R-Data Pkt Size

Last updated: July 23, 2008

This section is only applicable to the lab application and to a test application with the required feature license.

R-Data Pkt Size is used to set the reverse traffic packet size (as well as the data rate and modulation) when the following conditions are met:

• the test set is in Active Cell operating mode with an RETAP data connection established for physical layer subtype 2. It is sent to the AT in the RETAP Parameter Assignment Message with the PacketPayloadSizeMode attribute set to the associated data packet size (see Enhanced Test Application Protocol ).
• the test set is in Active Cell operating mode with an RMCTAP data connection established for physical layer subtype 3. It is sent to the AT in the RMCTAP Parameter Assignment Message with the PacketPayloadSizeModeMC attribute set to the associated data packet size (see Multi-carrier Test Application Protocol ).

• the test set is in IS-856 Test operating mode with Protocol Rel set to the A (1xEV-DO-A) and Release A Physical Layer Subtype set to the subtype 2.

• the test set is in IS-856 Test operating mode with Protocol Rel set to the B (1xEV-DO-B) and Release B Physical Layer Subtype set to the subtype 2 or subtype 3.

The following table shows the associated data rate and modulation for each packet size.

• In Subtype 2 and Subtype 3 physical layer operation, each reverse physical layer packet can be transmitted in up to four subpackets (see Background Information (Subpacket) ). The effective data rate depends on how many subpackets are transmitted for each physical layer packet. The ACK/NAK sent on the forward ARQ channel determines how many subpackets are sent for each reverse physical layer packet. For details on when the test set sends an ACK on the forward ARQ channels, see R-Data Pkt Size .

  When a single data rate for the reverse traffic channel is referenced, it usually refers to the effective data rate after 1 subpacket.

• The name of the modulation is derived from the modulation type and the Walsh code length (as shown in the following table).

  • B4: indicating BPSK modulation with 4 bit walsh code for spreading, applied to Q channel.
  • Q4: indicating QPSK modulation with 4 bit walsh code for spreading, applied to both I and Q channels.
  • Q2: indicating QPSK modulation with 2 bit walsh code for spreading, applied to both I and Q channels.
  • Q4Q2: indicating QPSK modulation with both a 4 bit and a 2 bit walsh code for spreading, applied to both I and Q channels.
  • E4E2: indicating 8-PSK modulation with both a 4 bit and a 2 bit walsh code for spreading, applied to both I and Q channels.

    Subtype 2 and Subtype 3 R-Data Modulation Type vs. Walsh Code

    R-Data Packet Size (bits)	R-Data Modulation Type	Modulation Name	Spreading Factor	Walsh Code	Duty Cycle
    128, 256, 512, 768 or 1024	B4	BPSK	4	Q:2	Full slot
    1536 or 2048	Q4	QPSK	4	Q:2	Full slot
    			4	I:2	Full slot
    3072 or 4096	Q2	QPSK	2	Q:1	Full slot
    			2	I:1	Full slot
    6144 or 8192	Q4Q2	QPSK	4	Q:2	Full slot
    			4	I:2	Full slot
    			2	Q:1	Full slot
    			2	I:1	Full slot
    12288	E4E2	8-PSK	4	Q:2	Full slot
    			4	I:2	Full slot
    			2	Q:1	Full slot
    			2	I:1	Full slot

• The AT may support transmission of the reverse traffic channel at 1843.2 kbps (12288 bit packet size) according to the Rate1M8Supported attribute (1 = support, 0 = not support). See Rate 1M8 Supported Control .

R-Data Pkt Size can be changed at any time. If a connection is open, it will be maintained.