Motorola Corporation

Denis M McRae

Walter Frederick Lundby

Oleg A Panfilov

In a cellular communications system ( ) in which a plurality of mobile subscriber units ( ) attempt to access at least one BTS ( ), which is controlled by a controller ( ), a method of controlling system congestion is provided. The subscriber units ( ) record a number of failed access attempt transmissions ( ). The failed attempt data ( ) is transmitted ( ) to the BTS ( ) in subsequent access messages ( ). From the failed attempt data ( ), the controller ( ) generates an array of access restriction values ( ), which are transmitted to the subscriber units ( ) within the Access Parameters Message ( ). The access restriction values ( ) are used by the subscriber units ( ) to perform one or more persistence tests ( ). The access restriction values ( ) control the probability of the persistence tests ( ) passing for any given access slot. The present method provides dynamic control of system load, allowing for a higher percentage of successful call attempts when the system ( ) is experiencing a heavy load.

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Cary, IL, United States of America

Denis M McRae