Wireless Communication for End Node Using mmWave Beamforming
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Solution Overview
Problem
Current wireless communication systems, particularly Wi-Fi and cellular systems, face challenges in providing high-capacity communication to fast-moving vehicles due to limitations in frequency band usage and mobility support, especially with millimeter-wave (mmWave) technology, which requires efficient air interface resource management and frequent handovers in dynamic environments.
Innovation Solution
A communication system that employs beamform-based mmWave radio communication with directional antennas, utilizing a combination of frequency channels and transmission schemes to efficiently manage links and reduce scanning time for suitable access points, allowing for fast and reliable identification of target access points and improved resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If millimeter-wave (mmWave) directional communication is used to increase capacity, then air interface resource utilization is improved, but link stability deteriorates due to frequent handovers and changing propagation conditions
Solution Approach 1:
The system performs preliminary scanning and identification of candidate access points before actual handover is needed. The end node continuously monitors and evaluates potential target access points, preparing handover candidates in advance to ensure seamless transition when link conditions deteriorate, thus maintaining link stability while utilizing mmWave resources efficiently
Solution Approach 2:
The system dynamically adapts beamforming parameters, transmission power, and handover thresholds based on real-time propagation conditions. The directional beams are continuously adjusted to track the optimal path between end node and access points, allowing the system to respond to changing conditions while maintaining stable connections and maximizing air interface resource utilization
2Loss of time
If scanning time for target access points is reduced to support fast mobility, then handover speed is improved, but identification accuracy deteriorates
Solution Approach 1:
The scanning process is segmented into multiple phases: initial rapid scanning to identify candidate access points, followed by focused evaluation of only those candidates. This segmented approach allows the system to quickly narrow down the search space and then perform more thorough assessment of selected candidates, reducing overall scanning time while maintaining identification accuracy
Solution Approach 2:
The system performs preliminary beam alignment and signal quality assessment during the scanning phase, preparing candidate information in advance. This preliminary action allows the end node to have ready-to-use handover candidates with pre-evaluated metrics, enabling fast handover execution without sacrificing identification accuracy
3Device complexity
If handover procedures are simplified to reduce complexity, then ease of operation is improved, but data connectivity interruption increases
Solution Approach 1:
The system establishes preliminary connections with candidate access points before terminating the current connection. The end node performs make-before-break handover by setting up the new link in advance, ensuring that data connectivity is maintained throughout the transition, thus reducing interruption while keeping procedures relatively simple
Solution Approach 2:
The system maintains continuous data transmission during handover by switching between active links seamlessly. The end node keeps the current link active while establishing the new link, and transitions data flow without interruption, ensuring continuous useful action throughout the handover process
Data Source
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AI summary
A communication system supports communication between an end node (101) and a remote correspondent node (105) via a fixed network (107) which comprises a plurality of wireless access points (109) with a directional antenna arrangement for mm wave radio communication using directional beams. A wireless modem (111, 113, 701, 703) employs electronically steerable beamforming directional antennas for establishing mm wave radio communication links to the access points (109). The air interface communication may use a frequency channel selected from a set of available frequency channels and using a transmission scheme from a set of available transmission schemes. The access points (109) transmit a first beacon data set in a frequency channel using a common transmission scheme and a second beacon data set using a different transmission scheme which is also used for data communication. The first beacon data set comprises an indication of the transmission schemes used for data communication for the access point (109).