Apparatus, system, and method for notifying a mobile station of an incoming circuit switched call during a packet switched session

Apparatus, system, and method for notifying a mobile station of an incoming circuit switched call during a packet switched session. During the packet switched session, a mobile station may receive a call notification of the circuit switched call. The call notification may be received via a packet switched network associated with the packet switched session. Additionally, the call notification may identify a calling party. In response, an indication of the circuit switched call may be displayed to a user on a display of the mobile station. This indication of the circuit switched call may identify the calling party. Additionally, the indication may be displayed while maintaining the packet switched session. In response, the user may provide input to the mobile station regarding whether to accept the circuit switched call. Based on this input, the mobile station may accept or reject the circuit switched call.

FIELD OF THE DISCLOSURE

The present application relates to wireless communication, and more particularly to an apparatus, system, and method for receiving an indication of an incoming circuit switched call during a packet switched session.

DESCRIPTION OF THE RELATED ART

Wireless communication systems are rapidly growing in usage. Further, wireless communication technology has evolved from voice-only communications to also include the transmission of data, such as Internet and multimedia content.

Some present wireless communication devices (e.g., cell phones) communicate between two or more wireless communication technologies, e.g., using a single radio. For example, these devices may communicate using packet switched networks and circuit switched networks, e.g., GSM and LTE, respectively. Currently, if the device is communicating in a packet switched session and an incoming circuit switched call occurs, caller information of the incoming call cannot be sent to the device without interrupting the packet switched session.

SUMMARY

Various embodiments are described of an apparatus, system, and method for providing an indication of an incoming circuit switched call during a packet switched session.

In particular, in one embodiment, during the packet switched session, a mobile station may receive a call notification of the circuit switched call. The call notification may be received via a packet switched network associated with the packet switched session. Additionally, the call notification may identify a calling party. In response, an indication of the circuit switched call may be displayed to a user on a display of the mobile station. This indication of the circuit switched call may identify the calling party. Additionally, the indication may be displayed while maintaining the packet switched session. In response, the user may provide input to the mobile station regarding whether to accept the circuit switched call. Based on this input, the mobile station may accept or reject the circuit switched call.

In one embodiment, a user equipment device (UE) may include a display, a first radio configured to perform wireless communication, and a processing element coupled to the first radio and the display. The UE may be configured to, during a packet switched session, receive a call notification of a circuit switched call from a network controller. The call notification may be received via a packet switched network associated with the packet switched session. Additionally, the call notification may include information identifying a calling party. The UE may be further configured to display an indication of the circuit switched call to a user on the display of the mobile station. The indication of the circuit switched call may identify the calling party. Additionally, while displaying the indication, the packet switched session may be maintained. The UE may be configured to receive user input accepting the circuit switched call. Finally, the circuit switched call may be established using a circuit switched network. Establishing the circuit switched call may include tuning the first radio from the packet switched network to the circuit switched network.

In one embodiment, a network controller of a packet switched network and a circuit switched network may include communication circuitry and a processing element coupled to the communication circuitry. The processing element and the communication circuitry may be configured to: during a packet switched session with a user equipment device (UE), receive an indication of an incoming circuit switched call from a calling party to the UE. In response to the indication of the incoming circuit switched call, the network controller may provide a call notification to the UE via a packet switched network associated with the packet switched session. The call notification may include information identifying the calling party. The network controller may receive an indication from the UE indicating acceptance of the circuit switched call. The network controller may establish the circuit switched call between the UE and the calling party using a circuit switched network.

The techniques described herein may be implemented in and/or used with a number of different types of devices, including but not limited to cellular phones, portable media players, portable gaming devices, tablet computers, wearable computing devices, remote controls, wireless speakers, set top box devices, television systems, and computers.

DETAILED DESCRIPTION

Acronyms

The following acronyms are used in the present disclosure.

3GPP: Third Generation Partnership Project

3GPP2: Third Generation Partnership Project 2

GSM: Global System for Mobile Communications

UMTS: Universal Mobile Telecommunications System

TDS: Time Division Synchronous Code Division Multiple Access

LTE: Long Term Evolution

RAT: Radio Access Technology

Terms

FIG. 1illustrates an example user equipment (UE)106according to one embodiment. The term UE106may be any of various devices as defined above. UE device106may include a housing12which may be constructed from any of various materials. UE106may have a display14, which may be a touch screen that incorporates capacitive touch electrodes. Display14may be based on any of various display technologies. The housing12of the UE106may contain or comprise openings for any of various elements, such as home button16, speaker port18, and other elements (not shown), such as microphone, data port, and possibly various other types of buttons, e.g., volume buttons, ringer button, etc.

