Performance Analysis and Comparison of QoS Provisioning Mechanisms for CBR Traffic in Noisy IEEE e WLANs Environments
|
|
- Roland McCoy
- 8 years ago
- Views:
Transcription
1 Tamkang Journal of Scence and Engneerng, Vol. 12, No. 2, pp (2008) 143 Performance Analyss and Comparson of QoS Provsonng Mechansms for CBR Traffc n Nosy IEEE e WLANs Envronments Der-Junn Deng* and Yu-Fan Yeh Department of Computer Scence and Informaton Engneerng, Natonal Changhua Unversty of Educaton, Tachung, Tawan, R.O.C. Abstract In order to reach better Qualty-of-Servce (QoS) requrements for multmeda applcaton, the e task group was formed and has proposed EDCA (Enhanced Dstrbuted Channel Access) for contenton perod and HCCA (HCF Controlled Channel Access) for contenton-free perod n the HCF (Hybrd Coordnaton Functon) to enhance the orgnal IEEE Medum Access Control (MAC) protocol. However, the problem of choosng the rght set of MAC parameters and strct QoS mechansm to provde guaranteed QoS n IEEE e Wreless Local Area Networks (WLANs) remans unsolved. In ths paper, a pragmatc Call Admsson Control (CAC) scheme wth a novel pollng based uplnk schedulng polcy for CBR traffc n IEEE e WLANs s proposed. The proposed CAC scheme computes the expected delay varaton of every sesson upon arrval of new connecton for admsson decson. In addton, the proposed packet based delay constraned schedulng polcy can derve suffcent condtons such that all accepted sources satsfy ther tme constrants to provde determnstc QoS guarantees. In addton to theoretcal analyss, smulatons are conducted to evaluate the performance of the proposed scheme. As t turns out, our desgn works very well n provdng performance mprovement n the nosy IEEE e WLANs envronment. Key Words: Delay Varaton, EDCA, HCCA, CBR, IEEE e 1. Introducton In WLANs, the MAC protocol s the key component that provdes the effcency n sharng the common rado channel whle satsfyng the QoS requrements for realtme traffc. However, frames n Dstrbuted Coordnaton Functon (DCF), the basc access method n the IEEE MAC layer protocol [1], do not have prortes, and there s no other mechansm to enforce a guaranteed access delay bound. As a result, real-tme applcatons such as voce transmssons may suffer from unacceptable delay wth ths protocol. The alternate access mode of the IEEE MAC layer protocol, Pont Coordnaton Functon (PCF), offers a packet-swtched *Correspondng author. E-mal: djdeng@cc.ncue.edu.tw connecton-orented servce, whch s well suted for real-tme traffc. However, n order to poll the statons an Access Pont (AP) must mantan a pollng lst, whch s mplementaton dependent. What ths means s that endto-end QoS requrements stll cannot be satsfed n ths scheme snce t does not nclude any access control polcy. Snce the demand for the use of packet-swtched technques for transferrng delay-senstve data n wreless envronments s nevtable for multmeda applcatons, the IEEE workng group s currently workng on a new standard called e [2] to enhance the orgnal MAC sublayer to support applcatons wth QoS requrements. In order to reach better QoS requrements for real-tme applcaton, the e task group has proposed EDCA for contenton perod and HCCA for contenton-free perod n the HCF to enhance
2 144 Der-Junn Deng and Yu-Fan Yeh the orgnal IEEE MAC protocol. However, the problem of choosng the rght set of MAC parameters and strct QoS mechansm to provde guaranteed QoS n IEEE e Wreless LANs remans unsolved. Although n the lteratures there have been adequate excellent dscussons on the ssue of QoS and delay analyss n IEEE WLANs [36], none of the above studes proposed a complete soluton and performance evaluaton to fulfll a strct QoS guarantees for multmeda traffc n IEEE e WLANs. In paper [7], the authors proposed an adaptve EDCF scheme. One problem of the basc EDCA ad-hoc mode s that the sze of contenton wndow and backoff functon of each queue s statc and does not take nto account dynamcty of wreless channel condtons. In AEDCF, relatve prortes are provsoned by adjustng the sze of the contenton wndow of each traffc class takng nto account both applcaton requrements and network condtons. After each successful transmsson, AEDCF does not reset the contenton wndow sze. In paper [8], the authors ntroduced a per-flow dfferentaton scheme. All packets are put n the same queue, ndependent of ther prortes. However, ths scheme ntroduces mutual nterferences between prortes: when the AP serves a low prorty of slow flow, the global speed and effcency of AP depends on the occupaton tme of the slow flow. If most of the tme the flow occupes the AP, even f there are other hgh-prorty fast flows, hence, the AP has to be slow, and servce dfferentaton gets lower. Based on the above observatons, the need for provdng Qualty of Servce (QoS) for real-tme applcatons n e networks has been drvng research actvtes and standardzaton efforts for some tme. However, current research results offer some mechansms to provde basc levels of QoS dfferentaton to aggregate flows manly n the form of prorty servces. In addton, to the best of our knowledge, very lttle work has been dedcated to provdng per-sesson/per-packet QoS guarantees n WLANs, a necessary feature for most multmeda applcatons. In ths paper, a pragmatc CAC scheme wth a novel pollng based uplnk schedulng polcy for CBR traffc n IEEE e WLANs s proposed. Under such a scheme, the CBR sesson was characterzed by ts traffc rate and tolerable jtter. The proposed transmt-permsson polcy for HCCA access method can derve suffcent condtons such that all the CBR sources satsfy ther tme constrants to provde determnstc QoS guarantees. In addton to theoretcal analyss, smulatons are conducted to evaluate the performance of proposed scheme for CBR traffc. We also compared the proposed scheme wth the other two QoS provsonng mechansms wth respect to blockng rate, average access delay, and achevable throughput under dfferent offered traffc load. As t turns out, our desgn ndeed provdes good performance mprovements over the IEEE e standard. The remander of ths paper s organzed as follows. Secton II descrbes the proposed scheme n detal. Smulaton and expermental results are reported n Secton III. Secton IV concludes ths paper. 2. The Proposed Scheme In what follows, we present the proposed scheme n detal. Our method nvolves two basc components: (1) a call admsson control scheme for access decson; (2) a packet based delay constraned up-lnk schedulng polcy. 2.1 Call Admsson Control for Access Decson Upon arrval of a new user, the call admsson control unt decdes to grant or deny admsson permt. The decson s made based on the current nformaton of the system and the analytcal model for estmaton of expected delay varaton. If admsson of the new user does not degrade the achevable performance below ther requrement, the new user can be admtted nto the system. The CBR traffc s characterzed by two parameters (r, ), where r s the rate (number of packets per second) of the source and s the maxmum tolerable jtter (packet delay varaton) for ths sesson. Assume there are n CBR sources (ndexed by =1,2,,n). We denote (r, )as the traffc parameters of the th CBR source. In the followng theorem, we provde suffcent condtons for all the CBR packets to satsfy ther maxmum jtter constrants. Theorem: Defne * to be the parameter calculated by CAC unt. The CAC unt uses ths parameter to decde whether the AP accepts a CBR connecton or not. Let * = t PIFS + 1 rk t p + tp k r, =1,2,,n and t PIFS be the duraton 1 of PCF nterframe space, and t p be the tme to transmt a
