Last updated: 2010-03-10
HSDPA Block Error Ratio Measurement Description
HSDPA Block Error Ratio Measurement Parameters
HSDPA Block Error Ratio Measurement Results
How Do I Make an HSDPA Block Error Ratio Measurement
The HSDPA block error ratio (BLER) measurement can only be performed on a Radio Bearer Test Mode connection with a Channel Type of 12.2k RMC + HSDPA. To perform the HSDPA BLER measurement, the test set sends blocks of data to the UE on the downlink HS-PDSCH(s), and then monitors the positive acknowledgments (ACKs) and negative acknowledgments (NACKs) sent by the UE on the uplink HS-DPCCH.
The UE is required to respond to every block of data directed to it with either an ACK or NACK. If it does not respond to a block in its assigned TTI, the test set logs the event as a statistical DTX (statDTX). Also, if the UE responds to a block with data other than all 1s (ACK) or all 0s (NACK), the TTI is treated as a statDTX. StatDTXs are considered block errors, and are included in the BLER calculation. You can specify how the test set responds to statDTXs using the statDTX Reception Behavior setting.
Number of blocks to test
GPIB Command: SETup:THBLerror:COUNt
Trigger Arm - see Trigger Arm.
Measurement Timeout
See Measurement Timeout. Ensure that the Measurement Timeout is greater than the time the measurement needs to measure the desired Number of Blocks to Test .
Block Error Ratio
3GPP TS 34.121 F.6.3.2 defines the HSDPA block error ratio as: (NACK + statDTX)/(NACK+ statDTX +ACK).
GPIB Command:FETCh:THBLerror:RATio?
Information Bit Throughput (kbps)
This result reports the data throughput of the HSDPA connection. 3GPP TS 34.121 F.6.3.1 defines Information Bit Throughput R as "the sum (in kilobits) of the information bit payloads (excluding the 24-bit HS-DSCH CRC) successfully received during the test interval, divided by the duration of the test interval (in seconds)."
GPIB Command: FETCh:THBLerror:IBTHroughput?
ACKs
Number of positive acknowledgments received. GPIB Command: FETCh:THBLerror:ACK?
NACKs
Number of negative acknowledgments received. GPIB Command: FETCh:THBLerror:NACK?
statDTXs
Number of statistical DTXs received. GPIB Command: FETCh:THBLerror:SDTX?
P(Em)
3GPP TS 34.122 defines P(Em) as the probability of event Em, which is declared when the UE is signaled on HS-SCCH, but DTX is observed in the corresponding HS-SICH ACK/NACK field. P(Em) is calculated by: (statDTX)/(NACK+ statDTX +ACK). This result is used for HS-SCCH Detection Performance testing.
GPIB Command: FETCh:THBLerror:PEM?
Blocks Tested
Blocks tested is the number of blocks that were tested in determining the Block Error Ratio, Information Bit Throughput , ACKs , NACKs , statDTXs. GPIB Command: FETCh:THBLerror:BLOCks?
3GPP TS34.122 9.3.1 HS-DSCH throughput for Fixed Reference Channels
3GPP TS34.122 9.3.2 HS-DSCH throughput for Variable Reference Channels
The following procedure performs the 3GPP TS34.122 9.3.1E HS-DSCH throughput for Fixed Reference Channels 2.8 Mbps UE class QPSK/16QAM, Test 1, as an example.
Connect the UE to the front panel RF IN/OUT port (For TS34.122 9.3.1E, the standard also requires the multipath fading simulator and external AWGN, please ensure all your hardware connections are correct).
Configure your UE to be of 2.8 Mbps UE class.
Set call parameters as following:
[F7 in Call Parms 1 of 3] Set the Cell Power to the appropriate value for your test.
[F8 in Call Parms 1 of 3] Set Channel Type to 12.2k RMC + HSDPA.
[F11 in Call Parms 1 of 3] Select HSDPA RB Test Mode Setup (F7)
Set the HS-DSCH Config to RMC (default).See HSDPA Channel Configuration-RMC and VRC for the downlink and uplink channel configurations.
