5G Fixed Mobile Convergence User Plane Encapsulation
draft-allan-5g-fmc-encapsulation-00

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Internet Draft                                 Dave Allan, Ericsson ed.          
Intended status: Informational               Donald Eastlake, Futurewei         
Expires: January 2020                            David Woolley, Telstra 
                                                              July 2019 
             
         5G Fixed Mobile Convergence User Plane Encapsulation 
                  draft-allan-5g-fmc-encapsulation-00 
 
Abstract 
   As part of providing wireline access to the 5G core, deployed 
   wireline networks carry user data between 5G residential gateways 
   and the 5G Access Gateway Function (AGF). The encapsulation used 
   needs to meet a variety of requirements including being able to 
   multiplex the traffic of multiple PDU sessions within a VLAN 
   delineated access circuit, to permit legacy equipment in the data 
   path to snoop certain packet fields, to carry 5G QoS information 
   associated with the data, and to be efficiently encoded. This memo 
   specifies an encapsulation that meets these requirements. 
    
Status of this Memo 

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Allan et al.,            Expires January 2020                  [Page 1] 
 

Internet-Draft     draft-allan-5g-fmc-encapsulation           July 2019 
 

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Table of Contents 

   1. Introduction...................................................2 
   1.1. Requirements Language........................................3 
   1.2. Acronyms.....................................................3 
   2. Data Encapsulation Format......................................4 
   3. Acknowledgements...............................................5 
   4. Security Considerations........................................5 
   5. IANA Considerations............................................5 
   6. References.....................................................6 
   6.1. Normative References.........................................6 
   6.2. Informative References.......................................6 
   7. Authors' Addresses.............................................7 
    

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 an F-AGF in [5]) across deployed TR-101[6] 
   and TR-178[7] access networks.  
    
   The transport encapsulation used needs to meet a variety of 
   requirements including the following: 
    
   -  The ability to multiplex multiple logical connections (PDU 
     sessions) within a VLAN identified p2p logical circuit between a 
     5G-RG and an F-AGF. 
    
   - To allow unmodified legacy equipment in the datapath to identify 
      the encapsulation and snoop specific fields in the payload. Some 
      access nodes in the data path between the 5G-RG and the F-AGF 
      (Such as DSLAMs and OLTs) currently snoop into packets identified 
      by specific ethertypes to identify protocols such as PPPoE, IP, 
      ARP and IGMP. This may be for the purpose of enhanced QoS, 
      policing of identifiers and other applications. Some deployments 
      are depended upon this snooping. Such devices are currently able 
      to do so for PPPoE or IPoE packet encodings but would be unable 
      to do so if a new encapsulation, or an existing encapsulation 
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