3 QoS Mechansms for CBR Traffc n WLANs 145 packet. If *<1/r and for all =1,2,,n, then all the packets generated by the th CBR source meet ther jtter constrants. Proof: Suppose that the frst token generated from the th CBR source has a maxmum watng tme. We want to prove that for 1 n. Consderng the frst CBR source,.e., = 1, ts maxmum watng tme s for the channel to be cleared snce we assume a nonpreemptve prorty. The channel wll be cleared wthn a packet transmsson tme t p. Thus, 1 t PIFS + t p = * 1. Snce * 1 1 r and * (by our 1 1 assumpton), we have 1 1 1, whch establshes the nducton bass. Suppose our nducton hypotheses holds up to the (-1) st CBR sources,.e., j for 1 j 1. Now we consder the th CBR source. Let the arrval nstant of a pollng token as tme 0. Suppose *. Then t means that up to tme * the channel must be servng all the CBR sources from 1 to 1. Snce the total amount of packets that can be served wthn (0, * ) for these 1 1 * voce sources s at most tpifs rk k1. Addng t p for nonpreemptve prorty, hence, the total amount of tme to serve these packets s bounded above by t PIFS + 1 ( * r 1 ) t k1 k p, and snce we assume * 1,we r 1 1 * have tpifs ( rk 1) t p < t PIFS + ( rk ) r k1 k 1 1 t p = *. Thus, the channel cannot be busy all the tme n (0, * ) and ths contradcts our assumpton. Ths shows * Hence,. Based on the prncple of nducton, the statement of the theorem follows. Q.E.D. Snce the proposed packet based delay constraned schedulng polcy can derve suffcent condtons such that all accepted sources satsfy ther tme constrants to provde determnstc QoS guarantees, all admtted CBR sources are starvaton-free. However, as the numbers of CBR connectons ncreases, they tend to grab the channel. Hence, from the performance vewpont, t s equally mportant to guarantee a mnmum bandwdth for data traffc n order to mantan a reasonable bandwdth usage. To acheve ths goal, we can leave a mnmum bandwdth for data traffc smply by changng the value of t p (the total tme of transmts a CBR packet n a contenton free perod) to keep data traffc from starvaton. Fnally, we stll need to analyze the complexty of the proposed theorem. In the worst case, the call admsson control unt makes n-1 comparsons before makng the decson, and each comparson take n steps calculatons. Hence, ts complexty s O(n 2 ). 2.2 Packet Transmt Permsson Polcy In what follows, we propose a delay constraned schedulng scheme for HCCA access method n contenton-free perod to support CBR sessons. In one Basc Servce Set (BSS) of IEEE e nfrastructure network archtecture, the AP mplements a token bucket for each CBR source. In token buckets for CBR sources, the one wth the smallest tolerable jtter constrant has the hghest prorty among all CBR sources. For each CBR source, ts pollng token s generated every 1/r second n the AP. In order to gan control of the medum, the AP performs the functon of the pont coordnator by transmttng a beacon frame at the begnnng of the CFP after sensng the medum to be dle for a PIFS perod. Once the AP has the control of the medum, t performs the followng algorthm. Functon Packet_Transmt Polcy repeat scan the token buffer of CBR sources f a token found n CBR source then Transmts a CFP_Start Beacon after a PIFS perod remove one token from ths token bucket poll correspondng CBR source and transmt one packet f not the last packet then generate next token after (1/r)-tp sec else remove ths token bucket else scan the next token bucket untl no token bucket found n token buffer Transmts a CFP_End Beacon end. As the pseudo code llustrates, AP scans the token buffers of CBR sources accordng to the preset prorty order. If a token s found, t removes one from ths token buffer and polls ths CBR termnal. On recevng a poll
4 146 Der-Junn Deng and Yu-Fan Yeh the Staton transmts ts packet, and the AP wll generate the next token for ths CBR after 1 t r p second f t s not the last packet. When an end-of-fle sgnal s receved, the BS wll remove ths token bucket from token buffer. If there s no token found n all token buffers, the AP wll not know whch, f any, of the statons have real-tme packets to transmt, then, t can end the CFP by transmttng a CF-End frame, and, for assurng the tme constrant of admtted real-tme traffc, the AP shall announce the begnnng of the next CFP nterval by observng the token buffer constantly. 3. Performance Evaluaton Our smulaton model s bult usng the network smulator NS2 [9]. The model represents a BSS n the IEEE b standard WLANs wth all statons n the BSS (Basc Servce Set) capable of drectly communcatng wth the remanng partes. Fgure 1 shows an overvew of the smulated system topology. In our smulatons envronments, the ns wreless lnk s extended to generate an error probablty by employs the Glbert-Ellot (GE) error model [10] to characterze fadng n the communcaton channel. The rate at whch errors occur n the GE model s dependent on the channel condton. As llustrated n Fgure 2, n the good state, G, losses occur wth a low probablty, P G, whereas n the bad state, B, the channel operates n a fadng condton and the loss probablty, P B, s correspondngly hgher. Steady state probabltes of beng n states G and B are gven by G = P BG =(P GB + P BG ) and B = P GB =(P GB + P BG ), respectvely. The average packet loss rate produced by the GE channel s P = P GG + P BB. To focus on the access control ssue and to reduce the complexty of the smulaton, what follows are the basc assumptons n our smulaton envronment. Frst, the hdden termnal and the exposed termnal problems are not addressed n the smulaton model. Second, no statons operate n the power-savng mode. Thrd, no nterference s consdered from nearby BSSs. Fourth, transmsson errors are generated accordng to the Gaussan channel assumpton. Fnally, the transmtted propagaton delay s 1 s. The evaluaton s made wth respect to the frame blockng rate, average access delay, and Fgure 2. State transton dagram for the Glbert-Ellott model. Fgure 1. Smulaton topology.
