scholarly journals A DiffServ Architecture for QoS-Aware Routing for Delay-Sensitive and Best-Effort Services in IEEE 802.16 Mesh Networks

2011 ◽  
Vol 2011 ◽  
pp. 1-13 ◽  
Author(s):  
Ishita Bhakta ◽  
Sandip Chakraborty ◽  
Barsha Mitra ◽  
Debarshi Kumar Sanyal ◽  
Samiran Chattopadhyay ◽  
...  
Keyword(s):  
Mesh Networks ◽  
Network Connectivity ◽  
Ieee 802.16 ◽  
Mesh Network ◽  
Routing Metric ◽  
Hop Count ◽  
Best Effort ◽  
Real Time Traffic ◽  
Delay Sensitive ◽  
Diffserv Architecture

In today's networks, the widespread use of real-time traffic such as video and audio applications demand special service guarantee in terms of throughput, delay, and jitter, thus making quality of service (QoS) a key problem. IEEE 802.16 mesh networks are likely to be the basis of next-generation last mile network connectivity. So, providing QoS is one of the major designing goals in IEEE 802.16 mesh network. While the standard defines five service classes for PMP mode, no standard defined service classes exist for mesh mode. In this paper, we describe a differentiated service (DiffServ) architecture for QoS support in IEEE 802.16 mesh network by considering a basic requirement for QoS guarantee—delay. A new cross-layer routing metric is proposed, namely, expected scheduler delay (ESD). An efficient distributed scheme is proposed to calculate ESD and route the packets using source routing mechanism. This scheme is capable of differentiating between delay sensitive and best-effort traffic and route packets accordingly. Finally, the results of the proposed scheme are compared with the standard schemes that take hop count as a routing metric.

COORDINATED DISTRIBUTED SCHEDULING IN WIRELESS MESH NETWORK

2012 ◽  
Vol 3 (3) ◽  
pp. 368-374
Author(s):  
Usha Kumari ◽  
Udai Shankar
Keyword(s):  
Network Performance ◽  
Mesh Networks ◽  
Mac Protocol ◽  
Scheduling Algorithm ◽  
Ieee 802.16 ◽  
Distributed Scheduling ◽  
Mesh Network ◽  
Fourth Generation ◽  
Network Nodes ◽  
Wireless Mesh

IEEE 802.16 based wireless mesh networks (WMNs) are a promising broadband access solution to support flexibility, cost effectiveness and fast deployment of the fourth generation infrastructure based wireless networks. Reducing the time for channel establishment is critical for low latency/interactive Applications. According to IEEE 802.16 MAC protocol, there are three scheduling algorithms for assigning TDMA slots to each network node: centralized and distributed the distributed is further divided into two operational modes coordinated distributed and uncoordinated distributed. In coordinated distributed scheduling algorithm, network nodes have to transmit scheduling message in order to inform other nodes about their transfer schedule. In this paper a new approach is proposed to improve coordinated distributed scheduling efficiency in IEEE 802.16 mesh mode, with respect to three parameter Throughput, Average end to end delay and Normalized Overhead. For evaluating the proposed networks efficiency, several extensive simulations are performed in various network configurations and the most important system parameters which affect the network performance are analyzed

Open Threads-Enabled Mesh Networks in Vehicles for Real-Time Traffic Monitoring

2020 ◽  
pp. 120-143
Author(s):  
Parul Choudhary ◽  
Rakesh kumar Dwivedi ◽  
Umang Singh
Keyword(s):  
Traffic Congestion ◽  
Communication Systems ◽  
Mesh Networks ◽  
Traffic Monitoring ◽  
Mesh Network ◽  
Real Time Traffic ◽  
Innovative Solutions ◽  
Efficient Communication ◽  
Adaptive Solution ◽  
Inter Communication

The exponential increase of traffic on roads has led to numerous disastrous consequences. These issues demand an adaptive solution that ensures road safety and decreases the traffic congestion on roads. New paradigms such as Cloud computing and internet of things are aiding in achievement of the inter-communication among the vehicles on road. VANETs are designed to provide effective and efficient communication systems to develop innovative solutions but are restricted due to mobility constraints. This chapter proposes an IP-based novel framework composed of open threads integrated with VANETs exchanging information to create a mesh network among vehicles. This novel Open Threads-based infrastructure can help in achieving a more economical, efficient, safer, and sustainable world of transportation which is safer and greener. This chapter also discusses and compares various thread-enabled microcontrollers by different vendors that can be utilized to create a mesh network.

scholarly journals Multi-criteria routing metric for supporting data-differentiated service in hybrid wireless mesh networks in coal mines

2017 ◽  
Vol 13 (1) ◽  
pp. 155014771668979 ◽  
Author(s):  
Liansheng Lu ◽  
Haifeng Jiang ◽  
Guangzhi Han ◽  
Shanshan Ma ◽  
Renke Sun
Keyword(s):  
Wireless Mesh Networks ◽  
Mesh Networks ◽  
Coal Mines ◽  
Differentiated Service ◽  
Routing Metric ◽  
Hop Count ◽  
Wireless Mesh ◽  
End To End Delay ◽  
Hybrid Wireless Mesh Networks ◽  
Mesh Clients

