name: TFS
full_form: Transport Format Set
context: As popular voice solution for operators, CS Fallback to UTRAN with redirection is applicable for Scenario 3, in which collocated UMTS establishes CS bearer for voice. In the current CSFB procedure, it first sets up an RRC connection in E-UTRAN with the extended service request procedure (dash area in Figure 7.3.1.1-1), which takes time to set up RRC Connection and to exchange S1 messages. However, RRC resources in E-UTRAN will later be released since voice service should be finally accomplished in UTRAN. During these procedures, there is no key information exchange between UTRAN and E-UTRAN nodes. Therefore, in order to save the RRC connection setup/release latency and minimize the S1 signalling overhead, redirection procedures could be improved by adding MO call type information (including e.g., PS and CS indicator) into RRC connection request in the serving RAT. Figure 7.3.1.1-1: Illustration of MO CS call according to current specifications.
description: The Transport Format Set (TFS) is a parameter that defines the set of transport formats used on a specific transport channel (TrCH). It plays a crucial role in determining how data is transmitted over the air interface, particularly when multiple transport formats are employed. The TFS influences the detection method for the transport format, which can be based on Transport Format Combination Indicator (TFCI), explicit blind detection, or guided detection.
explanation: The context describes TFS as a parameter that configures transport formats used on a transport channel, directly impacting data transmission methods. This classification aligns with the definition of a parameter as a configurable setting within a system.
section_title: 4.3	Transport format detection
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