SIST EN 300 396-3 V1.2.1:2006

• Abstract:

  The multi-part deliverable EN 300 396 defines the TErrestrial Trunked RAdio (TETRA) Direct Mode Operation (DMO). It specifies the basic air interface, the inter-working between Direct Mode (DM) groups via repeaters, and inter-working with the TETRA Voice plus Data (V+D) system via gateways. It also specifies the security aspects in TETRA DMO, and the intrinsic services that are supported in addition to the basic bearer and teleservices. The present document applies to the TETRA DMO Mobile Station - Mobile Station (MS-MS) air interface and contains the specifications of the Data Link Layer (DLL) and the network layer according to the ISO model. It establishes the services, messages and protocols used for voice and circuit mode data calls and short data transfer, starting with the upper layers:; - it defines and specifies the protocol used by the layer 3 entity to communicate across the air interface;; - it defines and specifies the services and protocol used in the DLL.; The normative annexes mainly specify the parameter values used in the protocol.

• Status: Published
• Publication Date: 31-Mar-2006
• ICS: 33.070.10 - Terrestrial Trunked Radio (TETRA)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2006
• Due Date: 01-Apr-2006
• Completion Date: 01-Apr-2006
• Ref Project: ETSI EN 300 396-3 V1.2.1 (2004-12) - Terrestrial Trunked Radio (TETRA); Technical requirements for Direct Mode Operation (DMO); Part 3: Mobile Station to Mobile Station (MS-MS) Air Interface (AI) protocol

SIST EN 300 396-3 V1.2.1:2006 is the Slovenian adoption of ETSI EN 300 396-3 V1.2.1 for Terrestrial Trunked Radio (TETRA) Direct Mode Operation (DMO). It specifies the Mobile Station to Mobile Station (MS-MS) air interface protocol, including the Data Link Layer (DLL) and the network-layer procedures used for voice, circuit mode data and short data transfer in direct communication without an intervening base station. It is intended for people who implement, test, buy or approve TETRA terminals and need to know how direct MS-to-MS operation is signalled and controlled.

What does SIST EN 300 396-3 V1.2.1:2006 specify?

SIST EN 300 396-3 V1.2.1:2006 specifies the MS-MS air interface for TETRA DMO. It focuses on how two or more mobile stations set up calls, exchange traffic and short data, monitor the channel, and use the Data Link Layer and DMCC functions on the air interface.

The standard sits inside the EN 300 396 multi-part deliverable for TETRA DMO. That wider deliverable covers the basic air interface, interworking through repeaters and gateways, security aspects, and intrinsic services. This part is the piece that applies to direct MS-MS operation.

The document is organised into clauses for scope, references, definitions and abbreviations, protocol overview, Layer 3 service and protocol, Layer 2 service and protocol, PDU descriptions, and annexes. The annexes provide protocol parameters, the FCS definition, Dual Watch limitations, threshold guidance for channel surveillance, and SDS-TL use in DMO.

Annex	What it covers
Annex A	Layer 3 timers and constants, Layer 2 timers and constants, and the maximum number of frame transmissions by DM-MAC
Annex B	Mathematical definition of the Frame Check Sequence (FCS)
Annex C	Limitations of Dual Watch operation
Annex D	Use of threshold in channel surveillance procedures
Annex E	SDS-TL use in DMO

What are the key requirements of SIST EN 300 396-3 V1.2.1:2006?

The standard defines how TETRA DMO terminal software and air-interface procedures work together. For implementers, the key point is that it specifies both the signalling steps and the protocol data structures needed for interoperable direct radio operation.

Channel structure and call states

SIST EN 300 396-3 V1.2.1:2006 defines a DM channel as the time-slot grouping used on a DM RF carrier, with channel A in normal operation and channel A plus channel B in frequency efficient mode. Clause 4 describes the states free, occupied, reserved and unknown, which are the basis for deciding whether a station may call, join, wait or pre-empt. In practice, equipment must monitor the channel state before sending setup or traffic, or it may clash with another call.

Clause 4 also distinguishes DSB, DNB and the timing used for occupied and reserved channels. That matters because the master DM-MS uses those burst types to signal control information and traffic in a defined frame structure.

