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1. Contents 1. Contents 2. Purpose

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0 NXDNTM Specification Overview Level 1
Version 1.2 Issued : January 19, 2012 JVC KENWOOD Corporation Icom Incorporated Note : NXDN is the trademark of JVC KENWOOD Corporation and Icom Incorporated.

1 1. Contents 1. Contents 2. Purpose
3. Copyright and Intellectual Property 4. Use Disclaimer 5. Scope of this Document 6. Items Discussed 7. NXDNTM Compliance Certification 8. Revision Record for this Document P.1 P.2 P.3 P.4 P.5 P.6 ~35 P.36 P.37

2 2. Purpose This document provides a brief overview of the NXDNTM common air interface protocol and call features related to the supporting IP network systems which are shared under a technology and cooperative development agreement between JVC KENWOOD Corporation and Icom Incorporated. The contents of this document are disclosed without limitation for the purpose of expanding NXDNTM with interested parties.

3 3. Copyright and Intellectual Property
This document and its contents are copyright protected and are the property of JVC KENWOOD Corporation and Icom Incorporated. Certain technologies discussed in this document are the intellectual property of JVC KENWOOD Corporation and/or Icom Incorporated. Use of any intellectual property contained in this document is not permitted unless authorized by JVC KENWOOD Corporation or Icom Incorporated.

4 4. Use Disclaimer Alterations or deletions of any item in this document may be done without obligation of any prior notice provided no agreement to the contrary exists between JVC KENWOOD Corporation and Icom Incorporated and the party this document is disclosed to. If the receiving party sustains tangible or intangible damages from the use or consideration of use of the contents, including any subsequent alterations or deletions, neither JVC KENWOOD Corporation or Icom Incorporated shall be held liable and accountable for any compensation for said damages.

5 5. Scope of this Document A brief overview of the specifications pertaining to: a) Wireless communication systems for the Americas’ private land mobile markets in the VHF, UHF and 800MHz frequency bands and, b) the FDMA method for 6.25kHz or 12.5kHz bandwidth and, c) the system using this communication protocol

6 6. Items Discussed The following items are specified in this document.
6-1 Defined Services Voice Call Services (Group, Individual, etc.) Data Call Services (Long Data, Short Data, etc.) Supplemental Services (Status Call, Emergency, Encryption, etc.) Trunked System Services (Registration, Roaming, etc.) 6-2 Conventional System 6-3 Trunked System 6-4 Channel Parameters 6-5 Vocoder 6-6 Concept of Channel Definition (Conv. & Type-C) Frame Structure Concept Voice Frame Structure (Conv. & Type-C) Data Frame Structure (Conv. & Type-C) Control Channel Frame Structure (Type-C) Random Access on Control Channel (Type-C) Link Time of Group Call (Type-C) 6-7 Concept of Channel Definition (Type-D) Voice Frame Structure (Type-D) Data Frame Structure (Type-D) Link Establishment Frame Structure (Type-D) Link Time of Group Call on Home Repeater (Type-D) "Conv.": Conventional "Type-C": Type-C Trunking "Type-D": Type-D Trunking

7 6-1-1. Defined Services in Conventional System
Direct via Repeater Voice Service Unaddressed Voice Call (using RAN) Mandatory Group Voice Call Std. Option Individual Voice Call Interconnect Voice Call n/a Data Service Data Call (Group, Individual) Short Data Call (on Control Channel) Simultaneous Data Call Supplementary Status Call Emergency Call & Alert Remote Control (Stun, etc.) ESN Validation Late Entry Encryption Mandatory : Mandatory Service Std. Option : Standard Option Service

8 6-1-2. Defined Services in Trunked System
Type-C Type-D Multi Site Single Site Voice Service Group Voice Call Mandatory Individual Voice Call Interconnect Voice Call Std. Option Data Service Data Call (Group, Individual) Short Data Call (on Control Channel) n/a Simultaneous Data Call Supplementary Status Call Emergency Call & Alert Remote Control (Stun, etc.) ESN Validation Late Entry Encryption System Service Registration Roaming Over the Air Update Authentication Composite Control CH Call Queuing 2nd Home Repeater Priority Monitor Failsoft Mandatory : Mandatory Service Std. Option : Standard Option Service

