Lower Camel Case

Description

Lower Camel Case (LCC) is a typographical convention for writing compound words or phrases where each word, except the first, begins with a capital letter, and there are no spaces or punctuation between words. Within the context of 3GPP specifications, it is formally defined and mandated for use in certain identifiers, parameter names, and data structures, particularly within management and charging-related specifications like TS 28.821 and TS 32.156. Its application ensures a standardized, machine-readable, and human-readable format for naming elements across different network functions and interfaces.

The convention is strictly applied in the definition of YANG data models, management object definitions, and protocol data units (PDUs) where a consistent naming style is critical for interoperability and automated processing. For example, a parameter representing 'maximum bit rate' would be formatted as 'maxBitRate' in LCC. This prevents ambiguity that could arise from different naming styles (like snake_case or UpperCamelCase) and facilitates easier parsing and code generation by network management systems and software development kits (SDKs).

From an architectural perspective, the use of LCC is a foundational aspect of 3GPP's data modeling strategy. It supports the principles of a unified management framework, where northbound interfaces (like those for network management) present data in a predictable, structured format. This consistency reduces integration complexity for multi-vendor environments and is essential for the automated lifecycle management of network functions, including configuration, performance monitoring, and fault management in 5G and beyond networks.

Purpose & Motivation

The primary purpose of standardizing Lower Camel Case within 3GPP is to enforce naming consistency across a vast ecosystem of technical specifications developed by different working groups. Prior to such conventions, specifications could use ad-hoc naming styles, leading to confusion, integration errors, and increased development time for equipment vendors and software developers implementing the standards. LCC provides a clear, rule-based approach for constructing names.

This convention solves the problem of syntactic heterogeneity in machine-to-machine interfaces, especially those based on modern data serialization formats like JSON and XML, which are prevalent in 3GPP's service-based architecture (SBA). By dictating a single style, it ensures that management data models and API definitions are predictable, which is crucial for the development of automated tools, code generators, and ensuring that different network functions can correctly interpret each other's data. It addresses a fundamental software engineering challenge within a standardization body.

Historically, the motivation for its formal inclusion in releases like Rel-11 was driven by the increasing software-defined nature of telecommunications networks. As 3GPP specifications began to incorporate more detailed management and orchestration data models, a consistent lexical style became a prerequisite for scalability and interoperability. It is a key enabler for the DevOps and GitOps practices applied to network management, where infrastructure is defined and managed through code that must be unambiguous and consistent.

Key Features

• Defines a consistent lexical convention for compound identifiers
• Mandates first word in lowercase and subsequent words capitalized
• Eliminates spaces and special punctuation between words
• Enhances human readability of technical parameter names
• Facilitates automated code and data model generation
• Critical for interoperability in management and charging interfaces

Evolution Across Releases

Defining Specifications