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Policy control for packetcore networks

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Policy control for packetcore networks

  1. 1. Whitepaper Elitecore Technologies Telecom Practices Policy control for
  2. 2. Whitepaper Policy control for Packetcore NetworksINTRODUCTIONThe world pushing in overdriveCommunication Service Providers (CSPs) are busy riding the avalanche of unprecedented network changes andtechnology arrivals. Even at this juncture, a phenomenon that is growing faster than everything else is the ‘insatiableconsumer’. The telecommunications industry in recent years has witnessed a systematic upheaval in communicationstechnologies. With rapidly maturing technologies and protocols, demand for higher-level applications and services viaIP driven access and bandwidth is also growing rapidly .This transformation has given rise to a multitude of new trends such as intensified subscription to life-style and businessoriented communications services by consumers and enterprise users. Demand for high speed, data-heavy and contentrich mobile connectivity capable of providing continuous information stream has emerged as a new paradigm. Thisorganized rally of ‘personalized services’ oriented network platform eventually arrived at a quintessential phase withthe advent of packetcore networks. Source: Chetan Sharma Consulting3G, for example, promises to alleviate many limitations of 2.5G that didnt allow enjoying high-speed internet services.Since it will work well simultaneously for both voice and data, service providers will indeed witness a great surge in SMS,streaming video, music downloads, social media applications and the like. The market is already experiencingphenomenal addiction for high-speed rich media content and social networking enabled smart phones. Nokia Ovi,Apple App Store, Youtube, Facebook, Twitter and many other similar platforms are becoming essential lifestyleingredients for the next-gen users. In order to capitalize these opportunities, service providers need smart yet simplesolutions to introduce Time and Value based innovative service plans. This is where a dynamic Policy Manager willcatalyze a cutting edge in packetcore networks by raising the bar in managing ubiquitous and context aware serviceprovision with real time charging. Gradual Drift from 2G to 3G and evolution Changing Dynamics of the Subscriber Usage Pattern towards Evolved Packet SystemSource: Fraunhofer FOKUS presentation on OpenEPC2 Elitecore Technologies Telecom Practices
  3. 3. Whitepaper Policy control for Packetcore NetworksNEED FOR POLICY AND CHARGING RULES FUNCTIONToday, for Communications Service Providers, successful rollout of high-speed data driven services hinges on fine-grained control of each service. This is an undeniable imperative for stringent network usage management for High-speed Network, since guaranteeing end-to-end Quality-of-Service (QoS) using manual intervention for a variety ofservices appears rather unachievable. Besides, rapidly declining price per bandwidth due to intense competition andcontinued trend of data access being commoditized has also added extra pressure. Service providers therefore have tocontrol, monetize, and adapt their infrastructure suitably for fine-tuning their network economics, while also satisfyingtodays demanding customers. Arriving at this involvesmanifold service levels, real-time charging and quota Top Data Applications used by smart-phone usersmanagement, real-time service provisioning, seamlessexperience over various devices, on-demand & location-specific applications and right-enabled admission with (minutes/month/user) Avg. monthly facetimesteady access control.This is where the role of PCRF (Policy Charging and RulesFunction) comes. With the help of PCRF, Service Providerscan implement a policy-driven mechanism for automatinguser self-provisioning. Accordingly, they can engage moreeffectively with subscribers, sustain real-time control,charge suitably and maximize their returns by centralizingnetwork policy control by building a smart conduit between Source – Zokemthe OSS (network processes) and BSS (business processes). An exemplary sample from the USA, UK, nordic countries.EXTRACTING THE GENESIS OF PCRFSimple and cost-effective ways for catering and managing Quality of Service (QoS) are important for packetcoreoperators. This is essentially important for operators aiming at providing a gamut of IP-based rich content services acrossover mobile broadband channels. This is where Policy based network