Core Technology for the Wireless Network Virtualization May 23, 2011 Gahee Jo
Contents 2 Introduction Virtualization Wireless Network Virtualization Wireless Network Structure Evolution Core technology DU-RU separation GPP-based baseband processing platform Cognitive Radio RU ; stratified H/W design
Introduction Virtualization "a technique for hiding the physical characteristics of computing resources. includes making a single physical resource appear to function as multiple logical resources a server, an operating system, an application, or storage device include making multiple physical resources appear as a single logical resource. storage devices or servers
Introduction Necessity (Problems) Variety wireless network coexistence Increase rapidly traffic Next generation network technology Increase CAPEX and OPEX Increase data-charge Un-satisfy user desires Solution ; Wireless network virtualization Physical concentration Logical flexibility Easy evolution
Wireless Network Structure evolution Current Structure Variety wireless network coexistence Variety H/W and S/W coexistence Connection : Core Network, Internet OPEX (estate rental, electric rates) CAPEX (H/W addition and change) inefficient
Wireless Network Structure evolution
Wireless Network Structure evolution MSR(Multimode Standard Radio) 3GPP standard Equipment DU(Digital Unit) RU(Radio Unit) Interface CPRI(Common Public Radio Interface) MSR structure Frequency band change : New RU H/W Network evolution and extension : DU channel card change, S/W upgrade RNC function : DU and CN (S/W)
Wireless Network Structure evolution CR(Cognitive Radio)-SDR(S/W Defined Radio) Structure RU : LNA, Filter S/W upgrade << frequency DU : Cognitive Engine addition dynamic system resource and wireless radio resource allocation << user demand
Core Network 1) DU-RU separation 2) GPP-based baseband processing platform 3) Cognitive Radio 4) RU ; stratified H/W design
1) DU-RU separation CPRI protocol frame User Plane Data : sampling signal of wireless signal Information transmission : IQ Data Control & Management Data : DU-RU control information Urgent information : L1 in-band Protocol General information : Ethernet and HDLC Synchronization : time, frame L1 in-band Protocol :Layer1 link setup and information transmission
1) DU-RU separation CPRI protocol Collect DU 6 Data Rate 614.4Mbps~ 6,144Mbps Optical signal of DU-RU Interface Gigabit Ethernet NIC convey in a Baseband signal process
2) GPP-based baseband signal processing platform Cloud Computing System dynamic signal processing resource allocation System extension : equipment change DU plus GPP-based Cloud Computing System Reduce CAPEX and OPEX Economies of scale GPP : General Purpose Processor
2) GPP-based baseband signal processing platform Economic efficiency Increase clock speed NASA, SGI, Intel : 10PetaFLOPS(2012) IBM : 20PetaFLOPS(2011) 1exaFLOPS(2019) Improve CPU technology Reduce cost per gigaflops
2) GPP-based baseband signal processing platform Core-based Virtualization Signal and protocol processing Alternative to reduce clock speed Physical Layer Processing Parallel processing, multi-core allocation MAC/RLC/RRC protocol Processing 1 core per cell or user Uplink, Downlink
3) Cognitive Radio
3) Cognitive Radio proper load distribution >> dynamic resource allocation REM(Radio Environment MAP) : Wireless Characterization, Policy Cognitive Engine : feedback-based network management form network or User
3) Cognitive Radio Network structure, type of data transmission on bandwidth demand reduce CAPEX(<<On-Demand) and OPEX (<<energy saving)
4) RU ; stratified H/W design RU Installation on the Radio Top Decrease cost to rent place Avoid power and signal loss from feeder Stratified structure << Variety frequency coexistence << Many RU >> PA(power amplifier) efficiency improvement Low heat, scalability Easily interface with DU and optical fiber equipment
Thank you for attention!