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Synchronization method and apparatus

A technology for synchronizing sequences and sequences, applied in the field of communication, can solve the problem of inability to meet the needs of time synchronization, and achieve the effect of frequency synchronization

Active Publication Date: 2022-07-29
HUAWEI TECH CO LTD
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  • Claims
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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

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  • Synchronization method and apparatus
  • Synchronization method and apparatus

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Embodiment Construction

[0114] According to the solution in the background art, if user equipment (UE) is synchronized according to the above-mentioned downlink synchronization signal sent by the base station, the time synchronization requirement between two UEs in the IoV system cannot be met.

[0115] In the communication technology of the 802.11 series, a preamble sequence consisting of 12 identical short sequences and 2 long sequences is transmitted at the beginning of each data transmission for automatic gain control (AGC), time-frequency Synchronization and channel estimation. The total time-domain length of the 12 short sequences is 3 Orthogonal Frequency Division Multiplexing (OFDM) symbols without Cyclic Prefix (CP), and the total time-domain length of the 2 long sequences is 2 OFDM symbols without CP.

[0116] However, the communication technology of the 802.11 series is based on the communication technology of the asynchronous system, and each transmission needs to perform time-frequency ...

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Abstract

The present application provides a synchronization method and apparatus. The method can be applied to intelligent transportation technologies such as Internet of Vehicles, automatic driving, and vehicle-road coordination. The method includes: the first UE maps the data to be transmitted and the first sequence on the symbols in the first time unit to obtain the first signal. The first sequence is mapped on at least one symbol in the first time unit that is not at the start position, and the first UE sends the first signal to the second UE. The second UE receives the first signal, acquires a first sequence, and synchronizes the first signal according to the first sequence. By sending a first sequence for synchronization on the symbols of the non-starting part of each data transmission, when the CP length of the symbols for sending data cannot meet the time synchronization requirement, the receiving end device can still use the first sequence to pair The data received this time realizes time synchronization, and at the same time, the CP structure is used for frequency offset estimation to realize frequency synchronization.

Description

technical field [0001] The present application relates to communication technologies, and in particular, to a synchronization method and apparatus. 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 and improves the efficiency of traffic through the communication between vehicles, traffic facilities and pedestrians. In order to ensure safe driving of vehicles, user equipment (user equipment, UE) in the Internet of Vehicles system needs to exchange status information periodically, which is called Periodic Status Message (PSM). The service period of the PSM can be changed according to the motion state of the vehicle, and the service period of the UE in different motion states is between [100ms, 1000ms]. [0003] In the Internet of Vehicles system, when two UEs exchange data, in order for the receiving UE to receive the dat...

Claims

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Application Information

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Patent Type & Authority Patents(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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