User`s guide

182 E6651A User’s Guide
A Appendix A - Network Entry Procedure
Periodic Ranging for Connection Maintenance
After the Network Entry procedure has been completed, the
SS engages in the Periodic Ranging procedure to assist in
maintaining a reliable connection with the network.
The Periodic Ranging Procedure as seen in the Measurement
Window of the E6651A is shown in Figure 49.
Figure 49 Periodic Ranging Procedure
The message used in the Periodic Ranging Procedure of
Figure 49 is:
Periodic Ranging Region
Information
The SS sends this message to provide ranging detection to
the BS for connection maintenance using information
received in the Periodic Ranging Region. This message
serves as a request by the SS for continued uplink resources
from the BS. Information contained in this message includes:
• Frame Number (FN): The frame number at which the BS
detected Periodic Ranging
• Detected Position (DP): The time at which the BS
detected Periodic Ranging
• Ranging Code (RC): The Ranging Code value sent by the
BS and then used by the SS to gain access to allocated
uplink resources
• Frequency Offset (FO): The Frequency Offset detected
between the SS and the BS during Periodic Ranging