一种卫星移动通信语音业务半持续调度机制

A Semi-persistent Scheduling Mechanism for Voice Service in Satellite Mobile Communication

基于LTE的卫星移动通信系统将3GPP LTE标准与卫星通信技术相结合,对实现移动通信的高速全球覆盖具有重要的意义.然而,卫星通信面临的高误码率、上下行带宽非对称等问题,对卫星移动通信的资源调度和服务质量保证提出了重要挑战.以LTE半持续调度机制为基础,针对卫星移动通信语音业务,提出了一种上行无线资源调度方案VoSPS.VoSPS中增加了基于上行信道质量的准入机制和截断机制,减少了上行资源的浪费;引入了一种基于语音服务满意度的语音编码速率调整算法,增加了系统的用户容量.仿真结果表明,VoSPS能有效提高系统的用户满意度和语音业务容量.

LTE-based （Long Term Evolution）satellite mobile communication system combines 3GPP LTE standards and satellite communication technology and has important significance for the global cover-age of mobile communication at a high speed.However,the problem of high bit error rate and bandwidth asymmetry in satellite communication constitutes a great challenge for the wireless resource scheduling and QoS （Quality of Service）guarantee in satellite mobile communication.Based on the semi-persistent sched-uling mechanism in LTE,we proposed an uplink wireless resource scheduling scheme named VoSPS （Voice service Semi-persistent Scheduling）.We added an access permission mechanism and a truncation mechanism based on uplink channel quality to VoSPS,reducing the waste of uplink resources.We also in-troduced a speech coding rate adjustment algorithm based on voice service satisfaction,which increased the user capacity of the system.The results of the simulation show that VoSPS can increase user satisfaction and the voice service capacity of the system effectively.