Download or read book Performance Evaluation of Channel Access Schemes in Multihop Packet Radio Networks with Regular Structure by Simulation written by Fouad A. Tobagi and published by . This book was released on 1985 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Download or read book Performance Evaluation of Channel Acces Schemes in Multishop Packet Radio Networks with Regular Structure by Simulation written by Stanford University. Computer Systems Laboratory and published by . This book was released on 1985 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Analysis of Multi Channel and Multi Traffic on Wireless Communication Networks written by Wuyi Yue and published by Springer Science & Business Media. This book was released on 2002-02-28 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book attempts to present exact and approximate analytical solution methods and techniques using queueing theory in the complex multimedia traffic systems with procedures of random multiple access schemes. In particular, this book presents how to approximate the system performance of discrete-time multimedia networks, the probability distribution of the interarrival time of internetwork packets at the adjacent network and the higher moments of the transmission departure distribution and delay in wireless multimedia communication environment. In general the modeling of discrete-time multimedia communication systems are more complex than that of continuous-time systems because multiple state changes can occur from one time-unit to the next. This complicates the analysis of the model. This book also discusses numerical results that illustrate the applications of the theory and various properties.

Download or read book Performance Evaluation of Multihop Packet Radio Networks by Simulation written by David Hilton Shur and published by . This book was released on 1986 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Download or read book Performance Evaluation of Multi access Strategies for an Integrated Voice data CDMA Packet Radio Network written by Mohsen Soroushnejad and published by . This book was released on 1989 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Space Communication and Broadcasting written by and published by . This book was released on 1987 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Analysis of Multiple Access Protocols written by Shūji Tasaka and published by MIT Press. This book was released on 1986 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Broadcast media, such as satellite, ground radio, and multipoint cable channels, can easily provide full connectivity for communication among geographically distributed users. One of the most important problems in the design of networks (referred to as packet broadcast networks) that can take practical advantage of broadcast channels is how to achieve efficient sharing of a single common channel. Many multiple access protocols, or algorithms, for packet broadcast networks have been proposed, and much work has been done on the performance evaluation of the protocols. A variety of techniques have been used to analyze the performance; however, this is the first book to provide a unified approach to the performance evaluation problem by means of an approximate analytical technique called equilibrium point analysis. Two types of packet broadcast networks - satellite networks and local area networks are considered, and eight multiple access protocols are studied and their performance analyzed in terms of throughput and average message delay. Contents Part I: Fundamentals - Multiple Access Protocols and Performance - Equilibrium Point Analysis - Part II: Satellite Networks - S-ALOHA - R-ALOHA - ALOHA-Reservation - TDMAReservation - SRUC - TDMA - Performance Comparisons of the Protocols for Satellite Networks - Part III: Local Area Networks - Buffered CSMACD - BRAM Performance Analysis of Multiple Access Protocols is included in the Computer Systems Series, Research Reports and Notes, edited by Herb Schwetman.

Download or read book Telecommunications Abstracts written by and published by . This book was released on 1987 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Evaluation of Multi access Strategies for an Integrated Voice data CDMA Packet Radio Network written by Mohsen Soroushnejad and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance analysis of computer communication networks via random access channels written by Stanford University Stanford Electronics Laboratories. Digital Systems Laboratory and published by . This book was released on 1977 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of computer communication networks has grown very rapidly in the past few years. One way to communicate is via multiple access broadcast channels. A new class of random access schemes referred to as the Mp-persistent CSMA scheme is proposed. It incorporates the nonpersistent CSMA scheme and the 1-persistent CSMA scheme, both slotted and unslotted versions, as its special cases with p=0 and 1, respectively. The performance of the Mp-persistent CSMA scheme under packet switching is analyzed and compared with other random access schemes. By dynamically adjusting p, the unslotted version can achieve better performance in both throughput and delay than the currently available unslotted CSMA schemes under packet switching. Furthermore, the performance of various random access schemes under message switching is analyzed and compared with that under packet switching. In both slotted and unslotted versions of the M0-persistent CSMA scheme, the performance under message switching is superior to that under packet switching in the sense that not only the channel capacity is larger but also the average number of retransmissions per successful message under message switching is smaller than that per successful packet under packet switching. In dynamic reservation schemes, message switching leads to larger channel capacity. However, in both slotted and unslotted versions of the ALOHA scheme, the channel capacity is reduced when message switching is used instead of packet switching. This phenomenon may also happen in the Mp-persistent CSMA scheme as p deviates from 0 to 1 for certain distributions of message length. Hence, the performance under message switching may be superior to or inferior to that under packet switching depending upon the random access scheme being used and the distribution of message length (usually a large coefficient of variation of message length implies a large degradation of channel capacity in this case) for certain random access schemes. Nevertheless, for radio channels, message switching can achieve larger channel capacity if appropriate CSMA schemes are used. A mixed strategy which is a combination of message switching and packet switching is proposed to improve the performance of a point to point computer communication network when its terminal access networks communicate via highly utilized radio channels.

