Millimeter Wave Wireless Systems Licensed Unlicensed Spectrum
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Solution Overview
Problem
Current wireless communication systems face challenges in managing growing data traffic with limited bandwidth, particularly in using millimeter wave frequencies for both licensed and unlicensed spectra efficiently, leading to inefficiencies in signal transmission and reception.
Innovation Solution
A wireless system utilizing a radio base station and communications device with high-gain antenna arrays and power amplifiers for licensed millimeter wave bands in the downlink direction and low-gain, low-power transmitters for unlicensed bands in the uplink direction, employing MIMO technology and signal processing to optimize data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high transmit EIRP is used for licensed millimeter wave signals, then signal transmission quality is improved, but device complexity and cost increase
Solution Approach 1:
The patent segments the wireless communication system into two distinct parts: a radio base station equipped with high-gain antenna arrays and power amplifiers for licensed band transmission, and communication devices with low-gain, low-power transmitters for unlicensed band reception. This segmentation allows the complex high-power transmission functionality to be confined to the base station infrastructure, while communication devices remain simple and cost-effective.
Solution Approach 2:
The patent applies different quality levels to different components of the system. The radio base station uses high-gain antenna arrays and power amplifiers optimized for licensed millimeter wave bands, while communication devices use low-gain, low-power transmitters for unlicensed bands. This local differentiation of quality characteristics resolves the contradiction by concentrating complexity only where necessary.
2Strength
If high-gain antenna arrays and power amplifiers are used, then signal strength is improved, but cost of infrastructure increases
Solution Approach 1:
The patent divides the high-signal-strength functionality into the radio base station infrastructure, which houses the high-gain antenna arrays and power amplifiers. Communication devices only require simple low-gain transmitters. This segmentation concentrates the expensive high-performance components in the fixed infrastructure rather than in every mobile device, reducing overall system cost.
Solution Approach 2:
The patent inverts the traditional approach by having the base station transmit on licensed bands with high power while devices transmit on unlicensed bands with low power. This inversion allows the system to achieve high signal strength through the infrastructure rather than through expensive device hardware.
3Productivity
If licensed and unlicensed frequency bands are used simultaneously, then spectrum utilization is improved, but signal interference increases
Solution Approach 1:
The patent segments the frequency spectrum usage by function and direction: licensed millimeter wave bands are used for downlink transmission from base station to device, while unlicensed millimeter wave bands are used for uplink transmission from device to base station. This segmentation of spectrum resources by transmission direction eliminates interference between the two bands while maximizing overall spectrum utilization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances signal strength and sensitivity, allowing for efficient data transmission and reception while complying with spectrum sharing rules, reducing the complexity and cost of communication devices and infrastructure.
Implementation Method 1
a power amplifier configured to amplify the first millimeter wave band signal
Implementation Method 2
a low noise amplifier configured to amplify the second millimeter wave band signal
Implementation Method 3
a high gain transmit antenna array configured to transmit the first millimeter wave band signal
Implementation Method 4
a high receive gain antenna array configured to receive the second millimeter wave band signal
Data Source
AI summary
A method of wireless communication includes transmitting in a downlink direction on a licensed millimeter wave band, by a radio base station, a first millimeter wave band signal at high transmit equivalent isotropically radiated power (EIRP) using a multiple input multiple output transmit antenna array. The method includes receiving by a communications device the first millimeter wave band signal. The method includes transmitting in an uplink direction on an unlicensed millimeter wave band, by the communications device, a second millimeter wave band signal at low transmit equivalent isotropically radiated power (EIRP) using a multiple input multiple output transmit antenna array. The method includes receiving on the unlicensed millimeter wave band, by the radio base station, the second millimeter wave band signal at a high receive gain using a multiple input multiple output receive antenna array.