WO2012142824A1 - 小区切换方法及系统 - Google Patents

小区切换方法及系统 Download PDF

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Publication number
WO2012142824A1
WO2012142824A1 PCT/CN2011/081977 CN2011081977W WO2012142824A1 WO 2012142824 A1 WO2012142824 A1 WO 2012142824A1 CN 2011081977 W CN2011081977 W CN 2011081977W WO 2012142824 A1 WO2012142824 A1 WO 2012142824A1
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WO
WIPO (PCT)
Prior art keywords
handover
base station
configuration information
source base
cell
Prior art date
Application number
PCT/CN2011/081977
Other languages
English (en)
French (fr)
Inventor
陈琳
陈思
奚进
翟恒星
Original Assignee
中兴通讯股份有限公司
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Publication date
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
Publication of WO2012142824A1 publication Critical patent/WO2012142824A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/16Discovering, processing access restriction or access information
    • 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 the field of communications, and in particular to a cell handover method and system. BACKGROUND OF THE INVENTION In order to meet the growing demand for large bandwidth and high speed mobile access, the third generation partner organization plan (Third)
  • LTE-Advanced Long-Term Evolution Advance
  • LTE-Advanced retains the core of LTE for the evolution of Long-Term Evolution (LTE).
  • LTE-Advanced retains the core of LTE for the evolution of Long-Term Evolution (LTE).
  • LTE-Advanced retains the core of LTE for the evolution of Long-Term Evolution (LTE).
  • LTE-Advanced retains the core of LTE for the evolution of Long-Term Evolution (LTE).
  • LTE-Advanced retains the core of LTE for the evolution of Long-Term Evolution (LTE).
  • LTE Long-Term Evolution
  • Wireless Relay technology one of the technologies in LTE-Advanced, aims to extend the coverage of cells, reduce dead zones in communications, balance load, transfer services in hotspots, and save user equipment (User Equipment, referred to as UE) transmit power.
  • UE User Equipment
  • the RN provides functions and services similar to those of the ordinary base station eNB for the UE accessing the cell, and the wireless interface between the two is called an Access Link, which is also called a Uu interface.
  • a relay node accesses an e B serving it in a manner similar to a normal UE through a radio interface, and an eNB serving the RN is referred to as a donor base station Donor eNB, referred to as De B.
  • the radio interface between RN and De B is called "Backhaul Link", also known as Un port. According to whether the center frequency used by the RN in the Un port and the Uu port is the same, the RN can be divided into two modes: "inband” and "outband".
  • Inband Relay means that the RN uses the same frequency in the Un port and the U U port.
  • the Outband Relay means that the RN uses different frequencies in the Un port and the Uu port.
  • the first type of relay Typel Relay and the second type of relay Type2 Relay are defined according to whether they have their own independent cells or as part of the DeNB.
  • Typel Relay means that the RN can create its own independent cells. These cells have their own physical cell identifier (Physical Cell ID, PCI for short). The RN works like a base station in its own cell, such as sending reference signals and scheduling the UE. Etc.; Type2 Relay does not have its own independent cell and PCI, but only assists the DeNB for data transmission.
  • the standard also defines "Type la" and "Type lb" Relay. Similar to the Type 1 Relay, they all have independent cells and PCI, and also independently transmit and receive control signals.
  • EUTRAN Evolved Universal Terrestrial Radio Access Network
  • ECGI Evolved Universal Terrestrial Radio Access Network
  • the RN Orthogonal Administration and Maintenance, OAM.
  • the process of configuring the ECGI after the RN is switched includes the following steps: Step S201: In the handover preparation process, the source base station sends a handover request to the target base station.
  • the target base station After receiving the handover request, the target base station performs access control according to the QoS parameters included in the handover request, and allows the handover of the UE to allocate resources for the UE when the resource is allowed.
  • the target base station sends a handover request acknowledgement to the source base station, including the allocated resource information.
  • the QoS (Quality of Service) parameter of the radio access bearer (E-RAB, E-UTRAN Radio Access Bearer) established by the UE is included in the handover request.
  • Step S202 in a handover execution process, the source base station sends a handover command to the UE.
  • the UE obtains synchronization with the target cell, initiates random access in the target cell, and sends handover complete signaling to the target base station. At this point, the UE switches to the target cell.
  • Step S203 In the process of handover completion, the source base station, the target base station, and the core network element jointly ensure step S204, and the RN downloads configuration information, including ECGI, from the OAM of the RN.
  • Step S205 the RN establishes an S1/X2 connection with the target base station.
  • the RN broadcasts the configuration information downloaded in step 204, and allows the UE to access the relay cell.
  • the connected UE of the cell under the jurisdiction of the RN may fail to communicate with the relay cell and the radio link fails (Radio Link Failure (RLF), or switch to another cell before the RN handover.
  • RLF Radio Link Failure
  • the connected state UE of the cell under the RN may not be able to synchronize with the relay cell, the radio link fails the RLF, or the switch to another cell before the RN handover, and no effective solution has been proposed yet.
  • the present invention provides a cell handover method and system, so that the RN can establish a new relay cell as soon as possible, and avoid the problem that the UE of the relay cell fails due to reconstruction failure or handover failure.
  • a cell handover method including: before a relay node (RN) performs handover, a source base station obtains configuration information of the RN; and a configuration in which the source base station carries the RN Signaling of the information is sent to the RN.
  • the source base station obtains configuration information of the RN according to the following steps: the target base station sends configuration information of the RN to the source base station; and the source base station obtains configuration information of the RN.
  • the target base station sends the configuration information of the RN to the source base station, including: when the handover is an X2 handover, the target base station uses the handover request acknowledgement message to configure configuration information of the RN.
  • the target base station sends the configuration information of the RN to the source base station, including: when the handover is an S1 handover, the target base station uses the handover request acknowledgement message to configure configuration information of the RN.