5 QoS Mechansms for CBR Traffc n WLANs 147 achevable throughput under dfferent offered traffc load. We also compared the proposed scheme wth the other two QoS provsonng mechansms [7, 8]. CBR applcatons are used as traffc generators. The default values used n the smulaton are lsted n Table 1. The values for the smulaton parameters are chosen carefully n order to closely reflect the realstc scenaros as well as to make the smulaton feasble and reasonable. All the smulatons are conducted on FreeBSD 6.0 on a Xeon 3.4 GHz Server wth 2 GB memory. The verson of NS2 s ns-2.29, and each smulaton run lasts for 100 smulaton seconds. Smulaton results are shown below n the form of plots. Fgure 3 depcts the frame blockng rate as the traffc load ncreases. Snce we allow the admtted CBR sources to use bandwdth exclusvely wth prorty over other traffc, the blockng rate of the proposed scheme wll be kept lower than the legacy IEEE e protocol, besdes, the proposed scheme outperforms the other two schemes n most cases. Fgure 4 compares the average access delays of CBR traffc from the proposed scheme wth the legacy IEEE e protocol and the other two schemes. If the request s successfully receved and scheduled by the AP, the CBR connecton may transmt ts packet by usng HCCA access mode n contenton free perod when t s polled by the AP. Otherwse, t can stll transmt ts packet by usng EDCA access mode n contenton perod. We can see that although there s not much dfference n the values of the performance measures when load s lght, however, the proposed scheme provdes sgnfcantly better performance at heavy load. Fgure 5 depcts the achevable throughput as the traffc load ncrease n nosy envronments. As shown n the fgures, the throughput mprovement can be as much as about 20% n congested wreless envronments. It reveals that our proposed scheme could reduce the droppng probablty wthout sacrfcng the overall system performance. Fgure 6 show the BER performance and the traffc load versus the achevable throughput for the proposed scheme. As shown n the fgure, t can be seen that the throughput of our proposed scheme s not affected by Fgure 3. Blockng rate versus traffc load n nosy envronments. Table 1. Default attrbute values used n the smulaton Attrbute Value Meanng & Explanaton R DATA 11 Mb/s Maxmum data rate (WaveLAN DSSS) T slot 20 us Tme needed for each tme slot T SIFS 10 us Duraton of short nterframe space (SIFS) T DIFS 50 us Duraton of DCF nterframe space (DIFS) L DATA 1000 bytes Mean payload sze L ACK 112bts Ackframesze L H _ DATA 224 bts MAC overhead T P 25 us Duraton of a PLCP preamble T H 04 us Duraton of a PLCP header 01 us Propagaton Delay W 31 slots Mnmum contenton wndow sze m 5 Maxmum backoff stages d 250 meters Smulaton topology 250 m 250 m r 10~100 Kb/s CBR set rate (corresponds to nterval of 3.75 ms) L 210 bytes CBR packet sze
6 148 Der-Junn Deng and Yu-Fan Yeh Fgure 6. Throughput versus channel BER and traffc load. Fgure 4. Average access delay versus traffc load n nosy envronments. Fgure 7. Farness ndex versus channel BER and traffc load. Fgure 5. Achevable throughput versus traffc load n nosy envronments. channel BER between 10-8 to Besdes, the throughput of our proposed scheme changes lttle as the traffc load vares. Ths ndcates that the proposed scheme s qute resstant towards nfluences form wreless envronments. In Fgure 7, we nvestgate and analyze the farness of the proposed scheme. We use the farness ndex defned by Jan [11] to evaluate how far t s. The farness ndex s defned as where n s the number of connectons, and T s the throughput of connecton. From Cauchy-Schwartz nequalty, we obtan Farness Index 1, and the equalty holds f and only f all T are equal. As shown n the fgure, as the number of connectons and channel BER ncreases, the dfference of throughput also ncreases. 4. Concluson Currently, many wreless applcatons and devces are emergng, and ths trend s expected to contnue n the foreseeable future. Many problems reman further ntensve nvestgaton and need to be solved. In ths paper we have propose a pragmatc CAC scheme wth a novel pollng based uplnk schedulng polcy for CBR traffc n
7 QoS Mechansms for CBR Traffc n WLANs 149 IEEE e WLANs, offerng easly mplemented and yet flexble crtera for traffc prortzaton n a wreless envronment. The schedulng algorthm for CBR traffc s performed at each AP n a dstrbuted manner. Through extensve smulatons, we have demonstrated a satsfactory performance of our proposed scheme n a quanttatve way. It shows that the proposed scheme has proven t satsfactory superorty n most cases. References [1] Wreless Medum Access Control and Physcal Layer WG, IEEE Draft Standard P802.11, Wreless LAN, IEEE Stds. Dept, D3, Jan. (1996). [2] IEEE Draft Std e/D8.0, Medum Access Control (MAC) Qualty of Servce (QoS) Enhancements, Feb. (2004). [3] Wu, H. K. and Chuang, P. H., Dynamc QoS Allocaton for Multmeda Ad Hoc Wreless Networks, Moble Networks and Applcatons., Vol. 6, pp (2001). [4] Sobrnho, J. L. and Krshnakumar, A. S., Qualty-of- Servce n Ad Hoc Carrer Sense Multple Access Wreless Networks, IEEE Journal on Selected Areas of Communcatons., Vol. 17, pp (1999). [5] Yen, J. Y. and Chen, C. H., Support of Multmeda Servces wth the IEEE MAC Protocol, Proc. ICC., Vol. 1, pp (2002). [6] Coutras, C., Gupta, S. and Shroff, N. B., Schedulng of Real-Tme Traffc n IEEE Wreless LANs, Wreless Networks., Vol. 6, pp (2000). [7] Romdhan, L., N, Q. and Turlett, T., Adaptve EDCF: Enhanced Servce Dfferentaton for IEEE Wreless Ad Hoc Networks, Proc. WCNC., Vol. 2, pp (2003). [8] Aad, I. and Castellucca, C., Remarks on Per-Flow Dfferentaton n IEEE , Proc. EW., pp. 16 (2002). [9] The Network Smulator, ns-2, [10] Glbert, E. N., Capacty of a Burst-Nose Channel, Bell System Techncal., Vol. 69, pp (1960). [11] Jan, R., Durres, A. and Babc, G., Throughput Farness Index: An Explanaton, Proc. ATM Forum/ , Feb. (1999). Manuscrpt Receved: Nov. 21, 2007 Accepted: Jun. 27, 2008
MAC Layer Service Time Distribution of a Fixed Priority Real Time Scheduler over 802.11
Internatonal Journal of Software Engneerng and Its Applcatons Vol., No., Aprl, 008 MAC Layer Servce Tme Dstrbuton of a Fxed Prorty Real Tme Scheduler over 80. Inès El Korb Ecole Natonale des Scences de
More informationINVESTIGATION OF VEHICULAR USERS FAIRNESS IN CDMA-HDR NETWORKS
21 22 September 2007, BULGARIA 119 Proceedngs of the Internatonal Conference on Informaton Technologes (InfoTech-2007) 21 st 22 nd September 2007, Bulgara vol. 2 INVESTIGATION OF VEHICULAR USERS FAIRNESS
More informationPAS: A Packet Accounting System to Limit the Effects of DoS & DDoS. Debish Fesehaye & Klara Naherstedt University of Illinois-Urbana Champaign
PAS: A Packet Accountng System to Lmt the Effects of DoS & DDoS Debsh Fesehaye & Klara Naherstedt Unversty of Illnos-Urbana Champagn DoS and DDoS DDoS attacks are ncreasng threats to our dgtal world. Exstng
More informationivoip: an Intelligent Bandwidth Management Scheme for VoIP in WLANs
VoIP: an Intellgent Bandwdth Management Scheme for VoIP n WLANs Zhenhu Yuan and Gabrel-Mro Muntean Abstract Voce over Internet Protocol (VoIP) has been wdely used by many moble consumer devces n IEEE 802.11
More informationPerformance Analysis of Energy Consumption of Smartphone Running Mobile Hotspot Application
Internatonal Journal of mart Grd and lean Energy Performance Analyss of Energy onsumpton of martphone Runnng Moble Hotspot Applcaton Yun on hung a chool of Electronc Engneerng, oongsl Unversty, 511 angdo-dong,
More informationModule 2 LOSSLESS IMAGE COMPRESSION SYSTEMS. Version 2 ECE IIT, Kharagpur
Module LOSSLESS IMAGE COMPRESSION SYSTEMS Lesson 3 Lossless Compresson: Huffman Codng Instructonal Objectves At the end of ths lesson, the students should be able to:. Defne and measure source entropy..
