Wake-up Signal and Receiver for IoT Power Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face inefficiencies in minimizing resource usage for machine-type-communication (MTC) and Internet of Things (IoT) applications, where devices often require frequent wake-ups to monitor control channels, leading to increased power consumption and overhead.
Innovation Solution
A method and apparatus for a user equipment (UE) to periodically awaken and monitor for a wake-up signal (WUS) of shorter length than control channel communications, allowing it to determine whether to fully awaken for control channel monitoring, utilizing a wake-up receiver (WUR) to reduce power consumption and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE frequently wakes up to monitor control channels, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The monitoring function is segmented into two stages: a brief wake-up signal detection phase (shortened PDCCH monitoring) and a full control channel monitoring phase. The UE only performs the shortened monitoring when wake-up signals are detected, avoiding full monitoring during periods without data, thus reducing power consumption while maintaining communication reliability.
Solution Approach 2:
The system performs preliminary action by sending wake-up signals before requiring full control channel monitoring. The UE detects these preliminary wake-up signals during shortened monitoring periods, and only proceeds to full monitoring when necessary, preventing unnecessary power consumption while ensuring reliable communication when data is present.
2Reliability
If a UE monitors control channels frequently, then data transmission reliability is improved, but resource usage increases
Solution Approach 1:
The control channel monitoring resource is segmented into a minimal wake-up signal monitoring phase and a full control channel monitoring phase. The UE allocates monitoring resources dynamically based on wake-up signal detection, using minimal resources during idle periods and full resources only when data transmission is anticipated, thus optimizing resource usage while maintaining reliability.
Solution Approach 2:
The system applies partial action by performing only shortened PDCCH monitoring (partial monitoring) when wake-up signals are not detected, and full monitoring (excessive action relative to minimum needed) only when wake-up signals indicate potential data transmission. This dynamic adjustment optimizes resource usage while ensuring data transmission reliability when needed.
3Use of energy by moving object
If the PDCCH monitoring duration is shortened, then power consumption is reduced, but detection capability deteriorates
Solution Approach 1:
The detection process is segmented into two levels: a first level of shortened PDCCH monitoring with reduced time duration for basic wake-up signal detection, and a second level of full PDCCH monitoring for comprehensive data detection. This segmentation allows the system to use minimal detection capability when idle (saving power) while maintaining full detection capability when data transmission is indicated.
Solution Approach 2:
The shortened PDCCH monitoring serves as a preliminary detection stage to identify potential wake-up events. When wake-up signals are detected in this preliminary stage, the system then performs full PDCCH monitoring to confirm and process the actual data transmission, ensuring detection capability is fully applied only when necessary.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for communication includes a user equipment (UE) periodically awakening to monitor for a wake-up signal (WUS) in a wake-up signal search space, the wake-up signal having a shorter length than a length of a control channel communication to allow the UE to determine whether the UE should monitor for the control channel communication.