DRX Wake-Up Timing Alignment for XR Traffic Bursts
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Solution Overview
Problem
Existing wireless communication systems face timing mismatches between discontinuous reception (DRX) cycles and multimedia traffic bursts, leading to increased latency and power consumption due to misaligned wake-up times, particularly in extended reality (XR) devices with update rates like 120 Hz or 60 Hz, causing XR traffic bursts to arrive during inactive DRX periods.
Innovation Solution
Implementing a specified time offset and SFN wraparound offset to align DRX cycles with multimedia traffic bursts, using a wake-up condition that adjusts DRX ON-durations based on subframe indices and hyper frame lengths, and applying leap offsets to realign XR traffic bursts with DRX cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DRX cycles are used to save power, then power consumption is reduced, but timing mismatches cause XR traffic bursts to be missed increasing latency
Solution Approach 1:
The patent applies preliminary action by calculating and applying offsets (SFN wraparound offset and leap offset) before the DRX cycle begins. These offsets are determined in advance based on hyper frame lengths and DRX cycle configurations to pre-align the wake-up timing with expected XR traffic burst arrivals, preventing timing mismatches before they occur
Solution Approach 2:
The patent implements dynamics by making the DRX wake-up timing adjustable and adaptive. The wake-up subframe is dynamically determined using the formula: wake_up_subframe = (SFN × 10 + subframe_index + SFN_wraparound_offset + leap_offset) mod 10240, allowing the system to adapt the timing to match varying XR traffic patterns while maintaining power savings
2Reliability
If DRX ON-durations are extended to capture more traffic bursts, then traffic bursts are not missed, but power consumption increases
Solution Approach 1:
The patent replaces the mechanical approach of extending DRX ON-durations with a computational timing alignment system. Instead of keeping the receiver active longer, the system uses offset calculations and modular arithmetic to precisely align brief wake-up periods with traffic burst arrivals, achieving reliable reception with minimal active time
Solution Approach 2:
The patent changes the timing parameters of the DRX cycle by introducing adjustable offsets (SFN wraparound offset and leap offset) that modify the wake-up subframe calculation. This allows precise tuning of the wake-up timing to match traffic patterns without changing the overall DRX cycle structure or extending active durations
3Device complexity
If standard DRX timing is used, then device complexity is low, but timing mismatches occur between DRX cycles and XR traffic bursts
Solution Approach 1:
The patent introduces intermediary offset parameters (SFN wraparound offset and leap offset) that act as mediators between the standard DRX timing structure and the XR traffic burst patterns. These offsets serve as adjustment variables that reconcile the fixed DRX structure with variable traffic timing without complicating the fundamental system architecture
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may wake up, starting at a subframe, based at least in part on a subframe index of a resource cycle and a system frame number (SFN) wraparound offset that accounts for accumulated lengths of a hyper frame. The UE may receive a data burst during the subframe. Numerous other aspects are described.