为提高无线接入控制过程的性能,针对WCDMA系统各种业务的特点,采用了能有效保障QoS的上行接入控制方案,依据具体业务的分类和QoS指标来分配网络资源,提出了一种新的接入算法-PCD(Priori-ty Code based Diffserv)算法.设计了实时和非实时业务呼叫的信令流程,并对提出的算法和现有的接入算法进行了仿真评估.结果表明,该方法有效地解决了上行接入控制问题,与随机接入算法相比具有良好的业务吞吐量和时延性能,提高实时业务的服务质量.
A novel methodology for prediction of network traffic, WPANFIS, which relies on wavelet packet transform （WPT） for multi-resolution analysis and adaptive neuro-fuzzy inference system （ANFIS） is proposed in this article. The widespread existence of self-similarity in network traffic has been demonstrated in earlier studies, which exhibits both long range dependence （LRD） and short range dependence （SRD）. Also, it has been shown that wavelet decomposition is an effective tool for LRD decorrelation. The new method uses WPT as extension of wavelet transform which can decoorrelate LRD and make more precisely partition in the high-frequency section of the original traffic. Then ANFIS which can extract useful information from the original traffic is implemented in this study for better prediction performance of each decomposed non-stationary wavelet coefficients. Simulation results show that the proposed WPANFIS can achieve high prediction accuracy in real network traffic environment.
The Internet today originates from the advanced research project agency network （ARPANET） and evolves constantly during the past years. However, with incremental ＇patches＇ on the Internet, the current network architecture faces many problems which are too difficult to solve. In the light of recent interest in re-designing the Internet, the separation of core network and customer edge network, and the separation of identifier and locator receive wide consensus among scientists. We follow this direction and propose a new hierarchical network with diversified customer edge access （HNDCE） in this paper. We use switching addresses, routing addresses and identifiers to implement a true core/edge and locator/identifier split. In the core network, hierarchical switching addresses combined with tree topology makes routing replaced by switching. The Viliant load-balancing （VLB） structure is used here to compensate the topology＇s reliability and scalability. In the customer edge network, the split of locator and identifier makes it possible to deploy various routing schemes and new services. Hierarchical mapping system is also designed to support this new architecture.
