With the increasing demands for a wireless communication network consisting of multiple air interfaces coexisting in the same operating area; with the increasing demands of multimedia user services and the emerging reconfigurable multi-mode terminal enabled by reconfigurable technologies, advanced Radio Resource Management (RRM) is needed to utilize the available system resource with performance improvement. In this thesis, the Joint Radio Resource Management (JRRM) schemes applicable for multi-standard radio access technologies or a network with multiple frequency layers in a service area are studied. This thesis contributes to the current discussions on 3G evolution w.r.t. increasing bandwidth demand, e.g. 10MHz for single users . With the introduction of requirements on future radio technologies, Software Defined Radio (SDR) as one important pool of technologies being expected is briefly introduced. The state of the art of the research activities and the functional architecture of SDR system with detailed
functioning models are unveiled. The JRRM modules for heterogeneous networks and multiple cell layers are explained. Two basic levels of JRRM approaches, namely Joint Session Admission Control (JOSAC) and Joint Session Scheduling Algorithm (JOSCH) based on one Radio Multi-Homing (RMH) approach (adaptive simultaneous radio links to a terminal) are introduced with necessary performance comparisons based on theoretical models and system level simulations.