User`s guide
172 E6651A User’s Guide
A Appendix A - Network Entry Procedure
Network Entry Procedure Overview
A Mobile WiMAX subscriber station (SS) executes the
Network Entry procedure in order to begin two way
communications with any base station, including the E6651A
Mobile WiMAX Test Set. The SS executes this procedure
after acquiring relevant information from broadcast
messages.
The initial registration procedure of the SS can be
summarized as follows:
Scanning for Downlink
Channel
The SS scans a Mobile WiMAX base station (BS) signal and
determines whether the signal level is strong enough to
provide adequate service quality.
Downlink Synchronization The SS executes a synchronization procedure to obtain
downlink channel information from the BS.
After acquiring synchronization, the SS obtains downlink
and uplink information from the BS.
Obtaining Uplink Parameters Using downlink information, the SS obtains uplink
information for the Ranging and Registration procedures.
Execution of Ranging
Procedure
Using the acquired uplink information, the SS executes the
Ranging procedure which includes the adjustment of time,
frequency and power parameters to meet the uplink burst
allocation.
The Ranging algorithm used in Mobile WiMAX 1.A is the
“CDMA Initial Ranging” algorithm. When this algorithm is
used, the SS transmits an “Initial Ranging Code” in an Initial
Ranging Region allocated by the BS.
Negotiation of Basic
Capabilities
The SS negotiates physical layer properties and capabilities
with the BS.
Registration With the BS The SS provides information to the network and receives
information from the network in order to register with the
Mobile WiMAX service.
The Network Entry procedure is complete at the end of the
Registration Procedure. From this point on, the SS executes
a Periodic Ranging procedure to assist in maintaining a
reliable connection with the network.