Method and apparatus for receiving control information in wireless communication system

Patent metadata

Field	Value
Publication number	US-9549400-B2
Application number	US-201314420878-A
Country	US
Kind code	B2
Filing date	Aug 5, 2013
Priority date	Aug 10, 2012
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

One embodiment of the present invention relates to a method for receiving control information through an enhanced physical downlink control channel (EPDCCH) in a wireless communication system, including the steps of: channel estimation in an EPDCCH related physical resource block (PRB) pair set; and, on the basis of the channel estimation, monitoring the EPDCCH in the PRB pair set, wherein, when the number of physical antennas of a transmission point transmitting the EPDCCH is 1, the terminal is assumed to identically precode allocated ports for the EPDCCH.

First claim

The invention claimed is:

1. A method for a User Equipment (UE) receiving control information via an Enhanced Physical Downlink Control Channel (EPDCCH) in a wireless communication system, the method comprising:
performing channel estimation on a Physical Resource Block (PRB) pair set related to the EPDCCH; and
monitoring the EPDCCH in the PRB pair set based on the performed channel estimation,
wherein a plurality of Demodulation Reference Signal (DMRS) ports is allocated with same precoding applied to the plurality of DMRS ports when a transmission point transmitting the EPDCCH uses a single physical antenna, and
wherein the plurality of DMRS ports are used for performing the channel estimation.

2. The method according to claim 1 , wherein the transmission point is one of a plurality of transmission points configured to transmit an EPDCCH to the UE.

3. The method according to claim 1 , wherein the same precoding applied to the plurality of DMRS ports only when a representative antenna port is not used and the PRB pair set is for localized EPDCCH transmission.

4. The method according to claim 1 , further comprising determining that the PRB pair set is for distributed EPDCCH transmission.

5. The method according to claim 4 , wherein the channel estimation is performed using a DMRS corresponding to a port related to the distributed EPDCCH transmission.

6. The method according to claim 1 , wherein a number of the physical antennas is determined according to a number of Cell-specific Reference Signal (CRS) ports of the transmission point.

7. The method according to claim 6 , further comprising determining the number of CRS ports as the number of the physical antennas.

8. The method according to claim 6 , further comprising determining the number of CRS ports by blind decoding of a Physical Broadcast Channel.

9. The method according to claim 1 , wherein a number of the physical antennas is determined according to a number of ports used for Channel State Information-Reference Signal (CSI-RS) transmission from the transmission point.

10. The method according to claim 9 , wherein information about the transmission point and the number of ports is transmitted via higher-layer signaling.

11. The method according to claim 9 , wherein the transmission point uses a CSI-RS configuration having an initial value equal to an initial scrambling sequence value of a DMRS related to the EPDCCH.

12. A User Equipment (UE) for receiving control information on an Enhanced Physical Downlink Control Channel (EPDCCH) in a wireless communication system, the UE comprising:
a reception module; and
a processor configured to:
perform channel estimation on a Physical Resource Block (PRB) pair set related to the EPDCCH, and
monitor the EPDCCH in the PRB pair set based on the performed channel estimation,
wherein a plurality of Demodulation Reference Signal (DMRS) ports is allocated with same precoding applied to the plurality of DMRS ports when a transmission point transmitting the EPDCCH uses a single physical antenna, and
wherein the plurality of DMRS ports are used for performing the channel estimation.

13. The UE according to claim 12 , wherein the transmission point is one of a plurality of transmission points configured to transmit an EPDCCH to the UE.

14. The UE according to claim 12 , wherein the same precoding is applied to the plurality of DMRS ports only when a representative antenna port is not used and the PRB pair set is for localized EPDCCH transmission.

15. The UE according to claim 12 , wherein the processor is further configured to determine that the PRB pair set is for distributed EPDCCH transmission.

16. The UE according to claim 15 , wherein the channel estimation is performed using a DMRS corresponding to a port related to distributed the EPDCCH transmission.

17. The UE according to claim 12 , wherein a number of the physical antennas is determined according to a number of Cell-specific Reference Signal (CRS) ports of the transmission point.

18. The UE according to claim 17 , wherein the processor is further configured to determine the number of CRS ports as the number of the physical antennas.

19. The UE according to claim 12 , wherein a number of the physical antennas is determined according to a number of ports used for Channel State Information-Reference Signal (CSI-RS) transmission from the transmission point.

20. UE according to claim 19 , wherein the transmission point uses a CSI-RS configuration having an initial value equal to an initial scrambling sequence value of a DMRS related to the EPDCCH.

Assignees

• Lg Electronics Inc

Inventors

• Seo Inkwon
• Seo Hanbyul

Classifications

• H04L5/0053 Primary

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04L5/0023

  Time-frequency-space · CPC title

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L25/0202

  Channel estimation · CPC title