COMMUNICATION SYSTEM, COMMUNICATION CONTROL METHOD, MOBILE TERMINAL AND RELAY DEVICE

• US 20160044741A1
• Filed: 10/19/2015
• Published: 02/11/2016
• Est. Priority Date: 07/23/2009
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: TAKANO, Hiroaki
• Granted Patent: US 10,200,174 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04B 7/15557 Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode
• CPC Class Codes: H04L 12/12 Arrangements for remote connection or disconnection of substations or of equipment thereof
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04W 40/22 using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
• CPC Class Codes: H04W 52/0206 in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 64/003 locating network equipment
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 84/047 using dedicated repeater stations
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A communication system is configured that includes a mobile terminal, one or more relay devices, and a base station for communicating with the mobile terminal via any of the one or more relay devices, where the mobile terminal includes a reception unit for receiving a reference signal transmitted from the one or more relay devices, a determination unit for determining a relay device to be used for communication with the base station based on the reference signal received by the reception unit from the one or more relay devices, and a transmission unit for transmitting to the base station information indicating the relay device determined by the determination unit.

Claims

1. (canceled)

2. A mobile terminal comprising:

a receiver configured to receive at least one of a first reference signal or a second reference signal transmitted from one or more communication devices, wherein

each of the one or more communication devices transmits the first reference signal according to a first cycle on a first downlink transmission operated as a power save state and transmits the second reference signal according to a second cycle on a second downlink transmission operated as an active state, the first cycle being longer than the second cycle.

3. The mobile terminal of claim 2, further comprising:

a transmitter configured to transmit, to a base station, reception intensity information corresponding to each signal transmitted from a plurality of base stations.

4. The mobile terminal of claim 2, further comprising:

a transmitter configured to transmit, to a base station, reception intensity information corresponding to each signal transmitted from the base station and the one or more communication devices.

5. The mobile device of claim 2, further comprising:

a transmitter configured to transmit, to a base station, location information corresponding to the mobile device estimated by GPS.

6. The communication device of claim 3, wherein the communication interface is configured to:

perform discontinuous reception in a case that the communication device is operating in the power save mode; and

receive an indication from the base station while performing the discontinuous reception.

7. The mobile terminal of claim 2, wherein the first cycle is a discontinuous transmission (DTX) cycle.

8. The mobile terminal of claim 2, wherein the first cycle is longer than a length of a sub-frame.

9. The mobile terminal of claim 2, wherein the first cycle is longer than a length of 10 sub-frames.

10. A communication device, comprising:

a communication interface configured to communicate with at least one of a base station and a mobile terminal; and

circuitry configured to

control transmitting a first reference signal according to a first cycle or a second reference signal according to a second cycle, the first cycle being longer than the second cycle, wherein the first reference signal is transmitted on a first downlink transmission operated as the power save state and the second reference signal is transmitted on a second downlink transmission operated as the active state.

11. The communication device of claim 10, wherein the first cycle is a discontinuous transmission (DTX) cycle.

12. The communication device of claim 10, wherein the first cycle is longer than a length of a sub-frame.

13. The communication device of claim 10, wherein the first cycle is longer than a length of 10 sub-frames.

14. The communication device of claim 10, wherein the first reference signal is used for synchronization.