Carrier Aggregation in Unlicensed Bands via Interference Coordination
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Solution Overview
Problem
Current LTE-Advanced systems are limited to communicating only in licensed bands, lacking efficient mechanisms to coordinate and deploy LTE communications in unlicensed bands like ISM bands, which are prone to interference from WiFi devices and other LTE networks, hindering network providers' ability to utilize secondary carriers for enhanced coverage.
Innovation Solution
The proposed solution involves a method for carrier aggregation deployment and organization in unlicensed bands, where a base station scans and reports signal measurements, identifies usable channels, and uses a secondary cell drop/add mechanism to hop communication between channels, enabling coordination across different network providers and avoiding interference through RRC messages and new X2 interface procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If LTE networks deploy secondary carriers in unlicensed bands to enhance coverage, then network coverage and throughput are improved, but interference from WiFi devices and other LTE networks increases
Solution Approach 1:
The patent implements a feedback mechanism where base stations scan unlicensed bands, report signal measurements to a coordinator, receive coordination decisions, and adjust their channel usage accordingly. This closed-loop feedback system enables dynamic interference management while maintaining expanded coverage in unlicensed bands.
Solution Approach 2:
The patent introduces a coordinator entity that acts as an intermediary between multiple base stations deploying in unlicensed bands. This coordinator receives scanning results from base stations, performs centralized channel assignment, and distributes coordination decisions, thereby managing interference across the network while enabling unlicensed band deployment.
2Adaptability or versatility
If multiple network providers deploy LTE in unlicensed bands independently, then each provider can utilize secondary carriers for enhanced coverage, but coordination between different network providers is lacking leading to increased interference
Solution Approach 1:
The patent creates a universal coordination mechanism that works across different network providers through standardized X2 interface procedures. The coordinator entity and scanning/reporting framework provide multi-functional support for inter-provider coordination, enabling carrier aggregation while managing complexity through a unified approach.
Solution Approach 2:
The patent segments the coordination function from individual base stations and concentrates it in a dedicated coordinator entity. This segmentation separates the complex coordination tasks from regular base station operations, allowing each base station to focus on carrier aggregation while the coordinator handles inter-provider coordination complexity.
3Reliability
If base stations scan and identify usable channels in unlicensed bands, then interference avoidance is improved, but the scanning and coordination process increases system complexity
Solution Approach 1:
The patent implements preliminary scanning and channel identification actions before actual data transmission begins. Base stations perform scanning and reporting in advance, allowing the coordinator to pre-determine optimal channel assignments and avoid interference proactively rather than reactively, improving reliability while managing complexity through advance preparation.
Data Source
AI summary
Described herein are systems and methods for carrier aggregation deployment and organization in unlicensed bands. A method may comprise scanning, by a transceiver within a base station, channels in a band of interest, reporting, by the transceiver, signal measurement information to the base station, cell searching, by the transceiver, channels in the band of interest, determining channel information for neighboring each channel, and transmitting, by the transceiver, the channel information to the base station.