Emergency Telecommunications Service (ETS): Long Term Evolution (LTE) Access Network Security Requirements for National Security/Emergency Preparedness (NS/EP) Next Generation Network (NGN) Priority Services
|Publication Date:||1 October 2014|
Scope, Purpose, & Application
This document defines a minimum set of security requirements for the National Security and Emergency Preparedness (NS/EP) Next Generation Network Priority Services (NGN-PS) within the context of Long Term Evolution (LTE) access networks. They include requirements on the LTE functional components and interfaces and their interworking with the Circuit Switched (CS) technologies that Service Providers expect to use for voice communications1 in the initial LTE deployments.
The purpose of this document is to provide a minimum set of security requirements for the security protection of NS/EP NGN-PS in LTE Access Networks. The requirements address the protection of the LTE priority features, capabilities, and procedures. Specifically, they address the problem of securing the advance priority features and special priority handling (referred to here, collectively, simply as special handling) that NS/EP NGN-PS messages will require as they transit the LTE Access Network2 in support of priority communications. Without protection of the LTE special handling to provide priority treatment for NS/EP NGN-PS, the needs of the NS/EP community to respond effectively to crises could be hampered. The requirements focus on security protection against attacks that would compromise the integrity and availability of the LTE Access Network advance priority and special handing features. The requirements also address confidentiality protection of the Service User's private and sensitive information. This information, which might include location information or data that could reveal the user's identity, must be protected while it is in transit across the network and while it is being stored on various network entities.
The scope of this document includes (1) integrity and availability protection of the LTE advance priority features and the special handling functions and capabilities, including the scheduling mechanisms, (2) integrity and availability of NS/EP communications on the LTE Access Network segment, and (3) confidentiality protection of sensitive and private Service User data. The scope includes secure state transitions and mobility within a LTE provider domain; and security for transport of signaling and user data over LTE interfaces, the Management Plane, Supporting IP Services, and Circuit Switch Fallback (CSFB) Signaling for interworking with Universal Mobile Telecommunications System (UMTS) and Code Division Multiple Access (CDMA) Single Carrier Radio Transmission Technology (1xRTT).
The scope is restricted to security of NS/EP NGN-PS (i.e., NGN Government Emergency Telecommunications Services and Wireless Priority Services, abbreviated as GETS and WPS, respectively) as defined in [ATIS-1000057] that are specific to the LTE access network. The scope of this document is limited to priority voice services for non-roaming scenarios.
1 NGN Service Providers have elected to reuse CS technology rather than an IMS solution for their initial voice communications solution. The 3GPP specification [TS 23.272] covers circuit switch fallback (CS-FB).
2 This refers specifically to traversal over various LTE interfaces in order to securely establish bearer channels needed for priority communications.