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Method for realizing MAC (Media Access Control) protocol under long delay condition of underwater sound sensor network

An underwater acoustic sensor and protocol implementation technology, applied in the direction of error prevention/detection, electrical components, wireless communication, etc. using return channels, can solve the problems of reducing network throughput, increasing end-to-end delay, wasting time slots, etc. The effects of improved utilization and network throughput, lower end-to-end latency, better realizability

Inactive Publication Date: 2013-05-08
SOUTHEAST UNIV
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  • Application Information

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Problems solved by technology

[0003] Network throughput and end-to-end delay are the basic technical indicators that reflect network performance. When the traditional TDMA MAC protocol has a low network load, some nodes may have no data to send during their time slots, while other nodes cannot. The use of this time slot leads to waste of time slots, reduces network throughput, and increases end-to-end delay, because the spatial multiplexing of the channel is ignored

Method used

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  • Method for realizing MAC (Media Access Control) protocol under long delay condition of underwater sound sensor network
  • Method for realizing MAC (Media Access Control) protocol under long delay condition of underwater sound sensor network
  • Method for realizing MAC (Media Access Control) protocol under long delay condition of underwater sound sensor network

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Embodiment 1

[0055] Such as figure 1 Shown, concrete flow process of the present invention is as follows:

[0056] 1. The network is initialized, and the network topology information is established.

[0057] 2. The node judges the ownership of the time slot, and proceeds to the next step according to whether the time slot belongs to itself.

[0058] 3. If the incoming time slot is its own main time slot, and there is no data to send, listen to the CRTS frame, if the handshake is successful, then receive the data,

[0059] 4. If the incoming time slot is its main time slot and there is data to be sent, the node sends a PRTS frame to the destination node at the beginning of the PRTS section of the time slot. Other nodes that receive the PRTS frame of this node, judge whether the destination address in the PRTS frame is itself, if it is itself, then reply the PCTS frame at the beginning of the PCTS segment,

[0060] 5. If the node receives the PCTS frame replied by the destination node, th...

Embodiment 2

[0073] against Figure 5 The network topology shown, the simulation parameters are: signal propagation speed C 1500 m / s , the communication range of the node Range 1500 m , the data rate of the network D 1000 bit / s , data frame length L D 1024 bits , RTS and CTS frame length L C 88 bits , the response frame length =104 bits , the preset threshold of the counter is 5, the channel error rate is 0.003, and the buffer queue size of the MAC layer is 256000 bits , the simulation time is 7 h . The frame length is 11.3 s , where the durations of the PRTS segment, PCTS segment, CRTS segment, CCTS segment, data segment, and response segment are: 1.1 s , 1.1 s , twenty one s , 1.1 s , 4.6 s , 1.3 s . The packet generation time interval of the simulated transaction flow is a fixed value, a total of 37 groups of transaction flows are simulated, and the arrival time interval is 5 s ,6 s , 7 s ,8 s ,9 s , 10 s , 15 s , 20 s , 25 s ...

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Abstract

The invention discloses a method for realizing an MAC (Media Access Control) protocol under the long delay condition of an underwater sound sensor network. In the method, time is divided according to a time slot in a half-duplex communication mode based on a TDMA (Time Division Multiple Access) mechanism. According to the long propagation time delay characteristic of underwater sound communication and the space reusability of a channel, a node is allowed to transmit data to a node waiting for an answer acknowledgement frame, idle nodes in surrounding nodes are allowed to transmit data, and any node waiting for the answer acknowledgement frame is allowed to receive data. Due to the adoption of the method, the aim of making one node communicate with a plurality of nodes synchronously is fulfilled, the network throughput is increased, and meanwhile, the end-to-end delay of the network is lowered; and the method is suitable for the underwater sound sensor network and other long-propagation-time-delay communication networks, and has a higher practical application value.

Description

technical field [0001] The invention relates to a method for realizing a MAC layer protocol of an underwater acoustic sensor network based on CSMA / CA and TDMA, and belongs to the technical field of underwater acoustic signal processing. Background technique [0002] TDMA (Time Division Multiple Access) divides time into periodic frames, and each frame is divided into several time slots for sending signals. Under the conditions of timing and synchronization, the base station sends to The signals of multiple mobile terminals are arranged to be transmitted in predetermined time slots in order, and each mobile terminal can distinguish and receive the signal sent to it in the combined signal as long as it receives in the designated time slot. [0003] Network throughput and end-to-end delay are the basic technical indicators that reflect network performance. When the traditional TDMA MAC protocol has a low network load, some nodes may have no data to send during their time slots,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18H04L1/16H04W74/08
Inventor 高翔方世良李启玲王伟娜
Owner SOUTHEAST UNIV
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