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A link scheduling method and system suitable for long-delay SIC networks

A link scheduling and scheduling algorithm technology, applied in transmission systems, services based on specific environments, machine-to-machine/machine-type communication services, etc., can solve the problem of unstable underwater acoustic signal propagation speed, underwater acoustic communication delay jitter, Problems such as limited battery energy, to achieve the effect of improving network throughput, reducing data transmission delay, and shortening access time

Active Publication Date: 2020-01-07
INST OF COMPUTING TECH CHINESE ACAD OF SCI
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Problems solved by technology

In addition, affected by environmental factors such as salinity, temperature, ocean current, and depth, the propagation speed of underwater acoustic signals in water is very unstable, which causes delay jitter in underwater acoustic communication
High latency and delay jitter problems bring great challenges to the time synchronization of underwater sensor network nodes
[0005] 2. Limited battery energy and high power consumption
[0006] 3. Limited communication capabilities
SIC technology cannot resolve all conflicts

Method used

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  • A link scheduling method and system suitable for long-delay SIC networks
  • A link scheduling method and system suitable for long-delay SIC networks
  • A link scheduling method and system suitable for long-delay SIC networks

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[0049] In order to make the above-mentioned features and effects of the present invention more clear and understandable, the following specific examples are given together with the accompanying drawings for detailed description as follows.

[0050] The signal-to-noise ratio (Signal Noise Ratio, SNR) formula 1 of the underwater acoustic channel is shown as:

[0051]

[0052] where P t is the transmit power, P r is the received power, P N is the channel ambient noise power, A(d,f) is the underwater acoustic channel fading function, and its formula is as follows:

[0053] A(d,f)=d k a(f) d (2)

[0054] where d is the distance between the receiving node and the sending node, k is the channel loss index, which usually takes a value between 1 and 2, f is the underwater acoustic carrier frequency, and a(f) is the underwater acoustic channel absorption coefficient.

[0055]

[0056] Ambient noise power P under water N Mainly caused by sea waves, its formula is as follows...

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Abstract

The present invention relates to a link scheduling method and system suitable for long-delay SIC networks, including: according to the number of sending nodes, the environmental noise power and the signal-to-interference ratio threshold of the SIC algorithm, the transmission signal of each sending node can be generated by the SIC algorithm For the decoded minimum power value, set the minimum power value as the K-SIC power threshold vector to divide the transmission power level of each sending node; according to the amount of data sent by each sending node, determine the load status of the long-delay network, and according to the load status and The transmission power level executes the minimum frame length scheduling algorithm to generate the minimum scheduling frame length of the long-delay network; according to the number of sending nodes, the minimum scheduling frame length and the receiving mechanism of the receiving node, the minimum power scheduling algorithm is executed to obtain the minimum power consumption of the entire network Link scheduling strategy. In this way, the transmission efficiency between nodes in the long-delay SIC network can be improved, and the overall energy consumption of the long-delay SIC network can be reduced.

Description

technical field [0001] The invention relates to the field of long-delay network media medium access control in information technology, in particular to a link scheduling method and system suitable for long-delay SIC networks. Background technique [0002] Since the acoustic channel is used as the data transmission method, the transmission speed of sound in water is only 1500m / s, so the Underwater Sensor Networks (UWSN) is a typical long-delay network in real life. The main task of UWSN is to perceive the underwater objective world, transmit the data sensed by underwater sensors in a self-organizing manner, and then organize, process, fuse, analyze and store these data. Therefore, unlike common network technologies (such as mobile communication networks, terrestrial wireless sensor networks, etc.), UWSN has the characteristics of large network scale, self-organization and high dynamics. [0003] The Media Access Control (MAC) layer is located between the physical layer and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W52/24H04W72/12H04B13/02H04W4/38H04W4/70H04W56/00
CPCH04W52/241H04W52/243H04B13/02H04W56/001H04W72/12H04W72/542H04W72/52
Inventor 徐亦达李超徐勇军刁博宇王琪安竹林
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI
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