wireless multiple access protocol in mobile computing

... attracted growing interest in the research and commercial community Wireless devices are becoming smaller with lots of embedded computing capabilities In addition, mobile computing, which is ... check pointing; thereby reducing the number of checkpoints to be taken Authors’ approach offers advantage particularly in the case of mobile computing systems where both non-block check pointing ... test Also, recent mobile network technologies such as algorithms, decreasing energy consumption in mobile network, and fault tolerance in distributed mobile computing are the main concern of the

Ngày tải lên: 27/06/2014, 00:20

... towards the merging of wireless communications and based data communications, including their impact on multiple access strategies for mobilecommunications Indeed, in tune with the increasing importance ... themain topic of this book Accordingly, its starting point was the Ph.D thesis It was thensubstantially expanded to cover multiple access in GSM/GPRS and in UMTS, as well as latest trends in the industry ... Duplexing 264 6.3.2 TDD with Alternating Uplink and Downlink Slots 266 6.3.3 MD FRMA for TDD with a Single Switching-Point per 6.4.1 The Concept of Channel Access Functions 267 6.4.2 Downlink Signalling

Ngày tải lên: 20/04/2023, 09:32

... ( Mobile IP and Wireless Access Protocol ) 12.1 IP Di Đông ( Mobile IP ) 12.2 Giao thức Ứng dụng Không dây ( Wireless Application Protocol ) 12.3 Bài đọc trang web đề xuất ( Recommended Readings ... máy tính xách tay máy tính di động khác, Mobile IP phát triển phép máy tính trì kết nối Internet chuyển từ điểm đính kèm Internet sang điểm đính kèm Internet khác Mặc dù IP di động hoạt động ... để xác thực tin nhắn Người gửi chèn mã vào tin nhắn khóa bí mật chung Người nhận sử dụng mã để đảm bảo tin nhắn không bị thay đổi trì hỗn Trình xác thực bảo vệ tồn yêu cầu đăng ký tin nhắn trả

Ngày tải lên: 22/12/2022, 16:07

... power spent in the sensing state In fact, in our protocol, the time during which sensors are in a sens-ing state is high, so if in this state they spend the same en-ergy as in the receiving state ... ROUTING PROTOCOL—LEACH B+ We propose a new routing strategy which combines LEACH B [18] with a simple single-path routing protocol, which in-cludes the direct transmission to the final sink, ... energy inefficiency In [19], a self-organization protocol for WSNs called self-organizing medium access control for sensor net-works (SMACS) is proposed Each node maintains a TDMA-like frame in which

Ngày tải lên: 23/06/2014, 00:20

... multiuser scheduling for a system described inSection 2is that, under pure Rayleigh fading, multiuser scheduling has a vanishing relative schedul-ing gain as m and N increases (indicating a tradeoff ... shadowing,ρ =0 dB Round-robin, shadowing,ρ =0 dB Round-robin, no shadowing,ρ =0 dB Scheduling, shadowing,ρ = −10 dB Round-robin, shadowing,ρ = −10 dB Round-robin, no shadowing,ρ = −10 dB Figure 7: ... following proposition Proposition 2 For a given throughput constraint ∆, if ∆ ≤ Λ(∞ ), the minimum e ffective energy jointly optimized over a and ρ is given by E e,min =min a E e,min(a) =min ρ ≥ ρmin

Ngày tải lên: 23/06/2014, 00:20

... in such way that each signal can be received without interference from another CCU Wireless Access Tech Lab Wireless Access Tech Lab Introduction (2) CCU Wireless Access Tech Lab Wireless Access ... bidirectional communication CCU Wireless Access Tech Lab Wireless Access Tech Lab Introduction (4) CCU Wireless Access Tech Lab Wireless Access Tech Lab Frequency Division Multiple Access (FDMA) (1) Each ... CCU Wireless Access Tech Lab Wireless Access Tech Lab Frequency Division Multiple Access (FDMA) (2) Allocation of separate channels to FDMA signals CCU Wireless Access Tech Lab Wireless Access