  • the source base station sends signaling that carries configuration information of the RN to the RN, including: the source base station uses a radio resource control (RRC) connection reconfiguration message or an RN-specific reconfiguration message The configuration information of the RN is sent to the RN.
  • RRC radio resource control
  • the configuration information of the RN includes at least one of the following: a cell identifier of a relay; a tracking area code of a relay cell; a base station identifier of the RN; and a flow control transmission protocol established by the RN to establish an S1/X2 interface connection ( SCTP) Address.
  • SCTP S1/X2 interface connection
  • the method further includes: when the handover is an X2 handover, the source base station sends a handover request message to the target base station, where the handover request message is Carrying the indication that the handover node is the information of the RN; when the handover is an S1 handover, the source base station sends a handover request message to the MME, where the handover request message carries the indication that the handover node is the RN.
  • the MME sends a handover request message to the target base station, where the handover request message carries information indicating that the handover node is the RN.
  • the information indicating that the handover node is the RN includes at least one of the following: an identifier of the RN, a type of the RN, a handover reason dedicated to the RN, and a radio access carrying S1/X2 signaling.
  • a cell handover system including a source base station and a relay node (RN): the source base station is configured to obtain configuration information of the RN before the RN performs handover; The signaling carrying the configuration information of the RN is sent to the RN; and the RN is configured to receive the signaling that carries the configuration information of the RN.
  • the system further includes a target base station, configured to send signaling carrying the configuration information of the RN to the RN.
  • the target base station is further configured to send configuration information of the RN to the source base station by using the handover request acknowledgement message when the handover is an X2 handover.
  • the system further includes a mobility management entity (MME): the target base station is further configured to: when the handover is an S1 handover, send, by using the handover request acknowledgement message, configuration information of the RN to the The MME is configured to send configuration information of the RN to the source base station by using a handover command message.
  • MME mobility management entity
  • the source base station is further configured to send configuration information of the RN to the RN by using a Radio Resource Control Protocol (RRC) connection reconfiguration message or an RN-specific reconfiguration message.
  • RRC Radio Resource Control Protocol
  • the source base station is further configured to: when the handover is an X2 handover, send a handover request message to the target base station, where the handover request message carries information indicating that the handover node is the RN;
  • the source base station sends a handover request message to the MME, where the handover request message carries information indicating that the handover node is the RN; and the MME sends a handover request message to the target.
  • the base station the handover request message carries information indicating that the handover node is the RN.
  • the source base station obtains configuration information of the RN and sends signaling of the configuration information carrying the RN to the RN.
  • the RN can acquire relevant configuration information during the preparation process of the cell handover, so that the RN can newly create or update the cell, shortening the time that the relay cell UE cannot synchronize with the relay cell, and avoiding the UE. RLF occurs.
  • FIG. 1 is a schematic diagram of a network structure using a wireless relay technology according to the related art
  • FIG. 2 is a schematic diagram of establishing a new relay cell by an X2 handover RN according to the related art
  • FIG. 3 is a cell according to an embodiment of the present invention
  • FIG. 4 is a flowchart of Embodiment 1 according to an embodiment of the present invention
  • FIG. 5 is a flowchart of Embodiment 2 according to an embodiment of the present invention
  • FIG. 6 is a cell handover according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a second structure of a cell switching system according to an embodiment of the present invention
  • FIG. 8 is a third structural diagram of a cell switching system according to an embodiment of the present invention.
  • the embodiment of the present invention provides a cell handover method, so that the RN can establish a new relay cell as soon as possible, and avoid the data transmission failure of the UE in the relay cell due to the reconfiguration failure or the handover failure.
  • the method includes the following steps: Step S302: Before the relay node RN performs handover, the source base station obtains configuration information of the RN. Step S304: The source base station sends signaling of the configuration information of the RN to the RN. In the embodiment of the present invention, before the relay node RN performs handover, the source base station obtains configuration information of the RN and sends signaling of the configuration information carrying the RN to the RN.
  • the RN can acquire relevant configuration information during the preparation process of the cell handover, so that the RN can newly create or update the cell, shortening the time that the relay cell UE cannot synchronize with the relay cell, and avoiding the UE.
  • RLF occurs.
  • the method provided by the embodiment of the present invention is not used, there may be a large number of UEs simultaneously causing re-establishment signaling congestion caused by re-establishment signaling congestion, or a large number of UEs simultaneously switching to cause handover failure caused by handover signaling congestion, which greatly affects data transmission of the UE.
  • the method provided by the embodiment of the present invention does not need to switch the UE to other cells, and ensures data transmission of the UE of the relay cell.
  • a new relay cell can be established as soon as possible, and the UE of the relay cell is prevented from failing due to reconstruction failure or handover failure.
  • the source base station may obtain configuration information of the RN in multiple ways, for example, obtain configuration information of the RN from one or several specified network entities in the network, Preferably, the configuration information of the RN is sent by the target base station to the source base station.
  • the target base station sends the signaling carrying the configuration information of the relay node RN to the source base station. Since the interface type between the target base station and the source base station is different, the generated RN switching manner is also different. The manner in which the target base station sends the signaling carrying the configuration information of the relay node RN is also different. For example, when switching to the X2 interface, the target base station sends the configuration information of the RN to the source base station by using a handover request acknowledgement message (HANDOVER REQUEST ACKNOWLEDGE).
  • HANDOVER REQUEST ACKNOWLEDGE a handover request acknowledgement message
  • the target base station transmits the configuration information of the RN to the mobility management entity MME by using a handover request acknowledgement message (HANDOVER REQUEST ACKNOWLEDGE), and the MME configures the RN by using a handover command message (HANDOVER COMMAND) Information is sent to the source base station.
  • HANDOVER REQUEST ACKNOWLEDGE a handover request acknowledgement message
  • HANDOVER COMMAND handover command message
  • the source base station may use a radio resource control protocol (RRC, Radio Resource Control) to connect to the reconfiguration message (RRC Connection Reconfiguration) or the RN.