Mesh clients in hybrid wireless mesh networks can perform the routing functionality, as well as provide end-user applications that are more suitable for tunnels, to improve the connectivity of backbone networks. In this article, based on the diversity of data and limited power supply of mesh clients in hybrid wireless mesh networks in underground mines, we propose a multi-criteria routing metric to support data-differentiated service. This routing metric divides data into two types: urgent and non-urgent. End-to-end delay is calculated when transmitting urgent data, and hop count and link load are measured when transmitting non-urgent data. In order to optimize the utilization of mesh clients and to prolong the network lifetime, mesh clients and mesh routers are given different weights in the calculation of hop count. Based on the QualNet7.1 simulation platform, the performance of the proposed routing metric in transmitting urgent and non-urgent data is evaluated through numerous simulations. Simulation results indicate that the routes selected using the proposed routing metric can effectively reduce the average end-to-end delay when transmitting urgent data and reduce the utilization rate of mesh clients while simultaneously guaranteeing the capability of the network when transmitting non-urgent data. This finding satisfies the differentiated service requirements of data of different types for hybrid wireless mesh networks in coal mines.

scholarly journals NEIGHBOURHOOD LOAD ROUTING AND MULTI-CHANNELS IN WIRELESS MESH NETWORKS

2015 ◽  
pp. 66-71
Author(s):  
NIRMALA Y. BARKER ◽  
POORNIMA. B
Keyword(s):  
Wireless Mesh Networks ◽  
Performance Metrics ◽  
Single Channel ◽  
Mesh Networks ◽  
Network Capacity ◽  
Mesh Network ◽  
Multiple Channels ◽  
Routing Metrics ◽  
Hop Count ◽  
Wireless Mesh

As an emerging technology, wireless mesh networks are making significant progress in the area of wireless networks in recent years. Routing in Wireless Mesh Network (WMN) is challenging because of the unpredictable variations of the wireless environment. Traditional mechanisms have been proved that the routing performance would get deteriorated and ideal metrics must be explored. Most wireless routing protocols that are currently available are designed to use a single channel. The available network capacity can be increased by using multiple channels, but this requires the development of new protocols specifically designed for multi-channel operation. In this paper, we propose Neighbourhood load routing metric in single channel mesh networks and also present the technique to utilize multiple channels and multiple interfaces between routers for communication. The traditional routing metrics Hop Count and Weighted Cumulative Expected Transmission Time (WCETT) are used in routing. We compare performance of AODV-HOP, WCETT and NLR routing metrics in singlechannel and multichannel environment by considering throughput and end to end delay performance metrics. Our results show that NLR performs better in singlechannel environment.

scholarly journals Bandwidth Allocation Based on Traffic Load and Interference in IEEE 802.16 Mesh Networks

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Sanjeev Jain ◽  
Vijay Shanker Tripathi ◽  
Sudarshan Tiwari
Keyword(s):  
Bandwidth Allocation ◽  
Wireless Mesh Network ◽  
Mesh Networks ◽  
Mesh Network ◽  
Traffic Load ◽  
Routing Metric ◽  
Bandwidth Utilization ◽  
Throughput Performance ◽  
Wireless Mesh ◽  
Simulation Results

This paper introduces a traffic load and interference based bandwidth allocation (TLIBA) scheme for wireless mesh network (WMN) that improves the delay and throughput performance by proper utilization of assigned bandwidth. The bandwidth is allocated based jointly on traffic load and interference. Then a suitable path is selected based upon the least routing metric (RM) value. Simulation results are presented to demonstrate the effectiveness of the proposed approach which indicates higher bandwidth utilization and throughput as compared with existing fair end-to-end bandwidth allocation (FEBA).

scholarly journals An Efficient Traffic-Load and Link-Interference Aware Routing Metric for Multi Radio Multi Channel Wireless Mesh Networks Based on Link’s Effective Capacity Estimation

2014 ◽  
Vol 7 (4) ◽  
pp. 129
Author(s):  
Maheen Islam ◽  
M. Lutfar Rahman ◽  
Mamun-Or- Rashid
Keyword(s):  
Wireless Mesh Networks ◽  
Mesh Networks ◽  
Packet Transmission ◽  
Traffic Load ◽  
Effective Capacity ◽  
Routing Metric ◽  
Maximum Throughput ◽  
Hop Count ◽  
Traffic Demand ◽  
Wireless Mesh

Routing metrics proposed for Wireless Mesh Networks (WMNs) has various concerns like hop count, packet transmission delay, power consumption, congestion control, load balance and message collision. The routing metric of expected effective capacity (EEC) proposed in this paper guarantees to a select a path providing maximum throughput and minimum delay. A forwarding link constituting routing path is characterized by its quality, capacity, traffic demand and the degree of intervention experienced due to inter-flow and intra-flow interference. Thus the bandwidth actually attainable on a link for a flow is affected by those link properties. Our proposed metric computes the attainable bandwidth for a flow over a path which actually reflects congestion, node delay and traffic pressure on the desired path. Experiments conducted on ns-2 simulations demonstrate that our proposed routing metric can achieve significant improvements in overall network throughput, minimize end-to-end delay and able to distribute network load.

scholarly journals A heuristic cross-layer mechanism for real-time traffic over IEEE 802.16 networks

2007 ◽  
Vol 17 (5) ◽  
pp. 347-361 ◽  
Author(s):  
Dionysia Triantafyllopoulou ◽  
Nikos Passas ◽  
Apostolis K. Salkintzis ◽  
Alexandros Kaloxylos
Keyword(s):  
Real Time ◽  
Ieee 802.16 ◽  
Cross Layer ◽  
Real Time Traffic
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