TIA TSB-902.BAAA:2005 (R2013)

The Wideband Air Interface (WAI) Overview provides a general
definition and description of the wideband system's air interface
design and protocol architecture. This document defines the
allocation of the general functions to each protocol layer, and
provides a conceptual model for the WAI protocol stack and
primitive interfaces. A general description of how the WAI is
utilized to convey packets of information is also included to aid
the reader in comprehension of the detailed protocol layer
documents. Detailed technical information is contained in the rest
of the WAI protocol documents that comprise the wideband data
standards suite.

The general form of the WAI protocol stack is illustrated in
Figure 1 below "WAI Communications Stack Model". This document is
concerned with the interface between the MR and BR labeled Uw that
is shaded gray in the figure. The reader is advised that reference
[1] contains all of the WAI reference and protocol models.

The TIA-902 WAI series defines two standard wideband modulation
and radio channel coding technologies, along with a common set of
higher layer protocols. The relationship and TIA standards
designations are shown in Figure 2 below.

In this document and other TIA-902 standards there exists two
categories of system configurations; Direct and FNE Configurations.
The Direct configuration is supported between two subscriber radios
without the need for any fixed network equipment (FNE) components.
There are three specific configurations that are generally grouped
into the term "FNE Configurations".

• Radio to FNE

• Radio to Repeater to Radio

• Radio to Vehicular Repeater to FNE