management Architecture was evolved with IETFand 3GPP for IMS policy frameworks.PCRF has evolved out of the 3GPP (third generation partnership product) as a component for IMS, an architecturalframework for delivering multimedia services using Internet Protocol (IP), a common transport protocol that allows foraccess independence and enables a single-core multimedia network. PCRF as of today is no longer tied only to IMSnetworks, but is applicable across many network types.Notwithstanding its original release as part of the 3GPP IMS standardization move to dynamically authorize and tie IMSsessions with mobile packet access resources, today policy plays a key role in the working of an IMS, 3G and otherevolving next generation networks. PCRF now essentially covers the business and technological rules / definitions thatadminister which network services a subscriber can access, at what bandwidth level, when, and for how long. The policycontrol thus queries, coordinates, and adjusts all of the network resources to grant the required services to individual,authorized subscribers.PERTINENCE TO 3GPP RELEASES AND EVOLUTION OF POLICY CONTROL FRAMEWORKWith a view to fortifying the future of CSPs in the highly evolving heterogonous networks, 3GPP has been introducing aseries of guidelines known as releases. Of these releases, 3GPP release 7 is where PCRF formally replaced the erstwhilePolicy Decision Function (PDF), a secondary mechanism that used to provide static policy controls and lacked unification.Realizing the growing complexity in next-gen networks, Release 7 aimed at centralizing subscriber management policycontrol. The move helped telecom carriers break new ground by empowering them with new capabilities in centralizedsubscriber policy management, for delivering broadband services with high data rate and lower-latency. With this, the3 Elitecore Technologies Telecom Practices
  4. 4. Whitepaper Policy control for Packetcore Networksnext generation policy system imbibed hitherto unavailable features such as additional policy rules and real-time eventtriggers. Aided by this improved scalability, PCRF came to support a much higher level of TPS & tiered services, volumequotas, premium content and other next generation telecom offerings.Diameter was first introduced by 3GPP in Release 5 for the IP Multimedia Subsystem (IMS). In the beginning Diameterwas used along side other control protocols such as COPS and SOAP, but in 3GPP Releases 6 and 7 Diameter receivedprime responsibility for control plane signaling and in the LTE related 3GPP Release 8 and 9 it continued widespread ascontinued to more interfaces and network functionalities. 3GPP Release 8 also brought many advanced capabilitiessuch as the first step towards Long Term Evolution (LTE).The release introduced an array of components for 3GPP Wireless Networks Reference ArchitectureEvolved Packet Core (EPC) including SGW (ServingGateway), PGW (PDN Gateway) and MME (Mobile ApplicationManagement Entity). As per Rel 8 guidelines, PCRFs Functioninteroperation with the EPC gateways and the MME SPRbecomes mandatory and essential for the operation Online Chargingof the LTE. Also quite importantly, 3GPP Rel 8 actively Diameter System(OCS)looks at supporting IP based 3GPP services throughvarious non-3GPP access technologies such asWiMAX and WLAN. 3GPP compliant AAA (by Sp Rxinterfacing with HSS) facilitates interworking Gybetween 3GPP and non-3GPP access technologies inEPC. Policy Charging andAlso, a policy peering protocol enabling automated Rules Function (PCRF)control for adaptive flow aggregation between the Offline ChargingPCRF and PCEF allows policy rules to trail subscribers System (OFCS)even when they are roaming, thus ensuringconsistent service quality (QoE) irrespective of Gxx Gxsubscribers geographic location, by peering in real- Gztime with the visited (roaming) networks. In 3GPPrelease 9 further expanded policy enforcement PCEFfunctions of the Gx interface for direct management BBERFof QoS policies based on subscribers usage Gatewayinformation. Thus, also enabling overall datatransmission and/or service level monitoring.Key reference points described in 3GPP Release 7 and 8 Release 7 End-to-end Quality of Service (QoS) concept and architecture Release 7 Policy and charging control architecture Release 7 Added end user subscription differentiation Release 7 Applicable to many access networks Release 8 Policy and charging control signaling flows and Quality of Service (QoS) parameter mapping Release 8 LTE and System Architecture Evolution Release 8 Inter operator roaming and policy control Release 8 Interworking with 3GPP and Non 3GPP access networks4 Elitecore Technologies Telecom Practices
