METHOD FOR TRANSMITTING CONTROL INFORMATION IN A CARRIER AGGREGATION SYSTEM, RECEIVING METHOD, AND TERMINAL

• US 20120243499A1
• Filed: 12/08/2010
• Published: 09/27/2012
• Est. Priority Date: 12/09/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Moon, Sung Ho, Noh, Min Seok, Chung, Jae Hoon, Han, Seung Hee, Kim, So Yeon
• Granted Patent: US 8,995,368 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method of transmitting control information in a carrier aggregation system is provided. The method includes: transmitting bandwidth information of a component carrier; configuring downlink control information including an additional indication field and an information field; mapping the downlink control information in any one of containing units having a plurality of predetermined different bit sizes in accordance with the bandwidth information; and transmitting the downlink control information mapped to any one of the containing units, wherein the information field is any one of a plurality of control information formats applicable to the component carrier, and the additional indication field includes information indicating a specific control information format to which the information field corresponds among the plurality of control information formats. Accordingly, the number of blind decoding attempts of a user equipment can decrease in a carrier aggregation system. Therefore, power consumption of the user equipment can decrease, and a decoding rate can increase.

Claims

1. A method of transmitting control information in a carrier aggregation system, the method comprising:

transmitting bandwidth information of a component carrier;

configuring downlink control information including an additional indication field and an information field;

mapping the downlink control information in any one of containing units having a plurality of predetermined different bit sizes in accordance with the bandwidth information; and

transmitting the downlink control information mapped to any one of the containing units,

wherein the information field is any one of a plurality of control information formats applicable to the component carrier, and the additional indication field includes information indicating a specific control information format to which the information field corresponds among the plurality of control information formats.

2. The method of claim 1, wherein the additional indication field includes at least one of a transmission mode indication field indicating a transmission mode for the component carrier and an antenna port indication field indicating an antenna port for the component carrier, and includes a carrier indication field indicating the component carrier.

3. The method of claim 2, wherein the additional indication field further includes an uplink/downlink indication field indicating for which link between an uplink and a downlink the information field is used as control information.

4. The method of claim 2, wherein the additional indication field further includes a format indication field capable of identifying the containing units having the plurality of predetermined different bit sizes.

5. The method of claim 1, wherein the additional indication field is mapped to a predetermined fixed location in the any one of the containing units.

6. The method of claim 1, wherein the additional indication field is mapped for all of the containing units, each having a predetermined different bit size, with the same position and the same bit size.

7. The method of claim 1, wherein if a bit size of the any one of containing units is greater than the total bit size of the additional indication field and the information field, different bits remaining after mapping the additional indication field and the information field in the any one of containing units are padded to a bit having a specific value.

8. The method of claim 1,

wherein if the component carrier is plural in number, a common search space is configured only in some of the plurality of component carriers, and downlink control information for a plurality of user equipments is transmitted in the common search space, and

wherein the some of component carriers are component carriers commonly assigned to the plurality of user equipments.

9. A method of receiving control information of a user equipment in a carrier aggregation system, the method comprising:

receiving bandwidth information of a component carrier; and

receiving downlink control information by monitoring containing units having a plurality of predetermined different bit sizes in accordance with the bandwidth information,

wherein the downlink control information is mapped to any one of the containing units having the plurality of predetermined different bit sizes, and

wherein the downlink control information includes an additional indication field and an information field, the information field is any one of a plurality of control information formats applicable to the component carrier, and the additional indication field includes information indicating a specific control information format to which the information field corresponds among the plurality of control information formats.

10. The method of claim 9, wherein the additional indication field includes at least one of a transmission mode indication field indicating a transmission mode for the component carrier and an antenna port indication field indicating an antenna port for the component carrier, and includes a carrier indication field indicating the component carrier.

11. The method of claim 10, wherein the additional indication field further includes an uplink/downlink indication field indicating for which link between an uplink and a downlink the information field is used as control information.

12. The method of claim 10, wherein the additional indication field further includes a format indication field capable of identifying the containing units having the plurality of predetermined different bit sizes.

13. The method of claim 9, wherein the additional indication field is mapped to a predetermined fixed location in the any one of the containing units.

14. The method of claim 9, wherein the additional indication field is mapped for all of the containing units, each having a predetermined different bit size, with the same position and the same bit size.

15. The method of claim 9, wherein if a bit size of the any one of containing units is greater than the total bit size of the additional indication field and the information field, different bits remaining after mapping the additional indication field and the information field in the any one of containing units are padded to a bit having a specific value.

16. A user equipment in a carrier aggregation system, comprising:

a radio frequency (RF) unit transmitting and receiving a radio signal; and

a processor coupled to the RF unit, wherein the processor is configured for receiving bandwidth information of a component carrier and receives downlink control information by monitoring containing units having a plurality of predetermined different bit sizes in accordance with the bandwidth information,

wherein the downlink control information is mapped to any one of the containing units having the plurality of predetermined different bit sizes, and

wherein the downlink control information includes an additional indication field and an information field, the information field is any one of a plurality of control information formats applicable to the component carrier, and the additional indication field includes information indicating a specific control information format to which the information field corresponds among the plurality of control information formats.