Data Counters

Data Counters

To Clear Data Counters

All of the data counters (including DOS, RLP and IP) will be cleared when the test set performs a power-up or full preset. You can also clear the RLP counters and IP counters individually (see How Do I Access the Data Counters? ).

Traffic Channel Packet Info Screen

Two sets of counters are available on the Traffic Channel Packet Info screen:

• Forward Packets per DRC counters record the physical layer packets being sent on the forward traffic channel at each specific transmission format (data rate or packet size).

  Total Directed counter records the total number of forward traffic packets that were directed to the AT under test. Not Directed counter records the total number of forward traffic packets that were not directed to the AT under test (that is, directed to a non-existent AT via a different MAC Index. See AT Directed Packets for more description).

• Reverse Packets per Data Rate or Packet Size counters record the physical layer packets being received on the reverse traffic channel at each specific data rate or packet size. Null packets indicate the packets that do not contain traffic data.

When a data connection is established, all these counters keep a running count of the traffic packets sent at each specific transmission format since the counters were cleared. The counters are updated approximately once every second. When the counters reach their maximum value (100,000,000), they automatically reset to zero and resume the counting.

• For subtype 0 physical layer, when a TAP (Test Application Protocol) or DPA (Default Packet Application) data connection is established, the Traffic Channel Packet Info screen is displayed as shown in the Traffic Channel Packet Information (for Subtype 0 Physical Layer) .
  • For a TAP test data connection (see Test Application Protocol ), the AT always requests the forward data rate as specified by the FTAP Rate and transmits the reverse test packet at a rate as specified by the RTAP Rate .
  • For a DPA data connection (see Session Application Type ), the forward and reverse data rates are determined based on the actual radio link conditions. For example, when you change the Cell power or add an AWGN (Additive White Gaussian Noise) power (see Cell Power, AWGN (Additive White Gaussian Noise) Power and Total RF Power ), you will see that the forward and reverse data rates requested or indicated by the AT are varied.

  Traffic Channel Packet Information (for Subtype 0 Physical Layer)

  
• For subtype 2 physical layer, when an ETAP (Enhanced Test Application Protocol), DPA (Default Packet Application), MFPA (Multi-Flow Packet Application) or EMPA (Enhanced Multi-Flow Packet Application) test data connection is established, the Traffic Channel Packet Info screen is displayed as shown in the Traffic Channel Packet Infomation (for Subtype 2 Physical Layer) . In addition to reverse packets per Packet Size, the test set will also count the number of reverse packets transmitted in High Capacity transmission mode, Low Latency transmission mode and the total (See Reverse Data Transmission Mode for details) on the reverse traffic channel.
  • For an ETAP test data connection (see Enhanced Test Application Protocol ), the F-Traffic Format (if DRC Value Fixed Mode Attribute is on) or the F-Traffic Config (if DRC Value Fixed Mode Attribute is off) is used to control the forward packet transmission format. The R-Data Pkt Size is used to control the reverse data packet size.
  • For a DPA, MFPA or EMPA data connection (see Session Application Type ) in subtype 2 physical layer (see Release A Physical Layer Subtype ), the forward and reverse data rates are determined based on the actual radio link conditions. For example, when you change the Cell power or add an AWGN (Additive White Gaussian Noise) power (see Cell Power, AWGN (Additive White Gaussian Noise) Power and Total RF Power ), you will see that the forward and reverse data rates requested or indicated by the AT are varied.

  Traffic Channel Packet Infomation (for Subtype 2 Physical Layer)

  

F-Traffic Packet Failure Counters Information

Forward Traffic Packet Failure per DRC counters record the physical layer packets transmitted by the test set where the preamble was detected by the AT but were not successfully demodulated by the AT at the physical layer, the pakcets are sent on the forward traffic channel at each specific transmission format (data rate or packet size).

Total Directed counter records the total number of forward traffic packets that were directed to the AT under test.

