采用时延限制和资源预测的异构无线网络选择策略

发布时间：2018-05-28 08:09

本文选题：异构无线系统 + 网络选择　；参考：《西安交通大学学报》2014年02期

【摘要】：针对异构无线网络中不同业务的时延限制和网络资源不确定性的问题,提出了一种联合时延限制和资源预测的网络选择(JDPNS)策略。该策略首先预测下一时隙信道资源的空闲概率和占用概率,如果空闲概率大于占用概率,则认为信道资源可以使用,如果空闲概率小于占用概率,则认为信道资源被占用,可以避免盲目接入造成的资源浪费和网络负载不均衡,然后以基于有效容量的信息传输速率作为目标函数,以用户的功率控制作为约束条件,在保障用户服务质量的前提下,采用凸优化理论得到最大化的网络传输速率,最后用户根据预测结果和传输速率两方面因素,选择具有充足带宽资源和最大传输速率的网络进行接入。仿真实验表明:在不同信道衰落条件下,JDPNS策略与注水策略相比,传输速率提高了1倍;JDPNS策略的传输速率更接近已知网络资源空闲情况的速率上界。
[Abstract]:Aiming at the problem of delay limitation and resource uncertainty of different traffic in heterogeneous wireless networks, a network selection JDPNS strategy combining delay constraints and resource prediction is proposed. The strategy first predicts the idle probability and occupancy probability of channel resources in the next slot. If the idle probability is greater than the occupancy probability, the channel resources can be used, and if the idle probability is less than the occupancy probability, the channel resources are considered to be occupied. It can avoid the resource waste and network load imbalance caused by blind access, then take the information transmission rate based on the effective capacity as the objective function, take the power control of the user as the constraint condition, and ensure the user's quality of service under the premise of ensuring the user's quality of service. The convex optimization theory is used to obtain the maximum network transmission rate. The end user selects the network with sufficient bandwidth resources and maximum transmission rate to access the network according to the prediction results and the transmission rate. Simulation results show that the transmission rate of JDPNS strategy is more than that of water injection strategy under different channel fading conditions, and the transmission rate of JDPNS strategy is closer to the upper bound of the known idle network resource.
【作者单位】：西安电子科技大学综合业务网理论及关键技术国家重点实验室;
【基金】：国家自然科学基金资助项目(61231008,61101143) 长江学者和创新团队发展计划资助项目(IRT0852) 国家“111计划”资助项目(B08038)
【分类号】：TN929.5

【参考文献】