CN104509150A - Internetworking for circuit switched fallback-network initiated USSD request/notification procedure mobile-terminated location request procedure provide subscriber information procedure - Google Patents
Internetworking for circuit switched fallback-network initiated USSD request/notification procedure mobile-terminated location request procedure provide subscriber information procedure Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/12—Messaging; Mailboxes; Announcements
- H04W4/14—Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
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- H—ELECTRICITY
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- H04W36/00—Hand-off or reselection arrangements
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- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
- H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
- H04W68/02—Arrangements for increasing efficiency of notification or paging channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/08—Mobility data transfer
- H04W8/10—Mobility data transfer between location register and external networks
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Abstract
A method for switch user equipment from a Long Term Evolution system to a Circuit Switched system when receiving a voice call is disclosed. The method may comprise: receiving, at an IWF (Internet Working Function) network node, a Mobility Application Part Unstructured Supplementary Service Data (MAP USSD) message identifying a User Equipment (UE) originated from a USSD application, the UE associated with a first Mobile Switching Center (MSC); initiating Circuit Switched Fallback (CSFB) by sending a paging request to the UE; receiving a Cancel Location message associated with the UE from a Home Location Register (HLR) indicative of the UE being associated with a second MSC; forwarding the MAP USSD message to the UE via the HLR and the second MSC; receiving a MAP USSD response message from the UE via the HLR; and forwarding the MAP USSD response message to the USSD application.
Description
Field
Disclosure case relates to field of telecommunications, particularly relates to the network interconnection for circuit switched fallback.
Background
At present, the not support voice calling of Long Term Evolution (LTE) system, therefore for these callings perform by the circuit switched fallback (Circuit Switched Fallback:CSFB) of 3GPP standard TS23.272 defined.Realize by the interface between the MME (mobile management entity) in EPS and VLR (visitor location register) being reused the Gs interface mechanism defined in 3GPP TS 29.018 via the CS Backward Function of CS core network and SMS (short-message system) Message Transmission.This interface is called as SGs interface.
Such as, strengthen network in case on LTE radio paging mobile device, and when the mobile device on LTE radio receives voice call page request by LTE system, mobile device rollback to CS radio to receive audio call.Together with CSFB, the data session of any activity is suspended or is switched to 2G/3G PS (packet switching) access.For mobile originating (MO) calling, the mobile device on LTE radio or subscriber equipment (UE) oneself initiate rollback, to start audio call in the cs domain.The mobile device of camping on LTE radio can send without the need to rollback and receive SMS message.Basic conception forces UE rollback to CS radio to carry out the audio call of non-VoLTE (the upper voice of LTE).In order to perform CSFB, between MME (mobile management entity) and MSC/VLR (mobile switching centre/visitor location register), need the new interface being called SGs, learn that to allow MSC when attached by EPC (evolution block core) UE is.MSC/VLR, as usual to HLR (attaching position register) registration, makes Mobile Termination (MT) audio call and SMS message be routed to there.In these cases, MO/MT SMS message is passed in LTE access and EPC via MSC.For MO calling, UE rollback before originating call, to CS radio, therefore changes without any need for core network.For MT calling, calling is passed to MSC as usual, and MSC carrys out paging UE via the new SGs interface between MME and MSC.UE rollback is to CS radio and send location updating or page response.MSC completes calling.If UE rollback is to the MSC different from the MSC sending SGs paging, then need complicated " roaming retry " process to complete calling.That is, this process need new interface and the existing node revised in each of LTE and C/S system.New SGs interface is needed between MME in MSC and EPC in CS core network.SGs makes MSC learn, and EPC is attached, the MO/MT SMS of EPC attached period, and make MSC in EPC and LTE access paging subscriber to carry out audio call.As for modified node, the state machine that MSC needs SGs interface and is associated.MME needs SGs interface also to revise the state machine be associated, and if enable the S3 interface that ISR (minimizing of idle pulley signaling) then needs SGSN.MSC/HLR/GMSC all needs to change to support roaming retry, and CSFB makes roaming retry more possible.
Accompanying drawing explanation
Fig. 1 is the simplified block diagram of the embodiment of communication system for circuit switched fallback;
Fig. 2 A-2I be circuit switched fallback is shown during the simplified block diagram of embodiment of communication system;
Fig. 3 A and 3B is the call flow chart of the embodiment that circuit switch fall back procedure is shown;
Fig. 4 is the flow chart that the exemplary method exchanging rollback for executive circuit is shown;
Fig. 5 is the call flow chart of the embodiment that the USSD request process that new network is initiated is shown;
Fig. 6 is the simplified block diagram of the exemplary embodiment of communication system;
Fig. 7 is the call flow chart of the embodiment that new Mobile Termination position message process (MT-LR) is shown; And
Fig. 8 illustrates newly to provide subscriber information, call flow chart to the embodiment of the rollback of CS process.
