By Forrest M. Mims III
Archer Cat. No. 276-5015
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Additional resources for Engineer's Mini-Notebook: Communication Projects
Example text
The IMSI and IMEI provide the capability for personal and terminal mobility, respectively. The radio interface between the MT and the BTS is termed the Um-interface and is one of the two mandatory interfaces in the GSM network. Base Station System (BSS) The BTS forms part of the base station system (BSS), along with the base station controller (BSC). The BTS provides the radio coverage per cell, while the BSC performs the necessary control functions, which include channel allocation and local switching to achieve handover when a mobile moves from one BTS to another under the control of the same BSC.
8 kbit/s. An access channel is associated with a particular paging channel, and from the above discussion on the forward link, it can be seen that up to seven access channels can exist. As before, the TCH supports Rate Set 1 and may support Rate Set 2. 4 kbit/s for Rate Set 2, depending on speech activity. 2 kbit/s corresponds to the transmission of no speech. Data are organised into 20-ms frames. For Rate Set 1, this is then encoded using a 1/3-rate convolutional encoder with a constraint length of 9.
Of the 260 bits in a 20-ms frame, 182 bits are termed ‘‘Class 1’’. The Class 1 bits are further divided into 50 Class 1a bits, which are most sensitive to bit errors, and Class 1b bits, which account for the other 132 bits. Three cyclic redundancy code bits are added to the Class 1a bits, which are then added to the Class 1b bits, before adding four tail bits resulting in 189 bits in total. These bits are then subject to half-rate convolutional coding. 4). The output of the error correction device is fed into the channel coder, which performs interleaving of the bits.
