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
WiG
ig
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
BBU
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
02468
1012
0 2 4 6 8 10 12 14 16 18 20
Thro
ughp
ut[M
bps]
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
