Uplink MIMO Power Control via Reference Channel Feedback
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Solution Overview
Problem
Current multiple antenna technologies in wireless communication systems lack effective mechanisms for power reference and dynamic feedback in uplink transmission, leading to suboptimal performance in achieving desired signal-to-interference ratios and transmission quality.
Innovation Solution
The method involves dynamically controlling transmit power by transmitting reference channels through multiple antennas, using feedback to adjust power levels and configure transmission parameters, and measuring the quality of secondary streams to determine gain factors for data channels, enabling precise power management and improved signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antenna technologies are implemented in uplink transmission, then transmission robustness and data throughput are improved, but power control mechanism is lacking leading to suboptimal signal-to-interference ratios
Solution Approach 1:
The patent implements a feedback mechanism where the receiver measures the signal-to-interference ratio of reference channels and sends power control commands back to the transmitter. This closed-loop feedback enables dynamic adjustment of transmit power to achieve target signal-to-interference ratios, resolving the lack of power control mechanism in multiple antenna uplink transmission.
Solution Approach 2:
The patent dynamically changes the transmit power parameter based on measured channel conditions and feedback commands. By adjusting power levels of different antenna streams according to their respective channel qualities, the system optimizes signal-to-interference ratios while maintaining transmission robustness.
2Measurement precision
If reference channels are transmitted on multiple streams with different precoding weights, then transmission quality measurement accuracy is improved, but system complexity increases
Solution Approach 1:
The patent segments the reference channel transmission across multiple independent streams, each with its own precoding weights. This allows separate measurement and optimization of each stream's transmission quality, improving overall measurement accuracy while managing complexity through modular stream-based processing.
Solution Approach 2:
The reference channels serve multiple functions: they enable channel estimation, transmission quality measurement, and power control feedback for multiple streams simultaneously. This multi-functionality improves measurement accuracy without proportionally increasing system complexity.
3Productivity
If dynamic power control is implemented for uplink MIMO, then transmission efficiency is improved, but power reference mechanism is lacking
Solution Approach 1:
The patent transmits reference channels before data channels, establishing a power reference level in advance. This preliminary action provides the necessary power reference information for subsequent dynamic power control of data transmissions, enabling efficient power management without information loss.
Solution Approach 2:
The reference channel acts as an intermediary that carries power reference information from the transmitter to the receiver and back. This intermediary mechanism enables the power control loop to function by providing the necessary reference information that would otherwise be lost in the absence of a dedicated power reference mechanism.
Data Source
AI summary
A method for dynamically controlling the transmit power of transmission streams transmitted via multiple antennas is disclosed. A transmit power level for multiple streams is determined based on a first reference channel. The difference of signal to interface ratios (SIRs) between two reference channels may represent a power offset. The power offset may be used to determine gain factors used to transmit data channels on the secondary stream with reference to the gain factor of the first reference channel. The power offset may be used to determine other parameters, such a serving grant or transport block sizes of channels carried on the secondary stream. The power offset may allow transmission parameters of channels on the secondary stream to be determined based on the transmit power level of the primary stream and a gain factor for a reference channel transmitted via the primary stream.