WO2001050804A1 - Redirection at terminating call setup for dual-mode mobile stations operating through radio access networks having non-integrated air interface standards - Google Patents

Redirection at terminating call setup for dual-mode mobile stations operating through radio access networks having non-integrated air interface standards Download PDF

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Publication number
WO2001050804A1
WO2001050804A1 PCT/SE2000/002583 SE0002583W WO0150804A1 WO 2001050804 A1 WO2001050804 A1 WO 2001050804A1 SE 0002583 W SE0002583 W SE 0002583W WO 0150804 A1 WO0150804 A1 WO 0150804A1
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WIPO (PCT)
Prior art keywords
radio access
access network
mobile station
network
amps
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Application number
PCT/SE2000/002583
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French (fr)
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WO2001050804A9 (en
Inventor
Francois Sawyer
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
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Filing date
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Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to AU27187/01A priority Critical patent/AU2718701A/en
Publication of WO2001050804A1 publication Critical patent/WO2001050804A1/en
Publication of WO2001050804A9 publication Critical patent/WO2001050804A9/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network

Definitions

  • the present invention relates to cellular telephone networks and, in particular, to the terminating call setup activities in order to support the operation of dual-mode mobile stations.
  • wireless cellular communications have historically utilized the advanced mobile phone service (AMPS), the digital advanced mobile phone services (D-AMPS), the global system for mobile (GSM) communications, and the code division multiple access (CDMA) communications access types.
  • AMPS advanced mobile phone service
  • D-AMPS digital advanced mobile phone services
  • GSM global system for mobile
  • CDMA code division multiple access
  • newer technologies for access that are either being proposed for deployment, or have already been deployed, include Pacific Digital Cellular (PDC), wideband code division multiple access (W-CDMA), cellular digital packet data (CDPD), general packet radio service (GPRS), and Enhanced Data rates for Global Evolution (EDGE) communications access types.
  • PDC Pacific Digital Cellular
  • W-CDMA wideband code division multiple access
  • CDPD cellular digital packet data
  • GPRS general packet radio service
  • EDGE Enhanced Data rates for Global Evolution
  • multi-mode or multi-type terminals.
  • certain combinations of communications access types utilize air interface standards that are integrated within the same radio access network.
  • a corresponding multi-mode mobile station may utilize the same or a compatible air interface standard (for example, IS- 136 for the AMPS/DAMPS combination) within the same supporting radio network for each of the plural available communications access types.
  • a compatible air interface standard for example, IS- 136 for the AMPS/DAMPS combination
  • the instances of plural communications access types failing to share an integrated air interface standard may in the future far out number the instances like those mentioned above where such integration is supported.
  • the newer communications access types that are now available, or are soon to become available, are typically designed to utilize their own unique air interfaces (within their own corresponding radio access networks), and the newer access types typically are not compatible with each other or with any of the widely available, legacy, communications access types (like AMPS, D-AMPS, GSM, and CDMA). These communications access types are therefore referred to as having "non-integrated" air interface standards.
  • mobile station manufacturers have begun (and in some instances completed) the design, development and production processes necessary to offer for sale multi-mode mobile stations that support multiple communications access types whose air interface standards are currently non-integrated within the same radio access network. These mobile stations are most commonly used to support international roaming. Take, for example, the case of a multi-mode mobile station supporting both D-
  • AMPS and CDPD communications access types are, at the moment, non-integrated with respect to their air interface standards. If that multi-mode mobile station is active and registered for communication within the D- AMPS network utilizing its supported D-AMPS communications access type and IS- 136 air interface, and a far end user in the Internet attempts to send an e-mail message to that mobile station, delivery of that message would fail due to non-integration concerns because packet mode e-mail message delivery is a supported service within the CDPD communications network, air interface standard and radio access network, but is not supported by the D-AMPS communications access type and its associated air interface standard (IS- 136) and radio access network.
  • IS- 136 air interface standard
  • a wireless communications network includes plural radio access networks having non-integrated air interface standards.
  • a multi-mode mobile station is serviced and is capable of operation within each of those radio access networks. Responsive to an incoming call request, the wireless communications network locates the mobile station currently being served within a first one of those radio access networks. Recognizing that delivery of the incoming call (or data message) to the mobile station would require use of a second one of those radio access networks, the wireless communications network redirects the mobile station from use of the first radio access to instead make an access the second radio access network. In response to this access, the second radio access network provides the necessary routing information to enable delivery of the incoming call (message) to the mobile station through the second radio access network.
