Carrier Wi-Fi Calling Deployment Considerations
draft-pularikkal-opsawg-wifi-calling-02

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Operations and Management Area Working Group               B. Pularikkal
Internet-Draft                                             Cisco Systems
Intended status: Informational                                  T. Pauly
Expires: August 28, 2017                                      Apple Inc.
                                                              M. Grayson
                                                           S. Gundavelli
                                                           Cisco Systems
                                                               S. Touati
                                                                Ericsson
                                                       February 24, 2017

            Carrier Wi-Fi Calling Deployment Considerations
                draft-pularikkal-opsawg-wifi-calling-02

Abstract

   Carrier Wi-Fi Calling is a solution that allows mobile operators to
   seamlessly offload mobile voice signaling and bearer traffic onto Wi-
   Fi access networks, which may or may not be managed by the mobile
   operators.  Mobile data offload onto Wi-Fi access networks has
   already become very common, as Wi-Fi access has become more
   ubiquitous.  However, the offload of mobile voice traffic onto Wi-Fi
   networks has become prevalent only in recent years.  This was
   primarily driven by the native Wi-Fi Calling client support
   introduced by device vendors.  The objective of this document is to
   provide a high level deployment reference to Mobile Operators and Wi-
   Fi Operators on Carrier Wi-Fi Calling.

Status of This Memo

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   This Internet-Draft will expire on August 28, 2017.

Pularikkal, et al.       Expires August 28, 2017                [Page 1]
Internet-DraftCarrier Wi-Fi Calling Deployment ConsideratioFebruary 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Architecture Overview . . . . . . . . . . . . . . . . . . . .   6
   4.  Wi-Fi Calling Deployment Considerations . . . . . . . . . . .   8
     4.1.  Wi-Fi to Packet Core Integration  . . . . . . . . . . . .   8
       4.1.1.  Untrusted Model . . . . . . . . . . . . . . . . . . .   8
         4.1.1.1.  IPSec Tunnel Negotation . . . . . . . . . . . . .   9
       4.1.2.  Hybrid Model  . . . . . . . . . . . . . . . . . . . .  10
       4.1.3.  Trusted Model . . . . . . . . . . . . . . . . . . . .  11
       4.1.4.  Model Selection Criteria  . . . . . . . . . . . . . .  13
   5.  Subscriber Onboarding into Wi-Fi Access Network . . . . . . .  14
     5.1.  Authentication and Identity Management  . . . . . . . . .  14
     5.2.  Hotspot 2.0 for Seamless Onboarding . . . . . . . . . . .  15
       5.2.1.  Hotspot 2.0 Inter-Operator Roaming for Wi-Fi Calling   17
   6.  Wi-Fi calling deployment in restrictive networks  . . . . . .  17
   7.  RF Network Performance Optimization . . . . . . . . . . . . .  18
     7.1.  Radio Resource Management . . . . . . . . . . . . . . . .  18
     7.2.  Wi-Fi Roaming Optimization  . . . . . . . . . . . . . . .  19
       7.2.1.  Fast BSS Transition . . . . . . . . . . . . . . . . .  19
       7.2.2.  802.11k based Neighbor Reports  . . . . . . . . . . .  19
       7.2.3.  802.11v based Assisted Roaming and Load Balancing . .  20
   8.  QoS Deployment Considerations for Wi-Fi Calling . . . . . . .  20
     8.1.  Wi-Fi Access Network QoS  . . . . . . . . . . . . . . . .  20
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