Analysis and Optimization of Mobile IPv6 Handoff Technology

2013 ◽  
Vol 798-799 ◽  
pp. 489-492
Author(s):  
Xi Yi Zhou ◽  
Yun Ke ◽  
Ge Zhang
Keyword(s):  
Service Quality ◽  
Network Performance ◽  
Mobile Ipv6 ◽  
Drop Out ◽  
Node Mobility ◽  
Hierarchical Mobile Ipv6 ◽  
Advantages And Disadvantages ◽  
Handoff Delay ◽  
Simulation Results ◽  
Packet Drop

Mobile IPv6 solves the problem of node mobility though the protocol handoff process requires high cost and affects service quality. Currently, mobile IPv6 fast mobility and hierarchical mobility handoff technology enjoy wide applications, but there are still weaknesses. In view of the advantages and disadvantages of these two technologies, this paper puts forward a new fast hierarchical handoff scheme of mobile IPv6. Simulation results show that the handoff delay of fast hierarchical mobile IPv6 is shorter than that of fast mobile IPv6 and hierarchical mobile IPv6, which can reduce data packet drop-out and improve network performance.

Hierarchical Mobile IPv6 Based Handoff Optimization Scheme

2013 ◽  
Vol 798-799 ◽  
pp. 460-463
Author(s):  
Xi Yi Zhou ◽  
Ge Zhang ◽  
Li Qiang Liu
Keyword(s):  
Loss Rate ◽  
Mobile Ipv6 ◽  
Optimization Scheme ◽  
Simulation Experiments ◽  
Hierarchical Mobile Ipv6 ◽  
Tunneling Mechanism ◽  
Handoff Delay ◽  
Update Process ◽  
Local Binding ◽  
Binding Update

Hierarchical mobile IPv6 fastens the binding update process of micro mobile handoff and reduces handoff delay. A large number of binding updates and registrations increase signaling load and lengthen handoff delay. For this reason, it is proposed to apply tunneling mechanism to hierarchical mobile IPv6 optimization scheme (T-HMIPv6) to obtain care-of address in advance based on handoff information, conduct duplicate address detection, and complete local binding update while building a tunnel. Simulation experiments show that compared with hierarchical mobile IPv6, this scheme can greatly reduce handoff delay and packet loss rate and effectively improve mobile node's macro handoff performance.

Estimating Pedestrian Impact on Coordination of Urban Corridors

2019 ◽  
Vol 2673 (7) ◽  
pp. 265-280 ◽  
Author(s):  
Sharmin-E-Shams Chowdhury ◽  
Aleksandar Stevanovic ◽  
Nikola Mitrovic
Keyword(s):  
Cycle Length ◽  
Network Performance ◽  
Traffic Signals ◽  
High Fidelity ◽  
Vehicular Traffic ◽  
Traffic Demand ◽  
Advantages And Disadvantages ◽  
Street Traffic ◽  
Pedestrian Impact ◽  
Signal Operations

Pedestrian walk timings at most U.S. traffic signals are run in concurrence with relevant signal phases for vehicular traffic. This usually means that signal operations coordinated for the major street can be interrupted by a pedestrian call. Such an interruption may in practice last for a few minutes, thus causing increased delays and stops for major traffic flows. An alternative to this design is to increase the cycle length and embed pedestrian timings within the ring-barrier structure of the prevailing coordination plan. Both approaches have advantages and disadvantages. A fresh approach offered by this study is a comprehensive experimental design and holistic performance evaluation perspectives. The study examines the two abovementioned treatments of pedestrian timings for a small corridor of five intersections in Utah. The experiments have been done in a high-fidelity microsimulation environment with the Software-in-the-Loop version of the field controller (Econolite ASC/3). Findings show that either approach works well for very low traffic demands. When the traffic demand increases findings cannot be generalized as they differ for major coordinated movements versus overall network performance. While major-street traffic prefers no interruption of the coordinated operations, the overall network performance is better in the other case. This can be explained by the fact that avoiding interruptions is usually achieved at the expense of longer cycle length, which increases delay for everyone in the network.

