METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CHANNEL INFORMATION IN INTER-VEHICLE COMMUNICATION SYSTEM

• US 20180205432A1
• Filed: 04/21/2016
• Published: 07/19/2018
• Est. Priority Date: 05/25/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Heejin, Kang, Jiwon, Kim, Kitae, Lee, Kilbom, Park, Kungmin
• Granted Patent: US 10,567,055 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04B 7/061 using feedback from receiving side
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0634 Antenna weights or vector/matrix coefficients
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04B 7/08 at the receiving station
• CPC Class Codes: H04B 7/0802 using antenna selection H04B7/0868 takes precedence; antenna beam directivity switching H01Q3/24
• CPC Class Codes: H04W 4/44 for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]

Abstract

The present specification relates to a method by which a terminal transmits channel information to a base station in an inter-vehicle communication system. The method for transmitting channel information can comprise the steps of: measuring channel information and feeding the same back to the base station; and receiving data on the basis of the channel information. The terminal comprises a plurality of distributed antenna units (DU), and when it is possible to select whether to activate each of the plurality of DUs, a plurality of channel information sets are measured according to the number and the location of activated DUs, and the channel information to be fed back can include the plurality of channel information sets.

Claims

1. A method of transmitting channel information from a user equipment (UE) to a base station in a vehicular communication system, the method comprising:

measuring and feeding channel information back to the base station; and

receiving data based on the channel information,

wherein the UE includes a plurality of distributed antenna units (DUs) and a plurality of channel information sets is measured according to the number and locations of activated DUs when activation of each of the plurality of DUs is selectable, and

wherein the fed-back channel information is composed of the plurality of channel information sets.

2. The method according to claim 1, wherein the fed-back channel information includes all channel information sets combinable according to the number and locations of activated DUs.

3. The method according to claim 2, wherein, the number of all channel information sets combinable according to the number and locations of activated DUs is 2̂

N when the number of DUs included in the UE is N.

4. The method according to claim 1, wherein the fed-back channel information includes only some of all channel information sets combinable according to the number and locations of activated DUs.

5. The method according to claim 4, wherein, the fed-back channel information includes only channel information sets for the fixed number of DUs when the number of activated DUs is fixed.

6. The method according to claim 1, wherein the channel information set includes information on a precoding matrix indicator (PMI), a channel quality indicator (CQI) and a rank indicator (RI).

7. The method according to claim 6, wherein the channel information set further includes information on at least one multiuser-CQI (MU-CQI).

8. The method according to claim 6, wherein the channel information set further includes information on at least one of a first companion beam and a second companion beam.

9. The method according to claim 8,

wherein the first companion beam is precoder information for minimizing interference with the UE based on the fed-back PMI, and

wherein the second companion beam is precoder information for maximizing interference with the UE based on the fed-back PMI.

10. The method according to claim 9, wherein the information on the first companion beam and the second companion beam is fed back only when the number and locations of activated DUs are fixed.

11. The method according to claim 9, wherein the first companion beam and the second companion beam are determined based on precoder information of adjacent UEs of the UE.

12. The method according to claim 11, wherein the UE receives precoder information of the adjacent UEs from the adjacent UEs through direct communication.

13. The method according to claim 11, wherein the UE receives the precoder information of the adjacent UEs from the base station.

14. The method according to claim 13, wherein the base station receives the precoder information from the UE and the adjacent UEs and provides the precoder information of the adjacent UEs to the UE through broadcasting.

15. A user equipment (UE) apparatus for transmitting and receiving channel information in a vehicular communication system, the UE apparatus comprising:

a transceiver module configured to transmit and receive information to and from an external device;

a processor configured to control the transceiver module,

wherein the processor is further configured to;

measures channel information,

feeds the measured channel information back to a base station using the transceiver module; and

receives data based on the channel information using the transceiver module,

wherein the UE includes a plurality of distributed antenna units (DUs), a plurality of channel information sets is measured according to the number and locations of activated DUs when activation of each of the plurality of DUs is selectable, and

wherein the fed-back channel information is composed of the plurality of channel information sets.