Multi-RAT Heterogeneous Networks. Presenter: S. Vasudevan, Technical Manager, Advanced Technology Standards

Transcription

1 Multi-RAT Heterogeneous Networks Presenter: S. Vasudevan, Technical Manager, Advanced Technology Standards

2 What are Multi-RAT Heterogeneous Networks Integrated Networks supporting a range of cell sizes and backhaul solutions that allow for seamless interworking between multiple radio access technologies and are operated using novel scalable self-organizing and self-optimizing techniques cell sizes include macro, micro, pico, and femto backhaul solutions include existing carrier-grade backhaul, commercial grade wired backhaul, DSL, Cable, in-band wireless backhaul, i.e. relays, and out-of-band wireless backhaul radio access technologies include 2G onwards + WiFi and other unlicensed technologies where coupled with LTE/LTE-A radio access networks self-organizing and self-optimizing techniques apply e2e and include those for RAN and CORE Such networks allow for Seamless mobility Leveraging of Common Network Assets especially in the CORE Common architecture and infrastructure for service delivery across the entire network Unconstrained radio evolution to meet changing subscriber needs A good example is CDMA networks evolving to LTE via ehrpd 2 12) CDG Oct 2009 All Rights Reserved Alcatel-Lucent 2009

3 ehrpd - Not Just a Bridge to LTE Not just voice Extend Communication Offers to PCs Bring IMS Services to Mobiles Embrace the Web Today Voice Centric Svc Applications Enablement: Enables 1xEV-DO to go beyond conversational services and offer converged multimedia, messaging & web services 3 12) CDG Oct 2009 All Rights Reserved Alcatel-Lucent 2009

4 Enabling Seamless Mobility - 1 CDMA/LTE Seamless Mobility will be critical for a successful LTE deployment LTE technology deployment will target high data traffic areas first Users will continue to demand uninterrupted coverage Interworking LTE with ehrpd (EV-DO) data and 1X voice maximizes ROI on all assets Strategic LTE In-bldg LTE Urban buildout LTE Hot Zone EV-DO Umbrella Network ehrpd is required for seamless IP mobility between EV-DO and LTE: Standalone ehrpd enables mobile enterprise VPN services & always on user services in advance of LTE migration 4 12) CDG Oct 2009 All Rights Reserved Alcatel-Lucent 2009

5 Enabling Seamless Mobility: Leveraging the LTE Air Interface for Handdown to ehrpd MME ernc Strategic LTE In-bldg LTE Urban buildout LTE Hot Zone ehrpd Umbrella Network Pre-registration zone E-UTRAN broadcasts pre-registration zone indication and CDMA system time Allows a UE to pre-register on HRPD and maintain the HRPD session via an inter-rat tunnel Supports a UE in quickly acquiring the CDMA pilot and CDMA system timing 5 12) CDG Oct 2009 All Rights Reserved Alcatel-Lucent 2009

6 Seamless Mobility: Pre-registration and Pre-registered Session Maintenance LTE Coverage A mobile travels along the border area D HRPD Coverage Subnet 1 The mobile s preregistration activities: Subnet 1 preregistion zone pre-registration zone. Preregistration zone code = HRPD color code A: Pre-registration to subnet 2 C B: No activity. C: Pre-registration to subnet 1. (Triggered session transfer from subnet 2 to subnet 1) D: No activity. Pre-registration triggering Boundaries Subnet 2 preregistion zone A B Subnet 2 LTE/HRPD coverage boundary HRPD Subnet border era identified by Secondary color codes 6 12) CDG Oct 2009 All Rights Reserved Alcatel-Lucent 2009

7 Seamless Mobility: Idle Hand Up from ehrpd to LTE LTE LTE + HRPD HRPD HRPD to LTE reselection triggering border LTE to HRPD reselection triggering border Spatial Hysteresis Global HRPD Coverage LTE + HRPD Overlapped Coverage LTE Traffic HRPD Traffic HRPD Coverage Hole LTE coverage only LTE Traffic HRPD Coverage Border Indication enables HRPD to LTE soft Re-direction HRPD Traffic HRPD Traffic LTE Coverage Border Indication Triggers LTE to HRPD Re-selection 7 12) CDG Oct 2009 All Rights Reserved Alcatel-Lucent 2009

8 High Level ehrpd Network HRPD 3GPP2 AAA HRPD AT ehrpd BTS RNC A10/A11 A10/A11 PDSN HA Internet Intranet IMS ehrpd AT ernc A10/A11 HSGW S2a PDN- GW HRPD AT BTS A12 EAP AKA STa 3GPP2 AAA 3GPP AAA/HSS 8 12) CDG Oct 2009 All Rights Reserved Alcatel-Lucent 2009

9 Core Network Integration: Hierarchical 1xEV-DO and A Flatter, All IP RAN and Core for LTE Potential SW upgrade on existing equipment 1xEV-DO (HRPD) Legacy EV-DO AT IP channel BTS BSC / RNC PDSN Packet Switched Core HA VPN 3GPP2 AAA ehrpd ehrpd AT ernc HS GW ebts IMS Internet / Intranet LTE 3GPP LTE AT MME PCRF HSS/ SPR IP channel enode B SGW Evolved Packet Core PDN GW 9 12) CDG Oct 2009 All Rights Reserved Alcatel-Lucent 2009

10 Service Enablement: Integrating ehrpd RAN with Converged Service Control Core Potential SW upgrade on existing equipment 1xEV-DO (HRPD) Legacy EV-DO AT IP channel BTS BSC / RNC PDSN Packet Switched Core HA VPN 3GPP2 AAA ehrpd AF (Application Function) Subscriber Identifier IP address of the UE Media type and format Flow description Application identifier Application Event Identifier Priority Emergency ehrpd AT ernc HS GW ebts SPR (Subscriber Profile Repository) Pre-emption Priority QoS Class identifiers Guaranteed bandwidth (GBR) Max Bit rates Charging related information; Subscriber category AF PCRF IMS Internet / Intranet HSS/ SPR PCEF Policy & Charging Rules Function Subscriber Identifier IP address of the UE IP-CAN bearer attributes Request type (initial, modification, etc.) Type of IP-CAN (e.g.hprd, I-WLAN, etc.) Location of the subscriber PDN & PLMN ID IP-CAN bearer establishment/modification A policy management entity that provides dynamic control of QoS, gating & charging policies for the EPS bearers at the SDF level 10 12) CDG Oct 2009 All Rights Reserved Alcatel-Lucent 2009 Determines how SDF s should be treated by the PCEF (HS-GW & PDN-GW) OCS OCS OFCS OFCS Online Charging System Offline Charging System PDN GW

11 Radio Evolution Upgrade to HRPD Rev B while maintaining all IWK capabilities with LTE Add software features from HRPD Rev C in a way that is transparent to the other radio accesses, for ex: to increase performance at cell edge Multi-streaming is a promising technology with performance that can improve even further with interference cancellation enabled mobile receivers Parse Incoming Data Stream for User RNC Flow Control based on Outflow Scheduler 1 Throughput (sector 2) calculated from mobile feedback Priority metric for handoff users: each scheduler uses combined throughput (at BS 1 + BS 2) Scheduler 2 Throughput (sector 1) calculated from mobile feedback BS 1 BS ) CDG Oct 2009 All Rights Reserved Alcatel-Lucent 2009

12 ) CDG Oct 2009 All Rights Reserved Alcatel-Lucent 2009