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ETSI TS 102 361-1 V1.4.5 (2007-12)

Technical Specification

Electromagnetic compatibility

and Radio spectrum Matters (ERM);

Digital Mobile Radio (DMR) Systems;

Part 1: DMR Air Interface (AI) protocol

ETSI

ETSI TS 102 361

1 V1.4.5 (2007

12)

Contents

Intellectual Property Rights................................................................................................................................8

Foreword.............................................................................................................................................................8

1 Scope........................................................................................................................................................9

2 References................................................................................................................................................9

2.1 Normative references .......................................................................................................................................10

3 Definitions, symbols and abbreviations .................................................................................................10

3.1 Definitions........................................................................................................................................................10

3.2 Symbols............................................................................................................................................................13

3.3 Abbreviations ...................................................................................................................................................13

4 Overview................................................................................................................................................15

4.1 Protocol architecture.........................................................................................................................................15

4.1.1 Air Interface Physical Layer (layer 1).........................................................................................................16

4.1.2 Air Interface Data Link Layer (layer 2)......................................................................................................17

4.1.3 Air Interface Call Control Layer (CCL) (layer 3).......................................................................................17

4.2 DMR TDMA structure.....................................................................................................................................17

4.2.1 Overview of burst and channel structure ....................................................................................................17

4.2.2 Burst and frame structure............................................................................................................................19

4.3 Frame synchronization .....................................................................................................................................20

4.4 Timing references.............................................................................................................................................22

4.4.1 Repeater mode BS established timing relationship.....................................................................................22

4.4.2 Repeater mode MS established timing relationship....................................................................................22

4.4.3 Direct mode timing relationship .................................................................................................................22

4.5 Common Announcement Channel (CACH).....................................................................................................23

4.6 Basic channel types ..........................................................................................................................................24

4.6.1 Traffic channel with CACH........................................................................................................................24

4.6.2 Traffic channel with guard time..................................................................................................................24

4.6.3 Bi-directional channel.................................................................................................................................25

5 Layer 2 protocol description...................................................................................................................25

5.1 Layer 2 timing ..................................................................................................................................................25

5.1.1 Channel timing relationship........................................................................................................................25

5.1.1.1 Aligned channel timing.........................................................................................................................26

5.1.1.2 Offset channel timing............................................................................................................................26

5.1.2 Voice timing ...............................................................................................................................................27

5.1.2.1 Voice superframe ..................................................................................................................................27

5.1.2.2 Voice initiation......................................................................................................................................27

5.1.2.3 Voice termination..................................................................................................................................28

5.1.3 Data timing .................................................................................................................................................28

5.1.3.1 Single slot data timing...........................................................................................................................29

5.1.3.2 Dual slot data timing.............................................................................................................................29

5.1.4 Traffic timing..............................................................................................................................................30

5.1.4.1 BS timing ..............................................................................................................................................30

5.1.4.2 Single frequency BS timing ..................................................................................................................31

5.1.4.3 Direct mode timing ...............................................................................................................................31

5.1.4.4 Time Division Duplex (TDD) timing....................................................................................................32

5.1.4.5 Continuous transmission mode .............................................................................................................32

5.1.5 Reverse Channel (RC) timing.....................................................................................................................33

5.1.5.1 Embedded outbound Reverse Channel (RC).........................................................................................33

5.1.5.2 Dedicated outbound Reverse Channel (RC) .........................................................................................34

5.1.5.3 Standalone inbound Reverse Channel (RC)..........................................................................................34

5.1.5.4 Direct mode Reverse Channel (RC)......................................................................................................35

5.2 Channel access .................................................................................................................................................35

5.2.1 Basic channel access rules ..........................................................................................................................36

5.2.1.1 Types of channel activity ......................................................................................................................36

ETSI

ETSI TS 102 361

1 V1.4.5 (2007

12)

5.2.1.2 Channel status .......................................................................................................................................37

5.2.1.3 Timing master .......................................................................................................................................37

5.2.1.4 Hang time messages and timers ............................................................................................................38

5.2.1.5 Slot 1 and 2 dependency .......................................................................................................................38

5.2.1.6 Transmit admit criteria..........................................................................................................................38

5.2.1.7 Transmission re-tries.............................................................................................................................39

5.2.2 Channel access procedure...........................................................................................................................39

