|R-Data Packet Size (bits)||Modulation Format||Effective Data Rate (kbps)|
After 2 subpackets
After 3 Subpackets
After 4 subpackets
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 .
The name of the modulation is derived from the modulation type and the Walsh code length (as shown in the following table).
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 .
In Subtype 2 and Subtype 3 physical layer operation, the R-Data channel uses a new timing structure. The frame and slot timing is the same as Subtype 0 physical layer (each 26.67 ms frame consists of 16, 1.667 ms slots), but the concepts of the sub-frame is introduced. Each Sub-frame consists of four contiguous slots (6.667 ms). Also new is the concept of a subpacket. A subpacket is defined to be the smallest unit of a R-TCH transmission that can be acknowledged at the physical layer by the AN. A subpacket is transmitted over four contiguous slots, thus a subpacket is transmitted in one sub-frame. Each physical layer packet can be transmitted in up to four subpackets. When more than one subpackets are required to successfully transmit the physical layer packet, the transmitted subpackets use a three sub-frame interlace pattern. This means that following the transmission of a subpacket, another subpacket belonging to the same physical layer packet cannot be transmitted until the third sub-frame after the previous subpacket is transmitted. The Subtype 2/Subtype 3 R-Data channel also uses five modulation schemes as opposed to the single scheme used in Subtype 0 operation.
GPIB Command: CALL[:CELL]:APPLication:DATA[:REVerse]:PACKet[:SIZE]
Manual Operation: How Do I Change Call Parameters?