  • RRC Radio Resource Control
  • the reconfiguration message (RN Reconfiguration) sends the configuration information of the RN to the RN.
  • the configuration information of the RN may include at least one of the following: a cell identifier of the relay cell, such as a Cellularity, an ECGI, a Tracking Area Code (TAC) of the relay cell, and a base station identifier (eNB ID) of the RN;
  • a cell identifier of the relay cell such as a Cellularity, an ECGI, a Tracking Area Code (TAC) of the relay cell, and a base station identifier (eNB ID) of the RN;
  • the RN establishes the Stream Control Transmission Protocol (SCTP) address of the S1/X2 connection.
  • SCTP Stream Control Transmission Protocol
  • the configuration information of the RN may also include other information, and is not limited to the several listed.
  • the source base station before the source base station obtains the configuration information of the RN, according to different handover types, the signaling sent by the source base station is different, and the destination entity for sending signaling is also different, for example, when switching to X2 handover, the source base station The handover request message needs to be sent to the target base station, where the handover request message carries information indicating that the handover node is the RN, to determine that the handover between the target base station and the source base station is about to be performed; correspondingly, if the handover is S1 handover, the source base station sends the handover.
  • the request message to the MME, in the handover request message carries the information that the handover node is the RN, and the MME sends the handover request message to the target base station, and also carries the information that the handover node is the RN in the handover request message.
  • the information indicating that the handover node is an RN includes at least one of the following: an identifier of the RN; a type of the RN;
  • the radio access bearer carrying the S1/X2 signaling bears the identity of the E-RAB.
  • the basic idea of the cell handover method provided by the embodiment of the present invention is as follows: In the handover preparation process, if the target base station handover preparation is successful, the target base station sends dedicated signaling carrying the configuration information of the relay node to Source base station. In addition, the source base station sends dedicated signaling carrying the configuration information of the relay node to the relay node.
  • the invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.
  • Embodiment 1 This embodiment describes a scenario of X2 handover, see FIG.
  • Step S401 The source base station sends a handover request (HANDOVER REQUEST) message to the target base station, where the information indicating that the handover node is the RN is carried.
  • the information indicating that the handover node is an RN refers to at least one of the following: an identifier of the RN.
  • the type of RN Includes one of the following: inband trunking, outband trunking; Fixed (relay), mobile (mobile) trunk; type 1 (Type l) trunk, type la (Type la) trunk, type lb (Type lb) trunk, type 2 (Type 2) trunk; Un subframe configuration is required, Un subframe configuration is not required; RN-specific handover cause (Cause); E-RAB identifier carrying S1/X2 signaling.
  • Step S402 After receiving the handover request, the target base station allows the relay node to access, and sends a handover request acknowledgement message to the source base station, where the configuration information of the relay node is carried.
  • the configuration information of the relay node includes at least one of the following: a cell identifier of the relay cell, such as a Cellularity, an ECGI, and a Tracking Area Code (TAC) of the relay cell;
  • a cell identifier of the relay cell such as a Cellularity, an ECGI, and a Tracking Area Code (TAC) of the relay cell;
  • TAC Tracking Area Code
  • Base station identifier eNB ID of the RN
  • the RN establishes the SCTP address of the S1/X2 connection.
  • the configuration information of the relay node may be directly transmitted through the handover request acknowledgement message, or may be delivered by a container in the handover request acknowledgement message (such as Target e B To Source e B Transparent Container).
  • Step S403 The source base station receives the handover request acknowledgement message, and forwards the configuration information of the relay node carried therein to the relay node.
  • the source base station is notified to the relay node by using dedicated signaling (such as an RRC Connection Reconfiguration message, or an RN Reconfiguration (RN Reconfiguration) message) carrying the configuration information of the relay node.
  • dedicated signaling such as an RRC Connection Reconfiguration message, or an RN Reconfiguration (RN Reconfiguration) message
  • the cell handover method provided by the embodiment of the present invention can enable the relay node to obtain configuration information in advance, thereby newly creating or updating a cell, and shortening the relay cell UE cannot be replaced with the relay cell. Synchronization time, avoiding RLF of the UE; also, it is not necessary to switch the UE to other cells, and ensure data transmission of the UE of the relay cell.
  • the method that the target base station knows that the handover node is the relay node is not limited to the information that the handover request message carries the relay node in the handover request message mentioned in step S401, for example, In the process of load balancing, the source base station notifies the target base station of the node information of the relay node in the cell under the jurisdiction, and details are not described herein again.
  • Embodiment 2 This embodiment describes a scenario of S1 handover. For the processing flow, refer to FIG. 5.
  • Step S501 The source base station sends a handover request (HANDOVER REQUIRED) message to the MME, where the information indicating that the handover node is a relay node (RN) is carried.
  • the information indicating that the handover node is an RN refers to at least one of the following: an identifier of the RN.
  • the type of RN Includes one of the following: inband trunking, outband trunking; fixed trunking, mobile trunking; type 1 (Type l) trunking, type la (Type la) Relay, Type lb (Type lb) trunk, Type 2 (Type 2) trunk; Un subframe configuration required, Un subframe configuration not required;
  • Step S502 The MME receives the handover request message, and sends a corresponding handover request (HANDOVER REQUEST) message to the target base station.
  • the handover request message carries information indicating that the handover node is a relay node.
  • a container such as Source to Target Transparent Container
  • Step S503 After receiving the handover request, the target base station allows the relay node to access, and the target base station sends a handover request acknowledgement (HANDOVER REQUEST ACKNOWLEDGE) message to the MME, where the relay section is carried. Point configuration information. Further, the MME sends a handover command (HANDOVER COMMAND) message to the source base station, and forwards the configuration information of the relay node to the source base station.
