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683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.1 Definition | The total transmission delay within the various elements of a GSM system are specified as round trip delays. For the MS this would be equivalent to applying an RF equivalent of a speech signal to the MS receiver, closing an acoustic path from the ERP to the MRP, detecting the corresponding RF signal at the MS transmitter output and measuring the time interval between the signal originally fed to the MS receiver and that transmitted by the MS transmitter.
This simple approach cannot be demonstrated to be accurate due to the inherent non linear characteristic of the speech transcoder. The overall delay therefore is split into four identifiable and measurable delays. The delays are respectively:
- the downlink delay from RF input to DAI output;
- DAI output to ERP;
- MRP to DAI output; and
- DAI to uplink RF output.
Each delay is defined and its method of test described in the following subclauses. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.2 Conformance requirement | The overall speech channel transmission delay shall be less than 143,9 ms.
3GPP TS 03.50, subclause 3.3.6.1. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.3 Test purpose | To verify that the round trip delay, of a speech channel for a MS, which consists of the sum of:
- the downlink delay from RF input to DAI output;
- DAI output to ERP;
- MRP to DAI output; and
- DAI to uplink RF output;
meets the requirements when using the predefined test sequences SEQ01.COD, SEQ03.COD, SEQ04.COD and SEQ05.COD. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.4 Downlink processing delay | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.4.1 Definition | The downlink processing delay is the delay from the first bit of a speech block transmitted from the RF output of the SS up to the last bit of the corresponding speech block received at the DAI on the output of the speech transcoder. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.4.2 Method of test | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.4.2.1 Initial conditions | DTX is off.
The DAI of the MS is connected to the SS and is set to the operating mode "Test of speech decoder/DTX functions (downlink)". |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.4.2.2 Procedure | a) The test set up is that described in subclause 32.1 for downlink speech transcoding.
b) The SS transmits one of the test patterns SEQ01.COD, SEQ03.COD, SEQ04.COD or SEQ05.COD to the MS.
c) The SS measures for each speech block it transmits the time between the first bit at the air interface and the last bit of that speech block on the DAI. This difference is the delay measured.
d) Step c) is repeated 20 times and the maximum delay measured in ms is the downlink processing delay TDP.
NOTE: This is to account for the fact that the processing time may not be constant. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.5 Downlink coding delay | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.5.1 Definition | The downlink coding delay is defined as the delay between the digital representation of an acoustic signal on the DAI and the corresponding acoustic signal at the ERP. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.5.2 Method of test | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.5.2.1 Initial conditions | The DAI of the MS is connected to the SS and is set to the operating mode "Test of acoustic devices and A/D & D/A".
The handset is mounted in the LRGP (see annex 1 of ITU-T Recommendation P.76) and the earpiece is sealed to the knife edge of the artificial ear conforming to ITU-T Recommendation P.51. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.5.2.2 Procedure | a) The SS generates on the DAI a digital representation of a sine wave with a frequency of 1 000 Hz.
b) The SS measures the "phase shift" 1, in the range of 0 to 360 degrees, between the equivalent sine wave generated at the DAI and the sine wave at the input to the artificial ear.
c) The frequency is increased to 1100 Hz and the resulting phase shift 2 noted.
d) The downlink coding delay TDC is calculated from either:
TDC = (2 - 1)/36 ms for 2 > 1; or
TDC = (2 + 360 - 1)/36 ms for 2 < 1 |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.6 Uplink processing delay | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.6.1 Definition | The uplink processing delay is the delay from the first bit of a speech block on the DAI to the last bit of that speech block being transmitted on the air interface of the MS. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.6.2 Method of test | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.6.2.1 Initial conditions | The DAI of the MS is connected to the SS and is set to the operating mode "Test of speech encoder/DTX functions (uplink)". |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.6.2.2 Procedure | a) The test set up is that described in subclause 32.3 for uplink speech transcoding.
b) The SS sends one of the test patterns SEQ01.INP, SEQ03.INP, SEQ04.INP or SEQ05.INP to the DAI of the MS.
c) The SS measures the time between the first bit on the DAI, and the last transmitted bit of the block at the air interface for each speech block the SS sends on the DAI. This time difference is the delay measured.
d) Step c) is repeated 20 times. The maximum delay measured in ms is the uplink coding delay TUP.
NOTE: This is to account for the fact that the processing time may not be constant. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.7 Uplink coding delay | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.7.1 Definition | The uplink coding delay is defined as the delay between an acoustic signal at the MRP and the digital representation of that signal on the DAI. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.7.2 Method of test | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.7.2.1 Initial conditions | The DAI of the MS is connected to the SS and is set to the operating mode "Test of acoustic devices and A/D & D/A".
