name: SDU
full_form: Service Data Unit
context: is set to the same value as the down link (DL) RLC SDU block size then the complete user data block shall be returned, see figure 5.3.2.6.2.1. Figure 5.3.2.6.2.1: DL and UL RLC SDU block size equal (DL RLC SDU size = UL RLC SDU size = N) For the case when the "UL RLC SDU size" parameter is set to a value less than the down link (DL) RLC SDU block size then the UE shall return the first K bits of the received block, where K is the UL block size, see figure 5.3.2.6.2.2. Figure 5.3.2.6.2.2: DL > UL RLC SDU block size (DL RLC SDU size = N, UL RLC SDU size = K) For the case when the "UL RLC SDU size" parameter is set to a value bigger than the down link (DL) RLC SDU block size then the UE shall pad the UL send block by repeating the received data block until the UL send block has been filled (truncating the last block if necessary), see figure 5.3.2.6.2.3. Figure 5.3.2.6.2.3: DL < UL RLC SDU block size (DL RLC SDU size = N, UL RLC SDU size = 2*N + K) For the case of loopback of data from
description: Service Data Unit (SDU) is a parameter that refers to the block size of user data transmitted over the Radio Link Control (RLC) protocol in a telecommunications network. It is used to determine how much data is sent or received in a single transmission.
explanation: The context describes SDU as a parameter that defines the size of data blocks handled by the RLC protocol, directly influencing data transmission characteristics.
section_title: 5.3.2.6.2Loopback of RLC SDUs
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