Patent ID: 8331903
Filing Date: 2012-12-11
Classification: H04L,H04M,H04W

Abstract:
1. A charging method for a Push-to-Talk over Cellular (PoC) system, the method comprising: sending an initial online charging request to an Online Charging System (OCS), the initial online charging request comprising information identifying a type of downlink channel currently used by the PoC service; receiving an initial online charging response message that is sent by the OCS and carries a downlink channel type switching trigger variable, the initial online charging response message further comprising a Granted Service Unit (GSU) reserved by the OCS according to the type of downlink channel currently used by the PoC service; monitoring the type of downlink channel used by the PoC service according to the downlink channel type switching trigger variable by monitoring usage of the reserved GSU by the PoC service according to the reserved GSU; and sending an online charging request to the OCS if switching of the type of downlink channel used by the PoC service is detected, wherein the online charging request comprises a switched type of downlink channel.