The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The Distributed Coordination Function (DCF) of IEEE 802.11 is one of most commonly used MAC protocol in channel-shared wireless network, but it can't support differentiated services among various applications. In this paper, a novel probability back-off MAC protocol is proposed to provide service differentiation as well as enhance the overall system throughput. We analyze our scheme by using a Markov...
A MAC mechanism of supporting integrated voice and data service in ad hoc networks is presented. The state transition diagram of the proposed mechanism is described, and then throughput and packet time delay performances are analyzed by using Markov model. Moreover, performances comparison between the proposed mechanism and 802.11 DCF are made. Numerical results show that the proposed MAC mechanism...
The distributed coordination function is one of three channel access control protocols specified by the IEEE 802.11 standard. In this paper we present a method of measuring DCF performance using a test bed built with off-the-shelf hardware. Performance is measured by normalized aggregate throughput as a function of the number of stations contending for channel access. We present measurements for both...
Wireless LANs have achieved a tremendous amount of growth in recent years. During this time, user requirements have evolved, so it is necessary to have differentiation mechanisms in the access networks to achieve user requirements. WLAN standard IEEE 802.11 doesn't provide any differentiation between different services to achieve throughput and delay requirement, this paper propose a new modification...
This paper presents an analytical model for the performance study of IEEE 802.11 distributed coordination function (DCF). The maximum throughput can be achieved well below the saturated load. The analytical model for finite load must be studied to know the performance of the medium access control (MAC) layer below the saturated load. We extend the Bianchipsilas saturation model for the nonsaturated...
The neighbor turn taking (NTT) Medium Access Control (MAC) protocol is a loosely scheduled MAC, whose intended purpose is for use in wireless ad hoc networking environments where the node mobility is low. This protocol has been previously shown via simulation to perform better than IEEE 802.11 in terms of end-to-end packet latency and rate of successfully transmitted packets under saturated conditions...
A mechanism named virtual collision mechanism (VCM) was proposed to improve IEEE 802.11 distributed coordination function's (DCF) performance, in which a super slot includes two slots. This paper extends the 2-slot VCM into multi-slot VCM and proposes the multi-slot VCM's model, in which a super slot includes several slots. Plenty of simulations and analysis are carried out to evaluate the multi-slot...
Based on the protocol of IEEE 802.11 for ad hoc networks, the distributed coordination function (DCF) of ad hoc networks was modified, and an adaptive minimum contention window binary exponential backoff algorithm (AWBEB algorithm) was presented. We use a 2D Markov chain model to educe the stationary distribution probabilities and the probability that a given node will transmit in an arbitrary time...
The limited number of orthogonal channels and autonomous installations of hot spots and home wireless networks often leave neighboring 802.11 basic service sets (BSSs) operating on the same or overlapping channels, therefore interfering with each other. However, the 802.11 medium access control (MAC) does not work well in resolving inter-BSS interference due to the well-known hidden/exposed-receiver...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.