Directional Antenna Beam Steering for Late Entrant Node Discovery
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Solution Overview
Problem
High path loss in radio frequency communication networks, especially at millimeter wave frequencies, makes it difficult to establish communication links, particularly with mobile nodes, due to the need for precise antenna alignment and the limitations of directional antennas which can create blind spots and reduce effective range.
Innovation Solution
A method using directional antennas with digital data processing gain and time difference of arrival analysis to detect and locate late entrant nodes, allowing for automatic beam steering and overcoming alignment challenges, enabling continuous detection and communication with mobile nodes even at high gain, narrow beam widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If directional antennas with high gain are used to overcome path loss, then communication range is extended, but alignment precision requirements increase making link establishment more difficult
Solution Approach 1:
The system performs preliminary actions by having the mobile node transmit a discovery signal before formal link establishment. The fixed node receives this signal and calculates arrival angles and TDOA to pre-determine beam steering vectors, so that when the mobile node enters the network, the directional antenna is already oriented toward it, eliminating the need for manual alignment
Solution Approach 2:
The patent replaces mechanical alignment procedures with electronic beam steering. Instead of physically adjusting antenna orientation based on GPS coordinates, the system uses signal processing to electronically steer the beam toward the mobile node by calculating arrival angles and applying phase shifts to antenna elements, substituting mechanical precision requirements with electronic control
2Reliability
If omnidirectional antennas are used to improve link establishment probability with mobile nodes, then alignment problems are eliminated, but gain is reduced limiting effective range
Solution Approach 1:
The system dynamically adapts the antenna radiation pattern based on the operational phase. During discovery, the fixed node uses omnidirectional reception to detect signals from any direction. Once the mobile node's position is determined through TDOA and arrival angle analysis, the system dynamically switches to a directional beam pattern steered toward the mobile node, combining the benefits of both omnidirectional and directional operation
Solution Approach 2:
The discovery signal transmission occurs periodically or at scheduled intervals, allowing the fixed node to repeatedly attempt detection and positioning. This periodic action increases the probability of successful link establishment while maintaining high gain directional beams for the duration of each discovery attempt
3Manufacturing precision
If mechanical and optical alignment techniques are used for fixed site nodes, then alignment accuracy is improved, but installation cost and complexity increase
Solution Approach 1:
The system enables self-alignment where the installation process automatically determines the correct beam steering vector without requiring technician intervention. The mobile node's transmission serves as the reference signal, and the fixed node's receiver automatically calculates the arrival angle and TDOA to self-determine the optimal beam orientation, eliminating manual alignment operations
Solution Approach 2:
The discovery signal acts as an intermediary that carries positioning information. Instead of directly measuring physical alignment parameters, the system uses the transmitted signal as a mediator to indirectly determine the geometric relationship between fixed and mobile nodes, simplifying the installation process
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 facilitates automatic link establishment with mobile nodes in millimeter wave communication systems, improving network performance by maintaining high gain while enabling continuous detection of new nodes joining the network, even in scenarios with high path loss.
Implementation Method 1
using a first directional antenna associated with a first network node to facilitate a radio network communication session (RNCS) with at least a second network node
Implementation Method 2
Digital data processing gain is applied to the first signal received by the first directional antenna to facilitate detection of the digital data sequence at receive signal strength levels which are below a noise floor
Implementation Method 3
a time difference of arrival (TDOA) analysis is performed if the digital data sequence transmitted from the late entrant node is also detected in a second signal contemporaneously received at a second directional antenna
Implementation Method 4
estimate at least one beam-steering vector necessary for electronically steering a boresight of a transmit and receive antenna beam toward the LEN
Data Source
AI summary
Method for discovering the presence of a communication node which seeks participation in a radio communication network. The method involves receiving with a first directional antenna a first signal from a late entrant node (LEN) concurrent with a radio network communication session (RNCS). Digital data processing gain is applied to the first signal to facilitate detection of a digital data sequence. A time difference of arrival (TDOA) analysis is performed if the digital data sequence transmitted from the late entrant node is also detected in a second signal contemporaneously received at a second directional antenna. The TDOA analysis is used to estimate at least one beam-steering vector.