When a data connection is established, all these counters keep a running count of the packets sent at each specific transmission format since the counters were cleared. The counters are updated approximately once every second. When the counters reach their maximum value (100,000,000), they automatically reset to zero and resume the counting.

• For subtype 0 physical layer, when a TAP (Test Application Protocol) or DPA (Default Packet Application) data connection is established, the Traffic Channel Packet Info screen is displayed as shown in the F-Traffic Packet Failure Infomation (for Subtype 0 Physical Layer) .
  • For a TAP test data connection (see Test Application Protocol ), the AT always requests the forward data rate as specified by the FTAP Rate and transmits the reverse test packet at a rate as specified by the RTAP Rate .
  • For a DPA data connection (see Session Application Type ), the data rates are determined based on the actual radio link conditions. For example, when you change the Cell power or add an AWGN (Additive White Gaussian Noise) power (see Cell Power, AWGN (Additive White Gaussian Noise) Power and Total RF Power ), you will see that the forward and reverse data rates requested or indicated by the AT are varied.

  F-Traffic Packet Failure Infomation (for Subtype 0 Physical Layer)

  
• For subtype 2 physical layer, when an ETAP (Enhanced Test Application Protocol), DPA (Default Packet Application), MFPA (Multi-Flow Packet Application) or EMPA (Enhanced Multi-Flow Packet Application) test data connection is established, the Traffic Channel Packet Info screen is displayed as shown in the F-Traffic Packet Failure Counters Infomation (for Subtype 2 Physical Layer) .
  • For an ETAP test data connection (see Enhanced Test Application Protocol ), the F-Traffic Format (if DRC Value Fixed Mode Attribute is on) or the F-Traffic Config (if DRC Value Fixed Mode Attribute is off) is used to control the forward packet transmission format. The R-Data Pkt Size is used to control the reverse data packet size.
  • For a DPA, MFPA or EMPA data connection (see Session Application Type ) in subtype 2 physical layer (see Release A Physical Layer Subtype ), the forward and reverse data rates are determined based on the actual radio link conditions. For example, when you change the Cell power or add an AWGN (Additive White Gaussian Noise) power (see Cell Power, AWGN (Additive White Gaussian Noise) Power and Total RF Power ), you will see that the forward and reverse data rates requested or indicated by the AT are varied.

  F-Traffic Packet Failure Counters Infomation (for Subtype 2 Physical Layer)

  

F-Traffic Packet Missed Preamble Counters Info

Forward Traffic Packet Missed Preamble per DRC counters record the physical layer packets transmitted by the test set where the AT appears to not have successful demodulated the preamble, the pakcets are sent on the forward traffic channel at each specific transmission format (data rate or packet size).

Total Directed counter records the total number of forward traffic packets that were directed to the AT under test.

When a data connection is established, all these counters keep a running count of the packets sent at each specific transmission format since the counters were cleared. The counters are updated approximately once every second. When the counters reach their maximum value (100,000,000), they automatically reset to zero and resume the counting.

• For subtype 0 physical layer, when a TAP (Test Application Protocol) or DPA (Default Packet Application) data connection is established, the Traffic Channel Packet Info screen is displayed as shown in the F-Traffic Packet Missed Preamble Counters Info (for Subtype 0 Physical Layer) .
  • For a TAP test data connection (see Test Application Protocol ), the AT always requests the forward data rate as specified by the FTAP Rate and transmits the reverse test packet at a rate as specified by the RTAP Rate .
  • For a DPA data connection (see Session Application Type ), the data rates are determined based on the actual radio link conditions. For example, when you change the Cell power or add an AWGN (Additive White Gaussian Noise) power (see Cell Power, AWGN (Additive White Gaussian Noise) Power and Total RF Power ), you will see that the forward and reverse data rates requested or indicated by the AT are varied.

