Frequency-Band Channel Access with Adaptive DBTW Detection
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Solution Overview
Problem
UEs performing initial cell selection and access in high-frequency bands like 52.6 GHz to 71 GHz cannot determine whether a discovery burst time window (DBTW) is applied in the cell, leading to inefficiencies in channel access.
Innovation Solution
The UE determines the use of DBTW based on synchronization raster positions, PBCH read offsets, k_SSB offset values, CORESET #0 configuration indices, half-frame indications, common sub-carrier spacing, physical cell IDs, PSS/SSS sequences, and remaining minimum system information to adaptively configure the DBTW.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If UEs perform initial cell selection and access in high-frequency bands without DBTW configuration information, then channel access procedures are simplified, but channel access efficiency deteriorates due to inability to determine DBTW application
Solution Approach 1:
The UE autonomously determines whether DBTW is applied by detecting synchronization signal positions and comparing them against predefined synchronization raster values, eliminating the need for explicit network configuration signaling. This self-service mechanism resolves the contradiction by enabling efficient channel access through UE-side determination while maintaining procedural simplicity.
2Productivity
If explicit DBTW configuration signaling is provided to UEs, then channel access efficiency improves, but device complexity and signaling overhead increase
Solution Approach 1:
The network does not need to explicitly signal DBTW configuration to UEs. Instead, UEs self-determine DBTW application status by autonomously detecting synchronization signal positions and comparing them with predefined synchronization raster values, thereby achieving efficient channel access without increased signaling overhead or device complexity.
Solution Approach 2:
The invention changes the parameter used for DBTW determination from explicit configuration signaling to implicit synchronization signal position detection. By using the position of detected synchronization signals relative to predefined synchronization raster values as the determining parameter, the system achieves efficient channel access while avoiding additional signaling complexity.
3Ease of operation
If UEs use fixed synchronization raster positions for cell selection, then synchronization procedures are simplified, but adaptability to different DBTW configurations deteriorates
Solution Approach 1:
The invention introduces dynamics into the synchronization procedure by enabling UEs to adapt their cell selection behavior based on detected synchronization signal positions. While the synchronization raster positions remain fixed for simplicity, the UE dynamically determines DBTW application status by comparing detected positions against predefined raster values, thereby achieving both simplicity and adaptability.
Solution Approach 2:
The invention changes the operational parameter from fixed synchronization behavior to adaptive behavior based on detected signal positions. By using the detected synchronization signal position as a variable parameter that indicates DBTW application status, the system maintains simple fixed synchronization raster positions while achieving adaptability to different DBTW configurations through parameter interpretation.
Data Source
AI summary
Example embodiments of the present disclosure relate generally to communications and, more particularly, to channel access for a frequency band. An apparatus detects at least one synchronization signal and physical broadcast channel block during searching for a synchronization signal associated with a cell in a communication network. The apparatus determines a configuration related to whether or not a discovery burst transmission window is used for the cell. The apparatus determines, based on the configuration, whether or not the discovery burst transmission window is used for the cell. The apparatus determines at least one assumption to use when monitoring and detecting the synchronization signal and physical broadcast channel block, based on whether or not the discovery burst transmission window is used for the cell.