WO2011000161A1

WO2011000161A1 - Handover method and device

Info

Publication number: WO2011000161A1
Application number: PCT/CN2009/072594
Authority: WO
Inventors: 张亮亮; 常俊仁; 李亚娟; 李婷
Original assignee: 华为技术有限公司
Priority date: 2009-07-02
Filing date: 2009-07-02
Publication date: 2011-01-06
Also published as: CN102187706B; CN102187706A

Abstract

A handover method and a device are provided. The method involves: upon learning a relay station requires a network handover, a serving base station negotiates with a target base station to determine whether physical cell identifier (PCID) conflicts might exist, assigns a new PCID to the relay station and instructs the relay station to switch to the target base station by using the new PCID. The present invention identifies in advance and avoids PCID conflicts, thereby avoiding network handover interference.

Description

一种切换方法和装置技术领域 Switching method and device

本发明涉及无线通信领域技术，尤其是一种切换方法和装置。背景技术 The present invention relates to the field of wireless communication technologies, and in particular, to a handover method and apparatus. Background technique

为了提高小区边缘用户的数据吞吐量，同时也为了扩大小区覆盖面积，在 3GPP LTE-ADVANCED***目前已经引入中继（ Relay Node )节点，中继节点包含固定中继，游牧中继和移动中继。 In order to improve the data throughput of the cell edge users and also to expand the cell coverage area, a relay node has been introduced in the 3GPP LTE-ADVANCED system, and the relay node includes a fixed relay, a nomadic relay, and a mobile relay. .

对于 LTE-ADVANCED***，每个基站 eNB (演进型 NodeB )或者中继站 RN ( relay node , 中继节点 ) 都需要一个物理小区标示 PCID ( hysical-layer cell ID ), 通过发送 PCID用于保证各自下属终端 UE ( User Equipment用户设备) 下行同步。 PCID 由 PSS ( rimary synchronization signal )和 SSS ( secondary synchronization signal )构成。在 LTE-ADVANCED 中一共有 504 PCID供使用。由于中继的引入使得 PCID的需求大增，存在 PCID复用的可能。 For the LTE-ADVANCED system, each base station eNB (evolved NodeB) or relay station RN (relay node) needs a physical cell identifier (PCID) to transmit the PCID (hysical-layer cell ID). UE (User Equipment User Equipment) downlink synchronization. The PCID consists of a PSS (rimary synchronization signal) and a SSS (secondary synchronization signal). A total of 504 PCIDs are available for use in LTE-ADVANCED. Due to the introduction of relays, the demand for PCID is greatly increased, and there is a possibility of multiplexing PCID.

移动中继站从一个服务小区移动到另外一个小区的情况下，可能与另外小区中的中继站出现 PCID冲突。 In the case where the mobile relay station moves from one serving cell to another, there may be a PCID collision with the relay station in the other cell.

发明内容 Summary of the invention

本发明实施例提供一种切换方法和***，以优化网络切换流程，提高效率。 Embodiments of the present invention provide a handover method and system to optimize a network handover procedure and improve efficiency.

根据本发明的一实施例，提供一种切换方法，包括： According to an embodiment of the invention, a handover method is provided, including:

获得中继站需要切换到目标基站的决定； Obtaining the decision that the relay station needs to switch to the target base station;

向目标基站发送切换请求，该切换请求中包含协商消息，用于与目标基站协商是否会存在 PCID冲突； Sending a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the target base station whether there is a PCID conflict;

接收目标基站的切换响应，该切换请求响应中包含响应协商消息生成的 PCID列表，所述 PCID列表包含至少一个 PCID; Receiving a handover response of the target base station, where the handover request response includes a PCID list generated by the response negotiation message, where the PCID list includes at least one PCID;

根据 PCID列表为中继站分配一个新 PCID, 并向中继站发送 PCID更改消息，该 PCID更改消息中包含新 PCID, 用于通知中继站使用新 PCID 切换到目标基站中。 Assign a new PCID to the relay according to the PCID list, and send the PCID to the relay station. The message is changed, and the PCID change message includes a new PCID for instructing the relay station to switch to the target base station using the new PCID.

根据本发明的另一实施例，提供一种基站，包括： According to another embodiment of the present invention, a base station is provided, including:

切换确定单元：用于获得中继站需要切换到目标基站的决定；发送单元，用于向目标基站发送切换请求，该切换请求中包含协商消息，用于与服务基站协商是否会存在 PCID冲突； a handover determining unit: configured to obtain a decision that the relay station needs to be handed over to the target base station; the sending unit, configured to send a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the serving base station whether there is a PCID conflict;

接收单元，用于接收目标基站的切换响应，该切换请求响应中包含响应协商消息生成的 PCID列表，所述 PCID列表包含至少一个 PCID; a receiving unit, configured to receive a handover response of the target base station, where the handover request response includes a PCID list generated by the response negotiation message, where the PCID list includes at least one PCID;

分配单元，用于根据 PCID列表为中继站分配一个新 PCID; An allocating unit, configured to allocate a new PCID to the relay station according to the PCID list;

通知单元，用于向中继站发送 PCID更改消息，该 PCID更改消息中包含新 PCID, 用于通知中继站使用新 PCID切换到目标基站中。本发明一个实施例在中继站切换到目标基站前，服务基站通过与目标基站协商确认可能存在 PCID冲突，服务基站为中继站分配一个新的 PCID, 指示中继站启用新的 PCID切换到目标基站上，能够提前识别并避免 PCID 冲突，避免网络切换中的干扰。附图说明 The notification unit is configured to send a PCID change message to the relay station, where the PCID change message includes a new PCID, and is used to notify the relay station to switch to the target base station by using the new PCID. In an embodiment of the present invention, before the relay station switches to the target base station, the serving base station confirms that there may be a PCID conflict by negotiating with the target base station, and the serving base station allocates a new PCID to the relay station, instructing the relay station to enable the new PCID to be handed over to the target base station, which can be advanced. Identify and avoid PCID conflicts and avoid interference in network switching. DRAWINGS

图 1为本发明提供的切换方法一个实施例的流程示意图； 1 is a schematic flowchart of an embodiment of a handover method provided by the present invention;

图 2为本发明提供的切换方法另一个实施例的的流程示意图；图 3为本发明中继站通知下属终端利用新 PCID接入该中继站一个实施例的流程示意图； 2 is a schematic flowchart of another embodiment of a handover method provided by the present invention; FIG. 3 is a schematic flowchart of an embodiment of a relay station informing a subordinate terminal to access the relay station by using a new PCID;

图 4为本发明提供的切换方法另一个实施例的的流程示意图；图 5为本发明提供的切换方法另一个实施例的的流程示意图；图 6为本发明中继站通知下属终端利用新 PCID接入该中继站另一个实施例的流程示意图； 4 is a schematic flowchart of another embodiment of a handover method according to the present invention; FIG. 5 is a schematic flowchart of another embodiment of a handover method according to the present invention; FIG. 6 is a relay station of the present invention notifying a subordinate terminal to access by using a new PCID. A schematic flowchart of another embodiment of the relay station;

图 7为本发明中继站通知下属终端利用新 PCID接入该中继站另一个实施例的流程示意图； 7 is a schematic flow chart of another embodiment of a relay station informing a subordinate terminal to access the relay station by using a new PCID;

图 8为本发明中继站通知下属终端利用新 PCID接入该中继站另一个实施例的流程示意图； 8 is a relay station of the present invention notifying a subordinate terminal to access the relay station by using a new PCID. Schematic diagram of the process of the example;

图 9为本发明实施例提供的基站一个实施例的结构示意图； FIG. 9 is a schematic structural diagram of an embodiment of a base station according to an embodiment of the present disclosure;

图 10为切换确定单元一个实施例的结构示意图； 10 is a schematic structural diagram of an embodiment of a handover determining unit;

图 11为切换确定单元另一个实施例的结构示意图； 11 is a schematic structural diagram of another embodiment of a handover determining unit;

图 12为本发明实施例提供的基站另一个实施例的结构示意图。具体实施方式 FIG. 12 is a schematic structural diagram of another embodiment of a base station according to an embodiment of the present invention. detailed description

下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。 The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

包含中继站的 LTE- Advance***中，每个基站管理归属于其小区的多个中继站 RN, 每个中继站管理归属于其的多个终端 UE。 ***分别为每个 eNB和中继站分配相应的 PCID, 基站定期发送自己的 PCID, 使得基站下属的中继站或者终端通过该 PCID 与之下行同步；中继站定期发送自己的 PCID,使得中继站下属的终端通过该 PCID与之下行同步。由于 PCID的数量有限，存在 PCID复用的需要，不同小区间的中继站可能分别由各自归属的基站分配相同的 PCID, 同一个小区内基站也可能在相隔较远的中继站分配相同的 PCID。当位于第一小区的移动中继移动到第二小区时，移动中继的原 PCID可能与第二小区中的某个中继站的 PCID相同，两者之间会相互干扰，导致各自下属有可能接收另外中继站的同步信号。同样的，当一个中继站在小区范围内移动时，也可能出现与邻近的中继站 PCID相同的情况。一旦出现这种 PCID冲突的情况，则需要一个中继站改变其 PCID。 In an LTE-Advance system including a relay station, each base station manages a plurality of relay stations RNs belonging to its cell, each of which manages a plurality of terminal UEs belonging thereto. The system assigns a corresponding PCID to each eNB and the relay station, and the base station periodically sends its own PCID, so that the relay station or terminal subordinate to the base station synchronizes with the lower line through the PCID; the relay station periodically sends its own PCID, so that the terminal subordinate to the relay station passes the PCID. Synchronize with the next line. Due to the limited number of PCIDs, there is a need for PCID multiplexing. Relay stations between different cells may be assigned the same PCID by their respective base stations, and base stations in the same cell may also allocate the same PCID at distant stations. When the mobile relay located in the first cell moves to the second cell, the original PCID of the mobile relay may be the same as the PCID of a certain relay station in the second cell, and the two may interfere with each other, so that the respective subordinates may receive the same. In addition, the synchronization signal of the relay station. Similarly, when a relay station moves within the cell range, the same situation as the neighboring relay station PCID may occur. In the event of such a PCID collision, a relay station is required to change its PCID.

本发明的第一实施例提供一种切换方法，用于在网路切换时提前识别并解决网络中的标识冲突。在获知中继站需要进行网络切换时，中继站的服务基站 eNBl首先确认中继站切换到目标基站中是否会存在 PCID冲突；如果可能存在 PCID冲突，则服务基站 eNBl需要为切换中继站分配一个新的 PCID；中继站在新的 PCID生效后切换到目标基站。图 1为本发明一种切换方法的一个实施例的流程示意图，参考图 1 , 该流程包括： A first embodiment of the present invention provides a handover method for identifying and resolving identity conflicts in a network in advance of network handover. When it is known that the relay station needs to perform network handover, the serving base station eNB1 of the relay station first confirms whether there is a PCID collision in the relay station handover to the target base station; if there is a possible PCID collision, the serving base station eNB1 needs to allocate a new PCID to the handover relay station; Switch to the target base station after the new PCID takes effect. 1 is a schematic flowchart of an embodiment of a handover method according to the present invention. Referring to FIG. 1, the process includes:

S101 : 服务基站获得中继站需要切换到目标基站 eNB2的决定；服务基站可以根据中继站的测量报告及无线资源管理信息做出中继站切换的决定，并决定切换的目标基站；服务基站也可以接收中继站发送的第一切换请求消息，结合中继站上报的测量报告、基站间了解的情况，做出切换决定。如果第一切换请求消息中包含多个候选目标基站，则服务基站根据情况从多个候选目标基站中选择一个作为目标基站。 S101: The serving base station obtains a decision that the relay station needs to handover to the target base station eNB2; the serving base station may make a relay station handover decision according to the measurement report of the relay station and the radio resource management information, and determine the target base station to be handed over; the serving base station may also receive the transmission by the relay station. The first handover request message is combined with the measurement report reported by the relay station and the situation between the base stations to make a handover decision. If the first handover request message includes a plurality of candidate target base stations, the serving base station selects one of the plurality of candidate target base stations as the target base station according to the situation.