Embodiment
Fig. 1 be for when receiving audio call by subscriber equipment (UE) from Long Term Evolution (LTE) systematic evaluation to the example communication system 100 of circuit switching (CS) system.Such as, when UE camps the instruction receiving the calling of mobile device terminated speech in LTE system and from CS territory, UE can switch to CS network (2G or 3G) with call accepted.Usually, switch to CS network from LTE network and be called as circuit switched fallback (CSFB) to carry out audio call.In some implementations, system 100 can perform CSFB independently or without the need to comprising SGs interface in mobile switching centre (MSC).In addition, system 100 can perform CSFB independently or without the need to revising existing MSC.Such as, system 100 can comprise CSFB network interconnection function (IWF) 102 (more discussing in detail below), and CSFB network interconnection function (IWF) 102 is connected to CS network by MAP interface and is connected to LTE network by SGs interface.At this moment, system 100 can be eliminated, and reduces or otherwise stops following matters: the change (such as, MSC place is without SGs interface, without configuration variation) at MSC place; Roaming retry (such as, save complicated MSC/HLR function, reduce call setup delay); TA to LA maps (such as, all TA can be mapped to the single LA that CSFB has); Process MT call bearer (such as, without carrying trunk, reducing costs); And/or other.
In some implementations, under high-level, system 100 comprises CSFB IWF 102, CSFB IWF102 and is coupled to C/S system 104, LTE system 106 and UE 108 communicatedly by network 104 and 106.C/S system 104 comprises radio access network (RAN) 110 and cellular core network 112, and LTE system 106 comprises the LTE radio access network 114 of such as evolution UTRAN (E-UTRAN 114) and so on and is called the core network 116 of evolution block core (EPC) 116.Cellular core network 112 comprises GMSC 118, HLR 120, MSC/VLR 122 and SGSN 124.EPC 116 comprises MME 126 and home subscriber servers (HSS) 128.For high-level description, when UE perform on EPC 116 IMSI attached time, CSFB IWF 102 registers to providing the MSC/VLR of service.Upon registration, GMSC 118 can receive the request of importing into stop with the audio call of UE and to send the request to routing iinformation to HLR 120.Determine to present to cellular core network 112 CSFBIWF 102 as the MSC providing service after, HLR 120 can send request to MSRN to CSFB IWF 102.In conjunction with storing the information identified with this request, CSFB IWF 102 is sent request with rollback to cellular system 104 to UE 108 by the MME 126 of EPC116.UE 108 can send request to upgrade its position to MSC/VLR 122 by RAN 110, and this position is relayed to HLR 120.HLR 120 assigns MSC/VLR 122 as providing the MSC of service and sending canceling position request to CSFB IWF 102 again.CSFB IWF 102 sends the new request to routing iinformation to HLR 120, and confirm, in (PRN Ack), the MSRN received is sent to GMSC 118 at PRN, GMSC 118 uses this MSRN to route the call to MSC/VLR 122, calls out and completes at MSC/VLR 122 place.
Go to the more detailed description of system 110, CSFB IWF 102 can comprise and can be used for combining the Mobile Termination request received for audio call from cellular core network 112 UE 108 is transferred to any software of C/S system 104, hardware and/or firmware from LTE system 106.Such as, CSFB IWF 102 can paging UE 108 to ask the renewal position requests about the HLR 120 in cellular core network 110.By upgrading the position in cellular system 104, the MSRN that CSFB IWF 102 can use cellular system 104 to assign at position reproducting periods asks to reply PRN.When initiating the position upgraded, CSFB IWF 102 can make UE 108 rollback to CS radio to carry out audio call, and this audio call is not voice on LTE (VoLTE).In some implementations, CSFB IWF 102 can be included in the new interface (SGs) of MME 126, MME 126 CSFB IWF 102 can be made to determine when operating as MSC/VLR when UE 108 is attached to EPC 116.CSFB IWF102 can comprise following such interface: such as arrive the SGs of MME 126, the MAP to HLR 120, the MAP to SMSC and/or other.For can operative norm SGs function to the SGs of MME 126, CSFB IWF 102, and/or CSFB IWF 102 can be designated visitor location register (VLR) by MME 126.In other words, CSFB IWF 102 can support the SGs interface from MME 126 in EPC territory.In these cases, CSFB IWF 102 can show as VLR to MME 126.The CSFB IWF 102 subscriber in EPC territory being served as to VLR/MSC can be mutual by MAP interface and HLR 120, and SMSC in the process of being correlated with for SMS and network 112 is mutual.CSFB IWF 102 can comprise the state machine of definition in " VLR " and 3GPPTS 29.118 maintaining SGs state.For the MAP to HLR 120, CSFB IWF 102 can use this interface executing location renewal process and/or call routing process.MAP interface between CSFB IWF 102 and HLR120 can be used for location