Enhanced Algorithms for the IEEE 802.11p Deployment in Vehicular Ad Hoc Networks

Yamen Y. Nasrallah, I. Al-Anbagi, H. Mouftah
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引用次数: 11

Abstract

The Enhanced Distributed Channel Access (EDCA) and the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) algorithms are used in the IEEE 802.11p standard to support Quality of Service (QoS) and reliable communication in Vehicular Ad hoc Networks (VANETs). An essential part of the CSMA/CA process is when a packet in an Access Category (AC) waits for an Arbitrary Inter- Frame Space (AIFS) period of time before engaging in the the backoff phase. According to the standard, AIFS values are fixed and deterministic, they do not guarantee strict priority for ACs especially when these values are combined with the Contention Window (CW) size of the backoff phase. On the other hand, the AIFS values are not adjustable, they do not adapt to the current status of the medium. In this paper, we propose two algorithms for AIFS value assignment, the Strict Priority Algorithm (SPA) and the Adaptive AIFS Algorithm (A3). With SPA, the AIFS values are fixed, but they are determined according to a mathematical formula that ensures strict priority level among the ACs. With A3, the AIFS values are adaptively changing depending on the value of the collision probability. AIFS still maintains a strict priority level assignment among the ACs.
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车载Ad Hoc网络中IEEE 802.11p部署的改进算法
IEEE 802.11p标准中使用增强型分布式信道接入(EDCA)和带避免碰撞的载波感知多址接入(CSMA/CA)算法来支持车载自组织网络(vanet)中的服务质量(QoS)和可靠通信。CSMA/CA过程的一个重要部分是当访问类别(AC)中的数据包在参与回退阶段之前等待任意帧间空间(AIFS)时间段。根据标准,AIFS值是固定的和确定的,它们不能保证ac的严格优先级,特别是当这些值与回退阶段的争用窗口(CW)大小相结合时。另一方面,AIFS值是不可调节的,它们不适应介质的当前状态。本文提出了两种AIFS赋值算法:严格优先级算法(SPA)和自适应AIFS算法(A3)。使用SPA时,AIFS值是固定的,但它们是根据一个数学公式确定的,该公式确保了ac之间严格的优先级。对于A3, AIFS值根据碰撞概率的值自适应变化。AIFS在ac之间仍然保持严格的优先级分配。
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