ETSI ETR 300-2 ed.1 (1997-05)
Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Designers' guide; Part 2: Radio channels, network protocols and service performance
Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Designers' guide; Part 2: Radio channels, network protocols and service performance
DTR/TETRA-01011-2
Prizemni snopovni radio (TETRA) - Govor in podatki (V+D) - Navodilo za načrtovanje - 2. del: Zmogljivosti radijskih kanalov, omrežnih protokolov in storitev
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2001
3UL]HPQLVQRSRYQLUDGLR7(75$*RYRULQSRGDWNL9'1DYRGLOR]D
QDþUWRYDQMHGHO=PRJOMLYRVWLUDGLMVNLKNDQDORYRPUHåQLKSURWRNRORYLQ
VWRULWHY
Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Designers' guide; Part 2:
Radio channels, network protocols and service performance
Ta slovenski standard je istoveten z: ETR 300-2 Edition 1
ICS:
33.070.10 Prizemni snopovni radio Terrestrial Trunked Radio
(TETRA) (TETRA)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
ETSI ETR 300-2
TECHNICAL May 1997
REPORT
Source: EP-TETRA Reference: DTR/TETRA-01011-2
ICS: 33.020
Key words: TETRA, V+D, voice, data
Terrestrial Trunked Radio (TETRA);
Voice plus Data (V+D);
Designers' guide;
Part 2: Radio channels, network protocols and service
performance
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.fr
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1997. All rights reserved.
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ETR 300-2: May 1997
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.
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ETR 300-2: May 1997
Contents
Foreword .7
Introduction.7
1 Scope .9
2 References.9
3 Abbreviations.9
4 Radio channels performance .10
4.1 Introduction .10
4.2 Radio channels simulation description .10
4.3 Performance of signalling channels.14
4.3.1 AACH .16
4.3.1.1 Ideal synchronization technique.16
4.3.1.2 Realistic synchronization technique.18
4.3.2 SCH / HU.19
4.3.2.1 Ideal synchronization technique.19
4.3.2.2 Realistic synchronization technique.21
4.3.3 SCH/HD, BNCH and STCH.22
4.3.3.1 Ideal synchronization technique.22
4.3.3.2 Realistic synchronization technique.22
4.3.4 SCH/F.22
4.3.4.1 Ideal synchronization technique.22
4.3.4.2 Realistic synchronization technique.25
4.3.5 BSCH .25
4.3.5.1 Ideal synchronization technique.25
4.4 Performance of traffic channels.28
4.4.1 TCH/7,2.30
4.4.1.1 Ideal synchronization technique.30
4.4.1.2 Realistic synchronization technique.33
4.4.2 TCH/4,8 N = 1 .33
4.4.2.1 Ideal synchronization technique.33
4.4.2.2 Realistic synchronization technique.36
4.4.3 TCH/4,8 N = 4 .36
4.4.3.1 Ideal synchronization technique.36
4.4.3.2 Realistic synchronization technique.39
4.4.4 TCH/4,8 N = 8 .39
4.4.4.1 Ideal synchronization technique.39
4.4.4.2 Realistic synchronization technique.42
4.4.5 TCH/2,4 N = 1 .42
4.4.5.1 Ideal synchronization technique.42
4.4.5.2 Realistic synchronization technique.45
4.4.6 TCH/2,4 N = 4 .45
4.4.6.1 Ideal synchronization technique.45
4.4.6.2 Realistic synchronization technique.48
4.4.7 TCH/2,4 N = 8 .48
4.4.7.1 Ideal synchronization technique.48
4.4.7.2 Realistic synchronization technique.51
5 Access protocols and service performance of TETRA V+D network.51
5.1 Introduction .51
5.2 General description of traffic scenarios .51
5.2.1 Introduction.51
5.2.2 Reference traffic scenarios .51
5.3 General description of network model .53
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ETR 300-2: May 1997
5.3.1 Introduction . 53
5.3.2 General assumptions on communication layers. 54
5.3.3 Mobile user . 56
5.3.4 MS . 57
5.3.5 Switching and Management Infrastructure (SwMI). 59
5.3.5.1 Switching infrastructure. 59
5.3.5.2 Network data base . 60
5.3.6 External network . 60
5.3.7 Radio channels . 60
5.3.7.1 Power level of wanted signal. 61
5.3.7.2 Noise power . 63
5.3.7.3 Interference power . 63
5.3.7.4 Global evaluation . 63