  • the configuration information of the relay node includes at least one of the following: a cell identifier of the relay cell, such as a Cellularity, an ECGI, and a Tracking Area Code (TAC) of the relay cell;
  • Step S504 The source base station receives the handover command message, and forwards the configuration information of the relay node carried in the relay node to the relay node.
  • the source base station performs dedicated signaling (eg, RRC connection reconfiguration (RRC) carrying configuration information of the relay node.
  • dedicated signaling eg, RRC connection reconfiguration (RRC) carrying configuration information of the relay node.
  • the Connection Reconfiguration message or RN-specific Reconfiguration (RN Reconfiguration) message, is notified to the relay node.
  • the cell handover method provided by the embodiment of the present invention can enable the relay node to obtain configuration information in advance, thereby newly creating or updating a cell, and shortening the relay cell UE cannot be replaced with the relay cell. Synchronization time, avoiding RLF of the UE; also, it is not necessary to switch the UE to other cells, and ensure data transmission of the UE of the relay cell.
  • an embodiment of the present invention provides a cell handover system. The schematic diagram of the structure is as shown in FIG.
  • a source base station 601 and an RN 602 may include a source base station 601 and an RN 602 connected in sequence: a source base station 601, which is set before the RN 602 performs handover. Obtaining configuration information of the RN 602; and transmitting signaling of the configuration information carrying the RN 602 to the RN 602;
  • the RN 602 is configured to receive signaling carrying configuration information of the RN 602.
  • the system may further include a target base station 701, which is connected to the source base station 601, and configured to send signaling of the configuration information carrying the RN 602 to the RN 602.
  • the target base station 701 is further configured to send the configuration information of the RN 602 to the source base station 601 by using a handover request acknowledgement message when switching to the X2 handover.
  • a handover request acknowledgement message when switching to the X2 handover.
  • the system may further include an MME 801, one end is connected to the source base station 601, and one end is connected to the target base station 701: the target base station 701 is further configured to use the handover request to confirm when switching to the S1 handover.
  • the message sends the configuration information of the RN 602 to the MME 801; the MME 801 is arranged to transmit the configuration information of the RN 602 to the source base station 601 using a handover command message.
  • the source base station 601 is further configured to send configuration information of the RN 602 to the RN 602 using an RRC Connection Reconfiguration message or a RN 602 dedicated reconfiguration message.
  • the source base station 601 is further configured to: when the handover is an X2 handover, send a handover request message to the target base station 701, where the handover request message carries information indicating that the handover node is the RN 602;
