Flexible access control in broadband communication networks
Shuang Hui Deng · ERA: Education and Research Archive (University of Alberta) · 1992
A flexible bandwidth call service is proposed in this thesis. Its call control protocol is designed and specified. The new protocol is based on a new admission control and bandwidth allocation scheme, namely the flexible access control technique proposed in this thesis. Impact of the new service, protocol and admission control and bandwidth allocation scheme on network performance is studied through theoretical analysis and simulation. Practical implementation issues are also discussed. This thesis proposes a flexible bandwidth call service concept and its call control protocol. Bandwidth demands are flexible and bandwidth allocations can be changed dynamically for calls in-progress. A new access control scheme is designed in the thesis. The new scheme allows bandwidth to be relinquished from and re-allocated to in-progress calls. Bandwidth allocated to each call can be reduced through relinquishment when the traffic load is high, and increased through re-allocation when the traffic load is low. This thesis presents an extension of the conventional knapsack problem to the flexible knapsack one and its solution algorithms. The flexible knapsack problem is used to model the flexible access control in order to maximize instantaneous rewards. In addition to performance analysis of the new protocol and access control scheme, the existence of a threshold structure for optimal dynamic access control policies is proved in the thesis. Protocol validation and simulation studies are also reported. Discussions on practical applications of the results is presented in this thesis. This study is of immediate benefit to both network designers and service providers.