  • FIGURE 1 is a block diagram of a wireless communications network having plural radio access networks with non-integrated air interface standards
  • FIGURE 2 is a signal flow and node operation diagram illustrating the flow of signals in connection with the redirection of a terminating call setup between the plural radio access networks and a multi-mode mobile station.
  • FIGURE 1 wherein there is shown a block diagram of a wireless communications network 10 including a first type radio access network 12 and a second type radio access network 14.
  • the first radio access network 12 supports mobile station 16 communications utilizing a corresponding first air interface standard for a first communications access type.
  • the second radio access network 12 supports mobile station 16 communications utilizing a corresponding second air interface standard for a second communications access type.
  • the first and second air interface standards are "non-integrated" in the manner defined above.
  • some examples (not all-inclusive) of such first and second communications access types having non-integrated air interface standards requiring the use of different radio access networks 12 and 14 are as follows : First Type Second Type
  • the first and second radio access networks 12 and 14 preferably (but not necessarily) are connected to the same core network infrastructure.
  • the wireless communications network 10 includes and preferably shares a home location register 18 that stores information concerning the mobile stations 16 comprising, for example, location information and service information.
  • the first and second radio access networks 12 and 14 may further, but not necessarily, share a network access, or "gateway", node 20 that serves as the interface point for signaling and communications between the wireless communications network 10 and other communications networks like the public switched telephone network (PSTN), the PSTN.
  • PSTN public switched telephone network
  • the gateway node 20 and the radio access networks 12 and 14 are connected to the home location register 18 by means of signaling links 22 providing a known connection, such as (for example) a Mobile Application Part (MAP) or ANSI-41 type connection.
  • the gateway node 20 is connected to the radio access networks 12 and 14 via both trunk connections 24 (illustrated with broken lines) and signaling links 22 (illustrated with solid lines) providing a known connection, such as (for example) an ISUP, TUP, MAP, ANSI-41 or Rl or R2 type connection.
  • Each radio access network 12 and 14 includes one or more (if not many network interconnected) serving nodes 26 that support the provision of communications services to mobile stations 16 currently registered to receive service within that particular network.
  • serving nodes 26 may generally comprise, for example, switching nodes (such as mobile switching centers - MSCs) and radio nodes (such as base stations - BSs) as well as other specific nodes needed for the provision of communications services within that particular network 12 and 14 such as visitor location registers (VLRs), service control points (SCPs), radio network controllers
  • VLRs visitor location registers
  • SCPs service control points
  • FIGURE 2 is a signal flow and node operation diagram illustrating the flow of signals in connection with a specific example of the redirection of a terminating call setup between the plural radio access networks and a multi-mode mobile station.
  • the first radio access network is assumed to comprise a D-AMPS cellular communications network and the second radio access network is assumed to comprise a CDPD wireless communications network.
  • the D-AMPS and CDPD air interface standards are non- integrated.
  • the mobile station 16 has registered with and is currently being served by the (first) D-AMPS radio access network.
  • a data delivery message 100 sent to the address of the mobile station 16(1) originates from a far end user in, for example, the Internet and is received at the gateway node 20. It is recognized by the gateway node 20 that the data delivery message, due to non-integrated air interface standards within the first and second radio access networks 12 and 14, must be delivered through the (second) CDPD radio access network. The gateway node 20 then interrogates the home location register 18 with a location request (send routing) message 102 that includes an indication (parameter
  • the location request (send routing) message 102 is processed by the home location register 20 to determine the current registration mode (D-AMPS) and the current switching node 26(1) within the (first) D-AMPS radio access network 12 currently believed to be serving the addressee mobile station 16.
  • D-AMPS current registration mode
  • D-AMPS current switching node 26(1) within the (first) D-AMPS radio access network 12 currently believed to be serving the addressee mobile station 16.
  • the home location register 20 then signals the serving mobile switching center 26(1) for the addressee mobile station 16 with a routing request (provide roaming) message 104 that also includes an indication (parameter CDPD) that the (second) CDPD radio access network 14 is requested for delivery of the message 100.
