3G WCDMA Networks

Blocking and Dropping Rates

Figure: Blocking and Dropping Rates

During the dynamic simulation the rates of blocked and dropped mobiles are recorded. A mobile is blocked if not enough resources are available to serve this new mobile (e.g. power limit, code limit, pilot coverage). These conditions are checked for a certain period of time after the mobile has come up (connection establishment phase). On the other hand if the required link quality in terms of received Eb/N0 target is missed for a certain period of time (connection hold time) the mobile station is dropped. This happens for example if a mobile station leaves the coverage area or if it enters a new cell without enough resources.
The following figure depicts the blocking and dropping rate for a series of simulations with increasing traffic load. The strong increase in blocking is due to the fact that the network capacity is nearly reached and it is still tried to fill the system. In this case a large part of the traffic increase is blocked.

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