wireless networks in range but cannot connect

... MN not getting involved in mobility-related signaling That is, the binding update delay is shorter in PMIPv6 since it is carried out by a MAG (which is in the network infrastructure) instead of ... packet loss while maintaining minimal signaling overhead in the air interface among converged heterogeneous wireless networks Simulation and analytical results show that indeed handover delay ... by further reducing the handover delay and packet loss while maintaining minimal signaling overhead This paper focuses on improving the handover performance in micromobility domains because user

Ngày tải lên: 21/06/2014, 17:20

... Engineering Blekinge Institute of Technology SWEDEN Trang 6© 2006 Stefan ChevulDepartment of Telecommunication Systems School of Engineering Publisher: Blekinge Institute of Technology Printed ... Trang 1Blekinge Institute of Technology Licentiate Dissertation Series No 2006:11 School of EngineeringON APPLICATION-PERCEIVED QUALITY OF SERVICE IN WIRELESS NETWORKS Stefan Chevul Wireless and ... developed in Europe provides date rates of up to 2 Mbps Another important technology in the evolution of wireless networks isthe Wireless Local Area Networks (WLANs) In the early days of WLANsindustry-specific

Ngày tải lên: 18/10/2013, 12:15

... receives the RREP, it inserts the routing information aboutD into its routing table and uses this routing information to send data toD. Instead of blindly searching for the route in the entire network, ... Self-Adaptive Routing Algorithm for Wireless Sensor Networks in Home Automation Xiao Hui Li,1Seung Ho Hong,2and Kang Ling Fang1 1 College of Information Science and Engineering, Engineering Research ... routing algorithm that can meet WSNHA requirements while minimizing the routing overhead 4 Routing Algorithm In AODVjr routing, when a source nodeS has data to send to a destination nodeD but

Ngày tải lên: 21/06/2014, 05:20

... implementation 4.4 Training Algorithm The classification process basically consists of two phases: training phase and testing phase A training set is used in supervised training to present the proper ... allows speeding its learning process and reducing its size Among several possible features selection algorithms, we will investigate principal component analysis (PCA) and linear discriminate analysis ... PCA (since it deals directly with class separation), empirical evidence suggests otherwise [31] For instance, LDA will fail when the discriminatory information is not in the mean but rather in the

Ngày tải lên: 21/06/2014, 16:20

... and intuitive to cache streaming data on the way. Many works have been done to exploit the caching benefits in multihop wireless networks [8–10]. In the caching-enhanced multihop wireless networks, ... uniform cardinality distribution. It remains to show how a uniform distribution can be achieved and maintained in this dynam- ically evolving system. At first, we need to initial the caching system ... effectively. Finally, we apply the C 3 in the caching management of streaming data in multihop wireless networks. 7. Conclusion and Future Work In this paper, we introduced a novel solution for caching

Ngày tải lên: 21/06/2014, 17:20

... communications in future-generation wireless networks Norman Abramson1, Claudio Sacchi2, Boris Bellalta*3 and Alexey Vinel4 1 Department of Electrical Engineering, University of Hawaii, USA 2 Information ... allocated [6] in the USA ALOHA channels were used in a limited way in the 1980s in 1G mobile phones for signaling and control purposes [7] In the 1990s, Matti Makkonen and others at Telecom Finland ... scheme enables fair and efficient wireless access in challenging interference scenarios, for example, multiple networks deployed in the same geographical area and sharing a common band Trang 9The

Ngày tải lên: 21/06/2014, 17:20

... of the time windows consists of two operations: expanding, that is, increasing the window size by one time point, and shrinking, that is, decreasing the window size by one time point The collector ... adap-tively adjust the time windows by applying the reinforcement learning mechanism from the beginning of the whole procedure Reinforcement learning is a machine learning technique that deals with ... develop WINTER (WINdow adjusTment with Expanding and shRinking) algorithm, which can perform adaptive adjustment during runtime and improve the prediction accuracy by using the reinforcement learning

Ngày tải lên: 21/06/2014, 18:20

... in Wireless Networks Jen-Yi Pan, 1 Min-Chin Chen, 1 Ping-Cheng Lin, 1, 2 and Kuo-Lun Lu 1 1 Department of Communications Engineering, National Chung Cheng University, 168 University Road, Min-Hsiung, ... one interface card to connect to different wireless networks. Since the MN has many available network interfaces, the link between the CN and MN has many independent transmission paths (multihoming). ... simulation by using ns-2.29 and SCTP modules [17]. 5.1. Packet Loss Model for Wireless. Packet losses in wireless networks often result from a user moving out of range of the signal, interference

Ngày tải lên: 21/06/2014, 18:20

... RTTminupdating algorithm, in which RTTmin is multiplied by a reducing factor less than one However, since the RTTmin updating algorithm is invoked whenever a congestion event occurs, RTTmin goes ... TCP in wireless networks In this paper, we refer to these sort of schemes to improve the TCP performance against wireless losses as wireless TCP as a whole Wireless TCP can be classified into ... congestion in a distributed manner However, it is reported that TCP suffers from severe performance degradation in wireless networks [3] TCP was originally designed for the use in the wired networks

Ngày tải lên: 21/06/2014, 20:20

... sets of independent Λ time intervals were generated In case of overlapping transmission intervals from different nodes, only the first transmission interval in the overlapping group contributes ... fair throughput share can be maintained in a single-hop network IEEE 802.11 also maintains fairness which is preserved in a single hop network 5.1.2 Channel Prediction Inaccuracy As we discussed ... paradigm, called Channel MAC in [11], which exploits the random nature of the fading channel to determine the channel access instances in a decentralised and distributed manner In contrast to [6], where

