Uplink Power Control for Carrier Aggregation in Wireless Devices
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing carrier aggregation and dual connectivity, particularly in handling high data traffic demands and spectrum limitations, which affect network capacity and user experience.
Innovation Solution
The implementation of carrier aggregation and dual connectivity techniques, including orthogonal frequency division multiplexing (OFDM) and licensed assisted access (LAA), enables the use of both licensed and unlicensed spectrum, optimizing network efficiency through dynamic modulation and coding schemes, and adaptive channel assessment to manage traffic and spectrum effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation and dual connectivity are implemented to increase network capacity, then network capacity and data rates are improved, but device complexity and power consumption increase
Solution Approach 1:
The patent segments the uplink transmission by dividing it into multiple parts: a first uplink transmission on a first carrier and a second uplink transmission on a second carrier. This segmentation allows the system to distribute traffic across multiple carriers, increasing overall network capacity while managing device complexity by handling each transmission separately with distinct power control mechanisms.
Solution Approach 2:
The patent extends the power control mechanism from a single-carrier dimension to a multi-carrier dimension by introducing separate power control adjustments for each carrier. This dimensional extension allows independent optimization of power allocation across carriers, enabling the system to achieve higher network capacity without proportionally increasing device complexity.
2Productivity
If carrier aggregation is used to manage high data traffic demands, then network capacity increases, but power consumption increases
Solution Approach 1:
The patent implements dynamic power control adjustments where the transmit power for each uplink transmission is independently adjusted based on power control commands received for each respective carrier. This dynamic approach allows the system to optimize power consumption in real-time, allocating more power to carriers with better channel conditions and less power to carriers with poorer conditions, thereby maintaining high network capacity while reducing overall power consumption.
Solution Approach 2:
The patent changes the power control parameters by introducing separate power control adjustment mechanisms for each carrier. By applying different power control commands to different carriers based on their individual channel conditions, the system can achieve high network capacity while minimizing total power consumption through parameter optimization.
3Productivity
If multiple carriers are aggregated to increase network capacity, then data rates improve, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent segments the power control measurement process by associating separate power control commands with each carrier. This segmentation simplifies the detection and measurement process by allowing the device to handle power control adjustments for each carrier independently, rather than attempting to manage all carriers simultaneously as a single complex system.
Solution Approach 2:
The patent resolves the measurement difficulty by transitioning from a single-dimension power control approach to a multi-dimensional approach where each carrier has its own power control dimension. This allows the system to maintain high data rates across multiple carriers while simplifying the detection and measurement process through dimensional separation of power control management.
Data Source
AI summary
A wireless device receives, in a first subframe, a first downlink control information (DCI) indicating first uplink resources in one or more subframes comprising a third subframe. The wireless device receives, in a second subframe different from the first subframe, a second DCI indicating second uplink resources of the third subframe. The wireless device transmits, in the third subframe, a transport block according to parameters of the most recently received first DCI or second DCI.