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

DTS/SES-00299-3-2

General Information

• Status: Published
• Publication Date: 25-Oct-2015
• Technical Committee: SES SCN - Satellite Communications and Navigation
• Current Stage: 12 - Completion
• Due Date: 25-Sep-2015
• Completion Date: 26-Oct-2015

Standards Content (Sample)

TECHNICAL SPECIFICATION
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

2 ETSI TS 102 744-3-2 V1.1.1 (2015-10)

Reference
DTS/SES-00299-3-2
Keywords
3GPP, GPRS, GSM, GSO, interface, MSS, radio,
satellite, TDM, TDMA, UMTS
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ETSI
3 ETSI TS 102 744-3-2 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 Primitive s . 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
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4 ETSI TS 102 744-3-2 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
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5 ETSI TS 102 744-3-2 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
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6 ETSI TS 102 744-3-2 V1.1.1 (2015-10)
8.8.2.1 Addressing mechanisms . 76
8.8.2.2 CRC generation and Burst Formatting . 76
8.8.2.3 Continuation Burst signalling. 76
8.8.2.4 CW Acquisition sequence generation . 76
8.8.2.5 Physical Layer Parameters . 76
8.8.2.5.0 General . 76
8.8.2.5.1 Frequency Offsets . 77
8.8.2.5.2 Transmit Power Levels . 77
8.8.2.5.3 Timing Offsets . 77
9 Timing And Frequency Offset Operations . 77
9.1 GPS Operations . 77
9.1.0 General . 77
9.1.1 GPS Ephemeris information . 78
9.2 Doppler Frequency Compensation (Aeronautical UE Classes) . 78
9.3 Timing Offset Calculations . 79
9.3.1 Return Channel Timing Control in the RNC . 79
9.3.1.0 General . 79
9.3.1.1 Satellite State Vector management . 79
9.3.1.2 State Vector Signalling . 79
9.3.1.3 Satellite State Vector Formatting . 80
9.3.1.4 Estimated Time Of Arrival Determination . 81
9.3.1.5 UE Timing Offset Management . 82
9.3.1.6 Beam Parameters . 82
9.4 UE Return Channel Timing Operations . 83
9.4.0 General . 83
9.4.1 Variable definitions. 83
9.4.2 Entry: (PROCESS) . 84
9.4.3 UEPOS_Sync: (PROCESS) . 84
9.4.4 NO_UEPOS_Sync: (PROCESS) . 85
9.4.5 UEPOS_Available: (PROCESS) . 85
9.4.6 NO_UEPOS: (PROCESS) . 86
9.4.7 State_Vector_Update: (PARALLEL PROCESS) . 87
9.4.8 RNC_SID_Update: (PARALLEL PROCESS) . 87
9.4.9 Elapsed_Time_Monitor: (PARALLEL PROCESS) . 88
9.4.10 Beam_Delay_Range_Update: (PARALLEL PROCESS) . 88
9.4.11 Get_UEPOS (FUNCTION) . 88
9.4.12 Calc_SID_UEPOS (FUNCTION) . 90
9.4.13 Check_SID_Calc (FUNCTION) . 91
9.4.14 Do_RACH (FUNCTION) . 92
9.4.15 Wait_RNC_Resp (FUNCTION) . 92
9.4.16 Check_RNC_Resp (FUNCTION) . 92
9.4.17 Calc_Req_Con_Slots (FUNCTION) . 93
Annex A (informative): Process Variables And Objects . 94
A.1 Bearer Control Constants . 94
A.2 Connection Related Parameters . 94
A.3 Process Constants and Variables . 96
History . 98