The handset is mounted in the LRGP (see annex 1 of ITU-T recommendation P.76) and the earpiece is sealed to the knife edge of the artificial ear conforming to ITU-T recommendation P.51. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.7.2.2 Procedure | a) The SS generates an acoustic signal at the artificial mouth of the LRGP, being a pure sine wave with a frequency of 1 000 Hz.
b) The SS measures the "phase shift" 1, in the range of 0 to 360 degrees, between the signal at the MRP and its digital representation on the DAI.
c) The SS set the generated frequency to 1 100 Hz and measures the resulting phase shift 2.
d) The uplink coding delay TUC is calculated from either:
TUC = (2 - 1)/36 ms for 2 > 1; or
TUC = (2 + 360 - 1)/36 ms for 2 < 1 |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.5.8 Test requirement | The sum of the delays {TDP + TDC + TUP + TUC} shall be less than 144,9 ms.
NOTE 1: This limit includes an allowance of 4*0,25 ms delay from the DAI to the MS transmission path.
NOTE 2: No allowances have been made for any delays within the measurement system. These must either be calibrated out or subtracted from the individual delays before performing the sum above. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.6 Half Rate Downlink speech transcoding | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.6.1 Definition | Downlink speech transcoding transforms the 5,6 kbit/s net bit stream obtained by channel decoding the incoming bit stream from the air interface to 104 kbit/s (13 bit linear PCM at 8 kHz) level. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.6.2 Conformance requirement: | The output bit stream from the speech transcoder shall be continuous and bit by bit exactly the same as the predefined output sequences contained in SEQ01.OUT, SEQ02.OUT, SEQ03.OUT and SEQ04.OUT.
3GPP TS 06.02, clause 5; 3GPP TS 06.20. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.6.3 Test purpose: | To verify that the speech transcoder of the MS can transform all the predefined sequences (SEQ01.DEC, SEQ02.DEC, SEQ03.DEC and SEQ04.DEC) at 5,6 kbit/s level to 104 kbit/s (13 bit linear PCM at 8 kHz) level correctly. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.6.4 Method of test | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.6.4.1 Initial conditions | Uplink DTX is off.
The DAI of the MS is connected to the SS and is set to the operating mode "Test of speech decoder/DTX functions (downlink)".
Frequency hopping is on, where the BCCH carrier is part of the hopping sequence. Frequency hopping shall be performed over four carriers using random frequency hopping. Downlink power control shall be activated and a difference of 30 dB between the level of the BCCH carrier and the other carriers adjusted.
NOTE: Frequency hopping is used to ensure that the MS can cope with the reception of bursts (on the BCCH carrier) that have a power level that is different from the rest of the bursts. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.6.4.2 Procedure | a) The SS sends a reset pulse to the MS on the digital audio interface. This reset pulse will start the clock output of the MS at 104 kHz (pin 24 of the DAI).
b) The SS sends test sequence SEQ01.DEC at 5,6 kbit/s to the MS via the air interface after passing it through the SS channel encoder. The speech decoder of the MS is reset by the special reset sequence which is at the beginning of the test sequence.
c) The SS records the 104 kbit/s output bit stream from the MS on the digital audio interface. The recording shall be triggered by the reception of the encoder homing frame. The encoder homing frame itself shall not be recorded.
d) The test is repeated using test sequences SEQ02.DEC, SEQ03.DEC and SEQ04.DEC. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.6.5 Test requirement | The bit stream output shall be continuous and bit by bit exactly the same as the sequence describing the speech data contained in the files SEQ01.OUT, SEQ02.OUT, SEQ03.OUT and SEQ04.OUT. The two encoder homing frames at the beginning of each test sequence *.OUT shall be disregarded for this comparison. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.7 Half Rate Downlink receiver DTX functions | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.7.1 Definition | The DTX receiver functions consist of a SID frame detector, comfort noise generator functions and lost frame substitution and muting functions. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.7.2 Conformance requirement | The output bit stream from the speech transcoder shall be continuous and bit by bit exactly the same as the predefined output sequences contained in DTX*.OUT described in 3GPP TS 06.07 subclause 7.
3GPP TS 06.02, clauses 6 and 8; 3GPP TS 06.22; 3GPP TS 06.41. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.7.3 Test purpose | To verify that the MS generates comfort noise correctly. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.7.4 Method of test | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.7.4.1 Initial conditions | The DAI of the MS is connected to the SS and is set to the operating mode "Test of speech decoder/DTX functions (downlink)".
Frequency Hopping is on, where the BCCH carrier is part of the hopping sequence. Frequency Hopping shall be done over four carriers using random Frequency Hopping.
