XPT Digital Trunking System
White Paper
Date: 03-2015
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Contents
1. Preface ......................................................................................................................... 1
2. XPT System Overview ................................................................................................ 2
3. XPT System Hardware ................................................................................................ 6
3.1 XPT Base Station .................................................................................................... 6
3.2 XPT Terminals ......................................................................................................... 6
4. XPT Features ............................................................................................................... 8
5. XPT Technology Performance ................................................................................... 9
6. XPT Applications...................................................................................................... 10
6.1 XPT System with Hytera RDAC ............................................................................. 10
6.2 XPT System with SmartDispatch ........................................................................... 10
7. Advantages of XPT System ...................................................................................... 12
7.1 Maximizing the Capacity ........................................................................................ 12
7.2 Extending the System Cost-efficiently ................................................................... 13
7.3 Providing Outstanding Functions and Flexibility .................................................... 13
7.4 Improving Fault-tolerance Performance ................................................................ 14
7.5 Balancing System Communication Load ............................................................... 15
7.6 Reducing Conflicts via Handshaking Mechanism .................................................. 15
8. Summary .................................................................................................................... 16
I
1. Preface
With clearer voice, better privacy, longer battery life, abundant data service and double
channel efficiency, DMR (Digital Mobile Radio) is becoming more versatile in the
professional two-way radio communication. In the meantime, Hytera announced the
Pseudo Trunk technology to help sharing the 2 time slot of TDMA in automatic mode.
Since then, DMR users could use a 2 channel digital trunking system with one frequency
and the cost of a conventional system.
After the migration of analog to digital, digital communication industry is developing
rapidly and its products are becoming faster, smarter, broader bandwidth and more
sophisticated. With on-going development of business and growing number of team
members, the current conventional system can no longer satisfy the communication
requirement of large enterprises. Many enterprises desire for a two-way radio
communication solution with an extensible voice and data capacity based on the current
conventional system to support more users to share the voice and data communication of
the key business.
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2. XPT System Overview
XPT (Extended Pseudo Trunk) is a new distributed trunking system solution developed
solely by Hytera, which is further developed on the basis of Pseudo Trunk technology
and combined with advantages of digital trunking system. The XPT system has three
main advantages: Dedicated control channel not required, large capacity and easy
migration of infrastructure.
Digital conventional communication system combines the advantages of two-way radio
communication and digital technology, and also has many strengths and functions of
analog system. But in conventional communication system, the channel resource
utilization is restricted due to one channel only support one call at a time. Thus, multiple
radios communication is restricted in digital conventional communication system. Digital
trunking system has larger coverage, stronger noise cancelling capability and its channel
resource can be allocated automatically. But the platform construction of trunking system
is complex and it is inconvenient to upgrade a conventional system to trunking system.
Moreover, trunking system will require a large amount of equipment and cost to support.
Figure 1: XPT digital trunking system
XPT system is an economical and practical digital upgrading solution, which can build an
extended pseudo trunking system using multiple repeaters. It is suitable for professional
customer whose digital key business is based on digital conventional communication
system. XPT system has the scale and efficiency of trunking technology, clearer voice
quality, and extended communication capacity realized by sharing the logic channel
resource of the repeater. It can support high density voice and data communication of
thousands of people using only one single base station.
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The differences between XPT system and conventional system or trunking system are
listed below.
Figure 2: Differences between conventional and trunking system
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WAN
…
Master Repeater
Slave
Repeater
Slave
Repeater
Slave
Repeater
Router
Application *
RDAC
IPPBX *
Telephone Network
Static IP
SmartDispatch *
Switch
Network structure of XPT system is shown as follows.
Third Party
Figure 3: Network structure of XPT system
XPT system is a single-site digital trunking system which consists of one master repeater
and multiple slave repeaters. When configuring XPT single site system, the radios will be
allocated with specific frequency and slot in advance. An idle radio always monitor its idle
home repeater. The home repeater will broadcast the XPT system status information in
each frequency via beacon signal, so as to inform the radio of available channel
resource. In such case, the radio can switch to an available channel and slot to
communicate.
