Power-Saving Command Timing for DRX and Dormant Cell Transition
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Solution Overview
Problem
Existing wireless communication technologies face challenges in optimizing power consumption, particularly in scenarios with varying traffic loads, leading to inefficient use of resources and increased power consumption in devices and increased energy consumption in devices and increased energy consumption in wireless devices and increased energy consumption in devices and increased energy consumption in wireless communication systems.
Innovation Solution
The implementation of power saving techniques through dynamic bandwidth part (BWP) configuration and discontinuous reception (DRX) cycles, along with wake-up and go-to-sleep signals, to manage power consumption based on traffic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous reception monitoring is used to ensure reliable communication, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) where the UE periodically switches between active reception states and sleep states. The network configures DRX parameters including on-duration timer, inactivity timer, and DRX cycle length to determine when the UE should wake up to monitor PDCCH and when it can enter sleep mode, creating a periodic reception pattern that balances reliability and power consumption.
Solution Approach 2:
The network sends wake-up signals (WUS) or go-to-sleep signals before the UE needs to transition between active and sleep states. These preliminary signals allow the UE to prepare for state transitions in advance, ensuring reliable communication by waking up early enough to receive important downlink data while minimizing unnecessary wake-ups that would increase power consumption.
2Productivity
If wide bandwidth is allocated to handle high traffic loads, then data transmission capacity is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic bandwidth part (BWP) configuration where the network can switch the UE between different BWPs with different bandwidths based on traffic conditions. The network configures multiple BWPs including a first BWP with wider bandwidth for high traffic and a second BWP with narrower bandwidth for low traffic, and dynamically switches between them to match actual data transmission needs, optimizing both capacity and power consumption.
Solution Approach 2:
The patent changes the bandwidth parameter by configuring different BWP bandwidths for different traffic scenarios. The network configures BWP parameters including bandwidth, subcarrier spacing, and cyclic prefix length, and switches between pre-configured BWPs to adapt to varying traffic loads, allowing the system to use wide bandwidth only when necessary and narrow bandwidth during low traffic periods to reduce power consumption.
3Loss of time
If frequent PDCCH monitoring is performed to capture downlink data, then data reception timeliness is improved, but processing overhead and power consumption increase
Solution Approach 1:
The patent uses DRX periodic cycles where the UE monitors PDCCH only during active periods and sleeps during inactive periods. The network configures the DRX cycle length and on-duration timer to determine the periodicity of PDCCH monitoring, allowing the UE to miss some non-critical downlink data transmissions in exchange for significant power savings during sleep periods.
Solution Approach 2:
The patent introduces wake-up signals as an intermediary mechanism between the network and UE. The WUS acts as a mediator that tells the UE whether to wake up for PDCCH monitoring or remain in sleep mode. This intermediary signal reduces the number of times the UE needs to wake up and monitor PDCCH, decreasing processing overhead and power consumption while maintaining data reception timeliness for important transmissions.
Data Source
Figure 1
Figure 2A~2B
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AI summary
A wireless device receives a downlink control information (DCI) comprising a first field indicating a transition of a cell to a dormant state and a second field indicating a hybrid automatic repeat request (HARQ) feedback timing. The wireless device transmits, in response to the DCI indicating the transition and via a physical uplink control channel resource, a positive acknowledgement of a reception of the DCI at a time interval based on the HARQ feedback timing.