NOTE: Frequency Hopping is used to ensure that the MS can cope with the reception of dummy bursts (on the BCCH frequency) during DTX. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.7.4.2 Procedure | a) The SS sends a reset pulse to the MS on the digital audio interface. This reset pulse will start the clock output of the MS at 104 kHz (pin 24 of the DAI).
b) The SS sends test sequence DTX01.DEC at 5,6 kbit/s to the MS via the air interface after passing it through the SS channel encoder. The speech decoder of the MS will be reset by the special reset sequence which is at the beginning of the test sequence.
c) The SS transmission of the TDMA frames of the TCH/HS on the air interface is ramped "on" and "off" on a traffic frame by traffic frame basis, taking into account the block diagonal interleaving scheme defined in 3GPP TS 05.03. The first traffic frame in step b occurs one frame after the window of the SACCH multiframe (TDMA frame 0 or 52 modulo 104 for subchannel 0 and TDMA frame 1 or 53 modulo 104 for subchannel 1), allocated for the SID frame (see 3GPP TS 05.02 and 3GPP TS 05.08). The SACCH will also be transmitted.
d) The information whether to ramp the transmitter of the SS "on" or "off" is derived from the sequence of SP-flags contained in the file DTX01.COD (see file format description in 3GPP TS 06.07 clause 5 for the position of the SP-flag).
e) The SS records the 104 kbit/s output bit stream from the MS on the digital audio interface. The recording shall be triggered by the reception of the encoder homing frame. The encoder homing frame itself is not recorded.
f) The test is repeated using test sequences *.DEC described in 3GPP TS 06.07 clause 7. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.7.5 Test requirement | The bit stream output shall be continuous and bit by bit exactly the same as the sequence describing the speech data contained in the files DTX*.OUT described in 3GPP TS 06.07 subclause 7. The two encoder homing frames at the beginning of each test sequence *.OUT shall be disregarded for this comparison. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.8 Half Rate Uplink speech transcoding | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.8.1 Definition | Uplink speech transcoding transforms 104 kbit/s (13 bit linear PCM at 8 kHz) level to the 5,6 kbit/s net bit stream. This net bit stream is to be channel encoded for transmission on the air interface. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.8.2 Conformance requirement | The output bit stream from the speech transcoder shall be bit by bit exactly the same as the predefined sequences contained in SEQ01.COD, SEQ02.COD and SEQ03.COD described in 3GPP TS 06.07 clause 6.
3GPP TS 06.02, clause 5; 3GPP TS 06.20. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.8.3 Test purpose | To verify that the speech transcoder of the MS can transform all the predefined sequences SEQ01.INP, SEQ02.INP and SEQ03.INP at 104 kbit/s (13 bit linear PCM at 8 kHz) level to 5,6 kbit/s level correctly. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.8.4 Method of test | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.8.4.1 Initial conditions | Uplink DTX is off.
The DAI of the MS is connected to the SS and is set to the operating mode "Test of speech encoder/DTX functions (uplink)".
Frequency hopping is on. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.8.4.2 Procedure | a) The SS sends a reset pulse to the MS on the digital audio interface. This reset pulse will start the clock output of the MS at 104 kHz (pin 24 of the DAI).
b) The SS synchronizes the input of the test sequences via the digital audio interface to the framing of the MS in the uplink. This can be done in two steps as follows:
b.1) The SS sends to the MS at 104 kbit/s level via the digital audio interface 13 triplets of input frames, each triplet consisting of 480 samples. The 480 samples of one triplet shall all be identical. The 13 bits of one sample shall all be set to "zero" except for one which is set to "one". The position of the bit within the 13 bits of a sample that is set to "one" shall vary in such a way, that all possible 13 positions are exercised within the 13 triplets of input frames. An example for such a sequence is given in test sequence BITSYNC.INP described in 3GPP TS 06.07 subclause 8. The SS records the 5,6 kbit/s output bit stream obtained by channel decoding the incoming bit stream from the air interface. As soon as the decoder homing frame is detected at the output, the framing of the MS with respect to the 13 bit long input words is known by looking at the corresponding input frame that has caused the decoder homing frame at the output.
NOTE: The encoder homing frame consists of 160 identical samples, each 13 bit long left justified, with the least significant bit set to "one" and all other bits set to "zero" (0008 hex). The speech encoder will go to its predefined home state at the end of the first received encoder homing frame. Consecutive encoder homing frames will produce the decoder homing frame at the output of the speech encoder.
b.2) Synchronized to the 13 bit framing of the MS, the SS now sends test sequence SEQSYNC.INP described in 3GPP TS 06.07 subclause 8 to the MS at 104 kbit/s level via the digital audio interface. The SS records the 5,6 kbit/s output bit stream obtained by channel decoding the incoming bit stream from the air interface. The recording shall be triggered by the reception of the decoder homing frame. By comparing the first recorded frame that is not a decoder homing frame with the 160 possible output frames contained in sequences SYNC*.COD, the offset of the input to the 20 ms framing of the MS is known.
c) Synchronized to the 20 ms framing of the MS, the SS sends a test sequence SEQ01.INP to the MS at 104 kbit/s level via the digital audio interface. The speech encoder of the MS is reset by the special homing sequence which is at the beginning of the test sequence.
