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8960 W-CDMA/HSPA Online User's Guide
E1963A, E6703E
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HSDPA Parameters

Last updated: March 16, 2009

This section is only applicable to the lab application or feature-licensed test application.

UE Category Parameters

The UE category currently in use by the test set is reported by the Current UE HS-DSCH Category result.

MAC-hs Parameters

The test set schedules new blocks and retransmissions based on the acknowledge/negative acknowledge (ACK/NACK) information on the uplink HS-DPCCH. If a NACK is received and the block has not been transmitted more than the Number of Transmissions setting allows (and if the TSN to be transmitted is within the transmit window, see MAC-hs Window Size ), the HARQ process retransmits the block using the next redundancy version (RV) from the RV Sequence list. If a NACK is received and the block has been retransmitted the maximum number of allowed times (or if the TSN lies outside the transmit window), or if an ACK is received, the MAC-hs layer transmits a new block using the first RV in the list. If the expected HS-DPCCH transmission is not received on the uplink at the appropriate time, the test set reacts according to the statDTX Reception Behavior setting. The test set records the number of ACKs, NACKs, and statDTXs and displays them in the HSDPA Information window and reports them to the HSDPA BLER measurement (see HSDPA Block Error Ratio Measurement Description ).

  • Number of Transmissions

    The number of times a MAC-hs HARQ process will attempt to transmit a particular data block (one to eight).

    GPIB command: CALL:HSDPa:MACHs:NTRans

  • RV Sequence

    As described in 3GPP TS 25.212, the RV parameter controls exactly which bits are transmitted to the UE (i.e. the systematic bits versus the convolutionally coded bits) and for 16QAM modulation, which symbols are mapped to which modulation points. By selecting a different RV each time a block is retransmitted, the network increases the chance that the turbo decoder in the UE will be able to recover the original block. Alternatively, the network can use the same RV for each retransmission and the UE uses chase combining on the received bits to increase the likelihood of receiving the block correctly.

    The RV Sequence setting indicates the sequence of RV parameters to be used by the test set for block transmissions. You may specify up to eight integer values (between zero and seven), but the number of RV parameters actually used by the test set is determined by the Number of Transmissions setting (the RV parameters at the end of the sequence are not used if the Number of Transmissions setting is less than the number of RV parameters in the sequence). If you enter fewer than eight values for the RV sequence, the test set fills the remaining values with zeroes. The default RV sequence matches 3GPP TS 34.121 s9.2.1.

    GPIB command: CALL:HSDPa:MACHs:RVSequence

  • MAC-hs Window Size

    MAC-hs Window Size can be set to 4, 6, 8, 12, 16, 24, or 32. In accordance with 3GPP TS 25.321 11.6.2.3.2, the test set will not retransmit a block with a TSN that is outside the transmit window. This parameter sets both the MAC-hs transmit and receive window sizes.

    GPIB command: CALL:HSDPa:MPOWer:OFFSet:MANual

    This parameter can only be set when the data/call status is Idle .

  • MAC-hs T1

    This parameter controls the value of the MAC-hs T1 timer that is signaled to the UE in the Radio Bearer Setup message. 3GPP TS 25.331 s10.3.5.1a defines T1 as "Timer (in milliseconds) when PDUs are released to the upper layers even though there are outstanding PDUs with lower TSN values."

    The behavior of T1 (the "re-ordering release timer") is defined in 3GPP TS 25.321 s11.6.2.3.

    GPIB command: CALL:HSDPa:MACHs:T1

    This parameter can only be set when the data/call status is Idle .

  • statDTX Reception Behavior

    You can configure how the test set responds to a statDTX from the UE (the options are as defined in 3GPP TS 34.121 Table 9.2.1.2).

    • Handle as ACK

      When statDTX Reception Behavior is set to Handle as ACK , when a statDTX occurs, the test set transmits a new block from the MAC-hs transmit queue using the first entry in the RV Sequence and resets the transmission counter to one.

      Note, if you would like the test set to continuously transmit a stream of new (PRBS) data regardless of the uplink HS-DPCCH presence (to allow you to measure BER in an external program, for example), set statDTX Reception Behavior to Handle as ACK , set Number of Transmissions to 1 , FDD Test "HS-DSCH Data Pattern" to CCITT PRBS15 or CCITT PRBS9 , and MAC-hs Header to Data .

    • Handle as NACK

      When statDTX Reception Behavior is set to Handle as NACK , when a statDTX occurs, if the transmission counter is less than the Number of Transmissions setting, the test set transmits the same block using the next entry in the RV Sequence and increments the transmission counter by one. If the transmission counter equals the Number of Transmissions setting, then the Handle as ACK process is followed instead.

