Access method of relay network

Abstract

The invention provides an access method of a relay network, which comprises the following steps of monitoring a channel by a source node until the channel is idle and the source node needs to send information, judging a flag bit and forwarding the information without entering an MAC (Media Access Control) layer for processing; carrying out different unicast and broadcast according to the information sent by the source node of the unmanned aerial vehicle relay, and when the receiving node receives the information forwarded by the unmanned aerial vehicle, judging the destination address field of the MAC frame header, so that the forwarded information is received or discarded. According to the invention, by checking the flag bit, unnecessary forwarding can be avoided, the forwarding time delay is reduced, the throughput of the system is improved, and a corresponding response mechanism can be adopted more accurately. Compared with the mode that all information is broadcasted and relayed through the unmanned aerial vehicle, only important information is broadcasted, so that the energy consumption of the destination node can be reduced, and judgment and response can be made more easily.

Description

technical field [0001] The invention relates to the technical field of communication networking, in particular to a network access method, in particular to a protocol design method in a relay system where environmental conditions are unfavorable for people to directly monitor information, thereby performing data collection and forwarding. Background technique [0002] Since the unmanned aerial vehicle (UAV) relay network system is easy to deploy and easy to expand network coverage, it has been widely researched and applied. Usually, this kind of network system is called UAV-Relay Network System (URNS), which consists of one UAV and multiple ground nodes. The UAV hovers or rotates in the air and relays a data frame from the source node to the destination node. [0003] At present, most URNS use the carrier sense protocol (CSMA / CA) with collision avoidance function, which needs to use the data link layer (MAC), which will undoubtedly increase the forwarding delay and reduce t...

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Problems solved by technology

[0003] At present, most URNS use the carrier sense protocol (CSMA / CA) with collision avoidance function, which needs to use the data link layer (MAC), which will undoubtedly increase the forwarding delay and reduce the throughput. First, UAV does not have Distinguish whether a node needs to forward or not. By default, all forwards are forwarded. These unnecessary forwards may interfere with other transmissions and cause performance degradation

Secondly, in the UAV relay system, it is generally the point-to-point transmission from the source node to the destination node through the UAV relay, and there is no different transmission mode for the source node due to the difference in information. For some special scenarios, The information of individual nodes is more important, and all receiving nodes need to receive this information. At the same time, the receiving nodes need this information and their fixed receiving information to make joint judgments, otherwise the receiving nodes cannot make an accurate response mechanism

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