The Modeling Of Packet Radio Networks
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The Modeling Of Packet Radio Networks
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Author : Adrian Segall
language : en
Publisher:
Release Date : 1979
The Modeling Of Packet Radio Networks written by Adrian Segall and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
Performance Evaluation Of Multihop Packet Radio Networks By Simulation
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Author : David Hilton Shur
language : en
Publisher:
Release Date : 1986
Performance Evaluation Of Multihop Packet Radio Networks By Simulation written by David Hilton Shur and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
Packet switched networks provide an efficient and flexible method for interconnecting geographically distributed users for the purpose of digital data transmission. In packet radio networks, nodes transmit packets over multiple-access broadcast radio channels instead of wire, cable or fiber optics links. If the destination node of a packet is not within the power range of its source node, intermediate nodes are needed to deliver the packet in a store-and-forward fashion. Therefore, multihop packet radio networks have both the multiple-access feature typical of broadcast networks and the store-and-forward feature of point-to-point networks. Since only under restrictive assumptions is performance analysis tractable, simulation techniques must be used. (jes).
Modeling And Analysis Of Voice And Data In Cognitive Radio Networks
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Author : Subodha Gunawardena
language : en
Publisher: Springer Science & Business Media
Release Date : 2014-03-14
Modeling And Analysis Of Voice And Data In Cognitive Radio Networks written by Subodha Gunawardena and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-03-14 with Computers categories.
This Springer Brief investigates the voice and elastic/interactive data service support over cognitive radio networks (CRNs), in terms of their delay requirements. The increased demand for wireless communication conflicts with the scarcity of the radio spectrum, but CRNS allow for more efficient use of the networks. The authors review packet level delay requirements of the voice service and session level delay requirements of the elastic/interactive data services, particularly constant-rate and on-off voice traffic capacities in CRNs with centralized and distributed network coordination. Some generic channel access schemes are considered as the coordination mechanism, and call admission control algorithms are developed for non-fully-connected CRNs. Other key topics include the advantages of supporting voice traffic flows with different delay requirements, the mean response time of the elastic data traffic over a centralized CRN, and effects of the traffic load at the base station and file length (service time requirement) distribution on the mean response time. The brief is designed for professionals and researchers working with wireless networks, cognitive radio, and communications. It is also a helpful reference for advanced-level students interested in efficient wireless communications.
Capacity Analysis Of Multihop Packet Radio Networks Under A General Class Of Channel Access Protocols And Capture Models
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Author : Jose M. Brazio
language : en
Publisher:
Release Date : 1987
Capacity Analysis Of Multihop Packet Radio Networks Under A General Class Of Channel Access Protocols And Capture Models written by Jose M. Brazio and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.
A packet radio network is a collection of geographically distributed packet radio units communicating over a shared broadcast channel. Usually not all radio units are within hearing range of each other, and thus multihop operation is required. These networks represent the natural extension of point-to-point packet-switched data networks when mobile operation is desired. An important difference exists, however, with respect to the latter: due to the multiaccess nature of the radio channel, the success of a packet at a destination depends on the activity, during the transmission of the packet, of the neighbors of the destination, and on system parameters such as the type of signaling and received power levels. The conditions under which a packet is successfully received in the presence of interfering packets are designated as the capture mode. Due to the existence of multiuser interference, some form of coordination among the users is required when accessing the channel. This purpose is accomplished by the channel access protocol. (RRH).
Simulation Studies Of Protocols For Random Access Packet Radio Networks
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Author : A. I. A. Jabbar
language : en
Publisher:
Release Date : 1989
Simulation Studies Of Protocols For Random Access Packet Radio Networks written by A. I. A. Jabbar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
Conditions For Product Form Solutions In Multihop Packet Radio Network Models
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Author : Jose M. Brazio
language : en
Publisher:
Release Date : 1985
Conditions For Product Form Solutions In Multihop Packet Radio Network Models written by Jose M. Brazio and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Packet switching (Data transmission) categories.