  • the currently serving service node 26(1 ) determines a location of the addressee mobile station 16. This location may be identified, for example, based on information resulting from a most recent registration (not shown) of the addressee mobile station 16.
  • a page acknowledgment 110 is then sent from the mobile station 16 back to the service node 26(1).
  • the currently serving service node 26(1) responds to the page acknowledgment 110 by sending a redirection request message 112 to addressee mobile station 16 that includes an indication (parameter CDPD) that the mobile station should make an access in the (second) CDPD radio access network 14.
  • the addressee mobile station 16 switches operation over to the (second) CDPD radio access network in action 114 and sends a page acknowledgment 116 to the service node 26(2) currently serving the mobile station in that second network, the page acknowledgment including the mobile station identity.
  • the currently serving service node 26(2) in the (second) CDPD radio access network 14 is unaware of why the mobile station 16 would be acknowledging a page since it had not previously paged for that mobile station. In this regard, it will be remembered that the page 108 instead had originated from service node 26(1) in the (first) radio access network 12.
  • the currently serving service node 26(2) analyzes the mobile station identity to determine the address of its HLR and then responds to the unsolicited page acknowledgment 116 by sending an unsolicited response message 118 to the home location register 18.
  • This unsolicited response message 118 includes an appropriate routing number for contacting the service node 26(2) that is currently serving the mobile station 16 in the (second) CDPD radio access network 14.
  • the selected routing number is then returned 120 to the gateway node 20.
  • the incoming message 100 is then delivered (through connected) 122 using the routing number to the service node 26(2) in the (second) CDPD radio access network 14. Delivery of the message 100 is completed sending
  • D- AMPS/CDPD dual-mode mobile station 16 initially operating within the D-AMPS network and redirected to access the CDPD network to complete call/message delivery
  • the general concepts of the present invention are equally applicable to any multi-mode scenario wherein the implicated radio access networks utilize non-integrated air interface standards.
  • the general concepts include: 1) gateway node locating of the mobile station with an indication of the radio access network required to complete delivery (see, messages 102 and 104), wherein the indication may specifically refer to a given radio access network, or the network may be inferred from destination identity type in the delivery message 100 (for example, an IP address instead of a PSTN routable number); 2) serving node redirection of the mobile station following a page response to switch operation and instead access the radio access network required to complete delivery (see, message 112); and 3) radio access network response to a non-requested mobile station network access by sending an unsolicited response message to the home location register providing the necessary routing information to make the delivery through the required radio access network (see, message 118).
  • the specific messages utilized to accomplish the locating, redirection and routing operations maybe uniquely specified for each wireless communications network, but the generic purpose of the messages important to the present invention will remain the same regardless of the specific nomenclature of the messages. It is important that consideration be given during the termination setup process to the specific multi-mode capabilities of the mobile station 16. In this regard, it would be a waste of network resources to proceed with termination setup or with a redirection instruction if the mobile station was not multi-mode capable with the particular radio access network required for delivery. To address this concern, the home location register 18 may, in response to the location request message 102, operate to verify 126 whether the mobile station is multi-mode capable with the radio access network required for delivery.
  • the home location register would verify from its stored subscription data whether the addressee mobile station 16 was CDPD capable. Only if found capable would the home location register 18 continue with the termination setup process and issue the routing request message 104.
  • the first radio access network 12 (through one of its service nodes 26) operates to verify 128 whether the mobile station is multi-mode capable with the radio access network required for delivery.
  • the mobile station 16 would acknowledge 110 the page 108 with an included indication (parameter) of its supported radio access networks (D-AMPS and CDPD).
  • the service node 26(1) would then verify from those included indications whether the addressee mobile station 16 was CDPD capable. Only if found capable would the service node 26(1) continue with the termination setup process and issue the redirection message 112.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A multi-mode mobile station (16) is operable within a wireless communications network (10) that includes plural radio access networks (12, 14) having non-integrated air interface standards. Responsive to an incoming call/message (100), the wireless communications network locates (102) the mobile station currently being served through a first one (26(1)) of those radio access networks, and provides an indication that use of a second one (26(2)) of the radio access network is required in order to deliver the incoming call/message. The first radio access network then issues a redirection request (112) message instructing the mobile station to switch (114) over to the second radio access network. Responsive to a mobile station access (116) in the second radio access network, routing information (120) is provided to the wireless communications network to enable delivery (122) of the incoming call/message to the mobile station through the second radio access network.

