name: PNF
full_form: Physical Network function
context: Figure 6.23.2.3-1: Authorization and service invocation procedure cNF authorization: 1. The cNF sends an access token request to the NRF. The request contains the NF type of the pNF and potentially slice information, but not a specific NF instance ID of the pNF. The request also contains the NF instance ID of the cNF. 2. The NRF sends the access token response to the cNF including the signed token. Service request: 3. The cNF uses delegated discovery and selection and sends a service request for the specific service to the SeCoP. The service request includes the access token for the pNF providing the service as received in step 2. 4. If no cached data is available the SeCoP discovers the pNF. 5. The SeCoP selects a pNF instance, performs the API root modifications and forwards the received request to the selected pNF instance. The request contains the token as received in 3. and valid for the cNF. 6. To authorize the access the pNF validates the token by verifying the signature and
description: A Physical Network Function (PNF) is a type of network function that provides specific services within the network infrastructure. It is responsible for handling service requests, validating access tokens, and interacting with other network functions to ensure proper authorization and service invocation.
explanation: The text explicitly states that PNF is a 'type of network function' and describes its role in handling service requests, validating access tokens, and interacting with other network functions for authorization and service invocation. These characteristics align with the definition of a Network Function.
section_title: 6.23.2.3	Authorization and service invocation procedure
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