Cooperative TDD Pre-Alert Signaling for Echo-Free Ethernet PHY Links
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Solution Overview
Problem
Existing bidirectional communication systems face challenges in efficiently managing concurrent data transmission over shared communication links, leading to complex designs and the need for echo cancellation circuitry, without a clear master device for time-division scheduling.
Innovation Solution
Implementing a cooperative Time-Division Duplexing (TDD) scheme using pre-alert signaling, where PHY devices exchange pre-alert signals to enforce unidirectional data transmission, allowing flexible adaptation to bandwidth needs and eliminating the need for echo cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional bidirectional communication schemes are used over shared links, then data transmission can occur in both directions, but concurrent transmissions cause interference requiring complex echo cancellation circuitry
Solution Approach 1:
The patent applies preliminary action by having each PHY device transmit a pre-alert signal before actual data transmission. This pre-alert mechanism reserves the communication channel in advance, allowing the receiving device to prepare for unidirectional reception and eliminating the need for complex echo cancellation circuitry while maintaining bidirectional communication capability.
2Device complexity
If Time-Division Duplexing is implemented without pre-alert signaling, then unidirectional transmission can be enforced, but the system lacks flexibility in adapting to varying bandwidth needs
Solution Approach 1:
The patent implements dynamics by allowing PHY devices to flexibly adjust transmission timing based on actual bandwidth needs. The pre-alert signaling mechanism enables dynamic adaptation where devices can transmit at different rates and durations without rigid duty cycles, while still enforcing unidirectional transmission to simplify the multiplexing scheme.
3Ease of operation
If a master device is designated for time-division scheduling, then transmission coordination is simplified, but the system loses flexibility and adaptability
Solution Approach 1:
The patent applies self-service by enabling each PHY device to autonomously manage its own transmission timing through pre-alert signaling. Instead of relying on a master device for centralized scheduling, each device independently sends pre-alerts to reserve the channel, achieving both simplified coordination and flexible adaptability to varying bandwidth requirements.
Data Source
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AI summary
A physical layer (PHY) device, for use in an Ethernet network, includes a cable interface, a transmitter, a receiver and a processor. The cable interface connects to an Ethernet link for communicating with a peer PHY device. The transmitter transmits outbound signals that carry outbound data to the peer PHY device over the Ethernet link. The receiver receives inbound signals that carry inbound data from the peer PHY device over the Ethernet link. The processor (i) controls the transmitter to transmit, to the peer PHY device, an outbound pre-alert signal indicating that the PHY device is about to start transmitting the outbound signals, and (ii) in response to receiving, via the receiver, an inbound pre-alert signal from the peer PHY device during a period in which the peer PHY device is abstaining from transmitting the inbound signals, controls the transmitter to abstain from transmitting the outbound signals.