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DMRS configuring method and device in V2X communication

A technology for configuring modules and allocating resources, applied in the field of communication

Inactive Publication Date: 2018-01-23
BEIJING XINWEI TELECOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to propose a method and device for configuring DMRS in V2X communication, aiming to solve how to satisfy the orthogonality of DMRS between different users when a large number of users use the same resources or part of the same resources to transmit data in V2X communication to distinguish between different users' problems

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  • DMRS configuring method and device in V2X communication
  • DMRS configuring method and device in V2X communication

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Embodiment 1

[0064] refer to figure 1 , figure 1 It is a schematic flowchart of a method for configuring a DMRS in V2X communication provided by Embodiment 1 of the present invention.

[0065] Such as figure 1 As shown, the method for configuring DMRS in the V2X communication includes:

[0066] Step 101, obtaining a preset way of configuring DMRS;

[0067] Specifically, the manner of configuring the DMRS may be pre-configured, and the manner of configuring the DMRS includes but is not limited to the following three situations:

[0068] In the first case, the manner of configuring the DMRS includes distinguishing 4 different users through an orthogonal mask of OCC=4 in the time domain.

[0069] In the second case, the manner of configuring the DMRS includes using an orthogonal mask of OCC=N1 to distinguish N1 different users in the frequency domain.

[0070] In the third case, the manner of configuring the DMRS includes using a demodulation reference signal base sequence with little co...

Embodiment 2

[0075] refer to figure 2 , figure 2 It is a schematic flowchart of a method for configuring a DMRS in V2X communication provided by Embodiment 2 of the present invention.

[0076] Such as figure 2 As shown, the method for configuring DMRS in the V2X communication includes:

[0077] Step 201, obtaining a preset way of configuring DMRS, the way of configuring DMRS includes distinguishing 4 different users through an orthogonal mask of OCC=4 in the time domain;

[0078] Step 202, configure the user's DMRS according to the preset DMRS configuration manner.

[0079] Specifically, for the first case, a subframe in V2X communication includes 4 DMRS symbols, so an orthogonal mask with OCC=4 can be used in the time domain to distinguish 4 different users, as shown in Table 1 below. When using this scheme, it is necessary to ensure that the channel variation between different DMRS symbols is small, so it is only applicable to low-speed scenarios.

[0080]

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Embodiment 3

[0090] refer to Figure 4 , Figure 4 It is a schematic flowchart of a method for configuring a DMRS in V2X communication provided by Embodiment 3 of the present invention.

[0091] Such as Figure 4 As shown, the method for configuring DMRS in the V2X communication includes:

[0092] Step 401, obtaining a preset way of configuring DMRS, the way of configuring DMRS includes using an orthogonal mask of OCC=N1 to distinguish N1 different users in the frequency domain;

[0093] Step 402, configure the user's DMRS according to the preset DMRS configuration manner.

[0094] Specifically, for the second case, an orthogonal mask of OCC=N1 is used on consecutive N1 (even-numbered) subcarriers in the frequency domain to distinguish N1 different users.

[0095] N1 must be an even number. The larger N1 is, the more users can be distinguished, but at the same time, it will increase the PAPR of some users on some DMRS symbols and reduce the accuracy of channel estimation. The specific ...

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Abstract

The invention discloses a DMRS configuring method and device in V2X communication. The DMRS configuring method comprises the steps that four different users are distinguished in a time domain by usingan orthogonal mask of OCC=4; and / or, N1 different users are distinguished in a frequency domain by using an orthogonal mask of OCC=N1; and / or, a demodulation reference signal base sequence with low correlation is used on the same extension bandwidth, or different cyclic shifts of the same DMRS base sequence are used to increase the number of differentiable users of DMRS to accommodate the problemof large user density in V2X communication; and when relevant parameters of DMRS are selected, the orthogonality of DMRS symbols among users can be improved according to known information.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of communication, and in particular to a method and device for configuring a DMRS in V2X communication. Background technique [0002] In R12D2D (release 12 device to device), a D2D message consists of two parts: control information (scheduling assignment, SA) and data information (data). SA is used to indicate the resource location where the data is located and related parameters. When the user transmits data, the demodulation reference signal (Demodulation Reference Signal, DMRS) performs group hopping, cyclic shift, and orthogonal mask (Orthogonal cover code, OCC) according to the SA ID (target group ID) value contained in the corresponding SA. ) and other configurations to randomize the interference of DMRS symbols between different users using part of the same resource or part of the same resource. [0003] V2X (vehicle to X) is a vehicle networking communication technology that m...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04W4/70H04W4/40
Inventor 王夏男孙鹏
Owner BEIJING XINWEI TELECOM TECH
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