PUCCH Power Control for Carrier Aggregation
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Solution Overview
Problem
Current power control methods for the Physical Uplink Control Channel (PUCCH) in LTE Release-10 do not provide accurate power control, particularly for PUCCH format 3 and channel selection, leading to potential inter-cell interference and reduced system throughput.
Innovation Solution
Implementing a linear function for the power control parameter h(nCQI,nHARQ) and providing exemplary values for ΔF_PUCCH(F) to enable more accurate power control of the PUCCH signal, allowing the UE to adjust its transmit power based on the configured PUCCH format and channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current power control methods for PUCCH in LTE Release-10 are used, then the system maintains backward compatibility with LTE Release-8, but power control accuracy deteriorates leading to inter-cell interference and reduced system throughput
Solution Approach 1:
The patent applies parameter changes by modifying the power control parameter h(nCQI,nHARQ) from its conventional formulation to a linear function of nHARQ. This parameter transformation enables accurate power control for PUCCH format 3 and channel selection while maintaining compatibility with existing LTE Release-8 infrastructure, thereby resolving the contradiction between backward compatibility and power control accuracy.
2Productivity
If current power control methods are used, then device complexity remains low, but power control accuracy deteriorates leading to reduced system throughput
Solution Approach 1:
By changing the mathematical formulation of h(nCQI,nHARQ) to a linear function, the patent achieves both improved power control accuracy and enhanced system throughput. The linear function provides a straightforward calculation method that maintains low device complexity while delivering accurate power control results, thus resolving the contradiction between throughput and measurement precision.
3Use of energy by moving object
If the power control parameter h(nCQI,nHARQ) is not accurately determined, then device complexity remains low, but energy per information bit consistency deteriorates
Solution Approach 1:
The patent transforms the power control parameter h(nCQI,nHARQ) into a linear function of nHARQ, which ensures consistent energy per information bit transmission. This parameter change provides a simple yet effective method to achieve accurate power control without increasing device complexity, resolving the contradiction between energy consistency and measurement precision.
Data Source
AI summary
A system and method for determining a Physical Uplink Control Channel (PUCCH) power control parameter h(nCQI,nHARQ) for two Carrier Aggregated (CA) PUCCH formats—PUCCH format 3 and channel selection. The value of h(nCQI,nHARQ) may be based on only a linear function of nHARQ for both of the CA PUCCH formats. Based on the CA PUCCH format configured for the User Equipment (UE), the e-Node B (eNB) may instruct the UE to select or apply a specific linear function of nHARQ as a value for the power control parameter h(nCQI,nHARQ), so as to enable the UE to more accurately establish transmit power of its PUCCH signal. Values for another PUCCH power control parameter—ΔF_PUCCH(F)—are also provided for use with PUCCH format 3. A new offset parameter may be signaled for each PUCCH format that has transmit diversity configured.