Ngày tải lên: 11/07/2014, 21:20

... to support pervasive computing Recent advances in wireless and mobile computing, and inexpensive, portable devices have resulted in the emergence of indoor wireless networks ... in a retrieval system or transmitted in any form or by any means, electronic or mechanical, including uploading, downloading, printing, decompiling, recording or otherwise, except as permitted ... Energy-Efficient Prefix Sums Protocols 200 9.5 Initializing a Single-Channel RN 202 9.6 Initializing a k-Channel RN 207 9.7 Energy-Efficient Initialization Protocols 208 9.8 Concluding Remarks and Open

Ngày tải lên: 13/08/2014, 12:21

... of pag-ing increases with the size of the vicinity in which the paging is performed Associatingwith each reporting cell a weight that reflects the frequency that mobile subscribers enterinto that ... update and paging Paging isperformed by the network to find the cell in which a mobile station is located so the in-coming call for the mobile station can be routed to the corresponding base station ... ensuring that the spectrum assigned for use in mobile communi-cations will be optimally utilized is gaining ever-increasing importance This makes the ca-51 Handbook of Wireless Networks and Mobile

Ngày tải lên: 13/08/2014, 12:21

... the protocols that define and control access to the wireless channel, i.e., wirelessmedia access protocols (MAC) protocols We start by highlighting the distinguishing char-acteristics of wireless ... MAC PROTOCOLS 125 Figure 6.4 Frequency division multiple access Figure 6.5 Time division multiple access 2 Time Trang 23with each node taking turns accessing the channel Since each node has access ... type of constraint forbids the use of certain chan-nels in certain cells Such constraints may be external, resulting from interference withother systems, or internal, when an existing assignment

Ngày tải lên: 13/08/2014, 12:21

... due to additional indexing informa- tion. As such, there is a trade-off between access time and tune-in time. Several indexing techniques for wireless data broadcast have been introduced to conserve ... for a mobile environment based on dynamic chunking, in Proceedings of the 20th IEEE International Conference on Distributed Computing Systems (ICDCS’2000), pp 52 2 52 9,... beginning of ... noted that by extending the leader election protocols for single-hop radio networks discussed in this chapter, one can obtain clustering protocols for multihop radio networks, in which every cluster

Ngày tải lên: 13/08/2014, 12:21

... three chains suggests that a combined ECL > 1 500 is enough for obtaining marginal densities sufficiently accurate for most practical applications With increasing sample size computing time ... to increase nearly linearly for both procedures, Gibbs sampling... required for computing the eigenvalues k of T increases quadratically with increasing k The evaluation of the marginal ... marginalizing the joint posterior density of variance components. Analytical integration is possible only for certain parameters in simple univariate models, eg, for obtaining

Ngày tải lên: 14/08/2014, 15:21

... used in a reference subchannel in a reference cell are distributed in different subchannels in the reuse cells The subcarriers used in a subchannel in a certain cell are unlikely to be repeated in ... MAPPING FROM SUBCARRIERSUSE OF OFDMA IN WIMAX AND LTE Subcarriers are the smallest granular units in the frequency domain, OFDM symbol duration is the smallest granular unit in the time domain in ... gives two potential starting points in the frame as there are two PSS transmissions in the frame Trang 10NETWORK ENTRY NETWORK ENTRY STEPS IN WIMAX AND LTE In WiMAX, a mobile has to search for

Ngày tải lên: 24/07/2015, 22:26

... gọi bin, hình Mỗi bin có sóng mang liệu sóng điều khiển, bin liền kề nhóm vào band Người dùng gửi liệu phản hồi trở lại qua băng tốt theo đánh giá họ đồng thời cập nhật thông tin sử dụng tin tin ... tối thiểu tin phản hồi 2ms, thời gian tối đa tin phản hồi 160ms Trong thông tin phản hồi không theo chu kỳ, BTS yêu cầu máy di động để báo cáo tình trạng kênh Có chế độ khác thông tin phản hồi ... Một liên kết lỏng nhiều tin nhắn, tín hiệu WiMAX LTE trình bày bảng Thông tin Khung thời gian biểu tượng, đồng hóa tần số, thơng tin tiền tố tuần hồn, CELL_ID Điều khiển tin nhắn/tín hiệu WiMAX

