Low-Power Wake-Up Signalling for SPS Resource Activation
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Solution Overview
Problem
The integration of low-power wake-up signals (LP-WUS) with other power-saving techniques in 3GPP NR is not well-defined, leading to significant latency in waking up user equipment (UE) for urgent traffic, particularly in ultra-reliable low-latency communications (URLLC) and extended reality (XR), and the integration with pre-configured resource allocations like Semi-Persistent Scheduling (SPS) is unclear.
Innovation Solution
A network device generates an LP-WUS containing activation or deactivation information for resource allocations, allowing UEs to timely activate or deactivate these resources without additional signaling, thereby reducing latency and optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE activates main radio components after detecting LP-WUS, then wireless communications can be established, but significant latency is introduced for latency-sensitive traffic
Solution Approach 1:
The patent applies preliminary action by pre-configuring resource allocations (such as SPS - semi-persistent scheduling) before the UE needs to wake up. The network device configures these resources in advance, so when the LP-WUS is detected, the UE can immediately utilize the pre-configured resources without going through complex setup procedures, thereby reducing wake-up latency while maintaining communication reliability
Solution Approach 2:
The patent extracts the resource allocation configuration from the main radio activation process. By separating the resource configuration (done via RRC signaling before wake-up) from the actual wake-up event, the system allows the UE to quickly activate only the necessary components to utilize pre-configured resources, reducing the time needed to establish communication after wake-up
2Loss of time
If the UE monitors PDCCH continuously to ensure timely response, then communication latency is reduced, but power consumption increases
Solution Approach 1:
The patent segments the reception function into two parts: a low-power wake-up receiver that monitors only for wake-up signals (LP-WUS) and a main radio that handles full PDCCH monitoring. This segmentation allows the UE to maintain low power consumption during sleep mode while ensuring timely response capability when needed, as the wake-up receiver can quickly trigger the main radio to activate pre-configured resources
Solution Approach 2:
The system performs preliminary configuration of resource allocations and monitoring parameters before the UE needs to respond. By pre-configuring SPS and other resource settings, the UE can quickly transition from sleep mode to active communication without needing to monitor PDCCH continuously, thus reducing power consumption while maintaining fast response capability
3Manufacturing precision
If the network configures detailed scheduling information via RRC signaling, then resource allocation precision is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent extracts the detailed resource allocation configuration from the wake-up signaling process. By separating the configuration phase (RRC signaling with SPS setup) from the activation phase (LP-WUS transmission), the system achieves precise resource allocation without increasing wake-up signaling complexity. The detailed configuration is done in advance when the UE is in a more capable state for processing
Solution Approach 2:
The network performs preliminary configuration of resource allocations, scheduling parameters, and monitoring settings through RRC signaling before the actual wake-up event. This allows the UE to store and process this configuration information in advance, reducing the complexity of processing during the critical wake-up phase while maintaining precise resource allocation control
Data Source
AI summary
The present disclosure relates to low-power wake-up signalling for wireless communications. A network device is configured to generate and send a low-power wake-up signal (LP-WUS) to one or more user devices. The LP-WUS comprises activation and/or deactivation information for activating or deactivating one or more resource allocations. In response to receiving the LP-WUS, a user device in a power-saving mode (or sleeping mode) is configured to wake up, and activate or deactivate one or more resource allocations for communication. The resource allocations may be semi-persistently configured through semi-persistent scheduling (SPS). In this way, the coexistence of LP-WUS monitoring and pre-configured resource allocations (e.g., SPS assignments) are harmonized. The power consumption of the user device can be reduced, and traffic latency can be improved.