WO2008033951A2 - Delivery of mobile terminated call during inter-vlr location update - Google Patents

Delivery of mobile terminated call during inter-vlr location update Download PDF

Info

Publication number
WO2008033951A2
WO2008033951A2 PCT/US2007/078309 US2007078309W WO2008033951A2 WO 2008033951 A2 WO2008033951 A2 WO 2008033951A2 US 2007078309 W US2007078309 W US 2007078309W WO 2008033951 A2 WO2008033951 A2 WO 2008033951A2
Authority
WO
WIPO (PCT)
Prior art keywords
vlr
mobile
msc
terminated call
message
Prior art date
Application number
PCT/US2007/078309
Other languages
French (fr)
Other versions
WO2008033951A3 (en
Inventor
Yibo Zhang
Lu Tian
Yong Zhao
Bruno Landais
Original Assignee
Alcatel-Lucent
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel-Lucent filed Critical Alcatel-Lucent
Priority to EP07842364A priority Critical patent/EP2069949B1/en
Publication of WO2008033951A2 publication Critical patent/WO2008033951A2/en
Publication of WO2008033951A3 publication Critical patent/WO2008033951A3/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/02Processing 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
    • H04W8/08Mobility data transfer
    • H04W8/12Mobility data transfer between location registers or mobility servers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W60/00Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/02Processing 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
    • H04W8/06Registration at serving network Location Register, VLR or user mobility server

Definitions

  • the present invention relates in general to wireless communication systems, and in particular, to handling of mobile terminated calls during location updates.
  • Today's wireless telecommunications networks provide telephone subscribers with the ability to access telecommunications services from almost anywhere in the world.
  • the key to facilitating such world-wide access is mobility management.
  • mobility management wireless networks are able to track the location of mobile subscribers so that mobile services can be delivered to them.
  • a wireless network is typically formed of a number of cells, each covering a small geographic area within which a mobile device, such as a mobile station, may receive mobile services.
  • Each cell is equipped with a base station that provides radio coverage to the cell, thereby enabling communication with mobile devices located within the cell.
  • a wireless network is able to provide radio coverage to mobile subscribers over a large geographic area.
  • the coverage area of a collection of neighboring base stations is commonly referred to as a location area.
  • Each location area is served by a mobile switching center/visitor location register (MSC/VLR), and each MSC/VLR may serve multiple location areas.
  • the MSC/VLR is the network node that provides circuit-switched calling, mobility management and other telecommunications/mobile services to mobile subscribers.
  • the MSC/VLR maintains subscriber data for all mobile subscribers that are currently located within one of the location areas served by the MSC/VLR.
  • the subscriber data for each mobile subscriber typically includes the location area and serving base station of the mobile subscriber, which allows the MSC/VLR to page, communicate with and connect incoming calls to that mobile subscriber.
  • Each mobile device is responsible for maintaining the location area code (LAC) of the current location area and comparing the stored LAC with subsequent LACs that are broadcast and received by the mobile device. If the mobile device finds that the received LAC is different from the stored LAC, the mobile device sends a location update request to the wireless network. If the new location area is served by a different MSC/VLR than the previous location area, an inter- VLR location update is performed.
  • LAC location area code
  • the new MSC/VLR that receives the location update request from the mobile subscriber transmits an update location message to the Home Location Register (HLR) of the mobile subscriber.
  • the HLR is a database that maintains permanent subscriber records for mobile subscribers.
  • the HLR forwards the subscriber data associated with the mobile subscriber to the new MSC/VLR for temporary storage in the new MSC/VLR while the mobile subscriber is within the MSC/VLR coverage area and updates its records to indicate that the mobile subscriber is now present in a location area served by the new MSC/VLR.
  • the HLR asks the old MSC/VLR to delete its subscriber record for this mobile subscriber since the mobile subscriber is no longer located in a location area served by the old MSC/VLR.
