5G Wireless Wireline Convergence User Plane Encapsulation (5WE)
draft-allan-5g-fmc-encapsulation-08

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Internet Draft                                 Dave Allan, Ericsson ed.          
Intended status: Informational               Donald Eastlake, Futurewei         
Expires: August 2021                             David Woolley, Telstra 
                                                          February 2021 
             
 
    5G Wireless Wireline Convergence User Plane Encapsulation (5WE) 
                  draft-allan-5g-fmc-encapsulation-08 
 
 
Abstract 
 
   As part of providing wireline access to the 5G Core (5GC), deployed  
   wireline networks carry user data between 5G residential gateways  
   and the 5G Access Gateway Function (AGF). The encapsulation method  
   specified in this document supports the multiplexing of traffic for 
   multiple PDU sessions within a VLAN delineated access circuit, 
   permits legacy equipment in the data path to inspect certain packet 
   fields, carries 5G QoS information associated with the packet data, 
   and provides efficient encoding. It achieves this by specific points 
   of similarity with the RFC 2516 PPPoE data packet encapsulation. 
    
Status of this Memo 
    
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Copyright and License Notice 
    
   Copyright (c) 2021 IETF Trust and the persons identified as the 
   document authors.  All rights reserved. 
    

 
Allan et al.,            Expires August 2021                   [Page 1] 
 

Internet-Draft     draft-allan-5g-fmc-encapsulation       February 2021 
 

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Table of Contents 
    
   1. Introduction...................................................2 
   1.1. Requirements Language........................................4 
   1.2. Acronyms.....................................................4 
   2. Data Encapsulation Format......................................5 
   3. Acknowledgements...............................................6 
   4. Security Considerations........................................6 
   5. IANA Considerations............................................7 
   6. References.....................................................7 
   6.1. Normative References.........................................7 
   6.2. Informative References.......................................8 
   7. Authors' Addresses.............................................8 
    
1. Introduction 
    
   Converged 5G ("fifth generation") wireline networks carry user data  
   between 5G residential gateways (5G-RG) and the 5G Access Gateway 
   Function (identified as a Wireline-AGF (W-AGF) by 3GPP in [TS23316]) 
   across deployed access networks based on Broadband Forum [TR101] and 
   [TR178]. This form of wireline access is considered to be trusted 
   non-3GPP access by the 5G system. 
    
   The transport encapsulation used needs to meet a variety of 
   requirements including the following: 
    
   -  The ability to multiplex multiple logical connections (Protocol 
     Data Unit (PDU) Sessions as defined by 3GPP) within a VLAN 
     identified point to point logical circuit between a 5G-RG and a W-
     AGF. 
    
   - To allow unmodified legacy equipment in the data path to identify 
      the encapsulation and inspect specific fields in the payload. 
      Some access nodes in the data path between the 5G-RG and the W-
      AGF (Such as digital subscriber loop access multiplexers (DSLAMs) 
      and optical line terminations (OLTs)) currently inspect packets 
      identified by specific Ethertypes to identify protocols such as