User Generated Contents

Description

User Generated Contents (UGC) is a service concept within the 3GPP framework that encompasses the creation, upload, sharing, and consumption of multimedia content (such as video, audio, images, and text) generated by the end-users of a mobile network, rather than by professional content providers. From a network architecture perspective, UGC services place specific demands on the uplink path of the radio access network (RAN) and core network, as users generate and transmit content from their User Equipment (UE) to application servers, often located in the internet or within operator networks. This contrasts with traditional broadcast or on-demand services which are predominantly downlink-centric. The network must handle potentially sporadic, high-bandwidth uplink bursts, manage associated Quality of Service (QoS) flows for real-time streaming, and ensure efficient content delivery to other users who may request it, often leveraging caching and content distribution networks (CDNs).

Technically, UGC impacts several 3GPP system aspects. In the RAN, it influences scheduling algorithms, uplink carrier aggregation, and uplink MIMO configurations to enhance data rates and reliability. In the core network, particularly with the 5G Core (5GC), UGC traffic flows are managed through PDU Sessions with specific QoS Characteristics, such as guaranteed bit rate for uplink flows. The Session Management Function (SMF) and Policy Control Function (PCF) work together to establish and police these flows based on subscriber policies and application requirements. Furthermore, the architecture may integrate with edge computing (MEC) to reduce latency for real-time UGC processing and distribution.

The role of UGC in the network ecosystem is substantial. It is a primary driver for asymmetric network capacity planning, where uplink capabilities become increasingly critical. Standardization in specs like 22.947 helps define service requirements, including acceptable upload delays, video quality metrics, and reliability targets. This ensures network equipment vendors and mobile operators can design and deploy systems that provide a consistent and high-quality user experience for content creators and consumers alike, fostering the growth of platforms reliant on user participation.

Purpose & Motivation

The concept of User Generated Contents was formally introduced in 3GPP Release 9 to recognize and standardize the requirements for a rapidly growing class of services that were fundamentally changing mobile network usage patterns. Prior to this, 3GPP specifications were heavily focused on downlink-centric services like mobile TV, video on demand, and web browsing, where the network's primary role was efficient content delivery to the user. The explosive growth of social media platforms, video sharing sites, and later live streaming applications highlighted a significant gap: networks were not optimally designed for high-bandwidth, low-latency uplink transmission from millions of individual devices.

The creation of UGC as a defined service category aimed to solve this problem by providing a standardized set of requirements and architectural considerations. It motivated enhancements in uplink radio technology, QoS frameworks for user-to-network traffic, and network policies that could prioritize real-time uploads. By defining UGC, 3GPP enabled a coordinated evolution across RAN, core network, and service layer to support these applications efficiently, ensuring mobile networks could remain the primary platform for participatory media and real-time social interaction.

Key Features

• Focus on uplink-centric traffic patterns and capacity requirements
• Definition of QoS requirements for real-time content upload (e.g., live video)
• Considerations for service continuity and reliability during mobility
• Integration with content delivery and caching mechanisms for efficient distribution
• Support for various media types including video, audio, and images
• Alignment with policy control for managing network resources per application

Evolution Across Releases

Defining Specifications