Active BWP Switching for Power-Saving DRX in Wireless Cells
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Solution Overview
Problem
Existing wireless communication systems face challenges in optimizing power consumption and efficiency, particularly in managing bandwidth parts (BWPs) and discontinuous reception (DRX) operations, leading to suboptimal battery life and performance in wireless devices.
Innovation Solution
Implementing a power-saving active BWP (PS-active BWP) mechanism that dynamically adjusts bandwidth and reception states based on device activity, utilizing wake-up signals and dormant states to minimize unnecessary power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device operates in a connected state with active bandwidth parts, then communication performance is maintained, but power consumption increases
Solution Approach 1:
The patent implements dynamic BWP management where the network can activate or deactivate specific bandwidth parts based on traffic conditions. The wireless device transitions between different BWP states (active, dormant, inactive) to adapt power consumption to actual communication needs, maintaining performance when required while saving power during low-activity periods
Solution Approach 2:
The patent employs Discontinuous Reception (DRX) cycles where the wireless device periodically wakes up to monitor control channels and then returns to a low-power state. This periodic activation allows the device to maintain connection readiness while significantly reducing average power consumption during idle periods within each DRX cycle
2Productivity
If the wireless device continuously monitors control channels, then data reception readiness is maintained, but battery life decreases
Solution Approach 1:
The patent implements DRX operation where the wireless device monitors control channels only during specific wake-up periods within each DRX cycle. During the majority of the cycle, the device remains in a low-power state with minimal monitoring, thereby extending battery life while maintaining the ability to quickly resume data reception when needed
Solution Approach 2:
The patent applies partial monitoring by configuring the wireless device to monitor only a subset of control channel opportunities rather than continuously. The device monitors control channels at reduced frequency or with reduced scope during dormant states, providing sufficient data reception readiness for typical traffic patterns while conserving battery energy
3Productivity
If the wireless device maintains wide bandwidth allocation, then data transmission capacity is improved, but power consumption increases
Solution Approach 1:
The patent divides the total system bandwidth into multiple separate bandwidth parts (BWPs). The wireless device is configured with multiple BWPs of different sizes and can be instructed to activate only the necessary portions based on current traffic requirements. This segmentation allows the device to maintain high data capacity when needed while consuming less power during low-bandwidth scenarios
Solution Approach 2:
The patent enables different BWPs to have different characteristics (sizes, frequency locations, configurations) optimized for specific traffic types. The network can activate specific BWPs with appropriate qualities for current needs rather than maintaining a single wide bandwidth allocation, thereby matching power consumption to actual data transmission requirements
Data Source
AI summary
A wireless device receives configuration parameters indicating a non-dormant bandwidth part (BWP) for transitioning to a non-dormant state of a cell. The wireless device activates a first BWP as an active BWP in response to activation of the cell. The wireless device activates the non-dormant BWP as the active BWP in response to transitioning the cell from a dormant state to the non-dormant state.