name: UMD
full_form: UM Data
context: UMD PDU consists of a Data field and an UMD PDU header. The UMD PDU header is byte aligned. When an UMD PDU contains a complete RLC SDU, the UMD PDU header only contains the SI and R fields. An UM RLC entity is configured by RRC to use either a 6 bit SN or a 12 bit SN. For groupcast and broadcast of NR sidelink communication or for SL-SRB4, only 6 bit SN length is configured. An UMD PDU header contains the SN field only when the corresponding RLC SDU is segmented. An UMD PDU carrying the first segment of an RLC SDU does not carry the SO field in its header. The length of the SO field is 16 bits. Figure 6.2.2.3-1: UMD PDU containing a complete RLC SDU Figure 6.2.2.3-2: UMD PDU with 6 bit SN (No SO) Figure 6.2.2.3-3: UMD PDU with 12 bit SN (No SO) Figure 6.2.2.3-4: UMD PDU with 6 bit SN and with SO Figure 6.2.2.3-5: UMD PDU with 12 bit SN and with SO
description: UMD (Unacknowledged Mode Data) is a protocol used for transmitting data in unacknowledged mode. This means the receiver does not send acknowledgments for received data. UMD is used in various telecommunications contexts, including sidelink communication and broadcast scenarios.
explanation: The text describes UMD as a method for data transmission with specific characteristics like unacknowledged reception and applications in telecommunications. The mention of  'UMD PDUs', 'RLC SDU segmentation', 'SN lengths', and 'SO fields' all point towards the structured nature and functionalities typical of a protocol.
section_title: 6.2.2.3UMD PDU
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biotag_Description: B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O