The UE106may support multiple radio access technologies (RATs). For example, UE106may be configured to communicate using any of various RATs such as two or more of Global System for Mobile Communications (GSM), Universal Mobile Telecommunications System (UMTS), Code Division Multiple Access (CDMA) (e.g., CDMA2000 1×RTT or other CDMA radio access technologies), Time Division Synchronous Code Division Multiple Access (TD-SCDMA or TDS), Long Term Evolution (LTE), Advanced LTE, and/or other RATs. For example, the UE106may support at three RATs, such as GSM, TDS, and LTE. Various different or other RATs may be supported as desired.

The UE106may comprise one or more antennas. The UE106may also comprise any of various radio configurations, such as various combinations of one or more transmitter chains (TX chains) and one or more receiver chains (RX chains). For example, the UE106may comprise a radio that supports two or more RATs. The radio may comprise a single TX (transmit) chain and a single RX (receive) chain. Alternatively, the radio may comprise a single TX chain and two RX chains, e.g., that operate on the same frequency. In another embodiment, the UE106comprises two or more radios, i.e., two or more TX/RX chains (two or more TX chains and two or more RX chains).

The UE106may comprise two antennas which may be used to communicate using two or more RATs. For example, the UE106may have a pair of cellular telephone antennas coupled to a single radio or shared radio. The antennas may be coupled to the shared radio (shared wireless communication circuitry) using switching circuits and other radio-frequency front-end circuitry. For example, the UE106may have a first antenna that is coupled to a transceiver or radio, i.e., a first antenna that is coupled to a transmitter chain (TX chain) for transmission and which is coupled to a first receiver chain (RX chain) for receiving. The UE106may also comprise a second antenna that is coupled to a second RX chain. The first and second receiver chains may share a common local oscillator, which means that both of the first and second receiver chains tune to the same frequency. The first and second receiver chains may be referred to as the primary receiver chain (PRX) and the diversity receiver chain (DRX).

In one embodiment, the PRX and DRX receiver chains operate as a pair and time multiplex among two or more RATs, such as LTE and one or more other RATs such as GSM or CDMA1×. In the primary embodiment described herein the UE106comprises one transmitter chain and two receiver chains (PRX and DRX), wherein the transmitter chain and the two receiver chains (acting as a pair) time multiplex between two (or more) RATs, such as LTE and GSM.

Each antenna may receive a wide range of frequencies such as from 600 MHz up to 3 GHz. Thus, for example, the local oscillator of the PRX and DRX receiver chains may tune to a specific frequency such as an LTE frequency band, where the PRX receiver chain receives samples antenna1and the DRX receiver chain receives samples from antenna2, both on the same frequency (since they use the same local oscillator). The wireless circuitry in the UE106can be configured in real time depending on the desired mode of operation for the UE106.

FIG. 2illustrates an exemplary (and simplified) wireless communication system. It is noted that the system ofFIG. 2is merely one example of a possible system, and embodiments may be implemented in any of various systems, as desired.

As shown, the exemplary wireless communication system includes base stations102A and102B which communicate over a transmission medium with one or more user equipment (UE) devices, represented as UE106. The base stations102may be base transceiver stations (BTS) or cell sites, and may include hardware that enables wireless communication with the UE106. Each base station102may also be equipped to communicate with a core network100. For example, base station102A may be coupled to core network100A, while base station102B may be coupled to core network100B. Each core network may be operated by a respective cellular service provider, or the plurality of core networks100A may be operated by the same cellular service provider. Each core network100may also be coupled to one or more external networks (such as external network108), which may include the Internet, a Public Switched Telephone Network (PSTN), and/or any other network. Thus, the base stations102may facilitate communication between the UE devices106and/or between the UE devices106and the networks100A,100B, and108.

The base stations102and the UEs106may be configured to communicate over the transmission medium using any of various radio access technologies (“RATs”, also referred to as wireless communication technologies or telecommunication standards), such as GSM, UMTS (WCDMA), TDS, LTE, LTE Advanced (LTE-A), 3GPP2 CDMA2000 (e.g., 1×RTT, 1×EV-DO, HRPD, eHRPD), IEEE 802.11 (WLAN or Wi-Fi), IEEE 802.16 (WiMAX), etc.

