Power Allocation Matrix for Data Streams in LTE Systems
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face inefficiencies in power allocation across multiple data streams and frequency bands, leading to suboptimal throughput due to uniform power distribution despite varying SINR levels.
Innovation Solution
Implementing a method where power is allocated to each data stream based on individual Channel Quality Indicators (CQI) reports, using a power allocation matrix that differentiates power distribution across streams and sub-bands, allowing for optimized coding and modulation schemes without additional signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uniform power allocation is used across all data streams, then device complexity is reduced and ease of operation is improved, but throughput and channel capacity are suboptimal
Solution Approach 1:
The patent applies local quality by allocating different power levels to different data streams based on their individual channel conditions (CQI). Each stream receives power according to its specific quality requirements, with stronger channels receiving less power and weaker channels receiving more power, thereby optimizing overall throughput while maintaining manageable complexity through standardized procedures
Solution Approach 2:
The patent changes the power allocation parameter from a uniform fixed value to a dynamic value that varies per data stream based on CQI measurements. This parameter change enables the system to adapt to varying channel conditions and maximize throughput by adjusting power distribution according to actual channel quality
2Productivity
If water filling power allocation is implemented, then channel capacity increases by 20-50%, but signaling overhead and system complexity increase
Solution Approach 1:
The patent applies self-service by utilizing CQI reports that are already generated and signaled by the user equipment for other purposes (channel quality feedback). The base station uses these existing CQI values directly for power allocation without requiring additional signaling, thereby achieving water-filling-like optimization without the associated signaling overhead
Solution Approach 2:
The patent makes the CQI reporting mechanism serve multiple functions: both channel quality feedback for link adaptation and power allocation input. This multi-functionality eliminates the need for separate signaling channels for power allocation information, reducing overall signaling overhead while maintaining optimal power distribution
3Productivity
If different power levels are allocated to different data streams, then throughput is optimized, but loss of energy increases due to unequal power distribution
Solution Approach 1:
The patent changes the power allocation parameter dynamically based on channel conditions, allocating higher power to streams with poorer channel quality and lower power to streams with better quality. This adaptive parameter adjustment ensures that power is not wasted on already strong channels while providing sufficient power to weaker channels, optimizing the balance between throughput and power efficiency
Data Source
AI summary
In a method of allocating power to data streams in a communication system, providing (S10) CQI for each of a plurality of data streams between a radio base station node and a user equipment node in the system. Subsequently, allocating (S20) transmit power to each of the plurality of data streams based at least on the provided respective CQI, and determining coding and modulation (S30) for the data streams based on at least the allocated power.