Browse Prior Art Database

MOBILE IP ROUTE OPTIMIZATION IN AN iDEN SYSTEM

IP.com Disclosure Number: IPCOM000008074D
Original Publication Date: 1997-Mar-01
Included in the Prior Art Database: 2002-May-16
Document File: 3 page(s) / 134K

Publishing Venue

Motorola

Related People

Rajesh Pal: AUTHOR [+2]

Abstract

The route optimization in iDEN defines the routing of datagrams between the mobile nodes in an iDEN system. The purpose of such a protocol is to optimize the datagram routing without using or generating air traffic on an iDEN system for opti- mization objectives.

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MOTOROLA Technical Developments

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MOBILE IP ROUTE OPTIMIZATION IN AN iDEN SYSTEM

by Rajesh Pal and Piy P. Peng

1 .O INTRODUCTION

  The route optimization in iDEN defines the routing of datagrams between the mobile nodes in an iDEN system. The purpose of such a protocol is to optimize the datagram routing without using or generating air traffic on an iDEN system for opti- mization objectives.

  The route optimization procedure proposed in this document requires the participation of the MD@ (Foreign Agent) only and meets the overall objective of the iDEN system of providing perfor- mance driven, efftcient data communication, with- out using the air bandwidth for optimization pur- poses. It provides the means for MDG (Foreign Agent) to cache the binding for mobile nodes and then to tunnel the datagram directly to the destina- tion if possible, bypassing the possibly lengthy route for each datagram to and from the mobile node's Home Agent.

2.0 MOBILE-IP ROUTING

  The proposed IETF) Mobile IP" draft causes dogleg routing. The dogleg routing is a phenomena where a datagram to take a longer path from foreign network to home network and back to foreign net- work even though the source and the destination mobile nodes are connected to the same foreign net- work.

  The Figure l,"Mobile IP routing:' shows the routing of datagrams from Mobile Node 1 to Mobile Node 4 in absence of routing optimization.

Mobile Nodes Mobile Nodes

Data .----+

Fig. 1 Mobile IP Routing

3.0 ROUTING OPTIMIZATION (WORK IN PROGRESS)

  The proposed IETF routing opfimizafion draft resolves the problem of dogleg routing at the cost of additional traffic. This additional traffic consumes air bandwidth in radio environment and affects the overall performance of the system.

0 Motarola, 1°C. 1997 145 March 1997

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MOTOROLA Technical Developments

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MN4

Mobile Nodes Mobile Nodes

Data .----* Binding discovery message - - + Encapsulated data c

Fig. 2 IETF Proposed Optimization Process

  The purposed implementation requires the par- ticipation of home agent, foreign agent and mobile nodes. The binding information and update mes- sages generated by the home agent destined for mobile node cause air traffic. This method requires mobile nodes to maintain the binding information in

their cache and tunnel the datagrams directly to the destination node. Since the mobile no...