A call quality performance measure for handoff algorithms

This paper proposes a new approach for performance evaluation and comparison between existing handoff algorithms taking into consideration signal levels, call dropping, and handoff cost. Using the new approach, existing handoff algorithms are then compared in terms of signal quality and number of handoffs required to achieve a desired overall signal quality. We also provide in this paper a method to estimate handoff cost and to optimize handoff sequences for retrial (where repeated call attempts are made after a call is lost) and non-retrial models based on the proposed approach. We observe that the Threshold with Hysteresis method performs better than other known methods including the one used in the GSM standard. Our results indicate that the Threshold with 4 dB Hysteresis method performs well for urban areas although with a high dropping probability, whereas the Threshold with 6 dB Hysteresis method suits for suburban areas with a low dropping probability. We find that handoff sequences obtained by existing handoff methods are less efficient than the optimal handoff sequence given in the paper by a margin of 29–45% for retrial model, and by 34–77% for non-retrial model. The paper also suggests some specific parameter values to improve the performance of currently used handoff methods based on our findings. Copyright © 2010 John Wiley & Sons, Ltd. (In this paper, we have proposed a new measure for performance evaluation and comparison between existing handoff algorithms, taking into consideration signal level, call dropping and handoff cost for cellular networks, for both the retrial (where repeated call attempts are made) and the non-retrial call options. Using the new approach, existing handoff algorithms are then compared in terms of signal quality and number of handoffs required to achieve a desired overall signal quality. We have found that the existing handoff methods are less efficient than the optimal handoff sequence for retrial model by 29–45% and for non-retrial model by 34–77%.)

[1]  B. Singh Hard Handover Performance Evaluation through Link Drops , 2007, 2007 International Conference on Signal Processing, Communications and Networking.

[2]  V. Tabataba Vakili,et al.  New handoff initiation algorithm (optimum combination of hysteresis & threshold based methods) , 2000, Vehicular Technology Conference Fall 2000. IEEE VTS Fall VTC2000. 52nd Vehicular Technology Conference (Cat. No.00CH37152).

[3]  Kishor S. Trivedi,et al.  Combined Guard Channel and Mobile-Assisted Handoff for Cellular Networks , 2008, IEEE Transactions on Vehicular Technology.

[4]  Ning Zhang,et al.  Analysis of handoff algorithms using both absolute and relative measurements , 1994, Proceedings of IEEE Vehicular Technology Conference (VTC).

[5]  Stephen S. Rappaport,et al.  Personal Communication Systems Using Multiple Hierarchical Cellular Overlays , 1995, IEEE J. Sel. Areas Commun..

[6]  Jiannong Cao,et al.  Joint Optimization of Spectrum Handoff Scheduling and Routing in Multi-hop Multi-radio Cognitive Networks , 2009, 2009 29th IEEE International Conference on Distributed Computing Systems.

[7]  Hazem Tawfik,et al.  Pattern recognition techniques in handoff and service area determination , 1994, Proceedings of IEEE Vehicular Technology Conference (VTC).

[8]  Brian L. Mark,et al.  Analysis of Handoff Interference and Outage along Arbitrary Trajectories in Cellular Networks , 2008, IEEE Transactions on Wireless Communications.

[9]  Ainslie,et al.  CORRELATION MODEL FOR SHADOW FADING IN MOBILE RADIO SYSTEMS , 2004 .

[10]  S. Nanda,et al.  Teletraffic models for urban and suburban microcells: cell sizes and handoff rates , 1993 .

[11]  Hazem Tawfik,et al.  Handoff algorithms based on fuzzy classifiers , 2000, IEEE Trans. Veh. Technol..

[12]  Marco Ajmone Marsan,et al.  Efficient estimation of call blocking probabilities in cellular mobile telephony networks with customer retrials , 2001, IEEE J. Sel. Areas Commun..

[13]  Hai Le Vu,et al.  Signal-based evaluation of handoff algorithms , 2005, IEEE Communications Letters.

[14]  Venugopal V. Veeravalli,et al.  A locally optimal handoff algorithm for cellular communications , 1997 .

[15]  S. Chakrabarti,et al.  On threshold setting and hysteresis issues of handoff algorithms , 1999, 1999 IEEE International Conference on Personal Wireless Communications (Cat. No.99TH8366).

[16]  J. M. Holtzman,et al.  A model for analyzing handoff algorithms (cellular radio) , 1993 .

[17]  Fambirai Takawira,et al.  Nonclassical traffic modeling and performance analysis of cellular mobile networks with and without channel reservation , 2000, IEEE Trans. Veh. Technol..

[18]  K.D. Wong,et al.  A pattern recognition system for handoff algorithms , 2000, IEEE Journal on Selected Areas in Communications.