d) The SS records the 5,6 kbit/s output bit stream obtained by channel decoding the incoming bit stream from the air interface. The recording shall be triggered by the reception of the decoder homing frame. The decoder homing frame itself is not recorded.
e) The test is repeated using test sequences SEQ02.INP and SEQ03.INP. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.8.5 Test requirements | The bit stream output shall be bit by bit exactly the same as the sequences describing the speech parameters contained in the files SEQ01.COD, SEQ02.COD and SEQ03.COD. The two decoder homing frames at the beginning of each test sequence *.COD shall be disregarded for this comparison. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.9 Half Rate Uplink transmitter DTX functions | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.9.1 Definition | The VAD/DTX transmitter functions consist of a Voice Activity Detector (VAD) that inhibits the transmitter during speech pauses, and a surrounding Discontinuous Transmission (DTX) system introducing Silence Descriptor (SID) frames on the air interface. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.9.2 Conformance requirement | The MS VAD and DTX function allow only those frames to be transmitted that are either properly positioned SID‑frames, SACCH-frames or frames marked with SP-flag = 1.
For the transmitted frames, the output bit stream from the speech transcoder shall be bit by bit exactly the same as the predefined sequences contained in DTX*.COD described in 3GPP TS 06.07 subclause 6.
3GPP TS 05.08, subclause 8.3; 3GPP TS 06.02, clauses 6 and 7; 3GPP TS 06.41; 3GPP TS 06.42. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.9.3 Test purpose | To verify that the combination of VAD and DTX operates correctly. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.9.4 Method of test | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.9.4.1 Initial conditions | Uplink DTX is on.
The DAI of the MS is connected to the SS and is set to the operating mode "Test of speech encoder/DTX functions (uplink)".
Frequency Hopping is on. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.9.4.2 Procedure | a) The SS sends a reset pulse to the MS on the digital audio interface. This reset pulse will start the clock output of the MS at 104 kHz (pin 24 of the DAI).
b) The SS synchronizes the input of the test sequences via the digital audio interface to the framing of the MS in the uplink. This can be done in two steps as follows:
b.1) The SS sends to the MS at 104 kbit/s level via the digital audio interface 13 triplets of input frames, each triplet consisting of 480 samples. The 480 samples of one triplet shall all be identical. The 13 bits of one sample shall all be set to "zero" except for one which is set to "one". The position of the bit within the 13 bits of a sample that is set to "one" shall vary in such a way, that all possible 13 positions are exercised within the 13 triplets of input frames. An example for such a sequence is given in test sequence BITSYNC.INP described in 3GPP TS 06.07 subclause 8. The SS records the 5,6 kbit/s output bit stream obtained by channel decoding the incoming bit stream from the air interface. As soon as the decoder homing frame is detected at the output, the framing of the MS with respect to the 13 bit long input words is known by looking at the corresponding input frame that has caused the decoder homing frame at the output.
NOTE: The encoder homing frame consists of 160 identical samples, each 13 bit long left justified, with the least significant bit set to "one" and all other bits set to "zero" (0008 hex). The speech encoder will go to its predefined home state at the end of the first received encoder homing frame. Consecutive encoder homing frames will produce the decoder homing frame at the output of the speech encoder.
b.2) Synchronized to the 13 bit framing of the MS, the SS now sends test sequence SEQSYNC.INP described in 3GPP TS 06.07 subclause 8 to the MS at 104 kbit/s level via the digital audio interface. The SS records the 5,6 kbit/s output bit stream obtained by channel decoding the incoming bit stream from the air interface. The recording shall be triggered by the reception of the decoder homing frame. By comparing the first recorded frame that is not a decoder homing frame with the 160 possible output frames contained in sequences SYNC*.COD, the offset of the input to the 20 ms framing of the MS is known.
c) The SS sends test sequence DTX01.INP of PCM samples described in 3GPP TS 06.07 clause 7 on the digital audio interface in the MS at 104 kbit/s (13 bit linear PCM at 8 kHz). The speech encoder of the MS will be reset by the special homing sequence which is at the beginning of the test sequence.
d) The start of the test sequence is synchronized with the radio transmission on the air interface so that the first traffic frame on the air caused by the first encoder homing frame in the test sequence occurs just after the traffic frame allocated for the SID frame (TDMA frame 0 or 52 modulo 104 for subchannel 0 and TDMA frame 1 or 53 modulo 104 for subchannel 1), allocated for the SID frame (see 3GPP TS 05.02 and 3GPP TS 05.08).
e) The SS detects whether or not there is any power transmitted over the radio path on a time slot basis excluding SACCH frames. The speech frame by speech frame on/off transmission (on = 1) is calculated and recorded. The recording shall be triggered by the reception of the decoder homing frame. The flag marking the decoder homing frame itself is not recorded.
