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