METHOD OF TRANSMITTING CHANNEL INFORMATION IN WIRELESS COMMUNICATION SYSTEM

• US 20090040998A1
• Filed: 07/24/2008
• Published: 02/12/2009
• Est. Priority Date: 08/06/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Yong Bae
• Granted Patent: US 8,259,698 B2
• Time in Patent Office: Days
• US Class Current: 370/345
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0028 Formatting
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information

Abstract

A method of transmitting channel information in a wireless communication system includes generating a channel quality indicator (CQI) including a channel variation indicating temporal changes in downlink channel condition, and transmitting the CQI through an uplink physical channel. Since a modulation and coding scheme is determined by considering changes in channel environment, reception performance of a user equipment can be improved and reliable service can be provided.

Claims

1. A method of transmitting channel information in a wireless communication system, the method comprising:

generating a channel quality indicator (CQI) including a channel variation indicating temporal changes of downlink channel condition; and

transmitting the CQI through an uplink physical channel.

2. The method of claim 1, wherein the CQI comprises a recommended modulation format (RMF) and a recommended transport block size (RTBS).

3. The method of claim 1, wherein the channel variation is obtained by using received signal strength indications (RSSIs) of midambles for a plurality of downlink time slots.

4. The method of claim 3, wherein the channel variation is a dispersion of the RSSIs of the midambles for the plurality of downlink time slots.

5. The method of claim 1, wherein the uplink physical channel is a high speed shared information channel (HS-SICH) which is a shared information channel for a high speed downlink shared channel (HS-DSCH).

6. A method of transmitting data in a wireless communication system, the method comprising:

receiving a channel quality indicator (CQI) including a channel variation indicating temporal changes in downlink channel condition;

determining a modulation and coding scheme according to the CQI; and

transmitting downlink data by using the modulation and coding scheme.

7. The method of claim 6, wherein the downlink data is transmitted through a high speed downlink shared channel (HS-DSCH).

8. The method of claim 6, wherein the channel variation is obtained from midambles for a plurality of downlink time slots.