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D2D transmission method and device

A transmission method and equipment technology, applied in the communication field, can solve problems such as half-coverage and coverage D2D cannot be realized

Inactive Publication Date: 2016-11-23
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a device-to-device D2D transmission method and device to at least solve the problem in the related art that D2D discovery between devices in half-coverage and out-of-coverage scenarios cannot be realized

Method used

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  • D2D transmission method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] When the out-of-coverage D2D UE (same as the above-mentioned device) does not currently obtain the synchronization source, it can search for the D2D synchronization signal by continuously scanning the frequency domain where the D2D synchronization signal is located, so as to obtain the D2D synchronization source. In the out-of-coverage scenario, the synchronization source obtained by the D2D UE is the D2D UE. In a half-coverage scenario, out-of-coverage UEs are prioritized to synchronize to in-coverage synchronization sources, including discovery UEs and / or communication UEs.

[0115] In one case, if there are only discovery UEs in the LTE R12 phase within the coverage, then the discovery UEs within the coverage can send a D2D synchronization signal at most once in a discovery resource pool cycle. In this case, the out-of-coverage discovery UEs search for D2D synchronization through continuous scanning Signal, the search time will be longer. Therefore, the out-of-cover...

Embodiment 2

[0120] When the out-of-coverage D2D UE has obtained the synchronization source, it searches for a new D2D synchronization signal in the scan window based on the timing reference of the obtained synchronization source. Priority criteria to reselect the synchronization source.

[0121] The length and distribution period of the scanning window are fixed or pre-configured. The width of the scanning window can be set to 40ms, 60ms, 80ms, 100ms, 120ms, 160ms, etc. The distribution period of the scanning window can be set to 40ms, 80ms, 160ms, 320ms, 640ms, 1280ms, 2560ms, 5120ms, 10240ms, etc.

[0122] When searching for time domain resources within the scanning window for new D2D synchronization signals, the D2D UE does not send D2D synchronization signals and / or channels and D2D signals and / or data.

[0123] In the synchronization source priority criteria followed by the D2D UE to reselect the D2D synchronization source, the priority of the synchronization source UE within the co...

Embodiment 3

[0127] For out-of-coverage discovery UEs, set the D2D synchronization resource period periodically, such as 40ms, 80ms or 160ms, and configure one D2D synchronization resource for each D2D synchronization resource period, or configure multiple D2D synchronization resources, such as 2 or 3 . If one D2D synchronization resource is configured for each D2D synchronization resource period, the offset of the D2D synchronization resource is the same as the offset of the D2D synchronization resource of the UE within the R12 coverage. The offset of the D2D synchronization resource mentioned here is SFN (System Frame Number ) or the offset of the D2D synchronization resource relative to SFN#0 or DFN#0 in the first D2D synchronization resource period in the DFN (D2D Frame Number) cycle, with a granularity of 1 subframe. If two D2D synchronization resources are configured in each D2D synchronization resource period, the offset of the first D2D synchronization resource in the D2D synchroni...

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Abstract

The invention provides a D2D (Device to Device) transmission method and device. The method includes that a device searches a first synchronization signal and determines whether to send a second synchronization signal or not according to the searching result; the device determines resource used for D2D transmission on the basis of searching the first synchronization signal; a D2D signal and / or D2D data are transmitted on the resource. According to the invention, D2D detection problems in external scene where semi-covering and full-covering cannot be realized in related art are solved and D2D detection effect among devices is achieved further.

Description

technical field [0001] The present invention relates to the communication field, and in particular, relates to a device-to-device D2D transmission method and device. Background technique [0002] In a cellular communication system, when there is service transmission between two user equipments (UE for short), for example, the service data from user equipment 1 (UE1) to user equipment 2 (UE2) is first transmitted to A base station (Base Station, BS for short, or Node B, or evolved (evolved) Node B) of the cell where UE1 is located transmits the user data to the base station of the cell where UE2 is located via the core network, and the base station then transmits the user data to the base station of the cell where UE2 is located. The above service data is transmitted to UE2 through the air interface. The service data transmission from UE2 to UE1 adopts a similar processing flow. Such as figure 1 as shown, figure 1 It is a schematic diagram of cellular communication of UEs...

Claims

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Application Information

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IPC IPC(8): H04W8/00H04W56/00
CPCH04W56/00
Inventor 黄双红吴栓栓卢有雄袁弋非杨瑾王文焕
Owner ZTE CORP
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