Beamformed Reference Signal Access Under eCCA in 60 GHz Bands
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing channel access and beam training in unlicensed frequency bands above 52.6 GHz, particularly due to regulatory requirements and interference scenarios, which complicate the transmission of reference signals and synchronization signals.
Innovation Solution
Implementing an extended clear channel assessment (eCCA) mechanism that allows for short control signaling and reference signal transmissions without listen before talk (LBT) under certain conditions, ensuring compliance with regulatory thresholds and reducing interference by allowing transmissions up to 10% of the time within an observation period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If listen before talk (LBT) is implemented in unlicensed frequency bands above 52.6 GHz, then interference is reduced and regulatory compliance is improved, but channel access efficiency deteriorates and transmission reliability worsens due to additional assessment time and potential channel unavailability
Solution Approach 1:
The patent segments the clear channel assessment into two distinct parts: initial CCA (iCCA) performed before channel occupancy time (COT) acquisition, and extended CCA (eCCA) performed during COT. This segmentation allows different assessment strategies to be applied at different stages, improving overall channel access efficiency while maintaining interference reduction benefits.
Solution Approach 2:
The patent implements preliminary clear channel assessment (iCCA) before acquiring channel occupancy time, allowing the system to prepare and configure transmission parameters in advance. This preliminary action reduces the total time required for channel access by having assessments ready before actual data transmission begins.
2Productivity
If extended clear channel assessment (eCCA) is implemented, then channel access efficiency is improved and transmission opportunities increase, but measurement precision deteriorates due to longer assessment periods exposing the system to changing channel conditions
Solution Approach 1:
The patent implements dynamic CCA mechanisms where the assessment process can be adjusted based on real-time channel conditions. The system can adapt the duration and intensity of eCCA based on observed channel stability, allowing efficient channel access while maintaining measurement precision by intensifying assessments when conditions change.
Solution Approach 2:
The patent incorporates feedback mechanisms where the results of ongoing eCCA are continuously monitored and used to adjust subsequent assessment parameters. This feedback loop allows the system to maintain high channel access efficiency while preserving measurement precision by adapting the assessment strategy based on observed channel behavior patterns.
3Measurement precision
If reference signal transmissions are performed frequently for beam training, then beam alignment accuracy is improved, but interference increases and regulatory compliance becomes more difficult to maintain
Solution Approach 1:
The patent implements periodic reference signal transmissions within the structured COT framework, where beam training occurs at regular intervals during allocated transmission opportunities. This periodic action maintains beam alignment accuracy while concentrating interference into specific time windows, making it easier to comply with regulatory requirements during other periods.
Solution Approach 2:
The patent ensures continuous beam training capability by maintaining beam alignment information throughout the COT and performing periodic updates. This continuity allows the system to maintain accurate beam alignment without requiring constant transmission, thereby reducing overall interference while preserving measurement precision.
4Productivity
If channel occupancy time (COT) is extended to improve transmission efficiency, then productivity increases, but the system becomes more vulnerable to channel conditions changing during the extended period
Solution Approach 1:
The patent segments the extended COT into multiple sub-intervals with intermediate CCA checkpoints. This segmentation allows the system to maintain long transmission efficiency while periodically verifying channel conditions, thus preserving reliability by detecting and responding to channel changes without abandoning the extended COT structure.
Solution Approach 2:
The patent performs preliminary channel assessments and configurations at the beginning of COT, preparing transmission parameters in advance. This preliminary action allows the system to exploit favorable channel conditions for extended periods while having pre-configured mechanisms to quickly adapt if conditions change, thereby maintaining both productivity and reliability.
Data Source
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AI summary
Techniques of beamforming in reference signal (RS) transmissions, applicable to frequency ranges including frequencies between 52.6 GHz and 71 GHz, are described. Such techniques may include determining a communication channel is unoccupied for an initial duration, determining a number of communication slots of the communication channel to defer for transmission, and counting one or more communication slots of the communication channel that are not in use. The techniques may include determining the number of counted one or more communication slots is not equal to the determined number of communication slots of the communication channel to defer, and transmitting one or more data units based on the determination that the number of the counted one or more communication slots is not equal to the determined number of communication slots of the communication channel to defer.