The Extended Uplink TBF parameter extends the time period before an uplink TBF is released. The TBF is extended for a period of time (set by the network), following the reception of a data block marked with a Countdown Value of zero (CV=0). 3GPP TS 44.060 Version 6.14.0 states, "In the extended uplink TBF mode, the uplink TBF may be maintained during temporary inactive periods, where the mobile station has no RLC information to send." An extended uplink TBF allows the mobile station to reuse the uplink TBF for subsequent data transfers without the need for TBF re-establishment, thereby reducing the latency involved between uplink data transfers.The network's support for extended uplink TBF is broadcasted on the (P)BCCH within a (Packet) System Information message. The mobile station must have explicit support for the extended uplink functionality to operate correctly.