Power Saving Bitmap for Secondary Cell Wake-Up
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Solution Overview
Problem
Current wireless communication systems face challenges in optimizing wake-up procedures and power saving operations in multicarrier communication systems, particularly in managing radio resources and beam management across multiple cells and beams, which affects efficiency and battery life.
Innovation Solution
The implementation of advanced radio access network architectures and protocols, including dynamic bandwidth adaptation, multi-beam operations, and efficient wake-up channel management, enables optimized wake-up procedures and power saving strategies by dynamically configuring bandwidth parts and resource allocation across multiple cells and beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous monitoring of multiple cells and beams is performed to maintain reliable communication, then connection reliability is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the monitoring state of the wireless device based on traffic conditions and beam quality. The device transitions between active monitoring and sleep states, adapting its behavior to current network conditions rather than continuously monitoring all cells and beams, thus reducing power consumption while maintaining reliability when needed.
Solution Approach 2:
Instead of continuous monitoring, the patent implements periodic monitoring with configurable intervals. The wireless device monitors wake-up signals and downlink communications at specific periods, allowing it to maintain connection reliability through regular checks while significantly reducing power consumption compared to continuous monitoring.
2Reliability
If the wireless device monitors all configured cells and beams for wake-up signals, then wake-up reliability is improved, but processing complexity and power consumption increase
Solution Approach 1:
The patent extracts and monitors only the essential wake-up signal characteristics from the multiple cells and beams. Instead of processing all possible signals simultaneously, the device focuses on detecting specific wake-up signal patterns and parameters, reducing processing complexity while maintaining wake-up reliability through targeted monitoring of key signal features.
Solution Approach 2:
The system implements partial monitoring by focusing on a subset of configured cells and beams that are most likely to contain wake-up signals. The wireless device monitors selected beams with higher probability or priority, achieving adequate wake-up reliability without the excessive processing burden of monitoring all possible beams equally.
3Speed
If the wireless device remains in active state to quickly respond to downlink communications, then response speed is improved, but battery life decreases
Solution Approach 1:
The wireless device alternates between active and sleep states in periodic cycles. During sleep periods, the device conserves battery power by minimizing monitoring activities. When a wake-up signal is detected or downlink data is expected, the device transitions to active state to quickly respond to communications, thus achieving a balance between battery life and response speed through time-based state transitions.
Solution Approach 2:
The system uses preliminary wake-up signals to prepare the wireless device for upcoming downlink communications. The wake-up signal triggers the device to transition from sleep to active state in advance of the actual data transmission, ensuring quick response capability while allowing the device to remain in low-power state during periods when no communication is expected, thereby extending battery life.
Data Source
AI summary
A wireless device receives one or more radio resource control message comprising configuration parameters of a plurality of cells. An activation command indicating activation of a plurality of secondary cells (SCells) of the plurality of cells is received. A first downlink control information (DCI), comprising a power saving indication bitmap, is received. Each bit of the power saving indication bitmap indicates whether to monitor a downlink control channel on a corresponding activated SCell of the plurality of SCells. The wireless device starts monitoring a downlink control channel of an activated SCell of the activated SCells, in response to a bit, of the power saving indication bitmap, corresponding to the activated SCell, indicating monitoring the downlink control channel. A second DCI is received via the downlink control channel.