management, subscriber management and/or call handling process.For the MAP to SMSC, CSFB IWF 102 can use MAP MO short-message and/or MAPMT short-message to perform MO/MT SMS process.Such as, the MAP interface between CSFB IWF 102 and SMSC can be used for the SMS of mobile originating and/or the SMS of Mobile Termination.In some implementations, CSFB IWF 102 can operate independently or operate without the need to carrying facility (such as, TDM trunk).CSFB IWF 102 can perform following one or more: receive MT call signaling from HLR 120, because it shows as the MSC/VLR providing service; Send SG paging request to trigger CSFB; Initiate MT call signaling calling to be redirected to the MSC/VLR that new (with real) provides service; And/or other functions.In conjunction with these processes, UE 108 can rollback to CS territory and executing location upgrade MSC/VLR 122.In addition, once CSFB IWF 102 is again to calling, UE 108 just can accept this calling.As previously mentioned, in some implementations, CSFB IWF 102 can emulate or otherwise himself is expressed as the element of core network 112.Such as, CSFBIWF 102 can emulate or otherwise himself is expressed as other elements of MSC, VLR or cellular core network 112.When communication node 108 emulation MSC, CSFB IWF 102 can be inquired by the HLR 120 in cellular core network 112 as any other MSC.
Go to the detailed description of other elements in system 100, LTE system 106 can comprise EPC 116 and E-UTRAN 114.EPC 116 is provided to the connection of the external network of such as cellular core network 112.EUTRAN 114 comprises such as such a or multiple base station, eNode-B (eNB) base station, and described base station provides (multiple) wireless service to UE 108.Core network based on EPC can comprise the gateway (SGW), MME 126 and the packet gateway (PGW) that provide service.SGW can in EPC 116 routing traffic.MME 155 is responsible for core network and moves control, UE 108 to the attached of core network and for maintaining the contact with idle pulley UE.PGW be responsible for enabling from/to the inlet/outlet of the traffic of the Internet.PGW can to UE 108 distributing IP address.
Wireless communication system based on LTE has the network interface defined between system element.Network interface is included in the Uu interface defined between UE and eNB, the S1U user plane interface defined between eNB and SGW, the S 1C control plane interface defined between eNB and MME (also referred to as S1-MME) and the S5/S8 interface defined between SGW and PGW.Notice that the combination of S 1U and S 1C is reduced to " S1 " usually.
MME 126 is the Controlling vertex for LTE access network.MME 126 is responsible for comprising the UE 108 retransmitted and follows the tracks of and paging.MME 126 processes bearing activation/disable procedures, and is also responsible for being that UE 108 selects SGW when initial attach and when switching in LTE.MME 126 is also by carrying out authentication of users alternately with HSS 124.MME 126 also generates temporary identity and temporary identity is dispensed to UE, and stops non-access stratum (NAS) signaling.MME 126 checks the mandate of UE 108 upper and implement UE roaming restriction in the Public Land Mobile Nerwork (PLMN) of service provider to camp.MME 126 is the terminating points for being encrypted NAS signaling in the network of code/integrity protection, and processes security key management.MME 126 also supports the lawful intercept of signaling.MME also with S3 interface for the movement between LTE and 2G/3G Access Network provides control plane function, S3 interface stops at MME 126 place from SGSN 130.MME 126 also stops S6a interface for roaming UE towards ownership HSS 128.
SGW route also forwards user data packets, and serves as the mobile anchor of user plane during also switching between eNB and the anchor served as the movement between LTE and other 3GPP technology (termination S4 interface and between 2G/3G system and PDN GW trunk traffic) simultaneously.Downlink data path is stopped for idle condition UE, SGW, and triggers paging when the down link data for UE 108 arrives.SGW management and storage UE context, the parameter of such as IP carrying service and network internal routing iinformation.SGW also performs copying of user's traffic when lawful intercept.PGW by becoming exit point and the inlet point of the traffic of UE 108, for UE 108 provides connection to external packet data networks.UE 108 can have and is connected to access multiple packet data network with while more than one PGW.The enforcement of P-GW implementation strategy, the packet filtering to each user, support of charging, lawful intercept and grouping screening.PGW is also for the movement between 3GPP and non-3 gpp technology (such as WiMAX and 3GPP2 (CDMA 1X and EvDO)) provides anchor.Can be used for providing deep packet tackle and provide advertisement by subscriber to user as described above on the underframe realizing SGW or PGW according to SGW or PGW of this embodiment.
