1. 4G core network to 5G issues. 2. Project information.

1. The Way to 5G
Dr. Whai-En Chen
Associate Professor and Director
Library and Information Center
Dept. of Computer Science and Information Engineering
National Ilan University
Email: wechen@niu.edu.tw

2.  Communication Evolution
 4G Architecture
 Evolved Packet Core (EPC)
 IP Multimedia Subsystem (IMS)
 5G Research Topics @ NIU
2
Outline

3. 4G Architecture
3
SAE Gateway
Core NetworkRAN
System Architecture Evolution (SAE)

4.  eNode B: Based Station.
 S-GW: Serving Gateway
 P-GW: Packet Data Network (PDN) Gateway
 MME: Mobility Management Entity
 HSS: Home Subscriber Server
 PCRF: Policy and Charging Rules Function
 RAN: Radio Access Network
4
EPC Components

5.  The SGW routes and forwards user data packets, while
also acting as the mobility anchor for the user plane during
inter-eNodeB handovers and as the anchor for mobility
between LTE and other 3GPP technologies.
 For idle state UEs, the SGW terminates the downlink data
path and triggers paging when downlink data arrives for
the UE.
 It manages and stores UE contexts, e.g. parameters of the
IP bearer service, network internal routing information.
 It also performs replication of the user traffic in case of
lawful interception.
5
Serving Gateway (SGW)

6.  The PDN Gateway provides connectivity between the
UE and external packet data networks.
 The PGW performs policy enforcement, packet
filtering for each user, charging support, lawful
interception and packet screening.
 The PGW acts as the anchor for mobility between 3GPP
and non-3GPP technologies such as WiMAX
6
PDN Gateway (PGW)

7.  The MME is the key control-node handling signaling
messages for the LTE access-network.
 It is responsible for idle mode UE (User Equipment) paging
and tagging procedure including retransmissions.
 It is involved in the bearer activation/deactivation process
and is also responsible for selecting the SGW for a UE at
the initial attach and at time of intra-LTE handover
involving Core Network (CN) node relocation.
 It is responsible for authenticating the user by interacting
with the HSS.
7
Mobility Management Entity
(MME)

8.  The HSS is a central database that contains user-
related and subscription-related information.
 The functions of the HSS include functionalities such as
mobility management, call and session establishment
support, user authentication and access authorization.
 The HSS is based on pre-Rel-4 Home Location Register
(HLR) and Authentication Center (AuC).
8
Home Subscriber Server (HSS)

9. IP Multimedia Subsystem (IMS)
9
Source: ZTE
IMS Applications
and Services
Fixed and Mobile Networks
(UMTS, WiMAX, LTE, …)
IMS is used for handling
the signaling to control
Multimedia transmission.

10. Architecture for 5G Network
ePDG
SAE Gateway
+
MME
eNB eNB
Small
Cell
Small
Cell
Router Router
SDN
Controller
Firewall
Internet
HN-OVS
Cloud
System
IoT Application Servers
+
IP Multimedia Subsystem (IMS)

11. RAN Technologies
ePDG
SAE Gateway
+
MME
eNB eNB
Small
Cell
Small
Cell
Router Router
SDN
Controller
Firewall
Internet
HN-OVS
Cloud
System
IoT Application Servers
+
IP Multimedia Subsystem (IMS)
1.Huge Access
2.Small Data
3.MAC Improve
4.Energy

12. Based Stations and Gateway
ePDG
SAE Gateway
+
MME
eNB eNB
Small
Cell
Small
Cell
Router Router
SDN
Controller
Firewall
Internet
HN-OVS
Cloud
System
IoT Application Servers
+
IP Multimedia Subsystem (IMS)
1.Network Planning
2.Energy Saving
3.Heterogeneous
Network

13. Core Network
ePDG
SAE Gateway
+
MME
eNB eNB
Small
Cell
Small
Cell
Router Router
SDN
Controller
Firewall
Internet
HN-OVS
Cloud
System
IoT Application Servers
+
IP Multimedia Subsystem (IMS)
1.IPv6 and NAT
2.SDN
3.Efficiency
4.QOS and Security

14. Cloud and Application
ePDG
SAE Gateway
+
MME
eNB eNB
Small
Cell
Small
Cell
Router Router
SDN
Controller
Firewall
Internet
HN-OVS
Cloud
System
IoT Application Servers
+
IP Multimedia Subsystem (IMS)
1.Performance
2.Reliability
3.NFV
4.Energy
5.New Service

15.  Now, we are using 4G communications and moving to 5G
communications (year 2020; coming quickly).
 Due to the rapid development of wireless and mobile
communications, many countries start to study 5G requirements
and develop 5G technologies based on the requirements.
 This presentation shows an example of the network
architecture and the current issues for 4G in different layers.
 We may further discuss these issues for improving 4G to Beyond
4G (B4G) and 5G.
15
Conclusions

16. Cooperation on
5G Research Center
Discussion
Contact: wechen@niu.edu.tw