BBU KDDI R&D LABS, Panasonic, Osaka University, Tokyo Institute of Technology (JP) Fraunhofer Heinrich-Hertz-Institut, Intel Mobile Communications, Commissariat à l’Energie Atomique, Orange Labs, Politechnico di Milano (EU) Project website: http://www.miweba.eu/ Prototype of Control and User plane splitting Heterogeneous Cellular Networks Concept & Architecture of C/U-splitting HetNet * Prototype of C/U-splitting HetNet C-plane Macro cell Traditional cellular bands New frequency bands Frequency UHF SHF Millimeter-wave Background Concept of C/U-splitting HetNet * HetNet: Heterogeneous Networks 700MHz – 3.5GHz 6GHz – 70GHz Propagation Characteristics Available Bandwidth Good low penetration loss mm Small cell Large bandwidth x Dense deployment Extreme capacity (for user data) User(U)-plane data Low frequency Connectivity (for control) Split! Serving GW Cellular WiGig eNB MME WiGig Service Network X2 interface Architecture of MiWEBA prototype using LTE and WiGig (under development) Architectural alternatives • Single-RAT solution • Multi-RAT solution mm Small WiGig PHY&MAC Wrapper function LTE eNB Master eNB /RRC Macro LTE PHY&MAC Secondary eNB Centralized Mobility Control & Radio Resource Management LTE (<6GHz) LTE (<6GHz) Antenna LTE (6-70GHz) Unified architecture of LTE-Advanced (LTE-A) and Further enhanced LTE-A (including both licensed and license-assisted unlicensed spectrum) Interworking between Multiple Radio Access Technologies (RATs) (including further enhanced LTE, Wi-Fi, WiGig or New 5G RAT ) LTE BBU BBU LTE BBU Centralized BBU ORI fronthaul LTE backhaul (e.g. S1, X2) PHY&MAC should be revised for mm-wave Service Network Core Network (EPC) ORI: Open Radio Interface LTE: Long Term Evolution BBU: Baseband Unit EPC: Evolved Packet Core RRM: Radio Resource Management C/U-splitting within Centralized BBU or between BBU via X2 LTE (<6GHz) WiGig (60GHz) New RAT (-70GHz) Service Network LTE BBU WiGig BB New RAT BBU Core Network (EPC) Multi- RAT RRM C/U-splitting between Multiple RATs Development plan C/U-splitting HetNet using LTE • FY2013 (Finished) • FY2014-FY2015 (Under development) BBU+RF Conventional BS UE LTE Macro cell LTE Small cell MME/S-GW (2GHz) (3GHz) U-plane Fading Simulator LTE Macro cell LTE Small cell (2GHz) (3GHz) Fading Simulator C/U-splitting HetNet using LTE (2GHz/3GHz) UE ORI fronthaul with I/Q compression RRH LTE eNB WiGig eNB mm mm mm WiGig Small cell (60GHz) Control(C)-plane signaling LTE eNB Indoor Air C/U-splitting HetNet using LTE and WiGig UE BBU+RF MME/ S-GW Fading Simulator LTE eNB • Developed hardware Macro cell (2GHz) Small cell (3GHz) • Throughput test result while moving UE 0 2 4 6 8 10 12 0 2 4 6 8 10 12 14 16 18 20 Throughput[Mbps] Time[s] Total (C/U splitting) Macro cell (C/U splitting) Move UE from Macro to Small Control plane signaling sent from Macro cell UE receives the U-plane data from small cell, while keeping the C-plane handled by macro cell Switch without interrupt Parameter Value Radio Access DL: OFDMA UL: SC-FDMA DL Carrier freq. Macro: 2160MHz Small: 3385MHz DL bandwidth 10MHz Antenna conf. 1x1 (SISO) Radio access technology LTE based Poor heavily utilized Tricky high penetration loss Rich not utilized for mobile Get the advantages of both bands Centralized Control