Method of performing and supporting handover in broadband wireless access system

• US 9,161,183 B2
• Filed: 04/11/2008
• Issued: 10/13/2015
• Est. Priority Date: 04/12/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Mun, Du Hyun, Kim, Yong Ho, Hahn, Gene Beck, Ryu, Ki Seon
• Primary Examiner(s): Renner, Brandon
• Assistant Examiner(s): Sciacca, Scott M
• Application Number:
  US12/595,789
• Publication Number:
  US 20100061289A1
• Time in Patent Office: 2,741 Days
• Field of Search: 370/312, 370/331, 455436-438
• US Class Current: 1/1
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 4/12 Messaging; Mailboxes; Announcements

Abstract

A method for performing a handover between MBS zones of a mobile station receiving multicast and broadcast service (MBS) data in a wireless access system is disclosed. The method for performing the handover between first and second MBS zones of the mobile station in a wireless access system includes receiving the MBS from a first base station belonging to the first MBS zone which uses a first MBS zone identifier (ID), requesting the handover between the first and second MBS zones, receiving parameter information including a second MBS zone identifier (ID), from the first base station, and receiving the MBS from a second base station belonging to the second MBS zone, using the parameter information, wherein the second MBS zone uses the second MBS zone identifier (ID) which is needed to receive the MBS.

Claims

1. A method for performing a handover between a first and second Multicast and Broadcast Service (MBS) zones in a wireless access system, the method comprising:

receiving, by a mobile station, MBS data from a first base station belonging to the first MBS zone, wherein a first MBS zone identifier (ID) is used for the first MBS zone;

receiving, by the mobile station, a broadcast message including downlink channel descriptors and uplink channel descriptors of neighboring base stations including a second base station belong to the second MBS zone from the first base station;

synchronizing with the neighboring base stations by using the at least one of a downlink channel descriptor and an uplink channel descriptor;

scanning the synchronized neighboring base stations;

determining to handover to the second base station based on a result of the scanning;

transmitting, by the mobile station, a handover request message to request the handover between the first and the second MBS zones;

receiving, by the mobile station, a handover response message including parameter information from the first base station; and

receiving, by the mobile station, the MBS data from the second base station, using the parameter information,

wherein the parameter information includes a second MBS zone identifier (ID), MBS capability information, a second base station ID, a multicast connection ID (CID), a logical flow identifier (ID) generated from a server of the second MBS zone, Media Access Control (MAC) Protocol Data Unit (PDU) size information of the second MBS zone and security information of the second MBS zone,

wherein the MBS capability information indicates whether the handover between the first and the second MBS zones is a macro-diversity handover, and

wherein the security information includes a multicast group key.

2. The method according to claim 1, wherein the parameter information has previously been transferred from the server of the second MBS zone to the first base station via a server of the first MBS zone, before the handover is completed.

3. The method according to claim 1, wherein the parameter information further includes MBS error parameter information.

4. The method according to claim 1, wherein the parameter information further includes location information of the MBS data.

5. The method according to claim 4, wherein the location information of the MBS data includes at least one of an MBS symbol offset indicating a location of the MBS data, a number of MBS symbols, an MBS sub-channel offset, a number of MBS sub-channels, and a burst attribute list.

6. The method according to claim 5, wherein the burst attribute list includes at least one of a burst symbol offset, a number of burst symbols, a burst subchannel offset, and a number of burst sub-channels.

7. The method according to claim 1, further comprising:

receiving, by the mobile station, a message including location information of the MBS data to receive the MBS data provided from the second MBS zone.