5.3.7.5 Transmission on a dedicated timeslot . 63
5.3.7.6 Simultaneous transmissions for random access . 64
5.4 Description of evaluated parameters . 64
5.5 Access protocols and packet data performance. 67
5.5.1 Introduction . 67
5.5.2 Scenario 1: Urban and sub-urban PAMR network. 67
5.5.2.1 Introduction . 67
5.5.2.2 Simulation assumptions for Scenario 1. 68
5.5.2.2.1 Simulated traffic scenario. 68
5.5.2.2.2 Simulated network procedures and
reference access parameters . 69
5.5.2.2.3 Confidence analysis for scenario 1
results. 71
5.5.2.3 Influence of network data base delays. 71
5.5.2.4 Main control channel allocation. 79
5.5.2.4.1 Single MCCH. 79
5.5.2.4.2 Multiple MCCH . 85
5.5.2.5 Sensitivity to access control parameters and system
configuration. 87
5.5.2.5.1 Reference configuration. 87
5.5.2.5.2 Influence of random access retry timer 89
5.5.2.5.3 Influence of random access maximum
number of re-transmissions (Nu) . 94
5.5.2.5.4 Influence of random access frame
length. 99
5.5.2.5.5 Influence of basic link maximum
number of re-transmissions . 104
5.5.2.5.6 Influence of random access technique109
5.5.3 Scenario 8: Urban and sub-urban PMR network. 114
5.5.3.1 Introduction . 114
5.5.3.2 Simulation assumptions for Scenario 8. 115
5.5.3.2.1 Simulated traffic scenario. 115
5.5.3.2.2 Simulated network procedures and
reference access parameters . 116
5.5.3.2.3 Confidence analysis for scenario 8
results. 118
5.5.3.3 Reference configuration for scenario 8 (scenario 8A) . 118
5.5.3.4 Analysis of the system with different traffic profiles . 123
5.5.3.4.1 Variation of packet data traffic. 123
5.5.3.4.2 Variation of Dispatcher traffic level. 129
5.5.3.4.3 Analysis of different service priorities
distributions . 136
5.5.3.4.4 Analysis with full duplex circuit calls. 143
5.5.3.5 Sensitivity analysis of network parameters . 147
5.5.3.5.1 Variation of the cell allocated radio
resources . 147
5.5.3.5.2 Variation of the maximum hold time in
the priority queues. 152
5.6 Circuit services performance (BER versus probability). 155
5.6.1 Introduction . 155
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ETR 300-2: May 1997
5.6.2 Performance in TU propagation environment .155
5.6.3 Performance in BU propagation environment .157
5.6.4 Performance in RA propagation environment .159
5.6.5 Performance in HT propagation environment .162
Annex A: Traffic scenarios for TETRA V+D networks.164
A.1 Introduction.164
A.2 Scenarios .164
A.2.1 Scenario n. 1: Urban & sub-urban public network on a medium density European city .165
A.2.2 Scenario n. 2: Urban & sub-urban public network on a high density European city, with
ring motorways and peripheric conglomerations .166
A.2.3 Scenario n. 6: Urban & sub-urban private network on a medium density European city
for utility services .167
A.2.4 Scenario n. 8: Urban and sub-urban private network on a high density European city,
with peripheric conglomerations, for emergency services.169
Annex B: Message Sequence Charts (MSCs) of the simulated procedures.171
B.1 Individual voice or circuit data call.171
B.1.1 Calling MS and SwMI protocol stack related to the calling part.171
B.1.2 Called MS and SwMI protocol stack related to the called part.171
B.2 Group voice and circuit data call .174
B.2.1 Calling mobile and SwMI in the calling side.174
B.2.2 SwMI at called side and called mobile.174
B.3 Individual M-F short data transmission .177
B.3.1 Mobile to network data transmission .177
B.3.2 Network to Mobile data transmission.177
Annex C: Service Diagrams related to the model of Mobile user .180
C.1 General description of the model of the TETRA user .180
Annex D: Service Diagrams related to the MS .181
D.1 Random access procedure. .181
D.2 Individual voice and circuit data call .183
D.2.1 Originating mobile side .183
D.2.2 Terminating mobile side.183
D.3 Group voice and circuit data call .185
D.3.1 Originating mobile side .185