9 Voice Call Services Unaddressed Voice Call (RAN Only) A Subscriber Unit (SU) or console can provide a Voice Call intended for calls to Subscriber Units with same RAN (Radio Access Number), without using any identifier for selective call. Group Voice Call A Subscriber Unit (SU) or console can provide a Group Voice Call intended for calls to multiple Subscriber Units. According to group settings, this can provide a Conference Call for two-way voice calls between selected groups or a Broadcast Call for one-way voice calls to the selected Group. Individual Voice Call A Subscriber Unit (SU) or console can provide an Individual Voice Call intended for calls to a specified Subscriber Unit. Interconnect Call Trunking Repeater Sites (TRS) or Conventional Repeater Sites (CRS) can be connected to telecommunication networks (PSTN/ PSDN), which can offer individual or group voice calls between Subscriber Units and the PSTN/PSDN.

10 6-1-4. Data Call Services Data Call
A Subscriber Unit (SU) or console can transfer data (e.g. text, or AVL data) to an individual or group members. A Data Call can be sent to one specified Subscriber Unit or a Broadcast Data Call to a group can be selected. Short Data Call A Subscriber Unit (SU) or console can transfer a small amount of data to individual or group members. The size of transmission data has a limit because the control channel of a Trunking Repeater Site (TRS) is used. A Short Data Call can be sent to one specified Subscriber Unit or a Broadcast Short Data Call to a group can be selected. Simultaneous Data Call A Subscriber Unit (SU) or console can transfer data at a low speed simultaneously with a voice call during Individual Voice Calls or group voice calls. This function enables data transmission similar to a Short Data call during a voice call.

11 6-1-5. Supplementary Services (1)
Status Call (Status Notice and Status Inquiry) A Subscriber Unit (SU) or console can transfer a simple and fixed message to individual or group members. There are 2 types of usages: preconfigured particular status messages and user defined free-style status messages. Also, there are two methods to send or get a status: Status Notice is a function that an SU sends a status message as necessary, and Status Inquiry is that an SU sends a status message when it receives an inquiry command message. Emergency Call & Alert When a Subscriber Unit (SU) is in emergency condition, an emergency voice call or emergency status message can be sent to an individual or group members. Remote Control (Stun/Revival/Kill, Monitor) A Subscriber Unit (SU) or console can set a specified Subscriber Unit to an inoperative state remotely. There are three kinds of states, Stun, Revival, and Kill, and a Subscriber Unit or console can initiate any of these if enabled. Furthermore, an SU or console can let a specified Subscriber Unit transmit remotely (Remote Monitor).

12 6-1-6. Supplementary Services (2)
ESN Validation Each Subscriber Unit (SU) has a unique Electronic Serial Number (ESN) that is written in its memory device at a factory. A validation facility such as a console can authorize an SU using ESN and prevent unauthorized usage of the system. Late Entry Late Entry enables those Subscriber Units that access a call after a group call is established to automatically join the group call. This scenario could occur when a Subscriber Unit enters the region from outside the coverage area, or if a Subscriber Unit is turned ON after a group call is established. Encryption Contents of voice communication and data communication may be encrypted. Three encryption modes are available; Scramble Mode (15-bit key), DES Mode (56-bit key) and AES Mode (256-bit key).

13 6-1-7. Trunked System Services (1)
Registration In a Trunked Radio System, a Subscriber Unit searches for another control channel when the unit is turned ON, or if the receive signal becomes low in standby mode, to select another Trunking Repeater Site with better signal conditions and the Unit ID may be registered in the new Trunking Repeater Site. Roaming In a Trunked Radio System that has multiple Trunking Repeater Sites (TRS), the location registration is updated and traced in Trunking Repeater Sites when a Subscriber Unit moves around sites. Trunking Repeater Sites broadcast the neighboring site information to transfer the Subscriber Units appropriately. Over the Air Update In Trunked Radio System, Trunking Repeater Sites (TRS) can inform SU over the air, when a new site is added.

