3GPP SA5 Policy Management Cases

IDMS, SON, NFV

ENI Technology Workshop on Policy Management

2020-09

Lingli Deng, Jiachen Zhang, Chen Wang (China Mobile)Haocheng Wang (BUPT)

Content

➢ IDMS: Intent Driven Management Service

➢ SON Policy and Coordination

➢NFV Policy Management

➢ Summary

IDMS：Intent Driven Management Service

IDM Service

Consumer

IDM Service

Producer

Network Infrastructure

（Physical and Virtual）

Intent from the consumer

Translate intent to

network deployment

information

Deploy the network

Continue network state

monitoring to meet the

intent

Communication

Service Customer

Communication

Service Provider

Network Operator

Virtual Infrastructure

Service Provider

Data Center Service

Provider

Network Equipment Provider

（incl. VNF Supplier）

NFVI Supplier

Hardware Supplier

End user,Small&Medium

Entreprise,Large Entreprise,

Vertical, other CSC etc.

Intent-NOP

Intent-CSC

Intent-CSP

Client

Client

Client

Client

Client

Client

Client

Provider

Provider

Provider

Provider

Provider

Provider

Provider

Intent Driven Management Service The scenarios for utilization of intent

Intent Expression

Description:

<IntentDrivenAction>,<IntentDrivenObject>

IntentDrivenObject（IDO）：

<IntentDrivenObjectName>{<IntentDrivenObjectProperities>}

IntentDrivenAction（IDA）：

<IntentDrivenActionName>{<IntentDrivenActionProperities>}

Relation between intent driven MnS and SON:

MnS Producer can translate the intent into SON target information or use the information in intent for

SON target directly.

IDMS for SON--Intent Driven Area Load Balance

Scenario description: Operator wants the selected

area to be balanced to ensure sufficient traffic capacity

for new UE(s) to access.

Intent expression:

Intent：AreaLoad balance

IntentDrivenAction：LoadBalance

IntentDrivenObject：AreaInfo

Execution steps：

• Identity the cell type;

• configures all corresponding SON Control Function

IOC instance;

• Decide corresponding SON target IOC;

• Analyze and configure the SON coordination

policies IOC;

• Do other analysis and management tasks;

• Evaluate the effect and repeat to ensure fulfilment.

IDMS for NFV---Intent driven NF capacity changing

Intent Expression：

Intent：NF capacity changing

IntentDrivenAction：CapacityChange

IntentDrivenObject：NFInfo

Execution step：

• Translate the received intent to the detailed

modification requirements;

• Configurate parameters for corresponding MOI(s);

• Allocate virtualized infrastructure resource(s) for

VNFs if any;

• Adjust physical infrastructure resource(s);

• Modify corresponding NF instance.

Scenario description: The operator wants to

change the capacity of an existing NF instance，for

example, expand capacity of an existing NF instance to

support additional certain number of UE(s).

Content

➢ IDMS: Intent Driven Management Service

➢ SON Policy and Coordination

➢NFV Policy Management

➢ Summary

SON Optimization Policy

1. The SON functionality keeps monitoring input dataaccording to the operator’s objectives and targets.

2. Whenever the objectives and targets are not met,optimization algorithms will be triggered.

3. Corrective actions are provided and executed.

4. Evaluating the result of the executed correctiveactions.

a. If the system status is not satisfactory, fallbackmay be needed to recover the systemconfiguration as the original state.

b. If the system status is satisfactory, the onetime optimization ends.

c. Return the input data to monitoring.

[1] TS 28.627

Fig 1. SON policy procedure[1]

Why SON Coordination？

Some SON functions will affect the common network parameters / States directly or indirectly,therefore, there may be conflicts or dependencies between the son functions.

The SCF (son coordination function) is introduced to do SON coordination.

Fig 2. Mesh relationship between SON functions and network parameters[2]

[2] TS 32.522

CCO: Capacity and Coverage Optimization

COC: Cell Outage Compensation

ES: Energy Saving

HOO: HandOver parameter Optimization

LBO: Load Balancing Optimization

RF: Radio Frequency

RRM: Radio Resource Management

SON Coordination Methods

A. Based on priority of SON functions

1. The impact area information should be known by the SCF.

2. By comparing the priorities of SON functions, SCF will decide to do the highest-priority action and

suspend the low-priority actions.

