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Measuring the Performance of Packet size and Data
rate for Vehicular Ad Hoc Networks
Chan-Ki Park
Kuk-Hyun Cho
Dept. of Computer Science
Kwangwoon University
Seoul, Korea
Email: [email protected]
Dept. of Computer Science
Kwangwoon University
Seoul, Korea
Email: [email protected]
Min-Woo Ryu
Si-Ho Cha
Embedded S/W Convergence Research Center
KETI
Gyeonggi-do, Korea
Email: [email protected]
Dept. of Multimedia Science
Chungwoon University
Incheon, Korea
Email: [email protected]
Abstract—Since 2004, Vehicular Ad-hoc Networks (VANETs)
is core technology of Intelligent Transportation System (ITS),
in which standardize the Wireless Access in Vehicle
Environments (WAVE) based on IEEE 1609 and IEEE
802.11p. WAVE is a field of study to provide safety service and
information to person such as driver and passenger. Recently,
many researchers have been proposed resolution for high
velocity and rapid topology change. However, it assume equal
to packet size. Therefore, this assumption could not provide
various services for VANETs due to limited data packet size.
To do resolve this problem, in this paper, we analyzed
transmission rate of differences data packet in VANETs
environment and proposed future research about improving
transmission method according to difference packet size.
This assumption could not provide various services for
VANETs due to limited data packet size. Therefore, in this
paper, we analyzed transmission rate of differences data
packet in VANETs environment and proposed future
research about improving transmission method according to
difference data packet size.
The rest of this paper is organized as follows. In Section
Ⅱ we describe background of WAVE. In Section Ⅲ we
provide an analysis of the performance evaluation of
transmission rate in differences data packet. Finally, we
conclude this paper with remarks about future work in
Section Ⅳ.
II. BACKGROUND
Keywords—Vehicular ad-hoc network, Packet size, Data rate,
WAVE, V2V.
I. INTRODUCTION
Vehicular Ad-hoc Networks are special cases of mobile
ad-hoc network (MANET) [1], in which provide both
vehicle-to-vehicle (V2V) communication and vehicle-toinfrastructure (V2I) communication. V2V can be used to
provide information about traffic conditions and/or vehicle
accidents based on wireless inter-vehicle communication.
V2I can provide non-safety service via communication with
backbone networks such as real-time information on road
traffic conditions; basic Internet service, digital map and
multimedia download [2].
VANETs have characteristics such as nodes are highly
mobile, rapid topology change and highly dependence of
neighbor nodes. Therefore, routing protocol of VANETs
must be content with these characteristics [3-4].
Because of these characteristics, many researchers have
been proposed channel assign algorithms such as dynamic
channel assign according to node density and adaptive
channel assign using V2I. However, existing proposed
channel assign algorithms assume equal to data packet size.
IEEE 802.11p is known as Wireless Access in Vehicular
Environment (WAVE), in which is standardizing by IEEE
1609 working group and IEEE 802.11p working group from
2004 [5]. IEEE 802.11p was started for development of
Dedicated Short Range Communications (DSRC) usage and
assign of bandwidth. After this work, IEEE 802.11p WAVE
is developed new physical layer and medium access control
(MAC) for VANET based on orthogonal frequency division
multiplexing (OFDM) [6-7].
In addition, defined MAC protocol in IEEE 1609.4
provide efficient quality of service (QoS) using multichannel operation via extension of approach of enhanced
distributed channel access (EDCA) [8-9]. To support
efficient QoS, IEEE 1609.4 provide access category to
decide of priority and difference transmission parameter
according to priority.
Management frame is defined WAVE announcement in
IEEE 802.11p and it is transmitted in control channel (CCH).
On the other hand, data frame is transmitted including
WAVE short message (WSM) in CCH and service channel
(SCH). However, IP data frame is transmitted in only SCH.
978-1-4799-0604-8/13/$31.00 ©2013 IEEE
Sync interval is comprised CCH interval, SCH interval,
and Guard Interval, in which use synchronization to
monitoring to CCH and SCH. CCH interval and SCH
interval is saved to management information base (MIB) as
dot4CchInterval value and dot4SchInterval value. Before
start each channel, when it change channels, MAC protocol
protect to exchange information using guard interval.
Physical layer is assigned 7 channels of 10MHz in 5.9
GHz DSRC frequency band for V2V and V2I. All of these
channels, the 178 CH is used traffic safety for VANETs and
rest of channels are used commercial service.
III. SIMULATION RESULT
In this section, we analyze transmission rate of
differences data packet in VANETs using ns-2 simulator. We
considered the received data number according to data
packet size. Table 1 summarizes our simulation parameters.
The simulations were performed for 13s, and the number of
nodes was 2. The packet size was 1000byte and 5000 byte.
The experiments were performed thrice and average values
were used. Maximum and minimum values were excluded.
TABLE Ⅰ. Simulation Parameter
Parameter
Value
Number of Vehicles
2
Data Rate
1Mbps
Packets
UDP
Traffic Type
CBR
Packet size
1000byte & 5000byte
Packet Generation
Vehicle
Rate
Transmission Range of Vehicle
Propagation Model
of
Fig. 1. Received data number according to data packet size
IV. CONCLUSION
In this paper, we analyze transmission rate of difference
data packet size in VANETs. At the results, there exists a
difference in transmission efficiency. Therefore, when
VANETs transmit a data to neighbor nodes, data packet size
is very important factor for improving VANETs performance.
Future research will develop channel assign algorithm using
multi-channels and MAC protocol for improving
transmission efficiency.
REFERENCES
[1]
[2]
10Mbps
500 m
Two Ray
Model
[3]
Ground
Reflection
[4]
VANETs synchronize position of vehicles using global
positioning system (GPS) and use intersection approach
which is consistently change both CCH and SCH at every
50ms. Therefore, there exists a difference in transmission
efficiency between two cases: 1) in the case of being
transmitted within 50 ms and 2) in the case of being
transmitted over 50 ms due to different data packet size.
Figure 1 show the received data number according to data
packet size.
In the case of 1000 byte, it is transmitted 243 data packet
s per second, on the other hands in the case of 5000 bytes; it
is transmitted 63 data packets. Therefore, in the case of 1000
byte, it has 52.6% efficiency, on the other hands in the case
of 5000 bytes, it has 12.7% efficiency. According to the
simulation results, we are known that data packet size is very
important factor in VANETs.
[5]
[6]
[7]
[8]
[9]
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