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Construction method of discovery signal used for realizing equipment discovery, detection method and corresponding apparatus

A technology for discovering signals and devices, which is applied in the directions of multiple use of transmission paths, digital transmission systems, electrical components, etc., and can solve problems such as quantization errors and clipping distortions

Active Publication Date: 2015-09-23
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the AGC module should work correctly to adjust the received signal power within a target range to facilitate subsequent quantization operations performed by the AGC, otherwise, serious quantization errors or clipping distortions will result

Method used

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  • Construction method of discovery signal used for realizing equipment discovery, detection method and corresponding apparatus
  • Construction method of discovery signal used for realizing equipment discovery, detection method and corresponding apparatus
  • Construction method of discovery signal used for realizing equipment discovery, detection method and corresponding apparatus

Examples

Experimental program
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Effect test

Embodiment 1

[0072] Embodiment 1: Generating a discovery signal with a first structure

[0073] The construction of the half-length data / control symbols following the discovery of the preamble is first introduced.

[0074] According to the first structure, it is found that the preamble does not contain control information, but the half-length data / control symbols following it can be used to transmit some data or control information. Where a half-length data / control symbol is used to convey data information, the data contained in that half-symbol, together with the data contained in the subsequent data symbol, constitutes the total discovery message data. In case half-length data / control symbols are used to convey control information, the half-length data / control symbols contain control information which can be used for detection of discovery messages. In this case, the discovery message is only included in symbols following the first symbol.

[0075] To form a half-length data / control ...

Embodiment 2

[0090] Example 2: Generating a discovery signal with a second structure

[0091] In this implementation, the discovery preamble is designed to convey certain control information (eg, DMRS / scrambling sequence index, or other transmission parameters) for detection of subsequent discovery messages. Similar to Embodiment 1, the first SC-FDMA symbol in the discovery subframe is divided into two parts, one is the discovery preamble, and the other is the half-length data / control symbol. Different from the first structure, according to the second structure, both parts have a clear CP, such as Figure 6 shown.

[0092] In this embodiment, a specific preamble sequence is transmitted by the discovery preamble, namely Figure 4 The first symbol vector in step 402 of . The preamble sequence is loaded in the frequency domain and occupies every other subcarrier in the PRB used by the discovery signal. Therefore, a repetitive structure is generated in the time domain. Discovery preambl...

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Abstract

Embodiments of the invention provide a construction method of a discovery signal possessing a discovery lead, a detection method and a corresponding apparatus. The construction method of the discovery signal comprises the following steps that a first symbol in a discovery subframe is divided into a first portion and a second portion; each symbol in a first symbol vector is mapped to a corresponding subcarrier in a plurality of equally-spaced subcarriers on a frequency resource used for transmitting a discovery message respectively, and zero setting is performed on other subcarriers so as to obtain a first zero fill symbol vector whose length is equal to a total amount of the subcarriers on the frequency resource; inverse discrete Fourier transform IDFT is performed on the first zero fill symbol vector so as to generate a second symbol vector formed by two repetition portions; one repetition portion is taken out from the second symbol vector, and a cyclic prefix CP is added and is mapped to the first portion so as to be served as eh discovery lead. In some embodiments, the second portion obtained by dividing the first symbol can be used for transmitting data or controlling information.

Description

technical field [0001] Embodiments of the present invention relate to device discovery in wireless communication, and more specifically, to a method for constructing and detecting a discovery signal for realizing device discovery in device-to-device communication and corresponding devices. Background technique [0002] The 3rd Generation Partnership Project (3GPP) introduced the Long Term Evolution (LTE) wireless communication standard in the R8 release. LTE is a technology for mobile data transmission whose objectives include increasing data transmission rates and reducing latency. Its updated version LTE-Advanced (LTE-A) was introduced in 3GPP R10 release to meet the requirements for the fourth generation wireless communication system. [0003] During the continuous evolution of the LTE-A standard, the concept of device-to-device (D2D) communication is proposed. An example of this concept is given in 3GPP document RP-110706, "On the need for a3GPP study on LTE device-to-...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L5/00
Inventor 李栋龚朝华蔡立羽
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD