COMMUNICATION CONTROL METHOD, BASE STATION, AND USER TERMINAL

• US 20160255637A1
• Filed: 10/23/2014
• Published: 09/01/2016
• Est. Priority Date: 10/29/2013
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: FUJISHIRO, Masato, YAMAZAKI, Chiharu
• Granted Patent: US 10,070,446 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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:

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.

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

in the coordinated transmission step, 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

in the coordinated transmission step, 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 the steps of:

transmitting information indicating the use-restricted subframe from a first base station that manages the first cell to a second base station that manages the second cell; and

transmitting coordinated transmission information for performing the coordinated transmission from the second base station to the first base station, wherein

in the coordinated transmission step, the first base station that receives the coordinated transmission information performs the coordinated transmission on the basis of the coordinated transmission information.

5. The communication control method according to claim 4, wherein

the coordinated transmission information is information for requesting to perform the coordinated transmission.

6. The communication control method according to claim 4, further comprising the step of:

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.

7. The communication control method according to claim 6, 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.

8. The communication control method according to claim 4, wherein

the coordinated transmission information includes data scheduled to be transmitted, in the use-restricted subframe, from the second cell to the user terminal.

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

the coordinated transmission is JT (Joint Transmission) in which the same data is transmitted, by the same time-frequency resource and the same transport format, from the first cell and the second cell.

10. A 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 control the first cell so as to perform, in the use-restricted subframe, a coordinated transmission with the second cell, to a user terminal connected to the second cell.

11. A user terminal connected to a second cell in a mobile communication system in which in order to suppress an interference from a first cell to the second cell, a use-restricted subframe is set in the first cell, the user terminal comprising:

a receiver configured to receive, in the use-restricted subframe, data transmitted, by a coordinated transmission, from the first cell and the second cell.