|Title: Investigating the Impacts of IP Transport Impairments on Data Services in LTE Networks 1stEuropean Teletraffic Seminar (ETS)|
|Written by: Ming Li and Umar Toseef and Xi Li and Andras Balazs and Andreas Timm-Giel and Carmelita Goerg|
|in: The First European Teletraffic Seminar may 2011|
|Address: Pozna?, Poland|
Abstract: Mobile network operators (MNOs) need agreements with ISPs (IP Service Providers) on the quality of IP transport networks for LTE. Owning to the fact that requirements on QoS parameters drives the bandwidth leas-ing costs, MNOs have great interest in defining minimum requirements of transport network QoS parameters which can still meet target QoE of the end users. This work is focused on defining such QoS parameter require-ments for VoIP applications based on narrowband and wideband codec. Through an intensive set of simulations we investigate the impact on VoIP call quality caused by transport network impairments. VoIP call quality is evaluated by implementing procedures recommended by ITU-T standards into LTE system level simulator de-veloped in OPNET. We find that user QoE of VoIP is more sensitive to packet loss than to packet delay impair-ments for the investigated IP network profiles. Moreover user QoE can be enhanced using wideband codec. Fur-ther investigations are encouraged to include more wideband codec and study of handover procedures in greater detail.