Transcript Document
Packet Data Roaming Common Architecture Richard Xu Chief Architect [email protected] +1(408) 834-0217 Aicent, Inc. November 11, 2005 CDMA 1995 2005 Celebrating Ten Years of Commercial Success and Innovation Background • Reiterate what have been stated: Problem Statement – CDG Reference Document #79 recommends three different packet data roaming architectures: • SIP • MIP • L2TP – Different operators prefer to use different architectures – Different operators are able to support different combinations of these architectures for inbound roaming partners. – Not all of these architectures are compatible CDMA 1995 2 2005 Celebrating Ten Years of Commercial Success and Innovation www.cdg.org Matrix of combinations Serve Network SIP L2TP MIP SIP NO ISSUE SOLUTION AVAILABLE NO SOLUTION, BUT NO KNOWN INSTANCES L2TP NO RECOMMENDED SOLUTION IDENTIFIED NO ISSUE NO SOLUTION RECOMMENDED IDENTIFIED MIP NO RECOMMENDED SOLUTION IDENTIFIED NO RECOMMENDED SOLUTION IDENTIFIED NO ISSUE Device • The following matrix identifies incompatibilities • “Device” indicates the technology preferred by the roaming device • “Serve Network” indicates the network technology available in the visited operator’s network CDMA 1995 3 2005 Celebrating Ten Years of Commercial Success and Innovation www.cdg.org Extra IP Routing Issues Home Network Serving Network Home network insists outbound roaming traffic coming back from CRX Home network allows outbound roaming traffic from Internet Serving network routes all inbound roaming user traffic to Internet for accessing home services No RECOMMENDED SOLUTION No ISSUE Serving network routes all inbound roaming users traffic via CGX NO ISSUE No RECOMMENDED SOLUTION CDMA 1995 4 2005 Celebrating Ten Years of Commercial Success and Innovation www.cdg.org Common Architecture • Incorporate most roaming scenarios into a common recommended architecture for each CDMA operators based on existing CRX principles • Simplify the provisioning process • Future applications proven CDMA 1995 5 2005 Celebrating Ten Years of Commercial Success and Innovation www.cdg.org Definition of roaming service elements • At operator premise: – Core Subnet (CS): PDSN/FA/LAC, HA, AAA, MMSC(MM4 Interface) – Service Subnet (SS): Application Servers (WAP, PoC Server, MMSC, Email) – Roaming-in Subnet (RIS): IP Subnet assigned to inbound roamers Internet FW/GW Roaming-In Sub PDSN CDMA 1995 6 2005 Celebrating Ten Years of Commercial Success and Innovation Core Sub AAA HA LNS MMSC PoC WAP Service Sub BG CRX www.cdg.org Definition of roaming service elements • At CRX premise: – Core Backbone: routing for Core Subnet traffics – Virtual Home Subnet: subnet for hosted roaming elements, e.g. LNS for L2TP Internet FW/GW FW/GW Roaming-In Sub Virtual Home MMSC PoC LNS WAP Operator PDSN Core Sub AAA HA LNS Core Backbone Service Sub BG BG Proxy AAA CRX CDMA 1995 7 2005 Celebrating Ten Years of Commercial Success and Innovation www.cdg.org New Service Element from CRX • At CRX premise: – Virtual Home Subnet • LNS fulfilling L2TP that is not supported by home network • Tunnel connection to Home network • Internet Access RIS CRX Visited Core Sub LNS Home Service Sub Virtual Home MMSC GRE User Traffic PoC WAP Core Backbone PDSN BG BG Proxy AAA GRE BG BG AAA L2TP Tunnel GRE Tunnel CDMA 1995 8 2005 Celebrating Ten Years of Commercial Success and Innovation www.cdg.org Common Architecture for both CRX and Operator • • At operator premise: – GRE Tunnel terminating point (router) as extra element • GRE Physical end-point (IP) belonging to Core Sub (routable via CRX backbone) At CRX Virtual Home Subnet: – Two GRE tunnel terminating points (routers) • One tunnel to carry Service Sub routes • The other tunnel to carry RIS routes – CRX only routes core sub and GRE tunnels traffics compliant with Doc#94 – Together with LNS in Virtual Home, the architecture resolves most mismatched cases except MIPSIP, where MIP Client is required to fallback SIP Virtual Home Operator Roaming-In Sub Routing Mgr. RIS GRE Service Sub CDMA 1995 9 Core Sub GRE BG LNS Service Subs GRE GRE Tunnel for RI-Sub BG GRE Tunnel for Service Sub Core Backbone 2005 Celebrating Ten Years of Commercial Success and Innovation www.cdg.org Roaming Scenario: SIPL2TP • • • Home Operator exchanges its service routes with virtual home via service tunnel if enforcing roaming-in via CRX. CRX injects tunnel related attributes in RAIDUS reply package to trigger visiting PDSN/LAC to build L2TP tunnel with LNS in virtual home. User traffic is either routed via service tunnel or internet depending on routes availability at virtual home. Internet FW/GW Service Subs RIS CRX Visited Core Sub Virtual Home LNS Home Service Sub MMSC GRE PoC WAP Core Backbone PDSN BG BG Proxy AAA GRE BG BG AAA CDMA 1995 10 2005 Celebrating Ten Years of Commercial Success and Innovation L2TP Tunnel Service Tunnel www.cdg.org Roaming Scenario: L2TPSIP • • • Home Operator exchanges its service routes with virtual home via service tunnel if enforcing roaming-in via CRX. CRX remotes tunnel related attributes in RAIDUS reply package to ensure SIP. Visited Operator assigns inbound roamer with IP within RIS, and routes to GRE tunnel router where user traffic is either routed to virtual home or Internet depending on the routes availability managed by virtual home. Internet FW/GW Service Subs RIS Roaming-In Sub CRX GRE Virtual Home Home Service Sub MMSC GRE PoC GRE WAP Core Backbone Visited Core Sub PDSN BG BG Proxy AAA GRE BG BG AAA CDMA 1995 11 2005 Celebrating Ten Years of Commercial Success and Innovation RIS Tunnel Service Tunnel www.cdg.org Roaming Scenario: MIP SIP/L2TP • MIPSIP/L2TP – Assuming MIP Client supports the fallback-to-SIP features – The scenario is similar to either L2TPSIP or SIPL2TP, depending on home network preference • SIP/L2TP MIP – Assuming PDSN in mobile IP only visited network supporting either SIP or L2TP – The scenario is similar to either L2TPSIP or SIPL2TP, depending on home network preference CDMA 1995 12 2005 Celebrating Ten Years of Commercial Success and Innovation www.cdg.org Summary • Introducing Virtual Home with hosted LNS and GRE tunnel endpoints at both Virtual Home and operator premises help to bridge the gap among different roaming scenarios • At operator premise, extra roaming element, the GRE router, requires minimum provisioning comparing to handling all different roaming scenarios • CRX plays more mediation roles to enhance experience of CDMA data roaming • The new revised architecture serves as interim solution until all PDSN could support all access requests. No impact on the future architecture, where CRX would just serve as core backbone for core subnets CDMA 1995 13 2005 Celebrating Ten Years of Commercial Success and Innovation www.cdg.org