Design And Implementation Of Cloud-RAN Precoding For Intelligent Networked Devices

The cloud radil access network(CRAN)has emerged as a promising architecture to cope with the rapid growth of mobile data traffic abd the high cost and high energy consumption caused by the dense deployment of base stations.At the same time,the Internet of Things becomes an important application scenario for the future network.As a typical device in the Internet of Things scenario,the mobility of intelligent networked device requires that the radio access network is capble to massive data access,flexibility and service seam switching.The CRAN architecture will become the main architecture of the future access network and cope with massive data access through a hierarchical access network architecture.How to combine the hierarchical advantages of CRAN architecture with precoding technology to cope with the increasingly diversified needs of users'needs and to meet the new requirements for intelligent networked devices to seamlessly switch services has become a new research topic.This paper follows the latest standards and architecture of the 3GPP(The 3rd Generation Partnership Project)for access network part.We makes full use of the advantages of the three-tier hierarchical CRAN architecture in terms of coverage,flexibility,and scalability.We combines the OAI project to build an platform for intelligent networked.The CRAN architecture is divided into a CU(central unit,CU),a DU(distributed unit,DU),and a RRU(remote radio unit,RRU).The intelligent networked devices access platform supports flexible structure division.The access network can be various in different degrees according to different actual service requirements,which can effectively cope with the increasingly diversified user service requirements.The intelligent network connection device access platform is flexibly divided according to the NGFI protocol.By moving lower function part of physical layer down to the radio unit and renamed radio unit as remote radio unit.We can reduce part of processing pressure of the baseband processing while the platform is more easy to upgrad,more scalability and more flexibility.When the service switching is performed by the intelligent networked devices of the CRAN architecture and the pre-coding technology,only the switching between the L1 layer and the L2 layer is involved,and the L3 handover is not involved,so the platform of intelligent network devices can finish seam switching.