building wireless community networks with 802 16 standard

... to an 802.11 network 802.11b devices are not compatible with the HomeRF devices because HomeRF uses the FHSS standard 802.11 a The 802.11a standard... The acceptance of the 802.11a standard ... Popular 802 Wireless Standards STANDARD 802.11b 802.11a 802.11g 802.15.1 HomeRF Bluetooth RF BAND 2.4−GHz... acceptance in the enterprise market Several large equipment vendors have announced 802.11a ... implementations 802.11a is being compared with 802.11a like fast Ethernet is compared with Ethernet Because 802.11a operates in 5 GHz, it can coexist with 802.11b networks without causing

Ngày tải lên: 14/08/2014, 14:20

... wired networks from theft, in most cases, a well−controlled premises entry system withsafeguards against intrusion is necessary This normally includes a safe environment wherecomputers and networks ... 10Unauthenticated File−SharingMost networks are equipped with file servers that enable file− and directory−sharing amongcomputer users File servers are normally equipped with decent security to deter ... immediate risk to the Internet community is the potentiallylarge number of computers attached to the Internet with unprotected Windows networking sharescombined with distributed attack tools such

Ngày tải lên: 14/08/2014, 14:20

... properties of the 802.11b standard with the 802.11a Table 8.2: 802.11b Compared with 802.11a TECHNOLOGY STANDARD MAXIMUM SPEED FREQUENCY BAND GEOGRRAPHIC RANGE The devices based on 802.11b arrived ... available wireless LAN technologies that use the 802.11 standard Today,two major wireless LAN technology−based equipments are available, each based on an IEEEstandard These standards are the IEEE 802.11b ... (see Chapter 3 for more information on 802.11 standards) It is important to remember that the two IEEE standards, 802.11b and802.11a, are incompatible with each other A good idea is to always

Ngày tải lên: 14/08/2014, 14:20

... computer with a printer attached that isconnected with the wireless LAN Setting Up a Wireless LAN for the 802.11 Infrastructure Mode The infrastructure mode requires the presence of an 802.11−compliant ... in a wireless LAN via an AP Today, there are many differentflavors of IEEE 802.11−compliant wireless LAN APs available on the market They differ inthe standard they comply with—for example, 802.11a ... Figure 9.3 Figure 9.3: PCI wireless LAN adapter Wireless LAN Access Points (APs) Wireless LAN access points (APs) are wireless LAN devices that make up the central portion of awireless LAN that operate

Ngày tải lên: 14/08/2014, 14:20

... technologies, the 802.1X and the VPNtechnologies, let's use them to build a secure wireless LAN.Building a Secure Wireless LAN with 802.1X and VPN Technology In this example, we build a wireless LAN ... computer equipped with ORiNOCO 802.11 Silver PC Card and Windows XP Figure 10.1: A wireless LAN with 802.11 authentication support Let's walk through the steps to build our secure wireless LAN that ... Wireless LAN The 802.1X solution we are presenting here consists of a wireless LAN adapter with 802.1Xsoftware driver, an 802.11 AP with 802.1X support, and a wired LAN that is directly connected tothe

Ngày tải lên: 14/08/2014, 14:20

... example, use 802.1Xauthentication protocol for authenticating your wireless LAN users Define a Standard Configuration for APs and Wireless LAN Adapters Your wireless LAN policy must define a standard ... by unauthorized wireless LAN clients • Rogue APs Hackers may also place a wireless LAN AP within the operating range of a wireless LAN to impersonate a real AP In this case, the wireless LAN adapters ... the client's wireless LAN configuration War Driving War driving is a new activity in which hackers drive around town with a laptop computer equippedwith a wireless LAN adapter and a wireless LAN

Ngày tải lên: 14/08/2014, 14:20

... Electronics Engineers 802.11 standard is the most widely accepted and deployed wireless LAN technology today. (See Chapter 3 for more information on the IEEE 802.11 standard.) The 802.11 standard defines ... use wireless devices that emit radio signals that are not too strong. Extending Wireless LAN Security In deployment scenarios where securing wireless LANs is crucial and the 802.11−standard wireless ... defined by the 802.11 standard Part 3 of the book utilizes the knowledge that we built in Parts 1 and 2 and guides you through building secure wireless LANs using the 802.11 standard We

