bảo mật ieee 802 11

Báo cáo hóa học: " Adjustable TXOP mechanism for supporting video transmission in IEEE 802.11e HCCA" potx

Ngày tải lên : 20/06/2014, 22:20

... April 2 011 Accepted: November 2 011 Published: November 2 011 References Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications IEEE Standard 802. 11 (1999) IEEE Std 802. 11e-2005, ... for IEEE 802. 11e wireless LAN Mob Netw Appl 11( 3), 391403 (2006) doi:10.1007/s11036-006-5191-z N Passas, D Skyrianoglou, P Mouziouras, Prioritized support of different traffic classes in IEEE 802. 11e ... services with the 802. 11e MAC IEEE/ ACM Trans Netw 15(2), 323333 (2007) 12 A Jansang, A Phonphoem, B Paillassa, Analytical Model for Expected Packet Delay Evaluation in IEEE 802. 11e, in Proceedings...

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Báo cáo hóa học: " Dynamic tuning of the IEEE 802.11 distributed coordination function to derive a theoretical throughput limit" pot

Ngày tải lên : 20/06/2014, 22:20

... 500 Bytes: IEEE 802. 11+ vs DCW (d) 1500 Bytes: IEEE 802. 11+ vs DCW (f) 2312 Bytes: IEEE 802. 11+ vs DCW Figure Normalized throughput (a) 500 bytes: DCF versus DCW (b) 500 bytes: IEEE 802. 11+ versus ... 1500 Bytes: IEEE 802. 11+ vs DCW (e) 2312 Bytes: DCF vs DCW (f) 2312 Bytes: IEEE 802. 11+ vs DCW Figure Collision probability (a) 500 bytes: DCF versus DCW (b) 500 bytes: IEEE 802. 11+ versus DCW ... differences in IEEE 802. 11+ [4] and DCW, the scale for the y-axis in Figure 7a, c, e (DCF versus DCW) as well as Figure 7b, d, f (IEEE 802. 11+ versus DCW) is different IEEE 802. 11 + is very close...

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Báo cáo hóa học: " Research Article Design and Implementation of a Lightweight Security Model to Prevent IEEE 802.11 Wireless DoS Attacks" pdf

Ngày tải lên : 21/06/2014, 05:20

... InterfaceTable tcp q: # udp q: # NetworkLayer 8021 1 ACFNC NIC pingApp q: # Radio 8021 1 ACFNC MAC 8021 1 MgmtAP STSF Figure 5: Structure of the protected 8021 1-ACFNC-NIC in the simulation environment ... determine these ﬁve threshold time windows, some IEEE 802. 11 standard notations [1, 27] are used which are identiﬁed in Table In the IEEE 802. 11 standard, except for the unicast data and management ... The details are as follows 4.1 Simulation of the IEEE 802. 11 Current Model The simulation environment A is developed to implement the IEEE 802. 11 current model It consists of two areas as authorized...

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Báo cáo hóa học: " Research Article An IEEE 802.11 EDCA Model with Support for Analysing Networks with Misbehaving Nodes" ppt

Ngày tải lên : 21/06/2014, 11:20

... dropped Table contains the standard values of the EDCA parameters for IEEE 802. 11 HR/DSSS (known as 802. 11b) [1] Furthermore, for 802. 11b the standard defines NC = 4, M equal to or (depending on frame ... attack,” IEEE/ ACM Transactions on Networking, vol 14, no 6, pp 116 7 117 8, 2006 [11] K J Park, J Choi, K Kang, and Y C Hu, “Malicious or selfish? Analysis of carrier sense misbehavior in IEEE 802. 11 ... LAN Medium Access Control(MAC) and Physical Layer (PHY) Specifications,” IEEE Std 802. 11- 2007(Revision of IEEE Std 802. 11- 1999), 2007 [2] Madwifi Project, http://madwifi-project.org/ [3] G Bianchi,...

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Báo cáo hóa học: " Research Article Channel Resource Allocation for VoIP Applications in Collaborative IEEE 802.11/802.16 Networks" ppt

Ngày tải lên : 21/06/2014, 11:20

... collaborative IEEE 802. 11 /802. 16 network Numerical results are provided in Section with important conclusions drawn in Section Overview of the IEEE 802. 11 and the IEEE 802. 16 MAC Protocols 2.1 IEEE 802. 11 ... Building Building 802. 16 BS 802. 11 AP + 802. 16 SS 802. 11 AP + 802. 16 SS CFP Beacon Beacon Beacon Beacon Figure 1: A typical scenario of the collaborative IEEE 802. 11 and IEEE 802. 16 networks CFP ... for the IEEE 802. 16 and the IEEE 802. 11 MAC protocols Precisely, we analyzed the IEEE 802. 11 and the IEEE 802. 16 MAC protocols, frame structures, and proposed to embed multiple IEEE 802. 16 frames...

