qos issues in ad hoc wireless networks pdf

... protocol,” in Ad Hoc Networking, pp 173–219, Addison-Wesley, Reading, Mass, USA, 2001 [2] D B Johnson, D A Maltz, and J Broch, “DSR: the dynamic source routing protocol for multi-hop wireless ad hoc networks,” ... U Baroudi, “Bypass-AODV: improving performance of ad hoc on-demand distance vector (AODV) routing protocol in wireless ad hoc networks,” in Proceedings of the International Conference on Ambient ... from performance degradation in high-speed conditions 1 Introduction Research has gained a significant advance in the develop-ment of routing protocols for wireless ad hoc networks [1, 2] The

Ngày tải lên: 21/06/2014, 11:20

... of single-hop wireless local area networks (WLANs) Although often used in practical implementations of mobile ad hoc networks, IEEE 802.11 presents several drawbacks in the context of ad hoc networks, ... unfairness in providing access to the common channel [3], [4, Chapter 16] Throughput performance degradation of IEEE 802.11 in the presence of fading channels has been studied in detail in [5] In this ... fair throughput share can be maintained in a single-hop network IEEE 802.11 also maintains fairness which is preserved in a single hop network 5.1.2 Channel Prediction Inaccuracy As we discussed

Ngày tải lên: 21/06/2014, 22:20

... QoS provisions in ad hoc networks, such as QoS routing or admission con- trol [1–4]. Most of the existing works deal with resource al- location (e.g., scheduling or buffering) or routing for QoS ... cation in ad hoc wireless networks, such as in [15, 16]. Sing et al. studied five different metrics of energy-efficient routing in [16], such as minimizing energy consumed per packet, min- imizing variance ... times of calling the QoS routing algorithm in step (c), we use the binary search method to find the QoS topology, instead of adding an edge each time and running the routing algorithm. In this algorithm,

Ngày tải lên: 22/06/2014, 22:20

... balancing energy among nodes in the networks Trang 2Keywords: wireless sensor networks; minimum connected dominating set; minimum-energy broadcast problem; network lifetime maximization 1 Introduction ... proposed for broadcasting DB (distance based) was one of the schemes used to minimize the effects of the broadcast storm problem when disseminating information in wireless networks [2] It made use of ... for Broadcasting in Ad Hoc Wireless Sensor Networks Naixue Xiong 1,2 , Xingbo Huang 3 , Hongju Cheng 3, * and Zheng Wan 1 1 School of Information Technology, Jiangxi University of Finance

Ngày tải lên: 02/11/2022, 09:22

... accuracy, we adap-tively adjust the time windows by applying the reinforcement learning mechanism from the beginning of the whole procedure Reinforcement learning is a machine learning technique ... an algorithm based on reinforcement learning, called WINTER (WINdow adjusTment with Expanding and shRinking), which adap-tively adjusts the time window size by the following: (i) If the prediction ... of the time windows consists of two operations: expanding, that is, increasing the window size by one time point, and shrinking, that is, decreasing the window size by one time point The collector

Ngày tải lên: 21/06/2014, 18:20

... SCTP in Wireless Networks Jen-Yi Pan,1Min-Chin Chen,1Ping-Cheng Lin,1, 2and Kuo-Lun Lu1 1 Department of Communications Engineering, National Chung Cheng University, 168 University Road, Min-Hsiung, ... control adjusts the congestion window size in wireless network due to other factors instead of network congestion, then performance falls Huang and Tsai [8] focused on handover issues while adopting ... Packet loss in wired networks is mainly the result of network congestion SCTP congestion control must adjust the congestion window size Conversely, packet loss in a wireless network is mainly from

Ngày tải lên: 21/06/2014, 18:20

... connections admitted in the system, admission capacity planning needs to take into account the SNR fluctuations In this paper, we propose new methods for admission capacity planning in orthogonal ... high-performance physical layer in emerging cellular networks OFDMA is based on OFDM and inherits immunity to inter-symbol interference and frequency selective fading Recently, adaptive resource management ... research interest [1 7] In [1], the authors studied how to minimize the total transmission power while satisfying a minimum rate con-straint for each user The problem was formulated as an in-teger