f) The SS records the 5,6 kbit/s output bit stream obtained by channel decoding the incoming bit stream from the air interface. The recording shall be triggered by the reception of the decoder homing frame. The decoder homing frame itself is not recorded.
g) The test is repeated for all test sequences DTX*.INP described in 3GPP TS 06.07 clause 7. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.9.5 Test requirements | 1) The bit stream recorded in step e) shall be continuous and bit by bit exactly the same as the sequence of SP-flags contained in the files DTX*.COD (see file format description in 3GPP TS 06.07 subclause 5 for the position of the SP-flag), except for the bits marking those frames that are SID frames scheduled for transmission according to 3GPP TS 06.41. The first two frames in the reference files *.COD shall be disregarded for this comparison.
2) The bit stream recorded in step f) shall be continuous and bit by bit exactly the same as the sequence describing the speech parameters contained in the files *.COD described in 3GPP TS 06.07 subclause 7, except for the bits of the speech frames marked with SP-flag=0. The two decoder homing frames at the beginning of each test sequence *.COD shall be disregarded for this comparison. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10 Half Rate Speech channel transmission delay | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.1 Definition | The total transmission delay within the various elements of a GSM system are specified as round trip delays. For the MS this would be equivalent to applying an RF equivalent of a speech signal to the MS receiver, closing an acoustic path from the ERP to the MRP, detecting the corresponding RF signal at the MS transmitter output and measuring the time interval between the signal originally fed to the MS receiver and that transmitted by the MS transmitter.
This simple approach cannot be demonstrated to be accurate due to the inherent non linear characteristic of the speech transcoder. The overall delay therefore is split into four identifiable and measurable delays. The delays are respectively:
- the downlink delay from RF input to DAI output;
- DAI output to ERP;
- MRP to DAI output; and
- DAI to uplink RF output.
Each delay is defined and its method of test described in the following subclauses. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.2 Conformance requirement | The overall speech channel transmission delay shall be less than 143,9 ms.
3GPP TS 03.50 subclause 3.3.6.2. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.3 Test purpose | To verify that the round trip delay of a speech channel for a MS which consists of the sum of:
- the downlink delay from RF input to DAI output;
- DAI output to ERP;
- MRP to DAI output; and
- DAI to uplink RF output;
meets the requirements when using the predefined test sequences SEQ01.INP and SEQ01.DEC. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.4 Downlink processing delay | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.4.1 Definition | The downlink processing delay is the delay from the first bit of a speech block transmitted from the RF output of the SS up to the last bit of the corresponding speech block received at the DAI on the output of the speech transcoder. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.4.2 Method of test | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.4.2.1 Initial conditions | The DAI of the MS is connected to the SS and is set to the operating mode "Test of speech decoder/DTX functions (downlink)". |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.4.2.2 Procedure | a) The test set up is that described in subclause 32.6.4.2 for downlink speech transcoding.
b) The SS transmits the test pattern SEQ01.DEC described in 3GPP TS 06.07 subclause 6 to the MS.
c) The SS measures for each speech block it transmits the time between the first bit at the air interface and the last bit of that speech block on the DAI. This time difference is the delay measured.
d) Step c) is repeated 20 times and the maximum delay measured in ms is the downlink processing delay TDP.
NOTE: This is to account for the fact that the processing time may not be constant. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.5 Downlink coding delay | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.5.1 Definition | The downlink coding delay is defined as the delay between the digital representation of an acoustic signal on the DAI and the corresponding acoustic signal at the ERP. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.5.2 Method of test | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.5.2.1 Initial conditions | The DAI of the MS is connected to the SS and is set to the operating mode "Test of acoustic devices and A/D & D/A".
The handset is mounted in the LRGP (see annex 1 of ITU-T recommendation P.76) and the earpiece is sealed to the knife edge of the artificial ear conforming to ITU-T recommendation P.51. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.5.2.2 Procedure | a) The SS generates on the DAI a digital representation of a sine wave with a frequency of 1 000 Hz.
b) The SS measures the "phase shift" 1, in the range of 0 to 360 degrees, between the equivalent sine wave generated at the DAI and the sine wave at the input to the artificial ear.
c) The frequency is increased to 1 100 Hz and the resulting phase shift 2 noted.
d) The downlink coding delay TDC is calculated from either:
TDC = (2 - 1) ms/36 for 2 > 1; or
TDC = (2 + 360 - 1) ms/36 for 2 < 1 |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.6 Uplink processing delay | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.6.1 Definition | The uplink processing delay is the delay from the first bit of a speech block on the DAI to the last bit of that speech block being transmitted on the air interface of the MS.
