Method and system for terminal handover in wireless communication system

Patent metadata

Field	Value
Publication number	US-9301229-B2
Application number	US-201013581325-A
Country	US
Kind code	B2
Filing date	Oct 21, 2010
Priority date	Mar 8, 2010
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

A method and system for terminal switching in a wireless communication system are disclosed. A terminal accesses a packet data network through a packet data network gateway, when the terminal switches between gateways, the target gateway to which the terminal switches allocates a new Routing Identifier (RID) to the terminal, and stores a mapping relationship between the Access Identifier (AID) and the new RID of the terminal. The target gateway or the target mobility management entity (MME) of the terminal initiates a registration update request including the new RID of the terminal to the home Identity Location Register (ILR) of the terminal. After receiving the request, the home ILR of the terminal updates the stored AID-RID mapping information of the terminal according to the new RID of the terminal, and initiates a notification for updating the RID of the terminal to the opposite gateway and/or the opposite MME.

First claim

What is claimed is:

1. A method for terminal handover in a wireless communication system in which a packet data network gateway and/or a mobility management entity is connected to an Identity Location Register (ILR) through a signaling interface, a terminal accessing a packet data network through a packet data network gateway, and when the terminal moves between two packet data network gateways, the method comprising:
a target packet data network gateway to which the terminal moves allocating a new Routing Identifier (RID) to the terminal, and storing a mapping relationship between an Access Identifier (AID) and the new RID of the terminal; the target packet data network gateway or a target mobility management entity of the terminal initiating a registration update request including the new RID of the terminal to a home ILR of the terminal;
after receiving the registration update request, the home ILR of the terminal updating stored AID-RID mapping information of the terminal according to the new RID of the terminal, and initiating a notification of updating the RID of the terminal to packet data network gateway of an opposite communication end and/or mobility management entity of an opposite communication end of the terminal according to end information of the opposite communication end of the terminal which is received and/or stored locally.

2. The method according to claim 1 , wherein,
the step of initiating a registration update request comprises: after allocating the new RID to the terminal, the target packet data network gateway directly initiating the registration update request to the home ILR of the terminal; or, the target packet data network gateway sending the new RID to the target mobility management entity, and the target mobility management entity initiating the registration update request to the home ILR of the terminal.

3. The method according to claim 2 , wherein,
after the terminal moves, the source packet data network gateway of the terminal and/or target packet data network gateway delivers the end information of the opposite communication end of the terminal to the home ILR of the terminal directly or via a mobility management entity;
the home ILR of the terminal initiates the notification of updating the RID of the terminal according to the received end information of the opposite communication end of the terminal and the registration update request.

4. The method according to claim 3 , wherein,
when the target packet data network gateway initiates the RID registration request, or sends the new RID to the target mobility management entity, the maintained end information of the opposite communication end of the terminal is included;
after receiving the new RID and the end information of the opposite communication end, the end information of the opposite communication end is included when the target mobility management entity initiates the RID registration request;
after receiving the RID registration request, the home ILR of the terminal initiates the notification of updating the RID of the terminal according to the end information of the opposite communication end included in the RID registration request.

5. The method according to claim 3 , wherein,
the source packet data network gateway and/or target packet data network gateway sets a delivery timer when establishing a forwarding tunnel, and when the delivery timer times out, deliver the maintained end information of the opposite communication end of the terminal to the home ILR of the terminal; or,
when the established forwarding tunnel is released, the source packet data network gateway and/or target packet data network gateway delivers the maintained end information of the opposite communication end of the terminal to the home ILR of the terminal.

6. The method according to claim 5 , wherein,
when delivering the end information of the opposite communication end of the terminal to the home ILR of the terminal, the source packet data network gateway and/or target packet data network gateway notify the home ILR of the terminal to initiate a RID update notification; or identify the delivered end information of the opposite communication end as end information of the opposite communication end to initiate the RID update notification;
after receiving the end information of the opposite communication end the home ILR of the terminal initiates the notification of updating the RID of the terminal according to the notification of initiating RID update notification or the identifier of initiating RID update notification.

7. The method according to claim 1 , further comprising:
when the home ILR of the terminal only initiates the notification of updating the RID of the terminal to the mobility management entity of the opposite communication end of the terminal, the mobility management entity of the opposite communication end forwarding the notification to the packet data network gateway of the opposite communication end after receiving the notification;
upon receiving the notification of updating the RID of the terminal sent by the home ILR or the opposite mobility management entity of the terminal, the packet data network gateway of the opposite communication end updating the AID-RID information of the terminal.

8. The method according to claim 1 , the method further comprising:
before a handover, an source packet data network gateway of the terminal delivering the end information of the opposite communication end of the terminal to the home ILR of the terminal directly or through an source mobility management entity, and the home ILR of the terminal locally storing the end information of the opposite communication end of the terminal;
after receiving the registration update request, the home ILR of the terminal initiating the notification of updating the RID of the terminal according to the locally stored end information of the opposite communication end of the terminal.

9. The method according to claim 8 , after the terminal moves, the method further comprising: the source packet data network gateway transmitting changed end information of the opposite communication end to the home ILR of the terminal, and identifying the changed end information of the opposite communication end as end information of the opposite communication end to initiate RID update;
after receiving the end information of the opposite communication end identified to initiate RID update, the home ILR of the terminal initiating the notification of updating the RID of the terminal to the corresponding packet data network gateway of the opposite communication end; and,
the source packet data network gateway delivering the changed end information of the opposite communication end to the home ILR of the terminal in the following way:
after receiving a Create Indirect Data Forwarding Tunnel Request of the target packet data network gateway, if judging that there is end information of the opposite communication end changed after a last delivery, the source packet data network gateway delivering the changed end information of the opposite communication end to the home ILR of the terminal; or,
if judging that there is end information of the opposite communication end changed after a last delivery when releasing a forwarding tunnel, the source packet data network gateway delivering the changed end information of the opposite communication end to the home ILR of the terminal once; or,
after receiving the Create Indirect Data Forwarding Tunnel Request, the source packet data network gateway setting a delivery timer, and if judging when the delivery timer times out that there is end information of the opposite communication end changed after a last delivery, the source packet data network gateway

Assignees

• Zhou Na
• Wu Qiang
• Fu Tao
• Zte Corp

Inventors

• Zhou Na
• Wu Qiang
• Fu Tao

Classifications

• H04W8/26

  Network addressing or numbering for mobility support · CPC title

• H04L61/2084

  Electricity · mapped topic

• H04W88/16

  Gateway arrangements · CPC title

• H04W8/04

  Registration at HLR or HSS [Home Subscriber Server] · CPC title

• H04L61/103

  across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP] · CPC title