IEEE TRANSACTIONS ON ROBOTICS AND AUTOMATION, VOL. 14, NO. 1, FEBRUARY 1998
PPT ON Wireless Communications and a Priority
Access Protocol for Multiple Mobile
Terminals in Factory Automation
Aloha protocol in data communication and networkingkritikadas3
ALOHA: ALOHA is a system for coordinating and arbitrating access to a shared communication Networks channel. It was developed in the 1970s by Norman Abramson and his colleagues at the University of Hawaii. The original system used for ground based radio broadcasting, but the system has been implemented in satellite communication systems.
A Virtual Circuit is a circuit used in transportation of data over a packet switch networks.
Virtual Circuit appears as if there is a physical path established between and source and destination so that all packets(data) can be routed over that path during the transmission
Aloha protocol in data communication and networkingkritikadas3
ALOHA: ALOHA is a system for coordinating and arbitrating access to a shared communication Networks channel. It was developed in the 1970s by Norman Abramson and his colleagues at the University of Hawaii. The original system used for ground based radio broadcasting, but the system has been implemented in satellite communication systems.
A Virtual Circuit is a circuit used in transportation of data over a packet switch networks.
Virtual Circuit appears as if there is a physical path established between and source and destination so that all packets(data) can be routed over that path during the transmission
Frame relay is a packet-switching telecommunication service designed for cost-efficient data transmission for intermittent traffic between local area networks (LANs) and between endpoints in wide area networks (WANs).
The Network Layer is concerned about getting packets from source to destination, no matter how many hops it may take. It’s all about routing.
5.1 Network Layer Design Issues
What do we need to think about in this layer?
5.2 Routing Algorithms
Strategies for getting from source to destination.
5.3 Congestion Control Algorithms
How do we keep from bottlenecking from too many packets?
5.4 Internetworking
Working with multiple networks and protocols in order to deliver packets.
5.5 The Network Layer in the Internet
Gluing together a collection of subnets.
INTERNET PROTOCOL (IP)
, Datagram Format
, Fragmentation
, Options
, Security of IPv4 Datagrams
,ICMPv4
, MESSAGES
, Debugging Tools
, ICMP Checksum
, MOBILE IP
, Addressing
, Agents
, Three Phases
, Inefficiency in Mobile IP
Frame relay is a packet-switching telecommunication service designed for cost-efficient data transmission for intermittent traffic between local area networks (LANs) and between endpoints in wide area networks (WANs).
The Network Layer is concerned about getting packets from source to destination, no matter how many hops it may take. It’s all about routing.
5.1 Network Layer Design Issues
What do we need to think about in this layer?
5.2 Routing Algorithms
Strategies for getting from source to destination.
5.3 Congestion Control Algorithms
How do we keep from bottlenecking from too many packets?
5.4 Internetworking
Working with multiple networks and protocols in order to deliver packets.
5.5 The Network Layer in the Internet
Gluing together a collection of subnets.
INTERNET PROTOCOL (IP)
, Datagram Format
, Fragmentation
, Options
, Security of IPv4 Datagrams
,ICMPv4
, MESSAGES
, Debugging Tools
, ICMP Checksum
, MOBILE IP
, Addressing
, Agents
, Three Phases
, Inefficiency in Mobile IP
Recently Qualcomm announced its 5G (the fifth generation mobile communications) vision. 3GPP is going to finalize the 5G standard by 2018. 5G is scheduled to launch in around early 2020s. Even if it is not determined yet regarding the standard technology details, many researchers expect that 5G will transfer 1000 times more data, and thus, can connect billions of IoT (Internet of Things) devices at the same time. Key candidate technologies that enable 5G to support IoT devices connection are millimeter wave/MIMO (multiple input and multiple output) technology, cloud RAN/network function virtualization (NFV)/ software defined network (SDN), ultra dense network (UDN), low latency network and RSMA (Reservation multiple access)/FDR (full-duplex relaying). Following Qualcomm patents illustrate some examples of the 5G standard technology R&D of Qualcomm.
Performance of Vehicle-to-Vehicle Communication using IEEE 802.11p in Vehicul...IJNSA Journal
Traffic safety applications using vehicle-to-vehicle (V2V) communication is an emerging and promising area within the ITS environment. Many of these applications require real-time communication with high reliability. To meet a real-time deadline, timely and predictable access to the channel is paramount. The medium access method used in 802.11p, CSMA with collision avoidance, does not guarantee channel
access before a finite deadline. The well-known property of CSMA is undesirable for critical communications scenarios. The simulation results reveal that a specific vehicle is forced to drop over 80% of its packets because no channel access was possible before the next message was generated. To overcome this problem, we propose to use STDMA for real-time data traffic between vehicles. The realtime properties of STDMA are investigated by means of the highway road simulation scenario, with promising results.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
SPEECH QUALITY EVALUATION BASED CODEC FOR VOIP OVER 802.11P ijwmn
Voice over Internet Protocol (VoIP) may provide good services through Vehicular ad hoc networks
(VANETs) platform by providing services to many application scenarios range from safety to comfort.
