ETSI TS 144 014 V13.0.0 (2016-01)

ETSI TS 1144 014 V13.0.0 (201616-01)

TECHNICAL SPECIFICATIONION
Digital cellular telecocommunications system (Phahase 2+);
Individual equipment t type requirements and interterworking;
Special confnformance testing functions s
(3GPP TS 44.0.014 version 13.0.0 Release 13 13)

R
GLOBAL SYSTTEME FOR
MOBILE COMMUUNNICATIONS
3GPP TS 44.014 version 13.0.0 Release 13 1 ETSI TS 144 014 V13.0.0 (2016-01)

Reference
RTS/TSGG-0244014vd00
Keywords
GSM
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ETSI
3GPP TS 44.014 version 13.0.0 Release 13 2 ETSI TS 144 014 V13.0.0 (2016-01)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
http://webapp.etsi.org/key/queryform.asp.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
3GPP TS 44.014 version 13.0.0 Release 13 3 ETSI TS 144 014 V13.0.0 (2016-01)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 6
1 Scope . 7
1.1 Conventions . 7
2 References . 7
3 Definitions, conventions, and applicability . 8
3.1 Mobile station definition and configurations . 8
3.2 Applicability . 8
4 Activation and deactivation of special test functions in the MS . 8
5 Internal test loops . 9
5.1 Single-slot TCH loops . 10
5.1.1 Purpose of Single-slot TCH loops . 10
5.1.2 TCH loop including signalling of erased frames (A) . 10
5.1.2.1 Procedure . 10
5.1.3 Speech TCH loop without signalling of erased frames (B) . 12
5.1.3.1 Procedure . 12
5.1.4 TCH burst-by-burst loop (C) . 13
5.1.4.1 Applicability. 13
5.1.4.2 Procedure . 13
5.1.4.3 Establishment . 13
5.1.4.4 Operation . 13
5.1.5 TCH loop including signalling of erased frames and unreliable frames (D) . 14
5.1.5.1 Procedure . 14
5.1.6 TCH loop including signalling of erased SID frames (E) . 14
5.1.6.1 Procedure . 14
5.1.7 TCH loop including signalling of erased valid SID frames (F) . 15
5.1.7.1 Procedure . 15
5.1.7a TCH loop without signalling of erased frames for in-band channel error rate (I). 15
5.1.7a.1 Procedure . 15
5.1.8 Additional non-mandatory operating characteristics for single-slot loops . 16
5.2 Multi-slot TCH loops . 16
5.2.1 Purpose of Multi-slot TCH loops . 16
5.2.2 Multi-slot TCH burst-by-burst loop (G) . 17
5.2.2.1 Procedure . 17
5.2.3 Multi-slot TCH loop including signalling of erased frames (H) . 18
5.2.3.1 Procedure . 18
5.3 Deactivating loops . 18
5.3.1 Deactivating Single-slot TCH loops . 18
5.3.2 Deactivating Multi-slot TCH loops . 18
5.4 Multi-slot test mode for GPRS & EGPRS . 18
5.4.1 Initiation . 19
5.4.1.1 MS Declaration . 19
5.4.1.2 Establishment of uplink TBF . 19
5.4.2 Operation . 19
5.4.2.1 MS Operating in mode a) . 19
5.4.2.2 MS Operating in mode b) . 20
5.4.2.3 Operational constraints applying to both modes . 20
5.4.3 Termination. 20
5.4.4 PN Sequence Definition . 21
5.4.5 Optional Multi-slot operation . 21
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5.5 EGPRS Switched Radio Block Loopback Mode. 21
5.5.1 Initiation . 21
5.5.2 Operation . 22
5.5.3 Termination. 23
5.5.4 Support of EGPRS MS without 8PSK modulation capability in uplink . 23
5.5.5 Optional Multi-slot operation . 23
5.5.6 Support of EGPRS2-A MS . 24
6 Activating and deactivating EMMI . 24
7 Activating and deactivating DAI tests . 25
8 Message definitions and contents . 25
8.1 CLOSE_TCH_LOOP_CMD . 25
8.2 CLOSE_TCH_LOOP_ACK. 26
8.3 OPEN_LOOP_CMD . 26
8.4 CLOSE_Multi-slot_LOOP_CMD . 27
8.5 CLOSE_Multi-slot_LOOP_ACK . 27
8.6 OPEN_Multi-slot_LOOP_CMD . 28
8.7 OPEN_Multi-slot_LOOP_ACK . 28
8.8 Command for the activation of the EMMI, ACT_EMMI_CMD . 29
8.9 Acknowledge of the activation of the EMMI, ACT_EMMI_ACK . 29
8.10 Deactivation of the EMMI, DEACT_EMMI. 29
8.11 Test_Interface . 29
8.12 Timer values . 30
8.13 GPRS_TEST_MODE_CMD . 30
8.14 EGPRS_START_RADIO_BLOCK_LOOPBACK_CMD . 31
8.15 RESET MS POSITIONING STORED INFORMATION. 32
