Method and apparatus for transmitting signal between user equipments

Patent metadata

Field	Value
Publication number	US-10044479-B2
Application number	US-201514881699-A
Country	US
Kind code	B2
Filing date	Oct 13, 2015
Priority date	Jul 26, 2013
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

The present invention discloses a method and an apparatus for transmitting a signal between user equipments. A quantity of OFDM symbols included in a first subframe sent by a first user equipment to a second user equipment is less than a quantity of OFDM symbols included in a second subframe sent by the first user equipment to a network device, where the second subframe includes 14 OFDM symbols, the first subframe includes 13, 12, or 7 OFDM symbols, and the OFDM symbol includes valid data and a cyclic prefix. In this way, interference between OFDM symbols may be avoided, and performance of a D2D ProSe is improved.

First claim

What is claimed is:

1. A method for transmitting a signal between user equipments, comprising:
inserting, by a first user equipment, a reference signal into a first subframe according to a reference signal insert mode corresponding to the first subframe; and
sending, by the first user equipment, the first subframe to a second user equipment, wherein
a quantity of orthogonal frequency division multiplexing (OFDM) symbols comprised in the first subframe is less than a quantity of OFDM symbols comprised in a second subframe, and the second subframe is a subframe received by a network device;
the second subframe comprises 14 OFDM symbols, the first subframe comprises 13, 12, or 7 OFDM symbols, and the OFDM symbol comprises valid data and a cyclic prefix, and wherein
if the first subframe comprises 13 OFDM symbols, the reference signal insert mode corresponding to the first subframe comprises at least one of a first reference signal insert mode to a forty-first reference signal insert mode; or
if the first subframe comprises 12 OFDM symbols, the reference signal insert mode corresponding to the first subframe comprises at least one of a forty-second reference signal insert mode to a forty-third reference signal insert mode; or
if the first subframe comprises 7 OFDM symbols, the reference signal insert mode corresponding to the first subframe comprises at least one of a forty-fourth reference signal insert mode to a forty-fifth reference signal insert mode.

2. The method according to claim 1 , wherein a time length of the first subframe is 1 millisecond or 30,720 timeslots; and
if the first subframe comprises 13 OFDM symbols, subcarriers of the 13 OFDM symbols are 15 KHz, a time length of valid data of each OFDM symbol is 2,048 timeslots, and time lengths of cyclic prefixes of the 13 OFDM symbols are less than or equal to 2*2,048 timeslots and are greater than or equal to 1*2,048 timeslots; or
if the first subframe comprises 12 OFDM symbols, subcarriers of the 12 OFDM symbols are 15 KHz, a time length of valid data of each OFDM symbol is 2,048 timeslots, and time lengths of cyclic prefixes of the 12 OFDM symbols are less than or equal to 3*2,048 timeslots and are greater than or equal to 2*2,048 timeslots; or
if the first subframe comprises 7 OFDM symbols, subcarriers of the 7 OFDM symbols are 7.5 KHz, a time length of valid data of each OFDM symbol is 4,096 timeslots, and time lengths of cyclic prefixes of the 7 OFDM symbols are less than or equal to 2,048 timeslots.

3. The method according to claim 1 , wherein
if the first subframe comprises 13 OFDM symbols, a time length of the first OFDM symbol of the 13 OFDM symbols is 316 timeslots plus 2,048 timeslots, and time lengths of the second to thirteenth OFDM symbols are all 315 timeslots plus 2,048 timeslots, wherein a time length of a cyclic prefix of the first OFDM symbol is 316 timeslots, and time lengths of cyclic prefixes of the second to thirteenth OFDM symbols are all 315 timeslots; or
if the first subframe comprises 12 OFDM symbols, a time length of each OFDM symbol of the 12 OFDM symbols is 512 timeslots plus 2,048 timeslots, wherein a time length of a cyclic prefix of each OFDM symbol is 512 timeslots; or
if the first subframe comprises 7 OFDM symbols, time lengths of the first OFDM symbol and the fourth OFDM symbol of the 7 OFDM symbols are both 304 timeslots plus 2,048 timeslots, and time lengths of the second, third, fifth, sixth, and seventh OFDM symbols are all 288 timeslots plus 2,048 timeslots, wherein time lengths of cyclic prefixes of the first OFDM symbol and the fourth OFDM symbol are both 304 timeslots, and time lengths of cyclic prefixes of the second, third, fifth, sixth, and seventh OFDM symbols are all 288 timeslots.

