RACF Considerations in CJK NGN Test-Bed Youngwook Cha, Taesang Choi, Youhyeon Jeong

2/18 Introduction Phase III of CJK NGN Test-Bed RACF Reference Points Resource Control Modes & Schemes Messages and Protocols for Phase III Next Step Contents

3/18 Introduction CJK NGN test-bed plan was approved at 6 th CJK NGN WG meeting ( , Hangzhou, China). Three Phases toward CJK NGN test-bed –Phase I: rd /4 th Quarter, Scenario 1(Single Call Server within a single NGN Network Domain without PSTN) –Phase II: st /2 nd Quarter, Scenario 2~4(Call Servers across multiple NGN Network Domains with PSTN) –Phase III: rd /4 th ~ st /2 nd Quarter, Scenario 5~7(Media and Application Servers + RACF) This contribution is prepared to discuss functions, reference points and messages of RACF in the CJK NGN test-bed of phase III.

4/18 CJK NGN Test-Bed Schedule Phase III: rd /4 th ~ st /2 nd Quarter, Scenario 5~7(Media and Application Servers + RACF)

5/18 RACF Considerations RACF Reference Points Resource Control Modes –Push Mode, Pull Mode Resource Control Schemes –Single-Phase Scheme, Two-Phase Scheme, Thee- Phase Scheme Information exchanged over each Reference Point Protocols for each Reference Point

6/18 Generic RACF Functional Architecture Which Reference Points for Phase III? – Rs and Rw Reference Points for Phase III-1, rd /4 th Quarter – Rt and Rc Reference Points for Phase III-2, st /2 nd Quarter RACF: Resource and Admission Control Functions PD-FE: Policy Decision Functional Entity TRC-FE: Transport Resource Control Functional Entity TRE-FE: Transport Resource Enforcement Functional Entity PE-FE: Policy Enforcement Functional Entity

7/18 QoS Capability of CPE Type 1 – CPE without QoS negotiation capability (e.g., vanilla soft phone, gaming consoles) Type 2 – CPE with QoS negotiation capability at the service stratum (e.g. SIP phone with SDP /SIP QoS extensions) –The CPE is unaware of QoS attributes specific to the transport. Type 3 – CPE with QoS negotiation capability at the transport stratum (e.g. UMTS UE) –The CPE supports RSVP-like or other transport signaling (e.g. GPRS session management signaling, ATM PNNI/Q.931). What kind of CPE will be used in the CJK NGN test-bed? – Type 2 CPE may be an answer if we consider SIP phone.

8/18 Resource Control Mode (1) Push Mode: –The RACF makes the authorization and resource control decision based on policy rules and autonomously instructs the transport functions to enforce the policy decision. –The push mode is suitable for type 1 and type 2 CPEs. Authorization, Reservation, Commitment Reservation, Commitment SIP Invite

9/18 Resource Control Mode (2) Pull Mode: –The RACF makes the authorization decision based on policy rules and, upon the request of the transport functions, re-authorizes the resource request and responds with the final policy decision for enforcement. –The pull mode is suitable for type 3 CPE. Which mode will be used in the CJK NGN test-bed? – Resource control mode is dependent on the type of CPE. – For type 2 CPE, the push mode is suitable. Authorization Reservation, Commitment SIP Invite RSVP

10/18 Resource Control States and Schemes QoS Resource Control States –Authorization, Reservation, Commitment QoS Resource Control Schemes –Single-Phase Scheme : Authorization, reservation and commitment are performed in a single step. –Two-Phase Scheme : Authorization and reservation are performed in one step, followed by commitment in another step. Alternatively authorization is performed in one step, followed by reservation and commitment in another step. –Three-Phase Scheme: Authorization, reservation and commitment are performed sequentially.

11/18 Resource Control Modes and Schemes Push Mode Rs Authorization + Reservation + Commitment Commitment after Authorization + Reservation Rw Reservation + Commitment Commitment after Reservation Pull Mode Rs Authorization Rw Reservation + Commitment Commitment after Reservation Which control scheme? – Single-phase scheme is suitable for client-server-like applications to minimize the delay between the service request and the ensuring reception of content. – Three-phase scheme is suitable for network-hosted services in an environment where transport resources are scarce.

12/18 Resource Control using Single-Phase Scheme in Rs and Rw Authorization, Reservation, Commitment Reservation, Commitment

13/18 Resource Release

14/18 Information exchanged over each Reference Point RIR : Resource Initiation Request/ResponseRMR : Resource Modification Request/Response RAR : Resource Action Request/ResponseRN : Resource Notification RRR : Resource Release Request/ResponseARR : Abort Resource Request/Response RDR : Resource Decision Request/ResponseTRIR : Transport Resource Information Request/Response TRII : Transport Resource Information IndicationTRRN : Transport Resource Release Notification RRJ : Resource Request reJectionRUI : Resource Unavailable Indication

15/18 RACF Messages for Phase III Which messages will be exchanged over each reference point? – RIR and RRR are basic messages. – Other messages will be further exchanged according to the agreement of RACF functional scope.

16/18 Protocols for each Reference Point(1) Q.rcp.XProtocol BaseRef. Point Q.rcp.1DIAMETERRs Q.rcp.2 Part IRCIPRp Q.rcp.3.1COPSRw Q.rcp.3.2H.248 Q.rcp.XProtocol BaseRef. Point Q.rcp.4.1COPSRc Q.rcp.4.2SNMP Q.rcp.5To be determinedRt Q.rcp.6To be determinedRd Which protocol will be implemented for each reference point? –There are one more protocols for some reference points. –What will be criteria to select a specific protocol for those reference points?

17/18 Protocols for each Reference Point(2) TRC-FE collects the transport network topology and the transport resource status information via Rc reference point. Accepting various demands and requirements, SG 11 will generate several protocols for this reference point. How these protocols will be consistent with each other in a point of information semantics? Standardization direction: –1 st step : Requirements from SG 13 –2 nd step : Protocol Neutral Information Model in SG 11 –3 rd step : Protocol Dependent Data Models in SG 11 Information Model Requirement Data Model XML Schema UML Class Diagram MIBPIBOther.. Q.rcp.4.0Information Model for Rc Q.rcp.4.1COPS alternative Q.rcp.4.2SNMP alternative Q.rcp.4.3Web Services alternative ……

18/18 Next Steps Discussion of RACF functional scope for each reference point Positioning and mapping each functional entity into a physical entity –Concrete QoS resource information elements for each message RACF test cases