  • the source base station 601 sends a handover request message to the MME 801, where the handover request message carries information indicating that the handover node is the RN 602;
  • the MME 801 sends a handover request message to the target base station 701, where the handover request message carries the indication handover node. Is the information of RN 602.
  • the present invention achieves the following technical effects:
  • the source base station obtains the configuration information of the RN and carries the configuration information of the RN. Order to send to the RN.
  • the RN can acquire relevant configuration information during the preparation process of the cell handover, so that the RN can newly create or update the cell, shortening the time that the relay cell UE cannot synchronize with the relay cell, and avoiding the UE. RLF occurs.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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Description

小区切换方法及系统 技术领域 本发明涉及通信领域, 具体而言, 涉及一种小区切换方法及系统。 背景技术 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 (Third
Generation Partnership Projects, 简称 3GPP) 推出高级长期演进 (Long-Term Evolution Advance , 简称 LTE- Advanced ) 标准。 LTE- Advanced 对于长期演进 (Long-Term Evolution, 简称 LTE) 的演进保留了 LTE的核心, 并在此基础上采用一系列技术对频 域、 空域进行了扩充, 以达到提高频谱利用率、 增加系统容量等目的。 无线中继 (Wireless Relay) 技术即 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和节省用户设 备 (User Equipment, 简称 UE) 的发射功率。 如图 1所示, RN对接入其小区的 UE 提供与普通基站 eNB类似的功能和服务,两者间的无线接口称为 "接入链路" (Access Link), 也称为 Uu 接口。 中继节点 (Relay Node, RN) 通过无线接口以类似于普通 UE的方式接入一个服务于它的 e B, 服务于 RN的 eNB称之为施主基站 Donor eNB, 简称 De B。 RN与 De B间的无线接口称为 "回传链路"(Backhaul Link), 也称为 Un口。 根据 RN在 Un口与 Uu口使用的中心频率是否相同,可将 RN分为"带内" (Inband) 禾口 "带外"(Outband) 两种工作模式。 Inband Relay指的是 RN在 Un口禾 P Uu口使用 相同的频率, Outband Relay是指 RN在 Un口和 Uu口使用不同的频率。 对于 Inband Relay, 根据其是拥有自己的独立小区, 还是作为 DeNB下小区的一 部分, 分别定义了第一种类型的中继 Typel Relay和第二种类型的中继 Type2 Relay。 Typel Relay是指 RN能够创建属于自己的独立小区, 这些小区拥有自己的物理小区标 识 (Physical Cell ID, 简称 PCI), RN在自己的小区内像基站一样工作, 如发送参考信 号, 对 UE进行调度等; 而 Type2 Relay没有自己独立的小区和 PCI, 只是辅助 DeNB 进行数据传输。除了 Type 1 Relay以夕卜,标准中还定义了" Type la"禾口" Type lb"Relay。 它们与 Type 1 Relay类似, 都有独立的小区和 PCI, 也独立进行控制信号的收发和调 度。 以演进全球陆地无线接入网络 (EUTRAN, Evolved Universal Terrestrial Radio Access Network) 为例, Relay小区的小区全局标识 (E-UTRAN Cell Global Identifier, ECGI) 由 RN的网管(Operation Administration and Maintenance, OAM)配置。 RN切 换后配置 ECGI的流程如图 2所示, 包括以下步骤: 步骤 S201 , 在切换准备 (Handover Preparation) 过程中, 源基站向目标基站发送 切换请求。目标基站收到切换请求后,依据切换请求中包含的 QoS参数执行接入控制, 在资源允许的情况下, 允许该 UE的切换, 为该 UE分配资源。 目标基站向源基站发 送切换请求确认, 包含分配的资源信息。 这里,源基站和目标基站之间存在 X2接口。在切换请求中包含 UE建立的无线接 入承载(E-RAB, E-UTRAN Radio Access Bearer)的服务质量(QoS, Quality of Service) 参数。 步骤 S202, 在切换执行(Handover Execution)过程中, 源基站向 UE发送切换命 令。 UE取得与目标小区的同步, 在目标小区发起随机接入, 向目标基站发送切换完成 信令, 至此, UE切换到目标小区。 步骤 S203 , 在切换完成 (Handover Competion) 过程中, 源基站、 目标基站以及 核心网网元共同保证 步骤 S204, RN从 RN的 OAM下载配置信息, 其中包括 ECGI等。 步骤 S205, RN与目标基站建立 S1/X2连接。 步骤 S206, RN广播步骤 204中下载的配置信息, 允许 UE接入该 relay小区。 通过以上步骤的分析可见, 当 RN切换时, RN所辖小区的连接态 UE可能由于无 法与 relay小区同步而无线链路失败(Radio Link Failure, 简称 RLF), 或者在 RN切换 之前切换到其他小区。 针对相关技术中当 RN切换时, RN所辖小区的连接态 UE可能由于无法与 relay 小区同步而无线链路失败 RLF, 或者在 RN切换之前切换到其他小区的问题, 目前尚 未提出有效的解决方案。 