MIMO Power Offset for Uplink Consistency
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Solution Overview
Problem
In Long Term Evolution Advanced (LTE-A) wireless communication systems, uplink power control faces challenges in managing transmit power effectively across multiple-input multiple-output (MIMO) transmission modes, especially with carrier aggregation, simultaneous PUSCH and PUCCH transmission, and multiple antennas, which affects Quality of Service (QoS) and inter-cell interference.
Innovation Solution
The method involves setting transmit power levels for the physical uplink shared channel (PUSCH) based on MIMO transmission modes, using a MIMO transmission mode power offset factor to account for different antenna gains, and dynamic rank adaptation to maintain target signal-to-noise ratio (SNR) across various MIMO modes, including spatial multiplexing, transmit diversity, and beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power is increased to maintain QoS across different MIMO modes, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmit power level based on the MIMO transmission mode. Different power offsets are applied for different MIMO modes (e.g., spatial multiplexing, transmit diversity, beamforming) to ensure consistent received power at the base station while adapting to the specific characteristics of each mode, thereby maintaining QoS without excessive energy consumption
Solution Approach 2:
The patent implements dynamics by making the transmit power adaptive rather than fixed. The wireless device dynamically selects and applies appropriate power offsets based on the currently active MIMO transmission mode, allowing the system to respond to changing transmission conditions and optimize the trade-off between reliability and energy consumption in real-time
2Reliability
If transmit power is increased to compensate for lower antenna gains in certain MIMO modes, then received power consistency is improved, but inter-cell interference increases
Solution Approach 1:
The patent uses parameter changes by introducing mode-specific power offsets that precisely compensate for the antenna gain differences between MIMO modes. Instead of uniformly increasing power, the system applies targeted adjustments only when needed for specific modes, thereby maintaining received power consistency while minimizing unnecessary power increases that would cause inter-cell interference
Solution Approach 2:
The patent applies local quality by making the power control strategy mode-specific rather than uniform. Each MIMO transmission mode receives a tailored power offset adjustment based on its specific antenna gain characteristics, allowing precise compensation for power consistency while avoiding excessive power transmission that would generate harmful interference in other scenarios
3Device complexity
If fixed transmit power is used across all MIMO modes, then device complexity is reduced, but received power consistency deteriorates
Solution Approach 1:
The patent resolves this contradiction by implementing parameter changes through a standardized power control mechanism that adjusts transmit power based on MIMO mode. The approach maintains relatively simple device complexity by using predefined power offsets for different modes while achieving received power consistency through the dynamic application of these parameters, avoiding the need for complex real-time calculations
Data Source
AI summary
A wireless device and a method of operating the wireless device is disclosed for controlling a transmission power of a wireless transmit receive unit (WTRU). A total transmission power employed by the WTRU when transmitting via a single antenna may be offset by a total transmission power offset value from a total transmission power employed by the WTRU when transmitting via a plurality of antennas.