More informationEfficient Bandwidth Management in Broadband Wireless Access Systems Using CAC-based Dynamic Pricing
Effcent Bandwdth Management n Broadband Wreless Access Systems Usng CAC-based Dynamc Prcng Bader Al-Manthar, Ndal Nasser 2, Najah Abu Al 3, Hossam Hassanen Telecommuncatons Research Laboratory School of
More informationdenote the location of a node, and suppose node X . This transmission causes a successful reception by node X for any other node
Fnal Report of EE359 Class Proect Throughput and Delay n Wreless Ad Hoc Networs Changhua He changhua@stanford.edu Abstract: Networ throughput and pacet delay are the two most mportant parameters to evaluate
More informationAnalysis of Energy-Conserving Access Protocols for Wireless Identification Networks
From the Proceedngs of Internatonal Conference on Telecommuncaton Systems (ITC-97), March 2-23, 1997. 1 Analyss of Energy-Conservng Access Protocols for Wreless Identfcaton etworks Imrch Chlamtac a, Chara
More informationAPPLICATION OF PROBE DATA COLLECTED VIA INFRARED BEACONS TO TRAFFIC MANEGEMENT
APPLICATION OF PROBE DATA COLLECTED VIA INFRARED BEACONS TO TRAFFIC MANEGEMENT Toshhko Oda (1), Kochro Iwaoka (2) (1), (2) Infrastructure Systems Busness Unt, Panasonc System Networks Co., Ltd. Saedo-cho
More informationCooperative Load Balancing in IEEE 802.11 Networks with Cell Breathing
Cooperatve Load Balancng n IEEE 82.11 Networks wth Cell Breathng Eduard Garca Rafael Vdal Josep Paradells Wreless Networks Group - Techncal Unversty of Catalona (UPC) {eduardg, rvdal, teljpa}@entel.upc.edu;
More informationAn Adaptive Cross-layer Bandwidth Scheduling Strategy for the Speed-Sensitive Strategy in Hierarchical Cellular Networks
An Adaptve Cross-layer Bandwdth Schedulng Strategy for the Speed-Senstve Strategy n erarchcal Cellular Networks Jong-Shn Chen #1, Me-Wen #2 Department of Informaton and Communcaton Engneerng ChaoYang Unversty
More informationM3S MULTIMEDIA MOBILITY MANAGEMENT AND LOAD BALANCING IN WIRELESS BROADCAST NETWORKS
M3S MULTIMEDIA MOBILITY MANAGEMENT AND LOAD BALANCING IN WIRELESS BROADCAST NETWORKS Bogdan Cubotaru, Gabrel-Mro Muntean Performance Engneerng Laboratory, RINCE School of Electronc Engneerng Dubln Cty
More informationRapid Estimation Method for Data Capacity and Spectrum Efficiency in Cellular Networks
Rapd Estmaton ethod for Data Capacty and Spectrum Effcency n Cellular Networs C.F. Ball, E. Humburg, K. Ivanov, R. üllner Semens AG, Communcatons oble Networs unch, Germany carsten.ball@semens.com Abstract
More informationA GENERIC HANDOVER DECISION MANAGEMENT FRAMEWORK FOR NEXT GENERATION NETWORKS
A GENERIC HANDOVER DECISION MANAGEMENT FRAMEWORK FOR NEXT GENERATION NETWORKS Shanthy Menezes 1 and S. Venkatesan 2 1 Department of Computer Scence, Unversty of Texas at Dallas, Rchardson, TX, USA 1 shanthy.menezes@student.utdallas.edu
More informationNetwork Services Definition and Deployment in a Differentiated Services Architecture
etwork Servces Defnton and Deployment n a Dfferentated Servces Archtecture E. kolouzou, S. Manats, P. Sampatakos,. Tsetsekas, I. S. Veners atonal Techncal Unversty of Athens, Department of Electrcal and
More informationA Secure Password-Authenticated Key Agreement Using Smart Cards
A Secure Password-Authentcated Key Agreement Usng Smart Cards Ka Chan 1, Wen-Chung Kuo 2 and Jn-Chou Cheng 3 1 Department of Computer and Informaton Scence, R.O.C. Mltary Academy, Kaohsung 83059, Tawan,
More informationQoS-Aware Active Queue Management for Multimedia Services over the Internet
QoS-Aware Actve Queue Management for Multmeda Servces over the Internet I-Shyan Hwang, *Bor-Junn Hwang, Pen-Mng Chang, Cheng-Yu Wang Abstract Recently, the multmeda servces such as IPTV, vdeo conference
More informationAn Intelligent Policy System for Channel Allocation of Information Appliance
Tamkang Journal of Scence and Engneerng, Vol. 5, No., pp. 63-68 (2002) 63 An Intellgent Polcy System for Channel Allocaton of Informaton Applance Cheng-Yuan Ku, Chang-Jnn Tsao 2 and Davd Yen 3 Department
More informationVoIP over Multiple IEEE 802.11 Wireless LANs
SUBMITTED TO IEEE TRANSACTIONS ON MOBILE COMPUTING 1 VoIP over Multple IEEE 80.11 Wreless LANs An Chan, Graduate Student Member, IEEE, Soung Chang Lew, Senor Member, IEEE Abstract IEEE 80.11 WLAN has hgh
More informationEfficient On-Demand Data Service Delivery to High-Speed Trains in Cellular/Infostation Integrated Networks
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. XX, NO. XX, MONTH 2XX 1 Effcent On-Demand Data Servce Delvery to Hgh-Speed Trans n Cellular/Infostaton Integrated Networks Hao Lang, Student Member,
More informationPerformance modeling and analysis of mobile Internet access via cellular networks
Performance modelng and analyss of moble Internet access va cellular networks Master s thess Author: Taoyng Yuan Emal: tyuan@few.vu.nl Student ID: #1430610 Unversty: Supervsors: Vrje Unverstet Amsterdam
More informationEnabling P2P One-view Multi-party Video Conferencing
Enablng P2P One-vew Mult-party Vdeo Conferencng Yongxang Zhao, Yong Lu, Changja Chen, and JanYn Zhang Abstract Mult-Party Vdeo Conferencng (MPVC) facltates realtme group nteracton between users. Whle P2P
More informationRecurrence. 1 Definitions and main statements
Recurrence 1 Defntons and man statements Let X n, n = 0, 1, 2,... be a MC wth the state space S = (1, 2,...), transton probabltes p j = P {X n+1 = j X n = }, and the transton matrx P = (p j ),j S def.
