Synchronization method and apparatus

A technology of synchronous sequence and sequence, which is applied in the field of communication and can solve problems such as the inability to meet the needs of time synchronization

Active Publication Date: 2019-03-01
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present application provides a synchronization method and device, which are used to solve the problem that the above-mentioned synchronization method cannot meet the time synchronization requirements between two UEs in the Internet of Vehicles system

Method used

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  • Synchronization method and apparatus

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Embodiment Construction

[0114] According to the solution in the background art, if user equipments (user equipment, UEs) are synchronized according to the above-mentioned downlink synchronization signal issued by the base station, the requirement of time synchronization between two UEs in the Internet of Vehicles system cannot be met.

[0115] In the 802.11 series of communication technologies, the initial part of each data transmission will transmit a preamble sequence consisting of 12 identical short sequences and 2 long sequences for automatic gain control (Automatic Gain Control, AGC), time-frequency Synchronization and channel estimation. The total length of the 12 short sequences in the time domain is 3 Orthogonal Frequency Division Multiplexing (OFDM) symbols without a cyclic prefix (Cyclic Prefix, CP), and the total length of the 2 long sequences in the time domain is 2 OFDM symbols without CP.

[0116] However, the communication technology of the 802.11 series is based on the communication ...

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Abstract

The invention provides a synchronization method and apparatus. The method comprises the following steps: first UE maps data to be transmitted and a first sequence onto symbols in a first time unit toobtain a first signal. The first sequence is mapped onto at least one symbol of a non-starting location in the first time unit, and the first UE sends the first signal to second UE. The second UE receives the first signal, obtains a first sequence, and synchronizes the first signal according to the first sequence. By transmitting the first sequence for synchronization on the symbols of the non-starting portion of each data transmission, when the CP length of the symbol for sending the data cannot meet the time synchronization requirement, a receiving end device can still use the first sequenceto perform time synchronization on the currently received data, and meanwhile use a CP structure to perform frequency offset estimation to achieve frequency synchronization.

Description

technical field [0001] The present application relates to communication technologies, and in particular to a synchronization method and device. Background technique [0002] In recent years, the Internet of Vehicles technology has attracted more and more attention. The Internet of Vehicles system improves the safety and reliability of road traffic through communication between vehicles, traffic facilities, and pedestrians, and improves traffic efficiency. In order to ensure the safe driving of the vehicle, the user equipment (user equipment, UE) in the Internet of Vehicles system needs to periodically exchange status information, which is called periodic status message (Periodic Status Message, PSM). The service period of the PSM can change according to the movement state of the vehicle, and the service period of the UE in different movement states takes a value between [100ms, 1000ms]. [0003] In the Internet of Vehicles system, when data is exchanged between two UEs, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L27/00H04L27/26H04W56/00
CPCH04L5/0083H04L27/0014H04L27/2662H04L27/2666H04L27/2672H04W56/00H04W56/0035H04L2027/0026H04L5/0007H04L5/0048H04W56/001H04W72/044H04W72/51
Inventor 高磊刘德平鲁振伟
Owner HUAWEI TECH CO LTD
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