Ngày tải lên: 21/06/2014, 22:20

... accurately determining its position. The main contributions of our work can be briefly described through the following points. (1) The physical layer preprocessor, aiming at gathering intrinsic features ... proposed techniques. Finally, Section 9 concludes the paper. 2. Intrusion Detection in Wireless Networks This section examines the state of intrusion detection in wireless networks, with a particular ... anomaly detection in wireless networks,” in Handbook of Research on Wireless. .. USA, February 2005 [9] C Valli, “WITS: wireless intrusion tracking system,” in Proceedings of the 3rd

Ngày tải lên: 21/06/2014, 22:20

... transmitted during that time as shown inFigure 6 Since in practical scenarios the interference probability q i  1, the probability of having two interfering packets arriving during the packet ... 802.16a networks In all of the mentioned previous works, since the power level of the coexisting networks is comparable, then both can benefit from interference avoidance via using spectrum sharing ... also investigated how the parameter describing the geometric model varies over time by running a sliding window over data and calculating the best parameter of the underlying geometric distribution

Ngày tải lên: 21/06/2014, 22:20

... maximum flow problem in lossy networks 3.2 A Game Theoretic Interpretation In this subsection, to gain a more in-depth insight of the internal structure of the obtained multipath routing solution, we ... for wireless networks where packet loss and link instability is one of the major concerns Thirdly, since finding the maximum flow in lossy networks is by nature much more complex to solve than in ... tuning the parameter 3.4 Discussion The multipath routing problem investigated in this section is related to the work of inspection point deployment in [16] and intrusion detection via sampling

Ngày tải lên: 21/06/2014, 23:20

... transmitter’s coor-dinatesp as the weighted centroid of all receiver coordinates p i, as defined for WCL in (2), but with a linearly increasing weight assigned to each receiver according to its presumed ... Krizanc, and P Morin, “Improv-ing distance based geographic location techniques in sensor networks,” in Proceedings of the 3rd International Conference on Ad-Hoc, Mobile, and Wireless Networks (ADHOC-NOW ... The receiver coordinates may be weighted linearly or exponentially Definition 4.1 (minimal/maximal RSS) LetRbe the set of all receivers within range of a given messageMT originating from an uncooperative

Ngày tải lên: 21/06/2014, 23:20

... the STAs In particular, in multicell WLANs the APs communicate through their wired connections and in wireless mesh networks the APs use the wireless backhaul to communicate Especially in wireless ... gains in performance as compared to other schemes The main reason for this improvement is that in our framework we avoid unavailing channel scanning Besides, the information sharing that is introduced ... sequential channel scanning and AP probing The main outcome of our framework is that it Trang 2eliminates the delays that are introduced in the systemduring the 802.11-based scanning/probe phases Therefore,

Ngày tải lên: 21/06/2014, 23:20

... Casares-Giner, “Optimal admission control using handover prediction in mobile cellular networks,” in Proceedings of the 2nd Interna-tional Working Conference on Performance Modelling and Eval-uation ... is a combination of the numbers of users in each class that can be supported simultaneously in the group of colocated cells while maintaining adequate QoS and meet-ing resource constraints The ... call into RAT- j without adapting the bandwidth of ongoing call(s) in the RAT, in which case the states evolves. Trang 7(3) Admit the class-i call into RAT- j after adapting thebandwidth of ongoing

Ngày tải lên: 22/06/2014, 19:20

... Research Chair in Advanced Telecommunications Engineering in the Department of Electrical and Computer Engineering His research interests are in mobile systems and wireless networks He is ... the Ph.D degree in industrial engineering (with applications to wireless networks) from the Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea, in 1995, 1997,... ... satisfying a minimum rate con- straint for each user. The problem was formulated as an in- teger programming problem and a continuous-relaxation- based suboptimal solution method was studied. In

Ngày tải lên: 22/06/2014, 22:20

... or indoor cells, resulting in different quality of the mobile coverage inside the different buildings. 5 284 23-3026 Uen Rev B 2.2 Coverage using Dedicated In- Building RBS In- building ... satisfactory in- building coverage, but in other cases it is far from acceptable. Thick walls, metal-coated windows and other obstacles often hinder radio waves from penetrating inside buildings. ... believed to increase the need for in- building solutions. It can also be assumed that in most cases mobile Internet users will be sitting comfortably inside buildings, rather than walking around...

Ngày tải lên: 27/01/2014, 15:20

... the interstate highway I-26 (Columbia, South Carolina) with two cars running in par- allel at speeds exceeding 110 km/h. 4.2 Eavesdropping Range We measured the eavesdropping range in both indoor ... (2008), 3187–3199. 16 Eavesdropping range Indoor noise floor Outdoor noise floor Boosted range Amplified noise floor Original noise floor Original range (a) indoor vs. outdoor (w/o LNA) (b) with LNA vs. without LNA (indoor) Figure ... risks in wireless hotspot networks. In Security in Pervasive Computing, First International Conference (2003), pp. 10–24. [20] GRU T ESE R , M., A N D GRU NWAL D, D. Enhancing loca- tion privacy in...

Ngày tải lên: 23/03/2014, 10:20

... dissolving the resin covering the silicon using fuming acid. The next step involves layout reconstruction using a systema- tic combination of microscopy and invasive removal of covering layers. During layout ... routing mes- sages and advertize non-existent links, provide incorrect link state information and flood other nodes with routing traffic, thus inflicting Byzantine failures on the system. The wireless ... metric information can be inserted into legitimate protocol packets by malicious insider nodes. 3.6 Attacks against routing or network layer Attacks against routing are basically of two types: internal...

Ngày tải lên: 25/03/2014, 12:07