Introduction tetra over ip
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Introduction TETRA over IP. Bert Bouwers Rohill Technologies B.V. Agenda. TETRA-over-IP (ToIP) basics Benefits of TETRA-over-IP Myths about TETRA-over-IP Potential difficulties and concerns Guidelines for ToIP system evaluation Summary of facts. TETRA-over-IP basics.

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Introduction tetra over ip

Introduction TETRA over IP

Bert Bouwers

Rohill Technologies B.V.


Agenda

Agenda

  • TETRA-over-IP (ToIP) basics

  • Benefits of TETRA-over-IP

  • Myths about TETRA-over-IP

  • Potential difficulties and concerns

  • Guidelines for ToIP system evaluation

  • Summary of facts


Tetra over ip basics

TETRA-over-IP basics

  • Use the Internet Protocol (IP) to connect Base Stations and SwMI together

  • Real TETRA-over-IP requires efficient mechanisms to transport both call setup signalling and speech / data traffic

  • ToIP is a compromise solution. There is a considerable debate whether IP is the best solution or should be avoided.


Tetra over ip networking

TETRA-over-IP networking

  • Can be deployed over any IP network

    • Internet

    • Intranet

    • Local Area Network (LAN) using Ethernet

  • Transparent operation over

    • Routers

    • Switches

    • Hubs


Conventional tetra network

PABX, PSTN,

ISDN

Intranet /

Internet

Other TETRA

network

Conventional TETRA network

Network

Management

Line

Dispatcher

SwMI

IP gateway,

Firewall


Tetra over ip network

PABX, PSTN,

ISDN

Intranet /

Internet

Other TETRA

network

TETRA-over-IP network

ISI / IPI

gateway

Network

Management

Line

Dispatcher

Database

server

Telephony

gateway

Ethernet LAN

IP gateway,

Firewall


Benefits of tetra over ip 1

Benefits of TETRA-over-IP (1)

  • One architecture for multiple purposes

    • Transport of TETRA traffic and signalling

    • Exchange of Status, SDS and Packet Data

    • Integrated platform for Network Management (SNMP, HTTP)

Network

Management


Benefits of tetra over ip 2

Benefits of TETRA-over-IP (2)

  • Large part available as COTS

  • Routers and switches

  • PC based platforms for database servers and telephony gateways

  • System software – Windows or Linux


Benefits of tetra over ip 3

Benefits of TETRA-over-IP (3)

  • Support of virtually any type of network topology

Star topology

Ring topology

Meshed topology


Benefits of tetra over ip 4

Benefits of TETRA-over-IP (4)

  • Resilience for link failures

    • If proper network topology is selected

  • Resilience for network component failures

    • If distributed and replicated databases and redundant TETRA network components are used


Does toip save costs

Does ToIP save costs ?

  • NO, not really, because

    • A separate, private IP network is needed for ToIP to prevent delays and ensure security

    • Additional routers are needed to interconnect the IP components to line circuits (Synchro-nous V.35 / V.11, ISDN, DSL, Frame Relay)

    • IP uses more bandwidth because of packet headers (IP, UDP, TCP)


Is toip a standard

Is ToIP a standard ?

  • NO, not really, because

    • Current ToIP solutions are not compatible with industry-standard Voice-over-IP (VoIP) standards, such as H.323 and SIP

    • Each manufacturer has defined its own protocols for call establishment, transport of speech, database synchronization, etc.

    • IP is not the same as Ethernet: optimizations on the Ethernet level may prevent the use of standard IP router equipment


Why not use h 323 or sip

Why not use H.323 or SIP ?

