LP-WUS Coverage Adaptation for Low-Power UE Wakeup
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Solution Overview
Problem
The challenge in wireless communication systems is that low power wakeup signals (LP-WUS) have a limited range, which can lead to increased power consumption and latency when user equipment (UE) moves outside this range while still being within the range of the control channel signal, as the UE cannot rely on LP-WUS to trigger control channel monitoring.
Innovation Solution
The UE detects when it is outside the LP-WUS range and informs the network node, allowing the network node to adapt the LP-WUS configuration, such as increasing transmission resources or power, or disabling PDCCH monitoring, to ensure efficient power savings and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE uses LP-WUS to trigger control channel monitoring, then power consumption is reduced, but latency increases when the UE moves outside the LP-WUS range
Solution Approach 1:
The system dynamically adapts the LP-WUS configuration based on UE mobility state and coverage range. When UE is detected to be outside LP-WUS range, the network node adjusts parameters such as increasing transmission power, changing resource allocation, or switching to alternative wake-up mechanisms, thereby optimizing the balance between power consumption and latency according to real-time conditions
Solution Approach 2:
The network node changes LP-WUS configuration parameters (transmission power, resource allocation, monitoring frequency) based on UE location and mobility characteristics. This allows the system to maintain effective wake-up signaling for mobile UEs while preserving the power-saving benefits for stationary or slow-moving UEs within coverage range
2Use of energy by moving object
If the UE relies on LP-WUS for wake-up signaling, then power savings are achieved, but reliability decreases when outside coverage range
Solution Approach 1:
The system implements feedback mechanisms where the network node monitors UE connectivity status and LP-WUS reception quality. When UE moves outside coverage range, the feedback triggers adaptive responses such as switching to main radio monitoring, adjusting transmission parameters, or notifying the UE to activate alternative wake-up methods, thereby maintaining reliability while preserving power savings
Solution Approach 2:
The network node acts as an intermediary that coordinates between LP-WUS reception and alternative wake-up mechanisms. It monitors the effectiveness of LP-WUS and introduces intermediate solutions (such as adjusted configuration or hybrid approaches) to maintain reliable wake-up signaling when UE is partially outside coverage range
3Area of stationary object
If the network node transmits LP-WUS with higher power to extend range, then coverage is improved, but energy consumption by the network increases
Solution Approach 1:
The network divides coverage area into different zones (in-range and out-of-range) and applies different transmission strategies. For UEs within standard LP-WUS range, normal power levels are used. For UEs outside range, the system segments the problem by using alternative wake-up mechanisms or targeted higher-power transmissions only when necessary, rather than continuously transmitting at high power across the entire network
Data Source
AI summary
Various aspects of the present disclosure generally relate to adapting a low power wakeup signal (LP-WUS) configuration when a user equipment (UE) is outside an LP-WUS range. For example, the network node may transmit at least one LP-WUS in every LP-WUS transmission occasion, such that a UE may detect that the UE is outside the LP-WUS range if no LP-WUS is received in a threshold quantity of LP-WUS monitoring occasions. Additionally or alternatively, the UE may detect that the UE is outside the LP-WUS range if a downlink signal measurement fails to satisfy a signal quality condition in a threshold quantity of measurement occasions. In such cases, the UE may transmit a message informing the network node, which may adapt the LP-WUS configuration accordingly. For example, the network may adapt the LP-WUS configuration to increase the LP-WUS range and/or may deactivate using the LP-WUS to trigger control channel monitoring.