Radio Base Station Channel Access for High-Frequency Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-frequency bands like 52.6 GHz to 71 GHz, existing radio base stations face inefficiencies in transmitting synchronization signal blocks due to the limited directional coverage of Directional LBT/CCA, which restricts the number of signal blocks that can be transmitted within a channel occupancy time.
Innovation Solution
A radio base station with a control unit that performs channel access using a wider directivity or multiple directional receive beams, allowing for the transmission of multiple synchronization signal blocks within a single channel occupancy time, enhancing transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Directional LBT/CCA is used to perform channel access in high-frequency unlicensed bands, then the channel access can be performed with directional coverage, but the number of synchronization signal blocks that can be transmitted within a channel occupancy time is limited
Solution Approach 1:
The patent segments the channel access procedure into multiple types (Type 1, Type 2A, Type 2B, Type 2C) with different LBT parameter configurations. Each type represents a different segmentation of the channel access strategy, allowing the system to select appropriate segments for different transmission scenarios, thereby improving both reliability and transmission efficiency
Solution Approach 2:
The patent introduces dynamic selection of LBT types and parameters based on channel conditions, transmission requirements, and beam directions. The gNB can dynamically switch between different LBT types and adjust parameters like contention window size and defer period, making the channel access procedure adaptive and efficient across varying operational conditions
2Device complexity
If a single directional LBT/CCA covers only a particular direction, then the channel access is simplified for that direction, but the transmission coverage and number of signal blocks within COT are restricted
Solution Approach 1:
The patent makes the channel access procedure universal by defining a set of LBT types that can be applied across different beam directions and transmission scenarios. Type 1 provides omnidirectional coverage, while Type 2 variants provide directional coverage, and the system can universally apply the appropriate type based on requirements, thereby expanding effective coverage without proportionally increasing complexity
Solution Approach 2:
The patent creates a composite channel access mechanism by combining multiple LBT types with different characteristics. Each LBT type acts as a different 'material' with specific properties (omnidirectional vs. directional, different parameter sets), and the system composes the optimal access strategy by selecting and combining appropriate types, achieving both simplified procedures and expanded coverage
Data Source
AI summary
A channel access procedure is executed in a second frequency band different from the first frequency band. A radio base station executes a channel access procedure using a single directional reception beam, and transmits a single synchronization signal block in a channel occupancy time after the channel access procedure.