METHOD AND APPARATUS FOR PERFORMING RANDOM ACCESS IN A MULTI-CARRIER SYSTEM

• US 20110235609A1
• Filed: 12/03/2009
• Published: 09/29/2011
• Est. Priority Date: 12/04/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Sang Woo, Ahn, Seung Jin, Kwon, Sang Won, Yoon, Won Yong
• Granted Patent: US 8,958,317 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• 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: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 74/002 Transmission of channel access control information

Abstract

A method of a user equipment performing random access in a multi-carrier system comprises receiving mapping information through downlink component carriers, sending a random access preamble through uplink component carriers, and receiving a random access response through a specific downlink component carriers determined based on the mapping information.

Claims

1. A method of a user equipment performing random access in a multi-carrier system, the method comprising:

receiving mapping information through downlink component carriers;

sending a random access preamble through uplink component carriers; and

receiving a random access response through a specific downlink component carrier determined based on the mapping information.

2. The method of claim 1, wherein the uplink component carriers comprise a component carrier placed at a highest band or a component carrier placed at a lowest band in a frequency domain, from among a number of the component carriers used by the user equipment for uplink transmission.

3. The method of claim 1, wherein the mapping information comprises information indicative of a specific one of the downlink component carriers through which the random access response is received according to radio resources through which the random access preamble is transmitted.

4. The method of claim 3, wherein the radio resources are determined by an uplink component carrier, a subframe index, or a resource block index.

5. The method of claim 3, wherein the mapping information further comprises a bitmap indicative of a component carrier placed at a highest band or a component carrier placed at a lowest band in a frequency domain, from among a number of the component carriers used by the user equipment for uplink transmission.

6. The method of claim 1, wherein the mapping information comprises information indicative of a specific one of the downlink component carriers through which the random access response is received according to an identifier (ID) of the random access preamble.

7. The method of claim 1, wherein the uplink component carriers are determined based on an index of a subframe or an index of a resource block through which the random access preamble is transmitted.

8. The method of claim 1, wherein the mapping information is received from a broadcast channel transmitted through the downlink component carriers.

9. The method of claim 1, further comprising sending a scheduled message through radio resources assigned based on the random access response.

10. The method of claim 9, wherein the scheduled message is transmitted through an uplink component carrier determined based on uplink component carrier information included in the random access response.

11. The method of claim 9, wherein in a case in which information about an uplink component carrier through which the scheduled message will be sent is not included in the random access response, the scheduled message is transmitted through an uplink component carrier through which the random access preamble is transmitted.

12. A user equipment, comprising:

a Radio Frequency (RF) unit configured to send or receive a radio signal; and

a processor connected to the RF unit,

wherein the processor is configured to receive mapping information through a broadcast channel included in downlink component carriers, send a random access preamble through uplink component carriers, and receive a random access response through a specific downlink component carriers determined based on the mapping information.

13. The user equipment of claim 12, wherein the uplink component carriers comprise at least one of a component carrier placed at a highest band and a component carrier placed at a lowest band in a frequency domain, from among a number of the component carriers used for uplink transmission.

14. The user equipment of claim 12, wherein the mapping information comprises information indicative of a specific one of the downlink component carriers through which the random access response is received according to radio resources through which the random access preamble is transmitted.