  • the mobile subscriber can continue to receive mobile services through the new MSC/VLR.
  • an incoming call to the mobile subscriber is first routed to a gateway mobile switching center (GMSC) serving the wireless network of the mobile subscriber.
  • GMSC gateway mobile switching center
  • the GMSC queries the HLR to determine the current location of the mobile subscriber.
  • the HLR typically returns routing information to the GMSC that includes the identity of the MSC/VLR serving the mobile subscriber.
  • the GMSC uses the routing information to route the mobile terminated call to the MSC/VLR.
  • the MSC/VLR accesses its subscriber data for the mobile subscriber to determine the location area of the mobile subscriber, and pages the mobile device of the mobile subscriber within that location area to set-up a call connection to the mobile device for the mobile terminated call.
  • the mobile terminated call may not be completed to the mobile subscriber. For example, if the HLR has not yet been informed of the change in location when the GMSC queries the HLR for routing information, the HLR will return the routing information for the old MSC/VLR to the GMSC.
  • the GMSC will route the call to the old MSC/VLR, and the old MSC/VLR will attempt to page the mobile station.
  • the mobile device since the mobile subscriber is no longer in the MSC/VLR area, the mobile device will not be able to answer the page.
  • the call is rejected, and therefore is not delivered to the mobile subscriber. Instead, other call handling, such as voice mail, is applied to the mobile terminated call. This is dissatisfactory for many mobile subscribers and network providers.
  • Embodiments of the present invention provide a method and apparatus for delivering a mobile terminated call to a mobile device communicating with a wireless communication network.
  • the method includes receiving the mobile terminated, in which the mobile terminated call has old routing information associated therewith that identifies an old mobile switching center/visitor location register (MSC/VLR) previously serving the mobile device, determining that the mobile device is performing a location update to a new MSC/VLR prior to connection of the mobile terminated call and enabling the mobile terminated call to be routed to the new MSC/VLR for connection of the mobile terminated call to the mobile device.
  • MSC/VLR mobile switching center/visitor location register
  • the old MSC/VLR determines that the mobile device is performing a location update to the new MSC/VLR by receiving a cancel location message from a Home Location Register (HLR) associated with the mobile device.
  • HLR Home Location Register
  • the old MSC/VLR determines new routing information for the mobile terminated call that identifies the new MSC/VLR and routes the mobile terminated call to the new MSC/VLR for connection of the mobile terminated call to the mobile device.
  • the old MSC/VLR upon receiving the cancel location message, sends a resume call handling (RCH) message to a gateway mobile switching center (GMSC) that originally routed the mobile terminated call to the old MSC/VLR.
  • the RCH message including a roaming retry indicator instructing the GMSC to re-route the mobile terminated call to the new MSC/VLR.
  • the GMSC determines new routing information for the mobile terminated call that identifies the new MSC/VLR and routes the mobile terminated call to the new MSC/VLR for connection of the mobile terminated call to the mobile device.
  • FIGURE 1 is a block diagram illustrating an exemplary wireless network for delivering a mobile terminated call to a mobile station during an inter- VLR location update, in accordance with embodiments of the present invention
  • FIGURE 2 is a flowchart illustrating an exemplary process for delivering a mobile terminated call to a mobile station during an inter-VLR location update, in accordance with embodiments of the present invention
  • FIGURE 3 is a block diagram illustrating one embodiment for delivering a mobile terminated call to a mobile station during an inter-VLR location update
  • FIGURE 4 is a flowchart illustrating an exemplary process for delivering a mobile terminated call to a mobile station during an inter-VLR location update according to the embodiment shown in FIGURE 3;
  • FIGURE 5 is a signaling diagram illustrating exemplary signaling for delivering a mobile terminated call to a mobile station according to the embodiment shown in FIGURE 3;
  • FIGURE 6 is a block diagram illustrating another embodiment for delivering a mobile terminated call to a mobile station during an inter-VLR location update
  • FIGURE 7 is a flowchart illustrating an exemplary process for delivering a mobile terminated call to a mobile station during an inter-VLR location update according to the embodiment shown in FIGURE 6; and FIGURES 8A and 8B are signaling diagrams illustrating exemplary signaling for delivering a mobile terminated call to a mobile station according to the embodiment shown in FIGURE 6.
