Modeling and performance analysis of multihop packet radio networks

Performance analysis of multi-service wireless network: An approach integrating CAC, scheduling, and buffer management

This paper extends previous research efforts related to the simulation performance modelling and analysis of satellite communication networks. Specifically, the use of low earth orbit (LEO) satellite networks for personal communications is examined. Six different satellite constellation configurations are investigated in a packet-switched operating environment. Performance metrics examined are the end-to-end packet delay and the utilization of satellite channels in the dynamic environment. Realistic and accurate models of the physical satellite network and its terrestrial transmitters require that numerous operating characteristics and assumptions be specified. These are based on proposed design requirements of commercial systems, such as Iridium. Via the use of simulation, we show the relative delay and utilization performance of differing satellite network architectures. From these simulation models, mathematical metamodels are derived for the system delays. These innovative models are used to predict the delay performance of different network architectures not previously simulated. Comparison of these metamodels with simulation results show that metamodels provide an accurate means for performance prediction. Copyright © 1999 John Wiley & Sons, Ltd.

Video modeling and performance analysis of ATM networks by Kwok-leung Chung thesis 1995 xii, 81 leaves : ill. ; 30 cm Video sources will become one of the major traffic in future ATM networks. The video sources should be transmitted…Read more ›

Performance Analysis of Wireless Adhoc Networks in Flat Fading and Frequency Selective Fading channels

We present a two-moment performance analysis of cellular mobile networks with and without channel reservation. Unlike classical analysis where handoff traffic is modeled as Poisson, we characterize handoff traffic as a general traffic process and represent it using the first two moments of its offered traffic. We empirically show that handoff traffic is a smooth process under negative exponential channel holding times. We also show how one may determine customer-oriented grade-of-service parameters such as new-call blocking, handoff call blocking, and forced termination probability under the two-moment representation of traffic offered to each cell. We present extensive results validating our analysis. We compare the performance of the proposed two-moment analysis with classical single-moment analysis and simulation results. Our simulation employs five different mobility models. We show that our proposed model outperforms the existing analytical method when compared to simulation results employing all five mobility models.

With the difference of satellite altitude, there are always some inherent defects in the traditional single-layer satellite networks. In this paper, in order to improve the performance of the single-layer networks, a multi-layer satellite network model composed of LEO/MEO/GEO and inter satellite link is proposed. In this model, the LEO and MEO layers are used as the access layer, and the data transmission is carried out to the ground. As the core layer, the GEO layer is responsible for the management of the whole network and the link assignment. Then modeling the network based on the STK satellite simulation platform and carrying out the simulation analysis of ground coverage, the performance of the inter satellite link and the link transmission. Theoretical analysis and simulation results show that the design of multi-layer satellite network is reasonable and effective, and also can be used in the construction of the integrated satellite-terrestrial networks.

The throughput and delay of the mobile-to-base channel of a packet radio network employing a nonpersistent inhibit sense multiple access (ISMA) technique are investigated using analysis and discrete event simulation. Land-mobile packet radio networks typically employ frequency modulation, which exhibits a distinct capture effect. The capture phenomenon and the distribution of received packet amplitudes caused by propagation losses and multipath effects allow a packet sent on the mobile-to-base channel to be successfully received in the presence of interfering packets. It is found that, under these conditions, the capacity of ISMA can be substantially higher than that of the same protocol without capture. Furthermore, at high channel loading, the packet delivery delay of ISMA with capture is noticeably smaller than the delay of a channel without capture. The particular distribution of received packet signal strengths is a key factor in determining the throughput characteristic with capture. Reducing the capture ratio by choice of modulation technique and error control is therefore a step that system designers can take to improve the capacity of packet radio systems. >

Purose: To analyse the quality of operation of the PRC network, enabling the evaluation of time of guaranteed delivery of data packets to the subscribers of the network in bad radio-electronic conditions. Methods: To address the problem, methods from the general theory of systems, probability theory, queuing theory, as well as the method of topological transformation of stochastic networks (TTSN) have been used. Results: The developed model allows us to estimate the quality of functioning of the packet radio communications network, which allows us to determine the main directions to improve the interference immunity of PRC networks from the effects of random and intentional interference. Practical significance: The obtained results can be used in the design of mobile radio networks of the ALE standard, as well as in the development of methods to improve the interference immunity of radio networks, multi-parameter adaptation systems.

In this chapter, the author will first introduce in Section 4.1 a brief overview of various approaches and processes for network analysis, architecture, and design. Details of the network analysis, architecture, and design processes will be sequentially presented in Sections 4.2-4.4.As a typical network-design model, the hierarchical design approach will be discussed in detail in Section 4.5 along with its layers in Section 4.6. Various network-design approaches and their evolution will be summarized in Section 4.7. Finally, Section 4.8 will provide further discussion on network management and security.