Base station102A and core network100A may operate according to a first RAT (e.g., LTE) while base station102B and core network100B may operate according to a second (e.g., different) RAT (e.g., GSM, TDS, CDMA 2000 or other legacy or circuit switched technologies). The two networks may be controlled by the same network operator (e.g., cellular service provider or “carrier”), or by different network operators, as desired. In addition, the two networks may be operated independently of one another (e.g., if they operate according to different RATs), or may be operated in a somewhat coupled or tightly coupled manner.

Note also that while two different networks may be used to support two different RATs, such as illustrated in the exemplary network configuration shown inFIG. 2, other network configurations implementing multiple RATs are also possible. As one example, base stations102A and102B might operate according to different RATs but couple to the same core network. As another example, multi-mode base stations capable of simultaneously supporting different RATs (e.g., LTE and GSM, LTE and TDS, LTE and GSM and TDS, and/or any other combination of RATs) might be coupled to a network or service provider that also supports the different cellular communication technologies. In one embodiment, the UE106may be configured to use a first RAT that is a packet-switched technology (e.g., LTE) and a second RAT that is a circuit-switched technology (e.g., GSM or TDS).

As discussed above, UE106may be capable of communicating using multiple RATs, such as those within 3GPP, 3GPP2, or any desired cellular standards. The UE106might also be configured to communicate using WLAN, Bluetooth, one or more global navigational satellite systems (GNSS, e.g., GPS or GLONASS), one and/or more mobile television broadcasting standards (e.g., ATSC-M/H or DVB-H), etc. Other combinations of network communication standards are also possible.

Base stations102A and102B and other base stations operating according to the same or different RATs or cellular communication standards may thus be provided as a network of cells, which may provide continuous or nearly continuous overlapping service to UE106and similar devices over a wide geographic area via one or more radio access technologies (RATs).

FIG. 3illustrates an exemplary block diagram of a base station102. It is noted that the base station ofFIG. 3is merely one example of a possible base station. As shown, the base station102may include processor(s)504which may execute program instructions for the base station102. The processor(s)504may also be coupled to memory management unit (MMU)540, which may be configured to receive addresses from the processor(s)504and translate those addresses to locations in memory (e.g., memory560and read only memory (ROM)550) or to other circuits or devices.

The base station102may include at least one network port570. The network port570may be configured to couple to a telephone network and provide a plurality of devices, such as UE devices106, access to the telephone network as described above.

The base station102may include at least one antenna534. The at least one antenna534may be configured to operate as a wireless transceiver and may be further configured to communicate with UE devices106via radio530. The antenna534communicates with the radio530via communication chain532. Communication chain532may be a receive chain, a transmit chain or both. The radio530may be configured to communicate via various RATs, including, but not limited to, LTE, GSM, TDS, WCDMA, CDMA2000, etc.

The processor(s)504of the base station102may be configured to implement part or all of the methods described herein, e.g., by executing program instructions stored on a memory medium (e.g., a non-transitory computer-readable memory medium). Alternatively, the processor504may be configured as a programmable hardware element, such as an FPGA (Field Programmable Gate Array), or as an ASIC (Application Specific Integrated Circuit), or a combination thereof.

FIG. 4illustrates an example simplified block diagram of a UE106. As shown, the UE106may include a system on chip (SOC)400, which may include portions for various purposes. The SOC400may be coupled to various other circuits of the UE106. For example, the UE106may include various types of memory (e.g., including NAND flash410), a connector interface420(e.g., for coupling to a computer system, dock, charging station, etc.), the display460, cellular communication circuitry430such as for LTE, GSM, TDS, CDMA, etc., and short range wireless communication circuitry429(e.g., Bluetooth and WLAN circuitry). The UE106may further comprise one or more smart cards310that comprise SIM (Subscriber Identity Module) functionality, such as one or more UICC(s) (Universal Integrated Circuit Card(s)) cards310. The cellular communication circuitry430may couple to one or more antennas, preferably two antennas435and436as shown. The short range wireless communication circuitry429may also couple to one or both of the antennas435and436(this connectivity is not shown for ease of illustration).

As shown, the SOC400may include processor(s)402which may execute program instructions for the UE106and display circuitry404which may perform graphics processing and provide display signals to the display460. The processor(s)402may also be coupled to memory management unit (MMU)440, which may be configured to receive addresses from the processor(s)402and translate those addresses to locations in memory (e.g., memory406, read only memory (ROM)450, NAND flash memory410) and/or to other circuits or devices, such as the display circuitry404, cellular communication circuitry430, short range wireless communication circuitry429, connector I/F420, and/or display460. The MMU440may be configured to perform memory protection and page table translation or set up. In some embodiments, the MMU440may be included as a portion of the processor(s)402.

