ad hoc wireless networks

... Although often used in practical implementations of mobile ad hoc networks, IEEE 802.11 presents several drawbacks in the context of ad hoc networks, one of them being its poor throughput performance ... control (MAC) protocols for ad hoc networks has been dominated by the IEEE 802.11 standard, which was initially implemented in the context of single-hop wireless local area networks (WLANs) Although ... Exponential Fade Duration. We assume arbitrary distributions for both nonfade and fade durations As a special case, we consider fixedl for nonfade duration and exponentially distributed fade duration

Ngày tải lên: 21/06/2014, 22:20

... INTRODUCTION An ad hoc wireless network is a special type of wireless net- work that does not have a wired infrastructure to support communication among the wireless nodes. In multi-hop ad hoc networks, ... Krunz, “CDMA-based MAC protocol for wireless ad hoc networks,” in Proceedings of the 4th ACM In- terational Symposium on Mobile Ad Hoc Networking and Com- puting (MobiHoc ’03), pp. 153–164, Annapolis, ... mentioned above as- sume the homogenous environment of wireless networks. There are a lot more works on energy-efficient communi- cation in ad hoc wireless networks, such as in [15, 16]. Sing et al. studied

Ngày tải lên: 22/06/2014, 22:20

... Revised 15 April 2005 Wireless ad hoc sensor networks differ from wireless ad hoc networks from the following perspectives: low energ y, lightweight routing protocols, and adaptive communication ... 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 distance-vector routing (DSDV) [1]. Ad hoc on-demand ... in ad hoc wireless networks,” in Mobile Computing, vol. 353, chap- ter 5, pp. 153–181, Kluwer Academic, Boston, Mass, USA, 1996. [4] G. Kunito, K. Yamazaki, H. Morikawa, and T. Aoyama, “An ad-hoc

Ngày tải lên: 23/06/2014, 00:20

... Wireless Ad Hoc & Sensor Networks Wireless Ad Hoc & Sensor Networks Medium Access Control Application Transport Protocol ... Multiple Access – PRMA : Packet Reservation Multiple Access 4 Wireless Ad Hoc & Sensor Networks Wireless Ad Hoc & Sensor Networks Medium Access Control Application Transport Protocol ... Multiple Access – PRMA : Packet Reservation Multiple Access 4 Wireless Ad Hoc & Sensor Networks Wireless Ad Hoc & Sensor Networks Medium Access Control Application Transport Protocol

Ngày tải lên: 09/07/2014, 08:13

... these papers are designed for mobile ad hoc networks but not sensor networks Unlike sensor networks, bat-tery constraint is not a major issue of mobile ad hoc networks Therefore, only few papers ... applications, wireless sensor networks still face a number of challenges due to their particular characteristics that other wireless networks, like cellular networks or mobile ad hoc net-works ... mobile ad hoc networks, data is transmitted continu-ously and randomly so mobile device has to wake up to listen to the channel Therefore, unlike mobile ad hoc networks, the MAC design for sensor networks

Ngày tải lên: 14/12/2017, 17:47

... broadcast problem in wireless ad hoc networks Appl Soft Comput 2011, 11, 667–674 23 Hernández, H.; Blum, C.; Francés, G Ant colony optimization for energy-efficient broadcasting in ad-hoc networks ... reliability in mobile Ad Hoc networks with double coverage IEEE Trans Mob Comput 2007, 6, 148–163 27 Xu, H.; Garcia-Luna-Aceves, J.J Efficient broadcast for wireless ad hoc networks with a realistic ... Method in Ad Hoc Networks In Proceeding of the 5th Annual ICST Wireless Internet Conference, Singapore, 1–3 March 2010; pp 1–8 33 Peng, W.; Lu, X Efficient broadcast protocol in mobile ad hoc networks

