Safety Message Power Transmission Control
This is a Computer science case article that covers the recent VANET attraction to wide range of research that are aimed at the accomplishment of road safety and infotainment in addition to the comfortable experience in driving. The research seeks to ensure that all these variables shall be satisfied under low costs.
All vehicles that are in VANET do share and compete for a single 10MHz control channel shown as: 5.885-5.895 GHz, channel 178, which is used for safety indented messages as well as the service linked announcements. Any vehicle in the area does communicate signals of 10 times per second and this does result to a profound load on the channel. Due to this all the vehicles within the area have the responsibility of monitoring and the channels of control as often as possible with the aim of ensuring thy do receive all the safety concerns so that the safety avenues will be able to attain their targets as well. The safety information needs to be send to all the neighbors giving information about the on the spot vehicle status as well as letting the other vehicles be aware of the surrounding network. The relaying of this information has to be on high probability and reliability with the aim of avoiding network shortfalls.
To achieve the goal some variables on conditions have to be evaluated before transmission takes place for the objective of ensuring that the destined area is really the intended and their shall be no instances of congestion as a result. The conditions to be looked at involve the power of transmission and the dimension of the point in addition to the network status and the reverberation of the message. A send of the data without the considerations of the congestion control system would result to connection shortfalls and the relay squall ills.
Each of the messages transmitted has a unique series numeral that originates from the MAC LAYER is relation to the IEEE Std 802.11standards (2007).it is a two-byte series run field that is contained in the 802.11 MAC header that is used to and is capable of detecting the collisions as well as the traffic load in a network.
The power direct algorithm parameters are:
Receive percentage of beacons
Number of beacons received during 1 sec
Fault computed for single vehicle
Overall fault of the beacon received
Number of nodes
Percentage of receive
Distance between sender and receiver
Percentage of success for the current network status
Maximum distance for sending vehicle
Minimum distance for sending vehicle
Power deference between max and min power
Maximum power received from neighbors
Minimum power received from neighbors
Maximum power received in the field MaxP from neighbors
Minimum power received in the field MaxP from neighbors
Each of the vehicles in the network has to maintain the sequence of the received signal for it to be able to deduce the status of the traffic in the network.
All the vehicles that receive the signal must keep it safely and in series list (SL) for them to be able to determine the status of the network traffic as follows:
f = [[100 - p]/D] (2)
P = p-f (3)
F = [[summation].sub.[n=1].sup.n]([100 - P]/D)/n (4)
S = 100% - ([MaxD - MinD]/2xF)% (5)
The relayed signal does include information relating tom power such as maximum and minimum power received and the one involved in the signal transmission which is recorded in the Active Beacon List(ABL).
Deducing this data, enables any vehicle for instance Z is to get at any moment the analysis of power of the signals that were received by various vehicles read. This is dependant on the distance between the two as well as the status of the channel. As an example, if the vehicle represented by alphabet C does relay power below 29, there are chances that the signs will not be able to reach the destination hence resulting to congestions.
Any vehicle in the network is able to receive and then add it simultaneously into the signal. Incase the congestion reading is null; it is taken to mean that the power received hand no congestions contribution on the network.
Results and discussions
The allocation of maximum power is related to the transmission of safety message and enhances the distance that the signal will cover when the other conditions are favorable. It is though rare to have best setting and congestion is made rampart. A trial to send a high power message in congestion does make the situation worse. Due to this it is vital to detect clogging first and to facilitate the usage of suitable power that will render the message to intended destination and check on the channel obstruction.
Conclusion
The safety message is positive to the determination of the vehicles on the road at every minute. It is critical for it to be sent all the time to enable all the vehicles be aware of their peers. The sending of these messages results to overheads and obstruction that needs to be eliminated. It is critical in VANET to attain the apt broadcast power.
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