Uplink Carrier Aggregation Power Allocation Under MTPL Constraints
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing uplink power when multiple carriers are concurrently transmitted by a user equipment (UE) due to maximum transmission power limits, leading to potential throughput degradation and inability to transmit on all carriers simultaneously.
Innovation Solution
The UE applies adjustments to the maximum transmission power limit (MTPL) parameter for each carrier, allowing power distribution across multiple carriers, including dynamic adjustments based on scheduling parameters and discontinuous transmission states, to ensure compliance with combined MTPL while maintaining transmission on all carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the UE transmits at maximum power on one carrier, then the transmit power for that carrier is maximized, but the total transmit power limit is exceeded and other carriers cannot transmit
Solution Approach 1:
The patent segments the maximum transmission power limit (MTPL) into multiple component power limits, one for each carrier. This allows the UE to distribute the total power across multiple carriers simultaneously, ensuring that each carrier receives an appropriate power allocation while the sum of all carrier powers does not exceed the overall MTPL. This resolves the contradiction by enabling multiple carriers to transmit reliably without exceeding the total power constraint.
Solution Approach 2:
The patent implements dynamic adjustment of component power limits based on scheduling parameters, channel conditions, and transmission priorities. The network can dynamically reconfigure the power distribution among carriers, allowing the system to adapt to changing conditions and optimize power allocation in real-time, thereby maintaining transmission reliability across all carriers while respecting the total power limit.
2Productivity
If the UE transmits on multiple carriers simultaneously, then the system throughput is improved, but the transmit power per carrier must be reduced due to MTPL constraints
Solution Approach 1:
By dividing the total MTPL into multiple component power limits corresponding to each carrier, the system enables simultaneous transmission on multiple carriers. Each carrier is assigned a specific power budget that contributes to the overall throughput, allowing the system to achieve higher aggregate data rates through multi-carrier operation while maintaining power compliance.
Solution Approach 2:
The patent changes the power allocation parameters dynamically based on scheduling information, channel quality indicators, and transmission priorities. By adjusting the component power limits as parameters, the system can optimize the trade-off between the number of active carriers and the power per carrier, thereby maximizing system throughput under the MTPL constraint.
3Reliability
If the UE applies a static power reduction to comply with MTPL, then the total power limit is respected, but the power distribution cannot adapt to changing transmission conditions
Solution Approach 1:
The patent establishes a dynamic power allocation mechanism where component power limits are adjusted based on scheduling parameters, channel conditions, and transmission priorities. This dynamic approach allows the system to maintain power compliance with the MTPL while adapting to changing transmission conditions, resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The system implements feedback mechanisms where the network monitors transmission conditions and adjusts component power limits accordingly. Based on channel quality reports, scheduling decisions, and power consumption patterns, the network can reconfigure the power distribution among carriers, ensuring both compliance with the total power limit and adaptability to varying transmission requirements.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described for uplink transmit power determination in which a user equipment (UE) may be configured for carrier aggregation of multiple concurrent uplink component carrier (CC) transmissions. The UE may apply an adjustment to a maximum transmit power limit (MTPL) for one or more CCs when the UE is configured for uplink carrier aggregation. The MTPL adjustment may be applied to reduce a transmit power of one of the CCs when a maximum transmit power is requested for the CC. The MTPL adjustment may reduce the transmit power to be less than the MTPL of the UE and thereby provide that one or more other CCs may still have some transmission power. The UE may compute a MTPL adjustment based on a static value or on a per-subframe basis based on scheduling parameters and a requested transmit power for each CC.