Mobility Management Entity (for GERAN/UTRAN CSFB)
o Multiple PLMN selection and reselection for the CS domain
o Deriving a VLR number and LAI from the TAI of the current cell and based on the selected PLMN for CS domain, or using a default VLR number and LAI
o For CS fallback, generating a TAI list such that the UE has a low chance of "falling back" to a cell in a LA different to the derived LAI (e.g. the TAI list boundary should not cross the LA boundary)
o Maintaining of SGs association towards MSC/VLR for EPS/IMSI attached UE
o Initiating IMSI detach at EPS detach
o Initiating paging procedure towards eNodeB when MSC pages the UE for CS services
o Supporting SMS procedures with UE and MSC via SGs
o Rejecting CS Fallback call request (e.g. due to O&M reasons)
Mobility Management Entity (for 1xRTT CSFB)
o It serves as a signaling tunneling end point towards the 3GPP2 1xCS IWS via S102 interface for sending/receiving encapsulated 3GPP2 1xCS signaling messages to/from the UE
o Handling of S102 tunnel redirection in case of MME relocation
o 1xCS-IWS (terminating S102 reference point) selection for CSFB procedures
o Buffering of messages received via S102 for UEs in idle state
E-UTRAN for GERAN/UTRAN
o Forwarding paging request and SMS to the UE
o Directing the UE to the target CS capable cell via appropriate procedure (i.e. PS handover, RRC release with redirection, CCO w/NACC)
o The configuration of appropriate cell reselection hysteresis at Location Area boundaries (or across the whole E-UTRAN) to reduce Tracking Area Update traffic
o To facilitate the configuration of TA boundaries with LA boundaries, the E-UTRAN can
gather statistics (from the inbound inter-RAT mobility events of all UEs) of the most common LAs indicated in the RRC signaling
o Configuration to permit the operator to choose the target “fallback” RAT and frequency
MSC for GERAN/UTRAN
o Maintaining SGs association towards MME for EPS/IMSI attached UE
o Supporting SMS procedures via SGs to EPS
o In order to speed up the potential LAU procedure during CS fallback the MSC may be configured to lower the frequency of Authentication, TMSI reallocation and Identity check for UEs that are EPS/IMSI attached via the SGs interface
E-UTRAN for 1xRTT
o Provision of broadcast information to trigger UE for 1xRTT CS registration
o Establish CDMA2000 tunnel between the UE and MME and forward 1xRTT messages
o Directing the UE to the target CS capable cell via appropriate procedure (i.e. RRC release with redirection or enhanced 1xCSFB procedure with 1xSRVCC based)
o Release of E-UTRAN resources after UE leaves E-UTRAN coverage subsequent to a page for CS fallback to 1xRTT CS if PS handover procedure is not performed in conjunction with 1xCS fallback
o Invoking the optimized or non-optimized PS handover procedure concurrently with enhanced 1xCS fallback procedure when supported by the network and UE, and based on network configuration.
UE supporting GERAN/UTRAN CSFB
o CSFB procedures for EPS/IMSI attach, update and detach
o CS fallback request/reject and SMS procedures for using CS domain services
UE supporting 1xRTT CSFB
o 1xRTT CS registration over the EPS after the UE has completed the E-UTRAN attachment
o 1xRTT CS re-registration due to mobility
o CS fallback request/reject and SMS procedures for using CS domain services
o Includes enhanced CS fallback to 1xRTT capability indication as part of the UE radio capabilities if it supports enhanced 1xCSFB
o Includes concurrent 1xRTT and HRPD capability indication as part of the UE radio capabilities if supported by the enhanced CS fallback to 1xRTT capable UE
o Multiple PLMN selection and reselection for the CS domain
o Deriving a VLR number and LAI from the TAI of the current cell and based on the selected PLMN for CS domain, or using a default VLR number and LAI
o For CS fallback, generating a TAI list such that the UE has a low chance of "falling back" to a cell in a LA different to the derived LAI (e.g. the TAI list boundary should not cross the LA boundary)
o Maintaining of SGs association towards MSC/VLR for EPS/IMSI attached UE
o Initiating IMSI detach at EPS detach
o Initiating paging procedure towards eNodeB when MSC pages the UE for CS services
o Supporting SMS procedures with UE and MSC via SGs
o Rejecting CS Fallback call request (e.g. due to O&M reasons)
Mobility Management Entity (for 1xRTT CSFB)
o It serves as a signaling tunneling end point towards the 3GPP2 1xCS IWS via S102 interface for sending/receiving encapsulated 3GPP2 1xCS signaling messages to/from the UE
o Handling of S102 tunnel redirection in case of MME relocation
o 1xCS-IWS (terminating S102 reference point) selection for CSFB procedures
o Buffering of messages received via S102 for UEs in idle state
E-UTRAN for GERAN/UTRAN
o Forwarding paging request and SMS to the UE
o Directing the UE to the target CS capable cell via appropriate procedure (i.e. PS handover, RRC release with redirection, CCO w/NACC)
o The configuration of appropriate cell reselection hysteresis at Location Area boundaries (or across the whole E-UTRAN) to reduce Tracking Area Update traffic
o To facilitate the configuration of TA boundaries with LA boundaries, the E-UTRAN can
gather statistics (from the inbound inter-RAT mobility events of all UEs) of the most common LAs indicated in the RRC signaling
o Configuration to permit the operator to choose the target “fallback” RAT and frequency
MSC for GERAN/UTRAN
o Maintaining SGs association towards MME for EPS/IMSI attached UE
o Supporting SMS procedures via SGs to EPS
o In order to speed up the potential LAU procedure during CS fallback the MSC may be configured to lower the frequency of Authentication, TMSI reallocation and Identity check for UEs that are EPS/IMSI attached via the SGs interface
E-UTRAN for 1xRTT
o Provision of broadcast information to trigger UE for 1xRTT CS registration
o Establish CDMA2000 tunnel between the UE and MME and forward 1xRTT messages
o Directing the UE to the target CS capable cell via appropriate procedure (i.e. RRC release with redirection or enhanced 1xCSFB procedure with 1xSRVCC based)
o Release of E-UTRAN resources after UE leaves E-UTRAN coverage subsequent to a page for CS fallback to 1xRTT CS if PS handover procedure is not performed in conjunction with 1xCS fallback
o Invoking the optimized or non-optimized PS handover procedure concurrently with enhanced 1xCS fallback procedure when supported by the network and UE, and based on network configuration.
UE supporting GERAN/UTRAN CSFB
o CSFB procedures for EPS/IMSI attach, update and detach
o CS fallback request/reject and SMS procedures for using CS domain services
UE supporting 1xRTT CSFB
o 1xRTT CS registration over the EPS after the UE has completed the E-UTRAN attachment
o 1xRTT CS re-registration due to mobility
o CS fallback request/reject and SMS procedures for using CS domain services
o Includes enhanced CS fallback to 1xRTT capability indication as part of the UE radio capabilities if it supports enhanced 1xCSFB
o Includes concurrent 1xRTT and HRPD capability indication as part of the UE radio capabilities if supported by the enhanced CS fallback to 1xRTT capable UE
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