Fast precontract and line transmission multi-address access method

Abstract

The present invention relates to a method for fast reservation multiple access, including: a central control node sets the number of contention time slots according to the number of nodes that have successfully accessed at present and idle channel resources; Announce the start of the reservation on the channel, followed by the number of competition time slots; the node makes a competition reservation on the first channel, and turns to the second channel to listen to the result; the central control node receives the access reservation on the first channel, At the same time, the access result is published on the second channel, and channel resources are allocated to nodes that have successfully accessed; each node sends service packets sequentially on the allocated channel resources without conflict. The present invention effectively eliminates the adverse effect of signal propagation delay on channel throughput, reduces the problem of hidden terminals and exposed terminals in reservation, and eliminates the possibility of collision in business packet transmission, and is especially suitable for communication with large propagation delay Access on the link uses the multiple access method of the channel.

Description

technical field [0001] The invention relates to a multiple access method for multiple nodes to share wireless channel resources, in particular to a fast reservation train multiple access method. Background technique [0002] The multiple access (Medium Access Control, MAC for short) method solves the problem of how multiple nodes or users share channel resources quickly, efficiently, fairly, and reliably. According to the channel allocation method, multiple access methods are usually divided into There are three ways of fixed allocation, random access and on-demand allocation. [0003] The fixed-allocation multiple access method generally allocates channel resources to some nodes or all nodes that share the channel for a long time. Since there are a large number of mobile nodes in various mobile communication networks, and the business of each node is mostly bursty business, the multiple access method of fixed allocation will cause a lot of channel resources to be idle and ...

AI Technical Summary

Problems solved by technology

However, the method based on random competition still has the problem of packet collision in the application reservation part, and the influence of hidden terminals is only weakened, not eliminated

Although the collision-free method can avoid packet collisions, when many nodes do not send, this method will waste a lot of polling control overhead

[0006] In addition, there are still problems in the on-demand allocation multiple access method proposed in the prior art. For example, when the network traffic is low, compared with the random access method, the on-demand allocation method has a large proportion of control overhead. , the problem of large transmission delay

As another example, when the network traffic is high, compared with the fixed allocation method, the on-demand allocation method has problems such as insufficient maximum channel throughput and inability to guarantee the fairness of the shared channel.

[0007] In addition, the above-mentioned various multiple access methods, especially the multiple access methods based on demand allocation, do not fully consider the impact of signal propagation delay on multiple access performance

In practical applications, aviation communication networks, satellite communication networks, and deep space communication networks all have long signal propagation delays. When performing various control packet handshakes and status information exchanges, excessively long signal propagation delays will greatly degrade multiple access performance

Images