3. After the highest-priority SON function executed, the SCF is informed about the result

(successful/unsuccessful, parameters changes) of the action.

4. SCF will analyze the latest network situation to decide how to deal with the suspended low-priority

SON, for example, resuming or rejecting.

B. Based on the cell state

According to different type of conflicts, the SCF should check the state of involved cells and operate

on the conflicting SON functions based on the different cell states (allow/disallow).

C. Coordinating based on cell state and the priority of SON functions jointly

Cell State Based SON Coordination Example

[3] TS 28.628

Aoutage

B

Cenergy saving

ESM

compensateCOC

compensate

Fig 3. the conflict of COC and ESM

SON coordination procedure[3]

1. COC requests cell B to compensate the coverage of

cell A.

2. COC requests SCF check the state of cell B.

3. SCF should check whether cell B is compensating an

energy saving cell

a. If so, SCF should check whether cell B can

compensate both cell A and cell C concurrently.

b. If not, the SCF may disallow cell B to compensate

an energy saving cell.

Content

➢ IDMS: Intent Driven Management Service

➢ SON Policy and Coordination

➢NFV Policy Management

➢ Summary

3GPP Policy Management introduction

✓ TS28.331 (published):

⚫ focuses on 4G scenarios;

⚫ offers one high-level use case: deploying the SBC from IMS and

P-GW from EPC in the same Data Centre

⚫ defines PAF(same to PAP in NFV) and PF(same to PF in NFV);

IRP manager is PAF, IRP agent is PF

⚫ focuses on NM acting as PAF, EM acting as PF, interfaces and

policy related operations

✓ TS28.555/556 (new):

⚫ focuses on 5G scenarios;

⚫ offers 3 high-lever but similar use cases: deploying IMS network

functions in centralized or edge DCs; different DC; a same DC

⚫ uses PAF and PF; MnS provider is PAP, MnS consumer is PF

⚫ Just started, more details to be filled

NFV Orchestrator

(NFVO)

VNF Manager(VNFM)

Virtualised Infrastructure

Manager(VIM)

VNF

NFV-MANO

VNF

NFVI

Os-Ma-nfvo

Ve-Vnfm-em

Ve-Vnfm-vnf

Nf-Vi

EM

EM (PF)

NM (PAF)

Itf-N(add new policy interface)

3GPP management system

Itf-N(add new policy interface)

➢ As shown in right figure, 3GPP also focus on policy management. There are three main TSs focusing

on policy management, driven by policy conflict detection and resolution.

3GPP Policy Management introduction

➢ Right figure is the 4G version class diagram

➢ Similarities and differences:

✓ Specification level requirements are similar, 5G

version creates two requirements on policy execution

✓ Both have requirements on conflict detection and

resolution

✓ Both use PAF and PF roles

⚫ TS28.555/556 plans to define policy information

model and solutions which are not defined in

TS28.331.

⚫ In 4G version, IRP manager acts as PAF, IRP agent

acts as PF; while in 5G version, MnS consumer acts

as PAF, MnS provider acts as PF

More details will be confirmed with the progress of

TS28.555/556 which will be published in March and

June respectively

PolicyListpolicyId

policyPrioritypolicyStatuspolicyType

policyContent

PolicypolicyListIdpolicyIdList

PolicyManagementIRPpolicyConflictNotification

ManagedGenericIRPpolicyConflictNotification

PolicyManagementIRPoperationsCreatePolicy()DeletePolicy()UpdatePolicy()QueryPolicy()

ActivatePolicy()DeactiviatePolicy()

listPolicys()

PolicyManagementIRPNotificaitonspolicyConflictNotification()

Content

➢ IDMS: Intent Driven Management Service

➢ SON Policy and Coordination

➢NFV Policy Management

➢ Summary

Summary of ENI Mapping

➢ IDMS: intent policy & policy continuum

➢ SON Policy Coordination: intent policy & conflict avoidance

➢NFV Policy Management: intent/imperative policy & conflict resolution

➢ Future Work Proposals

Add contribution to ENI Mapping WID

Consider support intent/imperative policy models for various cases in stage 2

Identify ENI Assistance mode and align in interworking interfaces in stage3

THANK You

denglingli@chinamobile.com