Modeling and simulation of integrated voice/data cellular communication with generally distributed delay for end voice calls (original) (raw)
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International Journal of Smart Sensor and Adhoc Network., 2012
Queuing theory and Markov chain analysis plays vital role in analyzing real-life problems. It is applied to wired network, wireless network and mobile communication to analyze the packet traffic in packet switched network. In this simulation and analysis, integrated communication system such as voice and data is simulated with different queue size for voice calls with different arrival and service rate and its results are analyzed to study the impact of buffering of voice and data calls for the proposed integrated wired network using Queuing theory and Markov chain analysis. We also propose to optimize the system characteristics in an attempt to provide better Quality of Service (QoS) for systems with integrated voice and data calls. The proposed models have two traffic flow namely voice calls (real-time traffic like audio) and data calls (data traffic like FTP). A single channel is assigned for voice and data calls. The incoming voice and data calls are queued when the channel is b...
IEEE Transactions on Vehicular Technology, 2006
Resource allocation and call admission control (CAC) are key management functions in future cellular networks, in order to provide multimedia applications to mobiles users with quality of service (QoS) guarantees and efficient resource utilization. In this paper, we propose and analyze a priority based resource sharing scheme for voice/data integrated cellular networks. The unique features of the proposed scheme are that 1) the maximum resource utilization can be achieved, since all the leftover capacity after serving the high priority voice traffic can be utilized by the data traffic; 2) a Markovian model for the proposed scheme is established, which takes account of the complex interaction of voice and data traffic sharing the total resources; 3) optimal CAC parameters for both voice and data calls are determined, from the perspective of minimizing resource requirement and maximizing new call admission rate, respectively; 4) load adaption and bandwidth allocation adjustment policies are proposed for adaptive CAC to cope with traffic load variations in a wireless mobile environment. Numerical results demonstrate that the proposed CAC scheme is able to simultaneously provide satisfactory QoS to both voice and data users and maintain a relatively high resource utilization in a dynamic traffic load environment. The recent measurement-based modeling shows that the Internet data file size follows a lognormal distribution, instead of the exponential distribution used in our analysis. We use computer simulations to demonstrate that the impact of the lognormal distribution can be compensated for by conservatively applying the Markovian analysis results.
IEEE Transactions on Communications, 2004
This paper proposes a call admission control (CAC) policy for a cellular system supporting voice and data services, and providing a higher priority to handoff calls than to new calls. A procedure for searching the optimal admission region is given. The traffic flow is characterized by a three-dimensional (3-D) birthdeath model, which captures the complex interaction between the on/off voice and best-effort data traffic sharing the total resources without partition. To reduce complexity, the 3-D model is simplified to an exact (approximate) 2-D model for voice (data). The mathematical expressions are then derived for the performance measures and for the minimal amount of resources required for quality-of-service (QoS) provisioning. Numerical results demonstrate that: 1) the proposed CAC policy performs well in terms of QoS satisfaction and resource utilization; 2) the approximate 2-D model for data traffic can achieve a high accuracy in the traffic flow characterization; and 3) the admission regions obtained by the proposed search method agree very well with those obtained by numerically solving the mathematical equations. Furthermore, computer simulation results demonstrate that the impact of lognormal distributed data file size is not significant, and may be compensated by conservatively applying the Markovian analysis results.
Simulation Modeling of Call Flow Process Delays in a Cellular Network
This paper discusses on the use of discrete simulation model to design and analyze the cellular network. The conceptual network model was developed to understand the call flow processes using simulation software Arena 9.0. The model was analyzed for major bottleneck processes under various scenarios including Normal Traffic Intensity, Worst Day traffic intensity and Ideal Day Traffic Intensity. The various performance parameters of cellular services which are measured includes: Value Added Time (VAT) in the system, Non Value Added Time (NVAT) in the system, Number of Calls Request denied, Number of Calls Dropped and Call Duration. The work includes the adaptation of the simulation model using arena to analyze cellular networks. The performance analysis reveals a large percentage of the time in the Call set up processes is spent on Non Value Added Activities. Recommendations for improvements in the Call set up processes have been proposed for future consideration along with action points for improving operational efficiency.
Impacts of Buffering of Voice Calls in Integrated Voice and Data Services
2011
In this study, we aim to analyse the relationship between various characteristics of a communication system with data and voice call requests. Queuing theory and Markov chain analysis are effectively used for this purpose. Such a study is useful for understanding how the proposed mathematical models behave which represents a system with integrated voice and data calls in homogenous wireless networks. We also propose to optimise the system characteristics in an attempt to provide better Quality of Service (QoS) for systems with integrated voice and data calls. The proposed models have two dimensions; one for voice calls and one for data calls. A channel is assigned for two input traffic call, namely, voice and data calls. The incoming voice and data calls are queued when the channel is busy. Since voice calls are delay-sensitive, priority is given to voice calls. Also, since there is only one channel, data calls are only serviced if there are no voice calls in the system. For such systems, it is important to analyse the impact of buffering the voice calls as well as data calls for various mean rates of call requests, and mean service times. The analytical models presented are generic which is applicable for various systems with similar characteristics. Numerical results are also provided. The results show that the proposed models can be used for optimisation of the performance of a given network.