14 6-1-8. Trunked System Services (2)
Authentication Using a unique Electronic Serial Number (ESN) given to each Subscriber Unit, a Trunking Repeater Site can authorize a Subscriber Unit and prevent unauthorized usage of the system. Composite Control Channel At a Trunking Repeater Site, if a new transmission request is placed when all traffic channels in the site are busy, a control channel may be assigned temporarily as a traffic channel to enable communication. Call Queuing At a Trunking Repeater Site, if an SU sends a new call request when all traffic channels in the site are busy, the TRS sets the SU queuing state and may keep the SU waiting until the call request is processed.

15 6-1-9. Trunked System Services (3)
Secondary Home Repeater In a Trunked Radio System, SU registers the Trunked Repeater (TR) called Home Repeater. If the line control of the TR becomes inoperative because of some trouble, another TR becomes Secondary Home Repeater which performs line control temporarily. Priority Monitor In the state where an SU is making a group call on a traffic channel, when a priority Group Call begins on other traffic channel or a call request of Individual Call addressing the SU occurs, the SU drops out of the Group Call and can participate in the priority Group Call or the Individual Call. Failsoft If a Trunking Repeater Site (TRS) fails and loses its channel control, the TRS behaves equivalent to a conventional repeater by repeating the received signal so that it provides minimum service to SUs and allows communications between SUs within the service area.

16 6-2. Conventional System 16 bit Unit ID, uniquely definable for each system Identifiable approx. 65,000 units per system 16 bit Group ID, uniquely definable for each system Identifiable approx. 65,000 groups per system 6 bit Radio Access Number (RAN) CTCSS/CDCSS like operation Similar operation to an analog system possible Group call using only RAN (CTCSS/CDCSS like) Selective call using RAN and Unit/Group ID (CTCSS + DTMF like) Even if in Selective Call, Late Entry function works properly Community Repeater operation with RAN 4800bps/6.25kHz and 9600bps/12.5kHz available

17 Trunked System Two types of trunked system Type-C; Centralized control method with the dedicated control channel Type-D; Distributed control method without the dedicated control channel System Configuration Support Multi Site Configuration Support Multi System Configuration

18 6-3-2. Type-C Trunked System
Features Using a dedicated control channel transmitting continuously, Suitable for the sites with many channels and the systems with many sites Efficient packet switched data mode Rapid control channel hunting and site roaming Exclusive channel license necessary System Identification 24-bit Location ID for identifying each system and each site 6-bit Site Code for identifying each site Subscriber Identification 16-bit Unit ID --- Identifiable approx. 65,000 units per system 16-bit Group ID --- Identifiable approx. 65,000 groups per system Available Mode 4800bps/6.25kHz and 9600bps/12.5kHz available

19 6-3-3. Type-D Trunked System
Features All of channels available as traffic channel Efficient channel use in a small number of channels Less channel interference Shared channel license available System Identification 19-bit System ID for identifying each system 8-bit Site Code for identifying each site Home Repeater & Subscriber Identification 5-bit Home Repeater/Prefix for identifying each sub-group 11-bit Unit ID --- Identifiable approx. 2,000 units per prefix 11-bit Group ID --- Identifiable approx. 2,000 groups per prefix Available Mode 4800bps/6.25kHz available

20 6-4. Channel Parameters Dual Data Rates and Dual Channel Bandwidths
4800bps & 9600bps, 6.25kHz BW & 12.5kHz BW Common Parameters Channel Access FDMA/SCPC Vocoder AMBE+2TM Modulation 4 Level FSK TX BB Filter Root Raised Cosine(=0.2) + sinc RX BB Filter Root Raised Cosine(=0.2) + 1/sinc Parameters for 6.25kHz Channel (Mask E) Data Rate 4800bps Frame Length 80ms Deviation Parameters for 12.5kHz Channel (Mask D) Data Rate 9600bps Frame Length 40ms Deviation 2L FSK +1 - 1 4L FSK +3 - 3 CDCSS and LTR NXDNTM & C4FM

21 6-5. Vocoder AMBE+2TM from DVSI Inc. 4800bps mode can use only the EHR
3600bps EHR (Enhanced Half Rate) Voice; 2450bps, FEC; 1150bps 7200bps EFR (Enhanced Full Rate) Voice; 4400bps, FEC; 2800bps 4800bps mode can use only the EHR 9600bps mode can use the EHR or optional EFR P25 Vocoder Compatibility P25 Phase 1 uses 7200bps IMBETM which is has less quality than EFR EFR has a backward compatibility to IMBETM

