BASE STATION, MOBILE STATION, COMMUNICATION CONTROL SYSTEM, AND COMMUNICATION CONTROL METHOD

• US 20130294414A1
• Filed: 09/09/2011
• Published: 11/07/2013
• Est. Priority Date: 01/27/2011
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Inumaru, Tadayoshi
• Granted Patent: US 9,237,559 B2
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0042 intra-user or intra-terminal allocation
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 36/0058 Transmission of hand-off measurement information, e.g. measurement reports
• CPC Class Codes: H04W 36/0069 in case of dual connectivity, e.g. decoupled uplink/downlink
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

In order to improve the use efficiency of radio resources upon executing a CA function, a base station (10A) forming a communication control system simultaneously transmits and receives a main carrier (100) and a plurality of sub-carriers (101 and 102) to wirelessly communicate with a mobile station (20). Prior to this, the base station (10A) notifies, to the mobile station (20) through the main carrier (100), first control information (201) for communication using the first sub-carrier (101), and first difference information (401) on a difference between the first control information (201) and second control information (202) for communication using another sub-carrier (102). The mobile station (20) reproduces the second control information (202) by using the first control information (201) and the first difference information (401).

Claims

1. A base station comprising:

a first radio communicator that simultaneously transmits and receives a main carrier and at least a part of a plurality of sub-carriers to wirelessly communicate with a mobile station; and

a controller that controls the first radio communicator,

wherein the controller is configured to cause the first communicator to notify, to the mobile station through the main carrier, first control information for communication using a first sub-carrier, and first difference information on a difference between the first control information and second control information for communication using each of other sub-carriers.

2. The base station according to claim 1, wherein the controller is configured to cause, in a case of starting to simultaneously transmit and receive the plurality of sub-carriers, the first communicator to multiplex the first control information and the first difference information to be notified to the mobile station.

3. The base station according to claim 1, further comprising:

a second communicator that is controlled by the controller, and that communicates with a different base station placed adjacent to the base station itself,

wherein the controller is configured to;

acquire, in a case of handing over the mobile station to the different base station and of causing the different base station to continuously use one sub-carrier used by the base station itself, second difference information on a difference between the first control information and third control information through the second communicator, the third control information being set by the different base station for communication using the one sub-carrier; and

cause the first communicator to notify the second difference information to the mobile station through the main carrier.

4. The base station according to claim 3, wherein the controller is configured to:

acquire, when a sub-carrier is newly added by the different base station upon the handover, third difference information on a difference between the third control information and fourth control information through the second communicator, the fourth control information being set by the different base station for communication using the added sub-carrier; and

cause the first communicator to notify the third difference information to the mobile station through the main carrier.

5. The base station according to claim 1, further comprising:

a second communicator that is controlled by the controller, and that communicates with a different base station placed adjacent to the base station itself,

wherein the controller is configured to;

cause, when the mobile station is located in an area where the mobile station can communicate with both of the base station itself and the different base station, the first communicator to transmit and receive a part of the plurality of sub-carriers to and from the mobile station; and

instruct, through the second communicator, the different base station to transmit and receive remaining sub-carriers to and from the mobile station.

6. The base station according to claim 5, wherein the controller is configured to select, in accordance with a type of data to be relayed between the mobile station and a switching center, carriers used for the relay from among the main carrier and the plurality of sub-carriers.

7. The base station according to claim 6, wherein when the remaining sub-carriers are selected, the controller is configured to cause the second communicator to:

transfer, to the different base station, data to be transmitted to the mobile station through the remaining sub-carriers; and

acquire data received by the different base station from the mobile station through the remaining sub-carriers.

8. A mobile station comprising:

a communicator that simultaneously transmits and receives a main carrier and a plurality of sub-carriers to wirelessly communicate with one or more base stations; and

a controller that controls the communicator,

wherein the controller is configured to;

receive, from one base station through the main carrier, first control information for communication using a first sub-carrier, and first difference information on a difference between the first control information and second control information for communication using each of other sub-carriers; and

reproduce the second control information by using the first control information and the first difference information.

9. The mobile station according to claim 8,

wherein the communicator is configured to receive, when the mobile station is handed over to a different base station placed adjacent to the one base station and when the different base station continuously use one sub-carrier used by the one base station, second difference information on a difference between the first control information and third control information from the one base station through the main carrier, the third control information being set by the different base station for communication using the one sub-carrier, and

wherein the controller is configured to reproduce the third control information by using the first control information and the second difference information.

10. A communication control system comprising:

a first base station; and

a mobile station that simultaneously transmits and receives a main carrier and a plurality of sub-carriers to wirelessly communicate with at least the first base station,

wherein the first base station notifies, to the mobile station through the main carrier, first control information for communication using a first sub-carrier, and first difference information on a difference between the first control information and second control information for communication using each of other sub-carriers, and

wherein the mobile station reproduces the second control information by using the first control information and the first difference information.