High Speed Dedicated Network

Description

High Speed Dedicated Network (HSDN) is a deployment concept within the 5G New Radio (NR) framework, referring to dedicated networks built to deliver high-speed, reliable, and low-latency connectivity for specific enterprise or vertical industry applications. The architecture involves a dedicated radio access network (RAN) and often a dedicated core network (e.g., 5GC), operating either as a fully standalone non-public network (NPN) or as a virtual slice within a public network. Key components include gNBs (5G base stations) deployed on-premises or in a dedicated area, User Equipment (UE) tailored for the use case, and a core network that can be locally hosted. The RAN operates in licensed, unlicensed, or shared spectrum (like CBRS), with configurations optimized for coverage, capacity, and interference isolation.

HSDN works by allocating dedicated network resources exclusively for the use of a specific organization or service. The gNBs are configured with parameters prioritizing high throughput (e.g., wide bandwidth carriers, advanced MIMO) and ultra-reliable low-latency communication (URLLC) features like shortened transmission time intervals (TTI) and redundant transmission paths. UEs access the network using standard 5G NR procedures, but access control is restricted to authorized users, often using closed access group (CAG) or network identifier (NID) mechanisms defined for non-public networks. The core network, if dedicated, hosts application functions (AF) and user plane functions (UPF) locally to minimize latency and keep sensitive data on-site.

Its role is to provide a tailored connectivity solution that public networks cannot guarantee due to shared resource contention. It is documented in RAN specifications (e.g., TS 38.300, TS 36.304) covering UE requirements and procedures in such environments. HSDN supports critical communications for factories (Industry 4.0), smart grids, ports, and campuses, where performance, security, and control are paramount. It coexists with public network deployments but is logically or physically separated to meet stringent service level agreements (SLAs).

Purpose & Motivation

HSDN was introduced to meet the demanding connectivity requirements of vertical industries and enterprises that cannot be satisfied by conventional public mobile broadband networks. These industries, such as manufacturing, energy, and logistics, needed networks with guaranteed high speed, ultra-low latency, high reliability, and strong data privacy. Public networks, designed for broad consumer coverage and shared capacity, often lack the deterministic performance and control required for industrial automation, remote control, and sensitive operations.

The creation of HSDN in Release 15 was motivated by the 5G design principles of supporting enhanced Mobile Broadband (eMBB), URLLC, and massive Machine-Type Communications (mMTC). It addresses the limitations of previous enterprise solutions like Wi-Fi (limited mobility, interference) or early 4G private networks (limited performance customization). HSDN leverages 5G NR's technical advancements—such as flexible numerology, network slicing, and edge computing—to create dedicated networks that are as capable and manageable as traditional wired industrial networks but with wireless flexibility. It enables digital transformation in sectors where connectivity is a critical operational tool.