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Content for TS 25.415 Word version: 18.0.0

1… 3…

3 Definitions and abbreviations p. 8

3.1 Definitions p. 8

3.2 Abbreviations p. 9

3.3 Concepts p. 9

3.4 Specification Notations p. 10

4 General p. 10

4.1 General aspects p. 10

4.2 Operational and Functional Aspects p. 11

4.2.1 Iu UP protocol modes of operation p. 11

4.2.2 Transparent mode (TrM) p. 11

4.2.3 Support mode p. 12

5 Transparent mode, version 1 p. 13

5.1 General p. 13

5.1.1 Operation of the Iu UP in Transparent mode p. 13

5.1.2 Interfaces of the Iu UP protocol layer in Transparent mode p. 14

5.2 Iu UP Protocol layer Services in Transparent mode p. 14

5.3 Services Expected from the UP Data Transport layer p. 14

5.4 Elements for Iu UP communication in Transparent mode p. 14

5.4.1 Frame Format for transparent mode p. 14

6 Support mode for predefined SDU sizes, version 2 p. 14

6.1 General p. 14

6.1.1 Operation of the Iu UP in Support mode p. 14

6.1.2 Interfaces of the Iu UP protocol layer in Support mode p. 15

6.2 Iu UP Protocol layer Services in Support mode p. 15

6.3 Services Expected from the UP Data Transport layer p. 15

6.4 Functions of the Iu UP Protocol Layer in Support mode p. 16

6.4.1 Functional model of the Iu UP Protocol Layer in Support mode p. 16

6.4.2 Frame Handler function p. 16

6.4.3 Procedure Control functions p. 16

6.4.4 Non Access Stratum Data Streams specific function(s) p. 17

6.4.4.1 Frame Quality Classification function p. 17

6.4.4.1.1 General p. 17

6.4.4.1.2 Handling of FQC information in uplink path p. 17

6.4.4.1.3 Handling of FQC information in downlink path p. 18

6.5 Elementary procedures p. 18

6.5.1 Transfer of User Data procedure p. 18

6.5.1.1 Successful operation p. 18

6.5.1.2 Unsuccessful operation p. 19

6.5.2 Initialisation procedure p. 20

6.5.2.1 Successful operation p. 20

6.5.2.2 Unsuccessful operation p. 22

6.5.3 Iu Rate Control procedure p. 22

6.5.3.1 Successful operation p. 22

6.5.3.2 Unsuccessful operation p. 23

6.5.3.2A Frequent Rate Control Procedures |R4| p. 24

6.5.4 Time Alignment procedure p. 25

6.5.4.1 Successful operation p. 25

6.5.4.2 Unsuccessful operation p. 26

6.5.5 Handling of Error Event procedure p. 27

6.5.5.1 Successful operation p. 27

6.5.5.2 Unsuccessful operation p. 27

6.5.6 Frame Quality Classification procedure p. 28

6.6 Elements for Iu UP communication in Support mode p. 28

6.6.1 General p. 28

6.6.2 Frame Format for predefined size SDUs p. 29

6.6.2.1 PDU Type 0 p. 29

6.6.2.2 PDU Type 1 p. 30

6.6.2.3 PDU Type 14 p. 31

6.6.2.3.1 General p. 31

6.6.2.3.2 Positive Acknowledgement p. 32

6.6.2.3.3 Negative Acknowledgement p. 33

6.6.2.3.4 Procedures Coding p. 34

6.6.3 Coding of information elements in frames p. 37

6.6.3.1 PDU Type p. 37

6.6.3.2 Ack/Nack p. 37

6.6.3.3 Frame Number p. 38

6.6.3.4 PDU Type 14 Frame Number p. 38

6.6.3.5 Frame Quality Classification (FQC) p. 38

6.6.3.6 RAB sub-Flow Combination Indicator (RFCI) p. 39

