IAB MT Frequency Band Selection via Signal Strength Comparison
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Solution Overview
Problem
Integrated Access and Backhaul (IAB) Mobile Terminals (MTs) do not efficiently select frequency bands based on comparative signal strength and lack effective mobility support for IAB links in wireless communication networks.
Innovation Solution
An IAB MT identifies its geographic location and determines the best New Radio Licensed (NR-L) and New Radio Unlicensed (NR-U) frequency bands by comparing received signal strengths, using a Backhaul Adaption Protocol (BAP) to select the NR-U band with the best signal strength after applying interference and other offsets, and establishes IAB links wirelessly over the selected NR-U frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If IAB MTs use NR-U bands for backhaul links, then bandwidth is increased, but service quality degrades during heavy use due to unlicensed shared nature
Solution Approach 1:
The patent changes the parameter of frequency band selection by introducing signal strength comparison between NR-L and NR-U bands. The IAB MT measures received signal strengths from both licensed and unlicensed bands and selects the band with stronger signal, dynamically adjusting the operating band based on signal conditions rather than fixed allocation.
Solution Approach 2:
The patent implements feedback mechanisms where the IAB MT continuously monitors and compares received signal strengths from both NR-L and NR-U bands. This feedback loop enables dynamic band selection, allowing the system to adapt to changing channel conditions and maintain reliable connectivity by switching to the band with better signal quality.
2Device complexity
If IAB MTs select frequency bands without comparative signal strength analysis, then device complexity is reduced, but frequency band selection efficiency deteriorates
Solution Approach 1:
The patent introduces signal strength as a key parameter for band selection, transforming the selection process from arbitrary or fixed to performance-based. By comparing received signal strengths (RSS) of both NR-L and NR-U bands, the system objectively determines the optimal band, improving selection efficiency without requiring complex algorithms.
3Device complexity
If IAB MTs do not support mobility effectively, then device complexity is reduced, but mobility support for IAB links deteriorates
Solution Approach 1:
The patent implements dynamic band selection that adapts to mobility conditions. As the IAB MT moves, it continuously monitors signal strengths from both NR-L and NR-U bands and switches bands based on current signal conditions, enabling effective mobility support without requiring complex handover procedures or centralized control.
Data Source
AI summary
An Integrated Access and Backhaul (IAB) Mobile Terminal (MT) identifies its geographic location and determines a New Radio Licensed (NR-L) frequency band and a New Radio Unlicensed (NR-U) frequency band based on the location. The IAB MT determines received signal strengths for the frequency bands. The IAB MT compares the received signal strengths to and select the NR-U frequency band. The IAB MT wirelessly exchanges network signaling over the NR-U frequency band and establishes an IAB link over the NR-U frequency band. A Radio Unit (RU) wirelessly exchanges user data with wireless User Equipment (UEs) and exchanges the user data with a Distributed Unit (DU). The DU exchanges the user data with the IAB MT. The IAB MT wirelessly exchanges the user data over the IAB link using the NR-U frequency band.