QoS Flow Mapping Override Bit for 5G DRB Conflict Resolution
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Solution Overview
Problem
In 5G wireless communication systems, the existing methods for temporarily changing Quality of Service (QoS) flow mapping between data radio bearers (DRBs) can lead to conflicts and inefficiencies, particularly due to the lack of clear synchronization between explicit signaling and user plane data, causing confusion in user equipment (UE) regarding the precedence of reflective or explicit mapping.
Innovation Solution
Incorporating an override bit in the user plane packet to indicate whether reflective mapping should take precedence over explicit signaling for QoS flow mapping, allowing for flexible and temporary changes in DRB prioritization without conflicting with existing mappings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If reflective mapping is used for QoS flow to DRB mapping, then flexibility and adaptability are improved, but conflicts arise with explicit signaling causing confusion in UE
Solution Approach 1:
An override bit is introduced as an intermediary element in the user plane packet to mediate between reflective mapping and explicit signaling. This bit acts as a mediator that tells the UE whether to apply reflective mapping or ignore it, thereby resolving conflicts between the two mapping methods while preserving the flexibility of reflective mapping.
Solution Approach 2:
The state of the override bit (set or cleared) changes the behavior of reflective mapping dynamically. When the override bit is set, reflective mapping is applied; when cleared, it is ignored. This parameter change mechanism allows the system to switch between mapping behaviors without changing the fundamental mapping methods, resolving conflicts adaptively.
2Reliability
If explicit signaling is used for QoS flow mapping, then clarity and reliability are improved, but temporary changes and flexibility are reduced
Solution Approach 1:
The system dynamically switches between explicit signaling and reflective mapping based on the override bit state. This dynamic mechanism allows the network to maintain clear explicit signaling for permanent mappings while enabling temporary flexible changes through reflective mapping when the override bit is set, thus combining reliability with adaptability.
Solution Approach 2:
The network performs preliminary action by setting or clearing the override bit in advance before transmitting user plane packets. This preliminary configuration ensures that the UE is pre-informed about whether to apply reflective mapping, avoiding conflicts and ensuring smooth temporary mapping changes without compromising the clarity of explicit signaling.
3Adaptability or versatility
If both explicit signaling and reflective mapping are supported, then versatility is improved, but synchronization and coordination become complex
Solution Approach 1:
The synchronization and conflict resolution logic is extracted from the UE and placed in the user plane packets through the override bit. This extraction simplifies the UE's complexity by providing clear instructions on whether to apply reflective mapping, while the network retains the versatility of supporting both explicit signaling and reflective mapping through centralized control.
Data Source
AI summary
Disclosed are apparatuses for quality of service (QoS) flow to data radio bearer (DRB) mapping override bits. An apparatus of a user equipment (UE), includes one or more data storage devices, and one or more processors operably coupled to the one or more data storage devices. The one or more data storage devices are configured to store data corresponding to mapping of QoS flows to data radio bearers. The one or more processors are configured to map one or more QoS flows to a DRB in an uplink (UL) responsive to receipt, by the UE from a cellular base station, of a user plane packet in a downlink (DL) through the DRB if an override bit of the user plane packet indicates that reflective mapping should apply.