Abstract: A method and apparatus used by a communication system (100) to optimize the re-registration of communication system users that use a variable speed multiple-user communication unit (VSMCU) (110). VSMCUs (110) can be located on mobile vehicles, these mobile vehicles can move at different speeds at different times. VSMCUs (110) can collect registration information, obtain velocity information, determine re-registration distances, and determine re-registration factors. VSMCUs (110) send re-registration factors to the system. The system uses the re-registration factors to determine a modified ring-alert area for the associated VSMCU.

Abstract: A plurality of subscriber units (16) operate in a communication system (10) having dynamic nodes such as satellites (12). A communication management center (14) controls interface parameters and protocol employed by subscriber units (16). A system and method is employed to dynamically alter interface protocol used by subscriber units (16). Communication management center (14) calculates a balance between a first portion of subscriber units (16) assigned to perform attach-detach registration and a second portion of subscriber units (16) assigned to abstain from performing attach-detach registration when associating and disassociation from communication system (10). As available communication bandwidth varies according to present of future communication patterns, subscriber units (16) may be dynamically reassigned perform or abstain from performing attach-detach registration.