PCRF Session Identifier for PDN Access Differentiation
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Solution Overview
Problem
The Policy and Charging Rules Function (PCRF) in the Evolved Packet System (EPS) cannot distinguish between multiple connections to the same Packet Data Network (PDN) Access Point Name (APN) and associate the correct Quality of Service (QoS) and charging rules, leading to incorrect charging and QoS control when a User Equipment (UE) accesses the same APN for multiple times.
Innovation Solution
Incorporating a session identifier in the gateway control session establishment indication to uniquely identify IP Connectivity Access Network (IP-CAN) sessions, allowing the PCRF to differentiate between reaccesses and bearer binding and event report function entity relocations, ensuring accurate QoS and charging rule association.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the PCRF uses traditional session identification methods without session identifiers, then the system structure remains simple, but the PCRF cannot distinguish between multiple connections to the same APN and cannot correctly associate QoS and charging rules
Solution Approach 1:
The patent introduces a session identifier as a new parameter in the gateway control session establishment indication message. This parameter change enables the PCRF to uniquely identify each IP-CAN session, allowing it to distinguish between multiple connections to the same APN and correctly associate QoS and charging rules with each session.
2Reliability
If the PCRF cannot differentiate between reaccesses and bearer binding entity relocations, then the system operation remains simple, but incorrect QoS and charging control occurs
Solution Approach 1:
The patent implements a feedback mechanism where the BBERF entity includes session identifier information in the gateway control session establishment indication message sent to the PCRF. This feedback allows the PCRF to determine whether a UE is reaccessing the network or experiencing BBERF relocation, enabling correct QoS and charging rule association based on the session history.
Data Source
AI summary
An access control method and system for packet data network, Policy and Charging Rules Function (PCRF) entity, the method includes: a policy and charging rules function entity receiving an indication of gateway control session establishment from a bearer binding and event report function entity, wherein the indication of gateway control session establishment carries a session identifier, and the session identifier is used to identify whether a user equipment accesses the same packet data network again or the bearer binding and event report function entity relocation occurs; the policy and charging rules function entity receiving the indication of gateway control session establishment, acquiring the session identifier, and judging whether the user equipment accesses the same packet data network again or the bearer binding and event report function entity relocation occurs according to the session identifier.