Wake-Up Signal Transmission Using Timing Information
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Solution Overview
Problem
The challenge in 5G networks is the inefficient transmission of wake-up signals (WUS) for base stations, leading to unclear energy-saving mechanisms and potential power wastage, particularly in scenarios where UE cannot receive system information and timing information from non-anchor cells.
Innovation Solution
Implementing a method for transmitting wake-up signals based on timing information, using a transceiver to communicate with anchor and non-anchor cells, and employing a wake-up radio (WUR) to detect and wake up sleeping cells with Zadoff-Chu sequences, along with pre-defined configurations for random access procedures and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If base stations use sleep mode to save energy, then energy consumption is reduced, but the ability to receive system information and timing information is lost
Solution Approach 1:
The patent divides base stations into anchor cells and non-anchor cells. Anchor cells remain active and continue to transmit system information and timing information, while non-anchor cells can enter sleep mode. This segmentation allows the network to maintain necessary information transmission capabilities while enabling energy-saving mode for specific cells.
Solution Approach 2:
The patent introduces a wake-up signal as an intermediary mechanism. When a non-anchor cell needs to wake up from sleep mode, it receives a wake-up signal from an anchor cell or UE, which contains timing information. This intermediary signal enables the sleeping cell to resume operations without continuously monitoring for system information.
2Speed
If base stations continuously monitor for wake-up signals, then response time is reduced, but energy consumption increases
Solution Approach 1:
The patent implements periodic monitoring where base stations in sleep mode check for wake-up signals at specific intervals rather than continuously. The WUS monitoring occurs at predetermined times, allowing the base station to balance between quick response capability and energy conservation by remaining in low-power state during non-monitoring periods.
3Device complexity
If wake-up signal transmission is implemented without timing information, then simplicity is improved, but synchronization accuracy deteriorates
Solution Approach 1:
The patent incorporates timing information directly into the wake-up signal transmission parameters. The timing information is used to pre-determine when and how the wake-up signal is transmitted, ensuring that the receiving base station can synchronize its operations accurately. This preliminary configuration of timing parameters maintains synchronization accuracy without requiring complex post-reception processing.
Data Source
AI summary
Various solutions for wake-up signal (WUS) transmission based on timing information with respect to user equipment and network apparatus in mobile communications are described. An apparatus may receive a system information and a timing information for waking up a non-anchor cell from an anchor cell. The apparatus may transmit a WUS based on the system information and the timing information to wake up the non-anchor cell. The anchor cell comprises a cell where the apparatus is capable of receiving the system information and the timing information and performing a timing and frequency synchronization. The non-anchor cell comprises a cell where the apparatus cannot receive the system information and the timing information.