Base Station Subsystem Pdf Download
This subsystem is also referred to as the transcoder and rate adaptation unit (TRAU). Generally carried by a DS-1, ES-1, or E1 TDM circuit. This article needs additional citations for verification. Contents 1 Base transceiver station 1.1 Sectorization 2 Base station controller 2.1 Transcoder 3 Packet control unit 4 BSS interfaces 5 See also 6 References 7 External links . The BSC handles allocation of radio channels, receives measurements from the mobile phones, and controls handovers from BTS to BTS (except in the case of an inter-BSC handover in which case control is in part the responsibility of the anchor MSC).
Specifically, GSM uses a regular pulse excited-long term prediction (RPE-LTP) coder for voice data between the mobile device and the BSS, but pulse code modulation (A-law or -law standardized in ITU G.711) upstream of the BSS. The packet control unit (PCU) is a late addition to the GSM standard. Typically these directional antennas have a beamwidth of 65 to 85 degrees. Several hopping sequences are available, and the sequence in use for a particular cell is continually broadcast by that cell so that it is known to the handsets. It is a proprietary interface whose name depends on the vendor (for example Ater by Nokia), it carries the A interface information from the BSC leaving it untouched. The reason for these designs is that if the compression of voice channels is done at the site of the MSC, the number of fixed transmission links between the BSS and MSC can be reduced, decreasing network infrastructure costs. Traffic and signaling are sent in bursts of 0.577ms at intervals of 4.615ms, to form data blocks each 20ms.
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