9 Electrical Man Machine Interface (EMMI) . 33
9.1 Use of the EMMI . 33
9.2 Formal aspects . 33
9.3 Layered structure of the interface . 33
9.4 Terminology . 33
9.5 Description of the EMMI . 34
9.5.1 EMMI, Layer 1 . 34
9.5.1.1 Mechanical and electrical characteristics . 34
9.5.1.2 Transmission and reception characteristics . 34
9.5.2 EMMI, layer 2 . 34
9.5.2.1 General structure . 34
9.5.2.2 Control frames . 34
9.5.2.3 Frame structure . 35
9.5.2.4 Flow of I-frames on layer 2 . 35
9.5.2.4.1 Transmission of frames . 35
9.5.2.4.2 Reception of frames . 35
9.5.2.4.3 Use of ACK and NAK on receiving side . 35
9.5.2.4.4 Use of XON and XOF . 36
9.5.2.4.5 Parameters on layer 2 . 36
9.5.3 EMMI, layer 3 . 36
9.5.3.1 Message structure . 36
9.5.3.2 Definition of messages . 37
10 Digital audio interface . 41
10.1 General . 41
10.2 Formal aspects . 41
10.3 Hardware aspect of the interface . 42
10.3.1 Mechanical characteristics of the interface . 42
10.3.2 Electrical characteristics of the interface . 42
10.3.3 Timing characteristics of the interface . 42
10.4 Logical interface . 43
10.5 Functionality of the DAI . 43
11 SIM/ME test interface . 44
11.1 General . 44
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11.2 Formal aspects . 44
11.3 Hardware and logical aspects of the interface . 44
11.4 Mechanical characteristics of the interface. 44
12 Reset MS Positioning Stored Information . 46
12.1 General . 46
12.2 Procedure . 46
13 GAN security certificate . 47
13.1 General . 47
13.2 Formal aspects . 47
Annex A (informative): Change History . 48
History . 49

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3GPP TS 44.014 version 13.0.0 Release 13 6 ETSI TS 144 014 V13.0.0 (2016-01)
Foreword
rd
This Technical Specification has been produced by the 3 Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
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3GPP TS 44.014 version 13.0.0 Release 13 7 ETSI TS 144 014 V13.0.0 (2016-01)
1 Scope
The present document specifies for Mobile Stations (MS), for the digital cellular communications system and Personal
Communication Systems (PCS) operating in the 900 MHz and 1800 MHz band (GSM900 and DCS1800), standardized
rd
by 3 Generation Partnership Project (3GPP), those ME functions which are required for conformance testing purposes
only. However, except for the Electrical Man Machine Interface (EMMI) and the Multi-slot TCH Loops, they are
required for every mobile station.
For conformance tests, functions are activated via the radio interface, test SIM or dedicated pins. These functions must
be capable of being activated when a test SIM is present but must not function with any other (e.g. network) SIM
present except where otherwise stated within the present document. In this state, the MS must be able to perform all
functions specified in the present document; in addition however, the special conformance testing functions must be
operational.
The special conformance testing functions of the ME are enabled by use of a dedicated Subscriber Identity Module (test
SIM, see 3GPP TS 51.010-1 Annex 4). SIM, in general, is described in 3GPP TS 51.011. The ME recognizes the test
SIM by the Administrative Data Field.
The present document applies to the public land mobile radio service in the GSM900 and DCS1800 systems, using
constant envelope modulation and operating on radio frequencies in the 900 and 1800 MHz bands respectively with a
channel separation of 200 kHz and carrying 8 full rate channels or 16 half rate channels per carrier according to the
TDMA principle.
The present document is part of the 3GPP TS series of technical specifications. The present document neither replaces
any of the other GSM technical specifications or GSM related TS, nor is it created to provide full understanding of (or
parts of) the GSM900 and DCS1800 systems.
