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Synchronization method in D2D communication

A technology of block synchronization and synchronous information, which is applied in the field of communication, can solve problems affecting timing accuracy and achieve the effect of improving timing accuracy

Inactive Publication Date: 2017-03-08
BEIJING XINWEI TELECOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This condition can seriously affect the timing accuracy

Method used

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  • Synchronization method in D2D communication

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Experimental program
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Embodiment 1

[0047] The N (N>=3) blocks of synchronization resources configured in the synchronization period T mentioned in the present invention can be allocated continuously or discontinuously. Please refer to figure 1 , gives a schematic diagram of continuous allocation and discontinuous allocation of synchronization resources.

[0048] By continuously allocating resources, only the location information of the first synchronization resource can be given, and the location information of other synchronization resources can be deduced based on the location information of the first synchronization resource, which reduces signaling overhead.

[0049] In the discontinuous allocation of resources, it is necessary to indicate the position of each block of synchronization resources, and the signaling overhead is large, but at the same time, the mutual interference between each block of synchronization resources in the synchronization period T will be reduced. When N blocks of synchronization r...

Embodiment 2

[0051] Please refer to figure 2 , gives a schematic diagram of synchronization information resource mapping of D2D terminals of different synchronization levels in the present invention. UE1, UE2, ..., UE(N), UE(N+1), UE(N+2), ..., UE(2N), ..., UE(M-1), UE(M) in the figure are respectively D2D terminals whose synchronization level is level 1, level 2, ..., level N, level N+1, level N+2, ..., level 2N, ..., level M-1, level M.

[0052] Since N (N>=3) blocks of synchronization resources are configured in the synchronization period T and M>=N, the resource mapping situation is: D2D terminals UE1, UE2, UE1, UE2, ..., the synchronization information of UE(N) is sequentially mapped to the 1st, 2nd, ..., Nth block of synchronization resources; D2D terminal UEs with synchronization levels of N+1, N+2, ..., 2N The synchronization information of (N+1), UE(N+2), ..., UE(2N) is also mapped to the synchronization resources of the first block, the second block, ..., and the Nth block in ...

Embodiment 3

[0055] Please refer to image 3 , a schematic diagram of a scene topology using the D2D communication synchronization method of the present invention is given. image 3 The scenario in describes the process of realizing synchronization between D2D terminals using the synchronization method proposed by the present invention without network participation and completely offline. The S node in the figure is the D2D terminal that determines the synchronization clock. When the node does not find a synchronization reference to follow, it determines the synchronization clock according to its own clock, and starts to send synchronization information on the first synchronization resource. The synchronization level of this node is level 1, such as S node. image 3 The nodes in the secondary, tertiary, ..., M-level rings are D2D terminals with synchronization levels of 2, 3, ..., and M respectively, and follow the synchronization levels of 1, 2, ..., M respectively. - Sync reference for...

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Abstract

The invention provides a synchronization method in D2D communication. The method comprises the steps of configuring N synchronization resources in a synchronization cycle T, wherein the N is more than or equal to 3; and sending synchronization information on different synchronization resources by D2D terminals of different synchronization levels, wherein the synchronization information contains carried synchronization clock identifiers and the synchronization levels of the D2D terminals which send the synchronization information. According to the method, a superior node and a subordinate node of a node are ensured to send the synchronization information on different synchronization resources, the problem that disappearance of the superior node cannot be detected is solved, and the timing precision is improved.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a synchronization method in D2D communication. Background technique [0002] With the rapid development and diversification of mobile communication services, such as social networking, short-distance data sharing between users, electronic payment, and local advertisements, the demand for communication between short-distance users is increasing. The LTE D2D technology is an LTE-based terminal-to-terminal direct communication technology proposed by 3GPP for such requirements. Since the data transmission between D2D terminals does not need to pass through the transfer of the base station, the data transmission pressure of the cellular network is reduced. 3GPP SA1 divides the application scenarios of LTE D2D into two categories: public security and commercial applications. Among them, public safety refers to the application scenario where the cellular network fails to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/00H04W56/00
CPCH04W56/001
Inventor 戴维琴李静叶孙鹏
Owner BEIJING XINWEI TELECOM TECH