User`s guide

174 E6651A User’s Guide
A Appendix A - Network Entry Procedure
Network Entry Procedure Detail
The Test Set engages in the Network Entry procedure when
establishing two way communications with the SS. The
messages transmitted during the each phase of the Network
Entry procedure are displayed in the Measurement Window
when the Test Set is operating in BSE mode. The following
sections describe the detailed steps in the procedure, and
show the operation of the Test Set for each step.
Downlink Synchronization and Uplink Parameter Information
In the Downlink Synchronization procedure, the BS
transmits an OFDMA frame to the SS containing the
DL- MAP information. The SS uses the DL- MAP information
to obtain UL- MAP, DCD and UCD information. The OFDMA
frame structure, including the mapping of each information
type, is shown in Figure 45.
Figure 45 OFDMA Frame Structure
The Test Set periodically broadcasts DCD and UCD
information to the SS to provide downlink synchronization
and uplink parameter information at the designated
FCH
DL-MAP Preamble
UL-MAP
Burst#0
Burst#1
Burst#2
Burst#3
Downlink Uplink
Burst#0
Burst#1
Burst#2
5ms
Initial Ranging Region
DCD, UCD Info
Periodic/BW Req. Ranging Region