22 6-6-1. Concept of Channel Definition
Conv. & Type-C 3 Physical Channels (same meaning as “Carrier” or “Frequency”) RCCH (RF Control Channel for Type-C Trunking) RTCH (RF Traffic Channel for Type-C Trunking) RDCH (RF Direct Channel for Conventional) 9 Functional Channels (transferred information dependent) VCH (Voice Channel for Vocoder data) SACCH (Slow Associated Control Channel) FACCH1 (Fast Associated Control Channel 1) UDCH (User Data Channel) FACCH2 (Fast Associated Control Channel 2) BCCH (Broadcast Control Channel) CCCH (Common Control Channel) UPCH (User Packet Channel) LICH (Link Information Channel) 5 functional channels for RTCH and RDCH 3 functional channels for RCCH 1 common functional channel

23 6-6-2. Frame Structure Concept
Common 384 bits 20 16 348 FSW LICH different usage every mode (voice, data, …) 20 16 348 FSW LICH different usage every mode (voice, data, …) 4800bps and 9600bps modes have the same frame structure One frame always has a 384 bit length regardless of the modes 4800bps: 384 bits / 4800 bps = 80 ms frame length 9600bps: 384 bits / 9600 bps = 40 ms frame length FSW (Frame Sync Word) and LICH in the head of frame FSW is the fixed 20 bit pattern for synchronization LICH indicates the kind of radio channel and functional channel Subscriber determines the area following LICH by decoding LICH

24 6-6-3. Voice Frame Structure in 4800bps
Conv. & Type-C 384 bits 72 16 60 20 Voice Only FSW LICH SACCH VCH Stealing Data with Voice FSW LICH SACCH FACCH1 VCH RTCH (trunk) and RDCH (conv.) have the same frame structure AMBE+2TM converts each 20ms voice signal to digitized data 3600bps x 20ms = 72bit, 4 VCH are included in 80ms frame Using “steal”; 2 VCH change to FACCH1, simultaneous Data w/Voice function is available SACCH always attaches VCH for sending the control data Group/Unit ID and many kind of control information FACCH1 is used for Simultaneous Data (Data w/Voice) and Status Call and many kinds of control messages

25 6-6-4. Voice Frame Structure in 9600bps
Conv. & Type-C 40ms, half the 4800bps mode FSW LICH SACCH VCH 72 16 60 20 80ms, 384 bits FACCH1 residual time of 40ms gives more functionality Compatible frame structure with 4800bps, less design complexity In 9600bps mode, more flexible operation is available Using FACCH1, faster Data w/ Voice with no voice quality degradation Using EFR Vocoder, higher voice quality is available If FACCH1 is not needed, intermittent Tx and Rx allows for longer battery Life

26 6-6-5. Data Frame Structure
Conv. & Type-C FSW LICH UDCH or FACCH2 348 16 20 384 bits Data frame sends user data (e.g. text, AVL, image data, etc) In a Long Data Call, user data is divided into many packets, and each packet is divided into blocks again, then one block is carried by one UDCH. FACCH2 is used for Status Call and some control messages

27 6-6-6. Control Channel Frame Structure
Type-C 384 bits 20 16 252 96 FSW LICH CAC (CCCH or UPCH) Guard Inbound 20 16 300 24 24 Outbound FSW LICH CAC (BCCH or CCCH or UPCH) E Post Inbound frame has a 96 bit guard time not to transmit Guard time is or This timing does not require the severe ramping time for TX APC circuitry Outbound frame has an E field and a Post field E (collision control) field is for random access control Post field is for faster frame synchronization

28 6-6-7. Random Access on Control Channel in 4800bps
Type-C Outbound CCCH CCCH CCCH CCCH CCCH 80ms Inbound Unit #1 CCCH CCCH Unit #2 40ms offset 20ms guard time One random access slot identifies one frame Subscriber transmits at 40ms offset to outbound frame Typically the subscriber sends one message using one slot Registration, Call request, Status, etc When sending Short Data, the subscriber can use plural slots CCCH for a single message, UPCH for plural messages

