A New Paradigm for IPBased Cellular Networks

1
A New Paradigm for IP-Based Cellular Networks

• M.Scott Corson, Rajiv Laroia, Alan ONeill,
  Vincent Park, and George Tsirsis
• IT Professional
• Presented by Kisuk, Kweon

2
Contents

• Introduction
• Physical layer
• MAC and link layer
• Network layer
• Mobility management
• Reactive make-before-break handoff

3
Contents

• Fast break-before-make handoff
• Mobile IP extensions and future work
• Roaming and AAA
• Voice
• Multicast
• Interactive services
• Conclusions

4
Introduction

• The need for data-centric cellular
  infrastructures
• An air interface must be symmetric and support
  interactive data exchange
• Orthogonal frequency-division multiplexing called
  flash - OFDM

5
Physical layer

• The physical layer is a fast-hopped OFDM
  derivative
• Possible to transmit a single bit with no
  overhead
• OFDMs perennial peak-to-average power problem

6
MAC and link layers

• Sharing a data pipe by scheduling bandwidth
  resources on both links
• Supporting link-layer unicast, multicast, and
  broadcast on downlink on the uplink only unicast
  
• Optimized for bursty data delivery, but it can
  also carry voice and other media flows

7
Network layer

• Designed flash-OFDM to be deployable within a
  pure-IP network
• The use of autonomous RRs is important

8
Mobility management

• Supports true make-before-break (MBB)
• Based on Mobile IP enhanced with prestandard
  handoff
• Supports two additional handoff modes

9
Reactive make-before-break handoff
10
Fast break-before-make handoff

• Buffering all packets if connectivity to the
  RR(RadioRouter) is interrupted
• When reestablishing connectivity with the same
  RR, mobile device will deliver the buffered
  packets
• When reestablishing connectivity with a new RR,
  mobile device will trigger the same events as in
  the reactive MBB

11
Mobile IP extensions and future work

• Fast handoffs and handoff operation with context
  transfer
• RadioRouters already support a prestandards
  version of these technologies
• Flash-OFDM is designed with simplicity and
  IP-friendly

12
ROAMING AND AAA

• Allows roaming mobile devices billable Internet
  access in domains other than their home domains
• Supports the collection of accounting records
  based on the service level agreement

13
Voice

• Designed flash-OFDM to support interactive data
• Packet voice of flash-OFDM is higher quality than
  that of 2G or 3G
• A fast retransmission greatly eases the task of
  header compression.

14
Multicast

• The goal of multicast is to never transmit a
  multicast packet more than once
• 3G network architecture is inherently unscalable
  from a multicast perspective

15
Interactive Services

• Session Initiation Protocol (SIP) and IPv6 return
  the Internet to its peer-to-peer origins
• Current CDMA cellular technologies are
  inappropriate for these types of services
• Flash-OFDM is well suited for transmitting small
  amount of data

16
Conclusions

• Enables the Internets seamless, affordable
  extension to the wide-area mobile environment
• The pure IP-based cellular network architecture
• Straightforward, consistent, and effective
  architecture