S102: 服务基站向目标基站发送切换请求，该切换请求中包含协商消息，用于与服务基站协商是否会存在 PCID 冲突；协商消息包含中继站的 PCID; S102: The serving base station sends a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the serving base station whether there is a PCID conflict; the negotiation message includes the PCID of the relay station;

服务基站向目标基站发送切换请求，该切换请求中包含目标基站为切换准备资源需要的信息。服务基站通过协商消息与目标基站协商，了解如果中继切换到目标基站后，在目标基站中是否会存在 PCID 冲突。服务基站可以在切换请求中携带协商消息，也可以直接向目标基站发送协商消息。 The serving base station sends a handover request to the target base station, where the handover request includes information required by the target base station to switch resources. The serving base station negotiates with the target base station through the negotiation message to know whether there is a PCID collision in the target base station after the relay is handed over to the target base station. The serving base station may carry the negotiation message in the handover request, or may directly send the negotiation message to the target base station.

S103: 服务基站接收目标基站的切换响应，该切换请求响应中包含响应协商消息生成的 PCID列表，该 PCID列表包括至少一个 PCID; S103: The serving base station receives a handover response of the target base station, where the handover request response includes a PCID list generated by the response negotiation message, where the PCID list includes at least one PCID;

收到协商消息后，如果目标基站确认可能存在 PCID冲突，选择一个或者多个 PCID供中继在目标基站中使用，并向服务基站发送切换请求响应 , 该切换请求响应中包含 PCID列表。该列表可以是目标基站推荐的 PCID集合或者目标基站不建议使用的 PCID集合。 PCID列表可以在切换请求响应中发送，也可以作为一条单独的消息向服务基站发送。 After receiving the negotiation message, if the target base station confirms that there may be a PCID collision, one or more PCIDs are selected for use by the relay in the target base station, and a handover request response is sent to the serving base station, where the handover request response includes a PCID list. The list may be a set of PCIDs recommended by the target base station or a set of PCIDs that the target base station does not recommend. The PCID list can be sent in the handover request response or sent as a separate message to the serving base station.

目标基站可以根据以下情况判断存在冲突的可能： The target base station can judge the possibility of conflict according to the following conditions:

a ) 目标小区中存在使用与中继站原 PCID相同的 PCID的站点；或 b ) 目标小区和目标小区周边小区中存在使用与中继站原 PCID相同的 PCID的站点。 a) there is a station in the target cell that uses the same PCID as the original PCID of the relay station; or b) there is a station in the target cell and the cell in the target cell that uses the same PCID as the original PCID of the relay station.

S104: 服务基站根据 PCID列表，为中继站分配一个新 PCID, 并向中继站发送 PCID更改消息，该 PCID更改消息中包含新 PCID, 用于通知中继站使用新 PCID切换到目标基站中。服务基站可以采用以下方式为中继站分配一个新 PCID: 从 PCID列表中选择一个 PCID作为新 PCID分配给中继站；或者，为中继站分配一个与 PCID列表中所有 PCID不同的新 PCID。 S104: The serving base station allocates a new PCID to the relay station according to the PCID list, and sends a PCID change message to the relay station, where the PCID change message includes a new PCID, and is used to notify the relay station to switch to the target base station by using the new PCID. The serving base station can assign a new PCID to the relay station in the following manner: Select a PCID from the PCID list as a new PCID to be assigned to the relay station; or, assign a new PCID to the relay station that is different from all PCIDs in the PCID list.

在另一种方案中， PCID更改消息可以包含新 PCID和更改 PCID的时间。用于通知中继在更改 PCID的时间到达时，使用新 PCID。更改 PCID 的时间可以是绝对帧号；也可以是相对帧号，即以接收到 PCID消息的当前帧开始计算。更改时间也可以是定时器的设置时间 T ( ms ), 终端在收到第二切换指示信息时，启动一个定时器，定时器时间为更改时间，在定时器到时后开始搜索和接收新的 PCID, 与服务站点进行同步。一般情况下，更改时间不为 0; 如果更改时间为 0。则其效果与未指定更改时间相同。 In another scenario, the PCID change message can contain the new PCID and the time to change the PCID. Used to notify the relay to use the new PCID when the time to change the PCID arrives. The time to change the PCID can be an absolute frame number; it can also be a relative frame number, that is, starting with the current frame that received the PCID message. The change time may also be the set time T (ms) of the timer. When the terminal receives the second switch indication information, the terminal starts a timer, the timer time is the change time, and the search and the new start are started after the timer expires. PCID, synchronized with the service site. In general, the change time is not 0; if the change time is 0. The effect is the same as the unspecified change time.

基于上述两种方式，服务基站在 PCID更改消息中还可以包含中继站切换时间 T_h, 另外该中继站切换时间 T_h, 还可以承载在其他的消息中。 Based on the foregoing two manners, the serving base station may further include a relay station switching time T _h in the PCID change message, and the relay station switching time T _h may also be carried in other messages.

进一步的，上述流程还包括：中继站与其下属终端交互，通知其下属终端其服务中继站不变但是变更了 PCID因此不必执行常规切换流程。中继站与其下属终端交互，通知其下属终端其服务中继站不变但是变更了 PCID 因此不必执行常规切换流程步骤包括： Further, the foregoing process further includes: the relay station interacts with its subordinate terminal, notifies its subordinate terminal that its service relay station does not change but changes the PCID, so it is not necessary to perform a regular handover procedure. The relay station interacts with its subordinate terminals, notifying its subordinate terminals that its service relay station is unchanged but changes the PCID, so it is not necessary to perform the normal handover procedure steps including:

中继站向终端发送第二切换指示信息，用于指示终端其服务中继站不变但是变更 PCID因此不必执行常规切换流程，所述第二切换指示信息中包含指示信息，新 PCID, 该指示信息表示归属的服务站点不变； The relay station sends the second handover indication information to the terminal, which is used to indicate that the terminal does not change the PCID but does not need to perform the normal handover procedure. The second handover indication information includes indication information, a new PCID, and the indication information indicates the attribution. The service site remains unchanged;

中继站变更和发送新 PCID, 如果有更改 PCID 的时间那么中继站在 PCID变更时间到达时，变更和发送新 PCID。另外中继站还会变更***内与 PCID相关的信息，如利用新 PCID生成新扰码序列等。相应地终端将在收到第二切换指示信息后，根据指示的内容变更***内与 PCID相关的信息，如***内扰码生成过程中与 PCID相关的信息等，另外也可以利用该新 PCID与原中继站保持同步。 The relay station changes and sends a new PCID. If there is a time to change the PCID, the relay station changes and sends a new PCID when the PCID change time arrives. In addition, the relay station also changes the information related to the PCID in the system, such as generating a new scrambling sequence using the new PCID. Correspondingly, after receiving the second handover indication information, the terminal changes the information related to the PCID in the system according to the indicated content, such as information related to the PCID in the process of generating the scrambling code in the system, and the new PCID may also be utilized. The original relay station remains synchronized.

可选定，中继站接收终端发送的 PCID更改确认。 Can be selected, the relay station receives the PCID change confirmation sent by the terminal.

该实施例中，在中继站切换到目标基站前，服务基站与目标基站协商确认可能存在 PCID冲突，月良务基站为中继站分配一个新的 PCID, 中继站启用新的 PCID后再切换到目标基站上，能够提前识别并避免 PCID冲突，避免网络切换中的干扰。 In this embodiment, before the relay station switches to the target base station, the serving base station negotiates with the target base station to confirm that there may be a PCID conflict, and the monthly service base station allocates a new PCID to the relay station, and the relay station enables the new PCID and then switches to the target base station. Ability to identify and avoid PCID conflicts in advance, Avoid interference in network switching.

参考图 2, 本发明一种切换方法的另一个实施例，包含： Referring to FIG. 2, another embodiment of a handover method according to the present invention includes:

S201 : 服务基站接收中继站发送的测量报告； S201: The serving base station receives the measurement report sent by the relay station.

中继站的定期或不定期向服务基站发送测量报告，服务基站接收测量报告。 The relay station periodically or irregularly sends a measurement report to the serving base station, and the serving base station receives the measurement report.

S202: 服务基站做出切换决定，并向目标基站发送切换请求，该切换请求中包含协商消息，用于与服务基站协商是否会存在 PCID冲突；协商消息包含中继站的 PCID; S202: The serving base station makes a handover decision, and sends a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the serving base station whether there is a PCID conflict; the negotiation message includes the PCID of the relay station;

服务基站根据测量报告及无线资源管理信息决定中继站是否要切换，如果要切换，服务基站向目标基站发送切换请求，该切换请求中包含目标基站为切换准备资源需要的信息。 The serving base station determines whether the relay station wants to switch according to the measurement report and the radio resource management information. If the handover is to be performed, the serving base station sends a handover request to the target base station, where the handover request includes information required by the target base station to prepare resources for handover.

服务基站通过协商消息与目标基站协商，了解如果中继切换到目标基站后，在目标基站中是否会存在 PCID 冲突。服务基站可以在切换请求中携带协商消息，也可以直接向目标基站发送协商消息。 The serving base station negotiates with the target base station through the negotiation message to know whether there is a PCID collision in the target base station after the relay is handed over to the target base station. The serving base station may carry the negotiation message in the handover request, or may directly send the negotiation message to the target base station.

S203: 目标基站确认可能存在 PCID冲突，选择一个或者多个 PCID供中继站在目标基站中使用，并向服务基站发送切换请求响应，该切换请求响应中包含 PCID列表，该 PCID列表包括至少一个 PCID; S203: The target base station confirms that there may be a PCID conflict, selects one or more PCIDs for use by the relay station in the target base station, and sends a handover request response to the serving base station, where the handover request response includes a PCID list, where the PCID list includes at least one PCID;

如果目标基站确认可能存在 PCID冲突，向服务基站推荐一个或者多个 PCID供中继站在目标基站中使用。目标基站可以根据以下情况判断存在冲突的可能： If the target base station confirms that there may be a PCID collision, one or more PCIDs are recommended to the serving base station for use by the relay station in the target base station. The target base station can judge the possibility of conflict based on the following conditions:

根据冲突判断结果，目标基站向服务基站提供一个 PCID列表，该列表可以是目标基站推荐的 PCID集合或者目标基站不建议使用的 PCID集合。 PCID列表可以在切换请求响应中发送，也可以作为一条单独的消息向服务基站发送。在切换请求中携带 PCID列表，不需要增加新的消息，能很好的与现有协议兼容。 According to the conflict judgment result, the target base station provides a list of PCIDs to the serving base station, and the list may be a PCID set recommended by the target base station or a PCID set not recommended by the target base station. The PCID list can be sent in the handover request response or sent as a separate message to the serving base station. Carrying a PCID list in the handover request does not require adding a new message, and is well compatible with existing protocols.

S204: 服务基站根据 PCID列表和本小区的 PCID使用情况，为中继站分配一个新 PCID, 并向中继站发送 PCID更改消息 , 该 PCID更改消息中包含新 PCID, 用于通知中继站使用新 PCID。 S204: The serving base station is a relay station according to the PCID list and the PCID usage of the current cell. A new PCID is assigned and a PCID change message is sent to the relay station, the PCID change message containing a new PCID for informing the relay station to use the new PCID.

