name: RSU
full_form: Roadside unit
context: Each sidelink packet is associated with a PPPP and PPPR passed down ultimately to the physical layer from upper layers, which determine the values based on the QoS requirements of the message. PPPR allows management of reliability, for example see Clause 5.4.7. The PPPP of a packet is indicated dynamically in the SCI which schedules the PSSCH for the packet. A physical measurement of CBR is also defined in each subframe TS 36.214 [12, clause 5.1.30], which measures the portion of the resource in a resource pool which has a high received signal energy (S-RSSI) in the most recent 100 subframes. CBR is a measurement of the congestion present recently in the resource pool. Another measurement, CR defined in TS 36.214 [12, clause 5.1.31], counts the total number of subchannels a UE has and will transmit in during a window of up to 1000 ms including the current subframe. CR is thus a measurement of how much resource a UE has recently, and will soon, claim. A UE can be (pre-)configured with a
description: A Roadside Unit (RSU) is a stationary infrastructure entity that supports V2X applications and can exchange messages with other entities supporting V2X applications. It operates using the functionality provided by either a 3GPP network or a UE, and its deployment nature differs from eNB/gNB or UE.
explanation: The context describes RSU as an entity in the network that supports V2X applications, which indicates it is a functional component within the network. Although it's mentioned that RSU is different from eNB/gNB or UE only in terms of deployment nature, its role in supporting V2X applications and interacting with other entities places it under the category of Network Function.
section_title: 10	Roadside unit
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