Note: Items with * (include SmartDispatch connecting through IP network,
Development API and IPPBX gateway features) will be available in XPT R2.0.
XPT system can be enabled only by upgrading the firmware version of radios and
repeaters on the basis of the current digital conventional mode. In such case, enterprises
4
can extend the communication capacity of existing system without purchasing extra
equipment, which can greatly reduce the upgrade cost. Moreover, XPT system also
support the digital functions of conventional system. It can provide high capacity, large
coverage and cost-efficient digital trunking solution by using entry level digital repeater
configuration.
5
Terminal
Model
Frequency Range
PD60X
VHF(136-174MHz), UHF(400-527MHz)
PD66X
VHF(136-174MHz), UHF(400-527MHz)
PD68X
VHF(136-174MHz), UHF(400-527MHz)
3. XPT System Hardware
3.1 XPT Base Station
The main components of a single site XPT system includes repeater (RD98XS),
combiner, divider, duplexer and IP switch. All the repeaters in the site are connected to
the IP LAN network. One of them will work as master repeater and all the rest repeaters
will work as slave repeaters.
Figure 4: Infrastructure of XPT system
3.2 XPT Terminals
Hytera DMR terminals can be upgraded to XPT mode without any additional license. The
firmware of terminals must be R7.0 or higher version. Supported terminal models and
frequencies are listed below:
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Terminal
Model
Frequency Range
PD70X (G)
VHF(136-174MHz), UHF(400-470MHz, 450-520MHz,350-400MHz)
PD78X (G)
VHF(136-174MHz), UHF(400-470MHz, 450-520MHz,350-400MHz)
X1e
VHF(136-174MHz), UHF(400-470MHz, 450-520MHz,350-400MHz)
X1p
VHF(136-174MHz), UHF(400-470MHz, 450-520MHz,350-400MHz)
PD79XEx IIC
VHF(136-174MHz), UHF(400-470MHz, 450-520MHz,350-400MHz)
PX70X UL913
VHF(136-174MHz), UHF(400-470MHz, 450-520MHz)
PD78X UL913
VHF(136-174MHz), UHF(400-470MHz, 450-520MHz)
X1p UL913
VHF(136-174MHz), UHF(400-470MHz, 450-520MHz)
MD65X
VHF(136-174MHz), UHF(400-470MHz, 450-527MHz)
MD78X (G)
VHF(136-174MHz), UHF(400-470MHz, 450-520MHz,350-400MHz)
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4. XPT Features
Voice call
Private call
Group call
All call
Emergency call
Polite access
Telephone call *
Supplementary call
Alert call
Remote monitor
Radio enable/disable
Radio check
Emergency alarm
General features
Scan
Access limitation
Interference detection *
Fault tolerance
RDAC
Encryption*
Roaming*
Data operation
TMS
RRS/GPS
Quick GPS *
Dedicated data revert *
Dispatcher features
RRS/GPS
OTAP *
PSTN/PABX *
Voice recording *
Note: Items with * will be available in XPT R2.0.
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5. XPT Technology Performance
The main technology specifications of XPT system are listed below:
The channel capacity of XPT system is 8 times as large as Hytera digital conventional
communication system.
The number of traffic channel can be extended to 16 (8 x 2 Time Slots).
Support up to 14 dedicated data revert channels
Support up to 65535 radios
Radio ID range from 1 to 65535, group ID from 1 to 249, emergency group ID from
250-254, and all call ID is 255.
A radio can only make a group call which is pre-defined in the master repeater.
Support polite access
Priority for emergency call and all call.
When queuing, a radio continues monitoring all the slots of repeaters until finding an
idle traffic channel so that it can make a call.
The system integrates audio and data application, such as GPS, text message,
telemetry.
Support Hytera remote diagnostic and control (RDAC) program to ensure the
performance of system.
Only through software upgrade, the existing Hytera conventional system can be
migrated to XPT system smoothly.
