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Keysight offers the first commercial bench-top solution supporting SUPL functional test using an air-interface connection to a SUPL-enabled device
Global Positioning System (GPS) receivers are becoming increasingly common in mobile devices. The demand is not only driven by the desire for personal navigation, but also by regulator-led initiatives such as the US Federal Communications Commission (FCC) E911 requirement to report the location of callers to the 911 emergency service. Assisted GPS (A-GPS) services provide a device with approximate location information, which can significantly shorten the time for that device to obtain an accurate GPS fix. Testing of these features is mandated by the Global Certification Forum (GCF) and PCS Type Certification Review Board (PTCRB) handset certification bodies.
Overview
Location services implementations based on control plane architecture may require significant updates to the mobile network infrastructure. As the popularity of A-GPS services grows, there is potential for control-plane capacity in these systems to become exhausted.
In contrast, Secure User Plane Location (SUPL) is a technology which utilizes existing infrastructure and standards to transfer Location Services (LCS) data over a user plane bearer, such as Internet Protocol (IP). A centralized SUPL Location Platform (SLP) connects to the system, enabling networks and mobile devices to offer A-GPS capability. Detailed specifications exist today which enable the use of SUPL in GSM, UMTS, CDMA, LTE, UMB, and WiMAX™ networks.
The Keysight Technologies, Inc. 8960 Wireless Communications Test Set with appropriate Lab Applications already supports testing of A-GPS via control plane RRLP or RRC messaging. The Keysight E6965A complements this solution, facilitating A GPS/location-service testing via the user plane (IP data) by emulating a SUPL Location Platform (SLP). This makes it possible to test a SUPL Enabled Terminal (SET) on the bench.
Standards
SUPL v1.0 became an approved OMA enabler release in June of 2007. SUPL v1.0 is compatible with 3GPP Release 6 specifications and version 1.1 of the OMA Mobile Location Services (MLS) specifications. Currently approved versions of SUPL allow for a MLS Application resident on the SET to query the SLP at any time for assistance in calculating, or to provide calculation of, the SET’s own current location. Recent candidate versions of SUPL add support for more advanced forms of network and SET-initiated location requests.
The relevant standards are found in the 3rd Generation Partnership Project (3GPP) and Open Mobile Alliance (OMA) documentation.
Testing SUPL
E6965A provides the elements of the SUPL Location Platform that are required for testing SUPL-enabled terminals.
Keysight offers additional components to facilitate testing of SUPL-enabled terminals. The Keysight 8960 Wireless Communications Test Set, with appropriate Lab Application, is used as the cellular base-station emulator. A Keysight ESG Vector Signal Generator may be used as a GPS satellite simulator. The E6965A is also capable of operating with alternative GPS satellite simulators, as long as assistance data for the GPS scenarios is known and available to the E6965A using a .csv file format.
E6965A Capability
The location server emulator includes:
The location server emulator supports:
Protocol logging
The built in protocol logging capabilities provided in E6965A allow for basic logging and decoding of all User-plane Location Protocol (ULP) messages sent between the Location Server and connected devices. Any embedded positioning protocol messages (RRLP or RRC) contained within such ULP messages are also independently decoded and logged by the E6965A.
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