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A v2v multi-hop warning broadcast method in vanets

A forwarding node, neighbor node technology, applied in broadcast service distribution, network topology, network traffic/resource management, etc., can solve the problem that multi-hop broadcast cannot adapt to multiple traffic environments at the same time, achieve good coverage, improve efficiency, The effect of reducing information redundancy

Active Publication Date: 2020-07-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing multi-hop broadcasting cannot adapt to the various traffic environments of cities and suburbs at the same time, and propose a V2V multi-hop warning broadcasting method in VANETs

Method used

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  • A v2v multi-hop warning broadcast method in vanets
  • A v2v multi-hop warning broadcast method in vanets
  • A v2v multi-hop warning broadcast method in vanets

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specific Embodiment approach 1

[0024] Specific implementation mode one: the specific process of the V2V multi-hop warning broadcasting method in a kind of VANETs of the present implementation mode is:

[0025] Theoretical Research and Demonstration of Grouping Problems

[0026] The present invention proposes a safety information broadcast protocol based on area adaptive grouping (Self-Adaption Area-Grouping Based Broadcast Protocol of Safety Message, SABP). In VANETs, ​​due to the complex and changeable environment around the vehicle nodes, there is a very big difference between the urban environment and the suburban environment, so it is a very important issue to design a unified broadcast protocol that can be applied to various environments. The problem of lack of flexibility in the proposed regular triangle model and regular hexagonal model, a planar region segmentation method that can dynamically change the grouping rules according to the distribution of the neighbor nodes of the current relay node is p...

specific Embodiment approach 2

[0089] Specific embodiment two: the difference between this embodiment and specific embodiment one is: SABP in the step one, in the neighbor list, determines the Nth forwarding node of the accident vehicle broadcast according to the position of the neighbor node in the communication area; (the first The second broadcast is the broadcast sent by the node where the accident occurred) If the neighbor node is in the convex hull point set, execute step 2; otherwise, execute step 4; the specific process is:

[0090] The neighbor list includes the ID number of the neighbor's vehicle, latitude and longitude coordinates, vehicle speed and driving direction;

[0091] SABP is a safety information broadcast protocol based on area adaptive grouping (Self-Adaption Area-Grouping Based Broadcast Protocol of Safety Message, SABP)

[0092] SABP uses the hello packet to maintain the neighbor list. The hello packet contains the Hello field, Position field, Direction field, Hop field, SID field, M...

specific Embodiment approach 3

[0096]Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that: the decentralized processing of the convex hull point set is carried out to obtain forwarding nodes; the specific process is:

[0097] 1). Scan the nodes in the convex-hull point set in order of polar angle from small to large. For each node A in the convex-hull point set, if the distance between the next (adjacent) node B and A is greater than or equal to 10m, then the The scanning pointer points to node B; if the distance between node B and A is less than 10m, put A and B into a group G, and set the coordinates of group G to the center coordinates of the smallest circle that can contain nodes A and B , the scanning pointer position points to group G;

[0098] 2). Judging the next (adjacent) node C of group G, if the distance between node C and group G is greater than or equal to 10m, the scanning pointer points to C; if the distance between node C and group G is less than 10m, then add ...

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Abstract

The invention relates to a V2V multi-hop warning broadcasting method for VANETs, aiming to solve the problem that the existing multi-hop broadcasting cannot simultaneously adapt to a variety of urban and suburban traffic environments. The specific process of the method comprises the following steps: I, determining the Nth forwarding node broadcast by an accident vehicle; if a neighbor node exists in a convex hull point set, executing step II; and otherwise, executing step IV; II, determining the (N+1)th forwarding node broadcast by the accident vehicle by taking the determined forwarding node as a source node; III, iterating the steps I and II to determine the (N+i)th forwarding node broadcast by the accident vehicle, and stopping broadcasting at the neighbor node in the convex hull point set until the convex hull point set is an empty set; and IV, obtaining the (N+j)th forwarding node, and stopping broadcasting at the neighbor node in the convex hull point set until the convex hull point set is the empty set. The V2V multi-hop warning broadcasting method disclosed by the invention is applied to the field of multi-hop warning broadcasting for VANETs.

Description

technical field [0001] The invention relates to a V2V multi-hop warning broadcast method in VANETs. Background technique [0002] Multi-hop broadcast technology provides a variety of information sharing services for VANETs including emergency warning and traffic information services. In order to maximize the propagation of emergency information along roads and in relevant areas, multi-hop broadcasting has become the core technology for providing such services in vehicular networks. However, multi-hop broadcasts are often affected by competition and interference. If the relay node chooses an inappropriate multi-hop broadcast, the number and times of replay hops will increase, which will lead to information redundancy and packet collision. Contention occurs when accessing the MAC layer, and broadcast storms occur. There are several existing solutions to mitigate the broadcast storm problem. However, such a scheme is not fully suitable for solving the broadcast storm problem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/06H04W28/04H04W40/20H04W40/22H04W40/24H04W84/06
CPCH04W4/06H04W40/20H04W40/22H04W40/246H04W74/085H04W84/06
Inventor 王秀峰崔刚王春萌胡启罡乌尔石磊曲明成鄢俊杨青
Owner HARBIN INST OF TECH
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