Dimensioning of signaling capacity on a cell basis in GSM/GPRS (original) (raw)

Dimensioning Rules Regarding Radio Resources in GSM/GPRS Networks

2009

Many works have studied traffic modeling in GSM/GPRS networks trying to establish different performance parameters needed for dimensioning purposes. An important element of these networks is the radio resources. Sharing resources between different users and different services is a key concept of radio resources dimensioning in GSM/GPRS networks. In this paper we focus on the problem of performance evaluation in GSM/GPRS networks. We consider different resources allocation strategies such as: CP (Complete Partitioning) and PP (Partial Partitioning) and we study the influence of different operational details concerning TS (time-slots) assignment: FR (full rate), HR (half rate) and packing. Finally, we establish dimensioning rules based on traffic evaluation and quality of service level for GSM/GPRS users. For voice users the quality of service is given by the blocking probability calculated according to the proposed packing rule and for GPRS users the individual throughput and the blocking probability represent the performance parameters. We consider also the preemption probability of voice over data users.

Traffic Models and Associated Parameters in GSM/(E)GPRS Networks

2009

GSM/(E)GPRS networks support a mixture of traffic consisting of voice and data. A key concept of dimensioning radio resources in such networks is represented by sharing resources between different users and different services. In this paper we address the problem of voice and data traffic models according to different resources allocations strategies: CP (Complete Partitioning) and PP( Partial Partitioning) and define specific parameters in each case. The proposed traffic model depend in each case on the resources allocation strategy: for voice traffic it is based on both cases, CP and PP, on Erlang law meanwhile for data traffic we build different models depending the scheme used for resources allocation. For CP scheme we propose two models: the model based on Erlang law and those based on modified Engset law. For PP scheme we also proposed two models: one is based on the bi-dimensional Markov chain and the other on the modified Engset law. Both consider voice-data interaction according to the PP scheme. In all cases we define specific performance parameters. We also implement the studied models and evaluate the proposed performance parameters. Finally we compare the results in order to find the adequate model to use for dimensioning purposes.

Analysis of a traffic model for GSM/GPRS

2001

A traffic model for GSM/GPRS, the hybrid radio resource allocation (HRRA) algorithm is evaluated. A dedicated number of GPRS channels plus idle periods between voice calls are used for GPRS data packet transfers. A simulator was developed in order to evaluate the HRRA algorithm, which provides a reasonable forecast on the voice blocking probability and on packet delay for a single cell system. Since the major issue is the correct resource allocation, results are shown for the influence of some choices and assumptions on the overall system performance.

TRAFFIC DIMENSIONING MODEL AND PERFORMANCE EVALUATION IN GSM/GPRS NETWORK. …………………………………………………………………………………………………….... Introduction

The way and manner limited resources (timeslots) of a GSM/GPRS network is shared between GSM services and GPRS services is key to maximization of revenue for the telecommunications companies as the revenue is directly proportional to how much users the system can attend to per time. Consequently, the aim of this work is to determine the best sharing scheme that will allow for the maximum utilization of the available timeslots by having more users of both traffic classes being served per time. The markov chain model was used to model the blocking probability of the circuit switched services while the markov modified engset model was used to model the probability of the packet switched services. These two models were now applied to three dimensioning (sharing) schemes that were considered in this work. These models were then implemented as M-codes on MATLAB and the plotted results were compared to arrive at the final conclusion of this work. The partial partitioning scheme were found to have lower data blocking probabilities and higher data throughput (of between 50% to 300% depending on the voice traffic load per time) for same number of users than its complete partitioning dimension scheme counterpart. The model was also validated with real network data and the result was consistent with the model. It was eventually concluded that of the complete sharing, complete partitioning and the partial partitioning schemes considered in this work, the partition partitioning scheme is the most efficient in timeslot allocation and usage and hence better revenue generation in the overall system as it can attend to more GSM and GPRS users simultaneously at a time.

A bandwidth-on-demand strategy for GPRS

IEEE Transactions on Wireless Communications, 2005

General packet radio service (GPRS) is a global system for mobile communications (GSM) packet data service. In order to efficiently accommodate GPRS traffic while maintaining the desired service quality of GSM calls, we propose a GPRS bandwidth-allocation strategy called the bandwidth-on-demand (BoD) strategy. The BoD strategy is adaptive to the change of traffic conditions, and thus can dynamically adjust the number of channels for GSM and GPRS traffic. Taking the effect of packet dropping due to movements of mobile stations into account, this paper develops an analytical model to study the BoD performance in terms of GSM-call-blocking probability and GPRSpacket-dropping probability. Index Terms-Bandwidth-on-demand (BoD), general packet radio service (GPRS), global system for mobile communications (GSM).

Performance Analysis of GSM-GPRS Network

Anais do 2002 International Telecommunications Symposium

To provide Internet Services with much better utilization of frequency spectrum the General Packet Radio Service (GPRS) is integrated in a GSM network. However, some questions to arise about the network performance when these networks are integrated, once that they share the same radio resource of the air interface. Hence, on this article an analytic model is developed using the M/M/c/c queue, which is used to analyze the integrated GSM-GPRS network. That model is based on the voice services pre-emption over the Internet services to provide measures that inform the availability of radio resource, and this way, the throughput of the GPRS to any offered voice traffic profile on the GSM network.

Design and performance modeling of resource allocation strategies for GPRS

Journal of the Chinese Institute of Engineers

Incorporating promising techniques, including buffering, priority, de-allocation, preemption, and threshold control on the buffer into the resource allocation design for the general packet radio service (GPRS) network, four resource allocation strategies are proposed in this paper, i.e., strategies RAS 1 , RAS 2 , RAS th1 , and RAS th2. For the four strategies, analytic models are built to obtain performance measures expressed in general forms using the Markov chain approach. In addition, simulation experiments are arranged and used to validate the analytic results. Based on the numerical results, we show that i) a good match between analytic and simulation results strongly supports the theoretical analysis given in this paper; ii) these four strategies, designed in a comprehensive manner, can outperform many strategies previously proposed in the literature; iii) better voice call performance and superior quality of service (QoS) differentiation between new and handoff voice calls can be achieved by using these strategies.

Quantifying GoS and QoS in CDMA cellular networks

Elixir Network Engg. 34 (2011) 2630-2635, 2011

To satisfy the ever increasing network capacity, cellular systems should operate effectively with good grade of service (GoS) and quality of service (QoS). This paper proposes a quantitative approach to measuring the GoS and QoS performance of CDMA systems. It studies a realistic CDMA system operating in Nigeria and obtains empirical data from the field. A multi-dimensional Markov chain model is derived using related parameters and simulated under ideal conditions. The performance metrics of interest include blocking probability, handoff failure probability and weighted cost for GoS, and loss of communication quality for QoS. Simulation results show that effective link adaptation policies can greatly improve the system’s performance

Optimizing the Use of Random Access Channels in GSM-GPRS

2002

The random access channels and traffic channels are utilized, respectively, for call establishment and information transmission in the uplink direction (from mobile to base station) of the Global System for Mobile communications (GSM) networks. A call is either rejected or blocked depending on its inability to succeed either in the random access channels or in the traffic channels. The optimum number of random access slots is directly proportional to the average call arrival rate, being independent of the average channel holding time and the number of traffic channels. The number of slots occupied by a given call can be changed dynamically in the newly developed General Packet Radio Service (GPRS) systems. A complete analysis is executed for the traffic channel utilization and call blocking probability with the exact number of random access slots that provide almost zero call rejection probability. The overall call success probability is derived considering call rejection and call blocking probabilities.