Multiple access method applicable to QoS (Quality of Service) hard guarantee in density nonuniform state

Abstract

The invention discloses a multiple access method applicable to QoS (Quality of Service) hard guarantee in a density nonuniform state and solves the problems that in the prior art, receiving end information is not utilized and a node density and service characteristics are not considered. The multiple access method comprises implementing steps of: a packet sending process of storing data packets inservice packet sending queues with different priorities, sequentially polling to search to-be-sent data packets from high priority to low priority, calculating an overlapping degree of neighbor nodes, calculating a channel occupation statistic value according to a monitoring pulse number, comparing the statistic value with a channel access threshold and selecting random or reserved access by combining the service characteristics; and a packet receiving process of judging a data packet type from a physical layer and selecting a packet sending, backoff or abandon operation according to the datapacket type or a case whether a current node is a target node. According to the invention, a reservation mechanism is introduced, the overlapping degree and the statistic value participate in judgment on an access channel, a conflict of nonuniform network density is resolved, an access strategy is more reasonably designed, user QoS is improved, reliability is high, and the multiple access methodis applied to a mobile Ad Hoc network.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to multiple access in the technical field of network communication protocols, in particular to a multiple access method suitable for hard guarantee of service quality in a state of non-uniform density. Applied to the communication process in the Ad Hoc network. [0002] According to the characteristics of non-uniform network node density and non-uniform service characteristics, the present invention can obtain better service quality for services with different characteristics through the combined design of the transmitting and receiving ends and the combination of reservation and random access. Background technique [0003] Ad hoc network is a new type of wireless self-organizing network, which is different from the commonly used cellular network and wireless local area network. It consists of a group of mobile nodes with wireless transceivers. , Quickly set up a wirele...

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Problems solved by technology

[0006] However, the disadvantage of this method is that it does not consider the unevenness of network density caused by the mobility of nodes, resulting in a waste of network resources; it only considers the state of the channel at the sending end and does not consider the state of the channel at the receiving end. The channel status of the sender is idle, and the sender will still send data packets, resulting in packet collisions and reducing the probability of successful transmission

In the prior art, no specific calculation method for channel occupancy statistics has been proposed; no distinction is made between different service characteristics in the network, and all services use a unified random access mechanism to access channels under the premise of threshold restrictions, and there is no Differentiate the access methods of services with different characteristics

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