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Cross-Layer Service Discovery Mechanism for OLSRv2 Mobile Ad Hoc Networks.

Vara MI, Campo C - Sensors (Basel) (2015)

Bottom Line: Each node in the ad hoc network only advertises its own services.Each node maintains two service tables, one to store information about its own services and another one to store information about the services it discovers in the network.We present simulation results, that compare our service discovery integrated into OLSRv2 with the one defined for OLSRv1 and with the integration of service discovery in Ad hoc On-demand Distance Vector (AODV) protocol, in terms of service discovery ratio, service latency and network overhead.

View Article: PubMed Central - PubMed

Affiliation: Department of Telematic Engineering, University Carlos III of Madrid, Avda. de la Universidad 30, 28911 Leganes, Madrid, Spain. maribelvaralorenzo@gmail.com.

ABSTRACT
Service discovery plays an important role in mobile ad hoc networks (MANETs). The lack of central infrastructure, limited resources and high mobility make service discovery a challenging issue for this kind of network. This article proposes a new service discovery mechanism for discovering and advertising services integrated into the Optimized Link State Routing Protocol Version 2 (OLSRv2). In previous studies, we demonstrated the validity of a similar service discovery mechanism integrated into the previous version of OLSR (OLSRv1). In order to advertise services, we have added a new type-length-value structure (TLV) to the OLSRv2 protocol, called service discovery message (SDM), according to the Generalized MANET Packet/Message Format defined in Request For Comments (RFC) 5444. Each node in the ad hoc network only advertises its own services. The advertisement frequency is a user-configurable parameter, so that it can be modified depending on the user requirements. Each node maintains two service tables, one to store information about its own services and another one to store information about the services it discovers in the network. We present simulation results, that compare our service discovery integrated into OLSRv2 with the one defined for OLSRv1 and with the integration of service discovery in Ad hoc On-demand Distance Vector (AODV) protocol, in terms of service discovery ratio, service latency and network overhead.

No MeSH data available.


Service discovery delay vs. average speed (left) vs. service redundancy (right) in SD-OLSRv2 and SD-AODV.
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f14-sensors-15-17621: Service discovery delay vs. average speed (left) vs. service redundancy (right) in SD-OLSRv2 and SD-AODV.

Mentions: On the other hand, in SD-AODV, the average time to access a service decreases as the server redundancy increases; Figure 14. However, whereas in SD-OLSRv2, services are available almost immediately, it takes hundredths of seconds in SD-AODV. This can be explained as follows. Proactive protocols produce higher routing efficiency than reactive protocols. OLSR maintains an up-to-date routing table at all times. When a node in a network running the OLSR protocol wants to find a route to a node, it only has to look in its routing table, whereas in an AODV network, a route discovery process has to be started. It goes without saying that looking in the routing table takes less time than flooding the network for a route discovery.


Cross-Layer Service Discovery Mechanism for OLSRv2 Mobile Ad Hoc Networks.

Vara MI, Campo C - Sensors (Basel) (2015)

Service discovery delay vs. average speed (left) vs. service redundancy (right) in SD-OLSRv2 and SD-AODV.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541951&req=5

f14-sensors-15-17621: Service discovery delay vs. average speed (left) vs. service redundancy (right) in SD-OLSRv2 and SD-AODV.
Mentions: On the other hand, in SD-AODV, the average time to access a service decreases as the server redundancy increases; Figure 14. However, whereas in SD-OLSRv2, services are available almost immediately, it takes hundredths of seconds in SD-AODV. This can be explained as follows. Proactive protocols produce higher routing efficiency than reactive protocols. OLSR maintains an up-to-date routing table at all times. When a node in a network running the OLSR protocol wants to find a route to a node, it only has to look in its routing table, whereas in an AODV network, a route discovery process has to be started. It goes without saying that looking in the routing table takes less time than flooding the network for a route discovery.

Bottom Line: Each node in the ad hoc network only advertises its own services.Each node maintains two service tables, one to store information about its own services and another one to store information about the services it discovers in the network.We present simulation results, that compare our service discovery integrated into OLSRv2 with the one defined for OLSRv1 and with the integration of service discovery in Ad hoc On-demand Distance Vector (AODV) protocol, in terms of service discovery ratio, service latency and network overhead.

View Article: PubMed Central - PubMed

Affiliation: Department of Telematic Engineering, University Carlos III of Madrid, Avda. de la Universidad 30, 28911 Leganes, Madrid, Spain. maribelvaralorenzo@gmail.com.

ABSTRACT
Service discovery plays an important role in mobile ad hoc networks (MANETs). The lack of central infrastructure, limited resources and high mobility make service discovery a challenging issue for this kind of network. This article proposes a new service discovery mechanism for discovering and advertising services integrated into the Optimized Link State Routing Protocol Version 2 (OLSRv2). In previous studies, we demonstrated the validity of a similar service discovery mechanism integrated into the previous version of OLSR (OLSRv1). In order to advertise services, we have added a new type-length-value structure (TLV) to the OLSRv2 protocol, called service discovery message (SDM), according to the Generalized MANET Packet/Message Format defined in Request For Comments (RFC) 5444. Each node in the ad hoc network only advertises its own services. The advertisement frequency is a user-configurable parameter, so that it can be modified depending on the user requirements. Each node maintains two service tables, one to store information about its own services and another one to store information about the services it discovers in the network. We present simulation results, that compare our service discovery integrated into OLSRv2 with the one defined for OLSRv1 and with the integration of service discovery in Ad hoc On-demand Distance Vector (AODV) protocol, in terms of service discovery ratio, service latency and network overhead.

No MeSH data available.