User`s guide

176 E6651A User’s Guide
A Appendix A - Network Entry Procedure
Initial Ranging Procedure Execution and Basic Capabilities Negotiation
Using the initial ranging region information and initial
ranging code information obtained from the UL- MAP and
UCD messages, the SS attempts the Contention Based Initial
Ranging procedure.
The E6651A measures the quality of the initial ranging code.
Provided that the code quality exceeds a specified threshold,
the unit sends the ranging code, time offset, frequency offset
and power offset through the RNG- RSP message and
provides CDMA Allocation IE information through UL- MAP.
CDMA Allocation IE information is used in the transmission
of the RNG- REQ message.
When the RNG- RSP message and CDMA Allocation IE is
received from the Test Set, the SS sends the RNG- REQ
message in the uplink region specified in the CDMA
Allocation IE.
Upon successful exchange of the RNG- REQ and RNG- RSP
messages, the physical connection is established between the
SS and the Test Set. At this point, the SS and the Test Set
share information including the Basic CID and the Burst
Profile.
In the next step of the Initial Ranging Procedure, known as
“Basic Capabilities Negotiation”, the SS sends the BW
Request message to the Test Set. Upon receipt of the BW
Request message, the Test Set sends an ALLOC UL- MAP
message, containing information about the bandwidth that
the unit has allocated to the SS.
The SS provides its PHY and Bandwidth Allocation
information by sending SBC- REQ messages using the uplink
resources allocated by the Test Set. After receiving the
SBC- REQ message from the SS, the Test Set responds with
an SBC- RSP message to the SS. The SBC- REQ and SBC- RSP
message pair constitutes the negotiation of basic physical
layer properties between the SS and the BS.