Communications Device WUS Search Space Selection for Low-Power DRX
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Solution Overview
Problem
Existing wireless communications networks face challenges in efficiently supporting a wide range of devices with different data traffic profiles while minimizing power consumption, particularly in implementing discontinuous reception techniques.
Innovation Solution
A method for determining a valid number of search spaces for a wake-up signal (WUS) during a power saving monitoring period, allowing communications devices to prioritize reception of the WUS by identifying and validating invalid search spaces, ensuring a minimum number of valid search spaces are monitored, and applying predetermined rules to adapt WUS reception based on network signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a communications device monitors all search spaces for wake-up signals during power saving monitoring periods, then the reliability of WUS reception is improved, but the power consumption increases
Solution Approach 1:
The patent applies partial action by monitoring only a subset of search spaces rather than all search spaces. The device determines a valid number of search spaces (less than the total plurality) from which WUS can be validly received, and monitors only those valid search spaces. This reduces power consumption while maintaining adequate WUS reception reliability through selective monitoring of the most promising search spaces.
2Reliability
If the communications device validates invalid search spaces to meet minimum search space requirements, then the WUS reception coverage is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-determining which search spaces are valid for WUS reception before the actual WUS monitoring process. The device identifies invalid search spaces in advance (those where WUS cannot be validly received) and excludes them from monitoring. This preliminary validation reduces the number of search spaces that need to be monitored, improving WUS reception coverage while managing device complexity through advance preparation rather than complex real-time validation.
3Use of energy by moving object
If the communications device reduces the number of monitored search spaces to save power, then the power consumption is reduced, but the loss of information increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the number of search spaces to monitor based on validity criteria. Instead of monitoring a fixed number of search spaces, the device determines a valid number of search spaces from the plurality, where only search spaces meeting specific validity conditions are monitored. This parameter adjustment ensures that monitoring effort is concentrated on search spaces with higher probability of containing valid WUS signals, reducing power consumption while minimizing information loss through intelligent selection.
Data Source
AI summary
A communications device is configured to receive in a wireless communications systems using discontinuous reception. The communications device is configured to receive by determining a valid number of search spaces from which a wake-up signal, WUS, can be validly received during a power saving monitoring period. The valid number of search spaces is one or more of a plurality of search spaces of a downlink physical control channel of a wireless access interface provided by a wireless communications network for a WUS. The power saving monitoring period can be monitored by a receiver of the communications device in a low power state, the WUS being decodable with more relaxed processing requirements, and the WUS indicating that the receiver of the communications device should be powered up to a higher power state to receive signals in a discontinuous receiving on, DRX_ON, period.