| 摘要 |
A sum-of-delays algorithm in a digital mobile communication bandwidth-varying network is employed to estimate link buffer size and queue length in an undying network connection. In particular, mechanisms associated with the process compensate for link bandwidth variations. In a particular embodiment, passive estimation are employed to implement the process by simply measuring the in-band data packet timings to perform estimation, thus eliminating the need for transmission of extra measurement packets. This method enables the integration of the link buffer size estimation algorithm into existing transport protocols such as TCP to optimize flow and congestion controls. As part of the invention, a new congestion control method called TCP Queue-length-Adaptive (TCP-QA) is developed to employ the sum-of-delays algorithm in the TCP sender computer to control the data flow in a TCP connection. Compared to existing TCP variants, TCP-QA can achieve significantly better network bandwidth utilization in bandwidth-varying networks.
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