Full-Duplex Wireless Communication via Frequency-Separated Data and ACK Routing
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Solution Overview
Problem
Current wireless data networking protocols, such as IEEE 802.11 WLAN, operate in half-duplex mode, which reduces efficiency in transporting bi-directional traffic over wireless networks, leading to decreased downlink traffic utilization due to high MAC overhead and inefficient ACK packet handling.
Innovation Solution
Implementing a system and method for full-duplex wireless data communication by using separate transmitters at different frequencies for data and acknowledgement messages, where TCP DATA packets are transmitted at 5 GHz and TCP ACK packets are transmitted at 2.4 GHz, allowing concurrent transmission and direct acknowledgement message routing from the last repeater to the access point, bypassing intermediate repeaters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If half-duplex mode is used for wireless communication, then compatibility with existing hardware and protocols is maintained, but network throughput and efficiency deteriorate due to sequential transmission and high MAC overhead
Solution Approach 1:
The patent segments the wireless communication into two independent full-duplex channels: one for downlink traffic (AP to client) and one for uplink traffic (client to AP). Each channel operates independently with its own transmission opportunities, allowing simultaneous bidirectional communication while maintaining compatibility with existing half-duplex hardware through separate resource allocation.
Solution Approach 2:
The patent introduces a temporal dimension to resolve the half-duplex limitation by creating overlapping transmission opportunities. The AP can transmit downlink frames while the client simultaneously transmits uplink frames in separate spatial or frequency resources, effectively adding a time dimension to the communication pattern that enables full-duplex operation over half-duplex hardware.
2Loss of time
If separate transmitters at different frequencies are used for data and acknowledgement messages, then latency and jitter are reduced, but device complexity increases
Solution Approach 1:
The patent makes the wireless transceiver universal by enabling it to handle multiple functions simultaneously: transmitting data frames, receiving acknowledgement frames, transmitting management frames, and receiving data frames all through the same hardware interface. The system adapts its behavior based on the frame type and transmission direction rather than requiring separate dedicated hardware for each function.
Solution Approach 2:
The patent introduces the Access Point as an intermediary that manages the full-duplex communication coordination. The AP receives buffer status reports from clients, determines appropriate transmission opportunities, and schedules downlink frames accordingly. This intermediary coordination layer simplifies the client device complexity while enabling full-duplex operation.
3Productivity
If ACK packets are transmitted through intermediate repeaters, then network coverage is extended, but transmission efficiency deteriorates due to additional hops and overhead
Solution Approach 1:
The patent extracts the acknowledgement transmission function from the general data transmission path. ACK frames are given special handling where they can be transmitted directly from the client to the AP when possible, bypassing intermediate repeaters that would otherwise be required for data frames. This extraction of the ACK function allows for more efficient direct transmission while maintaining the extended coverage capability for data transmission through the repeater network.
Data Source
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AI summary
An apparatus for transmission of data encapsulated in a bi-directional network transmission protocol over a distributed wireless network comprises a processor configured to direct the data encapsulated in the bi-directional network transmission protocol for transmission by a first wireless transmitter at a first frequency, and direct acknowledgement messages of the bi-directional network transmission protocol generated in response to reception of the data, for transmission by a second wireless transmitter at a second frequency. The apparatus described herein provide full-duplex wireless data communication over the distributed wireless network, in comparison to other standard methods that provide half-duplex wireless data communication. The full-duplex mode provides more efficient transport of traffic over a distributed wireless network in comparison to half-duplex based wireless networking protocols.