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Content for  TS 38.323  Word version:  18.0.0

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6  Protocol data units, formats, and parametersp. 34

6.1  Protocol data unitsp. 34

6.1.1  Data PDUp. 34

The PDCP Data PDU is used to convey one or more of followings in addition to the PDU header:
  • user plane data;
  • control plane data;
  • a MAC-I.

6.1.2  Control PDUp. 34

The PDCP Control PDU is used to convey one of followings in addition to the PDU header:
  • a PDCP status report;
  • an interspersed ROHC feedback;
  • an EHC feedback;
  • a UDC feedback.

6.2  Formatsp. 34

6.2.1  Generalp. 34

A PDCP PDU is a bit string that is byte aligned (i.e. multiple of 8 bits) in length. In the figures in clause 6.2, bit strings are represented by tables in which the most significant bit is the leftmost bit of the first line of the table, the least significant bit is the rightmost bit on the last line of the table, and more generally the bit string is to be read from left to right and then in the reading order of the lines. The bit order of each parameter field within a PDCP PDU is represented with the first and most significant bit in the leftmost bit and the last and least significant bit in the rightmost bit.
PDCP SDUs are bit strings that are byte aligned (i.e. multiple of 8 bits) in length. A compressed or uncompressed SDU is included into a PDCP Data PDU from the first bit onward.
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6.2.2  Data PDUp. 34

6.2.2.1  Data PDU for SRBsp. 34

Figure 6.2.2.1-1 shows the format of the PDCP Data PDU with 12 bits PDCP SN. This format is applicable for SRBs.
Reproduction of 3GPP TS 38.323, Fig. 6.2.2.1-1: PDCP Data PDU format for SRBs
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6.2.2.2  Data PDU for DRBs and MRBs with 12 bits PDCP SNp. 35

Figure 6.2.2.2-1 shows the format of the PDCP Data PDU with 12 bits PDCP SN. This format is applicable for UM DRBs, AM DRBs, UM MRBs and AM MRBs.
Reproduction of 3GPP TS 38.323, Fig. 6.2.2.2-1: PDCP Data PDU format with 12 bits PDCP SN
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6.2.2.3  Data PDU for DRBs and MRBs with 18 bits PDCP SNp. 35

Figure 6.2.2.3-1 shows the format of the PDCP Data PDU with 18 bits PDCP SN. This format is applicable for UM DRBs, AM DRBs, UM MRBs and AM MRBs.
Reproduction of 3GPP TS 38.323, Fig. 6.2.2.3-1: PDCP Data PDU format for DRBs with 18 bits PDCP SN
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6.2.2.4  Data PDU for sidelink DRBs for groupcast and broadcast, for the sidelink SRB0 and for the sidelink SRB4 |R16|p. 36

Figure 6.2.2.4-1 shows the format of the PDCP Data PDU with 12 bits PDCP SN. This format is applicable for sidelink DRBs for groupcast and broadcast, for the sidelink SRB0 and for the sidelink SRB4.
Reproduction of 3GPP TS 38.323, Fig. 6.2.2.4-1: PDCP Data PDU format for sidelink DRBs for groupcast and broadcast, for the sidelink SRB0 and for the sidelink SRB4
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6.2.2.5  Data PDU for sidelink SRBs for unicast |R16|p. 36

Figure 6.2.2.5-1 shows the format of the PDCP Data PDU with 12 bits PDCP SN. This format is applicable for sidelink SRB1, SRB2 and SRB3 for unicast.
Reproduction of 3GPP TS 38.323, Fig. 6.2.2.5-1: PDCP Data PDU format for sidelink SRB1, SRB2 and SRB3 for unicast
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6.2.2.6  Data PDU for sidelink DRBs for unicast with 12 bits PDCP SN |R16|p. 37

Figure 6.2.2.6-1 shows the format of the PDCP Data PDU with 12 bits PDCP SN. This format is applicable for sidelink DRBs for unicast.
Reproduction of 3GPP TS 38.323, Fig. 6.2.2.6-1: PDCP Data PDU format for sidelink DRBs for unicast with 12 bits PDCP SN
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6.2.2.7  Data PDU for sidelink DRBs for unicast with 18 bits PDCP SN |R16|p. 38

Figure 6.2.2.7-1 shows the format of the PDCP Data PDU with 18 bits PDCP SN. This format is applicable for sidelink DRBs for unicast.
Reproduction of 3GPP TS 38.323, Fig. 6.2.2.7-1: PDCP Data PDU format for sidelink DRBs for unicast with 18 bits PDCP SN
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