Method and apparatus for transreceiving synchronization signal in wireless communication system

Patent metadata

Field	Value
Publication number	US-9419759-B2
Application number	US-201214239062-A
Country	US
Kind code	B2
Filing date	Aug 14, 2012
Priority date	Aug 15, 2011
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

One embodiment of the present invention relates to a method for a terminal acquiring synchronization in a wireless communication system, comprising the steps of: receiving a first signal from on a first carrier; receiving a second signal, which is positioned on a resource element having a predetermined pattern, from at least one subframe from subframes excluding the subframe that receives the first signal; and acquiring synchronization with respect to the first carrier by using the first signal and the second signal.

First claim

The invention claimed is:

1. A method for acquiring synchronization, at a user equipment in a wireless communication system, the method comprising:
receiving a primary synchronization signal (PSS) without a secondary synchronization signal (SSS) in a first subframe via an extension carrier, the PSS being different from a common reference signal (CRS) and a dedicated reference signal (DRS);
receiving a channel state information-reference signal (CSI-RS) on resource blocks (RBs) in one or more second subframes other than the first subframe; and
acquiring the synchronization for the extension carrier using the PSS and the CSI-RS instead of using the SSS,
wherein when the CSI-RS is used for the synchronization with the extension carrier, the resource blocks (RBs) for the CSI-RS are determined by the following formula:
n ( N ID cell mod └ N DL RB /n ┘)+ i, i= 0, . . . , n,

where ‘n’ denotes a total number of the RBs carrying the CSI-RS, N ID cell denotes a cell identifier of a base station, and N DL RB denotes a number of resource blocks included in the entire frequency band of the extension carrier.

2. The method according to claim 1 , wherein accessibility of the extension carrier depends on user equipment capability.

3. The method according to claim 1 , wherein the extension carrier is indicated by the physical downlink control channel of a non-extension carrier.

4. The method according to claim 1 , wherein the RBs carrying the CSI-RS are discontinuously distributed over an entire frequency band of the extension carrier, and wherein the total number of the discontinuously distributed RBs carrying the CSI-RS depends on a size of the entire frequency band of the extension carrier.

5. The method according to claim 1 , wherein frequency hopping is applied to the locations of the RBs in accordance with a corresponding subframe of the one or more second subframes.

6. The method according to claim 1 , wherein the one or more second subframes are determined in accordance with the cell identifier of a base station.

7. The method according to claim 1 , wherein an index of the first subframe within a frame is ‘0’ or ‘5’.

8. The method according to claim 1 , wherein the primary synchronization signal has a predetermined root index excluding ‘25’, ‘29’ and ‘34’.

9. A method of transmitting a signal for synchronization acquisition, which is transmitted by a base station in a wireless communication system, comprising:
transmitting a primary synchronization signal (PSS) without a secondary synchronization signal (SSS) in a first subframe via an extension carrier, the PSS being different from a common reference signal (CRS) and a dedicated reference signal (DRS); and
transmitting a channel state information-reference signal (CSI-RS) on resource blocks (RBs) in or more second subframes other than the first subframe,
wherein the CSI-RS is provided for a user equipment to acquire synchronization for the extension carrier instead of the SSS, and
wherein when the CSI-RS is used for the synchronization with the extension carrier, the resource blocks (RBs) for the CSI-RS are determined by the following formula:
n ( N ID cell mod └ N DL RB /n ┘)+ i, i= 0, . . . , n,

where ‘n’ denotes a total number of the RBs carrying the CSI-RS, N ID cell denotes a cell identifier of a base station, N DL RB denotes a number of resource blocks included in the entire frequency band of the extension carrier.

10. A user equipment comprising:
a receiver that receives a primary synchronization signal (PSS) without a secondary synchronization signal (SSS) in a first subframe via an extension carrier, the PSS being different from a common reference signal (CRS) and a dedicated reference signal (DRS), and to receive a channel state information-reference signal (CSI-RS) on resource blocks (RBs) in one or more second subframes other than the first subframe; and
a processor that acquires the synchronization for the extension carrier using the PSS and the CSI-RS instead of using the SSS,
wherein when the CSI-RS is used for the synchronization with the extension carrier, the resource blocks (RBs) for the CSI-RS are determined by the following formula:
n ( N ID cell mod └ N DL RB /n ┘)+ i, i= 0, . . . , n,

where ‘n’ denotes a total number of the RBs carrying the CSI-RS, N ID cell denotes a cell identifier of a base station, and N DL RB denotes a number of resource blocks included in the entire frequency band of the extension carrier.

11. A base station comprising:
a transmitter that transmits a primary synchronization signal (PSS) without a secondary synchronization signal (SSS) in a first subframe via an extension carrier, the PSS being different from a common reference signal (CRS) and a dedicated reference signal (DRS), and transmits a channel state information-reference signal (CSI-RS) on resource blocks (RBs) in one or more second subframes other than the first subframe; and
a processor that controls the transmitter,
wherein the CSI-RS is provided for a user equipment to acquire synchronization for the extension carrier instead of the SSS, and
wherein when the CSI-RS is used for the synchronization with the extension carrier, the resource blocks (RBs) for the CSI-RS are determined by the following formula:
n ( N ID cell mod └ N DL RB /n ┘)+ i, i= 0, . . . , n,

where ‘n’ denotes a total number of the RBs carrying the CSI-RS, N ID cell denotes a cell identifier of a base station, and N DL RB denotes a number of resource blocks included in the entire frequency band of the extension carrier.

Assignees

• Choi Hyeyoung
• Kim Jinmin
• Han Seunghee
• Son Hyukmin
• Lee Hyunwoo
• Lg Electronics Inc

Inventors

• Choi Hyeyoung
• Kim Jinmin
• Han Seunghee
• Son Hyukmin
• Lee Hyunwoo

Classifications

• H04L27/2655

  Synchronisation arrangements · CPC title

• H04L27/2675

  Pilot or known symbols · CPC title

• H04L27/2607

  Cyclic extensions · CPC title

• H04L5/005

  of common pilots, i.e. pilots destined for multiple users or terminals · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title