Uplink Transmit Power Control in Unlicensed Bands
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Solution Overview
Problem
In wireless communication systems using unlicensed bands, interference issues arise due to competitive installations among service providers, leading to unpredictable quality of service and mobility limitations, especially when multiple communication protocols coexist, as they contend for channels without guaranteed exclusive use.
Innovation Solution
A method and apparatus for controlling uplink transmit power in wireless communication systems to ensure it does not exceed maximum power spectral density (PSD) and total maximum transmit power, thereby reducing interference across various communication protocols in unlicensed bands by determining and adjusting the transmit power of uplink signals in serving cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple communication protocols use unlicensed bands in a contention-based manner, then channel access flexibility is improved, but interference between protocols increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmit power levels based on protocol type and channel conditions. Different protocols (LTE-U, LAA, WLAN) are assigned different power parameters to reduce mutual interference while maintaining fair channel access in the unlicensed band
2Reliability
If transmit power is increased to improve communication quality, then signal coverage is improved, but interference with other protocols increases
Solution Approach 1:
The patent implements dynamics by making transmit power adjustable and adaptive rather than fixed. The base station dynamically controls power levels per protocol type and per channel condition, allowing optimization of communication quality while minimizing interference to other protocols in real-time
3Object-generated harmful factors
If power spectral density limits are enforced, then interference is reduced, but available transmit power is reduced
Solution Approach 1:
The patent applies local quality by implementing different power spectral density limits for different protocols and different spatial locations. Each protocol type receives customized power constraints based on its interference characteristics, and power is allocated differently across various channels and time slots to optimize the trade-off between interference reduction and available power
Data Source
AI summary
Provided are a method and a device for controlling transmission power in a wireless communication system. The device conducts an adjustment such that the transmission power of an UL (uplink) signal, with respect to a serving cell in an unlicensed band, does not exceed the maximum PSD (power spectral density) of the unlicensed band.