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Báo cáo hóa học: " Research Article Reducing the MAC Latency for IEEE 802.11 Vehicular Internet Access" pdf

Ngày tải lên : 21/06/2014, 17:20

... 802. 11 b, a myriad of research has been conducted for other standards in the 802. 11 family, conﬁrming the suitability of 802. 11 WLANs for vehicle scenarios [6, 7] 2.2 Handoﬀ In the IEEE 802. 11 ... “An Integrated CMOS RF Synthesizer for 802. 11a Wireless LAN,” IEEE Journal of SolidState Circuits, vol 38, no 10, pp 1767–1770, 2003 [12] IEEE 802. 11, “Part11: Wireless LAN Medium Access Control ... scanning delay Our approach may be even more favorable for 802. 11 a than for 802. 11 b, since the scanning delay will be even higher for 802. 11 a with 32 channels Conclusions Much research has been...

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báo cáo hóa học:" Research Article Linking Users’ Subjective QoE Evaluation to Signal Strength in an IEEE 802.11b/g Wireless LAN Environment" doc

Ngày tải lên : 21/06/2014, 18:20

... Wireless Communications and Networking and evaluated in terms of QoE by a user panel in an indoor IEEE 802. 11b/g Wireless LAN environment By means of a short questionnaire presented to the users on ... weighs 140 g and has a 2.7” screen with a color display It incorporates GSM/GPRS/EDGE, WiFi (IEEE 802. 11b/g), and Bluetooth The device has 128 MB of storage memory and 64 MB of RAM This high-end ... Test Environment: Indoor Wireless The tests took place in an indoor Wi-Fi oﬃce environment (IEEE 802. 11b/g), in which four diﬀerent locations were selected At every location, another usage scenario...

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Báo cáo hóa học: " Research Article Connectivity-Based Reliable Multicast MAC Protocol for IEEE 802.11 Wireless LANs" doc

Ngày tải lên : 21/06/2014, 23:20

... transmitted with the peak rate 54 Mbps of IEEE 802. 11a wireless LANs When the multicast and uplink user payloads of 88 bits or 1000 bits are transmitted in IEEE 802. 11a wireless LANs, we present the ... for IEEE 802. 11 wireless LANs,” EURASIP Journal on Wireless Communications and Networking, vol 2008, Article ID 598038, 10 pages, 2008 [11] K Xu, M Gerla, and S Bae, “How eﬀective is the IEEE 802. 11 ... and W Liao, “Performance analysis of reliable MAC-layer multicast for IEEE 802. 11 wireless LANs,” in Proceedings of the IEEE International Conference on Communications (ICC ’05), vol 2, pp 1378–1382,...

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Báo cáo hóa học: " Research Article Efﬁcient Transmission of H.264 Video over Multirate IEEE 802.11e WLANs" docx

Ngày tải lên : 21/06/2014, 23:20

... Medium Access Control (MAC) and Physical Layer (PHY) speciﬁcations,” ANSI /IEEE Std 802. 11: 1999 (E) Part 11, ISO/IEC 8802- 11, 1999 14 EURASIP Journal on Wireless Communications and Networking [3] ... improvement of H.264 video transmission over IEEE 802. 11e through a cross-layer architecture,” IEEE Communications Magazine, vol 44, no 1, pp 107 114 , 2006 [11] P Bucciol, G Davini, E Masala, E Filippi, ... the packet loss ratios The WLAN used for these simulations was an 802. 11e network with an 802. 11b PHY layer (maximum PHY rate of 11 Mbps) In this experiment, an uplink video session coexisted with...

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Báo cáo hóa học: " Article ID 598038, 10 pages doi:10.1155/2008/598038 Research Article Hybrid Polling Method for Direct Link Communication for IEEE 802.11 Wireless LANs Woo-Yong Choi" pot

Ngày tải lên : 21/06/2014, 23:20

... the heavy traffic load (B = 11) is imposed on IEEE 802. 11a wireless LAN with 20 STAs Figure 8: Mean delay bounds when the medium traffic load (B = 7) is imposed on IEEE 802. 11a wireless LAN with 30 ... traffic load (B = 8) is imposed on IEEE 802. 11a wireless LAN with 30 STAs Figure 11: Mean delay bounds when the medium traffic load (B = 5) is imposed on IEEE 802. 11a wireless LAN with 40 STAs 500 ... time is microseconds in IEEE 802. 11a wireless LANs In Figures 4, 5, 6, 7, 8, 9, 10, 11, and 12, we present the simulation results of the maximum delay bounds of IEEE 802. 11a wireless LAN with the...

