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Transmission or communication range is an important factor for successful data delivery in wireless communications including multi-hop wireless networks. Typically, transmission range can be technically adjustable by configuring the transmitting power (Tx Power) or changing the antenna height. For the same antenna height, if transmission range is minimized or adjusted to be shorter by lowering Tx...
Multi-hop wireless sensor networks (WSN) have many applications in nowadays' environment monitoring. However, it is very challenging to predict the throughput for an arbitrary multi-hop wireless sensor network with different source data rates. In this paper, we propose an iterative decomposition method for this purpose. We first identify a limited number of basic network configuration of chain topology...
Performance evaluation of IEEE 802.11 multi-hop wireless networks has been drawing significant attention in recent years whereas most studies ignore the interfering noise far away. However, since the packets may overlap in time in multi-hop wireless networks, the cumulative energy of the noise coming from far away can be high enough to affect the performance of the network. In this paper, we investigate...
In wireless multi-hop networks, content servers are generally located outside a wireless multi-hop network and a user accesses these servers through a gateway node. So, content traffic has a tendency to be concentrated at a gateway node, which might cause throughput degradation in a whole wireless multi-hop network. Caching network is one promising way to resolve this technical problem. However, caching...
Carrier aggregation and multi-flow transmission are among the most important features of HSPA+. While the former allows users to be served simultaneously by several carriers in the same sector, the latter enables adjacent sectors to simultaneously schedule different data streams to the same user in their overlapping region. In this paper, we investigate the inter-operation of these two features. We...
3G networks penetration is increasing in China, particularly on mobile devices, but little is known about the performance in the country. In this paper, the WCDMA and CDMA's uplink broadband performance was measured in Nanjing. Content of the measuring include throughput, packet loss, delay and receiving interval. Through testing, we can identify the relationship between uplink packet loss, delay...
In a multi-rate wireless data network, the data rate is a function of the distance from the Access Point (AP). To extend the coverage range of the data network and to increase the throughput to a target terminal outside the AP coverage range, relay nodes are inserted between the AP and the target terminal. Therefore, for a given throughput-distance relationship, and a given distance between the access...
The scaling laws for the throughputs of cognitive network with transmission power of secondary users being constrained are studied. The primary nodes and secondary nodes are randomly and uniformly distributed over the same unit square, with density of n and m (n > m). In this paper, we propose a new hybrid access scheme of multi-hop cognitive network, with primary users and secondary users using...
To enhance the QoS performance in saturated multihop adhoc networks, it is essential to have cooperative algorithms for MAC layer contention resolution and TCP layer congestion control. This paper proposes a cross layer approach that modifies the back off mechanism and congestion control technique using Fibonacci sequence. Due to the golden section property of Fibonacci sequence, contention and congestion...
Development and deployment of underwater acoustic (UWA) sensor networks have emerged as an efficient solution for many applications related to marine environment e.g., scientific, industrial, and military operations. The main tasks to execute are remote sensing and monitoring. Grid topology with multihop relaying is very useful, since it allows a wide area coverage as well as long distance data transmission...
In a multi-rate wireless data network, the data rate is a function of the distance from the Access Point (AP). To extend the coverage range of the data network and to increase the throughput to a target terminal outside the AP coverage range, relay nodes are inserted between the AP and the target terminal. Therefore, for a given throughput-distance relationship and a given distance between the access...
A new slotted split-channel medium access control (SSC-MAC) protocol is proposed for multihop wireless networks to maximize concurrent packet transmissions. By adjusting the relationship between the reservation slot (RS) on the control channel (CCH), data packet transmission slot (TS) on the data channel (DCH) and acknowledgment slot (AS) on the acknowledgment channel (ACH), the channel reservation,...
Nowadays the deployment of the Wireless Local Area Network (WLAN) is under the limelight of the academic community. In a multi-rate data WLAN, the data rate is a function of the distance from the access point (AP). To extend the coverage of the AP to cover a target terminal outside the AP coverage area, relay nodes are deployed between the AP and the target terminal. Therefore, for a given relationship...
Traffic in WMNs has a wide range of variations which contributes to channel saturation and may bring up congestion due to contention caused by concurrent transmission, buffer overflows and time varying wireless channel condition. In this paper, we propose a distributed congestion control scheme for wireless mesh networks to ensure higher network throughput while avoiding congestion and maintaining...
Device-to-device (D2D) communication underlaying a cellular network is a promising technology in the future wireless networks to improve network capacity and user experience. In current works, D2D communications are considered as two user equipments (UEs) communicating directly without going through the central base station (BS). In fact, D2D communications can be further broadened to multi-hop D2D...
Wireless Body Area Networks (WBANs) are playing promising role in healthcare field by allowing remote monitoring of patients. In such networks, designing a energy efficient routing topology is of main concern. For this purpose, we propose CEMob, Critical data transmission in Emergency with Mobility support in WBANs, as a routing layer protocol. CEMob avoid continuous transmission of information, thereby,...
The IEEE 802.11 protocols are used by millions of smartphone and tablet devices to access the Internet via Wi-Fi wireless networks or communicate with one another directly in a peer-to-peer mode. Insider attacks are those originating from a trusted node that had initially passed all the authentication steps to access the network and then got compromised. A trusted node that has turned rogue can easily...
MANET or mobile adhoc network is that network which is infrastructure less and does not need any centralized support. In this network, mobile nodes are equipped with CSMA/CA (carrier sense multiple access with collision avoidance) transceivers and communicate with each other via radio. This network is a kind of temporary network and is best suited for emergency purposes. Since, nodes are always on...
We characterize the secrecy level of communication under Uncoordinated Frequency Hopping, a spread spectrum scheme where a transmitter and a receiver randomly hop through a set of frequencies with the goal of deceiving an adversary. In our work, the goal of the legitimate parties is to land on a given frequency without the adversary eavesdroppers doing so, therefore being able to communicate securely...
This paper presents a mathematical model for slotted Aloha-based multihop wireless ad hoc network with ZigZag decoding. We aim by using ZigZag decoding to exploit collision that occurs due to simultaneous transmissions or hidden nodes, in order to decode involved packets by through an iterative piece-by-piece algorithm. Now, the channel state (which we confound with the transmission issue) either...
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