scholarly journals MedShard: Electronic Health Record Sharing Using Blockchain Sharding

2021 ◽  
Vol 13 (11) ◽  
pp. 5889
Author(s):  
Faiza Hashim ◽  
Khaled Shuaib ◽  
Farag Sallabi
Keyword(s):  
Healthcare System ◽  
Small Groups ◽  
Network Performance ◽  
Communication Overhead ◽  
Privacy And Security ◽  
Health Records ◽  
Medical Practitioners ◽  
Blockchain Technology ◽  
Simulation Results ◽  
Electronic Health

Electronic health records (EHRs) are important assets of the healthcare system and should be shared among medical practitioners to improve the accuracy and efficiency of diagnosis. Blockchain technology has been investigated and adopted in healthcare as a solution for EHR sharing while preserving privacy and security. Blockchain can revolutionize the healthcare system by providing a decentralized, distributed, immutable, and secure architecture. However, scalability has always been a bottleneck in blockchain networks due to the consensus mechanism and ledger replication to all network participants. Sharding helps address this issue by artificially partitioning the network into small groups termed shards and processing transactions parallelly while running consensus within each shard with a subset of blockchain nodes. Although this technique helps resolve issues related to scalability, cross-shard communication overhead can degrade network performance. This study proposes a transaction-based sharding technique wherein shards are formed on the basis of a patient’s previously visited health entities. Simulation results show that the proposed technique outperforms standard-based healthcare blockchain techniques in terms of the number of appointments processed, consensus latency, and throughput. The proposed technique eliminates cross-shard communication by forming complete shards based on “the need to participate” nodes per patient.

Attendance at a psychiatric day centre

1994 ◽  
Vol 11 (4) ◽  
pp. 180-182
Author(s):  
Gerry Lynch ◽  
Margaret McKee ◽  
Daniel M Brennan
Keyword(s):  
Service Quality ◽  
Psychotic Disorders ◽  
Drop Out ◽  
Satisfaction Survey ◽  
First Year ◽  
Service Utilisation ◽  
Diagnostic Data ◽  
Drop Out Rate ◽  
At Home

AbstractObjective: To examine the service utilisation of a newly opened psychiatric day centre. We wished to determine if different diagnostic groups had different perspectives of the day centre, and to see if the drop-out rate differed among clients with neurotic or psychotic disorders.Method: Demographic and diagnostic data was gathered for all clients referred in the first year of operation of the day centre. Those who defaulted from attendance were visited at home and asked to detail reasons for non-attendance. Those who continued to attend 16 months after the centre opened completed a satisfaction survey.Results: The drop-out rate was high for both clients with neurotic and psychotic disorders. Clients who continued to attend were very positive about the day centre. Both client groups saw the benefits of attendance in social rather than therapeutic terms.Conclusions: Consumer opinion may have a valuable part to play in overall measure,measurement of service quality, particularly if it includes the opinion of those who no longer use that service.

Research on Route Protocol and Architecture for WSN Based on IPv6

2012 ◽  
Vol 616-618 ◽  
pp. 2233-2238 ◽  
Author(s):  
Rui Ting Lu ◽  
Xiang Zhen Li ◽  
Jia Hui Wang ◽  
Feng Jie Sun
Keyword(s):  
Load Balancing ◽  
Routing Protocol ◽  
Network Performance ◽  
Experimental Result ◽  
Routing Overhead ◽  
On Demand ◽  
End To End Delay ◽  
Simulation Results ◽  
Demand Routing ◽  
Route Protocol

WSN based on IPv6 is a new network integrated IPv6 and WSN. The related technologies of WSN based on IPv6 was researched, and an architecture of WSN based on IPv6 was proposed according to 6LoWPAN protocol in this article. Efficient and stable route protocol is a main focus to ensure network performance. Refer to on-demand routing protocol DSR, a Load-Balancing route protocol for WSN based on IPv6 was designed. An implementation of this protocol was programmed in NS2, and its simulation results were analyzed. The experimental result shows that this protocol could effectively reduce end-to-end delay and routing overhead, improving the network performance.

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