D.3.2 Terminating mobile side.185
D.4 Packet data call.187
D.4.1 Originating mobile side .187
D.4.2 Terminating mobile side.187
Annex E: Service diagrams related to the SwMI. .190
E.1 Individual voice and circuit data call .190
E.1.1 Calling side SwMI .190
E.1.2 Called side SwMI .190
E.2 Group voice and circuit data call .193
E.2.1 Calling side SwMI .193
E.2.2 Called part SwMI.193
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E.3 Packet data call . 196
E.3.1 Calling side SwMI. 196
E.3.2 Called side SwMI. 196
History. 199
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Foreword
This ETSI Technical Report (ETR) has been produced by the TErrestrial Trunked RAdio (TETRA) ETSI
Project of the European Telecommunications Standards Institute (ETSI).
ETRs are informative documents resulting from ETSI studies which are not appropriate for European
Telecommunication Standard (ETS) or Interim European Telecommunication Standard (I-ETS) status. An
ETR may be used to publish material which is either of an informative nature, relating to the use or the
application of ETSs or I-ETSs, or which is immature and not yet suitable for formal adoption as an ETS or
an I-ETS.
This ETR consists of 4 parts as follows:
Part 1: "Overview, technical description and radio aspects";
Part 2: "Radio channels, network protocols and service performance";
Part 3: "Direct Mode Operation (DMO)", (DTR/TETRA-01011-3);
Part 4: "Network management".
Annex A provides details of the traffic scenarios for TETRA V+D systems.
Annex B provides Message Sequence Charts (MSCs) of all the simulated procedures.
Annexes C, D and E provide Service Diagrams (SDs) related to the various models. As these diagrams
are difficult to read for each diagram a computer file name is provided of the attached electronic files to
this ETR. The diagrams provided in this way allows the reader to use suitable software to browse the
computer files.
A number of major contributions have been made by ETSI members in order for this ETR to be
comprehensive, and in order that scenario implementations are validated. EPTETRA wishes to
acknowledge the work of these contributions from:
- AEG Mobile Communications Gmbh, Ulm, (D);
- ASCOM TECH. AG, Maegenwil, (CH);
- CSELT S.p.A., Torino, (IT);
- Telecom Consultant International Ltd., (UK);
- TELEDENMARK, Taastrup, (DK); and
- The UK Home Office, London (UK).
Introduction
The design of a mobile radio network is a complex process where many parameters play an important
role.
The starting point of this process is the estimate of the traffic that is offered to the network. For a single
mobile subscriber, the type of required services, the frequency of requests, the duration and the minimum
performance are the common variables that are considered in the estimate. Moreover the number of
subscribers and their distribution inside the network allow the estimation of the total amount of traffic.
A parallel operation is the investigation of the propagation environment in the region where the network
will be placed.
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ETR 300-2: May 1997
The cell positioning and dimensioning is a crucial step in the design process. More than the amount of the
offered traffic and of the propagation environment, an important role is played by the knowledge of how
the design choices affect the performance for the offered services. This information is strongly related to
the particular radio interface of the mobile radio system.
The positioning and dimensioning of network switches and databases close the overall process. As in the
case of radio interface, this operation requires the knowledge about the influence of the design choices on
the overall performance.
The design process is usually iterative. A final analysis on the whole network allows to check the validity of
the process. In case of inadequate result, the process is repeated.
