Resource and Admission Control for NGN

Transcription

1 Internatinal Telecmmunicatin Unin Resurce and Admissin Cntrl fr NGN Hui-Lan Lu, Ph.D. Q.4/13 Rapprteur Bell Labs, Lucent Technlgies Geneva, June 2006

2 802.xx Access xdsl Dmain 1 IntServ Why? N G N Dmain 2 DiffServ Dmain 3 MPLS-TE Dmain 4 Over-Prv Multi-Service Packet Transprt Cable 2G/3G Wireless Flawless supprt fr a variety f applicatins (e.g., Web services, VIP and IPTV) with very different perfrmance needs Enabling prviders t cntrl end user experience in a hetergeneus envirnment while prtecting the netwrks Allwing fast intrductin f perfrmance-demanding applicatins Geneva, June

3 Basic Netwrk Requirements Ensure that nly legitimate requests are satisfied Allcate and de-allcate resurces (e.g., IP addresses, prt numbers, bandwidth) based n established plicy Hide the netwrk tplgy (e.g., IP addresses f all but a few entities) as necessary Be able t handle remte NAPT devices Mitigate relevant denial-f-service attacks Real-time applicatin-driven resurce management that Preserves the separatin f services and transprt Prvides the necessary cupling t guarantee QS and implement security measures dynamically Geneva, June

4 Brief Histry + Building Blcks 1997: IETF has cmpleted the Resurce Reservatin Setup Prtcl (RSVP) a generally nn-scalable per-flw end-t-end mechanism, which has fund a 2nd life in Multi-Prtcl Label Switching (MPLS) : IETF has develped the Differentiated Services (DiffServ) mdel, which supprts traffic aggregatin, and applied it t MPLS : IETF has develped the Cmmn Open Plicy Service (COPS) prtcl t exchange plicy infrmatin between a plicy server (Plicy Decisin Pint [PDP]) and its clients (Plicy Enfrcement Pints [PEPs]) But ther prtcls (ntably, RADIUS, DIAMETER, and H.248) have evlved t be used fr the same purpse 2000-present: 3GPP has adpted the IETF building blcks fr Service- Based Lcal Plicy (SBLP), which is evlving int Plicy and Charging Cntrl. 3GPP2 has a similar effrt n Service-Based Bearer Cntrl present: ETSI TISPAN has been develping the Resurce and Admissin Cntrl SubSystem (RACS) based n SBLP 2004-present: Q.4/13 has been develping RACF, with an end-tend scpe frm the nset, based n SBLP Geneva, June

5 RACF and NGN Framewrk Architecture 3 rd Party Applicatins ANI Cntrl Media Management Management End-User Service User Prfiles Service stratum Transprt User Prfiles Applicatin/Service Netwrk Attachment Cntrl Service Cntrl Transprt Cntrl Resurce & Admissin Cntrl Other Netwrks Transprt UNI NNI Transprt stratum See T Y.NGN-FRA Geneva, June

6 RACF Architecture (See T Y.RACF) Service Stratum Service Cntrl (part f IMS r ther) Transprt Stratum Netwrk Attachment Cntrl intradmain Ru Rn Rp TRC-FE Rc Rd Rt Rs PD-FE RACF Ri Other NGNs interdmain TRE-FE Transprt Plicy Decisin Functinal Entity (PD-FE) Authrizes resurce requests Cnfigures the transprt t enfrce plicy Transprt Resurce Cntrl Functinal Entity Tracks resurce usage & netwrk tplgy Prvides resurce infrmatin t PD-FE Plicy Enfrcement Functinal Entity () Enfrces plicy fr NAPT, gating, path selectin, rate limiting, packet marking, etc. service facing, transprt independent typically part f brder transprt elements (e.g., S/BCs, edge ruter) service independent, transprt dependent, segment specific Geneva, June

7 Mre RACF Specifics Supprt fr Relative and abslute QS, including pririty Endpints f varied QS cntrl capabilities Push and pull mdels fr plicy installatin Multiple transactin mdels fr resurce requests Varius resurce management methds based n accunting, measurement and reservatin Existing and emerging transprt QS mechanisms Geneva, June

