The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

E Katsaros - One of the best experts on this subject based on the ideXlab platform.

  • monitoring the end user perceived speech quality using the derivative mean opinion score mos key performance indicator
    Personal Indoor and Mobile Radio Communications, 2007
    Co-Authors: K Vlahodimitropoulos, E Katsaros
    Abstract:

    A mathematical matrix formalism which combines network management system (NMS) statistics from Cosmote GSM land mobile radio network and MOS measurements derived from drive tests are used, in order to extract a derivative MOS key performance indicator. Initially, the calculation is performed in a base station controller (BSC) area and then base transceiver stations (BTS) MOS distribution patterns are examined for different speech encodings. Examples of speech encoding effectiveness evaluation are performed using the previous speech encoding distribution patterns. Moreover, the effect of mobile station (MS) technology on different speech encodings is pointed out. Ultimately, different speech encodings are compared using quality and speech codec distribution patterns.

  • PIMRC - Monitoring the End User Perceived Speech Quality using the Derivative Mean Opinion Score (MOS) Key Performance Indicator
    2007 IEEE 18th International Symposium on Personal Indoor and Mobile Radio Communications, 2007
    Co-Authors: K Vlahodimitropoulos, E Katsaros
    Abstract:

    A mathematical matrix formalism which combines network management system (NMS) statistics from Cosmote GSM land mobile radio network and MOS measurements derived from drive tests are used, in order to extract a derivative MOS key performance indicator. Initially, the calculation is performed in a base station controller (BSC) area and then base transceiver stations (BTS) MOS distribution patterns are examined for different speech encodings. Examples of speech encoding effectiveness evaluation are performed using the previous speech encoding distribution patterns. Moreover, the effect of mobile station (MS) technology on different speech encodings is pointed out. Ultimately, different speech encodings are compared using quality and speech codec distribution patterns.

Jee-hwan Ahn - One of the best experts on this subject based on the ideXlab platform.

  • ICON - A call handling capacity of base station controller group for mobile originated calls in the CDMA mobile system
    IEEE International Conference on Networks. ICON '99 Proceedings (Cat. No.PR00243), 1
    Co-Authors: Byung-han Ryu, Jee-hwan Ahn
    Abstract:

    In this paper, we first describe the architecture of the base station (BS) in the CDMA mobile system (CMS) and then model one base station controller group (BSCG) as a queueing network. By using an analytic method for the given queueing network model, we evaluate the mean waiting time at each transmission node in the packet networks between the traffic channel element (TCE) in the base station transceiver subsystem (BTS) and selector in the base station controller (BSC). As the transmission technology for the traffic data from TCE to BSC during the call conversation time, we consider two kinds of transmission schemes such as the frame non-staggering scheme and the frame staggering scheme. Then, we evaluate the delay time of traffic data from the TCE to the selector and the quality degradation probability by simulation. based on these results, we present the call handling capacity of one BSC group for mobile-originated calls in the CMS (CDMA mobile system).

  • ICECS - A call handling capacity of base station controller group for mobile originated calls in the CDMA mobile system
    ICECS'99. Proceedings of ICECS '99. 6th IEEE International Conference on Electronics Circuits and Systems (Cat. No.99EX357), 1
    Co-Authors: Byung-han Ryu, Jee-hwan Ahn
    Abstract:

    In this paper, we first describe the architecture of base station (BS) in the CDMA mobile system (CMS) and then model one base station controller group (BSCG) as a queueing network. By using an analytic method for the given queueing network model, we evaluate the mean waiting time at each transmission node in the packet networks between traffic channel element (TCE) in the base station transceiver subsystem (BSC) and selector in the base station controller (BSC). As the transmission technology for the traffic data from TCE during the call conversation time, we consider two kinds of transmission schemes such as the frame non-staggering scheme and the frame staggering scheme. Then, we evaluate the traffic data transfer delay from the TCE to the selector and the quality degradation probability by simulation. based on these results, we present the call handling capacity of one BSC group for mobile originated calls in the CMS.

  • Performance evaluation for low bit-rate voice traffic in IMT-2000 network
    Proceedings of IEEE. IEEE Region 10 Conference. TENCON 99. 'Multimedia Technology for Asia-Pacific Information Infrastructure' (Cat. No.99CH37030), 1
    Co-Authors: Byung-han Ryu, Jee-hwan Ahn, Soon-yong Lim, Jang Hyun Baek
    Abstract:

    We present the system performance when the voice traffic is constructed as the ATM Adaptation Layer type 2 (AAL-2) and then it is transmitted to the base station controller (BSC) from the base station transceiver subsystem (BTS) in the International Mobile Telecommunication-2000 (IMT-2000) network. We first describe the configuration of the BTS and the BSC, and then model them as a queueing network. Through a simulation study, we present the timeout time that should be set for multiplexing the user packets at the line interface unit (LIU) and evaluate the processing capacity of the call control blocks and the transmission efficiency of the physical links. Finally, we present the transmission delay time from the radio channel element (RCE) to the selector & transcoder subsystem (STS) for the offered traffic which can be simultaneously accommodated on one E1 link.

K Vlahodimitropoulos - One of the best experts on this subject based on the ideXlab platform.

