Beam-Based Channel Access for Reliable Unlicensed Signal Transmission
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Solution Overview
Problem
The challenge of efficiently transmitting signals in wireless communication systems, particularly in unlicensed frequency bands, is exacerbated by interference with existing devices and the need for robust coexistence mechanisms to ensure communication quality.
Innovation Solution
A wireless device and method that employs channel access procedures involving sensing beams and transmission beams, with differentiated channel access procedures based on whether the sensing beam is included in the sensing beams, allowing for efficient multiplexing and non-overlapping transmissions within channel occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel access procedure is performed for each transmission beam independently, then transmission reliability is improved, but channel access time increases
Solution Approach 1:
The patent combines multiple independent channel access procedures into a single shared sensing beam channel access procedure. Instead of performing LBT separately for each transmission beam, the system performs one channel access using the sensing beam and then multiplexes multiple transmission beams within the obtained channel occupancy time, thereby reducing total access time while maintaining reliability through the sensing beam's comprehensive channel assessment.
Solution Approach 2:
The sensing beam performs preliminary channel sensing before actual data transmission begins. By completing the channel access procedure in advance using the sensing beam, the system establishes channel occupancy time that can then be utilized by multiple transmission beams without requiring each beam to independently perform the time-consuming LBT procedure.
2Productivity
If sensing beam covers multiple transmission beams, then channel access efficiency is improved, but beam management complexity increases
Solution Approach 1:
The patent segments the channel occupancy time into distinct periods for different transmission beams after the initial sensing beam access. This allows the system to manage multiple beams systematically by dividing the transmission timeline, reducing the complexity of coordinating multiple simultaneous beam accesses while maintaining the efficiency benefits of shared channel access.
3Speed
If first channel access procedure is performed without channel sensing, then transmission speed increases, but interference with existing devices increases
Solution Approach 1:
The patent applies different channel access qualities to different beams: the sensing beam performs comprehensive channel sensing with LBT to assess interference conditions, while subsequent transmission beams utilize the obtained channel occupancy time without repeating the full sensing procedure. This local differentiation allows fast transmission while the sensing beam's preliminary interference assessment protects against harmful interference with existing devices.
Data Source
AI summary
The present invention relates to a wireless communication system and, more specifically, to a method and a wireless device therefor, the method comprising the steps of: successfully accessing channels in one or more sensing beams before a channel occupancy (CO) starts, each sensing beam covering one or more transmission beams in the CO; and, after transmission using a first transmission beam in the CO, performing a channel access procedure on a sensing beam corresponding to a second transmission beam in order to perform transmission using the second transmission beam in the CO.