服务基站可以采用以下方式为中继站分配一个新 PCID: 从 PCID列表中选择一个 PCID作为新 PCID分配给中继站；或者，为中继站分配一个与 PCID列表中所有 PCID不同的新 PCID。 The serving base station can assign a new PCID to the relay station in the following manner: Select a PCID from the PCID list as a new PCID to be assigned to the relay station; or, assign a new PCID to the relay station that is different from all PCIDs in the PCID list.

在另一种方案中， PCID更改消息可以包含新 PCID和更改 PCID的时间。用于通知中继站在更改 PCID的时间到达时，使用新 PCID。基于上述两种方式，服务基站在 PCID更改消息中还可以包含中继站切换时间 T_h, 另外该中继站切换时间 T_h, 还可以承载在其他的消息中。 In another scenario, the PCID change message can include the new PCID and the time to change the PCID. Used to notify the relay station to use the new PCID when the time to change the PCID arrives. Based on the foregoing two manners, the serving base station may further include a relay station switching time T _h in the PCID change message, and the relay station switching time T _h may also be carried in other messages.

在 PCID更改消息中 , 还可以包括了分配给中继站的新标示 C-RNTI, 现有技术中 C-RNTI为 16bit的序列，在一种实现方式中，可以该中继站新标示为少于 16bit的缩短的 rC-RNTI, 例如可以采用 lObit的 rC-RNTI。中继站利用该缩短的 rC-RNTI进行***内扰码相关的流程；在另一种实现方式中，服务基站为终端分配一个少于 16bit的缩短的 rC-RNTI, 该少于 16bit 的 rC-RNTI可以对应一个 16bit的 C-RNTI, 在中继站和基站存在这种映射关系。获得服务基站分配到的 r-CRNTI后，中继站根据映射关系获得对应的 C-RNTI, 随后利用该 C-RNTI进行***内扰码相关的流程。由于在一个基站的服务范围内所能部署的中继站个数比 UE的小的多。因此可以使用更少比特的标示来标示中继站，这样可以保证空口消息中开销减少，但是不会影响中继站或者基站延用 LTE PHY 中扰码相关的流程。 In the PCID change message, a new labeled C-RNTI allocated to the relay station may be included. In the prior art, the C-RNTI is a 16-bit sequence. In an implementation manner, the relay station may be newly marked with a shortening of less than 16 bits. For the rC-RNTI, for example, lObit rC-RNTI can be used. The relay station uses the shortened rC-RNTI to perform the intra-system scrambling code related process. In another implementation manner, the serving base station allocates a shortened rC-RNTI of less than 16 bits to the terminal, and the less than 16-bit rC-RNTI can Corresponding to a 16-bit C-RNTI, this mapping relationship exists between the relay station and the base station. After obtaining the r-CRNTI allocated by the serving base station, the relay station obtains the corresponding C-RNTI according to the mapping relationship, and then uses the C-RNTI to perform the process related to the scrambling code in the system. Since the number of relay stations that can be deployed within the service range of one base station is much smaller than that of the UE. Therefore, the label can be marked with fewer bits to ensure that the overhead in the air interface message is reduced, but it does not affect the process of the relay station or the base station extending the scrambling code in the LTE PHY.

S205: 可选的，中继站向服务基站发送确认消息，用于确认接受 PCID 更改。 S205: Optionally, the relay station sends an acknowledgement message to the serving base station to confirm acceptance of the PCID change.

进一步的，还包括：中继站将新 PCID通知给周边邻居小区。中继站将新 PCID通知给周边邻居小区的步骤具体包括： Further, the method further includes: the relay station notifying the neighboring neighbor cell of the new PCID. The step of the relay station notifying the neighboring cell to the new PCID includes:

一种方式中，在更改了自身的 PCID后，中继站可通过 S1或者 X2消息信令将更改信息通知给邻居周边小区，让邻居小区更新其各自的邻居小区列表；中继站点也可以通过其归属的上级站点，由上级站点用 X2消息信令将更改信息通知给邻居周边小区，让邻居小区更新其各自的邻居小区列表。所述更改信息可以包括：中继站的新 PCID; 更改信息也可以包括：中继站的新 PCID, PCID所工作的新工作频率；在另一种方式中，在更改自身的 PCID前，中继站可通过 X2消息信令将更改信息通知给周边邻居小区，让邻居小区更新其各自的邻居小区列表；中继站也可以通过其归属的上级站点，由上级站点用 X2消息信令将更改信息通知给邻居周边小区，让邻居小区更新其各自的邻居小区列表。所述更改信息可以包括：中继站的新 PCID, 更改时间；更改信息也可以包括：中继站的新 PCID, PCID所工作的新工作频率，更改时间。对于上述两种方式，上述邻居周边小区收到更改信息后，可以把更改信息发给自己的邻区以及其下属的终端。发给自己的邻区用于避免 PCID混淆；通过广播和 /或者专用消息发给送更改信息给自己下属的终端用于更改时间之后下属的终端在测量报告中使用新的 PCID。其方式可以类似于服务站点通知其下属的终端。 In one mode, after changing its own PCID, the relay station may notify the neighbor neighboring cell of the change information through the S1 or X2 message signaling, and let the neighbor cell update its respective neighbor cell list; the relay station may also pass its belonging In the upper-level site, the upper-level site notifies the neighboring cell of the change information by X2 message signaling, and causes the neighbor cell to update its neighbor cell list. The change information may include: a new PCID of the relay station; the change information may also include: The new PCID of the relay station, the new working frequency at which the PCID works; In another mode, before changing its own PCID, the relay station can notify the neighboring neighboring cells of the change information through X2 message signaling, and let the neighboring cells update their respective The neighboring cell list; the relay station may also notify the neighboring neighboring cell of the change information by using the X2 message signaling by the upper-level station, and let the neighboring cell update its respective neighbor cell list. The change information may include: a new PCID of the relay station, a change time; the change information may also include: a new PCID of the relay station, a new working frequency at which the PCID operates, and a change time. For the above two methods, after receiving the change information, the neighboring neighboring cell may send the change information to its neighboring cell and its subordinate terminal. The neighboring area is sent to its own to avoid PCID confusion; the change information is sent to its own subordinate terminal through broadcast and/or dedicated messages for the subordinate terminal to change the time after the subordinate terminal uses the new PCID in the measurement report. It can be similar to the terminal that the service station notifies its subordinates.

S206: 中继站与其下属 UEs交互，通知其下属 UEs利用新 PCID接入该中继站； S206: The relay station interacts with its subordinate UEs, and notifies its subordinate UEs to access the relay station by using a new PCID;

一个实施例中，该步骤可以包括以下过程： In one embodiment, the step may include the following process:

6-1.中继站向终端发送切换指令，启动常规 LTE切换流程。 6-1. The relay station sends a handover command to the terminal to start the normal LTE handover procedure.

终端 UEs将切换到发送新 PCID的原中继站下，该新的 PCID对于 UE 就是一个目标 cell ID。该切换指令为 LTE***常规的切换指令，包含为 UE 分配切换后使用的 C-RNTI, PCID等信息； The terminal UEs will switch to the original relay station that sent the new PCID, which is a target cell ID for the UE. The handover command is a conventional handover instruction of the LTE system, and includes information about a C-RNTI, a PCID, and the like used after the handover is allocated to the UE;

如果 PCID更改消息包含新 PCID和更改 PCID的时间 , 则中继站可以在收到 PCID更改消息后立即向终端发送切换指令，也可以在收到 PCID更改消息后的 t时间后向终端发送切换命令。在后一种实施方式中，中继站发送切换命令的时机 t可以按照下列两种方式考虑： If the PCID change message contains the new PCID and the time to change the PCID, the relay station may send a handover command to the terminal immediately after receiving the PCID change message, or may send a handover command to the terminal after the t time after receiving the PCID change message. In the latter embodiment, the timing at which the relay station transmits the handover command can be considered in the following two ways:

由于 PCID 的更换是以帧为单位的，中继站发送切换命令的传输时延 T1和 UE处理时延 T2是可以预先估计的 , 殳更改 PCID的时间为 T, 为了保证 UE实施切换前中继站已经使用新 PCID,即在时间上要满足 t+Tl+T2 > T, 中继站需要在 Τ-(Τ1+Τ2)时刻之后向终端发送切换命令； Since the replacement of the PCID is in units of frames, the transmission delay T1 and the UE processing delay T2 of the relay station transmitting the handover command can be estimated in advance, and the time for changing the PCID is T, in order to ensure that the relay station has used the new relay before the handover is implemented. PCID, that is, t+Tl+T2 > T is satisfied in time, and the relay station needs to send a handover command to the terminal after the time of Τ-(Τ1+Τ2);

在另一种情况下，终端在接收到中继站的切换命令后，开始启动定时器 Τ3 , 在定时器 Τ3到期前完成切换处理，根据 LTE协议（36.331 ), 定时器 Τ3的值可以从以下序列中选择： {50ms, 100ms, 150 ms, 200ms, 500ms, 1000ms, 2000ms } ,在这种情况下，中继站可以为终端指定一个定时器的值，为了保证 UE 实施切换前中继站已经使用新 PCID , 即在时间上要满足 t+T 1 +T2+T3 > T, 中继站在 Τ-(Τ 1 +Τ2+Τ3) 时刻之后向终端发送切换命令。 In another case, after receiving the handover command of the relay station, the terminal starts to start the timer Τ3, and completes the handover process before the timer Τ3 expires. According to the LTE protocol (36.331), the value of the timer Τ3 can be from the following sequence. Medium choice: {50ms, 100ms, 150ms, 200ms, 500ms, 1000ms, 2000ms } , in this case, the relay station can specify a timer value for the terminal. In order to ensure that the relay station has used the new PCID before the UE implements the handover, it must satisfy t+T 1 +T2+T3 > T in time. The relay station sends a handover command to the terminal after the time Τ-(Τ 1 +Τ2+Τ3).

6-2.UES在接收到切换指令后，启动与目标站点的同步过程； 6-2. After receiving the handover instruction, the UES starts a synchronization process with the target site;

6-3.目标站点（发送新 PCID的原中继站）对同步进行响应，包括上行分配和定时提前； 6-3. The target site (the original relay station that sent the new PCID) responds to the synchronization, including uplink allocation and timing advance;

6-4. 终端成功接入到目标站点。发送切换确认消息指示 UE的切换过程: ¾成。 6-4. The terminal successfully accesses the target site. The handover handover confirmation message indicates the UE handover procedure: 3⁄4.

S207: 中继站向服务基站发送 PCID更改确认消息，通知其 PCID已经修改完成，可以启动切换流程； S207: The relay station sends a PCID change confirmation message to the serving base station, notifying that the PCID has been modified, and the handover process may be started;

此步骤为可选步骤。例如中继站在确认其所属终端收到和完成新 PCID 更改后，可以直接启动切换流程，而不向服务基站发送 PCID更改确认消息；又例如，服务基站通过 PCID更改确认消息或者其他消息通知了中继站切换的是时间 T_h,那么中继站可以按照服务基站指示，在规定的 T_h切换到目标小区，而无须发送 PCID更改确认消息。 This step is an optional step. For example, after the relay station confirms that its own terminal receives and completes the new PCID change, it can directly initiate the handover procedure without sending a PCID change confirmation message to the serving base station; for example, the serving base station notifies the relay station to switch through the PCID change confirmation message or other message. It is time T _h , then the relay station can switch to the target cell at the specified T _h according to the indication of the serving base station without sending a PCID change confirmation message.

