Mobile communication system, user terminal, processor, storage medium, and base station supporting proximity service communication

• US 10,484,160 B2
• Filed: 02/27/2015
• Issued: 11/19/2019
• Est. Priority Date: 08/28/2012
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Morita, Kugo
• Primary Examiner(s): Mattis, Jason E
• Assistant Examiner(s): Shao, Hong
• Application Number:
  US14/633,962
• Publication Number:
  US 20150172037A1
• Time in Patent Office: 1,726 Days
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 92/18 between terminal devices

Abstract

A mobile communication system, which supports D2D communication that is direct device-to-device communication that is performed by using a radio resource assigned from a network, comprises: a user terminal that transmits a D2D start request for starting the D2D communication to the network, wherein the D2D start request includes an application identifier indicating an application used by the user terminal in the D2D communication, and a terminal identifier indicating another user terminal that is a communication partner of the user terminal in the D2D communication.

Claims

1. A mobile communication system comprising:

a user terminal; and

a base station, wherein

the user terminal is configured to transmit, to the base station, first information for the base station to recognize traffic characteristics related to assignment of periodic radio resources in a Proximity Service communication, wherein the Proximity Service communication does not pass through a network and is performed between terminals,

the user terminal is configured to monitor a PDCCH that has an RNTI allocated for the Proximity Service communication,

the user terminal is configured to receive radio resource information indicating the periodic radio resources related to the first information and assigned for the Proximity Service communication, from the base station, the radio resource information being received by monitoring the PDCCH having the RNTI,

the user terminal is further configured to transmit, to the base station, second information indicating a destination in the Proximity Service communication,

the user terminal is configured to perform HARQ retransmissions based on the periodic radio resources when transmitting data in the Proximity Service communication,

the user terminal is configured to receive a first radio signal from another user terminal via the Proximity Service communication, the first radio signal including first data and information indicating a transmission power of the first radio signal,

the user terminal is configured to measure a received power of the first radio signal, and

the user terminal is configured to determine a transmission power of a second radio signal to be transmitted from the user terminal to the another user terminal via the Proximity Service communication, on the basis of the measured received power of the first radio signal and the transmission power of the first radio signal indicated by the information.

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

the user terminal is configured to transmit the first information to recognize the traffic characteristics to the base station in order for the base station to perform quasi-static radio resource assignment, and

the user terminal is configured to receive the radio resource information indicating the periodic radio resources assigned by the base station performing the quasi-static radio resource assignment.

2. A user terminal, comprising:

a receiver;

a controller; and

a transmitter, wherein

the transmitter is configured to transmit, to a base station, first information for the base station to recognize traffic characteristics related to assignment of periodic radio resources in a Proximity Service communication, wherein the Proximity Service communication does not pass through a network and is performed between terminals,

the receiver is configured to monitor a PDCCH that has an RNTI allocated for the Proximity Service communication,

the receiver is configured to receive, from the base station, radio resource information, which indicates the periodic radio resources related to the first information and assigned for the Proximity Service communication, to the user terminal, the radio resource information being received by monitoring the PDCCH having the RNTI,

the transmitter is configured to transmit, to the base station, second information indicating a destination in the Proximity Service communication,

the transmitter is configured to perform HARQ retransmissions based on the periodic radio resources when transmitting data in the Proximity Service communication,

the receiver is configured to receive a first radio signal from another user terminal via the Proximity Service communication, the first radio signal including first data and information indicating a transmission power of the first radio signal,

the controller is configured to measure a received power of the first radio signal, and

the controller is configured to determine a transmission power of a second radio signal to be transmitted from the user terminal to the another user terminal via the Proximity Service communication, on the basis of the measured received power of the first radio signal and the transmission power of the first radio signal indicated by the information.

3. A processor for controlling a user terminal, wherein

the processor executes processes of:

transmitting, to a base station, first information for the base station to recognize traffic characteristics related to assignment of periodic radio resources in a Proximity Service communication, wherein the Proximity Service communication does not pass through a network and is performed between terminals;

monitoring a PDCCH that has an RNTI allocated for the Proximity Service communication;

receiving, from the base station, radio resource information, which indicates the periodic radio resources related to the first information and assigned for the Proximity Service communication, to the user terminal, the radio resource information being received by monitoring the PDCCH having the RNTI;

transmitting, to the base station, second information indicating a destination in the Proximity Service communication;

performing HARQ retransmissions based on the periodic radio resources when transmitting data in the Proximity Service communication;

receiving a first radio signal from another user terminal via the Proximity Service communication, the first radio signal including first data and information indicating a transmission power of the first radio signal;

measuring a received power of the first radio signal; and

determining a transmission power of a second radio signal to be transmitted from the user terminal to the another user terminal via the Proximity Service communication, on the basis of the measured received power of the first radio signal and the transmission power of the first radio signal indicated by the information.