Cellular Core system 104 generally comprises various switching devices, gateway and service controlling functions for providing cellular service.Other communication systems that cellular system is such with such as EPC 116 by providing these to serve via multiple honeycomb access network (such as RAN), and are carried out interface by Cellular Core system 104.According to cellular standards, Cellular Core system 104 can comprise for the treatment of circuit switching (or the voice switching) part of audio call and packet switching (or data exchange) part for supported data transmission, and transfer of data is such as email message and web-browsing such as.Circuit switched part comprises MSC/VLR 122, MSC/VLR 122 and switches between cellular access system 106 and PSTN 104 or another network, between cellular core network or other networks or connect call.MSC/VLR 122 can only support towards the single medium stream of RAN 110 (such as, for the single TDM channel of standard A joggle, the single rtp streaming for AoIP).This single medium stream can be used for supplemental services, and supplemental services relates to/from multiple callings of the such as Call Waiting of mobile radio station.In other words, to/on the access interface of MSC, share single medium from multiple callings of GSM mobile radio station to connect.
Cellular Core system 104a also can comprise HLR 120 for maintaining " forever " subscriber data and for using wireless communications method the subscriber data retrieved from HLR 120 and up-to-date information " temporarily " to be maintained VLR (and/or SGSN) on the position of those UE 108.In addition, Cellular Core system 104 can comprise checking, authorization and accounting (AAA), and checking, authorization and accounting (AAA) perform the role of checking, authorization and accounting for the UE 108 that can be used for accessing Cellular Core system 104.Although describe the description of core system 104 relative to GSM network, core system 104 can comprise such as UMTS, CDMA and other cellular radio technology, and does not deviate from the scope of the disclosure case.
RAN 110 provides radio interface between mobile device 102a and cellular core network 104a, and this radio interface can provide real-time voice, data and multimedia service (such as, calling out) to UE 108.Usually, RAN 110 transmits air frame (air frame) via radio frequency (RF) link.Particularly, change, for being transmitted by cellular core network 104a between the message of RAN 110 aloft frame and physically based deformation link.RAN 110 can realize during the transmission one: GSM access in such as following air interface standard, UMTS access, code division multiple access (CDMA), time division multiple access (TDMA), general packet radio service (GPRS), for the enhancing data rate (EDGE) of global evolution or exclusive radio interface.User can subscribe RAN 110, such as, to receive cell phone service, global positioning system (GPS) service, XM wireless radio service etc.
RAN 110 can comprise the base station (BS) being connected to base station controller (BSC) 132.BS RAN 110 reception over geographic areas and send air frame (that is, being sent by UE 108), and to communicate with other UE being connected to Cellular Core system 104.Each BSC 132 is associated with one or more BS 114 and controls the BS 114 that is associated.Such as, BSC 132 can provide such as following functions: the control of switching, cell configuration data, RF power level or route to BS and any other the suitable function from BS route signal for managing radio resources and by signal.MSC/VLR 122 can be connected to BSC 132 by the standard interface that such as A interface is such.Although describe the element of RAN 110 relative to GSM network, RAN 110 can comprise other cellular technologies, such as UMTS, CDMA and/or other.In case of umts, RAN 110 can comprise Node B and radio network controller (RNC).
Go to the more detailed description of element, UE 108 comprises the electronic equipment that can be used for receiving and send radio communication to system 100.As used in disclosure case, UE 108 intention comprises the one or more processor in cell phone, Data-phone, beep-pager, portable computer, SIP phone, smart phone, personal digital assistant (PDA), these and other equipment or cellular radio technology can be used to transmit any other suitable treatment facility of information.In shown realization, UE 108 can send in one or more cellular band.In these cases, the message that UE 108 sends and/or receives can based on cellular radio technology.Can by any amount of UE108 being coupled to cellular access network 110 communicatedly.Generally speaking, UE 108 can send the special content of voice, video, multimedia, text, web content or any other user/client computer.In brief, UE 108 can be generated request, response or otherwise communicated with mobile core system 104a by RAN 110 or communicated by E-UTRAN114 and EPC 116.
Operation some in, system 100 can perform following one or more: receive from the attaching position register (HLR) CS network and ask together with mobile termination request the roaming number (PRN) that provides of mobile radio station roaming number (MSRN); Sent request with rollback to C/S system to UE by the mobile management entity (MME) in LTE system; Canceling position (CL) request is received together with being reallocated to the position of the UE of different MS C from HLR; At least in response to CL request, transmit to HLR and send routing iinformation (SRI) request; MSRN is received from MSC by HLR; Use the MSRN received, make calling use MSRN to HLR transmission PRN confirmation (PRN Ack) and UE is stopped; And/or other.
