Edge Caching for Media Playback Authorization

Solution Overview

Problem

Existing media playback systems face challenges in efficiently managing authorization and permissions across multiple devices and users, particularly in scenarios like house parties or hospitality settings, where many users may need concurrent access with varying levels of permissions.

Innovation Solution

The implementation of an authorization management system that uses token-to-role and role-to-permissions mappings, cached on edge data caches within playback devices, to authenticate clients and determine their permissions, thereby reducing queries to cloud services and enhancing data transmission efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If authorization queries are made to cloud services for each client authentication, then authorization accuracy is improved, but data transmission volume increases and system responsiveness decreases

Engineering Contradiction:

Improveauthorization accuracyVSAvoiddata transmission costs

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The system performs preliminary authorization queries to cloud services during initial client authentication, obtaining and caching authorization data locally in the media playback system. This preliminary action allows subsequent authorization checks to use cached data without repeated cloud queries, reducing data transmission volume while maintaining authorization accuracy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces an edge data cache as an intermediary layer between cloud services and the media playback system. This cache stores authorization data locally, acting as a mediator that reduces direct communication with cloud services while ensuring accurate authorization decisions can be made without continuous external queries.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If authorization queries are made to cloud services for each client authentication, then authorization accuracy is improved, but system responsiveness decreases

Engineering Contradiction:

Improveauthorization accuracyVSAvoidauthentication time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system performs preliminary authorization queries to cloud services during initial client authentication, obtaining and caching authorization data locally in the media playback system. This preliminary action allows subsequent authorization checks to use cached data without repeated cloud queries, reducing data transmission volume while maintaining authorization accuracy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces an edge data cache as an intermediary layer between cloud services and the media playback system. This cache stores authorization data locally, acting as a mediator that reduces direct communication with cloud services while ensuring accurate authorization decisions can be made without continuous external queries.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If multiple users with varying permissions are supported in complex access scenarios, then system versatility is improved, but authorization management complexity increases

Engineering Contradiction:

Improveaccess scenario flexibilityVSAvoidauthorization management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the authorization management system into distinct components: cloud services for initial authorization, edge data cache for local storage, and media playback system for execution. This segmentation allows complex multi-user permission scenarios to be handled by distributing authorization logic across multiple independent components, reducing overall system complexity while maintaining versatility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an edge data cache as an intermediary layer between cloud services and the media playback system. This cache stores authorization data locally, acting as a mediator that reduces direct communication with cloud services while ensuring accurate authorization decisions can be made without continuous external queries.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250184331A1Authorization management in a media playback system

Publication Date: 2025.06.05 SONOS INC

AI summary

Example techniques described herein involve authorization management in a media playback system. Within examples, a client, such as a control device, may authenticate with a playback device using a token. The playback device may resolve a role corresponding to the token using a token-to-role mapping hosted at an authentication service. After resolving the role, the playback device may resolve a permissions set corresponding to the role using a role-to-permissions mapping similarly hosted at the authentication service. Within examples, such mappings may be cached locally at the edge (e.g., on a playback device).