29 6-6-8. Link Time of Group Call in 4800bps
Type-C CCCH 80ms Outbound RCCH CCCH REQ 40ms ASSGN CCCH RX 40ms CCCH Voice Inbound RCCH Inbound RTCH 320ms typically PTT Group Call Sequence (E field handling is omitted) User presses the PTT, then Subscriber sends Call Request using random access on RCCH, then Controller assigns RTCH and Subscriber receives RTCH ASSIGN, then Subscriber moves to the assigned RTCH and starts transmission, then User hears the Proceed Tone and begins to talk Typical Link Time is 320 ms in 4800 bps (similar to LTR system)

30 6-6-9. Link Time of Group Call in 9600bps
Type-C Outbound RCCH CCCH CCCH CCCH CCCH ASSGN CCCH CCCH Inbound RCCH 40ms REQ RX Inbound RTCH Voice 220ms typically PTT Typical Link Time is 220 ms in 9600 bps Call sequence is the same as that of 4800bps Inbound frame offset is 0 ms However Tx <-> Rx switching time are still 40ms This link time is one of the shortest Link Time in LMR systems

31 6-7-1. Concept of Channel Definition
Type-D 1 Physical Channels (same meaning as “Carrier” or “Frequency”) RTCH2 (RF Traffic Channel 2) 6 Functional Channels (transferred information dependent) VCH (Voice Channel for Vocoder data) SCCH (Signaling Control Channel) FACCH1 (Fast Associated Control Channel 1) UDCH2 (User Data Channel 2) FACCH3 (Fast Associated Control Channel 3) LICH (Link Information Channel) 6 functional channels for RTCH2

32 6-7-2. Voice Frame Structure
Type-D 384 bits 72 16 60 20 Voice Only FSW LICH SCCH VCH Stealing Data with Voice FSW LICH SCCH FACCH1 VCH RTCH2 have the same frame structure as RTCH/RDCH except SCCH Using “steal”; 2 VCH change to FACCH1, simultaneous Data w/Voice function is available SCCH always attaches VCH for sending the control data Group/Unit ID and many kind of control information FACCH1 is used for Simultaneous Data (Data w/Voice) and Status Call and many kinds of control messages

33 6-7-3. Data Frame Structure
Type-D 384 bits 288 16 60 20 FSW LICH SCCH UDCH2 or FACCH3 Data frame sends user data (e.g. text, AVL, image data, etc) In a Long Data Call, user data is divided into many packets and each packet is divided into blocks again, then one block is carried by one UDCH2. FACCH3 is used for Status Call and some control messages

34 6-7-4. Link Establishment Frame Structure
Type-D 384 bits 144 16 60 20 Inbound FSW LICH SCCH FACCH1 Guard 144 120 16 60 20 24 Outbound FSW LICH SCCH FACCH1 N Post Frames during link establishment are similar to the frame structure of Voice Frame Inbound frame has a 144 bit guard time not to transmit Outbound frame has a Null field and a Post field E (collision control) field is for random access control Post field is for faster frame synchronization

35 6-7-5. Link Time of Group Call on Home Repeater
Type-D 50ms RX PTT 70ms Voice 400ms typically 80ms REQ RESP N Outbound Inbound Group Call Sequence User presses the PTT, then Subscriber sends Call Request using random access, then Subscriber receives Call Response from Home Repeater indicating receive success, then Subscriber starts transmission on Home Repeater, then User hears the Proceed Tone and begins to talk Typical Link Time is 400 ms (similar to LTR system)

36 7. NXDNTM Compliance Certification
Compliance Certification for NXDNTM compatible products produced and/or sold by NXDN Forum members are defined as follows; 1) Developers must apply to Technical Working Group according to the NXDNTM Compliance Certification Procedure document provided to the Forum members. 2) Compliance Certification includes application examination, conformance tests and other requirements. 3) The use of the NXDNTM logo mark is permitted upon successful completion of the Compliance Certification.

37 8. Revision Record for this Document
August 3,  Version 1.0 February 5, 2008 Version 1.1 January 19, 2012 Version 1.2


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