name: CTD
full_form: Cell Transfer Delay
context: â For each DCH which do not belong to a set of co-ordinated DCHs and which includes a QE-Selector IE set to âselectedâ, the DRNS shall use the Transport channel BER from that DCH for the QE in the UL data frames. If no Transport channel BER is available for the selected DCH, the DRNS shall use the Physical channel BER for the QE, TS 25.427 [4]. If the QE-Selector IE is set to ânon-selectedâ, the DRNS shall use the Physical channel BER for the QE in the UL data frames, TS 25.427 [4].] - For a set of co-ordinated DCHs, the DRNS shall use the Transport channel BER from the DCH with the QE-Selector IE set to âselectedâ for the QE in the UL data frames, TS 25.427 [4]. [FDD â If no Transport channel BER is available for the selected DCH, the DRNS shall use the Physical channel BER for the QE, TS 25.427 [4]. If all DCHs have the QE-Selector IE set to ânon-selectedâ, the DRNS shall use the Physical channel BER for the QE, TS 25.427 [4].] [TDD â If no Transport channel BER is available for the
description: Cell Transfer Delay (CTD) is a measurement parameter used to quantify the delay experienced during cell transfer in a telecommunications network. It is an important factor in determining the Quality of Service (QoS) for user traffic, particularly within the boundaries of stringent class as defined by ITU-T's I.356 recommendation.
explanation: The text explicitly states that CTD is a 'measurement parameter' used to quantify delay. It directly influences QoS, a key metric in telecommunications performance evaluation. Therefore, it falls under the category of Measurements.
section_title: 6.1.1	Path type capability
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