GB2518581A

GB2518581A - SRGW1 TCP/IP TETRA gateway

Info

Publication number: GB2518581A
Application number: GB1307001.6A
Authority: GB
Inventors: Ranjit Singh Rai
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-04-17
Filing date: 2013-04-17
Publication date: 2015-04-01
Also published as: GB201307001D0

Abstract

A single electronic computerised gateway box, SR GW1, with bespoke interfaces allows interconnectivity between a TETRA or P25 narrowband radio technology switch and standard TCP/IP versions 4 and 6 (IPv4/1Pv6) command and control or control room dispatcher systems. It allows infinite or large number of radio to smart mobile phone talkgroups (between 1-1000) known as PTT "push to talks depending upon the bandwidth of the radio manufacturers interface. The gateway connects to the MotorolaRTM TETRA family of products (specifically to AmbassadorRTM and DimetraRTM switches) via the AEB (Ambassador Electronics Bank) or CEB (Central Electronics Bank) interface. The gateway collects relevant voice calls and packages them into TCP/IP Voice over IP calls using SIP (Session Initiation Protocol). The connectivity can be through an RS232 asynchronous or full synchronous connection or El carrier interface into the CEB and then connecting via RJ45 UTP or Fibre LC connection into any other 3 party dispatcher service product, thereby allowing an infinite number of talk groups as opposed to the conventional 4 wire system which has a limitation of around 150 talkgroups per device.

Description

tM:;: INTELLECTUAL

PROPERTY OFFICE

Application No. GB1307txJ1.6 RTM Date:23 October2013 The following terms are registered trade marks and should be read as such wherever they occur in this document: Motorola Cisco Unix Dimetra Intellectual Properly Office is an operaling name of Ihe Patent Office www.ipo.gov.uk SRGW1 TCP/IP TETRA Gateway (SR GateWay 1)

Background:

There is currently a need for smart phones (IE: handheld electronic mobile phones Apple iPhone & Android phones, we will refer to these devices as smart phones and! or smart devices throughout this document) to communicate with Radio devices (IE: TETRA, In specific to this design Motorola product family of TETRA switches, Ambassador and Dimetra family).

Specifically TETRA uses Multiplexing protocol to divide each individual voice channel or voice call or talk group. The talk group(s) are controlled by zone controllers (Motorola Dimetra product) by devices known in the industry as a Dispatch Console or Control Room Dispatcher who's function is to Patch the relevant person with the handheld TETRA radio to another or a group of TETRA handheld(s) radios(s). This creates a voice NOT DATA talk group(s) between individual(s). There can be anything between 50-1000 + talk-groups per TETRA network.

There is a need for a Smart Device(s) to have the ability to communicate with the TETRA radio system. This can be achieved via what is known as a 4 wire E&M card (Cisco IPICS solution) using any Cisco 2901, 2911, 2951, 3925, 3945 series routers, with Cisco lOS version 15x software and the following line cards (See IPICS Matric table listed APPENDIX 1) and call manager software. The result is a LMR (Land Mobile Radio) which connects to the TETRA and/or P25 radio network via a 4 wire E&M card. The LMR acts as a gateway for the TETRA & TCP/IP Smart Device(s) and provides the facility for both devices to create talkgroup(s) group call(s) between devices for Voice communication. For data and voice the IP smart phones can send/ receive to all components within the network nodes i.e.: dispatcher & other Smart Device(s) Desk Phone(s) and Voice Call(s) to TETRA radio(s). This type of service is what we call unified communication or Hybrid.

However this unified communication or Hybrid service has its limitations. The 4 wire E&M interface is legacy and has restrictions on the technology for integration and design. The limitations are on: 1. The number of talk groups the design is capable of.

2. The overall connectivity on the design between TETRA & IP via LMR 3. Software and protocol used for the Talk-groups.

4. Cost effective scalability is expensive.

There are significant step change improvements which can over-come the limitations in the current design, which are set out in this text.

Summary:

The design is a single box referred to as a Gateway name srwgl. The Gateway has the ability to communicate using Software which is UNIX based and or 3BSD code (l6-l2Sbit software with 256 bit encryption ability and TCP/IP stack) will connect to the Motorola TETRA family of products (In specific to this design Motorola product family of TETRA switches, Ambassador, Dimetra) via the AEB (Ambassador Electronics Bank) or CEB (Central electronics bank interface) from here the srwgl will collect relevant voice calls and package them into TCP/IP Voice over IP calls by using SIP protocol. The connectivity will be through an El (E-carrier) circuit asynchronous or full synchronous connection into the CEB or AEB port within the Zone or Motorola Ambassador switching unit this will inter-connect via an RJ45 UTP or Fibre LC connection using the TCP/IP Protocol and routing functionality into the Cisco IPICS or any other 3 party Dispatcher Service Product. This design will allow an infinite number of talk groups as opposed to the 4 wire system which has a limitation of say talkgroups per device.

Thus the SRGW1 will be a gateway will: 1. Connect to the AEB or CEB Motorola family of product's listed.

2. Allow significantly large volumes of talk-groups per device (Per srgwl) say up to 1000 + voice and data talk-groups as an example between TETRA and Smart Device(s) by use of TCP/IP version 4 or Version 6 for Push To Talk service (PU).

3. Have 100Mbps lgigabibit, lOgigabit, loogigabit interface to connect to a 3"' party dispatcher service product such as Cisco IPICS and other similar service products (iccs).

4. Provide significant scalability and efficiency improvements.