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ETSI TS 102 744-3-2

V1.1.1 (2015-10)

Satellite Earth Stations and Systems (SES);

Family SL Satellite Radio Interface (Release 1);

Part 3: Control Plane and User Plane Specifications;

Sub-part 2: Bearer Control Layer Operation

TECHNICAL SPECIFICATION

ETSI

ETSI TS 102 744

2 V1.1.1 (2015

10)

Reference

DTS/SES-00299-3-2

Keywords

3GPP, GPRS, GSM, GSO, interface, MSS, radio,

satellite, TDM, TDMA, UMTS

ETSI

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Sous-Préfecture de Grasse (06) N° 7803/88

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DECT

, PLUGTESTS

, UMTS

and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.

3GPP

and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and

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GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.

ETSI

ETSI TS 102 744

2 V1.1.1 (2015

10)

Contents

Intellectual Property Rights ................................................................................................................................ 7

Foreword ............................................................................................................................................................. 7

Modal verbs terminology .................................................................................................................................... 7

Introduction ........................................................................................................................................................ 7

1 Scope ........................................................................................................................................................ 8

2 References ................................................................................................................................................ 8

2.1 Normative references ......................................................................................................................................... 8

2.2 Informative references ........................................................................................................................................ 9

3 Symbols and abbreviations ....................................................................................................................... 9

3.1 Symbols .............................................................................................................................................................. 9

3.2 Abbreviations ..................................................................................................................................................... 9

4 General Architecture ................................................................................................................................ 9

5 Bearer Control Services.......................................................................................................................... 11

5.1 Bearer Control Service Access Points .............................................................................................................. 11

5.1.0 General ........................................................................................................................................................ 11

5.1.1 Services provided to Upper Layers ............................................................................................................. 11

5.1.2 Services Expected from the Lower Layers ................................................................................................. 11

5.1.3 Services Expected from External Entities ................................................................................................... 12

5.2 Bearer Control Layer Service Primitives .......................................................................................................... 12

5.2.1 Data Transfer Service Access Points .......................................................................................................... 12

5.2.1.1 BCt-DATA-SAP Primitives and Parameters......................................................................................... 12

5.2.1.2 BCt-UCDATA-SAP Primitives and Parameters ................................................................................... 12

5.2.2 Navigational Interface Service Access Points............................................................................................. 12

5.2.2.1 BCt-NAV-SAP (Maritime and Land-Mobile Class UE Only) .............................................................. 12

5.2.2.2 BCt_NAV_SAP Interface with avionics (Aeronautical Class UE Only) .............................................. 13

5.2.3 Control Plane SAPs .................................................................................................................................... 14

5.2.3.1 STATUS-SAP Primitives and Parameters ............................................................................................ 14

5.2.3.2 BCt-COM-SAP Primitives and Parameters .......................................................................................... 16

5.2.3.3 CBCt-SAP Primitives and Parameters .................................................................................................. 16

6 Bearer Control Architecture ................................................................................................................... 17

6.1 Bearer Control Architecture - UE Side ............................................................................................................. 17

6.2 Overview of Functional Entities in the Bearer Control Layer .......................................................................... 17

6.2.0 General ........................................................................................................................................................ 17

6.2.1 Bearer Control Manager (BCtM) ................................................................................................................ 18

6.2.1.0 General .................................................................................................................................................. 18

6.2.1.1 System Information Broadcast Handling Unit ...................................................................................... 18

6.2.1.2 Common Signalling Handler (COM_BCt)............................................................................................ 18

6.2.2 UE Bearer Control Unit (UE_BCt) ............................................................................................................. 19

6.2.2.1 UE BCt User Plane Handling Function ................................................................................................. 19

6.2.2.2 Queue Status Reporting ......................................................................................................................... 20

6.2.2.3 Return Schedule Processing .................................................................................................................. 20

6.2.2.4 Transmit Burst Assembly ...................................................................................................................... 20

6.2.2.5 Bearer Transmit Buffer (Bearer_Tx) ..................................................................................................... 21

6.2.2.6 Bearer Receive Buffer (Bearer_Rx) ...................................................................................................... 21

7 Bearer Control Management (BCT-M) Behaviour ................................................................................ 21

7.1 Physical Bearer Management ........................................................................................................................... 21

7.1.1 Forward Bearer Configuration and Initial Bearer Scan .............................................................................. 21

7.1.1.0 General .................................................................................................................................................. 21

7.1.1.1 Global_Scan process ............................................................................................................................. 21

7.1.1.2 Default_Scan process ............................................................................................................................ 22

7.1.2 Forward Bearer Frequency Control within a Bearer Control ...................................................................... 22

7.1.2.1 Retuning a population of UEs ............................................................................................................... 22

ETSI

ETSI TS 102 744

2 V1.1.1 (2015

10)

