Directional Channel Access Logic for 60 GHz Spectrum Efficiency
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Solution Overview
Problem
Current directional channel access methods in 60 GHz links, such as quasi-omni CCA, degrade spectrum utilization efficiency by incorrectly identifying channel availability, leading to unnecessary backoffs and reduced simultaneous transmissions.
Innovation Solution
Implementing directional channel access logic circuitry that performs directional clear channel assessments (CCAs) and quasi-omni CCAs to independently manage channel access on multiple carrier frequencies, allowing for concurrent and non-interfering transmissions by determining channel availability in specific sectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quasi-omni CCA is used for channel access, then channel availability can be detected in all directions, but spectrum utilization efficiency deteriorates due to incorrect identification of channel availability
Solution Approach 1:
The patent segments the channel access process by implementing separate directional CCA procedures for different spatial sectors. Each sector performs independent clear channel assessment, allowing the system to identify which specific sectors are available for transmission. This segmentation resolves the contradiction by enabling accurate channel availability detection per sector rather than treating all directions uniformly, thus improving spectrum utilization while maintaining reliability.
2Productivity
If directional CCA is performed for each sector, then simultaneous transmissions in non-interfering sectors are enabled, but device complexity increases due to multiple independent CCA management
Solution Approach 1:
The patent merges the management of multiple directional CCAs under a unified channel access mechanism. The access point coordinates simultaneous transmissions across multiple sectors by consolidating CCA results and managing transmission opportunities centrally. This merging approach enables simultaneous transmissions in non-interfering sectors while reducing device complexity through centralized coordination rather than independent management at each transmitter.
3Reliability
If backoff procedures are implemented to avoid interference, then transmission reliability is improved, but data throughput deteriorates due to unnecessary waiting periods
Solution Approach 1:
The patent performs preliminary directional clear channel assessments in each sector before transmission attempts. By proactively identifying available sectors through directional CCA, the system can immediately initiate transmissions in non-interfering sectors without requiring backoff waiting periods. This preliminary action resolves the contradiction by maintaining transmission reliability through interference avoidance while preserving data throughput through immediate transmission opportunities.
Data Source
AI summary
Logic to place one or more protocol data units (PDUs) in a transmit queue for transmission. Logic to perform a directional clear channel assessment (CCA) for a first sector of a 60 gigahertz (GHz) link, the directional CCA to determine only if the first sector is busy or idle. Logic to determine the directional CCA indicates idle for the first sector. Logic to cause transmission of the first PDU to the STA via the first sector of the 60 GHz link based on the directional CCA. Logic to receive an acknowledgement (ACK) of receipt of the PDU from the STA. Logic to perform a directional CCA for a second sector of the 60 GHz link. And logic to communicate via the first sector and the second sector independently.