Description

REDIRECTION AT TERMINATING CALL SETUP FOR
DUAL-MODE MOBILE STATIONS OPERATING THROUGH RADIO
ACCESS NETWORKS HAVING NON-INTEGRATED AIR INTERFACE
STANDARDS
BACKGROUND OF THE INVENTION Technical Field of the Invention
The present invention relates to cellular telephone networks and, in particular, to the terminating call setup activities in order to support the operation of dual-mode mobile stations.
Description of Related Art
As wireless communications technology advances, newer communications access types are being proposed and even implemented. For example, wireless cellular communications have historically utilized the advanced mobile phone service (AMPS), the digital advanced mobile phone services (D-AMPS), the global system for mobile (GSM) communications, and the code division multiple access (CDMA) communications access types. With these recent advancements, however, newer technologies for access, that are either being proposed for deployment, or have already been deployed, include Pacific Digital Cellular (PDC), wideband code division multiple access (W-CDMA), cellular digital packet data (CDPD), general packet radio service (GPRS), and Enhanced Data rates for Global Evolution (EDGE) communications access types.
Concurrent with the advancements being made in new communications access types, advancements are also being made on the mobile terminal side to develop and produce mobile stations that are capable of operation using multiple ones of the available communications access types. These mobile stations are often referred to in the art as "multi-mode" or "multi-type" terminals. In some cases, such as with the AMPS and D-AMPS communications access types, or with the AMPS and CDMA communications access types, certain combinations of communications access types utilize air interface standards that are integrated within the same radio access network.
By "integrated" it is meant that a corresponding multi-mode mobile station may utilize the same or a compatible air interface standard (for example, IS- 136 for the AMPS/DAMPS combination) within the same supporting radio network for each of the plural available communications access types. The instances of plural communications access types failing to share an integrated air interface standard (within the same radio access network), however, may in the future far out number the instances like those mentioned above where such integration is supported. The newer communications access types that are now available, or are soon to become available, are typically designed to utilize their own unique air interfaces (within their own corresponding radio access networks), and the newer access types typically are not compatible with each other or with any of the widely available, legacy, communications access types (like AMPS, D-AMPS, GSM, and CDMA). These communications access types are therefore referred to as having "non-integrated" air interface standards. In spite of this non-integration phenomena on the network side, mobile station manufacturers have begun (and in some instances completed) the design, development and production processes necessary to offer for sale multi-mode mobile stations that support multiple communications access types whose air interface standards are currently non-integrated within the same radio access network. These mobile stations are most commonly used to support international roaming. Take, for example, the case of a multi-mode mobile station supporting both D-
AMPS and CDPD communications access types. These communications access types are, at the moment, non-integrated with respect to their air interface standards. If that multi-mode mobile station is active and registered for communication within the D- AMPS network utilizing its supported D-AMPS communications access type and IS- 136 air interface, and a far end user in the Internet attempts to send an e-mail message to that mobile station, delivery of that message would fail due to non-integration concerns because packet mode e-mail message delivery is a supported service within the CDPD communications network, air interface standard and radio access network, but is not supported by the D-AMPS communications access type and its associated air interface standard (IS- 136) and radio access network.
One obvious solution to this problem is to integrate the varying communications access types to utilize the same or compatible air interface standard within a single radio access network (like that currently provided with respect to AMPS/D-AMPS). Such integrations are being proposed for some communications access types (like CDPD with D- AMPS/AMPS), but it takes a significant amount of time and effort for each such integration to be designed and agreed upon in a standard fashion by the major infrastructure vendors. It is also clear that this solution is unlikely to be extended to every potential combination of known or future communications access types. What is needed then is a mechanism for redirecting multi-mode mobile stations to seamlessly operate been such communications access types having non-integrated air interface standards in connection with a terminating call setup. SUMMARY OF THE INVENTION
A wireless communications network includes plural radio access networks having non-integrated air interface standards. A multi-mode mobile station is serviced and is capable of operation within each of those radio access networks. Responsive to an incoming call request, the wireless communications network locates the mobile station currently being served within a first one of those radio access networks. Recognizing that delivery of the incoming call (or data message) to the mobile station would require use of a second one of those radio access networks, the wireless communications network redirects the mobile station from use of the first radio access to instead make an access the second radio access network. In response to this access, the second radio access network provides the necessary routing information to enable delivery of the incoming call (message) to the mobile station through the second radio access network.
