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A device discovering method and a device discovering apparatus used for device-to-device communication

A technology for device communication and device discovery, which is applied in the direction of synchronization devices, wireless communication, digital transmission systems, etc., and can solve problems such as inappropriate cellular communication methods

Inactive Publication Date: 2014-03-26
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that if UE 1 and UE 2 are located in the same cell and are relatively close to each other, then the above cellular communication method is obviously not optimal

Method used

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  • A device discovering method and a device discovering apparatus used for device-to-device communication
  • A device discovering method and a device discovering apparatus used for device-to-device communication
  • A device discovering method and a device discovering apparatus used for device-to-device communication

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0092] In order to implement device discovery during device-to-device communication, the user equipment needs to send a signal for device discovery in a preset format (for convenience of description, it is called a discovery channel). The discovery channel includes at least two parts: an information part and a guard interval part.

[0093]Wherein, the information part has the function of identifying the user equipment, and can be carried on the discovery channel in the form of data blocks or sequences. For example, the information may include identification information of the user equipment and the like. The sequence may be a reference signal (RS, Reference Signal) sequence, or a Walsh code, or a dedicated constant amplitude zero autocorrelation (CAZAC, Const Amplitude Zero Auto Correlation) code.

[0094] The guard interval part is used to prevent the discovery channel sent by the user equipment from interfering with other channels, that is, to separate the discovery channel...

example 2

[0103] In order to implement device discovery during device-to-device communication, the user equipment needs to send a discovery signal in a preset discovery channel format. The preset means that the structure of the discovery channel is determined. In this example, the structure of the discovery channel includes three parts: a cyclic prefix part, an information part and a guard interval part.

[0104] The discovery channel may be carried by uplink resources of cellular communication. At this time, it can be agreed that the first user equipment on the sending side sends the discovery signal according to the preset discovery channel format according to the downlink receiving timing of its own cellular link; Describe the discovery channel. In this way, when performing D2D discovery, there is no restriction on UE cellular uplink synchronization, thereby improving the efficiency of D2D discovery and reducing the time delay of D2D discovery.

[0105] However, since the two user...

example 3

[0114] As described in Example 1 and Example 2, the time length of the cyclic prefix part in the D2D discovery channel is determined according to the scope of the D2D discovery, and may have a fixed time length.

[0115] Assuming that the maximum coverage found by D2D is X meters, then the time for the signal to go to and from X meters is 2×X / (3×10 8 ) seconds, if the time length of CP is greater than 2×X / (3×10 8 ), it can ensure that within the coverage of the D2D discovery, the user equipment receives the complete D2D discovery channel information part. However, the CP still needs to overcome the inter-symbol interference problem caused by the multipath transmission of signals, so the length of the CP can be increased to ensure that the multipath delay is also included in the CP length.

[0116] Being able to have a fixed length of time means that the maximum coverage of D2D discovery can be fixed. In this case, the CP is determined and fixed according to the maximum covera...

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Abstract

The invention discloses a device discovering method used for device-to-device communication. The method comprises that a user equipment UE transmits a discovery channel used for discovering equipment, wherein the discovery channel comprises at least an information portion and a protection interval portion; that the information portion is used for identifying the UE; that the protection interval portion is used for separating the discovery channel from other channels in time domain; and that other channels are device-to-device communication channels or cellular communication channels transmitted from other UE. The invention also discloses a device discovering apparatus used for device-to-device communication. The technical scheme of the invention resolves a device discovery problem of D2D communication in a cellular communication system, considers the coverage of cellular cells when the discovery channel is designed, prevents D2D discovery from interfering with cellular communication. The CP length of the discovery channel is determined by the coverage of the D2D discovery such that equipment discovery efficiency under a condition that UEs are not synchronized is guaranteed.

Description

technical field [0001] The invention relates to user equipment discovery technology, in particular to a device discovery method and device for device-to-device communication in a cellular communication network. Background technique [0002] Due to the realization of the multiplexing of limited spectrum resources in cellular communication, the wireless communication technology has been developed vigorously. In a cellular communication system, when there is service transmission between two user equipments (UE, User Equipment), the service data from user equipment 1 (UE1) to user equipment 2 (UE2) will first be transmitted to the cell where UE1 is located through the air interface The base station (Node B, Base Station or evolved Node B), the base station transmits the user data to the base station of the cell where UE2 is located through the core network, and the base station of the cell where UE2 is located then transmits the above service data to UE2 through the air interfac...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04W74/08H04L27/26
CPCH04L1/00H04W8/005
Inventor 吴栓栓任海涛袁弋非袁明杨瑾梁枫
Owner ZTE CORP
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