Time Division Multiple Access Method for LEO Satellites

Abstract

The invention discloses a low orbit satellite time division multiple access method. The method includes: dividing the uplink data frame into time slots; making the ground equipment apply to the satellite for reserved time slots based on the divided time slots; setting an access protocol so that the satellite sends the ground equipment to the ground equipment according to the service level and link status of the ground equipment Allocate reserved time slots and broadcast the allocation results to ground equipment; make ground equipment apply for data time slots to satellites based on the divided time slots; set data time slot allocation protocols so that satellites can send data to ground equipment according to the service level and link status of ground equipment Allocate data time slots and broadcast the allocation results to ground equipment; enable ground equipment to communicate with satellites based on the allocated data time slots. The low-orbit satellite time division multiple access method of the present invention can ensure that ground equipment with a higher service level can preferentially access satellites to obtain time slot allocation, and ground equipment with the same service level with better link status can preferentially access satellites to obtain time slots. slot allocation.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a low-orbit satellite time division multiple access method. Background technique [0002] The satellite communication system is an important part of the global communication system. Compared with the ground communication system, the satellite communication system has a wider coverage and application field. Among them, low-orbit satellites are one of the important carriers of satellite communication systems. With the continuous improvement of micro-satellite integration and cost-effectiveness ratio, the use of low-orbit satellite constellations to build mobile communication systems covering hotspot areas and even the world has gradually become the current trend. The mainstream solution in the industry. [0003] The Time Division Multiple Access (TDMA) protocol is a Medium Access Control (MAC) layer access protocol widely used in existing communication systems, and...

AI Technical Summary

Problems solved by technology

[0006] The existing TDMA hybrid access protocol does not fully consider factors such as service level and link status in terms of equipment access and time slot allocation, and cannot give priority to ground equipment with higher service levels and better link status to access satellites and allocate time slots. slots; adopting the "first come, first allocated" data slot allocation principle will make it difficult for equipment that accesses satellites to apply for a sufficient number of data slots, and the fairness of slot allocation is poor; because before each packet is sent, the ground All devices need to apply for data time slots from satellites, and the uncertainty of random access cannot guarantee that ground equipment can obtain data time slots on demand, which will affect the timeliness and reliability of information transmission; and due to the random access reservation subframe The length of the subframe and data subframe is fixed, and it cannot be dynamically adjusted according to the number of access devices within a certain range. This makes the duration of the random access reservation subframe too long when the number of devices connected to the network is small, reducing the uplink Service Transmission Efficiency

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