  5. 5. Whitepaper Policy control for Packetcore NetworksWHY SHOULD OPERATORS OPT FOR A PCRFCommunication services are no longer conceived as something services such as streaming video, P2P, BoD, VoIP, etc. becomesneeded to reach another person. They have evolved into a quite effective. In turn as subscribers also get to enjoy the QoShighly influencing and aspirations driven lifestyle & business and freedom of managing, controlling and updating their ownintervention, which touches human lives in many ways, usage preferences, they feel more comfortable and grow loyaleveryday, and every moment. Resultantly, CSPs now seek a with their CSP. This way PCRF also delivers substantial value-special presence among their customers with a view to satisfy addition by enabling personalization to subscribers’ servicesubscribers while ensuring profitable and judicious network usage experience.usage. Optimizing bandwidth utilization, improving QoS,ensuring consistent data roaming control and gaining capability By enabling adequate policy control PCRF safeguards bothto offer & manage long-term tiered bandwidth services customer expectations (QoE) and carrier needs (QoS).together hold the key to business competitiveness. Integration of Network with the OSS has always been a challenge, with PCRF Tactically located between the networkPolicy Manager benefits the operator through real time control and the OSS; it acts as an intelligent conduit of services acrosson network usage, service personalization and subscriber any kind of network or device.management polices. Network policies help ResourceAdmission Control in real time through Monitoring Network Finally, in the light of 3GPP release 8, which adequatelyContention per Class of Service by enforcing bandwidth usage accommodates interest of the service providers that are keencontrols on real time, thereby ensuring QoS. By managing data to offer next-generation services over non-3GPP accesstraffic peaks, the unnecessary cost involved in adding network networks, a PCRF enabling such integration in the case of legacycapacity can be avoided. Application policies help determine infrastructure deserves key attention. As stems from this, arequirements that have to be met in order for it to be delivered smart PCRF is needed that can support such networks whichsuccessfully (e.g. subscriber plan, subscriber location, QoS, comprises of devices that arent fully-compliant with currentbandwidth requirements) It manages bandwidth allocations as industry specifications. Similarly, a PCRF can also be tied to aper service&subscriber profiles. Subscriber policies help create specific vendor or it can be an open platform that allowspersonalized services plans for data services integration and interoperability of equipment from multiple vendors. It also integrates with OCS where PCEF cannot directlyWith a PCRF driven policy management, rolling out tiered talk to the charging systemservice plans while managing volume control for an array ofContemporary policy management and enforcement specifications stress on the following aspects (usecases) for judicious QoS over varied technologies, devices and networks, especially when data (mobile)revenues are burgeoning at an extreme rate and shall soon take over voice revenues the world over.Managing mobile data tsunami and averting traffic Vs non-roaming customers etc. This way using dynamic policy incongestion in network real-time, CSPs can avert possible event of network congestion and maintain healthy network economics together withInternational Telecommunication Union (ITU) in its recent competitive QoS among all broadband data users.survey reveals that by the end of 2010, worldwide mobile userswill reach a titanic population of about 5.3 billion. Add to this Mobile broadband users in emerging markets by access deviceanother study from Cisco, which concerns Global Mobile DataForecast finds that a booming developing market like India will Mobile broadband users in emerging markets (%)have the highest Mobile Data Traffic Growth at a staggeringCAGR of 222% over 2009-2014. This indeed introduces freshchallenges for CSPs in managing mobile (broadband) datatsunami.This is again where dynamic policy manager can offer the muchneeded panacea. By being able to monitor subscribers’ usagepattern in the light of available network resources, CSPs canassign judicious priorities to various parameters such assubscriber profile, service package, application type (music,gaming, video, VoIP) traffic required by partner sites, roaming Source – Ovum5 Elitecore Technologies Telecom Practices