5.2.2.1 Direct mode Channel Access ................................................................................................................39

5.2.2.1.1 MS Out_of_Sync Channel Access...................................................................................................40

5.2.2.1.2 MS Out_of_Sync_Channel_Monitored Channel Access.................................................................42

5.2.2.1.3 MS In_Sync_Unknown_System Channel Access ...........................................................................43

5.2.2.1.4 MS Not_in_Call Channel Access....................................................................................................44

5.2.2.1.5 MS Others_Call Channel Access ....................................................................................................44

5.2.2.1.6 MS My_Call Channel Access..........................................................................................................44

5.2.2.2 Repeater mode channel access..............................................................................................................44

5.2.2.2.1 MS Out_of_Sync Channel Access...................................................................................................44

5.2.2.2.2 MS Out_of_Sync_Channel_Monitored Channel Access.................................................................46

5.2.2.2.3 MS In_Sync_Unknown_System channel access.............................................................................47

5.2.2.2.4 MS TX_Wakeup_Message..............................................................................................................48

5.2.2.2.5 MS Not_In_Call channel access......................................................................................................49

5.2.2.2.6 MS Others_Call channel access ......................................................................................................50

5.2.2.2.7 MS My_Call channel access............................................................................................................50

5.2.2.2.8 MS In_Session channel access ........................................................................................................50

5.2.2.3 Non-time critical CSBK ACK/NACK channel access..........................................................................50

6 Layer 2 burst format...............................................................................................................................51

6.1 Vocoder socket.................................................................................................................................................52

6.2 Data and control ...............................................................................................................................................53

6.3 Common Announcement Channel burst...........................................................................................................54

6.4 Reverse Channel...............................................................................................................................................55

6.4.1 Standalone inbound Reverse Channel burst................................................................................................55

6.4.2 Outbound reverse channel (RC) burst.........................................................................................................56

7 DMR signalling......................................................................................................................................56

7.1 Link Control message structure........................................................................................................................56

7.1.1 Voice LC header.........................................................................................................................................57

7.1.2 Terminator with LC ....................................................................................................................................59

7.1.3 Embedded signalling...................................................................................................................................59

7.1.3.1 Outbound channel .................................................................................................................................60

7.1.3.2 Inbound channel....................................................................................................................................61

7.1.4 Short Link Control in CACH......................................................................................................................61

7.2 Control Signalling BlocK (CSBK) message structure......................................................................................62

7.2.1 Control Signalling BlocK (CSBK) .............................................................................................................63

7.3 Idle message.....................................................................................................................................................64

7.4 Multi Block Control (MBC) message structure................................................................................................64

7.4.1 Multi Block Control (MBC) .......................................................................................................................66

8 DMR Packet Data Protocol (PDP).........................................................................................................67

8.1 Internet Protocol...............................................................................................................................................67

8.2 Datagram fragmentation and re-assembly........................................................................................................68

8.2.1 Header block structure................................................................................................................................69

8.2.1.1 Unconfirmed data Header .....................................................................................................................70

8.2.1.2 Confirmed data header..........................................................................................................................71

8.2.1.3 Response data header............................................................................................................................71

8.2.1.4 Proprietary data header .........................................................................................................................71

8.2.1.5 Status/precoded short data header.........................................................................................................72

8.2.1.6 Raw short data header...........................................................................................................................73

8.2.1.7 Defined short data header......................................................................................................................73

8.2.1.8 Unified Data Transport (UDT) data header...........................................................................................74

8.2.2 Data block structure....................................................................................................................................74

8.2.2.1 Unconfirmed data block structure.........................................................................................................74

8.2.2.2 Confirmed data block structure.............................................................................................................77

8.2.2.3 Response packet format ........................................................................................................................80

ETSI

ETSI TS 102 361

1 V1.4.5 (2007

12)

8.2.2.4 Hang time for response packet..............................................................................................................82

8.2.2.5 Unified Data Transport (UDT) last data block structure.......................................................................82

9 Layer 2 PDU description........................................................................................................................83

9.1 PDUs for voice bursts, general data bursts and the CACH ..............................................................................84

9.1.1 Synchronization (SYNC) PDU...................................................................................................................84

9.1.2 Embedded signalling (EMB) PDU .............................................................................................................84

