Measurement Reports
Last updated: January 18, 2010
Measurement reports are values reported from the MS that contain information about channel quality. Measurement reports assist the network in making handover and power control decisions.
There are six measurement report screens, SACCH and Network Control Measurement Reports have two screens (General and Enhanced Measurement Reports) each.
- Summary Measurement Reports
- SACCH Measurement Reports
- PACCH Measurement Reports
- Network Control Measurement Reports
Measurement reports are available for all data connection types. However, when using the ETSI Test Mode A data connection, results are available for the initial establishment of the connection only. The downlink TBF is released in ETSI Test Mode A. Therefore, there is no signal for the MS to measure and no updates to the report during the connection.
The SACCH Measurement Reports and the Network Control Measurement Reports allow you to query the NEW or LAST results for a specific parameter. See SACCH NEW? and [:LAST?] Queries and Network Control :NEW? and [:LAST]? Queries for more details.
You can configure measurement report parameters used to influence the type and rate of the measurement reports performed by the Mobile Station. See Configuring Measurement Report for more details.
The measurement reports are available only in Active Cell Operating Mode .
Summary Measurement Reports
The Summary Measurement Reports screen provides a summary of important results for all types of measurement reports on a single screen. This screen displays SACCH, PACCH, and Network Control measurement reports. This screen is particularly useful for DTM connections since this mode requires all three types of measurement reports. Additional information can be found in the separate measurement report screens. See the following sections for more information on each type of measurement report screen.
SACCH Measurement Reports
When the test set receives SACCH data from the mobile station, results are reported to you in the SACCH Measurement Reports screen.
SACCH data is reported any time there is a downlink TCH and the mobile station is synchronized to the test set transmitting a valid SACCH on the uplink. SACCH Reports are reported when the TBF not active.
There are two SACCH Measurement Report screens:
- General SACCH Reports Screen , the screen displays reports for all types of SACCH reports except the neighbour cell information from Enhanced Reports. The neighbour cell reports part of this screen includes only "normal" reports but the Serving Cell part of the screen includes both normal and enhanced reports. The Mobile Station only returns measurement reports on up to 6 GSM and 3G FDD neighbour cells during the reporting period. The neighbour cell listed in the screen are listed decending order of the Report That is, the neighbour cell with the highest RX Level is reported as Neighbour Cell 1.
-
Enhanced SACCH Neighbour Reports Screen
, the screen is only populated with results when the Report Type is set to
Enhanced, the Mobile Station returns measurement reports on up to 16 GSM and 13 3G FDD neighbour cells during the reporting period. The neighbour cell information is displayed in the same order as specified in the neighbour cell lists of the test set, the Test set does not attempt to order the neighbour cell information the Mobile Station returns.
You can set the report type through configuration of the Report Type parameter. See
Configuring Measurement Report
. The type of report actually returned from the Mobile Station is displayed by the
Report Type
field on this screen.
| NOTE |
General SACCH Reports Screen
The following figure shows the General SACCH Measurement Reports screen. This screen displays Serving Cell Reports (such as Timing Advance, TX Level, RX Level, and RX Quality) and Neighbour Cell Reports (which contain the RAT, (U)ARFCN, NCC, BCC, SC(3G FDD), Report and Quantity of each neighbour cell). The Mobile Station returns information on up to 6 GSM or 3G FDD neighbour cells during the reporting period for General SACCH Measurement Reports.
Serving Cell Reports
- Timing advance - The actual Timing advance value being used by the mobile station. This result should reflect the value set in the Call Parms, TCH Parms, Timing Advance field.
- TX Level - The actual Tx Level being used by the mobile station. This result should reflect the value set in the Call Parms, TCH Parms, MS TX Level field.
- RX Level (Full and Sub)- The power level corresponding to the average received signal level of the downlink TCH as measured by the mobile station during the preceding SACCH interval. See also Full and Sub Receiver Reports .
- RX Qual (Full and Sub)- The level corresponding to the mobile station's perceived quality of the downlink signal during the preceding SACCH interval. See also Full and Sub Receiver Reports .
Neighbour Cell Reports
The mobile station determines what neighbour cells to measure from the BA tables and 3G FDD cell list. The test set reports the results returned for up to six neighbour cells.
- Neighbour RAT results reflect the Radio Access Technology reported by the mobile station in the SACCH report.
