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Data (Coded MCS-1 and MCS-4 Downlink GMSK Burst - Advanced)

The MCS-1 and MCS-4 are coded DL Packet Data Transport Channels (PDTCH) that are 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 node are determined by the Channel Type, as defined in the Timeslot window, for the selected timeslot.

The timeslots shown below are set to show some of the available timeslot (channel) types, not to show a typical test configuration.

MCS-4 has similar parameters to the MCS-1 coded data, but MCS-1 has an uplink too.

Figure: Coded MCS-1 Downlink Data Nodes

1. Data (Normal GMSK Burst)

Tail Bits (3+3 bits)

Header USF

Header Data Exclude USF

Data

Training Sequence Bits (26 bits)

Guard Period (n bits)

E and FBI/TI

2. Control Frame

Data for Control Frame

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, Timeslot 0 is set up for a data cell with a Modulation Coding Scheme 1 (MCS-1) downlink burst.

1. Data (Coded Downlink MCS-1/MCS-4)

Tail Bits (3 + 3 bits)

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

Header USF

Range: 0 to 7

Default: 1

Double-click or use the drop-down menu to set the 3-bit Header USF (Uplink Status Flag) value.

Header Data Exclude USF

Choice: PN9 EXCEPT CPS | PN9 | PN15 | User Defined Bits

Default: PN9 EXCEPT CPS

Double-click or use theCloseddrop-down menu to set theClosedHeader Data Exclude USF.

(Refer to 3GPP 44060-6i0 section 10.0a.2)

(Refer to 3GPP 44060-6i0 section 10.3a)

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 unused RLC/MAC header fields.

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:

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.

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.  

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.

The training sequences selections are defined as follows:

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 setting 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

E and FBI/TI

Choice: On | Off

Default: Off

Double-click or use the drop-down menu to set the state. Sets the Extension (E) bit and either the Final Block Indicator (FBI) bit in the downlink or the TTLI Indicator (TI) bit in the uplink (See ClosedE and FBI/TI data block structure).

Figure: Components of the EGPRS RLC data block. (Refer to 3GPP 44.060, section 10.3a.)

2. Control Frame

Data for Control Frame

Choice: PN9 |PN15 | User Defined Bits

Default: PN9

Set the data for the control frame within a multiframe setup. Click the Details button in this cell to open the ClosedData Source Selection window. 

Select PN9, PN15 or User Defined Bits. Select User Defined Bits, to Closedcreate a data string.

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

If the Multiframe type parameter at the Carrier n node is set to 13 Multiframe with idle frame, the Data for Control Frame parameter, while appearing as active, has no effect since there is no control frame.

Related Topic

Timeslot (Advanced)