RADIO BASE STATION, RADIO COMMUNICATION SYSTEM AND RADIO COMMUNICATION METHOD

• US 20160143042A1
• Filed: 05/27/2014
• Published: 05/19/2016
• Est. Priority Date: 06/14/2013
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Nagata, Satoshi, Na, Chongning, Hou, Xiaolin, Harada, Atsushi
• Granted Patent: US 9,788,332 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/22 using time-division multiplexing
• CPC Class Codes: H04W 16/02 Resource partitioning among network components, e.g. reuse partitioning
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 92/20 between access points

Abstract

In order to avoid interference efficiently and control the amount of radio resources that are not used for interference avoidance, the present invention provides a radio base station connected to a neighbor radio base station via inter-radio base station interface. The radio base station has: a radio communication section that performs radio communication with a user terminal using a UL/DL configuration indicating a configuration of uplink and downlink subframes in a radio frame; an interference detecting section that measures and detects interference that the radio base station suffers from; and a selecting section that uses an interference detection result as a basis to determine which to apply to each subframe, between a resource allocation-unrestricted scheme and an inter-cell uplink/downlink orthogonalization scheme.

Claims

1. A radio base station connected to a neighbor radio base station via inter-radio base station interface, the radio base station comprising:

a radio communication section that performs radio communication with a user terminal using a UL/DL configuration indicating a configuration of uplink and downlink subframes in a radio frame;

an interference detecting section that measures and detects interference that the radio base station suffers from; and

a selecting section that uses an interference detection result as a basis to determine whether or not to apply a resource allocation-restricted inter-cell uplink/downlink orthogonalization scheme to each subframe.

2. The radio base station according to claim 1, wherein the selecting section selects a resource allocation-unrestricted scheme for each fixed subframe in the UL/DL configuration and selects either the resource allocation-unrestricted scheme or the inter-cell uplink/downlink orthogonalization scheme for each flexible subframe in the UL/DL configuration.

3. The radio base station according to claim 1, wherein the interference detecting section measures the interference by measuring Reference Signal Received Power (RSRP) of the neighbor radio base station.

4. The radio base station according to claim 1, wherein the interference detecting section measures all the interference that the radio base station suffers from by measuring interference in a fixed subframe and measuring interference in a flexible subframe.

5. The radio base station according to claim 1, wherein the interference detecting section measures the interference by assuming the inter-cell uplink/downlink orthogonalization scheme is applied in the neighbor radio base station.

6. The radio base station according to claim 1, further comprising an interference section that transmits a communication scheme to apply to each subframe to the neighbor radio base station via the inter-radio base station interface.

7. The radio base station according to claim 1, further comprising an interference section that transmits a request to apply the inter-cell uplink/downlink orthogonalization scheme based on a communication scheme to apply to each subframe to the neighbor radio base station via the inter-radio base station interface.

8. The radio base station according to claim 1, further comprising an interference section that transmits muting resource pattern information to the neighbor radio base station via the inter-radio base station interface.

9. A radio communication system in which a radio base station is connected to a neighbor radio base station via inter-radio base station interface,

the radio base station comprising:

a radio communication section that performs radio communication with a user terminal using a UL/DL configuration indicating a configuration of uplink and downlink subframes in a radio frame;

an interference detecting section that measures and detects interference that the radio base station suffers from;

a selecting section that uses an interference detection result as a basis to determine which to apply to each subframe, between a resource allocation-unrestricted scheme and an inter-cell uplink/downlink orthogonalization scheme; and

an interference section that transmits a communication scheme to apply to each subframe to the neighbor radio base station via the inter-radio base station interface, and

the neighbor radio base station comprising;

an interface section that receives information about the communication scheme from the radio base station; and

an interference control section that uses the information about the communication scheme as a basis to perform interference control by applying either the resource allocation-unrestricted scheme or the inter-cell uplink/downlink orthogonalization scheme to each subframe.

10. A radio communication method for a radio base station that is connected to a neighbor radio base station via inter-radio base station interface, the radio communication method comprising the steps of:

performing radio communication with a user terminal using a UL/DL configuration indicating a configuration of uplink and downlink subframes in a radio frame;

measuring and detecting interference that the radio base station suffers from; and

using an interference detection result as a basis to determine which to apply to each subframe, between a resource allocation-unrestricted scheme and an inter-cell uplink/downlink orthogonalization scheme.