 The subframe identifier. slotID - Slot identifier. startSymbolid - The start symbol ID number. numberOfsections - The number of sections. sectionType - The section type. Value = "1" for section type 1. udCompHdr - The user data compression header containing compression method and IQ bit width information. reserved - The reserved field. Payload section fields: sectionID - The section ID used to identify the section. rb - The resource block indicator. symInc - The symbol number increment indicator. startPrbc - The starting physical resource block (PRB) of data section description. 4 NG-RAN Architecture Section Type 1,3 : DL/UL IQ data msgs 0 (msb) 7 (1sb) bytes transport header Octet 1 dataDirection payload Version filterIndex Octet 9 frameld Octet 10 subframeld slotld Octet 11 slotld symbolid Octet 12 sectionld Octet 13 sectionld symlnc startPrbu Octet 14 startPrbu Octet 15 numPrbu Octet 16 udCompHdr (not always present) Octet 17 reserved (not always present) Octet 18 udCompParam (not always present) Octet 17/19 iSample (1st RE in the PRB) Octet 18/20 qSample (1st RE in the PRB) Octet 19/21* iSample (12th RE in the PRB) Octet 40/42* qSample (12st RE in the PRB) Octet 41/43* udCompParam (not always present) Octet 42/44* iSample (1st RE in the PRB) Octet 43/45* qSample (1st RE in the PRB) Octet 44/46* iSample (12th RE in the PRB) Octet 65/67* qSample (12st RE in the PRB) Octet 66/68* sectionld Octet M sectionld symlnc startPrbu startPrbu numPrbu udCompHdr (not always present) reserved (not always present) udCompParam (not always present) M + 4/5 iSample (1st RE in the PRB) M + 5/7 qSample (1st RE in the PRB) M + 6/8* iSample (12th RE in the PRB) M + 27/29* qSample (12st RE in the PRB) M + 28/30* udCompParam (not always present) M + 29/31* iSample (1st RE in the PRB) M + 30/32* qSample (1st RE in the PRB) M + 31/33* iSample (12th RE in the PRB) M + 52/54* qSample (12st RE in the PRB) M + 53/55* Figure 4.5.11 Data plane message format. (Source: Reproduced by permission of © O-RAN). numPrbc - The number of contiguous 