Rapid fault detection and recovery for IP telephony
Rapid fault detection and recovery for IP telephony
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DOI：
10.1109/icc.2004.1312758
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发表时间：
2004-06
期刊：
影响因子：
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通讯作者：
M. Karol;P. Krishnan;J. J. Li-J.
中科院分区：
文献类型：
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作者：
M. Karol;P. Krishnan;J. J. Li-J.
短的低带宽保活分组可以被注入VoIP分组流中，以快速检测故障和恶化的网络条件（例如，增加延迟、抖动或损耗）。保活数据包可以被复制，也可以用于连续监控和比较主要和备用网络路径的延迟和丢失特性，从而在检测到故障或恶化的QoS条件时，帮助控制呼叫（正在进行和将来）到备用路由路径（或电路交换PSTN）的快速切换。通过在多条路径上同时发送保活数据包的副本来进行差分延迟测量和比较，所提出的技术避免了许多常见的同步和定时错误。我们研究各种性能权衡，并描述了几种方法来实现所提出的架构和技术。
Short, low-bandwidth keep-alive packets can be injected into VoIP packet streams to rapidly detect faults and deteriorating network conditions (e.g., increasing delay, jitter, or loss). The keep-alive packets can be duplicated and also used to continuously monitor and compare the delay and loss characteristics of primary and alternate network paths, and thereby help control the rapid switchover of calls (in-progress and future) to alternate routing paths (or the circuit-switched PSTN) when faults or deteriorating QoS conditions are detected. By simultaneously transmitting copies of keep-alive packets over multiple paths to make the differential delay measurements and comparisons, the proposed techniques avoid many common synchronization and timing errors. We examine various performance tradeoffs and describe several ways to implement the proposed architectures and techniques.