LTE Channel Selection in Unlicensed Bands
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The deployment of neighborhood small cells (NSCs) on unlicensed spectrum bands causes interference to non-cellular communications, such as Wi-Fi, due to the higher spectral efficiency of LTE compared to Wi-Fi, leading to spectrum shortages and interference issues.
Innovation Solution
A method involving a network entity that operates in a first mode using a first radio access technology (RAT1), collects interference measurements, and switches to a second mode using a second RAT2, utilizing these measurements to minimize interference by selecting optimal channels based on metrics like RSSI and duty cycle, thereby reducing interference to non-cellular communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LTE is deployed on unlicensed spectrum bands to increase spectral efficiency, then spectral efficiency is improved, but interference to non-cellular communications (e.g., Wi-Fi) increases
Solution Approach 1:
The network entity performs channel measurements and builds an interference database before actually deploying LTE on unlicensed bands. By measuring Wi-Fi interference levels on different channels in advance and storing this information, the system can proactively select channels with lower interference, preventing harmful interference before it occurs.
Solution Approach 2:
The system continuously measures interference levels on unlicensed channels and uses this feedback to dynamically select optimal channels for LTE operation. The interference database is updated based on ongoing measurements, allowing the system to adapt to changing interference conditions and maintain low interference levels while achieving high spectral efficiency.
2Object-generated harmful factors
If interference measurements are collected and channel selection is optimized to reduce interference, then interference to non-cellular communications is reduced, but device complexity increases
Solution Approach 1:
The network entity autonomously performs interference measurements, builds the interference database, and selects channels without requiring complex external coordination or manual configuration. The system serves itself by automatically adapting to interference conditions, which reduces the need for complex network-wide coordination mechanisms.
Solution Approach 2:
The interference measurement and channel selection functionality is extracted as a separate database and process from the main LTE operation. By isolating the interference management functions into a dedicated database structure and measurement process, the complexity is contained and managed separately, allowing the core LTE functionality to remain relatively simple while still achieving interference reduction.
Data Source
AI summary
Described herein are techniques for reducing interference to non-cellular communications on an unlicensed band by a network entity sending/receiving cellular communications on the unlicensed band. For example, the technique may involve operating in a first mode using a first radio access technology (RAT1), and collecting interference measurements for interference to or from at least one mobile device while in the first mode. The technique may also involve switching to a second mode and using a second radio access technology (RAT2), and using the interference measurements from the first mode to minimize interference caused or experienced by the network entity in the second mode.