The present document applies to the unit which includes the hardware to establish a connection across the radio
interface.
1.1 Conventions
Unless explicitly stated otherwise, the following conventions apply:
- "EGPRS" refers to "EGPRS and EGPRS2".
- "EGPRS2" refers to "EGPRS2-A and EGPRS2-B".
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] 3GPP TS 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TS 24.007: "Mobile radio interface signalling layer 3; General aspects".
[3] 3GPP TS 44.018: "Mobile radio interface layer 3 specification; Radio Resource Control Protocol".
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3GPP TS 44.014 version 13.0.0 Release 13 8 ETSI TS 144 014 V13.0.0 (2016-01)
[4] 3GPP TS 51.010: "Mobile Station (MS) conformity specification".
[5] 3GPP TS 51.011: "Specification of the Subscriber Identity Module - Mobile Equipment (SIM -
ME) interface".
[6] (void).
[7] 3GPP TS 34.109: "Logical Test Interface (FDD) Special conformance testing functions".
[8] 3GPP TS 22.101: "UMTS Service principles".
[9] 3GPP TS 45.010: "Radio subsystem synchronization".
[11] CCITT recommendation O.153 Fascicle IV.4, (Basic parameters for the measurement of error
performance at bit rates below the primary rate, Melbourne 1988)
3 Definitions, conventions, and applicability
For abbreviations and acronyms, see 3GPP TS 21.905.
3.1 Mobile station definition and configurations
In the present document, a MS can be:
- a vehicle mounted station;
- a portable station;
[10] 3GPP TS 44.060: "General Packet Radio Service (GPRS); Mobile Station (MS) - Base Station
System (BSS) interface. Radio Link Control/Medium Access Control (RLC/MAC) protocol".
- a handheld station;
- a vehicle mounted/portable station;
- a vehicle mounted/handheld station.
For a more detailed description of MS-configurations, see 3GPP TS 22.101.
3.2 Applicability
The present document is applicable to all MSs.
4 Activation and deactivation of special test functions in
the MS
The functions described in the present document can be activated and deactivated from a SS by sending appropriate
layer 3 commands to the MS. The protocol discriminator to be used is defined in 3GPP TS 44.018, sub-clause 10.2.
The layer 3 commands are sent on the DCCH. On layer 2, SAPI 0 is used in acknowledged mode.
Apart from sending the appropriate deactivation command to the MS the functions can be deactivated by switching off
the MS or removing the test SIM.
The following test functions can be activated (and deactivated):
- TCH Loop;
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3GPP TS 44.014 version 13.0.0 Release 13 9 ETSI TS 144 014 V13.0.0 (2016-01)
- TCH Burst-by-Burst Loop;
- Multi-slot Loop;
- Electrical MMI;
- Test via DAI.
- Reset MS Positioning Stored Information (activation only)
The TCH loops and the test via DAI are test functions which are mutually exclusive.
5 Internal test loops
A number of internal test loops are required providing access to isolated functions of the MS without introducing new
physical interfaces just for the reason of type approval testing. Fig 5-1 shows a functional block diagram of a reference
MS containing the different test loops.
NOTE: It should be emphasized that these test loops only describe the functional behaviour of the MS with
respect to its external interfaces; physical implementation of the loops is completely left open to the
manufacturer.
A particular loop is activated in an MS by transmitting the appropriate command message to the MS.
LLoooopp A/ A/B/B/DD//E/E/F/F/HH

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(D(Diiggiittalal A Auudidio o InteInterfrfaceace))

Figure 5: Test loops in the MS
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3GPP TS 44.014 version 13.0.0 Release 13 10 ETSI TS 144 014 V13.0.0 (2016-01)
5.1 Single-slot TCH loops
5.1.1 Purpose of Single-slot TCH loops
To establish a transparent loop for TCH blocks a TCH must be active between the SS and MS. The TCH may be full or
half rate, speech or data of any rate specified in the GSM system.
Seven types of Single-slot TCH loop back are defined.
1: The first (A) includes the signalling of erased frames and is used to determine Frame Erasure Ratio (FER) and
Residual Bit Error Ratio (RBER) for speech TCH and Bit Error Ratio (BER) for any data TCH.
In case of TCH/AFS, TCH/AHS, TCH/WFS, O-TCH/WFS and O-TCH/WHS, it also includes the signalling of
erased valid SID_UPDATE and RATSCCH frames and is used to determine Erased Valid SID_UPDATE Frame
Rate (EVSIDUR) and Erased Valid RATSCCH Frame Rate (EVRFR).
