Enhanced Traffic Parameters

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.

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).

Related Topics


GPIB Command:

Manual Operation: How Do I Change Channel Gain/Traffic Info Parameters? (Enhanced Traffic Parameters menu)