Content for TS 36.425 Word version: 18.0.0
5 X2 user plane protocol
5.1 General
5.2 X2 user plane protocol layer services
5.3 Services expected from the X2 Transport Network Layer
5.4 Elementary procedures
5.5 Elements for the X2 user plane protocol
5.6 Handling of unknown, unforeseen and erroneous protocol data
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5 X2 user plane protocol p. 7
5.1 General p. 7
5.2 X2 user plane protocol layer services p. 7
5.3 Services expected from the X2 Transport Network Layer p. 7
5.4 Elementary procedures p. 8
5.5 Elements for the X2 user plane protocol p. 10
5.5.1 General p. 10
5.5.2 Frame format for the X2 user plane protocol p. 11
5.5.2.1 DL USER DATA (PDU Type 0) p. 11
5.5.2.2 DL DATA DELIVERY STATUS (PDU Type 1) p. 12
5.5.2.3 DL DATA DELIVERY STATUS EXTENDED (PDU Type 2) p. 12
5.5.2.4 DL USER DATA EXTENDED (PDU Type 3) p. 13
5.5.3 Coding of information elements in frames p. 14
5.5.3.1 PDU Type p. 14
5.5.3.2 Spare p. 14
5.5.3.3 X2-U Sequence Number p. 14
5.5.3.4 Lost Packet Report p. 14
5.5.3.5 Final Frame Indication p. 14
5.5.3.6 Highest successfully delivered PDCP Sequence Number p. 14
5.5.3.7 Desired buffer size for the E-RAB p. 14
5.5.3.8 Minimum desired buffer size for the UE p. 15
5.5.3.9 Number of lost X2-U Sequence Number ranges reported p. 15
5.5.3.10 Start of lost X2-U Sequence Number range p. 15
5.5.3.11 End of lost X2-U Sequence Number range p. 15
5.5.3.12 Padding p. 15
5.5.3.13 Highest successfully delivered PDCP Sequence Number Extended p. 15
5.5.3.14 Start of lost X2-U Sequence Number range Extended p. 15
5.5.3.15 End of lost X2-U Sequence Number range Extended p. 16
5.5.3.16 X2-U Sequence Number Extended p. 16
5.5.4 Timers p. 16
5.6 Handling of unknown, unforeseen and erroneous protocol data p. 16
$ Change History p. 17
