WIRELESS COMMUNICATION SYSTEM AND METHOD FOR CONTROLLING REPORTING SETTINGS

• US 20150003362A1
• Filed: 01/24/2013
• Published: 01/01/2015
• Est. Priority Date: 01/30/2012
• Status: Abandoned Application

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Inoue, Takamichi, Hamabe, Kojiro, Kakura, Yoshikazu, Ishii, Naoto, Liu, Le
• Application Number:
  US14/375,092
• Publication Number:
  US 20150003362A1
• Time in Patent Office: Days
• US Class Current: 370/329
• 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: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• 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 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• 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: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports

Abstract

A method for controlling reporting setting that enables reporting setting to be changed quickly in a system where CoMP transmission is performed, as well as a wireless communications system using the same are provided. In a wireless communications system based on a coordinated transmission scheme in which multiple transmission stations included in a network perform transmission in coordination with each other, the network notifies multiple pieces of reporting setting information for channel state information to a reception station that is a target of the coordinated transmission scheme, and the transmission stations and the reception station share reporting setting information to be applied among the multiple pieces of reporting setting information.

Claims

1. A wireless communication system based on a coordinated transmission scheme in which multiple transmission stations included in a network perform transmission in coordination with each other, wherein

the network notifies multiple pieces of reporting setting information for channel state information to a reception station that is a target of the coordinated transmission scheme, and

the transmission stations and the reception station share a piece of reporting setting information to be applied, of the multiple pieces of reporting setting information.

2. The wireless communications system according to claim 1, wherein each of the multiple pieces of reporting setting information includes at least information for specifying a different combination of transmission stations that includes at least one transmission station as a reporting target.

3. The wireless communications system according to claim 1, wherein each of the multiple pieces of reporting setting information further includes information for specifying a feedback method from the reception station to the network that corresponds to the different combination of transmission stations.

4. The wireless communications system according to claim 1, wherein there are multiple coordinated transmission schemes, wherein the multiple pieces of reporting setting information correspond to the multiple coordinated transmission schemes, respectively.

5. The wireless communications system according to claim 1, wherein the transmission stations and the reception station dynamically share the piece of reporting setting information to be applied.

6. The wireless communications system according to claim 1, wherein intervals of updating the piece of reporting setting information to be applied are shorter than intervals of notifying the multiple pieces of reporting setting information.

7. The wireless communications system according to claim 1, wherein the piece of reporting setting information to be applied is notified between the transmission stations and the reception station only when reporting setting is changed.

8. The wireless communications system according to claim 1, wherein the piece of reporting setting information to be applied is notified between the transmission stations and the reception station every time a control signal is transmitted.

9. The wireless communications system according to claim 1, wherein the transmission stations notify the piece of reporting setting information to be applied to the reception station.

10. The wireless communications system according to claim 1, wherein the reception station notifies the piece of reporting setting information to be applied to the transmission stations.

11. The wireless communications system according to claim 1, wherein the coordinated transmission scheme is any of Joint Transmission (JT), Dynamic Point Selection (DPS), Coordinated Scheduling (CS), and Coordinated Beamforming (CB).

12. The wireless communications system according to claim 1, wherein the channel state information includes at least one of information regarding channel quality (Channel Quality Indicator:

CQI), information regarding a channel co-variance matrix (channel co-variance information), information regarding a precoding matrix (Precoding Matrix Indicator;

PMI), information regarding a transmission rank (Rank Indicator;

RI), and information regarding a difference in phase between transmission points (inter transmission point phase difference).

13. A mobile station to be a target of a coordinated transmission scheme in a wireless communication system based on the coordinated transmission scheme in which multiple transmission stations included in a network perform transmission in coordination with each other, comprising:

a reception section for receiving multiple pieces of reporting setting information for channel state information from the network; and

a control section for sharing a piece of reporting setting information to be applied, among the multiple pieces of reporting setting information, with the transmission stations.

14. The mobile station according to claim 13, wherein each of the multiple pieces of reporting setting information includes at least information for specifying a different combination of transmission stations that includes at least one transmission station as a reporting target.