- Neighbour channel results reflect the GSM neighbour cell ARFCN or 3G FDD neighbour cell UARFCN reported by the mobile station in the SACCH report.
- Neighbour NCC results reflect the network color code reported by the mobile station in the SACCH report. The NCC column always display "----" for 3G FDD neighbour cells as they are only relevant for GSM neighbour cells.
- Neighbour BCC results reflect the base station color code reported by the mobile station in the SACCH report. The BCC column will always display "----" for 3G FDD neighbour cells as they are only relevant for GSM neighbour cells.
- Neighbour SC (3G FDD) results reflect the 3G FDD neighbour cell scrambling code reported by the mobile station in the SACCH report. The SC column will always display "----" for GSM neighbour cells as they are only relevant for 3G FDD neighbour cells.
- Neighbour Rx Lev results reflect the GSM neighbour cell power level reported by the mobile station in the SACCH report.
- Neighbour Report results reflect the actual measurement result from measurements performed on the neighbour cell. The meaning of this result differs depending on the type of RAT being reported. The Quantity column used to further elaborate on the quantity of the report.
-
Neighbour Quantity results reflect the 3G FDD neighbour cell report quantity reported by the mobile station in the SACCH report. For GSM neighbour cell reports the quantity column always shows
Rx Levof the cell; For 3G FDD neighbour cell reports the quantity column shows eitherRCSPorEc/Nodepending on the value of the FDD_REPORTING_QUANTITY parameter. See Configuring Measurement Report for more details.
The Quantity results may also be "RSSI" if the DUT has been instructed to perform RSSI measurement reporting on a particular UARFCN, in such a case, the DUT perform a broadband power measurement rather than measuring a particular cell, no scrambling code is returned.NOTE
Enhanced SACCH Neighbour Reports Screen
The following figure shows the Enhanced SACCH Measurement Reports screen. This screen displays Reports for up to a maximum 29 valid neighbour cells (16 GSM and 13 3G FDD cells). The GSM neighbour cell report contains ARFCN, BCC, NCC, Rx Lev of each neighbour cell, the 3G FDD neighbour cell report contains UARFCN, SC, Report and Quantity of each neighbour cell.
Querying the SACCH Reports
You can retrieve the results remotely using the following queries. No mechanism is provided to turn off SACCH data reports.
FullandSubReceiver ReportsThe SACCH Measurement Reports return both Full and Sub measurement reports for the RX Level and the RX Quality. Full and Sub indicate whether the returned measurement results are obtained from the full (
Full) set of the TCH and SACCH TDMA frames or a subset (Sub) of four SACCH frames. See 3GPP TS 05.08 section 8.4.1 for more information.SACCH NEW? and [:LAST?] Queries
:NEW? queries hang until a new message is received by the test set or until the SCPI control device timeout occurs. The mobile station issues data updates on the SACCH every 480 ms, (4 frames).
Measurements made during this four frame period are averaged and the result of these averaged measurements are reported by the mobile station during the next period. Measurements must be stable in order to give valid (stable) results for a :NEW? query. Therefore, it may take up to three reports before a reported value accurately reflects a change to any of its parameters. See SACCH Report Measurement Cycle.
After changing measurement parameters, you must send three consecutive :NEW? queries to obtain stable, accurate results. By querying :NEW? three times the value becomes stable for the second query, and meaningful stable results are then reported for the third query. The results from the first two queries should not be used.
If several SACCH reported values are needed from the same report, the first value needed should be queried three times (to receive a stable new report). Then the additional values should be immediately queried using the :LAST? query before the next report arrives or the measurement parameters are changed again.
The :LAST? query is not a hanging query; values are returned from the last SACCH report. As shown in the following program example (line 60), the :LAST? command is optional. If :NEW? is not used in the MS:REPORTED command, the :LAST value is automatically reported.
Programming Example
10 OUTPUT 714;"CALL:CELL:POW -83" 20 OUTPUT 714;"CALL:MS:TADV 11" 30 OUTPUT 714;"CALL:MS:TXL 11" 40 OUTPUT 714;"CALL:MS:REP:MEAS:SACCH:TXL:NEW?;NEW?;NEW?" 41 ! Query 3 times 50 ENTER 714;Ignore_result,Ignore_result,Valid_result 51 ! Only use Valid_result 60 OUTPUT 714;"CALL:MS:REP:MEAS:SACCH:RXL?;TADV?" 61 ! The last RX Level and Timing advance reported by the MS. 70 ENTER 714;Rx_level,Timing_adv 80 END
PACCH Measurement Reports
PACCH measurements are only applicable to GPRS and EGPRS. The following figure shows the PACCH Measurement Reports screen when the system type is GPRS (left) and EGPRS (right).
