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D2D device discovery method and device based on LTE cellular communication system

A cellular communication system and device discovery technology, which is applied in the field of D2D device discovery methods and devices, can solve problems such as ineffective discovery and waste of system power, and achieve the effects of realizing D2D communication, saving power, and improving system efficiency

Inactive Publication Date: 2013-12-04
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the prior art, in the D2D communication system, the system devices all work in an asynchronous mode, so that during the mutual discovery process of the D2D user equipment (User Equipment, UE), the UE cannot effectively discover other UEs, wasting system power

Method used

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  • D2D device discovery method and device based on LTE cellular communication system
  • D2D device discovery method and device based on LTE cellular communication system
  • D2D device discovery method and device based on LTE cellular communication system

Examples

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Embodiment 1

[0040] figure 1It shows a schematic diagram of the network deployment of the D2D device discovery system based on the LTE cellular communication system provided by Embodiment 1 of the present invention. The system includes multiple D2D UEs, and the process of realizing device discovery between the D2D UE devices based on the LTE cellular communication system As follows: each D2D UE obtains its own timing through the LTE cellular system, sends a device discovery signal in the discovery subframe, and receives the device discovery signal of other D2D UEs in the discovery subframe. The device discovery signal includes pilot OFDM symbols and device Information OFDM symbols, so as to complete the device discovery between D2D UEs, and obtain the basic information and timing of adjacent D2D UEs, so as to realize mutual discovery between D2D UEs. Taking the first D2D UE 11 and the second D2D UE 12 as an example, the process of realizing device discovery by the first D2D UE 11 and the s...

Embodiment 2

[0052] In this embodiment, during the D2D device discovery process, the timing structure of the D2D communication network can adopt a timing structure similar to that of the LTE cellular network, such as image 3 As shown, similar to the timing structure of LTE, each subframe has a length of 1 ms and consists of 2 time slots of 0.5 ms, and each time slot consists of 6 (extended cyclic prefix (cyclic prefix, CP)) or 7 (common CP ) OFDM symbols. Every 10 subframes form a 10ms radio frame. Each subframe is roughly divided into three types according to usage: a discovery subframe, a paging subframe, and a communication subframe.

[0053] In this embodiment, the discovery subframe is mainly used for device discovery, which carries information such as pilot frequency, device identifier, device type, and service provided by the device. Each D2D UE discovers other adjacent D2D UEs through the discovery subframe And its equipment information provide sufficient conditions for further ...

Embodiment 3

[0060] The D2D device discovery method based on the LTE cellular communication system provided by the embodiment of the present invention may further include: the first D2D UE sends a device discovery signal to the second D2D UE in the discovery subframe according to the timing information, so that the second D2D UE The D2D UE receives the device discovery signal sent by the first D2D UE in the discovery subframe, and correlates the pilot OFDM symbol of the device discovery signal received in the discovery subframe with the local pilot sequence in time domain, and obtains the device discovery signal of the first D2D UE. The time when the discovery signal arrives at the second D2D UE, and analyze the device information OFDM symbol of the device discovery signal received in the discovery subframe, and obtain the device information of the first D2D UE, so that the second D2D UE can realize the device discovery of the first D2D UE . This step may be before the device discovery of ...

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Abstract

The invention belongs to the field of communication technologies, and provides a D2D device discovery method and device based on an LTE cellular communication system. The method includes the steps that step 1, timing information of first D2D UE is obtained by the first D2D UE through the LTE cellular communication system; step 2, device discovery signals sent by second D2D UE through a discovery subframe are received in the discovery subframe according to the timing information; step 3, the time when the device discovery signals of the second D2D UE reach the first D2D UE is obtained through time domain correlation on pilot frequency OFDM symbols of the device discovery signals received in the discovery subframe and local pilot frequency sequences, device information OFDM symbols of the device discovery signals received in the discovery subframe are analyzed, device information of the second D2D UE is obtained, and therefore device discovery of the D2D UE is achieved. According to the D2D device discovery method and device, one D2D UE can effectively discover other D2D UE, system efficiency is improved, and power of the D2D UE is saved.

Description

technical field [0001] The present invention belongs to the technical field of communication, and in particular relates to a D2D device discovery method and device based on a long term evolution (Long Term Evolution, LTE) cellular communication system. Background technique [0002] In the past 20 years, wireless communication technology has achieved great development, and wireless communication technology is also emerging in an endless stream. With its great flexibility, the wireless communication network is increasingly occupying people's lives and becoming an indispensable part of people's lives. [0003] However, wireless spectrum resources are limited. With the rapid increase of the number of people using wireless communication networks and the increasing requirements for wireless communication network performance, the shortage of spectrum resources has become the key to limit wireless communication performance. At present, the cellular network is the main wireless comm...

Claims

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Application Information

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IPC IPC(8): H04W48/16H04W84/18H04L27/26
CPCH04W8/005H04W40/24H04W8/00H04W40/246H04W56/004H04W76/14Y02D30/70H04L5/003H04L27/2601H04B17/16
Inventor 周晗冯淑兰
Owner HUAWEI TECH CO LTD
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