Packet Switched Data

HSDPA Packet Switched Data

The test set supports an HSDPA packet data connection as defined by 3GPP TS 34.108 6.10.2.4.5.1 (see GPRS Radio Access Bearer ). You must specify some aspects of the channel configuration by providing the UE category to the test set (see Current UE HS-DSCH Category , but note that the HSDPA packet data service in the test set only supports UE categories 1-6, 11 and 12) and by specifying a PS Data Configuration Type .

Based on the Current UE HS-DSCH Category , the test set sets the number of HARQ processes to the value in 3GPP TS 34.108 s6.10.2.4.5.1.2.2.2 (for example, number of HARQ processes is set to 6 for a category 12 UE).

Based on the Current UE HS-DSCH Category , the test set sets the inter-TTI interval to the "Minimum inter-TTI interval" value in 3GPP TS 25.306 Table 5.1a (for example, inter-TTI interval is set to 1 for a category 12 UE).

Based on the PS Data Configuration Type setting, the test set sets the transport block size, number of HS-PDSCHs, modulation type and IR buffer size (N _IR ) to the values in 3GPP TS 25.214 s6A.2 Tables 7A-E (depending upon the Current UE HS-DSCH Category ).

HSPA Packet Switched Data

This section is only applicable to the lab application.

The test set supports an HSPA channel configuration for packet data connections that is combined with HSDPA as defined by 3GPP TS 34.108 6.10.2.4.6.1 (see GPRS Radio Access Bearer ). The HSUPA packet data service in the test set supports a 10 ms E-DCH TTI or 2 ms E-DCH TTI (see HSUPA TTI ). The test set also requires that the UE use no more than two E-DPDCHs with a minimum spreading factor of SF2. The actual number of E-DPDCHs and the spreading factor the UE uses are dependent on the PS Data E-DPDCH Max Channel Codes setting, the amount of data waiting to be transmitted, the UE's serving grant, the UE's E-DCH capability and the power the UE has available.

The following table lists the maximum block size and corresponding uplink data rate for each E-DCH UE category.

The HSUPA packet data service in the test set only fully supports data rates on the HSDPA channel up to 3.6 Mbps (category 7 and 8 UE's can still establish a PDP context, however data rates above 3.6 Mbps are not guaranteed).

The HSUPA packet data service in the test set only supports scheduled grants. During call setup the UE is given an absolute grant. Once on the call the UE's Serving Grant can be modified either by transmitting a new absolute grant or by sending up or down relative grant command. If the test set does not send a specific Up/Down command request, it sends a hold on the E-RGCH. Note that the HSPA Cell 1 Connected E-RGCH Level must be set to On (by default it is set to Off) in order for the UE to hear the relative grant commands.

During call setup, the UE is given a minimum E-TFCI set. This setting is effectively a minimum serving grant that is available even if the actual serving grant is reduce below the value by commands sent on the E-AGCH or the E-RGCH. Also during call setup, the UE is instructed to use a HARQ RV Configuration = rv0 (that is, chase combining), however the test set only perform demodulation and decoding on the most recently received E-DPDCH frame (and therefore it does not actual perform chase combining).

If the E-HICH Behavior is set to Active, the test set transmits Ack/Nack responses on the E-HICH based on whether the E-DPDCH passed its CRC check or not. If the UE did not transmit on the E-DPDCH then the Alternate E-HICH Signature is used on the E-HICH to simulate a DTX.

Scheduling information sent by the UE in the MAC-e PDUs can be viewed in the contents of the MAC-e/es layer messages which can be captured by using the Wireless Protocol Advisor (WPA). By default the scheduling information is off. To turn scheduling information on, see Scheduling Information Periodicity (No Grant) and Scheduling Information Periodicity (Grant) .

The MAC-e/es PDUs are logged as a single PDU that has both MAC-e and MAC-es fields decoded. In addition to the MAC-e/es PDU contents, WPA logs all the information contained in the header of the MAC0e/es PDU. All E-DCH data is logged including blocks that fail their CRC check. Note that if a MAC-e/es block is marked as failing its CRC check, it could either be due to a bit error in the information itself, or because of a bit error on the E-DPCCH and thus the L1 header information (number of HARQ processes, E-DCH block size, RSN, Happy Bit, number of channels and spreading factor, E-AGCH and E-RGCH) logged for each MAC-e/es frame might not match what the UE attempted to transmit.

Packet Data Setup

Related Topics

HSDPA PS Data Setup

HSUPA PS Data Setup

GPRS Packet Data Service Ladder Diagrams

How Do I Configure the Data Channel?