Ngày tải lên: 02/11/2022, 09:22

... Protocols for Wireless Ad-Hoc NetworksTrang 11Comparison of the Maximal Spatial Throughput of Aloha and CSMA in Wireless Ad-Hoc NetworksB Blaszczyszyn, P Mühlethaler and S Banaouas Additional information ... Yihan Li Section 2 Routing Protocols for Wireless Ad-Hoc Networks 53 Chapter 3 Graph-Based Routing, Broadcasting and Organizing Algorithms for Ad-Hoc Networks 55 Li Liu, Xianyue Li, Jiong Jin, ... 5Preface VII Section 1 MAC Protocols for Wireless Ad-Hoc Networks 1Chapter 1 Comparison of the Maximal Spatial Throughput of Aloha and CSMA in Wireless Ad-Hoc Networks 3 B Blaszczyszyn, P Mühlethaler

Ngày tải lên: 14/03/2014, 21:20

... Article Cross Layer PHY-MAC Protocol for Wireless Static and Mobile Ad Hoc Networks Sylwia Romaszko and Chris Blondia Interdisciplinary Institute for Broadband Technology, University of Antwerp, ... suffers from a degradation of the throughput, which is noticeable in mobile ad hoc scenarios After all, maintaining the NPT table with “fresh” data is not realistic in a mobile ad hoc environment ... the battery life extension (thus the lifetime of a node) is an important factor in ad hoc networks In a pure wireless multihop network, nodes have a limited transmission range Depending on the

Ngày tải lên: 21/06/2014, 22:20

... with only the last hop being wireless Cellular phones and wireless networks using 802.11 (WI-FI) are examples of this Ad hoc networks are another type of wireless networks They are formed by a ... capacity of wireless networks,” IEEE Transactions on Information Theory, vol 46, no 2, pp. 388–404, 2000 [2] M Grossglauser and D N C Tse, “Mobility increases the ca-pacity of ad hoc wireless networks,” ... throughput of ad hoc networks,” IEEE Transactions on Communications, vol 52, no 11, pp 1957–1968, 2004 [5] N Bansal and Z Liu, “Capacity, delay and mobility in wire-less ad-hoc networks,” in

Ngày tải lên: 22/06/2014, 00:20

... routing algorithm is proposed for multihop CDMA wireless ad hoc networks A framework of power control with QoS constraints in CDMA wireless ad hoc networks is introduced and the feasibility condition ... wireless ad hoc networks In a wireless ad hoc network architecture, MAC protocol plays a critical role in optimizing bandwidth efficiency and resolving collisions due to the broadcast nature of wireless ... for wireless ad hoc networks,” in Proceedings of the 4th ACM International Symposium on Mobile Ad Hoc Networking & Computing (MobiHoc ’03), pp 153–164, Annapolis, Md, USA, June 2003 [2] V Kawadia

Ngày tải lên: 22/06/2014, 19:20

... many cases wireless ad hoc networks are deployed in the finite three-dimensional space In this paper, we analyze the geometrical characteristics of the three-dimensional wireless ad hoc network ... random, which makes it more difficult to analyze the performance of wire-less ad hoc networks Generally, wireless ad hoc networks can be modelled in the framework of random graph Nodes and links ... framework for analyzing the wireless ad hoc network, especially when its topology is random It is obvious that the distanced(s, t) between nodes s and t in the wireless ad hoc network is of great

Ngày tải lên: 22/06/2014, 22:20

... severely in IEEE 802.11-basedwirelessadhoc networks. We first identify two critical issues leading to the TCP performance degradation: (1) unreliable broadcast, since broadcast frames are transmitted ... message, and so forth. Unlike wired networks, it is very difficult to provide reliable broad- cast in wireless ad hoc networks due to the high bit error rate, wireless medium contention, and so ... problem in 802.11-based wireless ad hoc networks was first reported in [1], and it was further investi- gated in [2]. The TCP unfairness problem in multihop wire- less ad hoc networks was reported

Ngày tải lên: 22/06/2014, 22:20

... broadcasting/multicasting in wireless ad hoc networks. Our focus is on establishing source-initiated multicast trees to maximize network operating time in energy-limited wire- less ad hoc networks ... energy, the wireless ad hoc network will become unus- able after the batteries are drained. Consequently, energy ef- ficiency is an important design consideration for wireless ad hoc networks. Over ... is needed [1, 2]. On the other hand, the broadcast/multicast communication is also an important issue as many routing protocols for wireless ad hoc networks need this mechanism to maintain the

