Random Access Signal Format Selection for IoT Path Loss
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Solution Overview
Problem
Current wireless communication systems, particularly in IoT applications, face inefficiencies in random access due to high battery power consumption and inadequate support for infrequent, small data transfers, which are exacerbated by poor indoor coverage and higher costs compared to traditional GPRS systems.
Innovation Solution
The implementation of a method where devices select a signal format from multiple formats corresponding to different coding and modulation schemes based on path loss and transmit power capability to optimize random access, reducing transmission time and power consumption, and employing flexible time-frequency resource utilization to enhance communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional random access methods are used in wireless communication systems, then devices can establish connection with base stations, but battery power consumption is high and communication efficiency is low for IoT applications
Solution Approach 1:
The patent implements dynamic signal format selection where devices adaptively choose between different signal formats (first format with longer duration/lower rate, second format with shorter duration/higher rate) based on real-time path loss conditions. This dynamic adaptation allows devices to optimize their random access transmissions by selecting the most energy-efficient format for current channel conditions, directly reducing battery power consumption while maintaining communication efficiency.
Solution Approach 2:
The patent changes key transmission parameters including signal format duration, coding rate, and modulation scheme based on path loss measurements. By adjusting these parameters dynamically - using more robust but energy-intensive formats only when necessary (high path loss) and efficient formats when conditions permit (low path loss) - the system optimizes the trade-off between communication reliability and energy consumption for IoT devices.
2Reliability
If robust signal formats with longer transmission duration are used, then reliability is improved for devices with high path loss, but transmission time increases and productivity decreases
Solution Approach 1:
The patent implements parameter adaptation where signal format duration, coding rate, and modulation depth are dynamically adjusted based on measured path loss. Devices experiencing high path loss automatically select formats with longer duration and more robust coding to ensure reliable delivery, while devices with good channel conditions use shorter, more efficient formats. This parameter changes principle resolves the contradiction by making reliability adaptive rather than uniform across all devices.
Solution Approach 2:
The system transitions from static signal format assignment to dynamic format selection based on real-time channel conditions. Devices continuously monitor path loss and switch between signal formats accordingly, ensuring that reliability is optimized only when necessary (for devices in poor coverage) while maintaining high productivity for devices in good coverage, thus resolving the trade-off between reliability and transmission efficiency.
3Adaptability or versatility
If uniform random access procedures are used for all devices, then system complexity is low, but adaptability to different path loss conditions and device capabilities is poor
Solution Approach 1:
The patent introduces adaptability through parameter changes by enabling devices to select from multiple signal formats with different characteristics (duration, coding rate, modulation). The base station similarly adapts by configuring and monitoring multiple formats. This parameter diversity allows the system to adapt to varying path loss conditions and device capabilities while maintaining manageable complexity through standardized format definitions and selection criteria based on measurable parameters like path loss.
Data Source
AI summary
A method, an apparatus, and a computer program product for wireless communication are provided. According to one embodiment, a method of operating a device includes: selecting a signal format from a plurality of signal formats, each of the plurality of signal formats corresponding to a respective coding and modulation scheme of a plurality of coding and modulation schemes; and sending a request for random access to a base station according to the selected signal format.