METHOD AND APPARATUS FOR TRANSMITTING A SOUNDING REFERENCE SIGNAL

• US 20130208710A1
• Filed: 10/28/2011
• Published: 08/15/2013
• Est. Priority Date: 10/28/2010
• Status: Abandoned Application

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Dong Youn, Kim, Min Gyu, Yang, Suck Chel, Ahn, Joon Kui
• Application Number:
  US13/880,939
• Publication Number:
  US 20130208710A1
• Time in Patent Office: Days
• US Class Current: 370/336
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 27/2646 using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/30 using constraints in the total amount of available transmission power
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0473 the resource being transmission power
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 8/22 Processing or transfer of terminal data, e.g. status or physical capabilities

Abstract

Provided are a method and apparatus for transmitting a sounding reference signal. A terminal receives, from a base station, a configuration for periodic channel quality indicator (CQI) transmission and a configuration for sound reference signal (SRS) transmission. When a positive SRS request is detected, the terminal determines an SRS subframe winch satisfies the configuration for SRS transmission. When the periodically transmitted CQI is triggered in the SRS subframe, the terminal transmits the SRS in the SRS subframe to the base station.

Claims

1. A method of transmitting a sounding reference signal in a wireless communication system, the method comprising:

receiving, by a user equipment, a configuration for periodic channel quality indicator (CQI) transmission from a base station;

receiving, by the user equipment, a configuration for sounding reference signal (SRS) transmission from the base station;

monitoring, by the user equipment, a physical downlink control channel (PDCCH) in order to detect a positive SRS request;

upon detecting the positive SRS request, determining a SRS subframe which satisfies the configuration for SRS transmission; and

if a periodic CQI is also triggered in the SRS subframe, transmitting a SRS in the SRS subframe to the base station.

2. The method of claim 1, wherein the periodic CQI is not transmitted in the SRS subframe.

3. The method of claim 2, wherein the configuration for SRS transmission includes a SRS periodicity and a SRS subframe offset, and the configuration for periodic CQI transmission includes a CQI periodicity and a CQI subframe offset.

4. The method of claim 3, wherein the SRS subframe is determined as a first subframe which satisfies the configuration for SRS transmission and n+k, where k≧

4, when the positive SRS request is detected in a subframe n.

5. The method of clam 2, wherein the periodic CQI is not multiplexed with a hybrid automatic repeat request (HARQ) ACK/NACK.

6. The method of claim 5, wherein the periodic CQI is transmitted on a physical uplink control channel (PUCCH).

7. The method of claim 5, further comprising:

if a periodic CQI multiplexed with the HARQ ACK/NACK is triggered in the SRS subframe, transmitting the multiplexed CQI in the SRS subframe to the base station.

8. The method of claim 7, wherein the multiplexed CQI is transmitted on a PUCCH.

9. A user equipment configured for transmitting a sounding reference signal in a wireless communication system, the user equipment comprising:

a radio frequency unit configured to transmit a radio signal; and

a processor operatively coupled with the radio frequency unit and configured to;

receive a configuration for periodic channel quality indicator (CQI) transmission from a base station;

receive a configuration for sounding reference signal (SRS) transmission from the base station;

monitor a physical downlink control channel (PDCCH) in order to detect a positive SRS request;

upon detecting the positive SRS request, determine a SRS subframe which satisfies the configuration for SRS transmission; and

if a periodic CQI is also triggered in the SRS subframe, transmit a SRS in the SRS subframe to the base station.

10. The user equipment of claim 9, wherein the periodic CQI is not transmitted in the SRS subframe.

11. The user equipment of claim 10, wherein the configuration for SRS transmission includes a SRS periodicity and a SRS subframe offset, and the configuration for periodic CQI transmission includes a CQI periodicity and a CQI subframe offset.

12. The user equipment of claim 11, wherein the SRS subframe is determined as a first subframe which satisfies the configuration for SRS transmission and n+k, where k≧

4, when the positive SRS request is detected in a subframe n.

13. The user equipment of clam 10, wherein the periodic CQI is not multiplexed with a hybrid automatic repeat request (HARQ) ACK/NACK.

14. The user equipment of claim 13, wherein the processor is configured to transmit a multiplexed CQI which is multiplexed with the HARQ ACK/NACK in the SRS subframe to the base station if the multiplexed CQI is triggered in the SRS subframe.

15. The user equipment of claim 14, wherein the multiplexed CQI is transmitted on a physical uplink control channel.