2: The second type (B) is required to determine Class II bit error ratio for the speech TCH.
3: With the third loop (C) the 114 information bits of each TCH burst (excluding stealing flags) prior to applying
benefit of the channel decoder, but after decryption, shall be transmitted in an uplink burst. (Equivalent error rate
to TCH/FS Class II). All that is received shall be re-transmitted regardless of the state of the received midamble.
The midamble in the uplink bursts shall be the normal midamble used by the MS. SACCH and idle bursts are not
looped back.
4: The fourth loop (D) includes the signalling of erased frames and unreliable frames and is used to determine
Unreliable Frame Ratio (UFR) and Residual Bit Error Ratio (RBER) for TCH/HS.
5: The fifth loop (E) includes the signalling of erased SID frames and is used to determine Erased SID Frame Rate
(ESIDR) and Residual Bit Error Ratio (RBER) for TCH/HS.
6: The sixth loop (F) includes the signalling of erased valid SID frames and is used to determine Erased Valid SID
Frame Rate (EVSIDR) and Residual Bit Error Ratio (RBER) for TCH/HS.
7: The seventh loop (I) is required to determine frame error rate for the in-band channel.:
- TCH-AFS-INB FER
- TCH-AHS-INB FER
- TCH-WFS-INB FER
- O-TCH/WFS-INB FER
- O-TCH/WHS-INB FER
NOTE: Measurement of TCH/FS chip BER is approximately five times faster using loop C rather than loop B.
5.1.2 TCH loop including signalling of erased frames (A)
5.1.2.1 Procedure
The SS orders the MS to close its TCH loop by transmitting a CLOSE_TCH_LOOP_CMD message, specifying the
TCH to be looped and that erased frames are to be signalled by the MS. The SS then starts timer TT01.
If no TCH is active, or any test loop is already closed, the MS shall ignore any CLOSE_TCH_LOOP_CMD message.
If a TCH is active, the MS shall close its TCH loop for the TCH specified and send back to the SS a
CLOSE_TCH_LOOP_ACK message. Upon reception of that message the SS stops timer TT01.
After the MS has closed its TCH loop, every good speech frame or any user data frame received by the MS on the
specified TCH (downlink) shall be taken from the output of the channel decoder, input to the channel encoder and
transmitted on the same TCH (uplink).
In the case where TCH is TCH/FS, the MS shall loop back the 260 bits after normal channel decoding.
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In the case where TCH is TCH/EFS, the MS shall loop back the 244 bits after normal and preliminary channel
decoding.
In the case where TCH is TCH/HS, the MS shall loop back the 112 bits after normal channel decoding.
In the case where a TCH/AFS, TCH/AHS, TCH/WFS, O-TCH/WFS or O-TCH/WHS is used, the MS shall loop back
the number of bits carried by the downlink speech frame, after normal channel decoding.
If the channel decoder detects a bad speech frame, then this shall be signalled to the SS by setting the input frame to the
channel encoder to zero's, and transmitting on the TCH (uplink).
For all TCH, except TCH/AFS, TCH/AHS, TCH/WFS, O-TCH/WFS or O-TCH/WHS, if the MS decodes stealing flags
as indicating an FACCH frame, then there is no defined response for the MS to the channel encoder for transmission on
the TCH (uplink). The FACCH channel shall operate as normal.
The following requirements apply when TCH is TCH/AFS, TCH/AHS, TCH/WFS, O-TCH/WFS or O-TCH/WHS:
- The Active Codec Set (ACS) may contain between one and four codec modes.
- When the ACS contains more than one codec mode then:
- The MS shall ignore the downlink codec mode commands received from the SS.
- The MS shall use for the uplink the codec mode used for the decoding of the DL speech frame being looped
back.
- The MS shall not generate or send codec mode requests. All in band signalling fields (Uplink CMI and
CMR) shall be used to indicate the codec mode of the looped back frame. In other words, all uplink in band
signalling codewords carry a codec mode indication.
- The MS may change codec mode indication every uplink frame when consecutive frames are not decoded
with the same decoder, even if those frames were associated with the same downlink CMI.
