Patent Document ID: 8320878
Application ID: 12123606

Base Claim:
1. A charging system for a communication system, the charging system comprising: a plurality of network elements of a fixed network of the communication system; a plurality of user equipments of the communication system, at least some of the plurality of network elements and the plurality of user equipments comprising a charging proxy; and a charging server comprising: a topic controller for initializing charging topics, each charging topic being associable with charging data, a publication controller for, for each of the charging topics, registering proxies of the charging proxies as publishing proxies, a subscription controller for, for each of the charging topics, registering proxies of the charging proxies as subscribing proxies, a receiver for receiving charging data messages from proxies, a charging data receiver for 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 a transmitter for transmitting the first set of charging data to a second set of charging proxies registered as subscribing proxies for the first charging topic.

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Claim 2:
2. The charging system of claim 1 wherein the charging data receiver is arranged to include charging data of charging data messages in the first set of charging data only for charging data messages received from charging proxies of first set of charging proxies.