Mobile ad hoc networking and the IETF

Joseph P. Macker, M. Scott Corson
1998 ACM SIGMOBILE Mobile Computing and Communications Review  
Proceedings of the Minneapolis Manet WG Meeting The manet WG met in two sessions. The presentation and discussion topics covered a number of important mobile routing areas including: modeling and simulation, protocol performance results, implementation progress, interrouter authentication for manet, methods for query optimization in ondemand protocols, discussions on multicast and Quality of Service (QoS) approaches for manet, and a new draft routing proposal. The group continues to make
more » ... nues to make progress towards using a common set of ns simulation models for cross protocol comparison, and non-author WG participants (participants not authoring protocol drafts) are making use of these models as well to conduct simulations of manet protocols in specific scenarios of interest to them. Implementations of several manet protocol proposals now exist in various stages of maturity and here is an overview of some known status. A networked, spread spectrum radio system is commercially available from Nova Engineering, Cincinnati, OH which contains an implementation of the Temporally-Ordered Routing Algorithm (TORA) [2] running atop the Internet MANET Encapsulation Protocol (IMEP) [3] (see http://www.novaengr.com/stards57kvm.html). Enhanced Linux 2.1.95-based versions of IMEP and TORA are running at the University of Maryland and will be made available shortly. The Carnegie Mellon University (CMU) Monarch project has a "pre-alpha" level release of the Dynamic Source Routing (DSR) protocol [4] for FreeBSD 2.2.7 available (see http://www.monarch.cs.cmu.edu/dsr-impl.html). Laboratory versions of the Core Extraction Distributed Ad hoc Routing (CEDAR) algorithm [5], Optimized Link State Routing (OLSR) algorithm [6] and the Associativity-Based Routing (ABR) protocol [7] are also reported. The meeting began with the standard agenda bashing session, which was then followed by a presentation on a set of wireless and mobility enhancements being made to the ns simulator (see http://www-mash.CS.Berkeley.EDU/ns/ ) as a result of the some of the manet WG related activities and input. This was followed by presentation from Ericsson of simulation results comparing the DSR and the Ad hoc On-demand Distance Vector (AODV) routing algorithms [8] operating in "power conserving" modes for various scenaria. A presentation from CMU followed describing their recent experiences in designing, setting up and using a manet testbed along the Monongahela River in Pittsburgh, including manet nodes operating in mobile vehicles (i.e.,cars). This was followed by an update to the MANET Authentication Architecture [9] draft-a draft which may be evolving towards a general lightweight authen-tication specification for mobile architectures. Two query optimization techniques were then presented which are applicable to a set of on-demand routing protocols. This was followed by a presentation on a multicast extension to CEDAR, and by a presentation on estimating the appropriate balance between reactive and proactive traffic in MANETs. The usefulness of flooding for delivering multicast traffic in MANETs was then discussed. This was followed by a presentation of the ABR protocol. The meeting concluded with a discussion on QoS issues in manets and the extent to which QoS should be considered by the WG. In conclusion, progress was evidenced in the continuing development of implementations, ongoing comparative performance analysis of proposed protocols and the recent incorporation of common simulation extensions for manet into the base ns simulator release. New work was added into the group, including a new protocol draft and approaches, and continuing work on security and multicast for manet. Work remains in defining and reaching consensus on specific manet evaluation scenarios (e.g., mobility models, traffic models) so that we may begin the process of scoping down the set of proposed algorithms. The following sections give more details regarding various presentations. NS-2 Wireless and Mobility Extensions Joe Macker from the U.S. Naval Research Laboratory presented a set of slides provided by the UC-Berkeley/VINT ns team describing recent extentions to the presently available ns 2.1b5 release that include wireless and mobile routing capabilities. The capabilities include code modules contributed by CMU, Sun Microsystems and UC-Berkeley. Modifications include 802.11 multiple access models, and an implementation of DSR and DSDV from CMU's initial August 1998 release, channel and radio models incorporating signal attenuation, collision and capture based on a 2-ray ground reflection model. A set of validation test suites for these added features are also included. Future work on these models is desired in the areas of link and physical layer models ("Bluetooth" is sorely needed), improved scalability, additional routing protocols, and visualization. Ericsson Simulation Work Tony Larsson from Ericsson presented an overview of work comparing the performance of DSR and AODV for usage with Bluetooth-enabled wireless nodes. As Bluetooth-equipped devices will generally be battery powered, it was pointed out that energy conservation is a primary system issue. Thus, the two
doi:10.1145/584007.584015 fatcat:5y5a7unuhfdbnh5frawuiy7a54