摘要
提出了一种基于优先级的混合自动请求重传(HARQ)方法,该方法基于多用户N通道等停异步模式HARQ。无线视频传输时每个数据块有不同的时延要求,为了减少时延在物理层对数据块传输顺序进行调整,通过重传数据块等待的时间来决定其优先级,对等待时间较长的数据块优先传输。通过对这种方法的理论分析和仿真实验,证明其在基于QoS保障无线视频传输信道条件较差情况下能有效地减少端到端的时延和丢包率。
This paper introduces a novel retransmission scheme for hybrid automatic repeat request （HARQ） based on priority, this method is used for asynchronous HARQ of multi-user N channel stop and wait mechanism. Because video transmission over wireless is sensitive to packet delay, in order to reduce packet delay retransmission, it calculates the priority based on retransmission waiting time and regulation the order about transmission, transmits packet which has longer waiting time with higher priority. According to theoretical analysis and simulation about this scheme, it can effectively reduce the end to end delay and pack loss for video retransmission over wireless channel under the circumstance of bad channel status so as to meet QoS assurances.
出处
《计算机工程》
CAS
CSCD
北大核心
2007年第24期4-6,9,共4页
Computer Engineering
基金
国家自然科学基金项目(90604016)
诺基亚中国研究中心基金资助项目
关键词
混合自动请求重传
优先级
多用户N道等停
hybrid automatic repeat request （HARQ）
priority
multi-user N channel stop and wait
