Wake-Up Signal Triggered SIB1 Transmission for 5G/6G Energy Saving
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Solution Overview
Problem
Existing wireless communication systems face significant energy consumption issues due to periodic transmission of signals and channels, such as System Information Block 1 (SIB1), which are not necessary all the time, leading to unnecessary energy waste.
Innovation Solution
Implementing an on-demand SIB1 operation in base stations (BS) where transmissions occur only when necessary, triggered by a wake-up signal (WUS) from terminals, and configuring this operation through higher-layer signaling or pre-configured methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic transmission of SIB1 is implemented to ensure system information availability, then terminals can reliably access system information, but base stations consume unnecessary energy during idle periods
Solution Approach 1:
The patent implements on-demand SIB1 transmission where the base station transitions from periodic transmission to event-triggered transmission. The base station activates SIB1 transmission only when a wake-up signal is detected from a terminal, and deactivates it when no terminals require the information, thereby eliminating unnecessary periodic transmissions during idle periods while maintaining reliability when needed
Solution Approach 2:
The system enables terminals to autonomously request SIB1 information by detecting and transmitting wake-up signals when they need system information updates. This self-service mechanism allows terminals to trigger base station transmissions only when necessary, rather than relying on continuous periodic broadcasting, thus reducing base station energy consumption while ensuring information availability on demand
2Loss of information
If continuous SIB1 transmission is performed to ensure terminals always have access to system information, then system information freshness is maintained, but unnecessary energy is wasted in the network
Solution Approach 1:
The patent implements a mechanism where terminals prepare to request SIB1 information by monitoring for wake-up signals before actually needing the information. When a terminal detects a wake-up signal indicating SIB1 transmission will occur, it prepares to receive the information, ensuring information freshness is maintained only when triggered by actual demand rather than continuous transmission
Solution Approach 2:
The system dynamically changes the transmission parameter of SIB1 from a fixed periodic schedule to a demand-driven activation state. The base station monitors for wake-up signals and changes its transmission behavior accordingly - remaining inactive when no terminals need information and activating transmission when wake-up signals are detected, thus maintaining information freshness only when necessary and reducing network energy consumption
3Ease of operation
If base stations transmit SIB1 periodically to all terminals, then all terminals receive system information uniformly, but energy consumption increases without proportional benefit
Solution Approach 1:
The patent transforms the static periodic transmission mechanism into a dynamic on-demand system. The base station continuously monitors for wake-up signals from terminals and dynamically adjusts its SIB1 transmission behavior - remaining inactive when no terminals require information and activating transmission only when wake-up signals indicate demand. This dynamic approach maintains ease of terminal access when needed while dramatically improving energy efficiency by eliminating transmissions during periods when no terminals require the information
Data Source
AI summary
The disclosure relates to a fifth generation (5G) or sixth generation (6G) communication system for supporting a higher data transmission rate. A method performed by a terminal in a wireless communication system includes receiving, from a first cell, a wake up signal (WUS) configuration, considering a second cell as a candidate cell for cell reselection based on the WUS configuration, transmitting, to the second cell, a WUS based on the WUS configuration for requesting a system information block 1 (SIB 1) and receiving, from the second cell, the SIB1.