Dynamic Logical Channel Aggregation for Scattered Spectrum
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Solution Overview
Problem
LTE carrier aggregation is ineffective in systems with scattered, non-continuous bandwidth resources and dynamic spectrum changes, as it requires predetermined and continuous spectrum allocation, which does not adapt to varying user demands.
Innovation Solution
A system dynamically defines logical channels encompassing scattered spectrum pieces, aggregates them on-demand to meet traffic needs, and redefines channels based on available resources, allowing for cross-channel bandwidth provisioning compliant with LTE standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If LTE carrier aggregation is used to increase bandwidth, then user data rates are improved, but the system cannot adapt to scattered, non-continuous spectrum resources and dynamic spectrum changes
Solution Approach 1:
The system segments scattered spectrum resources into multiple virtual channels, each representing a contiguous portion of available spectrum. This allows the system to organize fragmented spectrum pieces into manageable units that can be dynamically aggregated, resolving the contradiction between maintaining contiguous channel structure and utilizing scattered spectrum resources.
Solution Approach 2:
The system dynamically creates, modifies, and aggregates virtual channels based on real-time spectrum availability and user demand. Virtual channels are not fixed but adapt to changing spectrum conditions, enabling the system to maintain high data rates while accommodating scattered and dynamic spectrum resources.
2Quantity of substance
If multiple logical channels are aggregated to meet traffic needs, then bandwidth provisioning is improved, but system complexity increases
Solution Approach 1:
The system introduces virtual channels as an intermediary layer between physical spectrum resources and user services. This intermediary abstraction simplifies resource management by presenting a unified view of aggregated bandwidth to users while hiding the complexity of scattered spectrum aggregation from the service layer.
Solution Approach 2:
Virtual channels serve multiple functions: they represent scattered spectrum resources, enable dynamic aggregation, and provide a standardized interface for bandwidth provisioning. This multi-functionality reduces overall system complexity by consolidating multiple management tasks into a single unified mechanism.
3Device complexity
If predetermined continuous spectrum allocation is used for LTE carrier aggregation, then channel structure is simplified, but the system cannot adapt to varying user demands and spectrum availability
Solution Approach 1:
Virtual channels are dynamically created and configured based on real-time spectrum availability and user demand rather than being predetermined. This dynamic approach maintains relative simplicity by only creating channels when needed while adapting to changing conditions, resolving the contradiction between fixed structure and adaptability.
Solution Approach 2:
The system changes the parameters of virtual channels (bandwidth, frequency location, aggregation level) based on spectrum availability and traffic demand. This parameter-based flexibility allows the system to maintain a simple channel structure while adapting to varying conditions through parameter adjustment rather than structural redesign.
Data Source
AI summary
One embodiment of the present invention provides a system for dynamic, on-demand, cross-channel bandwidth provisioning in a wireless communication system. During operation, the system determines, by a scheduler, bandwidth resources that are available in the wireless communication system. The available bandwidth resources comprise a plurality of scattered spectrum pieces. The system defines one or more logical channels that encompass the scattered spectrum pieces, aggregates multiple logical channels in response to determining that spectrum pieces encompassed by a single logical channel do not meet traffic need, and provisions a user or a service using spectrum pieces located within the aggregated multiple logical channels, thereby facilitating on-demand, cross-channel bandwidth provisioning.