Delay-Aware Logical Channel Priority for Deadline-Sensitive Uplink Data
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in managing latency and prioritization of logical channels, leading to inefficiencies in uplink transmission, especially when uplink resources are temporarily scarce and higher priority data is not due for transmission.
Innovation Solution
A method and apparatus that dynamically adjust the priority of logical channels based on the remaining time of discard timers, allowing lower priority data to be transmitted earlier if it is nearing its deadline, thereby optimizing latency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If uplink resources are allocated based on static LCH priority, then resource allocation is simple and deterministic, but latency performance deteriorates when lower priority data approaches its deadline
Solution Approach 1:
The patent implements dynamic LCH priority adjustment where the priority of a logical channel can change based on the remaining time of its discard timer. When the remaining time falls below a threshold, the LCH priority is adjusted to allow earlier transmission, transforming the static priority system into a dynamic one that adapts to timing constraints
Solution Approach 2:
The patent changes the priority parameter of logical channels based on the remaining time of discard timers. By monitoring the remaining time and adjusting the priority parameter when it falls below a threshold, the system optimizes transmission timing without requiring complete reconfiguration of the priority structure
2Reliability
If higher priority LCH data is transmitted first, then priority ordering is maintained, but lower priority data may miss its deadline when uplink resources are temporarily scarce
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the remaining time of discard timers for each logical channel. This feedback information is used to dynamically adjust priorities, ensuring that data approaching its deadline can be transmitted in time while maintaining overall priority structure integrity
Data Source
AI summary
Method and apparatus for an enhanced delay-aware logical channel procedure. The apparatus identifies a first remaining time of a first discard timer associated with a first delay budget for at least a first PDU that falls below a threshold for an associated first LCH. The apparatus adjusts an LCH priority for the at least the first PDU in response to the remaining time falling below the threshold based at least on a second remaining time of a second discard timer associated with a second delay budget of a target LCH having a next higher priority than the first LCH. The apparatus transmits an uplink transmission based on an adjusted LCH priority for the at least the first PDU.