7.1.2.2 Relocation of a specific UE ................................................................................................................... 22

7.1.3 Forward bearer synchronization loss .......................................................................................................... 22

7.1.4 Forward bearer Doppler Compensation (Aeronautical Class UEs only) .................................................... 23

7.1.5 Return Bearer Doppler Compensation (Aeronautical Class UE Only) ....................................................... 23

7.1.6 Return bearer frequency correction (Land-Mobile and Maritime Class UEs) ............................................ 23

7.2 System Information Broadcast Handling ......................................................................................................... 23

7.2.1 Storage of System Information ................................................................................................................... 23

7.2.2 Acquisition of System Information ............................................................................................................. 23

7.2.3 System Information Index - UE Behaviour ................................................................................................ 23

7.2.4 Wrap Around, Instances and Version Number Range ................................................................................ 26

7.3 Common Signalling (Com_BCt) Procedures ................................................................................................... 26

7.4 Connection Control Operations ........................................................................................................................ 27

7.4.0 General ........................................................................................................................................................ 27

7.4.1 Connection Set-up Operations .................................................................................................................... 27

7.4.2 Connection QoS Control ............................................................................................................................. 27

7.4.3 Connection Release Operations .................................................................................................................. 27

7.4.4 Handover Operations .................................................................................................................................. 28

7.5 Timing Control Operation ................................................................................................................................ 28

7.5.1 Principles of timing control operation ........................................................................................................ 28

7.5.2 Primary and Secondary Timing Modes ...................................................................................................... 29

7.5.3 Transition between Primary and Secondary Timing modes ....................................................................... 29

7.5.4 Aeronautical Class UE without GPS .......................................................................................................... 29

7.6 Sleep Mode Operations .................................................................................................................................... 29

8 Bearer Control User Plane (UE-BCT) Behaviour .................................................................................. 31

8.1 Ciphering Operations ....................................................................................................................................... 31

8.1.0 General ........................................................................................................................................................ 31

8.1.1 Input Parameters to the Ciphering Algorithm ............................................................................................. 32

8.1.1.1 CK ......................................................................................................................................................... 32

8.1.1.2 COUNT-C ............................................................................................................................................. 32

8.1.1.3 TBCNID ................................................................................................................................................ 33

8.1.1.4 DIRECTION ......................................................................................................................................... 33

8.1.1.5 LENGTH ............................................................................................................................................... 33

8.1.2 Initialization of Keystream Generator......................................................................................................... 33

8.1.3 Synchronization of ciphering ...................................................................................................................... 33

8.2 Queue Status Reporting .................................................................................................................................... 34

8.2.0 General ........................................................................................................................................................ 34

8.2.1 Status SDU Queue Reporting Mechanisms ................................................................................................ 34

8.2.1.0 General .................................................................................................................................................. 34

8.2.1.1 Principle of Operation ........................................................................................................................... 35

8.2.1.2 Data Status Update ................................................................................................................................ 35

8.2.1.3 Definition of QueueSize parameters sent by Connection Layer ........................................................... 36

8.2.1.4 Processing of Status Update .................................................................................................................. 36

8.2.1.5 Status SDU Generation ......................................................................................................................... 37

8.2.1.5.0 General ............................................................................................................................................ 37

8.2.1.5.1 Criterion A ....................................................................................................................................... 39

8.2.1.5.2 Criterion B ....................................................................................................................................... 40

8.2.1.6 Status SDU Control ............................................................................................................................... 42

8.2.1.6.1 Status Ack ........................................................................................................................................ 42

8.2.1.6.2 Status SDU Control Mechanisms .................................................................................................... 42

8.2.1.6.3 Status Reporting Timers .................................................................................................................. 42

8.2.2 QLen SDU Queue Status Reporting Mechanism ........................................................................................ 43

8.2.3 QRate SDU Queue Status Reporting Mechanism ....................................................................................... 44

8.3 Return Schedule Processing ............................................................................................................................. 45

8.3.1 General Concept of Operation .................................................................................................................... 45

8.3.2 Return Schedule Description ...................................................................................................................... 46

8.3.3 Position of Return Schedules ...................................................................................................................... 47

8.3.4 Dedicated Reservation Access .................................................................................................................... 49

8.3.4.1 Dedicated Return Bearer (normal) operation ........................................................................................ 49

8.3.4.2 Reserved (Unused) Slots ....................................................................................................................... 49

8.3.5 Shared Reservation Access ......................................................................................................................... 49

8.3.6 Controlled Random Access ........................................................................................................................ 51

ETSI

ETSI TS 102 744

2 V1.1.1 (2015

10)

8.3.7 Contention Access ...................................................................................................................................... 52

8.3.8 Dedicated Return Bearer (High Data Rate) operation ................................................................................ 52