Ngày tải lên: 14/08/2014, 14:21

... Journal on Wireless Communications and NetworkingVolume 2010, Article ID 817961, 14 pages doi:10.1155/2010/817961 Research Article Adaptive Power Allocation in Wireless Sensor Networks with Spatially ... as battlefield monitoring and surveillance, and underwater wireless sensor networks (UWSNs) for marine environment monitoring [1, 2] A wireless sensor network (WSN) consists of spatially distributed ... sensors with high correlation with the source and low cross-correlations should be selected The procedure does not take into account the fact that even if a sensor has high correlation with the

Ngày tải lên: 21/06/2014, 17:20

... Trang 1Volume 2009, Article ID 750657, 16 pagesdoi:10.1155/2009/750657 Research Article Collaborative Area Monitoring Using Wireless Sensor Networks with Stationary and Mobile Nodes Theofanis ... mobile sensor networks [1] Autonomous node mobility not only brings with it its own challenges, but also alleviates some of the tradi-tional problems associated with static sensor networks It is ... choose the segment with the maximum number of empty cells, that is, the segment with the maximum number of cells withG(i, j) = 0 (Alternatively, one can choose the segment with the least coverage

Ngày tải lên: 21/06/2014, 22:20

... Journal on Wireless Communications and NetworkingVolume 2007, Article ID 57054, 13 pages doi:10.1155/2007/57054 Research Article Distributed Time Synchronization in Wireless Sensor Networks with Coupled ... in this case AT1=1 and vector v in (16) reads v = 1/K ·1 This condition occurs in balanced networks [13], where i / = j α i j = 1 = i / = j α ji In sensor networks, this result is of interest ... ( =0.3, 0.7, γ =3,K =4) (a) Linear networks 1 2 3 4 5 (b) Ring net-work 3 4 5 (c) Star net-works Figure 5: The linear, ring, and star networks (K =5) three networks versus the number of nodesK

Ngày tải lên: 22/06/2014, 19:20

... WSNs 161 6.1 Introduction 161 6.2 Architecture 162 6.2.1 Monolithic 162 6.2.2 Micro-kernel 163 6.2.3 Virtual Machine 164 6.3 Execution Model 165 6.3.1 Event-based OS 165 ... Trang 2BUILDING WIRELESS SENSOR NETWORKS Trang 4Boca Raton London New York CRC Press is an imprint of theBUILDING WIRELESS SENSOR NETWORKS THEORETICAL & PRACTICAL ... Monolithic OS 163 6.2 Micro-kernel OS 164 6.3 Virtual machine-based OS 166 6.4 A simple event-driven execution model 167 6.5 A simple thread-driven execution model 168 6.6 (a) Thread

Ngày tải lên: 20/10/2021, 21:48

... protocol for IEEE802.16 The IEEE802.16 standard defines two layers: MAC protocol and physical layer (PHY) [16] The IEEE802.16 MAC protocol is designed for point to multipoint broadband wireless access ... point 2.4 IEEE802.16 Standard for BFWA System The IEEE802.16 family of standards promises to deliver high data rate over large areas to a large number of users in near future The first standard, ... considering IEEE802.16 to compliment and compete with ADSL in areas that are underserved or lacking in broadband service Sooner or later, IEEE802.16 will become a realistic broadband fixed wireless

Ngày tải lên: 21/06/2014, 18:20

... Improved range and in-building penetration ► Multipath effects may be significant Trang 7IEEE 802.16 Standard802.16 802.16d/HiperMAN 802.16e Completed December 2001 June 2004 (802.16d) Es timate 2005 ... MAC/Physical layer enhancements to support  subscribers moving at vehicular speeds 802.16 Dec 2001 802.16a Jan 2003 802.16d Oct 2004 802.16e Dec 2005 Trang 6Characteristics of 802.16 Frequency Ranges 10 - 66 GHz ► Short wavelength ... the 802.16 standard  Develops “system profiles” that define mandatory and optional features of standard IEEE® 802.16e Mobile Broadband Wireless Amendment IEEE® 802.16-2004 Fixed Broadband Wireless

Ngày tải lên: 05/07/2022, 13:27

... Trang 1Wireless Networks Lecture 43 IEEE 802.16 MAC/QoS Dr Ghalib A Shah Trang 2 Burst profiles Trang 4(CS) MAC Common Part ... (allows for not polling terminals with UGS-only services) Trang 27Uplink Services - RTPS Trang 28Uplink Service - NRTPS Intended for non-real-time service flows with better than best effort service ... 3-bit Fragmentation Sequence Number (FSN) • Required to detect missing continuing fragments Trang 16Packing thereof) into a single MAC PDU bandwidth Trang 17fixed length MAC SDU length = nfixed