Call control services at Layer 3

Clause 5 defines the DMCC-SAP services that the user application can request. These include individual and group circuit mode call transmission and reception in simplex mode, call set-up with or without presence check, clear and encrypted circuit mode operation, pre-emption, and user-defined or pre-defined short data message transfer.

For a buyer or designer, this clause shows what terminal behaviour is expected at the application interface. If a product claims support for direct calls or short data, its control software must provide these service primitives and their parameters in the DMCC model.

Circuit mode call procedures

Clause 6 describes how circuit mode calls are set up, changed over, pre-empted and released. Individual calls can use call set-up with or without presence check, while group calls use call set-up without presence check. The procedures also cover late entry, occupation, reservation and the transfer of the master role between DM-MSs.

The pre-emption procedures are important for high-priority use. Clause 6 allows a DM-MS that is not part of the ongoing call to take over the channel for a new call when pre-emption is valid, and it also covers pre-emption during occupation or reservation. In practice, implementers need to handle the release of the old call, the new master role, and any associated timing adjustment.

Short Data Service (SDS)

Clause 6.3 defines SDS for user-defined short messages and predefined status messages. It supports unacknowledged service for group use and acknowledged service for individual use, and it covers sending, receiving, additional addressing, extended error protection, and SDS-TL use in DMO.

This matters because short data can be sent on a free channel, by pre-emption, during circuit mode transmission, or as a transaction within a circuit mode call. The standard also describes how retries, acknowledgements and report handling are managed, so terminal behaviour is not left to local interpretation.

Layer 2 service and MAC behaviour

Clause 7 defines the layer 2 service access points, including DMA-SAP, DMC-SAP and DMD-SAP. The DMA-UNITDATA primitive carries the DM-SDU plus fields such as destination and source addressing, message type, communication type, encryption state, priority, reservation information and repeat count.

Clause 8 then defines the MAC structure and the logical channels. It maps SCH/S, SCH/H, SCH/F, STCH, TCH and LCH to the physical burst types DSB, DNB and DLB, and it describes upper and lower MAC functions, scrambling, error detection, fragmentation, random access and traffic-mode operation. In practice, this is the part that controls how frames are placed on the air interface and how the terminal shares the channel with other users.

Protocol data units and coded fields

Clause 9 gives the PDU descriptions for Layer 2 and Layer 3, including DMAC-SYNC, DMAC-DATA, DMAC-FRAG, DMAC-END, DMAC-U-SIGNAL and DMAC-TRAFFIC. It also defines the coded information elements used in the messages, such as addressing, encryption state, frame countdown, message type, number of SCH/F slots and short data fields.

For an implementer, clause 9 is where the bit-level encoding rules are located. That is the part used for software development, interoperability testing and protocol conformance work.

What terms does SIST EN 300 396-3 V1.2.1:2006 define?

• Call - A complete sequence of related call transactions between DM-MSs, either between two stations or among several stations in a group call.
• DM channel - The grouping of time slots on a DM RF carrier used for a particular DMO call.
• Direct Mode Service Centre (DM-SC) - The entity that implements DM store-and-forward functions.
• DUal Mode switchable Mobile Station (DU-MS) - A mobile station that can operate in TETRA DMO or TETRA TMO, one mode at a time.
• Pre-emption - The transfer of the master role to the requesting DM-MS.
• Presence signal - A message sent by a DM-REP or DM-GATEway to indicate its presence on an RF carrier.
• Data Link Layer (DLL) - The layer that handles medium sharing and separates user-plane traffic from control-plane signalling in DMO.

Who uses SIST EN 300 396-3 V1.2.1:2006?

TETRA terminal designers use this standard to implement the MS-MS air interface, the DMCC procedures and the MAC behaviour in a radio product. They need it when defining channel access, call control, SDS handling, encryption-related signalling and burst formatting.

Test laboratories and certification teams use it to verify conformance of direct mode call setup, pre-emption, short data exchange, channel surveillance and protocol encoding. It is also relevant to system integrators and technical buyers who need to compare terminal functions against a common TETRA DMO protocol model.

Operators and organisations that use TETRA terminals in direct communication use it to understand what a terminal should do when no base station is involved. For them, the practical value is knowing how calls behave when the channel is free, occupied, reserved or subject to changeover or pre-emption.

Which standards are used with SIST EN 300 396-3 V1.2.1:2006?

