Enhanced Traffic Parameters
Last updated: July 22, 2008
This section is only applicable to the lab application and to a test application with the required feature license.
The Enhanced Traffic Parameters menu provides access to the configurable attributes for the Enhanced Forward Traffic Channel MAC and Subtype 3 Reverse Traffic Channel MAC protocols that are used with the subtype 2 physical layer protocol. To determine when the test set supports these protocols, see
Current Physical Layer Subtype and Associated Protocols
.
Auxiliary Pilot Channel Min Payload
The Auxiliary Pilot channel (R-Aux Pilot) is transmitted by the AT when operating at high data rate to aid AN for reverse signal demodulation. When the test set is in the Active Cell operating mode with
Release A Physical Layer Subtype
set to Subtype 2, the
Auxiliary Pilot Channel Min Payload
specifies the minimum R-Data payload size (roughly corresponding to the data rate) at which point the AT is required to transmit the R-Aux Pilot channel. That is, when the AT is transmitting at a data rate (determined by
R-Data Pkt Size
) no less than the
Auxiliary Pilot Channel Min Payload
, the AT is expected to transmit the R-Aux Pilot channel.
The
Auxiliary Pilot Channel Min Payload
is a "Configurable Attribute" that is used to set part of the AuxiliaryPilotChannelParameters attribute for the Subtype 3 Reverse Traffic Channel MAC Protocol. It is negotiated with the AT during session negotiation. When a session is open, changing the
Auxiliary Pilot Channel Min Payload
results in a session re-negotiation. See
Session Negotiate State
for details.
If the R-Aux Pilot channel is transmitted, the
Auxiliary Pilot Channel Gain
is used to control the power of the R-Aux Pilot Channel.
Operating Considerations
-
The test set can demodulate the reverse signal when R-Pilot takes up certain amount of the total received power. If you set the current TxT2P gain (see
TxT2P Gain Settings
) very high but keep the AT from transmitting the R-Aux Pilot channel, the test set may not be able to demodulate the reverse signal. For example. when you set the AT to transmit 8192 bits packet at high TxT2P gain, no R-Aux Pilot is transmitted if the Auxiliary Pilot Channel Min Payload is set to 12288 bits. In this case, the test set may not be able to demodulate the reverse signal.
DSC Length
DSC Length
determines the length of a single DSC transmission (in units of 8 slots). It is a "Configurable Attribute" that is used to set DSCLength attribute for the Enhanced Forward Traffic Channel MAC protocol. It is negotiated with the AT during session negotiation. When a session is open, changing the
DSC Length
results in a session re-negotiation. See
Session Negotiate State
for details.
The R-DSC channel is expected to be transmitted from the AT when
Release A Physical Layer Subtype
is set to subtype 2. The R-DSC channel is used by the AT to indicate to the AN the selected serving cell on the Forward Channel. The serving cell is indicated by the DSC value for that cell. The DSC value takes effect one slot after the end of its transmission and stays in effect for
DSC Length
slots. When the DSC channel is transmitted, its power is controlled by the
DSC Channel Gain
.
Short Packet Enabled Threshold
Short Packet Enabled Threshold
determines the threshold that allows for use of the non-canonical transmission formats for the forward traffic channel (for subtype 2 physical layer) per the DRC value requested by the AT. It is applicable when the test set is in the Active Cell operating mode with
Protocol Rel
set to A (1xEV-DO-A) and the
Release A Physical Layer Subtype
set to Subtype 2.
-
If the canonical packet size for the received DRC value is less than the specified
Short Packet Enabled Threshold
value, the non-canonical (short packet) formats for the DRC value can be used. For details on the canonical and non-canonical forward transmission formats for a DRC value, see
DRC Value and Forward Transmission Formats
.
-
If any of the following conditions happen, an error message "Digital856 call processing settings deferred: Short Packets Enabled Threshold incompatible with forward traffic configuration" is posted. When the error is present, the test set uses the canonical transmission format for the received DRC value regardless of the user settings (
F-Traffic Config
or
F-Traffic Format
).
Short Packet Enabled Threshold
is a "Configurable Attribute" for the Enhanced Forward Traffic Channel MAC protocol. It is negotiated with AT via the ShortPacketsEnabledThresh attribute during session negotiation. When a session is open, changing this setting results in a session re-negotiation. See
Session Negotiate State
for details.
Operating Considerations
-
The test set defaults the
Short Packet Enabled Threshold
to 4096 bits. This allows for all non-canonical (short packet) formats. It is not expected to be changed unless some ATs failed to open a session with this value. The default value set in the test set is not the protocol default value (2048 bits) as defined in the C.S0024-A. This opens the possibility of session failure for some ATs that only support the protocol default value. In this case, you may need to change the
Short Packet Enabled Threshold
to the value supported by your AT.
-
Signaling messages are always sent in the canonical format. This is to avoid the Signaling Link Protocol (SLP) from having to make very small fragments for the signaling messages that would be required with some non-canonical formats and forced single encapsulation (required for Test Applications).
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