In one embodiment, as noted above, the UE106comprises at least one smart card310, such as a UICC310, which executes one or more Subscriber Identity Module (SIM) applications and/or otherwise implement SIM functionality. The at least one smart card310may be only a single smart card310, or the UE106may comprise two or more smart cards310. Each smart card310may be embedded, e.g., may be soldered onto a circuit board in the UE106, or each smart card310may be implemented as a removable smart card. Thus the smart card(s)310may be one or more removable smart cards (such as UICC cards, which are sometimes referred to as “SIM cards”), and/or the smart card(s)310may be one or more embedded cards (such as embedded UICCs (eUICCs), which are sometimes referred to as “eSIMs” or “eSIM cards”). In some embodiments (such as when the smart card(s)310include an eUICC), one or more of the smart card(s)310may implement embedded SIM (eSIM) functionality; in such an embodiment, a single one of the smart card(s)310may execute multiple SIM applications. Each of the smart card(s)310may include components such as a processor and a memory; instructions for performing SIM/eSIM functionality may be stored in the memory and executed by the processor. In one embodiment, the UE106may comprise a combination of removable smart cards and fixed/non-removable smart cards (such as one or more eUICC cards that implement eSIM functionality), as desired. For example, the UE106may comprise two embedded smart cards310, two removable smart cards310, or a combination of one embedded smart card310and one removable smart card310. Various other SIM configurations are also contemplated.

As noted above, in one embodiment, the UE106comprises two or more smart cards310, each implementing SIM functionality. The inclusion of two or more SIM smart cards310in the UE106may allow the UE106to support two different telephone numbers and may allow the UE106to communicate on corresponding two or more respective networks. For example, a first smart card310may comprise SIM functionality to support a first RAT such as LTE, and a second smart card310may comprise SIM functionality to support a second RAT such as GSM or CDMA. Other implementations and RATs are of course possible. Where the UE106comprises two smart cards310, the UE106may support Dual SIM Dual Active (DSDA) functionality. The DSDA functionality may allow the UE106to be simultaneously connected to two networks (e.g., and use two different RATs) at the same time. The DSDA functionality may also allow the UE106may to simultaneously receive voice calls or data traffic on either phone number. In another embodiment, the UE106supports Dual SIM Dual Standby (DSDS) functionality. The DSDS functionality may allow either of the two smart cards310in the UE106to be on standby waiting for a voice call and/or data connection. In DSDS, when a call/data is established on one SIM310, the other SIM310is no longer active. In one embodiment, DSDx functionality (either DSDA or DSDS functionality) may be implemented with a single smart card (e.g., a eUICC) that executes multiple SIM applications for different carriers and/or RATs.

As noted above, the UE106may be configured to communicate wirelessly using multiple radio access technologies (RATs). As further noted above, in such instances, the cellular communication circuitry (radio(s))430may include radio components which are shared between multiple RATS and/or radio components which are configured exclusively for use according to a single RAT. Where the UE106comprises at least two antennas, the antennas435and436may be configurable for implementing MIMO (multiple input multiple output) communication.

As described herein, the UE106may include hardware and software components for implementing features for communicating using two or more RATs, such as those described herein. The processor402of the UE device106may be configured to implement part or all of the features described herein, e.g., by executing program instructions stored on a memory medium (e.g., a non-transitory computer-readable memory medium). Alternatively (or in addition), processor402may be configured as a programmable hardware element, such as an FPGA (Field Programmable Gate Array), or as an ASIC (Application Specific Integrated Circuit). Alternatively (or in addition) the processor402of the UE device106, in conjunction with one or more of the other components400,404,406,410,420,430,435,440,450,460may be configured to implement part or all of the features described herein.

FIGS. 5-7—Exemplary System with Packet and Circuit Switched Communication

FIG. 5illustrates an exemplary system where a mobile station (or UE)502, e.g., with limited radio capabilities, such as a single radio for communicating with multiple RATs, is currently in a packet switched session with another party510over a packet switched network504. As shown, the bearer path between the two parties is through the data network (e.g., comprising the packet switched (PS) network504). Additionally, a signaling path is also through this network504and to the other party510, but via a network controller508.FIG. 5also illustrates a circuit switched network506(e.g., a 1× circuit switched network), that is not currently in use. Additionally, there is a voice call originator512that is also not yet used.

