Wake-Up Signal Transmission Reliability in 5G Networks
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Solution Overview
Problem
Current wake-up signals (WUS) in wireless communication networks have low robustness and reliability, leading to increased energy consumption, dropped connections, and wastage of network resources due to missed detections or false alarms in 5G NR and LTE networks.
Innovation Solution
The implementation of selective wake-up signal transmission methods, including transmitting WUS as downlink control information on a physical downlink control channel, monitoring for feedback, and adjusting transmission characteristics such as aggregation level, modulation, and power to improve detection reliability, along with configuring UEs to send acknowledgment signals or periodic channel state information reports to confirm signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If wake-up signal transmission is implemented to reduce energy consumption, then energy efficiency is improved, but detection reliability deteriorates due to low robustness
Solution Approach 1:
The patent changes transmission parameters including aggregation level, modulation and coding scheme, and power level to improve WUS detection reliability. The network node selectively transmits further WUS with different aggregation levels based on whether feedback is received, adapting parameters to balance energy efficiency and reliability.
Solution Approach 2:
The patent implements feedback mechanisms where the UE sends feedback (ACK/NACK or periodic CSI reports) to confirm WUS detection. The network node monitors for this feedback and uses it to determine whether to transmit additional WUS, creating a closed-loop system that improves reliability while maintaining energy efficiency.
2Reliability
If selective transmission of further wake-up signal is implemented to improve detection reliability, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic transmission where the network node selectively transmits further WUS based on received feedback. The aggregation level, modulation scheme, and power level are dynamically adjusted according to detection conditions, allowing the system to adapt complexity to actual needs rather than using fixed complex mechanisms.
Solution Approach 2:
The system uses the UE's own feedback (ACK/NACK or periodic CSI reports) to self-regulate the transmission process. The network node automatically determines whether to transmit further WUS based on the absence or presence of feedback, eliminating the need for additional complex control signaling mechanisms.
3Reliability
If monitoring for wake-up signal feedback is implemented to enhance detection reliability, then reliability is improved, but use of network resources increases
Solution Approach 1:
The patent uses periodic channel state information reports, which are part of normal UE operations, to serve dual purposes: maintaining channel knowledge and confirming WUS detection. This multi-functional approach allows the system to monitor WUS feedback without requiring dedicated additional signaling resources.
Solution Approach 2:
The network node monitors for feedback but does not require explicit ACK/NACK for every WUS. By accepting periodic CSI reports as implicit confirmation, the system performs partial monitoring that is sufficient for reliability improvement without the full resource cost of continuous explicit feedback requirements.
Data Source
AI summary
Embodiments include methods for selective transmission of wake-up signals (WUS) to a user equipment (UE) by a network node in a RAN. Such methods include transmitting a WUS to the UE during a first occasion and, during one or more second occasions, monitoring for WUS feedback from the UE in response to the WUS. Such methods include, based on the results of the monitoring, selectively transmitting one or more further WUS to the UE during respective one or more third occasions. The WUS feedback can be received in various ways in different embodiments. In some embodiments, such methods include other operations after a predetermined number of repetitions of detecting no WUS feedback from the UE during second occasions and transmitting further WUS to the UE during third occasions. Other embodiments include complementary methods for a UE, as well as network nodes and UEs configured to perform such methods.