You can query the values returned in the PACCH measurement reports using the following commands:
Network Control Measurement Reports
Network Control Reports are reported when the mobile station is attached to the test set.
NOTE: The Network Control Measurement Reports are returned by the mobile station only when the Network Control Order is set to
NC1
or
NC2
. See
CALL[:CELL]:BCHannel:NCORder
for a description of the Network Control Order and the GPIB command used to configure the Network Control Order.
There are two Network Control Measurement Report screens:
- General Network Control Measurement Reports Screen , the screen displays reports for all types of Network Contrl Measurement Reports except the neighbour cell information from Enhanced Reports. The neighbour cell reports part of this screen includes only "normal" reports but the Serving Cell part of the screen includes by both normal and enhanced reports. The Mobile Station only returns measurement reports on up to 9 GSM and 3G neighbour cells during the reporting period. The neighbour cell listed in the screen are listed decending order of the Report That is, the neighbour cell with the highest RX Level is reported as Neighbour Cell 1
-
Enhanced Network Control Neighbour Reports Screen
, the screen is only populated with results when the Report Type is set to
Enhanced, the Mobile Station returns measurement reports on up to 16 GSM and 13 3G FDD neighbour cells during the reporting period. The neighbour cell information is displayed in the same order as specified in the neighbour cell lists of the test set, the Test set does not attempt to order the neighbour cell information the Mobile Station returns.
You can set the report type through configuration of the Report Type parameter. See
Configuring Measurement Report
. The type of report actually returned from the Mobile Station is displayed by the
Report Type
field on this screen.
| NOTE |
General Network Control Measurement Reports Screen
The following figure shows the General Network Control Measurement Reports screen. This screen displays Serving Cell Reports (which contain Network Control Mode, Rx Level, and I Level) and Neighbour Cell Reports (which contain the RAT, (U)ARFCN, NCC, BCC, SC (3G FDD), Report and Quantity of each neighbour cell). For General Network Control Measurement Reports, the Mobile Station returns information on up to 6 GSM or 3G FDD neighbour cells during the reporting period.
Enhanced Network Control Neighbour Reports Screen
The following figure shows the Enhanced Network Control Measurement Reports screen. This screen displays Reports for up to a maximum 29 valid neighbour cells (16 GSM and 13 3G FDD cells). The GSM neighbour cell report contains ARFCN, BCC, NCC, Rx Lev of each neighbour cell, the 3G FDD neighbour cell report contains UARFCN, SC, Report and Quantity of each neighbour cell.
Querying the Network Control Measurement Reports
You can obtain the Network Control Measurement Reports using the following queries:
Network Control :NEW? and [:LAST]? Queries
:NEW? queries hang until a new message is received by the test set or until the SCPI control device timeout occurs.
Measurements made during this period are averaged and the result of these averaged measurements are reported by the mobile station during the next period. Measurements must be stable in order to give valid (stable) results for a :NEW? query. Therefore, it may take up to three reports before a reported value accurately reflects a change to any of its parameters.
After changing measurement parameters, you must send three consecutive :NEW? queries to obtain stable, accurate results. By querying :NEW? three times the value becomes stable for the second query, and meaningful stable results are then reported for the third query. The results from the first two queries should not be used.
The :LAST? query is not a hanging query; values are returned from the last Network Control report. The :LAST? mnemonic is optional. If :NEW? is not used in the CALL:MS:REPorted:MEASurement:NCONtrol command, the :LAST value is automatically reported.
The mobile station only sends network controlled measurement reports if it is GPRS attached to the 8960, and when the Network Control Mode is set to 1 or 2.
Configuring Measurement Report
There are two types of configurable measurement report parameters:
- General Measurement Report Parameters, see Configuring General Measurement Reports Parameters for more details.
- 3G Measurement Report Parameters, see Configuring 3G Measurement Reports Parameters for more details.