Enhanced Wake-Up Signal for Wireless Device Power Saving
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Solution Overview
Problem
Wireless devices continuously monitor the physical downlink control channel (PDCCH) to receive control information, leading to high power consumption, and existing wake-up signals (WUS) do not effectively reduce this consumption by allowing skipping of monitoring instances.
Innovation Solution
Implementing an enhanced wake-up signal (EWUS) that indicates to the wireless device whether it can skip one or more future WUS monitoring occasions, allowing the device to reduce power consumption by skipping unnecessary monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless devices continuously monitor the physical downlink control channel (PDCCH) to receive control information, then control information reception is ensured, but power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) cycles where the wireless device alternates between active monitoring periods and sleep periods. During DRX on durations, the device monitors PDCCH for control information, while during off durations, it enters low-power state. This periodic monitoring pattern reduces overall power consumption while ensuring control information is received when necessary.
Solution Approach 2:
The patent extracts the wake-up signal (WUS) monitoring function from continuous PDCCH monitoring. By separately monitoring for WUS in a dedicated search space before DRX on durations, the device can determine whether to activate full PDCCH monitoring or enter sleep mode, thereby reducing unnecessary power consumption while maintaining reliable control information reception.
2Use of energy by moving object
If existing wake-up signals (WUS) are used, then some power saving is achieved, but monitoring instances cannot be skipped
Solution Approach 1:
The patent introduces an enhanced wake-up signal (EWUS) that provides preliminary information about future monitoring occasions. The EWUS includes a wake-up indicator that tells the device whether to monitor or skip upcoming WUS monitoring occasions and PDCCH monitoring instances. This advance notice allows the device to pre-schedule sleep periods and skip unnecessary monitoring, further reducing power consumption beyond what traditional WUS achieves.
3Reliability
If the wireless device monitors all WUS monitoring occasions, then no control information is missed, but power consumption increases
Solution Approach 1:
The patent implements a feedback mechanism where the network determines whether the wireless device should skip monitoring based on data availability and device status. The network sends EWUS with skip indications when there is no data to transmit, allowing the device to skip monitoring occasions confidently without missing control information. This feedback-based approach balances reliability with power saving by making monitoring decisions based on actual network conditions.
Data Source
AI summary
A method for power saving, comprising: establishing a radio resource control (RRC) connection with a wireless device, transmitting, to the wireless device, configuration information indicating a discontinuous reception (DRX) cycle time, a DRX on time period, and an offset time, transmitting an enhanced wake-up signal (EWUS) monitoring occasion for a DRX cycle, the EWUS monitoring occasion based on the offset time and the DRX on time period, determining that the wireless device can skip monitoring one or more future EWUS monitoring occasions, transmitting, during a first DRX cycle, a EWUS for the wireless device during the EWUS monitoring occasion associated with the first DRX cycle, the EWUS indicating that the wireless device can skip the one or more future EWUS monitoring occasions, and skipping transmitting the EWUS to the wireless device during the one or more future EWUS monitoring occasions.