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An implementation method of an improved crdsa protocol suitable for low-orbit satellite Internet of Things

A low-orbit satellite and Internet of Things technology, applied in the field of satellite communications, can solve problems such as data conflicts and increased delays, achieve significant progress, highlight substantive features, and solve the effect of a large number of terminal access

Active Publication Date: 2022-03-22
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The purpose of the present invention is to propose an improved CRDSA protocol implementation method suitable for low-orbit satellite Internet of Things, to solve the problem of low-orbit satellites carrying out data conflicts and increasing delays for massive terminals

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the present invention is described in further detail.

[0031] From the perspective of technical overview, the present invention proposes an improved CRDSA++ protocol by studying and analyzing the existing contention-based diversity slot ALOHA multiple access protocol. Theoretical analysis and simulation results show that CRDSA++ with 3 copies The overall performance of the protocol is good, and on the basis of this protocol, the probability that the terminal has data packets sent is added, the number of terminals and the randomness of the terminal sending data packets are increased. Theoretical analysis and simulation results prove the effectiveness of the designed method. effectiveness.

[0032] The low-orbit satellite Internet of Things architecture model is as follows: figure 1 As shown, the present invention relates to the access part inside, which is mainly divided into the performance analysis of the random multipl...

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Abstract

The present invention discloses an improved CRDSA protocol suitable for low-orbit satellite Internet of Things by researching and analyzing the existing contention-based diversity slot ALOHA multiple access protocol (CRDSA), including: analyzing the CRDSA multiple access protocol Incoming protocol and its throughput; increase the number of times to send data packets to derive the formula for the throughput and packet loss rate of the CRDSA++ protocol; carry out theoretical analysis and simulation on the formula, and verify the correctness; based on the simulation, conclude The throughput and packet loss rate performance is better. The number of sending copies of the CRDSA++ protocol is 3; on the basis of the CRDSA3 protocol, the probability of sending data packets is added. The present invention proposes an improved multiple access method aimed at the working characteristics of the low-orbit satellite Internet of Things, and derives the calculation formulas for the throughput and packet loss rate of the CRDSA++ protocol with the number of copies r, and is convenient to make the best solution through theoretical analysis and simulation. The choice of the number of copies solves the problem of a large number of terminals accessing the low-orbit satellite Internet of Things.

Description

technical field [0001] The invention is an improved CRDSA protocol applicable to low-orbit satellite internet of things, which belongs to the field of satellite communication. It mainly involves an efficient and reliable multiple access protocol for mass connections of the Internet of Things. Background technique [0002] With the rise of the Internet of Things, the type and number of devices that provide Internet of Things access capabilities are undergoing drastic changes. However, because the terrestrial Internet of Things mainly covers cities and suburbs with relatively dense services, the coverage is very limited. In some special environments such as deserts, forests, mountains, and oceans, the terrestrial Internet of Things cannot fully cover, which limits the application of the Internet of Things. And development. Therefore, the ground communication network alone cannot meet the needs of social development, and it is necessary to combine the satellite communication ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08H04W84/06H04W4/70
CPCH04W4/70H04W74/08H04W74/0841H04W84/06
Inventor 张更新韦芬芬谢继东
Owner NANJING UNIV OF POSTS & TELECOMM
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