dditionally, they are supposed to undertake basic computation functions, while topper domains will compute more to adjust and control lower domains, including network performance, resource distribution, dynamic best network routes, and SO on. Communications and interactions among same-level domains should be man- aged by domain servers. Every level contains at least one domain server to control and manage domain interactions, especially communications and decision making within the same-level domains. 6.3.4 Cognitive NGSDP On the basis of cognitive functions and domain design pattern, our group integrated cognitive functions with NGSDP and then proposed Cognitive NGSDP model. In Overview of Cognitive NGSDP Model Whole Telecom network systems system 1-level top domain 2-level sub domain 3-level sub domain Figure 6.5 Cognitive domain design pattern. this section, the model is introduced, while relevant theories, technologies, and feasible solutions are also discussed for further implementation of the network architecture of Cognitive NGSDP. 6.3.4.1 Model The Cognitive NGSDP model was first proposed in Refs. [5,6], and it can be repre- sented by Figure 6.6, which combines NGSDP model with cognitive functions. As described in Ref. [5], the intelligent and cognitive SDP can be divided into three layers. 1. Network layer: The bottom layer is network layer which involves basic net- works and the abstraction layer of NGSDP. The capability of self-awareness can be adopted here to recognize flow rates and collect related data. All these data will be the basis of advanced cognitive functions. 2. Service/Business layer: In this layer, services are created, deployed, and exe- cuted according to predefined logical rules. Service enablers are provided to control the processes of services and businesses. Functions of self-interacting, self-reasoning, or self-sustaining are needed to keep the whole process work- ing correctly and orderly. The capability of self-organization can be added to enhance and protect the original functio