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CacheQuery: A Practical Asymmetric Communication Algorithm

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Executive Summary

The authors consider the problem of asymmetric communications, which are common in many access networks. They propose a new asymmetric communication algorithm, called CacheQuery, to leverage on the already deployed downlink bandwidth and receiver capability to accelerate the uplink data transfer from one or multiple senders to a receiver. The design of CacheQuery differs from all previous asymmetric communication algorithms in two ways: CacheQuery supports more flexible matching mechanism to identify redundant packet payload and CacheQuery allocates a small sender cache to absorb the potentially high downlink traffic overhead incurred by asymmetric communications. The trace-driven simulations indicate that, compared to existing asymmetric communication algorithms, CacheQuery achieves higher uplink transfer speed, yet reduces downlink traffic overhead.

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