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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.


Network overhead in OLSRv1 and OLSRv2 with service discovery.
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f11-sensors-15-17621: Network overhead in OLSRv1 and OLSRv2 with service discovery.

Mentions: In Figure 11, we can see that OLSRv2 incurs less overhead in the network than OLSRv1 when services are announced. We also see that the difference is bigger as the number of nodes increases. Furthermore, the difference is greater as the announcement of services becomes less frequent. This result was expected because in OLSRv1, all of the HELLO, TC and SDM messages have the OLSR header, while in OLSRv2, the service announcement is integrated as a TLV structure in HELLO and TC messages. Anyway, for both OLSRv1 and OLSRv2, the smaller the SDM INTERVAL_TIME parameter is, the more overhead is introduced to the network. Although the overhead increment is more significant as the size of the network increases, in small networks, the SDM INTERVAL_TIME user-configurable parameter is not critical in terms of network overhead.


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

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

Network overhead in OLSRv1 and OLSRv2 with service discovery.
© Copyright Policy
Related In: Results  -  Collection

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

f11-sensors-15-17621: Network overhead in OLSRv1 and OLSRv2 with service discovery.
Mentions: In Figure 11, we can see that OLSRv2 incurs less overhead in the network than OLSRv1 when services are announced. We also see that the difference is bigger as the number of nodes increases. Furthermore, the difference is greater as the announcement of services becomes less frequent. This result was expected because in OLSRv1, all of the HELLO, TC and SDM messages have the OLSR header, while in OLSRv2, the service announcement is integrated as a TLV structure in HELLO and TC messages. Anyway, for both OLSRv1 and OLSRv2, the smaller the SDM INTERVAL_TIME parameter is, the more overhead is introduced to the network. Although the overhead increment is more significant as the size of the network increases, in small networks, the SDM INTERVAL_TIME user-configurable parameter is not critical in terms of network overhead.

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.