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Service discovery (SD) has been a hot research topic for several years, while few efforts have been made in theoretical analyses. Only one paper concerned the modeling of the decentralized SD in Ad-hoc networks. However, the traffic load caused by broadcasting restricts the adoption of decentralized architectures across the Internet. The purpose of this paper is to propose an analytical model for...
Cross-layer design has been drawing much attention recently. However, few works are related to how traditional power control schemes, like single-step and multiple-step power control schemes, affect the queueing performance. In light of this, we will compare the queueing performance of single-step and multiple-step power control schemes in finite state Markov channel (FSMC) through simulation in this...
IEEE 802.11 WLAN has been widely accepted throughout the world. However, it has large overhead due to idle backoff slots and frequent collisions depending on the number of nodes. In this paper, we propose a novel medium access control scheme, scheduling-based coordination function (SCF). SCF polls the next station to be serviced by piggybacking. The selection of the next station is based on self-clocked...
Performance comparison of multiuser OFDM-TDMA and OFDMA systems by considering physical and link cross-layer behavior is conducted in this work. We provide a new framework for performance evaluation that centers on "scheduling" with several different subcarrier/bit allocation schemes. The performance metrics include: the bit rate, the bit error rate (BER), packet throughput and delay. The...
IEEE 802.11 DCF mode is a distributed channel access method for standard Wireless Local Area Networks (WLAN) with a goal of providing long-term fair channel access for the nodes. Due to the characteristics of radio signals, such as propagation attenuation and capture effect, WLAN users may experience unfair medium allocations depending on their locations. Our analysis shows that a user near the access...
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