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6. XPT Applications
6.1 XPT System with Hytera RDAC
Hytera RDAC (Repeater Diagnostics and Control) is a PC-based application designed for
monitoring and controlling all repeaters registered in the XPT system.
In XPT site, XPT repeaters are connected to each other via one switch, and then
connected to local RDAC client (PC installed with RDAC software) via switch or
connected to remote RDAC client through WAN via router, so as to make sure that the
users can diagnose and control each repeater via RDAC at any time in any place.
Figure 5: XPT system with Hytera RDAC
6.2 XPT System with SmartDispatch
SmartDispatch is an integrated and modular dispatch system based on the Client/Server
architecture, which facilitates the construction of a complex dispatch system. It consists
of the SmartDispatch Client, SmartDispatch Gateway, SmartDispatch Server, repeater,
dispatch station and radio. SmartDispatch provides capabilities such as radio dispatch,
GPS location, telephone interconnection, text and voice communication, making the
dispatching process most efficient.
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In XPT site, XPT repeaters are connected to each other via one switch, and the mobile
radio is connected to third-party application server via switch. Third-party server sends
the dispatch command to the repeater via mobile radio, and then the repeater repeats the
command to the corresponding target radios.
Figure 6: XPT system with Dispatcher of Mobile Radio
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7. Advantages of XPT System
XPT system is a special and low cost two-way radio solution, which can help enterprises
to perform key business communication in large capacity swiftly and efficiently. Also, it
can provide reliable digital technology and possess advantages of traditional trunking
system.
7.1 Maximizing the Capacity
The most difficult problem of digital conventional system is that one radio can only use
one channel of the repeater at any time. But XPT system has solved this problem. By
sharing the logic channels of the repeater, XPT system allows the radio to communicate
in all repeaters in the site. There is no need for specific control channels, thus the
channel utilization is increased.
XPT system can effectively extend and increase the communication capacity of Hytera
conventional system. By integrating the logic channels of multiple repeaters which are
operating under digital repeating mode in the same zone and without dedicated control
channels, XPT system can meet USA FB8 Frequency allocation rule and share its
frequency allocation with other systems. One XPT Single-site system can support eight
repeaters at most. Each repeater can be used as voice sharing channel or dedicated
data channel, with a total number of 16 logic channels. Theoretically, XPT system can
support up to 16 voice channels or data channels simultaneously. It is eight times of the
capacity of Hytera digital conventional communication system. Each XPT system can
support digital communication of up to 1200 users with a general traffic mode.
Figure 7: Traditional Repeater Communication
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Figure 8: XPT Single-site System Communication
7.2 Extending the System Cost-efficiently
XPT system is based on Hytera digital conventional system. The original system can be
upgraded by software only. There is no need for new controllers and the existing
duplexers can be used repeatedly. The building cost of XPT system is relatively low. This
system can extend the system capacity at a maximum level with low investment. By
utilizing the existing channel resource, XPT system can rapidly transmit key business
information when loading medium amount of calling users. The existing Hytera
conventional system can be transited smoothly into XPT system by license and software
upgrading. XPT system supports Hytera PD6 and above series portable radios, MD6 and
above series mobile radios, X1 series portable radios and RD98XS repeater without
extra requirements.
7.3 Providing Outstanding Functions and Flexibility
XPT system can provide different function supports for 65535 users per their actual
needs via 16 logic channels. XPT system can meet the enterprise communication needs
flexibly by integrating and utilizing these logic channels. Also, it possesses the
advantages and functions of conventional system, providing higher capacity and
frequency efficiency, integrated data communication and enhanced voice
communication, such as voice services (private call, group call, all call and emergency
call), data services (text message, work order and GPS) and advanced functions (scan,
fault tolerance, system authentication, alert call and remote monitoring).
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XPT system can also be compatible with phone system, dispatching system and RDAC
software of repeater for enhanced flexibility.
XPT system can be connected to phone system via PSTN gateway or PBX network,
allowing the radio to make and receive phone calls.
