14.2.2 Reference sensitivity – TCH/HS (Speech frames)
3GPP51.010-1Mobile Station (MS) conformance specificationPart 1: Conformance specificationTS
14.2.2.1 Definition
The reference sensitivity level is the signal level at the MS receiver input at which a certain BER and FER and UFR for speech frames must be achieved.
14.2.2.2 Conformance requirement
1. At reference sensitivity level, the TCH/HS FER shall meet the reference sensitivity performance of table 1 in 3GPP TS 05.05 subclause 6.2.
2 At reference sensitivity level, the TCH/HS class Ib RBER (BFI=0) shall meet the reference sensitivity performance of table 1 in 3GPP TS 05.05 subclause 6.2.
3 At reference sensitivity level, the TCH/HS class II RBER (BFI=0) shall meet the reference sensitivity performance of table 1 in 3GPP TS 05.05 subclause 6.2.
4. At reference sensitivity level, the TCH/HS UFR shall meet the reference sensitivity performance of table 1 in 3GPP TS 05.05 subclause 6.2.
5. At reference sensitivity level, the TCH/HS class Ib RBER ((BFI or UFI)=0) shall meet the reference sensitivity performance of table 1 in 3GPP TS 05.05 subclause 6.2.
14.2.2.3 Test purpose
1. To verify that the MS does not exceed conformance requirement 1 under TUhigh propagation conditions with an allowance for the statistical significance of the test.
2. To verify that the MS does not exceed conformance requirement 2 under TUhigh propagation conditions with an allowance for the statistical significance of the test.
3. To verify that the MS does not exceed conformance requirement 3 under TUhigh, RA and HT propagation conditions with an allowance for the statistical significance of the test.
4. To verify that the MS does not exceed conformance requirement 4 under TUhigh propagation conditions with an allowance for the statistical significance of the test.
5. To verify that the MS does not exceed conformance requirement 5 under TUhigh propagation conditions with an allowance for the statistical significance of the test.
14.2.2.4 Method of test
14.2.2.4.1 Initial conditions
The BA list sent on the BCCH and SACCH indicates at least six surrounding cells, with at least one near to each band edge. It is not necessary to generate any of these BCCHs, but if provided, the signal strengths of BCCHs shall be in the range 15 dBVemf( ) to 35 dBVemf( ).
The ARFCN of any BCCH shall not be co-channel or on adjacent channels to the wanted traffic channel.
A call is set up according to the generic call set up procedure on a TCH/HS with an ARFCN in the mid ARFCN range, power control level set to maximum power.
The SS transmits Standard Test Signal C1 on the traffic channel.
14.2.2.4.2 Procedure
a) The SS commands the MS to create traffic channel loop back signalling erased frames using test loop A.
NOTE 1: Test loop A is defined in clause 36. Frames detected with BFI=1 are signalled as erased on the uplink.
b) The fading function is set to TUhigh.
c) The SS sets the amplitude of the wanted signal to reference sensitivity level ( ).
d) The SS compares the data of the signal that it sends to the MS with the signal which is looped back from the receiver after demodulation and decoding, and checks the frame erasure indication.
e) The SS determines the number of residual bit error events for the bits of class II, by examining sequences of at least the minimum number of samples of consecutive bits of class II. Bits are taken only from those frames not signalled as erased.
f) The SS determines the number of residual bit error events for the bits of the class Ib, by examining sequences of at least the minimum number of samples of consecutive bits of class Ib. Bits are only taken from those frames not signalled as erased.
g) The SS also determines the frame erasure events by examining sequences of at least the minimum number of samples of consecutive frames and assuming a frame is received successfully, if it is not signalled as erased.
h) Steps d) and e) are repeated, with the SS fading function set in turn to RA and HT.
j) The SS increases the amplitude of the wanted signal to 20 dB above reference sensitivity level.
k) The SS commands the MS to open test loop A and close test loop D.
NOTE 2: Test loop D is defined in clause 36. Frames marked as erased (BFI=1) or unreliable (UFI=1) are signalled to the SS on the uplink.
l) The fading function is set to TUhigh.
m) The SS sets the amplitude of the wanted signal to reference sensitivity level ( ).
n) The SS compares the data of the signal that it sends to the MS with the signal which is looped back from the receiver after demodulation and decoding, and checks the erased/unreliable frame indication.
p) The SS determines the number of residual bit error events for the bits of the class Ib, by examining sequences of at least the minimum number of samples of consecutive bits of class Ib. Bits are only taken from those frames not signalled as erased/unreliable.
q) The SS also determines the unreliable frame events by examining sequences of at least the minimum number of samples of consecutive frames and assuming a frame is received successfully it is not signalled as erased/unreliable.
14.2.2.5 Test requirements
The error rates measured for different channels and under the different propagation conditions, shall not exceed the test limit error rate values given in table 14-7 or 14-8.
Table 14-7: Limits for GSM 400, GSM 700, T-GSM 810, GSM 850 and GSM 900 sensitivity
Channels |
Propagation conditions TUhigh |
Propagation conditions RA |
Propagation conditions HT |
|||
Test limit error rate % |
Minimum No. of samples |
Test limit error rate % |
Minimum No. of samples |
Test limit error rate % |
Minimum No. of samples |
|
TCH/HS (FER) |
4,598 |
13050 |
||||
TCH/HS Class Ib (BFI=0) |
0,404 |
148500 |
||||
TCH/HS Class II (BFI=0) |
7,725 |
25500 |
7,600 |
20000 |
8,500 |
20000 |
TCH/HS (UFR) |
6,250 |
9600 |
||||
TCH/HS Class Ib ((BFI or UFI)=0) |
0,269 |
227000 |
Table 14-8: Limits for DCS 1800 and PCS 1 900 sensitivity
Channels |
Propagation conditions TUhigh |
Propagation conditions RA |
Propagation conditions HT |
|||
Test limit error rate % |
Minimum No. of samples |
Test limit error rate % |
Minimum No. of samples |
Test limit error rate % |
Minimum No. of samples |
|
TCH/HS (FER) |
4,706 |
12750 |
||||
TCH/HS Class Ib (BFI=0) |
0,426 |
141000 |
||||
TCH/HS Class II (BFI=0) |
7,725 |
25500 |
7,600 |
20000 |
8,735 |
20000 |
TCH/HS (UFR) |
6,383 |
9400 |
||||
TCH/HS Class Ib ((BFI or UFI)=0) |
0,291 |
206000 |