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endc 5g call flow

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The 5G End-to-End Call Flow involves several steps, from the initiation of the call to its termination. Here's a technical breakdown of the 5G End-to-End Call Flow:

1. Initial Access and Registration:

  • UE (User Equipment) Attachment: The UE initiates the registration process by sending an initial attach request to the 5G Core (5GC) through the gNB (5G New Radio Node).
  • Authentication and Security: The 5G Core authenticates the UE. If authentication is successful, the 5GC provides security parameters to establish a secure connection between the UE and the network.
  • Registration: Once security is established, the UE registers with the network.

2. Establishment of PDU Session:

  • PDU Session Setup: The UE requests the establishment of a PDU (Packet Data Unit) session with specific quality of service (QoS) parameters.
  • Path Setup: The 5GC sets up the path and allocates resources in the data network for the PDU session.

3. Setting up the Data Connection:

  • Bearer Establishment: The 5GC establishes the data bearer for the UE based on the requested QoS.
  • Data Transmission: The data connection is established, allowing the UE to send and receive data packets.

4. Voice Service Initiation:

  • Voice Call Request: The UE initiates a voice call request, which triggers the voice service setup in the 5G network.
  • Session Establishment: The 5GC establishes a voice session by allocating appropriate resources and setting up necessary parameters for voice communication.

5. Voice Data Transfer:

  • Codec Selection: The 5G network selects an appropriate codec for voice encoding and decoding.
  • Voice Data Transfer: Encoded voice data is transmitted between the UE and the 5G network using the established bearer.

6. Call Termination:

  • Voice Call End Request: When the user ends the call, the UE sends a call end request to the 5G network.
  • Release of Resources: The 5G network releases the allocated resources, terminates the voice session, and closes the data connection.

Key Components Involved:

  1. User Equipment (UE): Device used by the user to initiate the call.
  2. 5G New Radio (gNB): Radio access network component responsible for radio communication with the UE.
  3. 5G Core (5GC): Core network component responsible for call setup, management, and termination.
  4. Packet Data Unit (PDU) Session: Logical connection established between the UE and the 5G network for data communication.
  5. Bearer: Dedicated data path established between the UE and the 5G network for data transfer.

Summary:

The 5G End-to-End Call Flow involves multiple steps starting from initial access and registration to voice service initiation, data transfer, and call termination. Key components such as UE, gNB, and 5GC play crucial roles in establishing and managing the call connection, ensuring seamless voice communication with high quality of service.