Abstract
Backup real-time channels is a technique to provide uninterrupted service in the presence of router failures during real-time transmissions. This technique adds the notion of availability to the concept of QoS (Quality of Service), usually expressed in terms of guaranteed throughput and maximum delays only. Availability comes at the cost of increasing the required resource (bandwidth, buffers) reservations, due to the needs of a backup channel. However, this extra resources reservation is potentially wasted, since fault rates are very low. This paper proposes a systematic method for estimating and optimizing resource reservations. This approach is based on inaccurate failure detection in order to reduce latency is proposed. The cost of inaccurate failure detection is that the backup channel will be activated and utilized unnecessarily upon detection of failures. However, the paper shows, through simulations and using MPEG transmission traces, that the percentage of false failures is almost negligible.
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