  6. 6. Whitepaper Policy control for Packetcore NetworksDynamic adaptation and Efficient use of resources Tiered service offeringsUnlike traditional ways of configuring static policies, todays As consumption of high-speed mobile data grows, CSPs have topolicy controller must adapt to suitable QoS configurations manage very tactically for a broad yet complex mix of contentbased on monitored network state in real-time for better and mobile data users. While power users are increasing, autilization of network resources. Thus, satisfying both network wide section of causal users still remains. In order to make dataspecific needs i.e. determining available resources (e.g. services more appealing and relevant to both these segments,bandwidth) for enforcing policies as per required Class of CSPs must have smart Policy Management to cater adequateService and service usage specific needs (personalizing service options on usage and pricing. This provides ample opportunitydelivery to a subscriber by based on context-awareness). for revenue maximization while ensuring customization for individual subscriber needs since configuring various serviceFair usage classes based on Bandwidth Usage Caps, Plan Speed, AccessFor enabling end-to-end QoS (fair allocation of broadband Time, Service Priority (whether the subscriber is a casualresources among all users), policy control mechanism should consumer, a business organization or a governmentbe able to invoke fair usage control to avoid network congestion establishment), Application type (e.g., streaming HD video,on account of a small fraction of heavy usage subscribers and VoIP, P2P etc) and Device type (e.g. a 3G smart phone) nowshould reserve network resources evenly among a wide section becomes possible with the help of a dynamic policy manager.of subscribers. Hence, CSPs would have the ability to apply a setof proactive responses to add to their subscribers QoE. Using Enabling Real time Chargingdynamic policy CSPs can proactively measure their subscribers’ With exponential growth in consumption of rich multimediausage and upon them reaching assigned threshold, CSPs can content (data) on variety of devices and also fast changingwield flexible options such as sending alerts, throttling the subscriber usage patterns, CSPs are required to charge theiraccess speed during peak hours, assign priorities to bandwidth subscribers in real-time and also need to shift their accessintensive services. Moreover, with the added goodness of privileges between tiers of service QoS (e.g. bandwidth onParental Controls, subscriber too can restrict or limit abhorrent demand using self-care portal). In similar circumstances, itand bandwidth-guzzling content channels by applying suitable becomes an imperative to integrate dynamic policyconditions such as Time of Day, Bandwidth Quota Management management with online charging systems (OCS). Thisand Anti Spam filters. augments and streamlines management of real-time changes in QoS while catering sporadic subscriber requests which has tremendous implications for service providers revenue and subscribers service experience.IN NUTSHELLThe world of savvy broadband users and uber-cool smart mobile devices is busy swallowing oodles of high-speed rich content anddata. This paradigm, though gradually yet steadily, is heralding the onset of Yottabyte Era*. With the dawn of 3G, managing thequality of service promise eclipses every other aspect of broadband telecom offering. At this juncture, the telecom industry ingeneral and CSPs in particular are revisiting their value-proposition for meaningful sustainability and seamless alignment withrapidly changing subscribers needs. Irrespective of their demographics and psychographics, both ordinary and enterprise userswant to engage in smooth, convenient and anywhere, anytime and any device high-speed data service. Since brand promise inpacketcore networks strictly hinges on service quality reliability (QoS), CSPs in turn are keen to partner accurate answers for theiracute needs as they prepare to deliver attractive offerings and strive to meet on-demand (real-time) service requests. * As articulately defined in the paper “Managing growth and profits in the Yottabyte Era”NETVERTEX: A DYNAMIC POLICY MANAGER NetVertex NetVertex is a Service Aware Intelligent Policy Manager that brings intelligence into the network to make Product of policy enforcement decisions