Carrier Aggregation Selection Using Group Delay and Insertion Loss
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Solution Overview
Problem
LTE networks face challenges in selecting optimal component carriers for carrier aggregation due to variations in signal quality and reliability, primarily caused by group delay and insertion loss, which affect the overall performance of data transmissions between base stations and user equipment.
Innovation Solution
A base station determines the requirement for carrier aggregation and selects primary and secondary component carriers based on metrics such as group delay, group delay variation, insertion loss, receive power, transmit power, and frequency to ensure high-quality and reliable data transmission by prioritizing carriers with lower group delay variation or insertion loss, and allocating them for carrier aggregation transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple component carriers are aggregated to increase bandwidth, then transmission bandwidth is improved, but signal quality and reliability deteriorate due to variations in group delay and insertion loss across carriers
Solution Approach 1:
The patent applies parameter changes by dynamically selecting component carriers based on their group delay and insertion loss characteristics. The base station evaluates multiple carriers and selects combinations that optimize both bandwidth and signal quality by adjusting which carriers are active in the aggregation set, rather than using all available carriers continuously.
Solution Approach 2:
The carrier selection process is dynamic rather than static. The base station continuously monitors group delay and insertion loss parameters and adjusts the component carrier aggregation configuration in response to changing channel conditions, ensuring optimal signal quality while maintaining high bandwidth utilization.
2Area of stationary object
If carriers with different group delay characteristics are aggregated, then bandwidth is increased, but transmission reliability deteriorates
Solution Approach 1:
The patent changes the selection criteria parameter by prioritizing carriers with similar group delay characteristics when forming component carrier aggregations. This parameter-based selection ensures that aggregated carriers maintain consistent timing properties, thereby preserving transmission reliability while still achieving high bandwidth through carrier aggregation.
3Productivity
If more component carriers are used for aggregation, then data transmission capacity is improved, but complexity of carrier selection and management increases
Solution Approach 1:
The base station autonomously performs carrier selection by evaluating group delay and insertion loss parameters without requiring complex external coordination or manual configuration. The system self-manages the carrier aggregation configuration by automatically identifying suitable component carriers based on measured parameters, reducing operational complexity while maintaining high transmission capacity.
Data Source
AI summary
In a wireless network comprising a plurality of carriers available for carrier aggregation transmissions between a base station and UE, the base station: (i) determines whether a requirement exists to transmit data between the UE and the base station via a carrier aggregation transmission; (ii) in response to determining that the carrier aggregation transmission requirement exists, selects a primary component carrier and one or more secondary component carriers from the plurality of carriers for the carrier aggregation transmission based on one or more of each carrier's receive power at the UE, transmit power at the base station, and frequency; (iii) allocates the selected primary and secondary component carriers to the carrier aggregation transmission; (iv) informs the UE of the allocation; and (v) executes the carrier aggregation transmission according to the allocation.