• ETS 300 396-1 - Gives the general DMO architecture and the overall layer overview.
• EN 300 396-2 - Provides the DSB structure used for call setup signalling.
• EN 300 396-4 - Is cited with SYNC PDU type definitions related to DMO synchronisation.
• ETS 300 396-5 - Supports gateway and repeater-related communication types and SYNC PDU definitions.
• EN 300 396-6 - Provides security criteria used when checking pre-emption requests.
• EN 300 396-7 - Is cited with SYNC PDU type definitions related to DMO synchronisation.
• EN 300 396-10 - Is cited with SYNC PDU type definitions related to DMO synchronisation.
• EN 300 392-2 - Provides the status number definitions and related TETRA numbering and protocol references.
• ETS 300 396-3 - The earlier edition of the same part is cited in the reference list.

What does the SIST EN 300 396-3 V1.2.1:2006 document contain?

SIST EN 300 396-3 V1.2.1:2006 contains service descriptions, state diagrams, procedure sequences, primitive parameter tables and detailed PDU coding rules for MS-MS DMO. It also contains MAC and channel-surveillance procedures, traffic-mode behaviour, and the rules for fragmentation, repetition, random access and encryption-related signalling.

The document includes tables for DMCC and layer 2 primitives, figures for call setup, changeover, pre-emption and SDS transfer, and detailed element-coding tables for the information carried in PDUs. Those are the parts used when writing terminal software and when checking whether two implementations will interoperate on the air interface.

Annex A collects timers and constants, Annex B defines the FCS mathematically, Annex C discusses practical limitations of Dual Watch operation, Annex D gives guidance on threshold use in channel surveillance, and Annex E defines SDS-TL use in DMO.

SLOVENSKI STANDARD
01-april-2006
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Terrestrial Trunked Radio (TETRA); Technical requirements for Direct Mode Operation
(DMO); Part 3: Mobile Station to Mobile Station (MS-MS) Air Interface (AI) protocol
Ta slovenski standard je istoveten z: EN 300 396-3 Version 1.2.1
ICS:
33.070.10 Prizemni snopovni radio Terrestrial Trunked Radio
(TETRA) (TETRA)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

European Standard (Telecommunications series)

Terrestrial Trunked Radio (TETRA);
Technical requirements for Direct Mode Operation (DMO);
Part 3: Mobile Station to Mobile Station (MS-MS)
Air Interface (AI) protocol
2 ETSI EN 300 396-3 V1.2.1 (2004-12)

