Inter-site Carrier Aggregation Uplink Control Information Routing
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Solution Overview
Problem
Current methods for enhancing small cell technology in cellular mobile communication systems face challenges in efficiently supporting increased data traffic and managing inter-site carrier aggregation, particularly with non-ideal backhaul connectivity and dual connectivity scenarios.
Innovation Solution
The method involves inter-site carrier aggregation, where terminals and base stations coordinate the transmission of uplink control information across macro and small cells, setting cell groups as primary and secondary, and managing dual connectivity with specific timing and frequency allocation strategies to optimize data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inter-site carrier aggregation is applied to enhance small cell capacity, then wireless network capacity increases, but system complexity increases due to coordination between multiple base stations
Solution Approach 1:
The patent segments the carrier aggregation system into primary cell groups and secondary cell groups, with each group managed by different base stations. This segmentation allows independent management of control information transmission for different cell groups, reducing the complexity of coordinating multiple base stations while still enabling enhanced network capacity through inter-site carrier aggregation.
2Productivity
If uplink control information is transmitted through multiple base stations, then data transmission efficiency improves, but transmission delay increases due to non-ideal backhaul connectivity
Solution Approach 1:
The patent introduces a mediator mechanism where the terminal selectively transmits uplink control information through intermediate base stations based on backhaul connectivity conditions. When backhaul connectivity is non-ideal, the terminal can choose to transmit control information through a different path or use alternative methods, thereby reducing transmission delay while maintaining data transmission efficiency.
3Reliability
If dual connectivity with multiple reception points is implemented, then service reliability improves, but timing coordination complexity increases
Solution Approach 1:
The patent applies dynamics by allowing the terminal to flexibly select which reception point to use for uplink transmission based on real-time conditions. The terminal can dynamically switch between different reception points and timing configurations, which simplifies timing coordination complexity while maintaining service reliability through dual connectivity with multiple reception points.
Data Source
AI summary
Disclosed is a method for enhancing a small cell. A method for enhancing a small cell in a terminal applying inter-site CA includes the steps of: causing a terminal to transmit the uplink control information (UCI) of at least one of the macro cells controlled by a macro cell base station through the macro cell; and causing the terminal to transmit the uplink control information of at least one of the small cells controlled by a small cell base station through the small cell.