SSB and Additional RS for Fine Time-Frequency Estimation in NR
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Solution Overview
Problem
Current 5G New Radio (NR) technologies face challenges in fine time-frequency estimation due to limitations in synchronization signal block (SSB) subcarrier spacing (SCS) variability, which affects communication efficiency and timing search complexity, especially in higher frequency bands.
Innovation Solution
The implementation of a method that generates and transmits a synchronization signal block (SSB) and an additional resource signal (RS) based on a variable function of SSB subcarrier spacing (SCS) for communication after initial acquisition, allowing for improved timing recovery and reduced complexity in higher frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SSB subcarrier spacing is fixed, then device complexity is reduced, but measurement precision deteriorates due to inability to perform fine time-frequency estimation in higher frequency bands
Solution Approach 1:
The patent segments the time-frequency estimation process into two distinct stages: initial acquisition using a first SSB with first subcarrier spacing, and fine estimation using a second SSB with second subcarrier spacing. This segmentation allows each stage to use optimized parameters for its specific purpose, resolving the contradiction between precision and complexity.
Solution Approach 2:
The patent introduces dynamic adaptability by allowing the network to configure different subcarrier spacings for different SSBs based on frequency band and service requirements. The UE adapts its estimation process accordingly, using appropriate spacing for each stage, thus achieving high precision without fixed complexity.
2Productivity
If SSB subcarrier spacing is increased for higher frequency bands, then communication efficiency is improved, but timing search complexity increases
Solution Approach 1:
The patent divides the communication establishment process into initial acquisition phase and fine estimation phase, each using appropriately scaled subcarrier spacings. This allows efficient high-spacing operation for fine estimation while using lower-spacing for initial acquisition, maintaining productivity without excessive complexity.
Solution Approach 2:
The patent performs preliminary coarse timing acquisition using the first SSB with appropriate initial subcarrier spacing before proceeding to fine estimation. This preliminary action establishes a foundation that reduces the search space for subsequent fine estimation, enabling efficient high-frequency operation without full complexity.
3Adaptability or versatility
If variable subcarrier spacing is implemented for different SSBs, then adaptability is improved for different frequency bands, but device complexity increases
Solution Approach 1:
The patent implements dynamic subcarrier spacing configuration where the network can independently set first and second subcarrier spacings for different SSBs based on frequency band and service type. The UE dynamically adapts its processing accordingly, achieving high frequency band adaptability with controlled complexity through standardized adaptation procedures.
Data Source
AI summary
In an aspect, the present disclosure includes a method, apparatus, and computer readable medium for wireless communications for generating, by a network entity for a user equipment (UE), a synchronization signal block (SSB) and an additional resource signal (RS) based on a variable function of a SSB subcarrier spacing (SCS) for communication after initial acquisition; and transmitting, by the network entity to the UE, the SSB including the additional RS.