R-Data Pkt Size

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

R-Data Packet Size, Modulation and Effective Data Rate (for Subtype 2 and Subtype 3 Physical Layer)

Payload Size Index

R-Data Packet Size (bits) Modulation Format Effective Data Rate (kbps)

After 1 subpacket
(4 slots)

After 2 subpackets
(8 slots)
After 3 Subpackets
(12 slots)
After 4 subpackets
(16 slots)

1

128 B4 19.2 9.6 6.4 4.8

2

256 B4 38.4 19.2 12.8 9.6

3

512 B4 76.8 38.4 25.6 19.2

4

768 B4 115.2 57.6 38.4 28.8

5

1024 B4 153.6 76.8 51.2 38.4

6

1536 Q4 230.4 115.2 76.8 57.6

7

2048 Q4 307.2 153.6 102.4 76.8

8

3072 Q2 460.8 230.4 153.6 115.2

9

4096 Q2 614.4 307.2 204.8 153.6

10

6144 Q4Q2 921.6 460.8 307.2 230.4

11

8192 Q4Q2 1228.8 614.4 409.6 307.2

12

12288 E4E2 1843.2 921.6 614.4 460.8

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

Background Information (Subpacket)

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.

Related Topics


GPIB Command: CALL[:CELL]:APPLication:DATA[:REVerse]:PACKet[:SIZE]

Manual Operation: How Do I Change Call Parameters?

Enhanced Test Application Protocol

Multi-carrier Test Application Protocol

Release A Physical Layer Subtype

Release B Physical Layer Subtype

RTAP Rate