The evaluation of effects of the design choices on the overall network performance is usually performed
by simulation (nevertheless, when some network have been deployed, it can be done also through real
experiment).
This evaluation should allow the designer to determine the radio coverage and the resource allocation just
starting from the target performance for the provided services. Due to the complex structure of a mobile
network this operation is usually made by iterations. Starting from the network configuration, the overall
performance are evaluated, then the comparison with the target performance can lead to accept or to
repeat the evaluation with different parameters.
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ETR 300-2: May 1997
1 Scope
The scope of this ETSI Technical Report (ETR) is to be a useful, but not exhaustive, basis to a network
designer for the cell planning and radio resource allocation during the design process. This ETR reports
the performance of a TErrestrial Trunked RAdio (TETRA) Voice plus Data (V+D) network in some
different scenarios.
All the presented results have been evaluated through computer simulations by some companies taking
part in the TETRA standardization bodies. The network users involved in the development of the TETRA
standard provided some realistic and significant network scenarios, giving information about the offered
traffic.
The characterization of radio channels is the first step for the evaluation of performance of both network
protocols and quality of provided services. This ETR starts with the description and the illustration of
performance of TETRA V+D radio channels, in terms of Bit Error Ratio (BER) and Message Erasure Rate
(MER) as function of the Signal-to-Noise Ratio (SNR) and Carrier on co-channel Interference ratio (C/I).
This ETR also deals with the performance of network protocols (in terms of delay and throughput) and of
provided services (BER for circuit switched services and delay plus throughput for packet switched
services). A consequence of the analysis of access protocols is the evaluation of traffic capacity of control
and traffic channels.
2 References
For the purposes of this ETR, the following references apply.
[1] ETS 300 392-1: "Radio Equipment and Systems (RES); Trans-European
Trunked Radio (TETRA) system; Voice plus Data; Part 1: General network
design".
[2] ETS 300 392-2: "Radio Equipment and Systems (RES); Trans-European
Trunked Radio (TETRA) system; Voice plus Data; Part 2: Air Interface".
[3] CEC Report COST 207: "Digital Land Mobile Communications".
3 Abbreviations
For the purposes of this ETR, the following abbreviations apply:
AACH Access Assign CHannel
BER Bit Error Rate
BNCH Broadcast Network CHannel
BSCH Broadcast Synchronization CHannel
BUx Bad Urban at x km/h
C/I Carrier on co-channel Interference ratio
c
CC Call Control
CONP Connection Oriented Network Protocol
E /N Signal on Noise ratio
s 0
HH Hand Held
HTx Hilly Terrain at x km/h
LLC Logical Link Control
MAC Medium Access Control
MCCH Main Control CHannel
MER Message Erasure Rate
MLE Mobile Link Entity
MS Mobile Station
MSC Message Sequence Chart
MT Mobile Terminal
PAMR Public Access Mobile Radio
PDO Packet Data Optimized
PDU Protocol Data Unit
PMR Private Mobile Radio
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ETR 300-2: May 1997
PUEM Probability of Undetected Erroneous Messages
RAx Rural Area at x km/h
RES Radio Equipment and Systems
SCH / F Signalling CHannel / Full slot
SCH / HD Signalling CHannel / Half slot Downlink
SCH / HU Signalling CHannel / Half slot Uplink
SCLNP Special Connection Less Network Protocol
SDL Specification and Description Language
SDU Service Data Unit
SwMI Switching and Mobility Infrastructure
TCH/x N=y Traffic CHannel for x kbit/s and interleaving depth N=y
TCH// S Traffic CHannel / Speech
TDMA Time Division Multiple Access
TETRA TErrestrial Trunked RAdio
TUx Typical Urban at x km/h
V+D Voice plus Data
4 Radio channels performance
4.1 Introduction
Performance of TETRA V+D logical radio channels are reported in this clause. They have been evaluated
through computer simulations for all the propagation environments that are modelled in
ETS 300 392-2 [2], clause 6. Moreover, performance are also reported for some values of the Mobile
Station (MS) speed in each propagation environment.
