Dynamic Channel Access Switching in Unlicensed Spectrum
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Solution Overview
Problem
In wireless communication systems using unlicensed spectra, User Equipment (UE) faces challenges in determining the appropriate channel access manner for uplink transmissions within Channel Occupancy Time (COT) to ensure fair coexistence with other communication systems, as existing methods lack clear indication and flexibility in switching between different channel access types.
Innovation Solution
The method involves UE receiving indication information from the network device to determine the channel access manner for UL bursts or sidelink bursts within COT, allowing switching between Cat-1, 16µs Cat-2, and 25µs Cat-2 LBT types based on the provided information, ensuring compliance with regulatory requirements and optimizing channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE uses fixed channel access manner for UL transmission in COT, then implementation is simple, but adaptability to different channel conditions is poor
Solution Approach 1:
The patent applies dynamics by enabling the UE to dynamically switch between different channel access manners (Cat-1 LBT, 16µs Cat-2 LBT, 25µs Cat-2 LBT) based on network device indications. The channel access manner is no longer fixed but adapts to different transmission scenarios within the COT, allowing the system to respond to changing channel conditions while maintaining clear determination rules through network control.
2Reliability
If UE performs channel detection before every UL transmission, then channel access reliability is improved, but transmission delay increases
Solution Approach 1:
The patent segments the channel access approach by dividing the COT into different transmission occasions with distinct channel access requirements. For example, the first UL transmission may require 25µs Cat-2 LBT for reliable channel assessment, while subsequent transmissions within the same COT may use Cat-1 LBT (no channel detection) or 16µs Cat-2 LBT, reducing delay while maintaining reliability where needed.
Solution Approach 2:
The network device performs preliminary action by providing advance indications to the UE about the required channel access manner for upcoming UL transmissions. This allows the UE to prepare appropriately without performing unnecessary channel detection, reducing delay while ensuring reliability through network-coordinated channel access strategies.
3Adaptability or versatility
If multiple channel access manners are supported, then flexibility in channel access is improved, but determination complexity increases
Solution Approach 1:
The network device acts as an intermediary that simplifies the determination process for the UE. Instead of the UE independently deciding among multiple channel access manners, the network device provides clear indications (e.g., via DCI or MAC CE) specifying which manner to use. This maintains flexibility in supporting multiple access types while easing the operation burden on the UE through centralized control.
Data Source
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AI summary
Disclosed is an information transmission method, comprising: a terminal apparatus receiving first indication information sent by a network apparatus, the first indication information being used to determine at least one channel access approach within a channel occupation duration of the network apparatus; and the terminal apparatus determining, according to the first indication information, a first channel access approach for a target transmission opportunity within the channel occupation duration, wherein the target transmission opportunity is used to transmit a target signal or a target channel. Also disclosed are another information transmission method, an electronic apparatus, and a storage medium.