METHOD FOR RESOLVING COLLISION OF UPLINK SIGNALS

• US 20100085956A1
• Filed: 12/07/2009
• Published: 04/08/2010
• Est. Priority Date: 03/03/2008
• Status: Active Grant

• Current Assignee: Joon Kui Ahn, Ki Jun Kim, Young Woo Yun
• Original Assignee: Joon Kui Ahn, Ki Jun Kim, Young Woo Yun
• Inventors: KIM, Ki Jun, AHN, Joon Kui, YUN, Young Woo
• Granted Patent: US 7,876,739 B2
• Time in Patent Office: Days
• US Class Current: 370/344
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

A method for processing data in a wireless communication system is provided. The method includes receiving a first uplink scheduling command indicating a first radio resource, receiving a second uplink scheduling command indicating a second radio resource through a random access response, and stopping a procedure associated with the second uplink scheduling command when the first radio resource and the second radio resource collide.

Claims

1. A method for transmitting uplink signal by a user equipment in a wireless communication system, the method comprising:

receiving a first uplink scheduling command indicating a first radio resource from a base station;

receiving a second uplink scheduling command indicating a second radio resource through a random access response from a base station; and

transmitting an uplink signal according to only the first uplink scheduling command to the base station when the first radio resource and the second radio resource are overlapped.

2. The method according to claim 1, wherein the overlapping of the first radio resource and the second radio resource includes overlapping of at least a part of a time resource and a frequency resource indicated by the first radio resource and the second radio resource.

3. The method according to claim 1, wherein the overlapping of the first radio resource and the second radio resource includes a state in which the first radio resource and the second radio resource indicate the same Transmission Time Interval (TTI) or subframe.

4. A method for performing random access procedure by a user equipment in a wireless communication system, the method comprising:

transmitting a preamble for random access to a base station;

receiving a random access response message from the base station in response to the preamble; and

performing an operation according to only the random access response message if downlink information is received at the time when or after the random access response message is received.

5. The method according to claim 4, wherein the wireless communication system supports Single Carrier-Frequency Division Multiple Access (SC-FDMA) for uplink transmission.

6. The method according to claim 4, wherein the downlink information is not decoded or ignored if the downlink information is received at the time when or after the random access response message is received.

7. The method according to claim 4, wherein the random access response message and the downlink information are received through the same Transmission Time Interval (TTI) or subframe.

8. The method according to claim 4, wherein the random access response message and the downlink information are received through a Physical Downlink Shared CHannel (PDSCH).

9. The method according to claim 8, wherein the random access response message and the downlink information are indicated respectively by a Physical Downlink Control CHannel (PDCCH) masked with a Random Access-Radio Network Temporary Identity (RA-RNTI) and a PDCCH masked with a Cell-RNTI (C-RNTI).

10. The method according to claim 9, wherein the PDCCH masked with the C-RNTI is not decoded or ignored.

11. The method according to claim 10, wherein the PDCCH masked with the C-RNTI is ignored if the RA-RNTI and the C-RNTI are allocated in the same TTI or subframe.

12. The method according to claim 11, wherein the PDSCH indicated by the PDCCH masked with the C-RNTI is not decoded.

13. An user equipment in a wireless communication system, the user equipment comprising:

a radio frequency (RF) module configured to transmit/receive a radio signal to/from a base station;

a symbol generation module connected to the RF module and configured to generate Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbol to be transmitted to the base station; and

a processor configured to control the RF module and the symbol generation module and to perform operations according to radio interface protocol,

wherein the processor configured to perform a random access procedure, the random access procedure comprising the steps of;

transmitting a preamble for random access to the base station;

receiving a random access response message from the base station in response to the preamble; and

performing an operation according to only the random access response message if downlink information is received at the time when or after the random access response message is received.

14. The user equipment according to claim 13, wherein the processor is configured not to decode the downlink information or configured to ignore the downlink information if the downlink information is received at the time when or after the random access response message is received.

15. The user equipment according to claim 13, wherein the random access response message and the downlink information are received through the same Transmission Time Interval (TTI) or subframe.

16. The user equipment according to claim 13, wherein the random access response message and the downlink information are received through a Physical Downlink Shared CHannel (PDSCH).

17. The user equipment according to claim 16, wherein the random access response message and the downlink information are indicated respectively by a Physical Downlink Control CHannel (PDCCH) masked with a Random Access-Radio Network Temporary Identity (RA-RNTI) and a PDCCH masked with a Cell-RNTI (C-RNTI).

18. The user equipment according to claim 17, wherein the processor is configured not to decode the PDCCH masked with the C-RNTI or configured to ignore the PDCCH masked with the C-RNTI.

19. The user equipment according to claim 18, wherein the processor is configured to ignore the PDCCH masked with the C-RNTI if the RA-RNTI and the C-RNTI are allocated in the same TTI or subframe.

20. The user equipment according to claim 19, wherein the processor is configured not to decode PDSCH indicated by the PDCCH masked with the C-RNTI.