name: PUR
full_form: Preconfigured Uplink Resource
context: where data can be transmitted already in Msg3 during the random-access procedure. In Rel-16, the earlier transmission of UL data payload has been further enhanced by introducing UL transmission using preconfigured uplink resources (PUR). When the feature is configured, both the random-access preamble transmission (Msg1) and the random-access response (Msg2) can be omitted, and the data transmission can be completed in only two messages (i.e., Msg3 and Msg4). The UE is configured with PUR via dedicated RRC signaling while in connected mode. Configuring a UE with PUR can be triggered by the network or requested by the UE. Before performing a PUR transmission, the UE must evaluate the validity of the timing advance (TA) based on either individual or combined usage of any of the following attributes: a) serving cell change, b) TA timer, c) RSRP change. Additionally, it is possible to configure the TA as always valid within a given cell. There are two schemes for transmitting using PUR,
description: Preconfigured Uplink Resource (PUR) is a feature in LTE that enables earlier transmission of uplink data payload during the random-access procedure, allowing data to be transmitted already in Msg3. It introduces UL transmission using preconfigured uplink resources, which can omit the random-access preamble transmission and response, completing data transmission in only two messages.
explanation: PUR is classified as a Technology because it represents a new method for transmitting data within the LTE network. Its functionality directly impacts the performance and efficiency of cellular communication.
section_title: 7.3	Additional MTC enhancements for LTE
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