User's Manual Chapter 13

Base FCC Regulatory Test Report
7-84
AT&T Wireless Services
FCC Type Acceptance Application
10991 Rev. 1.0 7/6/99
Table 7.1— outlines the major interfaces within the PWAN architecture
shown in Figure 7.1—.
7.1.3 Wireless Network Element Deployment
The PWAN service area is comprised of a number of small service
regions or cells. Each cell consists of one Base and a number of RUs.
PWAN cells are typically smaller than those of a mobility network. In a
typical PWAN system, the link budget dictates a cell radius of between
100 m and 1.6 km, corresponding to a path loss range of 70 to 140 dB.
To provide sufficient traffic resources for the RU population
surrounding a Base, cells may be split into two, three, or four sectors. A
typical PWAN cell site will employ a four-sector Base and associated
antennas designed to provide coverage over a 90-degree horizontal
beamwidth within each sector. The number and type of Base antennas
will vary depending upon site requirements, and either spatial or
polarization diversity antenna configurations may be employed. Each
sector of the Base requires access to 1 MHz of downlink and 1 MHz of
uplink bandwidth.
Within PWAN systems that support four-sector cells, the frequency
reuse between adjacent cells will be one. This reuse factor is possible
by virtue of the unique nature of the interference environment and the
control that the Base maintains through the RU channel allocation
process.
Unlike cellular communications systems designed for a mobility
environment, the PWAN has an advantage of supplying service to fixed
Table 7.1— PWAN Reference Architecture – Interface Definitions
Interface ID Description
T Interface Terminal interface to RUs
A Interface Air interface between RUs and Base radio equipment
P Interface Interface between Base radio equipment and Base
control
Csw Interface Interface that provides public switched telephone
network (PSTN) connectivity for call processing
M Interface Management interface between WEMS and Base agent
O Interface Operations interface between WEMS and WNMS
SL Interface Operations interface between WNMS and WSMS