Valid8 Performs Successful Demo of Interworking Function Between LTE and LMR
Thursday, May 06, 2021 | Comments performed a successful live demonstration of an interworking function (IWF) between LTE mission-critical services (MCX) technology and legacy LMR public-safety communications systems using the company’s IWF emulator.

This represents a major milestone as part of Valid8’s work under the guidance of the National Institute of Standards and Technology (NIST) to create a standards-based bridge between emerging MCX technologies and existing LMR equipment. By using the functional connectivity model defined in Third Generation Partnership Project (3GPP) Technical Specification (TS) 29.379 v17.2.0, figure 5.2-3 toward a Project 25 (P25) Radio Frequency Subsystem (RFSS) acting as the home RFSS, Valid8 developed and demonstrated an IWF emulator that allows LTE MCX systems to make a group call over the standard Inter-RF Subsystem Interface (ISSI) to a P25 LMR system for public-safety communications.

Valid8 said it is the first to create a cost-effective IWF emulator to use IWF-1 and IWF-3 to make a group call from an MCX system to a P25 LMR system over ISSI (as defined in 3GPP TS 23.283 V17.2.0). This successful demonstration illustrates that connecting legacy technologies to MCX is possible, encouraging wider adoption of these new standards.

“We are excited to have helped to prove that this connection is possible for MCX solution providers,” said Winnie Carpenter, vice president of engineering at Valid8. “The LMR to MCX IWF component will enable these agencies to more easily interoperate with other agencies that use modern and advanced MCX services, such as the exchange of voice, video, text, images, locations and more. This represents a significant milestone toward an open standard for public-safety communications.”

The ISSI connection represents an initial step in Valid8’s road map/strategy to emulate and provide wraparound test capabilities for a variety of legacy system types and interfaces in the public safety and mission critical industries.

The ISSI was developed to provide standards-based interconnectivity between two ISSI-capable networks. Valid8’s IWF emulator demonstrates the effectiveness of ISSI and how completely different systems can be connected using this standard interface.

The IWF emulator builds on Valid8’s experience developing the P25 CAP ISSI CSSI conformance tester and MCX client Conformance tester. With the IWF emulator, Valid8 can deliver a cost-effective, customizable solution in the near term while the deployable IWFs continue to be developed.

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