TDMA based long propagation delay wireless link time slot distribution method

Abstract

The invention discloses a TDMA based long propagation delay wireless link time slot distribution method which is mainly used for solving the problem of low throughput rate and low channel utilization rate of an existing long propagation delay wireless ad hoc network. The implementation scheme comprises the steps of 1, initializing a node; 2, judging whether the node receives a synchronous frame, if so, carrying out network access synchronization by the node, and otherwise, building a network by regarding the local clock as a reference by the node; 3, after synchronization is finished, generating a super-frame structure automatically by the node, and dividing the local time into multiple time slots with different functions; and 4, judging whether the current time slot is a service time slot by the node, if so, sending and receiving data, and otherwise, updating network information. as the TDMA is adopted as a channel access mode, the node can access the channel without any conflict; and through an interactive sending mechanism and a data frame queue scheduling mechanism, the network throughput rate and the channel utilization rate are increased, the queuing delay of the data frames is reduced; and the TDMA based long propagation delay wireless link time slot distribution method can be used for a time division multiple access ad hoc network.

Description

technical field [0001] The invention relates to the technical field of communication, and further relates to a time slot allocation method, which can be used in time division multiple access TDMA ad hoc networks. Background technique [0002] The traditional time slot allocation method is to allocate several time slots in a frame to a certain node in the network, and the node sends data in these time slots and receives data in the remaining time slots. In the case of wireless links with long propagation delays, such as the inter-satellite link of the satellite self-organizing network, the TDMA protocol needs to set the guard interval of a time slot long enough to ensure that a node sends data in a certain time slot. Affects a node to send data in the next time slot, and the length of the time slot increases due to the increase of the guard interval. When the propagation delay of the wireless link is greater than the transmission delay, the guard interval will be more than h...

AI Technical Summary

Problems solved by technology

In the case of wireless links with long propagation delays, such as the inter-satellite link of the satellite self-organizing network, the TDMA protocol needs to set the guard interval of a time slot long enough to ensure that a node sends data in a certain time slot. Affects a node sending data in the next time slot, and the time slot length increases due to the increase in the guard interval

When the propagation delay of the wireless link is greater than the transmission delay, the guard interval will be more than half of the time slot. In this case, the network throughput and channel utilization are low, and the queuing delay of data frames is large. , so the existing TDMA protocol cannot meet the ad hoc network with high traffic demand, and at the same time, the real-time performance of the protocol is poor due to the long time slot

[0003] At present, in the satellite self-organizing network, most of the MAC protocols used between satellites are based on the CSMA / CA mechanism of IEEE 802.11. Under this mechanism, there are also problems of low network throughput and channel utilization, and access The channel time is generally long, and the queuing delay of data frames is large

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