A novel MAC protocol with fast collision resolution for wireless LANs

Kwon, Younggoo; Fang, Yuguang; Latchman, Haniph A.

doi:10.1109/infcom.2003.1208923

Cited by 204 publications

(134 citation statements)

References 20 publications

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“…802.11 and FCR MAC [10] protocols in the ns-2 simulator [25] for a Wireless LAN. We use DSSS specifications in our simulation experimentation (see Table 2).…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Note that any user (except transmitting ones) who does not receive RTS/CTS correctly is able to sense that the medium is busy since the interference power received is sufficiently higher than the noise floor. As a result of this mechanism, when a collision occurs, the user identifies the collision and sets its NAV to the Extended IFS (EIFS) [1,10]. After a successful transmission, the collided user also chooses a new backoff from the discrete range [W s , 2W s À 1] and needs to detect a DIFS amount of idle time to reduce its backoff counter.…”

Section: Cooperative Mac Protocolmentioning

confidence: 99%

“…Then, for the case where the number of users is dynamically changing, we compare analytical throughput with throughput values for the parameters obtained by user estimation and by minimum mean square error estimation, as well as throughput of the IEEE 802.11 MAC and throughput of the basic FCR MAC protocol [10], which has the same level of complexity as the C-MAC protocol under homogenous data traffic with heavy load. After that, we investigate the effects of heterogenous load and data traffic.…”

Section: Throughput Analysismentioning

confidence: 99%

“…For example, while W c 4 optimizes throughput when the average packet size is less then or equal to 500 byte, the larger packet sizes, W c 5 is optimal. Next, we compare analytical throughput with throughput values for the parameter obtained by user estimation and minimum mean square error estimation, as well as throughput of the IEEE 802.11 MAC and throughput of the basic FCR MAC protocol [10], when the number of users is dynamically changing during simulations. For the simulations, it is assumed that the lifetime of each user is exponentially distributed, with mean time varying from 0.5 to 30 min.…”

Section: Throughput Analysismentioning

confidence: 99%

“…We compare throughput of the C-MAC with both the IEEE 802.11 MAC and basic FCR MAC [10] protocols. The C-MAC achieves compatible throughput performance with the IEEE 802.11 when the RTS/CTS mechanism is applied, and achieves significantly better performance with the basic access mechanism.…”

Section: Introductionmentioning

confidence: 99%

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A short-term fair MAC protocol for WLANs

Cetinkaya

Yildirim

2008

Ad Hoc Networks

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Designing a medium access control (MAC) protocol that simultaneously provides high throughput and allows individual users to share limited spectrum resources fairly, especially in the short-term time horizon, is a challenging problem for wireless LANs. In this paper, we propose an efficient cooperative MAC protocol with very simple state information that considers only collisions, like the standard IEEE 802.11 MAC protocol. However, contrary to the IEEE 802.11 MAC, the cooperative MAC gives collided users priority to access the channel by assigning them shorter backoff counters and interframe-spaces than users who did not participate in the collision event. In other words, collided users are the only ones allowed to transmit in the following contention period. For the cooperative MAC protocol, we utilize an analytical throughput model to obtain the optimal parameter settings. Simulation results show that the cooperative MAC provides significant improvement in short-term fairness and access delay, while still providing high network throughput.

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“…802.11 and FCR MAC [10] protocols in the ns-2 simulator [25] for a Wireless LAN. We use DSSS specifications in our simulation experimentation (see Table 2).…”

Section: Simulation Resultsmentioning

confidence: 99%

Section: Cooperative Mac Protocolmentioning

confidence: 99%

Section: Throughput Analysismentioning

confidence: 99%

Section: Throughput Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A short-term fair MAC protocol for WLANs

Cetinkaya

Yildirim

2008

Ad Hoc Networks

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A backoff differentiation scheme for contention resolution in wireless converge‐cast networks

Wang

Zhou

Qin

et al. 2012

Concurrency and Computation

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Wireless converge-cast networks (WCNs), such as data collection-based wireless sensor networks, exhibit certain phenomena called funneling effect, where the region close to the sink node is heavily overloaded. In this paper, we identify that the funneling effect occurs not only close to the sink but also within the network region where nodes have collision and induce heavy traffic to relay; we name it hot-spot funneling effect. This paper aims to improve the throughput and fairness of WCNs by mitigating the micro funneling effect. We propose a new mechanism, the backoff differentiation for contention resolution (BDCR), which is targeted to a system-wide high throughput on the basis of the contention resolution mechanism. To achieve high spatial reuses, BDCR divides the network into several regions and does backoff differentiation within each region. Within each backoff differentiation region, the backoff window range is adjusted according to the traffic rate, and at the same time, the backoff values are set with the awareness of the traffic intensity level. All regions share the same algorithm, which uses Kelly's rate control theory and method to allow each sensor to locally adjust its backoff value. One of the key advantages of BDCR is that it is extremely easy to implement. With extensive simulations and testbed experiments, BDCR is proved to achieve much higher throughput over the traditional carrier sense multiple access and some recent media access control protocols in literature, particularly when the network suffers intensive congestions.

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Virtual reservation scheme for supporting CBR multimedia services with strict QoS performance over WLAN and wireless mesh

Ohayon

2012

Int J Communication

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SUMMARY Carrier sense multiple access and its variants have been widely used in mobile ad hoc networks. However, most existing access mechanisms cannot guarantee quality of service for real‐time traffic. In this paper, we present a novel approach to guarantee the performance of real‐time applications such as voice and video that require periodic access to the wireless local area network (WLAN) channel. Our approach can work either with distributed coordination function or enhanced distributed coordination function, and includes distributed reservations of time slots between the stations sharing the WLAN without the need to send any signaling or control messages. Stations can access the wireless medium only if they are able to complete the frame transmission without interruption to the reserved slots of existing real‐time sessions. Simulation results indicate that the proposed mechanism provides high channel utilization, and bounded delays and jitter for real‐time traffic. Copyright © 2009 John Wiley & Sons, Ltd.

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A novel MAC protocol with fast collision resolution for wireless LANs

Cited by 204 publications

References 20 publications

A short-term fair MAC protocol for WLANs

A short-term fair MAC protocol for WLANs

A backoff differentiation scheme for contention resolution in wireless converge‐cast networks

Virtual reservation scheme for supporting CBR multimedia services with strict QoS performance over WLAN and wireless mesh

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