Bandwidth request method of bandwidth multimedia satellite system

Abstract

The invention relates to a bandwidth request method of a bandwidth multimedia satellite system. A bandwidth request model adopted by the invention consists of three entities including a service source, a user terminal and a satellite. The bandwidth request of the bandwidth multimedia satellite system is realized by establishing a bandwidth request system model and designing a bandwidth request sending manner, a bandwidth requirement estimation algorithm and a synchronization mechanism. According to the bandwidth request method of the bandwidth multimedia satellite system, the limitation of single bandwidth request sending manner is overcome, the problem of low utilization efficiency of a bandwidth caused by an improper updating opportunity of an estimation value of 'slot time default' is solved, and the problem of step out between a bandwidth request agent and a bandwidth management unit caused by loss of the bandwidth request is solved. Not only can the utilization efficiency of a satellite system be obviously improved, but also the instantaneity of service transmission under a heavy-load service condition can be improved.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a bandwidth request method for a broadband multimedia satellite system. Background technique [0002] The Broadband Satellite Multimedia BSM (Broadband Satellite Multimedia BSM) system is characterized by the transmission of high-speed broadband multimedia services and has developed rapidly in recent years. Compared with the traditional satellite communication system, its biggest difference is that the business carried by it has changed from low-speed data and voice services to high-speed, interactive multimedia services integrating images, audio, video and text. Since the system carries more users and more sudden business, it brings more serious challenges to the bandwidth management of the system. [0003] Bandwidth management in the BSM system mainly adopts an on-demand mode, also called BoD (Bandwidth on Demand) mode, that is, the system dynamically manages b...

AI Technical Summary

Problems solved by technology

This assumption may cause a large deviation between the estimated value of the "delinquent time slot" and the actual value, thus affecting the efficiency of bandwidth usage. Therefore, it is necessary to change the method of updating the request value to ensure that the estimated value of the number of "delinquent time slots" is consistent with the actual value. The deviation is as small as possible;

[0013] (2) The algorithm is based on the premise that the bandwidth request can always be correctly received and satisfied. However, in the case of poor channel or random access, the bandwidth request sent by the terminal may not be correctly received. In this case, it will cause bandwidth management. The out-of-synchronization of information between the agent and the bandwidth management unit will further affect the bandwidth utilization, so certain measures need to be taken to ensure the synchronization of the bandwidth management agent and the bandwidth management unit

[0014] (3) The algorithm is based on the premise that the bandwidth resources obtained by the terminal are obtained by the application of the terminal. However, the bandwidth resources obtained by the terminal in the actual system can be divided into two parts, one part is allocated to the user by the system according to the request of the terminal, and the other is Some of the excess bandwidth resources of the system are allocated to users in a free manner, and the RU-BRE algorithm does not take into account the impact of the latter on bandwidth demand estimation, which will cause the number of time slots requested by the terminal to be greater than the actual required time slots. The number of slots causes a waste of bandwidth resources, so it is necessary to distinguish between the above two situations

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