8 Push and Pull Mdels Service Cntrl Service Cntrl 2 3 Tken T RACF 1 6 RACF T 6 7 Plicy Plicy 3 4 User Equipment 5 T 8 Transprt User Equipment Transprt Pull Mdel Push Mdel Applicatin Signaling RACF Cntrl Transprt QS Signaling Geneva, June

9 Illustrative QS Request Prcedure PD-FE TRC-FE SCF 1. Trigger 3. Plicy decisin 2. Resurce initiatin request 5. Final admissin decisin (reservatin and/r cmmit) 4. Resurce initiatin request/respnse (availability check) 6. Resurce initiatin request (reservatin and/r cmmit) Resurce cntrl sessin ID Transprt subscriber ID Media flw descriptin Media pririty Media applicatin class f service Resurce initiatin respnse Resurce cntrl sessin ID Transprt subscriber ID Media flw descriptin Traffic descriptr IP QS handling class Resurce initiatin respnse Geneva, June

10 Cnfiguratin Example I Service Cntrl Service Cntrl Service Cntrl Rs Rs Netwrk Attachment Cntrl Ru TRC-FE PD-FE Rt Ri PD-FE Rp Rt TRC-FE Ri PD-FE TRC-FE Rt Ru Netwrk Attachment Cntrl Rc Rc Rc Custmer Premises Equipment /Netwrk Access Netwrk Cre Netwrk Access Netwrk Custmer Premises Equipmen t/netwrk The can reside in the Sessin Brder Cntrller Access Nde Brder Gateway Cable Mdem Terminatin System Gateway GPRS Supprt Nde Packet Data Serving Nde Geneva, June

11 Cnfiguratin Example II Service Cntrl Service Cntrl Rs Rs Netwrk Attachment Cntrl Ru TRC-FE PD-FE Rt PD-FE TRC-FE Rt Ru Netwrk Attachment Cntrl Rc Rc Custmer Premises Equipment /Netwrk Access Netwrk Cre Netwrk Access Netwrk Custmer Premises Equipmen t/netwrk Cre Netwrk is ver prvisined RACF is deplyed per netwrk segment as needed Geneva, June

12 Use Case: Link-Based Resurce Management CSCF PDF CSCF CSCF- Call Sessin Cntrl Functin TRCF Enterprise Netwrk Edge Ruter () MPLS/DiffServ Netwrk Edge Ruter () Enterprise Netwrk Sftclient IP Phne MPLS Path Cre Ruter Sftclient IP Phne LSPs are set up a priri fr ruting the traffic f a specific applicatin DiffServ is used fr effecting the desired treatment f traffic RACF Measures link utilizatin per service class peridically Frmulates blcking plicy upn link cngestin fr affected paths Makes admissin decisin per plicy Cnfigures edge ruters fr the admitted traffic Geneva, June

13 Summary Bridging service cntrl and transprt, RACF enables dynamic applicatin-driven resurce management Applicatin admissin decisin taking int accunt resurce availability Preempting transprt cngestin frm the service cntrl layer Augmenting native transprt QS supprt, RACF can be applied edge-t-edge r end-t-end, and be realized in varius ways All netwrk-cntrlled applicatins can make use f RACF fr perfrmance assurance and netwrk brder cntrl The initial Recmmendatin n RACF (Y.RACF) is targeted fr cnsent in July Selectin and develpment f RACF prtcls is nging Next steps are t address pen issues such as inter-pdf cmmunicatin (intra- and inter-prvider) and crdinatin f transactins end-t-end Draft Recmmendatins Y.123.qs and Y.enet under develpment apply RACF t specific Ethernet envirnments Cperatin amng related standards effrts acrss SDOs is essential fr achieving a cnsistent apprach Geneva, June

14 List f Acrnyms CSCF: Call Sessin Cntrl Functin GPRS: General Packet Radi Service IMS: IP Multimedia Subsystem LSP: Label Switched Path NAPT: Netwrk Address and Prt Translatin NGN: Next Generatin Netwrks PD-FE: Plicy Decisin Functinal Entity : Plicy Enfrcement Functinal Entity RACF: Resurce and Admissin Cntrl RSVP: Resurce ReserVatin setup Prtcl S/BC: Sessin Brder Cntrller SDO: Standard Develpment Organizatin TRC-FE: Transprt Resurce Cntrl Functinal Entity TRE-FE: Transprt Resurce Enfrcement Functinal Entity Geneva, June