SSB Configuration for NR Access in Narrow Low-Band Spectrum
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Solution Overview
Problem
Existing wireless communication systems face challenges in deploying networks using narrow bandwidths that are less than the minimum required for synchronization signal blocks (SSBs), such as in the 900 MHz band, which prevents proper configuration and transmission of SSBs, limiting the deployment of NR in low-band spectrum.
Innovation Solution
The solution involves configuring SSBs to occupy less than the minimum bandwidth by puncturing edges and transmitting only within the available bandwidth, allowing for the transmission of essential synchronization signals like PSS, SSS, and PBCH, even in bands narrower than the minimum SSB bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SSB configuration follows minimum bandwidth requirements, then synchronization signal transmission is reliable, but deployment in narrow bandwidth bands (e.g., 900 MHz) is prevented
Solution Approach 1:
The patent changes the bandwidth parameter of SSB configuration to accommodate narrow bandwidth bands. By allowing SSB bandwidth to be configurable below the traditional minimum threshold, the system enables deployment in bands like 900 MHz while maintaining essential synchronization functionality through adjusted resource element allocation and mapping patterns.
Solution Approach 2:
The patent segments the SSB configuration into flexible resource element allocations that can be adapted to available bandwidth. By dividing the synchronization signal transmission into configurable resource blocks and symbols, the system can scale to fit narrow bandwidth constraints while preserving the core synchronization function.
2Adaptability or versatility
If SSB bandwidth is reduced to fit narrow bands, then spectrum availability expands, but configuration complexity increases
Solution Approach 1:
The patent introduces dynamic configuration parameters for SSB bandwidth, resource blocks, and symbol allocation. These parameters can be adjusted based on the available spectrum width, allowing the system to adapt to different band constraints without requiring fundamentally different configuration structures. The dynamic nature enables seamless transition between bandwidth scenarios.
Solution Approach 2:
The patent creates a universal SSB configuration framework that can operate across multiple bandwidth scenarios using the same basic structure. By designing configurable resource element mappings and allocation patterns that work across wide and narrow bands, the system achieves multi-functionality without increasing fundamental complexity.
3Reliability
If SSB occupies full minimum bandwidth, then signal quality is maintained, but available spectrum in narrow bands is insufficient
Solution Approach 1:
The patent adjusts the bandwidth parameter of SSB configuration to accommodate narrow bandwidth bands. By allowing SSB bandwidth to be configurable below the traditional minimum threshold, the system enables deployment in bands like 900 MHz while maintaining essential synchronization functionality through adjusted resource element allocation and mapping patterns.
Solution Approach 2:
The patent applies partial action by allocating only the necessary portion of resource elements for SSB transmission within the constrained bandwidth. Instead of requiring the full minimum bandwidth, the system uses a scaled-down configuration that provides sufficient signal quality for synchronization while fitting within the available spectrum quantity.
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, a synchronization signal block (SSB) associated with an SSB configuration for an operating band having a maximum bandwidth that is narrower than a minimum SSB bandwidth for an access link. The UE may decode the SSB based at least in part on the SSB configuration. Numerous other aspects are described.