The lab application includes two sectors, cell 1 and cell 2. Cell 1 is a full sector, supporting all call processing functionality available in the test set. Cell 2 is provided to allow the test set to perform a soft handover. Cell 2 alone can not be used for call processing events, such as establishing a call or handing off to a new frequency. Cell 2 can only be used in conjunction with cell 1 to test the UE's soft handover capability. The table below summarizes the features of cell 1 and cell 2, and indicates if the features are user-settable.
|Feature||Cell 1||Cell 2|
|DL Channel||User-settable (see Downlink Channel (UARFCN) )||Equals cell 1 setting|
|Level||User-settable||User-settable (see CALL:CELL2:CPIChannel ).|
|P-CCPCH/SCH||Level||User-settable||User-settable (see CALL:CELL2:CCPChannel ).|
|S-CCPCH||Channelization Code||User-settable||No S-CCPCH|
|PICH||Channelization Code||User-settable||No PICH|
|AICH||Channelization Code||User-settable||No AICH|
|Channelization Code||User-settable||Equals cell 1 setting|
|Level||User-settable||User-settable (see CALL:CELL2:DPCHannel ).|
|Composite OCNS||16 channels (see Orthogonal Channel Noise Simulator (OCNS) )||1 channel at OVSF [128,2] (see CALL:CELL2:OCNSource )|
|Primary Scrambling Code||User-settable||User-settable (see CALL:CELL2:SCODe ).|
|Cell Power||User-settable||User-settable. Cell 2 power must be within 10 dB of cell 1 power. Cell 2 is turned off if cell 1 is turned off. (see CALL:CELL2:POWer )|
|Closed Loop Power Control||User-settable: All Up, All Down, Alternating, 10 Up/10 Down, Active, Single Up, Single Down (see Uplink Closed Loop Power Control Parameters and UE Target Power ).||User-settable: All Up, All Down, Alternating, 10 Up/10 Down, Active. When set to "Active," the TPC bits transmitted are the same as those transmitted by cell 1 (see Cell 2 UL CL Power Ctrl Mode and CALL:CELL2:CLPControl ).|
|Cell 2 Time Offset||You can specify a time offset which offsets the cell 2 signal in time relative to the cell 1 signal (see How Do I Configure Cell 2? and CALL:CELL2:TOFFset ). The test set can then order the UE to measure and report the SFN-SFN Observed Time Difference (OTD) .|
See How Do I Configure Cell 2? for more information about configuring cell 2 from the front panel. See Downlink Channel Codes and Levels for more information about cell 1 channelization codes and levels.
The test set's total RF output power is a combination of the power of cell 1, cell 2 and AWGN power:
Total RF Power (dBm/3.84 MHz) = [Cell 1 Power + Cell 2 Power + AWGN Power] (dBm/3.84 MHz)
(see Cell Power and AWGN Power for more information about cell power and AWGN power).
Total RF Power
Cell 1 CPICH Power(Cell Power + CPICH Level (or Cell 1 Connected CPICH Level))
Cell 2 CPICH Power(Cell 2 Power + Cell 2 CPICH Level)
Delta Power(the difference between the CPICH and Total RF Power)
Primary Scrambling Code
When a non-HSDPA connection is established between the test set and UE, you may request measurement results from the UE, including
Cell 1/Cell 2 UE Reported Measurements
). When you request UE reported measurement results, results for CPICH RSCP, CPICH Ec/No and Pathloss are returned for both cell 1 and cell 2 (if cell 2 is set to a non-zero power level). If you have enabled soft handover (see
Enabling Soft Handover
), the DTCH BLER Report result includes both cell 1 and cell 2 (there is only one DTCH in soft handover because soft combining of the two radio links in the UE occurs before the point where the DTCH is extracted and BLER is calculated).
After establishing a non-HSDPA call between the test set's cell 1 and the UE, and configuring cell 2 (power, primary scrambling code, time offset, etc., see Cell 2 Overview ), you may turn soft handover on (see How Do I Perform a Soft Handover? and CALL:SHANdoff:ENABle ). This orders the UE to try to demodulate the signal from cell 2. Soft handover is not supported while on a CELL_FACH connection (see RB Test Mode RRC State Setting ) or while on an HSDPA connection.
Soft handover is supported for HSUPA connections but only to simulate a network scenario for when a UE performs a soft handover with cell 2 but the HSUPA channels remain confined to the cell 1 (serving cell). When an HSUPA call is established between the test set's cell 1 and the UE and you turn soft handover on, the DPCH is instructed to soft handover to cell 2 while the HSUPA channels remain confined to cell 1.
If the soft handover was successful (the UE responded correctly to the Active Set Update procedure), then a status of
is displayed for
Soft Handover State
You can test Loopback BER and BLER while in soft handover (see How Do I Perform a Soft Handover? , Loopback Bit Error Ratio (BER) Measurement Description and Block Error Ratio (BLER) Measurement Description ). When soft handover is not enabled, as you increase cell 2 power, you will see an increase in BER/BLER (because cell 2 acts as an interferer). When you enable soft handover, the BER/BLER result should improve, as the UE is then able to soft combine the signals from both cells. (If cell 2 level is too high, the messaging to order a soft handover may not be properly received by the UE and an error will be posted. If this is the case, simply decrease cell 2 power, enable soft handover, then return cell 2 to its previous level).
The soft handover functionality present in the test set also allows you to enable/disable event reporting (by turning
on and off), and to configure event parameters (such as
Event 1a State
When event reporting is enabled (non-HSDPA connections only), the UE reports to the test set when an event occurs (if you have enabled that event by turning its state on. For example: if you have set
Event 1a State
, then the UE will report when a 1a event occurs). You can query the most recent event reported by the UE using the
query, and which cell caused the event using the
Send Event Config( F5 when viewing the
SHO/Event Parametersmenu with
Event Stateon) or by toggling
Event Stateoff and on.
The Measurement Control message sent by the test set orders the UE to use the RSCP measurement result to determine whether an event has occurred. When an event occurs, the UE reports the requested MS reported measurement results - CPICH Ec/No, CPICH RSCP, Pathloss and/or DTCH BLER Report (see Mobile Station Reported Pilot Information ).
Manual Operation: How Do I Configure Cell 2?
Manual Operation: How Do I Configure and Enable (Start) Event Reporting?
Manual Operation: How Do I Perform a Soft Handover?