INTERNET-DRAFT Zygmunt J. Haas, Cornell University
Marc R. Pearlman, Cornell University
Prince Samar, Cornell University
Expires in six months on January 2003 July 2002
The Zone Routing Protocol (ZRP) for Ad Hoc Networks
<draft-ietf-manet-zone-zrp-04.txt>
Status of this Memo
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Abstract
This document describes the Zone Routing Protocol (ZRP) framework, a
hybrid routing framework suitable for a wide variety of mobile ad-hoc
networks, especially those with large network spans and diverse
mobility patterns. Each node proactively maintains routes within a
local region (referred to as the routing zone). Knowledge of the
routing zone topology is leveraged by the ZRP to improve the
efficiency of a globally reactive route query/reply mechanism. The
proactive maintenance of routing zones also helps improve the quality
of discovered routes, by making them more robust to changes in network
topology. The ZRP can be configured for a particular network by proper
selection of a single parameter, the routing zone radius.
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Contents
Status of this Memo . . . . . . . . . . . . . . . . . . . . . . i
Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . i
Applicability Statement . . . . . . . . . . . . . . . . . . . iii
A. Networking Context . . . . . . . . . . . . . . . . . iii
B. Protocol Characteristics and Mechanisms . . . . . . . iii
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . 1
2. Overview of the Zone Routing Framework . . . . . . . . . . . 2
2.1 Routing Zones and the Intrazone Routing Protocol . . . 2
2.2 Bordercast-Based Global Reactive (Interzone) Routing . 4
3. The ZRP Architecture . . . . . . . . . . . . . . . . . . . . 5
4. Other Considerations . . . . . . . . . . . . . . . . . . . . 6
4.1 Sizing the Routing Zone . . . . . . . . . . . . . . . . 6
4.2 Hierarchical Routing and the ZRP . . . . . . . . . . . 6
5. Patent Rights Statement . . . . . . . . . . . . . . . . . . . 8
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
Authors' Information . . . . . . . . . . . . . . . . . . . . . 11
MANET Contact Information . . . . . . . . . . . . . . . . . . . 11
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Applicability Statement
A. Networking Context
The hybrid Zone Routing Protocol (ZRP) framework can adapt to a wide
variety of network scenarios by adjusting the range of the nodes'
proactively maintained routing zones. Large routing zones are
preferred when demand for routes is high and/or the network consists
of many slowly moving nodes. In the extreme case of a network with
fixed topology, the ideal routing zone radius would be infinitely
large. (Consider the purely proactive routing protocols used on the
fixed Internet). On the other hand, smaller routing zones are
appropriate in situations where route demand is low and/or the
network consists of a small number of nodes that move fast relative
to one another. In the "worst case", a routing zone radius of one
hop is best, and the ZRP defaults to a traditional reactive flooding
protocol.
When the ZRP is properly configured for a particular network scenario,
it can perform at least as well as (and often better than) its purely
proactive and reactive constituent protocols. In situations where
the network behavior varies across different regions, the ZRP
performance can be fine-tuned by individual adjustment of each node's
routing zone.
The global reactive component of the ZRP uses the multicast based
"bordercast" mechanism to propagate route queries throughout the
network efficiently, rather than relying on neighbor-broadcast
flooding found in traditional reactive protocols. Consequently, the
ZRP provides the most benefit in networks where reliable neighbor
broadcasting is either inefficient or altogether impossible. In
particular, the ZRP is well suited for multi-channel, multi-
technology routing fabrics and networks operating under high load.
B. Protocol Characteristics and Mechanisms
* Does the protocol provide support for unidirectional links?
(if so, how?)
Yes. The ZRP provides "local" support for unidirectional links.
A unidirectional link can be used as long as the link source and
link destination lie within each other's routing zone.
* Does the protocol require the use of tunneling? (if so, how?)
No.
* Does the protocol require using some form of source routing?
(if so, how?)
No. The ZRP's framework supports global route discovery based
on source routing, distributed distance vectors, or various
combinations of both.