Ngày tải lên: 22/06/2014, 22:20

... Active research is going on in the field of routing in ad hoc sensor networks. A lot of development has been seen in ad hoc routing since the introduction of highly dynamic destination-sequenced ... received his B.E. degree in electrical engineering from Thapar Insti- tute of Engineering and Technology, India, in 2001. He received his M.S. degree in elec- trical engineering from Wichita State ... savings in an ad hoc wireless environment. Low mobil- ity was simulated by increasing the pause time of nodes in the random waypoint mobility model. The maximum speed was set to 3 m/s and minimum

Ngày tải lên: 23/06/2014, 00:20

... routing in ad hoc networks,” IEEE J Select Areas Commun., vol 17, no 8, pp 1488–1505, 1999 [4] B Das and V Bharghavan, “Routing in ad-hoc networks us-ing minimum connected dominatus-ing sets,” in ... challenging issue in mobile ad hoc networks, especially when there are multiple QoS con-straints In this paper, we propose an adaptive QoS routing scheme supported by cross-layer cooperation in ad hoc ... stability-based adaptive routing (SSA) for ad hoc mobile net-works,” IEEE Pers Commun., vol 4, no 1, pp 36–45, 1997. [10] Q Xue and A Ganz, “Ad hoc QoS on-demand routing (AQOR) in mobile ad hoc networks,”

Ngày tải lên: 23/06/2014, 00:20

... as sacrifices for disseminating keying information to worker sensors in the vicinity Worker sensors are in charge of normal network operations such as sensing and reporting Two worker sensors ... summarized inSection 2 Preliminaries, models, and assumptions are sketched inSection 3 The in-situ key establishment framework is introduced inSection 4, and the three instantiations are outlined in ... Figure 1: Existing Key Establishment Schemes - A Taxonomy most of the research interests in securing sensor networks The probabilistic-based schemes require each sensor to preload keying information

Ngày tải lên: 21/06/2014, 20:20

... reliable downstream data delivery in wireless sensor networks,” in Proceedings of the ACM International Symposium on Mobile Ad Hoc Networking and Computing (MobiHOC ’04), pp 78–89, Roppongi Hills, ... event-to-sink reliable transport in wireless sensor networks,” in Proceedings of the ACM International Symposium on Mobile Ad Hoc Networking and Computing (MobiHOC ’03), pp 177– 188, Annapolis, ... D Kotz, “On improving wireless broadcast reliability of sensor networks using erasure codes,” in Proceedings of the 2nd International Conference on Mobile Ad-hoc and Sensor Networks (MSN ’06),

Ngày tải lên: 21/06/2014, 22:20

... benefits of beamforming techniques in ad hoc networks We first devise a novel MAC paradigm for ad hoc networks when using these techniques in multipath fading environment In such networks, the use ... model, by introducing the fading probability, to derive the saturation throughput for our proposed MAC when the simplest beamforming strategy is used in real multipath fading ad hoc networks Finally, ... reproduction in any medium, provided the original work is properly cited 1 Introduction Ad hoc networks seem to be a promising solution for wireless access networks in beyond 3G system Tradition-ally,

Ngày tải lên: 21/06/2014, 22:20

... Research Article Handoff Triggering and Network Selection Algorithms for Load-Balancing Handoff in CDMA-WLAN Integrated Networks Jang-Sub Kim, Erchin Serpedin, Dong-Ryeol Shin, and Khalid Qaraqe Department ... standard body that developed and maintained GSM, GPRS, and UMTS, initiated the specification of interworking architecture for WLAN and 3GPP systems In [7], six interworking scenarios have been identified ... (ii) the number of handoffs should be minimal since excessive handoff results in signal quality degradation increased traffic dropping probability and additional loads on the network; (iii) the handoff

