Description
Ultra High Definition (UHD) within the 3GPP context is a comprehensive service and capability framework for delivering video content with resolutions of 4K (3840x2160 pixels) and 8K (7680x4320 pixels), along with associated enhancements like high dynamic range (HDR), wide color gamut (WCG), and high frame rates (HFR). Technically, UHD service delivery over mobile networks involves a complex chain from content preparation to rendering on the User Equipment (UE). The content is encoded using advanced codecs like HEVC (H.265) or VVC (H.266) to compress the massive raw data rates (which can exceed gigabits per second for 8K) into a bitstream manageable for transmission. This encoded bitstream is then packetized and transported over the 3GPP system.
In the network architecture, UHD places immense demands on the downlink path. The Radio Access Network (RAN) must support high-order modulation (e.g., 256QAM, 1024QAM), carrier aggregation, and Massive MIMO to achieve the sustained high data rates required—often 50-100 Mbps for 4K and several hundred Mbps for 8K, depending on compression. The 5G Core network establishes PDU Sessions with QoS Flows marked with appropriate 5QI values to ensure high priority, low packet loss, and sufficient guaranteed flow bit rate for the UHD stream. The Session Management Function (SMF) and Policy Control Function (PCF) enforce policies to allocate necessary resources. Furthermore, to ensure efficiency and scalability, UHD services heavily rely on edge caching and Content Delivery Networks (CDNs) to bring popular content closer to the user, reducing backbone network load and latency.
The role of UHD is to define the end-to-end performance targets and architectural enablers for next-generation video services. Specifications such as 26.116 and 26.956 detail codec profiles, transport protocols, quality metrics (e.g., Peak Signal-to-Noise Ratio, Video Multi-Method Assessment Fusion), and device capabilities. This ensures interoperability between content providers, network operators, and device manufacturers, enabling a consistent high-quality experience. UHD is also a key driver for network slicing, where a dedicated slice with guaranteed throughput and latency can be created for premium media delivery.
Purpose & Motivation
UHD was introduced in 3GPP Release 13 in response to the global evolution of video display technology and consumer demand for higher fidelity visual experiences. Prior to UHD standardization, mobile video services were largely limited to Standard Definition (SD) and High Definition (HD - 720p/1080p). The proliferation of UHD televisions and professional content creation in 4K/8K created a mismatch: the content existed, but mobile networks lacked a standardized, efficient way to deliver it with assured quality. The existing network QoS mechanisms and radio capabilities were not designed for the order-of-magnitude increase in data rates and stringent quality requirements.
The standardization of UHD in 3GPP aimed to solve this by creating a unified set of technical requirements and solutions. It motivated the development and adoption of more efficient video codecs (HEVC), defined network performance metrics for video quality, and pushed for enhancements in radio interface throughput and reliability. By providing a clear target for network evolution, UHD ensured that 3GPP systems, especially 4G LTE-Advanced and 5G NR, could be positioned as viable platforms for delivering premium, immersive media, competing with fixed-line broadband and broadcast services.
Classification
Detected Changes Across Releases
from 3GPP Change RequestsSpecific changes extracted from the „Change history“ tables of 3GPP specifications (16 CRs across 6 releases). Complements the general historical overview above with the evidence-based evolution of this function.
Studied in Rel-13, normative work from Rel-15.
In Release 15, the primary update concerning "UHD" (Ultra High Definition) was not explicitly defined in the provided specification excerpts. The grounding context and listed Change Requests for Release 15 focus on other terminology, such as the "Addition of 5G in the definition of 3GPP system." Therefore, based solely on the supplied materials, no new technical details, procedures, or capabilities specifically for the UHD function were introduced in this release.
- Addition of 5G in the definition of 3GPP system TS 21.905CR0116
In Release 16, the specification did not introduce new technical definitions or capabilities specifically for an "Ultra High Definition" (UHD) function. The documented changes for this release, as per the provided context, were focused on foundational terminology, including additions and corrections to definitions for private communication, absolute and relative positioning, and communication service availability. Therefore, no new UHD-related service requirements or technical features were standardized in this particular vocabulary update.
In Release 17, the new UHD-related function specifically introduced support for an "8K HEVC Operation Point and CMAF Alignment." This enhancement defined the necessary technical parameters and media format alignment to enable Ultra High Definition video services, such as 8K resolution streaming, over 3GPP systems. The update ensured that the service requirements and definitions for UHD were precisely aligned with the latest industry media standards for delivery and playback.
In Release 18, the updates for the Ultra High Definition (UHD) function primarily involved terminology corrections and clarifications within the 3GPP vocabulary. This included a specific correction on the signaling for IMSC 1.1, AVC, and HEVC within the 5G Media Streaming function. These changes aimed to ensure precise and consistent use of technical terms related to media delivery and codec signaling across the specifications.
- Pirates definitions and abbreviations TS 22.261CR0535
- Adding definition of terminology for AMMT TS 22.261CR0598
- Correction on the definition of PIN and PIN Element TS 22.261CR0605
- Quality improvement - updating the definition of communication service availability TS 22.261CR530
- Correction to Reliabilty definition TS 22.261CR0557
- [5GMS3] Correction on IMSC 1.1. AVC and HEVC signaling TS 26.511CR0011
In Release 19, the UHD function was enhanced with updates for MV-HEVC (Multiview High Efficiency Video Coding) under the VOPS work item. This provided new definitions and technical specifications to support advanced multiview video services, which are a key component for delivering Ultra High Definition experiences. These updates ensure precise terminology and requirements for these capabilities within the 3GPP framework.
In Release 20, 3GPP introduced the "UHD" (Ultra High Definition) function to its service requirements, specifically enhancing the 5G LAN-type service. This update corrected the existing definition for this service to ensure technical clarity and consistency across specifications. The enhancement provided a more precise vocabulary for the service requirements documentation, aligning with the ongoing work to facilitate communications with packet data networks and applications.
- Correct the definition of 5G LAN-type service TS 22.261CR0844
Explore further
Broader topics and technologies where UHD plays a role.
Defining Specifications
3GPP specifications that define or reference UHD, with the latest known release. Sourced from the 3GPP document catalog — see methodology.
| Specification | Title | Release |
|---|---|---|
| TR 21.905 vj00 | 3GPP Technical Terms and Definitions | Rel-19 |
| TS 22.261 vk30 | 5G System Service Requirements | Rel-20 |
| TR 22.816 ve10 | 3GPP TV Service Enhancement Technical Report | Rel-14 |
| TS 22.864 vf00 | 5G Network Operation Use Cases & Requirements | Rel-15 |
| TS 26.116 vj00 | TV Video Formats for 3GPP Services | Rel-19 |
| TS 26.234 vj00 | 3GPP PSS Protocols and Codecs Specification | Rel-19 |
| TS 26.346 vj20 | MBMS User Services Media Codecs & Protocols | Rel-19 |
| TS 26.511 vj00 | 5G Media Streaming Profiles, Codecs & Formats | Rel-19 |
| TS 26.804 vj10 | 5G Media Streaming Extensions Study | Rel-19 |
| TR 26.923 vj00 | Study on IMS-based Telepresence Media Handling | Rel-19 |
| TR 26.925 vj00 | Media Traffic Characteristics for 3GPP Networks | Rel-19 |
| TR 26.949 vj00 | TV Service Profiles for 3GPP Networks | Rel-19 |
| TR 26.955 vj00 | Video Codec Analysis for 5G Services | Rel-19 |
| TR 26.956 vj01 | Beyond 2D Video Formats & Codecs Study | Rel-19 |