More informationRate Monotonic (RM) Disadvantages of cyclic. TDDB47 Real Time Systems. Lecture 2: RM & EDF. Priority-based scheduling. States of a process
Dsadvantages of cyclc TDDB47 Real Tme Systems Manual scheduler constructon Cannot deal wth any runtme changes What happens f we add a task to the set? Real-Tme Systems Laboratory Department of Computer
More informationA Dynamic Load Balancing Algorithm in Heterogeneous Network
06 7th Internatonal Conference on Intellgent Systems Modellng and Smulaton A Dynamc Load Balancng Algorthm n Heterogeneous etwork Zhxong Dng Xngjun Wang and Wenmng Yang Shenzhen Key Lab of Informaton Securty
More informationAN APPROACH TO WIRELESS SCHEDULING CONSIDERING REVENUE AND USERS SATISFACTION
The Medterranean Journal of Computers and Networks, Vol. 2, No. 1, 2006 57 AN APPROACH TO WIRELESS SCHEDULING CONSIDERING REVENUE AND USERS SATISFACTION L. Bada 1,*, M. Zorz 2 1 Department of Engneerng,
More informationAn Interest-Oriented Network Evolution Mechanism for Online Communities
An Interest-Orented Network Evoluton Mechansm for Onlne Communtes Cahong Sun and Xaopng Yang School of Informaton, Renmn Unversty of Chna, Bejng 100872, P.R. Chna {chsun,yang}@ruc.edu.cn Abstract. Onlne
More informationComputer Networks 55 (2011) 3503 3516. Contents lists available at ScienceDirect. Computer Networks. journal homepage: www.elsevier.
Computer Networks 55 (2011) 3503 3516 Contents lsts avalable at ScenceDrect Computer Networks journal homepage: www.elsever.com/locate/comnet Bonded defct round robn schedulng for mult-channel networks
More informationMultiple-Period Attribution: Residuals and Compounding
Multple-Perod Attrbuton: Resduals and Compoundng Our revewer gave these authors full marks for dealng wth an ssue that performance measurers and vendors often regard as propretary nformaton. In 1994, Dens
More informationCHOLESTEROL REFERENCE METHOD LABORATORY NETWORK. Sample Stability Protocol
CHOLESTEROL REFERENCE METHOD LABORATORY NETWORK Sample Stablty Protocol Background The Cholesterol Reference Method Laboratory Network (CRMLN) developed certfcaton protocols for total cholesterol, HDL
More informationOptimization of Resource Allocation in Wireless Systems Based on Game Theory
Internatonal Journal of Computer Scences and Engneerng Open Access Research Paper Volume-4, Issue-1 E-ISSN: 347-693 Optmzaton of Resource Allocaton n Wreless Systems Based on Game Theory Sara Rah 1*, Al
More informationOpen Access A Load Balancing Strategy with Bandwidth Constraint in Cloud Computing. Jing Deng 1,*, Ping Guo 2, Qi Li 3, Haizhu Chen 1
Send Orders for Reprnts to reprnts@benthamscence.ae The Open Cybernetcs & Systemcs Journal, 2014, 8, 115-121 115 Open Access A Load Balancng Strategy wth Bandwdth Constrant n Cloud Computng Jng Deng 1,*,
More informationReal-Time Process Scheduling
Real-Tme Process Schedulng ktw@cse.ntu.edu.tw (Real-Tme and Embedded Systems Laboratory) Independent Process Schedulng Processes share nothng but CPU Papers for dscussons: C.L. Lu and James. W. Layland,
More informationA User-Centric Approach for Dynamic Resource Allocation in CDMA systems based on Hopfield Neural Networks
A User-Centrc Approach for Dynamc esource Allocaton n CDA systems based on Hopfeld eural etworks. García. Agustí J. érez-omero Unverstat ompeu Fabra (UF) Unverstat oltècnca de Catalunya (UC) Barcelona
More informationThe Development of Web Log Mining Based on Improve-K-Means Clustering Analysis
The Development of Web Log Mnng Based on Improve-K-Means Clusterng Analyss TngZhong Wang * College of Informaton Technology, Luoyang Normal Unversty, Luoyang, 471022, Chna wangtngzhong2@sna.cn Abstract.
More informationA generalized hierarchical fair service curve algorithm for high network utilization and link-sharing
Computer Networks 43 (2003) 669 694 www.elsever.com/locate/comnet A generalzed herarchcal far servce curve algorthm for hgh network utlzaton and lnk-sharng Khyun Pyun *, Junehwa Song, Heung-Kyu Lee Department
More informationFrequency Selective IQ Phase and IQ Amplitude Imbalance Adjustments for OFDM Direct Conversion Transmitters
Frequency Selectve IQ Phase and IQ Ampltude Imbalance Adjustments for OFDM Drect Converson ransmtters Edmund Coersmeer, Ernst Zelnsk Noka, Meesmannstrasse 103, 44807 Bochum, Germany edmund.coersmeer@noka.com,
More informationModeling and Analysis of 2D Service Differentiation on e-commerce Servers
Modelng and Analyss of D Servce Dfferentaton on e-commerce Servers Xaobo Zhou, Unversty of Colorado, Colorado Sprng, CO zbo@cs.uccs.edu Janbn We and Cheng-Zhong Xu Wayne State Unversty, Detrot, Mchgan
More informationOn the Optimal Control of a Cascade of Hydro-Electric Power Stations
On the Optmal Control of a Cascade of Hydro-Electrc Power Statons M.C.M. Guedes a, A.F. Rbero a, G.V. Smrnov b and S. Vlela c a Department of Mathematcs, School of Scences, Unversty of Porto, Portugal;
More informationDistributed Optimal Contention Window Control for Elastic Traffic in Wireless LANs
Dstrbuted Optmal Contenton Wndow Control for Elastc Traffc n Wreless LANs Yalng Yang, Jun Wang and Robn Kravets Unversty of Illnos at Urbana-Champagn { yyang8, junwang3, rhk@cs.uuc.edu} Abstract Ths paper
More informationVoIP Playout Buffer Adjustment using Adaptive Estimation of Network Delays
VoIP Playout Buffer Adjustment usng Adaptve Estmaton of Network Delays Mroslaw Narbutt and Lam Murphy* Department of Computer Scence Unversty College Dubln, Belfeld, Dubln, IRELAND Abstract The poor qualty
More informationDBA-VM: Dynamic Bandwidth Allocator for Virtual Machines
DBA-VM: Dynamc Bandwdth Allocator for Vrtual Machnes Ahmed Amamou, Manel Bourguba, Kamel Haddadou and Guy Pujolle LIP6, Perre & Mare Cure Unversty, 4 Place Jusseu 755 Pars, France Gand SAS, 65 Boulevard
More informationFault tolerance in cloud technologies presented as a service
Internatonal Scentfc Conference Computer Scence 2015 Pavel Dzhunev, PhD student Fault tolerance n cloud technologes presented as a servce INTRODUCTION Improvements n technques for vrtualzaton and performance
More information1. Fundamentals of probability theory 2. Emergence of communication traffic 3. Stochastic & Markovian Processes (SP & MP)
6.3 / -- Communcaton Networks II (Görg) SS20 -- www.comnets.un-bremen.de Communcaton Networks II Contents. Fundamentals of probablty theory 2. Emergence of communcaton traffc 3. Stochastc & Markovan Processes
More informationPolitecnico di Torino. Porto Institutional Repository
Poltecnco d Torno Porto Insttutonal Repostory [Artcle] A cost-effectve cloud computng framework for acceleratng multmeda communcaton smulatons Orgnal Ctaton: D. Angel, E. Masala (2012). A cost-effectve
More informationHow To Solve An Onlne Control Polcy On A Vrtualzed Data Center
Dynamc Resource Allocaton and Power Management n Vrtualzed Data Centers Rahul Urgaonkar, Ulas C. Kozat, Ken Igarash, Mchael J. Neely urgaonka@usc.edu, {kozat, garash}@docomolabs-usa.com, mjneely@usc.edu
More informationDEFINING %COMPLETE IN MICROSOFT PROJECT
CelersSystems DEFINING %COMPLETE IN MICROSOFT PROJECT PREPARED BY James E Aksel, PMP, PMI-SP, MVP For Addtonal Informaton about Earned Value Management Systems and reportng, please contact: CelersSystems,
More informationJ. Parallel Distrib. Comput.
