Method and apparatus for data transmission of device-to-device user equipment in wireless communication system

Patent metadata

Field	Value
Publication number	US-9735926-B2
Application number	US-201514835362-A
Country	US
Kind code	B2
Filing date	Aug 25, 2015
Priority date	Aug 26, 2014
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

According to an embodiment of the present invention, a method for transmitting Device-to-Device (D2D) data by a User Equipment (UE) in a wireless communication system, the method comprising: determining a bitmap to be applied to a subframe pool for data transmission from a subframe indicator bitmap; determining a set of subframes to transmit D2D data by using the bitmap to the subframe pool for data transmission; and transmitting D2D data in a subframe included in the determined subframe set, wherein a set of values available as k being the number of 1s in the subframe indicator bitmap are changed according to a change in a transmission mode under unchanged UL/DL configuration.

First claim

What is claimed is:

1. A method for transmitting Device-to-Device (D2D) data by a User Equipment (UE) in a wireless communication system, the method comprising:
determining a bitmap to be applied to a subframe pool for data transmission from one of a first subframe indicator bitmap for a transmission mode 1 UE which receives indication of transmission resources for D2D communications or a second subframe indicator bitmap for a transmission mode 2 UE which selects the transmission resources for the D2D communications,
wherein a maximum value of a first set of values available as k being the number of is in the first subframe indicator bitmap is larger than a maximum value of a second set of values available as k being the number of is in the second subframe indicator bitmap;
determining a set of subframes to transmit D2D data by using the bitmap to the subframe pool for data transmission; and
transmitting D2D data in a subframe included in the determined subframe set.

2. The method according to claim 1 , wherein a set of values available as k in transmission mode 2 of the UE is a subset of a set of values available as k in transmission mode 1 of the UE.

3. The method according to claim 1 , wherein if the transmission mode of the UE is transmission mode 2 and a UL/DL configuration configured for the UE is one of UL/DL configurations 1, 2, 4, and 5, the set of values available as k is {1, 2, 4}.

4. The method according to claim 1 , wherein if the transmission mode of the UE is transmission mode 2 and a UL/DL configuration configured for the UE is UL/DL configuration 0, the set of values available as k is {1, 2, 3, 4, 5}.

5. The method according to claim 1 , wherein if the transmission mode of the UE is transmission mode 2 and a UL/DL configuration configured for the UE is one of UL/DL configurations 3 and 6, the set of values available as k is {1, 2, 3, 4}.

6. The method according to claim 1 , wherein if the transmission mode of the UE is transmission mode 2 and a duplex mode of the UE is Frequency Division Duplex (FDD), the set of values available as k is {1, 2, 4}.

7. An apparatus of a User Equipment (UE) for transmitting a Device-to-Device (D2D) data in a wireless communication system, the apparatus comprising:
a transmission module; and
a processor, wherein the processor is configured to
determine a bitmap to be applied to a subframe pool for data transmission from one of a first subframe indicator bitmap for a transmission mode 1 UE which receives indication of transmission resources for D2D communications or a second subframe indicator bitmap for a transmission mode 2 UE which selects the transmission resources for the D2D communications,
wherein a maximum value of a set of values available as k being the number of is in the first subframe indicator bitmap is larger than a maximum value of a set of values available as k being the number of 1s in the second subframe indicator bitmap,
determine a set of subframes to transmit D2D data by using the bitmap to the subframe pool for data transmission, and
transmit D2D data in a subframe included in the determined subframe set.

8. The apparatus according to claim 7 , wherein a set of values available as k in transmission mode 2 of the UE is a subset of a set of values available as k in transmission mode 1 of the UE.

9. The apparatus according to claim 7 , wherein if the transmission mode of the UE is transmission mode 2 and a UL/DL configuration configured for the UE is one of UL/DL configurations 1, 2, 4, and 5, the set of values available as k is {1, 2, 4}.

10. The apparatus according to claim 7 , wherein if the transmission mode of the UE is transmission mode 2 and a UL/DL configuration configured for the UE is UL/DL configuration 0, the set of values available as k is {1, 2, 3, 4, 5}.

11. The apparatus according to claim 7 , wherein if the transmission mode of the UE is transmission mode 2 and a UL/DL configuration configured for the UE is one of UL/DL configurations 3 and 6, the set of values available as k is {1, 2, 3, 4}.

12. The apparatus according to claim 7 , wherein if the transmission mode of the UE is transmission mode 2 and a duplex mode of the UE is Frequency Division Duplex (FDD), the set of values available as k is {1, 2, 4}.

Assignees

• Lg Electronics Inc

Inventors

• Chae Hyukjin
• Seo Hanbyul

Classifications

• H04W72/0446 Primary

  Resources in time domain, e.g. slots or frames · CPC title

• H04W72/23

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

• H04W72/21 Primary

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title