26.6.6 Test of frequency redefinition
3GPP51.010-1Mobile Station (MS) conformance specificationPart 1: Conformance specificationTS
The Frequency Redefinition procedure is used by the network to change the frequencies and hopping sequences of the allocated channels.
26.6.6.1 Frequency redefinition
26.6.6.1.1 Conformance requirements
An MS, after receiving a FREQUENCY REDEFINITION message, shall start using the new frequencies and hopping sequence in the correct time slot when the MS is allocated a dedicated channel.
The behaviour described in the test purpose is applied for each combination of the value T(k) (k = 1,2,3) and for each supported dedicated channel type.
References
3GPP TS 04.08 / 3GPP TS 44.018 subclauses 3.4.5, 9.1.13 and 10.5.2.13.
26.6.6.1.2 Test purpose
To verify that the MS, after receiving a Frequency Redefinition message, starts using the new frequencies and hopping sequence at the time indicated in the message.
26.6.6.1.3 Method of test
Initial Conditions
System Simulator:
1 cell, CCCH_CONF set to 1 basic physical channel used for CCCH, not combined with SDCCHs. The cell allocation is set to CA (1) , depending on the band of operation of the Mobile Station before each execution of this test.
Mobile Station:
The MS is in the "idle, updated" state, with a TMSI allocated.
Specific PICS statements
– MS supports GSM HR (TSPC_AddInfo_Halfrate)
PIXIT statements
–
Foreseen Final State of the MS
"Idle, updated", with TMSI allocated.
Test Procedure
Test parameters:
ca (1) is set according to the column ca(1) of table below.
An arbitrary subset CA(1) of the set in the column CA Range of the table below containing ca(1) elements is drawn. CA(1) is then coded using the coding scheme from the table below.
An element B of the set CA(1) is arbitrarily chosen.
An arbitrary value ca(2) in the range indicated in column ca(2) of the table below is chosen.
An arbitrary subset CA(2) of the set in the column CA Range of the table below with ca(2) elements and containing B is chosen.
An arbitrary value ca(3) in the range indicated in column ca(3) of the table below is chosen.
An arbitrary subset CA(3) of the set in the column CA Range of the table below with ca(3) elements and containing B is chosen.
For j = 1,2,3, values ma(j) in the range j,…,ca(j)‑1 and values MAIO(j) in the range 0,…,ma(j)‑1 are arbitrarily chosen.
Subsets MA(j) of CA(j) not containing B and having ma(j) elements are arbitrarily chosen.
Band |
ca(1) |
CA Range |
ca(2) |
ca(3) |
Coding |
GSM 450 |
32 |
259,…,293 |
17,…,31 |
4,…,16 |
Range 128 |
GSM 480 |
32 |
306,…,340 |
17,…,31 |
4,…,16 |
Range 128 |
GSM 710 |
64 |
438,…,511 |
19,…,62 |
3,…,18 |
Range 128 |
GSM 750 |
64 |
438,…,511 |
19,…,62 |
3,…,18 |
Range 128 |
T-GSM 810 |
64 |
438,…,511 |
19,…,62 |
3,…,18 |
Range 128 |
GSM 850 |
64 |
128,…,251 |
19,…,62 |
3,…,18 |
Variable bitmap |
GSM 900 |
64 |
1,…,124 |
20,…,63 |
4,…,19 |
Bitmap 0 |
DCS 1 800 |
64 |
700,…,812 |
17,…,63 |
4,…,16 |
Variable bitmap |
PCS 1 900 |
64 |
700,…,810 |
17,…,63 |
4,…,16 |
Variable bitmap |
Let T(1) = 91, T(2) = 42 000.
An arbitrary value T(3) in the range 92,…,29999 is chosen.
The System Simulator pages the MS and after the MS has responded with a CHANNEL REQUEST, the simulator assigns a dedicated channel (TCH/F, TCH/H or SDCCH, as defined by the execution counter R). Then the SS sends a FREQUENCY REDEFINITION message, which modifies the frequencies/hopping sequence to be used by the MS. The MS shall then, at the TDMA frame defined by the contents of the "Starting Time" information element , use the new frequencies/hopping sequence. (The value of T(2) ensures that the MS believes the Starting Time has passed and so the MS shall start transmitting immediately. Immediately being in the scope of this test no later than 73 Frames for SDCCH/8 or TCH/F and 90 Frames for TCH/H after the SS sends the last burst of the first L2 frame containing the beginning of the FREQUENCY REDEFINITION message. The range for T(3) ensures that the MS has to wait until the designated frame before starting transmission on the new frequencies.)