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* Does the protocol require the use of periodic messaging?
(if so, how?)
Yes. The ZRP framework proactively maintains local routing
information (routing zones) based on periodic exchanges of
neighbor discovery messages.
* Does the protocol require the use of reliable or sequenced packet
delivery? (if so, how?)
The ZRP only assumes that link-layer (neighbor) unicasts are
delivered reliably and in-sequence. Reliable and sequenced
delivery of neighbor broadcasts and IP unicasts is not
required.
* Does the protocol provide support for routing through a multi-
technology routing fabric? (if so, how?)
Yes. It is assumed that each node's network interface is
assigned a unique IP address.
* Does the protocol provide support for multiple hosts per router?
(if so, how?)
Yes. Multiple hosts may be associated with a router. These
hosts can be identified by the neighbor discovery/maintenance
process.
By default, it is assumed that a host's association with a router
is not permanent. As a result, the ZRP exchanges routing
information for individual hosts in the same manner as routing
information for routers.
In cases where a router is permanently associated with a network
(subnetwork), the ZRP supports the exchange of network
(subnetwork) prefixes in place of all aggregated host IP
addresses.
* Does the protocol support the IP addressing architecture?
(if so, how?)
Yes. Each node is assumed to have a unique IP address (or
set of unique IP addresses in the case of multiple interfaces).
The ZRP references all nodes/interfaces by their IP address.
This version of the ZRP also supports IP network addressing
(network prefixes) for routers that provide access to a
network of non-router hosts.
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* Does the protocol require link or neighbor status sensing
(if so, how?)
Yes. The ZRP proactively maintains local routing information
(routing zones) based on detected changes in neighbor status.
* Does the protocol have dependence on a central entity?
(if so, how?)
No. The ZRP is a fully distributed protocol.
* Does the protocol function reactively? (if so, how?)
Yes. The ZRP's GLOBAL route discovery mechanism is reactive.
A route query is initiated, on demand, when a node requires
routing information that is not immediately available in its
routing table.
The route query propagates through the network, using a special
packet delivery service called "bordercasting". Bordercasting
leverages knowledge of local network topology to direct route
queries away from the source, thereby reducing redundancy.
* Does the protocol function proactively? (if so, how?)
Yes. The ZRP proactively maintains LOCAL routing information
(routing zones) for each node. The routing zone information is
leveraged, through the bordercasting mechanism, to support
efficient global propagation of route queries.
* Does the protocol provide loop-free routing? (if so, how?)
Yes. If the reactive Interzone Routing is based on source
routing, loop-freedom in the route discovery process is ensured
by inspection of accumulated source routes. For distributed
distance vector approaches, loop-freedom can be ensured by
labeling queries (replies) with the source (destination) address
and locally unique sequence number. Nodes that relay these
messages can temporarily cache these identifiers in order to
identify and terminate loops.
The proactive Intrazone Routing based on link states is
inherently loop-free, although temporary loops may form while new
link state updates propagate through the routing zone.
* Does the protocol provide for sleep period operation? (if so, how?)
No. Sleep period operation is not addressed in this draft.
However, sleep period support can be included as needed.
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* Does the protocol provide some form of security? (if so, how?)
No. It is assumed that security issues are adequately addressed
by the underlying protocols (IPsec, for example).
* Does the protocol provide support for utilizing multi-channel,
link-layer technologies? (if so, how?)
Yes. It is assumed that each node's network interface is
assigned a unique IP address.
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1. Introduction
One of the major challenges in designing a routing protocol for the
ad hoc networks stems from the fact that, on one hand, to determine
a packet route, a node needs to know at least the reachability
information to its neighbors. On the other hand, in an ad hoc
network, the network topology can change quite often. Furthermore,
as the number of network nodes can be large, the potential number of
destinations is also large, requiring large and frequent exchange of
data (e.g., routes, routes updates, or routing tables) among the
network nodes. Thus, the amount of update traffic can be quite high.