However, VANETs networks introduce many challenges for supporting voice with QoS requirements. In
this paper, our study is based on Inter-Vehicle voice streaming rely on multi-hop fashion. For this task, a
performance evaluation of various audio CODECs will be analyzed by mean of simulations.
Furthermore, we test the impact of network environment on QoS metrics. To achieve good results,
CODECs behaviour is tested by using mobility information obtained from vehicular traffic generator. The
mobility model is based on the real road maps of an urban environment. Focusing on inter-vehicular
voice traffic quality, we provide simulations results in terms of both user level (MOS) metrics and
network level (such as Losses). According to this performance evaluation, we show that G.723.1 CODEC
worked well in the urban VANET environment.
In this thesis firstly we study the effects of Black hole attack in MANET using both Proactive and Reactive routing protocols and then discovering a Secure Path in MANET by Avoiding Black/Gray Holes. The impact of Black Hole attack on the performance of MANET is evaluated finding out which protocol is more vulnerable to the attack and how much is the impact of the attack on both protocols. blackhole route
CAN and TTP are the two wired network protocols used for distributed .pdfssuserc77a341
CAN and TTP are the two wired network protocols used for distributed embedded system
network communication discussed in class. Another very popular protocol is flexRay, Give a
clear description ofFlexray and indicate the main differences between Flexray. CAN, and TTP
(do not just summarize these difference in a table). To get credit for this question you must
include your sources as references|
Solution
ISSN(Online): 2320
-
9801
ISSN (Print): 23
20
-
9798
I
nternational
J
ournal of
I
nnovative
R
esearch in
C
omputer
and
C
ommunication
E
ngineering
(An ISO 3297: 2007 Certified Organization)
Vol.2, Special Issue 4, September 2014
Copyright to
IJIRCCE
www.ijircce.com
63
Several time
-
triggered technologies su
ch as time
-
triggered CAN (TTCAN
[7], [8]), time
-
triggered protocol (TTP,
[9], [10]), and
FlexRay
[11], [12] have been designed to provide predictable medium access at a higher available
bandwidth. An example
of in
-
vehicle network for a typical car is shown in figure 1 below.
Figure 1.
In
-
vehicle network example.
Time
-
triggered protocol (TTP) has been developed by Technical University of Vienna after two
decades of e
xtensive
research. Messages using TTP ar
e statistically schedule based on the progression of time. It has an advantage that it can
precisely control the message transmission and reception time. This characteristic makes it
suitable
for safety critical
applications. However, there are three drawb
acks to see: it is inefficient in terms of network utilization and periodic
message response time and the other being lack of flexibility.
Nowadays, either an event
-
triggered or a time
-
triggered mechanism is required for message transmissions in the
vehi
cle network, and in some cases, both of them are required at the same time in complex control
system
s. A hybrid
type of protocol has evolved called
FlexRay
communication protocol which allows transmitting both event
-
triggered
and time
-
triggered messages on
the same bus, thus taking the advantages of both approaches.
In this paper, we selected the most commonly used protocol CAN which is an event
-
triggered technology, TTP
which is a time
-
triggered protocol and the newest protocol in the market,
FlexRay
, fo
r comparison. The section II
describes the history and background of the three protocols. The section III will present an
overvie
w of how the three
protocols work. A number of different comparisons of the three protocols is made in section IV.
Fina
lly, the
real
-
time
demands are discussed in section V followed by conclusions.
II.
HISTORY
AND
BACKGROUND
A.
Controller Area Network
It is a serial bus system, which was developed by Robert Bosch in 1980’s for automotive
applications
. The design
was simple, efficient
and robust communication network. The CAN protocol is internationally standardized in ISO
11898
-
1 and comprises the data link layer and components of the physical layer of the 7
-
layer ISO
-
OSI reference
model. CAN, which is now available from mo.
International Journal of Computer Science, Engineering and Information Techno...ijcseit
International Journal of Computer Science, Engineering and Information Technology (IJCSEIT) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of Computer Science, Engineering and Information Technology. The Journal looks for significant contributions to all major fields of the Computer Science and Information Technology in theoretical and practical aspects. The aim of the Journal is to provide a platform to the researchers and practitioners from both academia as well as industry to meet and share cutting-edge development in the field.
