Convergence of Policy based Resource Management Framework in Next Generation Networks Dong Sun Bell Laboratories, Alcatel-Lucent
Agenda � Challenges � Review of current works � Converged model � Summary 2
Challenges � The Internet “pipe” provided by SPs does not seem to be providing enough revenue growth and is increasingly perceived to be a commodity business � The very same Internet pipes also enable competitors to support services as “best-effort” IP flows – Examples: “parasitic” VoIP, video telephony, gaming, video streaming, web portals, etc. � Demanding applications such as IPTV and VoD need finer granularity (per user/app) of resource control � Uniform resource management across diversity of applications (IPTV, VoIP, VoD) and transport types (xDSL, PON, Ethernet, MPLS, IP ..) Current “pipe” model and QoS mechanisms are inadequate to support emerging multimedia applications and business model 3
Service and Revenue Opportunity � Provide personalized service packages based on – Date rate (bps), – time of day, – QoS, – Service type (SDTV or HDTV) – Capacity consumption (bytes per month) � Support occasional in time services, e.g. – Temporary service upgrade such as higher bandwidth for limited time such as “turbo button” for web browsing/downloading � Improve revenue growth – QoS Differentiation of SP provided services and parasitic provider’s services – Usage/capacity Monitoring – Usage limiting for abusive applications Service aware resource management capability is crucial for SPs to succeed in revenue growth and service differentiation 4
Unifying Resource Management … Unified AS TFS Application Unified … CSCF MGCF Service & MRCF Call Control Transport Adaptation, Policy Policy ? PCRF Resource Repository Server Management UMTS/CDMA/WiMAx Ethernet Cable DSL & Policy Control ??? CMTS GGSN GGSN BRAS PDSN/HA PDSN/HA Router Router Cable Cable DSLAM Access Access WLAN WLAN SGSN SGSN DSL/ATM GW GW DSL/ATM CDMA CDMA Modem Access Access RAN RAN UTRAN UTRAN Modem WiFi Access Points Unified resource management in support of Fixed Mobile Convergence is desirable Unified resource and admission in support of fixed mobile convergence is desirable 5
ETSI TISPAN Resource and Admission Control Subsystem (RACS) AF AF Gq’ RACS SPDF SPDF NASS NASS e4 Rq I1 Ia A- -RACF RACF A Ra Re RCEF RCEF BGF BGF Access Access Di Ds L2T L2T CPE CPE Node Node Point Point Core Border Node IP Edge Transport Transport Layer AF - Application Function SPDF - Service Policy Decision Function NASS - Network Access Attachment Functions A-RACF – Access Resource and Admission Control Function L2T - Layer 2 Termination RCEF – Resource Control Enforcement Function CPE - Customer Premise Equipment BGF - Border Gateway Function 6
3GPP PCC Architecture Subscription Profile AF Repository AF (SPR) Rx Gq AF Online Charging System (OCS) Policy and Charging Sp PDF Rules Function CAMEL Service Data Flow PDF SCP Based Credit Control Gx Go Go PCEF Gy PEF PEF GW GGSN GGSN Gz Offline Charging R5 System R6 R7 (OFCS) 7
3GPP2 SBBC Architecture (Rev. B) Application Function (e.g., CSCF, AS, etc.) Application Function Tx (e.g., CSCF, AS, etc.) Home Policy and Charging Rules Function Tx CRF PDF Policy and Charging Rules Function Home Network Ty Serving Network CRF PDP Proxy Policy and Charging Rules Function Ty CRF PDF Proxy Proxy Ty TPF PEP TPF PEP Access Gateway (AGW) Access Gateway (AGW) 8
Broadband Access PacketCable Multimedia DSL PacketCable 1.x CMS Application (Gate (Gate Manager Controller) Policy Controller) Regional COPS Repository Broadband Policy Policy Networks Server Server Managed IP LDAP Network BRAS BRAS Managed IP Network COPS CMTS CMTS Access COPS Network CMTS CMTS Access Cable Access Node Network Cable Access (DSLAM) Network Cable NCS Modem RG RG Cable E-MTA Modem Application signaling (e.g. S-MTA Analog SIP) Phone Primary Line 9
