Abstract
In order to meet the quality requirements of various communication services in the advanced 5G era around 2025, the authors have proposed an Adaptive radio access network (RAN) that changes the placement of virtualized base station functions according to the services. In Adaptive RAN, each base station function has its own scheduler, and multiple schedulers share common radio resources. Therefore, in order to guarantee communication quality for more users, it is necessary to control the allocation of the radio resources required for scheduling to each base station function with neither excess nor deficiency. This allocation control is performed based on the information collected from the base station functions by the RAN intelligent controller (RIC). If a large amount of information is used for control, allocation can be performed with higher accuracy, but the collection of information overuses the limited bandwidth of the network. Therefore, it is necessary to reduce the information volume required for control while at the same time guaranteeing communication quality. In this paper, we propose a method that guarantees communication quality while reducing the information volume required for control by combining a required resource estimation control in a long cycle and a resource allocation modification control based on feedback information related to communication quality in a short cycle. We evaluated the impact of the proposed method on communication quality compared to conventional methods through simulation, and verified that the proposed method can guarantee better communication quality than conventional methods while suppressing the increase in information volume.
Highlights
The 5th generation mobile communication system (5G system) has been launched in numerous countries since around 2020
To meet the quality requirements of various more advanced services provided for individual user equipment (UE), we have proposed an Adaptive radio access network (RAN) [2][3], in which virtualized base station functions are flexibly deployed to different sites based on the service requirements
The physical resource blocks (PRBs) are allocated to the virtualized distributed units (vDUs) that accommodate lowlatency services and are prone to quality deterioration, thereby reducing the communication quality deterioration
Summary
The 5th generation mobile communication system (5G system) has been launched in numerous countries since around 2020. Adaptive RAN consists of multiple virtualized central units (vCUs) and virtualized distributed units (vDUs) corresponding to the characteristics of multiple communication services, which are connected to a radio unit (RU) Achievable communication performance, such as bandwidth required for transport links, communication delay, and the ability to support intercell coordination, depends on the placement of the vCU and vDU. The proposed method is achieved by combining a function for estimating the PRBs required by vDUs based on information collected over a long period and a function for correcting the allocation based on feedback information related to communication quality.
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