  • Additional call setup delay because of negotiation through MGC or Gatekeeper

  • Additional speech delay due to increased packet length and session control

  • No TETRA ACELP gateways available on the market, thus transcoding is needed to realise an open solution, resulting in degradation of speech quality


Potential difficulties of toip

Potential difficulties of ToIP

  • Extra speech and call setup delay caused by serialisation of data packets within radio sites and IP routers

  • Jitter caused by queuing of packets in IP infrastructure – requires additional buffering of speech packets

  • Risk of packet loss or delayed packets due to network congestion


Additional concerns

Additional concerns

  • Prioritisation of different packets

    • TETRA speech traffic needs higher priority then call setup, SDS and Network Management

    • Should be based on open standards, otherwisebenefits of using COTS will disappear


How to deal with these difficulties

How to deal with these difficulties

  • Use plenty of extra bandwidth to ensure low serialisation delays and reduction of packet delay and packet loss – typically four times minimum required bandwidth

  • Establish a separate IP network for networking TETRA system components

  • Use QoS mechanisms such as MPLS to allow prioritisation of IP packets


Criteria for system evaluation 1

Criteria for system evaluation (1)

  • Required bandwidth for IP links

    • Is it available and also cost effective ?

  • Are the proposed IP routers and links suitable for mission-critical applications ?

    • Evaluate reliability of equipment (MTBF)

    • Observe link reliability – avoid DSL and WLAN !

  • Level of resilience in case of link failures

    • Is the network topology designed in such a way that continuous operation is ensured in case of link failures ?


Criteria for system evaluation 2

Criteria for system evaluation (2)

  • Level of system resilience

    • Are databases replicated for redundancy ?

    • Are the proposed link bandwidths sufficient for database synchronisation all over the network ?

  • Is the system based on open standards and platforms ?

    • Multi-vendor availability of routers, switches

    • Hardware platform and operating systems

    • Can the equipment be networked with standard IP routers, not only on Ethernet level ?


Summary of pros and cons

Summary of Pros and Cons

  • Offers a convergent network for TETRA speech, signalling, messaging and network management

  • Potential to use COTS equipment and software

  • Potential to provide resilience in case of link failures

  • Networking flexibility – find optimum balance between link cost and resilience

  • Extra bandwidth required for overhead of IP packets

  • Extra call setup and speech delay caused by serialisation of data over low-speed links

  • Risk of packet loss and non-sequential arrival of packets

  • Additional cost for router equipment

  • IP equipment and networks not always suitable for mission-critical applications


Conclusion

Conclusion

  • IP is a proven solution for data transport, and maturing for real-time voice transport

  • For mission critical use, including encryption, protocols and platforms have to be substantionally optimized

  • Use of IP will increase price and require sufficient bandwidth on each site

  • Increase of call setup time and speech delay is unavoidable


Introduction tetra over ip

Thank you for your attention !

Questions ?


Glossary 1

Glossary (1)

Abbrev.

Description

Definition

ACELP

Algebraic Code-Excited Linear Predictive

ETS 300 395-2

COTS

Commercial Off The Shelf

-

DSL

Digital Subscriber Line

TS 101 388

HTTP

Hyper Text Transfer Protocol

RFC 2616

IP

Internet Protocol

RFC 791

IPI

Internet Protocol Interworking

EN 301 747

ISDN

Integrated Services Digital Network

TBR 003

ISI

Inter System Interface

EN 300 392-3

LAN

Local Area Network

IEEE 802.3


Glossary 2

Glossary (2)

Abbrev.

Description

Definition

MGC

Media Gateway Controller

RFC 3054

MPLS

Multiprotocol Label Switching

In progress

MTBF

Mean Time Between Failure

MIL-HDBK-217

PABX

Private Automated Branch Exchange

-

PC

Personal Computer

-

PSTN

Public Switched Telephone Network

-

QoS

Quality of Service

See RFC 2990

SDS

Short Data Service

EN 300 292-2

SIP

Session Initiation Protocol

RFC 3261


Glossary 3

Glossary (3)

Abbrev.

Description

Definition

SNMP

Simple Network Management Protocol

RFC 1157

SwMI

Switching and Management Infrastructure

EN 300 392-1

TCP

Transmission Control Protocol

RFC 793

TETRA

Terrestrial Trunked Radio

EN 300 39x

ToIP

TETRA over Internet Protocol

-

VoIP

Voice over Internet Protocol

See SIP/H.323

UDP

User Datagram Protocol

RFC 768

WLAN

Wireless Local Area Network

IEEE 802.11


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