Method for controlling uplink load in cell — FACH state

• US 8,446,859 B2
• Filed: 01/30/2009
• Issued: 05/21/2013
• Est. Priority Date: 02/01/2008
• Status: Expired due to Fees

• Current Assignee: Birch Stewart Kolasch and Birch LLP, LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Sun Hee, Lee, Young Dae, Chun, Sung Duck, Park, Sung Jun, Yi, Seung June
• Primary Examiner(s): Moore, Ian N
• Assistant Examiner(s): Le, Brian T
• Application Number:
  US12/363,037
• Publication Number:
  US 20090196230A1
• Time in Patent Office: 1,572 Days
• Field of Search: 370/455, 370/435, 370/436
• 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 of performing an uplink re-access by a User Equipment (UE) 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 is released by a network; and

delaying uplink re-access to the data transmission channel by a wait time when the data transmission channel is released by the network,

wherein the wait time is indicated by at least one specific AG (Absolute Grant) index received through an E-AGCH (Enhanced-Absolute Grant CHannel), and

wherein at least one remaining AG index received through the E-AGCH indicates an AG value associated with a data rate for the data transmission channel,

wherein the method further comprises;

receiving mapping information representing a first relation between the wait time and the at least one specific AG index and a second relation between the AG value and the at least one remaining AG index.

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 the at least one specific AG index additionally indicates information associated with a release of the data transmission channel.

8. The method according to claim 1, wherein the mapping information is received through system information or a Radio Resource Control (RRC) message.

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

13. The method according to claim 1, wherein a number of the at least one specific AG index is determined based on a maximum data rate for the data transmission channel.

10. A method for controlling uplink re-access by a network 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,

wherein the wait time is indicated by at least one specific AG (Absolute Grant) index transmitted through an E-AGCH (Enhanced-Absolute Grant CHannel), and

wherein at least one remaining AG index transmitted through the E-AGCH indicates an AG value associated with a data rate for the data transmission channel,

wherein the method further comprises;

transmitting mapping information representing a first relation between the wait time and the at least one specific AG index and a second relation between the AG value and the at least one remaining AG index.

11. The method according to claim 10, wherein the UE is in a CELL_Forward Access CHannel (CELL_FACH) state and the uplink access procedure includes a random access procedure.

12. The method according to claim 10, wherein the data transmission channel is a common Enhanced-Dedicated CHannel (E-DCH).

14. The method according to claim 10, wherein a number of the at least one specific AG index is determined based on a maximum data rate for the data transmission channel.

15. A User Equipment (UE) configured to perform an uplink re-access in a wireless communication system, comprising:

a processor configured to

perform an uplink access procedure to establish a data transmission channel,

check whether or not the data transmission channel is released by a network, and

delay uplink re-access to the data transmission channel by a wait time when the data transmission channel is released by the network,

wherein the wait time is indicated by at least one specific AG (Absolute Grant) index received through an E-AGCH (Enhanced-Absolute Grant CHannel), and

wherein at least one remaining AG index received through the E-AGCH indicates an AG value associated with a data rate for the data transmission channel,

wherein the processor is further configured to receive mapping information representing a first relation between the wait time and the at least one specific AG index and a second relation between the AG value and the at least one remaining AG index.