32.10.6.2 Method of test |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.6.2.1 Initial conditions | The DAI of the MS is connected to the SS and is set to the operating mode "Test of speech encoder/DTX functions (uplink)". |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.6.2.2 Procedure | a) The test set up is that described in subclause 32.8.4.2 for uplink speech transcoding.
b) The SS sends one of the test patterns SEQ01.INP described in 3GPP TS 06.07 subclause 6 to the DAI of the MS.
c) The SS measures the time between the first bit on the DAI, and the last transmitted bit of the block at the air interface for each speech block the SS sends on the DAI. This time difference is the delay measured.
d) Step c) is repeated 20 times. The maximum delay measured in ms is the uplink coding delay TUP.
NOTE: This is to account for the fact that the processing time may not be constant. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.7 Uplink coding delay | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.7.1 Definition | The uplink coding delay is defined as the delay between an acoustic signal at the MRP and the digital representation of that signal on the DAI. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.7.2 Method of test | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.7.2.1 Initial conditions | The handset is mounted in the LRGP (see annex 1 of ITU-T recommendation P.76) and the earpiece is sealed to the knife edge of the artificial ear conforming to ITU-T recommendation P.51. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.7.2.2 Procedure | a) The SS generates an acoustic signal at the artificial mouth of the LRGP, being a pure sine wave with a frequency of 1 000 Hz.
b) The SS measures the "phase shift" 1, in the range of 0 to 360 degrees, between the signal at the MRP and its digital representation on the DAI.
c) The SS sets the generated frequency to 1 100 Hz, and measures the resulting phase shift 2.
d) The uplink coding delay TUC is calculated from either:
TDC = (2 - 1) ms/36 for 2 > 1; or
TDC = (2 + 360 - 1) ms/36 for 2 < 1 |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.10.8 Test requirement | The sum of the delays TDP, TDC, TUP, and TUC shall be less than 144,9 ms.
NOTE: This limit includes an allowance of 4*0,25 ms delay from the DAI to the MS transmission path. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.11 Intra cell channel change from a TCH/HS to a TCH/FS | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.11.1 Definition | Dual rate MSs support an intra cell channel change from a TCH/HS to a TCH/FS by switching the Speech and channel codec used from HR to FR. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.11.2 Conformance requirement: | 1) When commanded to perform an intra cell channel change from a TCH/HS to a TCH/FS, the MS shall switch channels from HR to FR. The maximum time allowed for the MS to perform this switch in rates is 20 ms.
3GPP TS 05.10, subclause 6.8.
2) For an intra cell channel change, the time between the end of the last complete speech or data frame or message block sent on the old channel and the time the MS is ready to transmit on the new channel shall be less than 20 ms.
3GPP TS 05.10, subclause 6.8. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.11.3 Test purpose: | 1) To verify that the MS encodes speech correctly after performing an intra cell channel change from a TCH/HS to a TCH/FS.
2) To verify that the MS, when commanded to perform an intracell channel change to a new ARFCN and/or timeslot number within the same cell, if the starting time is not used in the ASSIGNMENT COMMAND, is ready to transmit on the new channel within 20 ms of the last complete speech frame or message block sent on the old channel. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.11.4 Method of test | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.11.4.1 Initial conditions | Uplink DTX is off.
The SS sets up a call according to the generic call set up procedure on a HR channel in the low ARFCN range on timeslot 1. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.11.4.2 Procedure | a) The SS records the sequence of BFI flags obtained by channel decoding the incoming bit stream from the uplink air interface using the HR channel decoder on the old channel and at the same time records the sequence of BFI flags obtained by channel decoding the incoming bit stream from the uplink air interface using the FR channel decoder on the channel to which the channel change will take place.
b) The SS sends an ASSIGNMENT COMMAND to the MS allocating a FR channel in the high ARFCN range on timeslot 2, and with a power command of 7. These old and new carriers have a relative frequency tolerance of 0, and a relative timing tolerance of 1/4 bit.
c) The time at which the sequence of BFI flags at the output of the HR channel decoder performs the first transition from 0 to 1 is registered (t1). In case of occurrence of speech frames after an RR frame, the next transition of the BFI flag from 0 to 1 after the reception of the RR frame is defined as t1.
d) The time values at which the sequence of BFI flags at the output of the FR channel decoder performs transitions from 1 to 0 are registered. The time t2 is defined as the time where the BFI flag at the output of the FR channel decoder toggles from 1 to 0 due to a correctly received speech traffic frame received at the channel decoder. Transitions due to the occurrence of an ASSIGNMENT COMPLETE frame or an SABM frame after the reception of good speech frames shall not be considered. If the first frame sent on the new traffic channel was an SABM frame, t2 is defined as the time the BFI flag toggles from 1 to 0 due to a correctly received speech traffic frame after the reception of the SABM frame.