  • FIGURE 1 is a block diagram illustrating an exemplary wireless network 10 for delivering a mobile terminated call 20 to a mobile station 80 during an inter- VLR location update, in accordance with embodiments of the present invention.
  • the wireless network 10 includes a Gateway Mobile Switching Center (GMSC) 30, Mobile Switching Center/Visitor Location Registers (MSC/VLR) 50 and 60, Base Station System (BSS) 70 and Home Location Register (HLR) 40.
  • GMSC Gateway Mobile Switching Center
  • MSC/VLR Mobile Switching Center/Visitor Location Registers
  • BSS Base Station System
  • HLR Home Location Register
  • MSC/VLR 50 serves location area 55
  • MSC/VLR 60 serves location area 65.
  • each MSC/VLR 50 and 60 may serve multiple location areas. However, for simplicity, only one location area for each MSC/VLR is shown.
  • mobile station 80 has recently moved from location area 65 served by MSC/VLR 60 into location area 55 served by MSC/VLR 50.
  • MSC/VLR 60 is labeled "old MSC/VLR”
  • MSC/VLR 50 is labeled "new MSC/VLR.”
  • LAC location area code
  • the new MSC/VLR 50 Upon receiving the location update request, the new MSC/VLR 50 transmits an update location message to the HLR 40 to retrieve the subscriber data associated with the mobile station 80 and to update the HLR 40 with the new location area 55 served by the new MSC/VLR 50.
  • the HLR 40 transmits a cancel location message to the old MSC/VLR 60 instructing the old MSC/VLR 60 to delete the mobile station's 80 subscriber data from its records since the mobile station 80 is no longer located in the location area 65 served by the old MSC/VLR 60.
  • the GMSC 30 queries the HLR 40 for routing information to deliver the incoming call to the mobile station 80. If the HLR 40 has not yet received the update location message from the new MSC/VLR 50 when the GMSC query is received, the HLR 40 returns the routing information for the old MSC/VLR 60 to the GMSC 30. Thus, the GMSC routes the mobile terminated call 20 to the old MSC/VLR 60 for call handling.
  • the old MSC/VLR 60 When the old MSC/VLR 60 receives the call 20, the old MSC/VLR 60 accesses its subscriber data for the mobile subscriber to determine the location area 65 of the mobile station 80, and pages the mobile station 80 within that location area 65 to attempt to set-up a call connection to the mobile station 80 for the mobile terminated call. However, since the mobile station 80 has moved out of location area 65 and into location area 55, and is currently performing a location update to the new MSC/VLR 50, the mobile station 80 will not be able to answer the page from the old MSC/VLR.
  • the MSC/VLR 60 stops paging the mobile station 80 and redirects the call 20 to enable the call 20 to be routed to the new MSC/VLR 50 and ultimately delivered to the mobile station 80 upon completion of the location update.
  • the old MSC/VLR 60 queries the HLR 40 for new routing information for the mobile station 80, and uses the new routing information to forward the call to the new MSC/VLR 50.
  • the old MSC/VLR 60 releases the call back to the GMSC 30.
  • the GMSC 30, in turn, re-queries the HLR 40 for new routing information for the mobile station 80 and uses the new routing information to re-route the call to the new MSC/VLR 50.
  • FIGURE 2 an exemplary process 200 for delivering a mobile terminated call to a mobile station during an inter- VLR location update is shown.
  • a mobile terminated call to a mobile station is received with routing information identifying the old MSC/VLR as the serving MSC/VLR.
