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Presentation to TETRA BUSINESS SYSTEMS GROUP AN INTRODUCTION TO THE PEI Nick Smye 15 February 2000 Concepts to Reality e-mail: masoncom@masoncom.com www.masoncom.com FORMAT 1.Introduction to Mason Communications 2. Radio Peripheral Interfaces 3.PEI Overview 4.AT Command Set

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Presentation toTETRA BUSINESS SYSTEMS GROUPAN INTRODUCTION TO THE PEI

Nick Smye

15 February 2000

Concepts to Reality

e-mail: masoncom@masoncom.com

www.masoncom.com


FORMAT

1.Introduction to Mason Communications

2. Radio Peripheral Interfaces

3.PEI Overview

4.AT Command Set

5.PPP/TNP1 Command Set

6.Current Status of PEI

7.Conclusion


INTRODUCTION TOMASON COMMUNICATIONS

  • Telecoms and IT Consultancy

    • What is our TETRA Experience?

  • Worked with Home Office on PSRCP since 1994

    • Business Case Phase

    • Project Definition Study Invitation to Tender

    • User Service Level Requirements

    • Project Definition Study Phase

  • Greater Manchester Police - Business drivers for TETRA

  • Terminal & Peripheral Equipment

  • Integrated TETRA Radio & Telephony


INTRODUCTION TOMASON COMMUNICATIONS

  • Lancashire Constabulary - Pilot Assurance Support

  • States of Jersey Police

    • Validation of pilot system

    • Re-validation after upgrade

  • European GSM Operator – assistance with RFP to support a Public TETRA Licence Bid

  • Technical Advisers to PITO


RADIO PERIPHERAL INTERFACESRadios and Peripherals

  • In early days (pre-trunked), professional radios tended to be specialised and expensive

  • Peripherals limited and manufacturer specific

    • Remote microphone

    • Earphones/Headsets

    • Speakers

  • Some peripheral specialists

    • Products ordered to a specific interface (££ + time)

    • E.g. Handsfree mic

(e.g. Sonic)


RADIO PERIPHERAL INTERFACES Trunked Radio

  • Introduction of trunking with standard and open systems (MPT 1327/MPT1343)

  • Radio offers access to powerful new functionality (speech+ status/short data/data)

  • System performs Dynamic Channel allocation

  • Applications are now able to to use these features…plus access to radio

  • BUT.. How do we access these features in a non-proprietary manner?


RADIO PERIPHERAL INTERFACES MAP27 Interface Standards

  • Initially some manufacturers used proprietary interfaces

    • Applications manufacturer specific

    • Fleets with more than one manufacturer

  • Open standard, MAP27, published in 1992

  • Most manufacturers support it

  • Defined interface (RX,TX GND) and Layered Protocol

  • Data Link Layer uses a block format, delimited by control characters

  • Allows simultaneous operation (e.g. RSSI check during a data call)

ESI Case


RADIO PERIPHERAL INTERFACES

MAP27

Network Layer

Data Link Layer

Blocks delimited by Control Characters

Provides Block Transport

Terminal

Radio

Network Layer

Data Link Layer

Physical Layer

Status

Short Data

Voice and NPD

Modem Call

Connection Clear

Diversion

Radio Control


RADIO PERIPHERAL INTERFACES What is the GSM Approach?

Base GSM

GSM 07.07

GSM 07.05

SMS

GSM 07.60

GPRS

All AT command Based

Call Control

Network Service

Mobile Equipment Control and Status

AT and Block

Message Retrieval and Transmission

Hex Encoded Binary

Block mode – similar to MAP27

PPP command Based

X25

PPP

IHOS

AT

PPP Dial In Compatibility


PEI OVERVIEWTETRA – Open Standards Based Architecture

I4’

I6

Network

Management

I4

I2

I5

I1

I3

TETRA 1

TETRA 2

DEFINED INTERFACES

I1 Radio air interface

I2 Line station interface

I3 Inter-system Interface

I4 Terminal equipment interface (MS & TE)

I4’ Terminal equipment Interface (LS & TE)

I5 Network Management Interface

I6 Direct Mode radio air interface

NSS

BSS

PSTN

PTN

ISDN

PDN

OMC

GATEWAYS


PEI OVERVIEW Peripheral Equipment Interface

  • Defined Standard for access to:

    • Data

    • Set-up and Control of Voice Calls

    • Radio Specifics (e.g. battery status)

    • User Applications in Radio

  • Standard Physical Interface (?)

  • Minimal Extra Software in Terminal ( Driver)

  • Max compatibility with GSM

  • Still in draft


PEI OVERVIEW Physical Connection

  • Physical layer V24/V28

    • D type (RX,TX,GND)

    • RJ11/RJ45

  • Other Serial Form Physical Layers can be used where Appropriate

    • Infrared (GSM?)

    • Ethernet

    • Bluetooth?


