Uplink Packet QoS Flow Mapping for Wireless Communication
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and 5G networks, there is a challenge in transmitting uplink packets that do not match any Quality of Service (QoS) flow rules, leading to delays as user equipment (UE) must wait for QoS rules to be requested and received, which is problematic for urgent packets.
Innovation Solution
The method involves the UE mapping IP flows to QoS flows using default or pre-authorised QoS rules, and if no match is found, using a special QoS Flow ID to transmit packets through a default Data Radio Bearer (DRB), allowing for immediate transmission without waiting for additional QoS rule requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for QoS rules to be requested and received before transmitting uplink packets, then QoS management accuracy is improved, but transmission delay increases
Solution Approach 1:
The network side performs preliminary actions by pre-configuring QoS rules and default DRB mappings before uplink packet transmission is needed. When packets arrive at the UE, the mapping relationship is already established, eliminating the need for real-time QoS rule requests and responses, thus resolving the contradiction between QoS management accuracy and transmission delay
Solution Approach 2:
The patent introduces an intermediary mechanism where the network side maintains a default DRB mapping table that acts as a mediator between uplink packets and QoS flows. This intermediary allows packets to be quickly routed using pre-established mappings without requiring real-time QoS rule negotiation, thereby reducing transmission delay while maintaining QoS management accuracy
2Speed
If the UE uses default QoS rules for all packets, then transmission speed is improved, but QoS differentiation capability deteriorates
Solution Approach 1:
The patent segments the QoS handling mechanism into two parts: default QoS rules for general packets and specific QoS rules for differentiated services. The network side configures both types of rules, allowing the UE to use default rules for immediate transmission while maintaining the capability for QoS differentiation when specific rules are applicable, thus resolving the contradiction between transmission speed and QoS differentiation capability
Data Source
Figure 1~2A
Figure 2B
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AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for transmitting UL packet based on QoS flow in wireless communication system, the method comprising: receiving uplink (UL) packet from an upper layer; checking whether a IP flow of the UL packet is matched to any of UL IP flow to QoS flow mapping defined in QoS rules configured to the UE; setting a QoS Flow ID of the UL packet to a special value if a IP flow of the UL packet is not matched to any of UL IP flow to QoS flow mapping defined in the QoS rules configured to the UE; and transmitting the UL packet with the QoS Flow ID set to the special value to a network via a DRB.