6.6.3.7 Procedure Indicator p. 39

6.6.3.8 Header CRC p. 39

6.6.3.9 Payload CRC p. 39

6.6.3.10 Chain Indicator p. 39

6.6.3.11 Number of Subflows per RFCI p. 39

6.6.3.12 Length Indicator (LI) p. 39

6.6.3.13 Number of RFCI Indicators p. 40

6.6.3.14 RFCI n Indicator p. 40

6.6.3.15 Error distance p. 40

6.6.3.16 Error Cause value p. 40

6.6.3.17 Padding p. 41

6.6.3.18 Time alignment p. 41

6.6.3.19 Spare p. 41

6.6.3.20 Spare extension p. 41

6.6.3.21 LRI, Last RFCI Indicator p. 41

6.6.3.22 Length of subflow p. 42

6.6.3.23 TI p. 42

6.6.3.24 IPTI of nth RFCI p. 42

6.6.3.25 Iu UP Mode versions supported p. 42

6.6.3.26 Iu UP Mode Version p. 42

6.6.3.27 Payload fields p. 42

6.6.3.28 Data PDU type p. 43

6.6.4 Timers p. 43

6.6.5 Maximum values of repetition counters p. 43

6.7 Handling of unknown, unforeseen and erroneous protocol data p. 43

6.7.1 General p. 43

6.7.2 Error detected by Iu UP functions p. 44

6.7.3 Request by upper layers p. 44

6.7.4 Error event frame over the Iu UP protocol p. 44

6.7.5 Handling of error reports p. 44

6.7.5.1 General p. 44

6.7.5.2 Error distance p. 45

6.7.6 List of errors in Iu UP p. 46

6.7.7 Error detection p. 47

6.7.7.1 General p. 47

6.7.7.2 CRC Calculation p. 47

6.7.7.3 Relation between input and output of the Cyclic Redundancy Check p. 48

7 Communication Primitives for the Iu UP protocol layer p. 48

7.1 Modelling Principle p. 48

7.2 Primitives towards the upper layers at the RNL SAP p. 48

7.2.1 General p. 48

7.2.2 Iu-UP-DATA-REQUEST p. 49

7.2.3 Iu-UP-DATA-INDICATION p. 50

7.2.4 Iu-UP-STATUS-REQUEST p. 50

7.2.5 Iu-UP-STATUS-INDICATION p. 50

7.2.6 Iu-UP-UNIT-DATA-REQUEST p. 50

7.2.7 Iu-UP-UNIT-DATA-INDICATION p. 50

7.3 Primitives towards the transport layers at TNL SAP p. 50

7.3.1 General p. 50

7.3.2 ATM/AAL2 based Transport layer p. 50

7.3.2.1 General p. 50

7.3.2.2 AAL2 Service Primitives used by the Iu UP protocol p. 51

7.3.3 GTP-U based Transport Layer p. 51

7.3.3.1 General p. 51

7.3.3.2 Generic Service Primitives used by the Iu UP protocol p. 51

7.3.4 RTP based Transport Layer |R5| p. 51

7.3.4.1 General p. 51

7.3.4.2 Generic Service Primitives used by the Iu UP protocol p. 51

8 Evolution of Iu UP Protocol p. 52

8.1 Principles for Protocol Evolution p. 52

8.1.1 Unknown field value p. 52

8.1.2 Adding a new field to an existing frame p. 53

8.1.3 Adding a new PDU type p. 53

8.1.4 Protocol version handling p. 53

A Illustration of usage of RFCI for AMR speech RAB p. 55

B Illustration of protocol states in the Iu UP p. 58

B.1 Protocol state model for transparent mode p. 58

B.1.1 Null State p. 58

B.1.2 Transparent Mode Data Transfer Ready State p. 58

B.2 Protocol state model for support mode for predefined SDU sizes p. 59

B.2.1 Null State p. 59

B.2.2 Initialisation State p. 59

B.2.3 Support Mode Data Transfer Ready State p. 60

C Open Issues of the Iu UP p. 61

D Distributed rate decision within RNC |R4| p. 62

$ Change History p. 63