Planning the mobility of routing ferries for intermittently connected mobile networks

2011 ◽  
Author(s):  
Zhi-Jun Li ◽  
Shou-Xu Jiang
Keyword(s):  
Mobile Networks ◽  
Intermittently Connected

Optimized Replication Strategy for Intermittently Connected Mobile Networks

2012 ◽  
Vol 8 (1) ◽  
pp. 1-18 ◽  
Author(s):  
C. Poongodi ◽  
A. M. Natarajan
Keyword(s):  
Mobile Networks ◽  
Mobile Ad Hoc Network ◽  
Relay Node ◽  
Resource Consumption ◽  
Delivery Ratio ◽  
High Resource ◽  
Maximum Delay ◽  
Replication Strategy ◽  
Network Overhead ◽  
Intermittently Connected

Intermittently Connected Mobile Networks (ICMNs) are wireless networks where due to mobility of nodes and lack of connectivity, there may be disconnection among the nodes. Hence, the routing path from source to destination is not always available. In this case, Mobile Ad-hoc Network (MANET) protocols will not be utilized. In these networks, messages are to be flooded or multiple replications are needed to withstand the maximum delay and achieve the high delivery ratio. But multiple replication based protocols result in increased network overhead and high resource consumption because of uncontrolled replication. In this paper, the authors introduce a new simple scheme which applies knapsack policy based replication strategy in replicating the messages. The number of replication is reduced by appropriately selecting only limited messages based on the number of duplications of its own and its size. The messages are selected for forwarding to relay node based on the goodness of the relay node in contacting the destination and the buffer size of the relay node. Therefore, only limited messages will be replicated in the network and it will reduce the network overhead, resource consumption, delivery delay and increases the delivery ratio.

scholarly journals Impact of buffer size and TTL on DTN routing protocols in intermittently connected mobile networks

2018 ◽  
Vol 7 (3) ◽  
pp. 1735 ◽  
Author(s):  
Md. Sharif Hossen ◽  
Md. Masum Billah ◽  
Suraiya Yasmin
Keyword(s):  
Mobile Networks ◽  
Routing Protocols ◽  
Network Performance ◽  
Performance Metrics ◽  
Limited Resources ◽  
Buffer Size ◽  
Delivery Ratio ◽  
Dtn Routing ◽  
The Impact ◽  
Intermittently Connected

Delay-Tolerant Networks (DTNs) are kinds of networks where there does not exist any complete end-to-end route from source to destination. Such networks can also be referred to as Intermittently Connected Mobile Networks (ICMNs), which are featured by asymmetric data rates, large delay, limited resources and high error rates. In this network, size of buffer and Time-to-Live (TTL) for fixed number of nodes and message generation rates contribute to the network performance because of limited resources and short life span of a packet in the net-work. Therefore, investigating efficient routing for altering TTL and size of buffer is very important for overall network performance. This paper presents a performance analysis based on simulation of the impact of buffer size and TTL for several DTN routing protocols in ICMNs scenario. ONE, i.e., Opportunistic Network Environment is used to simulate the routing protocols considering three performance metrics: delivery ratio, mean latency and overhead ratio. Investigated results mention that Spray-and-Focus (SNF) routing exhibits the best performance for altering TTL and size of buffer than other DTN routing protocols, i.e., Epidemic, PRoPHET, PRoPHETv2, MaxProp, RAPID, and Binary-SNW in the considered performance metrics and simulation scenario. 

Buffer Managed Multiple Replication Strategy Using Knapsack Policy for Intermittently Connected Mobile Networks

2014 ◽  
pp. 1-22
Author(s):  
C. Poongodi ◽  
A. M. Natarajan
Keyword(s):  
Mobile Networks ◽  
Relay Node ◽  
Resource Consumption ◽  
Delivery Ratio ◽  
Global Knowledge ◽  
High Resource ◽  
Replication Strategy ◽  
Long Time ◽  
Network Overhead ◽  
Intermittently Connected

Intermittently Connected Mobile Networks (ICMNs) are a kind of wireless network where, due to mobility of nodes and lack of connectivity, there may be disconnections among the nodes for a long time. To deal with such networks, store-carry-forward method is adopted for routing. This method buffers the messages in each node for a long time until a forwarding opportunity comes. Multiple replications are made for each message. It results in an increase in network overhead and high resource consumption because of uncontrolled replications. Uncontrolled replications are done due to lack of global knowledge about the messages and the forwarding nodes. The authors introduce a new simple scheme that applies knapsack policy-based replication strategy while replicating the messages residing in a node buffer. The numbers of replications are controlled by appropriately selecting messages based on the total count on replications already made and the message size. In addition, the messages are selected for forwarding based on the relay node goodness in contacting the destination and the remaining buffer size of that relay node. Therefore, useful replications are made based on the dynamic environment of a network, and it reduces the network overhead, resource consumption, delivery delay, and in turn, increases the delivery ratio.

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