... thức IEEE 8 02. 11 mô hình OSI .25 Hình 2.2 Mô hình kiến trúc theo chuẩn 8 02. 11 .26 Hình 2. 3: Các lựa chọn chuẩn 8 02. 11b 28 Hình 2. 4 Định dạng frame quy định FHSS 8 02. 11 PHY ... thức IEEE 8 02. 11 mô hình OSI .25 Hình 2.2 Mô hình kiến trúc theo chuẩn 8 02. 11 .26 Hình 2. 3: Các lựa chọn chuẩn 8 02. 11b 28 Hình 2. 4 Định dạng frame quy định FHSS 8 02. 11 PHY ... thức IEEE 8 02. 11 mô hình OSI .25 Hình 2.2 Mô hình kiến trúc theo chuẩn 8 02. 11 .26 Hình 2. 3: Các lựa chọn chuẩn 8 02. 11b 28 Hình 2. 4 Định dạng frame quy định FHSS 8 02. 11 PHY...
... adapt and copy a portion of the specification as the base material for 8 02. 15.1 • 8 02. 15.1 standard – Approved in March 2, 20 02 – Fully compatible with Bluetooth version 1.1 Bluetooth Protocol Stack ... speed RF WPANs • Offer functionality beyond that of IR devices • Include – Bluetooth – 8 02. 15.4 (ZigBee) IEEE 8 02. 15.1 and Bluetooth • Industry specification – Bluetooth Special Interest Group (SIG) ... at a speed of up to Mbps Bluetooth version 2. 0 transmits at or Mbps 10 Bluetooth Protocol Stack (continued) 11 Bluetooth Protocol Stack (continued) 12 Bluetooth Protocol Stack (continued) 13 Bluetooth...
... two standards – IEEE 8 02. 15.3 and 8 02. 15.5 • IEEE 8 02. 15.3 standard – Defines the specifications for HR WPANs supporting speeds of 11, 22 , 33, and up to 55 Mbps • In the 2. 4 GHz ISM band Wireless# ... with 8 02. 11a networks • ZigBee and WiMedia products should be able to coexist with 8 02. 11b/g without any serious problems Wireless# Guide to Wireless Communications 42 Summary • IEEE 8 02. 15.3 -20 03 ... them Wireless# Guide to Wireless Communications 21 Additional MAC Layer Functionality (continued) Wireless# Guide to Wireless Communications 22 Additional MAC Layer Functionality (continued)...
... thức thăm dò Trong Hình 3 .21 trạm Lan nằm phạm vi AP trạm AP thuộc dịchvụ quảng cáo, AP lại thuộc dịchvụ bán hàng Trạm Lan thiết lập cho dịchvụ quảng cáo 37 Hình 3 .21 Quan hệ trạm Lan AP lân ... IBSS • Cấu trúc dịchvụ - BSS • Cấu trúc dịchvụ mở rộng - ESS 12 Một cấu trúc dịchvụ tập hợp thiết bị logical WLANs cung cấp truy cập mạng tín hiệu broadcasting thông qua tần số sóng mang (RF) ... máy tính, truyền thông, công nghệ điện, điện tử với mạng LAN Cho đời chuẩn có tên gọi dự án 8 02 : 8 02. 3; 8 02. 4; 8 02. 5; 8 02. 11 Trong 8 02. 11 chuẩn cho mạng cục không dây, có nhiệm vụ định nghĩa các...
... unused wires in a standard UTP Ethernet cable 11 WLAN Modes • Ad hoc mode • Infrastructure mode 12 Ad Hoc Mode • Also known as peer-to-peer mode – Formal name: Independent Basic Service Set (IBSS)...
... – LMDS used the following ranges of frequencies • 27 .5 MHz and 28 .35 MHz • 29 .1 MHz and 29 .25 MHz • 30 GHz, 31.075 GHz, and 31 .22 5 GHz • Architecture – Cells (like a cellular telephone system) ... 12 Local Multipoint Distribution Service (LMDS) (continued) • Frequency – Based on high frequency, low-powered signals over short distances – LMDS used the following ranges of frequencies • 27 .5 ... sharing Security Availability of the technology 17 IEEE 8 02. 16 (WiMAX) • Standard for wireless broadband metropolitan area networks • 8 02. 16 supports enhancements and extensions to the MAC protocols...
... FDMA and TDMA technologies 14 2. 5 Generation Cellular Telephony • 2. 5 Generation (2. 5G) – – – – Interim step between 2G and 3G Operates at a maximum speed of 384 Kbps 2. 5G networks are packet-switched ... CDMA2000 1xEVDO • For 2. 5G CDMA2000 1xRTT networks 17 Third Generation Cellular Telephony (continued) • 3G network technologies (continued) – CDMA2000 1xEVDV will be the successor of CDMA2000 ... latitudes – Orbits typically have a 24 -hour period 38 Geosynchronous Earth Orbit (GEO) • Geosynchronous earth orbit (GEO) satellites – Stationed at an altitude of 22 ,28 2 miles – Orbit matches the rotation...