The packet switched network504and the circuit switched network506may be any of various types of networks. For example, the packet switched network may be an LTE or eHRPD network. Additionally, the circuit switched network may be a CDMA, CDMA2000, 1×RTT, GSM, etc.

FIG. 6illustrates the same system, where the voice call originator512has initiated a call to the mobile station or terminal502. As shown, an indication of the voice call is provided via the packet switched network504, through the network controller508. This indication of the voice call may include information identifying the calling party, e.g., caller ID information, that would not otherwise be available to the called party if the call notification were sent through the circuit switched network.

FIG. 7illustrates the same system, where the called party502has accepted the call. In this case, the call is now performed over the circuit switched network506rather than the packet switched network504. The previous packet switched session has been torn down. As shown, the bearer path is through the circuit switched network506as well as the signaling path, except that the signaling path also includes the network controller508.

FIG. 8—Receiving an Indication of a Circuit Switched Call During a Packet Switched Session

FIG. 8illustrates an exemplary method, e.g., performed by a mobile station, for receiving an indication of a circuit switched call during a packet switched session. The method shown inFIG. 8may be used in conjunction with any of the computer systems or devices shown in the above Figures, among other devices. In various embodiments, some of the method elements shown may be performed concurrently, in a different order than shown, or may be omitted and/or considered optional. Additional method elements may also be performed as desired. As shown, this method may operate as follows.

Initially, in802, the mobile station may communicate with another party (“the packet switched party”) in a packet switched session over a packet switched network. In one embodiment, the mobile station (or handset) is configured to operate in (but not limited to) a high priority traffic mode, e.g., for high priority data such as a VOIP, videoconferencing, or other high priority or real time traffic sessions. For example, the mobile station may be engaged in a packet switched video telephony (PSVT) session.

Next, in804, the mobile station may receive a call notification of an incoming circuit switched call from a calling party (“the circuit switched party”) from a network controller. For example, the mobile station may receive an application layer “CS Voice Call Notification with Alert Information” from an HRPD (“High Rate Packet Data”) network controller. The notification may be a session initiation protocol (SIP) notification, or may use any other appropriate signaling protocol, such as a proprietary signaling protocol, as desired. The call notification may include caller ID information of the circuit switched party.

Next, in806, the mobile station may determine if it can acquire the circuit switched network (e.g., perform CDMA 2000 1× acquisition).

If the mobile station cannot, in808, then the handset may automatically (e.g., silently) send an acknowledgement (ACK) to the network controller with an “Unable to Accept CS Voice Call” indication. Accordingly, an appropriate notification or announcement may be provided to the circuit switched party.

If the mobile station can acquire the circuit switched network, in810, then the mobile station may send an ACK including an “Able to Accept CS Voice Call” indication to the network controller. Accordingly, a ring back (or other appropriate notification) may be provided to the circuit switched party.

Additionally, in812, the mobile station may display an indication of the circuit switched call on a display of the mobile station. This indication may provide caller ID information of the circuit switched party. Additionally, the mobile station may maintain the packet switched session or connection while displaying this indication.

At this point, in812, the user may choose to accept or reject the incoming call. Accordingly, continuing to816, the mobile station may receive user input indicating acceptance of the call. Alternatively, in814, the mobile station may receive user input rejecting the call. In another case, the user may simply ignore the call, letting the call go to voice mail.

If the user does not accept the call, in814, a notification may be sent to the packet switched network, e.g., to the network controller. For example, an application layer “CS Voice Call Declined” notification may be sent. In this case, the mobile station may continue to communicate in the packet switched session.

If the user does accept the call, in816, an indication may be sent to the packet switched network, e.g., to the network controller. For example, an application layer “CS Voice Call Accepted” notification may be sent. In addition, the mobile station may hold or terminate the packet switched application or session, and tune its radio (e.g., its single radio) to the circuit switched network. Where the mobile station is able to concurrently perform the circuit switched call and the packet switched session, e.g., by using multiple radios or time sharing the single radio, it may do so, if desired.

Depending on the mobile station or network, accepting the call may be handled in different manners, as indicated in818. For example, the network may indicate a desired scheme in the call notification described above. Alternatively, or additionally, the mobile device may have a preconfigured method for handling the circuit switched call.

