Dynamic Energy Detection Thresholds for Uplink Channel Access
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Solution Overview
Problem
Current wireless communication systems face challenges in improving uplink channel access probability on unlicensed spectra, particularly for ultra-reliable low latency communications (URLLC) services, where channel access failures lead to dropped transmissions and difficulties in meeting short latency and ultra-reliability requirements.
Innovation Solution
The method involves determining and adjusting energy detection thresholds for channel access procedures based on traffic types and transmit power settings, allowing user equipment (UE) to adapt energy detection thresholds dynamically for successful channel access, and employing RRC signaling to configure appropriate power control parameters and energy detection thresholds for different service types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed energy detection threshold is used for channel access procedure, then the channel access procedure is simple to implement, but the channel access probability is low and transmission reliability is poor for URLLC services
Solution Approach 1:
The patent applies dynamics by making the energy detection threshold adjustable rather than fixed. The base station configures different energy detection thresholds based on traffic types (eMBB or URLLC), allowing the system to adapt to different service requirements. For URLLC services, a higher energy detection threshold is configured to improve channel access probability and transmission reliability, while eMBB services use a lower threshold. This dynamic adjustment resolves the contradiction between simple implementation and high reliability.
Solution Approach 2:
The patent changes the energy detection threshold parameter based on traffic type. The base station configures a first energy detection threshold for eMBB services and a second energy detection threshold for URLLC services, where the second threshold is higher than the first. This parameter change allows the system to optimize channel access probability for URLLC while maintaining efficient access for eMBB, resolving the contradiction between simple fixed-threshold implementation and reliable variable-threshold operation.
2Reliability
If a higher energy detection threshold is used to improve channel access probability, then transmission reliability improves, but coexistence with other wireless systems deteriorates
Solution Approach 1:
The patent applies local quality by configuring different energy detection thresholds for different service types rather than using a uniformly high threshold for all services. URLLC services receive a higher threshold to ensure reliable access, while eMBB services use a lower threshold to maintain good coexistence with other wireless systems. This localized differentiation resolves the contradiction between improving channel access probability and maintaining fair coexistence.
Solution Approach 2:
The patent changes the energy detection threshold parameter based on traffic type requirements. By configuring a higher threshold specifically for URLLC services and a lower threshold for eMBB services, the system optimizes channel access probability where needed while minimizing interference to other wireless systems in normal operations. This selective parameter change resolves the contradiction between reliability improvement and coexistence degradation.
3Reliability
If multiple energy detection thresholds are configured for different traffic types, then channel access probability for URLLC improves, but the complexity of threshold configuration increases
Solution Approach 1:
The patent introduces the base station as an intermediary that centrally manages and configures multiple energy detection thresholds. The base station determines the traffic type (eMBB or URLLC) and configures the appropriate threshold (first or second) for each service. This intermediary approach simplifies the overall system complexity by centralizing the decision-making process, even though multiple thresholds are configured. The UE simply follows the base station's configuration without needing to independently manage multiple thresholds.
Solution Approach 2:
The patent changes the energy detection threshold parameter based on traffic type, with the base station configuring a first threshold for eMBB and a second (higher) threshold for URLLC. This parameter change approach allows multiple thresholds to be managed systematically through traffic type identification, reducing configuration complexity compared to managing multiple thresholds without a clear classification mechanism. The traffic type serves as the basis for selecting the appropriate threshold parameter.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses. According to some embodiments of the disclosure, a method for wireless communications performed by a UE may include: determining a first energy detection threshold for performing a channel access procedure; and performing the channel access procedure based on the first energy detection threshold.