Capacity Gain Estimation for Orthogonal Sub Channel

Abstract

OSC (Orthogonal Sub Channel) is an enhancement for the GSM voice traffic. It provides up to double capacity in the GSM radio interface with the same hardware compared to the previous GSM Half Rate (HR) mode. This paper investigates the effects of the OSC on the capacity utilization compared to the GSM HR as 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. The results show the achievable capacity gains in terms of reduced time slots and transceiver units with given blocking rate.

Prediction model for the GSM Dual Half Rate gain in a noise-limited environment based on field measurements and simulations

“…This is due to the fact that the (Q, P RX ) matrix changes based on the timeslot utilization for the GSM users and for the paired OSC connections as has been concluded in [8] and [9].…”

“…This paper enhances the model for the OSC capacity gain presented in [8] and [9]. The proposed model is based on the Key Performance Indicators (KPI) of the GSM network generated by the Full and Half Rate Codec users.…”

“…The model presented in [8] and [9] describes the construction of the predicted (Q, P RX ) matrix as a function of the SAIC penetration. That method assumes that the respective difference matrix can be applied by summing individually the (Q, P RX ) matrix elements that are presented in absolute values.…”

“…A prediction model for the OSC performance and capacity estimation is presented in [8] and [9] for estimating the OSC gain. The model is based on the analysis of the DHR utilization as a function of a quality category (Q), and is valid for a noise-limited, single cell case in indoors where the user distribution is uniform over the received power levels.…”

“…For the scaling, the relationship between the SAIC penetration Į with {Į∈ |0≤Į≤1} and the actual usage of the physical timeslots ȕ with {ȕ∈ |0≤ȕ≤1} of the GSM transceiver units is obtained by (3) derived in [9]:…”