Reference
REN/TETRA-08064
Keywords
air interface, protocol, radio, TETRA
ETSI
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ETSI
3 ETSI EN 300 396-3 V1.2.1 (2004-12)
Contents
Intellectual Property Rights.11
Foreword.11
1 Scope.12
2 References.12
3 Definitions and abbreviations.13
3.1 Definitions.13
3.2 Abbreviations.15
4 Overview of protocol.17
4.1 General.17
4.2 The DM channel.17
4.3 DM call procedures .18
4.3.1 Constraints on the frame structure .19
4.3.2 Setting up a call .19
4.3.2.1 Call set-up without presence check.19
4.3.2.1.1 Basic procedure.19
4.3.2.1.2 Procedure in frequency efficient mode.20
4.3.2.2 Call set-up with presence check .21
4.3.3 Changeover in a call .21
4.3.4 Pre-emption of a DM call .22
4.3.5 Terminating a call .23
4.3.6 DM short data call .23
4.3.6.1 Unacknowledged short data message.23
4.3.6.2 Acknowledged short data message .24
4.4 DM protocol layering .24
5 Layer 3 service description.25
5.1 Introduction.25
5.2 Services offered.25
5.3 Primitive description.26
5.3.1 DMCC-COMPLETE primitive.26
5.3.2 DMCC-RELEASE primitive.27
5.3.3 DMCC-REPORT primitive.27
5.3.4 DMCC-SDS DATA primitive .27
5.3.5 DMCC-SDS REPORT primitive.28
5.3.6 DMCC-SDS UNITDATA primitive.28
5.3.7 DMCC-SETUP primitive.29
5.3.8 DMCC-TPNI primitive.30
5.3.9 DMCC-TX CEASED primitive.30
5.4 Parameter description.30
5.5 States for DMCC-SAP.35
6 Layer 3 protocol .36
6.1 Introduction.36
6.1.1 DMCC protocol states .36
6.1.1.1 IDLE.36
6.1.1.2 CALL SETUP NORMAL ORIGINATING.36
6.1.1.3 CALL SETUP NORMAL TERMINATING .36
6.1.1.4 CALL SETUP PRES_CHECK ORIGINATING.36
6.1.1.5 CALL SETUP PRES_CHECK TERMINATING.36
6.1.1.6 PRE-EMPTION.36
6.1.1.7 CALL ACTIVE TX OCCUPATION.36
6.1.1.8 CALL ACTIVE TX RESERVATION.37
6.1.1.9 CALL ACTIVE RX OCCUPATION.37
6.1.1.10 CALL ACTIVE RX RESERVATION.37
6.1.1.11 WAIT RSP OCCUPATION .37
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4 ETSI EN 300 396-3 V1.2.1 (2004-12)
6.1.1.12 WAIT RSP RESERVATION.37
6.1.1.13 ACK'D SHORT DATA INITIATED.37
6.1.1.14 UNACK'D SHORT DATA INITIATED.37
6.2 Circuit mode calls.37
6.2.1 Procedures for call set-up without presence check .38
6.2.1.1 Outgoing call.38
6.2.1.2 Incoming call.40
6.2.1.3 Temporary group address.41
6.2.2 Procedures for call set-up with presence check .41
6.2.2.1 Outgoing call.41
6.2.2.2 Incoming call.43
6.2.3 Usage of DM-OCCUPIED PDU .44
6.2.3.1 Sending of DM-OCCUPIED PDU by master DM-MS.44
6.2.3.2 Late entry by slave DM-MS.44
6.2.4 Procedures during occupation.44
6.2.4.1 Master DM-MS.44
6.2.4.2 Slave DM-MS.45
6.2.4.3 Transmitting Party Number Identification (TPNI).47
6.2.5 Procedures during reservation.47
6.2.5.1 Master DM-MS.47
6.2.5.2 Slave DM-MS.49
6.2.5.3 Pre-emption of short data sent as a transaction within a circuit mode call.51
6.2.6 Procedures to set up a new call by pre-emption.51
6.3 Short Data Service (SDS) procedures .52
6.3.1 Sending short data.53
6.3.1.1 Sending short data on a free channel.53
6.3.1.1.1 Sending unacknowledged short data on a free channel .53
6.3.1.1.2 Sending acknowledged short data on a free channel .55
6.3.1.2 Sending short data by pre-emption.57
6.3.1.3 Sending short data during circuit mode transmission.58
6.3.1.4 Sending short data as a transaction within a circuit mode call.59
6.3.1.4.1 Pre-emption to send short data as a transaction within a circuit mode call .59
6.3.1.4.2 Changeover to send short data as a transaction within a circuit mode call.60
6.3.1.4.3 Sending the short data as master of the circuit mode call.60
6.3.2 Receiving short data.60
6.3.2.1 Receiving unacknowledged short data.60
6.3.2.2 Receiving acknowledged short data.61
6.3.3 Additional addressing.61
6.3.4 Extended error protection .61
6.3.5 SDS-TL service in DMO .62
