Interference sensing cross-layer routing method based on node sending and receiving capacity

Abstract

The invention relates to an interference sensing cross-layer routing method based on node sending and receiving capacity. The method defines parameters for judging the sending and receiving capacity of a node based on an 802.11 medium access control (MAC) layer, and the two parameters can reflect that strength and weakness of interference of the periphery of the node and communication load degree born by the node, based on the fact, a MAC layer and a network layer are combined and a new routing criterion is defined, the new criterion is related to the number of surrounding active neighbor nodes, the number of data flow passing the nodes, capacity of node access channel and topology changing conditions around the nodes, and real conditions of the network can be further reflected. The interference sensing cross-layer routing method based on the node sending and receiving capacity aims to reduce interference, selects a path which is largest in bottleneck node comprehensive capacity or a path which is smallest in bottleneck link interference as far as possible, and the path which is largest in the bottleneck node comprehensive capacity or the path which is smallest in the bottleneck link interference is used as routing, and therefore average end-to-end delay and packet loss probability are reduced, and the throughput is improved.

Description

technical field [0001] The invention relates to a realization scheme especially for cross-layer routing in a mobile AdHoc network, which belongs to the technical field of communication. Background technique [0002] Mobile AdHoc Networks (MANETs) is a self-organized multi-hop wireless network without a center, and nodes can freely enter or leave the network as hosts and routers. However, due to the arbitrary mobility of nodes, the network topology changes frequently and is often unpredictable. So how to choose the route to reach the destination node has become an important and core problem of AdHoc network. Due to the unique characteristics of MANETs, ​​the cross-layer design of routing protocols has become an irresistible trend. The main idea of ​​cross-layer design is to use the correlation of each layer to increase the vertical communication between layers and reduce the horizontal communication between nodes. Reduce resource waste and improve network performance. [0...

AI Technical Summary

Problems solved by technology

There will be two problems: ① For a node in the network, not all neighbor nodes will interfere with it, only the working nodes selected as routes to forward and receive packets will interfere with it

② Nodes must periodically send HELLO broadcast packets in order to fully count the information of neighbor nodes, which not only increases the workload of nodes, but more seriously, the performance of the network will also be greatly reduced due to the periodic sending of broadcast packets

There are also two problems: ① Defining the ability of a node to access the channel from the perspective of the number of retransmissions at the MAC layer cannot effectively reflect the real situation. The parameter that can directly reflect the ability of the MAC layer to access the channel is the network allocation vector NAV ((Network Allocation Vector), because NAV indicates the duration that the channel is in a busy state. During this period, the node cannot send information. In other words, the node cannot access the channel during this period. In a certain period of time The larger the value of the inner NAV, the less likely the node is to access the channel during this period

② Only the sending ability of the node is considered and the receiving ability of the node is ignored. Even if the node has a strong sending ability, if the receiving ability is poor, the packet will not be received and forwarded in time, which will eventually affect the performance of the network

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