name: HST
full_form: High Speed Train
context: Concerning the maximum supported speed for FR2 HST RAN4 agreed to use 350kmph as a reference maximum train speed and define RRM requirements to guarantee that. It was agreed to add a flag to enable the UE to identify different/enhanced RRM requirements in HST FR2 deployments. FR2 HST UE has the capacity to support both unidirectional and bidirectional deployment scenarios. RAN4 agreed to introduce network assistance to inform UE on the FR2 HST deployment type (uni-directional or bi-directional). No enhanced requirement should be applied to other than PC6 UEs even when HST FR2 flags are configured. PC6 shall be used to identify the feature support of HST FR2 operation. RAN4 agreed to introduce dedicated new RRC based network signalling flag will be specified to enable/disable one shot large UL timing adjustment. Such RRC based network signalling is not limited to a particular FR2 HST deployment and/or scenarios, i.e., bi-directional scenario or uni-directional scenario. In Scenario A,
description: High Speed Train (HST) refers to the technological capabilities and requirements for supporting high-speed trains in wireless communication networks, particularly in the context of 5G New Radio (NR) deployments.
explanation: The provided context from 3GPP TS 38.854 highlights HST as a specific use case with unique requirements and considerations for radio resource management (RRM) in FR2 deployments. This indicates that HST is a technological aspect of telecommunications, focusing on the standards and capabilities needed to support high-speed train communications.
section_title: 7.2RRM requirements
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