Radio channel figures are preceded by the description of the model of radio channels and of the
assumptions that have been considered for simulations. Then, for each channel, performance figures are
grouped and showed in the following order:
- comparison among different propagation environments with one value of MS speed per
environment;
- performance sensitivity to the MS speed in TU propagation environment;
- performance sensitivity to the MS speed in BU propagation environment;
- performance sensitivity to the MS speed in RA propagation environment;
- performance sensitivity to the MS speed in HT propagation environment.
Due to the different possibilities in the model of the radio receiver, two groups of simulations have been
carried out:
1) the first with ideal synchronization technique; and
2) the second with a particular implementation of the synchronization block.
In this ETR performance figures are distinguished in two subclauses for each channel and scenario.
Figures that are reported in this clause will be considered as the basis for the evaluation of network
protocol and traffic performance, presented in the following clauses.
4.2 Radio channels simulation description
Each of the TETRA V+D logical channels has been defined in order to exploit particular data
transmissions (protocol messages or user data) over the radio interface. In order to match the
requirements related to throughput and error rate, each channel has been designed with a suitable coding
scheme. The complete description of logical channels is found in ETS 300 392-2 [2], clause 8.
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ETR 300-2: May 1997
On the basis of their usage in the system, the logical channels can be divided in two main groups:
- Signalling channels:
All signalling messages and packet switched user data are carried on these channels. Error
detection and error correction coding schemes are applied on transmitted messages. Moreover for
these applications it is required that corrupted messages are discarded in order to not cause
erroneous state transitions. The coding schemes of TETRA V+D channels have been designed in
order to minimize the probability that an erroneous message is not detected (PUEM). According to
ETS 300 392-2 [2], PUEM < 0,001 % is obtained for all signalling channels with the exception of
AACH (PUEM < 0,01 %). Due to the usage of these channels, the measured performance is the
MER.
- Traffic channels:
Speech frames and circuit switched user data are carried on traffic channels. Error detection and
error correction coding schemes are applied on transmitted data. No discarding mechanism is
performed on traffic channels with the exception of the TCH/S. Before entering the speech decoder,
the speech frame is discarded if corrupted. For all the other traffic channels received data are
presented to the user application even if corrupted. In general, it is significant that the measured
performance for traffic channels is the BER. Due to the particular design of the TCH/S channel, its
performance is measured in terms of both MER and residual BER (that is the BER detected on
speech frames that are not discarded).
Table 1 summarizes the main characteristics of TETRA V+D logical channels and indicates the evaluated
performance.
Table 1: Summary of logical channels characteristics.
Logical Channel Direction Physical Category Evaluated
resource performance
AACH Downlink 30 initial bits of Signalling MER
downlink
timeslot
SCH/HD, BNCH and Downlink Half slot Signalling MER
STCH
Uplink Half slot Signalling MER
SCH/HU
BSCH Downlink Full slot Signalling MER
SCH/F Uplink / Downlink Full slot Signalling MER
Uplink / Downlink Full slot Traffic (Speech) MER,
TCH/S
residual BER
TCH/7,2 Uplink / Downlink Full slot Traffic (Data) BER
Uplink / Downlink Full slot Traffic (Data) BER
TCH/4,8 (N=1, 4, 8)
TCH/2,4 (N=1, 4, 8) Uplink / Downlink Full slot Traffic (Data) BER
A further element of distinction is the transmission mode of a channel: uplink, discontinuous downlink and
continuous downlink. Traffic channels and the SCH/F allow all these modes. The difference is the type
and the number of training sequences inserted in the transmitted radio bursts.
Radio receiver simulations have been performed according to the model represented in figure 1.
The transmitter has been modelled according to the standard scheme given in ETS 300 392-2 [2],
clause 4.
The structure of the radio receiver is not covered by the standard. The model given in figure 1 is a general
scheme that is commonly accepted. Some of the receiver blocks are the mirror counterpart of others on
the transmitter (root raised cosine filter, demodulator, differential decoder, burst splitter, de-scrambler and
de-interleaver). Nevertheless the structure of the other blocks is dependent from the implementation; it is
the case for synchronization and timing recovery block and for the decoder.
