02-06-2012, 11:03 AM
Adaptive Multi-Time slot Allocation protocol for wireless sensor networks
[attachment=23943]
Proposed method
Time division multiple access based mechanism normally reduces the channel utilization due to the limitation in channel assessment.
Nodes are only allowed to transmit a data only in a single timeslot.
The latency of the data transmission is affected by the length of timeslot and the number of timeslot in a frame.
El-Mac timeslot length depends on the duty cycle configured by the application module.
Low duty cycle operation increases the timeslot length. Hence, reduces the channel utilization.
El-Mac solves this problem by using adaptive multi-timeslot allocation (AMTA) scheme which allows a node to occupy a number of timeslots in a frame according to the traffic requirement
Continued….
For every n number of frames, el-Mac calculates the usage of the timeslot in a frame.
This is important because it will allow other nodes to occupy the unused timeslot.
In this simulation study we use path loss shadowing for the propagation model.
To calculate received power.
The objective of the experiment is to study then performance under two conditions.
ADVANTAGES:
AMTA algorithm, Latin square matrix compare increases the delivery ratio approximately 60% .
Packets can be transmitted more frequently because in a frame, nodes are able to use more numbers of timeslots. Thus, the allowable transmission rate increases at MAC layer.
Duty cycle calculation
Duty cycle is defined as percentage of time ti transmit a maximum length of data packet per time slot length
A high duty cycle value is specified for high rate data application. On the other hand low duty cycle is meant for low rate data application.
Adaptive multi-time slot allocation(amta)
To reduce transmission latency
Allow node to control multiple timeslot per frame
Adapt to traffic condition:
Increase number of controlled timeslots when high data transmission
Decrease number of controlled timeslots when low data transmission
Monitor to timeslot usage percentage of total number of controlled timeslots used to transmit for every number of frame
Node transmits beacon in external controlled timeslot
[attachment=23943]
Proposed method
Time division multiple access based mechanism normally reduces the channel utilization due to the limitation in channel assessment.
Nodes are only allowed to transmit a data only in a single timeslot.
The latency of the data transmission is affected by the length of timeslot and the number of timeslot in a frame.
El-Mac timeslot length depends on the duty cycle configured by the application module.
Low duty cycle operation increases the timeslot length. Hence, reduces the channel utilization.
El-Mac solves this problem by using adaptive multi-timeslot allocation (AMTA) scheme which allows a node to occupy a number of timeslots in a frame according to the traffic requirement
Continued….
For every n number of frames, el-Mac calculates the usage of the timeslot in a frame.
This is important because it will allow other nodes to occupy the unused timeslot.
In this simulation study we use path loss shadowing for the propagation model.
To calculate received power.
The objective of the experiment is to study then performance under two conditions.
ADVANTAGES:
AMTA algorithm, Latin square matrix compare increases the delivery ratio approximately 60% .
Packets can be transmitted more frequently because in a frame, nodes are able to use more numbers of timeslots. Thus, the allowable transmission rate increases at MAC layer.
Duty cycle calculation
Duty cycle is defined as percentage of time ti transmit a maximum length of data packet per time slot length
A high duty cycle value is specified for high rate data application. On the other hand low duty cycle is meant for low rate data application.
Adaptive multi-time slot allocation(amta)
To reduce transmission latency
Allow node to control multiple timeslot per frame
Adapt to traffic condition:
Increase number of controlled timeslots when high data transmission
Decrease number of controlled timeslots when low data transmission
Monitor to timeslot usage percentage of total number of controlled timeslots used to transmit for every number of frame
Node transmits beacon in external controlled timeslot