8.4 Transmit Burst Assembly ................................................................................................................................. 52

8.4.0 General ........................................................................................................................................................ 52

8.4.1 Usage of Dedicated Reservation Slots ........................................................................................................ 53

8.4.1.1 Multiplexing of Data and Queue Status Reporting in Dedicated Reservations ..................................... 53

8.4.1.2 DTX Operation ..................................................................................................................................... 55

8.4.1.3 Enhanced ISDN Data Transmission ...................................................................................................... 55

8.4.2 Shared Reservation Access ......................................................................................................................... 56

8.4.2.1 Multiplexing of Data and Queue Reporting information in Shared Reservations ................................. 56

8.4.2.2 DTX operation ...................................................................................................................................... 57

8.4.3 Controlled Random Access ........................................................................................................................ 57

8.4.3.1 General Principles of operation ............................................................................................................. 57

8.4.3.1.0 Overview ......................................................................................................................................... 57

8.4.3.1.1 Initiation of transmission ................................................................................................................. 58

8.4.3.1.2 Continuation of transmission ........................................................................................................... 58

8.4.3.2 Multiplexing of Data and Queue Status Reports in Controlled Random Access .................................. 58

8.4.3.3 Untimed operation of Controlled Random Access ................................................................................ 59

8.4.4 Contention slot usage .................................................................................................................................. 59

8.4.4.1 General Principles of operation ............................................................................................................. 59

8.4.4.2 Contention Slot Usage Backoff mechanisms ........................................................................................ 59

8.4.4.3 Contention Slot Usage in Untimed Access Mode ................................................................................. 60

8.4.4.4 Queue Status Reporting in contention slots .......................................................................................... 61

8.4.4.5 Transmit_Schedule Process (Informational) ......................................................................................... 63

8.4.4.6 Create_slot Process ............................................................................................................................... 63

8.5 Return Link Adaptation .................................................................................................................................... 65

8.5.0 Overview .................................................................................................................................................... 65

8.5.1 General Principles of Operation.................................................................................................................. 65

8.5.1.0 Overview ............................................................................................................................................... 65

8.5.1.1 Basic Operation Principle ..................................................................................................................... 65

8.5.1.2 Bearer Table .......................................................................................................................................... 66

8.5.1.2.1 Bearer Table Usage ......................................................................................................................... 66

8.5.1.2.2 Extensions to Bearer Table Usage for mobile UE classes ............................................................... 68

8.5.1.2.3 Maximum Code Rate Limitations ................................................................................................... 68

8.5.2 Dedicated Reservation and Contention Access Modes ............................................................................... 68

8.5.2.1 Initial Contention Mode Access ............................................................................................................ 68

8.5.2.2 Code rate selection in transmission schedule ........................................................................................ 69

8.5.3 Shared Reservation and Controlled Random Access Mode ........................................................................ 69

8.5.3.0 General .................................................................................................................................................. 69

8.5.3.1 Shared Reservation Access ................................................................................................................... 69

8.5.3.2 Controlled Random Access Return Link Adaptation ............................................................................ 69

8.5.4 Dedicated Return Bearers (High Data Rate Operation) .............................................................................. 70

8.6 Forward Link Adaptation ................................................................................................................................. 70

8.6.1 Shared Access Forward Bearers ................................................................................................................. 70

8.6.1.1 General principles ................................................................................................................................. 70

8.6.1.2 Measuring Forward Link Quality .......................................................................................................... 70

8.6.1.3 C/No Reporting ..................................................................................................................................... 71

8.6.1.4 Code Rate Selection .............................................................................................................................. 71

8.6.1.5 Sleep Mode ........................................................................................................................................... 72

8.6.2 Variable Modulation Index Shared Access Bearers (FR80T2.5X4-5B, FR80T5X4-5B) ........................... 72

8.6.2.1 General principles ................................................................................................................................. 72

8.6.2.2 Signalling of forward link quality reports ............................................................................................. 72

8.6.3 Dedicated Forward Bearers (FR80T2.5X16/32/64, FR80T5X16/32/64).................................................... 72

8.7 Receiver Processing (Bearer_Rx) ..................................................................................................................... 73

8.8 Transmit Processing (Bearer_Tx) ..................................................................................................................... 75

8.8.0 General ........................................................................................................................................................ 75

8.8.1 Dedicated Reservation and Contention Mode Bursts ................................................................................. 75

8.8.1.1 BCtPDU Addressing mechanisms ........................................................................................................ 75

8.8.1.2 CRC generation and Burst Formatting .................................................................................................. 75

8.8.1.3 ISDN Specific Behaviour ...................................................................................................................... 75

8.8.1.4 Physical Layer Parameters .................................................................................................................... 76

8.8.2 Shared Reservation and Controlled Random Access Mode ........................................................................ 76