Wake-Up Receiver Bandwidth Part Configuration for Power Reduction
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Solution Overview
Problem
There is a demand for a signal transmission scheme for user equipment (UE) with a wake-up receiver to address excessive power consumption and achieve high energy efficiency in wireless communication systems.
Innovation Solution
The proposed method involves a UE transmitting capability information to a base station (BS) indicating support for a wake-up receiver (WUR), receiving configuration information for a synchronization signal or wake-up signal, identifying a bandwidth part (BWP) indicated by the configuration information, and receiving the synchronization signal or wake-up signal on the identified BWP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main radio is continuously activated to receive signals, then the reliability of signal reception is improved, but the power consumption increases excessively
Solution Approach 1:
The radio frequency reception function is segmented into two independent parts: a low-power wake-up receiver that continuously monitors for wake-up signals, and a main radio that remains inactive until triggered. This segmentation allows the system to maintain signal reception capability while dramatically reducing power consumption during idle periods.
Solution Approach 2:
The wake-up receiver performs preliminary monitoring of the radio frequency environment before activating the main radio. By detecting wake-up signals in advance, the system prepares for upcoming communication tasks, ensuring the main radio is activated only when necessary, thus balancing reliability and power consumption.
2Speed
If the wake-up receiver continuously monitors for signals, then the responsiveness to wake-up signals is improved, but the energy consumption of the wake-up receiver increases
Solution Approach 1:
The wake-up receiver operates in periodic monitoring cycles rather than continuous operation. It activates at predetermined intervals to check for wake-up signals, then enters a low-power state between cycles. This periodic operation maintains system responsiveness while significantly reducing the average energy consumption of the wake-up receiver.
3Reliability
If the main radio is activated frequently to ensure data reception, then the data transmission reliability is improved, but the overall energy efficiency deteriorates
Solution Approach 1:
The wake-up receiver serves as an intermediary between the external environment and the main radio. It filters incoming signals and only triggers the main radio when actual wake-up signals are detected, preventing unnecessary activations. This intermediary function ensures data transmission reliability is maintained only when needed, improving overall energy efficiency.
Data Source
AI summary
A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes transmitting, to a base station, capability information indicating that a wake-up receiver (WUR) is supported at the UE, receiving configuration information regarding a synchronization signal for the WUR or a wake-up signal (WUS) via master information block (MIB) or system information block (SIB), based on the capability information, identifying a bandwidth part (BWP) indicated by the configuration information, and receiving the synchronization signal for the WUR or the WUS on the identified BWP.