Multicarrier Uplink Power Allocation for Imbalance
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Solution Overview
Problem
Current wireless communication systems, particularly in HSUPA, face issues with power imbalance between uplink carriers, leading to degraded data transmission efficiency and reliability, as existing techniques fail to maximize data transmission due to significant power differences between carriers affected by interference.
Innovation Solution
Implementing a method to dynamically adjust transmit power across multiple uplink carriers based on data size and effective power per bit, and prioritizing high-priority data transmission over the more reliable carrier to optimize data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power is proportionally allocated to multiple uplink carriers based on data grant size, then total data transmission capacity is maximized, but transmission reliability deteriorates due to significant power imbalance between carriers with different interference levels
Solution Approach 1:
The patent applies local quality by differentiating power allocation strategies for different carriers based on their individual channel conditions. Instead of uniform proportional allocation, the system identifies carriers with good versus poor channel quality and applies different power allocation rules: carriers with good channel quality receive power allocation based on data grant proportion, while carriers with poor channel quality receive enhanced power allocation to ensure minimum transmission reliability. This localized differentiation resolves the contradiction by optimizing for capacity where conditions permit and for reliability where conditions are adverse.
Solution Approach 2:
The patent changes the power allocation parameter dynamically based on channel quality measurements. The system monitors channel conditions and adjusts the power allocation ratio between carriers, transitioning from static proportional allocation to dynamic allocation that adapts to varying interference levels. This parameter change enables the system to maintain optimal data transmission capacity while ensuring minimum reliability thresholds are met on all carriers.
2Reliability
If more power is allocated to a carrier with strong interference to maintain transmission reliability, then transmission reliability improves, but data transmission capacity on other carriers deteriorates due to power shortage
Solution Approach 1:
The patent segments the power allocation decision-making process into separate evaluations for each carrier. Instead of treating the multi-carrier system as a unified resource pool, the system independently assesses channel quality for each carrier and makes segmented power allocation decisions. This segmentation allows the system to identify which carriers require reliability-focused power allocation and which can maintain capacity-focused allocation, thereby preventing power shortage on high-capacity carriers while ensuring reliability on problematic carriers.
Solution Approach 2:
The patent applies local quality by implementing carrier-specific power allocation strategies based on individual channel conditions. Each carrier receives power allocation tailored to its specific interference environment rather than uniform allocation. Carriers experiencing strong interference receive localized power boosts to maintain reliability, while carriers with favorable conditions maintain their capacity-optimized allocation, thus resolving the zero-sum trade-off between reliability and capacity.
3Ease of operation
If high priority data is transmitted first on the secondary carrier as per current specifications, then data transmission follows standard procedure, but transmission reliability deteriorates when the secondary carrier experiences strong interference
Solution Approach 1:
The patent introduces dynamics into the data transmission sequence by making the transmission order adaptive rather than static. The system dynamically determines which carrier transmits high-priority data first based on real-time channel quality assessments. When the secondary carrier experiences strong interference, the system dynamically switches the transmission priority to the primary carrier, thereby maintaining standard operational simplicity while adapting to actual channel conditions to ensure reliability.
Solution Approach 2:
The patent changes the transmission priority parameter based on channel quality conditions. Instead of fixed priority assignment according to carrier designation, the system adjusts the priority parameter dynamically, assigning high-priority transmission to the carrier with better channel conditions. This parameter change enables the system to maintain ease of operation through automated decision-making while improving reliability by avoiding transmission on interfered carriers for critical data.
Data Source
AI summary
In aspects for controlling transmit power of dual carrier uplink transmission for wireless communications, a user equipment (UE) determines presence of transmit power imbalance between a first and second radio frequency (RF) carrier of respective dedicated physical control channels for uplink transmission. The UE determines an estimate of a remaining available transmit power after estimating the transmit power used by each of the dedicated physical control channels. The UE allocates the estimated remaining available transmit power to the first and second RF carrier respectively based on both a size of data granted for uplink transmission on each RF carrier and on an effective power per bit on each RF carrier. Additionally, the UE determines a higher reliability value for each RF carrier based on a lower data error rate, identifies priority values for data to be transmitted and sends higher priority data over the RF carrier with higher reliability value.