User terminal and base station that support D2D proximity services

• US 10,085,242 B2
• Filed: 07/28/2016
• Issued: 09/25/2018
• Est. Priority Date: 08/08/2014
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Fujishiro, Masato, Adachi, Hiroyuki, Yamazaki, Chiharu, Nagasaka, Yushi, Chang, Henry
• Primary Examiner(s): Kading, Joshua
• Application Number:
  US15/222,713
• Publication Number:
  US 20170041773A1
• Time in Patent Office: 789 Days
• CPC Class Codes: H04W 40/24 Connectivity information management, e.g. connectivity discovery or connectivity update
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/121 for groups of terminals or users
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

A user terminal according to an embodiment comprises: a transmitter configured to transmit a message to a base station, the message requesting a gap used to receive or transmit a discovery signal that is a direct terminal-to-terminal radio signal for discovering another user terminal; and a receiver configured to receive configuration information from the base station, the configuration information configuring the gap to the user terminal. The message includes: gap information indicating the gap; and frequency information indicating a frequency associated with the gap information. The gap information includes: a bitmap indicating at least one subframe; and an offset value with reference to “0” of system frame number (SFN).

Claims

1. A user terminal, comprising:

a controller configured to;

determine a plurality of frequencies on which the user terminal requires reception or transmission of a discovery signal that is a direct device-to-device radio signal for discovering another user terminal to produce a plurality of determined frequencies; and

determine subframes on which the user terminal needs sidelink gaps to be used to receive or transmit the discovery signal for each frequency of the plurality of determined frequencies;

a transmitter configured to transmit a message to a base station, the message including a plurality of information corresponding to the plurality of determined frequencies, wherein each of the plurality of information includes;

frequency information indicating a respective determined frequency of the plurality of determined frequencies; and

a bitmap indicating the determined subframes associated with the respective determined frequency, wherein the frequency information is associated with the bitmap; and

a receiver configured to receive configuration information from the base station, the configuration information indicating assigned sidelink gaps provided by the base station, wherein the assigned sidelink gaps are based on the message transmitted by the user terminal,

wherein the transmitter or the receiver uses the assigned sidelink gaps to transmit or receive the discovery signal.

2. An apparatus for a user terminal comprising:

a processor and a memory, the processor configured to cause the user terminal to;

determine a plurality of frequencies on which the user terminal requires reception or transmission of a discovery signal that is a direct device-to-device radio signal for discovering another user terminal to produce a plurality of determined frequencies;

determine subframes on which the user terminal needs sidelink gaps to be used to receive or transmit the discovery signal for each frequency of the plurality of determined frequencies;

transmit a message to a base station, the message including a plurality of information corresponding to the plurality of determined frequencies, wherein each of the plurality of information includes;

frequency information indicating a respective determined frequency of the plurality of determined frequencies; and

a bitmap indicating the determined subframes associated with the respective determined frequency, wherein the frequency information is associated with the bitmap;

receive configuration information from the base station, the configuration information indicating assigned sidelink gaps provided by the base station, wherein the assigned sidelink gaps are based on the message transmitted by the user terminal; and

use the assigned sidelink gaps to transmit or receive the discovery signal.

3. A base station comprising:

a receiver configured to receive a message from a user terminal, the message including a plurality of information corresponding to a plurality of frequencies,

wherein the plurality of information includes frequency information and a bitmap associated with the frequency information, wherein the frequency information indicates a respective frequency of the plurality of frequencies on which the user terminal requires reception or transmission of a discovery signal that is a direct device-to-device radio signal for discovering another user terminal, and the bitmap indicates subframes determined by the user terminal and on which the user terminal needs sidelink gaps to be used to receive or transmit the discovery signal, wherein the subframes are determined for each frequency by the user terminal and are associated with the respective frequency;

a controller configured to assign sidelink gaps to the user terminal based on the message transmitted by the user terminal, and

a transmitter configured to transmit configuration information to the user terminal, the configuration information indicating the assigned sidelink gaps to be used by the user terminal to transmit or receive the discovery signal.

4. An apparatus for a base station comprising:

a processor and a memory, the processor configured to cause the base station to

receive a message from a user terminal, the message including a plurality of information corresponding to a plurality of frequencies, wherein each of the plurality of information includes frequency information and a bitmap associated with the frequency information, wherein the frequency information indicates a respective frequency of the plurality of frequencies on which the user terminal requires reception or transmission of a discovery signal that is a direct device-to-device radio signal for discovering another user terminal, and the bitmap indicates subframes determined by the user terminal and on which the user terminal needs sidelink gaps to be used to receive or transmit the discovery signal, wherein the subframes are determined for each frequency by the user terminal and are associated with the respective frequency;

assign sidelink gaps to the user terminal based on the message transmitted by the user terminal; and

transmit configuration information to the user terminal, the configuration information indicating the assigned sidelink gaps to be used by the user terminal to transmit or receive the discovery signal.