Shared-Spectrum UE Transmission Prioritization Under LBT Constraints
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Solution Overview
Problem
In shared spectrum systems, there is a need to determine prioritization of transmissions by user equipment (UE) to ensure fair coexistence among different communication systems, particularly in unlicensed bands, where regulations like listen before talk (LBT) and maximum channel occupancy time (MCOT) apply, and issues arise from configured and dynamic grant transmissions.
Innovation Solution
A method and apparatus for UE to adjust and prioritize transmissions by configuring first and second sets of symbols in the time domain, adjusting the first transmission based on priority and channel access procedures, and ensuring sufficient time for channel access before the second transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE performs multiple RB set-based LBT procedures for uplink transmission, then the probability of successful channel access increases, but the time required for channel access and transmission preparation increases
Solution Approach 1:
The network configures multiple RB sets in advance for the UE, allowing the UE to perform LBT procedures on multiple resource blocks simultaneously or in parallel. This preliminary configuration enables the UE to have multiple ready-to-use resource blocks, reducing the time needed for channel access while maintaining high success probability through diversified LBT attempts across multiple RB sets
2Adaptability or versatility
If a UE prioritizes dynamic transmission over configured grant transmission, then transmission flexibility and responsiveness improve, but transmission continuity and resource utilization may deteriorate
Solution Approach 1:
The patent introduces a dynamic priority adjustment mechanism where the UE can switch between configured grant and dynamic transmission based on real-time channel conditions, traffic requirements, and LBT outcomes. The system dynamically adjusts which transmission type takes precedence, allowing the UE to maintain transmission continuity through configured grants when channel conditions are poor, while switching to dynamic transmissions when flexibility is needed and channel conditions permit
Solution Approach 2:
The network pre-configures grant resources in advance, providing the UE with guaranteed transmission opportunities that can be activated immediately without waiting for dynamic scheduling. This preliminary configuration ensures transmission continuity is maintained even when dynamic scheduling responses are delayed or when channel conditions require immediate transmission
Data Source
AI summary
An apparatus and a method of transmission of the same are provided. A method of transmission of a user equipment (UE) includes being configured by a base station to transmit a first transmission on a first set of symbols in time domain, transmitting a second transmission on a second set of symbols in the time domain, and adjusting the first transmission. This can determine prioritization transmissions and can further determine prioritization in a shared spectrum system.