The verification is performed at the RF burst level. The MS transmits the standard test signal C1 (annex 5), and for the TCH case, the SS checks the received pattern with the expected pattern. For the SDCCH case the MS transmits fill frames, and the SS checks for each burst whether the burst is transmitted at the right frequency.
Maximum Duration of Test
3 * (number of supported channels * T(3) + 7)
Expected Sequence
This sequence is performed for every combination of execution counters K = 1,2,3 and R = 1,2,3:
Step |
Direction |
Message |
Comments |
1 |
SS -> MS |
PAGING REQUEST TYPE 1 |
|
2 |
MS -> SS |
CHANNEL REQUEST |
|
3 |
SS -> MS |
IMMEDIATE ASSIGNMENT |
|
4 |
MS -> SS |
PAGING RESPONSE |
|
4A |
SS -> MS |
IDENTITY REQUEST |
Identity type : IMSI |
4B |
MS -> SS |
IDENTITY RESPONSE |
The response is not checked by the SS |
5 |
——– |
——– |
The SS checks that the MS is transmitting on the correct frequencies without delay. |
6 |
SS -> MS |
FREQUENCY REDEFINITION |
See description 1 below. |
7 |
——– |
——– |
The SS checks that the MS is transmitting on the correct frequencies and that the transmissions started in the correct frame. |
7A |
SS -> MS |
IDENTITY REQUEST |
Identity type : IMSI |
7B |
MS -> SS |
IDENTITY RESPONSE |
The response is not checked by the SS |
8 |
SS -> MS |
FREQUENCY REDEFINITION |
See description 2 below. |
9 |
——– |
——– |
The SS checks that the MS is transmitting on the correct frequencies and that the transmissions started in the correct frame. |
10 |
SS -> MS |
CHANNEL RELEASE |
For: K=1, R = 1,2,3 T(K) = T(1);
K=2, R = 1,2,3 T(K) = T(2);
K=3, R = 1,2,3 T(K) = T(3).
Specific Message Contents
IMMEDIATE ASSIGNMENT
Information Element |
value/remark |
L2 pseudo length |
value dependent on the length of the Mobile Allocation and thus on the number of channels in CA (1). |
Channel Description |
|
Channel type |
SDCCH/8 arbitrary offset, for R=1 |
and TDMA offset |
Bm + ACCHs for R=2 Lm + ACCHs arbitrary offset, for R=3 |
Timeslot number |
arbitrarily selected by |
TSC |
arbitrarily selected |
Hopping channel |
RF hopping channel |
MAIO |
MAIO(1) |
HSN |
0 |
Request reference |
corresponds to the Channel Request |
Timing advance |
30 bit periods |
Mobile Allocation |
corresponds to set MA(1) |
Starting Time |
not present |
IA rest octets |
all bits are set to spare |
FREQUENCY REDEFINITION (Description 1)
Information Element |
value/remark |
Protocol Discriminator |
RR Management |
Skip Indicator |
0000 |
Message Type |
00101011 |
Channel Description |
|
Channel type |
SDCCH/8 offset not changed, for R=1 |
and TDMA offset |
Bm + ACCHs for R=2 Lm + ACCHs offset not changed, for R=3 |
Timeslot number |
not changed |
TSC |
not changed |
Hopping channel |
RF hopping channel |
MAIO |
MAIO(2) |
HSN |
0 |
Mobile Allocation |
corresponds to set MA(2) |
Starting Time |
The last burst of the first L2 frame containing the beginning of this message is transmitted in frame number X. The starting time is set to frame number (X plus T(K) modulo 42 432). |
Cell Channel Description |
|
Information element identifier |
62H |
contents |
corresponds to set CA(2) encoded according to the table below. |
Band |
Cell Channel Description – coding format |
|
Step 6 |
Step 8 |
|
GSM 450 |
Range 128 |
Range 128 |
GSM 480 |
Range 128 |
Range 128 |
GSM 710 |
Range 128 |
Range 128 |
GSM 750 |
Range 128 |
Range 128 |
T-GSM 810 |
Range 128 |
Range 128 |
GSM 850 |
Range 128 |
Range 128 |
GSM 900 |
Bitmap 0 |
Bitmap 0 |
DCS 1 800 |
Variable bitmap |
K=1: Range 1 024 K=2: Range 256 K=3: Range 512 |
PCS 1 900 |
Variable bitmap |
K=1: Range 1 024 K=2: Range 256 K=3: Range 512 |