design of multi-rat virtualization architectures in lte-advanced wireless network location:...
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Design of Multi-RAT Virtualization Architectures in LTE-AdvancedWireless Network
Location:國立暨南國際大學電機系Source: ICIC Express Letters, vol. 8, no. 5, May 2014, p
p. 1519-1529. (EI)Speaker:麥毅廷Date:2014/06/12Contact Info.: [email protected]
22
Outline
New 3GPP standard– LTE– LTE-Advanced
Related work-UMTSMulti-RAT Virtualization ArchitecturesPerformance AnalysisConclusion
333
Evolution for 3GPP
International Telecommunication Union (ITU)– Identified the frequencies around 2GHz for International Mobile
Telephony 2000 (IMT 2000)
IMT 2000 spectrum allocation at 2GHzUMTS (WCDMA), LTE, LTE-A
R11, R12
444
2G->4G
LTE-A1Gbps
5555
Introduction
3GPP Long Term Evolution (LTE) and IEEE 802.16 WiMAX are competing access network technologies in 4G wireless networksLTE not only can offer traditional voice telephony service, but also can provide cost effective broadband communication servicesIn the enhanced LTE version, LTE-Advanced, the transmission bandwidth has been further increased
6666
3GPP networks
RAN domains
GSM/GPRS
WCDMA/HSPA
LTE
Non-3GPP
Core network
GSM/GPRS
GSM/GPRS
Circuit core domain
User mgmt IMS domain
Packet core domain
7
3GPP core network3GPP
GERAN
Internet
Trusted Non 3GPPIP Access
SGSN
MME
eNBServing
GWPDNGW
HSS
PCRF
ePDG
UE
UE
Trusted/UntrustedNon 3GPP/3GPP IP
Access
UntrustedNon 3GPP IPAccess
UTRAN
Operators IPServices
LTE-Un
S1-MME
S3 S4
S10
S11
S1u
X2
S6a
S5/S8(roaming)
S7
Rx+
SGi
S2b
S2a
S2c
Wn*
8
LTELTE architecture
eNB
MME P/S-GW
eNB
eNB
S1-MME S1-U
S1-MME S1-U
X2
X2X2
E-UTRAN
UE
UuUu
EPC
UE
9
LTE device
Serving Gateway (SGW)– Routes and forwards user data packets
Packet Data Network Gateway (PDN GW)– Provides connectivity to the UE to external pa
cket data networks (Internet)Mobility Management Entity (MME)– Manages and stores UE contexts
eNodeB (eNB)User Equipment (UE)
10101010
LTEFunctionality of EPC & E-UTRAN
Internet
P-GW
Mobility Anchor
RB control
Connection Mobility Controller
Inter cell RRM
PHY
MAC
RLC
PDCP
NAS RRC
PHY
MAC
RLC
PDCP
Dynamic Resource Allocation(Scheduler)
eNB Measurement Configuration & Provision
Radio Admission control
RRC
UE IP Address allocation
Deep Packet Inspection
EPS Bearer Control
Idle state mobility
NAS security
User Plane
Control Plane
S1-MME
S1-U S5/S8
P-GW
S-GW
MME
eNBUE
EPCE-UTRAN
S11
SGi
11LTE bearer SAE bearer
Transmission unit
12
LTEEPS bearer architecture
P-GWS-GW PeerEntity
UE eNB
EPS Bearer
Radio Bearer S1 Bearer
End-to-end Service
External Bearer
Uu(Radio) S5/S8
Internet
S1-U
E-UTRAN EPC
SGi
E-RAB S5/S8 Bearer
13
Control Plane Protocol Stack
MMEUE eNB
MAC
L1
RLC
PDCP
RRC
NAS
MAC
L1
RLC
PDCP
L2
L1
IP
SCTP
L1
L2
LTE-Uu S1-MME
RRC S1-AP
IP
SCTP
S1-AP
NAS
14
User Plane Protocol Stack
P-GWS-GWeNBUE
MAC
L1
RLC
PDCP
IP
Application
MAC
L1
RLC
PDCP
L2
L1
UDP/IP
GTP-U
L2
L1
UDP/IP
GTP-U
L1
IP
L2
L1
UDP/IP
GTP-U
L2
UDP/IP
GTP-U
LTE-Uu S1-U S5/S8 SGi
151515
Overview of LTE & LTE-Advanced
MME/S-GW MME/S-GW
eNB
X2
S1S1S1S1
EPC
E-UTRAN
E-UTRA
Uu
Uu
Un
How to connect?
E-UTRAN
16
LTE-Advanced
Layer1 RN– Amplify and Forward
Layer2 RN– Decode and Forward
Layer3 RN– Radio Resource Management
17171717
UMTS
Universal Mobile Telecommunications System (UMTS) is a third generation mobile cellular technology (3G) for networks based on the GSM standard.Since 2006, UMTS networks in many countries have been or are in the process of being upgraded with High Speed Downlink Packet Access (HSDPA), sometimes known as 3.5G.
