METHOD FOR CONTROLLING UPLINK LOAD IN CELL_FACH STATE

• US 20090196230A1
• Filed: 01/30/2009
• Published: 08/06/2009
• Est. Priority Date: 02/01/2008
• Status: Active Grant

• Current Assignee: Birch Stewart Kolasch and Birch LLP, LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Sung Jun, Lee, Young Dae, Yi, Seung June, Kim, Sun Hee, Chun, Sung Duck
• Granted Patent: US 8,446,859 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 76/18 Management of setup rejection or failure

Abstract

A method for a user equipment (UE) to perform uplink re-access in a wireless communication system is provided. The method includes performing an uplink access procedure to establish a data transmission channel, checking whether or not the data transmission channel has been released, and delaying uplink re-access to the data transmission channel by a wait time when the data transmission channel has been released.

Claims

1. A method for a user equipment (UE) to perform uplink re-access in a wireless communication system, the method comprising:

performing an uplink access procedure to establish a data transmission channel;

checking whether or not the data transmission channel has been released; and

delaying uplink re-access to the data transmission channel by a wait time when the data transmission channel has been released.

2. The method according to claim 1, wherein the UE is in a CELL_Forward Access CHannel (CELL_FACH) state.

3. The method according to claim 1, wherein the uplink access procedure includes a random access procedure.

4. The method according to claim 3, further comprising transmitting a random access preamble for uplink re-access to the data transmission channel in uplink after the wait time elapses.

5. The method according to claim 1, wherein the data transmission channel is a dedicated channel.

6. The method according to claim 1, wherein the data transmission channel is a common Enhanced-Dedicated CHannel (E-DCH).

7. The method according to claim 1, wherein information associated with the wait time is received using at least one of a Radio Resource Control (RRC) message, a High Speed-Downlink Shared CHannel (HS-DSCH), and an E-AGCH.

8. The method according to claim 7, wherein the wait time is indicated by a specific AG value transmitted through an E-AGCH, and

the method further comprises receiving mapping information representing a relation between the wait time and the specific AG value.

9. The method according to claim 8, wherein the specific AG value additionally indicates information associated with release of the data transmission channel.

10. The method according to claim 8, wherein the mapping information is received through system information or an RRC message.

11. The method according to claim 1, wherein the wait time is UE-specific or cell-specific.

12. A method for controlling uplink re-access in a wireless communication system, the method comprising:

establishing a data transmission channel for a user equipment (UE) according to an uplink access procedure;

transmitting, to the UE, information associated with a wait time for delaying uplink re-access of the UE to the data transmission channel to the UE when the data transmission channel is released; and

releasing the data transmission channel.

13. The method according to claim 12, wherein the UE is in a CELL_Forward Access CHannel (CELL_FACH) state and the uplink access procedure includes a random access procedure.

14. The method according to claim 12, wherein the data transmission channel is a common Enhanced-Dedicated CHannel (E-DCH).

15. The method according to claim 12, wherein the information associated with the wait time is transmitted using at least one of a Radio Resource Control (RRC) message, a High Speed-Downlink Shared CHannel (HS-DSCH), and an E-AGCH.