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TBF
TBF is defined as follows in 44.160 - 5.2.1 Temporary Block Flow :
A TBF is a logical connection used by two MAC entities to support the unidirectional transfer of upper-layer PDUs on basic physical sub-channels.
It is a connection established between a Mobile Station (MS) and a Base Station (BS) to enable packet exchanges between the BS and MS entities in GPRS networks.
In a typical GPRS system, the network needs to establish a downlink (DL) TBF to transfer data in the DL direction and an uplink (UL) TBF to transfer data in the UL direction. TBFs are typically short-lived and are generally only active during data transfers. i.e. until there are no more RLC (Radio Link Control) / MAC (Medium Access Control) blocks to be transmitted
One example of TBFs in a protocol stack is illustrated below :
< 44.160 - Figure 4.2: Radio Interface Protocol architecture with FLO only >
TBF operation varies depending onto which channel it mapped as described below (based on 44.160-5.2.1 Temporary Block Flow) :
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