J. Parallel Dstrb. Comput. 71 (2011) 62 76 Contents lsts avalable at ScenceDrect J. Parallel Dstrb. Comput. journal homepage: www.elsever.com/locate/jpdc Optmzng server placement n dstrbuted systems n
More informationCALL ADMISSION CONTROL IN WIRELESS MULTIMEDIA NETWORKS
CALL ADMISSION CONTROL IN WIRELESS MULTIMEDIA NETWORKS Novella Bartoln 1, Imrch Chlamtac 2 1 Dpartmento d Informatca, Unverstà d Roma La Sapenza, Roma, Italy novella@ds.unroma1.t 2 Center for Advanced
More informationQOS DISTRIBUTION MONITORING FOR PERFORMANCE MANAGEMENT IN MULTIMEDIA NETWORKS
QOS DISTRIBUTION MONITORING FOR PERFORMANCE MANAGEMENT IN MULTIMEDIA NETWORKS Yumng Jang, Chen-Khong Tham, Ch-Chung Ko Department Electrcal Engneerng Natonal Unversty Sngapore 119260 Sngapore Emal: {engp7450,
More informationRESEARCH ON DUAL-SHAKER SINE VIBRATION CONTROL. Yaoqi FENG 1, Hanping QIU 1. China Academy of Space Technology (CAST) yaoqi.feng@yahoo.
ICSV4 Carns Australa 9- July, 007 RESEARCH ON DUAL-SHAKER SINE VIBRATION CONTROL Yaoq FENG, Hanpng QIU Dynamc Test Laboratory, BISEE Chna Academy of Space Technology (CAST) yaoq.feng@yahoo.com Abstract
More informationLuby s Alg. for Maximal Independent Sets using Pairwise Independence
Lecture Notes for Randomzed Algorthms Luby s Alg. for Maxmal Independent Sets usng Parwse Independence Last Updated by Erc Vgoda on February, 006 8. Maxmal Independent Sets For a graph G = (V, E), an ndependent
More informationData Broadcast on a Multi-System Heterogeneous Overlayed Wireless Network *
JOURNAL OF INFORMATION SCIENCE AND ENGINEERING 24, 819-840 (2008) Data Broadcast on a Mult-System Heterogeneous Overlayed Wreless Network * Department of Computer Scence Natonal Chao Tung Unversty Hsnchu,
More informationAn Introduction to 3G Monte-Carlo simulations within ProMan
An Introducton to 3G Monte-Carlo smulatons wthn ProMan responsble edtor: Hermann Buddendck AWE Communcatons GmbH Otto-Llenthal-Str. 36 D-71034 Böblngen Phone: +49 70 31 71 49 7-16 Fax: +49 70 31 71 49
More informationANALYZING THE RELATIONSHIPS BETWEEN QUALITY, TIME, AND COST IN PROJECT MANAGEMENT DECISION MAKING
ANALYZING THE RELATIONSHIPS BETWEEN QUALITY, TIME, AND COST IN PROJECT MANAGEMENT DECISION MAKING Matthew J. Lberatore, Department of Management and Operatons, Vllanova Unversty, Vllanova, PA 19085, 610-519-4390,
More informationSchedulability Bound of Weighted Round Robin Schedulers for Hard Real-Time Systems
Schedulablty Bound of Weghted Round Robn Schedulers for Hard Real-Tme Systems Janja Wu, Jyh-Charn Lu, and We Zhao Department of Computer Scence, Texas A&M Unversty {janjaw, lu, zhao}@cs.tamu.edu Abstract
More informationImproving Perceived Speech Quality for Wireless. VoIP By Cross-Layer Designs
Improvng Perceved Speech Qualty for Wreless VoIP By Cross-Layer Desgns By Zhuoqun L Ths dssertaton s submtted to the Unversty of Plymouth n partal fulflment of the award of Master of Research n Network
More informationA hybrid global optimization algorithm based on parallel chaos optimization and outlook algorithm
Avalable onlne www.ocpr.com Journal of Chemcal and Pharmaceutcal Research, 2014, 6(7):1884-1889 Research Artcle ISSN : 0975-7384 CODEN(USA) : JCPRC5 A hybrd global optmzaton algorthm based on parallel
More informationTraffic State Estimation in the Traffic Management Center of Berlin
Traffc State Estmaton n the Traffc Management Center of Berln Authors: Peter Vortsch, PTV AG, Stumpfstrasse, D-763 Karlsruhe, Germany phone ++49/72/965/35, emal peter.vortsch@ptv.de Peter Möhl, PTV AG,
More informationSangam - Efficient Cellular-WiFi CDN-P2P Group Framework for File Sharing Service
Sangam - Effcent Cellular-WF CDN-P2P Group Framework for Fle Sharng Servce Anjal Srdhar Unversty of Illnos, Urbana-Champagn Urbana, USA srdhar3@llnos.edu Klara Nahrstedt Unversty of Illnos, Urbana-Champagn
More informationPolling Cycle Time Analysis for Waited-based DBA in GPONs
Proceedngs of the Internatonal MultConference of Engneers and Computer Scentsts 03 Vol II, IMECS 03, March 3-5, 03, Hong Kong Pollng Cycle me Analyss for Wated-based DBA n GPOs I-Shyan Hwang, Jhong-Yue
More informationReinforcement Learning for Quality of Service in Mobile Ad Hoc Network (MANET)
Renforcement Learnng for Qualty of Servce n Moble Ad Hoc Network (MANET) *T.KUMANAN AND **K.DURAISWAMY *Meenaksh College of Engneerng West K.K Nagar, Cheena-78 **Dean/academc,K.S.R College of Technology,Truchengode
More informationForecasting the Direction and Strength of Stock Market Movement
Forecastng the Drecton and Strength of Stock Market Movement Jngwe Chen Mng Chen Nan Ye cjngwe@stanford.edu mchen5@stanford.edu nanye@stanford.edu Abstract - Stock market s one of the most complcated systems
More informationA FRAMEWORK FOR EFFICIENT BANDWIDTH MANAGEMENT IN BROADBAND WIRELESS ACCESS SYSTEMS
A FRAMEWORK FOR EFFICIENT BANDWIDTH MANAGEMENT IN BROADBAND WIRELESS ACCESS SYSTEMS BY BADER S. AL-MANTHARI A thess submtted to the School of Computng n conformty wth the requrements for the degree of
More informationHow To Detect An 802.11 Traffc From A Network With A Network Onlne Onlnet
