Method and apparatus for configuring dm-rs for v2x

Patent metadata

Field	Value
Publication number	US-2018352549-A1
Application number	US-201816039973-A
Country	US
Kind code	A1
Filing date	Jul 19, 2018
Priority date	Sep 25, 2015
Publication date	Dec 6, 2018
Grant date	—

Abstract

A method includes generating a first DM-RS for V2X communication and a second DM-RS for V2X communication, the first DM-RS for V2X communication being mapped in a first symbol in a first slot of a subframe, the second DM-RS for V2X communication being mapped in a second symbol in the first slot; generating a third DM-RS for V2X communication and a fourth DM-RS for V2X communication, the third DM-RS for V2X communication being mapped in a first symbol in a second slot of the subframe, the fourth DM-RS for V2X communication being mapped in a second symbol in the second slot; and transmitting the first DM-RS for V2X communication, the second DM-RS for V2X communication, the third DM-RS for V2X communication, and the fourth DM-RS for V2X communication. The first DM-RS is generated based on a first group-hopping, and the second DM-RS is generated based on a second group-hopping.

First claim

What is claimed is:

1 . A device to transmit Demodulation-Reference Signal (DM-RS) configured for Vehicle-to-everything (V2X) communication, the device comprising:
a transceiver; and a processor configured to: determine, based on a first group-hopping associated with a first slot of a subframe, a first DM-RS for V2X communication, and generate, based on a second group-hopping associated with the first slot and with an offset, a second DM-RS for V2X communication, wherein the first group-hopping and the second group-hopping apply different inputs in a pseudo-random sequence; map the first DM-RS for V2X communication in a first symbol in the first slot of the subframe, and map the second DM-RS for V2X communication in a second symbol in the first slot of the subframe; determine, based on a third group-hopping associated with a second slot of the subframe, a third DM-RS for V2X communication, and generate, based on a fourth group-hopping associated with the second slot and with an offset, a fourth DM-RS for V2X communication, wherein the third group-hopping and the fourth group-hopping apply different inputs in the pseudo-random sequence; and map the third DM-RS for V2X communication in a first symbol in the second slot of the subframe, and map the fourth DM-RS for V2X communication in a second symbol in the second slot of the subframe, wherein the transceiver transmits the mapped first DM-RS for V2X communication, the mapped second DM-RS for V2X communication, the mapped third DM-RS for V2X communication, and the mapped fourth DM-RS for V2X communication.

2 . The device of claim 1 , wherein the first group-hopping is associated with a first equation, (Σ i=0 7 c(16n SS PSSCH +i)·2 i )mod30, and
wherein the second group-hopping is associated with a second equation,
(Σ i=0 7 c (16 n SS PSSCH +8+ i )·2 i )mod30,

where c(x) for the first equation and the second equation denotes the pseudo-random sequence that is defined as a length-31 Gold sequence and n SS PSSCH denotes a current slot number in a subframe pool for a sidelink.

3 . The device of claim 2 , wherein n SS PSSCH =k for the first slot of the subframe and n SS PSSCH =k+1 for the second slot of the subframe, where k is a non-negative integer.

4 . The device of claim 1 , wherein the processor is configured to apply first orthogonal sequence [+1 +1 +1 +1] or second orthogonal sequence [+1 −1 +1 −1] in association with the first, second, third, and fourth DM-RSs for V2X communication.

5 . The device of claim 4 , wherein the first orthogonal sequence [+1 +1 +1 +1] is configured to be applied when a modulo-2 operation of an identifier is equal to zero, and
wherein the second orthogonal sequence [+1 −1 +1 −1] is configured to be applied when the modulo-2 operation of the identifier is equal to one.

6 . The device of claim 1 , further comprising:
determining to send, to a target device, a V2X data channel; and determining, for mapping the first, second, third, and fourth DM-RSs, a plurality of symbols in the first slot of the subframe and a plurality of symbols in the second slot of the subframe, wherein the first, second, third, and fourth DM-RSs are associated with the V2X data channel.

7 . The device of claim 1 , further comprising:
determining whether to enable a group-hopping for DM-RSs associated with a V2X data channel.