in real time based on the services, applications, network resources, e L I T E C O R E subscriber profile, SLA & application to ensure end to end QoS & charging in real time.NetVertex enables services providers reduce subscriber churn, the cost associated with non business data traffic and increase ARPUthrough monitoring subscriber usage pattern, network contention, manage application wise bandwidth and enabling usage basedcharging, It also provides platform for launch of subscriber intiated on demand services like BoD, music on demand, gaming ondemand etc. NetVertex Policy manager is compliant to 3GPP Release 8 (PCRF), WiMAX PCC and ETSI TISPAN standards withredundant and failover deployment architecture. NetVertex can be delivered pre-integrated with fully compliant OCS, BSS, AAA orIndependent Policy manager6 Elitecore Technologies Telecom Practices
  7. 7. Whitepaper Policy control for Packetcore NetworksTECHNICAL ABBREVIATIONS USED IN THE DOCUMENT! IMS - IP Multimedia Subsystem (IMS) is an architectural framework for delivering Internet Protocol (IP) multimedia services! PCRF – Policy and Charging Rules Function! BBERF – Bearer binding and event reporting function! Rx -resides between PCRF and AF, it enables transfer session information from AF to PCRF. Using Rx PCRF can notify AF of occurrence of a subscribed traffic plane event.(eg IP session has been closed)! Gx - The on-line policy interface between the GGSN and the Policy and charging rules function. Gx reference point enables a PCRF to have dynamic control over the PCC behaviour at a PCEF! Gxx -incorporates commands and AVPs, it enables gateway directly talk to PCRF.! Gy- resides between the OCS and the PCEF. The Gy reference point allows online credit control for service data flow based charging.! GZ- resides between the PCEF and the OFCS. The Gz reference point enables transport of service data flow based offline charging information.! SP- The Sp reference point lies between the SPR and the PCRF. The Sp reference point allows the PCRF to request subscription information such as subscriber ID, a PDN identifier and session attributes. The reference point allows the SPR to notify the PCRF when the subscription information has been changed.! PCEF – Policy Control and Enforcement Function! EPC – Evolved Packet Core! IETF - Internet Engineering Task force! 3GPP – Third Generation Partnership ProjectREFERENCES! A case study of Policy based QoS Management in 3G Networks by Korea Advanced Institute of Science and Technology, Republic of Korea! Understanding the Future Mobile Networks and Related Technologies by Fraunhofer, Fokus! ITU World Telecommunication, ICT Mobile World 2010 presentation! Automated and Scalable QoS Control for Network Convergence, Princeton University! Resource authorization in IMS with known multimedia service adaptation capabilities, University of Zagreb, Faculty of Electrical Engineering and Computing! Value Added Service Management in 3G networks, Communication Networks Laboratory,! Department of Informatics and Telecommunications, University of AthensAbout Elitecore Technologies TMElitecore Technologies is the provider of Billing & Revenue Management Solution- Crestel and Core Network Session Control Software- ELiteAAA and TMNetVertex - Service Aware Intelligent Policy Manager to enable Next Generation Voice, Video, Data Services offered by Tier-1 to Tier 3 Telecom Operators /Service Providers over Wireline or Wireless Networks. Elitecore is a Carlyle Investee company having customers across the globe with presence in more than78 countries. For more information, visit Elitecore Technologies at www.elitecore.com/telecompractices Corporate Office Sales & Marketing Elitecore Technologies Pvt. Ltd. Mumbai Tel: +91-22-66951280 / 1380 Fax: +91-22-66923363 904, Silicon Tower, Off. C.G. Road, Delhi Tel: +91-11-41589761/62 Fax: +91-11-41589760 Ahmedabad - 380 006. INDIA. Bangalore Tel: +91-80-40869000 / 81 Fax:+91-80-40869001 Tel: +91-79-66065606, Fax: +91-79-26407640 Bahrain Tel: +97316199249 Fax: +973-16-500-501 R Registered trade marks of Elitecore Technologies Pvt. Ltd. Elitecore disclaims any proprietary interest in Dubai Tel: +971505512789 trademarks and trade names other than its own. Copyright 1999-2010 Elitecore Technologies. All Rights Reserved. South Africa: +27 (0) 11 802 6000 Fax: +27 (0) 11 802 6001 Cell: +27 (0) 83 301 6055 USA Boston Tel: +1 781 460 2080/81Email us - marketing@crestel.in Elitecore Product I www.elitecore.com www.elitecore.com/telecompractices.com

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