XR Traffic DRX Power Saving With Non-Integer Cycles
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Solution Overview
Problem
Existing power saving mechanisms for extended reality (XR) traffic in wireless communication systems face challenges due to non-integer periodicity of XR traffic, SFN wraparound mismatch, and variable arrival bursts with jitter, leading to inefficiencies and increased power consumption.
Innovation Solution
Implementing a DRX mechanism with non-integer DRX cycles, dynamic DRX start timing adjustments based on reference SFN, and subset-based PDCCH monitoring to align with XR traffic patterns, along with delayed inactivity and retransmission timers for power-efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional integer-based DRX cycles are used, then the system maintains simple configuration and operation, but it cannot align with non-integer periodicity of XR traffic patterns leading to increased power consumption
Solution Approach 1:
The patent changes the DRX cycle parameter from integer-based to non-integer based configurations, allowing the DRX cycle to be expressed as a fraction (numerator and denominator) to match the non-integer periodicity of XR traffic patterns. This enables better alignment between DRX wake-up times and actual traffic arrivals, reducing unnecessary wake-ups and power consumption.
Solution Approach 2:
The patent introduces dynamic adjustment mechanisms where the network can configure different DRX parameters (cycle length, on-duration, offset) based on varying XR traffic conditions. The system can adaptively change DRX configurations to match changing traffic patterns, making the power saving mechanism more effective under different operational conditions.
2Use of energy by moving object
If DRX cycles are aligned with non-integer XR traffic periodicity, then power consumption is reduced, but timing synchronization issues arise due to SFN wraparound mismatch
Solution Approach 1:
The patent addresses SFN wraparound issues by introducing an extended offset mechanism that operates in an additional time dimension beyond the standard SFN cycle. This allows the system to maintain correct timing alignment even when SFN wraps around, ensuring reliable synchronization while maintaining non-integer DRX cycle benefits.
3Reliability
If the UE monitors PDCCH throughout the entire on-duration window, then no data is missed, but power consumption increases due to continuous monitoring
Solution Approach 1:
The patent segments the on-duration window into multiple monitoring occasions or subsets, where the UE only needs to monitor specific portions rather than the entire window. This segmentation allows the system to reduce monitoring effort and power consumption while still capturing all relevant data transmissions by strategically placing monitoring points.
Solution Approach 2:
The patent implements partial monitoring where the UE monitors only a subset of the on-duration window rather than the full duration. By carefully selecting which portions to monitor based on traffic patterns and scheduling information, the system achieves adequate data reception reliability with reduced power consumption.
Data Source
AI summary
Embodiments of the subject application relate to methods and apparatuses of a power saving mechanism for extended reality (XR) traffic. According to an embodiment of the subject application, a user equipment (UE) includes a processor and a transceiver coupled to the processor; and the processor is configured to: receive a first configuration for one or more serving cells in a discontinuous reception (DRX) group via the transceiver from a network, wherein the first configuration includes at least one of: DRX cycle information used for determining a non-integer length value of a DRX cycle; or DRX start offset information which indicates an offset value related to a reference system frame number (SFN) in a time domain; and determine first start timing of an on-duration window for the DRX group in the time domain according to at least one of the DRX cycle information or the DRX start offset information.