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Báo cáo hóa học: " Research Article Achievable Throughput-Based MAC Layer Handoff in IEEE 802.11 Wireless Local Area Networks" pptx

Ngày tải lên : 21/06/2014, 23:20

... denotes that 802. 11b APs are saturated, STAs in LLF mechanism are likely to select 802. 11b APs since the loaded traﬃc on the 802. 11b APs ( 11 Mbps) is less than that on the 802. 11a APs (≤54 Mbps) ... Gigabit Ethernet AP 802. 11b channel #1 AP 802. 11b nAP channel #11 10.1.1.100 cAP 10.1.2.100 Wireless network monitor (NetMon) 10.1.1.1 s1 10.1.1.2 s2 Windows laptops (XP) 802. 11b NIC STA 10.1.2.1 ... (250,250) (0,300) (300,300) 802. 11a AP (54 Mbps) 802. 11b AP (11 Mbps) Figure 12: Simulation environment Throughput per a STA (Kbps) 800 600 400 200 50 Value 300 × 300 m2 11 and 54 Mbps (Fixed) 100...

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Báo cáo hóa học: " Research Article Modiﬁed Isochronous Coordination Function for Enhancement of VoIP Call Capacity over IEEE 802.11 WLAN" pptx

Ngày tải lên : 22/06/2014, 19:20

... QoS [1] IEEE 802. 11, IEEE Standards for Information Technology— Telecommunication and Information Exchange between Systems—Local and Metropolitan Area Network—Speciﬁc Requirement—Part 11: “Wireless ... over IEEE 802. 11 wireless local area networks,” IEEE Wireless Communications, vol 13, no 1, pp 22–29, 2006 [10] W Wang, S C Liew, and V O K Li, “Solutions to performance problems in VoIP over a 802. 11 ... Italy, July 2001 [4] D P Hole and F A Tobagi, “Capacity of an IEEE 802. 11b wireless LAN supporting VoIP,” in Proceedings of the IEEE International Conference on Communications (ICC ’04), vol...

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Báo cáo hóa học: " CSMA/CCA: A Modiﬁed CSMA/CA Protocol Mitigating the Fairness Problem for IEEE 802.11 DCF" docx

Ngày tải lên : 22/06/2014, 22:20

... throughput 10.9465 11. 1360 10.8232 11. 4992 11. 5067 11. 2967 10.2350 10.0668 10.2854 15.2702 15.1787 16 .110 5 STA4-AP1 throughput AP1-STA1 throughput 10.9170 10.7715 11. 3074 11. 3690 10.1881 8.9339 ... 0.00078 7.3018 0.0077 4.0305 0.0 011 0.7578 Fairness index LFI 1.2516 1.7953 1.3645 1.0560 IEEE 802. 11 DCF Therefore, it can be readily deployed in the existing IEEE 802. 11 WLANs DISCLAIMER The views ... enhancements for quality of service (QoS), IEEE 802. 11e/D3.3.2, November 2002 G Bianchi, “Performance analysis of the IEEE 802. 11 distributed coordination function,” IEEE Journal on Selected Areas in...

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Báo cáo hóa học: " Static and Dynamic 4-Way Handshake Solutions to Avoid Denial of Service Attack in Wi-Fi Protected Access and IEEE 802.11i" potx

Ngày tải lên : 22/06/2014, 22:20

... With attack With 10 attacks (i) Standard protocol (WPA /IEEE 802. 11i) without attack, WPA /IEEE8 02.11i with DoS attack, and WPA/ IEEE 802. 11i with DoS ﬂooding attack (ii) Solution I without attack, ... is proposed In the following a brief overview of WPA and IEEE 802. 11i and 4-way handshake will be given OVERVIEW OF WPA AND IEEE 802. 11i When the security bugs of WEP were outlined, it was clear ... possible Wi-Fi alliance and the IEEE 802. 11i agree with the need to develop a novel standard, able to overcome all the security bugs This standard was the IEEE 802. 11i [6] However, this novel protocol...

