USER TERMINAL AND BASE STATION

• US 20170041773A1
• Filed: 07/28/2016
• Published: 02/09/2017
• 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
• Granted Patent: US 10,085,242 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 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, wherein

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).

2. The user terminal according to claim 1, wherein

the gap is a transmission gap used to transmit the discovery signal,

the transmitter is further configured to transmit the discovery signal during the transmission gap, and

the transmitter is further configured to prioritize transmission of an uplink signal over transmission of the discovery signal in response to occurring the uplink signal during the transmission gap.

3. The user terminal according to claim 2, wherein

the transmitter is further configured to prioritize transmission of a control signal to the base station as the uplink signal over transmission of the discovery signal during the transmission gap.

4. The user terminal according to claim 1, wherein

the gap is a reception gap used to receive the discovery signal,

the reception gap is a period during which the user terminal is not expected to receive a downlink signal, and

the receiver is further configured to receive the discovery signal during the reception gap.

5. The user terminal according to claim 1, wherein

the user terminal is further configured to prioritize a measurement over transmission or reception of the discovery signal.

6. The user terminal according to claim 1, wherein

the gap is a period during which the user terminal transmits or receives the discovery signal in an intra-frequency and an inter-frequency.

7. The user terminal according to claim 1, wherein

the gap includes a time during which the user terminal tunes a frequency.

8. The user terminal according to claim 1, wherein

the gap information includes a period for the bitmap.

9. The user terminal according to claim 1, wherein

the message includes

plural pieces of gap information as the gap information, and

plural pieces of information indicating frequencies associated with each piece of gap information, as the frequency information.

10. The user terminal according to claim 1, wherein

the configuration information includes first information and second information,

the first information configures a transmission gap to the user terminal, the transmission gap used to transmit the discovery signal, and

the second information configures a reception gap to the user terminal, the reception gap used to receive the discovery signal.

11. The user terminal according to claim 1, wherein

the receiver is further configured to receive information from the base station, the information used to release configuration of the gap.

12. An apparatus for a user terminal comprising:

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

receive configuration information from the base station, the configuration information configuring the gap to the user terminal, wherein

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 requested by the user terminal as the gap; and

an offset value with reference to “

0”

of system frame number (SFN).

13. A base station comprising:

a receiver configured to receive a message from a user terminal, 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 transmitter configured to transmit configuration information to the user terminal, the configuration information configuring the gap to the user terminal, wherein

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).

14. 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 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

transmit configuration information to the user terminal, the configuration information configuring the gap to the user terminal, wherein

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).