System and method for controlling operation states of a medium access control layer in a broadband wireless access communication system

• US 20050128990A1
• Filed: 12/10/2004
• Published: 06/16/2005
• Est. Priority Date: 12/12/2003
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Song, Bong-Gee, Cho, Min-Hee, Chang, Hong-Sung, Ju, Hyeong-Jong, Hong, Seung-Eun, Eom, Kwang-Seop
• Granted Patent: US 7,526,288 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• CPC Class Codes: H04W 68/00 User notification, e.g. alerting and paging, for incoming communication, change of service or the like
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

An apparatus and method for controlling operation states of a medium access control layer by a mobile subscriber station (MSS) in a broadband wireless access communication system. The method includes: state-transitioning into a sleep state or an idle state when there is no data transmitted between a base station and the MSS during a predetermined first time interval in an awake state; and performing a location change in the idle state when the mobile subscriber station moves from a first paging zone to a second paging zone, and state-transiting into the awake state when the mobile subscriber station in the idle state detects a paging to the mobile subscriber station. The method minimizes power consumption and maximizes efficiency in use of radio resources.

Claims

1. A method for controlling operation states of a medium access control (MAC) layer by a mobile subscriber station (MSS) in a broadband wireless access communication system, the method comprising the steps of:

state-transiting into an idle state when there is no data transmission between the MSS and a base station (BS) during a predetermined first time interval in an awake state; and

updating a location of the MSS according to location change in the idle state when the MSS moves from a first paging zone, to which the MSS currently belongs, to a second paging zone; and

state-transiting into the awake state when the MSS in the idle state detects a paging signal to the MSS.

2. The method as claimed in claim 1, further comprising a step of;

state-transiting into a sleep state when there is no data transmission between the MSS and the BS during the predetermined first time interval in the awake state; and

state-transiting from the sleep state to the idle state when a predetermined second time interval has passed in the sleep state.

3. The method as claimed in claim 1, wherein each of the first paging zone and the second paging zone includes a plurality of BSs using a same paging zone identifier to provide services.

4. The method as claimed in claim 3, wherein, in the step of updating the location of the MSS, the MSS transmits information including a MSS identifier of the MSS to a paging zone controller, to request the paging zone controller to change a location of the MSS into a location of a new BS to which the MSS currently belongs within the second paging zone, the paging zone controller controlling the first paging zone and the second paging zone.

5. The method as claimed in claim 4, wherein the MSS identifier is a MAC address of the MSS.

6. The method as claimed in claim 1, wherein the MSS detects existence of the paging signal by receiving paging information broadcasted from a BS to which the MSS currently belongs and recognizes the paging when the paging information includes a MSS identifier of the MSS.

7. The method as claimed in claim 6, wherein the MSS identifier is a MAC address of the MSS.

8. A method for controlling operation states of a medium access control (MAC) layer by a mobile subscriber station (MSS) in a broadband wireless access communication system, the method comprising the steps of:

requesting de-registration of the MSS to a base station (BS) by the MSS when there is no data transmission between the BS and the MSS during a predetermined first time interval in an awake state;

canceling registration of the MSS in accordance with the de-registration request;

transmitting a response to the de-registration request to the MSS by the BS; and

state-transiting from the awake state to an idle state by the MSS in accordance with the response from the BS.

9. The method as claimed in claim 8, further comprising the steps of:

transmitting a location change request to a paging zone controller by the MSS when the MSS in the idle state moves from a first paging zone, to which the MSS currently belongs, to a second paging zone;

changing a location of the MSS into a location within the second paging zone in accordance with the location change request;

transmitting a response to the location change request to the MSS by the paging zone controller; and

state-transiting from the idle state to the awake state by the MSS when the MSS detects a paging signal to the MSS.

10. The method as claimed in claim 8, wherein the step of requesting de-registration of the MSS comprises transmitting a de-registration request to the BS, the de-registration request including a sleep interval during which the MSS wants to stay in the idle state.

11. The method as claimed in claim 10, wherein the BS transmits the response to the de-registration request in a sleep interval during which the MSS must stay in the idle state.

12. The method as claimed in claim 9, wherein each of the first paging zone and the second paging zone includes a plurality of BSs using a same paging zone identifier to provide services.

13. The method as claimed in claim 12, wherein, in the step of requesting location change, the MSS transmits information including a MSS identifier of the MSS to a paging zone controller, in order to request the paging zone controller to change a location of the MSS into a location of a new BS to which the MSS currently belongs within the second paging zone, the paging zone controller controlling the first paging zone and the second paging zone.

14. The method as claimed in claim 13, wherein the MSS identifier is a MAC address of the MSS.

15. The method as claimed in claim 12, wherein the response to the location change request includes a MSS identifier of the MSS, a time point at which the MSS must start to sleep in the idle state, and information on the sleep interval.

16. The method as claimed in claim 15, wherein the MSS identifier is a MAC address of the MSS.

17. The method as claimed in claim 9, wherein the MSS detects the existence of the paging signal by receiving paging information broadcasted from the BS to which the MSS currently belongs and recognizes existence of the paging signal when the paging information contains a MSS identifier of the MSS.

18. The method as claimed in claim 17, wherein the MSS identifier is a MAC address of the MSS.

19. A system for controlling operation states of a medium access control (MAC) layer in a broadband wireless access communication system, the system comprising:

a base station (BS);

a mobile subscriber station (MSS) for transmitting de-registration request to the BS when there is no data transmission between the BS and the MSS during a predetermined first time interval in an awake state, state-transiting from the awake state to an idle state when receiving a response to the de-registration request from the BS, transmitting a location change request when the MSS in the idle state moves from a first paging zone, to which the MSS currently belongs, to a second paging zone, receiving a location change response to the location change request, and state-transitioning from the idle state to the awake state when detecting a paging signal to the MSS; and

a paging zone controller for receiving the location change request from the MSS, changing a location of the MSS into a location within the second paging zone in accordance with the location change request, and transmitting the response to the location change request to MSS.

20. The system as claimed in claim 19, wherein the de-registration request transmitted from the MSS to the BS comprises a sleep interval during which the MSS wants to stay in the idle state.

21. The system as claimed in claim 20, wherein the response transmitted from the MSS to the BS in response to the de-registration request comprises a sleep interval during which the MSS must stay in the idle state.

22. The system as claimed in claim 19, wherein each of the first paging zone and the second paging zone comprises a plurality of BS using a same paging zone identifier to provide services.

23. The system as claimed in claim 22, wherein, when MSS transmits the location change request, the MSS transmits information including a MSS identifier of the MSS to the paging zone controller, in order to request the paging zone controller to change the location of the MSS into a location of a new BS to which the MSS currently belongs within the second paging zone, the paging zone controller controlling the first paging zone and the second paging zone.

24. The system as claimed in claim 23, wherein the MSS identifier is a MAC address of the MSS.

25. The system as claimed in claim 22, wherein the response transmitted by the paging zone controller in response to the location change request comprises a MSS identifier of the MSS, a time point at which the MSS must start to sleep in the idle state, and information on the sleep interval.

26. The system as claimed in claim 25, wherein the MSS identifier is a MAC address of the MSS.

27. The system as claimed in claim 19, wherein the MSS receives paging information broadcasted from the BS to which the MSS currently belongs and recognizes the paging signal when paging information includes a MSS identifier of the MSS.

28. The system as claimed in claim 27, wherein the MSS identifier is a MAC address of the MSS.