UE Channel Access Mode Selection for Unlicensed Uplink Signals
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing signal transmission and reception, particularly in unlicensed bands, where efficient acquisition and utilization of channel access modes are not adequately addressed.
Innovation Solution
A method and apparatus for user equipment (UE) in a wireless communication system that includes receiving system information, acquiring a channel access mode, performing a channel access procedure based on the mode, and transmitting an uplink signal, with distinct first and second modes for channel access, including random backoff-based and periodic CAP types, enabling efficient signal transmission in unlicensed bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single channel access procedure is used for all uplink signals, then the system is simple to operate, but communication efficiency in unlicensed bands deteriorates
Solution Approach 1:
The patent segments the channel access procedure into two distinct modes: Type 1 CAP with random backoff for contention-based access, and Type 2 CAP without random backoff for deterministic access. This segmentation allows the system to select the appropriate access mode based on service requirements, thereby improving communication efficiency while maintaining operational simplicity through standardized procedures.
Solution Approach 2:
The patent introduces dynamic channel access mode selection where the UE can adaptively choose between Type 1 and Type 2 CAP based on system information, service type, and channel conditions. This dynamic adaptation enables the system to optimize communication efficiency for different scenarios while keeping the operational framework unified and manageable.
2Adaptability or versatility
If random backoff-based CAP is used for all signals, then channel access is flexible, but signal transmission delay increases
Solution Approach 1:
The patent divides channel access into two distinct procedures: Type 1 CAP implementing random backoff for flexible contention-based access, and Type 2 CAP eliminating random backoff for deterministic low-latency access. This segmentation allows real-time signals to use Type 2 for immediate transmission while other signals use Type 1 for flexible access, resolving the delay-f Flexibility trade-off.
Solution Approach 2:
The patent applies different channel access qualities to different signal types and service requirements. Type 2 CAP provides deterministic, low-latency access locally optimized for real-time services, while Type 1 CAP provides flexible, adaptive access for other services. This local quality differentiation enables each signal type to use the most appropriate access mechanism.
3Loss of time
If deterministic CAP is used for all signals, then signal transmission is timely, but channel access reliability deteriorates
Solution Approach 1:
The patent segments channel access into Type 1 CAP with random backoff that provides reliability through collision avoidance, and Type 2 CAP without random backoff that provides timeliness through deterministic access. By segmenting the access methods, the system can ensure reliable access for non-critical signals while achieving timely access for real-time signals.
Solution Approach 2:
The patent changes the backoff parameter dynamically: Type 1 CAP uses random backoff parameters for reliable contention resolution, while Type 2 CAP uses zero or fixed backoff parameters for deterministic timely access. This parameter differentiation allows the system to optimize both reliability and timeliness for different service requirements.
Data Source
AI summary
The present disclosure discloses a method of a user equipment (UE) in a wireless communication system. Especially, the method comprising: receiving system information; performing a channel access procedure (CAP) based on one of a first channel access mode and a second channel access mode different from the first channel access mode; and transmitting an uplink signal based on a result of the CAP, and wherein, based on the system information including information related to a channel access mode, the CAP is performed based on one of the first channel access mode and the second channel access mode based on the information, and wherein, based on the system information not including the information related to the channel access mode, the CAP is performed based on the first channel access mode.