Download or read book Performance Evaluation of Multihop Packet Radio Systems written by Fouad A. Tobagi and published by . This book was released on 1982 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the final report for the research carried out at the Computer Systems Laboratory under ARO contract number DAAG 27-79-C-0138 during the period from August 6, 1979 to November 5, 1982. The research effort related to packet radio systems and their evaluation. Throughout the contract period, the effort mainly focused on one important aspect underlying these networks, namely the channel access problem.

Download or read book Performance Analysis of Multihop Packet Radio Networks Under Slotted Frequency Hopping Access Scheme written by Hahan Rahardjo and published by . This book was released on 1987 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Architectures and Performance of Multichannel Multihop Packet Radio Networks written by Nachum Shacham and published by . This book was released on 1986 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Packet radio networks that employ several parallel multiple-access channels are considered. An architecture for such a network dictates the selection of channels for packet transmission. We propose and analyze two multichannel architectures. In the first, each node employs a single radio and is assigned a channel on which it listens when it does not transmit. To transmit a packet, the node tunes its radio to the channel of the intended receiver for that transmission only. The second architecture requires each radio to use a single channel for both transmission and reception, but provides some of the nodes with more than one radio each, allowing them to serve as bridges between channels. Within these architectures one can further select the amount of routing information held by each node and the channel-access protocol, both of which greatly affect the network performance. To ascertain the effect of the various parameters, we calculate the throughput and average packet progress in both architectures. The channel access protocols we consider are slotted ALOHA and CSMA with and without capture. We also evaluate the effect of increasing the amount of routing information held be the nodes.

Download or read book Simulation of Busy Tone Multiple Access Modes in Multihop Packet Radio Networks written by Fouad A. Tobagi and published by . This book was released on 1982 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study we examine via simulation, the performance of the ALOHA, CSMA, BTMA, and CDMA channel access schemes in multihop packet radio systems. The performance of CSMA, which is efficient in fully-connected environments, is shown to degrade significantly in the presence of hidden nodes. The BTMA protocol attempts to overcome the hidden node problem and to obtain efficient channel utilization in multihop environments by having nodes transmit a busy tone when they are busy receiving. In an example of a six node ring topology, we compare the performance of the CSMA and ALOHA schemes with four variants of BTMA. The highest throughput is achieved by II-BTMA and C-BTMA, which both significantly outperform the CSMA and ALOHA schemes. Our conclusion is that the improvement in bandwidth utilization achieved by BTMA in environments with hidden nodes, is expected to more than compensate for the cost of the busy tone channel. (Author).

Download or read book Throughput Performance of Spread Spectrum Multiple Access Packet Radio Networks written by James Scott Storey and published by . This book was released on 1986 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Download or read book On the Performance Analysis and Media Access of Distributed Mobile Multi hop Packet Radio Networks written by Lawrence Charles Pond and published by . This book was released on 1989 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Packet Radio Networks written by Clifford A. Lynch and published by Pergamon. This book was released on 1987 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: