Home // International Journal On Advances in Telecommunications, volume 4, numbers 1 and 2, 2011 // View article

Performance Model for Orthogonal Sub Channel in Noise-limited Environment

Authors:
Jyrki T.J. Penttinen
Francesco D. Calabrese
David Valerdi
Iñigo Güemes

Keywords: OSC, GSM, 2G, SAIC, voice evolution, capacity enhancement, radio network planning, optimization, DHR.

Abstract:
OSC (Orthogonal Sub Channel) is an enhancement for the GSM voice service. It provides up to double capacity in the radio interface with the same hardware compared to the GSM Half Rate (HR) mode. This paper investigates the effects of OSC on the capacity utilization as a function of the OSC capable handset penetration. The variation of the radio network capacity is studied by taking into account the division of the time slot usage between HR and OSC capable terminals, which depends on the OSC capable handset penetration. The achievable capacity gain is studied by investigating the blocking rate behavior. In addition, a set of test cases was carried out in a GSM network in order to evaluate the radio performance of OSC in terms of the carrier per noise level. The tests were performed in a noise-limited indoor environment, and the quality and received power level distributions were analyzed. Based on the post-processing and analysis of the performance data as a function of the OSC penetration, a generic model to estimate the effect of OSC on the GSM capacity gain was developed. The model utilizes the network statistics and performance indicators of GSM, and provides an estimate of the possible OSC gains in the investigated regions before the OSC feature is actually activated.

Pages: 112 to 126

Copyright: Copyright (c) to authors, 2011. Used with permission.

Publication date: September 15, 2011

Published in: journal

ISSN: 1942-2601