ETSI
7 ETSI TS 102 744-3-2 V1.1.1 (2015-10)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://ipr.etsi.org).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Satellite Earth Stations and
Systems (SES).
The present document is part 3, sub-part 2 of a multi-part deliverable. Full details of the entire series can be found in
ETSI TS 102 744-1-1 [i.1].
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
This multi-part deliverable (Release 1) defines a satellite radio interface that provides UMTS services to users of mobile
terminals via geostationary (GEO) satellites in the frequency range 1 518,000 MHz to 1 559,000 MHz (downlink) and
1 626,500 MHz to 1 660,500 MHz and 1 668,000 MHz to 1 675,000 MHz (uplink).
ETSI
8 ETSI TS 102 744-3-2 V1.1.1 (2015-10)
1 Scope
The present document defines the Bearer Control Layer (BCt) operation of the Family SL satellite radio interface
between the Radio Network Controller (RNC) and the User Equipment (UE) used in the satellite network. The Bearer
Control Layer (BCt) peer-to-peer interface is described in ETSI TS 102 744-3-1 [8].
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 133 102: "Universal Mobile Telecommunications System (UMTS); 3G security; Security
architecture (3GPP TS 33.102 Release 4)".
[2] ETSI TS 133 105: "Universal Mobile Telecommunications System (UMTS); Cryptographic
algorithm requirements (3GPP TS 33.105 Release 4)".
[3] ETSI TS 135 201: "Universal Mobile Telecommunications System (UMTS); Specification of the
3GPP confidentiality and integrity algorithms; Document 1: f8 and f9 specifications
(3GPP TS 35.201 Release 4)".
[4] ETSI TS 102 744-1-3: "Satellite Earth Stations and Systems (SES); Family SL Satellite Radio
Interface (Release 1); Part 1: General Specifications; Sub-part 3: Satellite Radio Interface
Overview".
[5] ETSI TS 102 744-1-4: "Satellite Earth Stations and Systems (SES); Family SL Satellite Radio
Interface (Release 1); Part 1: General Specifications; Sub-part 4: Applicable External
Specifications, Symbols and Abbreviations".
[6] ETSI TS 102 744-2-1: "Satellite Earth Stations and Systems (SES); Family SL Satellite Radio
Interface (Release 1); Part 2: Physical Layer Specifications; Sub-part 1: Physical Layer Interface".
[7] ETSI TS 102 744-2-2: "Satellite Earth Stations and Systems (SES); Family SL Satellite Radio
Interface (Release 1); Part 2: Physical Layer Specifications; Sub-part 2: Radio Transmission and
Reception".
[8] ETSI TS 102 744-3-1: "Satellite Earth Stations and Systems (SES); Family SL Satellite Radio
Interface (Release 1); Part 3: Control Plane and User Plane Specifications; Sub-part 1: Bearer
Control Layer Interface".
[9] ETSI TS 102 744-3-4: "Satellite Earth Stations and Systems (SES); Family SL Satellite Radio
Inter Part 3: Control Plane and User Plane Specifications; Sub-part 4: Bearer Connection Layer
Operation".
[10] ETSI TS 102 744-3-9: "Satellite Earth Stations and Systems (SES); Family SL Satellite Radio
Interface (Release 1); Part 3: Control Plane and User Plane Specifications; Sub-part 9: Initiation
and Operation of User Plane".
[11] ETSI TS 102 744-3-3: "Satellite Earth Stations and Systems (SES); Family SL Satellite Radio
Interface (Release 1); Part 3: Control Plane and User Plane Specifications; Sub-part 3: Bearer
Connection Layer Interface".
ETSI
9 ETSI TS 102 744-3-2 V1.1.1 (2015-10)
[12] ETSI TS 102 744-3-5: "Satellite Earth Stations and Systems (SES); Family SL Satellite Radio
Interface (Release 1); Part 3: Control Plane and User Plane Specifications; Sub-part 5: Adaptation
Layer Interface".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI TS 102 744-1-1: "Satellite Earth Stations and Systems (SES); Family SL Satellite Radio
Interface (Release 1); Part 1: General Specifications; Sub-part 1: Services and Architectures".
3 Symbols and abbreviations
3.1 Symbols
For the purposes of the present document, the symbols given in ETSI TS 102 744-1-4 [5], clause 3 apply.
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in ETSI TS 102 744-1-4 [5], clause 3 apply.
4 General Architecture
The Bearer Control Layer (BCt) provides medium access control functionality for both the control and user planes.
Figure 4.1 illustrates the position of the Bearer Control Layer within the Family SL air interface protocol stack. An
overview of the radio interface layering and relationship to the Bearer Control Layer is provided in ETSI
TS 102 744-1-3 [4], clause 4 and ETSI TS 102 744-3-1 [8], clause 4. An overview of the Bearer Control Layer
operation is provided in ETSI TS 102 744-1-3 [4], clause 7.
ETSI
10 ETSI TS 102 744-3-2 V1.1.1 (2015-10)

Figure 4.1: Bearer Control Layer Position in Protocol Stack (Control Plane Illustrated)
The Bearer Control Layer is responsible for the management and set-up of physical bearers. Its operations include:
• Transfer of data over one or more forward and return physical bearers (each RNC supports multiple forward
and return physical bearers)
• Transfer of data to and from UEs where each UE may have multiple simultaneous data connections each with
its own QoS requirements
• Dynamic switching of UE between different forward and return bearers
• Handover of connections to/from other Bearer Control entities for mobility management purposes without the
need to close and restart connections
• Reconfiguration of connection QoS during the life-time of a connection (supported by Bearer Control layer on
Qo
...