QoS Flow Relocation Priority Handling
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Solution Overview
Problem
In wireless communication systems, particularly in scenarios where independent scheduling of data radio bearers is not possible, leftover packets on old data radio bearers can be delayed due to large queues and low prioritized bit rates, with the issue exacerbated in New Radio networks due to pre-processing, which allows the terminal device to build a large number of PDUs before uplink transmission.
Innovation Solution
The solution involves temporarily adjusting prioritization parameters of the old data radio bearer to prioritize it over other bearers, ensuring that leftover packets are transmitted efficiently, and once the queue is empty, reverting the parameters to their original values, and sending an end marker to indicate the completion of the QoS flow relocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If QoS flow is relocated from old data radio bearer to new data radio bearer, then the QoS flow can be transmitted on the new bearer with better service quality, but leftover packets on the old bearer will be delayed due to large queues and low prioritized bit rate
Solution Approach 1:
The patent applies preliminary action by temporarily increasing the prioritized bit rate of the old data radio bearer before QoS flow relocation is complete. This allows leftover packets to be transmitted promptly during the transition period. The system proactively adjusts parameters to prevent delay before the issue fully manifests, ensuring smooth packet evacuation from the old bearer.
Solution Approach 2:
The patent implements dynamics by making the prioritized bit rate parameter adjustable and time-varying. The system dynamically changes the PBR of the old bearer from its normal low value to a temporarily increased value during the relocation transition, then reverts to the original value after packet evacuation is complete. This dynamic adjustment resolves the contradiction between maintaining low PBR for normal operation and preventing packet delay during transition.
2Loss of time
If prioritized bit rate of old data radio bearer is increased to transmit leftover packets, then packet delay is reduced, but the normal operation efficiency of the system deteriorates
Solution Approach 1:
The patent applies periodic action by implementing a temporary and reversible change in the prioritized bit rate. The system increases PBR only during the specific period when QoS flow relocation is in progress, then restores the original lower PBR value afterward. This periodic adjustment ensures that the high PBR is applied only when necessary for packet evacuation, not during normal continuous operation, thus resolving the contradiction between reducing delay and maintaining efficiency.
Solution Approach 2:
The patent uses dynamics to make the prioritized bit rate a flexible, context-dependent parameter rather than a fixed value. The system automatically adjusts PBR based on the operational state: high PBR during relocation transition, low PBR during normal operation. This dynamic behavior allows the system to optimize for packet delay reduction only when needed, while maintaining overall system efficiency during steady-state operation.
3Ease of manufacture
If terminal device builds large number of PDUs before uplink transmission due to pre-processing, then transmission preparation is improved, but leftover packets on old data radio bearer are more severely delayed
Solution Approach 1:
The patent applies preliminary action by proactively increasing the prioritized bit rate of the old data radio bearer before the pre-processing completes and packets are ready for transmission. This ensures that when PDUs are generated during pre-processing, they can be transmitted promptly without delay. The system anticipates the packet generation during pre-processing and prepares the transmission path in advance by boosting PBR.
Solution Approach 2:
The patent implements preliminary anti-action by counteracting the harmful effect of pre-processing before it causes delay. The system detects when pre-processing is occurring (indicated by the presence of leftover packets on the old bearer) and preemptively increases the prioritized bit rate to prevent the delay from manifesting. This anti-action neutralizes the negative impact of pre-processing on packet timing.
Data Source
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AI summary
According to an aspect, there is provided a terminal device comprising means for relocating a quality of service, QoS, flow from a first data radio bearer to a second data radio bearer. Moreover, the means are further configured, in re-sponse to the relocating, to temporarily adjust one or more prioritization parame-ters associated with the first data bearer to prioritize the first data radio bearer.