Type: UIC working group · ID: G05
The UIC working group for the Functional Interface Specification (FIS) addresses communication procedures and their consistency within the FRMCS system. UIC: FRMCS – organisation and document directory
Role in the FRMCS Context
The FIS-7970 describes end-to-end transactions for implementing functional requirements using 3GPP Mission Critical services. It sets out which service primitives are used and how communication procedures arise from them. Its focus is on the service layer. UIC: FRMCS FIS FIS-7970, version 2.1.0
This makes it particularly useful for developers and integrators when coordinating multiple components. A practical reading order is: define the desired use case, identify the corresponding procedure, and then compare the implementations involved against that procedure.
Significance and Binding Nature
The FIS is to be used together with the FRS, SRS, FFFIS and TOBA FRS. The reviewed edition explicitly excludes potential requirements on the IMS/SIP core service layer; it is therefore not a complete specification of all network layers. UIC: FRMCS FIS FIS-7970, version 2.1.0
Working Groups and Cooperation
For context, the functional requirements come from the FWG, the system architecture from the ATWG, and the application interfaces from the FFFIS. These document relationships are described within the FIS. UIC: FRMCS FIS FIS-7970, version 2.1.0
Practical Guidance
Recommendation for integration testing: record the selected procedure, involved components and expected result in the same test description. Link deviations to the specific FIS clause.