17. A method of operation for a communication system, the communication system including a plurality of network elements of a fixed network and a plurality of user equipments, at least some of the plurality of network elements and the plurality of user equipments comprising a charging proxy, the method comprising: initializing charging topics, each charging topic being associable with charging data; for each of the charging topics, registering proxies of the charging proxies as publishing proxies; for each of the charging topics, registering proxies of the charging proxies as subscribing proxies; receiving charging data messages from proxies; validating a first set of charging data belonging to a first charging topic in response to a first set of charging proxies registered as publishing proxies for the first charging topic; and transmitting the first set of charging data to a second set of charging proxies registered as subscribing proxies for the first charging topic.
19. The method of claim 17 further comprising: initializing a charging topic in response to receiving a charging topic setup request.