Method for detecting discovery signal in wireless communication system, and device for same

• US 9,930,515 B2
• Filed: 05/13/2015
• Issued: 03/27/2018
• Est. Priority Date: 05/15/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Jonghyun, Yi, Yunjung, Kim, Bonghoe, Kim, Kijun
• Primary Examiner(s): DEAN, JR, JOSEPH E
• Application Number:
  US15/311,498
• Publication Number:
  US 20170105112A1
• Time in Patent Office: 1,049 Days
• CPC Class Codes: H04J 11/0069 Cell search, i.e. determining cell identity [cell-ID] design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

A method for detecting a discovery signal in a wireless communication system and a device for same are disclosed. In particular, the method whereby a terminal receives a discovery signal in a wireless communication system comprises the steps of: receiving discovery quasi co-located (QCL) type configuration information for configuring a discovery QCL type; detecting a synchronization signal and obtaining a first scrambling identity (SCID); and detecting the discovery signal by using the first SCID on the basis of the configured discovery QCL type, wherein a QCL relationship between an antenna port for the discovery signal and an antenna port for the synchronization signal can be established in relation to a large-scale channel property according to the discovery QCL type.

Claims

1. A method for receiving, by user equipment, a discovery signal in a wireless communication system, the method comprising:

receiving discovery QCL type configuration information for configuring a discovery quasi co-located (QCL) type;

obtaining a first scrambling identity (SCID) by detecting a synchronization signal; and

detecting the discovery signal using the first SCID based on the configured discovery QCL type,

wherein the discovery signal is generated based on a second SCID corresponding to the first SCID, and

wherein a QCL relation is configured between an antenna port for the discovery signal and an antenna port for the synchronization signal with respect to a large-scale channel property based on the discovery QCL type.

2. The method of claim 1, wherein if the first discovery QCL type is configured based on the discovery QCL type configuration information,

the user equipment assumes that the antenna port for the discovery signal which is generated with the second SCID identical with the first SCID or mapped in a one-to-one manner and the antenna port for the synchronization signal are quasi co-located (QCL).

3. The method of claim 2, wherein the user equipment detects the discovery signal generated with the second SCID which is identical with the first SCID or mapped in a one-to-one manner.

4. The method of claim 2, wherein the large-scale channel property comprises any one of {Doppler shift, average delay} and {delay spread, Doppler spread, Doppler shift, average delay}.

5. The method of claim 2, wherein the user equipment assumes that the antenna port for the synchronization signal and an antenna port for a cell-specific reference signal are quasi co-located (QCL) with respect to Doppler shift and average delay.

6. The method of claim 2, wherein the user equipment assumes that all of an antenna port for a cell-specific reference signal, an antenna port for a demodulation reference signal, and an antenna port for a channel state information reference signal are quasi co-located (QCL).

7. The method of claim 2, wherein if a second discovery QCL type is configured based on the discovery QCL type configuration information,

the user equipment assumes that the antenna port for the discovery signal which is generated with one or more second SCIDs mapped to the first SCID and the antenna port for the synchronization signal are quasi co-located (QCL).

8. The method of claim 7, wherein the user equipment detects the discovery signal generated with the one or more second SCIDs mapped to the first SCID.

9. The method of claim 8, wherein the mapping between the first SCID and the second SCIDs is configured by a network or implicitly determined by a predetermined function or table.

10. The method of claim 7, wherein the large-scale channel property comprises any one of {average delay}, {average delay, Doppler shift}, and {average delay, Doppler shift, Doppler spread}.

11. The method of claim 7, wherein the user equipment assumes that the antenna port for the synchronization signal and an antenna port for a cell-specific reference signal are quasi co-located (QCL) with respect to Doppler shift and average delay.

12. The method of claim 7, wherein if the user equipment supports a coordinated multi-point transmission and reception (CoMP) operation,

the user equipment assumes that an antenna port for a channel state information reference signal indicated by a higher layer parameter and an antenna port for a demodulation reference signal are quasi co-located (QCL).

13. The method of claim 7, wherein if physical downlink shared channel (PDSCH) transmission mode based on a demodulation reference signal (DMRS) has been configured in the user equipment,

the user equipment assumes that an antenna port for a channel state information reference signal and an antenna port for the DMRS are quasi co-located (QCL).

14. The method of claim 7, wherein if physical downlink shared channel (PDSCH) transmission mode based on a cell-specific reference signal (CRS) has been configured in the user equipment,

the user equipment assumes that an antenna port for the CRS and antenna ports for a channel state information reference signal and a demodulation reference signal are not quasi co-located (QCL).

15. User equipment receiving a discovery signal in a wireless communication system, the user equipment comprising:

a radio frequency (RF) unit transceiving a radio signal; and

a processor controlling the user equipment,

wherein the processor is configured to;

receive discovery QCL type configuration information for configuring a discovery quasi co-located (QCL) type;

obtain a first scrambling identity (SCID) by detecting a synchronization signal; and

detect the discovery signal using the first SCID based on the configured discovery QCL type,

wherein the discovery signal is generated based on a second SCID corresponding to the first SCID, and

wherein a QCL relation is configured between an antenna port for the discovery signal and an antenna port for the synchronization signal with respect to a large-scale channel property based on the discovery QCL type.