Half-Duplex Dual Connectivity Priority Conflict Resolution
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Solution Overview
Problem
In wireless communications systems, user equipment (UE) configured for half-duplex operations in dual connectivity (DC) face conflicts when simultaneously communicating with cells using different radio access technologies (RATs) and radio frequency (RF) spectrum bands, leading to interference between uplink and downlink transmissions.
Innovation Solution
The UE prioritizes communications based on slot format configurations and RF spectrum bands, determining that a first cell has priority over a second cell in cases of conflict, and adjusts its communication direction accordingly, potentially dropping communications on the second cell to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE communicates with multiple cells using different RATs and RF spectrum bands simultaneously, then the communication versatility and data rate are improved, but interference between uplink and downlink transmissions occurs due to half-duplex limitations
Solution Approach 1:
The patent implements dynamic prioritization of communication directions by determining conflicts between uplink and downlink transmissions in real-time. The UE dynamically adjusts which cell's communication direction takes priority based on ongoing transmission states, allowing the system to adaptively resolve interference issues while maintaining multi-cell connectivity across different RATs and frequency bands.
Solution Approach 2:
The patent changes the operational parameter from full-duplex to half-duplex mode when conflicts are detected between simultaneous uplink and downlink transmissions. By monitoring transmission directions across multiple cells and dynamically switching between communication modes, the system resolves interference while preserving the ability to communicate with multiple cells using different RATs and frequency bands.
2Reliability
If the UE prioritizes communication on one cell over another during conflicts, then transmission reliability is improved, but communication delays increase due to dropped transmissions on lower-priority cells
Solution Approach 1:
The patent employs feedback mechanisms where the UE continuously monitors transmission directions and conflict states across multiple cells. Based on this feedback, the system dynamically determines which cell should have priority in each time interval, allowing reliable transmission on the prioritized cell while minimizing delays through intelligent conflict resolution rather than simple transmission dropping.
Solution Approach 2:
The patent performs preliminary determination of communication priorities before conflicts actually occur by establishing rules for resolving half-duplex limitations. The UE proactively identifies potential conflicts between uplink and downlink transmissions and applies prioritization logic in advance, ensuring reliable transmission on high-priority cells while minimizing the impact of transmission drops on lower-priority cells.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a first slot format configuration for a first cell associated with a first radio access technology (RAT) and a first radio frequency spectrum band that conflicts with a second slot format configuration for a second cell associated with a second RAT and a second radio frequency spectrum band during at least a portion of a transmission time interval (TTI). The UE may determine that the first cell has a priority over the second cell, based on the configured slot formats or based on the radio frequency bands, and may drop a communication on the second cell based on the identified priority. The UE may then communicate during at least a portion of the TTI on the first cell while the UE drops a communication on the second cell.