IEEE TRANSACTIONS ON MOBILE COMPUTING, VOL. X, NO. X, XXX 2008 1 Passve Onlne Detecton of 802.11 Traffc Usng Sequental Hypothess Testng wth TCP ACK-Pars We We, Member, IEEE, Kyoungwon Suh, Member, IEEE,
More informationAN APPOINTMENT ORDER OUTPATIENT SCHEDULING SYSTEM THAT IMPROVES OUTPATIENT EXPERIENCE
AN APPOINTMENT ORDER OUTPATIENT SCHEDULING SYSTEM THAT IMPROVES OUTPATIENT EXPERIENCE Yu-L Huang Industral Engneerng Department New Mexco State Unversty Las Cruces, New Mexco 88003, U.S.A. Abstract Patent
More informationAn Alternative Way to Measure Private Equity Performance
An Alternatve Way to Measure Prvate Equty Performance Peter Todd Parlux Investment Technology LLC Summary Internal Rate of Return (IRR) s probably the most common way to measure the performance of prvate
More informationVOLUME 5 BLAGOEVGRAD, BULGARIA SCIENTIFIC. Research ELECTRONIC ISSUE ISSN 1312-7535
VOLUME 5 007 BLAGOEVGRAD, BULGARIA SCIENTIFIC Research ISSN 131-7535 ELECTRONIC ISSUE IMPROVING FAIRNESS IN CDMA-HDR NETWORKS Valentn Hrstov Abstract. Improvng throughput and farness n Cellular Data Networks
More informationAn Inter-Frame De-Jittering Scheme for Video Streaming over Mobile Communication Networks
An Inter-Frame De-Jtterng Scheme for Vdeo Streamng over Moble Communcaton Networks Tsang-Lng Sheu and Po-Wen Lee Department of Electrcal Engneerng Natonal Sun Yat-Sen Unversty Kaohsung, Tawan sheu@ee.nsysu.edu.tw
More informationA Design Method of High-availability and Low-optical-loss Optical Aggregation Network Architecture
A Desgn Method of Hgh-avalablty and Low-optcal-loss Optcal Aggregaton Network Archtecture Takehro Sato, Kuntaka Ashzawa, Kazumasa Tokuhash, Dasuke Ish, Satoru Okamoto and Naoak Yamanaka Dept. of Informaton
More informationOptimal Pricing for Integrated-Services Networks. with Guaranteed Quality of Service &
Optmal Prcng for Integrated-Servces Networks wth Guaranteed Qualty of Servce & y Qong Wang * Jon M. Peha^ Marvn A. Sru # Carnege Mellon Unversty Chapter n Internet Economcs, edted y Joseph Baley and Lee
More informationRelay Secrecy in Wireless Networks with Eavesdropper
Relay Secrecy n Wreless Networks wth Eavesdropper Parvathnathan Venktasubramanam, Tng He and Lang Tong School of Electrcal and Computer Engneerng Cornell Unversty, Ithaca, NY 14853 Emal : {pv45, th255,
More informationtaposh_kuet20@yahoo.comcsedchan@cityu.edu.hk rajib_csedept@yahoo.co.uk, alam_shihabul@yahoo.com
G. G. Md. Nawaz Al 1,2, Rajb Chakraborty 2, Md. Shhabul Alam 2 and Edward Chan 1 1 Cty Unversty of Hong Kong, Hong Kong, Chna taposh_kuet20@yahoo.comcsedchan@ctyu.edu.hk 2 Khulna Unversty of Engneerng
More informationA New Quality of Service Metric for Hard/Soft Real-Time Applications
A New Qualty of Servce Metrc for Hard/Soft Real-Tme Applcatons Shaoxong Hua and Gang Qu Electrcal and Computer Engneerng Department and Insttute of Advanced Computer Study Unversty of Maryland, College
More informationEnd-to-end measurements of GPRS-EDGE networks have
End-to-end measurements over GPRS-EDGE networks Juan Andrés Negrera Facultad de Ingenería, Unversdad de la Repúblca Montevdeo, Uruguay Javer Perera Facultad de Ingenería, Unversdad de la Repúblca Montevdeo,
More informationAn RFID Distance Bounding Protocol
An RFID Dstance Boundng Protocol Gerhard P. Hancke and Markus G. Kuhn May 22, 2006 An RFID Dstance Boundng Protocol p. 1 Dstance boundng Verfer d Prover Places an upper bound on physcal dstance Does not
More informationAnalysis of the Delay and Jitter of Voice Traffic Over the Internet
Analyss of the Delay and Jtter of Voce Traffc Over the Internet Mansour J. Karam, Fouad A. Tobag Abstract In the future, voce communcaton s expected to mgrate from the Publc Swtched Telephone Network (PSTN)
More informationFOURTH Generation (4G) Wireless Networks are developed
2600 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 9, NO. 8, AUGUST 2010 Congeston-Based Prcng Resource Management n Broadband Wreless Networks Najah AbuAl, Mohammad Hayajneh, and Hossam Hassanen
More informationPSYCHOLOGICAL RESEARCH (PYC 304-C) Lecture 12
14 The Ch-squared dstrbuton PSYCHOLOGICAL RESEARCH (PYC 304-C) Lecture 1 If a normal varable X, havng mean µ and varance σ, s standardsed, the new varable Z has a mean 0 and varance 1. When ths standardsed
More informationQuality of Service Provisioning in Wireless Networks
Qualty of Servce Provsonng n Wreless Networks Research Thess Submtted n Partal Fulfllment of the Requrements for the Degree of Doctor of Phlosophy Hwee Pnk Tan Submtted to the Senate of The Technon - Israel
More informationChapter 4 ECONOMIC DISPATCH AND UNIT COMMITMENT
Chapter 4 ECOOMIC DISATCH AD UIT COMMITMET ITRODUCTIO A power system has several power plants. Each power plant has several generatng unts. At any pont of tme, the total load n the system s met by the
More informationQoS-Aware Spectrum Sharing in Cognitive Wireless Networks
QoS-Aware Spectrum Sharng n Cogntve reless Networks Long Le and Ekram Hossan Abstract e consder QoS-aware spectrum sharng n cogntve wreless networks where secondary users are allowed to access the spectrum
More informationLoad Balancing Based on Clustering Methods for LTE Networks
