TD-LTE系统带宽自适应接纳控制算法

Admission control algorithm based on adaptive bandwidth in TD-LTE system

针对现有呼叫接纳控制算法受系统可用带宽限制的问题,在已有带宽降级算法的基础上,提出一种基于带宽自适应技术的算法。综合考虑TD-LTE系统多业务环境下各类业务实时占用物理资源块的情况和业务的优先级,通过对系统现有呼叫进行带宽降级,释放一部分资源块,从而接纳新呼叫,而当用户离开,物理资源块被释放时,对被降级的用户进行带宽恢复,使其占用资源块达到最大值。分析和仿真结果表明,在保证已有用户服务质量的基础上,新算法可减小新呼叫阻塞率和切换呼叫掉话率,缓解系统拥塞。

On the basis of the existing bandwidth degradation algorithm, an call admission control algorithm based on adaptive bandwidth technology is proposed to reduce other algorithms＇ constraints from available bandwidth. The priority of service and the situation of all kinds of realtime service occupy physical resource blocks in TD-LTE system multiple service environments are considered in this algorithm. Some resource blocks can be released and a new call is allowed after downgrading bandwidth of the existing system calls. When a user leaves, the physical resource blocks are released and the downgraded bandwidth is reused, therefore the occupy resource blocks can reach the maximum value. Analysis and simulation results show that, on the basis of ensuring the QoS of existing users, the proposed algorithm can reduce the new call blocking rate and the handoff call dropping rate and alleviate congestion.