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In this paper, we study the throughput fairness performance in IEEE 802.11 based wireless local area networks (WLANs) without and with successive interference cancellation (SIC) technique. We consider a single rate WLAN with carrier sense multiple access with collision avoidance (CSMA/CA) medium access control (MAC) protocol for MAC layer and a SIC technique at the physical layer. We determine the...
Distributed desynchronization approaches lead to time-division multiple access (TDMA) of the shared medium without requiring a central coordinator. All such methods are based on the principle of reactive listening of periodic fire messages. The advantage of distributed desynchronization (DESYNC-TDMA) is the fact that it comprises a decentralized approach of very low complexity. It is therefore of...
Multi-hop relay network systems are expected to extend the coverage area and improve data transmission rate by deploying some relay stations. Relay selection is one of the most important features for the portable devices to obtain a quality-of-service (QoS) guarantee in such environments. In order to provide reasonable QoS guarantees for multi-hop relay network systems, efficient relay selection scheme...
Information-centric networking (ICN) is a promising approach for wireless communication because users can exploit the broadcast nature of the wireless medium to quickly find desired content at nearby nodes. However, wireless multi-hop communication is prone to collisions and it is crucial to quickly detect and react to them to optimize transmission times and avoid spurious retransmissions. Several...
Underwater wireless sensor networks (UWSNs) are meant to be deployed at the areas that need to be monitored continuously without the human assistance. Therefore, these networks are expected to stay operational for a longer period of time. However, sensor nodes in these networks are equipped with limited energy (e.g., battery) resources. Moreover, uneven energy consumption is one of the biggest challenges...
We propose a routing protocol for drive-thru Internet access in delay tolerant vehicular networks. The contribution of this paper is two-folds. First, we propose a new approach which utilizes the concept of delay tolerant network (DTN) to supplement the conventional communication approach. Second, we propose an algorithm to schedule DTN transmissions in order to maximize the system throughput. The...
This paper proposes the analytical expressions for the IEEE 802.11 string-topology multi-hop networks using Markov-chain model. For achieving that, the proposed analysis procedure includes two proposals, which are: (i) Bianchi's Markov-chain model is modified for considering a relationship between the backoff timer and frame length, and (ii) the interferences, such as hidden node collision and carrier...
Wireless mesh network (WMN) has been proposed to extend wireless coverage by using multi-hop communication to enable network service for mobile devices via densely deployed mesh APs. While modern wireless devices are capable of using multiple WiFi interfaces, the Multipath TCP (MPTCP) protocol has been employed to make full use of the capacity of multiple radios. A key question of MPTCP communication...
This work aims to improve the performance of cooperative relaying in interference-limited multihop networks. The multihop network nodes are equipped with multi-rate and continuous power control capabilities. The existing technique does not yield significant performance gains with multi-rate and power control capabilities. To obtain the achievable throughput rates, a cross-layer flow-based framework...
Agile providing Internet connectivity to the victims right after a disaster occurs is essential to mitigate loss and save people. It is hard, however, to quickly recover communication infrastructures due to many difficulties such as reach ability to the destroyed areas, heavy and wide-area damages requiring a huge amount of resources and human power to recover, and so forth. WiFi based multihop access...
In this paper, we first propose a new cooperative multihop transmission structure for two-way amplify-and-forward (AF) relay networks, in which multiple single-antenna relays are considered and distributed between two sources. With the proposed transmission structure, a multihop network can be decomposed into several independent two-way two-hop AF relay systems. Based on the structure characteristics,...
End-to-end outage probability and end-to-end throughput are analyzed in a multi-hop channel with truncated automatic repeat request type-I (ARQ-I). The system is modelled as a Markov chain and the closed-form expressions for the outage and throughput are derived for the cases of variable and equal distances between the nodes. The limits on the performance in high SNR and large number of transmissions...
A novel dual channel multiple access (DCMA) protocol is proposed for multihop wireless networks to efficiently resolve hidden and exposed terminal problems and improve the probability of concurrent packet transmissions. By optimizing the slots on control channel and data channel, DCMA can achieve optimal transmission balance, and concurrent reservation access and collision-free data packet transmissions...
This paper considers reliable multihop transmission under routing attacks, where a malicious relay can modify or drop a packet as it is being forwarded to the destination. We propose a transmission scheme that detects malicious nodes launching routing attacks through incorporating diversity over multi-layer relays, where each relay can establish a direct connection with relays at preceding and succeeding...
Cellular relaying architecture is in an early stage for development and deployment. A restricted number of deployment scenarios are addressed in the LTE-A relay standard, though different design options in alternative deployment scenarios do potentially exist. Presently, the LTE-A relay standard is restricted to a single-hop relaying. The principal reason for opting for this architecture is to minimize...
Multi-carrier High Speed Downlink Packet Access (HSDPA) technology, in Universal Mobile Telecommunications Service Cellular Networks (UMTS), allows efficient Radio Resource Management (RRM) of spreading codes, transmission power, and interference rise per carrier. However, poor radio network planning and configuration parameters can limit HSDPA system capacity, measured in terms of average user throughput...
This paper presents an analysis of the factors affecting coverage and capacity estimation in cellular networks of third generation (3G) technology using wideband code division multiple access (WCDMA). Particularly in WCDMA systems, the main source of interference by coverage is the overlapping between cells, affecting the capacity of system. To analyze the factors affecting the capacity of a WCDMA...
In the last few years numerous connected vehicular applications and services have been developed. Most of them reside in the infotainment domain, but safety-critical use cases are within the scope of current realizations. As the performance of the wireless link has a major influence on the applications' reliability and functionality, it is important to consider its characteristics as early as possible...
Back-pressure algorithm for queueing network can lead to maximum network throughput and is robust to time-varying network conditions, which has raised considerable attention recently due to the scarcity of wireless bandwidth resources. However, it may result in large end-to-end (e2e) delay and a waste of network resources, particularly when the network loads are light or moderate. The reason is that...
This paper evaluates throughput characteristics of a multi-hop network, where a relay node itself has own traffic as well as relays transit traffic. In addition, it also has an individual per-flow scheduling such as weighted round-robin scheme to send transit and own data farther. The best route is determined in terms of various QoS criteria such as total throughput and relay node throughput. Novelty...
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