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Báo cáo hóa học: " IEEE 802.11 Wireless LANs: Performance Analysis and Protocol Reﬁnement" pot

Ngày tải lên : 23/06/2014, 00:20

... parameter based on a p-persistent version of the IEEE 802. 11 protocol Aad and Castelluccia in [11] suggests three different ways to enhance 802. 11 performance; by scaling the CW based on the priority ... validated by comparing analytical with simulation results obtained using our IEEE 802. 11 simulator This IEEE 802. 11 simulator is developed using the OPNET modeler communication networks modeling ... values and packet element transmission times defined by IEEE 802. 11 specifications Furthermore, we have suitably modified the model of the IEEE 802. 11 wireless station provided in the standard library...

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Báo cáo bài tập lớn phân lớp MAC trong IEEE 802.11n

Ngày tải lên : 05/11/2015, 11:10

... [2] 802. 11- 1999, IEEE, 1999 [3] 802. 11a-1999, IEEE, 1999 [4] 802. 11b-1999_Cor1-2001, IEEE, 2001 [5] 802. 11e-2005, IEEE, 2005 [6] 802. 11g-2003, IEEE, 2003 [7] 802. 11i-2004, IEEE, 2004 [8] 802. 11n ... u ta có th nh n th y IEEE 802. 11n có nh ng u m v t tr i so v i chu n tr c ó v thông l ng, tin c y IEEE 802. 11n ng thích t t v i chu n tr c nh 802. 11 a/b/g S i c a IEEE 802. 11n c mong i s áp ng ... Ethernet sang d ng khung 802. 11, sau ó gom khung 802. 11 l i B i khung 802. 11 ã có nh d ng phù p truy n i m ng WLAN nên không c n có trình óng gói vào m t khung 802. 11 chung Hình 3 .11: K t h p khung...

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BÁO cáo THỰC tập: Nghiên cứu phương pháp thiết kế mạng WLAN theo chuẩn IEEE 802 11

Ngày tải lên : 04/04/2016, 08:24

... chuẩn 802. 11 có nhiều phần mở rộng ba tiêu chuẩn IEEE 802. 11b, IEEE 802. 11a, IEEE 802. 11g quan trọng nhất, đời chuẩn IEEE 802. 11i IEEE 802. 11n 3.2 IEEE 802. 11b Được đưa vào năm 1999, tiêu chuẩn IEEE ... chuẩn IEEE 802. 11 18 3.1Nguồn gốc đời chuẩn IEEE 802. 11 18 3. 2IEEE 802. 11b .18 3. 3IEEE 802. 11a .20 3. 4IEEE 802. 11g .21 3.5 IEEE 802. 11i ... hoá thành chuỗi bit Vídụ: mà hoá thành10 0111 00 011 Và mã hoá là: 0110 0 0111 00 Thì việc truyền chuỗi 101 thành gửi chuỗi: 10 0111 00 0110 1100 0111 0010 0111 00 011 Các mã chip thông thường nghịch đảo lẫn...

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MOB Subject 6 - IEEE 802.11 standards Wifi operation

Ngày tải lên : 17/09/2012, 09:13

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MOB Subject 7 –IEEE 802.11 standards Wifi performances

Ngày tải lên : 17/09/2012, 09:13

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GIẢI PHÁP NÂNG CAO ĐỘ AN NINH THÔNG TIN TRONG MẠNG LAN KHÔNG DÂY CHUẨN IEEE 802.11i

Ngày tải lên : 06/11/2012, 12:50

... DÂY CHUẨN 802. 11i 3.1 Tổng quan chuẩn IEEE 802. 11i Nhóm IEEE 802. 11i tích cực nghiên cứu để đưa giải pháp thay cho WEP Giải pháp tổng thể IEEE 802. 11i dựa thành phần: TKIP, CCMP, IEEE 802. 1x Hình ... lý PHY a Chuẩn 802. 11b 802. 11b chuẩn đáp ứng đủ cho phần lớn ứng dụng mạng Với giải pháp hoàn thiên, 802. 11b có nhiều đặc điểm thuận lợi so với chuẩn không dây khác Chuẩn 802. 11b sử dụng kiểu ... tế Nhược điểm 802. 11b họat động dải tần 2,4 GHz trùng với dải tần nhiều thiết bị gia đình lò vi sóng , điện thoại mẹ nên bị nhiễu b Chuẩn 802. 11a Chuẩn 802. 11a phiên nâng cấp 802. 11b, hoạt động...

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