This is in contradiction with the fact that all updates in a
wirelessly interconnected ad hoc network travel over the air and,
thus, are costly in resources.
In general, the existing routing protocols can be classified either
as proactive or as reactive. Proactive protocols attempt to
continuously evaluate the routes within the network, so that when
a packet needs to be forwarded, the route is already known and can
be immediately used. The family of Distance-Vector protocols is an
example of a proactive scheme. Examples of proactive routing
protocols include the Wireless Routing Protocol (WRP) [11] and
Destination-Sequenced Distance-Vector (DSDV) routing [16]. Reactive
protocols, on the other hand, invoke a route determination procedure
on demand only. Thus, when a route is needed, some sort of global
search procedure is employed. The family of classical flooding
algorithms belong to the reactive group. Some other examples of
reactive (also called on-demand) ad hoc network routing protocols are
Dynamic Source Routing (DSR) [9], Ad-hoc On demand Distance Vector
Routing (AODV) [17] and the Temporally Ordered Routing Algorithm
(TORA) [13].
The advantage of the proactive schemes is that, once a route is
needed, there is little delay until the route is determined. In
reactive protocols, because route information may not be available
at the time a datagram is received, the delay to determine a route
can be quite significant. Furthermore, the global flood-search
procedure of the reactive protocols requires significant control
traffic. Because of this long delay and excessive control traffic,
pure reactive routing protocols may not be applicable to real-time
communication. However, pure proactive schemes are likewise not
appropriate for the ad hoc networking environment, as they
continuously use a large portion of the network capacity to keep the
routing information current. Since nodes in an ad hoc network move
quite fast, and as the changes may be more frequent than the route
requests, most of this routing information is never even used! This
results in a further waste of the wireless network capacity. What is
needed is a protocol that, on one hand, initiates the route
determination procedure on-demand, but at limited search cost. The
protocol described in this draft, termed the "Zone Routing Protocol
(ZRP)" ([1],[2],[14]), is an example of a such a hybrid proactive/
reactive scheme.
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The ZRP, on one hand, limits the scope of the proactive procedure
only to the node's local neighborhood. On the other hand, the search
throughout the network, although global in nature, is done by
efficiently querying selected nodes in the network, as opposed to
querying all the network nodes.
A related issue is that of updates in the network topology. For a
routing protocol to be efficient, changes in the network topology
should have only a local effect. In other words, creation of a new
link at one end of the network is an important local event but, most
probably, not a significant piece of information at the other end of
the network. Globally proactive protocols tend to distribute such
topological changes widely in the network, incurring large costs. The
ZRP limits propagation of such information to the neighborhood of the
change only, thus limiting the cost of topological updates.
2. Overview of the Zone Routing Framework
In the Zone Routing framework, a proactive routing protocol provides a
detailed and fresh view of each node's surrounding local topology
(routing zone) at the local level. The knowledge of local topology is
used to support services such as proactive route maintenance,
unidirectional link discovery and guided message distribution. One
particular message distribution service, called bordercasting [5],
directs queries throughout the network across overlapping routing
zones. Bordercasting is used in place of traditional broadcasting to
improve the efficiency of a global reactive routing protocol.
The benefits provided by routing zones, compared with the overhead of
proactively tracking routing zone topology, determine the optimal
framework configuration. As network conditions change, the framework
can be dynamically reconfigured through adjustment of each node's
routing zone
2.1 Routing Zones and the Intrazone Routing Protocol (IARP)
In Zone Routing, the Intrazone Routing Protocol (IARP) proactively
maintains routes to destinations within a local neighborhood, which we
refer to as a routing zone. More precisely, a node's routing zone is
defined as a collection of nodes whose minimum distance in hops from
the node in question is no greater than a parameter referred to as the
zone radius. Note that each node maintains its own routing zone. An
important consequence is that the routing zones of neighboring nodes
overlap.
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An example of a routing zone (for node A) of radius 2 is shown below.
