Customer Premises Network

Description

The Customer Premises Network (CPN) is a private network infrastructure deployed at a customer's physical location that interfaces with the 3GPP mobile network. It serves as the local connectivity domain for enterprise, industrial, or residential users, providing network services and connecting various devices within the premises. The CPN architecture typically includes local area networking equipment, routers, switches, access points, and potentially specialized industrial controllers or IoT gateways that manage communication between on-premises devices and the wider 3GPP network.

In the 3GPP architecture, the CPN connects to the mobile network through standardized interfaces, most commonly via the User Plane Function (UPF) in the 5G Core network. This connection enables the CPN to leverage mobile network services such as authentication, policy control, and quality of service management while maintaining local autonomy for premises-specific applications. The CPN may implement various access technologies including Wi-Fi, Ethernet, Bluetooth, or specialized industrial protocols, with the 3GPP network serving as the backhaul or interconnect to other networks and cloud services.

The CPN plays a crucial role in enterprise and industrial scenarios by providing localized processing, low-latency communication, and data sovereignty while maintaining integration with mobile network services. It enables use cases such as factory automation, smart buildings, campus networks, and remote offices by combining the flexibility of private networking with the reliability and security features of 3GPP networks. The CPN architecture supports network slicing, allowing different service requirements to be met through dedicated logical networks that extend from the mobile core to the customer premises.

Key components of a CPN in the 3GPP context include the Customer Premises Equipment (CPE) that provides the gateway function between the mobile network and local devices, local authentication and policy enforcement points, and potentially edge computing resources. The CPN management system integrates with 3GPP network management systems for coordinated operation, monitoring, and troubleshooting. Security mechanisms in the CPN include local firewalls, intrusion detection systems, and integration with 3GPP authentication and encryption protocols to ensure end-to-end security from devices to applications.

Purpose & Motivation

The CPN concept was introduced in 3GPP to address the growing need for enterprise and industrial applications that require both the capabilities of mobile networks and the control of private networks. As 5G networks expanded beyond consumer mobile broadband to support vertical industries, there emerged a requirement for networks that could be deployed at customer sites while maintaining seamless integration with the mobile operator's infrastructure. This addresses limitations of previous approaches where enterprise networks operated completely independently from mobile networks, requiring complex integration and missing out on mobile-specific features.

Previous enterprise networking solutions often relied on separate infrastructure for local connectivity and wide-area connectivity, creating management complexity and suboptimal performance for mobile-aware applications. The CPN concept enables a unified approach where the customer premises network becomes an extension of the mobile network, allowing for consistent policy enforcement, security, and service delivery across both domains. This is particularly important for Industry 4.0 applications, smart campuses, and distributed enterprises that require both local processing capabilities and reliable connectivity to central resources.

The introduction of CPN in Release 18 reflects 3GPP's evolution toward supporting diverse deployment scenarios and vertical industry requirements. It enables mobile operators to offer managed enterprise networking services that combine the best aspects of cellular and local area networking, creating new business models and service opportunities. By standardizing the interface between CPNs and 3GPP networks, it ensures interoperability between equipment from different vendors and enables scalable deployment of enterprise networking solutions.