Multi-hop tdma access method for UAV ad hoc network based on time slot assisted allocation and use

Abstract

The invention proposes a multi-hop TDMA access method based on time slot assisted allocation and use of the UAV ad hoc network, which includes three periods of time slot allocation—CMOP, data—Data and time slot request—SMOP during operation It adopts two new mechanisms: "one-hop node assists in allocating data time slots" and "uses idle data time slots to assist neighbor nodes in sending data frames". The first new mechanism works in the CMOP period, and the second new mechanism Work in the Data period. The one-hop node around the master node allocates conflict-free data time slots to nodes that fail to transmit time slot request messages, and nodes use their own idle data time slots to assist other nodes in transmitting previously failed data frames, thereby reducing data The average delay of frames improves network throughput and channel utilization.

Description

technical field [0001] The invention belongs to the technical field of Unmanned Aerial Vehicles Ad Hoc Networks (UANET), and in particular relates to adopting multi-hop TDMA (Time Division Multiple Access, Time Division Multiple Access) in a Medium Access Control (Medium Access Control, MAC) layer Access) UAV ad hoc network occasions with access method. Background technique [0002] With the development of aviation technology, Unmanned Aerial Vehicles (UAV) has received more and more attention and has become one of the hot research topics in recent years. A drone is an aircraft that does not need to carry any personnel, and its flight can be operated autonomously or automatically controlled by a remote onboard computer system. Compared with manned aircraft, UAVs have the characteristics of flexibility, low cost, and high mobility, and are widely used in environmental monitoring, relay networks, transportation and agricultural management, and disaster relief, as shown in Fig...

AI Technical Summary

Problems solved by technology

Due to the high-speed movement of drones and frequent topology changes, once the transmission of the time slot request message sent by the one-hop nodes around the master node fails, it will seriously affect the time slot application of multiple nodes and increase the data delay.

Therefore, there is a certain unreliability in the time slot application message of the existing multi-hop TDMA access method, which affects the delay performance of the access method. This problem needs to be solved.

[0018] 2. Since the network is a multi-hop scenario, when a node applies for a time slot, if it only considers the number of time slots required by the node itself, but does not consider the number of time slots that need to be relayed by this node, it cannot relay other data in this frame. The data sent by the node increases the data delay of other nodes

However, the ratio of the number of neighbor nodes of a node or the number of data packets that need to be relayed and forwarded by the node is predicted to determine the total number of time slots required by the node in advance, which has certain inaccuracy and may cause redundant data in some nodes. time slots, resulting in wasted time slots

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