+-----------------------------------------+
| +---+ |
| +---+ ---| F |-------| |
+---+ | +---+ --| C |--/ +---+ +---+ |
| G |-----| D |--/ +---+ | E | | Routing Zone of
+---+ | +---+ | +---+ +---+ | node A
| +---+ ---| B |-------| | (radius = 2 hops)
| | A |--/ +---+ |
| +---+ |
+-----------------------------------------+
Note that in this example nodes B through F are within the routing
zone of A. Node G is outside A's routing zone. Also note that E can be
reached by two paths from A, one with length 2 hops and one with
length 3 hops. Since the minimum is less or equal than 2, E is within
A's routing zone.
Peripheral nodes are nodes whose minimum distance to the node in
question is equal exactly to the zone radius. Thus, in the above
figure, nodes D, F, and E are A's peripheral nodes.
The construction of a routing zone requires a node to first know who
its neighbors are. A neighbor is defined as a node with whom direct
(point-to-point) communication can be established and is, thus, one
hop away. Identification of a node's neighbors may be provided
directly by the media access control (MAC) protocols, as in the case
of polling-based protocols. In other cases, neighbor discovery may
be implemented through a separate Neighbor Discovery Protocol (NDP).
Such a protocol typically operates through the periodic broadcasting
of "hello" beacons. The reception (or quality of reception) of a
"hello" beacon can be used to indicate the status of a connection to
the beaconing neighbor.
Neighbor discovery information is used as a basis for the IARP.
IARP can be derived from globally proactive link state routing
protocols that provide a complete view of network connectivity.
[3] describes the Intrazone Routing Protocol (IARP) in detail and
lists the conversion guidelines for adapting a proactive link-state
based routing protocol to serve as an IARP.
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2.2 Bordercast-Based Global Reactive (Interzone) Routing
Route discovery in the Zone Routing framework is distinguished from
standard broadcast-based route discovery through a message
distribution service known as the Bordercast Resolution Protocol (BRP)
[5]. Rather than blindly broadcasting a route query from neighbor to
neighbor, bordercasting allows the query to be directed outward,
toward regions of the network (specifically, toward peripheral nodes)
that have not yet been "covered" by the query. (A covered node is one
that belongs to the routing zone of a node that has received a route
query). The query control mechanisms reduce route query traffic by
directing query messages outward from the query source and away from
covered routing zones.
A node can determine local query coverage by noting the addresses of
neighboring nodes that have forwarded the query. In the case of
multiple channel networks, a node can only detect query packets that
have been directly forwarded to it. For single channel networks, a
node may be able to detect any query packet forwarded within the
node's radio range. When a node identifies a query forwarding
neighbor, all known members of that neighbor's routing zone (i.e.,
those members which belong to both the node's and neighbor's routing
zones) are marked as covered.
When a node is called upon to relay a bordercast message, it again
uses its routing zone topology to construct a bordercast tree, that is
rooted at itself and spans its uncovered peripheral nodes. The
message is then forwarded to those neighbors in the bordercast tree.
By virtue of the fact that this node has forwarded the query, all of
its routing zone members are marked as covered. Therefore, a
bordercasting node will not forward a query more than once.
The details of the Bordercast Resolution Protocol are described in [5].
Given the availability of an underlying bordercast service, the
operation of Zone Routing's global reactive Interzone Routing Protocol
(IERP) is quite similar to standard route discovery protocols. An IERP
route discovery is initiated when no route is locally available to the
destination of an outgoing data packet. The source generates a route
query packet, which is uniquely identified by a combination of the
source node's address and request number. The query is then relayed to
a subset of neighbors as determined by the bordercast algorithm. Upon
receipt of a route query packet, a node checks if the destination lies
in its zone or if a valid route to it is available in its route cache.
If the answer is affirmative, a route reply is sent back to the
source. If not, the node bordercasts the query again. The operation of
the IERP is sufficiently general, so that many existing reactive
protocols can be used as an IERP with minimal modification. The
details of IERP's operation can be found in [4].
