Dynamic TDMA Slot
Dynamic TDMA Slot
Assignment in Ad Hoc
Assignment in Ad Hoc
Network
Network
CN EE CCU
CN EE CCU
Speaker:
Speaker:
游
游
千
千
冊
冊
2005/11/29
2005/11/29
1
1
Outline
Outline
Introduction
Introduction
USAP
USAP
USAP-MA
USAP-MA
Dynamic TDMA Slot Assignment
Dynamic TDMA Slot Assignment
Frame Format
Frame Format
Packet Format
Packet Format
Slot Assignment
Slot Assignment
Detection of Conflict and its solution
Detection of Conflict and its solution
Releasing Slot Assignment
Releasing Slot Assignment
Performance Evaluation
Performance Evaluation
Conclusion
Conclusion
2
2
Outline
Outline
Introduction
Introduction
USAP
USAP
USAP-MA
USAP-MA
Dynamic TDMA Slot Assignment
Dynamic TDMA Slot Assignment
Frame Format
Frame Format
Packet Format
Packet Format
Slot Assignment
Slot Assignment
Detection of Conflict and its solution
Detection of Conflict and its solution
Releasing Slot Assignment
Releasing Slot Assignment
Performance Evaluation
Performance Evaluation
Conclution
Conclution
3
3
Introduction(1/3)
Introduction(1/3)
Ad hoc network are temporarily constructed by
Ad hoc network are temporarily constructed by
only mobile hosts.
only mobile hosts.
TDMA provide the collision-free packet
TDMA provide the collision-free packet
transmission regardless of the traffic load.
transmission regardless of the traffic load.
Traditional TDMA technique do not take into
Traditional TDMA technique do not take into
consideration
consideration
autonomous
autonomous
behaviors of mobile
behaviors of mobile
host , and thus they cannot assign time slots for
host , and thus they cannot assign time slots for
new coming mobile hosts.
new coming mobile hosts.
4
4
Introduction(2/3)
Introduction(2/3)
A few conventional protocols [7,8] that assign
A few conventional protocols [7,8] that assign
time slots for new coming mobile hosts , but
time slots for new coming mobile hosts , but
the channel utilization is low.
the channel utilization is low.
Our proposed protocol to improve the channel
Our proposed protocol to improve the channel
utilization by changing the frame length
utilization by changing the frame length
dynamically according to the number of
dynamically according to the number of
mobile hosts in the
mobile hosts in the
contention area
contention area
.
.
5
5
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