Overbooked Uplink Channel Access Thresholds
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Solution Overview
Problem
In wireless communication systems, especially in 5G networks, the uncertainty in uplink channel access due to hidden interferers in unlicensed bands leads to inefficiencies in resource utilization and capacity, as existing methods struggle to effectively manage channel access for multiple User Equipments (UEs) sharing the same resource.
Innovation Solution
The implementation of an overbooked uplink (OUL) transmission method, where the same radio resource is allocated to multiple UE groups, enabling UEs to perform channel access using a multilevel threshold value in a contention slot, thereby minimizing uncertainty and optimizing channel access opportunities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same uplink resource is allocated to multiple UEs in an unlicensed band, then resource utilization efficiency and system capacity are improved, but channel access uncertainty increases due to hidden interferers
Solution Approach 1:
The patent changes the parameter of channel access threshold from a single fixed value to multiple dynamic threshold levels. The base station configures different threshold values (first threshold and second threshold) based on channel conditions, allowing UEs to adapt their channel access behavior dynamically. This resolves the contradiction by enabling efficient resource utilization while maintaining channel access certainty through adaptive threshold adjustment.
Solution Approach 2:
The patent introduces dynamic channel access mechanisms where UEs can switch between different access modes (first channel access using first threshold, second channel access using second threshold) based on channel conditions. The base station dynamically adjusts threshold values and notifies UEs of changes, transforming the static channel access process into a dynamic adaptive system that balances resource efficiency and access reliability.
2Productivity
If multiple UEs perform channel access simultaneously on the same resource, then system capacity increases, but collision probability increases leading to access failures
Solution Approach 1:
The patent applies different channel access thresholds to different UEs or different channel conditions locally. Instead of using a uniform threshold for all UEs, the base station configures specific threshold values tailored to individual UEs' channel access needs and conditions. This local differentiation reduces collision probability while maintaining high system capacity by allowing aggressive access where appropriate and conservative access where needed.
Solution Approach 2:
The patent implements a feedback mechanism where the base station monitors channel access outcomes and adjusts threshold values accordingly. When collisions occur or channel conditions change, the base station updates the threshold configuration and notifies UEs of changes. This feedback loop enables the system to learn from past collisions and optimize future access behavior, reducing collision probability while preserving system capacity.
Data Source
AI summary
The disclosure relates to a fifth-generation (5G) or a pre-5G communication system for supporting a higher data transfer rate than a fourth-generation (4G) communication system such as Long-Term Evolution (LTE). The disclosure relates to uplink transmission in a wireless communication system, in which an operating method of a user equipment (UE) may include: receiving information about a UE group to which the same uplink resource is allocated from a base station; receiving uplink resource allocation information corresponding to the UE group from the base station; performing channel access for uplink transmission on the basis of the received uplink resource allocation information; and transmitting uplink data to the base station after accessing a channel, wherein the channel access may be performed using a multilevel threshold value in a contention slot for the UE.