Base Station Downlink Power Control via Transport Block Scaling
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Solution Overview
Problem
In 5G wireless communication systems, existing methods for controlling downlink transmit power are inefficient, particularly in densely populated areas with many base stations, as they require complex measurements and reporting, which are impractical due to terminal measurement limitations and interference from neighboring cells, leading to performance degradation and inter-cell interference.
Innovation Solution
A method and apparatus for a base station to dynamically adjust downlink transmit power by decreasing the transport block size and determining a transmit signal scaling factor for short data packets, using a downlink transmit power control device that includes blocks for spectral efficiency decrease, power calculation, and baseband transmission, allowing for reduced power transmission only when necessary, thereby minimizing interference and improving reception quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing methods for controlling downlink transmit power are used, then power transmission is maintained at standard levels, but interference increases and network quality deteriorates in densely populated areas
Solution Approach 1:
The patent implements dynamic transmit power adjustment by introducing a power scaling factor that varies based on transport block size. When the transport block size is small (indicating low data traffic), the scaling factor reduces transmit power accordingly. This dynamic adaptation allows the system to automatically adjust power levels to match actual network conditions, reducing interference in densely populated areas while maintaining reliability when needed.
2Loss of energy
If transmit power is reduced for small data packets, then interference is minimized, but power transmission efficiency improves
Solution Approach 1:
The patent changes the power transmission parameter by introducing a scaling factor that is calculated based on the ratio of the transport block size to a reference size. When the transport block size is small, the scaling factor reduces the transmit power, thereby improving power transmission efficiency and simultaneously reducing interference generated to other cells. This parameter adjustment creates a direct correlation between data packet size and transmit power level.
3Measurement precision
If complex measurements and reporting are implemented for power control, then power control precision improves, but terminal measurement limitations and inter-cell interference make it impractical
Solution Approach 1:
The patent extracts the power control decision-making function from the terminal and relocates it to the base station. Instead of requiring terminals to perform complex measurements and reporting, the base station autonomously determines the power scaling factor based on the transport block size it needs to transmit. This extraction eliminates the need for complex terminal measurements and reporting while maintaining power control precision at the base station level.
Data Source
AI summary
The disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting a higher data transfer rate than a 4th generation (4G) communication system such as Long Term Evolution (LTE). A method performed by a base station in a wireless communication system is provided. The method includes decreasing a size of a transport block for a data packet when a size of a downlink data packet is less than or equal to a size of a predetermined minimum allocation resource, determining a transmit signal scaling factor for decreasing transmit power of the data packet, and determining the transmit power of the data packet, based on the transmit signal scaling factor.