Method for controlling sleep mode in wireless access communication system

• US 7,430,421 B2
• Filed: 08/05/2004
• Issued: 09/30/2008
• Est. Priority Date: 09/01/2003
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Jeong-Hoon
• Primary Examiner(s): Anderson; Matthew
• Assistant Examiner(s): Dao; Minh D
• Application Number:
  US10/911,944
• Publication Number:
  US 20050075148A1
• Time in Patent Office: 1,517 Days
• Field of Search: 455/456.1, 4554341-4344, 455/404.2, 370/311
• US Class Current: 455/456.1
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for controlling a sleep mode in a wireless access communication system is disclosed. In the method, a base station and a subscriber terminal share a predetermined number of SI for a sleep mode control, and the base station sets a paging position by means of a predetermined BCID assigned to subscriber terminals and the SI, so that the base station can easily manage sleep intervals of the subscriber terminals. Further, since information for a sleep interval scheduling is not transmitted when the subscriber terminal shifts to a sleep mode, the amount of traffic between the subscriber terminal and the base station can be reduced.

Claims

1. A method for controlling a sleep mode by a base station in a wireless access communication system including the base station and subscriber terminals, the method comprising the steps of:

a) generating a group identifier by using a connection identifier of a subscriber terminal;

b) assigning the connection identifier to the subscriber terminal;

c) receiving a sleep request (SLP-REQ) message including an index value from the subscriber terminal;

d) determining the index value from among a plurality of index values based on a negotiation between the base station and the subscriber terminal, and transmitting a sleep response (SLP-RSP) message including the determined index value to the subscriber terminal; and

e) determining a listening position by using the group identifier of the subscriber terminal that transmits the SLP-REQ message and the determined index value.

2. The method as claimed in claim 1, wherein the group identifier is used to determine a start time of a sleep mode for grouping the subscriber terminal.

3. The method as claimed in claim 2, wherein the group identifier uses an inherent basic connection identification.

4. The method of claim 3, further including a step of generating and transmitting a traffic-indication message, which contains a basic connection ID of a corresponding subscriber terminal, at a time corresponding to the listening position.

5. The method of claim 2, further including a step of generating and transmitting a traffic-indication message, which contains a basic connection ID of a corresponding subscriber terminal, at a time corresponding to the listening position.

6. The method as claimed in claim 1, wherein the index value is determined by a response of the base station when the subscriber terminal selects and requires an index values.

7. The method of claim 6, further including a step of generating and transmitting a traffic-indication message, which contains a basic connection ID of a corresponding subscriber terminal, at a time corresponding to the listening position.

8. The method as claimed in claim 1, wherein the index value has multiple values of a preset sleep period unit time and determines the listening position.

9. The method of claim 8, further including a step of generating and transmitting a traffic-indication message, which contains a basic connection ID of a corresponding subscriber terminal, at a time corresponding to the listening position.

10. The method as claimed in claim 1, wherein step c) is performed simultaneously and independently by the subscriber terminal and the base station.

11. The method as claimed in claim 10, wherein the listening position is determined by

Sb*(SI+1)=FN mod{F*(SI+1)}

where Sb represents a group identifier, SI represents an index value, F represents a preset sleep unit time, and FN represents a frame number corresponding to a listening position.

12. The method of claim 11, further including a step of generating and transmitting a traffic-indication message, which contains a basic connection ID of a corresponding subscriber terminal, at a time corresponding to the listening position.

13. The method of claim 1, further including a step of generating and transmitting a traffic-indication message, which contains a basic connection ID of a corresponding subscriber terminal, at a time corresponding to the listening position.

14. The method of claim 1, further including a step of generating and transmitting a traffic-indication message, which contains a basic connection ID of a corresponding subscriber terminal, at a time corresponding to the listening position.

15. A method for controlling a sleep mode by a subscriber terminal in a wireless access communication system including a base station and subscriber terminals, the method comprising the steps of:

a) receiving a connection identifier which is generated by a group identifier from the base station;

b) transmitting a sleep request (SLP-REQ) message including an index value which is a sleep period selling information;

c) receiving a sleep response (SLP-RSP) message including one index value from among a plurality of index values from the base station; and

d) determining an awake frame by using the index value included in the SLP-RSP message and the connection identifier.

16. The method as claimed in claim 15, wherein the group identifier is used to determine a start time of a sleep mode for grouping the subscriber terminal.

17. The method as claimed in claim 15, wherein the index value included in the SLP-REQ message is the index value the subscriber terminal selects from among a plurality of index values.

18. The method as claims in claim 15, wherein the index value is used to determine the awake frame by applying multiple values of a preset sleep period unit time.

19. The method as claimed in claim 15, wherein step d) is performed simultaneously and independently by the subscriber terminal and the base station.

20. The method as claimed in claim 15, wherein the awake frame is determined by

Sb*(SI+1)=FN mod{F*(SI+1)}

where Sb represents a group identifier, SI represents an index value. F represents a preset sleep unit time, and FN represents a frame number corresponding to the awake frame.

21. The method as claimed in claim 15, further including receiving a traffic-indication message at a time corresponding to the awake frame.