Smart Antenna Frequency Reuse via Path Quality Assessment
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Solution Overview
Problem
High frequency and high data rate wireless communications systems face challenges in increasing system capacity due to scarce radio spectrum resources and high co-channel interference when frequency reuse is implemented, which degrades overall system performance.
Innovation Solution
A method involving a network coordinating device that obtains path quality information to determine co-existing communications paths and creates a concurrent access table, allowing pairs of communications devices to share the same frequency channel using smart antenna technology, thereby reducing co-channel interference and improving system capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency reuse is implemented to share radio spectrum resources, then system capacity is improved, but co-channel interference increases and system performance degrades
Solution Approach 1:
The patent applies local quality by using directional antennas to create spatially selective communication paths. Each communication path has specific transmit and receive beam directions that are optimized for that path, allowing frequency reuse in specific spatial locations while avoiding interference in other directions. This enables the system to achieve high capacity through frequency reuse while controlling co-channel interference through spatial localization.
Solution Approach 2:
The patent introduces spatial dimensionality by establishing multiple communication paths between device pairs with different beam directions. Instead of simply reusing frequencies, the system creates a three-dimensional spatial structure where multiple pairs can simultaneously use the same frequency channel along different spatial trajectories, thereby increasing system capacity while managing interference through spatial separation.
2Adaptability or versatility
If multiple communication paths are established between device pairs, then frequency reuse capability is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by having the network coordinating device pre-establish multiple communication paths between device pairs before actual data transmission occurs. The coordinating device assesses path quality information in advance and creates a concurrent access table that pre-determines which paths can coexist. This preliminary setup reduces the complexity of real-time scheduling decisions and enables efficient frequency reuse without requiring complex dynamic coordination during data transmission.
Data Source
AI summary
A method is provided for sharing a communications channel in a wireless communications system. A network coordinating device of the wireless network obtains a first path quality information of each of a first set of one or more communications paths between a first pair of communications devices. The coordinating device also obtains a second path quality information of each of a second set of communications paths between a second pair of communications devices. The coordinating device then determines one or more co-existing communications paths based on the first and the second path quality information in accordance with a predetermined rule. Finally, the coordinating device sends channel resource allocation information to the first pair and the second pair of communications devices to use corresponding co-existing communications paths such that the first pair and the second pair of communications devices communicate over the communications channel during a period of time concurrently.