Femto Cell Bandwidth Adaptation via Sub-band Selection
Solution Overview
Problem
In dense femto cell environments, existing technologies face challenges in differentiating and coordinating between various layers of femto cells, leading to interference issues and inefficient use of LTE channels, particularly in scenarios where the same channel is used across different layers, resulting in poor signal-to-interference noise ratio and suboptimal bandwidth adaptation for maximum throughput.
Innovation Solution
A bandwidth-based femto cell management system that dynamically evaluates and selects channel bandwidth and frequency for transmission based on data throughput and channel quality information, using a femto cell access point device to rank frequency sub-bands and choose the optimal bandwidth that exceeds the broadband channel's data throughput, thereby reducing interference and enhancing channel utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the same channel is used across different layers of femto cells, then channel utilization is simplified, but interference increases and signal-to-interference noise ratio deteriorates
Solution Approach 1:
The patent segments the frequency spectrum into multiple sub-bands and assigns different sub-bands to different layers of femto cells. This segmentation prevents interference between layers while maintaining efficient channel utilization through structured frequency allocation.
Solution Approach 2:
The patent introduces a new dimension of frequency sub-band allocation to resolve the contradiction. By allocating resources in the frequency domain (sub-bands) rather than using the same channel across all layers, the system achieves both good signal-to-interference ratio and effective channel utilization.
2Productivity
If bandwidth is increased for femto cell transmission, then throughput capacity improves, but interference with other layers increases
Solution Approach 1:
The patent divides the available bandwidth into multiple sub-bands and allocates specific sub-bands to different femto cell layers. This allows each layer to utilize sufficient bandwidth for high throughput while preventing interference to other layers through frequency separation.
Solution Approach 2:
The patent applies local quality by assigning different frequency sub-band characteristics to different layers. Each layer receives optimized frequency resources tailored to its specific requirements, achieving high throughput locally while maintaining overall network harmony.
3Adaptability or versatility
If dynamic bandwidth selection is implemented, then bandwidth adaptation to throughput capacity improves, but system complexity increases
Solution Approach 1:
The patent implements dynamic bandwidth selection where the femto cell access point device evaluates channel quality information and data throughput to select optimal bandwidth and frequency sub-bands. This dynamic adaptation allows the system to respond to changing conditions while the automated evaluation process manages complexity.
Solution Approach 2:
The patent employs feedback mechanisms where channel quality information and throughput measurements are continuously evaluated to inform bandwidth selection decisions. This feedback loop enables adaptive bandwidth management without requiring complex manual configuration.
Data Source
AI summary
A femto cell access point device (FAPD) selects channel bandwidth and frequency for transmission based on bandwidth of a broadband channel between the femto cell and a core network. A method can include determining a data throughput associated with a broadband channel communicatively coupling the access point device and a network device of a network, and evaluating channel information associated with a plurality of frequency sub-bands. The access point device can be configurable to communicate over the plurality of frequency sub-bands. The method can also include selecting a transmission parameter for a mobile device, wherein the selecting is based on the data throughput, and wherein the transmission parameter comprises information representing a selected set of the plurality of frequency sub-bands. The broadband channel can be a digital subscriber line (DSL) channel in some embodiments.