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ETR 300-2: May 1997
The decoder block has been realized according to the “soft” decision Viterbi algorithm, with path length =
message length.
The synchronization and timing recovery block can be realized according to different schemes. For this
reason simulations have been performed according to the two following synchronization techniques:
- ideal technique:
- the local timing system of the receiver is perfectly aligned to the received TDMA frames;
- realistic implementation of the synchronization technique:
- one realization of synchronization technique has been implemented; this technique exploits
correlation properties of the training sequences defined in the standard in order to evaluate
burst and symbol synchronization.
The physical radio channels have been modelled according to ETS 300 392-2 [2], clause 6.
At the top of figure 1 two blocks have been introduced in order to evaluate the radio channel
characteristics.
In the case of signalling channels and TCH/S simulations, accepted and discarded Medium Access
Control (MAC) blocks are counted. The evaluated MER is given by the ratio between discarded MAC
blocks and the total of transmitted blocks.
In the case of traffic channels a comparison between transmitted and correspondent received bits allows
the evaluation of the total amount of erroneous received bits. The evaluated BER is given by the ratio
between the number of erroneous bits and the total number of transmitted bits.
The number of training sequences that is transmitted inside radio bursts may influence the behaviour of
the synchronization and timing recovery block, depending on its particular implementation. In the case of
ideal synchronization technique there is no influence. In the case of realistic synchronization algorithms
implementations without equalizer, the impact of the number of training sequences on radio performance
is negligible if compared to the case of receiver with equalizer.
The radio receiver that has been simulated does not make use of equalizers. As a consequence, in the
case of traffic channels and SCH/F, performance related to uplink, discontinuous downlink and continuous
downlink transmission modes will be considered without distinction.
Radio channel performance have been evaluated as functions of E /N or C/I at the antenna connector of
s 0 c
the receiver. E is the energy associated to a modulation symbol, N (one-sided noise power spectral
s 0
density) is the energy of electric noise related to the modulation symbol period and due to other
phenomena than TETRA transmissions; in actual simulations it will be only related to thermal noise; C is
the transmitted power associated to the modulation symbol; I is the power associated to a pseudo-
c
random continuous TETRA modulated signal that takes place on the same frequency (co-channel
interference) of the useful signal. The figures of the channels show that the influence of E /N on channel
s 0
performance is similar to the influence of C/I . Differences between curves are less than 1 dB for the
c
same performance level.
Due to the differences in the synchronization technique, two groups of results are presented for each
logical channel. Performance of each synchronization technique is evaluated for different propagation
scenarios (TU, BU, RA, HT) and considering different values of the mobile terminal speed.
The two groups of results in this ETR have to be considered as a sort of performance boundaries. For
each simulation scenario real receivers are reasonably expected to have performance within the range
limited by the evaluated curves for the two synchronization techniques.
Results of simulations obtained from different companies show a good agreement. Radio channel
performance in this ETR have been evaluated as an average of available homogeneous simulation results
from different companies.
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ETR 300-2: May 1997
Making reference to figure 1, and according to the previous assumptions, simulations have been
performed according to the following assumptions:
- ideal transmitter:
- all blocks in the transmitter have an ideal behaviour as described in ETS 300 392-2 [2];
- ideal RF receiver:
- the RF to baseband signal conversion is considered ideal;
- 400 MHz carrier frequency;
- analysis of performance versus E /N and C/I ;
s 0 c
- class B receiver:
- radio channel simulations in this clause are performed to meet class B receiver requirements
as defined in ETS 300 392-2 [2]:
- better performance is expected to be given by a receiver with an equalizer block;
- 10 000 MAC blocks per simulation point:
- each simulated point has been evaluated on a set of 10000 MAC blocks;
- ideal and realistic synchronization technique:
- when available two groups of performance are reported for each logical channel, one for
ideal synchronization technique, the other for realistic technique;
- soft decision Viterbi decoder with path length = message length.