BRIEF DESCRIPTION OF THE DRAWINGS
A more complete understanding of the method and apparatus of the present invention may be acquired by reference to the following Detailed Description when taken in conjunction with the accompanying Drawings wherein:
FIGURE 1 is a block diagram of a wireless communications network having plural radio access networks with non-integrated air interface standards; and
FIGURE 2 is a signal flow and node operation diagram illustrating the flow of signals in connection with the redirection of a terminating call setup between the plural radio access networks and a multi-mode mobile station.
DETAILED DESCRIPTION OF THE DRAWINGS
Reference is now made to FIGURE 1 wherein there is shown a block diagram of a wireless communications network 10 including a first type radio access network 12 and a second type radio access network 14. The first radio access network 12 supports mobile station 16 communications utilizing a corresponding first air interface standard for a first communications access type. Similarly, the second radio access network 12 supports mobile station 16 communications utilizing a corresponding second air interface standard for a second communications access type. The first and second air interface standards are "non-integrated" in the manner defined above. As of the filing of this application for patent, some examples (not all-inclusive) of such first and second communications access types having non-integrated air interface standards requiring the use of different radio access networks 12 and 14 are as follows : First Type Second Type
D-AMPS GPRS
D-AMPS CDPD
D-AMPS GSM
D-AMPS CDMA
D-AMPS EDGE
D-AMPS W-CDMA
D-AMPS PDC
AMPS GPRS
AMPS CDMA
AMPS GSM
GSM W-CDMA
GSM CDMA
GSM PDC
PDC W-CDMA
The first and second radio access networks 12 and 14 preferably (but not necessarily) are connected to the same core network infrastructure. For example, the wireless communications network 10 includes and preferably shares a home location register 18 that stores information concerning the mobile stations 16 comprising, for example, location information and service information. The first and second radio access networks 12 and 14 may further, but not necessarily, share a network access, or "gateway", node 20 that serves as the interface point for signaling and communications between the wireless communications network 10 and other communications networks like the public switched telephone network (PSTN), the
Internet, a wide area network (WAN), another wireless communications network such as a public land mobile network (PLMN), and the like. The gateway node 20 and the radio access networks 12 and 14 are connected to the home location register 18 by means of signaling links 22 providing a known connection, such as (for example) a Mobile Application Part (MAP) or ANSI-41 type connection. The gateway node 20 is connected to the radio access networks 12 and 14 via both trunk connections 24 (illustrated with broken lines) and signaling links 22 (illustrated with solid lines) providing a known connection, such as (for example) an ISUP, TUP, MAP, ANSI-41 or Rl or R2 type connection. Each radio access network 12 and 14 includes one or more (if not many network interconnected) serving nodes 26 that support the provision of communications services to mobile stations 16 currently registered to receive service within that particular network. These serving nodes 26 may generally comprise, for example, switching nodes (such as mobile switching centers - MSCs) and radio nodes (such as base stations - BSs) as well as other specific nodes needed for the provision of communications services within that particular network 12 and 14 such as visitor location registers (VLRs), service control points (SCPs), radio network controllers
(RNCs) and the like (not illustrated).
Although direct communications links (signaling and/or trunk) are illustrated in FIGURE 1, it is understood by those skilled in the art that the links are not necessarily direct between the illustrated nodes, and may instead pass through many other communications nodes (not shown) of the mobile network, and perhaps even utilize other communications networks (such as the public switched telephone network - PSTN). Illustration of the links in the "virtual" manner shown in FIGURE 1 is therefore by way of simplification of the drawing.
Reference is now made in combination to FIGURES 1 and 2, wherein FIGURE 2 is a signal flow and node operation diagram illustrating the flow of signals in connection with a specific example of the redirection of a terminating call setup between the plural radio access networks and a multi-mode mobile station. In connection with this specific example, the first radio access network is assumed to comprise a D-AMPS cellular communications network and the second radio access network is assumed to comprise a CDPD wireless communications network. Still further it is assumed that the D-AMPS and CDPD air interface standards are non- integrated. Still further, it is assumed that the mobile station 16 has registered with and is currently being served by the (first) D-AMPS radio access network.
