5 results
Now showing1 - 5 of 5
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , UMTS HSPA and R99 traffic separationThis paper presents a general traffic separation approach to transmit HSPA traffic in the existing ATM-based UMTS network, together with Release 99 (R99) traffic. The traffic separation technique enables QoS differentiations of HSPA and R99 traffic, while at the same time aims to achieve a maximum utilization of the transport resources in the radio access network. The potential benefit of applying traffic separation and its impact on the performance of the transport network as well as the end users are explored in this paper. The quantitative evaluations are provided by means of simulations. The results presented are obtained from a UMTS simulation model developed in this work which transmits both HSPA and R99 traffic, either with traffic separation enabled or disabled. © 2008 International Federation for Information Processing.Publicationtype: Conference Paper48 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Impacts of air interface call admission control on UTRAN transport simulationsThis paper investigates the potential impacts caused by Call Admission Control (CAC) mechanism of the air interface on simulations carried out for the transport network domain of UMTS Radio Access Network. Independent from the TNL CAC mechanism of the transport network which is in charge of Iub link bandwidth, the Radio CAC function deals with the highly non-linear resources needed for an attempted connection depending on its specific propagation and interference situation. The consideration of the air interface acting as bottleneck results into a less challenging amount of traffic for the transport domain. In this work, a simulation model with Radio CAC mechanism is implemented to study this correlation, and evaluate the UTRAN transport network performance given a limited radio capacity. The analysis on the impact of the Radio CAC is derived from qualitative simulations.Publicationtype: Conference Paper41 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Carrier ethernet for transport in UMTS radio access network: Ethernet backhaul evolutionThis paper discusses the use of Carrier Ethernet for the transport of UMTS radio access network as a alternative solution for the gradual migration towards pure IP-based RAN. By means of Pseudo-Wire technique, the ATM service is emulated over the underlying Ethernet network. Within this work, the performance of such Carrier Ethernet based UTRAN is evaluated and compared to the ATM-based UTRAN of UMTS Release 99, in particular the transport efficiency, the delay and packet losses of the Iub. Another contribution of this paper is to investigate the parameter settings to provide a guideline for the optimum configurations.Publicationtype: Conference Paper48 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Optimization of bit rate adaptation in UMTS radio access networkIn order to improve the effective utilization of the radio resources, Bit Rate Adaptation (BRA) is applied in the UMTS system, specifically for the best effort and interactive packet traffic. This paper presents investigation results on the optimization of Bit Rate Adaptation (BRA) scheme for an efficient data support in the UMTS radio access network.Publicationtype: Conference Paper44 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Dimensioning of UTRAN iub links for elastic internet traffic with multiple radio bearersIn the growing 3G Universal Mobile Telecommunications System (UMTS) mobile network systems, in order to support a great variety of service characteristics efficiently, a number of different types of Radio Access Bearers (RAB) are provided to carry the packet switched (IP) traffic. Each radio bearer provides a certain peak data rate to transfer user data between UE (User Equipment) and CN (Core Network) for a certain traffic class. The selection of an appropriate bearer depends on the user subscription, service type, requested Quality of Service (QoS), radio characteristics etc. In this paper, the simulation results of transferring packet switched services with multiple RABs each supporting certain QoS are presented. The analytical approach to evaluate the application performance of a single RAB is then extended to support multiple RABs. Additionally, a more precise solution for analytically calculating the average response time for different file size distributions is described. With the help of these improvements the necessary bandwidth on the Iub interface can be determined.Publicationtype: Conference Paper29