Uplink PDR Generation for Reflective QoS Packet Mapping
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Solution Overview
Problem
In existing communication technologies, the lack of uplink service data flow (SDF) information in policy and charging control (PCC) rules leads to the SMF network element failing to generate an uplink packet detection rule (PDR), resulting in incorrect mapping of uplink data packets to QoS flows and potential packet discard.
Innovation Solution
The session management network element generates uplink PDRs based on downlink PDRs and SDF information, using reflective quality of service control (RQC) indications to ensure correct mapping of uplink data packets to QoS flows, and implements usage reporting rules (URR) to manage PDRs dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the PCF network element generates a PCC rule including an RQC indication without uplink SDF information, then the signaling overhead between SMF and terminal device is reduced, but the UPF network element cannot map uplink data packets to correct QoS flows resulting in packet discard
Solution Approach 1:
The SMF network element proactively generates uplink PDRs based on downlink PDRs and SDF information before uplink data packets arrive. This preliminary action ensures that the UPF network element has the necessary packet detection rules in place to correctly map uplink packets to QoS flows, preventing packet discard while maintaining reflective QoS control
Solution Approach 2:
The patent introduces an intermediary mechanism where the SMF network element acts as a mediator between the PCF network element and the UPF network element. The SMF translates the downlink PDR information into uplink PDRs and delivers them to the UPF, enabling the UPF to perform correct packet detection and mapping without requiring direct uplink SDF information from the PCF
2Reliability
If the SMF network element generates uplink PDRs based on downlink PDRs, then correct mapping of uplink data packets to QoS flows is achieved, but the complexity of the SMF network element increases
Solution Approach 1:
The SMF network element generates uplink PDRs by copying and adapting information from downlink PDRs. Instead of creating entirely new packet detection rules, the SMF replicates the essential characteristics of downlink PDRs to form uplink PDRs, significantly reducing the complexity of the generation process while ensuring accurate packet mapping
Data Source
AI summary
Embodiments of this application provide an uplink PDR generation method, an apparatus, and a system, to resolve a problem in a conventional technology that an uplink data packet may be discarded because a PCF network element may not include uplink SDF information when generating a PCC rule including an RQC indication. The method includes: A session management network element receives a first policy and charging control PCC rule from a policy control network element, where the first PCC rule includes downlink service data flow SDF information that corresponds to a first service. When the first PCC rule includes a reflective quality of service control RQC indication, the session management network element generates, according to the first PCC rule, a first uplink PDR that corresponds to the first service. The session management network element sends, to a user plane network element, the first uplink PDR that corresponds to the first service.