Adaptive BWP Switching for XR Power Saving
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Solution Overview
Problem
Current wireless communication technologies, such as 5G NR and LTE, face challenges in power saving, particularly for high-traffic services like extended reality (XR) that require low latency and high reliability, as existing power-saving techniques like connected discontinuous reception (C-DRX) are not optimized for these demanding applications.
Innovation Solution
The implementation of adaptive bandwidth part (BWP) switching, where a user equipment (UE) or base station configures and switches between different BWP configurations tailored for lower and higher traffic rates, optimizing power consumption by adjusting monitoring periodicity, control-channel-to-data-channel delay, and antenna usage based on traffic demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If connected discontinuous reception (C-DRX) is used for power saving, then power consumption is reduced, but latency increases and reliability deteriorates for high-traffic services
Solution Approach 1:
The patent implements dynamic BWP switching that adapts the bandwidth configuration based on real-time traffic conditions. The UE switches between a first BWP (optimized for power saving) and a second BWP (optimized for high-performance services) depending on whether high-traffic services like XR are detected, allowing the system to dynamically adjust between power efficiency and service reliability
Solution Approach 2:
The patent changes key communication parameters by switching BWPs: the first BWP uses larger subcarrier spacing and longer cyclic prefix for power efficiency, while the second BWP uses smaller subcarrier spacing and shorter cyclic prefix for low latency and high reliability. This parameter adaptation resolves the contradiction by selecting appropriate parameters based on service requirements
2Productivity
If bandwidth is increased to support high traffic rates, then data rate increases, but power consumption increases
Solution Approach 1:
The patent segments the total bandwidth into multiple BWPs with different configurations. The first BWP is segmented for power-saving operations with reduced bandwidth activation, while the second BWP is segmented for high-data-rate operations. This segmentation allows the UE to activate only the necessary bandwidth portion based on current traffic demands, resolving the contradiction between data rate and power consumption
Solution Approach 2:
The patent implements periodic monitoring of traffic conditions and periodic switching between BWPs. The UE periodically evaluates whether high-traffic services are present and switches between the first (power-saving) and second (high-performance) BWPs accordingly, allowing the system to alternate between low-power and high-data-rate states based on periodic traffic assessment
3Use of energy by moving object
If monitoring periodicity is decreased to reduce power consumption, then power saving increases, but latency increases
Solution Approach 1:
The patent dynamically adjusts monitoring periodicity by switching BWPs: the first BWP uses decreased monitoring periodicity for power saving during low-traffic periods, while the second BWP uses increased monitoring periodicity for low latency during high-traffic periods. This dynamic adjustment resolves the contradiction by adapting monitoring frequency to current service requirements
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for wireless communication and more particularly, to techniques for bandwidth part adaptation for extended reality (XR) power saving. A method that may be performed by a UE generally includes receiving a first configuration of a first bandwidth part (BWP) and a second configuration of a second BWP, wherein the first BWP is configured for a lower traffic rate and the second BWP is configured for a higher traffic rate; obtaining an indication to switch from the first BWP to the second BWP; and switching from the first BWP to the second BWP in response to obtaining the indication.