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Like most wireless network protocols, IEEE 802.15.4 adopts a CA (Congestion Avoidance) algorithm to avoid early collisions of new frames by randomizing its first transmission delay instead of delivering them immediately. The traditional CA scheme of IEEE 802.15.4 selects its random access time from the predetermined range without considering the degree of underlying network congestion. This static...
Deployment of large-scale wireless sensor networks poses a number of new problems not foreseen in previous networking scenarios. One of the main issues to be addressed in such networks is to grant fair and efficient channel access to a large number of network nodes. Although it has been shown that CSMA/CA presents some limitations in this regard, it continues to be the adopted solution for channel...
This paper proposes a heartbeat radio access protocol for a mobile ad-hoc network based on a random access protocol using a high-throughput and stable single-channel Q-ary free-access collision resolution algorithm. We provide an analytical derivation of the performance of this free-access collision resolution algorithm in the presence of feedback channel errors that may be present in the mobile radio...
In this paper, a new backoff algorithm based on sliding the backoff interval is proposed to maximize the channel throughput and improve the fairness of random access channels. In the sliding backoff interval (SB) algorithm, every node that experiences packet collisions increase its SB range by a forward sliding factor (FSF) and in case of successful transmission decrease its SB range by a backward...
The WiMAX technology based on IEEE 802.16 is expected to support multimedia services with guaranteed quality of service (QoS). In this paper, a scheduler structure with priority classes is designed for IEEE 802.16 wireless networks, and a channel quality dependent rate-limited (CD-RL) algorithm is proposed. CD-RL provides promised data rates while taking throughput into account. With a carefully designed...
We design a resource allocation algorithm for downlink of orthogonal frequency division multiple access (OFDMA) systems supporting real-time (RT) and best-effort (BE) services simultaneously over a time-varying wireless channel. The proposed algorithm aims at maximizing system throughput while satisfying quality of service (QoS) requirements of the RT and BE services. We take two kinds of QoS requirements...
We propose analytic model to compute the delay of the binary exponential backoff (BEB) protocol as a collision resolution algorithm. When a packet which tries to reserve a channel collides n times, it chooses one of the next 2n frames with equal probabilities and attempts the reservation again. We derive the expected access delay until an arbitrary packet reserves a channel. Then the expected transmission...
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