WIRELESS COMMUNICATION SYSTEM, BASE STATION DEVICE, AND WIRELESS COMMUNICATION ROUTE SELECTION METHOD

• US 20130329646A1
• Filed: 02/24/2012
• Published: 12/12/2013
• Est. Priority Date: 02/25/2011
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Fukumoto, Shusaku, Sugahara, Shiro, Takehana, Shuichi, Fukumasa, Hidenobu
• Granted Patent: US 9,137,732 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04B 7/15507 Relay station based processing for cell extension or control of coverage area, network planning with network coordinated processing with regard to cell extension H04W16/26; network topologies using dedicated repeater stations H04W84/047; terminal devices adapted for relaying to or from an other terminal H04W88/04
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04W 40/12 based on transmission quality or channel quality
• CPC Class Codes: H04W 40/24 Connectivity information management, e.g. connectivity discovery or connectivity update
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A base station device includes: an information collection unit configured to collect information for calculating evaluation values for each of first, second, and third transmission paths; an evaluation value calculation unit configured to calculate the evaluation values for each of the first, second, and third transmission paths, based on the collected information; and a transmission path selection unit configured to select, using the evaluation values of each of the first, second, and third transmission paths, a transmission path to be used by a mobile communication terminal.

Claims

1. A wireless communication system comprising a base station device, a mobile communication terminal, and a relay station device relaying data transmission between the base station device and the mobile communication terminal, wherein, of

a first transmission path performing wireless communication between the base station device and the mobile communication terminal using a first carrier that is a component carrier,

a second transmission path performing wireless communication between the base station device and the mobile communication terminal using a second carrier that is a component carrier having a frequency different from that of the first carrier, and

a third transmission path that, by performing wireless communication between the base station device and the relay station device using the first carrier and also by performing wireless communication between the relay station device and the mobile communication terminal using the third carrier, performs wireless communication, going through the relay station device, between the base station device and the mobile communication terminal,

at least two of the first, second and third transmission paths can be used,

and wherein the base station device comprises:

an information collection unit configured to collect information for calculating evaluation values for each of the first, second, and third transmission paths;

an evaluation value calculation unit configured to calculate the evaluation values for each of the first, second, and third transmission paths, based on the collected information; and

a transmission path selection unit configured to select, using the evaluation values of each of the first, second, and third transmission paths, a transmission path to be used by the mobile communication terminal.

2. The mobile communication system according to claim 1, wherein

the base station device, to collect the information, requests the relay station device to transmit a reference signal using a component carrier that will be a candidate for carrier aggregation, and requests the mobile communication terminal that will perform carrier aggregation to measure the reference signal transmitted by the base station device and a plurality of neighboring relay station devices, and wherein

the mobile communication terminal reports to the base station device information of measurement results measured in response to the reference signal measurement request.

3. The mobile communication system according to claim 1, wherein

the base station device, to collect the information, requests the mobile communication terminal to use a component carrier that will be a candidate for carrier aggregation to transmit a reference signal and requests the relay station device that will perform carrier aggregation to measure the reference signal transmitted by the neighboring mobile communication terminal, and wherein

the relay station device reports to the base station device information of measurement results measured in response to the reference signal measurement request.

4. A base station device performing wireless communication with a mobile communication terminal and a relay station device, wherein, of

a first transmission path performing wireless communication between the base station device and the mobile communication terminal using a first carrier that is a component carrier,

a second transmission path performing wireless communication between the base station device and the mobile communication terminal using a second carrier that is a component carrier having a frequency different from that of the first carrier, and

a third transmission path that, by performing wireless communication between the base station device and the relay station device using the first carrier and also by performing wireless communication between the relay station device and the mobile communication terminal using the third carrier, performs wireless communication, going through the relay station device, between the base station device and the mobile communication terminal,

at least two of the first, second and third transmission paths can be used,

the base station device comprising:

an information collection unit configured to collect information for calculating evaluation values for each of the first, second, and third transmission paths;

an evaluation value calculation unit configured to calculate the evaluation values for each of the first, second, and third transmission paths, based on the collected information; and

a transmission path selection unit configured to select, using the evaluation values of each of the first, second, and third transmission paths, a transmission path to be used by the mobile communication terminal.

5. A wireless communication route selection method in a wireless communication system comprising a base station device, a mobile communication terminal, and a relay station device relaying data transmission between the base station device and the mobile communication terminal, wherein, of

a first transmission path performing wireless communication between the base station device and the mobile communication terminal using a first carrier that is a component carrier,

a second transmission path performing wireless communication between the base station device and the mobile communication terminal using a second carrier that is a component carrier having a frequency different from that of the first carrier, and

a third transmission path that, by performing wireless communication between the base station device and the relay station device using the first carrier and also by performing wireless communication between the relay station device and the mobile communication terminal using the third carrier, performs wireless communication, going through the relay station device, between the base station device and the mobile communication terminal,

at least two of the first, second and third transmission paths can be used,

and wherein the base station device performs:

collecting information for calculating evaluation values for each of the first, second, and third transmission paths,

calculating the evaluation values for each of the first, second, and third transmission paths based on the collected information, and

using the evaluation values of each of the first, second, and third transmission paths to select a transmission path to be used by the mobile communication terminal.

6. The wireless communication route selection method according to the claim 5, wherein

the base station device, to collect the information, requests the relay station device to transmit a reference signal using a component carrier that will be a candidate for carrier aggregation, and requests the mobile communication terminal that will perform carrier aggregation to measure the reference signal transmitted by the base station device and a plurality of neighboring relay station devices, and wherein

the mobile communication terminal reports to the base station device information of measurement results measured in response to the reference signal measurement request.

7. The wireless communication route selection method according to claim 5, wherein

the base station device, to collect the information, requests the mobile communication terminal to use a component carrier that will be a candidate for carrier aggregation to transmit a reference signal and requests the relay station device that will perform carrier aggregation to measure the reference signal transmitted by the neighboring mobile communication terminal, and wherein

the relay station device reports to the base station device information of measurement results measured in response to the reference signal measurement request.