Wireless Device Power Saving via Dynamic BWP Scheduling
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Solution Overview
Problem
Current wireless communication systems face challenges in optimizing power saving operations and wake-up procedures in multicarrier communication systems, particularly in managing bandwidth parts and dynamic power states to enhance efficiency and reduce energy consumption.
Innovation Solution
The implementation of advanced radio access network architectures and protocols that allow for dynamic bandwidth part management, power state adaptation, and efficient wake-up procedures, utilizing techniques such as Bandwidth Part (BWP) configuration and dynamic power state changes, along with innovative signaling mechanisms like DCI formats and MAC control elements, to optimize resource allocation and power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous monitoring of downlink data is performed to ensure data reception, then data transmission reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) where the wireless device alternates between active monitoring periods and sleep periods. During DRX cycles, the device monitors downlink control channels only during designated wake-up intervals and enters low-power state during non-monitoring periods, thereby reducing power consumption while maintaining data reception capability through periodic activation.
Solution Approach 2:
The network configures the wireless device with autonomous DRX parameters including on-duration, inactivity timer, and retry counters. The device autonomously manages its own power states by activating reception only when necessary based on these pre-configured parameters, eliminating the need for continuous network-controlled power management and enabling self-service power optimization.
2Speed
If the wireless device remains in active state to quickly receive data, then data reception speed is improved, but power consumption increases
Solution Approach 1:
The network pre-configures the wireless device with DRX parameters including on-duration timers and inactivity timers before data transmission. These preliminary configurations enable the device to quickly activate to the active state when data arrives, reducing wake-up latency while maintaining power savings during idle periods. The device is already prepared with the necessary timing information to rapidly transition from sleep to active state.
Solution Approach 2:
The patent implements dynamic state transitions where the wireless device flexibly switches between active and sleep states based on real-time data arrival conditions. The DRX mechanism allows the device to adapt its reception behavior dynamically - remaining active when data is present and transitioning to sleep when no data is received, optimizing the balance between reception speed and power consumption according to actual traffic conditions.
3Loss of time
If the wireless device wakes up frequently to check for data, then data reception timeliness is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic DRX cycles with configurable on-duration periods during which the device wakes up to monitor for data. By carefully tuning the period and on-duration parameters, the system achieves data reception timeliness within acceptable bounds while minimizing the frequency of wake-ups to conserve power. The periodic nature allows the device to sleep for extended intervals between scheduled wake-up times.
Solution Approach 2:
The network dynamically adjusts DRX parameters including on-duration length, inactivity timer values, and periodicity based on traffic patterns and service requirements. By changing these parameters, the system optimizes the balance between timeliness and power consumption - extending on-duration for delay-sensitive traffic while using longer sleep intervals for delay-tolerant traffic, thereby adapting power consumption to actual service needs.
4Measurement precision
If the wireless device monitors all bandwidth parts continuously, then resource allocation accuracy is improved, but power consumption increases
Solution Approach 1:
The patent divides the total bandwidth into multiple bandwidth parts (BWPs), each potentially active during different DRX cycles. Instead of continuously monitoring all BWPs, the wireless device selectively activates and monitors only the currently configured active BWP during each DRX on-duration. This segmentation allows the device to reduce monitoring scope during sleep periods while maintaining accurate resource allocation awareness during active periods.
Solution Approach 2:
The wireless device periodically activates to monitor downlink control channels on the active BWP during DRX on-duration intervals. During these periodic activation periods, the device performs comprehensive monitoring to ensure accurate resource allocation detection. Between activations, the device enters sleep mode without monitoring, accepting that resource allocation updates will be detected only at the next scheduled wake-up time, thereby balancing monitoring accuracy with power savings.
Data Source
AI summary
A wireless device may receive configuration parameters indicating a minimum scheduling offset value of a bandwidth part (BWP). The minimum scheduling offset value may be a minimum value of one or more possible scheduling offset values, in the time domain, between downlink control information (DCI) and a downlink data channel schedulable by the DCI. The wireless device may receive a first DCI comprising a BWP index of the BWP and a field indicating to apply the minimum scheduling offset value. The wireless device may receive a second DCI indicating a scheduling offset value between the second DCI and a downlink data channel scheduled by the second DCI. The scheduling offset value may be greater than, or equal to, the minimum scheduling offset value based on the field.