overview of ieee 802 11 protocol

... enhance the performance of IEEE 802. 11 DCF Wirel Personal Commun 36(1), 29–44 (2006) doi:10.1007/s11277-006-6176-8 F Cali, M Conti, E Gregori, Dynamic tuning of the IEEE 802. 11 protocol to achieve ... 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...

Ngày tải lên: 20/06/2014, 22:20

... 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 B the percentage of performance ... the IEEE 802. 11 current model It consists of two areas as authorized and attacker The authorized area consists of two wireless stations associated to the access point which follow the IEEE 802. 11 ... access point and wireless stations is included in the 8021 1MgmtAP-STSF and 8021 1MgmtSTASTSF sublayers, respectively The structure of the 8021 1-ACFNC-NIC for the access point including the secure...

Ngày tải lên: 21/06/2014, 05:20

... throughputs of the BMMM protocol and our proposed MAC protocol are derived Numerical examples show that our proposed MAC protocol increases the multicast MAC performance for IEEE 802. 11 wireless ... uplink user payloads of 88 bits or 1000 bits are transmitted in IEEE 802. 11a wireless LANs, we present the results of the multicast throughputs of the BMMM and our reliable MAC protocols for n = ... IP) user payloads of 88 bits with UDP/IP headers or the user payloads of 1000 bits with TCP/IP headers, and all frames can be transmitted with the peak rate 54 Mbps of IEEE 802. 11a wireless LANs...

Ngày tải lên: 21/06/2014, 23:20

... IEEE 802. 11 networks,” in Proceedings of the IEEE Wireless Communications and Networking Conference (WCNC ’05), vol 3, pp 1589–1595, New Orleans, La, USA, March 2005 [12] HelloSoft’s family of ... Proceedings of the National Science Council, Republic of China, Part A: Physical Science and Engineering, vol 25, no 4, pp 259–268, 2001 [6] L Zhao and C Fan, “M-PCF: Modified IEEE 802. 11 PCF protocol ... 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...

Ngày tải lên: 22/06/2014, 19:20

... the performance of CSMA/ CCA Section gives the conclusions of this paper IEEE 802. 11 DCF BASED ON THE CSMA/CA PROTOCOL Figure depicts an example configuration covered by IEEE 802. 11 standards [5, ... layer, the IEEE 802. 11 specifies a basic DCF based on the CSMA/CA protocol For DCF operations, IEEE 802. 11 defines certain interframe space (IFS) intervals between successive transmissions of MAC frames ... Cali, M Conti, and E Gregori, IEEE 802. 11 wireless LAN: capacity analysis and protocol enhancement,” in Proceedings of IEEE 17th Annual Joint Conference of the IEEE Computer and Communications...

Ngày tải lên: 22/06/2014, 22:20

... modeling the performance of DCF since the standardization of IEEE 802. 11 MAC Bianchi in [5] and Wu et al in [6] use Markov chain models to analyze the throughput of 802. 11 protocol In particular, ... defined in the IEEE 802. 11 standard [2] In [7], we provide a new performance analysis of the 802. 11 protocol, which is based on the extensively-used-in-the-literature Markov chain model of [6] and ... method of estimating the number of active stations via the number of empty slots and exploits the estimated value to tune the CW parameter based on a p-persistent version of the IEEE 802. 11 protocol...

Ngày tải lên: 23/06/2014, 00:20

... analysis of the IEEE 802. 11e EDCA saturation, IEEE International Conference on Communications, (2005), pp 3450- 3454 Peng F., Peng B., and Qian D., - Performance analysis of IEEE 802. 11e enhanced ... characteristic parameters of IEEE 802. 11e EDCA such as CW, AIFS and virtual collision in a simple way Moreover, realistic conditions of wireless multi hop networks based on 802. 11e EDCA such as hidden ... accuracy of the proposed model; it can be used to arrange contention factors of EDCA to optimize QoS differentiation and network performance [6] [7] [8] [9] IEEE, - IEEE 802. 11 Part 11: Wireless...

Ngày tải lên: 13/08/2015, 10:00

... breakages We then present a protocol enhancement that enables IEEE 802. 11 MAC protocol to alleviate false route breakages Our scheme is a simple modification to IEEE 802. 11 MAC protocol and hence the ... present a protocol enhancement that enables IEEE 802. 11 MAC protocol to alleviate false route breakages due to RTS transmission failures Our scheme is a simple modification to IEEE 802. 11 MAC protocol ... optimum long retry limit for IEEE 802. 11 to reduce the likelihood of false route breakages Finally, in view of the limitations of the exiting proposed transport protocols, we propose a novel...

