Performance Evaluation of a Modified Carrier Sense Multiple Access with Collision Detection Protocol
Title | Performance Evaluation of a Modified Carrier Sense Multiple Access with Collision Detection Protocol PDF eBook |
Author | Shamima Kabir |
Publisher | |
Pages | 310 |
Release | 2005 |
Genre | Collisions |
ISBN |
Using Carrier Sense Multiple Access with Collision Detection (CSMA/CD), Ethernet Local Area Networks (LANs) suffers from capture effect in packet loss. As a result of capture effect, some nodes may be locked-out using the medium for a period of time. Hence, CSMA/CD based Enthernet is unsuitable for real-time multimedia traffic. It does not guarantee delay bound, behaves poorly under heavy load conditions. To overcome these shortcomings and enhance performace of CSMA/CD base LAN, three new concepts are added to the conventional CSMA/CD. Firstly, each node in the LAN has a finite buffer. A nodes competes for access to the medium after its buffer is full. It will transmit all packets in the buffer if access is permitted. To minimize the waiting delay of packets in the buffer prior to transmission, a time-out period is set, beyond which a node is tries to transmit considering its buffer is full. Due to buffer, the number of nodes trying to transmit at a time is reduced, thereby collision rates is reduced. Capture effect, locked-out probability, bandwidth loss, and backoff delays are also reduced. To support all types of traffic ( mainly real-time traffic), the optimum buffer size obtained is 10 packets/buffer. Using this buffer, multimedia traffic can be sent in a streamed fashion within a delay bound. Secondly, the maximum retransmission attempt limit and backoff limit are reduced to 10 and 8 times respectively to guarantee a tolerable delay for multimedia applications. A new special-jamming signal is introduced. It gives transmission priority to the node that already has finished its maximum retransmission attempt. This prevents packet loss and quality degradation of received normal data traffic and multimedia traffic. The final one is the priority scheduler, which is activated when multiple modes send the special-jamming signal at a time. It gives permission to the node having either the lowest time-stamp of the smallest source of address (SA) to transmit while other nodes wait until their access is permitted accordingly. The proposed protocol is based on bus topology for a single channel LAN. Throughput, transmission efficiency, average delay and percentage of collision of the proposed network is evaluated against number of nodes, bus length and offered load within two enviroments, i.e. Fast Ethernet and Gigabit Enthernet. The results show significant performance improvement. Throughput, transmission efficiency are increased more than 10% average. On the other hand, average delay and percentage of collision are reduced to less than 2 ms and 3.5% respectively compared to the conventional CSMA/CD based LAN.
Scientific and Technical Aerospace Reports
Title | Scientific and Technical Aerospace Reports PDF eBook |
Author | |
Publisher | |
Pages | 804 |
Release | 1994 |
Genre | Aeronautics |
ISBN |
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Performance Analysis of Multiple Access Protocols
Title | Performance Analysis of Multiple Access Protocols PDF eBook |
Author | Shūji Tasaka |
Publisher | MIT Press |
Pages | 292 |
Release | 1986 |
Genre | Computers |
ISBN | 9780262200585 |
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.
34th IEEE Vehicular Technology Conference, 21-23 May 1984, Pittsburgh, Pennsylvania
Title | 34th IEEE Vehicular Technology Conference, 21-23 May 1984, Pittsburgh, Pennsylvania PDF eBook |
Author | |
Publisher | |
Pages | 360 |
Release | 1984 |
Genre | Electronics in transportation |
ISBN |
An Analysis of a Carrier Sense Multiple Access System with Collision Detection
Title | An Analysis of a Carrier Sense Multiple Access System with Collision Detection PDF eBook |
Author | Field, J. A. (James A.) |
Publisher | |
Pages | 38 |
Release | 1981 |
Genre | Computer networks |
ISBN |
Performance Analysis of Local Computer Networks
Title | Performance Analysis of Local Computer Networks PDF eBook |
Author | Joseph L. Hammond |
Publisher | Addison Wesley Publishing Company |
Pages | 440 |
Release | 1986 |
Genre | Computers |
ISBN |
Electronic Systems and Applications
Title | Electronic Systems and Applications PDF eBook |
Author | R. P Agarwal |
Publisher | Allied Publishers |
Pages | 452 |
Release | 1994 |
Genre | |
ISBN |