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3.0 The ZRP Architecture
.........................................
: Z R P :
: :
+---------+ : +---------+ +---------+ : +---------+
| NDP |========>| IARP |========>| IERP |<========| ICMP |
+---------+ : +---------+ |---+-----+ : +---------+
/|\ : /|\ |BRP| /|\ : /|\
| : | +---+ | : |
| : | /|\ | : |
| :...........|................|.....|....: |
| | | | |
\|/ \|/ \|/ \|/ \|/
+---------+---------+---------+---------+---------+---------+---------+
| IP |
+---------+---------+---------+---------+---------+---------+---------+
Legend:
A <---> B exchange of packets between protocols A & B
A ===> B information passed from protocol A to protocol B
Existing Protocols
------------------
IP Internet Protocol
ICMP Internet Control Message Protocol
ZRP Entities
------------
IARP IntrAzone Routing Protocol
IERP IntErzone Routing Protocol
BRP Bordercast Resolution Protocol
Additional Protocols
--------------------
NDP Neighbor Discovery Protocol
The architecture of the hybrid Zone Routing framework is modular, so
that a link state routing protocol can be used as an IARP [3] and an
on-demand routing protocol can be used as an IERP [4]. As an example,
consider TBRPF [12] or OLSR [7] as an IARP and AODV [15] or DSR [8] as
an IERP.
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4. Other Considerations
4.1 Sizing the Zone Radius
The performance of the Zone Routing Protocol is determined by the
routing zone radius. In general, dense networks consisting of a few
fast moving nodes favor smaller routing zones. On the other hand, a
sparse network of many slowly moving nodes operates more efficiently
with a larger zone radius.
The simplest approach to configuring the routing zone radius is to
make the assignment once, prior to deploying the network. This can
be performed by the network administration, if one exists, or by
the manufacturer, as a default value. This may provide acceptable
performance, especially in situations where network characteristics
do not vary greatly over space and time. Alternatively, the ZRP can
adapt to changes in network behavior, through dynamic configuration
of the zone radius [6]. In [14], it was shown that a node can
accurately estimate its optimal zone radius, on-line, based on local
measurements of ZRP traffic. The re-sizing of the routing zone can be
carried out by a protocol that conveys the change in zone radius to
the members of the routing zone.
In Zone Routing with independently sized routing zones capability,
each of the nodes in the network can adaptively configure its own
optimal zone radius in a distributed fashion. The performance of Zone
Routing is further improved by the ability to provide fine-tuned
adaptation to local and temporal variations in network characteristics
[19]. The details of the Independent Zone Routing (IZR) framework will
be included in a future version of this draft.
4.2 Hierarchical Routing and the ZRP
In a hierarchical network architecture, network nodes are organized
into a smaller number of (often disjoint) clusters. This routing
hierarchy is maintained by two component routing protocols. An intra-
cluster protocol provides routes between nodes of the same cluster,
while an inter-cluster protocol operates globally to provide routes
between clusters.
The ZRP, with its routing zones and intrazone / interzone routing
protocol (IARP/IERP) architecture may give the appearance of being a
hierarchical routing protocol. In actuality, the ZRP is a flat
routing protocol. Each node maintains its own routing zone, which
heavily overlaps with the routing zones of neighboring nodes. Because
there is a one-to-one correspondence between nodes and routing zones,
the routing zones, unlike hierarchical clusters, do not serve to hide
the details of local network topology. As a result, the network-wide
interzone routing protocol (IERP) actually determines routes between
individual nodes, rather than just between higher level network
entities.
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For small to moderately sized networks, flat routing protocols, like
the ZRP, are preferable to hierarchical routing protocols. In order
for a node to be located, its address needs to reflect the node's
location within the network hierarchy (i.e. {cluster id,node id}).
