Dynamic Synchronization Raster for Narrow Bandwidth Cell Search
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Solution Overview
Problem
Legacy synchronization raster designs are too sparse to enable successful detection of synchronization signal blocks (SSBs) in channels with narrow transmission bandwidths, such as those less than or equal to 5 MHz, leading to incomplete SSB transmission and connection establishment issues between network nodes and user equipment (UEs).
Innovation Solution
A synchronization raster based on transmission bandwidth is implemented, where the UE performs a cell search and detects SSBs within a channel having a bandwidth of less than or equal to 5 MHz, ensuring the SSB is fully transmitted within the channel, and the network node outputs SSBs accordingly to establish a connection with the UE. This involves adjusting the step size of the synchronization raster to match or exceed the channel raster step size, ensuring complete SSB detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy synchronization raster designs are used, then the system maintains compatibility with existing wide bandwidth channels, but the detection of synchronization signal blocks fails in narrow transmission bandwidth channels (≤5 MHz)
Solution Approach 1:
The synchronization raster step size is made dynamic rather than fixed. The network node determines the appropriate synchronization raster step size based on the actual transmission bandwidth of the channel. For narrow bandwidth channels (≤5 MHz), a smaller synchronization raster step size is used to ensure complete SSB transmission within the channel bandwidth, while wider bandwidth channels can use larger step sizes for efficiency.
Solution Approach 2:
The patent changes the parameter of synchronization raster step size to adapt to different transmission bandwidth conditions. By adjusting this parameter based on channel characteristics, the system achieves reliable SSB detection in narrow bandwidth channels while maintaining compatibility with wider bandwidth channels, thus resolving the contradiction between reliability and adaptability.
2Reliability
If the synchronization raster step size is reduced to enable complete SSB transmission in narrow bandwidth channels, then SSB detection reliability improves, but the cell search complexity and time increase
Solution Approach 1:
The system dynamically adjusts the synchronization raster step size based on the transmission bandwidth. In narrow bandwidth channels (≤5 MHz), a smaller step size is used to ensure complete SSB transmission. In wider bandwidth channels, a larger step size is used to reduce cell search time. This dynamic adaptation resolves the contradiction between transmission completeness and search efficiency.
Solution Approach 2:
Different synchronization raster configurations are applied locally to different bandwidth conditions. Instead of using a uniform step size across all channels, the system applies optimized step sizes specific to each bandwidth scenario, ensuring both complete SSB transmission in narrow bands and efficient cell search in wide bands.
3Device complexity
If a fixed synchronization raster design is used, then the system structure remains simple, but it cannot support reliable operation in channels with varying bandwidths
Solution Approach 1:
The synchronization raster design transitions from fixed to dynamic, where the step size is determined based on the transmission bandwidth. This allows the system to maintain simplicity in configuration while adapting to different bandwidth scenarios, supporting reliable operation across varying channel conditions without significantly increasing structural complexity.
Solution Approach 2:
The synchronization raster mechanism is designed to serve multiple bandwidth scenarios through a single adaptive framework. By making the step size dependent on transmission bandwidth, the same basic structure can universally support both narrow and wide bandwidth channels, eliminating the need for separate fixed designs for each scenario.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may perform, in accordance with a synchronization raster, a cell search in a channel having a transmission bandwidth that is less than or equal to 5 MHz, wherein the synchronization raster is based at least in part on the transmission bandwidth. The UE may detect, based at least in part on the cell search, a synchronization signal block (SSB). Numerous other aspects are described.