  • the mobile terminated call is received at the old MSC/VLR from the GMSC.
  • the mobile terminated call is received at the GMSC after being re-routed back to the GMSC from the old MSC/VLR.
  • a determination is made that the mobile station is currently performing a location update to a new MSC/VLR (e.g., by receiving a cancel location message at the old MSC/VLR or by releasing the call back to the GMSC).
  • the mobile terminated call is routed to the new MSC/VLR either directly from the old MSC/VLR or from the GMSC, as will be described in further detail below.
  • FIGURE 3 is a block diagram illustrating one embodiment for delivering a mobile terminated call to a mobile station during an inter- VLR location update.
  • the mobile terminated call is routed from the old MSC/VLR 60 to the new MSC/VLR 50 for delivery of the call to the mobile station.
  • the GMSC 30 first receives the incoming mobile terminated call from the network, the GMSC 30 sends a Send Routing Information (SRI) message 305 to the HLR 40.
  • SRI Send Routing Information
  • the HLR 40 accesses the subscriber record for the mobile station to determine the serving MSC/VLR, here the old MSC/VLR 60, and transmits a Provide Roaming Number (PRN) message 310 to the old MSC/VLR 60.
  • PRN Provide Roaming Number
  • the old MSC/VLR 60 sends a message 315 including a Mobile Station Roaming Number (MSRN) back to the HLR 40.
  • MSRN Mobile Station Roaming Number
  • the MSRN is an E.164 number that is temporarily assigned to the mobile station for the mobile terminated call and can be used to route the mobile terminated call to the old MSC/VLR 60.
  • the HLR 40 Upon receipt of the MSRN, the HLR 40 forwards the MSRN in another message 320 back to the GMSC 30.
  • the GMSC 30 uses the MSRN to route an Initial Address Message (IAM) 325 for the mobile terminated call to the old MSC/VLR 60.
  • IAM Initial Address Message
  • the new MSC/VLR 50 is transmitting an update location message 328 for the mobile station to the HLR 40.
  • the HLR 40 transmits a cancel location message 330 to the old MSC/VLR 60.
  • the old MSC/VLR 60 upon receiving the cancel location message 330 from the HLR 40, transmits a second Send Routing Information (SRI) message 335 to the HLR 40 for the mobile terminated call.
  • SRI Send Routing Information
  • the HLR 40 sends a Provide Roaming Number (PRN) message 340 to the new MSC/VLR 50 to retrieve a new MSRN in message 345 for the mobile terminated call from the new MSC/VLR 50.
  • PRN Provide Roaming Number
  • the HLR 40 forwards the MSRN for the new MSC/VLR 50 in message 350 to the old MSC/VLR 60, and the old MSC/VLR 60 uses the received MSRN to route an IAM 355 for the mobile terminated call to the new MSC/VLR 50.
  • FIGURE 4 is a flowchart illustrating an exemplary process 400 for delivering a mobile terminated call to a mobile station during an inter- VLR location update according to the embodiment shown in FIGURE 3.
  • an IAM for a mobile terminated call to a mobile station is received at an old MSC/VLR, and at block 420, a cancel location message for the mobile station is also received at the old MSC/VLR, at block 430, the old MSC/VLR sends an SRI message to the HLR to retrieve the MSRN of the mobile station for the new MSC/VLR.
  • FIGURE 5 is a signaling diagram illustrating exemplary signaling for delivering a mobile terminated call to a mobile station according to the embodiment shown in FIGURE 3.
  • the GMSC 30 transmits a Send Routing Information (SRI) message to the HLR 40 to retrieve routing information for routing of the call to the serving MSC/VLR.
  • SRI Send Routing Information
  • the HLR 40 accesses the subscriber record for the mobile station to identify the serving MSC/VLR (i.e., old MSC/VLR 60) and transmits a Provide Roaming Number (PRN) message at 502 to the old MSC/VLR 60.
