Communication control method, base station, and user terminal

• US 10,070,446 B2
• Filed: 10/23/2014
• Issued: 09/04/2018
• Est. Priority Date: 10/29/2013
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Fujishiro, Masato, Yamazaki, Chiharu
• Primary Examiner(s): Elallam, Ahmed
• Application Number:
  US15/031,146
• Publication Number:
  US 20160255637A1
• Time in Patent Office: 1,412 Days
• CPC Class Codes: H04L 5/0005 Time-frequency
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 16/32 Hierarchical cell structures
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A communication control method used in a mobile communication system in which in order to suppress an interference from a first cell to a second cell, a use-restricted subframe is set in the first cell comprises a coordinated transmission step of performing, in the use-restricted subframe, a coordinated transmission from the first cell and the second cell to a user terminal connected to the second cell.

Claims

1. A communication control method used in a mobile communication system in which in order to suppress an interference from a first cell to a second cell, a use-restricted subframe is set in the first cell, the method comprising:

transmitting, by a second base station that manages the second cell, to a first base station that manages the first cell, coordinated transmission information for requesting to perform a coordinated transmission from the first cell and the second cell to a user terminal connected to the second cell, the coordinated transmission information including data scheduled to be transmitted from the second cell to the user terminal through the coordinated transmission; and

performing, in the use-restricted subframe, the coordinated transmission of the data, from the first cell and the second cell to a user terminal connected to the second cell.

2. The communication control method according to claim 1, wherein

the first cell uses at least a part of a PDSCH (Physical Downlink Shared Channel) resource of the use-restricted subframe to perform the coordinated transmission, without using a PDCCH (Physical Downlink Control Channel) resource of the use-restricted subframe.

3. The communication control method according to claim 2, wherein

the first cell performs, in the use-restricted subframe, the coordinated transmission while avoiding a use of the PDSCH resource corresponding to a CRS (Cell specific Reference Signal) resource of the second cell.

4. The communication control method according to claim 1, further comprising:

transmitting information indicating the use-restricted subframe from the first base station to the second base station.

5. The communication control method according to claim 4, further comprising:

performing beforehand, by the second base station, scheduling of the user terminal for the use-restricted subframe, wherein

the coordinated transmission information includes scheduling information obtained by the scheduling.

6. The communication control method according to claim 5, wherein

the scheduling information is at least one of:

a resource block assigned, in the use-restricted subframe, to the user terminal; and

a transport format applied, in the use-restricted subframe, to the user terminal.

7. The communication control method according to claim 1, further comprising:

determining, by the first base station, based on the coordinated transmission information, whether to perform the coordinated transmission of the data, wherein

the coordinated transmission of the data is performed upon the first base station determining to perform the coordinated transmission of the data.

8. A first base station that manages at least a first cell in a mobile communication system in which in order to suppress an interference from the first cell to a second cell, a use-restricted subframe is set in the first cell, the base station comprising:

a controller configured to;

receive from a second base station that manages the second cell, coordinated transmission information for requesting to perform a coordinated transmission from the first cell and the second cell to a user terminal connected to the second cell, the coordinated transmission information including data scheduled to be transmitted from the second cell to the user terminal through the coordinated transmission; and

control the first cell so as to perform, in the use-restricted subframe, the coordinated transmission of the data, to the user terminal.