| 摘要 |
This invention relates to the efficient use of resources in broadband telecommunications networks when handling bursty data traffic. A new technique shapes the data traffic profile to efficiently maximize the bandwidth reservation scheme whilst minimizing data loss and delay. The Fast Bandwidth Reservation Shaper (FBRS) comprises a FIFO buffer with three thresholds (T1-T3), a server, and a Fast Reservation Protocol (FRP) control function which monitors the state of the queue and its associated thresholds, alters the service rate of the server, and handles the FRP protocol. With an empty buffer, a zero or small bandwidth is allocated to the data connection. When the first buffer threshold is reached, the FRP controller attempts to negotiate a small data rate (R1) with the network. As the queue grows to the second threshold (T2), the FRP controller attempts to negotiate a higher data rate (R2), slightly larger than the peak data rate for that traffic. If the buffer completely empties, threshold (T3) will be reached and the FRP controller will clear down the allocated bandwidth to a zero or small bandwidth. The buffer size (L) and T1 and T2 can be designed to meet service parameters by guaranteeing a maximum delay and a maximum data loss probability. By careful choice of the three thresholds and service rates, the FBRS improves the efficiency of fast bandwidth allocation schemes by reducing the peak bit rate and increasing the duration of small data bursts to a guaranteed minimum that is in excess of the round trip delay.
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