Fig. 2 A-2I illustrates the system 200-280 performing the signaling of CSFB for some realizations according to disclosure case.With reference to Fig. 2 A, GMSC 118 Received signal strength 202, signal 202 indicates the request for the calling of UE 108 terminated speech.With reference to Fig. 2 B, system 210 illustrates the signal 212 of the MSRN of request UE 108.Particularly, GMSC 118 sends to HLR 120 provides roaming number (PRN) to ask, and PRN request is sent to CSFB IWF 102 as the MSC/VLR being used for UE 108 by HLR 120.With reference to Fig. 2 C, system 220 illustrates signal 222, and signal 222 illustrates that request UE 108 upgrades the paging of its position about HLR 120.Particularly, paging is sent to MME 126, MME 126 and by EUTRAN 114, paging is sent to UE 108 again by CSFB IWF 102.With reference to Fig. 2 D, system 230 illustrates that communication is back to RAN 110 from E-UTRAN 114 by UE 108.With reference to Fig. 2 E, system 240 illustrates signal 242, and signal 242 asks location updating to cellular core network 112.Particularly, UE 108 sends update request by BSC 132 and MSC/VLR 122 to HLR 120.With reference to Fig. 2 F, system 250 illustrates signal 252, and signal 252 illustrates that UE 108 registers to different MSC.Particularly, HLR 120 MSC/VLR 122 upgrades the registration of UE 108, and sends canceling position (CL) request to CSFB IWF 102.With reference to Fig. 2 G, system 260 illustrates signal 262, and signal 262 asks current MSRN to HLR 120.Particularly, CSFB IWF 102 uses MSISDN to send SRI request to HLR 120, and MSISDN identifies the previous PRN request received from GMSC 118 via HLR 120.With reference to Fig. 2 H, system 270 illustrates signal 272, and signal 272 is for retrieving MSRN and MSRN being sent to CSFB IWF 102.Particularly, MSC/VLR 122 is designated VMSC and retrieves current MSRN from MSC/VLR 122 by HLR 120.With reference to Fig. 2 I, system 280 illustrates signal 282, and current MSRN is sent to GMSC 118 to complete the mobile termination for UE 108 via HLR 120 by signal 282.
Fig. 3 A and 3B illustrates that some realize the call flow 300 for performing CSFB according to disclosure case.In call flow 300, if the band of position of new community is different from the band of position stored in UE 108, then the RA/LA renewal process of UE 108 enable position area update or combination.CSFBIWF is assigned LAI, and the LAI in this LAI and 2G/3G space is mutually exclusive, and UE 108 always enable position area update is forced in 2G/3G space.In idle mode, MME 126 sends paging request to eNodeB 114, and eNodeB 114 sends this request to UE 108 again.MME 126, after receiving expansion service request from UE 108, sends service request to CSFB IWF 102.In active mode, MME 126 directly sends CS paging request to UE 108, because its built vertical S 1 connects.MME126, after sending paging request to UE 108, and then sends service request to CSFB IWF 102.In some implementations, service indicator can be set to " CS call indicator " by CSFB IWF 102 in SGAP-PAGING-REQUEST (SGAP-paging-request) message.CSFB IWF 102 can identify this designator when receiving MAP PRM message from HLR 120.CSFB IWF102 may not comprise at SGAP-PAGINGREQUEST with properties, because these attributes possibility unavailable (such as, LCS client identity, LCS designator).MSC/VLR 122 may not receive service request information from CSFB IWF 102.3GPP TS 23.272 represents, service request information can be used as trigger and is being in progress to notify this calling to calling party and starting CFNRy timer.CSFB IWF 102 can follow standard procedure and carry out notification call progress.Once UE rollback to GERAN/U-TRAN and calling set up there, call progress just can be triggered by normal processes.Once CSFB IWF 102 receives SGsAP-SERVICEREQUEST (SGsAP-service request) from MME 122, it can send paging retry subsequently.2G/3G BSC/MSC may not respond from UE 108 paging receiving, because its always executing location area update after moving from E-UTRAN 114.MAP CANCELLOCATION (MAP canceling position) is sent to old MSC (being CSFBIWF 102 in this situation) to process the MAP UPDATE LOCATION (MAP upgrades position) from new MSC/VLR 122 by HLR 120 concurrently.CSFB IWF 102 may not wait for that MAP UPDATE LOCATION process (this process comprises one or more MAP INSERT SUBSCRIBER DATA (MAP inserts subscriber data) message) to complete before transmission MAP CANCEL LOCATION.MAP