NOTE: There shall be an allowance of at maximum two transitions for this BFI flag from 0 to 1 and back to zero again after t2. These transitions are caused by the SABM frame if it was not the first frame to be sent on the new TCH, or the ASSIGNMENT COMPLETE frame, or both. Since both frames are FACCH frames, each would cause exactly one BFI=1 indications.
e) The time difference Dt = t2 - t1 shall be calculated. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.11.5 Test requirement | 1) The last transition of the BFI flag at the output of the FR channel decoder from 1 to 0 shall be followed by a sequence of at least 50 zeroes, interrupted by at maximum two transitions to 1, each interruption containing exactly one BFI=1 flag, caused by the SABM or the ASSIGNMENT COMPLETE frames.
2) The calculated time difference Dt shall not exceed 13 TDMA frames. If the first frame sent on the new channel was an SABM frame, an additional time difference of 4 frames is allowed. If the last frame sent on the old channel was an RR frame, an additional time difference of 9 frames is allowed.
NOTE: The BFI of the old channel will toggle from 0 to 1 only four frames after the reception of the last bit of the speech frame sent on the old channel. The time between the last bit of the last complete speech or data frame or message block sent on the old channel and the time the MS is ready to transmit on the new channel shall be less than 20 ms (3GPP TS 05.10, subclause 6.8). This time will expire 4 frames and 3 timeslots after the sending of the last bit of the last complete speech frame on the old channel, i.e. the MS may not be able to transmit in the corresponding timeslot in the current frame, but must wait approx. 4 frames until the next allowed frame (FN mod 13 = 0, 4 or 8) is reached.
The next frame could be an idle frame, so the MS must wait for another frame. This equates to 5 frames, after which the MS is able to start transmission on the new channel.
Additionally, 8 frames will be needed due to interleaving until the last bit of the first speech frame on the new channel is received and the BFI flag toggles from 1 to 0.
This makes a total of 13 frames or 60 ms between the frame number when the BFI toggles from 0 to 1 on the old channel and the frame number when the BFI toggles from 1 to 0 on the new channel. See diagram below.
If SABM is the first frame received on the new channel, 4 more frames are allowed.
If RR is the last frame sent on the old channel, additionally 9 more frames are allowed (RR frames plus an idle frame).
t1
+4
+1
+8
t2
< >
< >
< >
(last frame TCH/HS)
(first frame TCH/FS)
(here subchannel 1)
x
x
x
x
I
x
x
x
x
x
x
x
x
/
< 20 ms >
(idle)
BFI=0
BFI=1
BFI=0
MS ready
MS able
to transmit
to transmit
t1
+4
+1
<-------------------------->
< >
<------------------------- (RR frame ) ------------------------------------------>
x
x
x
x
x
x
x
x
I
< 20 ms >
BFI =0
BFI=1
MS ready
to transmit |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.12 Intra cell channel change from a TCH/FS to a TCH/HS | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.12.1 Definition | Dual rate MSs support an intra cell channel change from a TCH/FS to a TCH/HS by switching the Speech and channel codec used from FR to HR. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.12.2 Conformance requirement: | 1) When commanded to perform an intra cell channel change from a TCH/FS to a TCH/HS, the MS shall switch channels from FR to HR.
3GPP TS 05.10 subclause 6.8.
2) For an intra cell channel change, the time between the end of the last complete speech or data frame or message block sent on the old channel and the time the MS is ready to transmit on the new channel shall be less than 20 ms.
3GPP TS 05.10, subclause 6.8. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.12.3 Test purpose: | 1) To verify that the MS encodes speech correctly after performing an intra cell channel change from a TCH/FS to a TCH/HS.
2) To verify that the MS, when commanded to perform an intra cell channel change to a new ARFCN and/or new timeslot number within the same cell, if the starting time is not used in the ASSIGNMENT COMMAND, is ready to transmit on the new channel within 20 ms of the last complete speech frame or message block sent on an old channel. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.12.4 Method of test | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.12.4.1 Initial conditions | Uplink DTX is off.
The SS sets up a call according to the generic call set up procedure on a FR channel in the low ARFCN range on timeslot 1. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.12.4.2 Procedure | a) The SS records the sequence of BFI flags obtained by channel decoding the incoming bit stream from the uplink air interface using the FR channel decoder on the old channel and at the same time the sequence of BFI flags obtained by channel decoding the incoming bit stream from the uplink air interface using the HR channel decoder on the channel to which the channel change will take place.
b) The SS sends an ASSIGNMENT COMMAND to the MS allocating a HR channel on sub-channel 0 in the high ARFCN range on timeslot 2, and with a power command of 7. These old and new carriers have a relative frequency tolerance of 0, and a relative timing tolerance of 1/4 bit.
c) The time at which the sequence of BFI flags at the output of the FR channel decoder performs the first transition from 0 to 1 is registered (t1). In case of occurrence of speech frames after an RR frame, the next transition of the BFI flag from 0 to 1 after the reception of the RR frame is defined as t1.
d) The time values at which the sequence of BFI flags at the output of the HR channel decoder performs transitions from 1 to 0 are registered. The time t2 is defined as the time where the BFI flag at the output of the HR channel decoder toggles from 1 to 0 due to a correctly encoded speech traffic frame received at the channel decoder. Transitions due to the occurrence of an ASSIGNMENT COMPLETE frame or and SABM frame after the reception of good speech frames shall not be considered. If the first frame sent on the new traffic channel was an SABM frame, t2 is defined as the time the BFI flag toggles from 1 to 0 due to a correctly received speech traffic frame after the reception of the SABM frame.