Ngày tải lên: 13/09/2015, 21:25

... method of atomic absorption spectroscopy (AAS) in the laboratory of Meteorological and hydrological stations of the Central of Vietnam Data is processed by statistical methods, comparison of the ... 35.52 ± 15.73 g (Table 2) Content of Hg accumulated in the tissues of the Meretrix meretrix is of 0.073 ± 0.046 μg/g and the tissues of the Corbicula sp is of 0.066 ± 0.044 μg/g, not significant ... Concentrations of Hg accumulated in the tissues of both species are lower than the allowing Standard of the Ministry of Health (≤ 0.5 μg/g, 46/2007/QDBYT) However, the concentration of Hg accumulated...

Ngày tải lên: 18/02/2017, 21:33

Ngày tải lên: 17/09/2012, 09:13

Ngày tải lên: 17/09/2012, 09:13

... hc) Tip sau ú l cỏc chun IEEE 802. 11a, IEEE8 02.11b, IEEE8 02.11g v mi õy nht l s i ca chun IEEE 802. 11e v IEEE 802. 11i Danh sỏch cỏc chun b chun IEEE 802. 11 * IEEE 802. 11 - The original Mbit/s ... management * IEEE 802. 11w - Protected Management Frames * IEEE 802. 11x - (reserved and will not be used) * IEEE 802. 11y - 3650-3700 Operation in USA 4.1.1.1 IEEE 802. 11b Chun 802. 11b c xõy dng ... not be used) * IEEE 802. 11m - Maintenance of the standard; odds and ends * IEEE 802. 11n - Higher throughput improvements * IEEE 802. 11o - (reserved and will not be used) * IEEE 802. 11p - WAVE -...

Ngày tải lên: 05/04/2013, 15:52

... of WLAN technologies: IEEE 802. 11a, 802. 11b, 802. 11g, and 802. 11n In addition, a brief overview of the updated security standard for IEEE 802. 11 networks, IEEE 802. 11i, is provided 2.1 IEEE 802. 11 ... earlier versions of IEEE 802. 11 In 2007, an updated version of the IEEE 802. 11 standard was released (http://standards .ieee. org/getieee802/download /802. 11- 2007.pdf), and the IEEE 802. 11i amendment ... a variety of malicious attacks Another threat to legacy IEEE 802. 11 WLAN availability is the use of IEEE 802. 11n WLANs IEEE 802. 11n offers a Greenfield mode that disables IEEE 802. 11n’s backward...

Ngày tải lên: 14/02/2014, 08:20

... tất chuẩn thành phần IEEE 802. 11 sử dụng để biểu thị chuẩn 802. 11, gọi 802. 11 gốc (802. 11 legacy)     9/4/2012  Sau chuẩn, IEEE 802. 11a (băng tần 5,8 GHz) IEEE 802. 11b (băng tần 2,4 GHz), ... chuẩn WLAN Chuẩn IEEE 802. 11 thức ban hành năm 1997 IEEE 802. 11 (chuẩn WiFi) biểu thị tập hợp chuẩn WLAN phát triển ủy ban chuẩn hóa IEEE LAN/MAN (IEEE 802. 11) Thuật ngữ 802. 11x sử dụng để biểu ... Ad-hoc) 11 9/4/2012 Các chuẩn an ninh hỗ trợ IEEE 802. 11 IEEE 802. 11 (WEP) IEEE 802. 1X Wi-Fi Protected Access (WPA) Wi-Fi Protected Access (WPA2) 12 9/4/2012 Chuẩn an ninh Các phương pháp xác thực IEEE...

Ngày tải lên: 09/03/2014, 09:20

... bridge, or a router Because IEEE 802. 11 is one of the family of IEEE 802 standards, an IEEE 802. 11 frame must be translated from the IEEE 802. 11 format to the format of the other LAN This translation ... 67 67 67 68 68 69 69 69 70 70 70 IEEE 802. 11 PROTOCOLS 8.1 Overview of IEEE 802. 11 Standards 8.2 IEEE 802. 11E MAC PROTOCOL 8.2.1 Enhanced Distribution Coordination ... individual manufacturers of IEEE 802. 11 equipment Secure placement of keys int the individual stations is a discussion in IEEE 802. 11 working group WEP Details: IEEE 802. 11 provides two mechanisms...

Ngày tải lên: 09/03/2014, 13:20

Ngày tải lên: 23/03/2014, 22:20

Ngày tải lên: 28/04/2014, 10:49

... assessment of the backoff behavior of commercialIEEE 802. 11b network cards,” in Proceedings of the 26th IEEE International Conference on Computer Communications (INFOCOM ’07), pp 118 1 118 9, 2007 ... other IEEE 802. 11 models The presented model can be used in game theoretical analysis of IEEE 802. 11 networks with misbehaving nodes (similarly to [10, 13]) It can also assist in the design of new ... 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...

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 ... throughput of the IEEE dw 802. 16 MAC protocol, respectively, and S11 and S11 be the up dw uplink throughput of each IEEE 802. 11 mobile station and downlink throughput of the IEEE 802. 11 AP, respectively ... 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...

Ngày tải lên: 21/06/2014, 11:20