- When looping back any of the following frame types: NO_DATA, RATSCCH, SID_UPDATE,
SID_UPDATE_INH, SID_FIRST, SID_FIRST_P1, SID_FIRST_P2 or SID_FIRST_INH, the MS shall use
the codec mode of the previous uplink frame.
- The number of bits that the MS loops back depends on the codec mode used by the MS to decode the downlink
frame being looped back. The MS shall loop back the bits from interface 1 (See TS 45.003 figure 1b) of the
downlink channel decoder to interface 1 of the uplink channel encoder, i.e. data delivered to the encoding unit:
d(k) for k = 0,1,.,K -1. (See TS 45.003 sub-clause 2.2).
d
- Frames in uplink are transmitted using TX_TYPE = SPEECH_GOOD, whatever RX_TYPE decoded in
downlink.
NOTE: The definitions of TX_TYPE and RX_TYPE are as per TS 26.093.
- After the MS has closed its TCH loop, the parameters of every valid SID_UPDATE frame (RX_TYPE =
SID_UPDATE and BFI = 0) received by the MS on the specified TCH (downlink), shall be taken from the
output of the downlink channel decoder, input to the uplink channel encoder, using TX_TYPE =
SPEECH_GOOD, and transmitted on the same TCH (uplink). The SID_UPDATE parameters shall occupy the
first 35 bits of the speech frame, all other bits of the speech frame shall be set to 0.
- For TCH/AHS or O-TCH/WHS, since a SID_UPDATE occupies two speech frames, the expected uplink
sequence shall be:
- SPEECH (data as all zeros) followed by SPEECH (parameters from SID_UPDATE)
- If the channel decoder detects an erased valid SID_UPDATE frame (RX_TYPE = SID_BAD, BFI = 1), then this
shall be signalled to the SS by setting the input frame to the uplink channel encoder to zero's, using TX_TYPE =
SPEECH_GOOD, and transmitting on the TCH (uplink).
- For TCH/AHS or O-TCH/WFS, each erased valid SID_UPDATE shall result in 2 SPEECH frames with all
zero data sent on the uplink.
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- After the MS has closed its TCH loop, a RATSCCH message shall not be interpreted by the MS. RATSCCH
protocol shall be de-activated and the MS shall not send any form of RATSCCH_ACKnowledgment.
- RATSCCH data of every valid RATSCCH frame (RX_TYPE = NO_DATA (RATSCCH) and BFI = 0) received
by the MS on the specified TCH (downlink), shall be taken from the output of the downlink channel decoder,
input to the uplink channel encoder, using TX_TYPE = SPEECH_GOOD (for TCH/AFS, TCH/AHS,
TCH/WFS, O-TCH/WFS or O-TCH/WHS), and transmitted on the same TCH (uplink). The bit content of the
RATSCCH message for TCH/AFS or TCH/WFS or O-TCH/WFS, or RATSCCH_DATA for TCH/AHS or O-
TCH/WHS shall occupy the first 35 bits of the speech frame, all other bits of the speech frame shall be set to 0.
- For TCH/AHS or O-TCH/WHS, since each RATSCCH_DATA must be preceded by RATSCCH_MARKER,
where 2 downlink frames are fully populated by the RATSCCH_MARKER and RATSCCH_DATA, the
expected uplink sequence shall be:
- SPEECH (data as all zeros) followed by SPEECH (data from RATSCCH_DATA)
- If the channel decoder detects an erased valid RATSCCH frame (RX_TYPE = NO_DATA (RATSCCH) and
BFI = 1), then this shall be signalled to the SS by setting the input frame to the uplink channel encoder to zero's,
using TX_TYPE = SPEECH_GOOD (for TCH/AFS, TCH/AHS, TCH/WFS, O-TCH/WFS or O-TCH/WHS),
and transmitting on the TCH (uplink).
- For TCH/AHS, each erased valid RASTCCH shall result in 2 SPEECH frames with all zero data sent on the
uplink.
- If the channel decoder detects an ONSET frame (RX_TYPE = ONSET) or SID_FIRST frame (for TCH/AFS or
TCH/WFS or O-TCH/WFS only, RX_TYPE = SID_FIRST) or a SID_FIRST_P1 frame (for TCH/AHS or O-
TCH/WHS only, RX_TYPE = SID_FIRST) or a NO_DATA frame (RX_TYPE = NO_DATA, not resulting
from a RATSCCH) then this shall be signalled to the SS by setting the input frame to the uplink channel encoder
to zero's, using TX_TYPE = SPEECH_GOOD (for TCH/AFS, TCH/AHS, TCH/WFS, O-TCH/WFS or O-
TCH/WHS) and transmitting on the TCH (uplink).