8 . A device to transmit Demodulation-Reference Signal (DM-RS) for Vehicle-to-everything (V2X) communication, the device comprising:
a transceiver; and a processor configured to: determine, based on a first group-hopping associated with a first slot number of a subframe, a first DM-RS for V2X communication, and generate, based on a second group-hopping associated with the first slot number and with an offset, a second DM-RS for V2X communication, wherein the first group-hopping and the second group-hopping apply different inputs in a pseudo-random sequence; map the first DM-RS for V2X communication in a first symbol in a first slot of the subframe, and map the second DM-RS for V2X communication in a second symbol in the first slot of the subframe; determine, based on a third group-hopping associated with a second slot number of the subframe, a third DM-RS for V2X communication, and generate, based on a fourth group-hopping associated with the second slot number and with an offset, a fourth DM-RS for V2X communication, wherein the third group-hopping and the fourth group-hopping apply different inputs in the pseudo-random sequence; and map the third DM-RS for V2X communication in a first symbol in a second slot of the subframe, and map the fourth DM-RS for V2X communication in a second symbol in the second slot of the subframe, wherein the transceiver transmits the mapped first DM-RS for V2X communication, the mapped second DM-RS for V2X communication, the mapped third DM-RS for V2X communication, and the mapped fourth DM-RS for V2X communication, wherein each of the first slot and the second slot consists of seven symbols, respectively, wherein the first slot precedes the second slot in a time axis, wherein the first symbol in the first slot is symbol #2 and the second symbol in the first slot is symbol #5 if the seven symbols in the first slot are arranged from symbol #0 to symbol #6, and wherein the first symbol in the second slot is symbol #1 and the second symbol in the second slot is symbol #4 if the seven symbols in the second slot are arranged from symbol #0 to symbol #6.

9 . The device of claim 8 , wherein the first group-hopping is associated with a first equation, (Σ i=0 7 c(16n SS PSSCH +i)·2 i )mod30, and
wherein the second group-hopping is associated with a second equation,
(Σ i=0 7 c (16 n SS PSSCH +8+ i )·2 i )mod30,

where c(x) for the first equation and the second equation denotes the pseudo-random sequence that is defined as a length-31 Gold sequence and n SS PSSCH denotes a current slot number in a subframe pool for a sidelink.

10 . The device of claim 9 , wherein n SS PSSCH =k for the first slot of the subframe and n SS PSSCH =k+1 for the second slot of the subframe, where k is a non-negative integer.

11 . The device of claim 8 , wherein the processor is configured to apply first orthogonal sequence [+1 +1 +1 +1] or second orthogonal sequence [+1 −1 +1 −1] in association with the first, second, third, and fourth DM-RSs for V2X communication.

12 . The device of claim 11 , wherein the first orthogonal sequence [+1 +1 +1 +1] is configured to be applied when a modulo-2 operation of an identifier is equal to zero, and
wherein the second orthogonal sequence [+1 −1 +1 −1] is configured to be applied when the modulo-2 operation of the identifier is equal to one.

13 . A device to transmit Demodulation-Reference Signal (DM-RS) configured for Vehicle-to-everything (V2X) communication, the device comprising:
a processor configured to: determine, based on a first group-hopping associated with a first slot number of a subframe, a first DM-RS for V2X communication, and generate, based on a second group-hopping associated with the first slot number and with an offset, a second DM-RS for V2X communication, the first DM-RS for V2X communication being mapped in a first symbol in a first slot of the subframe, the second DM-RS for V2X communication being mapped in a second symbol in the first slot of the subframe; determine, based on a third group-hopping associated with a second slot number of the subframe, a third DM-RS for V2X communication, and generate, based on a fourth group-hopping associated with the second slot number and with an offset, a fourth DM-RS for V2X communicatio

Assignees

• Innovative Tech Lab Co Ltd

Inventors

• Yoon Sung Jun

Classifications

• H04L5/0012

  Hopping in multicarrier systems · CPC title

• H04L5/005 Primary

  of common pilots, i.e. pilots destined for multiple users or terminals · CPC title

• H04W72/0446 Primary

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

• H04L27/2613 Primary

  Structure of the reference signals · CPC title

• H04W4/40 Primary

  for vehicles, e.g. vehicle-to-pedestrians [V2P] · CPC title