DRX Cycle Offset Adjustment for XR Latency
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Solution Overview
Problem
Current discontinuous reception (DRX) configurations in wireless communications are not suitable for extended reality (XR) services with non-periodic traffic patterns, leading to data transmission delays and increased latency due to misalignment between data generation periods and UE monitoring periods.
Innovation Solution
Adjusting the DRX cycle by introducing a time offset after a number of cycles, ensuring that data transmission aligns with the time data is generated, using equations such as SFNx10+subframe nr+n*traffic_time_offset modulo DRXcycle=drxstartoffset+n*traffic_time_offset modulo DRXcycle, to shift the DRX ON period and align it with data availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If standard DRX cycle is used, then energy saving is improved, but latency increases due to misalignment between data generation and UE monitoring periods
Solution Approach 1:
The patent applies dynamics by making the DRX cycle adjustable and adaptive. The network can dynamically configure different DRX cycle lengths based on the specific service requirements and traffic patterns. This allows the system to transition from a static DRX configuration to a dynamic one that can adapt to varying latency requirements while maintaining energy efficiency.
Solution Approach 2:
The patent changes the parameter of DRX cycle duration to resolve the contradiction. By allowing the DRX cycle to be configured with different values based on service requirements, the system can optimize the balance between energy saving and latency. The network can select appropriate DRX cycle lengths that match the data generation patterns of different services.
2Device complexity
If fixed DRX configuration is used, then device complexity is reduced, but adaptability to non-integer periodicity services deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring the network with the ability to adjust DRX cycles before actual data transmission begins. The network can pre-establish different DRX cycle configurations based on anticipated service requirements, allowing seamless adaptation to non-integer periodicity services without increasing operational complexity at the device level.
Solution Approach 2:
The patent makes the DRX configuration universal by enabling it to handle multiple service types with different periodicity requirements through a single adaptable framework. The network can configure DRX cycles to accommodate both traditional periodic services and XR services with non-integer periodicity, eliminating the need for service-specific dedicated configurations.
Data Source
AI summary
According to some embodiments, a method performed by a wireless device for discontinuous reception (DRX) comprises receiving a first message comprising an indication that an offset is to be used with discontinuous reception; monitoring a downlink during a first period of time associated with a preconfigured discontinuous reception cycle; determining that a first number of time periods have occurred since monitoring the downlink in the first period of time; and monitoring the downlink during a second period of time, the second period of time adjusted from the preconfigured discontinuous reception cycle based on the offset.