Multi-Carrier Beam LBT Procedure Above 52.6 GHz
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Solution Overview
Problem
The increasing complexity of wireless communications, particularly above the 52.6 GHz band, poses challenges for multi-carrier and multi-beam listen before talk (LBT) procedures due to the need for efficient spectrum management and compliance with regulatory requirements.
Innovation Solution
The implementation of type 1 LBT in each carrier and independent per-beam LBT for multi-carrier and multi-beam operations, respectively, allows for the maintenance and update of separate back-off counters for each carrier or beam, ensuring aligned transmission starting times and preventing overlapping transmissions and LBT processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-carrier and multi-beam LBT procedures are implemented above 52.6 GHz, then spectrum management efficiency and regulatory compliance are improved, but system complexity and difficulty of implementation increase
Solution Approach 1:
The patent segments the LBT procedure into separate independent processes for each carrier and each beam. Type 1 LBT is performed independently on each carrier, and independent per-beam LBT is performed for each beam direction. This segmentation allows the system to manage complex multi-carrier multi-beam operations by breaking down the overall LBT process into manageable atomic units, where each carrier-beam combination can be accessed independently without interfering with others.
Solution Approach 2:
The patent introduces a new dimension to traditional LBT by implementing independent per-beam LBT procedures. Instead of performing LBT only in the frequency domain (across carriers), the system adds a spatial dimension by performing separate LBT for each beam direction. This dimensional extension allows the system to manage spectrum access in three-dimensional space (frequency × spatial direction), thereby handling the complexity of multi-carrier multi-beam systems more effectively.
2Measurement precision
If separate back-off counters are maintained for each carrier and beam, then channel access accuracy is improved, but processing overhead and operational complexity increase
Solution Approach 1:
The patent maintains separate back-off counters for each carrier and each beam, segmenting the channel access control mechanism into independent units. Each carrier has its own back-off counter, and each beam has its own back-off counter, allowing precise control and accurate measurement of channel access conditions for each specific carrier-beam combination. This segmentation enables the system to track and manage channel access state with high precision.
Solution Approach 2:
Each carrier and beam performs its own LBT procedure independently using its dedicated back-off counter, without requiring centralized coordination or intervention. The system enables self-service operation where each carrier-beam pair autonomously manages its channel access, updating its own back-off counter based on local channel conditions, thereby reducing overall operational complexity despite the presence of multiple counters.
3Productivity
If LBT procedures are performed for each carrier and beam independently, then channel access efficiency is improved, but risk of overlapping transmissions and self-blocking increases
Solution Approach 1:
The patent performs LBT procedures as a preliminary action before actual transmission begins. By requiring each carrier and beam to complete its Type 1 LBT procedure and update its back-off counter to zero before transmitting, the system ensures that channel access is secured in advance. This preliminary channel access confirmation prevents overlapping transmissions by ensuring that no transmission starts until the LBT procedure has successfully completed and the channel is confirmed clear.
Solution Approach 2:
The system implements feedback mechanisms where the result of each LBT procedure on each carrier and beam is fed back to control the transmission timing. The back-off counter values and channel access outcomes are continuously monitored and used to adjust transmission schedules, preventing self-blocking by ensuring that transmissions only occur when LBT has confirmed channel availability. This feedback loop maintains channel access efficiency while preventing harmful overlapping transmissions.
Data Source
AI summary
An apparatus and system of providing a listen before talk (LBT) procedure in multi-carrier or multi-beam mode above a 52.6 GHz band are described. The LBT procedure is performed independently for each carrier or beam to maintain and update a different back-off counter for each carrier or beam. To align a transmission starting time across the carriers or beams, for each carrier or beam: the counter continues to decrement if the counter has reached zero before the starting time and transmit at the starting time if the channel continues to be sensed idle for an additional observation period immediately prior to the starting time and otherwise considers the LBT procedure to have failed. The counter is reinitialized for carriers or beams for which a channel occupancy time (COT) is to be acquired and transmission ceases.