eHRPD and LTE Interworking CDG Americas Regional Conference San Diego 11 November 2009 © 3GPP2
eHRPD (evolved High Rate Packet Data) Overview eHRPD (evolved High Rate Packet Data) Attaching the HRPD access network to the Evolved Packet Core (EPC) IP environment via PMIP LTE Interworking eHRPD – optimized and non-optimized handoff 1x Circuit-Switched Fall Back (1xCSFB) 1x Single Radio Voice Call Continuity (1x SRVCC) Summary Purpose of Slide: Introduce topics to be covered in the presentation.
eHRPD Connectivity to EPC Architecture Legend Internet EPC entity IMS Operator Appls., Etc. 3GPP2 entity HSS IP Signaling Bearer AAA PCRF PDN GW HSGW Purpose of this slide: 3GPP2 Mission Statement ePCF eAN (Not all interfaces are shown in this figure.) UE
3GPP2 eHRPD Specifications TSG-X: X.S0057 – core network TSG-A: A.S0022 – radio access network TSG-C: C.S0087 – air interface TSG-C: C.S0095 – signaling and conformance tests TSG-S: S.R0129 – requirements TSG-S: S.R0138 – security Revision levels are aligned to 3GPP releases Rel-8: X.S0057-0, A.S0022-0, C.S0087-0 Rel-9: X.S0057-A, A.S0022-A, C.S0087-A Rel-10: X.S0057-B, A.S0022-B, C.S0087-B Point Releases are used to support bug fixes/changes: E.g., X.S0057-0 v1.0/v2.0/v3.0 etc. – 3GPP Rel-8
eHRPD Connectivity to EPC Architecture Legend Internet LTE-specific entity IMS Operator Appls., Etc. EPC entity HSS 3GPP2 entity IP Signaling Bearer AAA PCRF PDN GW MME SGW HSGW Purpose of this slide: 3GPP2 Mission Statement S103 ePCF eAN eNB S101 (Not all interfaces are shown in this figure.) UE
LTE eHRPD Handoff Optimized Handoff Non-Optimized Handoff Involves the use of S101 and S103 to minimize the gap in packet flow to reach the goal of < 300 ms. Signaling changes on the air interface to support S101 based tunneling. UE establishes context on eHRPD by signaling over S101. eNodeB (via the 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.
eHRPD LTE Idle Hand-Up LTE neighbor information is provisioned and broadcast by the eHRPD network. Reduce searches for LTE pilots. Minimize the device battery power consumption. Uses reselection (idle handoff) parameters and procedures. Similar parameters and procedures will be used for idle hand-up from 1x to LTE. eHRPDLTE active Hand-Up has not been defined by 3GPP.
LTE – 1x CSFB/SRVCC Architecture Legend LTE-specific entity Internet IMS Operator Appls., Etc. EPC entity 3GPP2 entity HSS/AAA HLR IP Signaling Bearer MGW PCRF PDN GW MSC MME SGW Purpose of this slide: 3GPP2 Mission Statement S102 eNB IWS BS UE
LTE – 1x CSFB LTE can be configured for Data, while Voice services are provided on cdma2000 1x. LTE uses the S102 interface to transparently pass cdma2000® 1x signaling to and from the cdma2000 1x system. Includes support for: Registration Paging for Mobile Terminated Calls SMS cdma2000® is the trademark for the technical nomenclature for certain specifications and standards of the Organizational Partners (OPs) of 3GPP2. Geographically (and as of the date of this presentation), cdma2000® is a registered trademark of the Telecommunications Industry Association (TIA-USA) in the United States.
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 cdma2000 1x voice call originations and terminations via S102 to reduce delays.
3GPP2 will continue to cooperate with 3GPP to enhance: 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 LTE interworking. Features made possible by attachment to EPC.
List of Acronyms AAA – Authentication/Authorization/Accounting BS – Base Station CSFB – Circuit-Switched Fall Back eAN/ePCF – evolved Access Network/evolved Packet Control Function eHRPD – evolved High Rate Packet Data eNB – eNodeB – evolved NodeB EPC – Evolved Packet Core HLR – Home Location Register HRPD - High Rate Packet Data HSGW – HRPD Serving Gateway HSS – Home Subscriber Server IMS – IP Multimedia Subsystem IWS – Interworking Server LTE – Long Term Evolution MME – Mobility Management Entity MGW – Media Gateway MSC – Mobile Switching Center PCRF – Policy Control Rules Function PDN GW – Packet Data Network Gateway PMIP – Proxy Mobile IP S-GW – Serving Gateway SMS – Short Message Service SRVCC – Single Radio Voice Call Continuity UE – User Equipment
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