Cyber Journals: Multdscplnary Journals n Scence and Technology Journal of Selected Areas n Telecommuncatons (JSAT) February Edton 2013 Volume 3 Issue 2 Load Balancng Based on Clusterng Methods for LTE
More informationA heuristic task deployment approach for load balancing
Xu Gaochao, Dong Yunmeng, Fu Xaodog, Dng Yan, Lu Peng, Zhao Ja Abstract A heurstc task deployment approach for load balancng Gaochao Xu, Yunmeng Dong, Xaodong Fu, Yan Dng, Peng Lu, Ja Zhao * College of
More informationCloudMedia: When Cloud on Demand Meets Video on Demand
CloudMeda: When Cloud on Demand Meets Vdeo on Demand Yu Wu, Chuan Wu, Bo L, Xuanja Qu, Francs C.M. Lau Department of Computer Scence, The Unversty of Hong Kong, Emal: {ywu,cwu,xjqu,fcmlau}@cs.hku.hk Department
More informationAn Evaluation of the Extended Logistic, Simple Logistic, and Gompertz Models for Forecasting Short Lifecycle Products and Services
An Evaluaton of the Extended Logstc, Smple Logstc, and Gompertz Models for Forecastng Short Lfecycle Products and Servces Charles V. Trappey a,1, Hsn-yng Wu b a Professor (Management Scence), Natonal Chao
More informationNetwork Security Situation Evaluation Method for Distributed Denial of Service
Network Securty Stuaton Evaluaton Method for Dstrbuted Denal of Servce Jn Q,2, Cu YMn,2, Huang MnHuan,2, Kuang XaoHu,2, TangHong,2 ) Scence and Technology on Informaton System Securty Laboratory, Bejng,
More informationOne-Shot Games for Spectrum Sharing among Co-Located Radio Access Networks
One-Shot Games for Spectrum Sharng among Co-Located Rado Access etwors Sofonas Halu, Alexs A. Dowhuszo, Olav Tronen and Lu We Department of Communcatons and etworng, Aalto Unversty, P.O. Box 3000, FI-00076
More informationRisk Model of Long-Term Production Scheduling in Open Pit Gold Mining
Rsk Model of Long-Term Producton Schedulng n Open Pt Gold Mnng R Halatchev 1 and P Lever 2 ABSTRACT Open pt gold mnng s an mportant sector of the Australan mnng ndustry. It uses large amounts of nvestments,
More informationAgile Traffic Merging for Data Center Networks. Qing Yi and Suresh Singh Portland State University, Oregon June 10 th, 2014
Agle Traffc Mergng for Data Center Networks Qng Y and Suresh Sngh Portland State Unversty, Oregon June 10 th, 2014 Agenda Background and motvaton Power optmzaton model Smulated greedy algorthm Traffc mergng
More informationDynamic Fleet Management for Cybercars
Proceedngs of the IEEE ITSC 2006 2006 IEEE Intellgent Transportaton Systems Conference Toronto, Canada, September 17-20, 2006 TC7.5 Dynamc Fleet Management for Cybercars Fenghu. Wang, Mng. Yang, Ruqng.
More informationComplex Service Provisioning in Collaborative Cloud Markets
Melane Sebenhaar, Ulrch Lampe, Tm Lehrg, Sebastan Zöller, Stefan Schulte, Ralf Stenmetz: Complex Servce Provsonng n Collaboratve Cloud Markets. In: W. Abramowcz et al. (Eds.): Proceedngs of the 4th European
More informationA Novel Problem-solving Metric for Future Internet Routing Based on Virtualization and Cloud-computing
www.ijcsi.org 159 A Novel Problem-solvng Metrc for Future Internet Routng Based on Vrtualzaton and Cloud-computng Rujuan Zheng, Mngchuan Zhang, Qngtao Wu, Wangyang We and Haxa Zhao Electronc & Informaton
More informationJoint Dynamic Radio Resource Allocation and Mobility Load Balancing in 3GPP LTE Multi-Cell Network
288 FENG LI, LINA GENG, SHIHUA ZHU, JOINT DYNAMIC RADIO RESOURCE ALLOCATION AND MOBILITY LOAD BALANCING Jont Dynamc Rado Resource Allocaton and Moblty Load Balancng n 3GPP LTE Mult-Cell Networ Feng LI,
More informationROSA: Distributed Joint Routing and Dynamic Spectrum Allocation in Cognitive Radio Ad Hoc Networks
ROSA: Dstrbuted Jont Routng and Dynamc Spectrum Allocaton n Cogntve Rado Ad Hoc Networks Le Dng Tommaso Meloda Stella Batalama Mchael J. Medley Department of Electrcal Engneerng, State Unversty of New
More informationEvaluation of Coordination Strategies for Heterogeneous Sensor Networks Aiming at Surveillance Applications
Evaluaton of Coordnaton Strateges for Heterogeneous Sensor Networs Amng at Survellance Applcatons Edson Pgnaton de Fretas, *, Tales Hemfarth*, Carlos Eduardo Perera*, Armando Morado Ferrera, Flávo Rech
More informationOn File Delay Minimization for Content Uploading to Media Cloud via Collaborative Wireless Network
On Fle Delay Mnmzaton for Content Uploadng to Meda Cloud va Collaboratve Wreless Network Ge Zhang and Yonggang Wen School of Computer Engneerng Nanyang Technologcal Unversty Sngapore Emal: {zh0001ge, ygwen}@ntu.edu.sg
More informationA DYNAMIC CRASHING METHOD FOR PROJECT MANAGEMENT USING SIMULATION-BASED OPTIMIZATION. Michael E. Kuhl Radhamés A. Tolentino-Peña
Proceedngs of the 2008 Wnter Smulaton Conference S. J. Mason, R. R. Hll, L. Mönch, O. Rose, T. Jefferson, J. W. Fowler eds. A DYNAMIC CRASHING METHOD FOR PROJECT MANAGEMENT USING SIMULATION-BASED OPTIMIZATION
More informationSession-Based Overload Control in QoS-Aware Web Servers
Sesson-Based Overload Control n QoS-Aware Web Servers Huamn Chen and Prasant Mohapatra Abstract Wth the explosve use of Internet, contemporary web servers are susceptble to overloads and ther servces deterorate
More information