منابع مشابه
A Reservation-Based Enhancement of IEEE 802.11 DCF Protocol
IEEE 802.11 DCF is an asynchronous and distributed MAC protocol which does not require the existence of a central controller for medium access coordination. This flexibility, which is due to DCF’s contention-based nature, comes at the expense of the overhead associated with contention resolution. The overhead consists of frame collision time and channel idle time, which is particularly severe w...
متن کاملA Priority Scheme for IEEE 802 . 11 DCF Access Method ∗
SUMMARY IEEE 802.11 is a standard for wireless LANs. The basic access method in its MAC layer protocol is the distributed coordination function (DCF) for the ad hoc networks. It is based on the mechanism of carrier sense multiple access with collision avoidance (CSMA/CA). DCF is used to support asyn-chronous data transmission. However, frames in DCF do not have priorities, making it unsuitable ...
متن کاملDenial of Service Attacks against 802.11 Dcf
This paper investigates the vulnerabilities in the 802.11 Distributed Coordination Function (DCF) mechanisms. We have conducted a series of Denial of Service (DoS) attack experiments targeting at the 802.11 DCF and evaluated the effectiveness of such attacks on different configurations. The results show that any current or upcoming 802.11 standards would not provide adequate help to mitigate th...
متن کاملDCF-S: A Dynamic Coalition Formation Scheme for Rational Agents
We introduce the notion, issues, and challenges of dynamic coalition formation (DCF) among agents in open, heterogeneous and world widely distributed environments. Results achieved in the traditional field of static coalition formation are briefly discussed, as well as the desired results in the new research field of DCF. We propose a simulation-based DCF scheme, called DCF-S, to be applied to ...
متن کاملDomain term relevance through tf-dcf
This paper proposes a new index for the relevance of terms extracted from domain corpora. We call it term frequency, disjoint corpora frequency (tf-dcf ), and it is based on the absolute term frequency of each term tempered by its frequency in other (contrasting) corpora. Conceptual differences and mathematical computation of the proposed index are discussed in respect with other similar approa...
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ژورنال
عنوان ژورنال: Vezetéstudomány / Budapest Management Review
سال: 2011
ISSN: 0133-0179
DOI: 10.14267/veztud.2011.07.01