Access Point Full-Duplex FDDF Communications via OFDMA
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Solution Overview
Problem
Current communication systems, particularly those based on the 802.11 standard, face challenges in achieving full-duplex communications due to interference between signals transmitted on commonly used frequencies, limiting network efficiency and throughput.
Innovation Solution
Implementing a system with an access point that uses different frequency bands for downlink and uplink channels, enabling full-duplex different-frequency (FDDF) communications by aligning the termination points of data packets and employing orthogonal frequency division multiple access (OFDMA) to manage simultaneous transmit and receive operations, while using filter stages to suppress transmitter leakage and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communications are implemented on commonly used frequencies, then data throughput is doubled, but signal interference increases
Solution Approach 1:
The available frequency spectrum is segmented into multiple sub-channels through OFDMA (Orthogonal Frequency Division Multiple Access). Each sub-channel operates at a different frequency, allowing simultaneous transmissions without interference. This segmentation enables multiple stations to communicate full-duplex by assigning them to different frequency segments.
Solution Approach 2:
The patent transitions from time-division multiplexing (single dimension) to frequency-division multiplexing (adding a frequency dimension). By utilizing the frequency dimension through OFDMA, the system allows simultaneous transmit and receive operations on the same time slot but different frequencies, achieving full-duplex communication.
2Productivity
If simultaneous transmission and reception occur on the same frequency, then network efficiency increases, but collision risks increase
Solution Approach 1:
The network traffic is segmented into different frequency resources through OFDMA. Each transmission is assigned to a specific sub-channel, eliminating collisions by spatially separating transmissions in the frequency domain. This allows simultaneous operations without interference between different data streams.
3Object-affected harmful factors
If different frequency bands are used for downlink and uplink, then interference is reduced, but frequency coordination complexity increases
Solution Approach 1:
The system dynamically allocates frequency resources through a centralized controller that manages OFDMA sub-channel assignments. The controller adaptively assigns different frequency sub-channels to different stations based on current network conditions, allowing flexible frequency coordination without fixed downlink/uplink band assignments. This dynamic approach reduces interference while managing complexity through intelligent resource allocation.
Data Source
AI summary
A method for controlling communication of information includes selecting a group of stations within range of an access point, transmitting a first signal from the access point to a first station in the group, and receiving at the access point a second signal from a second station in the group. The first signal is transmitted to the first station through a downlink channel. The second signal is received from the second station through an uplink channel. Transmission of the first signal takes place during a first period and reception of the second signal takes place during a second period overlapping the first period, in order to perform full-duplex different-frequency communications based on an 802.11 standard between the access point and the first station and the second station.