MIMO-based topology-transparent broadcast transmission multiple access method in ad hoc network

Abstract

The invention relates to an MIMO-based (multiple input multiple output-based) topology-transparent broadcast transmission multiple access method in an ad hoc network. By modifying the time slot structure and signal flow on the basis of MIMO-TTR (multiple input multiple output-topology-transparent reservation) protocol, the broadcast transmission can be effectively supported by the MIMO-TTR protocol in the topology-transparent network. The MIMO-based topology-transparent broadcast transmission multiple access method comprises the following steps: firstly, carrying out the time slot allocation on all the nodes in the network by the GRAND (Galois radio network design) algorithm in advance, wherein, each time slot is divided into the following stages: RTS (Request to Send), NTS (Not to Send), DATA (Data Transmission) and NAK (Non-acknowledge), and the broadcast transmission services are provided by using different MIMO data stream numbers in the four stages of the time slot; and exchanging the RTS / NTS subgroups by only one data stream at each transmitting node and each receiving node in the exchanging process, if the broadcast services are required to be transmitted by the transmitting node, the RTS subgroup is transmitted to all adjacent nodes for reservation in the allocated time slot, and if the RTS subgroup is not properly received by the receiving node, the NTS subgroup is replied to the transmitting node immediately, if the NTS subgroup is received by the transmitting subgroup, that the broadcast services cannot be transmitted in the current time slot is determined, and the next allocated time slot reservation is made, and if not, that the reservation is made is determined by the transmitting node, and the broadcast subgroup is transmitted by using all the data streams.

Description

technical field [0001] The invention relates to the fields of multiple-input multiple-output (MIMO) technology and wireless multi-hop ad hoc network broadcast transmission, in particular to a topology-unknown broadcast transmission multiple access method supporting MIMO in an ad hoc network. The method is used to realize the successful transmission of the broadcast service without the topology information of the whole network, improve the capacity of the network, and at the same time realize that the performance of the network will not be greatly reduced with the change of the network. Background technique [0002] One of the main characteristics of Ad hoc Ultra 3G is an ad hoc wireless network composed of several geographically dispersed mobile nodes that does not need fixed infrastructure support. These nodes can freely enter and leave the network, and can also be in the network. Move freely. The MIMO system can be regarded as a system equipped with multiple antennas at b...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the prior art "MIMO-TTR" cannot effectively support broadcasting, while the prior art "Broadcast Transmission Time Division Multiple Access Protocol Supporting MIMO in Multi-hop ad Hoc Networks" supports broadcasting services However, it needs the deficiency of the topology information of the whole network, and proposes a multiple access protocol that supports broadcast services without the topology information of the whole network.

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