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ETR 300-2: May 1997
UNCODED DATA
BIT C O M PAR ATO R
(Traffic Channels)
ERRONEOUS
MAC B LO C KS
CO UNTER
(S ignalling Channels)
ENCODER DECODER
INTERLEAVER
D EINTE R LEAV ER
SCRAMBLER DESCRAM BLE R
BURST BUILDER BURST SPLITTER
D IFFER EN TIAL
D IFFER EN TIAL
ENCO DER DECODER
MOD ULA TO R DEM ODULATO R
SYNCHRO NIZATIO N
RO OT RAISED
and
CO SINE FILTE R
TIMING RECOVERY
ROOT RAISED
R F TR AN S M ITTER
COSINE FILTER
RF RECE IV ER
FAD ING
ΣΣ
SIM U LA TO R
AW G N
or
IN T E R F E R E R
TRANSMITTER RADIO CH AN NEL RECEIVER
Figure 1: Schematic diagram of the model for the simulation of a generic TETRA V+D logical
channel
4.3 Performance of signalling channels
Signalling channels are devoted to the transmission of signalling and packet data messages on the air
interface. For this kind of applications it is important that each received burst is decoded without errors or
discarded.
For these channels the simulations evaluate the probability for the received message to be discarded, the
MER. Simulations have been performed for different combinations of propagation environments and MS
speed.
Table 2 summarizes the performance that has been evaluated for all channels and associates them to the
figures in the document.
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ETR 300-2: May 1997
Table 2: Summary of document figures that report signalling channel performance
Logical Figure Description
channel numbers
AACH Figure 2 MER of AACH as function of E /N in TU50, BU50, RA200, HT200
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 3 MER of AACH as function of E/N in TU5, TU50, TU100
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 4 MER of AACH as function of E /N in BU50, BU100 propagation
s 0
(Ideal synch) environments with ideal synchronization technique
Figure 5 MER of AACH as function of E /N in RA5, RA50, RA100, RA200
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 6 MER of AACH as function of E/N in HT50, HT100 ,HT200
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 7 MER of AACH as function of E /N in TU50, BU50, RA50, RA200,
s 0
(Realistic HT50, HT200 propagation environments with realistic
synch) synchronization technique
SCH/HU Figure 8 MER of SCH/HU as function of E /N in TU50, BU50, RA200, HT200
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 9 MER of SCH/HU as function of E/N in TU5, TU50, TU100
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 10 MER of SCH/HU as function of E /N in BU50, BU100 propagation
s 0
(Ideal synch) environments with ideal synchronization technique
Figure 11 MER of SCH/HU as function of E /N in RA5, RA50, RA100, RA200
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 12 MER of SCH/HU as function of E /N in HT50, HT100, HT200
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 13 MER of SCH/HU as function of E /N in TU50, BU50, RA50, RA200,
s 0
(Realistic HT50, HT200 propagation environments with realistic
synch) synchronization technique
SCH/HD Refer Performance for these channels (all of them present the same
BNCH SCH/HU coding scheme) is the same of the channel SCH/HU
STCH (Figure 8 to
Figure 13)
SCH/F Figure 14 MER of SCH/F as function of E /N in TU50, BU50, RA200, HT200
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 15 MER of SCH/F as function of E/N in TU5, TU50, TU100
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 16 MER of SCH/F as function of E /N in BU50, BU100 propagation
s 0
(Ideal synch) environments with ideal synchronization technique
Figure 17 MER of SCH/F as function of E /N in RA5, RA50, RA100, RA200
