Using the initial ranging region information and initial ranging code information obtained from the UL-MAP and UCD messages, the SS attempts the OFDMA Contention Based Initial Ranging procedure.
The E6651A measures the quality of the initial ranging code. When the E6651A receives this CDMA code, provided that the code quality exceeds a specified threshold, the E6651A 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 from the SS.
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. When the E6651A receives the RNG-REQ, it sends a RNG-RSP to the SS. The RNG-RSP contains the the MAC address of the SS to allow the E6651A to uniquely identify the SS and verify it is allowed to connect to the network. At this point the physical connection is established between the SS and the Test Set.
The last RNG-RSP sent by the E6651A allocates the basic and primary CIDs to the SS. In the next step of the network entry procedure, known as “Basic Capabilities Negotiation”, the SS sends an SBC-REQ message to the E6651A. In order to send this, or any uplink message, the SS sends CDMA code in the BW Req Ranging Region. The E6651A uses the CDMA allocation IE. to provide an uplink allocation to the SS.
The SS may then send a Bandwidth Request header to the E6651A to request a specific size of uplink allocation to allow it to send the desired message. The E6651A then allocates an uplink burst to the SS. The SS may then send the desired message to the E6651A in the UL-MAP. After receiving the SBC-REQ message from the SS, the Test Set responds with an SBC-RSP message. The SBC-REQ and SBC-RSP message pair constitutes the negotiation of basic physical layer properties between the SS and the BS.
The Initial Ranging Procedure and Negotiation of Basic Capabilities as seen in the Message Window of the BS Emulator display.
The messages seen in the Initial Ranging Procedure and Basic Capabilities Negotiation of are:
The SS sends this message to provide ranging detection to the BS using information received in the Initial Ranging Region. This message serves as the initial request by the SS for uplink resources from the BS. Information contained in this message includes:
|
Frame Number (FN) |
The frame number at which the BS detected Initial Ranging |
|
Detected Position (DP) |
The time at which the BS detected Initial 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 Initial Ranging |
|
Ranging Matching Rate (RM) |
Indication of the quality of the received CDMA code |
|
Ranging Power (RP) |
The power information for the Initial Ranging Code |
This is the response to the Ranging Code or RNG-REQ message sent from the MS to the BS. Information contained in this message includes:
Timing Adjustment
Power Level Adjustment
Frequency Offset Adjustment
Ranging Status
DL Frequency Override
UL Frequency Override
Burst Profile
SS MAC Address
CID
This is the ranging request message sent from the SS to the BS during the ranging procedure. Information contained in this message includes:
Requested DL Burst Profiles
SS MAC Address
Ranging Anomalies
SS Broadcast Capabilities
The SS sends this message to the BS to initiate the negotiation of basic physical layer properties. Information contained in this message includes the capabilities of the SS to support various protocol and PHY features:
Supported PHY parameters
Supported Bandwidth allocations
The BS sends this message to the SS to indicate which of the features in the SBC-REQ will be supported. Information provided in this message includes:
Supported PHY parameters
Supported Bandwidth allocations