- For TCH/AHS or O-TCH/WHS, if the channel decoder detects a SID_FIRST_P2 frame or a SID_FIRST_INH or
SID_UPDATE_INH frame then this shall be signalled to the SS by setting the input frame to the uplink channel
encoder to zero's, using TX_TYPE = SPEECH_GOOD (for TCH/AFS, TCH/AHS, TCH/WFS, O-TCH/WFS or
O-TCH/WHS) and transmitting on the TCH (uplink).
5.1.3 Speech TCH loop without signalling of erased frames (B)
5.1.3.1 Procedure
The SS orders the MS to close its TCH loop by transmitting a CLOSE_TCH_LOOP_CMD message, specifying the
TCH to be looped. The SS then starts timer TT01.
If no TCH is active or any test loop is already closed, the MS shall ignore any CLOSE_TCH_LOOP_CMD message.
If a TCH is active, the MS shall close its TCH loop for the TCH specified and send back to the SS a
CLOSE_TCH_LOOP_ACK. Upon reception of that message the SS stops timer TT01.
After the MS has closed its TCH loop, any speech frame received by the MS on the specified TCH (downlink) shall be
taken from the output of the channel decoder, input to the channel encoder, and transmitted on the same TCH (uplink).
In the case where TCH is TCH/FS, the MS shall loop back the 260 bits after normal channel decoding.
In the case where TCH is TCH/EFS, the MS shall loop back the 244 bits after normal and preliminary channel
decoding.
In the case where TCH is TCH/HS, the MS shall loop back the 112 bits after normal channel decoding.
In the case where a TCH/AFS or TCH/AHS is used, the MS shall loop back the number of bits carried by the downlink
speech frame, after normal channel decoding.
The SS should avoid using the FACCH downlink in this situation until the test is complete.
All requirements defined for Loop A when TCH is TCH/AFS or TCH/AHS also apply to Loop B, except that:
ETSI
3GPP TS 44.014 version 13.0.0 Release 13 13 ETSI TS 144 014 V13.0.0 (2016-01)
- The content of bad speech frame is looped back and not set to all zeros
- If the MS detects an erased valid SID_UPDATE frame (RX_TYPE = SID_BAD, BFI = 1), on the specified TCH
(downlink), the content of the received frame shall be taken from the output of the downlink channel decoder,
input to the uplink channel encoder, using TX_TYPE = SPEECH_GOOD, and transmitted on the same TCH
(uplink). The SID_UPDATE parameters shall occupy the first 35 bits of the speech frame, all other bits of the
speech frame shall be set to 0.
- For TCH/AHS, since a SID_UPDATE occupies two speech frames, the expected uplink sequence shall be:
- SPEECH (data as all zeros) followed by SPEECH (parameters from SID_UPDATE)
- If the MS detects an erased valid RATSCCH frame (RX_TYPE = NO_DATA (RATSCCH) and BFI = 1) on the
specified TCH (downlink), the content of the received frame shall be taken from the output of the downlink
channel decoder, input to the uplink channel encoder, using TX_TYPE = SPEECH_GOOD (for TCH/AFS and
TCH/AHS), and transmitted on the same TCH (uplink). The bit content of the RATSCCH message for
TCH/AFS or RATSCCH_DATA for TCH/AHS shall occupy the first 35 bits of the speech frame, all other bits
of the speech frame shall be set to 0.
- For TCH/AHS, since each RATSCCH_DATA must be preceded by RATSCCH_MARKER, where 2 downlink
frames are fully populated by the RATSCCH_MARKER and RATSCCH_DATA, the expected uplink sequence
shall be:
- SPEECH (data as all zeros) followed by SPEECH (data from RATSCCH_DATA)
5.1.4 TCH burst-by-burst loop (C)
5.1.4.1 Applicability
The test loop shall be implemented by all ME, supporting any TCH.
5.1.4.2 Procedure
Establishment and clearing of the loop is performed at ideal radio conditions.
5.1.4.3 Establishment
- The establishment shall be commanded by transmitting a CLOSE_TCH_LOOP_CMD message. The SS then
starts timer TT01. This command shall be acknowledged by the MS with a CLOSE_TCH_LOOP_ACK
message. Upon receipt of that message the SS stops timer TT01. The MS shall establ
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