Key technologies for 4G/5G spectrum resource coordination

【Abstract】In order to make the resources of 5G and 4G better synergize and maximize the resource efficiency as a whole, this paper focuses on analyzing how 4G and 5G are deployed in the same frequency band according to 4G and 4G resources.The 5G network load maximizes the utilization of spectrum resources by dynamically sharing spectrum resources at the carrier level.Tests on the existing network have proved that carrier-level dynamic spectrum sharing can increase the number of 5G available RBs by 18% to 55% (compared with 60 M), and the downlink pull rate can be increased by 14% to 32%.4G/5G co-frequency deployment also needs to solve the inter-cell co-channel interference. Therefore, the focus is on frequency selection scheduling through subband CQI, thereby reducing the interference between 4G/5G. Through the current network test, 5G frequency selection scheduling is enabled, and the downlink rate can be adjusted.Increase by 15%~23%.It is recommended to enable carrier-level dynamic spectrum sharing and frequency selective scheduling functions in the early stage of 5G construction to improve spectrum resource utilization and network performance.

【Keywords】4G; 5G; interference processing; frequency selective scheduling; spectrum sharing; carrier-level dynamic sharing

0 Introduction

Although the 5G network has been commercialized, in the early stage of 5G construction, the 4G network is still the main bearer network and still faces huge capacity pressure. At present, 4G/5G is deployed on the same frequency. How can the limited spectrum resources be brought into full play?Essential for wireless networks.The construction of 5G network will introduce dual-mode equipment that supports 5G and 4G, based on hardware AAU (Active Antenna Unit, active antenna unit) to support 160 MHz full spectrum and software to support 4G/5G common mode, the connection between 4G and 5G will beSpectrum sharing can be achieved, that is, according to the characteristics of 4G and 5G services, the number of users, and traffic load, combined with the traffic allocation strategy between 4G carriers, the carrier system can be quickly switched to 4G/5G after 4G traffic migration.Realize the sharing of spectrum resources between 4G and 5G.In fact, multi-standard spectrum sharing, including GSM (Global System for Mobile C