S208: 服务基站发送切换指令消息给中继站，提供中继站切换到目标基站的信息； S208: The serving base station sends a handover instruction message to the relay station, and provides information that the relay station switches to the target base station.

此步骤为可选步骤，在另一种实现方式中，在步骤 S204服务基站向中继站发送的切换请求响应中包含了中继的切换信息，服务基站可以不发送切换请求消息给中继站，中继站可以在向服务基站发送 PCID更改确认消息后，即启动切换流程，与目标基站进行同步。 This step is an optional step. In another implementation manner, the handover request response sent by the serving base station to the relay station in step S204 includes the handover information of the relay, and the serving base station may not send the handover request message to the relay station, and the relay station may be in the After transmitting the PCID change confirmation message to the serving base station, the handover procedure is initiated and synchronized with the target base station.

S209: 中继站启动切换流程，与目标基站进行同步过程，进行接入流程； S209: The relay station initiates a handover process, and performs a synchronization process with the target base station to perform an access process.

S210: 中继站成功接入到目标站点。发送切换确认消息指示中继站的切换过程完成。 S210: The relay station successfully accesses the target station. A handover handover confirmation message indicates that the handover procedure of the relay station is completed.

该实施例中，在中继站切换到目标基站前，服务基站与目标基站协商确认可能存在 PCID冲突，月良务基站为中继站分配一个新的 PCID, 中继站启用新的 PCID后再切换到目标基站上，能够提前识别并避免 PCID冲突，避免网络切换中的干扰。如图 3所示，在另一种实现方式中，步骤 S306中继站与其下属终端交互，通知其下属终端利用新 PCID接入该中继站，可以包含以下步骤： In this embodiment, before the relay station switches to the target base station, the serving base station negotiates with the target base station to confirm that there may be a PCID conflict, and the monthly service base station allocates a new PCID to the relay station, and the relay station enables the new PCID and then switches to the target base station. It can identify and avoid PCID conflicts in advance and avoid interference in network switching. As shown in FIG. 3, in another implementation manner, in step S306, the relay station interacts with its subordinate terminal to notify the subordinate terminal to access the relay station by using the new PCID, which may include the following steps:

S301 : 中继站向终端发送第二切换指示信息，用于指示终端其归属的中继站不变，但中继站的 PCID变更了，不执行切换流程。所述第二切换指示信息中包含指示信息，新 PCID。指示信息表示不需要进行网络切换。 S301: The relay station sends the second handover indication information to the terminal, and is used to indicate that the relay station to which the terminal belongs is unchanged, but the PCID of the relay station is changed, and the handover procedure is not performed. The second switching indication information includes indication information, a new PCID. The indication message indicates that no network switching is required.

指示信息表示终端归属的中继站不变，不需要进行切换。指示信息可以是明确的一个指示标识，例如一个比特的信息表示不需要进行网络切换；指示信息也可以是一个隐含的标识，例如采用特定或者特殊的指令消息携带新信息，隐含通知终端其归属服务站点不变，不需要进行网络切换。 The indication information indicates that the relay station to which the terminal belongs is unchanged, and no handover is required. The indication information may be an explicit indication identifier, for example, one bit of information indicates that network switching is not required; the indication information may also be an implicit identifier, for example, carrying a new information by using a specific or special instruction message, implicitly notifying the terminal that The home service site is unchanged and no network switch is required.

在第二种方案中第二切换指示信息可以包含：指示信息，新 PCID和更改时间。用于通知终端：中继站将在更改时间到达时使用新 PCID。 In the second scheme, the second handover indication information may include: indication information, a new PCID, and a change time. Used to inform the terminal: The relay station will use the new PCID when the change time arrives.

S302: 终端从第二切换指示信息中获得指示信息，新 PCID; S302: The terminal obtains indication information, a new PCID, from the second handover indication information.

终端根据指示信息和新 PCID 获知归属的中继站不变，但中继站的 The terminal learns that the home relay station is unchanged according to the indication information and the new PCID, but the relay station

PCID发生了变化，无需网络切换。 The PCID has changed and no network switching is required.

在第二种方案中，终端从第二切换指示信息中获得指示信息，新 PCID, 更改时间。 In the second scheme, the terminal obtains the indication information, the new PCID, and the change time from the second handover indication information.

S303: 利用新 PCID更新与 PCID相关的信息； S303: Update the information related to the PCID by using the new PCID;

终端根据指示信息获知终端的服务站点不变，但服务站点的 PCID发生了变化，不需要进行网络切换。终端变更与 PCID相关的内容，例如***内扰码生成过程中与 PCID相关的信息等。 The terminal learns from the indication information that the service station of the terminal does not change, but the PCID of the service site changes, and no network handover is required. The terminal changes the content related to the PCID, such as information related to the PCID during the scrambling code generation process in the system.

在第二种方案中，终端在更改时间到达时，变更与新 PCID相关的内容，如***内扰码生成过程中与 PCID相关的信息等。 In the second scheme, the terminal changes the content related to the new PCID when the change time arrives, such as information related to the PCID in the scrambling code generation process in the system.

另外终端还可以利用该新 PCID与原中继站进行同步。 In addition, the terminal can also synchronize with the original relay station by using the new PCID.

对应地，中继站变更并发送新 PCID; 在另一种实施方式中，中继站在变更时间到达时，变更并发送自身的 PCID。另外中继站还会变更***内与 Correspondingly, the relay station changes and transmits a new PCID. In another embodiment, the relay station changes and transmits its own PCID when the change time arrives. In addition, the relay station will also change the system and

PCID相关的信息，如利用新 PCID生成新 4尤码序列等。 PCID related information, such as generating a new 4 special code sequence using the new PCID.

S304: 可选的 , 终端向中继站发送 UE PCID更改确认消息。 S304: Optionally, the terminal sends a UE PCID change confirmation message to the relay station.

终端向中继站发送 PCID 更改确认消息，用于通知中继站确认更改流程。步骤 S303与步骤 S304之间无严格的执行顺序，可以按任意顺序执行。该实施例中 ,在服务基站为中继站分配一个新的 PCID时，中继站向其下属的终端发送指示信息，指示下属的终端仅更改 PCID但不进行切换，优化切换流程，提高切换效率，节约了网络资源。 The terminal sends a PCID change confirmation message to the relay station to notify the relay station to confirm the change process. There is no strict execution order between step S303 and step S304, and it can be executed in any order. In this embodiment, when the serving base station allocates a new PCID to the relay station, the relay station sends indication information to the subordinate terminal, indicating that the subordinate terminal only changes the PCID but does not perform handover, optimizes the handover process, improves the switching efficiency, and saves the network. Resources.

在上实施例中，在中继站的 PCID发生变化时，中继站向其下属的终端发送指示信息，指示下属的终端仅更改 PCID但不进行切换，优化切换流程，提高切换效率，节约了网络资源。 In the above embodiment, when the PCID of the relay station changes, the relay station sends indication information to the subordinate terminal, indicating that the subordinate terminal only changes the PCID but does not perform handover, optimizes the handover procedure, improves handover efficiency, and saves network resources.

本发明的实施例中提及的第二切换指示信息，在信息发送方式上，中继站可以向下属的每个终端都发送一个第二切换指示信息，也可以采用广播的方式向其下属的所有终端广播该第二切换指示信息。在第二切换指示信息的消息设计上，可以设计一种新的消息，也可以采用现有消息来承载第二切换指示信息的内容。 The second handover indication information mentioned in the embodiment of the present invention, in the information transmission manner, the relay station may send a second handover indication information to each terminal of the subordinate, or may broadcast to all terminals of the subordinates. The second handover indication information is broadcasted. In the message design of the second handover indication information, a new message may be designed, or the existing message may be used to carry the content of the second handover indication information.

1*列 ^口,对于广播方式,可以在 RRC connection reconfiguration message 中的 mobilityControlInformation 内承载第二切换指示信息的内容。对于上述步骤中的指示信息可以用 1 比特表示，当该比特为 0是表示用于指示终端其归属的中继站不变，但中继站 PCID变更，不执行常规切换流程；该比特为 1时表示为常规的切换。 1* column ^ port, for the broadcast mode, the content of the second handover indication information may be carried in the mobilityControlInformation in the RRC connection reconfiguration message. The indication information in the above steps may be represented by 1 bit. When the bit is 0, it indicates that the relay station for indicating the attribution of the terminal is unchanged, but the relay station PCID is changed, and the normal handover procedure is not performed; when the bit is 1, it is expressed as a regular Switching.

对于广播方式,可以采用 system information message来载第二切换指示信息的内容。具体的，又可以采用以下两种方式来实现： For the broadcast mode, the system information message can be used to carry the content of the second handover indication information. Specifically, it can be implemented in the following two ways:

(1)有固定时间发送 system information message的情况 (1) There is a fixed time to send system information message

中继站在广播 aging寻呼消息后，在固定的时间周期内广播 system information message ***消息给 UEs , 用于 UEs***信息更新。 ***消息可以包含：新 PCID。 ***消息也可以包含：新 PCID和更改时间。由于系统消息不是切换消息，中继站发送包含 PCID 的***消息即暗含服务站不变，但是其 PCID是更改了。在另一种方案中， ***消息也可以明确包含一个指示信息，说明服务站不变。这种情况下， ***消息可以包含：新 PCID , 指示信息。 ***消息也可以包含：新 PCID, 更改时间，指示信息。例如，可以用一个比特表示其归属的中继站不变。 After the broadcast aging paging message, the relay station broadcasts a system information message system message to the UEs for a fixed time period for UEs system information update. System messages can contain: New PCID. System messages can also contain: New PCID and change time. Since the system message is not a handover message, the relay station sends a system message containing the PCID, which implies that the service station does not change, but its PCID is changed. In another scenario, the system message may also explicitly include an indication that the service station is unchanged. In this case, the system message can contain: New PCID, indication information. System messages can also contain: New PCID, change time, indication information. For example, one bit can be used to indicate that the relay station to which it belongs is unchanged.

(2)无固定时间发送 system information message的情况中继站在需要发送 system information message 时, 首先广播 aging message寻呼消息给其所有下属 UEs,里面包含了 system information发送的时间 T, 通知其所有下属 UEs中继站将在 T时刻广播 system information message。中继站在时间 T 广播 system information message ***消息给 UEs。 ***消息可以包含：新 PCID。 ***消息也可以包含：新 PCID和更改时间。由于***消息不是切换消息，中继站发送***消息即暗含服务站不变，但是其 PCID是更改了。在另一种方案中， ***消息中也可以明确包含一个指示信息，说明服务站不变。这种情况下， ***消息可以包含：新 PCID, 指示信息。 ***消息也可以包含：新 PCID, 更改时间，指示信息。例如，可以用一个比特表示其中继站不变。 (2) There is no fixed time to send system information message When the relay station needs to send the system information message, it first broadcasts the aging message paging message to all its subordinate UEs, which contains the time T sent by the system information, and informs all its subordinate UEs that the relay station will broadcast the system information message at time T. The relay station broadcasts a system information message system message to the UEs at time T. System messages can contain: New PCID. System messages can also contain: New PCID and change time. Since the system message is not a handover message, the relay station sends a system message, which implies that the service station does not change, but its PCID is changed. In another scenario, the system message may also explicitly include an indication that the service station is unchanged. In this case, the system message can contain: New PCID, indication information. System messages can also contain: New PCID, change time, indication information. For example, one bit can be used to indicate that its relay station is unchanged.

