Functionality 2.1 Functionality of the mcBSC The mcBSC manages a variety of tasks ranging from channel administration to short messaging service. The most important basic and optional functionalities are explained briefly below. For more details, see BSS feature descriptions. 2.1.1 General functionalities Call control Basic Call provides speech and data services to the mobile subscriber by offering the means for establishing speech calls with half or full rate or data calls with full rate radio channels. Management of radio channels • Management of common signaling of traffic channel configurations • Management of traffic channels (TCH) and standalone dedicated control channels (SDCCH): • Resource management • Channel allocation • Link supervision • Channel release • Power control • Management of broadcast control channels (BCCH) and common control channels (CCCH): • Random access • Access grant • Paging • System information broadcast • Management of frequency hopping which enables effective use of radio res ources and enhanced voice quality for GSM subscriber • Handovers Existing handover types are: • Intra -BSC, intra-cell (both intra-TRX and inter-TRX), which means that the handover takes place within the area controlled by the BSC and the mobile stays in the same cell • Intra -BSC, inter-cell, which means that the mobile stays in the area of the BSC but moves from one cell to another • Inter -BSC, both outgoing and incoming, which means that the mobile moves into the area of another BSC The handover threshold comparison includes the evaluation of uplink/downlink level, quality and interference, MS-BTS distance evaluation, the evaluation of a rapid field drop, the detection of a fast/ slow-moving mobile station (MS), the detection of a turnaround- corner MS, power budget evaluation, and umbrella handover evaluation. If two or more criteria for a handover are present simultaneously, the handover is done
according to the priority order. GPRS/EDGE packet data handling • Connection establishment and management • Res ource allocation • Scheduling • Data transfer • MS uplink power control • Gb load sharing (uplink) • Flow control (downlink) Maintenance The mcBSC offers the possibility for the following maintenance procedures: • Fault localization for the mcBSC • Reconfi guration of the mcBSC • Reconfiguration support to the BTS • Updating of the software in the mcBSC, Multicontroller TC (mcTC), and BTS Operation During normal operation, the mcBSC offers various possibilities for the operator: • Modification of the paramet ers of the mcBSC and the BTS • Modification of the radio network parameters • Configuration of the mcBSC hardware • Administration of the mcBSC equipment Measurements and observations To run the network effectively, that is, to minimize costs and maximize service quality to the subscriber, the information on the performance and service level of the mcBSC and the radio network is needed. It is useful to know how much traffic different cells carry,
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- Fall '19