Adaptive Wake-Up Signal Transmission Mode Selection
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Solution Overview
Problem
Wireless devices in wireless communication systems face inefficiencies in energy consumption due to frequent wake-ups during discontinuous reception (DRX) cycles, leading to wasted energy and potential data transmission misses, especially when wake-up signals (WUS) are not robustly detected, causing increased latency and radio link failures.
Innovation Solution
A method where a network node selects a wake-up signal (WUS) transmission mode based on the link quality between the network node and the wireless device, balancing robustness and resource consumption by configuring WUS transmission modes, including power levels and aggregation levels, to ensure successful detection without excessive resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If robust WUS transmission is used (higher aggregation level, higher power, multiple transmissions), then WUS detection reliability is improved, but network resource consumption increases
Solution Approach 1:
The network node dynamically adjusts WUS transmission parameters (aggregation level, power, number of transmissions) based on the determined link quality between the network node and the wireless device. When link quality is good, less robust transmission is used; when link quality is poor, more robust transmission is applied. This resolves the contradiction by making resource consumption adaptive to actual channel conditions rather than always using maximum robustness.
2Reliability
If WUS transmission is always applied, then WUS detection reliability is improved, but network resource consumption increases
Solution Approach 1:
The network node applies different WUS transmission strategies to different wireless devices based on their individual link qualities. Instead of uniformly applying robust WUS transmission to all devices, the system tailors the transmission approach to each device's specific channel conditions, thereby reducing overall network energy consumption while maintaining reliability where needed.
3Reliability
If UE monitors PDCCH frequently, then data transmission reliability is improved, but energy consumption increases
Solution Approach 1:
The system uses WUS as a preliminary indicator before actual data transmission. The WUS alerts the UE in advance that data transmission is upcoming, allowing the UE to wake up from sleep mode only when necessary. This preliminary warning mechanism reduces the need for frequent PDCCH monitoring while ensuring the UE is ready for data reception when needed, thus balancing reliability and energy consumption.
Data Source
AI summary
A network node and a method of transmitting control information to a wireless device performed by the network node. The method includes determining a wake-up signal, WUS, transmission robustness goal, determining a link quality between the network node and the wireless device, selecting a WUS transmission mode based on the robustness goal and the link quality, applying the selected WUS transmission mode such that a transmitted WUS enables the wireless device to wake up to receive control information, and transmitting the control information to the wireless device.