Method of supporting operation of sleep mode in a wideband radio access system

• US 8,310,971 B2
• Filed: 12/21/2011
• Issued: 11/13/2012
• Est. Priority Date: 09/30/2004
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Beom Joon, Ryu, Ki Seon, Kim, Yong Ho, Lee, Chang Jae
• Primary Examiner(s): RAMPURIA, SHARAD K
• Application Number:
  US13/333,784
• Publication Number:
  US 20120087291A1
• Time in Patent Office: 328 Days
• Field of Search: 340 732- 735, 340 742- 746, 340/539.3, 370/331, 370/311, 375/354, 455/552.1, 455572-574, 4553431-3436, 455/436, 455/442
• US Class Current: 370/311
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method of indicating downlink traffic to a mobile subscriber station that is in a sleep mode includes transmitting a sleep request message to a base station (BS); entering the sleep mode in response to a sleep response message received from the BS, wherein the sleep response message includes a first SLPID; receiving a traffic indication message including a FMT field indicating formats for the traffic indication message from the BS during a listening interval of the sleep mode, wherein the FMT field indicates one of an SLPID bitmap based format and an SLPID based format, and the traffic indication message further includes a second SLPID when the SLPID based format is used; and terminating the sleep mode to receive the downlink traffic when the second SLPID in the traffic indication message is same as the first SLPID included in the sleep response message.

Claims

1. A method of indicating downlink traffic to a mobile subscriber station (MSS) that is in a sleep mode, the method comprising:

transmitting a sleep request (MOB-SLP-REQ) message to a base station (BS);

entering the sleep mode in response to a sleep response (MOB-SLP-RSP) message received from the BS, wherein the sleep response message includes a first sleep identifier (SLPID);

receiving a traffic indication (MOB-TRF-IND) message comprising a format (FMT) field indicating formats for the traffic indication message from the BS during a listening interval of the sleep mode, wherein the FMT field indicates that an SLPID bitmap based format or an SLPID based format is used for configuring the traffic indication message, and the traffic indication message further comprises a second SLPID, but not an SLPID bit-map when the SLPID based format is indicated by the FMT field;

determining whether the second SLPID included in the traffic indication message is same as the first SLPID included in the sleep response message when the SLPID based format is used; and

terminating the sleep mode to receive the downlink traffic when the second SLPID in the traffic indication message is same as the first SLPID included in the sleep response message, or

re-entering a sleep window of the sleep mode when the second SLPID included in the traffic indication message is different from the first SLPID included in the sleep response message.

2. The method of claim 1, wherein the first SLPID and second SLPID have unique values within coverage of the BS and the first SLPID is assigned by the BS when the MSS enters the sleep mode.

3. The method of claim 1, wherein the traffic indication message includes a number of positive SLPIDs.

4. The method of claim 1, wherein a length of each of the first SLPID and the second SLPID is 10 bits.

5. A mobile subscriber station (MSS) for receiving an indication of downlink traffic in a sleep mode, the MSS comprising:

a transmission module; and

a reception module,

wherein the MSS is configured to;

transmit a sleep request (MOB-SLP-REQ) message to a base station (BS);

enter the sleep mode in response to a sleep response (MOB-SLP-RSP) message received from the BS, wherein the sleep response message includes a first sleep identifier (SLPID);

receive a traffic indication (MOB-TRF-IND) message comprising a format (FMT) field indicating formats for the traffic indication message from the BS during a listening interval of the sleep mode, wherein the FMT field indicates that an SLPID bitmap based format or an SLPID based format is used for configuring the traffic indication message, and the traffic indication message further comprises a second SLPID, but not an SLPID bit-map when the SLPID based format is indicated by the FMT field;

determine whether the second SLPID included in the traffic indication message is same as the first SLPID included in the sleep response message when the SLPID based format is used; and

terminate the sleep mode to receive the downlink traffic when the second SLPID in the traffic indication message is same as the first SLPID included in the sleep response message, or

re-enter a sleep window of the sleep mode when the second SLPID included in the traffic indication message is different from the first SLPID included in the sleep response message.

6. The mobile subscriber station of claim 5, wherein the first SLPID and second SLPID have unique values within coverage of the BS and the first SLPID is assigned by the BS when the MSS enters the sleep mode.

7. The mobile subscriber station of claim 5, wherein the traffic indication message includes a number of positive SLPIDs.

8. The mobile subscriber station of claim 5, wherein a length of each of the first SLPID and the second SLPID is 10 bits.