نتایج جستجو برای: contention window
تعداد نتایج: 70733 فیلتر نتایج به سال:
We consider greedy contention managers for transactional memory for M ×N excution windows of transactions with M threads andN transactions per thread. Assuming that each transaction conflicts with at most C other transactions inside the window, a trivial greedy contention manager can schedule them within CN time. In this paper, we show that there are much better schedules. We present and analyz...
The backoff protocol is widely used for sharing a common channel among several stations in communication networks. The Binary Exponential Backoff (BEB) improves the system throughput but increases the capture effect, permitting a station to seize the channel for a long time. In this paper, we introduce and analyze a new class of adaptive backoff protocols where a station changes its contention ...
Contention based bandwidth request mechanism is suggested for best effort services in WiMAX networks. The design of contention mechanism depends on the error model that reflects the transmission failure. In this paper, we have developed an error model by integrating the collisions due to contention, unavailability of bandwidth and channel error. The conventional exponential increase and exponen...
The IEEE 802.11e standard has been introduced recently for providing Quality of Service (QoS) capabilities in the emerging wireless local area networks. This standard introduces a contention window based Enhanced Distributed Channel Access (EDCA) technique that provides a prioritized traffic to guarantee the minimum bandwidth needed for time critical applications. However, the EDCA technique re...
Abstract—It has been widely recognized that bistable behavior of random access protocols may suddenly deteriorate the performance of the system due to the unexpected slip into an undesired stable operating point. The catastrophe theory succeeds in presenting the bistable region of random access protocols, where packet retransmissions occur in a memoryless manner. In this correspondence, the sta...
In the design of wireless networks the medium access control (MAC) protocols have a very high impact on the performance of the network. The IEEE 802.11 is widely accepted technology for the Wireless LANs has been used by wireless networks. Delay is one of the important parameter to measure the performance of the wireless networks. We give a delay analysis of the Distributed Coordination Functio...
Channel state estimation-based backoff algorithms for channel access are being widely studied to solve wireless channel accessing and sharing problem especially in super dense wireless networks. In such algorithms, the precision of the channel state estimation determines the performance. How to make the estimation accurate in an efficient way to meet the system requirements is essential in desi...
Wireless Sensor Networks (WSNs) are one of the fastest growing and emerging technologies in the field of Wireless Networking today. The applications of WSNs are extensively spread over areas like Military, Environment, Health Care, Communication and many more. These networks are powered by batteries and hence energy optimization is a major concern. One of the factors that reduce the energy effi...
This paper studies TCP performance over multihop wireless networks that use the IEEE 802.11 protocol as the access method. Our analysis and simulations show that, given a specific network topology and flow patterns, there exists a TCP window size W , at which TCP achieves best throughput via improved spatial channel reuse. However, TCP does not operate around W , and typically grows its average...
The IEEE DCF 802.11 is currently used as WLAN standard. The standard specifies the contention-based MAC mechanism, Distributed Coordination Function (DCF), which allows to share the wireless channel. In the DCF each node picks a random contention slot from the uniform distribution over the [lower bound, upper bound] interval, where the lower bound always equals 0 and the upper bound equals an i...
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