18181818
NB
MSC SGSN
NB
NB
Iu-CS Iu-PS
Iu-CS Iu-PS
Iur
IurIur
UTRAN
UE
UuUu
UE
Iub
Iub
Iub
Iu-CS Iu-PS
RNC RNC
RNC
UMTS architecture-1
19191919
UMTS vs. LTE
From internet
20202020
UMTS architecture-2
21212121
Virtualization Architecture
GPRS MS
TD-SCDMA UEUMTS UE
GSM MS
LTE UE
Multi-RATBase Station
Virtual
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Physical Hardware
Hypervisor
Mux/DeMux Spectrum allocationUnit
Virtual DeNB
PHY L1
MAC
RLC
PDCP
L2
IP IP
UDP UDP
GTP-U GTP-U
Spe
ctru
m
Con
fig. &
BW
es
timat
ion
Virtual eNB/EUTRAN
L1
L2
Spe
ctru
m
Con
fig. &
BW
es
timat
ion
IP
UDP
GTP-U
PDCP
PHY
MAC
RLC
VirtualRNC
Spe
ctru
m
Con
fig. &
BW
es
timat
ion
Resource allocation policy
Interface configuration hypervisor
VirtualNB/UTRAN
L2
Spe
ctru
m
Con
fig. &
BW
es
timat
ion
IP
UDP
WCDMA
PHY
Virtual interface Physical interface
GTP-U
UDP/IP
AAL5
ATML1
PDCP
RLC
MAC
FP
UDP
L1
IP
L2
Multi-RAT Virtualization Architecture
232323
Multi-RAT Virtualization support for LTE-Advanced network
UTRAN
E-UTRAN
Internet
LTE Core Network(EPC)
UMTS Core Network
LTE UE
DeNB
UMTS UE
LTE-Uu
GMSC
GGSN
MSC/VLR
SGSN
HLR
Gs
Gn
GcGr
D DP-GW
S-GW
S1-MME
LTE UE
LTE-Uu
S5/S8
S11
MMERNC
Iu-PS
Iu-CS
UMTS-Uu
LTE-Un
S1u
S12
S4
RN
SGi
S10
Gi
NB
UMTS UE
UMTS-Uu
Iub
UTRAN
E-UTRAN
UMTS Core Network
LTE UE
DeNB
UMTS UE
LTE-Uu
GMSC
GGSN
MSC/VLR
SGSN
HLR
Gs
Gn
GcGr
D D
LTE UE
LTE-Uu
RNC
Iu-PS
Iu-CS
UMTS-Uu
LTE-Un
RN
NodeB
UMTS UE
UMTS-Uu
Iub
242424
Proposed Arch_AUTRAN
Internet
LTE Core Network(EPC)
UMTS Core Network
GMSC
GGSN
MSC/VLR
SGSN
HLR
Gs
Gn
GcGr
D DP-GW
S-GW
S1-MME
S5/S8
S11
MMERNC
Iu-PS
Iu-CS
S1u
S4
SGi
S10
Gi
NB
UMTS UE
UMTS-Uu
Iub
Arch_A
E-UTRAN
LTE UE UMTS UE
LTE-Uu
LTE UE
LTE-Uu
UMTS-Uu
LTE-Un
RN
Virtual NB
WCDMAover LTE-Un
UMTS UE
UMTS-Uu
DeNB
252525
Proposed Arch_B
UTRANE-UTRAN
UMTS Core Network
LTE UE
DeNB
UMTS UE
LTE-Uu
GMSC
GGSN
MSC/VLR
SGSN
HLR
Gs
Gn
GcGr
D D
LTE UE
LTE-Uu
RNC
Iu-PS
Iu-CS
UMTS-Uu
LTE-Un
RN
Arch_B - By Intranet
VirtualNB&RNC
WCDMAover LTE-Un
UMTS UE
UMTS-Uu
26262626
Performance Evaluation-Qualitative
Metric Arch_A Arch_B
UMTS RNC Complexity
Serving UMTS-UE via EPC tunneling
IuPS (backhaul link) via Intranet
RN ComplexityUMTS-Uu (access link) and WCDMA tunnel (backhaul link)
DeNB ComplexityBearer management + NB Virtualization
Virtualization (NB and RNC)
LTE/UMTS CN Complexity
Bearer management S4 btw S-GW and SGSN
No impact
UMTS-UE Transmission Efficiency
Low High
Security Concern Low Middle
27
Inter-NB handover procedure
28282828
Performance Evaluation-Quantitative
Metric
HO latency (ms)Number of HO
signal
Arch_A Arch_B Arch_A Arch_B
Intra-NB handover
51 9 8 2
Inter-NB handover
179 107 22 16
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Conclusion
We propose two architectures to support Multi-RAT Virtualization for LTE-Advanced network via exist interface and All-IP core network connection
Those are achievable and novel Multi-RAT Virtualization architectures for future 4G wireless network.
Based on results analysis, our proposed Arch_B might have better performance. However, to apply Arch_A for different purposes is also an alternative solution.
