NR-Light Wake Up Signal Transmission Optimization
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Solution Overview
Problem
The existing wake up signal transmission methods in NB-IoT are not adequately optimized for the more stringent requirements of NR-light systems, particularly in terms of time duration and frequency domain resource usage, leading to potential false alarms and inefficiencies in power consumption.
Innovation Solution
A method for generating and transmitting a wake up signal in NR-light systems, where the wake up signal is composed of base sequences mapped to frequency-time resources, with specific determination of M continuous PRBs and N continuous OFDM symbols, and repetition numbers configured to optimize transmission and reception, including information about slot and symbol indices for PDCCH monitoring occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If wake up signal is transmitted using NB-IoT methods in NR-light system, then power saving is achieved, but false alarms occur and efficiency is reduced due to mismatch with NR-light requirements
Solution Approach 1:
The patent applies parameter changes by adapting the wake-up signal transmission parameters to NR-light system requirements. Specifically, it configures the number of base sequences L, the bandwidth part bandwidth, subcarrier spacing, and the dimensions M (continuous PRBs) and N (continuous OFDM symbols) of the base resource unit according to NR-light specifications. This parameter adaptation resolves the contradiction by ensuring the wake-up signal is transmitted with appropriate power and duration for NR-light, preventing false alarms while maintaining power saving benefits.
2Device complexity
If wake up signal uses fixed resource allocation, then transmission is simple, but resource utilization is inefficient for varying bandwidth and sequence lengths
Solution Approach 1:
The patent implements dynamics by making the wake-up signal resource allocation adaptive rather than fixed. The base resource unit dimensions M and N are dynamically determined based on the bandwidth part bandwidth, subcarrier spacing, and sequence length. The patent calculates M based on the relationship between available frequency resources and the required sequence length, and determines N based on time domain requirements. This dynamic allocation optimizes resource utilization for different transmission scenarios while maintaining manageable complexity through standardized calculation formulas.
3Loss of information
If wake up signal monitoring is performed at every Paging Occasion, then no messages are missed, but power consumption increases unnecessarily during low activity periods
Solution Approach 1:
The patent applies preliminary action by introducing a wake-up signal that is transmitted before the actual paging occasion. The UE monitors for this preliminary wake-up signal indication, and only proceeds to monitor the full PDCCH at the paging occasion if the wake-up signal is detected. This preliminary filtering mechanism ensures that UEs do not miss actual paging messages while avoiding unnecessary power consumption during low activity periods, as the wake-up signal provides advance notice of upcoming paging transmissions.
Data Source
AI summary
Methods, a remote unit and a base unit are disclosed. According to one embodiment, a method at a base nit, comprising: generating a wake up signal which indicates that a remote unit shall attempt to receive a paging message in a paging occasion, wherein the wake up signal is generated by L base sequences, each of the L base sequences is mapped to a base resource unit, where L is an integer, wherein the base resource unit includes M continuous Physical Resource Blocks (PRBs) in frequency domain and N continuous Frequency Division Multiplexing (OFDM) symbols within a slot in time domain, where M and N are integers; mapping the wake up signal to a frequency-time resource; and transmitting, to the remote unit, the mapped wake up signal in the frequency-time resource.