RADIO COMMUNICATION SYSTEM AND COMMUNICATION METHOD

• US 20150304018A1
• Filed: 02/21/2013
• Published: 10/22/2015
• Est. Priority Date: 02/24/2012
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: PITAKDUMRONGKIJA, Boonsarn, KAKURA, Yoshikazu, ISHII, Naoto
• Granted Patent: US 9,577,740 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/15592 Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path cooperative diversity H04B7/024
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 84/047 using dedicated repeater stations
• CPC Class Codes: H04W 92/20 between access points

Abstract

A communication system includes a plurality of DeNBs (base stations) and a plurality of RNs (relay nodes), wherein each RN has a radio connection with a DeNB. Each DeNB acquires time resource configuration applied between another base station and a relay node connected with said another base station.

Claims

1. A communication system comprising a plurality of communication nodes which includes a plurality of base stations and a plurality of relay nodes, wherein each relay node has a radio connection with a base station,

wherein each base station acquires time resource configuration applied between another base station and a relay node connected with said another base station.

2. The communication system of claim 1, wherein each base station acquires the time resource configuration based on information indicating time resource configuration applied at the relay node connected with said another base station.

3. The communication system of claim 2, wherein a first relay node connected with the base station acquires the information and reports it to the base station.

4. The communication system of claim 3, wherein the first relay node acquires the information based on system information broadcasted by the relay node connected with said another base station.

5. The communication system of claim 4, wherein the system information includes the information indicating backhaul subframe configuration applied at the relay node connected with said another base station.

6. The communication system of claim 3, wherein the first relay node acquires the information by detecting transmission of downlink data by the relay node connected with said another base station.

7. The communication system of claim 6, wherein the first relay node determines the information indicating backhaul subframe configuration applied at the relay node connected with said another base station, wherein the relay node connected with said another base station transmits the downlink data at subframes other than backhaul subframes in the backhaul subframe configuration.

8. The communication system of claim 2, wherein each base station receives the information from said another base station.

9. The communication system of claim 8, wherein each base station requests that said another base station to report the information.

10. The communication system of claim 1, wherein each base station acquires the time resource configuration based on information indicating time resource configuration applied at said another base station.

11. The communication system of claim 10, wherein each base station requests that said another base station to report the information.

12. A communication method in a communication system comprising a plurality of communication nodes which includes a plurality of base stations and a plurality of relay nodes, wherein each relay node has a radio connection with a base station, the method comprising:

at each base station,

acquiring time resource configuration applied between another base station and a relay node connected with said another base station.

13. The communication method of claim 12, wherein the time resource configuration is acquired based on information indicating time resource configuration applied at the relay node connected with said another base station.

14. The communication method of claim 13, further comprising:

at a first relay node connected with the base station,

acquiring the information; and

reporting the information to the base station.

15. The communication method of claim 14, wherein

at the first relay node,

acquiring the information based on system information broadcasted by the relay node connected with said another base station.

16. The communication method of claim 15, wherein the system information includes the information indicating backhaul subframe configuration applied at the relay node connected with said another base station.

17. The communication method of claim 14, wherein the step of acquiring the information comprises:

detecting transmission of downlink data by the relay node connected with said another base station; and

acquiring the information based on the detected transmission of the downlink data.

18. The communication method of claim 17, wherein the relay node connected with said another base station transmits the downlink data at subframes other than backhaul subframes in the backhaul subframe configuration, wherein the first relay node determines the information indicating backhaul subframe configuration applied at the relay node connected with said another base station.

19. The communication method of claim 13, wherein each base station receives the information from said another base station.

20. The communication method of claim 19, wherein each base station requests that said another base station to report the information.

21. The communication method of claim 12, wherein the time resource configuration is acquired based on information indicating time resource configuration applied at said another base station.

22. The communication method of claim 21, wherein each base station requests that said another base station to report the information.

23. A base station in a communication system comprising a plurality of communication nodes which includes a plurality of base station and a plurality of relay nodes, wherein each relay node has a radio connection with a base station, comprising:

a communication section for communicating with a relay node by a radio interface and communicating with another base station by a predetermined interface; and

a controller for acquiring time resource configuration applied between another base station and a relay node connected with said another base station.

24. The base station of claim 23, wherein the controller acquires the time resource configuration based on information indicating time resource configuration applied at the relay node connected with said another base station.

25. The base station of claim 24, wherein the communication section receives the information from a first relay node connected with the base station.

26. The base station of claim 24, wherein the communication section receives the information from said another base station.

27. The base station of claim 26, wherein the controller requests that said another base station to report the information.

28. The base station of claim 23, wherein the controller acquires the time resource configuration based on information indicating time resource configuration applied at said another base station.

29. The base station of claim 28, wherein the controller requests that said another base station to report the information.

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