scholarly journals Performance of symmetric and asymmetric links in wireless networks

2022 ◽  
Vol 12 (1) ◽  
pp. 605
Author(s):  
Yaesr Khamayseh ◽  
Rabiah Al-qudah
Keyword(s):  
Wireless Networks ◽  
Mobile Networks ◽  
Network Performance ◽  
Allocation Scheme ◽  
Simulation Experiments ◽  
Extensive Simulation ◽  
Resource Allocation Scheme ◽  
Fully Connected ◽  
The Impact ◽  
Asymmetric Links

<p>Wireless networks are designed to provide the enabling infrastructure for emerging technological advancements. The main characteristics of wireless networks are: Mobility, power constraints, high packet loss, and lower bandwidth. Nodes’ mobility is a crucial consideration for wireless networks, as nodes are moving all the time, and this may result in loss of connectivity in the network. The goal of this work is to explore the effect of replacing the generally held assumption of symmetric radii for wireless networks with asymmetric radii. This replacement may have a direct impact on the connectivity, throughput, and collision avoidance mechanism of mobile networks. The proposed replacement may also impact other mobile protocol’s functionality. In this work, we are mainly concerned with building and maintaining fully connected wireless network with the asymmetric assumption. For this extent, we propose to study the effect of the asymmetric links assumption on the network performance using extensive simulation experiments. Extensive simulation experiments were performed to measure the impact of these parameters. Finally, a resource allocation scheme for wireless networks is proposed for the dual rate scenario. The performance of the proposed framework is evaluated using simulation.</p>

scholarly journals Impact of Wireless-Powered Communications in Coexisting Mobile Networks

2020 ◽  
Author(s):  
Luis Irio ◽  
Rodolfo Oliveira ◽  
Daniel B. da Costa ◽  
Mohamed-Slim Alouini
Keyword(s):  
Wireless Networks ◽  
Energy Harvesting ◽  
Outage Probability ◽  
Mobile Networks ◽  
Optimal Harvesting ◽  
Communication Performance ◽  
Mobile Wireless ◽  
Harvesting Process ◽  
The Impact

<pre>In this letter, we investigate the impact of wireless-powered communications when energy is harvested from multiple static and/or mobile wireless coexisting networks.</pre><pre>In a first step, we characterize the aggregate power received by a harvester node when it harnesses the energy generated by the coexisting wireless networks. Considering that the harvester node acts as a transmitter after the harvesting duration, we derive the outage probability for such coexisting scenario. In addition, the throughput achieved by the harvester node is also characterized, and the optimal harvesting duration is identified taking into account the mobility of the coexisting networks, the features of the static networks, the energy harvesting process, as well as the communication performance between the harvester node and the receiver. Our work shows that the distribution of the power received by the harvester from the coexisting networks can be accurately approximated by an $\alpha-\mu$ distribution. Moreover, the mobility also impacts on the optimal throughput of the wireless-powered communications, which is accurately confirmed by the proposed analysis and extensive simulations.</pre>

scholarly journals Impact of buffer size and TTL on DTN routing protocols in intermittently connected mobile networks

2018 ◽  
Vol 7 (3) ◽  
pp. 1735 ◽  
Author(s):  
Md. Sharif Hossen ◽  
Md. Masum Billah ◽  
Suraiya Yasmin
Keyword(s):  
Mobile Networks ◽  
Routing Protocols ◽  
Network Performance ◽  
Performance Metrics ◽  
Limited Resources ◽  
Buffer Size ◽  
Delivery Ratio ◽  
Dtn Routing ◽  
The Impact ◽  
Intermittently Connected

Delay-Tolerant Networks (DTNs) are kinds of networks where there does not exist any complete end-to-end route from source to destination. Such networks can also be referred to as Intermittently Connected Mobile Networks (ICMNs), which are featured by asymmetric data rates, large delay, limited resources and high error rates. In this network, size of buffer and Time-to-Live (TTL) for fixed number of nodes and message generation rates contribute to the network performance because of limited resources and short life span of a packet in the net-work. Therefore, investigating efficient routing for altering TTL and size of buffer is very important for overall network performance. This paper presents a performance analysis based on simulation of the impact of buffer size and TTL for several DTN routing protocols in ICMNs scenario. ONE, i.e., Opportunistic Network Environment is used to simulate the routing protocols considering three performance metrics: delivery ratio, mean latency and overhead ratio. Investigated results mention that Spray-and-Focus (SNF) routing exhibits the best performance for altering TTL and size of buffer than other DTN routing protocols, i.e., Epidemic, PRoPHET, PRoPHETv2, MaxProp, RAPID, and Binary-SNW in the considered performance metrics and simulation scenario. 

Geometric Programming Based Resource Allocation for 5G High-Speed Mobile Networks

2017 ◽  
pp. 228-245
Author(s):  
Shaoyi Xu ◽  
Tianhang Fu
Keyword(s):  
Resource Allocation ◽  
Time Delay ◽  
Power Allocation ◽  
Mobile Networks ◽  
Mobile Communications ◽  
Geometric Programming ◽  
High Speed ◽  
Allocation Scheme ◽  
Delay Constraint ◽  
Resource Allocation Scheme

The high-speed railway (HSR) is a typical application case in 5G systems. Mobile relay stations (MRSs) which are mounted in a high-speed train (HST) is popular system architecture for high-speed mobile communications. However, sharing spectrums between the macro cell and the MRS cell, interference exists in this hybrid system. In this chapter, we investigate the downlink of a multi-cellular decode and forward (DF) relayed orthogonal frequency division multiple access (OFDMA) system and formulate the problem to maximize the system sum rate of all cells subject to a total power constraint and a new proposed time delay constraint. An effective resource allocation scheme combined by greedy sub-carriers allocation and geometric programming (GP) based power allocation algorithm is proposed to optimize subcarrier allocation and power allocation. Numerical experiments verify that the proposed resource allocation scheme outperforms the other traditional approaches and the necessity of introducing the time delay constraint.

Geometric Programming Based Resource Allocation for 5G High-Speed Mobile Networks

2021 ◽  
pp. 811-828
Author(s):  
Shaoyi Xu ◽  
Tianhang Fu
Keyword(s):  
Resource Allocation ◽  
Time Delay ◽  
Power Allocation ◽  
Mobile Networks ◽  
Mobile Communications ◽  
Geometric Programming ◽  
High Speed ◽  
Allocation Scheme ◽  
Delay Constraint ◽  
Resource Allocation Scheme

The high-speed railway (HSR) is a typical application case in 5G systems. Mobile relay stations (MRSs) which are mounted in a high-speed train (HST) is popular system architecture for high-speed mobile communications. However, sharing spectrums between the macro cell and the MRS cell, interference exists in this hybrid system. In this chapter, we investigate the downlink of a multi-cellular decode and forward (DF) relayed orthogonal frequency division multiple access (OFDMA) system and formulate the problem to maximize the system sum rate of all cells subject to a total power constraint and a new proposed time delay constraint. An effective resource allocation scheme combined by greedy sub-carriers allocation and geometric programming (GP) based power allocation algorithm is proposed to optimize subcarrier allocation and power allocation. Numerical experiments verify that the proposed resource allocation scheme outperforms the other traditional approaches and the necessity of introducing the time delay constraint.

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