发明名称 |
METHOD AND APPARATUS FOR LINE RATE CONTROL IN A DIGITAL COMMUNICATIONS SYSTEM |
摘要 |
A method and communications device for controlling the line rate used on a communications link. The method includes receiving frames of digital information, computing a measure of the number of frames received in error in a sliding time window and generating a command to change the line rate as a function of the measure. The use of a sliding time window captures variations in the line quality over an extended period of time; thus, significant disturbances which might otherwise be missed are captured. The measure of the number of frames received in error is computed by applying a many-to-one mapping to the actual number of frame errors received since a previous sampling instant; thus, insignificant short-term disturbances which might otherwise temporarily corrupt the line quality estimate are eliminated. As a result, commands to change the line rate are based on a better estimate of line quality and the incidence of thrashing in the presence of recurring noise bursts is reduced, leading to increased data throughput. A back-off timer may be used for preventing an upgrade in line quality from occurring immediately following a downgrade, further decreasing the incidence of thrashing.
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申请公布号 |
CA2317912(A1) |
申请公布日期 |
2001.03.14 |
申请号 |
CA20002317912 |
申请日期 |
2000.09.07 |
申请人 |
NORTEL NETWORKS CORPORATION |
发明人 |
ALB, CRISTIAN;MATUSZEWSKI, JERZY;TAYLOR, THOMAS P.;SLONOSKY, MICHAEL J. |
分类号 |
H04L1/00;(IPC1-7):H04L1/20;H04L12/26 |
主分类号 |
H04L1/00 |
代理机构 |
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