Collision-resistant random access method for satellite Internet of Things system in high-load scene

An Internet of Things system and random access technology, applied in the field of satellite communications, can solve problems such as throughput decline, propagation distance difference, power control operation inapplicability, etc., and achieve the effect of alleviating the decline of performance indicators

Active Publication Date: 2021-09-21
NANJING UNIV OF POSTS & TELECOMM +1
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  • Application Information

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Problems solved by technology

This requirement is often difficult to meet in high-load scenarios, resulting in a sharp drop in throughput with load, which is called the "avalanche" effect
However, the contention-based random access method based on capture requires that the SNR difference between colliding signals reach the threshold required for signal separation in the power domain. Neither applicable, research required

Method used

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  • Collision-resistant random access method for satellite Internet of Things system in high-load scene
  • Collision-resistant random access method for satellite Internet of Things system in high-load scene
  • Collision-resistant random access method for satellite Internet of Things system in high-load scene

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Embodiment Construction

[0059] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0060] Such as Figure 1-2 As shown, the present invention provides a collision-tolerant random access method in a high-load scenario, and the specific steps are as follows:

[0061] Step S1. For the satellite Internet of Things system access process, record the total number of time slots contained in the data frame as L, set the number of data packets sent by the terminal as N, and set the maximum interval between each data packet to send time slots number n.

[0062] Step S2, the mth terminal randomly selects the initial data packet time slot l of the terminal within the L time slots in the data frame with a probability of 1 / L m , and randomly select the time slot interval t (t≤n) for the t...

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Abstract

The invention discloses a collision-resistant random access method for a satellite Internet of Things system in a high-load scene, which is used for improving the access effect of massive terminals of the satellite Internet of Things. The method comprises: a sending terminal determines the number of sent data packets and the sending interval of the data packets; and after receiving the data frames, a receiving end performs coherent accumulation on the time slot sliding windows one by one, determines a result of each coherent accumulation, performs signal separation processing when a signal separation condition is met, and repeats the process until all terminals are accessed or no separable data packets exist. According to the method, the system throughput under the high-load access condition can be effectively improved, and the method is suitable for the working scene of massive terminal access such as the satellite Internet of Things.

Description

technical field [0001] The invention relates to a collision-tolerant random access method of a satellite Internet of Things system in a high-load scenario, and belongs to the technical field of satellite communication. Background technique [0002] The global Internet of Things is an important trend in future network development, but because the ground communication network cannot cover areas such as oceans, deserts, and rainforests, the development of the Internet of Things in these areas has a phenomenon of mismatch between service capabilities and needs. The satellite communication system has the ability of long-distance, wide coverage, and global all-time service, which is an effective way to solve the above problems. However, the massive access demand in the Internet of Things scenario brought about by the wide coverage of satellites and the light control of satellite Internet of Things terminals The contradiction between the design constraints of low energy consumption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185H04W74/08G16Y10/75
CPCH04B7/18586H04W74/0833G16Y10/75
Inventor 刘子威朱天天张更新
Owner NANJING UNIV OF POSTS & TELECOMM
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