Method of transmitting a scheduling assignment signal for device-to-device communication in a wireless communication system, and an apparatus thereof

Patent metadata

Field	Value
Publication number	US-9730174-B2
Application number	US-201514634320-A
Country	US
Kind code	B2
Filing date	Feb 27, 2015
Priority date	Feb 27, 2014
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

Disclosed are a method for transmitting a signal for device-to-device (D2D) communication of a user equipment in a wireless communication system and an apparatus for the same. Specifically, the method includes transmitting a D2D signal assigned at least one of a first synchronization information, a second synchronization information and a scheduling assignment information in a scheduling assignment resource unit. The first synchronization information and the second synchronization information are configured to be transmitted with different periodicities.

First claim

What is claimed is:

1. A method for transmitting a signal for device-to-device (D2D) communication of a user equipment in a wireless communication system, the method comprising:
configuring, by the user equipment, a D2D resource pool into a plurality of resource blocks for the D2D communication,
wherein the plurality of resource blocks are configured to carry at least one of a D2D synchronization signal (D2DSS) or a Physical D2D synchronization channel (PD2DSCH); and
transmitting, by the user equipment, a mapped scheduling assignment on a specific resource block carrying the PD2DSCH among the plurality of resource blocks,
wherein a unit of the mapped scheduling assignment is configured to have a number of symbols according to channel estimation performance,
wherein the specific resource block is configured to include demodulation reference signals in association with the mapped scheduling assignment, and
wherein each of the demodulation reference signals is allocated to a different resource element based on a different resource element offset according to symbols of a corresponding demodulation reference signal.

2. The method according to claim 1 , wherein a sequence of the demodulation reference signals is generated based on an identity of the user equipment.

3. The method according to claim 1 , wherein a subframe number, to which the scheduling assignment is allocated, is indicated through higher layer signaling.

4. A user equipment (UE) for device-to-device (D2D) communication in a wireless communication system, the UE comprising:
a radio frequency unit; and
a processor,
wherein the processor is configured to:
configure a D2D resource pool into a plurality of resource blocks for the D2D communication, wherein the plurality of resource blocks are configured to carry at least one of a D2D synchronization signal (D2DSS) or a Physical D2D synchronization channel (PD2DSCH) and
transmit a mapped scheduling assignment on a specific resource block carrying the PD2DSCH among the plurality of resource blocks,
wherein a unit of the mapped scheduling assignment is configured to have a number of symbols according to channel estimation performance,
wherein the specific resource block is configured to include demodulation reference signals in association with the mapped scheduling assignment, and
wherein each of the demodulation reference signals is allocated to a different resource element based on a different resource element offset according to symbols of a corresponding demodulation reference signal.

5. The UE according to claim 4 , wherein a sequence of the demodulation reference signals is generated based on an identity of the user equipment.

6. The UE according to claim 4 , wherein a subframe number, to which the scheduling assignment is allocated, is indicated through higher layer signaling.

Assignees

• Lg Electronics Inc

Inventors

• Seo Daewon
• Seo Hanbyul
• Kim Myoungseob

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W56/002 Primary

  Mutual synchronization · CPC title

• H04W76/023

  Electricity · mapped topic

• H04L5/0032

  Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title