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Delay-Tolerant Networks (DTNs) are a type of emerging networks characterized by very long delay paths and frequent network partitions. For the distinct characteristics of DTNs, routing becomes one of the most challenging open problems. Recent years numerous approaches have been presented for addressing routing issues in DTNs. This paper surveys main DTN routing strategies and gives a comparison of...
The correct functioning of inter-domain routing is of vital importance to the ever expanding Internet. As a common threat to the Internet, prefix hijackings often hijack traffic destined to some Autonomous Systems(ASes), leading to routing black holes or traffic interception. In this paper, we study two typical categories of prefix hijackings, namely false origin hijacking and man-in-the-middle interception,...
It is vital to find a path that satisfies multiple Quality-of-Service (QoS) constraints with the deployment of current emerged services. However, it is not very efficient and effective at finding such a path for existing algorithms. In this paper, an improved version of fully polynomial time approximation scheme (IFPTAS) for multiple constraints path optimal (MCOP) problem was proposed. We find that...
In VANETs, the carry-and-forward strategy had been adopted to overcome uneven distribution of vehicles. If next vehicle located in the transmission range, the vehicle forwards packets; otherwise carries packets until meeting. The carry is almost occurring in sparse traffic road segment, and long carry distance has long end-to-end packet delay. Likewise the dense condition also could have long delay,...
We present a multi-layer protocol based on power control and virtual Multi-Input Single-Output (VMISO). Specifically, we discuss the influence of rate, cluster size, and transmission range of the VMISO link on the whole performance improvements, where the key physical layer property that we focus on is an enlarged transmission range due to cooperative diversity. Further, the new protocol, termed the...
Performance of workflow schema including overlapping patterns can not be computed by regular reducing approaches, and that excluding overlapping patterns from workflow schema will lose flexibility in schema design, introduce redundant nodes, and make it difficult to describe complex business process. To solve this problem, the concept of generalized well-formed workflow was proposed, in which overlapping...
This paper addresses dynamic restoration to the scenario of single link failure for survivable traffic grooming in WDM mesh networks. Two restoration schemes are proposed, dynamic restoration at connection granularity (DRAC) and dynamic restoration at lightpath granularity (DRAL). DRAC routes a failed connection to a new multihop path, while DRAL routes a failed lightpath to a new lightpath or other...
To solve the non-transitive connectivity (NTC) problem which existing widely in networks, this paper proposes a method to solve the NTC problem in overlay network by using uncertainty DHT to establish structured network. Through relieving the relationship between node ID of bottom layer and position of logical space, it will avoid the effect of NTC node to network structure, at the same time using...
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