PEI OVERVIEW PEI PROTOCOLS

PEI PROTOCOLS

AT Commands

PPP Commands

Radio

Remote Control

Packet Data

Short Data

Circuit Mode Data

Radio Functions

IPv4

IPv6

Speech CC

SDS

Radio Config & Status

Supplementary Services

CM Data


AT COMMAND SETCommands

  • AT Commands well known in Industry

  • “+C” prefix reserved for Digital Cellular

  • PEI AT Commands Based on:

    • Cellular DCE Control

    • PCCA Wireless Modems

    • TETRA Specific

    • SDS (very similar to GSM)

    • Radio Control


AT COMMAND SETTypical Applications

  • Those suited to small data transfers using TETRA SDS

    • Type 1 – 16 bit

    • Type 2 – 32 bit

    • Type 3 – 64 bit

  • Type 4 – up to 2039 bits (Advanced Link recommended for user data longer than approx. 133 Octets)

  • Short Data Transfer Layer (SDS-TL)

    • Built on top of SDS Type 4

    • Provides end to end acknowledgment

    • Store and Forward

  • Typical Application - AVL

ARDxx: voice in GSM – audio routing man specific


AT COMMAND SETLimitations

  • Terminal is either in Command State or On-line Data State

    • In On-line Data state, no other communication with radio is possible (e.g. battery state)

  • Usefulness is limited to SDS, Circuit Mode Data

    • What support for CM data?

  • No current support for voice calls


AT COMMAND SETAdvantages

  • Simple to implement

  • No need for TCP/IP stack and PPP layer

    • Reduces terminal’s complexity, memory requirement

    • Reduced Power consumption

  • Easy to debug


PPP/TNP1 COMMAND SETWhat is PPP?

  • Point-to-Point Protocol

  • Standard Internet (IETF) Open Protocol

  • Standard method of transporting multi-protocol datagrams over point-to-point links

    • Method for encapsulating multi-protocol datagrams

    • Link Control Protocol for establishing, configuring and testing the link

    • Family of Network Control Protocols for establishing and configuring the Network Protocols that run over PPP

  • THE standard for PCs for dialup internet (IP) access


PPP/TNP1 COMMAND SET PPP Frames

FCS

Frame End

Frame Start

Protocol

DATA

Padding

  • 0xC021Link Control Protocol – establishes, maintains and ends PPP

  • 0x0021IP Protocol

  • 0x8021Internet Protocol Control Protocol – establishes configuresand terminates the TCP/IP session

  • 0x0287TETRA Network Protocol 1

  • 0x8287 TETRA Network Protocol 1 Control Protocol


PPP/TNP1 COMMAND SET PPP Mode Structure

User Terminal

RADIO

RADIO CONTROL

DATA

TNP1CP

Network

Layer

TCP/IP

TNP1

Data Link

Layer

PPP Frame

PPP Frame

PPP Frame

IPCP

PPP

PPP

LCP

RS232


PPP/TNP1 COMMAND SET IP Protocol

  • IP provides the means of transporting the application data

  • IP is universally used

  • IPv4 and IPv6 Supported by PEI Specification

  • Provides for standard interconnection at the SwMI to external IP networks (e.g. host computer) via router/gateway

  • BUT not as efficient as SDS for transfer of short messages


PPP/TNP1 COMMAND SET TNP1 Protocol

  • This provides the means of setting up calls and controlling the radio

  • No equivalent functionality in existing Internet Specifications and so this is unique to TETRA

  • Uses standard PPP frames with a TNP1 Protocol number (0x0287)


PPP/TNP1 COMMAND SET TNP1 Commands

  • Radio Control and Call set-up

    • Priority

    • Group Attachment

    • SDS

    • Duplex/half duplex

    • Energy Saving Mode

    • Etc.

  • Allows proprietary defined information to be sent and received from radio


PPP/TNP1 COMMAND SET TETRA PEI PPP Issues

  • PPP must be used for TETRA Packet Data Services

  • No manufacturers are currently supporting IP packet data

  • PPP/TNP1 complex to implement in radio and terminal

    • Memory

    • Power consumption

    • Development effort


CURRENT STATUS OF PEI

  • Still under draft

  • Complex standard – TETRA MOU have proposed a subset of the AT commands

  • PPP/TNP1 support awaiting rollout of Packet Data?

  • What is the current level of support?

  • Are all manufacturers going to support it?

  • Will the widespread adoption of GPRS influence TETRA?


CONCLUSION

  • PEI Standard defined for TETRA Terminals

  • AT and PPP modes

  • AT simple and suited to small data requirements

  • PPP complex but powerful – the only choice for packet data

  • What is the support from the manufacturers and the timescales?


  • Military

  • No access to CODEC

  • SDS-TL

  • IP overhead vs SDM?

  • AT/Radio turnon

  • Suppl Serv?

  • Voice call using AT?

  • IP When


CASE STUDY -Public Safety Radio Communications Project

  • Business Case Phase

    • Evaluation of suitable systems

    • Technical input to Business Case

  • Project Definition Study Invitation to Tender

    • Functional Specification

    • Terms of Reference

  • User Service Level Requirements

    • Service Level Template and Guide

  • Project Definition Study Phase

    • Ongoing review of Study Products

    • Review of FDS and Operational Trials.


PUBLIC SAFETY RADIO COMMUNICATIONS (PSRCP) PROJECT

  • Home Office - Technical Advisers

  • Greater Manchester Police - Business drivers for TETRA

  • Lancashire Constabulary - Pilot Assurance Support

    • Terminal & Peripheral Equipment

    • Integrated TETRA Radio & Telephony

  • Hampshire Police - Impact of PSRCP Appraisal

  • Cheshire Constabulary - Assurance Support.


PUBLIC SAFETY RADIO COMMUNICATIONS (PSRCP) PROJECT

  • Home Office - Technical Advisers

  • Greater Manchester Police - Business drivers for TETRA

  • Lancashire Constabulary - Pilot Assurance Support

    • Terminal & Peripheral Equipment

    • Integrated TETRA Radio & Telephony

  • Hampshire Police - Impact of PSRCP Appraisal

  • Cheshire Constabulary - Assurance Support.


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