A unified approach to analyzing models of cellular communication networks with data call buffering
Automation and Remote Control, 2014
A unified approach to the analysis of models of cellular communication networks with queues of data calls was developed. Consideration was given to the models with two types of strategies for admission to the cell channels and the buffer. In one strategy, admission to the voice call channels is based on reservation of channels for handover of calls of the given type, and in the other strategy, on the scheme of truncating the calls of the given type. In both models, the strategy of buffer admission by the data calls relies on the scheme of place reservation for handover of the calls of the given type. The models with finite and infinite data call queues were studied. For different admission strategies, algorithms to calculate the servicing performance indices were given, and the results of their comparative analysis were presented.
IJRCAR, 2014
Call admission control is a key element in the provision of guaranteed quality of service in wireless networks. In this paper, we proposed a call admission control (CAC) scheme that deals with two types of traffic classes: voice and data respectively. These traffic classes are further divided into new/handoff voice calls and data calls. A call admission control scheme for wireless mobile communication networks is presented that works on threshold based guard channel technique. The proposed scheme assumes two different threshold values one for data calls and another one for new voice calls with a finite capacity buffer used to store data calls when the number of busy channels reaches at a certain threshold for data calls and block new voice calls when the number of busy channels reaches at another threshold for new voice calls, the rest of the channels will be available for handoff calls only. Pre-emptive technique is used to admit handoff calls when free channels are not available. This technique will significantly decrease the handoff call blocking probability. We propose an analytical model to calculate the key performance measures, and thoroughly investigate the system performance under a variety of system parameters
Performance analysis for voice/data integration on a finite-buffer mobile system
IEEE Transactions on Vehicular Technology, 2000
Personal communication service (PCS) networks offer mobile users diverse telecommunication applications, such as voice, data, and image, with different bandwidth and quality-of-service (QoS) requirements. This paper proposes an analytical model to investigate the performance of an integrated voice/data mobile network with finite data buffer in terms of voice-call blocking probability, data loss probability, and mean data delay. The model is based on the movable-boundary scheme that dynamically adjusts the number of channels for voice and data traffic. With the movable-boundary scheme, the bandwidth can be utilized efficiently while satisfying the QoS requirements for voice and data traffic. Using our model, the impact of hot-spot traffic in the heterogeneous PCS networks, in which the parameters (e.g., number of channels, voice, and data arrival rates) of cells can be varied, can be effectively analyzed. In addition, an iterative algorithm based on our model is proposed to determine the handoff traffic, which computes the system performance in polynomial-bounded time. The analytical model is validated by simulation. He is an Associate Editor of the IEEE TRANSACTIONS ON MULTIMEDIA. His research interests include internet computing, real-time operating systems, real-time networking, real-time multimedia applications, e.g., video conference and video on demand, computational geometry, combinatorial optimization, VLSI design algorithms, and implementation and testing of VLSI algorithms on real designs. He and his team members have developed several system prototypes including a multimedia digital library, ASIS MDL.
Computer Networks, 2006
In this paper, we propose and analyze a service-dependent handoff and channel allocation scheme in voice and data integrated cellular mobile systems, which combines the ideas of ''Variable Bandwidth'' and ''Preemptive Priority'' together. In the scheme, voice and data traffic are considered. According to the variations of the offered traffic intensity at each cell, both a voice and a data call in service can occupy a full-rate channel or a half-rate channel. In order to guarantee the Quality of Service (QoS) for both voice and data traffic, channel resources are fairly shared between voice and data calls according to an optimal channel allocation scheme, which minimizes the difference between the average bandwidth of a voice call in service and that of a data call in service. To minimize the forced termination of a voice call, a voice call can preempt a data call in service if all the calls in the channel pool of the current cell are already assigned with half-rate service. The interrupted data call returns back to the queue specially prepared for data traffic. By analysis, we obtain the most important system performance measures. Comparisons with the scheme, which only supports ''Preemptive Priority'' without ''Variable Bandwidth'' supporting, shows that if the total arrival rate for originating calls is not very heavy, the new scheme can provide lower blocking probability and forced termination probability for both voice and data traffic, and shorter average total transmission time for a successfully completed data call.
Performance Analysis of Integrated Call Admission Control and Scheduling in Mobile Cellular Networks
2006
In this paper we consider the problem of Radio Resource Management (RRM) in mobile cellular networks offering not only real time services (voice services), but also data services. In particular, we investigate integrated Call Admission Control (CAC) and Scheduling policies that can provide a good tradeoff between the QoS of voice and data services, considering two alternatives, and developing analytical techniques for the assessment of their performance metrics. In all schemes the admission criteria is based on network load (channels and buffer occupancies); and the CAC also performs service classes differentiation reserving some radio channels in order to favor handoff and data packet traffics over new call connection requests. The scheduling policies are FIFO and Priority Queueing (PQ). Analysis of these schemes are outline and the results show that: PQ may be perfectly employed when it is needed to employ service classes differentiation between the non-real time traffics; and that FIFO achieves acceptable results when all data packet traffic have to be queued in only one buffer. The results also show that the use of the reserved radio channels to carry out the data packet traffic can enhance the QoS perceived by the lower priority data packet traffic.