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 Network Entry Procedure can be summarized as follows:
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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. |
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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. |
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Obtaining Uplink Parameters |
Using downlink information, the SS obtains uplink information for the Ranging and Registration procedures. |
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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 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. |
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Negotiation of Basic Capabilities |
The SS negotiates physical layer properties and capabilities with the BS. |
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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. |
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Establish Connection |
After Registration is complete, a connection for the service flow is created. |
After the Network Entry procedure is complete, the SS executes a Periodic Ranging procedure to assist in maintaining a reliable connection with the network.