DRX Short Cadence Alignment for Low-Latency Wireless Traffic
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Solution Overview
Problem
Current wireless communication systems face challenges in aligning discontinuous reception (DRX) cycles with the periodicity of low-latency traffic, leading to misalignments and increased latency, especially in applications like extended reality where precise timing is crucial.
Innovation Solution
Implementing a short cadence value for DRX that corresponds to a number of Hertz, allowing user equipment (UE) to wake up at specific subframes or slots based on a DRX short cadence value and identifier, thereby aligning with the periodicity of traffic bursts, and enabling more granular timing adjustments to reduce latency and conserve power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional DRX cycles are used with fixed timing, then power consumption is reduced through extended sleeping periods, but latency increases due to misalignment with traffic burst periodicity
Solution Approach 1:
The patent applies dynamics by making the DRX cycle duration variable rather than fixed. The network can dynamically adjust the DRX cycle length based on traffic conditions, allowing the UE to switch between shorter cycles (for low latency) and longer cycles (for power savings). This is achieved through network signaling that configures multiple DRX cycle options and triggers transitions between them based on traffic burst detection and periodicity analysis.
Solution Approach 2:
The patent changes the timing parameters of the DRX cycle to align with traffic burst periodicity. By analyzing the periodicity of downlink traffic bursts and adjusting the DRX cycle timing accordingly, the system ensures that UE wake-up occasions coincide with expected traffic arrivals. This parameter adjustment reduces latency while maintaining power efficiency, as the UE sleeps during periods without traffic and wakes only when traffic is likely to arrive.
2Loss of time
If DRX cycle timing is adjusted to align with traffic periodicity, then latency is reduced, but system complexity increases due to periodicity detection and dynamic configuration
Solution Approach 1:
The patent implements self-service by enabling the network to automatically detect traffic periodicity and self-configure appropriate DRX cycle parameters without manual intervention. The network monitors downlink traffic patterns, identifies periodicity characteristics, and autonomously adjusts DRX cycle timing and duration to match the detected traffic patterns. This self-adjusting mechanism reduces latency while keeping operational complexity manageable through automation.
Solution Approach 2:
The patent uses feedback mechanisms where the network continuously monitors traffic burst patterns and uses this information to adjust DRX cycle configurations. By detecting the periodicity of downlink traffic and feeding this information back into the DRX parameter selection process, the system dynamically optimizes timing alignment. This feedback loop enables automatic adaptation to changing traffic conditions while maintaining relatively simple system architecture.
3Speed
If shorter DRX cycles are used to reduce latency, then responsiveness to traffic bursts improves, but power consumption increases due to more frequent wake-ups
Solution Approach 1:
The patent applies dynamics by implementing variable DRX cycle lengths that adapt to traffic conditions. Instead of using consistently short cycles that would increase power consumption, the system uses short cycles only when traffic bursts are detected and requires fast responsiveness. During periods of low or no traffic, the system transitions to longer DRX cycles, allowing the UE to sleep longer and conserve power. This dynamic adjustment maintains responsiveness when needed while minimizing power consumption during idle periods.
Solution Approach 2:
The patent uses periodic action by aligning DRX wake-up occasions with the periodicity of traffic bursts. Rather than using fixed short intervals regardless of traffic patterns, the system detects the actual periodicity of downlink traffic and schedules wake-ups to coincide with these periodic arrivals. This ensures that the UE is awake and responsive precisely when traffic is expected to arrive, maintaining high responsiveness while avoiding unnecessary wake-ups that would consume power during inter-traffic intervals.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may obtain a discontinuous reception (DRX) short cadence value that corresponds to a number of Hertz (Hz). The UE may sleep as part of a DRX cycle. The UE may wake up, starting at a subframe, based at least in part on the DRX short cadence value and a subframe identifier of the subframe. Numerous other aspects are described.