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Safety message broadcasting method in heterogeneous network environment for safe travel

A technology for heterogeneous networks and secure messaging, applied in the field of communications, can solve problems such as increased backoff time, channel congestion, and limited channel resources, and achieve the effects of small delay, large network bandwidth, and high power.

Active Publication Date: 2016-11-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 802.11p network has good immediacy and certain bandwidth, but the channel resources are limited, especially the CCH channel related to security messages has only 10M bandwidth, and when the traffic density increases, it is easy to cause problems such as increased backoff time and channel congestion

Method used

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  • Safety message broadcasting method in heterogeneous network environment for safe travel
  • Safety message broadcasting method in heterogeneous network environment for safe travel
  • Safety message broadcasting method in heterogeneous network environment for safe travel

Examples

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Embodiment 1

[0038] A method for broadcasting safety messages in a heterogeneous network environment oriented to safe travel. In the eMBMS of the LTE system, the method divides service information into first-level traffic warning (priority 3) and second-level traffic warning according to service priority from high to low. Traffic warning (priority 2), traffic information service (priority 1) and eMBMS itself (priority 0), such as figure 1 As shown in FIG. 1 , the corresponding service information is broadcast according to the distance between the eNodeB (base station) and the location of the accident. The frequency of the first-level traffic warning is determined by the level of the first-level warning and the number and frequency of dangerous reporting vehicles per unit time. The content of the first-level traffic warning includes vehicle emergency news, unexpected traffic accidents, major traffic accidents, etc., with the highest frequency and the most timely update. The frequency of th...

Embodiment 2

[0056] When the density of vehicle nodes in the cell is high, a certain vehicle in the cell needs to broadcast a CCH emergency message. The vehicle broadcasts 802.11p data to ensure the timeliness of the broadcast within a short distance. The type broadcasts the first-level traffic warning information within the local area at a certain frequency, but the surrounding cells do not participate in eMBMS traffic safety broadcasting, and normal eMBMS services are not affected. Vehicles receiving 802.11p emergency messages within a range of 100-300 meters can broadcast and forward emergency messages at a lower frequency based on their own vehicle speed, and vehicles that receive broadcast forwarding further outside can forward emergency messages at a lower frequency or choose not to broadcast Forward. The outermost vehicles only receive emergency broadcasts from the eNodeB of the cell. In this way, problems such as channel congestion and broadcast storm caused by pure 802.11p networ...

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Abstract

The invention relates to a method for broadcasting safety information in the heterogeneous network environment for safe travel. The method is applied to the eMBMS of an LTE system. Service information is divided into a first-level traffic alarm, a second-level traffic alarm, a traffic information service and an eMBMS service from top to bottom according to the service priority. According to the distance between the eNodeB and an accident scene, the corresponding service information is broadcasted. Compared with the prior art, channel resources are reserved for vehicles needing timely 802.11 p information interaction and the package special delivery success rate is increased; in a cell where an emergency message is generated, the problems of a 802.11 p channel jam, a broadcast storm and the like are solved.

Description

technical field [0001] The invention relates to communication fields such as cellular networks and vehicle self-organizing networks, and in particular to a safety message broadcasting method in a heterogeneous network environment oriented to safe travel. Background technique [0002] In the field of third-generation mobile communication, MBMS (Multimedia Broadcast Multicast Service, Multimedia Broadcast Multicast Service) is the technology and cornerstone of mobile TV services. MBMS provides a point-to-multipoint transmission mechanism for multimedia transmission, and resource consumption has nothing to do with the increase in the number of users, thus finding a fundamental way to save the very tight air interface resources of the 3G network and avoid the disadvantage of mobile network capacity. The more users there are, the more obvious the advantages of MBMS in terms of capacity and cost will be. [0003] The high-bandwidth and low-latency features of 4G will promote the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/06
Inventor 王平刘富强王新红杨洋雷国凤张欢
Owner TONGJI UNIV
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