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Compressed Mode

Use of a compressed mode (Slotted Mode) is necessary when making measurements on another frequency (inter-frequency) or on a different radio technology (inter-RAT). In the Compressed Mode, while the transmission and reception are stopped for a short time, the measurements are performed on another frequency or Radio Access Technology (RAT) during the transmission and reception stop time. After the stop time is over, the transmission and reception resumes. To ensure that the data is not lost, the data is compressed in the frame, creating empty space where the measurements can be performed.

Click Compressed Mode in the Closedtree view to access parameters in the General Settings table. The Closeddiagram below the table updates as you make changes to the configuration.

Compressed mode is only available for the Advanced W-CDMA/HSPA+ Downlink Release 10 carrier.

General Settings

State

Choice: Off | On

Default: Off

Turns the DPCH compressed mode on or off. When DPCH compressed mode is on, ALC will turn off and only 1 DPCH channel is active. The timing offset for the DPCH channel is supported when compressed mode is on.

Compressed Mode Method

Choice: SF/2 | Higher Layer

Default: SF/2

Sets the DPCH compressed mode method. When set to Higher Layer, transport layer coding is supported with the Transport Position choice of Flexible.

Downlink Reference Compressed Mode Parameter

Choice: Reference Parameter 1.1 | Reference Parameter 1.2 | Reference Parameter 2.1 | Reference Parameter 2.2

Default: Reference Parameter 1.1

Sets the downlink reference compressed mode parameter defined in 3GPP standard TS25.101.

Power Offset

Range: 0 to 6

Default: 0

Sets the power offset (dB) for the compressed frame.

Frame Structure

Choice: TypeA | TypeB

Default: TypeA

Selects the frame structure type.

TGCFN

Range: 0 to 255

Default: 0

Sets the connection frame number (CFN) of the first radio frame of the first pattern within the transmission gap pattern.

TGL1

Choice: 3 | 4 | 5 | 7 | 10 | 14

Default: 7

Sets the TGL1 value, expressed in number of slots.

TGL2

Choice: 0 (TGL2=TGL1) | 3 | 4 | 5 | 7 | 10 | 14

Default: 0 (TGL2=TGL1)

Sets the TGL2 value, expressed in number of slots. If the value is set to 0 (omitted), then TGL2 = TGL1.

TGSN

Range: 0 to 14

Default: 3

Sets the transmission gap starting slot number (TGSN). TGSN is the slot number of the first transmission gap slot in the first radio frame of the transmission gap pattern.

TGPRC

Choice: 0 (infinite) to 511

Default: 0 (infinite)

Sets the number of transmission gap patterns in the transmission gap pattern sequence. Set TGPRC to 0 for infinite pattern repetition.

TGPL1

Range: 1 to 144

Default: 2

Sets the transmission gap pattern length (TGPL1), expressed in number of frames.

TGD

Range: 0 (undefined), 15 to 269

Default: 0 (undefined)

Sets the transmission gap start distance (TGD), which is the duration between the starting slots of two consecutive transmission gaps within a transmission gap pattern, expressed in number of slots. If TGD = 0, then only one transmission gap is available in the transmission gap pattern.