  F-Traffic Packet Missed Preamble Counters Info (for Subtype 0 Physical Layer)

  
• For subtype 2 physical layer, when an ETAP (Enhanced Test Application Protocol), DPA (Default Packet Application), MFPA (Multi-Flow Packet Application) or EMPA (Enhanced Multi-Flow Packet Application) test data connection is established, the Traffic Channel Packet Info screen is displayed as shown in the F-Traffic Packet Missed Preamble Counters Info (for Subtype 2 Physical Layer) .
  • For an ETAP test data connection (see Enhanced Test Application Protocol ), the F-Traffic Format (if DRC Value Fixed Mode Attribute is on) or the F-Traffic Config (if DRC Value Fixed Mode Attribute is off) is used to control the forward packet transmission format. The R-Data Pkt Size is used to control the reverse data packet size.
  • For a DPA, MFPA or EMPA data connection (see Session Application Type ) in subtype 2 physical layer (see Release A Physical Layer Subtype ), the forward and reverse data rates are determined based on the actual radio link conditions. For example, when you change the Cell power or add an AWGN (Additive White Gaussian Noise) power (see Cell Power, AWGN (Additive White Gaussian Noise) Power and Total RF Power ), you will see that the forward and reverse data rates requested or indicated by the AT are varied.

  F-Traffic Packet Missed Preamble Counters Info (for Subtype 2 Physical Layer)

  

Traffic Channel Packet Histogram

As shown in the figure below, the Traffic Channel Packet Histogram screen uses both the bar graph and tabular data to show the forward traffic activity (per each DRC) when a data connection is established. The histogram screen only displays the forward traffic activity (the total number of forward traffic packets that is transmitted by the test set to the AT for the given DRC and transmission format) during the last (most recent) Time Span period.

• The Time Span can be specified from 1 to 30 seconds. The Traffic Channel Histogram counters will be cleared whenever the Time Span is changed.
• The Traffic Channel Histogram graph can be paused and resumed with the Freeze Histogram and Resume Histogram . Note that the freezing action only pauses the display and does not stop the test set from counting. Once resumed, the Histogram display are updated to the last Time Span seconds of records based on the internal counters which continued to update while the histogram results were paused.
• A marker can be placed at a particular DRC to observe the associated instantaneous statistic results. The marker value is displayed at top of the graph and also highlighted in the table below the graph. Note that when operating at the subtype 2 physical layer, the test set counts all of the packets at that DRC (including canonical and short packets transmission formats). The marker value displayed at the top of the graph provides individual results for each of the transmission format at that DRC. The tabular data gives the total number of packets transmitted at that DRC and transmission format. Markers can be used in conjunction with the Freeze Histogram feature to analyze the forward data packets transmitted at a particular DRC at a particular time.
• The green line on the histogram indicates the theoretical maximum number of packets that can be sent at that DRC during the specified time span. It is calculated by 600*time_span/num_slots, 600 is the number of slots transmitted in one second, time_span is equal to the specified Time Span in seconds and num_slots is the number of slots required to send a packet at that DRC and transmission format. (Note that even at 100% AT Directed Activity and no early termination the histogram bars can never reach the green line because control packets transmitted on the traffic channel are not counted).

To Clear Traffic Channel Packet Counters

The following operations will clear all of the counters on the Traffic Channel Packet Info Screen and the Traffic Channel Packet Histogram :

• the test set performs a power-up, full preset, or measurement reset;
• the Current Physical Layer Subtype (see Release A Physical Layer Subtype ) is changed;
• you press the F3 ( Clear Traffic Counters ) key or send the CALL:COUNt:CLEar:MS:TRAFfic command.

In addition to above operations, the Histogram counters can also be cleared by:

• pressing the F3 ( Clear Histogram ) key or sending the CALL:COUNt:CLEar:MS:TRAFfic:HISTogram command;
• changing the histogram Time Span with F1 key or the CALL:COUNt:MS:DRC:RX:HISTogram:SPAN .

Forward Link Sent Multi-Flow Counters Info

Reverse Link Received Multi-Flow Counters Info

To clear Data Counters

All of the data counters (including RLP and Ip) will be cleared when the test set performs a power-up or full preset. You can also clear the RLP counters and Ip counters individually (see How Do I Access the Data Counters? ).