... ta khai báo thêm sốthôngsố bấm vào nút Advanced • Số email gửi lần • Số người nhận email • Đối chiếu với danh sách người gửi Privacy: Các thiết lập cho mục Privacy nhằm bảo vệ thông tin riêng ... Program Control: Cho phép ta thiết lập thôngsố nhằm kiểm soát việc thực thi chương trình máy tính nhằm tránh xâm nhập trái phép từ hacker tránh rò rỉ thông tin từ chương trình bí ẩn • Medium: ... vào Internet Email Protection: Mục nhằm bảo vệ an toàn cho hệ thống thư điện tử Ta thiết lập thôngsố cho mục: • Inbound MailSafe protection : Bảo vệ an toàn máy tính theo cách không cho...
... Proceedings of the IEEE, October, 20 00, pp 16 62 1676 [16] Lansford J HomeRF: A Wireless Voice and Data System for the Home, in Proceedings of IEEE ICASSP, 20 00, pp 3718–3 721 Further reading [1] Wireless ... piconet However, the use of a 2/ 3 FEC code in HV2 packets reduces the voice information carried in the SCO packets to 20 bits Twenty voice bits are produced every 2. 5 ms resulting in the need ... differences between HomeRF versions 1 .2 and 2. 0 was released in 20 01 This version offers significantly higher data rates (up to 10 Mbps) than the previous version 1 .2 [15,16] and is backwards compatible...
... 1996 27 2 Wireless Networks [ 12] Kahol A., Khurana S and Jayasumana A P Effect of Hidden Terminals on the Performance of IEEE 8 02. 11 MAC Protocol, in Proceedings of IEEE LCN 98, 1998, pp 12 20 [13] ... 5.15 to 5 .25 GHz with devices that use this band producing 50 mW output signals The ‘middle’ band is in the 5 .25 –5.35 GHz band with a maximum of 25 0 mW The ‘high’ band utilizes 5. 725 –5. 825 GHz, ... propagation 9.6 .2 8 02. 11b Another recent development is the IEEE 8 02. 11b specification Like 8 02. 11a, it is also a specification for the physical layer It operates in the unlicensed 2. 4 GHz band The...
... Networking 20 11, 20 11:58 http://jwcn.eurasipjournals.com/content /20 11/1/58 Page 10 of 12 5.4 ) 5.3s b p M 5 .2( T 5.0 h r o u g 5.1 h p u t tneilC redivorP rehtO noitageled o/w 0001 008 006 004 0 02 Δ ... Proceedings of ISCC 20 04, 760–765 (July 20 04) 10 J Valdez, M Guirguis, Liberating TCP: the free and the stunts, in International Conference on Networking, 20 08, ICN 20 08, 72 77 (Apr 20 08) 11 P Liu, ... sKCA rof tiaW eurT dnar > β 2/ vcW ot cW esaerceD 2/ vpW ot pW esaerceD 2/ vcW = vcW teS 2/ vpW = vpW teS tekcap dneseR stekcap dneS v W esaercnI c tekcap dneseR v 2/ pW ot pW esaerceD eurT dnar...
... no 22 5938 and the project SENSEI with Grant no 21 5 923 References [1] N Davies, D P Siewiorek, and R Sukthankar, “Activity-based computing,” IEEE Pervasive Computing, vol 7, no 2, pp 20 – 21 , 20 08 ... ports 1 92 µs — Computes the energy in a frequency band from FFT data 20 0 µs 12 Computes a 32 bit real-valued FFT over a data window of n = 2k samples (exec time for FFT 186 ms 16 + 4n + ns 128 16-bit ... 12 + ns Merge Merges multiple packets into one 328 µs 12 MinMax Looks for the maximum and minimum in a window of size n 193 µs ExpAvg Computes an exponential moving average over input data 22 2...
... adaptation for IEEE 8 02. 11 a wireless LANs,” IEEE Transactions on Mobile Computing, vol 1, no 4, pp 27 8 29 2, 20 02 [22 ] J D P Pavon and S Choi, “Link adaptation strategy for IEEE 8 02. 11 WLAN via received ... the Aiming for the Top University and Elite Research Center Development Plan, NSC 96 -22 21- E-009-016, NSC 98 -22 21- E-009-065, the MediaTek research center at National Chiao Tung University, the Universal ... (Mbps) 25 20 15 25 20 15 10 10 5 20 40 60 80 Number of aggregated MPDUs 20 40 60 80 Number of aggregated MSDUs BER= BER= 1E − BER= 4E − BER= 8E − BER= 2E − BER= BER= 1E − BER= 4E − BER= 8E − BER= 2E...
... calculated using (20 ) to (25 ) The average power consumption for transmitting the data packet and receiving the Ack packet can be calculated using (21 ) and (22 ) (20 ) (21 ) (22 ) Power consumed due ... SENSORCOMM ’08, Cap Esterel, France, 20 08, pp 20 9 21 6 [2] IEEE 8 02. 15.6, Application summary, 15-08-0406-00-0006-tg6-applicationsmatrix.xls, 20 08 [3] IEEE 8 02. 15.6, Technical requirement documents ... Biomed 13(6), 915– 925 (20 09) [13] M Miller, N Vaidya, A MAC protocol to reduce sensor network energy consumption using a wakeup radio IEEE Trans Mobile Comput 4(3), 22 8 24 2 (20 05) [14] I Demirkol,...