Method for transmitting and receiving synchronization signals in wireless access system and apparatus therefor

• US 9,414,337 B2
• Filed: 08/23/2012
• Issued: 08/09/2016
• 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
• Primary Examiner(s): Moore, Ian N
• Assistant Examiner(s): Van Roie, Justin T
• Application Number:
  US14/236,051
• Publication Number:
  US 20140169361A1
• Time in Patent Office: 1,447 Days
• Field of Search: None
• US Class Current: 1/1
• 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 resource region for transmitting the first synchronization signal is different from a resource region for transmitting a second synchronization signal transmitted on a legacy carrier capable of operating as a single carrier,

wherein a frequency area of the resource region, on which the first synchronization signal is transmitted, corresponds to a frequency area where a center frequency of the frequency area of the resource region, on which the first synchronization signal is transmitted, is not an integer multiple of 100 kHz,

wherein if the first synchronization signal corresponds to a primary synchronization signal and a secondary synchronization signal, one of the primary synchronization signal or the secondary synchronization signal is transmitted in a first subframe of a radio frame, and another of the primary synchronization signal or the secondary synchronization signal is transmitted in a sixth subframe of the radio frame,

wherein if the first synchronization signal corresponds to only one of the primary synchronization signal or the secondary synchronization signal, the one of the primary synchronization signal or the secondary synchronization signal is transmitted in only one of the first or the sixth subframes of the radio frame, and

wherein, when the radio frame is configured to transmit both the primary synchronization signal and the secondary synchronization signal, the another one of the primary synchronization signal or the secondary synchronization signal transmitted in the sixth subframe is frequency hopped; and

transmitting information on a space between the first synchronization signal and the second synchronization signal.

2. The method of claim 1,

wherein the space between the first synchronization signal and the second synchronization signal comprises a space between a time area of the resource region in which the first synchronization signal is transmitted and a time area of the resource region in which the second synchronization signal is transmitted via an upper layer signaling.

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

4. 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 resource region for receiving the first synchronization signal is different from a resource region for receiving a second synchronization signal that is transmitted on a legacy carrier capable of operating as a single carrier,

wherein a frequency area of the resource region, on which the first synchronization signal is received, corresponds to a frequency area where a center frequency of the frequency area of the resource region, on which the first synchronization signal is received, is not an integer multiple of 100 kHz,

wherein if the first synchronization signal corresponds to a primary synchronization signal and a secondary synchronization signal, one of the primary synchronization signal or the secondary synchronization signal is received in a first subframe of a radio frame, and another of the primary synchronization signal or the secondary synchronization signal is received in a sixth subframe of the radio frame,

wherein if the first synchronization signal corresponds to only one of the primary synchronization signal or the secondary synchronization signal, the one of the primary synchronization signal or the secondary synchronization signal is received in only one of the first or the sixth subframes of the radio frame, and

wherein, when the radio frame is configured for both the primary synchronization signal and the secondary synchronization signal, the another one of the primary synchronization signal or the secondary synchronization signal received in the sixth subframe is frequency hopped; and

receiving information on a space between the first synchronization signal and the second synchronization signal.

5. The method of claim 4,

wherein the space between the first synchronization signal and the second synchronization signal comprises a space between a time area of the resource region in which the first synchronization signal is received and a time area of the resource region in which the second synchronization signal is received via an upper layer signaling.

6. The method of claim 4, wherein the first synchronization signal is generated using a root sequence index except 25, 29, and 34.

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

a Radio Frequency 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 resource region for transmitting the first synchronization signal is different from a resource region for transmitting a second synchronization signal transmitted on a legacy carrier capable of operating as a single carrier,

wherein a frequency area of the resource region, on which the first synchronization signal is transmitted, corresponds to a frequency area where a center frequency of the frequency area of the resource region, on which the first synchronization signal is transmitted, is not an integer multiple of 100 kHz,

wherein if the first synchronization signal corresponds to a primary synchronization signal and a secondary synchronization signal, one of the primary synchronization signal or the secondary synchronization signal is transmitted in a first subframe of a radio frame, and another of the primary synchronization signal or the secondary synchronization signal is transmitted in a sixth subframe of the radio frame,

wherein if the first synchronization signal corresponds to only one of the primary synchronization signal or the secondary synchronization signal, the one of the primary synchronization signal or the secondary synchronization signal is transmitted in only one of the first or the sixth subframes of the radio frame,

wherein, when the radio frame is configured to transmit both the primary synchronization signal and the secondary synchronization signal, the another one of the primary synchronization signal or the secondary synchronization signal transmitted in the sixth subframe is frequency hopped, and

wherein the processor is further configured to transmit information on a space between the first synchronization signal and the second synchronization signal.

8. 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; and

a memory and radio frequency unit each operatively coupled to the processor,

wherein a resource region for receiving the first synchronization signal is different from a resource region for receiving a second synchronization signal that is transmitted on a legacy carrier capable of operating as a single carrier,

wherein a frequency area of the resource region, on which the first synchronization signal is received, corresponds to a frequency area where a center frequency of the frequency area of the resource region, on which the first synchronization signal is received, is not an integer multiple of 100 kHz,

wherein if the first synchronization signal corresponds to a primary synchronization signal and a secondary synchronization signal, one of the primary synchronization signal or the secondary synchronization signal is received in a first subframe of a radio frame, and another of the primary synchronization signal or the secondary synchronization signal is received in a sixth subframe of the radio frame,

wherein if the first synchronization signal corresponds to only one of the primary synchronization signal or the secondary synchronization signal, the one of the primary synchronization signal or the secondary synchronization signal is received in only one of the first or the sixth subframes of the radio frame,

wherein, when the radio frame is configured for both the primary synchronization signal and the secondary synchronization signal, the another one of the primary synchronization signal or the secondary synchronization signal received in the sixth subframe is frequency hopped, and

wherein the processor is further configured to receive information on a space between the first synchronization signal and the second synchronization signal.