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An Enhanced Message Priority Mechanism in IEEE 802.11p Based Vehicular Networks
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 Title & Authors
An Enhanced Message Priority Mechanism in IEEE 802.11p Based Vehicular Networks
Liu, Chang; Chung, Sang-Hwa; Jeong, Han-You; Jung, Ik-Joo;
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IEEE 802.11p is a standard MAC protocol for wireless access in vehicular environments (WAVEs). If a packet collision happens when a safety message is sent out, IEEE 802.11p chooses a random back-off counter value in a fixed-size contention window. However, depending on the random choice of back-off counter value, it is still possible that less important messages are sent out first while more important messages are delayed longer until sent out. In this paper, we present a new scheme for safety message scheduling, called the enhanced message priority mechanism (EMPM). It consists of the following two components: the benefit-value algorithm, which calculates the priority of the messages depending on the speed, deceleration, and message lifetime; and the back-off counter selection algorithm, which chooses the non-uniform back-off counter value in order to reduce the collision probability and to enhance the throughput of the highly beneficial messages. Numerical results show that the EMPM can significantly improve the throughput and delay of messages with high benefits when compared with existing MAC protocols. Consequently, the EMPM can provide better QoS support for the more important and urgent messages.
Contention Window;IEEE 802.11p;MAC Layer;Message Priority;Vehicular Network;
 Cited by
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