Transcript
HP 8924C CDMA Mobile Station Test Set Official Release Firmware Revision A.06.25 Changes from Official Firmware version A.06.15 **Like version A.06.15, requires the 14.4 kbps Digital Cellsite Boards **
December 10, 1998 This firmware release note describes the new features added to the HP 8924C with firmware revision A.06.25. The key new features added are: ♦ ♦ ♦ ♦ ♦ ♦ ♦
Max_Slot_Cycle_Index Integer Field Slotted Mode Paging Default Programmable Channel Power Sample Interval Negative Time Offset Flexibility PCS Attenuator Changes FER Max Frames Minimum Setting of 25 New “Type” Field
These new features are documented on the following pages along with new HP-IB commands that have been implemented. Full documentation of these new features is available on the CD ROM or in the printed manuals listed below: HP Part Number Description
08924-90021 08924-90038 08924-90048 08924-90053 08924-90049
Application Guide User's Guide Condensed Prog Ref.Guide Reference Guide CD-ROM - Includes all the above manuals
NEW FEATURES ♦
Max_Slot_Cycle_Index Integer Field. A new field has been added to the CDMA Cell Cite Configuration Screen, called “Max Slot Cycle Index” that allows the user to dictate how often the HP 8924C sends pages to the mobile phone. This new field makes it possible for the user to enter slot cycle index values, ranging from 0 to 7. The Test Set will use the lesser of the value entered by the user and the slot cycle index of the phone when “MS ID” is set for “Auto” mode and the phone has registered. Otherwise, the setting is used ‘as is.’ In all cases, the value used corresponds to ‘x’in the following equation: time delay = (2^x) * 1.28 “Time delay” is the time, in seconds, between pages that the HP 8924C sends to the phone. Field Max Slot Cycle Index
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HP-IB Commands CDMA:CELL:CONFigure:MSCindex CDMA:CELL:CONFigure:MSCindex?
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Slotted Mode Paging Default. Normally, if a phone is a slotted mode phone, it must first register with the base station before it can be paged. However, in firmware revision, A.06.15, a change was made to slotted mode paging to allow paging a slotted mode phone before it has registered if the IMSI or Phone Number is pre-entered in the MS ID fields on the HP 8924C CDMA Call Control Screen. However, after power-cycling the 8924C, and before a slotted-mode phone had registered, it was found that the 8924C could not reliably page a slotted mode phone. As a solution, the HP 8924C will now always send all pages (and certain other paging channel messages) in slotted mode and ignore the slotted class of the phone. This will work for both slotted and non-slotted phones. The values entered for MNC, MCC, and MSIN under the MS ID field setting of IMSI are now used to page a phone which has not registered. The 8924 will now use these values plus slotted mode and the MAX slot cycle index field setting when IMSI is selected.
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Programmable Channel Power Sample Interval. A new field has been added to the TX Test Screen called “Chan Power Meas Intrvl.” This new channel power measurement interval field is only available when “Traffic Data Mode” is set to “Service Option 2” or “Service Option 9” and “Data Rate” is set to “full.” This new field can be programmed from 1 to 10 milliseconds. Previously, the channel power measurement interval was not programmable by the user and was set to 10 milliseconds. By decreasing the channel power measurement interval, the user can speed up the time it takes to do a channel power measurement. The down side is that if the interval is smaller, the measurement will be less accurate, since the channel power is being sampled and averaged over a smaller period of time. Field Chan Power Meas Intrvl
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Negative Time Offset Flexibility. Previously, phones with time offsets greater than -1.5 usec could not make phones calls with the HP 8924C. The HP 8924C is designed to emulate a real base station. Real base stations always experience positive time offsets from phones due to the travel time of the RF signal. A base station cannot tolerate large negative time offsets since its receiver fingers are not designed to slew in the negative direction. However, with the latest firmware, the HP 8924C can now make a call with a phone that has a normal time offset (i.e. standard HP 8924C mode-- approximately –1 usec), a time offset of up to –5 microseconds or a time offset of up to –10 microseconds. This is possible by setting the “time offset” field on the Configure Screen to the appropriate value. Thus, phones with large negative time offsets can be tested. Field Time Offset
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HP-IB Commands MEASure:CDManalyzer:CHANpower:INTerval MEASure:CDManalyzer:CHANpower:INTerval?
HP-IB Commands CONFigure:MMToffset CONFigure:MMToffset?
PCS Attenuator Changes. On the Configure Screen, another choice has been added to the “Input Atten” field. Previously, this field had three choices. It could automatically or manually be held at 0 dB, 20 dB or 40 dB, to attenuate high input power from the phone. When the HP 8924C’s output power was very high (greater than –35 dB), and when the HP 83236B’s RF IN/OUT port was being used, there would be leakage from the high output of RF IN/OUT to the input of RF IN/OUT. This problem has been resolved. The newest firmware adds a 20 dB Low Compression attenuator (automatically clicks on if “Input Atten” is set to “Auto”) that prevents leakage between the input and the output of the RF IN/OUT port. When the 20 dB LC attenuator was first added, it was also incorrectly clicking on when RF OUT only was used as the output port. Thus the HP 8924C’s output power was incorrectly being attenuated. This has been fixed, and the 20 dB LC attenuator now only clicks on when RF IN/OUT is being used and the HP 8924C’s output power is greater than –35 dBm.