  • monitoring the end user perceived speech quality using the derivative mean opinion score mos key performance indicator
    Personal Indoor and Mobile Radio Communications, 2007
    Co-Authors: K Vlahodimitropoulos, E Katsaros
    Abstract:

    A mathematical matrix formalism which combines network management system (NMS) statistics from Cosmote GSM land mobile radio network and MOS measurements derived from drive tests are used, in order to extract a derivative MOS key performance indicator. Initially, the calculation is performed in a base station controller (BSC) area and then base transceiver stations (BTS) MOS distribution patterns are examined for different speech encodings. Examples of speech encoding effectiveness evaluation are performed using the previous speech encoding distribution patterns. Moreover, the effect of mobile station (MS) technology on different speech encodings is pointed out. Ultimately, different speech encodings are compared using quality and speech codec distribution patterns.

  • PIMRC - Monitoring the End User Perceived Speech Quality using the Derivative Mean Opinion Score (MOS) Key Performance Indicator
    2007 IEEE 18th International Symposium on Personal Indoor and Mobile Radio Communications, 2007
    Co-Authors: K Vlahodimitropoulos, E Katsaros
    Abstract:

    A mathematical matrix formalism which combines network management system (NMS) statistics from Cosmote GSM land mobile radio network and MOS measurements derived from drive tests are used, in order to extract a derivative MOS key performance indicator. Initially, the calculation is performed in a base station controller (BSC) area and then base transceiver stations (BTS) MOS distribution patterns are examined for different speech encodings. Examples of speech encoding effectiveness evaluation are performed using the previous speech encoding distribution patterns. Moreover, the effect of mobile station (MS) technology on different speech encodings is pointed out. Ultimately, different speech encodings are compared using quality and speech codec distribution patterns.

M. Mouly - One of the best experts on this subject based on the ideXlab platform.

  • GSM protocol architecture: radio sub-system signalling
    [1991 Proceedings] 41st IEEE Vehicular Technology Conference, 1
    Co-Authors: M.-b. Pautet, M. Mouly
    Abstract:

    The radio subsystem signaling of the GSM (Global System for Mobile Communication) is described. Particular attention is given to the air interface, the Abis interface (between radio transceiver equipment and a base station controller) and the A interface (between a base station controller and the switch). The details of the lower layers, particularly on the radio path, are examined. However, the major part of the present work deals with the upper signaling layers. After a general presentation of their organization, the protocols which are specific to GSM are presented, in particular those related to radio resource management and mobility management. >

Byung-han Ryu - One of the best experts on this subject based on the ideXlab platform.

  • ICON - A call handling capacity of base station controller group for mobile originated calls in the CDMA mobile system
    IEEE International Conference on Networks. ICON '99 Proceedings (Cat. No.PR00243), 1
    Co-Authors: Byung-han Ryu, Jee-hwan Ahn
    Abstract:

    In this paper, we first describe the architecture of the base station (BS) in the CDMA mobile system (CMS) and then model one base station controller group (BSCG) as a queueing network. By using an analytic method for the given queueing network model, we evaluate the mean waiting time at each transmission node in the packet networks between the traffic channel element (TCE) in the base station transceiver subsystem (BTS) and selector in the base station controller (BSC). As the transmission technology for the traffic data from TCE to BSC during the call conversation time, we consider two kinds of transmission schemes such as the frame non-staggering scheme and the frame staggering scheme. Then, we evaluate the delay time of traffic data from the TCE to the selector and the quality degradation probability by simulation. based on these results, we present the call handling capacity of one BSC group for mobile-originated calls in the CMS (CDMA mobile system).

  • ICECS - A call handling capacity of base station controller group for mobile originated calls in the CDMA mobile system
    ICECS'99. Proceedings of ICECS '99. 6th IEEE International Conference on Electronics Circuits and Systems (Cat. No.99EX357), 1
    Co-Authors: Byung-han Ryu, Jee-hwan Ahn
    Abstract:

    In this paper, we first describe the architecture of base station (BS) in the CDMA mobile system (CMS) and then model one base station controller group (BSCG) as a queueing network. By using an analytic method for the given queueing network model, we evaluate the mean waiting time at each transmission node in the packet networks between traffic channel element (TCE) in the base station transceiver subsystem (BSC) and selector in the base station controller (BSC). As the transmission technology for the traffic data from TCE during the call conversation time, we consider two kinds of transmission schemes such as the frame non-staggering scheme and the frame staggering scheme. Then, we evaluate the traffic data transfer delay from the TCE to the selector and the quality degradation probability by simulation. based on these results, we present the call handling capacity of one BSC group for mobile originated calls in the CMS.

  • Performance evaluation for low bit-rate voice traffic in IMT-2000 network
    Proceedings of IEEE. IEEE Region 10 Conference. TENCON 99. 'Multimedia Technology for Asia-Pacific Information Infrastructure' (Cat. No.99CH37030), 1
    Co-Authors: Byung-han Ryu, Jee-hwan Ahn, Soon-yong Lim, Jang Hyun Baek
    Abstract:

    We present the system performance when the voice traffic is constructed as the ATM Adaptation Layer type 2 (AAL-2) and then it is transmitted to the base station controller (BSC) from the base station transceiver subsystem (BTS) in the International Mobile Telecommunication-2000 (IMT-2000) network. We first describe the configuration of the BTS and the BSC, and then model them as a queueing network. Through a simulation study, we present the timeout time that should be set for multiplexing the user packets at the line interface unit (LIU) and evaluate the processing capacity of the call control blocks and the transmission efficiency of the physical links. Finally, we present the transmission delay time from the radio channel element (RCE) to the selector & transcoder subsystem (STS) for the offered traffic which can be simultaneously accommodated on one E1 link.