scope:

A voluntary agreement for improving location accuracy for emergency calls was developed and signed on November 14, 2014 by the Association of Public Safety Communications Officials (APCO), National Emergency Number Association (NENA), AT&T, Sprint, T-Mobile, and Verizon Wireless. This voluntary agreement included a roadmap for technology changes that was submitted to the FCC in response to an FCC initiative (proceeding 07- 114) to provide a number of improvements to emergency location capabilities including providing a dispatchable location for emergency calls to Public Safety Answering Points (PSAPs) (http://apps.fcc.gov/ecfs/document/view?id=60000988441).

In addition to the roadmap submitted, the FCC created new requirements to address Location Accuracy. These rules are discussed in the FCC 4th Report & Order [Ref 3] and codified within the published Code of Federal Regulations (CFR) [Ref 2].

ATIS-0700028v1.1 specifies the standards needed to support the commitments defined in the roadmap described above as well as the rules as outlined within the FCC CFR.

This standard provides guidelines on the acquisition and derivation of Heightened Accuracy Location Information (HALI) related to an emergency call, as applicable to ATIS-0700028v1.1. As defined in ATIS-0700028v1.1, HALI may include one or more of a Dispatchable Location (DL), a Geodetic Location (GL), details on Source Position Methods (SPM) that were used to obtain a Geodetic Location, and Uncompensated Barometric Pressure (UBP) for a suitably capable User Equipment (UE).

NOTE: The Third Generation Partnership Project (3GPP) Location Services (LCS) architecture and its associated procedures, which include separate Gateway Mobile Location Center (GMLC), Mobility Management Entity (MME), and Evolved Serving Mobile Location Center (E-SMLC) network functions, is presented in this document. Other standards-based LCS architectures [e.g., Open Mobile Alliance (OMA) Secure User Plane Location (SUPL)] and procedures that support HALI are defined but not described. The underlying recommendations described in this document are generally applicable across alternative emergency architectures and procedures that support HALI.