ACK Channel Bit Fixed Mode Attribute

Last updated: September 4, 2009

The ACK Channel Bit Fixed Mode Attribute (Fwd/Rev TAP) parameter can be applied to differenct configurations of the test set:

• When the test set is configured to subtype 0 and Test Application Protocol , the test set sends FTAP Parameter Assignment Message and RTAP Parameter Assignment Message to the AT. The ACK Channel Bit Fixed Mode Attribute controls whether the AckChannelBitFixedMode attribute is included in the FTAP Parameter Assignment Message or not. ACK Channel Bit Fixed Mode Attribute (Fwd TAP) is only applicable under FTAP while ACK Channel Bit Fixed Mode Attribute (Rev TAP) is only applicable under RTAP.
• When the test set is configured to subtype 2 and Enhanced Test Application Protocol , the test set sends FETAP Parameter Assignment Message and RETAP Parameter Assignment Message to the AT. The ACK Channel Bit Fixed Mode Attribute controls whether the AckChannelBitFixedMode attribute is included in the FETAP Parameter Assignment Message . ACK Channel Bit Fixed Mode Attribute (Fwd TAP) is only applicable under FETAP while ACK Channel Bit Fixed Mode Attribute (Rev TAP) is only applicable under RETAP.

  If the FETAP Parameter Assignment Message is sent, the ACK Channel Bit Fixed Mode Attribute is also used to control whether the ACKChannelModulationTypeFixedMode attribute (see ACK Channel Modulation Type ) is included in the FETAP Parameter Assignment Message .

• When the test set is configured to subtype 3 and Multi-carrier Test Application Protocol , the test set sends FMCTAP Parameter Assignment Message and RMCTAP Parameter Assignment Message to the AT. The ACK Channel Bit Fixed Mode Attribute controls whether the AckChannelBitFixedMode attribute is included in the FMCTAP Parameter Assignment Message . ACK Channel Bit Fixed Mode Attribute (Fwd TAP) is only applicable under FMCTAP while ACK Channel Bit Fixed Mode Attribute (Rev TAP) is only applicable under RMCTAP.

  If the FMCTAP Parameter Assignment Message is sent, the ACK Channel Bit Fixed Mode Attribute is also used to control whether the ACKChannelModulationTypeFixedMode attribute (see ACK Channel Modulation Type ) is included in the FMCTAP Parameter Assignment Message .

Moreover, when the ACK Channel Bit Fixed Mode Attribute is set to:

• On

  In this mode, the ACKChannelBitFixedMode attribute is included in the FTAP Parameter Assignment Message , FETAP Parameter Assignment Message or FMCTAP Parameter Assignment Message sent to the AT. This means the access terminal must transmit the R-ACK channel in every slot and set the transmitted ACK Channel bit to the value specified by the ACKChannelBit field in the ACKChannelBitFixedMode attribute (ACKChannelBit field is fixed to 1 (Nak) by the test set. See Fixed Settings ).

• Off

  In this mode, the ACKChannelBitFixedMode attribute is NOT sent in the FTAP Parameter Assignment Message, FETAP Parameter Assignment Message or FMCTAP Parameter Assignment Message . This means the access terminal acknowledges forward test packets addressed to it as in normal system operation. That is, the access terminal transmits a positive acknowledgment (Ack) on the R-ACK channel if it successfully receives a packet addressed to it on the Forward Traffic Channel. Otherwise, the access terminal transmits a negative acknowledgment (Nak) on the ACK channel. A Forward Traffic Channel physical layer packet is considered successfully received if it has a valid FCS (frame check sequence). The forward test packets addressed to the AT is controlled by the AT Directed Packets . If no forward test packet is addressed to it, the AT does not transmit the R-ACK.

In order for the R-ACK Channel to be active in all slots, you must set ACK Channel Bit Fixed Mode Attribute to on.

To force the AT not to transmit the R-ACK Channel in any slots, you must set the ACK Channel Bit Fixed Mode Attribute to off and AT Directed Packets to 0% so that the AT does not receive any forward test packets to acknowledge. (It is not necessary to set AT Directed Packets to 0% if Test Application Protocol is set to RTAP and Limited TAP is on. In this state, the test set does not transmit any forward test packets. See Transmit Forward Test Packets? .) The TROLPC measurement requires the AT not to transmit the R-ACK channel (see Time Response of Open Loop Power Control (TROLPC) Measurement Description ).

ACK Channel Bit Fixed Mode Attribute can be changed at any time, and the test set will immediately send an FTAP/FETAP/FMCTAP Parameter Assignment Message to reflect the setting.

The test set ranges its receiver as if the R-ACK Channel is always present in every slot (even if no R-ACK channel is transmitting). See Expected Power .

The ACK Channel Bit Fixed Mode Attribute is displayed on the Call Setup screen in the Application Configuration window when the Session Application Type is set to Test Application in the Active Cell operating mode.