RACF in Next Generation Networks Applications Service Stratum Application Support Functions and Service Support Functions Application Functions Service S. User Other NGN Service Control Profile Components Functions Functions PSTN / ISDN Emulation Service Component Other Networks Other Networks IP Multimedia Component IP Multimedia &PSTN/ISDN Simulation Service Component GW GW GW GW Legacy Terminals Network Access Network Attachment Resource and Admission T. User T. User User User Control Functions Control Functions GW GW GW GW Profile Profile Profile Profile Attachment Functions Legacy (NACF) (RACF) Functions Functions Functions Functions Terminals Customer Networks Core Transport Access Network Core transport Access Transport Access Transport Functions Functions Functions Functions Edge Functions NGN Functions Terminals Transport Stratum End-User Functions Note: Gateway (GW) may exist in either Transport Stratum * or End-User Functions. Resource and Admission Control Functions (RACF) serves as an intermediary between NGN services and transport networks and makes them work independently 10
RACF’s Job Services Components (e.g. IMS, Video, Web) Resource and Admission Control Functions (RACF) 802.xx Cable Access Core Core Transport Transport 2G/3G DSL Wireless � Dynamic management of a variety of resources (e.g., bandwidth or IP addresses) across varied transport networks—different technologies, administrative domains, ownerships—to achieve end-to-end QoS and provide border control � Service independent mechanism for transport resource management common to various applications (e.g., IMS, IPTV and web based service etc.) – Admission control for managing network congestion – Policy-based arbitration of many-to-many relationship RACF provides an end-to-end solution in support of policy based resource management 11
Target IMS Architecture Web Portal Web Portal IMS (and applications) IMS (and applications) Application interacts with a variety of interacts with a variety of Layer Parlay Parlay Web Web SIP SIP access and core access and core Application Services Application Application Services Application transport networks via transport networks via RACF for e2e resource RACF for e2e resource Parlay Gateway (OSA Parlay Gateway ( OSA SCS SCS) ) management and QoS management and QoS control control Session Control CSCF CSCF Layer IBCF IBCF p p- -CSCF CSCF RACF RACF MGCF MGCF 802 xx PSTN Access IP/MPLS Core Mobile DSL MGCF MGCF Network Packet FTTP/C Circuit Frame, ATM Ethernet Cable Enterprise VPN 12
ITU-T RACF Architecture � Within the NGN architecture, the RACF acts as the arbitrator for Service Control Functions (SCF) resource authorization and Functions in other NGNs allocation between Service Control Functions and Transport Service Stratum Functions. Transport Stratum Rs Rd � PD-FE/PE-FE covers the decision Ri Ru NACF PD PD- -FE FE Rt and allocation of transport Rp resources based on user/network TRC- -FE FE TRC RACF RACF policies such as time of day, priority, etc., Rn Rc Rw � TRC-FE covers admission/traffic control, within access and core PE- -FE FE TRE TRE- -FE FE PE transport, based on resource availability and QoS requirements Transport Functions service-based, PD-FE － Policy Decision Functional Entity transport technology independent TRC-FE － Transport Resource Control Functional Entity service-unaware, transport-technology dependent, PE-FE － Policy Enforcement Functional Entity network-segment specific TRE-FE － Transport Resource Enforcement Functional Entity NACF － Network Attachment Control Functions RACF isolates specific attributes of services and transport networks 13
RACF Highlights � RACF provides Transport Resource Management Capabilities – Application-driven (network-independent) “real-time” control – Management of transport resources within networks (access or core) and at network boundaries – Policy-based authorization and allocation of the resources supporting • End-user equipment of varying QoS control capabilities • Push and pull models for policy control • Multiple transaction models for resource authorization, reservation and commitment • A combination of resource management methods based on accounting, measurement and reservation � RACF interfaces to Service Control Function (e.g. SIP Proxy Server or IMS) to allow an Application to request resources including: – QoS (BW Guarantees, per flow traffic shaping/policing, priority, …) – NAPT control and NAT Transversal capabilities – Gate control and other border control functions � RACF can interface across network boundaries to support a variety of business models – Addresses Session Border Control Issues – Will integrate flow based charging capabilities (future) RACF covers end-to-end QoS control as well as border control functions 14
Recommend
More recommend