NOTE: There shall be an allowance of at maximum two transitions for this BFI flag from 0 to 1 and back to zero again after t2. These transitions are caused by the SABM frame if it was not the first frame to be sent on the new TCH, or the ASSIGNMENT COMPLETE frame, or both. Since both frames are FACCH frames, each would cause exactly two BFI=1 indications.
e) The time difference Dt = t2 - t1 shall be calculated. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 32.12.5 Test requirement | 1) The last transition of the BFI flag at the output of the HR channel decoder from 1 to 0 shall be followed by a sequence of at least 50 zeroes, interrupted by at maximum two transitions to 1, each interruption containing exactly two BFI=1 flags, caused by the SABM or the ASSIGNMENT COMPLETE frames.
2) The calculated time difference Dt shall not exceed 12 TDMA frames. if the first frame sent on the new channel was an SABM frame,an additional time difference of 9 frames is allowed. If the last frame sent on the old channel was an RR frame, an additional time difference of 5 frames is allowed.
NOTE: The BFI of the old channel will toggle from 0 to 1 only 4 frames after the reception of the last bit of the last speech frame sent on the old channel. The BFI on the old channel will toggle from 0 to 1 only four frames after the reception of the last bit of the last complete speech or data frame or message block sent on the old channel.
The time between the last bit of the last complete speech frame sent on the old channel and the time the MS is ready to transmit on the new channel shall be less than 20 ms (3GPP TS 05.10, subclause 6.8). This time will expire 4 frames and 3 timeslots after the sending of the last bit of the last complete speech frame on the old channel, i.e. the MS may not be able to transmit in the corresponding new timeslot in its current frame, but must wait approx. 4 frames until the next allowed frame (FN mod 13 = 0, 4 or 8) is reached.
The next frame could be an idle frame, so the MS must wait for another frame. This equates to 5 frames, after which the MS is able to start transmission on the new channel.
Additionally, 7 frames will be needed due to interleaving until the last bit of the first speech frame on the new channel is received and the BFI flag toggles from 1 to 0.
This makes a total of 12 frames or 55,4 ms between the frame number when the BFI toggles from 0 to 1 on the old channel and the frame number when the BFI toggles from 1 to 0 on the new channel. See diagram below.
If SABM is the first frame received on the new channel, 9 more frames are allowed.
If RR is the last frame sent on the old channel, 5 more frames are allowed.
t1
+4
+1
+7
t2
< >
< >
< >
(last frame TCH/FS)
(first frame TCH/HS)
(here subchannel 0)
x
x
x
x
x
x
x
x
I
x
x
x
x
/
< 20 ms >
(idle)
BFI=0
BFI=1
BFI=0
MS ready
MS able
to transmit
to transmit
t1
+4
+1
<------------------- >
< --->
<------------------- (RR frame) ------------->
x
x
x
x
x
x
x
x
I
x
x
/
< 20 ms >
(idle)
BFI=0 BFI=1
MS ready
to transmit |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 33 Mobile station features | 3GPP TS 02.07 defines mandatory and optional MS features. Their presence and appropriate functioning are verified by the following tests. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 33.1 Entry and display of called number | |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 33.1.1 Definition | The entry and display of a called number is the ability of a MS to correctly display and signal to the network the user required number. |
683b5b8a98f7b1390ddd5516ea9247a2 | 51.010-1 | 33.1.2 Conformance requirement | 1) The number of the called subscriber is included in the Called party BCD number Information element of the SETUP message for an outgoing call.
The "Display of Called number" shall be implemented in an MS where a human interface is provided.
2) The "Numbering plan identification" is included in the Called party BCD number Information element of the SETUP message for an outgoing call.
An MS with MMI shall as default use the Numbering Plan Identification ITU-T E164, unless otherwise indicated by the user.
3) The "Type of number" is included in the Called party BCD number Information element of the SETUP message for an outgoing call.
An MS with MMI shall, if the "+" is not entered, and a number is entered, set the Type of Number to "unknown".
4) The "Type of number" is included in the Called party BCD number Information element of the SETUP message for an outgoing call.
An MS with MMI shall, if the "+" is entered, and a number is entered, set the Type of Number to "International". |
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