Ranging schemes for fast dynamic recovery of DOCSIS networks

Optimized recovery of DOCSIS networks using reserved persistent ranging

“…Yet, the latter result can be further improved by applying the Single Backoff Shift (SBS) and Continuous Backoff Shift (CBS) schemes described in [10], in conjunction with the 8-priority one. Although the distribution of the CM population into 8-priority sets leads to less CMs competing simultaneously, we can not eliminate the ranging delay of the latter CMs caused by the selection of high backoff values and therefore reduce the large number of idle ranging opportunities.…”

“…The diversity in the decrease of the recovery time for different CM populations in Fig. 4 is analyzed in [10] and is due to the large amount of idle opportunities that are deduced as the percentage of non-ranged CMs increases as well as due to the dynamic backoff scheme employed.…”

“…In [10] and [13] it was introduced a subtly different approach, namely the persistent ranging algorithm (PRA), and showed that it performs better that the one used in DOCSIS in case of a power outage event.…”

“…Issues related to the DOCSIS CATV protocol have been studied over the last few years [4], [5], [6], [11], [14], [15], including service disruption events such as large scale power outages [10], [12], [13]. In case of service disruption the connection between the Head-End (HE) and the subscriber Cable Modem (CM) is terminated.…”