指示信息表示终端归属的中继站不变，不需要进行切换。指示信息可以是明确的一个指示标识，例如一个比特的信息表示不需要进行网络切换；指示信息也可以是一个隐含的标识，例如采用特定或者特殊的指令消息携带新信息，隐含通知终端其归属中继站不变，不需要进行网络切换。 The indication information indicates that the relay station to which the terminal belongs is unchanged, and no handover is required. The indication information may be an explicit indication identifier, for example, one bit of information indicates that network switching is not required; the indication information may also be an implicit identifier, for example, carrying a new information by using a specific or special instruction message, implicitly notifying the terminal that The home relay station is unchanged, and no network switching is required.

参考图 4, 本发明一种切换方法的另一个实施例，包含： Referring to FIG. 4, another embodiment of a handover method according to the present invention includes:

S401 : 中继站发送第一切换请求消息给服务基站，其中包含了切换的一个或者多个候选目标基站。 S401: The relay station sends a first handover request message to the serving base station, where the one or more candidate target base stations of the handover are included.

S402: 服务基站根据第一切换请求消息做出切换决定，并向目标基站发送切换请求，该切换请求中包含协商消息，用于与服务基站协商是否会存在 PCID冲突；协商消息包含中继站的 PCID; S402: The serving base station sends a handover decision according to the first handover request message, and sends a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the serving base station whether there is a PCID conflict; the negotiation message includes the PCID of the relay station;

服务基站根据第一切换请求消息，结合中继站上报的测量报告、基站间了解的情况，做出切换决定。如果第一切换请求消息中包含多个候选目标基站，则服务基站根据情况从多个候选目标基站中选择一个作为目标基站。 The serving base station makes a handover decision according to the first handover request message, combined with the measurement report reported by the relay station, and the situation between the base stations. If the first handover request message includes a plurality of candidate target base stations, the serving base station selects one of the plurality of candidate target base stations as the target base station according to the situation.

服务基站向目标基站发送切换请求，该切换请求中包含目标基站为切换准备资源需要的信息。 The serving base station sends a handover request to the target base station, where the handover request includes information required by the target base station to switch resources.

服务基站通过协商消息与目标基站协商，了解如果中继站切换到目标基站后，在目标基站中是否会存在 PCID 冲突。服务基站可以在切换请求中携带协商消息，也可以直接向目标基站发送协商消息。步骤 S403至 S410的流程与前一个实施例中步骤 S203至 S210的流程类似，在此不予赘述。 The serving base station negotiates with the target base station through the negotiation message to know whether there is a PCID conflict in the target base station after the relay station switches to the target base station. The serving base station may carry the negotiation message in the handover request, or may directly send the negotiation message to the target base station. The processes of steps S403 to S410 are similar to the processes of steps S203 to S210 in the previous embodiment, and are not described herein.

该实施例中，由中继站发起切换请求，在切换到目标基站前，服务基站与目标基站协商确认可能存在 PCID冲突，服务基站为中继站分配一个新的 PCID, 在中继站启用新的 PCID后再切换到目标基站上，能够提前识别并避免 PCID冲突，避免网络切换中的干扰。 In this embodiment, the handover request is initiated by the relay station. Before switching to the target base station, the serving base station negotiates with the target base station to confirm that there may be a PCID conflict. The serving base station allocates a new PCID to the relay station, and then switches to the relay station after enabling the new PCID. On the target base station, PCID collisions can be identified and avoided in advance to avoid interference in network handover.

如图 3所示，在另一种实现方式中，步骤 S406中继站与其下属终端交互，通知其下属终端利用新 PCID接入该中继站，可以包含 S301 至 S304 的步骤。 As shown in FIG. 3, in another implementation manner, in step S406, the relay station interacts with its subordinate terminal to notify its subordinate terminal to access the relay station by using the new PCID, and may include the steps of S301 to S304.

参考图 5, 本发明一种切换方法的另一个实施例，包含： Referring to FIG. 5, another embodiment of a handover method according to the present invention includes:

S501 : 服务基站接收中继站发送的测量报告； S501: The serving base station receives the measurement report sent by the relay station.

S502: 服务基站做出切换决定，并向目标基站发送切换请求，该切换请求中包含协商消息，用于与服务基站协商是否会存在 PCID冲突；协商消息包含中继站的 PCID; S502: The serving base station makes a handover decision, and sends a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the serving base station whether there is a PCID conflict; the negotiation message includes the PCID of the relay station;

服务基站通过协商消息与目标基站协商，了解如果中继站切换到目标基站后，在目标基站中是否会存在 PCID 冲突。服务基站可以在切换请求中携带协商消息，实现与现有协议的兼容，也可以直接向目标基站发送协商消息。 The serving base station negotiates with the target base station through the negotiation message to know whether there is a PCID collision in the target base station after the relay station switches to the target base station. The serving base station may carry the negotiation message in the handover request to implement compatibility with the existing protocol, or may directly send the negotiation message to the target base station.

该切换请求消息中还包含频率信息，频率信息可以包含第一频率，也可以包含第一频率和第二频率，其中第一频率为中继站与终端通信使用的频率，第二频率为中继站与服务基站通信使用的频率。当然，服务基站也可以单独采用另一条消息发送频率信息。 The switching request message further includes frequency information, where the frequency information may include the first frequency, and may also include the first frequency and the second frequency, where the first frequency is a frequency used by the relay station to communicate with the terminal, and the second frequency is a relay station and a serving base station. The frequency used for communication. Of course, the serving base station can also use another message to send frequency information.

S503: 目标基站确认可能存在 PCID冲突，选择一个或者多个 PCID供中继在目标基站中使用，并向服务基站发送切换请求响应，该切换请求响应中包含 PCID列表和更改的频率信息，该 PCID列表包括至少一个 PCID; 如果目标基站确认可能存在 PCID冲突。目标基站向服务基站推荐一个或者多个 PCID供中继站在目标基站中使用。目标基站可以根据以下情况判断存在冲突的可能： S503: The target base station confirms that there may be a PCID conflict, select one or more PCIDs for the relay to use in the target base station, and send a handover request response to the serving base station, where the handover request is ringing The PCID list and the changed frequency information should be included, the PCID list including at least one PCID; if the target base station confirms that there may be a PCID conflict. The target base station recommends one or more PCIDs to the serving base station for use by the relay station in the target base station. The target base station can judge the possibility of conflict according to the following conditions:

a ) 目标小区中存在使用与中继站原 PCID相同的 PCID的站点；或 b ) 目标小区和目标小区周边小区中存在使用与中继站原 PCID相同的 a) there is a station in the target cell that uses the same PCID as the original PCID of the relay station; or b) that the target cell and the cell in the target cell have the same use as the original PCID of the relay station.

PCID的站点。 PCID site.

根据冲突判断结果，目标基站向服务基站提供一个 PCID列表，该列表可以是目标基站推荐的 PCID集合或者目标基站不建议使用的 PCID集合。 According to the conflict judgment result, the target base station provides a list of PCIDs to the serving base station, and the list may be a PCID set recommended by the target base station or a PCID set not recommended by the target base station.

如果目标基站确认中继站使用的频率需要变更，则切换请求响应中包含一个频率变更信息，频率变更信息可以包含新的第一频率和新的第二频率中的至少一个。显然，目标基站可以采用单独的消息发送 PCID列表或者频率变更信息。 If the target base station confirms that the frequency used by the relay station needs to be changed, the handover request response includes a frequency change information, and the frequency change information may include at least one of a new first frequency and a new second frequency. Obviously, the target base station can send a PCID list or frequency change information using a separate message.

S504: 服务基站根据 PCID列表和本小区的 PCID使用情况，为中继站分配一个新 PCID, 并向中继站发送 PCID更改消息，该 PCID更改消息中包含新 PCID, 用于通知中继站使用新 PCID。 S504: The serving base station allocates a new PCID to the relay station according to the PCID list and the PCID usage of the current cell, and sends a PCID change message to the relay station, where the PCID change message includes a new PCID for notifying the relay station to use the new PCID.

在另一种方案中， PCID更改消息可以包含新 PCID和更改 PCID的时间。用于通知中继在更改 PCID的时间到达时 , 使用新 PCID。 In another scenario, the PCID change message can contain the new PCID and the time to change the PCID. Used to notify the relay to use the new PCID when the time to change the PCID arrives.

如果在步骤 S503中目标基站更改了第一频率或第二频率，则服务基站需要将新的第一频率、第二频率通知给中继站。该 PCID更改消息中包含新 PCID和新的第一频率或新的第二频率。在另一种方式中该 PCID更改消息中包含新 PCID, 更改时间，和新的第一频率或新的第二频率。 PCID更改消息中同时将新的第一频率发送给中继站，中继站可以切换之前进行频段更换，同时也可以节约信令。在另一种实现方案中，服务基站可以向中继站发送第一频率更改消息，将新的第一频率发送给中继站。通过这种方式，服务基站可以不限于在本步骤中发送第一频率更改消息，例如其可以在中继站切换之后发送第一频率更改消息，进行频段更换。 If the target base station changes the first frequency or the second frequency in step S503, the serving base station needs to notify the relay station of the new first frequency and the second frequency. The PCID change message contains the new PCID and the new first frequency or the new second frequency. In another way, the PCID change message contains the new PCID, the change time, and the new first frequency or the new second frequency. In the PCID change message, the new first frequency is simultaneously sent to the relay station, and the relay station can perform band replacement before switching, and can also save signaling. In another implementation, the serving base station may forward to the relay The station sends a first frequency change message to send a new first frequency to the relay station. In this way, the serving base station may not be limited to transmitting the first frequency change message in this step, for example, it may transmit the first frequency change message after the relay station handover to perform band replacement.

S505: 可选的，中继站向服务基站发送确认消息，用于确认接受 PCID 更改。 S505: Optionally, the relay station sends an acknowledgement message to the serving base station for confirming acceptance of the PCID change.

进一步的，还包括：中继站将新 PCID和新的第一频率通知给周边邻居小区。 Further, the method further includes: the relay station notifying the neighboring cell to the new PCID and the new first frequency.

S506: 中继站与其下属 UEs交互，通知其下属 UEs利用新 PCID接入该中继站； S506: The relay station interacts with its subordinate UEs, and notifies its subordinate UEs to access the relay station by using a new PCID;

终端 UEs将切换到发送新 PCID的原中继站下，该新的 PCID对于 UE 相当于一个目标基站的标示。该切换指令为 LTE***常规的切换指令，包含为 UE分配切换后使用的 C-RNTI, PCID等信息；如果第一频率发生变化，还包括新的第一频率。 The terminal UEs will switch to the original relay station that sent the new PCID, which is equivalent to the identity of a target base station for the UE. The handover command is a conventional handover command of the LTE system, and includes information about a C-RNTI, a PCID, and the like used after the handover is allocated to the UE. If the first frequency changes, the new first frequency is also included.

如果 PCID更改消息包含新 PCID和更改 PCID的时间 , 则中继站可以在收到 PCID更改消息后立即向终端发送切换指令，也可以在 t时间后向终端发送切换命令。 t时间的获得参照上一个实施例中 6-1步骤的描述。 If the PCID change message contains the new PCID and the time to change the PCID, the relay station may send a handover command to the terminal immediately after receiving the PCID change message, or may send a handover command to the terminal after t time. The t time is obtained by referring to the description of step 6-1 in the previous embodiment.

S507: 可选的，中继站向服务基站发送 PCID 更改确认消息，通知其 PCID已经修改完成，可以启动切换流程； S507: Optionally, the relay station sends a PCID change confirmation message to the serving base station, notifying that the PCID has been modified, and the handover process may be started;

S508: 服务基站发送切换请求消息给中继站，提供中继站切换到目标基站的信息； S508: The serving base station sends a handover request message to the relay station, and provides information that the relay station switches to the target base station.