XPT system can support Hytera Repeater Diagnosis and Control application. RDAC
is a computer software developed by Hytera, which is used to monitor the repeater
status to ensure proper operation.
XPT system can be used with Smart Dispatch. Smart Dispatch is a voice monitoring
and recording software developed by Hytera, which is used to realize real-time
monitoring over the whole Hytera system.
Note: Connection with phone system feature will be available in XPT R2.0.
7.4 Improving Fault-tolerance Performance
XPT system can avoid interference caused by abnormal situations using fail soft mode
and interference detection. With these two functions, interference caused by abnormality
can be reduced and XPT system can keep operating.
Fail Soft Mode: XPT system is a distributed trunking system. It has no controlling center,
thus the system can tolerate certain failure. XPT system can automatically detect most of
the failure, such as abnormal auto detection, physical connection break-up, network card
looseness, network off-line, exchange abnormality or router abnormality. XPT system will
deal with different failures according to actual situation to weakening the adverse
impacts, so as to ensure that the repeater can still work when it is in fail soft mode. When
the abnormal problem is solved, the repeater will exit fail soft mode and support XPT services
again.
Interference detection: The up-link signals of repeater may be interfered by other
signals. For example, when the up-link signal of common-frequency is interfered, the
radio under this repeater may not be able to use the communication channel. The free
repeater in XPT system can detect the up-link signals via corresponding mechanisms.
When up-link signal interference is detected, XPT system will assign other repeater as
the new free repeater and inform the radios in the system to switch to the new repeater
for monitoring. Thus, the transmitting and receiving of radio services will not be affected.
Note: XPT Interference detection will be available in later version. Please refer to
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Feature List released by Hytera for more information.
7.5 Balancing System Communication Load
Load balancing technology is introduced into XPT system, which can balance the activity
groups to different home repeater, so as to reduce the call conflict rate at a same
repeater and to increase the successful rate of call set-up. It becomes more and more
important to use load balancing technology to automatically allocate activity groups and
to improve the system advantages when there are more and more repeaters in a same
site. With this technology, XPT system can support more calls at one time, and the loss
of call rate is far less than conventional system when the user number is the same.
7.6 Reducing Conflicts via Handshaking Mechanism
XPT system use the mechanism “Request and Permit” to allocate the channels. Before
initiating a call, the radio will perform data handshake with the repeater, so as to ensure
that the call is accessed to the valid channel. When the data handshake between the
radio and the master repeater is failed, the radio will request to perform data handshake
with free repeater. Only after the handshake is successful, the radio can transmit voice
services and data services on this free repeater. The advantage of data handshake is
that, it can ensure the handshake will not cause the radio to stay on a wrong channel due
to call conflict. Also, it can prevent interference from a radio with strong signal to other
radio using the same channel.
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8. Summary
XPT digital trunking system is solely developed by Hytera, providing practical, costefficient and smart channel sharing solution. It can help the enterprises to perform key
business communication of large capacity swiftly and efficiently with low building cost,
load balancing technology and without special control channels. After successful
application, XPT system will improve the work efficiency, working manner and
cooperation of the enterprises. XPT system is suitable for industries and departments
such as public security (police department, firefighting, army, etc.), manufacturing,
utilities, hotel, forestry, airport, pier, oil and gas production management; also, it is
suitable for dispatching communication in emergency situations such as rescue and relief
work. XPT system is an important communication system to safeguard social stability
and production safety, to provide better working efficiency and to reduce damage loss.
Hytera, a leading designer and manufacturer of professional mobile radio
communications equipment, is dedicated to bringing the most valuable and customized
solutions to clients across the world.
We offer complete and customized communication solutions to government, public
security, utility, transportation, enterprise & business for higher organizational efficiency.
Founded in 1993 in Shenzhen, China, Hytera has grown to be a key player in PMR
(Professional Mobile Radio) communication industry with a large customer base in more
than 80 countries and regions across the world. In China, Hytera's market share ranks
the 2nd, the 1st among Chinese manufacturers; globally Hytera has reached the 2nd in
Overall Terminal category 2.
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