Method for setting sleep interval in a broadband wireless access communication system

• US 20040235536A1
• Filed: 04/28/2004
• Published: 11/25/2004
• Est. Priority Date: 04/29/2003
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Koo, Chang-Hoi, Son, Yeong-Moon, Kim, So-Hyun, Son, Jung-Je
• Application Number:
  US10/833,740
• Publication Number:
  US 20040235536A1
• Time in Patent Office: Days
• US Class Current: 455/574
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A broadband wireless access communication system having a sleep mode in which there is no data to be transmitted or received to/from a base station by a subscriber station, and an awake mode in which there is data to be transmitted or received to/from the base station by the subscriber station. The subscriber station sets a next sleep mode after a sleep interval between a start time of the sleep mode and a start time of the awake mode has reached a given maximum window value. The subscriber station receives a traffic indication message indicating absence of data to be transmitted from the base station after the start time of the awake mode; transmits a sleep request message to the base station; receives a response message to the sleep request message from the base station; and then operates in the next sleep mode.

Claims

1. In a broadband wireless access communication system having a sleep mode in which there is no data to be transmitted or received to/from a base station by a subscriber station, and an awake mode in which there is data to be transmitted or received to/from the base station by the subscriber station, a method for setting a next sleep mode by the subscriber station after a sleep interval between a start time of the sleep mode and a start time of the awake mode has reached a given maximum window value, the method comprising the steps of:

receiving a traffic indication message indicating absence of data to be transmitted from the base station after the start time of the awake mode;

transmitting a sleep request message to the base station;

receiving a response message to the sleep request message from the base station; and

operating in the next sleep mode.

2. The method of claim 1. wherein the response message to the sleep request message includes new minimum window and maximum window values determined by the base station.

3. The method of claim 2, further comprising the step of setting a sleep interval of the next sleep mode to the new minimum window value upon receiving the new minimum window value.

4. The method of claim 3, wherein the sleep interval is set by performing a doubling operation on a previous sleep interval beginning at the new minimum window value when there is no data to be transmitted to the subscriber station after the sleep interval was set to the new minimum window value.

5. The method of claim 1, wherein the traffic indication message is transmitted along with a connection identifier (CID) of the subscriber station when there is data to be transmitted to the subscriber station.

6. The method of claim 1, wherein the sleep interval is set by frames of the data.

7. The method of claim 2, wherein the maximum window value and the minimum window value are previously assigned to the subscriber station by the base station.

8. The method of claim 1, further comprising the steps of:

receiving a message indicating absence of data to be received from the base station in a listening interval after a lapse of a time of the maximum window value;

transitioning to the sleep mode, maintaining the sleep interval for the sleep mode at the maximum window value, and calculating a retry number of the maximum window value;

repeatedly applying the maximum window value to the sleep interval a predetermined number of times, and sending a request for assignment of a new window value to the base station; and

receiving a new window value from the base station.

9. The method of claim 8, wherein the retry number of the maximum window value is transmitted from the subscriber station to the base station.

10. The method of claim 9, wherein the retry number of the maximum window value is a parameter included in the sleep request message.

11. In a broadband wireless access communication system having a sleep mode in which there is no data to be transmitted or received to/from a base station by a subscriber station, and an awake mode in which there is data to be transmitted or received to/from the base station by the subscriber station, a method for setting a next sleep mode by the subscriber station after a sleep interval between a start time of the sleep mode and a start time of the awake mode has reached a given maximum window value, the method comprising the steps of:

receiving a traffic indication message indicating absence of data to be transmitted from the base station after the start time of the awake mode; and

setting a sleep interval for the next sleep mode to a maximum window value, and then operating in the next sleep mode.

12. The method of claim 11, wherein the sleep interval is maintained at the maximum window value when there is no data to be transmitted to the subscriber station after the sleep interval was set to the maximum window value.

13. The method of claim 12, wherein presence/absence of data to be transmitted to the subscriber station is determined through the traffic indication message transmitted from the base station.

14. The method of claim 13, wherein the traffic indication message is transmitted along with a connection identifier (CID) of the subscriber station when there is data to be transmitted to the subscriber station.

15. The method of claim 11, wherein the sleep interval is set by frames of the data.

16. In a broadband wireless access communication system having a sleep mode in which there is no data to be transmitted or received to/from a base station by a subscriber station, and an awake mode in which there is data to be transmitted or received to/from the base station by the subscriber station, a method for setting a next sleep mode by the subscriber station after a sleep interval between a start time of the sleep mode and a start time of the awake mode has reached a given maximum window value, the method comprising the steps of:

receiving a traffic indication message indicating absence of data to be transmitted from the base station after the start time of the awake mode; and

setting a sleep interval for the next sleep mode to a given minimum window value, and then operating in the next sleep mode.

17. The method of claim 16, wherein the sleep interval is set by performing a doubling operation on a previous sleep interval beginning at the minimum window value when there is no data to be transmitted to the subscriber station after the sleep interval was set to the minimum window value.

18. The method of claim 17, wherein presence/absence of data to be transmitted to the subscriber station is determined through the traffic indication message transmitted from the base station.

19. The method of claim 18, wherein the traffic indication message is transmitted along with a connection identifier (CID) of the subscriber station when there is data to be transmitted to the subscriber station.

20. The method of claim 16, wherein the sleep interval is set by frames of the data.

21. The method of claim 16, further comprising the step of setting a next sleep interval to the minimum window value when the sleep interval is increased from the minimum window value on a doubling basis to reach again the maximum window value.