Uplink Power Control for Multi-Carrier Wireless Transmissions
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing uplink power control across multiple component carriers with different timing advances, leading to potential interference and battery life issues due to inadequate adaptation to radio propagation characteristics.
Innovation Solution
A wireless transmit/receive unit (WTRU) determines and adjusts transmit powers for physical channels across multiple timing advance groups to ensure that the sum of powers in overlapping portions does not exceed a configured maximum output power, and performs power scaling or adjustments in each subframe to prevent exceeding the maximum output power, including dropping sounding reference signals and sending power headroom reports to the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power is increased to achieve desired quality-of-service, then data rate and error rate performance is improved, but interference to other users increases and battery life decreases
Solution Approach 1:
The patent implements dynamic transmit power control by adjusting power parameters based on real-time radio propagation conditions. The system monitors path loss, shadowing, and interference levels, then adapts transmit power parameters accordingly to maintain quality-of-service while minimizing interference generation.
Solution Approach 2:
The patent employs feedback mechanisms where the system continuously monitors transmission quality, interference levels, and channel conditions. Based on this feedback, the power control algorithm adjusts transmit power parameters dynamically to optimize the balance between achieving desired quality-of-service and minimizing interference to other users.
2Reliability
If transmit power is increased to achieve desired quality-of-service, then data rate and error rate performance is improved, but battery life decreases
Solution Approach 1:
The patent dynamically adjusts transmit power parameters based on actual channel conditions and quality-of-service requirements. By adapting power parameters in real-time rather than using fixed high power settings, the system achieves desired performance while minimizing unnecessary energy consumption and extending battery life.
Solution Approach 2:
The patent applies power control that uses only the necessary amount of power required to achieve the desired quality-of-service level. Instead of consistently using maximum or excessive power, the system applies partial power adjustments matched to actual transmission needs, thereby reducing energy consumption while maintaining performance.
3Productivity
If power control adapts to radio propagation characteristics, then transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent divides the power control system into manageable components including separate monitoring modules for path loss and shadowing, distinct calculation modules for different power parameters, and organized feedback processing. This segmentation allows the complex adaptation to radio propagation characteristics to be implemented through modular, maintainable code while improving transmission efficiency.
Data Source
AI summary
A method and apparatus for power control for wireless transmissions are disclosed. A wireless transmit/receive unit (WTRU) may reduce transmission power to channels for carrier aggregation such that a total transmit power of the WTRU is smaller than or equal to a maximum transmission power level in all symbols of a transmission. Further, transmission power may be allocated to the channels for carrier aggregation based on priority. Also, transmission power may be allocated to a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) with uplink control information over a PUSCH without uplink control information. Moreover, transmission power may be allocated to a PUCCH or a PUSCH over a sounding reference signal (SRS) transmission. Additionally, the WTRU may transmit data over one or more channels, of the channels for carrier aggregation, at the respective transmission power allocated to the one or more channels.