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Cross-layer protocol communication method based on planet network MAC protocol

A satellite network and protocol communication technology, applied in the field of satellite communication, can solve the problem of not considering the impact of protocol performance, etc., to achieve the effect of improving channel utilization, overcoming performance impact, and enhancing capabilities

Inactive Publication Date: 2011-05-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a MAC protocol based on satellite network to solve the problem that the existing cross-layer designed MAC satellite network protocol mainly focuses on the MAC layer for improvement without considering the influence of the dynamically changing channel state on the performance of the protocol. cross-layer protocol communication method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0014] Specific implementation mode one: this implementation mode consists of the following steps:

[0015] Step 1. The ground terminal can apply for resources from the satellite through two access methods: random reservation and additional reservation. The ground terminal first judges whether it has received a free allocation time slot in the current frame. If it receives a free allocation time slot, it can then In one frame, apply for resources to the satellite by means of additional reservation; if no time slot is allocated, apply for resources to the satellite by means of random reservation;

[0016] Step 2. Before sending a random reservation application, it is necessary to estimate the channel state to determine whether to send a reservation, so as not to affect the application information of other terminals; the ground terminal can obtain the state of the uplink channel by estimating the state of the downlink channel. The attenuation frequency conversion algorithm can e...

specific Embodiment approach 2

[0023] Specific embodiment two: the difference between this embodiment and specific embodiment one is to adopt multi-state Markov chain to simulate the time-varying characteristic of satellite channel, set up the MAC agreement that needs to evaluate in network emulation software, set up multi-state Markov chain and MAC The interface of the protocol, when the state changes caused by the operation of the MAC protocol, read the channel state from the Markov channel model to evaluate the protocol performance. Satellite channels are divided into multiple channel states according to the bit error performance requirements of the transmitted data and the signal-to-noise ratio requirements of each transmission mode when the bit error requirements are met. Each state corresponds to a modulation coding transmission mode, and a multi-state Markov model is established according to the rain attenuation characteristics for the performance evaluation of the MAC protocol.

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Abstract

The invention is a cross-layer protocol communication method based on a satellite network MAC protocol, which relates to a MAC protocol applied to a satellite network, for solving the problem that focuses on MAC improvement, in no consideration of the effect of dynamic channel status to protocol performance in current MAC satellite network protocol. When receiving a free distributive timeslot, land terminals apply for resource to a satellite dispatcher in the next frame, otherwise the land terminals apply for resource to the satellite dispatcher; a uplink channel in deep fade state performs no reserved information sending, and the uplink channel in otherwise state performs reserved information sending; the satellite dispatcher transmits the land terminals in different channel states in corresponding modes, forwards data from the land terminals as the next line data, and dispatches channel resource, at the same time, dispatches the transmission mode of next frame for each terminal, andmoves the ID of a land terminal to the list tail after finishing the timeslot reservation of the land terminal.

Description

technical field [0001] The invention relates to a MAC protocol applied in a satellite network, and belongs to the technical field of satellite communication. Background technique [0002] The satellite communication system has the characteristics of being able to provide a wide range of seamless coverage at low cost and not limited by geographical conditions. The communication capacity of the satellite communication system is very large, and can be allocated to each user on demand, which can meet various data communication needs of education, business and family. [0003] In the wired network, the protocol design method is a layered design according to the 7-layer protocol model of OSI. Each protocol layer has relatively independent functions. Each layer only uses the fixed information provided by the next layer, and does not care about the lower layer. working process. This strict hierarchical design method can't adapt well to the characteristics of wireless communication...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06H04B7/185
Inventor 李陆郭庆王振永井庆丰
Owner HARBIN INST OF TECH
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