Wake-Up Preamble Synchronization for Low-Power NR Reception
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Solution Overview
Problem
The low power wake up receiver (LP-WUR) in Release 18 has lower receive sensitivity than New Radio (NR) devices, leading to significant time/frequency deviations and affecting the reception of low power wake up signals and data transmission performance.
Innovation Solution
The method involves receiving a target preamble signal to obtain synchronization information and resource location information, using multiple preamble signals with different synchronization accuracies to ensure accurate reception and transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LP-WUR is used to reduce power consumption, then power consumption is reduced, but receive sensitivity deteriorates leading to time/frequency deviations
Solution Approach 1:
The wake-up signal reception process is segmented into two distinct phases: initial wake-up detection using LP-WUR with low power consumption, and subsequent data transmission using NR device with full functionality. This segmentation allows the system to operate in low-power mode during idle periods while maintaining high performance when service is needed.
Solution Approach 2:
The LP-WUR performs preliminary wake-up detection before the main NR device is activated. By detecting the wake-up signal in advance using the low-power receiver, the system can prepare for upcoming data transmission while minimizing the time the power-intensive NR device needs to remain active.
2Device complexity
If LP-WUR without PLL components is used, then device complexity is reduced, but synchronization accuracy deteriorates
Solution Approach 1:
A simplified timing advance mechanism acts as an intermediary between the low-precision LP-WUR and the high-precision NR data transmission. The terminal reports its wake-up reception timing to the network, which then calculates and applies the appropriate timing advance value, achieving accurate synchronization without requiring complex PLL components in the LP-WUR.
Solution Approach 2:
The patent replaces the mechanical/physical synchronization mechanism (PLL circuits) with a software-based timing calculation and compensation mechanism. Instead of using hardware loops to achieve frequency and time synchronization, the system uses timing measurements and network-side calculations to achieve the same goal with simpler hardware.
3Device complexity
If single preamble signal is used, then device complexity is reduced, but synchronization accuracy and resource location determination deteriorate
Solution Approach 1:
The wake-up signal structure is segmented into a wake-up preamble and an associated data channel. The wake-up preamble contains timing information for wake-up detection, while the data channel carries additional synchronization and resource location information. This segmentation allows the LP-WUR to perform initial detection with minimal complexity while enabling accurate synchronization through the data channel.
Solution Approach 2:
The patent adds an additional dimension to the wake-up signal by introducing an associated data channel that carries supplementary information. Instead of relying solely on the wake-up preamble for all synchronization information, the system distributes information across two dimensions: the wake-up preamble for initial detection and the data channel for precise synchronization and resource location determination.
Data Source
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AI summary
This disclosure provides an information transmission method and apparatus, terminal and network device. The method is performed by a terminal and includes: receiving a target preamble signal, wherein the target preamble signal is used by the terminal to receive a first signal; and obtaining target synchronization information and/or resource location information of the first signal according to the target preamble signal.