Method for controlling operational states of a MAC layer in an OFDM mobile communication system

• US 7,319,680 B2
• Filed: 05/06/2004
• Issued: 01/15/2008
• Est. Priority Date: 06/13/2003
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Cho, Sung-Hyun
• Primary Examiner(s): Gelin; Jean
• Assistant Examiner(s): DOAN, PHUOC HUU
• Application Number:
  US10/840,585
• Publication Number:
  US 20040252662A1
• Time in Patent Office: 1,349 Days
• Field of Search: 370/462, 370/448, 370/229, 370401-402, 455/574
• US Class Current: 370/329
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states

Abstract

A mobile communication system includes a medium access control (MAC) layer that supports an idle state in which no downlink and uplink dedicated control channel and dedicated traffic channel exists and also supports an active state in which the downlink and uplink dedicated control channel and dedicated traffic channel exist. The MAC layer controls transitioning to a contention state and then transitioning from the contention state to the active state through contention-based access, if there is transmission data in the idle state; transitioning to a fast access state or a slow access state according to priority of the data if there is no transmission data in the active state for a preset time; transitioning to the active state through contention-free-based access if there is transmission data in the fast access state; and transitioning to the active state through contention-free-based access if there is transmission data in the slow access state.

Claims

1. A method for controlling operational states of a medium access control (MAC) layer in a mobile communication system including the MAC layer, the MAC layer supporting an idle state in which no downlink and uplink dedicated control channel and dedicated traffic channel exists and also supporting an active state in which the downlink and the uplink dedicated control channel and the dedicated traffic channel exist, the method comprising the steps of:

(a) transitioning to a contention state and then transitioning from the contention state to the active state through contention-based access if there is transmission data in the idle state;

(b) transitioning to one of a fast access state and a slow access state according to priority of the data if there is no transmission data in the active state for a preset time;

(c) transitioning to the active state through contention-free-based access if there is transmission data in the fast access state; and

(d) transitioning to the active state through contention-free-based access if there is transmission data in the slow access state.

2. The method of claim 1, wherein the contention-free-based access in the fast access state is performed by requesting an assignment of an uplink dedicated traffic channel using a fast feedback channel (FFCH).

3. The method of claim 2, wherein a transmission period of the fast feedback channel is set to one of a predetermined period and a period corresponding to the priority.

4. The method of claim 2, wherein the fast feedback channel includes uplink dedicated traffic channel assignment request information, channel quality information of the assignment-requested uplink dedicated traffic channel, and feedback information.

5. The method of claim 1, wherein the contention-free-based access in the slow access state is performed by requesting an assignment of an uplink traffic channel using a slow feedback channel (SFCH).

6. The method of claim 5, wherein a transmission period of the slow feedback channel is set to one of a predetermined period and a period corresponding to the priority.

7. The method of claim 5, wherein the slow feedback channel includes uplink dedicated traffic channel assignment request information.

8. The method of claim 5, wherein the slow feedback channel further includes channel quality information of the assignment requested uplink dedicated traffic channel and feedback information.

9. The method of claim 1, wherein the step (c) comprises the steps of:

transmitting a fast feedback channel and uplink dedicated traffic channel assignment request information if there is transmission data in the fast access state; and

monitoring a shared control channel after requesting assignment of the uplink dedicated traffic channel, and transitioning to the active state, if the uplink dedicated traffic channel is assigned.

10. The method of claim 9, further comprising the step of transmitting the fast feedback channel and feedback information if there is no transmission data in the fast access state.

11. The method of claim 1, wherein the step (d) comprises the steps of:

transmitting a slow feedback channel and uplink dedicated traffic channel assignment request information if there is transmission data in the slow access state; and

monitoring a shared control channel after requesting assignment of the uplink dedicated traffic channel, and transitioning to the active state, if the uplink dedicated traffic channel is assigned.

12. The method of claim 11, wherein the uplink dedicated traffic channel assignment request information is an uplink dedicated traffic channel assignment request bit, and the uplink dedicated traffic channel assignment request bit is set to a first value.

13. The method of claim 12, further comprising the step of transmitting the slow feedback channel by setting the uplink dedicated traffic channel assignment request bit to a second value if there is no transmission data in the slow access state.

14. The method of claim 1, wherein the priority is determined according to one of service quality of the data and a traffic class.

15. A method for controlling operational states of a medium access control (MAC) layer in a mobile communication system including the MAC layer, the MAC layer supporting an idle state in which no downlink and uplink dedicated control channel and dedicated traffic channel exists and also supporting an active state in which the downlink and the uplink dedicated control channel and the dedicated traffic channel exist, the method comprising the steps of:

(a) transitioning to a contention state and then transitioning from the contention state to the active state through contention-based access, if there is transmission data in the idle state;

(b) transitioning to one of a fast access state and a slow access state according to priority of the data if there is no transmission data in the active state for a preset time;

(c) transitioning to the active state through the contention-free-based access if there is transmission data in the fast access state;

(d) transitioning to the slow access state if there is no transmission data in the fast access state for a preset time; and

(e) transitioning to the active state through the contention-free-based access if there is transmission data in the slow access state.

16. The method of claim 15, wherein the contention-free-based access in the fast access state is performed by requesting an assigmnent of an uplink dedicated traffic channel using a fast feedback channel (FFCH).

17. The method of claim 16, wherein a transmission period of the fast feedback channel is set to one of a predetermined period and a period corresponding to the priority.

18. The method of claim 16, wherein the fast feedback channel includes uplink dedicated traffic channel assignment request information, channel quality information of the assignment-requested uplink dedicated traffic channel, and feedback information.

19. The method of claim 15, wherein the contention-free-based access in the slow access state is performed by requesting an assignment of an uplink traffic channel using a slow feedback channel (SFCH).

20. The method of claim 19, wherein a transmission period of the slow feedback channel is set to one of a predetermined period and a period corresponding to the priority.

21. The method of claim 19, wherein the slow feedback channel includes uplink dedicated traffic channel assignment request information.

22. The method of claim 19, wherein the slow feedback channel further includes channel quality information of the assignment-requested uplink dedicated traffic channel.

23. The method of claim 15, wherein the step (c) comprises the steps of:

transmitting a fast feedback channel and uplink dedicated traffic channel assignment request information if there is transmission data in the fast access state; and

monitoring a shared control channel after requesting assignment of the uplink dedicated traffic channel, and transitioning to the active state, if the uplink dedicated traffic channel is assigned.

24. The method of claim 23, further comprising the step of transmitting the fast feedback channel and feedback information, if there is no transmission data in the fast access state.

25. The method of claim 15, wherein the step (e) comprises the steps of:

transmitting a slow feedback channel and uplink dedicated traffic channel assignment request information, if there is transmission data in the slow access state; and

monitoring a shared control channel after requesting assignment of the uplink dedicated traffic channel, and transitioning to the active state if the uplink traffic channel is assigned.

26. The method of claim 25, wherein the uplink dedicated traffic channel assignment request information is an uplink dedicated traffic channel assignment request bit, and the uplink dedicated traffic channel assignment request bit is set to a first value.

27. The method of claim 26, further comprising the step of transmitting the slow feedback channel by setting the uplink dedicated traffic channel assignment request bit to a second value if there is no transmission data in the slow access state.

28. The method of claim 15, wherein the priority is determined according to one of service quality of the data and a traffic class.