1. Mission Critical User Needs

2. Mission Critical User Needs
The main needs of the mission critical PMR users, such as the ones representing the Public Safety and Security (PSS) forces can be briefly categorized as follows:
Specialized functionality
Instant connection
Security
Dynamic management of talk groups
Emergency calls
Prioritization of communications

3. Mission Critical User Needs
Response times
Typical requirements for voice call set-up time are in the range 0.3 to 1 second
Seamless radio coverage
Throughout the whole served area, including guaranteed availability of coverage under exceptional conditions, including the means to maintain communication during network outage

4. Mission Critical User Needs
Incident capacity
the need for radio capacity increases during major incidents and accidents and that capacity must be guaranteed to the rescue and law enforcement forces
Uncompromised voice quality
allowing the listener to recognize who is speaking, even under excessive background noise

5. Mission Critical User Needs
Radio coverage
Complete coverage under normal operating conditions
Mechanisms to guarantee coverage for rescue forces under exceptional conditions
Members always hear
A mechanism usually called Late Entry is needed to rejoin lost talk group members in the call

6. Mission Critical User Needs
Network Cost
Also sharing of network infrastructure with commercial users should give cost benefit.
Mobile terminals cost

7. Available Public Safety Communication Systems PMR
Conventional single repeater Systems
Simulcast Radio System
Multicast Radio System
Trunked Radio System
TETRA Radio System

8. What is TETRA? UHF Radio network
TErrestrial Trunked RAdio (TETRA) is the modern digital Private Mobile Radio (PMR)and Public Access Mobile Radio (PAMR) technology.
TETRA uses Time Division Multiple Access (TDMA) technology with 4 user channels on one radio carrier
TETRA provides voice and data communication and suits a wide range of users.

9. TETRA
Adopted by 77 countries ( Europe – Asia – Africa and South America
1076 contract around the world to date
ETSI standard – non proprietary
Multi vendor subscriber units .
Low cost – more features – continuous development

10. Voice Communication Services
Excellent voice quality
Fast call set-up
Individual (one-to-one) calls (Full duplex)
Express calls (push & talk)
Group communication
Broadcast groups
Group calls
Scanning of groups
Dynamic regrouping
Emergency calls
Direct Mode
Supplementary services
Extensive security:
Authentication of radios
Encryption of voice, data & signaling

11. What makes TETRA unique
Unique group communication package in total
Fast call set-up time
Direct Mode (DMO)
Queuing of channel resources
Signalling during voice call
Pre-emptive priorities, ambience listening
Multiple security schemes & algorithms
authentication of radios (& networks)
air interface & end-to-end encryption
disabling of stolen radios
TETRA is the only open standard to effectively combine group radiocommunications, mobile telephony and mobile data.
The most demanding PMR user communities have had their needs clearly visible in the standard contents, aiming at:
- ultra fast response times
- security
- availability of service under all circumstances
Only TETRA provides all this in the same package.

12. Supplementary Services
Busy Queuing and Call Back
Queuing Priority
Recent User Priority
All Start / Fast Start
Late Entry
Critical Site Assignment
Requested Sites
Talking Party Identification
Calling Line Identification Presentation
Dynamic Site Assignment
Valid sites
Dual Tone Multi-Frequency Overdial
Priority Monitor
Pre-emptive Priority Call
Pre-emptive Priority Call – Busy User Pre-emption
Site Wide Call
Barring Incoming Calls
Barring Outgoing Calls
Air Interface Encryption
Authentication (MSO initiated)
Supplementary Services
Busy Queuing and Call Back – places MSs in busy queue when no voice channels are available, then calls back MSs as channels become available.
Queuing Priority – assigns resources for calls according to individual or group priority level. Priority 1 is reserved for emergency calls. Individuals and groups are assigned priorities 2-10.
Recent User Priority – if MS initiates a call within 10 seconds after a call disconnect, it is given priority in the busy queue.
Dynamic Site Assignment – traffic channels are only assigned at sites where one or more group members are registered.
Valid Sites – talkgroup can be defined to only operate at particular sites.
All Start / Fast Start – for All Start, the system waits for all necessary resources before starting the call. For Fast Start, call is set up with any available sites. Other sites are added to the call when available.
Critical Site Assignment – sites defined as critical must be included when a call is set up (even if Fast Start)

13. Transportable Dimetra Site VSat Satellite MTS 2 Dimetra Master site
E1 Link
E1 Link
Dimetra Master site
System Databases
User Configuration Server database – contains subscriber/user configuration data. Located on UCS.
System Statistics Server database – stores and reports cluster-level statistics. Located on SSS.
Zone Statistics Server database – stores and reports zone-level statistics. Located on ZSS.
Zone database – contains replication of UCS database, plus infrastructure information for the zone. Located on ZDS.
Zone local database – contains infrastructure information for zone. Located on zone controller.
FullVision database – includes state and alarm information. Located on FullVision server.
Elite Databases (Alias/Console) – contains information to support dispatch consoles (alias and console configuration settings).
See Volume 1, Chapter 6, “System Databases”.
MTS 2
Transportable Dimetra Site
For rural area and temporary coverage

14. Wireless Console To PSTN Cross Patch Operation Conventional Network
Tetra Network
Conventional Network
Tetra Radio
Conventional
Radio
To PSTN
Cross Patch Operation

15. Data Communication Services
Status Message
User sends pre-coded message to the console
Sent from radio keypad or interface
Database inquiry
Predefined Auto reply
Short Data service
Messaging to and from a host
English text messages up to 140 characters
Arabic text messages up to 70 characters
Simultaneous “voice & short data”
Packet Data
Similar to short data
Larger data file transfer
Photos, reports…etc
Tailored WAP applications
Going to lunch
123

16. Short Data Applications
Short Data Application Examples:
iSDS
Work orders, group messaging.
Reports.

17. Tetra Coverage
Ismailia
Cairo
Sharm
Hurgada
Tetra Coverage

18. Tetra Cairo Sites

19. Radio Operation Manager
Thank You
Contact Information
Mostafa Al Awad
Radio Operation Manager
Systel - Egypt