Handover method and system in relay network, relay node, control base station and base station

• US 8,781,477 B2
• Filed: 06/28/2012
• Issued: 07/15/2014
• Est. Priority Date: 12/31/2009
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zhang, Tao
• Primary Examiner(s): MILLER, BRANDON J
• Application Number:
  US13/535,924
• Publication Number:
  US 20120276910A1
• Time in Patent Office: 747 Days
• Field of Search: 455/436, 455/435.1, 455/432.1, 455/422.1, 370/331
• US Class Current: 455/439
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04W 36/0005 Control or signalling for completing the hand-off
• CPC Class Codes: H04W 36/165 for reducing network power consumption H04W36/18 - H04W36/22 take precedence
• CPC Class Codes: H04W 36/247 by using coverage extension
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 48/14 using user query or user detection
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

Embodiments of the present invention provide a handover method and system in a relay network, a relay node, a control base station and a base station. The method includes: receiving, by a relay node, a first area identifier that identifies the relay node; sending a system information broadcast message carrying the first area identifier to a terminal in a coverage area; receiving a handover request message forwarded by a control base station; and performing, according to the handover request message, a control operation of accessing the relay node on the terminal. The first area identifier that identifies the relay node is allocated to the relay node, so that the terminal in the relay network can be normally handed over from the base station to the relay node.

Claims

1. A handover method in a relay network, comprising:

receiving, by a relay node, an evolved universal terrestrial radio access network cell global identifier (ECGI) allocated by an operation administration and maintenance (OAM), wherein the ECGI is used to identify the relay node and includes an identifier of a control base station controlling the relay node;

broadcasting, by the relay node, the ECGI to a terminal in the coverage area of the relay node through a system information broadcast message;

obtaining, by a base station, the identifier of the control base station from the ECGI after receiving a measurement report carrying the ECGI sent by the terminal;

creating, by the base station, a handover required message carrying the identifier of the control base station obtained by the base station from the ECGI;

sending, by the base station, the handover required message to a mobility management entity (MME) so that the MME sends a handover request message carrying the ECGI to the control base station according to the identifier of the control base station carried in the handover required message.

2. A system for handover in a relay network, comprising:

a relay node, configured to receive an evolved universal terrestrial radio access network cell global identifier (ECGI) allocated by an operation administration and maintenance (OAM) and broadcast the ECGI to a terminal in the coverage area of the relay node through a system information broadcast message, wherein the ECGI is used to identify the relay node and includes an identifier of a control base station controlling the relay node; and

a base station, configured to after receiving a measurement report carrying the ECGI sent by the terminal, obtain the identifier of the control base station from the ECGI, create a handover required message carryin the identifier of the control base station obtained by the base station from the ECGI and send the handover required message to a mobility management entity (MME) so that the MME sends a handover request message carrying the ECGI to the control base station according to the identifier of the control base station carried in the handover required message.

3. A handover method in a relay network, comprising:

receiving, by a base station, a measurement report carrying an evolved universal terrestrial radio access network cell global identifier (ECGI) sent by a terminal, wherein the ECGI is used to identify a relay node and includes an identifier of a control base station controlling the relay node;

obtaining, by the base station, the ECGI from the measurement report;

obtaining, by the base station, the identifier of the control base station from the ECGI obtained from the measurement report;

creating, by the base station, a handover required message according to the measurement report wherein the handover required message carries the identifier of the control base station and the ECGI obtained by the base station;

sending, by the base station, the handover required message to a mobility management entity (MME) so that the MME sends a handover request message carrying the ECGI to the control base station according to the identifier of the control base station carried in the handover required message.

4. A base station, comprising:

a transceiver, configured to receive a measurement report carrying an evolved universal terrestrial radio access network cell global identifier (ECGI) sent by a terminal, wherein the ECGI is used to identify a relay node and includes an identifier of a control base station controlling the relay node;

a processor connected to the transceiver, configured to obtain the ECGI from the measurement report, obtain the identifier of the control base station from the obtained ECGI and create a handover required message according to the measurement report wherein the handover required message carries the obtained identifier of the control base station and the obtained ECGI;

the transceiver, further configured to send the handover required message to a mobility management entity (MME) so that the MME sends a handover request message carrying the ECGI to the control base station according to the identifier of the control base station carried in the handover required message.