UPDATE LOCATION process from the new MSC/VLR 122 in HLR 120 place and the MAP SRI process from CSFB IWF 102 can walk abreast generation, or occur at least in combination.CSFB IWF 102 may not know when new UPDATE LOCATION completes and do not carry out wait and MAP SRI is sent to HLR 120.The triggering making CSFB IWF 102 send MAP SRI can be receive MAP CANCEL LOCATION.HLR 120 can wait for, until complete in the MAP SRI message of process from CSFB IWF102 from the MAP UPDATE LOCATION of new MSC/VLR 122.Substantially, CSFB IWF 102 can wait for that MAPUPDATE LOCATION process to complete before sending MAP PRN message to new MSC/VLR 122.CSMT mark may not support by 2G/3G MSC/VLR, if therefore it is received from UE 108 in LOCATION UPDATE message, this parameter can be ignored.Due to this, the rear line release SCCP that MSC/VLR 122 can complete at position area update procedures connects.HLR can send IMSI and MSISDN to CSFB IWF 102 in MAP PRN message.CSFB IWF 102 can be relayed to HLR 120 for initial call when the errored response receiving MAP SRI request in PRN response.CSFB IWF 102 can comprise in the MAP SRI request being sent to HLR 120 and suppress T-CSI parameter.CSFB IWF 102 can ignore the substantially all service instructions from HLR 120 in MAP SRI responds.If can support to switch (that is, the switching of alive packets session) the RAT from E-UTRAN 114 to UMTS/GSM, then MME 126 can be direct mutual with SGSN as specified in 3GPP TS 23.401.CSFB IWF 102 may not be related in these processes.By calling station area update procedures when subscriber moves to UTRAN/GERAN from E-UTRAN 14, compared with standard C SFB call attempt, CSFB architecture can introduce additional postdialing delay.The LI of MT calling can be managed everywhere at 2G/3G MSC/VLR 122.In this case, may not need to roam retry procedure in this CSFB IWF architecture.
In some implementations, MME 126 can send SGsAP-PAGING-REJECT (SGsAP-paging-refusal) message to CSFB IWF 102, and the corresponding actions at CSFB IWF place.If UE 108 is known and be regarded as EPS service being that IMSI is attached and " only SMS ", MME 126 can return SGsAP-PAGING-REJECT message, and this message indicates in SGs cause information element " the CS rollback calling of Mobile Termination is refused by user ".CSFB IWF 102 can send MAP PRN RESPONSE to HLR 120, and wherein user error is set to " facility is not supported ".If UE 108 is known and be marked as that IMSI is separated for EPS service or non-EPS service be marked as to IMSI (implicit expression or explicit) is separated, namely, the state of SGs association is SGs-sky (SGs-NULL (SGs-is empty)), MME 126 can return SGsAPPAGING-REJECT message, and this message indicates the situation of separation (" be that IMSI be separated for EPS service ", " be IMSI separation for non-EPS service " or " be IMSI implicit detach for non-EPS service ") in SGs cause information element.CSFB IWF 102 can send MAP PRN RESPONSE to HLR 120, and wherein user error is set to " subscriber do not identified ".If UE 108 is unknown and " MME replacement " is set as "false", MME 126 can return SGsAP-PAGING-REJECT message, indicates IMSI unknown in SGs cause information element.CSFB IWF 102 can send MAP PRN RESPONSE to HLR 120, and wherein user error is set to " unknown subscriber ".If UE 108 unknown and " MME replacement " be set as "True" and for EPS service be considered to be IMSI attached and " only SMS ", then MME 126 can return SGsAP-PAGING-REJECT message, in SGs cause information element, indicate " the CS rollback of Mobile Termination is refused by user ".CSFB IWF 102 can send MAP PRNRESPONSE to HLR 120, and wherein user error is set to " facility is not supported ".If UE 108 is marked as unreachable as being set as indicated by "false" in paging process tag, MME 126 can return SGsAP-UEUNREACHABLE message, in SGs cause information element, indicate " UE is unreachable ".CSFB IWF 102 is when receiving SGsAP-UE-UNREACHABLE (SGsAP-UE-is unreachable) message from MME 126, CSFB IWF 102 can send MAP PRNRESPONSE (MAP PRN responds) message, and wherein user error is set as " without subscriber's response ".CSFB IWF 102 can be converted to suitable SGs state based on the Reason For Denial in paging refuse information.If UE 108 fails to find GERAN/UTRAN radio when CS rollback is attempted, then call attempt may failure.In this case, HLR 120 possibility waiting-timeout responds from the PRN of CSFB IWF102.