Candidate solutions to improve Wireless Mesh Networks WMNs performance to mee...ijcseit
96% market share of existing Smart Grid network installations is wireless mesh networks [1]. The paper starts by justifying the selection of WMNs as opposed to any other communication technology based on quantifying the bandwidth/latency/QoS constraints of a number of Smart Grid applications. The main objective of this paper, however, is to discuss some optimization techniques that found in the literature and can be implemented to overcome some of the challenges currently being faced by WMNs deployment in Smart Grid’s NANs. Hybrid WMN (HWMN) is proposed as an optimization on the topology level to leverage WMNs convergence. Distributed Autonomous Data Routing DADR, multigate and diversity routing are optimizations on the protocol level to minimize the down time of WMNs. Cognitive Radio is investigated as an optimization on the physical level. The paper also explores the feasibility of using Wireless Software Defined Networks WSDN to improve the overall visibility and manageability of WMNs
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Wireless Communications and a Priority Access Protocol for Multiple Mobile Terminals in Factory Automation
1. Wireless Communications and a Priority
Access Protocol for Multiple Mobile
Terminals in Factory Automation
SUBMITTED BY :-
SANDEEP KR. MAHAWAR
2011UEC1303
EC-3
3. Introduction
MANUFACTURING automation requires many mobile terminals. A robot is a good
example of mobile terminals in manufacturing automation. Recently, multirobot
systems have received much attention. The main reason for setting up a multirobot
system is because two or more robots are necessary for performing manufacturing
tasks, for example, carrying large objects. The problem then arises from the fact
that coordination of these mobile devices becomes important. Recently, using
local area network (LAN) for such operation has become an active research topic.
Since 1980’s, the hardwired, token bus-based manufacturing automation protocol
(MAP) network has been widely accepted for computer integrated
manufacturing.
4. Wireless LAN
A wireless local area network (WLAN) would lessen the
time and cost of factory installation, restructuring and
network maintenance and may allow mobile, hand-held
communication users. In other words, a WLAN is a
relatively low cost network of communicating control
information and data to and from any mobile and fixed
terminals in a factory automation application.
5. WIRELESS ACCESS INFRASTRUCTURE
The following subsection will describe our proposed
wireless access infrastructure
The Current Standards
Adding Wireless Strategy
CDMA Techniques
6. The Current Standards
Two widely used standards are the proposed manufacturing
automation protocol (MAP) and Fieldbus (IEC TC65C).
For convenience of documentation and separation of
functionality, MAP is referenced on the seven-layer ISO
model while Fieldbus specifications are partitioned into five-layer
structures.
These two standards characterize two different layer
structures.
7. Adding Wireless Strategy
The most desirable application of wireless access in factory
integration is communication to and from mobile devices such as
AMR’s and robots that may be clustered in islands of automation.
There exist moving difficulties when these mobile devices are wired to
the network. Therefore, we propose that each island can be covered
by a base station. There could be several base stations in each
factory floor, depending on the size of subnetworks and the number
of mobile devices. Each base station controls a radio coverage area
(RCA), and the RCA’s may be nonuniform and partially overlapping.
8. CDMA Techniques
Most current WLAN products employ the code division
multiple access (CDMA) techniques. The CDMA systems
use spread spectrum technologies that are very suitable
for indoor communication due to their capabilities in anti-multipath,
antijamming, and low probability of
interception and detection. In addition, the capability of
allowing asynchronous, overlapped transmissions may be
the key for commercial applications.
9. WIRELESS ACCESS PROTOCOLS
Multiple access schemes used in traditional LAN’s include random access
(Aloha), token passing and polling access (token bus or ring), deterministic
access (TDMA/FDMA), and demand access (handshake).
10. PERFORMANCE EVALUATION AND
NUMERICAL RESULTS
we classify the traffic class into type I and type II. A type-I traffic is the traffic that
carries timely information that has to reach the supervisory computer on time,
otherwise, it becomes useless. This kind of traffic must have priority over the other
traffic. Also, it is critical to errors, thus requires more reliable transmission. A type-II
traffic, on the other hand, is less sensitive to delay (latency) and may not be
critical to errors (can be retransmitted).
Probability that an idle type-I unit will generate packet for transmission at next
frame is
Probability that an idle type-II unit will generate packet for transmission at next
frame is
11. The average delay normalized to a frame period as
The average probability of successful handshaking
12. CONCLUSION
We can conclude that by using the wireless
communication and suitable protocol, the
installation and maintenance cost can be
reduced without deteriorating its performance,
and it also provides the flexibility in factory
automation planning and restructuring.