Delay-State Switching for UE Uplink Budget Compliance
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in managing uplink delays that exceed predefined budgets, leading to suboptimal performance in latency-sensitive applications like extended reality (XR), as base stations lack real-time awareness of uplink delays at user equipment (UE).
Innovation Solution
User equipment (UE) transmits a delay status report (DSR) when uplink delays exceed a threshold, switching to a 'delay critical' configuration to ensure timely data transmission, and the network entity adjusts its communication strategy to prioritize resources for UEs nearing their delay budget.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station uses conventional scheduling without real-time delay awareness, then the system complexity is reduced, but the uplink delay budget cannot be guaranteed for latency-sensitive applications
Solution Approach 1:
The patent implements a feedback mechanism where the UE monitors uplink delay and sends delay status reports to the base station when delay exceeds a threshold. The base station uses this feedback information to adjust scheduling decisions, enabling delay budget compliance through real-time awareness without requiring complex base station-side delay monitoring
Solution Approach 2:
The UE performs self-service by autonomously monitoring its own uplink delay status and triggering delay status reports when needed. This shifts the delay monitoring function from the base station to the UE, reducing base station complexity while maintaining delay awareness for scheduling decisions
2Reliability
If the UE continuously monitors and reports uplink delay status, then the delay budget compliance is improved, but the signaling overhead and energy consumption increase
Solution Approach 1:
Instead of continuous delay monitoring and reporting, the patent implements partial action by only triggering delay status reports when the delay exceeds a predefined threshold. This reduces energy consumption and signaling overhead while maintaining sufficient delay awareness for scheduling decisions
Solution Approach 2:
The delay status reporting is implemented as a periodic or event-triggered action rather than continuous monitoring. The UE checks delay status at specific intervals or when threshold conditions are met, reducing energy consumption while maintaining delay budget compliance
3Loss of time
If the UE switches to delay critical state configuration, then the uplink data transmission timeliness is improved, but the device complexity increases
Solution Approach 1:
The patent implements dynamic state switching where the UE transitions between normal and delay critical state configurations based on real-time delay status. This allows the device to optimize transmission timeliness by activating delay-critical optimizations only when needed, rather than maintaining fixed complex configurations at all times
Solution Approach 2:
The UE changes operational parameters by switching between different state configurations (normal vs. delay critical). This parameter change approach allows the device to adapt transmission behavior to current delay conditions, improving timeliness while managing complexity through configuration switching rather than complex real-time adjustments
Data Source
AI summary
Method and apparatus for delay states having variable configurations. The apparatus transmits, to a network entity, a delay status report indicating an uplink delay detected by the UE, wherein the uplink delay is greater than a first threshold. The apparatus switches, subsequent to transmitting the delay status report, from a first state configuration to a second state configuration that is different than the first state configuration for transmission of uplink data before a delay budget is exceeded. The second state configuration is a delay critical state and comprises a set of configurations for the transmission of the uplink data. The apparatus communicates, with the network entity, based on the second state configuration.