Uplink Grant Handling Under MPE Limits in Millimeter Wave UE
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing uplink transmissions when user equipment (UE) is power limited due to exposure thresholds, particularly in frequency ranges like millimeter wave (FR2), leading to potential transmission power limitations and inefficiencies.
Innovation Solution
The UE employs techniques to manage uplink transmissions by adjusting power levels, dropping transmissions, steering data between frequency ranges, and using padding or control information to comply with exposure limits, such as maximum permissible exposure (MPE) thresholds, ensuring transmissions do not exceed these limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE transmits uplink signals in millimeter wave frequency range, then communication capacity and speed are improved, but transmission power is limited due to exposure thresholds
Solution Approach 1:
The patent implements dynamic power management by adjusting transmission power levels based on real-time exposure threshold conditions. The UE monitors exposure limits and dynamically scales back transmission power in millimeter wave frequency ranges when thresholds are approached, while maintaining higher power transmission in sub-6 GHz ranges, thereby resolving the contradiction between achieving high transmission speed and adhering to power limitations.
Solution Approach 2:
The patent changes operational parameters by switching between different frequency ranges (sub-6 GHz and millimeter wave) based on exposure threshold conditions. When exposure limits are exceeded in millimeter wave range, the system transitions to sub-6 GHz frequency range for transmission, altering the frequency parameter to maintain communication effectiveness while complying with power constraints.
2Reliability
If the UE uses multiple frequency ranges for dual-connectivity, then communication reliability is improved, but power management complexity increases
Solution Approach 1:
The patent segments the power management function by implementing separate power control mechanisms for different frequency ranges. The UE independently manages power for sub-6 GHz and millimeter wave connections, with dedicated exposure threshold monitoring and power adjustment for each frequency range, reducing the complexity of managing multiple frequency ranges while maintaining communication reliability.
Solution Approach 2:
The patent introduces an intermediary power management layer that coordinates transmissions across multiple frequency ranges. This intermediary mechanism monitors exposure thresholds and dynamically allocates power between sub-6 GHz and millimeter wave connections, simplifying the overall power management complexity while ensuring reliable communication through dual-connectivity.
3Productivity
If the UE increases transmission power to meet data demands, then data transmission efficiency is improved, but exposure thresholds are exceeded
Solution Approach 1:
The patent implements periodic monitoring of exposure thresholds during transmission. The UE continuously checks exposure limits at regular intervals and adjusts transmission power accordingly, enabling efficient data transmission when thresholds are available while preventing harmful exposure violations, thus resolving the contradiction between productivity and safety.
Solution Approach 2:
The patent employs feedback mechanisms where the UE monitors exposure threshold conditions and uses this information to dynamically adjust transmission power. When exposure thresholds are approached or exceeded, the system receives feedback and reduces power in millimeter wave transmissions or redirects traffic to sub-6 GHz ranges, maintaining data transmission efficiency while preventing harmful exposure levels.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described for handling uplink grants that have associated uplink transmission that may exceed exposure limits. Exposure limits may be based on maximum permissible exposure (MPE) limits of millimeter wave transmissions and may be determined at a user equipment (UE) and provided to a base station. If the UE receives an uplink grant for a transmission in which an associated uplink transmission would exceed the exposure limits, the UE may drop the uplink transmission prior to forming a transport block, transmit control signaling to the base station to indicate the exposure limits at the UE, or combinations thereof.