In a wireless network, where propagation delay is high but known, slotted Aloha (S-Aloha) is synchronized with respect to the receiver’s time slots. Since the transmitter knows the propagation delay to its receiver, after a frame is generated, the transmitter introduces a suitable delay before its transmission, such that the frame arrives exactly in a slot at the receiver. However, in an underw...

Multi-channel Slotted ALOHA is currently used primarily in satellite-based networks for transaction processing (e.g., credit card payments at cash registers). For these applications, maximization of attainable throughput while adhering to a maximum-delay constraint with a required probability reflects both the user’s requirements, the network owner’s desires, and the non-deterministic nature of...

The uniform-traac capacity of switchless, non-bus-oriented, ber-optic single-hop intercon-nections among N stations, each equipped with a small number of transmitters and receivers, can be as high as (log 2 N) concurrent transmissions on a single wavelength with round-robin scheduling in a time-slotted system. However, their capacity with the Slotted ALOHA access scheme does not increase with N...

AbsfrucfA new multichannel MAC protocol called Hop-Reservation Multiple Access (HRMA) for wireless ad-hoc networks (multi-hop packet radio networks) is introduced, specified and analyzed. HRMA is based on simple half-duplex, very-slow frequency-hopping spread spectrum (FHSS) radios and takes advantage of the time synchronization necessary for frequency hopping. HRMA allows a pair of communicati...

Dynamic framed slotted ALOHA (DFSA) protocol has been widely used in many RFID systems. According to the information from last frame (e.g. the number of idle, success and collision slots), DFSA dynamically adjusts the next frame size so as to reach higher identification efficiency. The process is known as tag estimation of DFSA. Similar to most existing tag anti-collision protocols, The DFSA in...

Deployment of wireless relay nodes can enhance system capacity, extend wireless service coverage, and reduce energy consumption in wireless networks. Network coding enables us to mix two or more packets into a single coded packet at relay nodes and improve performances in wireless relay networks. In this paper, we succeed in developing analytical models of the throughput and delay on slotted AL...

Packet Reservation Multiple Access (PRMA) can be viewed as a combination of TDMA and slotted ALOHA protocols. In PRMA, there are speech and data terminals that communicate with a base station. Downlink packets are scheduled by the base station, but for uplink access (first packet of a talkspurt or any data packet), terminals use slotted ALOHA. Speech terminals (and some data terminals, too) can...

A new multichannel MAC protocol called Hop-Reservation Multiple Access (HRMA) for wireless ad-hoc networks (multi-hop packet radio networks) is introduced, specified and analyzed. HRMA is based on simple half-duplex, very-slow frequency-hopping spread spectrum (FHSS) radios and takes advantage of the time synchronization necessary for frequency hopping. HRMA allows a pair of communicating nodes...

A network is defined by a collection of nodes clients, server, and links (routers) between pairs of client and server.The client edge router sends the test message to all the available routes to get the best path from the list of all possible paths based on the transmission delay time. choose an offline route selection algorithm i.e to select multi path routing algorithm.Data packets are forwar...