Because of node mobility, a node's cluster membership (and thus
address) is subject to change. This complicates mobility management,
for the benefit of more efficient routing. In many hierarchical
routing protocols, each cluster designates a single clusterhead node
to relay inter-cluster traffic. These clusterhead nodes become
traffic "hot-spots", potentially resulting in network congestion and
single point of failure. Furthermore, restricting cluster access
through clusterhead nodes can lead to sub-optimal routes, as potential
neighbors in different clusters are prohibited from communicating
directly. Some hierarchical routing protocols, such as the
Zone-Based Hierarchical Link-State (ZHLS) [8], avoid these problems by
distributing routing information to all cluster nodes, rather than
maintaining a single clusterhead.
In spite of these disadvantages, hierarchical routing protocols are
often better suited for very large networks than flat routing
protocols. Because hierarchical routing protocols provide global
routes to network clusters, rather than individual nodes, routing
table storage is more scalable. Similarly, the amount of route update
messages is also more scalable. To some extent, the reduction in
routing traffic is offset by extra mobility management overhead (i.e.
identifying which cluster a node belongs to). However, it is quite
common that the environment or existing organizational structure
causes nodes to naturally cluster together. In these cases, there may
be a high degree of intra-cluster mobility, with inter-cluster
mobility is less common.
A hierarchical routing protocol can be viewed as a set of flat routing
protocols, each operating at different levels of granularity. In a
two-tier routing protocol, the inter-cluster components is essentially
a flat routing protocol that computes routes between clusters.
Likewise, the intra-cluster component is a flat routing protocol, that
computes routes between nodes in each cluster. For example, the Near
Term Digital Radio (NTDR) System [18] and ZHLS both employ proactive
link state protocols to determine inter and intracluster connectivity.
In place of traditional proactive or reactive protocols, we recommend
that the intra-cluster and inter-cluster routing protocol components
be implemented based on the hybrid proactive/reactive ZRP. As
described throughout this draft, the ZRP is designed to provide an
optimal balance between purely proactive and reactive routing. This
applies equally well to routing between nodes at the intra-cluster
level and between clusters at the inter-cluster level. Additionally,
the hybrid ZRP methodology can be applied to the related mobility
management protocols, which determine complete node addresses based on
a node's location in the network hierarchy.
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5. Patent Rights Statement
Cornell University has filed one or more patents protecting the
inventions described in this submission (the "Patents"). If Cornell
University's submission, or material portions thereof, is accepted and
becomes part of the IETF standard (the "Standard"), then Cornell will
grant any entity wishing to practice the Standard a non-exclusive,
royalty-free license under the Patents to the extent, but only to the
extent, that such license is required to implement (a) mandatory
elements of the Standard; or (b) elements of Cornell's submission that
are explicitly specified (and not merely incorporated by reference) in
the Standard.
Use of any elements of Cornell's submission that are neither required
in order to implement the Standard nor explicitly specified in the
Standard will require an additional license from Cornell University
under terms to be negotiated between the parties.
While the protocol disclosed in Cornell's submission is being
evaluated by the IETF, whether on the standards track or otherwise,
Cornell University will and hereby does grant any party a license to
utilize, test and evaluate such protocol solely for non-commercial,
research purposes.
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6. References
[1] Haas, Z.J., "A New Routing Protocol for the Reconfigurable
Wireless Networks," ICUPC'97, San Diego, CA, Oct. 12,1997.
[2] Haas, Z.J. and Pearlman, M.R., "The Performance of Query
Control Schemes for the Zone Routing Protocol,"
SIGCOMM'98, Vancouver, BC, Sept. 2-4, 1998.
[3] Haas, Z.J., Pearlman, M.R. and Samar, P., "Intrazone Routing
Protocol (IARP)," IETF Internet Draft,
draft-ietf-manet-iarp-02.txt, July 2002.
[4] Haas, Z.J., Pearlman, M.R. and Samar, P., "Interzone Routing
Protocol (IERP)," IETF Internet Draft,
draft-ietf-manet-ierp-02.txt, July 2002.