发明内容 本发明提出了一种小区切换方法及系统, 使得 RN能够尽快建立新的 relay小区, 避免 relay小区的 UE由于重建失败或者切换失败导致数据传输失败的问题。 根据本发明的一个方面, 提供了一种小区切换方法, 包括: 在中继节点 (RN)执 行切换之前, 源基站获得所述 RN的配置信息; 以及所述源基站将携带所述 RN的配 置信息的信令发送至所述 RN。 优选的, 所述源基站按如下步骤获得所述 RN的配置信息: 所述目标基站将所述 RN的配置信息发送至所述源基站; 所述源基站获得所述 RN的配置信息。 优选的, 所述目标基站将所述 RN的配置信息发送至所述源基站, 包括: 当所述 切换是 X2切换时, 所述目标基站利用所述切换请求确认消息将所述 RN的配置信息 发送至所述源基站。 优选的, 所述目标基站将所述 RN的配置信息发送至所述源基站, 包括: 当所述 切换是 S1切换时,所述目标基站利用所述切换请求确认消息将所述 RN的配置信息发 送至移动性管理实体 (MME); 所述 MME利用切换命令消息将所述 RN的配置信息 发送至所述源基站。 优选的, 所述源基站将携带所述 RN的配置信息的信令发送至所述 RN, 包括: 所 述源基站利用无线资源控制 (RRC) 连接重配置消息或者 RN专用的重配置消息将所 述 RN的配置信息发送至所述 RN。 优选的, 所述 RN的配置信息包括下列至少之一: 中继(relay) 小区的小区标识; relay小区的跟踪区域码; RN的基站标识; RN建立 S1/X2接口连接的流控制传输协议 ( SCTP) 地址。 优选的, 所述源基站获得所述 RN的配置信息之前, 还包括: 当所述切换是 X2切换时, 所述源基站发送切换请求消息至所述目标基站, 其中, 所述切换请求消息中携带指示切换节点是所述 RN的信息; 当所述切换是 S 1切换时, 所述源基站发送切换要求消息至所述 MME, 其中, 所述切换要求消息中携带指示切 换节点是所述 RN的信息; 所述 MME发送切换请求消息至所述目标基站, 所述切换 请求消息中携带指示切换节点是所述 RN的信息。 优选的, 所述指示切换节点是所述 RN的信息包括下列至少之一: 所述 RN的标 识;所述 RN的类型;所述 RN专用的切换原因;承载 S1/X2信令的无线接入承载 (E-RAB) 的标识。 根据本发明的另一方面,提供了一种小区切换系统,包括源基站和中继节点(RN): 所述源基站, 设置为在 RN执行切换之前, 获得所述 RN的配置信息; 以及将携带所 述 RN的配置信息的信令发送至所述 RN; 所述 RN, 设置为接收所述携带所述 RN的 配置信息的信令。 优选的, 所述系统还包括目标基站, 设置为将携带所述 RN的配置信息的信令发 送至所述 RN。 优选的, 所述目标基站还设置为当所述切换为 X2切换时, 利用所述切换请求确 认消息将所述 RN的配置信息发送至所述源基站。 优选的, 所述系统还包括移动性管理实体 (MME): 所述目标基站还设置为当所 述切换为 S1 切换时, 利用所述切换请求确认消息将所述 RN的配置信息发送至所述 MME; 所述 MME, 设置为利用切换命令消息将所述 RN的配置信息发送至所述源基 站。 优选的, 所述源基站还设置为利用无线资源控制协议 (RRC) 连接重配置消息或 者 RN专用的重配置消息将所述 RN的配置信息发送至所述 RN。 优选的, 所述源基站还设置为当所述切换是 X2切换时, 发送切换请求消息至所 述目标基站, 其中, 所述切换请求消息中携带指示切换节点是所述 RN的信息; 当所 述切换是 S1切换时, 所述源基站发送切换要求消息至所述 MME, 其中, 所述切换要 求消息中携带指示切换节点是所述 RN的信息; 所述 MME发送切换请求消息至所述 目标基站, 所述切换请求消息中携带指示切换节点是所述 RN的信息。 在本发明实施例中, 在中继节点 RN执行切换之前, 源基站获得 RN的配置信息 并将携带 RN的配置信息的信令发送至 RN。 δΡ, 在本发明实施例中, 在小区切换的准 备过程中, RN即可以获取相关的配置信息, 从而 RN能够提前新建或更新小区, 缩短 了 relay小区 UE无法与 relay小区同步的时间, 避免 UE发生 RLF。 附图说明 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是根据相关技术的利用无线中继技术的网络结构示意图; 图 2是根据相关技术的 X2切换 RN建立新的 relay小区的示意图; 图 3是根据本发明实施例的小区切换方法的处理流程图; 图 4是根据本发明实施例的实施例一的流程图; 图 5是根据本发明实施例的实施例二的流程图; 图 6是根据本发明实施例的小区切换系统的第一种结构示意图; 图 7是根据本发明实施例的小区切换系统的第二种结构示意图; 图 8是根据本发明实施例的小区切换系统的第三种结构示意图。 具体实施方式 相关技术中提到, 当 RN切换时, RN所辖小区的连接态 UE可能由于无法与 relay 小区同步而 RLF, 或者在 RN切换之前切换到其他小区。 为解决上述技术问题, 本发明实施例提供了一种小区切换方法, 使得 RN能够尽 快建立新的 relay小区, 避免 relay小区的 UE由于重建失败或者切换失败导致数据传 输失败, 其处理流程如图 3所示, 包括: 步骤 S302、 在中继节点 RN执行切换之前, 源基站获得 RN的配置信息; 步骤 S304、 源基站将携带 RN的配置信息的信令发送至 RN。 在本发明实施例中, 在中继节点 RN执行切换之前, 源基站获得 RN的配置信息 并将携带 RN的配置信息的信令发送至 RN。 δΡ, 在本发明实施例中, 在小区切换的准 备过程中, RN即可以获取相关的配置信息, 从而 RN能够提前新建或更新小区, 缩短 了 relay小区 UE无法与 relay小区同步的时间, 避免 UE发生 RLF。 另外, 若不采用本发明实施例提供的方法, 可能存在大量 UE同时 RLF造成重建 信令拥塞导致重建失败, 或者大量 UE同时切换造成切换信令拥塞造成切换失败, 大 大影响了 UE的数据传输。 采用本发明实施例提供的方法, 不需要将 UE切换到其他 小区, 保证 relay小区的 UE的数据传输。 BP , 采用本发明实施例提供的方法, 能够尽快建立新的 relay小区, 避免 relay小 区的 UE由于重建失败或者切换失败导致数据传输失败。 实施时, 如图 3所示流程, 步骤 S302在实施时, 源基站可以通过多种途径获得 RN的配置信息,例如,从网络中的一个或若干个指定的网络实体中获取 RN的配置信 息, 优选的, 由目标基站将 RN的配置信息发送至源基站。 在本发明实施例中, 目标基站发送携带中继节点 RN的配置信息的信令至源基站, 由于目标基站与源基站间的接口类型不同, 因此产生的 RN的切换方式也不同, 相应 的, 目标基站发送携带中继节点 RN的配置信息的信令的方式也不相同, 例如, 当切 换为 X2 接口时, 目标基站利用切换请求确认消息 ( HANDOVER REQUEST ACKNOWLEDGE) 将 RN的配置信息发送至源基站; 再例如, 当切换为 S1切换时, 目标基站利用切换请求确认消息 (HANDOVER REQUEST ACKNOWLEDGE) 将 RN 的配置信息发送至移动性管理实体 MME, 由 MME利用切换命令消息 (HANDOVER COMMAND) 将 RN的配置信息发送至源基站。 在本发明实施例中, 如图 3所示流程, 步骤 S304在实施时, 优选的, 源基站可以 利用无线资源控制协议 (RRC, Radio Resource Control ) 连接重配置消息 (RRC Connection Reconfiguration) 或者 RN专用的重配置消息 (RN Reconfiguration) 将 RN 的配置信息发送至 RN。 实施时, RN的配置信息可以包括下列至少之一: relay小区的小区标识, 如 Cellldentity、 ECGI; relay小区的跟踪区域码 ( Tracking AreaCode, 简称 TAC); RN的基站标识 (eNB ID);