此步骤为可选步骤，在另一种实现方式中，在步骤 S504服务基站向中继站发送的切换请求响应中包含了中继的切换信息，服务基站可以不发送切换请求消息给中继站，中继站可以在向服务基站发送 PCID更改确认消息后，即启动切换流程，与目标基站进行同步。 This step is an optional step. In another implementation manner, the handover request response sent by the serving base station to the relay station in step S504 includes the handover information of the relay, and the serving base station may not send the handover information. The handover request message is sent to the relay station, and the relay station may initiate a handover procedure to synchronize with the target base station after transmitting the PCID change confirmation message to the serving base station.

S509: 中继站收到切换请求消息后启动切换流程，与目标基站进行同步过程，目标基站对同步进行响应，包括上行分配和定时提前； S509: After receiving the handover request message, the relay station starts a handover procedure, and performs a synchronization process with the target base station, where the target base station responds to the synchronization, including uplink allocation and timing advance;

S510: 中继站成功接入到目标站点，发送切换确认消息指示中继站的切换过程完成。 S510: The relay station successfully accesses the target station, and sends a handover confirmation message indicating that the handover process of the relay station is completed.

该实施例中，在中继站切换到目标基站前，服务基站与目标基站协商确认可能存在 PCID冲突，服务基站为中继站分配一个新的 PCID, 在中继站启用新的 PCID后再切换到目标基站上，能够提前识别并避免 PCID冲突，避免网络切换中的干扰。进一步的，该实施例中目标基站能够更改中继站所使用的频率，中继站可以在切换前或者切换后更改所使用的频率。 In this embodiment, before the relay station switches to the target base station, the serving base station negotiates with the target base station to confirm that there may be a PCID collision, and the serving base station allocates a new PCID to the relay station, and then switches to the target base station after the relay station enables the new PCID. Identify and avoid PCID conflicts in advance to avoid interference in network switching. Further, in this embodiment, the target base station can change the frequency used by the relay station, and the relay station can change the used frequency before or after the handover.

上述新的第一频率和新的第二频率可以是一个载波的工作频率，也可以是多个载波的工作频率。特别地对于应用了载波汇聚的 LTE-A***，服务站和终端间的工作频率可以在多个载波上，具体地上述新第一频率工作频率（月良务站和终端间）可以是 1个载波的频率如 F1 (即该载波的中心频点）或者多个载波的频率如 F3, F4和 F5。上述新第二频率工作频率（用于中继和基站间）可以是 1个载波的频率如 F1 (即该载波的中心频点）或者多个载波的频率如 F3, F4和 F5。 LTE-A中载波汇聚 (carriers aggregation)是指两个或多个 component carriers (部分载波）汇聚在一起，以支持大于 20MHz的传输带宽。根据其能力，终端可以同时接收一个或多个 component carrier. LTE-A终端可以同时接收多个 component carriers的传输， LTE终端则只能接收一个 component carriers。中继站能够可以同时接收多个 component carriers的传输。 The new first frequency and the new second frequency may be the operating frequency of one carrier, or may be the operating frequency of multiple carriers. In particular, for an LTE-A system to which carrier aggregation is applied, the operating frequency between the service station and the terminal may be on multiple carriers, specifically, the new first frequency operating frequency (between the monthly service station and the terminal) may be one. The frequency of the carrier is F1 (ie, the center frequency of the carrier) or the frequencies of multiple carriers such as F3, F4 and F5. The above new second frequency operating frequency (for use between the relay and the base station) may be a frequency of one carrier such as F1 (i.e., the center frequency of the carrier) or frequencies of multiple carriers such as F3, F4 and F5. Carrier aggregation in LTE-A refers to the convergence of two or more component carriers to support a transmission bandwidth greater than 20 MHz. According to its capability, the terminal can receive one or more component carriers at the same time. The LTE-A terminal can receive transmissions of multiple component carriers at the same time, and the LTE terminal can only receive one component carrier. A relay station can receive transmissions of multiple component carriers simultaneously.

如图 6所示，在另一种实现方式中，步骤 S506中继站与其下属终端交互，通知其下属终端利用新 PCID接入该中继站，可以包含以下步骤： As shown in FIG. 6, in another implementation manner, in step S506, the relay station interacts with its subordinate terminal to notify the subordinate terminal to access the relay station by using the new PCID, which may include the following steps:

S601 : 中继站向终端发送第二切换指示信息，用于指示终端其归属的中继站不变，但中继站的 PCID和通信的第一频率 fl变更了，不执行切换流程。所述第二切换指示信息中包含指示信息，新 PCID和新第一频率。指示信息表示不需要进行网络切换。第一频率为中继站与终端之间通信的频率。 S601: The relay station sends the second handover indication information to the terminal, and is used to indicate that the relay station to which the terminal belongs is unchanged, but the PCID of the relay station and the first frequency fl of the communication are changed, and the handover procedure is not performed. The second handover indication information includes indication information, a new PCID, and a new first frequency. The indication message indicates that no network switching is required. The first frequency is the frequency of communication between the relay station and the terminal. Rate.

在第二种方案中第二切换指示信息可以包含：指示信息，新 PCID, 新第一频率和更改时间。用于通知终端：中继站将在更改时间到达时使用新第一频率发送新 PCID。 In the second scheme, the second handover indication information may include: indication information, a new PCID, a new first frequency, and a change time. Used to inform the terminal: The relay station will send a new PCID with the new first frequency when the change time arrives.

S602: 终端从第二切换指示信息中获得指示信息，新 PCID, 新第一频率； S602: The terminal obtains the indication information, the new PCID, and the new first frequency from the second handover indication information.

终端根据指示信息、新 PCID和新第一频率获知归属的中继站不变，但中继站的 PCID和通信频率发生了变化，无需网络切换。 The terminal learns that the home relay station does not change according to the indication information, the new PCID, and the new first frequency, but the PCID and the communication frequency of the relay station change, and no network handover is required.

在第二种方案中，终端从第二切换指示信息中获得指示信息，新 PCID, 新第一频率和更改时间。 In the second scheme, the terminal obtains indication information, a new PCID, a new first frequency, and a change time from the second handover indication information.

S603: 更新与新 PCID、新第一频率相关的信息； S603: Update information related to the new PCID and the new first frequency;

终端根据指示信息获知终端的中继站不变，但中继站的 PCID发生了变化，不需要进行网络切换。终端变更与 PCID相关的内容，例如***内扰码生成过程中与 PCID相关的信息等；利用新第一频率更新搜索和接收 PCID 的第一频率，以便与中继站进行同步。 The terminal learns that the relay station of the terminal does not change according to the indication information, but the PCID of the relay station changes, and no network switching is required. The terminal changes the content related to the PCID, such as information related to the PCID during the scrambling code generation in the system, etc.; searches and receives the first frequency of the PCID with the new first frequency to synchronize with the relay station.

在第二种方案中，终端在更改时间到达时，变更与新 PCID相关的内容，如***内扰码生成过程中与 PCID相关的信息等；利用新第一频率更新搜索和接收 PCID的第一频率，以便与中继站进行同步。 In the second scheme, the terminal changes the content related to the new PCID when the change time arrives, such as information related to the PCID in the scrambling code generation process in the system, and the first to update and search the PCID by using the new first frequency. Frequency to synchronize with the relay.

另外终端还可以利用该新 PCID、新第一频率与原中继站进行同步。对应地，中继站变更并发送新 PCID; 在另一种实施方式中，中继站在变更时间到达时，变更并发送自身的 PCID。另外中继站还会变更***内与 In addition, the terminal can also synchronize with the original relay station by using the new PCID and the new first frequency. Correspondingly, the relay station changes and transmits a new PCID. In another embodiment, the relay station changes and transmits its own PCID when the change time arrives. In addition, the relay station will also change the system and

S604: 可选的 , 终端向中继站发送 UE— PCID更改确认消息。 S604: Optionally, the terminal sends a UE-PCID change confirmation message to the relay station.

步骤 S603与步骤 S604之间无严格的执行顺序，可以按任意顺序执行。该实施例中，在中继站 PCID 以及中继站与终端的通信频率发生变化时，中继站向其下属的终端发送指示信息，指示下属的终端仅更改 PCID与通信频率但不进行切换，优化切换流程，提高切换效率，节约了网络资源。 There is no strict execution order between step S603 and step S604, and it can be executed in any order. In this embodiment, when the relay station PCID and the communication frequency of the relay station and the terminal change, the relay station sends indication information to the subordinate terminal, instructing the subordinate terminal to change only the PCID and the communication frequency but does not perform handover, optimize the handover procedure, and improve the handover. Efficiency, saving network resources.

如图 7所示，在另一种实现方式中，步骤 S506中继站与其下属终端交互，通知其下属终端利用新 PCID接入该中继站，可以包含以下步骤： S701 : 中继站向终端发送第二切换指示信息，用于指示终端其归属的中继站不变，但中继站的 PCID变更了，不执行切换流程。所述第二切换指示信息中包含指示信息，新 PCID。指示信息表示不需要进行网络切换。 As shown in FIG. 7, in another implementation manner, in step S506, the relay station interacts with its subordinate terminal to notify the subordinate terminal to access the relay station by using the new PCID, which may include the following steps: S701: The relay station sends the second handover indication information to the terminal, and is used to indicate that the relay station to which the terminal belongs is unchanged, but the PCID of the relay station is changed, and the handover procedure is not performed. The second handover indication information includes indication information, a new PCID. The indication message indicates that no network switching is required.

S702: 终端从第二切换指示信息中获得指示信息，新 PCID; S702: The terminal obtains indication information, a new PCID, from the second handover indication information.

终端根据指示信息和新 PCID 获知归属的中继站不变，但中继站的 PCID发生了变化，无需网络切换。 The terminal learns that the home relay station does not change according to the indication information and the new PCID, but the PCID of the relay station changes, and no network handover is required.

S703: 利用新 PCID更新与 PCID相关的信息； S703: update the information related to the PCID by using the new PCID;

终端根据指示信息获知终端归属的中继站不变，但中继站的 PCID发生了变化，不需要进行网络切换。终端变更与 PCID相关的内容，例如***内扰码生成过程中与 PCID相关的信息等。 The terminal learns that the relay station to which the terminal belongs is unchanged according to the indication information, but the PCID of the relay station changes, and no network switching is required. The terminal changes the content related to the PCID, such as information related to the PCID during the scrambling code generation process in the system.

对应地，中继站变更并发送新 PCID; 在另一种实施方式中，中继站在变更时间到达时，变更并发送自身的 PCID。另外中继站还会变更***内与 PCID相关的信息，如利用新 PCID生成新 4尤码序列等。 Correspondingly, the relay station changes and transmits a new PCID. In another embodiment, the relay station changes and transmits its own PCID when the change time arrives. In addition, the relay station also changes the information related to the PCID in the system, such as generating a new 4 special code sequence using the new PCID.

S704: 终端向中继站发送 UE— PCID更改确认消息。 S704: The terminal sends a UE-PCID change confirmation message to the relay station.

S705: 中继站向终端发送第三切换指示信息，用于指示终端其归属的中继站不变，但中继站与终端通信的第一频率 fl变更了。所述第二切换指示信息中包含指示信息和新第一频率。指示信息表示不需要进行网络切换。第一频率为中继站与终端之间通信的频率。 S705: The relay station sends third handover indication information to the terminal, where the relay station to which the terminal belongs is unchanged, but the first frequency fl of the relay station communicating with the terminal is changed. The second switching indication information includes indication information and a new first frequency. The indication message indicates that no network switching is required. The first frequency is the frequency of communication between the relay station and the terminal.

