| 摘要 |
In a telecommunications network of the kind which handles non-time-critical calls (NTCC) in addition to normal telephony, a congestion indication is transmitted to NTCC transmitting platforms if volume and/or rate limit for a particular communications route or switch is exceeded. Transmitting platforms (9, 10, 11) establish a transmission rate based on a gaping rate (GR). On receipt of a congestion signal the platforms calculate an Inter call delay based on a random number multipled by a weighting factor determined from the current value of GR. This provides a period during which calls are not attempted after which GR is adjusted using a common ratio to provide a higher value of GR thus transmission rate (or the rate at which calls are offered) to the congestion route is less onerous. Consecutive call failures result in a rapid increase in the value of GR leading to longer ICDs (to allow the congested route/switch to recover) and a lower traffic loading on recovery. Further, multiple transmitting platforms resume sending at different times due to randomisation of ICDs across platforms. |