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FER Max Frames Minimum Setting of 25. Previously, Max Frames on the RX TEST Screen could be set to a minimum of 100. Therefore, an FER sensitivity search would take a minimum of 100 frames to perform. Now, Max Frames has a minimum setting of 25. This will greatly reduce the time it takes to find the approximate value of the sensitivity of the phone. After the approximate amplitude is found by testing merely 25 frames, then the user can take more time to find the exact amplitude (sensitivity) for his desired Confidence and FER Specification.
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New “Type” Field. This new field is shown on the CDMA Call Control, CDMA Rx Test, CDMA Tx Test, and CDMA Power Transmitter Range Test Screens when Service Option 6 or 14 is selected. It sets the FOR_TRAFFIC and REV_TRAFFIC parameters in the HP 8924C to ‘0’if “None” is selected or ‘1’if “Primary” is selected. Field Type
HP-IB Commands CDMA:CALL:TRAFfic:TYPE CDMA:CALL:TRAFfic:TYPE?
FEATURES NOT IMPLEMENTED YET ♦
TIA/EIA-95-B Protocol Support. An upcoming firmware release (for purchase only as a firmware upgrade kit) will include support for TIA/EIA-95B protocol. This upgrade will add the TIA/EIA-95-B protocols required to implement the current functions in the HP 8924C. It will not, however, support all of the new features such as high speed data protocol that is part of the TIA/EIA-95B standard. It will use the TIA/EIA-95-B protocols that are required to place phone calls, do hard, softer, soft and CDMA to analog handoffs and other features as currently implemented in the HP 8924C. Other protocols supported include: access handoff, interband handoff, dynamic mobile thresholds and other mobile parameters.
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CDMA to NTACS Handoff. Previously, on the CDMA Call Control Screen, when “ARIB T53” was selected as the “Protocol”, the following choices would be available under the “System Type” field: JTACS, and AMPS. These were the systems types for which it was possible to perform a CDMA to analog handoff to. An upcoming firmware release will allow for digital CDMA to analog NTACS handoffs as well. That is, the following choices will be available under the “System Type” field: NTACS Narrow, NTACS Wide, JTACS, and AMPS.
DEFECTS FIXED ♦
Half Rate Sensitivity. In firmware revision A.06.15, the FER test could possibly report an invalid error when the forward traffic channel’s “data rate” was set to “half.” It was found that an interrupt was interfering with the reading of data and causing the invalid FER failures. This defect has been fixed.
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SMS on Half Rate Paging. In firmware revision A.06.15, there was a problem with SMS on half rate paging with slotted mode. The General Page overhead message would be received by the phone before any SMS Data Burst message. The phone would then go to sleep at the end of the overhead message and would never see the half rate paging channel SMS message. This defect has been fixed and the SMS Data Burst message now has priority over the General Page overhead message.
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Hard Handoff Failure in AMPS Mode. In firmware revision A.06.15, in AMPS mode, when two handoffs were done in a row, the second was failing. That is, even though the “Chan” Voice Channel Assignment field in the analog Call Control Screen would show the new channel, the spectrum showed that the handoff had not been made. During a handoff, the analog Call Control Screen’s status display indicators go from “Connect” to “Access” back to “Connect.” In this case, the second handoff was being commanded before the first was finished (i.e. before the “Access” status display indicator went back to “Connect”). Thus, the handoff was ignored. A change was made to the firmware so that changes cannot be made to any Voice Channel Assignment while a handoff execution is still in progress. The firmware will store the request until the status display indicator returns from “Access” back to “Connect” and the first handoff is complete.
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System Time. Every 42 times the command to change system time was being executed, an error was occurring. This has been changed and now works as expected.
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SAVE/RECALL on PCMCIA memory card. The HP 8924C was returning a firmware assert when the user tried to recall a state from a PCMCIA card that had been saved with a firmware revision in a form different than A.XX.XX or B.XX.XX. This is because the Test Set was unnecessarily checking to see if the host FW revision be of the form A.XX.XX or B.XX.XX. If it was not, the Test Set would return an assert. This unnecessary check has been taken out of the latest firmware.
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RECALL operation from Card Assert. When the HP 8924C was running in non-PCS mode and a user recalled from a card a saved state that contains either a signal generator or an analyzer frequency that requires the PCS mode, then an assert was occurring. The normal mechanism that prevents this behavior is: if the presence of a save state is dependent on an option for it to be active, then no effort is made to set the field during “recall.” However, since the fields for the setting of the signal generator and the analyzer frequency are not option dependent, another mechanism was added for these two fields to check the validity of the field settings during recall from a card. If the setting is out of valid range, the field is set to the default initial value. Note: This defect did not affect the recall of a save state from internal memory since recall is not allowed from internal memory if it is detected that the options present at the time of the save do not match the options present at the time of the recall.
Open Issues ♦
MS ID field used for SSD Update and Authentication Messages. Authentication Challenge and SSD Update require that the mobile is registered first. Registration gives us the ESN value which is then used in calculations that are part of the Authentication and SSD messages. The paging channel messages added for the SSD Update and Authentication features in firmware revision A.06.15 did not use the MS ID field to determine their addresses. Consequently, they could be sent only to phones that have registered and could not be used to test the phone's response to different addresses. These messages are: Data Burst Message, Authentication Challenge Message, and SSD Update Message. A temporary workaround should be to let the phone register before sending these messages.
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