Handoff In All IP Networks

Shinhyun Yangyangsh@hei.co.kr

Hyundai Electronics Industry Co., Ltd.

2000. 5. 18 ~ 5. 19

23G System Lab.

Overview of All IP

Characteristics of All IP Network

Move IP as close to the Air network as possible (e.g. BTS).

Make the radio access network simply another link layer

Reuse of existing IP protocols and Applications

Provide a handoff mechanism that equals to or exceeds current

cellular performance, and works for both voice and data.

Main Issues of All IP Network

Mobility Management Model

Call Control Model

Addressing and Naming, and etc.

33G System Lab.

Overview of Mobility Management

Importance of Mobility Management

One of the most important function in Mobile Communication

Pure IP protocol have never considered it.

Quality of Handoff is most important factor for Service Provider

and User, where Handoff can be supported by Mobility

Management functionality.

Hierarchical Mobility Management

Macro Mobility

Micro Mobility

43G System Lab.

Legacy 2G/3G IS-95/cdma2000

Mobile Terminal

Pure cdma2000 All-IP Mobile Terminal

Dual modeLegacy 2G/3G

IS-95/cdma2000 + cdma2000 All-IP MobileTerminal

Soft Handoff within the All-IPNetwork

Yes Yes Yes

Hard Handoff within the All-IPNetwork

Yes Yes Yes

Soft Handoff with resources ofanother cdma2000 All-IP network.

Yes Yes Yes

Soft Handoff from a cdma2000All-IP network with resources of acdma2000 legacy network.

Yes Yes Yes

Soft Handoff from a cdma2000legacy network with resources of acdma2000 All-IP network.

Yes NoYes

(The call will be supported using the ANSI-41call control model.

Hard Handoff with resources ofanother cdma2000 All-IP network.

Yes Yes Yes

Hard Handoff into a cdma2000legacy network from a cdma2000All-IP Network

Yes NoOnly when the call has been set up in the All-IPNetwork using the ANSI-41 call control model.

Hard Handoff from a cdma2000legacy network into a cdma2000All-IP Network

Yes NoYes

(The call will be supported in the All-IPNetwork using the ANSI-41 call control model.

Handoff requirements in All IP Network

From Lucent’s contribution in April (ALLIP-20000426-014_LT-Reqts_Sect_6.3.doc)

53G System Lab.

Handoff in All IP Network

General Requirements for H/O Scheme

low latency

no data loss

scalability to a large internetwork

All IP specific Issues

speedy resource reservation on IP.

reducing HA and FA overhead

soft H/O scheme

63G System Lab.

Mobile IP Provides the “macro” mobility Triangular routing and tunneling management problem

The Route Optimization provides the framework needed for fast handoff but s

till remain long latency problem : data loss might be occurred in inter-FA regis

tration process

arise HA and FA bottleneck problem

Cellular IP Solves the “micro” mobility Minimize packet losses and degradation of QoS during handoff Interwork with Mobile IP to support wide area mobility

Handoff in All IP Network (Cont.)

73G System Lab.

Hierarchical Mobility management

Hierarchical FAs : a domain FA and one or more subnet FAs

Reduces handoff latency and the load on the internetwork

Hierarchical MM with Pre-resource Allocation scheme

Resource consuming

Mobile IP with SIP

Shorter path than only Mobile IP

DHCP address allocation (similar latency with Mobile IP)

Handoff in All IP Network (Cont.)

83G System Lab.

Conclusion

To reduce handoff latency, hierarchical FA architecture can be

acceptable (e.g. regional registration)

It also can be the way to reduce HA or FA overload

To reduce data losses, Soft H/O or retransmission buffer sche

me is required

To support Soft H/O, modified wireless layer 2 protocol or enhanc

ed PPP is required

To support scalability to a large internetwork, mixture protocol

with Mobile IP can be a promising solution.