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3GPP2: eHRPD and LTE Interworking

3GPP2: eHRPD and LTE Interworking. CDG Americas Regional Conference San Diego 11 November 2009. © 3GPP2. Overview. eHRPD Connecting to the EPC (Evolved Packet Core) Applicable standards An evolution path to IMS-based services (Is eHRPD really the evolution path to IMS-based services?)

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3GPP2: eHRPD and LTE Interworking

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  1. 3GPP2: eHRPD and LTE Interworking CDG Americas Regional Conference San Diego 11 November 2009 © 3GPP2

  2. Overview • eHRPD • Connecting to the EPC (Evolved Packet Core) • Applicable standards • An evolution path to IMS-based services (Is eHRPD really the evolution path to IMS-based services?) • LTE Interworking • LTE – eHRPD Interworking • eHRPD – optimized and non-optimized handoff • 1x Circuit Switch Fall Back (1xCSFB) • 1x Single Radio Voice Call Continuity (1x SRVCC)

  3. eHRPD • eHRPD is the attachment of the HRPD radio access network to the 3GPP Evolved Packet Core (EPC). • eHRPD provides a path to the LTE (E-UTRAN) radio technology via the EPC.

  4. Internet,IMS,Etc. IP ePCF eAN eHRPD Architecture Legend EPC entity Signaling HSS Bearer 3GPP AAA PDN GW PCRF HSGW

  5. 3GPP2 eHRPD Specifications • TSG-X: X.S0057 - Network • TSG-A: A.S0022 – IOS RAN • TSG-C: C.S0087 – Air Interface • Revision levels are aligned to 3GPP releases • Rel-8: X.S0057-0, A.S0022-0, C.S0087-0 v1.0, C.S0087-0 v2.0 • Rel-9: X.S0057-A, A.S0022-A, C.S0087-0 v2.0 • Rel-10: X.S0057-B, A.S0022-B • A Point Release is used to support bug fixes/changes: • E.g., X.S0057-0 v1.0/v2.0/v3.0 etc. – 3GPP Rel-8

  6. Internet,IMS,Etc. IP ePCF eAN LTE - eHRPD Interworking Legend EPC entity LTE entity HSS Signaling Bearer 3GPP AAA PDN GW PCRF * S101 and S103 may not be included in initial deployments. HSGW MME SGW S103* eNB S101*

  7. LTE  eHRPD Active Handoff • Optimized Handoff • Involves the use of S101 and S103 to minimize the gap in packet flow to less than 300 ms. • Signaling changes on AI to support S101 based tunneling. • UE establishes context on eHRPD by signaling sent over S101. • MME and eAN coordinate the handoff. • Non-Optimized Handoff • The UE leaves LTE coverage, attaches to eHRPD, builds context, and resumes packet flow. • Support in LTE to direct the handoff and provide eHRPD parameters. • Latency can be several seconds.

  8. eHRPD  LTE Idle Hand-Up • LTE neighbor information is provisioned and broadcast by the HRPD Network • Reduce AT searches • Minimize the access terminal power consumption • Uses reselection (idle handoff) parameters and procedures similar to that for UMTS LTE reselection • Supports non-priority/priority based idle hand-up • Supports soft reselection and back-off • The same parameters and procedures will also be used for idle hand-up from 1x to LTE

  9. LTE – 1x CSFB • LTE uses S102 interface to transparently pass 1x signaling to and from the 1x system. • Useful for: • Registration • Paging for Mobile Terminated Calls • SMS • LTE can be configured for Data, while Voice services are provided on 1x.

  10. LTE – 1x SRVCC • Single Radio Voice Call Continuity anchors a voice call in IMS. • Call is transferred from the packet environment to the MSC-based circuit environment. • Control is maintained in IMS. • May reduce latency in voice call handoff from packet to circuit. • Being considered for 1x voice call originations and terminations via S102 to reduce delays.

  11. Internet,IMS,Etc. IP LTE – 1x CSFB/SRVCC Architecture Legend EPC entity LTE entity HLR HSS Signaling Bearer MGW PDN GW PCRF MSC MME SGW S102 IWS BS eNB

  12. Future Work • 3GPP2 will continue to support Operators that choose to deploy LTE technologies • 3GPP2 will continue to cooperate with 3GPP to enhance: • eHRPD – LTE interworking • LTE - 1x CSFB / SRVCC • Features made possible by attachment to EPC. • Features made possible by LTE interworking.

  13. Thank You! For more information, please visit http://www.3gpp2.org

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