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Road-vehicle cooperation-based communication method and equipment

A communication method and road-to-vehicle technology, applied in the field of intelligent transportation, can solve problems such as no specific implementation plan for handover is given.

Inactive Publication Date: 2011-11-23
BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of continuous driving, the vehicle needs to communicate with different RSUs, which involves the issue of how the vehicle switches between different RSUs. However, the 802.11p protocol does not give a specific implementation plan for switching, and in view of the 802.11 protocol The defect of the given handover scheme, the handover scheme in the 802.11 protocol directly used in 802.11p will also have the same defect

Method used

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  • Road-vehicle cooperation-based communication method and equipment
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  • Road-vehicle cooperation-based communication method and equipment

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Embodiment Construction

[0044] Before specifically introducing the method, OBU and RSU in the present invention, the following two aspects are firstly introduced.

[0045] First, the channel model in the present invention.

[0046] In IEEE802.11p, two channels are defined: control channel (CCH) and service channel (SCH). figure 1 It is a schematic diagram of the transmission power and usage of SCH and CCH in the prior art.

[0047] Such as figure 1 As shown, IEEE802.11p allocates a total bandwidth of 75MHz for CCH and SCH, from 5.850GHz to 5.925GHz, divided into 1 CCH (identified as Ch178), 6 SCHs (identified as Ch172, Ch174, Ch176, Ch180, Ch182 and Ch184) and a reserved bandwidth of 5MHz. Among them, CCH has the largest transmission power and is responsible for transmitting wireless access vehicle environment (WAVE) short message (WSM) information and control information. The transmission power of SCH is relatively small, and it is responsible for transmitting QoS data. figure 1 The SCHs mar...

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Abstract

The invention discloses a road-vehicle cooperation-based communication method and road-vehicle cooperation-based communication equipment. Based on a space model that each road side unit (RSU) comprises a service range and a control channel (CCH) range, a method for switching a service channel (SCH) and the CCH is adopted. At a CCH transmission interval, an on-board unit (OBU) can apply adjacent RSU2 for switching parameters to perform pre-switching, when switching conditions are accorded, the applied switching parameters are directly called to switch the CCH to adjacent RSU2, and the switching time delay is shortened; and at an SCH transmission interval, when OBU1 departs from the current service range of the RSU1, the RSU1 communicates with the RSU2 through vehicle-vehicle forwarding, and when OBU1 enters the service range of the adjacent RSU2, the applied switching parameters are directly called to switch the SCH to adjacent RSU2; therefore, the SCH is seamlessly switched under the condition that the service ranges of the two adjacent RSUs have no overlap area.

Description

Technical field [0001] The invention involves the field of intelligent transportation technology, which specializes in road car collaborative communication technology network, and specifically involves road car -based communication methods and equipment. Background technique [0002] The 802.11 protocol gives a typical switching process, which includes the following steps: [0003] Step 1: Workstations are connected to the current base station link. [0004] Step 2: The workstation receives the signal sent by the base station of the surrounding communities. Select the corresponding base station sending request with the corresponding signal -to -noise ratio. [0005] Step 3: Workstation and selected base station exchange certification information. [0006] Step 4: Workstation sends a re -associated request to the selected base station. [0007] Step 5: Workstation and communication pairs create new links by selecting base stations and communicate. [0008] According to the above s...

Claims

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Application Information

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IPC IPC(8): H04W36/18
Inventor 魏星徐洪刚何山罗志峰刘文海鲍东山
Owner BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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