Intelligent cooperative retransmission method, device and system thereof in wireless ad hoc network

Abstract

The invention discloses an intelligent cooperative retransmission method in a wireless ad hoc network and equipment and a system thereof. A destination node used in the wireless ad hoc network requests to retransmit a data packet to a source node through a cooperative retransmission node, the destination node judges the reason of the data packet error according to the received data packet from thesource node, and selects a cooperative retransmission mode if the reason of the data packet error is the error caused by a channel condition between the source node and the destination node; if not,a source node retransmission mode is selected; and a retransmission mode trigger frame is formed according to the selected retransmission mode, and the retransmission mode trigger frame is sent out. According to the invention, the correct receiving probability of data retransmission can be improved, the reliability of data transmission can also be improved, and the time delay of data transmissionis effectively reduced.

Description

technical field [0001] The invention relates to an intelligent cooperative retransmission method in a wireless ad hoc network, and also relates to an intelligent cooperative retransmission device and system in a wireless ad hoc network, belonging to the technical field of wireless communication. Background technique [0002] At present, for data packet retransmission in the wireless ad hoc network, some people have proposed the technical idea of ​​cooperative retransmission, specifically the following three methods. [0003] The first method is that when the destination node requests retransmission using NACK information, the neighbor node of the direct link detects packet exchange, and retransmits the data packet when a data packet reception error occurs (NACK is detected). This method does not take into account the cause of packet transmission errors. If the data packet reception error is not caused by the poor channel quality of the direct link between the source node an...

AI Technical Summary

Problems solved by technology

In this way, each node may send data packets with a large power (in fact, such a large power is not needed), resulting in an increase in power consumption of the node

(2) Assume that the channel state information from the destination node to the cooperative retransmission node is the same as the channel from the cooperative retransmission node to the destination node, without considering the consistency of the RF channel

However, in fact, in wireless ad hoc networks, the inconsistency of RF channels is more serious than in cellular networks, so this method is difficult to achieve coherent combining at the receiving end, and it is difficult to guarantee the gain of cooperative retransmission of multiple nodes

Images