Fig. 4 illustrates the flow chart 400 of exemplary method realizing for performing CSFB according to some of disclosure case.
Method 400 starts from step 402, wherein receives PRN request from HLR.Such as, the CSFB IWF 102 in Fig. 1 can receive PRN request from HLR 120, and this PRN asks the MSISDN of mark UE108.In step 404, store IMSI and ask identified MSIDN by PRN.In this embodiment, CSFB IWF 102 can store IMSI and ask identified MSIDN by PRN.Then, in step 406, by the MME paging UE in LTE system to upgrade position by CS network.About this example, CSFB IWF 102 can send paging to UE 108 to MME 126.In step 408, together with location updating, receive canceling position (CL) request based on assigning new MSC to UE from HLR.Equally in this embodiment, HLR 120 can assign MSC/VLR 122 based on HLR 120 to UE 108 and send CL request to CSFB IWF 102.In step 410, from the MSISDN that memory search has stored.Go to this example, CSFB IWF 102 can retrieve the MSISDN of mark in PRN request from memory.Then, in step 412, send to HLR the MAP SRI comprising previously received MSISDN and ask.In this embodiment, CSFB IWF 102 sends MAP SRI to HLR 120 and asks, and this MAP SRI request comprises the MSISDN of mark in PRN request.The MAP SRI receiving the current MSRN of mark UE in step 414 confirms (MAPSRI Ack).Then, in step 416, the PRN sending the current MSRN of mark to HLR confirms (PRN Ack).Again go to this example, CSFB IWF 102 can send to HLR 120 PRN comprising the current MSRN of UE 108 and confirm with the calling stopped for UE 108.
Fig. 5 is the call flow chart of the embodiment of the USSD request/notification procedure that the Mobile Termination that new network is initiated is shown.USSD is used for and the agreement of the USSD server communication of service provider by GSM cell phone.In this case, the MSC/VLR performing rollback be different from UE first rollback to MSC/VLR during CS.In other words, MSC changes during MT USSD (unstructured supplementary service data) request/notification procedure when rollback.IWF initiates rollback when MT calls out and then serves as USSD server, and is asked/notify to be passed to UE by USSD by HLR and new MSC.The MT USSD that call flow shown in Fig. 5 also can be applicable to network initiation notifies.
Focus on the call flow part in square frame, IWF serves as USSD server and sends MAP (MAP) USSD to HLR to be asked.Responsively, this USSD request is sent to new MSC/VLR by HLR.New MSC/VLR according to the CS process of standard by this USSD request forward to UE, and the response received from UE is sent to HLR.USSD confirms to be sent to HLR in response to the response receiving UE by MSC/VLR.This response is relayed to IWF by HLR, and USSD response is relayed to HLR by IWF further.Then, this USSD response is according to circumstances sent to USSD server or USSD application by HLR.
Fig. 6 is the simplified block diagram for the exemplary embodiment shown in Fig. 7 and in the communication system of new Mobile Termination position message (MT-LR) process described below.Fig. 6 is similar to Fig. 1 described above in detail.As further illustrated in fig. 6, the Lg interface based on MAP that GMLC 119 specifies via 3GPP communicates with IWF 102.
Fig. 7 is the call flow chart of the embodiment that new Mobile Termination position message (MT-LR) process is shown.As before, in this case, the MSC/VLR performing rollback be different from UE first rollback to MSC/VLR during CS.In other words, MSC changes during MT-LR process when rollback.IWF is initiated to the rollback of CS when MT calls out.Once rollback completes, IWF just serves as GMLC and by obtaining new MSC address from HLR, location interrogation is routed to new MSC.
Focus on the call flow part in square frame, IWF sends MAP SRI-LCS (sending routing iinformation-location-based service) request to HLR.This request can use IMSI (International Mobile Subscriber identity) or MSISDN (mobile radio station International Subscriber catalog number (Cat.No.)) to identify subscriber, this depend on the MAP from GMLC (GMLC) provide subscriber locations (PSL) ask in receive any one.Responsively, HLR sends the response comprising network node number (identifying new MSC) to IWF.The MAP PSL received from GMLC is relayed to the network node number that HLR returns by IWF.Realize the UE position process of regulation in 3GPP TS 23.271.MSC/VLR returns MAP PSL to IWF and responds.Then, PSL response is relayed to GMLC by IWF.
Fig. 8 illustrates newly to provide subscriber information, call flow chart to the embodiment of the rollback of CS process.MAP provides subscriber information (PSI) to be conventional process in CS network, and wherein VLR is asked to provide subscriber locations.As before, in this case, the MSC/VLR performing rollback be different from UE first rollback to MSC/VLR during CS.
