Delay Performance Analysis and Evaluation of IEEE 802.11e EDCA in Finite Load Conditions

Vassis, Dimitris; Kormentzas, George

doi:10.1007/s11277-005-8725-y

Cited by 24 publications

(8 citation statements)

References 17 publications

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“…This dimension controls the maximum allowed time and the dropping decision will be taken depending on these values. The resulting model is in non-saturation mode, and is similar to the models obtained in [2], [5], [6], [13], [11], and [14]. This model is designed to consider the intentional dropping, which is achieved through the inclusion of service differentiation parameters.…”

Section: A Transition Diagrammentioning

confidence: 97%

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Analysis of a new delay enabled EDCF for voice transport over IEEE802.11e

Rikli

Al-Rashed

2010

International Conference on Computer and Communication Engineering (ICCCE'10)

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A new subfunction for the IEEE 802.11e EDCF allowing efficient transport of real-time traffic is proposed. The delay induced by the freezout of the backoff counter is to be considered. Intentional dropping is used if a certain threshold delay is exceeded. A system enabled with this suggested feature is analyzed and the impact of backoff parameters on the transmission probability, the dropping probability, the transmission delay, in addition to the throughput will be evaluated. The required equations of the Markov chain will be derived, in addition to the equations for delay and throughput.

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Section: A Transition Diagrammentioning

confidence: 97%

“…It is simply, the complement of the probability that all stations do not transmit except one. It is defined in terms of the transmission probability t i and the number of station N i from the same class, and t j and N j from all other L classes [2] [11]. It is given by:…”

Section: F Collision Probabilitymentioning

confidence: 99%

Analysis of a new delay enabled EDCF for voice transport over IEEE802.11e

Rikli

Al-Rashed

2010

International Conference on Computer and Communication Engineering (ICCCE'10)

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“…Upon transmission failure, a source attempts retransmission of a packet until it successfully reaches the destination. Since in the system under consideration, the probability of successful transmission during a time slot depends only on channel characteristics, the number of retransmission attempts is independent of collision probability and follows a geometric distribution [71,72]. Let random variables M and M coop represent the packet transmission delay of ADHOC MAC and CAH-MAC respectively.…”

Section: Packet Transmission Delaymentioning

confidence: 99%

Link-Layer Cooperative Communication in Vehicular Networks

Bharati¹

2018

Wireless Networks

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Vehicular ad hoc networks (VANETs) are a special kind of communication networks and possess unique characteristics as compared with general mobile ad hoc networks (MANETs), where vehicles communicate with each other or with stationary road side units. Hence, directly applying the existing communication protocols designed for MANETs may not be reliable and efficient in VANETs. Thus, this thesis presents link-layer cooperative frameworks to improve transmission reliability and network throughput over distributed TDMA MAC 1 protocols for VANETs.We present a link-layer node cooperation scheme for VANETs, referred to as Cooperative ADHOC MAC (CAH-MAC). In CAH-MAC, neighboring nodes cooperate to utilize unused time slots to retransmit failed packets. Throughput improvement is achieved by using idle time slots that are wasted in the absence of node cooperation. In addition, as a packet is retransmitted earlier by a relay node, transmission delay and packet dropping rate are reduced. We study the effects of a dynamic networking environment on the performance of CAH-MAC. It is observed that, system performance degrades due to cooperation collisions. To tackle this challenge, we present an enhanced CAH-MAC (eCAH-MAC) scheme. In eCAH-MAC, using different types of packet and by delaying or suspending some relay transmissions, cooperation collisions can be avoided and cooperation opportunities can be efficiently utilize without disrupting the normal operations of the distributed TDMA MAC.We propose a node cooperation based makeup strategy for vehicular networks, referred to as cooperative relay broadcasting (CRB), such that neighboring nodes proactively rebroadcast the packet from a source node. An optimization framework is developed to provide an upper bound on the CRB performance with accurate channel information. Further, we propose a channel prediction scheme based on a two-state first-order Markov chain, to select the best relaying node for CRB. As packets are repeatedly broadcasted by the neighboring nodes before they expire, the proposed CRB framework provides a more reliable broadcast service as compared with existing approaches.The proposed node cooperation frameworks enhance the performance of distributed TDMA MAC and make it more robust to tackle VANET's dynamic networking conditions.

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“…Many on-going research efforts are focusing on the evaluation of the IEEE 802.11e standard [6][7][8]. Many studies have revealed that the poor performance exhibited by the standard is mainly due to the high collision rates encountered when a large number of stations attempt to access the channel.…”

Section: Qos Enhancements To the Ieee 80211ementioning

confidence: 99%

Multiservice unicast/multicast communications over IEEE 802.11e networks

et al. 2009

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Wireless communications are nowadays one of the most active research and development areas in telecommunications. The widespread use of wireless networks and the development of high-rate infrastructure are in turn enabling the introduction and deployment of many new enduser applications. During the past few years, the IEEE 802.11e (EDCA) standard has been working on defining the required QoS mechanisms to be incorporated into the IEEE 802.11 protocol architecture. However, recent studies have shown that EDCA performs poorly when the medium is highly loaded due to the high collision rate. Numerous proposals have been reported in the literature aiming to overcome this main drawback. However, EDCA and the proposed mechanisms continue to have a serious problem with a specific type of application: the multicast traffic. In EDCA (as in DCF) the multicast service is defined as an unreliable service, i.e., it does not include the use of ACK frames. Furthermore, different to the unicast service, the multicast service makes use of a single rate out of the various rates included in the Basic Service Set (BSS) defined by the IEEE 802.11 standard. This situation has led many researchers to J. Villalón ( ) · P. Cuenca · L. design techniques aiming to improve the multicast transmission. In this paper, we analyze the inter-operability of two prominent multicast mechanisms recently reported by the authors and the channel access method defined by the IEEE 802.11e EDCA standard. We further consider the use of B-EDCA: an enhanced version of EDCA recently introduced by the authors. We carried a comparative performance evaluation of the aforementioned mechanisms when supporting unicast and multicast traffic. Our simulation results show the effectiveness of the enhanced protocol architectures when jointly supporting unicast and multicast traffic.

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Delay Performance Analysis and Evaluation of IEEE 802.11e EDCA in Finite Load Conditions

Cited by 24 publications

References 17 publications

Analysis of a new delay enabled EDCF for voice transport over IEEE802.11e

Analysis of a new delay enabled EDCF for voice transport over IEEE802.11e

Link-Layer Cooperative Communication in Vehicular Networks

Multiservice unicast/multicast communications over IEEE 802.11e networks

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