RN 建立 S1/X2 连接的流控制传输协议 (SCTP, Stream Control Transmission Protocol) 地址。 实际应用中, RN的配置信息还可能包括其他信息, 并不仅限于已列举的几种。 在本发明实施例中, 源基站获得 RN的配置信息之前, 根据切换类型的不同, 源 基站发送的信令不同, 发送信令的目的实体也不同, 例如, 当切换为 X2切换时, 源 基站需要发送切换请求消息至目标基站, 其中, 切换请求消息中携带指示切换节点是 RN的信息, 以确定目标基站与源基站间即将进行切换; 相应的, 若切换为 S1切换, 则源基站发送切换要求消息至 MME, 在切换要求消息中携带切换节点是 RN的信息, MME发送切换请求消息至目标基站,同样在切换请求消息中携带切换节点是 RN的信 息。 其中, 指示切换节点是 RN的信息, 包括下列至少之一: RN的标识; RN的类型;
RN专用的切换原因; 承载 S1/X2信令的无线接入承载 E-RAB的标识。 由上述技术方案可以获知, 本发明实施例提供的小区切换方法的基本思想是: 在 切换准备过程中, 若目标基站切换准备成功, 则目标基站发送携带中继节点的配置信 息的专用信令给源基站。 另外, 源基站发送携带所述中继节点的配置信息的专用信令 给中继节点。 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是, 在不冲突的 情况下, 本申请中的实施例及实施例中的特征可以相互组合。 实施例一 本实施例描述的是 X2切换的场景, 参见图 4。 步骤 S401 : 源基站发送切换请求 (HANDOVER REQUEST) 消息给目标基站, 其中携带指示切换节点是 RN的信息。 指示切换节点是 RN的信息指的是以下至少之一: RN的标识。 RN的类型。 包括以下之一: 带内 (inband) 中继、 带外 (outband) 中继; 固定 (fixed) 中继、 移动 (mobile) 中继; 类型 1 ( Type l ) 中继、 类型 la ( Type la) 中继、 类型 lb ( Type lb) 中继、 类型 2 ( Type 2) 中继; 需要 Un子帧配置、 不需要 Un子帧配置; RN专用的切换原因 (Cause); 承载 S1/X2信令的 E-RAB的标识。 步骤 S402: 目标基站收到切换请求后, 允许中继节点接入, 向源基站发送切换请 求确认消息, 其中携带中继节点的配置信息。 中继节点的配置信息包括以下至少之一: relay小区的小区标识, 如 Cellldentity、 ECGI; relay小区的跟踪区域码 ( Tracking AreaCode, 简称 TAC);
RN的基站标识 (eNB ID);
RN建立 S1/X2连接的 SCTP地址。 中继节点的配置信息可以是直接通过切换请求确认消息传递的, 也可以是通过切 换请求确认消息中的容器(如 Target e B To Source e B Transparent Container )传递的。 步骤 S403 : 源基站收到切换请求确认消息, 将其中携带的中继节点的配置信息转 发给中继节点。 其中,源基站通过携带中继节点的配置信息的专用信令 (如 RRC连接重配置 (RRC Connection Reconfiguration) 消息, 或 RN专用的重配置 (RN Reconfiguration) 消息) 通知给中继节点。 由此可见, 相比于背景技术中介绍的方法, 采用本发明实施例提供小区切换方法 可以使得中继节点提前获得配置信息, 从而提前新建或更新的小区,缩短了 relay小区 UE无法与 relay小区同步的时间, 避免 UE发生 RLF; 另外也不需要将 UE切换到其 他的小区, 保证 relay小区的 UE的数据传输。 需要说明的是, 在本实施例中, 由于目标基站已知切换节点是中继节点的方法不 限于步骤 S401中提到的通过切换请求消息中携带指示切换节点是中继节点的信息,例 如还可以是负载均衡的过程中, 源基站将所辖小区内是中继节点的节点信息通知给目 标基站, 在此不再一一赘述。 实施例二 本实施例描述的是 S1切换的场景, 处理流程参见图 5。 步骤 S501 : 源基站发送切换要求 (HANDOVER REQUIRED) 消息给 MME, 其 中携带指示切换节点是中继节点 (RN) 的信息。 指示切换节点是 RN的信息指的是以下至少之一: RN的标识。
RN的类型。 包括以下之一: 带内 (inband) 中继、 带外 (outband) 中继; 固定 (fixed) 中继、 移动 (mobile) 中继; 类型 1 ( Type l ) 中继、 类型 la ( Type la) 中继、 类型 lb ( Type lb) 中继、 类型 2 ( Type 2) 中继; 需要 Un子帧配置、 不需要 Un子帧配置;
RN专用的切换原因 (Cause); 承载 S1/X2信令的 E-RAB的标识。 步骤 S502 : MME 收到切换要求消息, 发送相应的切换请求 (HANDOVER REQUEST) 消息给目标基站。 切换请求消息中携带指示切换节点是中继节点的信息。 在此过程中, 若指示切换节点是中继节点的信息是通过容器 (如 Source to Target Transparent Container)传递的, 那么由于 MME不解析容器内的信息, MME只是将容 器内的信息直接转发给目标基站。 步骤 S503 : 目标基站收到切换请求后, 允许中继节点接入, 目标基站向 MME发 送切换请求确认(HANDOVER REQUEST ACKNOWLEDGE)消息, 其中携带中继节 点的配置信息。 进一步地, MME发送切换命令 (HANDOVER COMMAND) 消息给 源基站, 将中继节点的配置信息转发给源基站。 中继节点的配置信息包括以下至少之一: relay小区的小区标识, 如 Cellldentity、 ECGI; relay小区的跟踪区域码 ( Tracking AreaCode, 简称 TAC);
RN的基站标识 (eNB ID); RN建立 S1/X2连接的 SCTP地址。 步骤 S504, 源基站收到切换命令消息, 将其中携带的中继节点的配置信息转发给 中继节点。 其中,源基站通过携带中继节点的配置信息的专用信令 (如 RRC连接重配置 (RRC
