EFFICIENT INITIAL ACCESS SYSTEM UNDER A MULTI-CARRIER COMBINATION CONDITION FOR SUPPORTING BROADBAND

• US 20110286411A1
• Filed: 10/22/2009
• Published: 11/24/2011
• Est. Priority Date: 10/22/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Han, Seung Hee, Lee, Moon Il, Kwon, Yeong Hyeon, Chung, Jae Hoon, Kim, So Yeon
• Granted Patent: US 9,203,595 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 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04L 5/0096 Indication of changes in allocation
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02

Abstract

The present invention relates to a wireless access system, and more particularly, to an initial system under a multi-carrier combination condition. A method of for performing an initial access in a base station which supports the multi-band of a terminal according to one embodiment of the present invention comprises the steps of: searching one or more downlink component carriers of the base station; receiving system information including a broadcast channel of a first downlink component carrier from among the searched one or more downlink component carriers and information for indicating one or more uplink component carriers connected to the first downlink component carrier; transmitting a first message to the base station through a first uplink component carrier from among one or more uplink component carriers indicated by the received system information; and receiving a second message including uplink authorization information from the base station through the first downlink component carrier.

Claims

1. A method of performing initial access carried out by a user equipment (UE) to a base station supporting multiple bands, the method comprising:

searching for one or more downlink component carriers of the base station;

receiving a broadcast channel of a first downlink component of the searched one or more downlink component carriers and system information including information indicating one or more uplink component carriers linked with the first downlink component carrier;

transmitting a first message to the base station through a first uplink component carrier of the one or more uplink component carriers indicated by the received system information; and

receiving a second message including uplink grant information from the base station through the first downlink component carrier.

2. The method according to claim 1, further comprising receiving cell-specific carrier setting information including information regarding multiple carriers supported by the base station.

3. The method according to claim 2, wherein the first message includes one random access preamble selected from a random access preamble set indicated by a physical random access parameter included in the broadcast channel.

4. The method according to claim 3, wherein the physical random access parameter is equally set with respect to the one or more downlink component carriers.

5. The method according to claim 4, wherein the second message is transmitted at different timings according to the one or more downlink component carriers linked with the first uplink component carrier.

6. The method according to claim 3, wherein the physical random access parameter is differently set with respect to the one or more downlink component carriers.

7. The method according to claim 3, further comprising receiving carrier assignment information indicating UE-specific or UE-group-specific available candidate carriers in the multiple bands supported by the base station from the base station through dedicated signaling.

8. The method according to claim 4, further comprising receiving carrier change information for overriding the carrier assignment information through UE-specific or UE-group-specific dedicated signaling.

9. A method of supporting initial access of a user equipment (UE) carried out by a base station supporting multiple bands, the method comprising:

receiving a first message from the UE through a first uplink component carrier;

transmitting a second message to the UE through one or more downlink component carriers linked with the first uplink component carrier in response to the first message; and

transmitting carrier assignment information indicating UE-specific or UE-group-specific available candidate carriers in the multiple bands supported by the base station to the UE through dedicated signaling.

10. The method according to claim 9, further comprising transmitting cell-specific carrier setting information including information regarding multiple carriers supported by the base station to the UE.

11. The method according to claim 10, wherein the first message includes one random access preamble selected from a random access preamble set indicated by a physical random access parameter included in a broadcast channel of the base station.

12. The method according to claim 11, wherein the physical random access parameter is equally set with respect to the one or more downlink component carriers.

13. The method according to claim 12, wherein the second message includes different temporary UE identifiers and uplink grant information according to the one or more downlink component carriers.

14. The method according to claim 12, wherein the second message is transmitted to the UE at different timings according to the one or more downlink component carriers.

15. The method according to claim 11, wherein the physical random access parameter is set to have different random access preamble sets according to the one or more downlink component carriers.

16. The method according to claim 15, wherein the second message is transmitted to the UE only through a downlink component carrier having a physical random access parameter corresponding to the random access preamble included in the first message among the one or more downlink component carriers.

17. The method according to claim 11, further comprising transmitting carrier change information for overriding the carrier assignment information to the UE through UE-specific or UE-group-specific dedicated signaling.

18. A user equipment (UE) comprising:

a processor; and

a radio frequency (RF) module configured to receive a RF signal from an external device, perform decoding and demodulation, transmit the decoded and demodulated signal to the processor, or perform modulation and coding with respect to data received from the processor and transmit the modulated and coded data to an external device,

wherein the processor searches for one or more downlink component carriers of a base station, receives a broadcast channel of a first downlink component of the one or more downlink component carriers and system information including information indicating one or more uplink component carriers linked with the first downlink component carrier, transmits a first message to the base station through a first uplink component carrier of the one or more uplink component carriers indicated by the received system information, and receives a second message including uplink grant information from the base station through the first downlink component carrier.