A data delivery message 100 sent to the address of the mobile station 16(1) originates from a far end user in, for example, the Internet and is received at the gateway node 20. It is recognized by the gateway node 20 that the data delivery message, due to non-integrated air interface standards within the first and second radio access networks 12 and 14, must be delivered through the (second) CDPD radio access network. The gateway node 20 then interrogates the home location register 18 with a location request (send routing) message 102 that includes an indication (parameter
CDPD) that the (second) CDPD radio access network 14 is being requested for delivery of the message 100. The location request (send routing) message 102 is processed by the home location register 20 to determine the current registration mode (D-AMPS) and the current switching node 26(1) within the (first) D-AMPS radio access network 12 currently believed to be serving the addressee mobile station 16.
The home location register 20 then signals the serving mobile switching center 26(1) for the addressee mobile station 16 with a routing request (provide roaming) message 104 that also includes an indication (parameter CDPD) that the (second) CDPD radio access network 14 is requested for delivery of the message 100. The currently serving service node 26(1 ) then determines a location of the addressee mobile station 16. This location may be identified, for example, based on information resulting from a most recent registration (not shown) of the addressee mobile station 16. The service node
26(1) then pages 108 for the addressee mobile station 16 in a location area and/or paging area associated with the serving service node and including the known location. A page acknowledgment 110 is then sent from the mobile station 16 back to the service node 26(1). The currently serving service node 26(1) responds to the page acknowledgment 110 by sending a redirection request message 112 to addressee mobile station 16 that includes an indication (parameter CDPD) that the mobile station should make an access in the (second) CDPD radio access network 14.
Responsive to receipt of the redirection request message 112, the addressee mobile station 16 switches operation over to the (second) CDPD radio access network in action 114 and sends a page acknowledgment 116 to the service node 26(2) currently serving the mobile station in that second network, the page acknowledgment including the mobile station identity. The currently serving service node 26(2) in the (second) CDPD radio access network 14 is ignorant of why the mobile station 16 would be acknowledging a page since it had not previously paged for that mobile station. In this regard, it will be remembered that the page 108 instead had originated from service node 26(1) in the (first) radio access network 12. The currently serving service node 26(2) analyzes the mobile station identity to determine the address of its HLR and then responds to the unsolicited page acknowledgment 116 by sending an unsolicited response message 118 to the home location register 18. This unsolicited response message 118 includes an appropriate routing number for contacting the service node 26(2) that is currently serving the mobile station 16 in the (second) CDPD radio access network 14. The selected routing number is then returned 120 to the gateway node 20. The incoming message 100 is then delivered (through connected) 122 using the routing number to the service node 26(2) in the (second) CDPD radio access network 14. Delivery of the message 100 is completed sending
124 the message over the air interface to the addressee mobile station 16.
Although illustrated in the context of data message delivery to a dual-mode (D- AMPS/CDPD) mobile station 16 initially operating within the D-AMPS network and redirected to access the CDPD network to complete call/message delivery, the general concepts of the present invention are equally applicable to any multi-mode scenario wherein the implicated radio access networks utilize non-integrated air interface standards. The general concepts include: 1) gateway node locating of the mobile station with an indication of the radio access network required to complete delivery (see, messages 102 and 104), wherein the indication may specifically refer to a given radio access network, or the network may be inferred from destination identity type in the delivery message 100 (for example, an IP address instead of a PSTN routable number); 2) serving node redirection of the mobile station following a page response to switch operation and instead access the radio access network required to complete delivery (see, message 112); and 3) radio access network response to a non-requested mobile station network access by sending an unsolicited response message to the home location register providing the necessary routing information to make the delivery through the required radio access network (see, message 118). The specific messages utilized to accomplish the locating, redirection and routing operations maybe uniquely specified for each wireless communications network, but the generic purpose of the messages important to the present invention will remain the same regardless of the specific nomenclature of the messages. It is important that consideration be given during the termination setup process to the specific multi-mode capabilities of the mobile station 16. In this regard, it would be a waste of network resources to proceed with termination setup or with a redirection instruction if the mobile station was not multi-mode capable with the particular radio access network required for delivery. To address this concern, the home location register 18 may, in response to the location request message 102, operate to verify 126 whether the mobile station is multi-mode capable with the radio access network required for delivery. In the foregoing D-AMPS/CDPD example, the home location register would verify from its stored subscription data whether the addressee mobile station 16 was CDPD capable. Only if found capable would the home location register 18 continue with the termination setup process and issue the routing request message 104. As an alternative solution addressing the multi-mode capabilities concern, the first radio access network 12 (through one of its service nodes 26) operates to verify 128 whether the mobile station is multi-mode capable with the radio access network required for delivery. In the foregoing D-AMPS/CDPD example, the mobile station 16 would acknowledge 110 the page 108 with an included indication (parameter) of its supported radio access networks (D-AMPS and CDPD). The service node 26(1) would then verify from those included indications whether the addressee mobile station 16 was CDPD capable. Only if found capable would the service node 26(1) continue with the termination setup process and issue the redirection message 112.