6.3.5.1 Service primitives at the DMTL-SDS-SAP .62
6.3.5.2 DMTL-SDS primitives' parameters .65
6.3.5.3 DMTL-SDS PDUs.67
6.3.5.4 DMTL-SDS procedures.67
6.4 Usage of DMA-UNITDATA primitive.70
7 Layer 2 service description.71
7.1 Introduction.71
7.2 Layer 2 architecture.72
7.2.1 Lower layer management in layer 2.73
7.3 Service descriptions.73
7.3.1 Services at the DMA-SAP .73
7.3.1.1 Services provided to layer 3.73
7.3.1.2 Service primitives at the DMA-SAP .74
7.3.1.2.1 DMA-REPORT primitive.74
7.3.1.2.2 DMA-UNITDATA primitive.74
7.3.2 Services at the DMC-SAP .75
7.3.2.1 Services provided to layer 3.75
7.3.2.2 Service primitives at the DMC-SAP .75
7.3.2.2.1 DMC-CONFIGURE primitive.76
7.3.2.2.2 DMC-REPORT primitive.76
7.3.3 Services at the DMD-SAP .76
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5 ETSI EN 300 396-3 V1.2.1 (2004-12)
7.3.3.1 Services provided to the U-plane application.76
7.3.3.2 Service primitives at the DMD-SAP .76
7.3.3.2.1 DMD-REPORT primitive.77
7.3.3.2.2 DMD-UNITDATA primitive.77
7.4 Parameter listing.77
7.4.1 Air interface encryption information .77
7.4.2 Air interface encryption state.77
7.4.2A Called party in ongoing call.78
7.4.3 Call release.78
7.4.4 Call set-up after pre-emption or changeover.78
7.4.5 Changeover request held during occupation.78
7.4.5A Channel selection information .78
7.4.6 Circuit mode information.78
7.4.7 Circuit mode type.78
7.4.8 Communication type.78
7.4.9 Destination address.78
7.4.10 Destination address type .79
7.4.10A DM channel.79
7.4.11 DM-SDU.79
7.4.12 DM-SDU length.79
7.4.12A Dual watch information.79
7.4.13 FCS flag.79
7.4.14 Half slot condition .79
7.4.15 Half slot content.79
7.4.16 Half slot importance.79
7.4.17 Half slot position.79
7.4.18 Half slot synchronization .80
7.4.19 Handle to the request .80
7.4.20 Immediate retransmission.80
7.4.21 Incomplete DM-SDS DATA/ACK received .80
7.4.21A Lower layer quality information .80
7.4.21B Master of ongoing call .80
7.4.22 Message type.80
7.4.23 New call pre-emption.80
7.4.24 Number of repeats.81
7.4.25 Priority.81
7.4.26 Priority of ongoing call .81
7.4.27 Recent user changeover request.81
7.4.28 Recent user priority.81
7.4.29 Report.81
7.4.30 Reservation time.81
7.4.31 SDS transaction type.81
7.4.32 Source address.81
7.4.33 Source address type .81
7.4.34 Stealing priority.82
7.4.35 Stolen indication.82
7.4.36 Type of pre-emption .82
7.4.37 Valid addresses.82
8 Layer 2 protocol .82
8.1 Introduction.82
8.1.1 Functions of lower MAC .82
8.1.2 Functions of upper MAC .83
8.2 Interface between lower and upper MAC.83
8.2.1 Logical channels defined at the DMV-SAP.83
8.2.2 Service primitives at the DMV-SAP.84
8.2.3 PDU mapping of the logical channels at the DMV-SAP.85
8.2.4 Scrambling mechanism.86
8.2.5 PDU error detection.86
8.2.6 Modes of operation .87
8.2.6.1 DM-MS modes of operation .87
8.2.6.1.1 Idle mode.87
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6 ETSI EN 300 396-3 V1.2.1 (2004-12)
8.2.6.1.2 Signalling mode.87
8.2.6.1.3 Traffic mode.87
8.2.6.2 Operation in traffic mode .88
8.2.6.2.1 Traffic transmission.88
8.2.6.2.2 Stealing mechanism.89
8.2.6.3 Selection of the mode of operation .89
8.3 Basic capabilities of the Physical Layer (PL).90
8.3.1 DM-MS capabilities.90
8.3.1.1 DM only and dual mode capable MS operation.90
8.3.1.2 Dual watch capable MS operation .91
8.3.1.2.1 Full Dual Watch Mobile Station (F-DW-MS).91
8.3.1.2.2 Idle Dual Watch Mobile Station (I-DW-MS) .91
8.4 Usage of DM channel.91
8.4.1 Definition of DM channel.91
8.4.1.1 DM channel arrangement.91
8.4.1.2 DM channel A operation.91
8.4.1.3 DM channel B operation .92
8.4.2 DM-MAC states.93
8.4.2.1 DM-MAC state definitions .93
8.4.2.2 DM-MS channel surveillance procedures .94
