Communication control method, user terminal, and base station

Patent metadata

Field	Value
Publication number	US-2016007372-A1
Application number	US-201414767217-A
Country	US
Kind code	A1
Filing date	Feb 18, 2014
Priority date	Feb 19, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

A communication control method is used in a mobile communication system that supports D2D communication that is direct device-to-device communication in which a data path does not pass through a core network. The communication control method comprises: a step A of transmitting, by a first user terminal camping on a first cell, a radio signal that includes a serving cell identifier for identifying the first cell; a step B of transmitting, by a second user terminal camping on a second cell, the serving cell identifier included in the radio signal from the second user terminal to the second cell when the radio signal is received from the first user terminal; and a step C of sharing, by the first cell and the second cell, scheduling information for controlling the D2D communication performed by the first user terminal and the second user terminal, on the basis of the serving cell identifier received by the second cell from the second user terminal.

First claim

1 . A communication control method that is used in a mobile communication system that supports D2D communication that is direct device-to-device communication in which a data path does not pass through a core network, comprising:
a step A of transmitting, by a first user terminal camping on a first cell, a radio signal that includes a serving cell identifier for identifying the first cell; a step B of transmitting, by a second user terminal camping on a second cell, the serving cell identifier included in the radio signal from the second user terminal to the second cell when the radio signal is received from the first user terminal; and a step C of sharing, by the first cell and the second cell, scheduling information for controlling the D2D communication performed by the first user terminal and the second user terminal, on the basis of the serving cell identifier received by the second cell from the second user terminal.

2 . The communication control method according to claim 1 , wherein
The radio signal is a discovery-use signal for the discovery of a proximal terminal that can be a communication partner of the D2D communication.

3 . The communication control method according to claim 1 , wherein
the scheduling information includes information on a radio resource that is assigned for the D2D communication that is performed by the first user terminal and the second user terminal.

4 . The communication control method according to claim 1 , wherein
in the first cell and/or the second cell, the scheduling information includes information on a radio resource assigned for the D2D communication.

5 . The communication control method according to claim 4 , wherein
the radio resource assigned for the D2D communication is a radio resource capable of being used for receiving a D2D communication signal in the D2D communication.

6 . The communication control method according to claim 4 , wherein
the radio resource assigned for the D2D communication is a radio resource capable of being used for transmitting a D2D communication signal in the D2D communication.

7 . The communication control method according to claim 6 , wherein
in the first cell and/or the second cell, the radio resource capable of being used for transmitting the D2D communication signal is within a range of a radio resource capable of being used for receiving the D2D communication signal.

8 . The communication control method according to claim 4 , wherein
the radio resource assigned for the D2D communication is a radio resource capable of being used for exchanging a control signal including information indicating a radio resource used for exchanging user data in the D2D communication.

9 . The communication control method according to claim 1 , further comprising:
a step D of controlling, by the first cell and the second cell in cooperation with each other, the D2D communication performed by the first user terminal and the second user terminal, on the basis of the shared scheduling information.

10 . The communication control method according to claim 9 , wherein
one user terminal of the first user terminal and the second user terminal is an anchor terminal which is able to control the other user terminal in the D2D communication, and in the step D, the first cell or the second cell transmits control information of the D2D communication to the one user terminal serving as the anchor terminal.

11 . The communication control method according to claim 10 , wherein
the step D comprises: a step of inquiring, by the one user terminal serving as the anchor terminal, of a serving cell of the one user terminal between the first cell and the second cell about whether the scheduling information decided by the one user terminal is applicable; and a step of sharing, by the first cell and the second cell, the scheduling information on the basis of the inquiry from the one user terminal serving as the anchor terminal.

12 . The communication control method according to claim 1 , wherein
the first cell is managed by a first base station and the second cell is managed by a second base station, and in the step C, one of the first base station and the second base station transmits the scheduling information to the other base station to thereby share the scheduling information between the first cell and the second cell.

13 . A user terminal, which camps on a first cell in a mobile communication system that supports D2D communication that is direct device-to-device communication in which a data path does not pass through a core network, comprising:
a transmission unit that transmits a discovery-use signal that is a signal for discovering a proximal terminal to be a communication partner of the D2D communication and includes a serving cell identifier for identifying the first cell.

14 . A user terminal, which camps on a second cell in a mobile communication system that supports D2D communication that is direct device-to-device communication in which a data path does not pass through a core network, comprising:
a reception unit that receives, from another user terminal camping on a first cell, a discovery-use signal that is a signal for discovering a proximal terminal that can be a communication partner of the D2D communication and includes a serving cell identifier for identifying the first cell; and a transmission unit that transmits, to the second cell, the serving cell identifier included in the discovery-use signal received by the reception unit.

15 . Abase station, which manages a second cell in a mobile communication system that supports D2D communication that is direct device-to-device communication in which a data path does not pass through a core network, comprising:
a reception unit that receives a serving cell identifier for identifying a first cell on which a first user terminal camps, from a second user terminal camping on the second cell; and a control unit that shares scheduling information for controlling the D2D communication performed by the first user terminal and the second user terminal, with another base station that manages the first cell, on the basis of the serving cell identifier received by the reception unit.

16 . The base station according to claim 15 , wherein
in the first cell and/or the second cell, the scheduling information includes information on a radio resource assigned for the D2D communication.

17 . The base station according to claim 16 , wherein
the radio resource is a radio resource capable of being used for receiving a D2D communication signal in the D2D communication.

18 . The base station according to claim 16 , wherein
the radio resource is a radio resource capable of being used for transmitting a D2D communication signal in the D2D communication.

19 . The base station according to claim 18 , wherein
in the first cell and/or the second cell, the radio resource capable of being used for transmitting the D2D communication signal is within a range of a radio resource capable of being used for receiving the D2D communication signal.

20 . The base station according to claim 16 , wherein
the radio resource assigned for the D2D communication is a radio resource capable of being used for exchanging a control signal including information indicating a radio resource used for exchanging user data in the D2D communication.

Assignees

• Kyocera Corp

Inventors

• Fujishiro Masato
• Morita Kugo
• Yamazaki Chiharu

Classifications

• H04W8/005 Primary

  Discovery of network devices, e.g. terminals · CPC title

• H04W72/20 Primary

  Control channels or signalling for resource management · CPC title

• H04W88/08

  Access point devices · CPC title

• H04W88/02

  Terminal devices · CPC title

• H04W72/1278 Primary

  Electricity · mapped topic