The circuit switched multicall service in UMTS

Pekka Ruuska, Tapio Frantti, Petri Mähönen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific


    The current second-generation cellular mobile networks provide for each user only one simultaneous circuit switched connection. A GSM user can control more than one speech call only by using supplementary service Call Hold (CH). In a CH situation, a user may keep only one call in an active state, while the other calls are on hold [9]. Also with GSM's multiple time slot connections, HSCSD (High Speed Circuit Switched Data), all the time slots are assigned for one user data traffic channel which cannot be used for multicall purpose [1]. In this paper we present multicall concept of the UMTS designed in 3GPP (3:rd Generation Partnership Project) to utilize the wide bandwidth with a new type of user service. This will allow a user to control several simultaneous circuit-switched traffic channels by a single terminal. Parallel traffic channels can be activated dynamically and independently, and their use is not limited to speech or data only. The multicall service can be implemented with minor modifications to the existing GSM Connection Management protocols on which the UMTS Connection Management layer is based.
    Original languageEnglish
    Title of host publicationEvolving towards 4th generation
    Subtitle of host publicationProceedings of the IST Mobile Communications Summit 2000
    Publication statusPublished - 2000
    MoE publication typeNot Eligible
    EventIST Mobile Communications Summit 2000 - Galway, Ireland
    Duration: 1 Oct 20004 Oct 2000


    ConferenceIST Mobile Communications Summit 2000


    Dive into the research topics of 'The circuit switched multicall service in UMTS'. Together they form a unique fingerprint.

    Cite this