Description
R00, or Release 2000, is not a feature-specific term but a version identifier for the entire suite of 3GPP specifications that were stabilized and frozen in early 2000. This release package is documented in the 3GPP vocabulary specification, TS 21.905. The date "2000-01-18" is the formal freeze date for this release's specifications, meaning no new functional changes were accepted after this point, allowing vendors and operators to begin consistent implementation.
Architecturally, R00 encompassed the foundational specifications for the Universal Mobile Telecommunications System (UMTS). This included the complete definition of the UMTS Terrestrial Radio Access Network (UTRAN) based on Wideband Code Division Multiple Access (WCDMA) for the air interface. The Core Network (CN) specifications detailed an evolution from the GSM/GPRS core, introducing the Iu interface between UTRAN and the CN and laying the groundwork for the IP-based Multimedia Subsystem (IMS), which was more fully developed in later releases.
How it worked was by providing a stable reference for all network elements: the User Equipment (UE), Node B (base station), Radio Network Controller (RNC), and core network nodes like the MSC, SGSN, and GGSN. The specifications defined new protocols, such as the Radio Resource Control (RRC) protocol for UTRAN, and detailed procedures for call setup, handover, packet data session management, and mobility. Its role was to be the definitive technical blueprint that enabled the first wave of commercial 3G network deployments and device development, ensuring interoperability between different manufacturers' equipment.
Purpose & Motivation
R00 existed to formalize and consolidate the first complete set of 3G standards under the 3GPP umbrella, transitioning from the research and proposal phase to a stable implementation baseline. Prior to R00, 3G specifications were in flux with multiple competing technologies and proposals. This created uncertainty for manufacturers and operators investing billions in new infrastructure.
The problem it solved was providing a concrete, agreed-upon technical foundation for UMTS. By freezing the specifications on a specific date, it allowed the global industry to align their development roadmaps. This was crucial for achieving the economies of scale needed to make 3G technology viable. It addressed the limitations of the 2G GSM and 2.5G GPRS systems by standardizing a new radio interface (WCDMA) capable of significantly higher data rates and spectral efficiency, enabling true mobile broadband services like video calling and high-speed internet access.
Historically, R00 was a critical response to the ITU's IMT-2000 vision for 3G. It represented the culmination of years of collaborative work between regional standards bodies (ETSI, ARIB, TTA, etc.) within 3GPP. The release was motivated by the urgent commercial need to launch 3G services and the regulatory pressure from spectrum auctions that had already taken place in many countries. R00 gave license holders the technical certainty required to begin network rollout.
Key Features
- Frozen specification set dated 2000-01-18
- Complete UTRAN architecture with WCDMA air interface
- Definition of the Iu interface between UTRAN and Core Network
- Enhanced Core Network evolution from GSM/GPRS
- Foundational work on IP Multimedia Subsystem (IMS) concepts
- Stable protocol specifications for RRC, NBAP, RANAP, etc.
Evolution Across Releases
R00 was introduced and defined as part of the 3GPP vocabulary in Release 4. This established it as the historical marker for the first stable UMTS release. The specifications frozen under the R00 label formed the basis from which all subsequent 3GPP releases (Rel-4, Rel-5, etc.) evolved, adding new features and capabilities.
Defining Specifications
| Specification | Title |
|---|---|
| TS 21.905 | 3GPP TS 21.905 |