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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
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