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The proliferation of internet-connected mobile devices will continue to drive growth in data traffic in an exponential fashion, forcing network operators to dramatically increase the capacity of their networks. To do this cost-effectively, a paradigm shift in cellular network infrastructure deployment is occurring away from traditional (expensive) high-power tower-mounted base stations and towards...
Multi Radio Multi Channel Wireless Mesh Networks (MRMC-WMNs) are undergoing rapid progress and inspiring numerous deployments. These networks require carefully assignment of resources and load balancing to provide the quality guarantees to traffic flows. Load balancing avoids the creation of bottlenecks and increases the network efficiency. Certainly, we need a benchmark to compare the performance...
At present, although the IEEE 802.11 MAC and PHY specifications provide multi-channel and multi-rate capabilities, exploiting data rates and available orthogonal channels is still a crucial issue to ensure high network performance in wireless mesh networks (WMNs). Most channel assignment schemes for WMNs assume that all links operate at an identical data rate; i.e., they ignore the existence of multi-rate...
EDCA is a contention-based channel access scheme defined in the IEEE 802.11e standard and it can ensure quality of multimedia services. In this paper, we propose a new enhanced EDCA scheme called Hybrid-Measure EDCA(HM-EDCA), which dynamically adjust the important parameters-contention window(CW) size according to both of network condition and traffic state of traffic categories at each node. Network...
High packet network have become an essential in modern multimedia communication. Shared buffer is commonly used to utilize the buffer in the switch. In this paper, we analyse the performance of shared buffer with different memory sizes. The architecture of the multi-class shared buffer is developed for 16×16 ports switch that is targeted in Xilinx FPGA. The performance of the multi-class shared buffer...
Microsoft's Receive-side scaling (RSS) is a network driver layer technology that enables the efficient distribution of received packets. However, Microsoft's RSS technology is implemented in hardware. In this paper, we implement RSS technology in user-space and apply it in a traffic monitoring system which runs on the DELL R710 multi-core server. We distribute received packets, according to certain...
In this paper, we present an Multi-Dimensional Learning multiple access control scheme for cognitive radio users in unlicensed spectrum. The proposed scheme is developed by applying reinforcement learning to the perspectives of both channel assignment and retransmission policy based upon a multichannel p-persistent CSMA algorithm. In a distributed open spectrum sharing situation, decisions regarding...
In this paper, simulations of downlink Long Term Evolution (LTE) system network capacities were performed. The existing WCDMA network is used as reference for LTE radio network design: locations, antenna directions / types / tilts / heights. Simulation is performed for uniform and non-uniform network traffic distribution as well as for case with inter-cell interference coordination.
The properties of underwater acoustic channel are quite different from those of terrestrial wireless sensor networks, which brings many challenges to design an efficient media access control (MAC) protocol for underwater acoustic sensor networks (UWASNs). In order to overcome the long propagation delay and the funneling effect of UWASNs, a MAC protocol, named path-oriented code assignment (POCA) CDMA...
A Module Matched First Dispatching (MMFD) algorithm for MSM Clos-network switches is proposed in this paper. Each output port of input modules and central modules has its own state pointer. At the beginning of each time slot, schedulers configure the state of each central module according to the value of each pointer. And then, cells switched in next time slot are selected on the basis of the configuration...
Carrier Aggregation (CA) is one of the important technologies to further improve the capacity of Long Term Evolution Advanced (LTE-A). When CA is conducted, a User Equipment (UE) will firstly select a Primary Serving Cell (PCell) for mobility support and then add Secondary Serving Cells (SCell) for higher experienced data rate. When and how to add/remove SCell is a very important issue, especially...
We describe here a new burst scheduling algorithm to avoid burst overlapping in the egress router of optical burst switching (OBS) network, and hence to improve the quality of service (QoS) in developing several optical networks to fulfill the increasing demand of Internet facilities. We consider TAG (tell-and-go) protocol where many lightpaths pass in a given link and burst overlap may occur. In...
Qos provision is considered as the complex task due to the heterogeneous nature, diverse QoS requirements of emergent different applications. With the advent of high bandwidth 3G/4G technologies, like LTE, LTE-advanced, the necessity of QoS provision becomes even crucial. Uplink scheduling with QoS provision is considered here. The contribution of this work is uplink packet scheduling scheme maintaining...
In order to reduce the reception completion time of data units in the application layer, a novel TCP-oriented multi-layer packet scheduler (TCP-oriented MLPS) is proposed in this paper. The proposed scheduler firstly narrows down the number of candidate users of the packet scheduler based on the congestion window in the TCP layer, and then allocates resources to the selected candidate users preferentially...
A framework for the joint design of wireless network and controllers is proposed. Multiple control systems are considered where the sensor measurements are transmitted to the controller over the IEEE 802.15.4 protocol. The essential issues of wireless networked control systems (NCSs) are investigated to provide an abstraction of the wireless network for a co-design approach. We first present an analytical...
The rationale of this work is that the incumbent primary user (PU) of a cognitive radio (CR) system relays its traffic through the secondary user (SU) network for an enhanced throughput. In return, it rewards the SUs with an incentive time during which they can use the complete licensed bandwidth to transmit their own data, without the need for spectrum sensing. With the objective of maximizing the...
A critical shortage of spectrum resources and the underutilization of the licensed spectrum urge people to discover new approaches to efficiently utilize the spectrum resources. Opportunistic spectrum access (OSA) has been considered to be a good approach to exploit spectral resources and improve licensed spectral utilization. In this paper, based on this idea, we model and analyze one type of network...
In this paper, in a laboratory environment, the performance of four network traffic generators (Iperf, Netperf, D-ITG and IP Traffic) are compared. Two computers with Windows operating systems were connected via a 100 Mbps link and for various payload sizes, ranging from 128 Bytes to 1408 Bytes, the TCP traffic on the link was measured using the various monitoring tools mentioned above. The results...
There is the problem of absolute discrimination in current Active Queue Management (AQM) algorithms for Differentiated Services, the throughput and link utilization of network are decreased. In this paper we have presented an AQM algorithm, called Weighted-queue-length RIO-C (WRIO). WRIO realizes relative discrimination of different drop precedence, and improves link utilization, especially for the...
In this paper, a semi-Markov model is established to characterize the throughput performance of CSMA networks. Based on the assumption of Poisson distributed aggregate traffic, the throughput expression of p-persistent CSMA is derived, which includes the results of 1-persistent CSMA and non-persistent CSMA presented in Kleinrock and Tobagis landmark paper as two special cases. The analysis further...
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