Various exemplary embodiments relate to a method performed by a policy and charging rules node of provisioning event triggers. A base station starts transmission of a control signal with predetermined power when communication between another base station and a mobile station is started and a first predetermined condition is satisfied. An algorithm module is designed in a manner that renders the algorithm module reentrant within a preemptive environment. The terminal adapter also provides a secondary communication path in the event of a failure of the primary communication path, as well as automatic recognition of different terminal protocols, various security functions, error detection, and other network administration functions to ensure a flexible system and efficient transaction processing system.