Ngày tải lên: 24/07/2015, 22:27

... 2.1 Introduction Interleaved frequency division multiple access (IFDMA) scheme introduced in [22] is a promising candidate for the uplink transmission in next generation mobile wireless ... “Variable Spreading Factor-OFCDM with Two Dimensional Spreading that Prioritizes Time Domain Spreading for Forward Link Broadband Packet Wireless Access,” in Proc. of IEEE VTC-Spring, vol. 1, Apr ... keying (QPSK) Sophisticated multiple access technology like frequency division multiple access (FDMA), time division multiple access (TDMA) and code division multiple access

Ngày tải lên: 08/09/2015, 18:24

... performance comparison of multi-hop wireless ad hoc network routing protocols. In Proceedings of the 4th annual ACM/IEEE international conference on Mobile computing and networking, pages 85–97. ACM, 1998. ... coverage maintenance in mobile sensor networks. In Ubiquitous Intelligence and Computing, 2007. [123] Y. Xue, Y. Cui, and K. Nahrstedt. Maximizing Lifetime for Data Aggregation in Wireless Sensor ... services in sensor networks. In Proceeding of International Conference on Mobile Ad-hoc and Sensor Systems (MASS), 2004. [131] J. Zhao, R. Govindan, and D. Estrin. Computing aggregates for monitoring

Ngày tải lên: 10/09/2015, 15:49

... MAI multiple access interference TDMA time division multiple access MF matched filtering WiMAX worldwide interoperability microwave access viii Summary In current broadband evolution of wireless ... to support multiple access in future broadband wireless systems due to its advantages over existing multi-access techniques In uplink transmission, OFDMA suffers from Inter-Carrier Interference ... Challenges 1.3 Inter-Carrier Interference Suppression in OFDMA Uplink 1.4 Outline 12 Chapter Inter-Carrier Interference in OFDMA System Uplink 13 2.1 Frequency

Ngày tải lên: 14/09/2015, 14:03

... consider following two distinct application domains in this study, i.e., DDBSs in Stationary Computing Environments (SCEs) and Mobile Computing Environments (MCEs) Traditionally, a DDBS in a SCE consists ... interconnection network Thus, in such a scenario, one of the main problems is in designing efficient policies to handle on-line requests arriving at the system with a minimum cost and maintain ... (Req is a read request) { Insert Req into win(o); } Else /* Req is a write request */ {Service the requests in win(o); /*win(o) is empty after servicing*/ Insert Req into win(o); T C o = τ ; } }

Ngày tải lên: 16/09/2015, 17:11

... “Polarization Division Multiple Access With Polarization Modulation for LOS Wireless Communications” by Bin Cao, Qin-Yu Zhang, and Lin Jin discusses a potential multiple access and modulation ... fair and efficient wireless access in challenging interference scenarios, for example, multiple networks deployed in the same geographical area and sharing a common band. In 1976, an ALOHA ... algorithm increases only linearly with the number of users. In this algorithm, the different CFOs from different users destroy the orthogonality among training sequences and introduce multiple access...

Ngày tải lên: 21/06/2014, 17:20

... extremely large in the case of unconstrained channel access, resulting in a low inherent statistical multiplexing gain. By combining CDMA with PRMA, it is possible to control the access of users ... (P loss ) max in multiples of σ K d Hamming distance d il Interleaving depth d min Minimum Hamming distance e Error correcting capability of an (L, B, e) block code; also 2.718 282 f CAF Channel access ... frequency channels) in GSM MAI Multiple Access Interference MAIO Mobile Allocation Index Offset (for frequency hopping in GSM) MBS Mobile Broadband System MCS-1 Modulation and Coding Scheme 1 (for...

Ngày tải lên: 02/03/2013, 16:59

... 3) source sink

Ngày tải lên: 28/04/2014, 13:40