8.4.2.2.1 Initial determination of DM channel state .94
8.4.2.2.2 Fast call set-up surveillance in idle mode.96
8.4.2.2.3 DM-MS channel surveillance at call set-up.99
8.4.2.3 Master DM-MS channel maintenance procedures during a call .101
8.4.2.4 Slave DM-MS channel maintenance procedures during a call.101
8.4.2.4.1 Slave MS channel maintenance during call transaction .102
8.4.2.4.2 Slave MS signal quality measurement during call transaction .102
8.4.2.4.3 Slave MS channel maintenance during reservation .102
8.4.2.5 Additional master MS procedures in frequency efficient mode.102
8.4.2.5.1 Channel A master MS procedures .103
8.4.2.5.2 Channel B master MS procedures .103
8.4.3 Criteria for changing DM-MAC state.103
8.4.3.1 Criteria for changing DM-MAC state for master DM-MS.103
8.4.3.2 Criteria for changing DM-MAC state for slave DM-MS.104
8.4.3.3 Criteria for changing DM-MAC state for idle DM-MS .105
8.4.4 DM-MS channel monitoring procedures .107
8.4.4.1 DM channel during call set-up with presence check.108
8.4.4.2 DM channel in occupation during a circuit mode call.108
8.4.4.3 DM channel in reservation during a circuit mode call .108
8.4.4.4 DM channel in occupation during an SDS call .108
8.4.4.5 DM channel usage during pre-emption signalling .109
8.4.4.6 DM channel usage during timing change request signalling.109
8.4.5 Transmission of layer 3 messages by DM-MAC.109
8.4.5.1 Transmission of C-plane messages by DM-MAC.109
8.4.5.1.1 Transmitting DM-SETUP.109
8.4.5.1.2 Transmitting DM-SETUP PRES.110
8.4.5.1.3 Transmitting DM-CONNECT.111
8.4.5.1.4 Transmitting DM-DISCONNECT.111
8.4.5.1.5 Transmitting DM-CONNECT ACK.111
8.4.5.1.6 Transmitting DM-RELEASE.111
8.4.5.1.7 Transmitting DM-OCCUPIED.112
8.4.5.1.8 Transmitting DM-TX CEASED.112
8.4.5.1.9 Transmitting DM-TX REQUEST.113
8.4.5.1.10 Transmitting response to DM-TX REQUEST.113
8.4.5.1.11 Transmitting DM-PREEMPT.114
8.4.5.1.12 Transmitting response to DM-PREEMPT.114
8.4.5.1.13 Transmitting DM-SDS UDATA and DM-SDS DATA.115
8.4.5.1.14 Transmitting response to DM-SDS DATA .116
8.4.5.1.15 Transmitting DM-INFO.116
8.4.5.2 Transmission of U-plane messages by DM-MAC .116
8.4.6 Transmission of layer 2 messages generated by DM-MAC .116
8.4.6.1 Transmitting DM-RESERVED.117
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8.4.6.2 Transmitting DM-SDS OCCUPIED .117
8.4.6.3 Transmitting DM-TIMING REQUEST .118
8.4.6.4 Transmitting DM-TIMING ACK.118
8.4.7 General DM-MAC procedures .118
8.4.7.1 DM-MAC repeat transmissions .118
8.4.7.2 DM-MAC frame countdown procedure.118
8.4.7.3 Use of timers .119
8.4.7.4 Linearization.119
8.4.7.5 Fragmentation.119
8.4.7.6 Fill bit indication.119
8.4.7.7 Selection of pseudo address .119
8.4.7.8 Slot flag indication .120
8.4.7.9 Requests bitmap.120
8.4.7.10 DM aspects of dual watch operation .120
8.4.7.10.1 Full and idle dual watch operation.120
8.4.7.10.2 DM aspects of full dual watch operation.120
8.4.7.10.3 DM aspects of idle dual watch operation .124
8.4.7.11 Air interface encryption .126
8.4.7.12 Channel A or B operation .126
8.4.7.13 Sending short data as a transaction within a circuit mode call.126
8.4.7.14 SDS time remaining .127
8.4.7.15 Timing change procedure.127
8.4.7.16 Timing change at changeover or pre-emption.129
8.5 MAC procedures for transfer of signalling messages.129
8.5.1 Formation of MAC PDU .129
8.5.2 Addressing.130
8.5.2.1 Transmission of message.130
8.5.2.1.1 Addressing in synchronization burst .130
8.5.2.1.2 Addressing in normal burst.132
8.5.2.2 Reception of message.132
8.5.3 Use of air interface encryption.133
8.5.4 Fragmentation and reconstruction.134
8.5.4.1 Fragmentation.134
8.5.4.2 Reconstruction.135
8.5.5 Fill bit addition and deletion.136
8.5.5.1 Fill bit addition.136
8.5.5
...