    • Handle as statDTX

      When statDTX Reception Behavior is set to Handle as statDTX , when a statDTX occurs, the test set transmits the same block using the same entry in the RV Sequence and does not increment the transmission counter.

      Note that when statDTX Reception Behavior is set to Handle as statDTX , if the UE never transmits an ACK or NACK, the test set will continuously transmit the same block (even if you change HS-DSCH Data Pattern ).

    GPIB command: CALL:HSDPa:MACHs:SDTX:RBEHavior

MAC-ehs Parameters

  • MAC-ehs Segmentation Strategy

    This setting specifies the segmentation strategy at the MAC-ehs layer in Active Cell mode.

    The following settings are available:

    • Standard : Segmentation at the MAC-ehs layer is done as required to fit as many re-ordering SDUs as possible into the MAC-ehs PDU.
    • Minimum : Segmentation at the MAC-ehs is avoided as much as possible. The test set fits as many re-ordering SDUs as possible into the MAC-ehs PDU. Each of the SDUs contains only a single complete MAC-d PDU. However, if the MAC-ehs PDU size is smaller than the MAC-d PDU size, segmentation is performed.

    This parameter can only be set when call status is Idle .

    GPIB Command: CALL:HSDPa:MACEHS:SEGMentation

Measurement Power Offset

  • Meas Pow Offset

    This setting is the difference in power levels of the CPICH and HS-PDSCH channels. The UE assumes this value to be the power level that the test set uses when transmitting the HS-PDSCHs, and therefore uses this parameter in its HSDPA CQI measurement algorithm.

    The Meas Power Offset ,Gamma (defined in 3GPP TS 25.214 s6A.2), that is used by the UE is signaled at call setup and remains unchanged unless a Transport Channel Reconfiguration procedure is performed.

    The parameters that are used to calculate the Meas Power Offset if its control state is set to Auto depend on the service type (see Current Service Type ).

    • If the service type is either Radio Bearer Test Mode - HSDPA or Packet Switched Data - HSDPA, then the automatic value for the Meas Power Offset is the difference of HSDPA Cell 1 Connected HS-PDSCHs Level (Sum) minus HSDPA Cell 1 Connected CPICH Level . Note: If either of the two parameters used in the calculation of the Meas Power Offset is set to Off , then the test set uses a value of -20 dB for the corresponding parameter.

    • If the service type is either Radio Bearer Test Mode - HSPA or Packet Switched Data - HSPA, then the automatic value for the Meas Power Offset is the difference of HSPA Cell 1 Connected HS-PDSCHs Level (Sum) minus HSPA Cell 1 Connected CPICH Level . Note: If either of the two parameters used in the calculation of the Meas Power Offset is set to Off , then the test set uses a value of -20 dB for the corresponding parameter.

    GPIB Command: CALL:HSDPa:MPOWer[:MOFFset]

    This parameter can only be set while the call status is Idle .

    This setting is only available in the lab application. (In the test application the measurement power offset is set to -6 dB.)

H-RNTI Parameters

  • Primary H-RNTI (Hex)

    Identifier used by the test set to transmit to the UE under test. The test set only transmits to the UE under test on HS-SCCH 1.

    GPIB command: CALL:HSDPa:HRNTi[:PRIMary]

    This parameter can only be set when call status is Idle .

  • Alternate H-RNTI (Hex)

    During TTIs where data is not transmitted to the UE under test (when inter-TTI is greater than one), the test set transmits dummy data on HS-SCCH 1 using the Alternate H-RNTI. The content of the HS-SCCH 1 when the Alternative H-RNTI is in use is the same as the data that was used the last time the Primary H-RNTI (Hex) was used.

    HS-SCCH 2-4, when turned on, are always transmitted using the Alternate H-RNTI . The content of HS-SCCH 2-4 is fixed as follows:

    • Code set: 0b1101110
    • Modulation scheme: 0b0
    • Transport block size: 0b010010
    • HARQ process information: 0b101
    • RV information: 0b111
    • New data: 0b0

    When not transmitting data to the UE under test, the test set sends a fixed pattern of uncoded PRBS data on the HS-PDSCHs. The number of HS-PDSCHs transmitted is the same as the number of HS-PDSCHs transmitted during the last subframe that contained data directed to the UE under test.

    GPIB command: CALL:HSDPa:HRNTi:ALTernate

    This parameter can only be set when call status is Idle .

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