Wake-Up Radio System Information Update Control
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Solution Overview
Problem
User equipment (UE) experiences high power consumption during system information updating in LTE or NR systems when configured with a wake-up radio (WUR) module, due to frequent blind detection processes and synchronization issues.
Innovation Solution
A method where a base station sends a wake-up signal with system information update transmission control information to the UE, allowing the main radio interface to wake up and receive updated system information directly, reducing the need for blind detection and synchronization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main radio module undergoes three steps (reception of paging message, reception of SIB 1, and reception of SIBs 2 to 21) to update system information, then the system information can be updated, but power consumption increases due to multiple blind detection processes
Solution Approach 1:
The base station performs preliminary action by notifying the UE of system information update timing in advance through wake-up signal transmission. The UE uses this advance notification to activate the main radio module only at the specific time when system information will be transmitted, avoiding continuous monitoring and multiple blind detection processes, thereby reducing power consumption while ensuring reliable system information updating
Solution Approach 2:
The patent extracts and separates the system information update notification function from the traditional paging message mechanism. By using a dedicated wake-up signal that specifically indicates system information update timing, the UE can directly activate to receive system information without undergoing the complete three-step process including paging message reception and SIB 1 reception, thus eliminating unnecessary blind detection processes and reducing power consumption
2Reliability
If the WUR module is in active state for system information updating, then the main radio module can be woken up, but cell synchronization is lost due to crystal frequency drift
Solution Approach 1:
The base station performs preliminary action by notifying the UE of system information update timing in advance through the wake-up signal. This advance notification allows the UE to activate the main radio module only at the precise moment when system information transmission occurs, minimizing the duration of main radio module activation and reducing the impact of crystal frequency drift on cell synchronization
Solution Approach 2:
The patent implements periodic action through the wake-up signal mechanism, where the base station periodically notifies the UE of system information update timing. This periodic notification structure allows the UE to maintain the WUR module in a low-power state most of the time, activating the main radio module only periodically when needed, thereby reducing the cumulative effect of frequency drift on synchronization
3Stability of the object's composition
If cell synchronization is performed before main radio module wake-up for system information updating, then synchronization is maintained, but power consumption and latency increase
Solution Approach 1:
The base station performs preliminary action by notifying the UE of system information update timing in advance through the wake-up signal. This advance notification allows the UE to perform cell synchronization only when necessary, right before activating the main radio module for system information reception, rather than performing synchronization continuously or before each wake-up event, thereby reducing power consumption while maintaining synchronization stability
Solution Approach 2:
The patent applies self-service by allowing the UE to autonomously determine when to perform cell synchronization based on the wake-up signal reception. The UE uses the advance notification in the wake-up signal to intelligently activate the main radio module only when system information update is indicated, performing synchronization on-demand rather than following a fixed schedule, thus optimizing the balance between synchronization stability and power consumption
Data Source
AI summary
A system information updating method, a user equipment and a base station are provided, the method including: receiving, by the wake-up radio (WUR) interface of the user equipment, a wake-up signal sent by the base station, where the wake-up signal is used to wake up a main radio interface of the user equipment and instruct the main radio interface of the user equipment to receive updated system information, the wake-up signal includes system information (SI) update transmission control information, and the SI update transmission control information includes information required for receiving the updated system information; waking up, by the WUR interface of the user equipment, the main radio interface of the user equipment; and receiving, by the user equipment according to the SI update transmission control information through the woken-up main radio interface, the updated system information sent by the base station.