Intelligent Role Selection for Dual-Role USB Devices
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Solution Overview
Problem
In cases where two interconnected devices support both roles (dual-role devices), the assignment of roles is not deterministic, leading to potential limited or lost functionality, especially with symmetric connectors and cables like USB Type C, where incorrect role assignment can occur.
Innovation Solution
Implementing a mechanism that dynamically assigns roles to dual-role devices based on contextual information, using role managers to determine and switch roles intelligently and deterministically, considering capabilities, operational states, historical usage models, user preferences, and role requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If symmetric connectors and cables (e.g., USB Type C) are used to connect dual-role devices, then ease of operation and device versatility are improved, but role assignment becomes non-deterministic leading to potential functionality loss
Solution Approach 1:
The patent introduces asymmetric role assignment mechanisms within symmetric physical connectors. The system uses capability exchange protocols and role negotiation algorithms that create functional asymmetry between devices connected via symmetric USB Type C connectors, allowing deterministic role assignment despite physical symmetry.
Solution Approach 2:
The patent implements dynamic role assignment where device roles are not fixed but determined at connection time based on capability exchange and negotiation. The system can dynamically switch roles during operation based on operational context, power state, and application requirements, ensuring correct functionality regardless of physical connector orientation.
2Adaptability or versatility
If dual-role devices support both host and function roles, then device versatility is improved, but role assignment complexity increases making deterministic assignment difficult
Solution Approach 1:
The patent implements feedback mechanisms where devices exchange capability information, power state data, and role preference signals. The system uses this feedback to determine optimal role assignments, with continuous monitoring allowing role adjustments based on changing operational conditions, thereby managing complexity through intelligent control loops.
Solution Approach 2:
The patent changes multiple parameters simultaneously including power state, capability flags, role preference values, and operational mode to determine role assignment. By considering multiple varying parameters rather than a single fixed rule, the system achieves deterministic assignment while supporting dual-role versatility.
3Reliability
If role assignment is made deterministic through capability exchange and negotiation, then role assignment correctness is improved, but initialization time and communication overhead increase
Solution Approach 1:
The patent performs preliminary capability exchange and role negotiation during connection initialization before full data transfer begins. Devices exchange capability sets, power delivery capabilities, and role preferences in advance, allowing deterministic role assignment to be established quickly without delaying subsequent operations.
Data Source
AI summary
Embodiments described herein are directed to mechanisms that enable roles (e.g., host vs. function, power provider vs. power consumer, master vs. slave, server vs. client, source vs. sink, upstream vs. downstream) to be dynamically assigned between two interconnected dual-role devices in an intelligent and deterministic manner based on the available context on each device.