Saturday, April 30, 2016

The Importance of DCD and UCD

The DCD and UCD are important because they deal with the MAC of Subscriber Station (SS) by providing organizing information that useful when a SS is capable to send and receive data. The DCD message provides information when the SS is potentially to receive data. This is accomplished by recounting which frame the DL process will start on and the period of the process itself.

The UCD messages gives the SS with information of when it is capable to either re synchronize the channel that is currently in use or send data to the Base Station.

To obtain this channel descriptor messages the SS shall scan the whole downlink frequency band used for downlink channel. When a downlink channel is found then the MAC will attempt to set up synchronization with the BS through that one channel.

In an non-erroneous network, the SS should obtain UCD and DCD messages for the synchronized channel. From this messages the SS is capable to characterize the process and timing of the network that will let it to transmit data and receive data as well.

At the completion of the remaining core network entry procedures the SS is able to network with the BS and utilizing the channel that it has first found in the scanning step.

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