A Data Cooperative Caching Policy Using Human Mobile Patterns for Delay Tolerant Networks

2010 ◽  
Vol 171-172 ◽  
pp. 561-564
Author(s):  
Hui Ye ◽  
Zhi Gang Chen ◽  
Xiao Jian Shen
Keyword(s):  
Network Performance ◽  
Data Dissemination ◽  
Delay Tolerant Networks ◽  
Cooperative Caching ◽  
Network Cost ◽  
Movement Characteristics ◽  
Delay Tolerant ◽  
The Impact ◽  
Caching Policy ◽  
Address Matching

Recently, many researchers focus on delay tolerant networks (DTN). In DTN, the mobile characteristic of nodes is used to help transfer data. Therefore, how to use the cooperative relations and cache resource of nodes effectively to avoid network congestion and improve network performance is an important issue. In this paper, we proposed a cooperative caching policy based on human mobile patterns, which referred as HMP-Cache. The node movement characteristics are discussed in detail in HMP-Cache. HMP-Cache uses the standard of target address matching to choose cooperative caching nodes. In addition, the sharing caching information is done by synchronization of caching table in local region. Therefore, the impact of useless data dissemination of multiple hops is reduced. And the shortcoming of limited caching resources is compensated. The simulation results show that our policy can control the network cost effectively. Also, the remote data latency is reduced.

scholarly journals DEFENSE STRATEGY AGAINST SELFISH NODES TAKING INTO ACCOUNT TRAFFIC DIFFERENTIATION IN VEHICULAR DELAY-TOLERANT NETWORKS

2021 ◽  
Vol 9 (01) ◽  
pp. 1138-1156
Author(s):  
Gballou Yao Theophile ◽  
◽  
Toure Kidjegbo Augustin ◽  
Tiecoura Yves ◽  
◽  
...  
Keyword(s):  
Memory Management ◽  
Network Performance ◽  
Transmission Rate ◽  
Buffer Management ◽  
Delay Tolerant Networks ◽  
Selfish Nodes ◽  
Priority Class ◽  
Network Overload ◽  
Delay Tolerant ◽  
The Impact

Vehicular Delay-Tolerant Networks (VDTNs) are vehicle networks where there is no end-to-end connectivity between source and destination. As a result, VDTNs rely on cooperation between the different nodes to improve its performance. However, the presence of selfish nodes that refuse to participate in the routing protocol causes a deterioration of the overall performance of these networks. In order to reduce the impact of these selfish nodes, proposed strategies, on the one hand, use the nodes transmission rate that does not take into account the message priority class of service, and on the other hand, are based on traditional buffer management systems (FIFO, Random). As a result, quality of service is not guaranteed in this type of network where different applications are derived from messages with different priorities. In this paper, we propose a strategy for detecting selfish nodes and taking action against them in relation to priority classes in order to reduce their impacts. The operation of this strategy is based, on a partitioned memory management system taking into account the priority and the lifetime of messages, on the calculation of the transmission rate of the node with respect to the priority class of the node with the highest delivery predictability, on a mechanism for calculating the nodes degree of selfishness with respect to the priority class, and on the monitoring mechanism. . The simulations carried out show that the proposed model can detect selfish nodes and improve network performance in terms of increasing the delivery rate of high-priority messages, reducing the delivery delay of high-priority messages, and reducing network overload.

scholarly journals A survey of routing and data dissemination in Delay Tolerant Networks

2016 ◽  
Vol 67 ◽  
pp. 128-146 ◽  
Author(s):  
Sobin CC ◽  
Vaskar Raychoudhury ◽  
Gustavo Marfia ◽  
Ankita Singla
Keyword(s):  
Data Dissemination ◽  
Delay Tolerant Networks ◽  
Delay Tolerant

scholarly journals Towards Intelligent Caching and Retrieval Mechanisms for Upcoming Proposals on Vehicular Delay-Tolerant Networks

2011 ◽  
Vol 7 (1) ◽  
pp. 1 ◽  
Author(s):  
Bruno M. C. Silva ◽  
Vasco N. G. J. Soares ◽  
Joel J. P. C. Rodrigues
Keyword(s):  
Network Performance ◽  
Ad Hoc ◽  
Storage Capacity ◽  
State Of The Art ◽  
Delay Tolerant Networks ◽  
Opportunistic Networks ◽  
Network Nodes ◽  
Intermittent Connectivity ◽  
Delay Tolerant ◽  
Carry And Forward

Vehicular delay-tolerant networks (VDTNs) are opportunistic networks that enable connectivity in challenged scenarios with unstable links where end-to-end communications may not exist. VDTN architecture handles non-real timeapplications using vehicles to relay messages between network nodes. To address the problem of intermittent connectivity, network nodes store messages on their buffers, carrying them through the network while waiting for transfer opportunities. The storage capacity of the nodes affects directly the network performance. Therefore, it is important to incorporate suitable network protocols using self-contained messages to improve communication that supports store-carry-and-forward operation procedures. Clearly, such procedures motivate content cachingand retrieval. This paper surveys the state-of-the art on intelligent caching and retrieval mechanisms focusing on ad-hoc and delay tolerant networks (DTN). These approaches can offer important insights for upcoming proposals on intelligent caching and retrieval mechanisms for VDTNs.

scholarly journals Distributed Misbehavior Detection Scheme for Delay Tolerant Networks

2019 ◽  
Vol 8 (9S3) ◽  
pp. 1288-1292
Keyword(s):  
Network Performance ◽  
Detection System ◽  
Delay Tolerant Networks ◽  
Secure Routing ◽  
Security Model ◽  
Detection Scheme ◽  
Misbehavior Detection ◽  
Distributed Approach ◽  
Intermittent Connectivity ◽  
Delay Tolerant

Opportunistic forwarding mechanism in Delay Tolerant Networks (DTN), are prone to get disconnected from the nodes in the network. These types of networks deal with intermittent connectivity, large delays.Existing routing protocols of DTNs fights with these issues, but fail to integrate the security available for delay tolerant networks,it is necessary to design a secure routing protocol to overcome these issues. There are centralized Trust Authority (TA) based security systems but the disconnection or failure of TA, affects the security model and network performance. It becomes crucial to have the distributed approach for security system and have multiple TAs working on security model. This reduces the possibility of poor network performance. The paper presents a distributed misbehavior detection system, and implements multiple TAs for implementing the security model for DTN.

Sign in / Sign up

Export Citation Format

Share Document