Release A Physical Layer Subtype

Release A Physical Layer Subtype

Last updated: July 23, 2008

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


In Active Cell operating mode and IS-856 Test operating mode, the Release A Physical Layer Subtype allows you to select the physical layer subtype protocol when the Protocol Rel is set to protocol release A (1xEV-DO-A) .

The protocol release A (1xEV-DO-A) supports both the new Subtype 2 physical layer and the original Subtype 0 physical layer as supported by the protocol release 0 (1xEV-DO). By default, the Release A Physical Layer Subtype is set to Subtype 2 physical layer for the protocol release A (1xEV-DO-A).

The Subtype 2 physical layer provides more functionality than the Subtype 0 physical layer. For details, see Key Enhancements in Subtype 2 Physical Layer Relative to Subtype 0 .

In Active Cell operating mode, the test set negotiates with the AT on the physical layer subtype during Session Negotiate State . As shown in the table below,

The current physical layer subtype that the test set is emulating is displayed at the bottom area of the front panel display and can be queried with CALL:STATus:PROTocol:PLAYer? .
Determination of Current Physical Layer Subtype
Protocol Release Connection State

Current Physical Layer Subtype

A (1xEV-DO-A) Idle State (session not open) Subtype 0
Session Open or Connected Depends on the setting of Release A Physical Layer Subtype
0 (1xEV-DO) Does not matter Subtype 0

The current physical layer subtype indirectly determines the associated application layer protocols and the MAC Layer protocols being configured in the test set, as shown below.

Current Physical Layer Subtype and Associated Protocols

Protocol Release

0 (1xEV-DO)

A (1xEV-DO-A)

Current Physical Layer Subtype

Subtype 0

Subtype 0

Subtype 2

Associated Physical Layer Protocol

Subtype 0 Physical Layer Protocol

Subtype 2 Physical Layer Protocol

Associated Application Protocol
Associated MAC Layer Protocols

Default Access Channel MAC

Default Control Channel MAC

Subtype 1 Reverse Traffic Channel MAC

Subtype 3 Reverse Traffic Channel MAC

Default Forward Traffic Channel MAC

Enhanced Forward Traffic Channel MAC

Key Enhancements in Subtype 2 Physical Layer Relative to Subtype 0

Forward Link

The Subtype 2 forward link physical layer has several modifications relative to the Subtype 0 physical layer:

  • Supporting variable and short physical layer packet size for the forward link at a given data rate (DRC value). Moreover, the forward link data rate can be from 4.8 kbps to 3072 kbps (Subtype 0: 38.4 kbps to 2457.6 kbps). See F-Traffic Format for details.
  • Supporting new forward ARQ channels (H-ARQ, L-ARQ and P-ARQ) used to acknowledge each received subpackets on the reverse traffic channel. For details, see Forward Channel Overview .
  • Supporting one-to-one correspondence with the MAC layer packet size and the physical layer packet size (in Subtype 0 physical layer, the MAC packet size is always fixed to 1024 bits and multiple MAC packets are required to fill up the large physical layer packets).
  • More available MAC indices (128 versus 64 in Subtype 0 Physical Layer). See MAC Index for details.

Reverse Link

The Subtype 2 reverse link physical layer is quite different from that of Subtype 0 physical layer:

  • Subtype 2 reverse traffic channel introduces two new channels (Auxiliary Pilot and DSC) in addition to the design changes of the existing subtype 0 channels (R-Pilot, RRI, R-ACK, and R-Data). For details, see Reverse Channel Overview .
  • Subtype 2 reverse data channel supports data rates from 4.8 kbps up to 1843.2 kbps (Subtype 0: 9.6 kbps to 153.6 kbps) and also uses five modulation schemes as opposed to the single scheme (BPSK) used in subtype 0 operation. See R-Data Pkt Size .
  • Subtype 2 reverse access channel supports data rates of 9.6 kbps, 19.2 kbps, and 38.4 kbps (Subtype 0: 9.6 kbps only). See Enhanced Access Rate .

Operating Considerations

Related Topics


Manual Operation:

Access Channel MAC Subtype

Protocol Rel

Test Application Protocol

Enhanced Test Application Protocol

Multi-carrier Test Application Protocol