Ngày tải lên: 22/06/2014, 22:20

... issues in ad hoc networks As a result, it remains unclear what level of video quality can be supported by an ad hoc network Typically, for video communications over wireless ad hoc networks, ... over wireless ad hoc network are the fol-lowing (1) FEC coding, especially using RS codes, is quite effective in dealing with bursty packet losses commonly en-countered on wireless ad hoc networks ... used in assessing the performance of wireless ad hoc networks For example, in [4], a “protocol model” is used to assess the asymptotic capacity of an ad hoc wireless network operating in a limited

Ngày tải lên: 23/06/2014, 00:20

... The Future of Wireless Communication 3 1.1.1 Ad hoc networks 3 1.1.2 Wireless sensor networks 5 1.2 Challenges 7 1.2.1 Ad hoc networks 8 1.2.2 Wireless sensor networks ... progress of the current ad hoc and sensor network technology, and the main challenges that face the ad hoc/sensor network designer 1.2.1 Ad hoc networks Wireless ad hoc networks have attracted ... of mobile units equipped with radio transceivers communicate without any fixed infrastructure 1.1.1 Ad hoc networks Ad hoc networks are the ultimate frontier in wireless communication This technology

Ngày tải lên: 27/06/2014, 00:20

... for application in mobile ad hoc networks 3.4 Topology Control in the Protocol Stack A final question is left: where should topology control mechanisms be placed in the ad hocnetwork protocol stack? ... in the graph. Topology Control in Wireless Ad Hoc and Sensor Networks P Santi  2005 John Wiley & Sons, Ltd Trang 1340 THE CTR FOR CONNECTIVITY: STATIONARY NETWORKSand the only way to reduce ... layer is responsible for regulating the access tothe wireless, shared channel Medium access control is of fundamental importance in adhoc/sensor networks in order to reduce conflicts as much as possible,

Ngày tải lên: 14/08/2014, 14:20

... I (n, r, p) is connected – Randomized broadcast: Assume a certain network node u wants to broadcast a message m Performing broadcast in ad hoc networks is a nontrivial task, because of ... practical point of view, only networks with relatively low connectivity (say, below 5) are of some interest. The first study of k-connectivity that can be applied to ad hoc networks is due to Penrose. ... ‘minimal’ is intended as ‘least energy cost’ Besides Topology Control in Wireless Ad Hoc and Sensor Networks P Santi  2005... has no direct connection to any active node) The

Ngày tải lên: 14/08/2014, 14:20

... determines the granularity of what is meant by ‘every direction’ Topology Control in Wireless Ad Hoc and Sensor Networks P Santi  2005 John Wiley & Sons, Ltd Trang 5116 DIRECTION-BASED TOPOLOGY ... is made symmetric by adding the reverse edge (v, u) in the graph.1 To implement this strategy, it is sufficient that every nodeu at the end of basicCBTC advertises its neighbor set at the broadcast ... uni) using power mp u upon receiving notify message(v, add) add nodev to N (u), with associated power mp v if necessary, update the broadcast power bp u Figure 10.7 The LMST protocol Trang 3114

Ngày tải lên: 14/08/2014, 14:20

... of ad hoc networks: in most application scenarios, the wireless devices that form the network, or at least a significant percentage of them, are mobile This is the case, for instance, of ad hocnetworks ... context of mobile networks A first ment is about what we mean by mobile network It is clear that different types of nodemobility may occur in ad hoc networks, ranging from highly mobile networks (e.g ... proposed in the literature to deal with nodemobility neighbor-Topology Control in Wireless Ad Hoc and Sensor Networks P Santi  2005 John Wiley & Sons, Ltd Trang 5144 DEALING WITH NODE MOBILITY13.1

Ngày tải lên: 14/08/2014, 14:20