过程中， 在向所述 DeNB发送的消息中携 带本 RN的指示信息；
所述 DeNB设置为：根据所述 RN的指示信息为所述 RN选择支持该 RN 的移动管理实体（MME ) 。
10、 如权利要求 9所述的系统， 其中， 所述 RN包括选择模块和发送模 块，
所述选择模块设置为： 根据预配置的基站列表或小区列表选择接入的小 区， 或者根据小区系统广播消息中包含的是否允许中继节点接入的信息选择 接入的小区；
所述发送模块设置为： 向所述选择模块选择的小区所属的 DeNB发起初 始接入。
11、 如权利要求 9所述的系统， 其中， 所述 DeNB包括接收模块， 选择 模块和配置模块，
所述接收模块设置为： 接收所述 RN发送的 RN的指示信息；
所述选择模块设置为： 根据所述接收模块接收的 RN的信息为所述 RN 选择支持该 RN的 MME;
所述配置模块设置为： 根据所述接收模块接收的 RN的指示信息为所述 RN配置中继节点专用参数。
12、 如权利要求 9-11所述的系统， 其中， 所述 RN的信息包括 RN的类 型信息、 或是否需要配置 RN专用参数的信息。
PCT/CN2011/070496 2010-07-30 2011-01-21 一种中继节点接入网络的方法和系统 WO2012013026A1 (zh)

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