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arXiv cs/0611086cs.NIcs.ITmath.IT
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面向实时的流媒体的可靠多路径路由方案

Reliable Multi-Path Routing Schemes for Real-Time Streaming

Emin Gabrielyan, Roger D. Hersch

摘要:

在离线流传输中,分组级擦除弹性前向纠错(FEC)码依赖于接收器处的不受限制的缓冲时间。在实时的【形】流中,极短的回放缓冲时间使得FEC对于保护单路径通信免受长链路故障的影响是低效的。已经示出,即使在缓冲时间有限时,添加到单个路径路由的一个替代路径也使得分组级FEC适用。然而,进一步的路径分集增加了底层链路的数量,从而增加了总链路故障率,可能需要来自发送方的更多FEC分组。我们引入了一个标量系数的评级多路径路由拓扑的任何复杂性。它被称为冗余总体要求(ROR),并且与保护通信所需的自适应FEC分组的总数成比例。利用本文提出的毛细管布线算法,我们构建了数千种多路径布线模式。通过计算它们的ROR系数,我们表明,与预期相反,当毛细管路由算法实现双路径路由的进一步多样性时,FEC码的总体要求降低。

英文摘要:

In off-line streaming, packet level erasure resilient Forward Error Correction (FEC) codes rely on the unrestricted buffering time at the receiver. In real-time streaming, the extremely short playback buffering time makes FEC inefficient for protecting a single path communication against long link failures. It has been shown that one alternative path added to a single path route makes packet level FEC applicable even when the buffering time is limited. Further path diversity, however, increases the number of underlying links increasing the total link failure rate, requiring from the sender possibly more FEC packets. We introduce a scalar coefficient for rating a multi-path routing topology of any complexity. It is called Redundancy Overall Requirement (ROR) and is proportional to the total number of adaptive FEC packets required for protection of the communication. With the capillary routing algorithm, introduced in this paper we build thousands of multi-path routing patterns. By computing their ROR coefficients, we show that contrary to the expectations the overall requirement in FEC codes is reduced when the further diversity of dual-path routing is achieved by the capillary routing algorithm.

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