User Manual

ProST Hardware Installation User Guide
Page 23 Commercial in Confidence UWB-D00111 Rev K
2.4.2 ProST Protocol Stack
Figure 7 - Protocol Stack
2.4.3 Theory of Operation
For basic operation, the ProST requires no initial configuration--simply plug and play.
Configuration is automatically performed over the air by the BS. The ProST is preconfigured by
the operator at the BS (using Netspan) with service flow parameters such as the maximum
information rate, the committed information rate, the maximum latency. These configuration
parameters are stored in Netspan's database corresponding to the ProST's MAC address.
Before any communication between ProST and BS can occur, the ProST must be positioned in a
location that provides sufficient RF reception.
To join a network, the ProST needs to perform a few tasks. First, the "Network Entry" process
(defined in 802.16-2004) begins with the ProST scanning for a downlink (DL) signal from the base
station, and then synchronizing to the DL channel. Thereafter the ProST can start the process of
initial ranging, which alerts the BS to the presence of the ProST and establishment of
management connections to obtain basic and primary management connection IDs (CID) from
the BS. After the CIDs have been obtained, the ProST commences authorization and key
exchange. In the final stage, the ProST registers at the base station before obtaining the IP
address, time of day and the configuration file.
During Network entry, the ProST sends the BS its MAC address. The BS then accesses
Netspan's database (via SNMP) and checks whether the ProST's MAC address appears in the
DB. If it locates the MAC address, the BS retrieves all the ProST's configuration parameters
(service flows) from the DB and downloads them to the ProST device.