Method and device for resource allocation in vehicle networking system
A resource allocation and Internet of Vehicles technology, applied in the field of Internet of Vehicles communication, can solve the problems of consuming large communication resources, large system overhead, heavy load of LTE base stations, etc., to achieve the effect of avoiding communication resources and ensuring reliability
Active Publication Date: 2019-11-29
INST OF COMPUTING TECH CHINESE ACAD OF SCI
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Problems solved by technology
[0006] However, this centralized access architecture requires all vehicles to be connected to the LTE cell, making the LTE base station heavily loaded
And because of the frequent information interaction between the vehicle and the base station, it needs to consume a lot of communication resources
In addition, due to the high dynamics of the vehicle, the vehicle will frequently switch between cells, and the system overhead is very high
Method used
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[0060] The method of the present invention is specifically described below through examples.
[0061] 1. Make decisions based on traffic density.
[0062] As mentioned above, in order to make a decision, the system needs to obtain the traffic flow density, and can specify the decision in a targeted manner by obtaining the traffic flow density in different time periods. How to generate the decision according to the present invention according to the traffic density will be explained in detail below.
[0063] Assume that the total traffic density of each lane on a highway is λ (that is, there are λ vehicles per meter on all lanes), and the data packet size of the heartbeat information of vehicle-to-vehicle communication is no more than B p byte, the frequency at which the vehicle generates new heartbeat information packets is fHz, (for example, if f=10Hz, the period for the vehicle to generate heartbeat information is 1 / f=100ms), and the transmission distance of the heartbeat i...
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The present invention provides a method and system for resource allocation in a vehicle networking system. The method includes: 1) determining the data transmission rate and the number of time slots used by vehicles within a specified range for sending heartbeat information; 2) broadcasting the data transmission rate and the number of time slots to the vehicle within the specified range 3) The vehicle randomly selects a number of time slots equal to the number of time slots from all available time slots, so as to send the heartbeat information of the vehicle at the information transmission rate on the selected time slots. In the present invention, the base station does not need to allocate resources for each vehicle, and the vehicle can randomly select time slot resources for information transmission, so there is no need for frequent information interaction between the vehicle and the base station, avoiding the consumption of a large amount of communication resources.
Description
technical field [0001] The present invention relates to wireless communication, in particular to vehicle networking communication. Background technique [0002] The Internet of Vehicles is an important part of the intelligent transportation system. Through the communication between vehicles, the driver can timely and accurately understand the running speed and status of other vehicles outside the field of vision, so as to provide guarantee for safe driving. [0003] Currently, the Internet of Vehicles uses a short-distance communication protocol (DSRC protocol, also known as 802.11p protocol). In this protocol, vehicles compete for channels competitively through the CSMA / CA carrier sense interference avoidance mechanism. In other words, vehicles compete to use the channel by listening to the channel for idle or busy conditions. When the vehicle detects that the channel is idle, the vehicle obtains the channel credit right, and sends its current location information to the s...
Claims
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IPC IPC(8): H04W72/04H04L29/08
CPCH04L67/12H04W72/0446H04W72/52H04W72/53H04W72/20
Inventor 刘航周一青田霖石晶林
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI