4.1.2 Centralized SON

28.3133GPPManagement and orchestrationRelease 17Self-Organizing Networks (SON) for 5G networksTS

4.1.2.1 Introduction

Centralized SON (C-SON) means that the SON algorithm executes in the 3GPP management system. The centralized SON concept has been defined for LTE in TS 32.500 [2].

Figure 4.1.2.1-1 shows a generic C-SON process, where the SON algorithms execute in the 3GPP management system interact with network functions in RAN and/or CN to implement SON functions. The SON algorithm may consist of the following functionalities:

– Monitoring: monitor the network(s) by collecting management data, including the data provided by MDAS.

– Analysis: analyse the management data to determine if there are issues in the network(s) that need to be resolved.

– Decision: makes the decision on the SON actions to resolve the issues.

– Execution: execute the SON actions.

– Evaluation: evaluate whether the issues have been solved by analysing the management data

NOTE: The management data as well as the exact algorithm may vary for different SON cases. For example, for automated creation of NSI, NSSI and/or NFs related cases, the management data may be SLA requirements received from service management layer; for automated optimization related cases, the management data may be performance measurements of the networks; for automated healing related cases, the management data may be alarm information of the networks. The management data and the algorithm are to be specified case by case.

Figure 4.1.2.1-1: C-SON process

4.1.2.2 Cross Domain-Centralized SON

The Cross Domain-Centralized SON means that the SON algorithm executes in the 3GPP Cross Domain layer.

For Cross Domain-Centralized SON, the MnF(s) in 3GPP Cross Domain layer monitors the networks via management data, analyses the management data, makes decisions on the SON actions, and executes the SON actions.

4.1.2.3 Domain-Centralized SON

The Domain-Centralized SON means the SON algorithm executes in the Domain layer.

For Domain-Centralized SON, the MnF(s) in Domain layer monitors the networks via management data, analyses the management data, makes decisions on the SON actions, and executes the SON actions.

The MnF(s) in 3GPP Cross Domain is responsible for management and control of the Domain-Centralized SON function. The management and control may include switching on/off a Domain-Centralized SON function, making policies for a Domain-Centralized SON function, and/or evaluating the performance of a Domain-Centralized SON function.