Set the RMC Type to 2.8M QPSK.
Select MAC-hs Parameters (F8), set the Number of transmissions to 4 (default) and RV Sequence to 0,0.0,0.0,0.0,0 (simply enter 0 and press the knob). Leave the other MAC-hs parameters as default.
[F1 in Call Control 2 of 3] Set the Scrambling Code to 1.
[F2 in Call Control 2 of 3] In Cell Parameters, set the PS Domain Information to Present.
Power the UE on and wait for it to be registered.
[F3 in Call Control 1 of 3] Press Originate Call. Wait for the Active Cell area to be Connected.
Press the Measurement selection key.
Select HSDPA Block Error Ratio.
(Optional) [F1 in Control 1 of 2] Setup the HSDPA Block Error Ratio measurement parameters.
Watch the Information Bit Throuput result.
The following procedure performs the 3GPP TS34.122 9.3.2E HS-DSCH throughput for Variable Reference Channels 2.8 Mbps UE class, Test 1, as an example.
Connect the UE to the front panel RF IN/OUT port (For TS34.122 9.3.2E, the standard also requires the multipath fading simulator and external AWGN, please ensure all your hardware connections are correct).
Configure your UE to be of 2.8 Mbps UE class.
Set call parameters as following:
[F7 in Call Parms 1 of 3] Set the Cell Power to the appropriate value for your test.
[F8 in Call Parms 1 of 3] Set Channel Type to 12.2k RMC + HSDPA.
[F11 in Call Parms 1 of 3] Select HSDPA RB Test Mode Setup (F7)
Set the HS-DSCH Config to VRC. See HSDPA Channel Configuration-RMC and VRC for the downlink and uplink channel configurations.
Select MAC-hs Parameters (F8), set the Number of transmissions to 1 and RV Sequence to 0,0.0,0.0,0.0,0 (simply enter 0 and press the knob). Leave the other MAC-hs parameters as default.
[F1 in Call Control 2 of 3] Set the Scrambling Code to 1.
[F2 in Call Control 2 of 3] In Cell Parameters, set the PS Domain Information to Present.
Power the UE on and wait for it to be registered.
[F3 in Call Control 1 of 3] Press Originate Call. Wait for the Active Cell area to be Connected.
Press the Measurement selection key.
Select HSDPA Block Error Ratio.
(Optional) [F1 in Control 1 of 2] Setup the HSDPA Block Error Ratio measurement parameters.
Watch the Information Bit Throuput result.
The following procedure performs the 3GPP TS34.122 9.3.4 HS-SCCH Detection Performance, Test 1, as an example.
Connect the UE to the front panel RF IN/OUT port (For TS34.122 9.3.4, the standard also requires the multipath fading simulator and external AWGN, please ensure all your hardware connections are correct).
Set call parameters as following:
[F7 in Call Parms 1 of 3] Set the Cell Power to the appropriate value for your test.
[F8 in Call Parms 1 of 3] Set Channel Type to 12.2k RMC + HSDPA.
[F11 in Call Parms 1 of 3] Select HSDPA RB Test Mode Setup (F7)
Set the HS-DSCH Config to HSSCCH Detection. See HSDPA Channel Configuration-HS-SCCH Detection for the downlink and uplink channel configurations.
Leave the H-RNTI Parameters as default. The default values for Primary H-RNTI and HS-SCCH2-4 H-RNTIs are set to match the standard.
[F1 in Call Control 2 of 3] Set the Scrambling Code to 0 (default).
[F2 in Call Control 2 of 3] In Cell Parameters, set the PS Domain Information to Present.
Power the UE on and wait for it to be registered.
[F3 in Call Control 1 of 3] Press Originate Call. Wait for the Active Cell area to be Connected.
Press the Measurement selection key.
Select HSDPA Block Error Ratio.
(Optional) [F1 in Control 1 of 2] Setup the HSDPA Block Error Ratio measurement parameters.
Watch the P(Em) result.
GPIB Commands: SETup:THBLerror, FETCh:THBLerror