Performance of a TD-SCDMA cellular system in the presence of circuit and packet switched services

Conference Paper · June 2004with5 Reads
DOI: 10.1109/VETECS.2004.1390638 · Source: IEEE Xplore
Conference: Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th, Volume: 4
We analyze the performance of a time-division synchronous code-division multiple access (TD-SCDMA) system. In particular, we investigate the impact of packet switched applications (for instance Web browsing sessions) on the overall performance of the network. Here, we quantify the degradation of the voice users' quality in the presence of packet data services and vice versa. Finally, we investigate the impact of some power control parameters on the overall quality and we show that these parameters should be carefully chosen to balance the quality of voice and data users.
    • "Many of these aspects are often neglected or considered in simplistic ways in commonly used network simulators (such as, for instance, Opnet [7] or ns-2 [8]); moreover, the simulation of integrated interworking networks obviously requires the adoption of interworking network simulators, thus preventing from the adoption of commercially available tools. These considerations motivated the development of a dedicated simulation tool which is the integration of UMTS and WLAN simulators we previously developed and utilized for our research activities (e.g., [9], [10]). In particular, we realized a platform with a server-core simulator (hereafter called Upper Layers Simulator, ULS) and one or more client simulators (Lower Layers Simulators, LLS): the ULS takes care of the user-related information, such as its position and movements, and of the end-to-end aspects of each connection, such as the TCP or UDP dynamics and the generation of the application-level traffic. "
    [Show abstract] [Hide abstract] ABSTRACT: In this paper the issue of networks interworking is faced with reference to UMTS cellular networks and IEEE 802.11 wireless local area networks. A feasible architectural solution of the integrated network is given and the possibility to serve by means of the WLAN technology also those voice calls that would be blocked by UMTS, in case of resource saturation, is investigated. The performance level provided by the integrated network in a realistic scenario is here assessed considering both IEEE 802.11a and the forthcoming IEEE 802.11e WLAN technologies for possible integration with UMTS
    Full-text · Conference Paper · Oct 2005
  • [Show abstract] [Hide abstract] ABSTRACT: The investigation of both link and network level aspects is fundamental when a thorough analysis of mobile radio systems is required. The conventional approach, based on a complete separation between the two levels, adopted in the past for the performance evaluation of second generation systems, is not enough accurate for third generation ones, characterized by the presence of both voice and data services as well as circuit and packet switched applications. Here we describe a methodology on how to interface link and network level tools and finally show an example of application
    Conference Paper · May 2006
  • [Show abstract] [Hide abstract] ABSTRACT: In this paper, we propose a link model for TD-SCDMA systems for use by a system-level simulator to estimate block error rates (BLER) without doing time-consuming physical-layer simulations. Our model averages the different qualities of the physical channels using the mutual information between the coded bits at the transmitter and the post-rate-dematching soft information at the receiver, resulting in higher accuracy compared to existing models that average e.g. the raw bit error rate (BER) and that do not take rate-matching into account. Our model also supports the large range of possible coding rates and code block sizes in a generic way, greatly reducing the amount of simulation data that have to be included in the model when many different services are used. Simulations show that the accuracy of our model stays within 0.2 dB for Turbo coding and 0.5 dB for convolutional coding, even in Rayleigh fading channels.
    Conference Paper · Jan 2007
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