9.1.3 Slot Type (SLOT) PDU..............................................................................................................................85

9.1.4 TACT PDU.................................................................................................................................................85

9.1.5 Reverse Channel (RC) PDU .......................................................................................................................85

9.1.6 Full Link Control (FULL LC) PDU............................................................................................................85

9.1.7 Short Link Control (SHORT LC) PDU ......................................................................................................86

9.1.8 Control Signalling Block (CSBK) PDU .....................................................................................................86

9.1.9 Pseudo Random Fill Bit (PR FILL) PDU...................................................................................................86

9.2 Data related PDU description...........................................................................................................................86

9.2.1 Confirmed packet Header (C_HEAD) PDU...............................................................................................87

9.2.2 Rate ¾ coded packet Data (R_3_4_DATA) PDU ......................................................................................87

9.2.3 Rate ¾ coded Last Data block (R_3_4_LDATA) PDU..............................................................................87

9.2.4 Confirmed Response packet Header (C_RHEAD) PDU............................................................................88

9.2.5 Confirmed Response packet Data (C_RDATA) PDU................................................................................88

9.2.6 Unconfirmed data packet Header (U_HEAD) PDU...................................................................................89

9.2.7 Rate ½ coded packet Data (R_1_2_DATA) PDU ......................................................................................89

9.2.8 Rate ½ coded Last Data block (R_1_2_LDATA) PDU..............................................................................90

9.2.9 Proprietary Header (P_HEAD) PDU..........................................................................................................90

9.2.10 Status/Precoded short data packet Header (SP_HEAD) PDU ....................................................................91

9.2.11 Raw short data packet Header (R_HEAD) PDU ........................................................................................91

9.2.12 Defined Data short data packet Header (DD_HEAD) PDU .......................................................................92

9.2.13 Unified Data Transport Header (UDT_HEAD) PDU.................................................................................92

9.2.14 Unified Data Transport Last Data block (UDT_LDATA) PDU.................................................................92

9.2.15 Rate 1 coded packet Data (R_1_DATA) PDU ...........................................................................................93

9.2.16 Rate 1 coded Last Data block (R_1_LDATA) PDU...................................................................................93

9.3 Layer 2 information element coding ................................................................................................................93

9.3.1 Colour Code (CC).......................................................................................................................................94

9.3.2 Privacy Indicator (PI)..................................................................................................................................94

9.3.3 LC Start/Stop (LCSS).................................................................................................................................94

9.3.4 EMB parity .................................................................................................................................................94

9.3.5 Feature set ID (FID)....................................................................................................................................95

9.3.6 Data Type....................................................................................................................................................95

9.3.7 Slot Type parity ..........................................................................................................................................95

9.3.8 Access Type (AT).......................................................................................................................................96

9.3.9 TDMA Channel (TC)..................................................................................................................................96

9.3.10 Protect Flag (PF).........................................................................................................................................96

9.3.11 Full Link Control Opcode (FLCO).............................................................................................................96

9.3.12 Short Link Control Opcode (SLCO)...........................................................................................................96

9.3.13 TACT parity................................................................................................................................................97

9.3.14 RC parity.....................................................................................................................................................97

9.3.15 Group or Individual (G/I) ...........................................................................................................................97

9.3.16 Response Requested (A).............................................................................................................................97

9.3.17 Data Packet Format (DPF)..........................................................................................................................97

9.3.17A Header Compression (HC)..........................................................................................................................98

9.3.18 SAP identifier (SAP) ..................................................................................................................................98

9.3.19 Logical Link ID (LLID)..............................................................................................................................98

9.3.20 Full message flag (F) ..................................................................................................................................98

9.3.21 Blocks to Follow (BF) ................................................................................................................................98

9.3.22 Pad Octet Count (POC)...............................................................................................................................99

9.3.23 Re-Synchronize Flag (S).............................................................................................................................99

9.3.24 Send sequence number (N(S)) ....................................................................................................................99

9.3.25 Fragment Sequence Number (FSN)..........................................................................................................100

9.3.26 Data Block Serial Number (DBSN)..........................................................................................................100

9.3.27 Data block CRC (CRC-9).........................................................................................................................100

9.3.28 Class (Class) .............................................................................................................................................101

9.3.29 Type (Type)..............................................................................................................................................101

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