4. The method according to claim 1 , wherein the sending, by a first user equipment, a first subframe to a second user equipment comprises:
sending, by the first user equipment, the first subframe into which the reference signal is inserted to the second user equipment, so that the second user equipment parses the first subframe according to the reference signal inserted into the first subframe.

5. An apparatus for transmitting a signal between user equipments, located on a side of a user equipment, comprising:
a memory storing program(s); and
a processor in communication with the memory to execute the program(s) to implement:
a configuration module, configured to insert a reference signal into the first subframe according to a reference signal insert mode corresponding to the first subframe;
a sending module, configured to send the first subframe to another user equipment, wherein
a quantity of orthogonal frequency division multiplexing (OFDM) symbols comprised in the first subframe is less than a quantity of OFDM symbols comprised in a second subframe, and the second subframe is a subframe received by a network device; and
the second subframe comprises 14 OFDM symbols, the first subframe comprises 13, 12, or 7 OFDM symbols, and the OFDM symbol comprises valid data and a cyclic prefix, wherein if the first subframe comprises 13 OFDM symbols, the reference signal insert mode corresponding to the subframe comprises at least one of a first reference signal insert mode to a forty-first reference signal insert mode; or
if the first subframe comprises 12 OFDM symbols, the reference signal insert mode corresponding to the first subframe comprises at least one of a forty-second reference signal insert mode to a forty-third reference signal insert mode; or
if the first subframe comprises 7 OFDM symbols, the reference signal insert mode corresponding to the first subframe comprises at least one of a forty-fourth reference signal insert mode to a forty-fifth reference signal insert mode.

6. The apparatus according to claim 5 , wherein a time length of the first subframe is 1 millisecond or 30,720 timeslots; and
if the first subframe comprises 13 OFDM symbols, subcarriers of the 13 OFDM symbols are 15 KHz, a time length of valid data of each OFDM symbol is 2,048 timeslots, and time lengths of cyclic prefixes of the 13 OFDM symbols are less than or equal to 2*2,048 timeslots and are greater than or equal to 1*2,048 timeslots; or
if the first subframe comprises 12 OFDM symbols, subcarriers of the 12 OFDM symbols are 15 KHz, a time length of valid data of each OFDM symbol is 2,048 timeslots, and time lengths of cyclic prefixes of the 12 OFDM symbols are less than or equal to 3*2,048 timeslots and are greater than or equal to 2*2,048 timeslots; or
if the first subframe comprises 7 OFDM symbols, subcarriers of the 7 OFDM symbols are 7.5 KHz, a time length of valid data of each OFDM symbol is 4,096 timeslots, and time lengths of cyclic prefixes of the 7 OFDM symbols are less than or equal to 2,048 timeslots.

7. The apparatus according to claim 5 , wherein
if the first subframe comprises 13 OFDM symbols, a time length of the first OFDM symbol of the 13 OFDM symbols is 316 timeslots plus 2,048 timeslots, and time lengths of the second to thirteenth OFDM symbols are all 315 timeslots plus 2,048 timeslots, wherein a time length of a cyclic prefix of the first OFDM symbol is 316 timeslots, and time lengths of cyclic prefixes of the second to thirteenth OFDM symbols are all 315 timeslots; or
if the first subframe comprises 12 OFDM symbols, a time length of each OFDM symbol of the 12 OFDM symbols is 512 timeslots plus 2,048 timeslots, wherein a time length of a cyclic prefix of each OFDM symbol is 512 timeslots; or
if the first subframe comprises 7 OFDM symbols, time lengths of the first OFDM symbol and the fourth OFDM symbol of the 7 OFDM symbols are both 304 timeslots plus 2,048 timeslots, and time lengths of the second, third, fifth, sixth, and seventh OFDM symbols are all 288 timeslots p

Assignees

• Huawei Device Co Ltd

Inventors

• Wang Jian

Classifications

• H04L5/0007

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

• H04L27/2607

  Cyclic extensions · CPC title

• H04L5/0048 Primary

  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

• H04W88/04

  adapted for relaying to or from another terminal or user · CPC title

• H04L5/0044 Primary

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title