Method for reliably transmitting real-time service in wireless ad hoc network based on cooperation reservation

Abstract

The invention discloses a method for reliably transmitting a real-time service in a wireless ad hoc network based on cooperation reservation. The method comprises the following steps of: switching a subsequent period to a reservation mode and accessing a channel after a real-time data packet is successfully transmitted in a competition mode, and switching to the competition mode to retransmit the data packet if the real-time data packet is unsuccessfully transmitted in the reservation mode; before a node transmits a data packet or an acknowledgement packet, selecting a piece of reservation information from a reservation table and transmitting the information together with the packet, not selecting if the reservation information is absent, discriminating the carried reservation information by using the node receiving the packet, storing the information in the reservation table if the distance between the node and a reservation initiator is smaller than a cooperation threshold and the reservation information is absent in the reservation table, and neglecting the reservation information if the distance is greater than the cooperation threshold and the reservation information is present. By the method, an effective spread range of the reservation information is widened, the problem that the reservation information is lost to cause packet conflict due to path fading and packet conflict factors is solved, and the transmission reliability of the real-time reservation service in a reservation time period is improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a real-time service transmission method. Background technique [0002] The wireless self-organizing network (ad hoc network) is a wireless multi-hop network composed of a group of nodes of the same level. The entire network does not contain any central control nodes and infrastructure. Each unit node has its own wireless transceiver device, and each node relies on mutual coordination. Perform channel access and data packet transmission. This kind of network has low cost, strong invulnerability, fast networking speed and wide application fields. [0003] With the continuous development of wireless network technology, ordinary data transmission services can no longer meet people's needs for ad hoc networks, and the transmission of more services with special quality of service requirements in ad hoc networks has gradually become a research hotspot, such as multimedia...

AI Technical Summary

Problems solved by technology

Neighboring nodes located in the transmission range of the sending node can correctly receive the packets sent by it with a certain probability, and multi-step reservation improves the reservation reliability of real-time services in this area to a certain extent; The node not only cannot correctly receive the packet sent by the sending node (if the packet is a real-time packet, the reservation information in it cannot be obtained), but its own business will also cause interference to the sending node, which is impossible for both the basic reservation mechanism and the multi-step reservation mechanism. solved problem

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