Although preferred embodiments of the method and apparatus of the present invention have been illustrated in the accompanying Drawings and described in the foregoing Detailed Description, it will be understood that the invention is not limited to the embodiments disclosed, but is capable of numerous rearrangements, modifications and substitutions without departing from the spirit of the invention as set forth and defined by the following claims.

Claims

WHAT IS CLAIMED IS:
1. A wireless communications network, comprising: a first radio access network utilizing a first air interface standard; a second radio access network utilizing a second air interface standard; wherein the first and second air interface standards are different and non- integrated; and a first service node within the first radio access network operating, in response to a call termination setup with respect to an incoming call/message that may be delivered through the second radio access network but is not capable of being delivered through the first radio access network, to issue to a delivery destination mobile station currently being served by first radio access network a redirection instruction to switch and instead access the second radio access network for completion of terminating call setup.
2. The wireless communications network, further comprising: a second service node within the second radio access network operating, in response to the delivery destination mobile station's switch and accessing of the second radio access network, to provide routing information to enable delivery of the incoming call/message to the delivery destination mobile station through the second radio access network.
3. The network as in claim 2 wherein the delivery destination mobile station comprises a multi-mode mobile station capable of communications operation within each of the first and second radio access networks.
4. The network as in claim 2 wherein the wireless communications network comprises any one of the following combinations of first and second radio access network types:
First Network: Second Network: D-AMPS GPRS
D-AMPS CDPD
D-AMPS GSM
D-AMPS CDMA
D-AMPS EDGE D-AMPS W-CDMA
D-AMPS PDC
AMPS GPRS AMPS CDMA
AMPS GSM
GSM W-CDMA
GSM CDMA GSM PDC
PDC W-CDMA.
5. The network as in claim 2 further comprising: a gateway node to interface the wireless communications network including the first and second radio access networks to other communications networks.
6. The network as in claim 5 wherein the other communications networks comprise any one or more of the following networks: a wide area network; the Internet; a public land mobile network; an intranet; and a public switched telephone network.
7. The network as in claim 5 wherein the gateway node receives the incoming call/message, recognizes that the incoming call/message needs to be delivered through the second radio access network, and issues a location request for the location of the delivery destination mobile station, that location request including an indication that the second radio access network needs to be used for incoming call/message delivery.
8. The network as in claim 7 further comprising: a home location register that receives the location request message, determines the first service node in the first radio access network currently serving the delivery destination mobile station, and issues a routing request to that first service node for routing information, that routing request including an indication that the second radio access network needs to be used for incoming call/message delivery.
9. The network as in claim 8 wherein the home location register further functions to verify, from stored subscriber data and the location request included indication that the second radio access network needs to be used for incoming call/message delivery, that the delivery destination mobile station is capable of operation within the second radio access network before issuing the routing request.
10. The network as in claim 8 wherein the first service node functions to page for the delivery destination mobile station, and responds to a page acknowledgment received from the delivery destination mobile station by issuing the redirection instruction.
