Beam-Based Channel Access for Unlicensed Wireless 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 different access procedures based on whether the sensing beam is included in the sensing beams, allowing for efficient channel occupancy and transmission using time division multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel access procedure is performed for each transmission beam separately, then channel access control is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent combines multiple channel access procedures into a single procedure that applies to multiple transmission beams simultaneously. The base station performs channel access once for the first transmission beam, then reuses this access result for subsequent transmission beams within the same channel occupancy period, eliminating redundant access procedures and improving transmission efficiency.
Solution Approach 2:
The patent performs channel access procedure in advance for the first transmission beam before actual data transmission begins. This preliminary channel access establishes the channel occupancy period and access rights that are then applied to multiple transmission beams, allowing efficient use of unlicensed spectrum without requiring separate access procedures for each beam.
2Measurement precision
If sensing beam is not included in sensing beams, then channel sensing accuracy is improved, but channel access complexity increases
Solution Approach 1:
The patent applies different channel access procedures based on the local characteristics of each transmission beam. For transmission beams where the sensing beam is included in the sensing beams set, a simplified access procedure is used. For transmission beams where the sensing beam is not included, a different access procedure is applied. This localized differentiation optimizes both sensing accuracy and access complexity management.
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.