Ngày tải lên: 05/07/2022, 13:28

... Routing with Compression in Wireless Sensor Networks SUNDEEP PATTEM, BHASKAR KRISHNAMACHARI, and RAMESH GOVINDAN University of Southern California The efficacy of data aggregation in sensor networks ... [Computer-Communication Networks]: Network Architecture and Design—Distributed networks; I.6 [Simulation and Modeling] General Terms: Design, Performance Additional Key Words and Phrases: Sensor networks, ... Krishnamachari, B., and Govindan, R 2008 The impact of spatial correlation on rout-ing with compression in wireless sensor networks ACM Trans Sens Netw 4, 4, Article 24 (August 2008), 33 pages DOI = 10.1145/1387663.1387670

Ngày tải lên: 28/04/2014, 13:41

... to 1,826 bytes using S-LZW-MC32 with a block size of 416 bytes Using the power consumption values from Table 1, we can calculate the energy required with and without compression The time to decompress ... to 1,826 bytes using S-LZW-MC32 with a block size of 416 bytes Using the power consumption values from Table 1, we can calculate the energy required with and without compression The time to decompress ... sensor networks ACM Trans Sensor Networks, 4, 1, Jan 2008, pp 1-38, ISSN:15504859 Kulkarni, S & Wang, L (2009) Energy-efficient multihop reprogramming for sensor networks ACM Trans Sensor Networks,

Ngày tải lên: 20/06/2014, 07:20

... IEEE 802.15.4 wireless sensor networks Mu-Sheng Lin1*, Jenq-Shiou Leu1, Wen-Chi Yu1, Min-Chieh Yu1and Jean-Lien C Wu2 Abstract Multimedia services over resource constrained wireless sensor networks ... min_th Accepted with probability 1 Accepted with probability 1 min_th ≦ avg_q < k Accepted with probability 1 Rejected with drop probability P loss, nrt k ≦ avg_q < max_th Rejected with drop ... Figure 1 Multimedia service over IEEE 802.15.4 wireless sensor networks. Trang 3consumption using the beacon-enabled and non-bea-con-enabled mode in IEEE 802.15.4 WSNs Distinct network topologies

Ngày tải lên: 20/06/2014, 22:20

... results for the IEEE 802.16 m evaluation methodology, mixed mobility results, technology evolution IEEE 802.16e × SUMIMO IEEE 802.16e × SUMIMO IEEE 802.16 m × MUMIMO IEEE 802.16 m × MUMIMO Average ... (January 2009) IEEE Std 802.16-2009, IEEE Standard for Local and metropolitan area networks—Part 16: Air Interface for Broadband Wireless Access Systems IEEE 802.16m-07/002, IEEE 802.16m System Requirements ... Document (SRD) IEEE 802.16m-09/0034, IEEE 802.16m System Description Document (SDD) A Papathanassiou et al., IEEE 802.16m evaluation results for the PCT of IMTdvanced, document IEEE C802.16-0013 (September

Ngày tải lên: 21/06/2014, 01:20

... associatedwith them In the standard of IEEE 802.16j-2009, packetconstruction and delivery mechanism are inherited fromIEEE 802.16/16e standard The new multi-hop wirelessnetwork is called IEEE 802.16-MR ... mobile wireless net-work service to mobile users Considering user mobility, IEEE 802.16e [7], 802.16-2009 [8], had also been completed to support wireless access with high mobility.However, IEEE 802.16e/802.16-2009 ... has launched a standardization process called Wireless Metropolitan Area Network (Wireless MAN™) for Broadband wireless access (BWA) BWA technology based on IEEE 802.16d (802.16-2004) [6] has

Ngày tải lên: 21/06/2014, 03:20

... Introduction IEEE 802.16 standards family defines an air interface for Broadband Wireless Access (BWA) system As the result of a recent revision, the contemporary core standard IEEE 802.16-2009 [1] ... 802.16-2009 [1] consolidates the IEEE 802.16-2004 standard with several amendments According to [2], this wireless interface is recommended for Wireless Metropolitan Area Networks (WMANs) The high-speed ... Connection response undefined by IEEE 802.16Admission control Base station (BS) Uplink packet scheduling algorithm undefined by IEEE 802.16 Figure 3: IEEE 802.16 QoS architecture Polling cycle=

Ngày tải lên: 21/06/2014, 05:20