Connection Reconfiguration) 消息, 或 RN专用的重配置 (RN Reconfiguration) 消息) 通知给中继节点。 由此可见, 相比于背景技术中介绍的方法, 采用本发明实施例提供小区切换方法 可以使得中继节点提前获得配置信息, 从而提前新建或更新的小区,缩短了 relay小区 UE无法与 relay小区同步的时间, 避免 UE发生 RLF; 另外也不需要将 UE切换到其 他的小区, 保证 relay小区的 UE的数据传输。 基于同一发明构思, 本发明实施例提供了一种小区切换系统, 其结构示意图如图 6所示, 可以包括依次相连的源基站 601及 RN 602: 源基站 601, 设置为在 RN 602执行切换之前, 获得 RN 602的配置信息; 以及将 携带 RN 602的配置信息的信令发送至 RN 602;
RN 602, 设置为接收携带 RN 602的配置信息的信令。 在一个实施例中, 优选的, 如图 7所示, 系统还可以包括目标基站 701, 与源基 站 601相连, 设置为将携带 RN 602的配置信息的信令发送至 RN 602。 在一个实施例中, 优选的, 目标基站 701还设置为当切换为 X2切换时, 利用切 换请求确认消息将 RN 602的配置信息发送至源基站 601。 在一个实施例中, 如图 8所示, 系统还可以包括 MME 801, 一端与源基站 601相 连, 一端与目标基站 701相连: 目标基站 701还设置为当切换为 S1切换时, 利用切换请求确认消息将 RN 602的 配置信息发送至 MME 801 ; MME 801, 设置为利用切换命令消息将 RN 602的配置信息发送至源基站 601。 在一个实施例中, 优选的, 源基站 601还设置为利用 RRC连接重配置消息或者 RN 602专用的重配置消息将 RN 602的配置信息发送至 RN 602。 在一个实施例中, 优选的, 源基站 601还设置为当切换是 X2切换时, 发送切换 请求消息至目标基站 701,其中,切换请求消息中携带指示切换节点是 RN 602的信息; 当切换是 S1切换时, 源基站 601发送切换要求消息至 MME 801, 其中, 切换要 求消息中携带指示切换节点是 RN 602的信息; MME 801发送切换请求消息至目标基 站 701, 切换请求消息中携带指示切换节点是 RN 602的信息。 从以上的描述中, 可以看出, 本发明实现了如下技术效果: 在本发明实施例中, 在中继节点 RN执行切换之前, 源基站获得 RN的配置信息 并将携带 RN的配置信息的信令发送至 RN。 δΡ, 在本发明实施例中, 在小区切换的准 备过程中, RN即可以获取相关的配置信息, 从而 RN能够提前新建或更新小区, 缩短 了 relay小区 UE无法与 relay小区同步的时间, 避免 UE发生 RLF。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布在多个计算装置所 组成的网络上, 可选地, 它们可以用计算装置可执行的程序代码来实现, 从而, 可以 将它们存储在存储装置中由计算装置来执行, 并且在某些情况下, 可以以不同于此处 的顺序执行所示出或描述的步骤, 或者将它们分别制作成各个集成电路模块, 或者将 它们中的多个模块或步骤制作成单个集成电路模块来实现。 这样, 本发明不限制于任 何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已, 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保护范围之内。

Claims

权 利 要 求 书
1. 一种小区切换方法, 包括:
在中继节点 RN执行切换之前, 源基站获得所述 RN的配置信息; 以及 所述源基站将携带所述 RN的配置信息的信令发送至所述 RN。
2. 根据权利要求 1所述的方法, 其中, 所述源基站按如下步骤获得所述 RN的配 置信息:
所述目标基站将所述 RN的配置信息发送至所述源基站;
所述源基站获得所述 RN的配置信息。
3. 根据权利要求 2所述的方法, 其中, 所述目标基站将所述 RN的配置信息发送 至所述源基站, 包括: 当所述切换是 X2切换时, 所述目标基站利用所述切换 请求确认消息将所述 RN的配置信息发送至所述源基站。
4. 根据权利要求 2所述的方法, 其中, 所述目标基站将所述 RN的配置信息发送 至所述源基站, 包括:
当所述切换是 S1 切换时, 所述目标基站利用所述切换请求确认消息将所 述 RN的配置信息发送至移动性管理实体 MME;
所述 MME利用切换命令消息将所述 RN的配置信息发送至所述源基站。
5. 根据权利要求 1所述的方法, 其中, 所述源基站将携带所述 RN的配置信息的 信令发送至所述 RN, 包括: 所述源基站利用无线资源控制 RRC连接重配置消 息或者 RN专用的重配置消息将所述 RN的配置信息发送至所述 RN。
6. 根据权利要求 1至 5任一项所述的方法, 其中, 所述 RN的配置信息包括下列 至少之一:
中继 relay小区的小区标识;
relay小区的跟踪区域码;
RN的基站标识;
RN建立 S1/X2接口连接的流控制传输协议 SCTP地址。
7. 根据权利要求 6所述的方法, 其中, 所述源基站获得所述 RN的配置信息之前, 还包括:
当所述切换是 X2切换时,所述源基站发送切换请求消息至所述目标基站, 其中, 所述切换请求消息中携带指示切换节点是所述 RN的信息;
当所述切换是 S1切换时, 所述源基站发送切换要求消息至所述 MME, 其 中, 所述切换要求消息中携带指示切换节点是所述 RN的信息;
所述 MME发送切换请求消息至所述目标基站, 所述切换请求消息中携带 指示切换节点是所述 RN的信息。
8. 根据权利要求 7所述的方法, 其中, 所述指示切换节点是所述 RN的信息包括 下列至少之一:
所述 RN的标识;
所述 RN的类型;
所述 RN专用的切换原因;
承载 S1/X2信令的无线接入承载 E-RAB的标识。
9. 一种小区切换系统, 包括源基站和中继节点 RN:
所述源基站, 设置为在中继节点 RN执行切换之前, 获得所述 RN的配置 信息; 以及将携带所述 RN的配置信息的信令发送至所述 RN;
所述 RN, 设置为接收所述携带所述 RN的配置信息的信令。
10. 根据权利要求 9所述的系统, 其中, 所述系统还包括目标基站, 设置为将携带 所述 RN的配置信息的信令发送至所述 RN。
11. 根据权利要求 10所述的系统, 其中, 所述目标基站还设置为当所述切换为 X2 切换时,利用所述切换请求确认消息将所述 RN的配置信息发送至所述源基站。
12. 根据权利要求 10所述的系统, 其中, 所述系统还包括移动性管理实体 MME: 所述目标基站还设置为当所述切换为 S1 切换时, 利用所述切换请求确认 消息将所述 RN的配置信息发送至所述 MME;
所述 MME, 设置为利用切换命令消息将所述 RN的配置信息发送至所述 源基站。
13. 根据权利要求 9所述的系统, 其中, 所述源基站还设置为利用无线资源控制协 议 RRC连接重配置消息或者 RN专用的重配置消息将所述 RN的配置信息发送 至所述 RN。
14. 根据权利要求 9至 13任一项所述的系统,其中,所述源基站还设置为当所述切 换是 X2切换时, 发送切换请求消息至所述目标基站, 其中, 所述切换请求消 息中携带指示切换节点是所述 RN的信息;
当所述切换是 S1切换时, 所述源基站发送切换要求消息至所述 MME, 其 中, 所述切换要求消息中携带指示切换节点是所述 RN的信息; 所述 MME发 送切换请求消息至所述目标基站, 所述切换请求消息中携带指示切换节点是所 述 RN的信息。
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