11. The network as in claim 10: wherein the page acknowledgment received from the delivery destination mobile station includes an indication of mobile station capability to operate in different radio access networks; and wherein the first service node further functions to verify, from the page acknowledgment including an indication of mobile station capabilities and the routing request included indication that the second radio access network needs to be used for incoming call/message delivery, that the delivery destination mobile station is capable of operation within the second radio access network before issuing the redirection request.
12. A method for terminating call setup within a wireless communications network comprising a first radio access network utilizing a first air interface standard, and a second radio access network utilizing a second air interface standard, wherein the first and second air interface standards are different and non-integrated, the method comprising the steps of: locating a delivery destination mobile station currently being served within the first radio access network with respect to a wireless communications network received incoming call/message that maybe delivered through the second radio access network but is not capable of being delivered through the first radio access network; and issuing to the delivery destination mobile station currently being served by first radio access network a redirection instruction to switch and instead access the second radio access network for completion of terminating call setup.
13. The method as in claim 12 further comprising the step of: providing, in response to the delivery destination mobile station's switch and accessing of the second radio access network, routing information to enable delivery of the incoming call/message to the delivery destination mobile station through the second radio access network.
14. The method as in claim 13 wherein the delivery destination mobile station comprises a multi-mode mobile station capable of communications operation within each of the first and second radio access networks.
15. The method as in claim 13 wherein the wireless communications network comprises any one of the following combinations of first and second radio access network types:
First Network: Second Network:
D-AMPS GPRS D-AMPS CDPD
D-AMPS GSM D-AMPS CDMA D-AMPS EDGE D-AMPS W-CDMA D-AMPS PDC
AMPS GPRS AMPS CDMA AMPS GSM GSM W-CDMA GSM CDMA
GSM PDC PDC W-CDMA.
16. The method as in claim 13 wherein the step of locating comprises the steps of recognizing that the incoming call/message needs to be delivered through the second radio access network; issuing a location request for the location of the delivery destination mobile station, that location request including an indication that the second radio access network needs to be used for incoming call/message delivery.
17. The method as in claim 16 wherein the step of locating still further comprises the steps of: determining a first service node in the first radio access network currently serving the delivery destination mobile station; and issuing a routing request to that first service node for routing information, that routing request including an indication that the second radio access network needs to be used for incoming call/message delivery.
18. The method as in claim 17 wherein the step of locating still further comprises the step of verifying, from subscriber data and the location request included indication that the second radio access network needs to be used for incoming call/message delivery, that the delivery destination mobile station is capable of operation within the second radio access network before issuing the routing request.
19. The method as in claim 17 wherein the step of locating still further comprises the steps of: paging for the delivery destination mobile station; and responding to a page acknowledgment received from the delivery destination mobile station by issuing the redirection instruction.
20. The method as in claim 19: wherein the page acknowledgment received from the delivery destination mobile station includes a indication of mobile station capability to operate in different radio access networks; and wherein the step of locating still further comprises the step of verifying, from the page acknowledgment including indication of mobile station capabilities and the routing request included indication that the second radio access network needs to be used for incoming call/message delivery, that the delivery destination mobile station is capable of operation within the second radio access network before issuing the redirection request.
21. A multi-mode mobile station operable within a wireless communications network including: a first radio access network utilizing a first air interface standard; a second radio access network utilizing a second air interface standard; wherein the first and second air interface standards are different and non- integrated; the multi-mode mobile station operating to access either the first or second radio access network with an access message including a parameter indicating that it supports communications in both the first and second radio access networks.
22. The multi-mode mobile station as in claim 21 wherein the multi-mode mobile station responds to a page sent from the first radio access network with an acknowledgment sent within the first radio access network and including the parameter indicating support of communications in the second radio access network.
23. The multi-mode mobile station as in claim 21 wherein the wireless communications network comprises any one of the following combinations of first and second radio access network types:
First Network: Second Network: D-AMPS GPRS
D-AMPS CDPD
D-AMPS GSM
D-AMPS CDMA
D-AMPS EDGE D-AMPS W-CDMA
D-AMPS PDC
AMPS GPRS
AMPS CDMA
AMPS GSM GSM W-CDMA
GSM CDMA
GSM PDC
PDC W-CDMA.
PCT/SE2000/002583 2000-01-04 2000-12-19 Redirection at terminating call setup for dual-mode mobile stations operating through radio access networks having non-integrated air interface standards WO2001050804A1 (en)

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