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 18 MER of SCH/F as function of E/N in HT50, HT100, HT200
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 19 MER of SCH/F as function of E /N in TU50, BU50, RA50, RA200,
s 0
(Realistic HT50, HT200 propagation environments with realistic
synch) synchronization technique
BSCH Figure 20 MER of BSCH as function of E /N in TU50, BU50, RA200, HT200
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 21 MER of BSCH as function of E/N in TU5, TU50, TU100
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 22 MER of BSCH as function of E /N in BU50, BU100 propagation
s 0
(Ideal synch) environments with ideal synchronization technique
Figure 23 MER of BSCH as function of E /N in RA5, RA50, RA100, RA200
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Figure 24 MER of BSCH as function of E/N in HT50, HT100, HT200
s 0
(Ideal synch) propagation environments with ideal synchronization technique
Page 16
ETR 300-2: May 1997
4.3.1 AACH
4.3.1.1 Ideal synchronization technique
1.00E+00
TU50
BU50
RA200
HT200
1.00E-01
1.00E-02
1.00E-03
1.00E-04
0 2 4 6 8 101214 1618 202224 262830 32 343638 40
Es / N0
Figure 2: AACH performance in different propagation scenarios
1.00E+00
TU5
TU50
TU100
1.00E-01
1.00E-02
1.00E-03
1.00E-04
0 2 4 6 8 101214 1618 202224 262830 32 343638 40
Es / N0
Figure 3: Influence of MS speed on AACH in TU propagation environment
MER MER
Page 17
ETR 300-2: May 1997
1.00E+00
BU50
BU100
1.00E-01
1.00E-02
1.00E-03
1.00E-04
0 2 4 6 8 101214 1618 202224 262830 32 343638 40
Es / N0
Figure 4: Influence of MS speed on AACH in BU propagation environment
1.00E+00
RA5
RA50
RA100
RA200
1.00E-01
1.00E-02
1.00E-03
1.00E-04
0 2 4 6 8 101214 1618 202224 262830 32 343638 40
Es / N0
Figure 5: Influence of MS speed on AACH in RA propagation environment
MER MER
Page 18
ETR 300-2: May 1997
1.00E+00
HT50
HT100
HT200
1.00E-01
1.00E-02
1.00E-03
1.00E-04
0 2 4 6 8 101214 1618 202224 262830 32 343638 40
Es / N0
Figure 6: Influence of MS speed on AACH in HT propagation environment
4.3.1.2 Realistic synchronization technique
1.00E+00
TU50
BU50
HT50
RA50
HT200
RA200
1.00E-01
1.00E-02
1.00E-03
1.00E-04
0 2 4 6 8 1012 1416 182022 2426 2830
Es / N0
Figure 7: AACH performance in different propagation scenarios
MER MER
Page 19
ETR 300-2: May 1997
4.3.2 SCH / HU
4.3.2.1 Ideal synchronization technique
1.00E+00
TU50
BU50
RA200
HT200
1.00E-01
1.00E-02
1.00E-03
1.00E-04
0 2 4 6 8 101214 1618 202224 262830 32 343638 40
Es / N0
Figure 8: SCH/HU performance in different propagation scenarios
1.00E+00
TU5
TU50
TU100
1.00E-01
1.00E-02
1.00E-03
1.00E-04
0 2 4 6 8 101214 1618 202224 262830 32 343638 40
Es / N0
Figure 9: Influence of MS speed on SCH/HU in TU propagation environment
MER MER
Page 20
ETR 300-2: May 1997
1.00E+00
BU50
BU100
1.00E-01
1.00E-02
1.00E-03
1.00E-04
0 2 4 6 8 101214 1618 202224 262830 32 343638 40
Es / N0
Figure 10: Influence of MS speed on SCH/HU in BU propagation environment
1.00E+00
RA5
RA50
RA100
RA200
1.00E-01
1.00E-02
1.00E-03
1.00E-04
0 2 4 6 8 101214 1618 202224 262830 32 343638 40
Es / N0
Figure 11: Influence of MS speed on SCH/HU in RA propagation environment
MER MER
Page 21
ETR 300-2: May 1997
1.00E+00
HT50
HT100
HT200
1.00E-01
1.00E-02
1.00E-03
1.00E-04
0 2 4 6 8 101214 1618 202224 262830 32 343638 40
Es / N0
Figure 12: Influence of MS speed on SCH/HU in HT propagation environment
4.3.2.2 Realistic synchronization technique
1.00E+00
TU50
BU50
RA50
RA200
HT50
HT200
1.00E-01
1.00E-02
...








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