在第二种方案中第三切换指示信息可以包含：指示信息，新第一频率和更改时间。用于通知终端：中继站将在更改时间到达时使用新第一频率。 In the second scheme, the third handover indication information may include: indication information, a new first frequency, and a change time. Used to inform the terminal: The relay station will use the new first frequency when the change time arrives.

S706: 终端从第三切换指示信息中获得指示信息，新第一频率；终端根据指示信息、新第一频率获知归属的中继站不变，但中继站与终端的通信频率发生了变化，无需网络切换。 S706: The terminal obtains the indication information from the third handover indication information, the new first frequency; the terminal learns that the home relay station does not change according to the indication information, the new first frequency, but the relay station and the relay station The communication frequency of the terminal has changed, and no network switching is required.

在第二种方案中，终端从第二切换指示信息中获得指示信息，新第一频率和更改时间。 In the second scheme, the terminal obtains the indication information, the new first frequency, and the change time from the second handover indication information.

S707: 利用新第一频率更新与第一频率相关的信息； S707: Update the information related to the first frequency by using the new first frequency;

终端根据指示信息获知归属的中继站不变，但与中继站通信频率发生了变化，不需要进行网络切换，则利用新第一频率更新第一频率，以便与中继站进行同步。 The terminal learns that the home relay station does not change according to the indication information, but the communication frequency with the relay station changes, and the network switching is not required, and the first frequency is updated with the new first frequency to synchronize with the relay station.

在第二种方案中，终端在更改时间到达时，利用新第一频率更新 PCID 的第一频率。 In the second scheme, the terminal updates the first frequency of the PCID with the new first frequency when the change time arrives.

进一步的，终端采用新第一频率，与中继站进行同步。 Further, the terminal adopts a new first frequency and synchronizes with the relay station.

终端不必每帧都解析 PCID进行同步，第一频率变化后，终端可以立即进行同步，也可以在认为必要时解析中继站的 PCID, 与中继站进行同步。 The terminal does not have to parse the PCID for synchronization every frame. After the first frequency changes, the terminal can synchronize immediately, or can analyze the PCID of the relay station when necessary, and synchronize with the relay station.

S708：终端向中继站发送终端频率 UE— F更改确认消息。 S708: The terminal sends a terminal frequency UE-F change confirmation message to the relay station.

显然的，上述流程中的步骤并不要求有严格的时间先后，在一种实施方式中可以顺序的执行 S701至步骤 S706, 中继站将新 PCID和新 fl通知给终端；在另一种实施方式中，可以先执行步骤 S704至步骤 S706的流程，中继站将新 fl通知给终端，再执行步骤 S701至步骤 S703的流程，中继站将新 PCID通知给终端；或者可以并行执行步骤 S701至步骤 S703的流程与步骤 S704至步骤 S706的流程，将将新 PCID和新 fl通知给终端。 Obviously, the steps in the foregoing process do not require strict time sequence. In an implementation manner, S701 to step S706 may be sequentially performed, and the relay station notifies the terminal of the new PCID and the new fl; in another embodiment, The process of step S704 to step S706 may be performed first, the relay station notifies the terminal of the new fl, and then the process of step S701 to step S703 is performed, the relay station notifies the terminal of the new PCID; or the flow of step S701 to step S703 may be performed in parallel. The flow of step S704 to step S706 will notify the terminal of the new PCID and the new fl.

在另一种实施方式中，步骤 S506中继站与其下属终端交互，通知其下属终端利用新 PCID接入该中继站，可以包含步骤 S701至步骤 S703的流程，进一步的，在步骤 510: 中继站成功接入到目标站点之后，还包括步骤 S704 至步骤 S706的流程。即中继站可以在切换到目标基站之前修改与终端通信的第一频率，也可以在切换到目标基站之后修改与终端通信的第二频率。 In another embodiment, in step S506, the relay station interacts with its subordinate terminal to notify the subordinate terminal to access the relay station by using the new PCID, and may include the process of step S701 to step S703. Further, in step 510: the relay station successfully accesses the relay station. After the target site, the process of step S704 to step S706 is further included. That is, the relay station can modify the first frequency to communicate with the terminal before switching to the target base station, or modify the second frequency to communicate with the terminal after switching to the target base station.

该实施例中 ,在服务基站为中继站分配一个新的 PCID时，中继站向其下属的终端发送指示信息，指示下属的终端仅更改 PCID但不进行切换，采用单独的消息将新的第一频率信息通知给终端，优化切换流程，提高切换效率，节约了网络资源。 In this embodiment, when the serving base station allocates a new PCID to the relay station, the relay station sends indication information to the subordinate terminal, indicating that the subordinate terminal only changes the PCID but does not perform handover, and uses a separate message to send the new first frequency information. Notify the terminal, optimize the switching process, improve the switching efficiency, and save network resources.

参考图 8, 本发明的一种切换方法的另一个实施例，包括： S801 : 中继站发送第一切换请求消息给服务基站，其中包含了切换的一个或者多个候选目标基站。 Referring to FIG. 8, another embodiment of a handover method of the present invention includes: S801: The relay station sends a first handover request message to the serving base station, where the one or more candidate target base stations of the handover are included.

S802: 服务基站根据第一切换请求消息做出切换决定，并向目标基站发送切换请求，该切换请求中包含协商消息，用于与服务基站协商是否会存在 PCID冲突；协商消息包含中继站的 PCID; S802: The serving base station sends a handover request according to the first handover request message, and sends a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the serving base station whether there is a PCID conflict; the negotiation message includes the PCID of the relay station;

服务基站通过协商消息与目标基站协商，了解如果中继切换到目标基站后，在目标基站中是否会存在 PCID 冲突。服务基站可以在切换请求中携带协商消息，实现与现有协议的兼容，也可以直接向目标基站发送协商消息。 The serving base station negotiates with the target base station through the negotiation message to know whether there is a PCID collision in the target base station after the relay is handed over to the target base station. The serving base station may carry the negotiation message in the handover request to implement compatibility with the existing protocol, or may directly send the negotiation message to the target base station.

该切换请求消息中还包含频率信息，频率信息可以包含第一频率，也可以包含第一频率和第二频率，其中第一频率为中继站与终端通信使用的频率，第二频率为中继站与服务基站通信使用的频率。当然，服务基站也可以采用一条消息发送频率信息。 The switching request message further includes frequency information, where the frequency information may include the first frequency, and may also include the first frequency and the second frequency, where the first frequency is a frequency used by the relay station to communicate with the terminal, and the second frequency is a relay station and a serving base station. The frequency used for communication. Of course, the serving base station can also use a message sending frequency information.

步骤 S803至 S810的流程与上一个实施例中步骤 S503至 S510的流程类似，在此不予赘述。 The processes of steps S803 to S810 are similar to the processes of steps S503 to S510 in the previous embodiment, and are not described herein.

该实施例中，在中继站切换到目标基站前，服务基站与目标基站协商确认可能存在 PCID冲突，服务基站为中继站分配一个新的 PCID, 在中继站站启用新的 PCID后再切换到目标基站上，能够提前识别并避免 PCID冲突，避免网络切换中的干扰。进一步的，该实施例中目标基站能够更改中继站所使用的频率，中继站可以在切换前或者切换后更改所使用的频率。本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体In this embodiment, before the relay station switches to the target base station, the serving base station negotiates with the target base station to confirm that there may be a PCID collision, the serving base station allocates a new PCID to the relay station, and then switches to the target base station after the relay station station enables the new PCID. It can identify and avoid PCID conflicts in advance and avoid interference in network switching. Further, in this embodiment, the target base station can change the frequency used by the relay station, and the relay station can change the used frequency before or after the handover. One of ordinary skill in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored. In a computer readable storage medium, the program, when executed, may include the flow of an embodiment of the methods as described above. The storage medium may be a magnetic disk, an optical disk, or a read-only storage memory.

( Read-Only Memory, (Read-Only Memory,

RAM )等。本发明还提供一种切换装置实施例，用于在其下属的中继站切换到目标基站时提前识别并解决网络中的标识冲突。该切换装置可为基站。在获知中继站需要进行网络切换时，中继站的服务基站 eNBl首先确认中继站的原 PCID是否与目标基站中现有的 PCID相同；如果目标基站中存在一个中继站的 PCID与切换中继站的原 PCID相同，则服务基站 eNIB需要为切换中继站分配一个新的 PCID; 中继站在新的 PCID生效后切换到目标基站。 RAM) and so on. The present invention also provides an embodiment of a handover apparatus for identifying and resolving identity conflicts in a network in advance when a subordinate relay station switches to a target base station. The switching device can be a base station. When it is known that the relay station needs to perform network handover, the serving base station eNB1 of the relay station first confirms whether the original PCID of the relay station is the same as the existing PCID in the target base station; if the PCID of one relay station in the target base station is the same as the original PCID of the handover relay station, the service The base station eNIB needs to allocate a new PCID to the handover relay station; the relay station switches to the target base station after the new PCID is valid.

如图 9所示，本发明提供的一种基站的一个实施例，包括： As shown in FIG. 9, an embodiment of a base station provided by the present invention includes:

切换确定单元 901 : 用于获得中继站需要切换到目标基站的决定；发送单元 902, 用于向目标基站发送切换请求，该切换请求中包含协商消息，用于与服务基站协商是否会 PCID冲突； The determining unit 901 is configured to obtain a decision that the relay station needs to be handed over to the target base station, and the sending unit 902 is configured to send a handover request to the target base station, where the handover request includes a negotiation message, and is used to negotiate with the serving base station whether the PCID conflicts;

接收单元 903 , 用于接收目标基站的切换响应，该切换请求响应中包含响应协商消息生成的 PCID列表； The receiving unit 903 is configured to receive a handover response of the target base station, where the handover request response includes a PCID list generated by the response negotiation message;

分配单元 904, 用于根据 PCID列表为中继站分配一个新 PCID; An allocating unit 904, configured to allocate a new PCID to the relay station according to the PCID list;

通知单元 905 , 用于向中继站发送 PCID更改消息，该 PCID更改消息中包含新 PCID, 用于通知中继站使用新 PCID切换到目标基站中。 The notification unit 905 is configured to send a PCID change message to the relay station, where the PCID change message includes a new PCID, and is used to notify the relay station to switch to the target base station by using the new PCID.

该实施例中，在中继站切换到目标基站前，基站与目标基站协商确认可能存在 PCID冲突，基站为中继站分配一个新的 PCID, 中继站启用新的 PCID后再切换到目标基站上，能够提前识别并避免 PCID冲突，避免网络切换中的干扰。 In this embodiment, before the relay station switches to the target base station, the base station negotiates with the target base station to confirm that there may be a PCID conflict, and the base station allocates a new PCID to the relay station, and the relay station enables the new PCID and then switches to the target base station, which can be identified in advance. Avoid PCID conflicts and avoid interference in network switching.

如图 10所示，所述切换确定单元 901的一个实施例，包括：测量报告接收单元 1001 , 用于接收中继站的测量报告； As shown in FIG. 10, an embodiment of the handover determining unit 901 includes: a measurement report receiving unit 1001, configured to receive a measurement report of a relay station;

确定单元 1002, 用于根据测量报告及无线资源管理信息决定中继站需要切换到目标基站。 The determining unit 1002 is configured to determine, according to the measurement report and the radio resource management information, that the relay station needs to switch to the target base station.

