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Network operators have a keen interest on knowledge about the coverage of their network in indoor environments. Mobile users use the mobile network indoors about 80% of their time compared to outdoor. To identify coverage gaps it requires precise knowledge about the environment itself and the whereabout of the mobile terminal. This knowledge is lacking for two reasons. First the network driven time-based...
The indoor environment offers different constrains that stimulate cooperative methods to improve positioning accuracy. An important constraint indoors is the high density of potentially cooperating devices compared to outdoors. Indoor could also make use of outdoor positioned mobile nodes by using or exploiting peer-2-peer (P2P) connectivity. The P2P connectivity indoors only supports the ubiquitous...
Based on dynamic multicast agent, a novel mobile multicast protocol, named TD-DMAMoM (time and distance-aided dynamic multicast agent-based mobile multicast protocol) is presented. In TD-DMAMoM, a fast multicast handover mechanism is used to decrease the multicast interruption time when the mobile node (MN) moves from one foreign network to another. Meanwhile, the proposed protocol tries to provide...
This paper presents a network-assisted mobility support scheme for 6L0WPAN nodes, which enables multi-hop communication between the Gateway (GW) and the mobile 6L0WPAN devices (MNs), with minimum mobility related signaling at the MN's end as compared to conventional mobility related protocols like MIPv6. The scheme provides mobility support to the MNs with the help of low cost static 6L0WPAN devices...
In this paper we have presented a physical implementation of a topology control algorithm for MANETs. Mobile nodes follow the characteristics of the nomadic community mobility model. The proposed algorithm maintains the topology without any control message. There is no need to change routing table as connectivity of the network is maintained all through. Every node in the network is free to travel...
An interesting approach for the location service problem in wireless mesh networks is the one that relies on location agendas to model node displacements on an absolute time basis. To the best of our knowledge, the literature still lacks the design and evaluation of such an approach. In this paper, we introduce and analyze an agenda-based location service that reduces the overhead due to location...
Hierarchical MIPv6 (HMIPv6) is proposed to improve the system performance of mobile IPv6 (MIPv6). However, HMIPv6 cannot outperform MIPv6 in all scenarios because of its double-registration when a user roams across regions and the longer packet delivery latency. Therefore, to select a proper mobility management scheme between MIPv6 and HMIPv6 becomes an interesting issue, for its potentials in enhancing...
The IETF is specifying mobility management protocols. Recently, proxy mobile IPv6 has been specified as a network-based localized mobility management protocol. Since the base specification of proxy mobile IPv6 does not cover the route optimization, many research papers have been suggested for route optimization in proxy mobile IPv6. However, most of suggestions are concentrated on the route optimization...
Seamless IP mobility protocols like Fast Mobile IPv6 (FMIPv6) requires the knowledge of candidate access routers, to which the mobile node will hand over its connection to, well in advance while the mobile node is still connected to its current AR. The candidate access router discovery (CARD) protocol is one such protocol that provides the identity and capabilities information of the candidate access...
Obstacles present in the line of sight transmission path of a wireless signal severely attenuates the received signal power. Extreme fluctuations of the received signal power caused by shadowing can create "blind spots". Blind spots are areas within the cellular coverage area from where no communication is possible to the base station (BS). For single path packet based services link failures...
As improvement of wireless and mobile technologies such as FMIPv6 and mSCTP, mobile devices such as laptops and PDAs are widely used. We investigate existing Mobile IPv6 scheme such as FMIPv6 in network layer and mSCTP in transport layer and find that both of them have some defects for signaling cost in mobile IPv6 environment. So, we we make a potential change to mSCTP - combine add-IP message with...
IEEE 802.16e standard is considered to be one of the most promising solutions for next generation broadband wireless networks. Still, handover latency in IEEE 802.16e networks is an important issue that affects real-time applications. In this paper, a cross-layer fast hierarchical handover mechanism (CLFH) for IEEE 802.16e networks is introduced. The handover procedure of IEEE 802.16e is integrated...
In this paper, a dynamic scan initiation scheme in a 802.16e network is proposed in order for a mobile station to avoid waste of resources while meeting given handover time. Using statistical analysis on the received signal strength, a mobile station can trigger a scanning process only when a handover is anticipated regardless of random errors in radio propagation environments.
The transmission energy required for a wireless communication increases superlinearly with the communication distance. In a mobile wireless network, nodal movement can be exploited to greatly reduce the energy required by postponing communication until the sender moves close to a target receiver, subject to application deadline constraints. In this paper, we characterize the fundamental performance...
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