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Method for realizing water sound sensor network MAC (Media Access Control) protocol based on ALOHA and TDMA (Time Division Multiple Access)

A technology of underwater acoustic sensor and implementation method, applied in wireless network protocol, network topology, transmission system and other directions, can solve the problems of wasting time slot, increasing end-to-end delay, ignoring channel space reuse, etc., and achieving good achievable The effect of stability and high network performance

Inactive Publication Date: 2011-06-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Network throughput and end-to-end delay are the basic technical indicators of network performance. When the traditional TDMA protocol has a low network load, some nodes may have no data to send during their time slots, while other nodes cannot take advantage of this time slot. Time slots, resulting in a waste of time slots, reducing network throughput and increasing end-to-end delay
The reason is that the spatial multiplexing of the channel is ignored

Method used

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  • Method for realizing water sound sensor network MAC (Media Access Control) protocol based on ALOHA and TDMA (Time Division Multiple Access)
  • Method for realizing water sound sensor network MAC (Media Access Control) protocol based on ALOHA and TDMA (Time Division Multiple Access)
  • Method for realizing water sound sensor network MAC (Media Access Control) protocol based on ALOHA and TDMA (Time Division Multiple Access)

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Experimental program
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Effect test

Embodiment 1

[0046] Such as figure 1 Shown, the present invention comprises following process:

[0047] 1 . Deduce the time limit for a node to receive data frames from other nodes while waiting for the acknowledgment reply frame ACK after sending data in the main time slot;

[0048]Suppose the distance between node A and node B, node B and node C is set as ,Unit is ; Carrier speed of propagation ,Unit is ; The data rate of the network is ,Unit is ;The length of the data frame (DATA frame) is set to , the length of the response frame (ACK frame) is set to , the unit of frame length is .

[0049] In a certain main slot of Node B, suppose R Time is the start time of the RTS segment, C Time is the start time of the CTS segment, D The time is the start time of the DATA segment, A Time is the start time of the ACK segment. Node B has sent the DATA frame to node C, and the ACK frame that node C replies to node B will be in A Time to start sending out.

...

Embodiment 2

[0079] against Figure 4 The network topology shown, the simulation parameters are: signal propagation speed 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 , ACK 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 RTS segment, CTS segment, DATA segment, and ACK segment are: 1.2 s , 1.2 s , 7.7 s , 1.2 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 , 30 s , 35 s , 40 s , 45 s , 50 s , 55 s , 60 s , 65 s , 70 s , ...

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Abstract

The invention provides a method for realizing water sound sensor network MAC (Media Access Control) protocol based on ALOHA and TDMA (Time Division Multiple Access). Based on the traditional TDMA mechanism, in the method, time is divided according to time slot, a semi-duplex communication model is adopted, and long propagation time-delay characteristics of water sound communication and space reusability of a channel, and the ALOHA mechanism competition time slot are adopted under the condition of not affecting main node transmission data and unsuccessfully handshaking with the main nodes and not receiving other nodes of the CTS (Clear To send)frame, and receiving data during the process of confirming outstanding messages and data transmission failure delay transmission process are increased so as to realize communication between one node and a plurality of nodes, network throughput is improved and network end-to-end delay is reduced. The method provided by the invention is suitable for the water sound sensor network and other long propagation time-delay communication networks, is easy to implement and high in actual application value.

Description

technical field [0001] The invention relates to an implementation method of a MAC layer protocol of an underwater acoustic sensor network based on ALOHA 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 to send signals to the base station. Under the conditions of timing and synchronization, the base station sends signals to multiple The signals of each mobile terminal are arranged in a predetermined time slot for transmission in sequence. As long as each mobile terminal receives in the designated time slot, it can distinguish and receive the signal sent to it in the combined signal. [0003] Network throughput and end-to-end delay are the basic technical indicators that reflect network performance. When the traditional TDMA protocol has a low network load, some nodes may have no data to se...

Claims

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Application Information

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IPC IPC(8): H04B13/02H04W80/02H04W84/18
Inventor 高翔方世良李霞李启玲
Owner SOUTHEAST UNIV
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