Consider multihop packet radio networks operating under a general class of channel access protocols. For the purpose of throughput analysis, analytical models are considered which describe the joint activity of the transmitters in the network, under the assumptions of heavy traffic and zero propagation and processing delays. The problem addressed in this report is that of finding conditions for the existence of product form solutions for the steady-state probabilities of these models. The main result states that a necessary and sufficient conditions for a given network topology, channel access protocol, and traffic pattern, to lead to a product form solution is that the blocking between each pair of used links, as specified by the access protocol, by symmetric. This result assumes Poisson scheduling point processes associated with the links of the network. The proof is given in two steps: first, for systems where all packet length distributions are exponential, giving rise to Markovian processes; and second, for general packet length distributions (subject to the restriction of possessing a positive density almost everywhere), giving rise to Generalized Semi-Markov Processes. It is also shown that a product form solution does not exist whenever any of the scheduling point process in the network is not Poisson. In addition, it is proven that the computation of the normalization factor appearing in the expression of the product form solution is an NP-hard problem. (rh).
A Simulation Model Of The Courteous Csma Protocol For Packet Radio Networks
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Author : Kendall D. Draeger
language : en
Publisher:
Release Date : 1987
A Simulation Model Of The Courteous Csma Protocol For Packet Radio Networks written by Kendall D. Draeger and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.
Throughput Performance Of Spread Spectrum Multiple Access Packet Radio Networks
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Author : James Scott Storey
language : en
Publisher:
Release Date : 1986
Throughput Performance Of Spread Spectrum Multiple Access Packet Radio Networks written by James Scott Storey and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with categories.
In this dissertation, an integrated model of an unslotted spread spectrum multiple access (SSMA) packet radio network is developed. The model combines a detailed model of the radio channel, accounting for the effect of multi-user interference, with a network model that traces the evolution of the number of interfering transmissions and accounts for the half-duplex nature of the radios. A new analysis of the performance of a Viterbi decoder in a packet radio environment allows the model to be used for a system with convolutional Forward Error Correction (FEC) coding. The synchronization process is also analyzed and incorporated into the integrated model. The model makes use of several approximations for tractability. A discrete event simulation is used to validate these approximations. The integrated model leads to numerical results which show the throughput and the probability of success for a packet as a function of the channel level and network level parameters. Specifically, for the radio channel, these parameter include the modulation format, the received signal power, the spread spectrum bandwidth expansion, and the presence or absence of FEC coding. Also, the throughput is found as a function of the synchronization parameters, such as the detection thresholds and correlation times, for several different synchronization circuits and preamble structures. At the network level, the parameters are the traffic rate and the network size. The random access protocols considered include unslotted ALOHA and channel load sensing, which is an extension of carrier sensing to an SSMA network. (jhd).
Use Of Finite Random Graphs To Model Packet Radio Networks
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Author : Yang Wang
language : en
Publisher:
Release Date : 1990
Use Of Finite Random Graphs To Model Packet Radio Networks written by Yang Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Graph theory categories.
Performance Evaluation Of Channel Access Schemes In Multihop Packet Radio Networks With Regular Structure By Simulation
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Author : Fouad A. Tobagi
language : en
Publisher:
Release Date : 1985
Performance Evaluation Of Channel Access Schemes In Multihop Packet Radio Networks With Regular Structure By Simulation written by Fouad A. Tobagi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Computer networks categories.
In this report, the performance of various channel access schemes in multi-hop packet radio networks with a regular structure is studied by means of simulation. The channel access schemes considered are: ALOHA (pure and slotted), Carrier Sense Multiple Access (CSMA), Busy Tone Multiple Access (BTMA), Code Division Multiple Access (CDMA), and a new hypothetical scheme introduced here for comparison purposes referred to as Coded Activity Signalling Multiple Access (CASMA. Network throughput and packet delay are evaluated, as well as the effects on performance of the nodal transmission scheduling rate, the propagation delay among nodes, and to some extent the input flow control. In this study, we consider networks in which both the topology and the traffic pattern are symmetric. This renders all nodes in the network statistically identical, and thus helps reduce the complexity of the simulation task considerably without jeopardizing the objective. The performance of CSMA in such networks is shown to be rather poor as compared with its performance in fully connected networks, while relatively high performance is achieved by the CASMA scheme, as compared with CSMA and the ALOHA schemes. (RH).