Ngày tải lên: 22/06/2014, 00:20

... reproduction in any medium, provided the original work is properly cited 1 INTRODUCTION Streaming video applications are involved in an increasing number of communication services The need of interoper-ability ... assignment In this study, we adopt an adaptation framework in which the streaming server sends scalable layers as multiple RTP substreams that are combined into a single RTP stream, adapted to ... considering that streaming session Scheduling opportunities for this packet will be inspected only if its reception deadline is not past and still available before reaching this deadline as follows:

Ngày tải lên: 22/06/2014, 01:20

... coverage in partitionable mobile ad hoc networks, ” in Proceedings of the 21st Annual Joint Conference of the... the modeling characteristics above showing that in certain cases ... data acting as routers. However, in these networks, u ser mobility adds problems that should be addressed, mainly due to the dynamism of the network topology, diminishing communication link lifetime. ... resenting not only patterns with only one increment in the x and y coordinates (e.g., the SIMM model), but also with several increment values in these coordinates, with a smooth variation in this increment.

Ngày tải lên: 22/06/2014, 19:20

... power constraint, the minimal receive signal-to-interference-plus-noise ratio (SINR) constraints at the destination nodes, and the minimal receive power constraints at the unintended destination nodes ... [13,14] In [15], the power optimization issue and also the beamforming at the relay side have been addressed in ad hoc wireless networks The cooperative beamforming con-cept and power efficiency issues ... destina-tion nodes 2.1 Cooperative multiple beamforming Cooperative beamforming consists of two stages, local broadcasting and cooperative transmission In particular, in local broadcasting,

Ngày tải lên: 22/06/2014, 19:20

... authentication, clustering, cluster head, ad hoc network, multilayer. 1 INTRODUCTION Mobile ad hoc networks consist of devices that are au-tonomously self-organized into networks In ad hoc net-works, ... reproduction in any medium, provided the original work is properly cited. Mobile ad hoc networking is one of the most innovative and challenging areas of wireless networking Ad hoc networks are ... security threats against ad hoc routing proto-cols, specifically examining cluster-based routing Our proposed protocol, called “authentication based on multilayer clustering for ad hoc networks” (AMCAN),

Ngày tải lên: 23/06/2014, 00:20

... factors. Combinatorial stability is an essential consideration for attaining QoS objectives in an ad hoc network, as we shall see below. I address the general issue of routing in mobile ad hoc networks ... OF SERVICE IN AD HOC WIRELESS NETWORKS Ensuring secure transmission and good quality of service (QoS) are key commercial concerns in ad hoc wireless networks as their application in short range ... the wire-line networks have been developed and implemented in wireless cellular networks. To make ad hoc networks secure, we need to find ways to incorporate some of these schemes of wireless...

Ngày tải lên: 25/03/2014, 12:07

... Designs in Ad Hoc Wireless Networks Y u-Chee Tseng and Ting-Yu Lin 5 P erformance Analysis of Wireless Ad Hoc Networks A nurag Kumar and Aditya Karnik 6 C oding ... Chua Kee Chaing, and Seah Khoon Guan Winston 29 Scheduling of Broadcasts in Multihop Wireless Networks Jang-Ping Sheu, Pei-Kai Hung, and Chih-Shun Hsu 30 Security in Wireless Ad Hoc Networks — ... tree/state maintenance: the state and reservation kept at each node periodically time out. The main issues in providing QoS multicasting in mobile ad hoc networks are (1) locating a QoS route...

Ngày tải lên: 03/06/2014, 01:08

... have the same weight, in addition to service differentiation in the other case. 6.1.2 Performance in the presence of link errors In order to handle wireless link errors within TaLE fra- mework, ... LANs, in Proceedings of Workshop on Resource Allocation in Wireless Networks (RAWNET) (2006) 12. N Blefari-Melazzi, A Detti, I Habib, A Ordine, S Salsano, TCP fairness issues in IEEE 802.11 networks: ... respectively, to minimize queue length error accord ing to the tuning technique specified in [39], and the interv al of monitor- ing per-location load T ω r , and that of updating network- wide load T ω  are...

Ngày tải lên: 20/06/2014, 22:20