ABSTRACT
This chapter discusses cooperation and coexistence mechanisms for radio resource management (RRM) of heterogeneous systems. The concepts are based on research work carried out within the IST project WINNER (phase 1 and phase 2) [1]. The referenceWINNER system is a candidate next generation wireless communication system. Section 15.1.1 gives an overview of the current heterogeneous networks and their requirements. A brief overview of the platforms for heterogeneous RRM management is also given. Section 15.1.2 describes the state of the art in cooperative RRM. In particular, we describe combined RRM, common RRM, layered RRM and, as an advance of the state of the art, hybrid RRM. Section 15.2 describes an architecture that is proposed for the support of cooperative RRM including the functionalities of the physical and logical entities. Three different approaches to the cooperation architecture are described: the distributed approach, the centralized approach, and the hybrid approach. Further, Section 15.2 describes the decision-makingmechanisms required for the execution of the cooperative RRMmechanisms. Section 15.3 describes the cooperative system functions, for support of active/idle mobility management, location service and updates, congestion avoidance control, quality of service (QoS), and security. Section 15.4 describes the various algorithms proposed for cooperative RRM. These are algorithms for mobility management, congestion avoidance control, QoS, and security. Both, evolutionary from traditional schemes and novel methods (based on computational intelligence) for RRM are described. The algorithms are assessed in terms of advantages and disadvantages for different scenarios. Section 15.5 describes how the proposed algorithms can be implemented onto a suitable platform. Here, we describe the required low-level and high-level entities and their functionalities. Section 15.6 concludes the chapter and proposes directions for future challenges and research. Suitable cooperation mechanisms are currently being investigated with respect to vertical handover, authorization, authentication, and accounting (AAA), and common RRM.
