A data channel reservation protocol for high-speed processing in WDM single-hop networks

2002 ◽  
Vol 85 (11) ◽  
pp. 13-19
Author(s):  
Tomofumi Tamura ◽  
Mikio Takahara ◽  
Masanori Hanawa
Keyword(s):  
High Speed ◽  
Data Channel ◽  
Channel Reservation ◽  
Reservation Protocol

A Collision-Free Reservation Protocol for WDM Optical Star Networks

1997 ◽  
Vol 07 (05) ◽  
pp. 459-469
Author(s):  
Young-Chon Kim ◽  
Ho-Sook Lee
Keyword(s):  
Network Performance ◽  
Destination Node ◽  
Data Packets ◽  
Data Channel ◽  
Optical Star ◽  
Transmission Schedule ◽  
Reservation Protocol ◽  
Time Position ◽  
Throughput And Delay ◽  
Exchange Data

WDM single-hop networks allow a pair of nodes to exchange data packets directly and require an efficient protocol that coordinates the process of data transmission. However, the network performance with such protocols can be deteriorated by collisions that occur on control channel, data channel, destination node and source node. We present a Collision-Free Reservation Protocol (CFRP) for WDM single-hop networks with a passive optical star coupler. To eliminate all causes of collision, the CFRP properly distributes the transmission schedule both in time (position of data channel on the time axis) and space (wavelength of data channel to be used). Compared with the previous reservation-based protocols, the proposed CFRP enhances the overall network performance. This improvement in terms of network throughput and delay is verified by simulation.

scholarly journals Congestion Probabilities in Erlang-Engset Multirate Loss Models under the Multiple Fractional Channel Reservation Policy

2016 ◽  
Vol 21 (1) ◽  
pp. 35-46 ◽  
Author(s):  
Ioannis D. Moscholios
Keyword(s):  
Random Process ◽  
High Speed ◽  
Form Solution ◽  
Communication Link ◽  
Available Bandwidth ◽  
Channel Reservation ◽  
Blocking Probabilities ◽  
First Case ◽  
Recursive Formulas ◽  
Call Blocking Probabilities

Abstract A communication link that accommodates different service-classes whose calls have different bandwidth requirements and compete for the available bandwidth under the Multiple Fractional Channel Reservation (MFCR) policy is considered. The MFCR policy allows the reservation of real number of channels in order to favor high speed calls. Two call arrival processes are studied: i) the Poisson (random) process and ii) the quasi-random process. In the first case, calls come from an infinite number of sources while in the second case calls are generated by a finite number of sources. To determine call blocking probabilities for Poisson arriving calls, recursive formulas are proposed based on reverse transition rates. To determine time and call congestion probabilities for quasi-random arriving calls, recursive formulas are proven based on the fact that the steady state probabilities cannot be described by a product form solution. The accuracy of the new formulas is verified through simulation.

scholarly journals Satellite Navigation and Communication Integration Based on Correlation Domain Indefinite Pulse Position Modulation Signal

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Deyue Zou ◽  
Shouchuan Ma
Keyword(s):  
Data Transmission ◽  
Spread Spectrum ◽  
High Speed ◽  
Satellite Communications ◽  
Satellite Navigation ◽  
Location Based Services ◽  
Pulse Position Modulation ◽  
Signal System ◽  
Data Channel ◽  
Pilot Channel

Ubiquitous signal coverage is a basic demand of Internet of Things (IoT) communications, which meets the feature of satellite communications. Infinite user number is a basic demand of IoT location-based services, which meets the feature of Global Navigation Satellite System (GNSS). Both of these demands make Satellite Navigation and Communication Integration (SNCI) an important supporting technology for IoT. Inherited from the satellite communications system, GNSS itself has a certain data transmission capacity. Thus, enhancing the communication function of the GNSS is a promising means of achieving SNCI. Considering that a unified signal system cannot currently realize high-precision positioning and high-speed data transmission simultaneously in SNCI, this project proposes a Correlation Domain Indefinite Pulse Position Modulation (CDIPPM). A pilot channel and a data channel are introduced in this technology, which are distinguished by Code Division Multiplexing (CDMA). The synchronization function is provided by the pilot channel, thereby freeing the data channel of this function. The phase of the pseudorandom code can then be used as the carrier of information. In order to transmit more information, the transmitter of the proposed technology superimposes on the data channel multiple sets of spread spectrum sequence, which are generated from one set of spread spectrum sequence by different cyclic shifting operations. The receiver will identify the number and location of the correlation function peaks by a detection algorithm and recover the message. It can be seen by theoretical analysis and simulation verification. The technology can significantly improve satellite data transmission rates and maintain the original positioning function while minimizing change in the original GNSS signal. Therefore, the SNCI system based on this technology has the following advantages: a unified signal system, high positioning accuracy, high data transmission rate, and a backward navigation function, and it is easy to promote.

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