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thakurajayL / udp_adapter

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Udp Adapter

This adapter is to allow multiple SMFs to communicate with UPF

Adapter Overview

This adapter sits between SMF and UPF (Arch: SMF <-> UDP Adapter <-> UPF).

For SMF

  • It acts as a HTTP client/server to SMF
  • It receives HTTP packets with PFCP message information from SMFs
  • It retrieves PFCP message information
  • It reassembles the corresponding PFCP message

For UPF

  • It sends the reassambled PFCP message to UPF

  • UDP Adapter Code

    • Use Same SMF codebase to create one more executable. like udp-adapter
    • create 2 executable. smf (existing), udp_adapter (new)
    • Helm chart changes to start udp adapter from smf container image

UDP Pod Data structures - Unique incremental sequence number : assign for every new request message - Keep transaction table at UDP pod: sequence number ==> trans struct

UDP-SMF Message Structure: - PFCP Encoded Message - UFP Identifier

Incoming Messages from SMF Pod: - Send PFCP Association ? How ? This has relation with config at UDP Pod. - Do we want config downloaded to UDP adapter? [No] - Send PFCP association when SMF sends first message towards UPF - UPF association modify/delete can be done later stages - UDP Pod can assign sequence number for pfcp association request message

- Request Message Received fron SMF Pod
    - If association not formed then first initiated association and then only send actual request message
    - UDP Pod can assign sequence number for every new request message.
    - Create transaction.
    - Send Request message towards UPF

- Response Message Received from UPF
    - Locate transaction based on pfcp sequence number
    - Post response message on SMF http thread
    - If association response is received then go through outstanding queued message and dispatch them towards UPF

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