Wireless Relay Frame Forwarding via OFDMA Frequency Multiplexing
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Solution Overview
Problem
In wireless communication systems with mixed access points connected to both wired and unwired networks, existing technologies face challenges in efficiently forwarding data across multiple relay stations, leading to increased latency due to the need for simultaneous frame transmission and reception, which can result in frame collisions and interference.
Innovation Solution
The implementation of a wireless communication device that uses frequency multiplexing to transmit data frames and trigger frames, allowing for simultaneous transmission of data and acknowledgement responses while specifying the frequency resources for each relay station, thereby reducing latency by coordinating the timing and resource usage across the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If access points use time-sequential forwarding in a mesh network, then frame collisions are avoided, but latency increases due to the time difference in forwarding
Solution Approach 1:
The patent transitions from time-sequential forwarding to frequency-division simultaneous forwarding. Access points use different frequency resources (subcarriers) to forward frames at the same time, eliminating the time delay inherent in sequential forwarding while preventing collisions through frequency separation. This dimensional shift from time to frequency domain resolves the contradiction between collision avoidance and latency reduction.
Solution Approach 2:
The patent changes the forwarding parameter from time-based sequential access to frequency-based parallel access. By allocating different frequency resources to different access points for simultaneous forwarding, the system achieves both collision-free operation and reduced latency, as frames are forwarded in parallel rather than sequentially.
2Productivity
If access points simultaneously receive and transmit frames using two frequency bands, then forwarding efficiency improves, but device complexity increases due to multi-band requirements
Solution Approach 1:
The patent enables access points to perform multiple functions (receiving and transmitting) simultaneously using a single frequency band through orthogonal frequency-division multiple access (OFDMA). Different subcarriers within the same band are used for different operations, allowing access points to act as both receivers and transmitters at the same time without requiring separate frequency bands, thus maintaining efficiency while reducing complexity.
3Area of stationary object
If relay networks use multiple relay stations for forwarding, then network coverage extends, but latency increases due to multiple forwarding hops
Solution Approach 1:
The patent enables continuous simultaneous forwarding across multiple relay stations by allocating different frequency resources to each hop. Instead of sequential forwarding where each relay waits for the previous transmission to complete, multiple relays forward frames simultaneously in parallel using frequency division, maintaining continuous useful action across the entire relay chain and reducing cumulative latency while preserving extended coverage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces latency across the entire system by preventing frame collisions and optimizing resource usage, enabling efficient data forwarding even in complex relay network configurations.
Implementation Method 1
The transmitter is configured to transmit a second frame and a third frame by frequency multiplexing
Data Source
AI summary
According to one embodiment, a wireless communication device includes: a receiver configured to receive a first frame which contains data; and a transmitter configured to transmit a second frame and a third frame by frequency multiplexing, the third frame containing the data and being addressed to a first relay station different from a sender device of the first frame. The second frame is a frame to instruct the sender device of the first frame to perform a frame transmission.