5G SA Architecture: RRP, S-NSSAI, 5QI & DNN Relationships

📡 Radio Spectrum Allocation (RRP = Spectrum Chunks)

Example: n78 Band (3.5 GHz TDD)

RRP-A 55 MHz / 150 PRBs

RRP-B 45 MHz / 120 PRBs

3500 MHz 3555 MHz 3600 MHz

RRP-A (Consumer Services)

PRBs 0-149 • Serves eMBB slices (Mass Market + IMS)

RRP-B (Dedicated Industrial)

PRBs 150-269 • Guaranteed URLLC resources

UE (Device)

SLICE 1 Mass Market (eMBB)

S-NSSAI: SST=1, SD=0x000001

PDU Session 1

DNN:

internet

QoS Flows (within this session)

5QI=9

Web, Email, Chat Best Effort

5QI=8

Video Streaming Buffered Streaming

SLICE 2 IMS Services (eMBB)

S-NSSAI: SST=1, SD=0x000002

PDU Session 2

DNN:

ims

QoS Flows (within this session)

5QI=1

VoNR (Conversational Voice) GBR, 100ms latency

5QI=5

IMS Signaling Non-GBR, Priority

SLICE 3 Vertical Industry (URLLC)

S-NSSAI: SST=2, SD=0x000010

PDU Session 3

DNN:

factory.local

QoS Flows (within this session)

5QI=82

Process Automation GBR, 10ms latency

5QI=83

Remote Control GBR, 10ms latency

PDU Session 4

DNN:

monitoring

QoS Flows (within this session)

5QI=9

Monitoring Data Best Effort

🌐

DN: Internet

Public Internet

📞

DN: IMS

Voice Services

🏭

DN: Enterprise

Private Network

📡 RRP

Radio Resource Partition — A dedicated chunk of radio spectrum (measured in PRBs - Physical Resource Blocks). Each RRP reserves a portion of the carrier bandwidth. One RRP can serve multiple S-NSSAIs, enabling efficient spectrum sharing while guaranteeing isolation.

🔖 S-NSSAI

Single Network Slice Selection Assistance Info — Identifies a network slice via SST (Slice/Service Type) + optional SD (Slice Differentiator). Each slice provides isolated E2E resources.

⚡ 5QI

5G QoS Identifier — Defines QoS characteristics: latency, packet loss, priority. Each QoS Flow within a PDU Session has a 5QI. Values 1-127 are standardized.

🎯 DNN

Data Network Name — Identifies the destination data network (like APN in LTE). Examples: internet, ims, enterprise.vpn. Bound to PDU Sessions.

5G SA: Resource & Service Architecture

📡 RRP

🔖 S-NSSAI

⚡ 5QI

🎯 DNN

📊 Need 5QI Reference Details?

Hierarchical Relationship (1 RRP → N S-NSSAIs)