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Data (Coded TCH/FS GMSK Burst - Advanced)

The TCH/FS is a coded channel that is available with Option QFP.To open the Data node, click Data in the tree view. Use the Data window to define the bits in the bursts. The cells displayed in the Data section are determined by the Channel Type for the selected timeslot as defined in the Timeslot window.

Figure: Coded TCH/FS Data Node

1. Data (Normal GMSK Burst)

2. SACCH Contents

Tail Bits (3 + 3 bits)

SACCH State

Data

SACCH Tail bits

Stealing Flags (1 + 1 bits) (1 bit entry)

SACCH Validity Check

Training Sequence Bits (26 bits)

SACCH Encrypted Bits

Guard Period (n bits)

SACCH Power Control Level

Data Placement

SACCH Timing Advance

 

SACCH Layer 2 Frame

 

SACCH Spare

 

SACCH SR0

 

SACCH FPC_EPC

 

SACCH Stealing Flags (1+1 bits) (1 bit entry)

 

SACCH External Training Sequence

 

SACCH Guard period (n bits)

Change Data Values Button

Click to display a drop-down menu in which you can copy a timeslot configuration from one timeslot to another.

Data Node Parameters

Use the Data window to define the bits in the bursts. The cells displayed in the Data section are determined by the burst type (Timeslot Type) for the selected timeslot as defined in the Timeslots window. In the window shown above, Timeslots 0 is set up for a data cell with a Traffic Channel Full Speech Rate (TCH/FS) Burst.

1. Data (Coded TCH/FS)

Tail Bits (3 + 3 bits)

Tail bits are set by the software. This cell is not editable.

Data

Choice: PN9 |PN15 | User Defined Bits

Default: PN9

Click the Details button in this cell to open the ClosedData Source Selection window. 

Select an encoded PN9, PN15 or ClosedUser Defined Bits. The selected data is coded continuously across the RLC data block per the 3GPP standards. An independent version of the selected data is coded across the MAC header.

The buttons in this window are described in Marker Source Selection.

Import

Click Import to open a dialog box in which you can navigate to and import a pre-defined pattern file. The imported file automatically updates the user data entry area. The software accepts the following file types:

The maximum file size is 65536 bits. If the imported file is larger than 65536 bits, the software truncates the bits to conform to the maximum file size.

Export

Click Export to open a dialog box in which you can save the current data pattern to a file. You can save the data pattern as one of the following file types:

Clear

Click Clear to clear all data displayed in the user data entry area.

Insert PN9

Click Insert PN9 to insert a fixed psuedo-random bit sequence (pattern) containing 511 bits (29-1) into the user data entry area. The software generates this fixed pattern in accordance with the CCITT recommendation 0.153. You can click this button repeatedly to add additional PN9 sequences until the maximum file size is reached (65536 bits). If the maximum file size is exceeded, the software truncates the excess data. 

To edit the existing data pattern after reaching the maximum file size, insert the cursor at the desired point in the file and press Insert PN9 or use the keyboard 1 and 0 keys. The software inserts the data at the cursor position and truncates data in excess of 65536 bits.

Insert PN15

Click Insert PN15 to insert a fixed pattern psuedo-random bit sequence containing 32,767 bits (215-1) into the user data entry area. The software generates this fixed pattern in accordance with the CCITT recommendation O.153.

To edit the data pattern, insert the cursor at the desired point in the file and click Insert PN15, or enter the information manually using the keyboard keys 1 and 0. The software inserts the data at the cursor position and truncates all data in excess of 65536 bits.

To perform a receiver test with a continuous PN sequence, select PN9.

Stealing Flags (1 + 1 bits) (1 bit entry)

You can enter 1 or 0. The default is 0.

Training Sequence Bits (26 bits)

Default: TSCO

Click the Details button in this cell to open the ClosedData Source Selection window.

Select TSC0 to TSC7 or User Defined Bits to use for the training sequence bits.

The training sequences selections are defined as follows:

If you manually change a timeslot (channel type), the training sequence for that timeslot resets to TSC0 provided that the training sequence was not previously changed for the new channel type.

TSC0

0970897

TSC1

0B778B7

TSC2

10EE90E

TSC3

11ED11E

TSC4

06B906B

TSC5

13AC13A

TSC6

29F629F

TSC7

3BC4BBC

Select User Defined Bits to define Closedcustom training sequence bits.

The buttons in this window are described in Data.

Guard Period (n bits)

Guard period bits are set by the software. This cell is not editable.

Figure: Guard Period Lengths Between Different Timeslots

Burst Transition

Burst Transition Guard Period Between Timeslots (In terms of normal symbol periods)

TS0 and TS1 or

TS4 and TS5

Any other timeslot pair

normal symbol period to

normal symbol period

9

8

Data Placement

Choice: E4438C Opt402 | Consecutive Data for TCH/FS Classes with Rearranging | Consecutive Data for TCH/FS Classes

Default: E4438C Opt402

Double-click or use the drop-down menu to set the data placement type.

2. SACCH Contents

SACCH State

Choice: On | Off

Default: Off

Double-click or use the drop-down menu to set the channel state. If state is On, GMSK burst shall be used; If the state is Off, Dummy burst shall be used.

SACCH Tail bits

Tail Bits (3+3 bits)

B"000"+B"000" (always)

Tail bits are set by the software at 000. You can not edit this cell.

SACCH Validity Check

Choice: Valid | Invalid

Default: Valid

If Invalid is selected, a wrong CRC will be generated so that MS can not decode the SACCH correctly.

SACCH Encrypted Bits

Choice: STD | PN9 | PN15 | User Defined Bits

Default: STD

If the Closeddata source is set to STD, SACCH contents will be generated by user settings.

SACCH Power Control Level

Range: 0 to 31

Default: 15

Enter a value to set power control level.

SACCH Timing Advance

Range: 0 to 255

Default: 0

Enter a value to set timing advance for mobile station (MS).

SACCH Layer 2 Frame

Choice: PN9 | PN15 | User Defined Bits

Default: PN9

This is the content of the Closed21 octets field in downlink SACCH block structure.

Slow Associated Control Channel (SACCH) Blocks (Downlink) Frame Structure

The 23 octets of SACCH blocks are used in the downlink in the following way:

Figure: SACCH downlink block format for mobile station (MS) operating in A/Gb mode

SACCH Spare

SACCH spare bit is always 0. User can not edit this cell.

SACCH SR0

SACCH SR0 bit is always 0. User can not edit this cell.

SACCH FPC_EPC

SACCH FPC_EPC bit is always 0. User can not edit this cell.

SACCH Stealing Flags (1+1) (1 bit entry)

Stealing Flag for BCCH. It is always 1 (control channel). This setting is not editable.

SACCH External Training Sequence

Choice: TSC0 to TSC7 or User Defined Bits

Default: TSC0

Select TSC0 to TSC7 or User Defined Bits to use for the training sequence bits.

The training sequences are defined as follows:

TSC0: 0970897

TSC1: 0B778B7

TSC2: 10EE90E

TSC3: 11ED11E

TSC4: 06B906B

TSC5: 13AC13A

TSC6: 29F629F

TSC7: 3BC4BBC

SACCH Guard period (n bits)

The software sets the Guard period (bits). You cannot edit the value in this cell.

Figure: Guard Period Lengths Between Different Timeslots

Burst Transition

Burst Transition Guard Period Between Timeslots (In terms of normal symbol periods)

TS0 and TS1 or

TS4 and TS5

Any other timeslot pair

normal symbol period to

normal symbol period

9 (111111111)

8 (11111111)

Related Topic

Timeslot (Advanced)