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Method for expanding capacity of Ad Hoc network through mitigating interference using multiple antennas MAC (MIMO-MAC) optimization

A technology of network capacity and signal packets, applied in the field of wireless communication network, can solve the problem of impossible number of antennas installed on nodes, etc., achieve the effect of solving the problem of hidden nodes, shortening the interaction time, and improving the network capacity

Inactive Publication Date: 2011-07-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in actual situations, due to cost and process issues, it is impossible to install a large number of antennas on nodes

Method used

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  • Method for expanding capacity of Ad Hoc network through mitigating interference using multiple antennas MAC (MIMO-MAC) optimization

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Embodiment 1

[0044] Such as figure 1 The Ad Hoc network shown: there are four nodes in the network, the first node transmits data to the second node, and the third node transmits data to the fourth node. Assuming that each node is equipped with four antennas, the first node, the second node, and the third node are all within the mutual carrier monitoring range, and the third node can monitor the fourth node, but neither the first node nor the second node can The fourth node is monitored, so the fourth node is a hidden node to the first node and the second node.

[0045] Each MAC data frame includes four phases: RTS competition phase, CTS transmission phase, DATA transmission phase and ACK transmission phase. Assuming that the RTS competition phase contains two contention time slots, and each contention time slot contains five backoff time slots, the structure of the MAC data frame is as follows figure 2 shown.

[0046] In the first step, in the RTS competition stage, the first node and...

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Abstract

The invention discloses a method for expanding capacity of Ad Hoc network through mitigating interference using multiple antennas MAC (MIMO-MAC) optimization. The method comprises the following step that: each node is provided with a plurality of antennas, and the number of the antennas on each node is the same. Data frames of the MAC layer are synchronized and have four stages: namely a request to send (RTS) competing stage, a clear to send (CTS) emitting stage, a data (DATA) emitting stage and an acknowledgement (ACK) emitting stage, which are closely associated and cannot be separated. RTS signal packets in the method are emitted in a competition manner and CTS signal packets are synchronously emitted so as to shorten interactive time for RTS and CTS. The number of the data packets which can be emitted by each node is derived by a method for bilaterally allocating the data packets, so the problem of node hiding is solved and the capacity of the network is greatly expanded.

Description

technical field [0001] The invention relates to wireless communication network technology, in particular to a method for optimizing and improving Ad Hoc network capacity by MIMO-MAC. Background technique [0002] Ad Hoc network is a self-organizing communication system, and the communication between nodes does not need the help of infrastructure, so it can be quickly installed and deployed in emergencies, disaster relief and military affairs. Traditionally, the MAC protocol of the Ad Hoc network is generally based on the 802.11 DCF protocol. When the node transmits the RTS signal packet, it needs to monitor the channel. If the channel is busy, it chooses to back off; if the channel is idle, it transmits the RTS signal packet. After the receiving node successfully receives the RTS signal packet, the receiving node sends a CTS signal packet to respond, and completes the RTS / CTS handshake process. When the transmitting node successfully receives the CTS signal packet, it indic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08H04L1/16
Inventor 季飞卢伟山
Owner SOUTH CHINA UNIV OF TECH
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