Collision Detection Method of Time Slot Resources in Vehicular Ad Hoc Networks
A vehicle ad hoc network and time slot resource technology, applied in the field of vehicle communication network, can solve problems such as unstable data transmission, untimely collision detection, and increased number of collisions, so as to improve utilization rate, improve accuracy, and reduce delay Effect
Active Publication Date: 2020-06-09
DATANG GOHIGH INTELLIGENT & CONNECTED TECH (CHONGQING) CO LTD
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The above-mentioned collision detection method for nodes occupying time slots is not suitable for vehicular ad hoc networks whose topological structure is in a dynamically changing state. Misjudgment is very easy to occur, resulting in an increase in the number of collisions, resulting in unstable data transmission; at the same time, since the transmission time of each node in the transmission time slot is exactly the same, there will be a problem that the collision detection is not timely or the judgment is missed
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0025] image 3 is the time slot description table of the present invention, Figure 4 It is a schematic diagram of the selected sending time of the present invention, as shown in the figure, in order to solve the problem of high misjudgment rate of collision detection in the vehicle ad hoc network, the present invention uses two sub-flag bits (x , y) means that when the value of (x, y) is (1, 1), it indicates that a collision has occurred, and the sensing range of the node is extended to the range of three-hop adjacent nodes; for the problem that cannot be detected due to the same sending time , the present invention improves the detection accuracy of time slot collision and reduces the missed judgment of collision by randomly selecting the sending time and combining the method of judging the receiving power. A detailed description will be ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a time slot resource collision detection method in a vehicle-mounted ad hoc network. A node randomly selects a transmission time point in a candidate time slot or a basic time slot, and judges whether collision happens or not according to the detected signal power; The node selects the transmission time point tx in the time period t1-t2 of the candidate time slot, and judges whether the time slot is occupied or not according to the signal power detected in the period t1-tx. When the signal power is greater than noise power and less than the maximum power or is greater than the maximum power, the candidate time slot is occupied, and the node reselects the candidate time. When the signal power is less than or equal to the noise power, the candidate time slot is not occupied, and the node transmits a time slot application frame at the transmission time point tx through the candidate time slot. The method reduces the judgment leakage and misjudgment rates of time slot collision detection, improves the accuracy of the time slot collision detection, and is suitable to be used in the vehicle-mounted ad hoc network with the node being in a high-speed moving state.
Description
technical field [0001] The invention relates to a collision detection method for time slot resources in a vehicular ad hoc network, belonging to the technical field of vehicular communication networks. Background technique [0002] The RR-ALOHA (Reliable Reservation ALOHA) protocol is a channel access protocol based on time slot structure and dynamic time division multiplexing. Its basic idea is that the channel is composed of periodic frames, each frame is composed of N time slots, and each time slot It can be reserved by a node. If the reservation is successful, the time slot can be used as the basic time slot of the node, and periodically send data packets in the basic time slot of each frame until it collides with other nodes or leaves the network to give up the channel. In each frame, the node listens to the data packets broadcast by other nodes within the single-hop range, and sets the flag (busy, idle) in the corresponding time slot of its frame information. In the ti...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/00H04W84/18
Inventor 赵德胜鞠秀芳路明
Owner DATANG GOHIGH INTELLIGENT & CONNECTED TECH (CHONGQING) CO LTD