Method of service flow access control and bandwidth allocation based on OFDM system

Abstract

The invention relates to a service flow access control and bandwidth allocation method based on an orthogonal frequency division multiplexing (OFDM) system, which mainly solves the problems of service flow access control and system bandwidth resource allocation in the OFDM system. The method of the invention essentially comprises the following steps: (1) carrying out access control according to the management information of dynamic service flow and generating a bandwidth-reserved distribution list; (2) distributing the bandwidth-reserved according to the bandwidth-reserved distribution list; and (3) distributing the rest bandwidth according to a weight factor configuration table. The method provided by the invention not only effectively improves the use efficiency of the system resources, but also ensures fairness among a plurality of service types and prevents 'starvation' phenomenon caused by that the bandwidth cannot be obtained due to the comparatively low priority of users.

Description

technical field [0001] The present invention relates to a broadband access technology based on Orthogonal Frequency Division Multiplexing (OFDM), in particular to a service flow access control and bandwidth allocation method in the medium access control layer (MAC) of the OFDM system. Background technique [0002] The IEEE802.16 standard adopts the physical layer technology based on Orthogonal Frequency Division Multiplexing (OFDM). The standard specifies the physical layer (PHY) and media access control layer (MAC) of the system's air interface. [0003] After the subscriber station SS (or MS) successfully accesses the network, it will establish a corresponding service flow to carry and transmit data services. Service flow is a unidirectional data flow, which defines a set of QOS parameters that meet the user's quality of service requirements, including maximum continuous bandwidth, minimum reserved bandwidth, maximum delay, etc., and is divided into 4 types of services ac...

AI Technical Summary

Problems solved by technology

None of the existing service flow access control methods can achieve a good balance between ensuring the service quality of the business and improving the utilization efficiency of system bandwidth resources

Or in order to improve the utilization efficiency of system resources, the number of service streams accessed in the system is too large, which will inevitably cause the QOS requirements of some services to be unable to be met.

Or too much emphasis on the service quality of the business will cause the system's resource utilization efficiency to be low

Secondly, the existing business scheduling and bandwidth allocation algorithms are based on priority scheduling and allocation ideas, especially when high-priority business loads are heavy, they will preempt the bandwidth of lower-priority services. There will be a phenomenon that lower-priority services will never get bandwidth and "starve to death"

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