[5] Haas, Z.J., Pearlman, M.R. and Samar, P., "Bordercasting
Resolution Protocol (BRP)," IETF Internet Draft,
draft-ietf-manet-brp-02.txt, July 2002.
[6] Haas, Z.J. and Tabrizi, S., "On Some Challenges and Design
Choices in Ad-Hoc Communications," MILCOM'98, Boston, MA,
October 18-21, 1998.
[7] Jacquet, P., Muhlethaler, P., Qayyum A., Laouiti A., Viennot L.,
and Clausen T., "Optimized Link State Routing Protocol,"
IETF Internet Draft, draft-ietf-manet-olsr-03.txt,
November 2000.
[8] Joa-Ng, M. and Lu, I.T., "A Peer-to-Peer Zone-based Two-Level
Link State Routing for Mobile Ad-Hoc Networks," to appear
in IEEE JSAC issue on Ad-Hoc Networks, June, 1999.
[9] Johnson, D.B., and Maltz, D.A., "Dynamic Source Routing
in Ad-Hoc Wireless Networks," in Mobile Computing,
edited by T. Imielinski and H. Korth, chapter 5,
pp. 153-181, Kluwer, 1996.
[10] Moy, J., "OSPF Version 2," INTERNET DRAFT STANDARD,
RFC 2178, July 1997.
[11] Murthy, S., and Garcia-Luna-Aceves, J.J., "An Efficient
Routing Protocol for Wireless Networks," MONET, vol. 1,
no. 2, pp. 183-197, October 1996.
[12] Ogier, R. "Efficient Routing Protocols for Packet-Radio
Networks Based on Tree Sharing," MoMUC '99, November 1999.
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[13] Park, V.D., and Corson, M.S., "A Highly Adaptive Distributed
Routing Algorithm for Mobile Wireless Networks,"
IEEE INFOCOM'97, Kobe, Japan, 1997.
[14] Pearlman, M.R. and Haas, Z.J., "Determining the Optimal
Configuration for the Zone Routing Protocol," IEEE JSAC,
August, 1999.
[15] Pearlman, M.R. and Haas, Z.J., "Improving the Performance of
of Query-Based Routing Protocols Through 'Diversity
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[16] Perkins, C.E., and Bhagwat, P., "Highly Dynamic
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[17] Perkins, C.E. and Royer, E.M., "Ad-Hoc On-Demand Distance
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[18] Ruppe, R., Griswald, S., Walsh, P. and Martin, R., "Near Term
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[19] Samar, P., Pearlman, M.R. and Haas, Z.J., "Hybrid Routing: The
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[20] Waitzman, D., Partridge, C., Deering, S.E., "Distance
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Haas, Pearlman, Samar Expires January 2003 [Page 10]
INTERNET DRAFT The Zone Routing Protocol July 2002
Authors' Information
Zygmunt J. Haas
Wireless Networks Laboratory
323 Frank Rhodes Hall
School of Electrical & Computer Engineering
Cornell University
Ithaca, NY 14853
United States of America
tel: (607) 255-3454, fax: (607) 255-9072
Email: haas@ece.cornell.edu
Marc R. Pearlman
389 Frank Rhodes Hall
School of Electrical & Computer Engineering
Cornell University
Ithaca, NY 14853
United States of America
tel: (607) 255-0236, fax: (607) 255-9072
Email: pearlman@ece.cornell.edu
Prince Samar
374 Frank Rhodes Hall
School of Electrical & Computer Engineering
Cornell University
Ithaca, NY 14853
United States of America
tel: (607) 255-9068, fax: (607) 255-9072
Email: samar@ece.cornell.edu
The MANET Working Group contacted through its chairs:
M. Scott Corson
Institute for Systems Research
University of Maryland
College Park, MD 20742
(301) 405-6630
corson@isr.umd.edu
Joseph Macker
Information Technology Division
Naval Research Laboratory
Washington, DC 20375
(202) 767-2001
macker@itd.nrl.navy.mil
Haas, Pearlman, Samar Expires January 2003 [Page 11]
