UE Uplink Priority Switching Across RF Chains
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Solution Overview
Problem
In wireless communication systems, UEs face challenges in efficiently handling uplink transmissions with multiple subscriptions when higher priority transmissions are granted during ongoing lower priority transmissions, leading to delays and inefficiencies due to shared RF resources.
Innovation Solution
A UE cancels the remaining portion of a lower priority uplink transmission upon receiving a grant for a higher priority transmission and switches to a separate RF chain to perform the higher priority transmission, utilizing mechanisms like switched uplink or SRS carrier switching to ensure timely completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a UE uses shared RF resources for multiple subscriptions, then device complexity is reduced, but transmission priority handling becomes inefficient causing delays
Solution Approach 1:
The patent segments the RF resources into dedicated RF chains for different subscriptions. Each subscription has its own dedicated RF chain, preventing resource sharing conflicts and enabling independent priority-based transmission control for each subscription, thus resolving the contradiction between reduced complexity and transmission efficiency
2Productivity
If a UE maintains ongoing lower priority transmissions, then resource utilization is maximized, but higher priority transmissions experience delays
Solution Approach 1:
The patent implements dynamic transmission management where the UE can cancel ongoing lower priority transmissions when higher priority transmissions are detected. The system dynamically adjusts transmission status based on priority levels, allowing the UE to switch from resource utilization maximization to time-critical transmission assurance when needed
3Reliability
If a UE cancels ongoing lower priority transmissions for higher priority transmissions, then transmission priority is respected, but resource utilization decreases
Solution Approach 1:
The patent implements a feedback mechanism where the UE monitors transmission priorities and dynamically adjusts resource allocation. When higher priority transmissions are detected, the system receives feedback about priority changes and accordingly cancels lower priority transmissions, balancing reliability requirements with resource utilization efficiency
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may perform, to a first base station and via a first radio frequency (RF) chain, at least a portion of a first uplink transmission associated with a first priority. The UE may receive, from the first base station or from a second base station and during the first uplink transmission, a physical downlink control channel (PDCCH) grant for a second uplink transmission associated with a second priority higher than the first priority. The UE may cancel a remaining portion of the first uplink transmission based at least in part on receiving the PDCCH grant for the second uplink transmission. The UE may perform, to the first base station or to the second base station and via a second RF chain, the second uplink transmission. Numerous other aspects are described.