Low SNR Physical Channel Segmentation for Wireless Coverage
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Solution Overview
Problem
Wireless communication networks face challenges in supporting remote devices that require low signal-to-noise ratio (SNR) operation and low power consumption, as existing technologies are limited in extending coverage and spectral efficiency for devices operating at lower SNRs.
Innovation Solution
The implementation of additional physical channels with lower minimum SNRs, such as the Machine PDCCH and M-PDSCH, which provide more redundancy and are transmitted in specific regions or bandwidths, along with the use of multiple instances of these channels to enhance reliability and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing physical channels are used for communication, then spectral efficiency is maintained, but remote devices cannot operate reliably at lower SNRs
Solution Approach 1:
The patent segments the communication channel by introducing a second physical channel with different characteristics (lower minimum SNR requirement) alongside the existing first physical channel. This segmentation allows the system to serve different device types with different SNR requirements, enabling remote devices to operate reliably at lower SNRs while maintaining compatibility with existing devices
Solution Approach 2:
The patent applies local quality by configuring the second physical channel with specific local characteristics (lower code rate, more redundancy, transmitted in specific bandwidth portions) that are optimized for low-SNR remote devices, while the first physical channel maintains its original characteristics for other devices. This localized optimization enables reliable communication for remote devices without affecting the performance of other devices in the network
2Area of stationary object
If the second physical channel is transmitted across the entire system bandwidth, then coverage is maximized, but power consumption increases
Solution Approach 1:
The patent restricts the second physical channel to specific portions of the system bandwidth rather than transmitting across the entire bandwidth. This localized transmission reduces the power consumption required for remote devices while maintaining adequate coverage for low-SNR operation. Remote devices only need to monitor these specific bandwidth portions, reducing their energy expenditure
3Reliability
If multiple physical channels are transmitted, then system complexity increases, but communication reliability for remote devices improves
Solution Approach 1:
The patent segments device categories into remote devices (using the second physical channel) and other devices (using the first physical channel), with clear segmentation criteria based on SNR requirements and device categories. This segmentation simplifies channel management by providing clear rules for channel selection and configuration, reducing system complexity despite the presence of multiple channels
Data Source
AI summary
Techniques for supporting communication for wireless devices in a wireless network are described. The wireless network may support a first physical channel having a first minimum SNR for reliable reception. Some wireless devices may require operation at a lower SNR. In an aspect, low SNR operation may be supported by transmitting data on a second physical channel that can be reliably received at a second minimum SNR that is lower than the first minimum SNR. In another aspect, low SNR operation may be supported by transmitting data on both the first and second physical channels. In yet another aspect, low SNR operation may be supported by transmitting data in multiple instances of the first and/or second physical channel. In yet another aspect, low power operation may be supported by transmitting the second physical channel in a portion of the system bandwidth instead of across the entire system bandwidth.