METHOD FOR TRANSMITTING AND RECEIVING SYNCHRONIZATION SIGNALS IN WIRELESS ACCESS SYSTEM AND APPARATUS THEREFOR

• US 20140169361A1
• Filed: 08/23/2012
• Published: 06/19/2014
• Est. Priority Date: 08/23/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Jinmin, Han, Seunghee, Son, Hyukmin, Lee, Hyunwoo, Choi, Hyeyoung
• Granted Patent: US 9,414,337 B2
• Time in Patent Office: Days
• US Class Current: 370/350
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 27/2675 Pilot or known symbols
• CPC Class Codes: H04L 45/04 Interdomain routing, e.g. hierarchical routing
• 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: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/008 with additional processing of random access related information at receiving side
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

The present invention relates to a method for transmitting and receiving synchronization signals in a wireless access system for supporting carrier aggregation/multiple cells (CA) and an apparatus therefor. Specifically, the present invention includes the steps of transmitting a first synchronization signal through an extension carrier which is not operated as a single carrier but is operated as a part of the CA, wherein a transmission area of the first synchronization signal differs from a transmission area of a second synchronization signal which is transmitted through a legacy carrier capable of being operated as the single carrier.

Claims

1. A method of transmitting a synchronization signal in a wireless access system supporting carrier aggregation, the method comprising:

transmitting a first synchronization signal on an extension carrier not operating as a single carrier but operating as a part of the carrier aggregation only,

wherein a domain for transmitting the first synchronization signal is different from a domain for transmitting a second synchronization signal transmitted on a legacy carrier capable of operating as a single carrier.

2. The method of claim 1, wherein a frequency domain on which the first synchronization signal is transmitted corresponds to a domain where a center frequency of the frequency domain on which the first synchronization signal is transmitted is not an integer multiple of 100 kHz.

3. The method of claim 1, further comprising:

transmitting information on a space between the frequency domain on which the first synchronization signal is transmitted and a center frequency of the extension carrier via an upper layer signaling.

4. The method of claim 1, further comprising:

transmitting information on a space between a time domain in which the first synchronization signal is transmitted and a time domain in which the second synchronization signal is transmitted via an upper layer signaling.

5. The method of claim 1, wherein the first synchronization signal corresponds to at least one of a primary synchronization signal and a secondary synchronization signal.

6. The method of claim 1, wherein the first synchronization signal is transmitted one time only in a radio frame.

7. The method of claim 1, wherein the first synchronization signal is generated using a root sequence index except 25, 29, and 34.

8. A method of receiving a synchronization signal in a wireless access system supporting carrier aggregation, the method comprising:

receiving a first synchronization signal on an extension carrier not operating as a single carrier but operating as a part of the carrier aggregation only,

wherein a domain for transmitting the first synchronization signal is different from a domain for transmitting a second synchronization signal transmitted on a legacy carrier capable of operating as a single carrier.

9. The method of claim 8, wherein a frequency domain on which the first synchronization signal is transmitted corresponds to a domain where a center frequency of the frequency domain on which the first synchronization signal is transmitted is not an integer multiple of 100 kHz.

10. The method of claim 8, further comprising:

receiving information on a space between the frequency domain on which the first synchronization signal is transmitted and a center frequency of the extension carrier via an upper layer signaling.

11. The method of claim 8, further comprising:

receiving information on a space between a time domain in which the first synchronization signal is transmitted and a time domain in which the second synchronization signal is transmitted via an upper layer signaling.

12. The method of claim 8, wherein the first synchronization signal corresponds to at least one of a primary synchronization signal and a secondary synchronization signal.

13. The method of claim 8, wherein the first synchronization signal is transmitted one time only in a radio frame.

14. The method of claim 8, wherein the first synchronization signal is generated using a root sequence index except 25, 29, and 34.

15. A base station for transmitting a synchronization signal in a wireless access system supporting carrier aggregation, comprising:

an RF unit configured to transceive a radio signal; and

a processor configured to transmit a first synchronization signal on an extension carrier not operating as a single carrier but operating as a part of the carrier aggregation only,

wherein a domain for transmitting the first synchronization signal is different from a domain for transmitting a second synchronization signal transmitted on a legacy carrier capable of operating as a single carrier.

16. A user equipment for receiving a synchronization signal in a wireless access system supporting carrier aggregation, comprising a processor configured to receive a first synchronization signal on an extension carrier not operating as a single carrier but operating as a part of the carrier aggregation only,

wherein a domain for transmitting the first synchronization signal is different from a domain for transmitting a second synchronization signal transmitted on a legacy carrier capable of operating as a single carrier.