Method and apparatus for transreceiving downlink signal by considering antenna port relationship in wireless communication system

• US 10,004,065 B2
• Filed: 06/06/2017
• Issued: 06/19/2018
• Est. Priority Date: 10/04/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Jonghyun, Kim, Kijun, Seo, Hanbyul
• Primary Examiner(s): Cho, Hong
• Application Number:
  US15/615,420
• Publication Number:
  US 20170273061A1
• Time in Patent Office: 378 Days
• Field of Search: None
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0426 Power distribution
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 12/18 for broadcast or conference , e.g. multicast
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 4/025 using location based information parameters
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 72/046 the resource being in the space domain, e.g. beams
• CPC Class Codes: H04W 72/12 : Wireless traffic scheduling
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/30 : Resource management for broadcast services

Abstract

The present invention relates to a wireless communication system, and more specifically, disclosed are a method and an apparatus for transmitting or receiving a downlink signal by considering an antenna port relationship. A method for user equipment receiving a physical downlink shared channel (PDSCH) signal in the wireless communication system, according to one embodiment of the present invention, comprises the steps of: determining from the downlink subframe a resource element (RE) on which the PDSCH is mapped; and receiving the PDSCH signal based on the RE on which the PDSCH is mapped, wherein when the DCI is comprised according to DCI format 1A and the downlink subframe is a multicast broadcast single frequency network (MBSFN) subframe, the RE on which the PDSCH is mapped can be determined depending on cell-specific reference signal (CRS) location information, which is included in a PDSCH resource element mapping and Quasi co-location indicator (PQI) parameter set that is established by an upper layer.

Claims

1. A method for transmitting a physical downlink shared channel (PDSCH) by a base station (BS) in a wireless communication system, the method comprising:

transmitting one or more PDSCH resource element and Quasi co-location Indicator (PQI) parameter sets;

generating downlink control information (DCI) according to DCI format 1A or DCI format 2D; and

transmitting the PDSCH in a downlink subframe according to the DCI,

wherein when the DCI is generated according to the DCI format 2D, the BS determines a PDSCH resource element (RE) in the downlink subframe according to a PQI parameter set indicated by the DCI among the one or more PQI parameter sets, and

wherein when the DCI is generated according to the DCI format 1A, and the downlink subframe is a Multicast Broadcast Single Frequency Network (MBSFN) subframe, the BS determines the PDSCH RE according to a lowest indexed PQI parameter set among the one or more PQI parameter sets.

2. The method according to claim 1, wherein each of the one or more PQI parameter sets includes at least one of a cell-specific reference signal (CRS) position parameter, a zero-power channel state information-reference signal (ZP CSI-RS) parameter, a PDSCH start symbol parameter, and a non-ZP CSI-RS (NZP CSI-RS) parameter.

3. The method according to claim 2, wherein the CRS position parameter comprises at least one of number-of-CRS ports information, CRS frequency shift information and MBSFN subframe configuration information.

4. The method according to claim 1, wherein when the DCI is generated according to the DCI format 1A and the downlink subframe is a non-MBSFN subframe, the PDSCH RE is determined according to a CRS configuration of a serving cell.

5. The method according to claim 4, wherein the CRS configuration of the serving cell comprises at least one of a number of CRS ports of the serving cell, CRS frequency shift of the serving cell and an MBSFN subframe configuration of the serving cell.

6. The method according to claim 1, wherein when the DCI is generated according to the DCI format 2D, the PQI parameter set used for determining the PDSCH RE is indicated by a state value of a PQI field of the DCI format 2D.

7. The method according to claim 6, wherein the DCI format 1A does not include the PQI field.

8. The method according to claim 1, further comprising:

transmitting, through a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH), the DCI scheduling the PDSCH.

9. The method according to claim 1, wherein the PDSCH is transmitted to a user equipment (UE) configured with a transmission mode 10 (TM10) for a coordinated multi-point (CoMP) operation.

10. A non-transitory computer readable medium recorded thereon a program for executing the method of claim 1.

11. A base station (BS) for transmitting a physical downlink shared channel (PDSCH) in a wireless communication system, the BS comprising:

a transmitter;

a processor generates downlink control information (DCI) according to DCI format 1A or DCI format 2D and controls the transmitter to transmit one or more PDSCH resource element and Quasi co-location Indicator (PQI) parameter sets and to transmit the PDSCH in a downlink subframe according to the DCI,

wherein when the DCI is generated according to the DCI format 2D, the processor determines a PDSCH resource element (RE) in the downlink subframe according to a PQI parameter set indicated by the DCI among the one or more PQI parameter sets, and

wherein when the DCI is generated according to the DCI format 1A, and the downlink subframe is a Multicast Broadcast Single Frequency Network (MBSFN) subframe, the processor determines the PDSCH RE according to a lowest indexed PQI parameter set among the one or more PQI parameter sets.

12. The BS according to claim 11, wherein each of the one or more PQI parameter sets includes at least one of a cell-specific reference signal (CRS) position parameter, a zero-power channel state information-reference signal (ZP CSI-RS) parameter, a PDSCH start symbol parameter, and a non-ZP CSI-RS (NZP CSI-RS) parameter.

13. The BS according to claim 11, wherein the CRS position parameter comprises at least one of number-of-CRS ports information, CRS frequency shift information and MBSFN subframe configuration information.

14. The BS according to claim 11, wherein when the DCI is generated according to the DCI format 1A and the downlink subframe is a non-MBSFN subframe, the PDSCH RE is determined according to a CRS configuration of a serving cell.

15. The BS according to claim 14, wherein the CRS configuration of the serving cell comprises at least one of a number of CRS ports of the serving cell, CRS frequency shift of the serving cell and an MBSFN subframe configuration of the serving cell.

16. The BS according to claim 11, wherein when the DCI is generated according to the DCI format 2D, the PQI parameter set used for determining the PDSCH RE is indicated by a state value of a PQI field of the DCI format 2D.

17. The BS according to claim 16, wherein the DCI format 1A does not include the PQI field.

18. The BS according to claim 11, the processor controls the transmitter to transmit, through a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH), the DCI scheduling the PDSCH.

19. The BS according to claim 11, wherein the PDSCH is transmitted to a user equipment (UE) configured with a transmission mode 10 (TM10) for a coordinated multi-point (CoMp) operation.