Peer I/O Protocol for Half-Duplex Smart Card Network Peering
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Solution Overview
Problem
Resource-constrained devices, such as smart cards and SIM modules, face challenges in performing full-duplex peer-to-peer communications due to their limited computational power and half-duplex serial command/response communication protocols, which restricts their ability to interact effectively with networks and conserves power, especially in portable devices where battery life is a concern.
Innovation Solution
The implementation of the Peer I/O protocol allows resource-constrained devices to communicate over a half-duplex serial command/response link while appearing as full-fledged network nodes, enabling asynchronous full-duplex peer-to-peer communications and conserving power by using a finite state machine to manage data transmission and polling intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If resource-constrained devices use half-duplex serial command/response communication protocols, then device complexity is reduced and ease of manufacture is improved, but communication capability deteriorates and power consumption increases
Solution Approach 1:
The patent introduces a protocol translator or gateway that mediates between the half-duplex serial command/response interface and full-duplex network protocols. This intermediary handles the complexity of protocol conversion, buffering, and retransmission, allowing resource-constrained devices to access network resources without directly implementing complex communication stacks.
Solution Approach 2:
The communication protocol is segmented into multiple layers: a simple transport layer for the half-duplex serial interface and a higher-layer application protocol that handles full-duplex semantics. This segmentation allows the device to maintain a simple hardware interface while achieving sophisticated communication capabilities through software abstraction.
2Adaptability or versatility
If resource-constrained devices implement full-duplex peer-to-peer communications, then communication capability is improved, but power consumption increases
Solution Approach 1:
The system implements periodic polling with variable intervals instead of continuous communication. The resource-constrained device can enter low-power states between polling cycles, significantly reducing average power consumption while maintaining the ability to engage in full-duplex communications when active.
Solution Approach 2:
The communication protocol includes self-service mechanisms where the device can autonomously manage its own power states, buffer data locally when the host is inactive, and trigger communications only when necessary, reducing unnecessary power consumption from host polling.
3Adaptability or versatility
If resource-constrained devices handle messages of any length, then adaptability is improved, but device complexity increases
Solution Approach 1:
Large messages are automatically segmented into smaller chunks that fit within the memory and processing constraints of the resource-constrained device. The protocol handles fragmentation and reassembly transparently, allowing the device to process messages of any length without implementing complex manual segmentation logic.
Solution Approach 2:
The system performs preliminary actions by pre-allocating buffer pools and message templates at initialization, and by pre-processing messages on the host side before transmission. This reduces the computational burden on the resource-constrained device during actual message handling.
Data Source
AI summary
A system and method for peer-to-peer communication between a slave device and network resources wherein the slave device, for example, a smart card, communicates using a protocol designed to allow the smart card to communicate over a half-duplex serial communications link while appearing to applications and network nodes as being a full-fledged network node in a manner that conserves power so as to be suitable for deployment on small portable devices.