Uplink Channel Selection via Swept Syncs and Reciprocity
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Solution Overview
Problem
Existing communication systems, such as LTE-M and NB-IoT, fail to provide global scale connectivity and cost-effective solutions for the Global Asset Tracking and Monitoring Market, particularly in indoor environments due to limitations in signal penetration and cost considerations.
Innovation Solution
The Doppler Multichannel Spread Spectrum (DMSS) technology employs a method where endpoints receive swept syncs on different channels, measure signal power, interpolate optimal channels for uplink and downlink data transmission, and leverage channel reciprocity to enhance communication efficiency, using frequency diversity and power control schemes to optimize signal gain and reduce latency and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTE-M or NB-IoT systems are used for global asset tracking, then cellular coverage is provided, but global indoor penetration and cost-effectiveness are insufficient
Solution Approach 1:
The patent changes the fundamental parameters of the communication system by using spread spectrum modulation with Doppler compensation instead of traditional cellular modulation schemes. This enables operation in indoor environments with better signal penetration while using non-terrestrial infrastructure to reduce deployment costs.
Solution Approach 2:
The patent introduces satellite or aerial vehicles as intermediary communication nodes between ground-based asset trackers and the core network. This intermediary approach provides global coverage including indoor penetration without requiring extensive terrestrial base station infrastructure.
2Reliability
If swept syncs are measured on multiple channels, then optimal uplink channel is determined, but processing complexity increases
Solution Approach 1:
The patent performs preliminary channel sounding by measuring swept syncs on multiple channels before actual data transmission. This preliminary action identifies the optimal uplink channel in advance, simplifying subsequent communication operations and reducing real-time processing complexity.
Solution Approach 2:
The endpoint device autonomously measures swept syncs, determines signal power, and selects the optimal uplink channel without requiring complex network coordination. This self-service approach reduces overall system complexity while achieving reliable signal gain.
3Productivity
If channel reciprocity is leveraged to determine downlink channel, then transmission efficiency is improved, but interpolation accuracy requirements increase
Solution Approach 1:
The patent uses feedback from uplink channel measurements to infer downlink channel characteristics through channel reciprocity. The system measures the uplink channel, interpolates the downlink channel based on this feedback, and continuously refines the interpolation accuracy through iterative measurements and adjustments.
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
DMSS achieves global indoor penetration with unprecedentedly low connectivity costs by selecting channels with signal gain, reducing latency and operational expenses through efficient power management and optimized data transmission, thereby addressing the limitations of existing systems.
Implementation Method 1
measuring, by the endpoint, a received signal power for each of the plurality of swept syncs
Implementation Method 2
receiving, by the endpoint, a downlink (DL) PDU on a second channel, wherein the second channel is based on the first channel to leverage channel reciprocity
Data Source
AI summary
An illustrated embodiment disclosed herein is a method including receiving, by an endpoint, a plurality of swept syncs, each swept sync being on a different channel, measuring, by the endpoint, a received signal power for each of the plurality of swept syncs, determining, by the endpoint, a first swept sync based on the received signal power, interpolating, from the first swept sync, a first channel for sending an uplink (UL) physical data unit (PDU), sending, by the endpoint, the UL PDU on the first channel, and receiving, by the endpoint, a downlink (DL) PDU on a second channel, wherein the second channel is based on the first channel to leverage channel reciprocity.