Cisco All-IP Mobile Wireless Network Reference Model

1. Cisco All-IP Mobile WirelessNetwork Reference Model Presentation_ID

2. Circuit Networks IP Network Enterprise Networks Other IP Networks Wireless becomes just another access technology Mobility mgmt & radios resource mgmt are the key Wireless Access: A Single IP Network Legacy Radio Access All-IP wireless access Other Access Networks (DSL, Cable, …)

3. Architectural Objectives • A flexible peer-to-peer distributed model • Replace the rigid hierarchical interconnection • Stateless intermediate transport mechanisms • Radio access becomes another type of physical link • Air interface efficiency • Support data compression • Efficient and effective mobility and QoS mgmt • Interwork with legacy wireless systems

4. Principles • Allow ubiquitous service appearance to end users • Align with existing Internet model to provide • flexibility, reliability, and availability • end-to-end QoS and security • Support all radio access technologies cdma2000, W-CDMA, GSM, and TDMA • Modular and incremental infrastructure growth • Fast services and applications development • Layered resource management and signaling support

5. Requirements • IP transport throughout the network • Integrated QoS, security, accounting, & VPN solutions • Independent of wireless access technology • Support existing air interfaces • Support multiple level of QoS • Open APIs to enable fast service creation & deployment • Unify the user & service authentication mechanisms

6. All-IP Network Reference Model

7. Architecture Guideline • Distributed IP-based “MSC” processing • MCF, CSM, ATCF, MGC, … • Better scalability and reliability than the legacy MSC • Fast creation of new services • Separation of CA and MCF • Convergence of wireline and wireless CAs and FSs • Support IN services using API on the standard CAs • MCF acts as wireless access signaling gateway • Better inter-operability between vendor products

8. BTS • Provides an RF-interface to mobiles • Channel coding and modulation • Consolidation and distribution function • Incorporates an IP based backhaul interface • Incorporates an IP-based control signaling interface • Autonomous power management

9. Radio Resource Control Function(RRCF) • Radio link management bring up and tear down the radio link for dedicated control or bearer channels upon receiving call control signaling from the core networks • Distribution of page messages • Radio resource management (de-)allocate all radio resources & power control mgmt functions • Handoff management across BTS & across RAN • Network usage recording

10. Radio Bearer Service Functions(RBSF) • Host the selection and distribution function • Rate negotiation with transcoder for dim and burst functionality • Host the radio link protocol functions like error detection/correction, encryption, etc. • (De-)multiplex user and signaling traffic for air interface • Packet Control Function • MAC functions • Link power control in CDMA

11. Mobility Control Function (MCF) • Track locations of moving subscribers • Search for a mobile when there is information to be delivered • Handle mobile roaming, handoffs, mobile-centric features: paging, registration, authentication, ... • Collaborates with other functional entities to handle ubiquitous mobile features such as Short Message Service (SMS), cell broadcast

12. Connection Control Session Management (CSM) • Call Agent • Provide VoIP call processing: call state machine and services • Act as an IP feature proxy for user devices that offer full feature support • Session Manager • Provide a high-level data session management Create a session context entry to correlate the subscriber’s MCF context to the current session. Select a DSF to handle a data call. The selected DSF is linked with the session context entry.

13. Admission & TranslationControl Function (ATCF) • A group of servers • policy services • Admission/QoS control • Address translation between IP and legacy networks • CSM, MCF, and MGC selection • providing user profiles and/or load information to MCF, CSM, MGC, BPGW upon request

14. Bearer Path Gateway • Voice BPGW • perform bearer stream routing • provide bearer interface to the radio access • act as an anchor point for the bearer stream • Data Service Function (DSF) Maintain detailed session context. perform packet forwarding and tunnel management for each session perform AAA and QoS management functions manage the IP Mobility

15. Service Delivery • Traditional Voice Services • Transport voice in traditional voice frames over the air interface • Voice frames are converted into VoIP packets by an appropriate entity (e.g., BTS) • Integrated Data Services • Transport mobile user IP packets over the air interface • Basic data services • VoIP, multimedia services over basic data services

16. Packet Data Services • IPlayer tunneled transport model with QoS and security • Effective handoffs to enable multimedia & voice applications • The ability to access Home based services • Efficient transport of user data over the radio networks

17. Traditional Voice Services • RRCF interfaces with BTS to receive call & signaling msgs • MCF manages mobility & connections b/w BPGW & BTS • CSM maintains call state without feature server functions • Inter-MCF & inter-BPGW communications to support handoff