A system designed for supporting the network performance analysis and forecast effort is presented, based on the combination of offline network analysis and online real-time performance forecast. The off-line analysis will perform analysis of specific network node performance, correlation analysis of relative network nodes performance and evolutionary mathematical modeling of long-term network performance measurements. The online real-time network performance forecast will be based on one so-called hybrid prediction modeling approach for short-term network, performance prediction and trend analysis. Based on the module design, the system proposed has good intelligence, scalability and self-adaptability, which will offer highly effective network performance analysis and forecast tools for network managers, and is one ideal support platform for network performance analysis and forecast effort.

We consider a general online network design problem where a sequence of N requests arrive over time, each of which needs to use a subset of the available resources E. The cost incurred by a resource e ∊ E is some function fe of its total load ℓe. The objective is to minimize the total cost Σe∊E fe(ℓe). We focus on cost functions that exhibit (dis)economies of scale, which are of the form if x > 0 (and zero if x = 0), where the exponent αe ≥ 1.Our main result is a deterministic online algorithm with tight competitive ratio when αe is constant. This framework is applicable to many network design problems, including multicommodity routing, Steiner tree/forest connectivity and set-connectivity Even in special cases such as multicommodity routing in undirected graphs with edge-costs, this is the first online algorithm to handle non-uniform resource cost and with a competitive ratio independent of the network size and number of requests. Our online competitive ratio also matches the previous-best offline approximation ratio. Our approach is based on the online primal-dual method for convex programs.

Finite-state Markov chain (FSMC) models have often been used to characterize the wireless channel. The fitting is typically performed by partitioning the range of the received signal-to-noise ratio (SNR) into a set of intervals (states). Different partitioning criteria have been proposed in the literature, but none of them was targeted to facilitating the analysis of the packet delay and loss performance over the wireless link. In this paper, we propose a new partitioning approach that results in an FSMC model with tractable queueing performance. Our approach utilizes Jake's level-crossing analysis, the distribution of the received SNR, and the elegant analytical structure of Mitra's producer-consumer fluid queueing model. An algorithm is provided for computing the various parameters of the model, which are then used in deriving closed-form expressions for the effective bandwidth (EB) subject to packet loss and delay constraints. Resource allocation based on the EB is key to improving the perceived capacity of the wireless medium. Numerical investigations are carried out to study the interactions among various key parameters, verify the adequacy of the analysis, and study the impact of error control parameters on the allocated bandwidth for guaranteed packet loss and delay performance.

In a massive machine type communication (massive MTC) network, wireless connections between machine type devices (MTDs) and eNodeBs are unreliable due to the interference caused by uncoordinated access of other MTDs. Furthermore, it is with a high probability that the retransmission from the outage source MTD will fail again due to the spatiotemporally correlated interference. In this paper, we design and analyze a location-based cooperative strategy to improve the performance of massive MTC networks. In the cooperative strategy, an inactive MTD is selected as a relay if it has successfully decoded the packet and if it is located within a circular area around the eNodeB. Considering the spatial and temporal correlation of interference, the outage probability of the designed cooperative strategy is derived using stochastic geometry. Both the simulation and numerical results demonstrate that spatiotemporal correlation of interference significantly affects the performance analysis of cooperative massive MTC networks and our designed cooperative strategy can significantly reduce the outage probability compared to conventional retransmission.

A spread-spectrum multiple-access (SSMA) packet radio network model is presented. The topology is a fully connected network with identical message generation processes at all radios. Packet lengths are exponentially distributed, and packets are generated from a Poisson process, resulting in a Markovian model. This network model accounts for the availability of idle receivers in a finite population network. The model also allows the performance of the radio channel to be specified in detail. The channel considered is a BPSK (binary phase-shift keying) direct-sequence SSMA radio channel with hard-decision Viterbi decoding. An analysis of the Viterbi decoder leads to a bound on its performance which is valid for a system with a varying probability of error, as is the case for the network under consideration. The approximate analysis yields lower bounds on throughput and probability of successful packet transmission. Results are given which show the effects on throughput of the received energy-to-noise density ratio, the number of chips per symbol, and the number of radios, as well as the improvement due to error control coding.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

We propose a novel transmission scheme suitable for short packet transmission over wireless channels. The proposed scheme is characterized by two schemes: 1) multicopy transmission per transmission payload and 2) multiple fragmented packet (referred to as minipacket) transmission. The multicopy transmission is to mitigate the transmission inefficiency of short packets and improve the decoding probability at the receiver. On the other hand, the minipacket transmission is to avoid the retransmission of correctly received symbols. By implementing the proposed scheme into the traditional IEEE 802.11b WLAN system, simulation results show the improved system throughput and reduced packet transmission time.