VERFAHREN UND SYSTEM ZUR ZUORDNUNG EINES KANALS MIT ZUFALLSZUGRIFF IN EINEM FUNKKOMMUNIKATIONSSYSTEM

摘要

A radio communication system has a random access channel for the transmission of data ( 214 ) from a secondary station to a primary station. Such a channel is intended for use by secondary stations having data ( 214 ) to transmit to a primary station while not actually engaged in a call. A problem with known systems of this type is that a secondary station requesting access also specifies which of a plurality of resources it wishes to access. If that resource is busy access is denied, even if other suitable channels are available. In the present system allocation of a channel is performed by the primary station when acknowledging ( 206,210 ) a secondary station's access attempt ( 202,208 ), thereby eliminating wasted attempts. In one embodiment the primary station also periodically broadcasts a short message indicating the availability of channels for access attempts.