PFC – Packet Flow Context
In GPRS Release 99, a SGSN (Serving GPRS Support Node) is able to provide the BSS (Base Station System) with information related to the ongoing user data transmission in terms of a BSS PFC. These are used to describe the QoS (Quality of Service) characteristics for data transmission per mobile and are identified in terms of their PFI (Packet Flow Identity). There are three predefined Packet Flow Contexts which are used for Best Effort, SMS (Short Message Service) transmission and Signalling which do not require any form of negotiation between the SGSN and the BSS.
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