15. The mobile station according to claim 13, wherein each of the multiple pieces of reporting setting information further includes information for specifying a feedback method to the network that corresponds to the different combination of transmission stations.

16. The mobile station according to claim 13, wherein there are multiple coordinated transmission schemes in the wireless communication system, wherein the multiple pieces of reporting setting information correspond to the multiple coordinated transmission schemes, respectively.

17. The mobile station according to claim 13, wherein the piece of reporting setting information to be applied is dynamically shared with the transmission stations.

18. The mobile station according to claim 13, wherein intervals of updating the piece of reporting setting information to be applied are shorter than intervals of notifying the multiple pieces of reporting setting information.

19. The mobile station according to claim 13, wherein the piece of reporting setting information to be applied is notified between the transmission stations and the mobile station only when reporting setting is changed.

20. The mobile station according to claim 13, wherein the piece of reporting setting information to be applied is notified between the transmission stations and the mobile station every time a control signal is transmitted.

21. The mobile station according to claim 13, wherein the piece of reporting setting information to be applied is received from the transmission stations.

22. The mobile station according to claim 13, wherein the piece of reporting setting information to be applied is notified to the transmission stations.

23. The mobile station according to claim 13, wherein the coordinated transmission scheme is any of Joint Transmission (JT), Dynamic Point Selection (DPS), Coordinated Scheduling (CS), and Coordinated Beamforming (CB).

24. The mobile station according to claim 13, wherein the channel state information includes at least one of information regarding channel quality (Channel Quality Indicator:

CQI), information regarding a channel co-variance matrix (channel co-variance information), information regarding a precoding matrix (Precoding Matrix Indicator;

PMI), information regarding a transmission rank (Rank Indicator;

RI), and information regarding a difference in phase between transmission points (inter transmission point phase difference).

25. A radio base station in a wireless communication system based on a coordinated transmission scheme, wherein the radio base station performs transmission to mobile stations in coordination with other radio base stations included in a network, comprising:

a transceiver for performing wireless communication with a mobile station that is a target of the coordinated transmission scheme; and

a controller for notifying the mobile station of multiple pieces of reporting setting information for channel state information and sharing a piece of reporting setting information to be applied, among the multiple pieces of reporting setting information, with the mobile station.

26. A method for controlling reporting setting in a wireless communication system based on a coordinated transmission scheme in which multiple transmission stations included in a network perform transmission in coordination with each other, comprising:

by the network, notifying multiple pieces of reporting setting information for channel state information to a reception station that is a target of the coordinated transmission scheme; and

by the transmission stations and the reception station, sharing a piece of reporting setting information to be applied among the multiple pieces of reporting setting information.

27. The method for controlling reporting setting according to claim 26, wherein each of the multiple pieces of reporting setting information includes at least information for specifying a different combination of transmission stations that includes at least one transmission station as a reporting target.

28. The method for controlling reporting setting according to claim 26, wherein each of the multiple pieces of reporting setting information further includes information for specifying a feedback method from the reception station to the network that corresponds to the different combination of transmission stations.

29. The method for controlling reporting setting according to claim 26, wherein there are multiple coordinated transmission schemes, wherein the multiple pieces of reporting setting information correspond to the multiple coordinated transmission schemes, respectively.

30. The method for controlling reporting setting according to claim 26, wherein the transmission stations and the reception station dynamically share the piece of reporting setting information to be applied.

31. The method for controlling reporting setting according to claim 26, wherein intervals of updating the piece of reporting setting information to be applied are shorter than intervals of notifying the multiple pieces of reporting setting information.

32. The method for controlling reporting setting according to claim 26, wherein the piece of reporting setting information to be applied is notified between the transmission stations and the reception station only when reporting setting is changed.

33. The method for controlling reporting setting according to claim 26, wherein the piece of reporting setting information to be applied is notified between the transmission stations and the reception station every time a control signal is transmitted.

34. The method for controlling reporting setting according to claim 26, wherein the transmission stations notify the piece of reporting setting information to be applied to the reception station.

35. The method for controlling reporting setting according to claim 26, wherein the reception station notifies the piece of reporting setting information to be applied to the transmission stations.