Dual Connectivity for LTE-NR Cellular Networks: Challenges and Open Issues

Roberto Antonioli, Gabriela Parente, Carlos Silva, Diego Sousa, Emanuel Rodrigues, Tarcisio Maciel, Francisco Cavalcanti
2018 Journal of Communication and Information Systems  
The Dual Connectivity (DC) technology has gained a lot of momentum in the LTE Release 12 as a means to enhance the per-user throughput and provide mobility robustness. Some studies in the literature have discussed the interworking between the LTE and the air interface of the upcoming Fifth Generation (5G) in a DC scenario. That integration may provide some benefits to meet the high throughput, reliability and availability requirements of the 5G networks. This work firstly presents a brief
more » ... ew of the DC technology considering the integration between 4G e 5G. Then, we highlight some open issues and challenges for future investigation involving Radio Resource Management (RRM) in such a scenario, which includes: (i) user-cell association, (ii) interaction between base stations and (iii) resource allocation. After that, we propose an extension of a utility-based resource allocation algorithm for DC scenarios. Finally, a performance evaluation is conducted in multi-Radio Access Technology (RAT) LTE-NR scenarios considering the bearer split configuration of the DC technology, where the gains provided by the proposed algorithm are demonstrated.
doi:10.14209/jcis.2018.28 fatcat:ilv5gur5zrgbxaskkhy5yaaq2e