IEEE 802.11p Vehicle to Vehicle (V2V) Communication

Instructor: Assist. Prof. Dr. Mehmet TOYCAN

Mr. Charles Joseph OgalaCIU Research GroupCyprus International UniversityMarch 03, 2011

Agenda

1. Motivation1. Motivation

2. Line Of Sight2. Line Of Sight

3. N -Line Of Sight3. N -Line Of Sight

4. Differences between IEEE 802.11p and IEEE 802.11a

4. Differences between IEEE 802.11p and IEEE 802.11a

6.WAVE (Wireless Access in Vehicular Environments )6.WAVE (Wireless Access in Vehicular Environments )

What We’ll Cover Today!!!

Executive Summary

Introduction• V2V promoters focus on vehicle-to-vehicle and

vehicle-to-infrastructure communication. Dedicated applications include toll collection, red light duration broadcast at traffic lights or hot spots for transferring maps, routing information or traffic jams. But also active accident warnings should be transferred from cars in a traffic jam to the oncoming cars.

Motivation • The main motivation behind this work is to enable

public safety applications that can save lives and improve traffic flow.

• The main challenges for the 802.11p standard are frequency spectrum availability and fading.

Line Of Sight

• The term LOS path is referred the situation where we have visual line of sight contact between the transmitting antenna and the receiving antenna.

• The Ricean distribution can be used for modeling small-scale fading

Non-Line Of Sight

• For the N-LOS path it is found that the amplitude of the received signal due to fading obeys Rayleigh fading distribution and the delay spreads were several times greater than that for the LOS.

Differences between IEEE 802.11p andIEEE 802.11a

• Bandwidth In 802.11p, the 10 MHz bandwidth is usually used, in order

to make the signal more robust against fading.

• Carrier spacing The 802.11p signal uses a carrier spacing reduced by ½

compared to 802.11a.• Symbol length The symbol length is doubled, making the signal more

robust against fading.• Frequency The 802.11p standard usually operates in the 5.8 GHz and

5.9 GHz frequency bands.

WAVE (Wireless Access in Vehicular Environments)

• The standard consists of four parts, which are stated below

• IEEE 1609.1• IEEE 1609.2• IEEE 1609.3• IEEE 1609.4

DSRC (Dedicated Short Range Communications)

• U.S. Federal Communication Commission that has allocated 75MHz spectrum at 5:925 GHz -5:85 GHz exclusively for V2V

• The DSRC band is a free but licensed spectrum. It is free because the FCC does not charge a fee for the spectrum usage.

• The DSRC spectrum is structured into seven 10 MHz wide channels. Channel 178 is the control channel (CCH), which is restricted to safety communications only .

• The two channels at the ends of the spectrum band are reserved for special uses .

• The rest are service channels (SCH) available for both safety and non-safety usage.

DSRCChannel Allocation

Simulators

• I intend to use MATLAB to simulate the network and try and improve the network with respect to multi-path fading as already there are some examples on MATLAB

Conclusion

• In this presentation, we began with the core motivation, we than spoke about the Line of sight and Non-Line of sight. Then we try to see the differences between IEEE 802.11p andIEEE 802.11a all part of the protocol and aspect of Vehicle to Vehicle (V2V) which is the core area of the study

THANK YOU !

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