Focus on the call flow part in square frame, IWF initiates CS rollback when MT calls out, then when receiving canceling position from HLR, assuming that the role of gsmSCF (GSM Service controll function), and send MAP hearing (AnyTim Interrogation any time to HLR, ATI) message, this HLR asks the same group of information mentioned in MAP PSI request message.Then, the MAP any time information of inquesting in the response of message is copied in the response of MAP PSI request message, and is sent to HLR thus completes this process.
Propose in the dependent claims especially below and be considered to novel feature of the present invention.But, for a person skilled in the art, to be apparent to the amendment of above-mentioned exemplary embodiment, variant and change, therefore, consumption-type parts (drain assembly) described here comprise such amendment, variant and change, and do not limit specific embodiment described here.
Claims (3)
1. a method, comprising:
In IWF (network interconnection function) network node place receiving mobility applying portion unstructured supplementary service data (MAP USSD) message, described MAP USSD message identifier applies the subscriber equipment (UE) started from USSD, described UE is associated with the first mobile switching centre (MSC);
Circuit switched fallback (CSFB) is initiated by sending paging request to described UE;
Receive the cancel location message be associated with described UE from attaching position register (HLR), described cancel location message indicates described UE to be associated with the 2nd MSC;
Via described HLR and described 2nd MSC, described MAP USSD message is forwarded to described UE;
MAP USSD response message is received from described UE via described HLR; And
Described MAP USSD response message is forwarded to described USSD apply.
2. a method, comprising:
Routing iinformation-location-based service (SRI-LCS) message is sent at IWF (network interconnection function) network node place receiving mobility applying portion, the subscriber equipment (UE) that described SRI-LCS message identifier starts from GMLC (GMLC), described UE is associated with the first mobile switching centre (MSC);
Circuit switched fallback (CSFB) is initiated by sending paging request to described UE;
Receive the cancel location message be associated with described UE from attaching position register (HLR), described cancel location message indicates described UE to be associated with the 2nd MSC;
Via described HLR and described 2nd MSC, described SRI-LCS message is forwarded to described UE;
SRI-LCS response message is received from described HLR;
Subscriber locations (PSL) message is provided by MAP to be sent to described 2nd MSC;
MAP PSL response message is received from described 2nd MSC; And
Described MAP PSL response message is forwarded to described GMLC.
3. a method, comprising:
At IWF (network interconnection function) network node place, receiving mobility applying portion provides subscriber information (MAP PSI) message, the subscriber equipment (UE) that described MAP PSI message identifier starts from attaching position register (HLR), described UE is associated with the first mobile switching centre (MSC);
Circuit switched fallback (CSFB) is initiated by sending paging request to described UE;
Receive the cancel location message be associated with described UE from described HLR, described cancel location message indicates described UE to be associated with the 2nd MSC;
Via described HLR and described 2nd MSC, MAP is inquested (ATI) message any time and be sent to described UE;
MAP ATI response message is received from described HLR; And
Information in being responded by described MAP ATI in MAP PSI response message is forwarded to described HLR.
Applications Claiming Priority (5)
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| PCT/US2012/039641 WO2012162636A1 (en) | 2011-05-26 | 2012-05-25 | Internetworking for circuit switched fallback |
| IN2412/CHE/2012 | 2012-06-18 | ||
| IN2412CH2012 | 2012-06-18 | ||
| PCT/US2012/051001 WO2013176692A1 (en) | 2012-05-25 | 2012-08-15 | Internetworking for circuit switched fallback-network initiated ussd request/notification procedure mobile-terminated location request procedure provide subscriber information procedure |
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| US9584553B2 (en) | 2013-06-28 | 2017-02-28 | Qualcomm Incorporated | User experience of a voice call associated with a device |
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| EA201401318A1 (en) | 2015-04-30 |
| AU2012381036B2 (en) | 2017-06-29 |
| CL2014003203A1 (en) | 2015-07-24 |
| MX346933B (en) | 2017-04-05 |
| EP2856792A1 (en) | 2015-04-08 |
| EP2856792A4 (en) | 2015-12-23 |
| CN104509150B (en) | 2018-05-04 |
| ZA201409360B (en) | 2015-11-25 |
| JP2015521005A (en) | 2015-07-23 |
| AU2012381036A1 (en) | 2015-01-22 |
| KR20150028779A (en) | 2015-03-16 |
| MX2014014406A (en) | 2015-06-23 |
| WO2013176692A1 (en) | 2013-11-28 |
| BR112014029399A2 (en) | 2017-06-27 |
| JP6115972B2 (en) | 2017-04-19 |
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