System Architecture

2018 Fall 5G

(2)

Tomohisa Wada

Information Engineering

1

5G CORE NETWORK

User

Plane

Func.

Access Mobility Func.

Session Management

Func.

Control

Plane

Func.

Policy

Control

Func.

Old Evolved Packet Core (EPC) +

5G CORE NETWORK

3LTE NR

Radio-access network interfaces

4

User Plane

Func.

Access Mobility

Func.

UE

Uu Interface

Xn Interface

Central Unit

Distributed

Unit

Boost Data Rate by Dual Connection

5

NRLTE

QoS Quality of Service

(Delay and Data Rate control)

6User Plane

Func.

Protocol stack

Service Data Application ProtocolPacket Data Convergence Protocol

Radio-Link Control

Medium-Access Control

Physical layer

Radio Resource Control

NR Downlink user-plane protocol architecture

as seen from the device

<- Only 5GCN

To other cells

in case of dual connectivity

Map QoS to Radio

bearer

IP header compress

ciphering

Segmentation

retransmission

Multiplex of logical channel

Hybrid-ARQ retransmission

scheduling

User-plane data flow

Map QoS to Radio

bearer

IP header compress

ciphering

Segmentation

retransmission

Multiplex of logical channel

Hybrid-ARQ retransmission

scheduling

Dual connectivity

Logical, Transport, Physical Channels

Broadcast

Control

Paging

Control

Common

Control

Dedicated

Traffic

(User Data)

Dedicated

Control

(Control

Info)

DL

Control

Info

Random

Access

Transport-format selection in DL and UL

12

NR UL uses OFDM not DFT-precoded OFDM

13

Subcarrier Space of NR

14

Same As LTE

OFDM Symbol in NR

15

Frames, subframes and slots in NR

16

Lower-latency

Transmission

No DC subcarrier in NR

17

Bandwidth adaptation

18

Carrier Aggregation

19

16 x 400MHz = 6.4GHz

20

Duplex Schemes:

TDD, FDD and

more