如图 11所示，所述切换确定单元 901的另一个实施例，包括：切换请求接收单元 1101 , 用于接收中继站的切换请求消息，该切换请求消息中包括切换的一个或多个候选目标基站； As shown in FIG. 11, another embodiment of the handover determining unit 901 includes: The handover request receiving unit 1101 is configured to receive a handover request message of the relay station, where the handover request message includes one or more candidate target base stations that are handed over;

决定单元 1102, 用于根据第一切换请求做出切换决定，并从候选目标基站中选择一个目标基站。 The determining unit 1102 is configured to make a handover decision according to the first handover request, and select one target base station from the candidate target base stations.

在另一个实施方式中，所述切换请求中还包括：频率信息；切换请求响应中还包括：新频率信息；所述通知单元还用于向中继站发送频率更改消息，该频率更改消息包含新频率信息。 In another embodiment, the handover request further includes: frequency information; the handover request response further includes: new frequency information; the notification unit is further configured to send a frequency change message to the relay station, where the frequency change message includes a new frequency information.

如图 12所示，本发明提供的一种基站的另一个实施例，包括：切换确定单元 1201: 用于获得中继站需要切换到目标基站的决定；发送单元 1202, 用于向目标基站发送切换请求，该切换请求中包含协商消息，用于与服务基站协商是否会存在 PCID冲突； As shown in FIG. 12, another embodiment of a base station provided by the present invention includes: a handover determining unit 1201: configured to obtain a decision that a relay station needs to handover to a target base station; and a sending unit 1202, configured to send a handover request to a target base station The switching request includes a negotiation message, and is used to negotiate with the serving base station whether there is a PCID conflict;

接收单元 1203 , 用于接收目标基站的切换响应，该切换请求响应中包含响应协商消息生成的 PCID列表； The receiving unit 1203 is configured to receive a handover response of the target base station, where the handover request response includes a PCID list generated by the response negotiation message;

分配单元 1204, 用于根据 PCID列表为中继站分配一个新 PCID; The allocating unit 1204 is configured to allocate a new PCID to the relay station according to the PCID list;

通知单元 1205 ,用于向中继站发送 PCID更改消息，该 PCID更改消息中包含新 PCID, 用于通知中继站使用新 PCID切换到目标基站中 The notification unit 1205 is configured to send a PCID change message to the relay station, where the PCID change message includes a new PCID, and is used to notify the relay station to switch to the target base station by using the new PCID.

确认接收单元 1206, 用于接收中继站发送的 PCID更改确认消息；信息发送单元 1207, 用于将切换到目标基站的信息发送给中继站。该实施例中，在中继站切换到目标基站前，基站与目标基站协商确认可能存在 PCID冲突，基站为中继站分配一个新的 PCID, 中继站启用新的 The acknowledgment receiving unit 1206 is configured to receive a PCID change confirmation message sent by the relay station, and the information sending unit 1207 is configured to send information about the handover to the target base station to the relay station. In this embodiment, before the relay station switches to the target base station, the base station negotiates with the target base station to confirm that there may be a PCID collision, and the base station allocates a new PCID to the relay station, and the relay station enables a new one.

PCID后再切换到目标基站上，能够提前识别并避免 PCID冲突，避免网络切换中的干扰。总之，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、改进等，均应包含在本发明的保护范围之内。 After the PCID is switched to the target base station, the PCID conflict can be identified and avoided in advance, and interference in the network handover can be avoided. In conclusion, the above description is only the preferred embodiment of the present invention and is not intended to limit the scope of 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.

Claims

权利要求书 Claim

1、一种切换方法，包括： 1. A switching method, comprising:

根据 PCID列表为中继站分配一个新 PCID, 并向中继站发送 PCID更改消息 , 该 PCID更改消息中包含新 PCID , 用于通知中继站使用新 PCID 切换到目标基站中。 The relay station is assigned a new PCID according to the PCID list, and a PCID change message is sent to the relay station. The PCID change message includes a new PCID for instructing the relay station to switch to the target base station using the new PCID.

2、根据权利要求 1所述的方法，其特征在于，获得中继站需要切换到目标基站的决定包括： 2. The method of claim 1 wherein the determining that the relay station needs to handover to the target base station comprises:

接收中继站的测量报告； Receiving a measurement report of the relay station;

根据测量报告及无线资源管理信息决定中继站需要切换到目标基站。 According to the measurement report and the radio resource management information, the relay station needs to switch to the target base station.

3、根据权利要求 1所述的方法，其特征在于，获得中继站需要切换到目标基站的决定包括： 3. The method according to claim 1, wherein the determining that the relay station needs to handover to the target base station comprises:

接收中继站的第一切换请求消息，该第一切换请求消息中包括切换的一个或多个候选目标基站列表； Receiving a first handover request message of the relay station, where the first handover request message includes one or more candidate target base station lists for handover;

根据第一切换请求做出切换决定，并从候选目标基站中选择一个目标基站。 A handover decision is made according to the first handover request, and one target base station is selected from the candidate target base stations.

4、根据权利要求 1所述的方法，其特征在于，所述切换请求中还包括：频率信息；切换请求响应中还包括：新频率信息；所述方法还包括： The method according to claim 1, wherein the handover request further includes: frequency information; the handover request response further includes: new frequency information; the method further includes:

向中继站发送频率更改消息，该频率更改消息包含新频率信息。 A frequency change message is sent to the relay station, the frequency change message containing new frequency information.

5、根据权利要求 1所述的方法，其特征在于，还包括： 5. The method according to claim 1, further comprising:

接收中继站发送的 PCID更改确认消息； Receiving a PCID change confirmation message sent by the relay station;

发送切换指令消息给中继站，提供中继站切换到目标基站的信息。 A handover command message is sent to the relay station, providing information that the relay station switches to the target base station.

6、根据权利要求 1所述的方法，其特征在于，根据 PCID列表为中继站分配一个新 PCID, 包括：从 PCID列表中选择一个 PCID作为新 PCID；或 6. The method according to claim 1, wherein assigning a new PCID to the relay station according to the PCID list comprises: Select a PCID from the PCID list as the new PCID; or

为中继站分配一个与 PCID列表中 PCID不同的新 PCID。 Assign a new PCID to the repeater that is different from the PCID in the PCID list.

7、根据权利要求 1所述的方法，其特征在于，还包括：中继站与其下属终端交互，通知其下属终端利用新 PCID接入该中继站。 7. The method according to claim 1, further comprising: the relay station interacting with its subordinate terminal to notify its subordinate terminal to access the relay station by using a new PCID.

8、根据权利要求 7所述的方法，其特征在于，中继站与其下属终端交互，通知其下属终端利用新 PCID接入该中继站，包括： The method according to claim 7, wherein the relay station interacts with its subordinate terminal to notify the subordinate terminal to access the relay station by using the new PCID, including:

中继站向终端发送第二切换指示信息，用于指示终端变更 PCID但不执行切换流程，所述第二切换指示信息中包含指示信息，新 PCID, 该指示信息表示归属的服务站点不变； The relay station sends the second handover indication information to the terminal, and is used to instruct the terminal to change the PCID but does not perform the handover procedure. The second handover indication information includes indication information, a new PCID, and the indication information indicates that the home service station does not change;

中继站发送新 PCID , 终端利用新 PCID与中继站同步； The relay station transmits a new PCID, and the terminal synchronizes with the relay station by using the new PCID;

接收终端发送的 PCID更改确认。 Receive PCID change confirmation sent by the terminal.

9、根据权利要求 7所述的方法，其特征在于，中继站与其下属终端交互，通知其下属终端利用新 PCID接入该中继站，包括： The method according to claim 7, wherein the relay station interacts with its subordinate terminal to notify the subordinate terminal to access the relay station by using the new PCID, including:

中继站向终端发送第二切换指示信息，用于指示终端变更 PCID但不执行切换流程，所述第二切换指示信息中包含指示信息，新 PCID, 新的第一频率，该指示信息表示归属的服务站点不变； The relay station sends the second handover indication information to the terminal, and is used to instruct the terminal to change the PCID but does not perform the handover procedure. The second handover indication information includes indication information, a new PCID, and a new first frequency, where the indication information indicates the home service. The site remains unchanged;

中继站在新的第一频率发送新 PCID ,终端利用新 PCID与中继站同步；接收终端发送的 PCID更改确认。 The relay station transmits a new PCID at the new first frequency, and the terminal synchronizes with the relay station by using the new PCID; the PCID change confirmation sent by the receiving terminal.

10、根据权利要求 9所述的方法，其特征在于，还包括：中继站将新 PCID和新第一频率通知给周边邻居小区，让邻居小区更新其各自的邻居小区列表。 10. The method of claim 9, further comprising: the relay station notifying the neighboring cell of the new PCID and the new first frequency, and causing the neighbor cell to update its respective neighbor cell list.

11、根据权利要求 1所述的方法，其特征在于，还包括： 11. The method according to claim 1, further comprising:

中继站将新 PCID通知给邻居周边小区 ,让邻居小区更新其各自的邻居小区列表。 The relay station notifies the neighboring cell of the new PCID, and causes the neighbor cell to update its respective neighbor cell list.

12、一种基站，其特征在于，包括： 12. A base station, comprising:

接收单元，用于接收目标基站的切换响应，该切换请求响应中包含响应协商消息生成的 PCID列表，所述 PCID列表包含至少一个 PCID; a receiving unit, configured to receive a handover response of the target base station, where the handover request response includes The PCID list generated by the message should be negotiated, and the PCID list includes at least one PCID;

通知单元，用于向中继站发送 PCID更改消息，该 PCID更改消息中包含新 PCID, 用于通知中继站使用新 PCID切换到目标基站中。 The notification unit is configured to send a PCID change message to the relay station, where the PCID change message includes a new PCID, and is used to notify the relay station to switch to the target base station by using the new PCID.

13、根据权利要求 12所述的基站，其特征在于，所述切换确定单元包括： The base station according to claim 12, wherein the handover determining unit comprises:

测量报告接收单元，用于接收中继站的测量报告； a measurement report receiving unit, configured to receive a measurement report of the relay station;

确定单元，用于根据测量报告及无线资源管理信息决定中继站需要切换到目标基站。 And a determining unit, configured to determine, according to the measurement report and the radio resource management information, that the relay station needs to switch to the target base station.

14、根据权利要求 12所述的基站，其特征在于，所述切换确定单元包括： The base station according to claim 12, wherein the handover determining unit comprises:

切换请求接收单元，用于接收中继站的第一切换请求消息，该第一切换请求消息中包括切换的一个或多个候选目标基站； a handover request receiving unit, configured to receive a first handover request message of the relay station, where the first handover request message includes one or more candidate target base stations that are handed over;

决定单元，用于根据第一切换请求做出切换决定，并从候选目标基站中选择一个目标基站。 And a determining unit, configured to make a handover decision according to the first handover request, and select one target base station from the candidate target base stations.

15、根据权利要求 12所述的基站，其特征在于，所述切换请求中还包括：频率信息；切换请求响应中还包括：新频率信息；所述通知单元还用于向中继站发送频率更改消息，该频率更改消息包含新频率信息。 The base station according to claim 12, wherein the handover request further includes: frequency information; the handover request response further includes: new frequency information; the notification unit is further configured to send a frequency change message to the relay station. , the frequency change message contains new frequency information.

16、根据权利要求 12所述的基站，其特征在于，还包括： The base station according to claim 12, further comprising:

确认接收单元，用于接收中继站发送的 PCID更改确认消息；信息发送单元，用于将切换到目标基站的信息发送给中继站。 The acknowledgment receiving unit is configured to receive a PCID change confirmation message sent by the relay station, and the information sending unit is configured to send the information that is switched to the target base station to the relay station.