Depending on these factors, in820, the mobile station may send an origination message, using origination setup procedures. Then, the network node may bind the CS call. Alternatively, in822, the network (e.g., the circuit switched network) may send a page message and follow call termination setup procedures. In this case, the network node may bind the circuit switched call. Additionally, the mobile station may be configured to ignore (e.g., silently) an “Alert with Info” message and send a “MS ACK Order” and “Connect Order” message, as desired.

FIG. 9—Providing an Indication of a Circuit Switched Call During a Packet Switched Session

FIG. 9illustrates an exemplary method, e.g., performed by a network controller, for providing an indication of a circuit switched call during a packet switched session. The method shown inFIG. 9may be used in conjunction with any of the computer systems or devices shown in the above Figures, among other devices. In various embodiments, some of the method elements shown may be performed concurrently, in a different order than shown, or may be omitted and/or considered optional. Additional method elements may also be performed as desired. As shown, this method may operate as follows.

Similar toFIG. 8, in902, a mobile station may be involved in a packet switched session with a packet switched party. While the mobile station is in this session, in904, an incoming circuit switched call from a circuit switched party may be received. In the example embodiment ofFIG. 9, the mobile station may be in an active or connected state over HRPD network and an incoming CS voice call may arrive at the network controller.

In response, in904, call information (e.g., including caller ID information) may be forwarded to the mobile station over the packet switched network, e.g., via application layer call signaling (e.g., SIP or any proprietary signaling).

In906, If the handset does not respond and/or does not have acquisition of the circuit switched network, in908, a notification or message may be sent to the circuit switched party that the mobile station is unreachable.

If the handset does respond and is able to acquire the circuit switched network, in910, an indication (e.g., a ring back) may be provided to the circuit switched party by the network controller. Then, the method may wait for the mobile station to accept or decline the call in912.

If the call is not accepted, in914, the circuit switched party may be informed.

If the call is accepted, in916, the call may be set up, e.g., according to origination or page schemes, similar to the description ofFIG. 8above.

FIGS. 10 and 11—Exemplary Message Flow for Call Origination Scheme

FIGS. 10 and 11illustrate exemplary message flow diagrams, e.g., corresponding to the exemplary methods ofFIGS. 8 and 9, according to an exemplary call origination scheme. As shown, these flow diagrams involve a terminal1002, PS network1004, CS network1006, network controller1008, another IP party1010, and a voice call originator1012.

In Stage 1, an IP session1014may be in progress between the terminal and the other IP party1010of the IP session, via the network controller1008and the PS network1004, as shown. In some embodiments the IP session may be a VOIP or PSVT call, as desired.

In Stage 2, an incoming voice call is provided from the voice call originator originator1012to the network controller1008. As shown, the voice call may originate from the voice call originator1012, and may involve signaling or message(s)1016to the network controller. In response, the network controller1008may provide an incoming voice call notification with caller ID1018to the terminal1002via the PS network1004.

In response, the mobile station may provide an acknowledgement1020indicating the user is informed and that the call may be answered over the circuit switched network1006. This message1020may similarly be transmitted through the PS network1004to the network controller1008. The network controller1008may then provide a ringback or announcement1022to the voice call originator1012.

If the user answers the call, the mobile station may provide an indication1024that the user answered the call to the network controller1008, via the PS network1004.

At this point, the IP session between the mobile station and the other party may be torn down, as indicated by1026.

After the optional teardown1026, the terminal1002may tune from the packet switched network1004to the circuit switched network1006.

In stage 3, according toFIG. 10, the mobile station may provide a call origination message1028to the network controller to set up the voice call, via the circuit switched network1006(e.g., a 1× circuit switched network). Alternatively, as shown inFIG. 11, the paging scheme may be used, where a page1128is provided to the terminal1002from the network controller1008via the circuit switched network1006.

After, the circuit switched call may be set up in1030, using the circuit switched network1006, as shown.

WhileFIGS. 5-11are described as applying to CDMA 2000, they may apply to any desired RAT, e.g., any desired circuit switched network.

Embodiments of the described herein may be realized in any of various forms. For example, the systems and methods described herein may be realized as a computer-implemented method, a computer-readable memory medium, or a computer system. Alternatively, the systems and methods described herein may be realized using one or more custom-designed hardware devices such as ASICs. As another alternative, the systems and methods described herein may be realized using one or more programmable hardware elements such as FPGAs. The systems and methods described herein may also be implemented using any combination of the above.