Beam-Steered Wireless Transmissions for Licensed Spectrum Coexistence
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Solution Overview
Problem
Existing wireless communication systems face challenges in coexisting with licensed entities on the same frequency band without causing substantial interference, especially when unlicensed users cannot directly detect the transmissions of licensed systems.
Innovation Solution
The implementation of a spectrum access system (SAS) that utilizes spectrum usage data from a database to enable unlicensed devices to conduct transmissions in frequency bands adjacent to licensed sub-bands, while modifying transmission power and using beam steering techniques to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If unlicensed users transmit on the same frequency band as licensed entities, then spectrum utilization efficiency is improved, but interference to licensed entities increases
Solution Approach 1:
The patent applies local quality by directing unlicensed transmissions only in specific spatial directions that avoid licensed entity reception areas. The beamforming technology creates directionally selective transmission zones, allowing unlicensed users to transmit locally in safe directions while preventing interference to licensed entities in other directions.
Solution Approach 2:
The patent transitions from frequency-domain spectrum sharing to spatial-domain sharing by introducing beam steering characteristics. This adds a spatial dimension to spectrum utilization, allowing multiple users to share the same frequency band by transmitting in different spatial directions, thereby improving spectrum efficiency without causing interference.
2Object-generated harmful factors
If unlicensed users are prohibited from transmitting on licensed bands, then interference to licensed entities is reduced, but spectrum utilization efficiency deteriorates
Solution Approach 1:
The patent introduces spectrum usage data from a database as an intermediary mechanism. This database provides unlicensed users with information about licensed entity transmissions, enabling them to make informed decisions about beam steering directions and transmission timing, thus avoiding interference while utilizing the spectrum efficiently.
Solution Approach 2:
The patent applies preliminary action by having unlicensed users query the spectrum usage database before transmitting. This allows them to pre-determine safe transmission directions and timing based on licensed entity activity patterns, preventing interference before it occurs while maintaining spectrum utilization.
3Reliability
If unlicensed users directly detect licensed entity transmissions, then interference avoidance capability is improved, but detection complexity increases
Solution Approach 1:
The patent uses the spectrum usage database as an intermediary that consolidates licensed entity transmission information. Instead of requiring unlicensed users to directly detect and track licensed transmissions, the database provides pre-processed spectrum usage data, significantly reducing detection complexity while maintaining reliable interference avoidance.
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 allows for efficient coexistence between licensed and unlicensed users by reducing interference and maximizing communication throughput, thereby optimizing the use of the electromagnetic spectrum.
Implementation Method 1
determining beam steering characteristics for wireless transmissions of the integrated circuit package within the frequency band using the spectrum usage data. The beam steering characteristics are determined using the transmission characteristics for the licensed entity and configured to reduce interference with the transmissions of the licensed entity
Data Source
AI summary
Systems, methods, and devices for conducting wireless communication are provided. One method includes identifying a location of a device and obtaining spectrum usage data from a database. The spectrum usage data indicates a licensed entity licensed within an area including the location of the device to communicate across a first sub-band of frequencies within a frequency band, and one or more transmission characteristics of the transmissions of the licensed entity. The method further includes determining beam steering characteristics for wireless transmissions of the device within the frequency band using the spectrum usage data. The beam steering characteristics are determined using the transmission characteristics for the licensed entity and configured to reduce interference with the transmissions of the licensed entity within the frequency band caused by the wireless transmissions of the device. The method further includes conducting wireless transmissions over the frequency band using the beam steering characteristics.