SYNCHRONIZATION SIGNALS FOR DEVICE-TO-DEVICE COMMUNCATIONS

• US 20160044618A1
• Filed: 08/05/2015
• Published: 02/11/2016
• Est. Priority Date: 08/06/2014
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: SHENG, Jia, YAMADA, Shohei, KOWALSKI, John Michael, YIN, Zhanping
• Granted Patent: US 9,860,860 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 56/0005 synchronizing of arrival of multiple uplinks
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 56/002 Mutual synchronization
• CPC Class Codes: H04W 76/14 Direct-mode setup

Abstract

A user equipment (UE) may comprise a detector which is configured to detect a first sidelink synchronization signal. The UE may comprise a receiver which is configured to receive a physical sidelink channel. The physical sidelink channel may carry information specifying whether or not a source of the first sidelink synchronization signal is in-coverage. The first sidelink synchronization signal may be generated by using at least a first identity.

Claims

1. A user equipment (UE) comprising:

a receiver configured to detect a first sidelink synchronization signal; and

a controller configured to acquire, from the physical sidelink channel, information specifying whether or not a source of the first sidelink synchronization signal is in-coverage;

wherein

the first sidelink synchronization signal is generated by using at least a first identity.

2. The user equipment (UE) of claim 1, wherein

the first sidelink synchronization signal is generated by further using a second identity,

a range of the first identity is [0, 1], and

a range of the second identity is [0-167].

3. The user equipment (UE) of claim 2, wherein

a value “

0”

of the first identity corresponds to in-coverage and

a value “

1”

of the first identity corresponds to out-of-coverage.

4. The user equipment (UE) of claim 1, wherein

a root index of a sequence for the first sidelink synchronization signal is determined by using at least the first identity.

5. The user equipment (UE) of claim 1, further comprising:

a generator configured to generate a second sidelink synchronization signal; and

a transmitter configured to transmit the physical sidelink channel which carries information specifying whether or not the UE is in coverage;

wherein

the second sidelink synchronization signal is generated by using at least the first identity.

6. A user equipment (UE) comprising:

a controller configured to generate a sidelink synchronization signal; and

a transmitter configured to transmit the physical sidelink channel which carries information specifying whether or not the UE is in coverage;

wherein

the sidelink synchronization signal is generated by using at least a first identity.

7. The user equipment (UE) of claim 6, wherein

the sidelink synchronization signal is generated by further using a second identity,

a range of the first identity is [0, 1], and

a range of the second identity is [0-167].

8. The user equipment (UE) of claim 7, wherein

a value “

0”

of the first identity corresponds to in-coverage, and

a value “

1”

of the first identity corresponds to out-of-coverage.

9. The user equipment (UE) of claim 6, wherein a root index of a sequence for the sidelink synchronization signal is determined by using at least the first identity.

10. A method in a user equipment (UE), the method comprising:

receiving a first sidelink synchronization signal; and

acquiring, from a physical sidelink channel, information specifying whether or not a source of the first sidelink synchronization signal is in-coverage;

wherein the first sidelink synchronization signal is generated by using at least a first identity.

11. The method of claim 10, the method further comprising:

generating a second sidelink synchronization; and

transmitting the physical sidelink channel which carries information specifying whether or not the UE is in coverage;

wherein

the second sidelink synchronization signal is generated by using at least the first identity.

12. A method in a user equipment (UE), the method comprising:

generating a sidelink synchronization signal; and

transmitting a physical sidelink channel which carries information specifying whether or not the UE is in coverage;

wherein

the sidelink synchronization signal is generated by using at least a first identity.