METHOD AND DEVICE FOR PERFORMING COORDINATED MULTI-POINT TRANSMISSION BASED ON SELECTION OF TRANSMISSION POINT

• US 20160105882A1
• Filed: 07/29/2014
• Published: 04/14/2016
• Est. Priority Date: 07/29/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: PARK, Jonghyun, KIM, Kijun, KIM, Hyungtae
• Granted Patent: US 9,749,996 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 92/20 between access points

Abstract

A method of performing, by means of a first transmission point, coordinated multi-point transmission based on the selection of a transmission point according to an embodiment of the present invention includes: selecting a second transmission point from among one or more candidate transmission points participating in the coordinated multi-point transmission; and transmitting a message to the second transmission point to request that the second transmission point transmits a physical downlink shared channel (PDSCH) to a terminal served by the first transmission point, wherein the message indicates a time duration for which the PDSCH is transmitted by the second transmission point.

Claims

1. A method of performing coordinated multi-point operation by a first transmission point based on transmission point selection, the method comprising:

selecting a second transmission point from one or more candidate transmission points participating in the coordinated multi-point; and

transmitting, to the second transmission point, a message for requesting to transmit a physical downlink shared channel (PDSCH) to a user equipment served by the first transmission point,

wherein the message indicates a duration in which the PDSCH is transmitted by the second transmission point.

2. The method of claim 1, further comprising:

reselecting a transmission point for transmitting the PDSCH which was transmitted by the second transmission point from the candidate transmission points, after the duration is expired.

3. The method of claim 1, further comprising:

transmitting, by the first transmission point, the PDSCH which was transmitted by the second transmission point, according to the expiration of the duration.

4. The method of claim 1, wherein:

the message comprises at least a part of radio resource control (RRC) configuration information configured in the user equipment by the first transmission point via RRC signaling and

the PDSCH is coded or scheduled using the at least a part of the RRC configuration information.

5. The method of claim 1, further comprising:

receiving a demodulation reference signal (DMRS) configuration from the second transmission point; and

configuring the received DMRS configuration to the user equipment via RRC signaling,

wherein a downlink DMRS based on the DMRS configuration is mapped to a region of the PDSCH during the duration.

6. The method of claim 1, wherein:

the message is transmitted via a backhaul interface between the first transmission point and the second transmission point and

a size of transmission latency of the backhaul interface is smaller than a size of transmission latency according to RRC signaling for the user equipment.

7. The method of claim 1, further comprising:

transmitting, to the second transmission point, information on periodic or aperiodic channel state information (CSI) feedback configuration configured in the user equipment by the first transmission point via radio resource control (RRC) signaling.

8. The method of claim 7, wherein the PDSCH is coded or scheduled by the second transmission point which has obtained a CSI report of the user equipment based on the CSI feedback configuration, during the duration.

9. The method of claim 1, wherein a specific evolved physical downlink control channel (EPDCCH) set among a plurality of EPDCCH sets configured in the user equipment, is assigned to the second transmission point during the duration.

10. The method of claim 9, wherein the specific EPDCCH set assigned to the second transmission point is used for scheduling the PDSCH scheduled by the second transmission point or triggering an aperiodic channel state information (CSI) report.

11. The method of claim 10, wherein if first uplink transmission according to an uplink grant by the first transmission point and second uplink transmission according to the triggering of the aperiodic CSI report by the second transmission point are competed with each other during the duration, the first uplink transmission is preferentially performed.

12. The method of claim 1, wherein the selecting of the second transmission point comprises selecting the second transmission point based on information on a traffic load of the candidate transmission points collected from the candidate transmission points.

13. The method of claim 1, further comprising:

determining a length and a position of the duration via negotiation with the second transmission point.

14. The method of claim 1, further comprising:

transmitting, to the second transmission point, at least one of a physical uplink control channel (PUCCH) configuration configured in the user equipment via RRC, a uplink demodulation reference signal (DMRS) configuration, a uplink power control configuration, a timing advance (TA) control configuration, a channel state information (CSI) process configuration and a PDSCH RE mapping and quasi co-location indicator (PQI) field configuration.

15. A method of performing coordinated multi-point operation by a second transmission point based on transmission point selection, comprising:

receiving, from the first transmission point, at least a part of a radio resource control (RRC) configuration configured in a user equipment served by a first transmission point;

receiving, from the first transmission point, a message for requesting to transmit a physical downlink shared channel (PDSCH) to the user equipment; and

transmitting the PDSCH to the user equipment based on the at least a part of the RRC configuration during a duration indicated by the message.

16. The method of claim 15,

wherein the receiving the at least a part of the RRC configuration comprises receiving a demodulation reference signal (DMRS) configuration configured in the user equipment and

wherein the transmitting the PDSCH to the user equipment comprises transmitting a downlink DMRS generated based on the DMRS configuration, via a region of the PDSCH.

17. The method of claim 15, wherein the receiving the at least a part of the RRC configuration comprises receiving periodic or aperiodic channel state information (CSI) configuration configured in the user equipment and

wherein the PDSCH is coded or scheduled based on a CSI report obtained from the user equipment using the CSI configuration.

18. A transmission point performing coordinated multi-point operation based on transmission point selection, comprising:

a radio frequency (RF) interface configured to transceive a radio signal with a user equipment served by the transmission point;

a backhaul interface configured to transceive a backhaul link signal with one or more candidate transmission points participating in the coordinated multi-point; and

a processor configured to control the backhaul interface to select a prescribed transmission point from the candidate transmission points and transmit a message for requesting to transmit a physical downlink shared channel (PDSCH) to the user equipment to the prescribed transmission point,

wherein the message indicates a duration in which the PDSCH is transmitted by the prescribed transmission point.

19. A transmission point performing coordinated multi-point operation based on transmission point selection, comprising:

a backhaul interface configured to receive at least a part of a radio resource control (RRC) configuration configured in a user equipment served by a prescribed transmission point from the prescribed transmission point and receive a message for requesting to transmit a physical downlink shared channel (PDSCH) to the user equipment from the prescribed transmission point; and

a radio frequency (RF) interface configured to transmit the PDSCH to the user equipment based on the at least a part of the RRC configuration during a duration indicated by the message.