  • the serving MSC/VLR i.e., old MSC/VLR 60
  • PRN Provide Roaming Number
  • the old MSC/VLR 60 transmits a PRN acknowledgment message at 504 back to the HLR that includes a Mobile Station Roaming Number (MSRN) for the mobile terminated call.
  • the HLR 40 forwards the MSRN to the GMSC 30 in an SRI acknowledgment message at 506.
  • the GMSC 30 uses the received MSRN, the GMSC 30 generates and transmits an Initial Address Message (IAM) at 508 for the call to the old MSC/VLR 60.
  • IAM Initial Address Message
  • the old MSC/VLR accesses the temporary subscriber record for the mobile station to determine the location area within which the mobile station last reported it was located, and at 510, pages the mobile station within that location area.
  • the mobile station 80 Prior to paging by the old MSC/VLR 60, the mobile station 80 transmits a location update request at 512 to the new MSC/VLR 50. After authentication of the mobile station 80 at 514, the new MSC/VLR 50 transmits an update location message at 516 to the HLR 40 to update the HLR 40 with the new location (i.e., new MSC/VLR identity and/or new location area) of the mobile station 80. Upon receiving the update location message, the HLR 40 transmits a cancel location message at 518 to the old MSC/VLR 60, requesting the old MSC/VLR to delete the temporary subscriber record for the mobile station.
  • the new location message i.e., new MSC/VLR identity and/or new location area
  • the old MSC/VLR deletes the subscriber record for the mobile station
  • the old MSC/VLR transmits a cancel location acknowledgement message at 520 back to the HLR 40.
  • the old MSC/VLR stops paging the mobile station (e.g., by stopping the paging timer for the mobile station) and initiates a second SRI message at 524 for the mobile terminated call to the HLR 40.
  • the old MSC/VLR 60 stops paging and returns the PRN acknowledgement message (at 504) to the HLR 40 with an indication that the mobile subscriber is absent (i.e., "Absent Subscriber").
  • the HLR 40 re-transmits the PRN message to the new MSC/VLR 50, and sends the MSRN associated with the new MSC/VLR 50 back to the GMSC 30.
  • the old MSC/VLR 60 if the cancel location message is received before the IAM arrives but after the PRN ACK is sent, the old MSC/VLR 60 triggers the second SRI message to the HLR 40 at Send Info for Incoming Call. In still another embodiment, if the cancel location message is received before paging, but after the Send Info for Incoming Call message, the old MSC/VLR 60 triggers the second SRI message to the HLR 40 without paging.
  • the HLR 40 When the HLR 40 receives the second SRI message for the mobile terminated call from the old MSC/VLR 60 at 524, if the HLR is still processing the location update for the mobile station, at 526, the HLR 40 delays sending out the Provide Roaming Number (PRN) message to the new MSC/VLR 50 until the location update is complete. For example, as shown at 528, multiple insert subscriber data messages are sent from the HLR 40 to the new MSC/VLR 50 during the location update process to provide the new MSC/VLR with the subscriber data associated with the mobile station 80. In addition, each time the new MSC/VLR 50 receives subscriber data for the mobile station from the HLR 40, the new MSC/VLR 50 provides an insert subscriber data acknowledgement message at 530 back to the HLR 40.
  • PRN Provide Roaming Number
  • the HLR 40 transmits an update location acknowledgement message at 532 to the new MSC/VLR 50. Afterwards, the HLR 40 is able to transmit a Provide Roaming Number (PRN) message at 534 to the new MSC/VLR 50. In response, the new MSC/VLR 50 transmits a PRN acknowledgment message at 536 back to the HLR 40 that includes a new Mobile Station Roaming Number (MSRN) for the mobile terminated call. The HLR 40 forwards the new MSRN to the old MSC/VLR 60 in a second SRI acknowledgment message at 538. Using the received new MSRN, the old MSC/VLR 60 generates and transmits an Initial Address Message (IAM) at 540 for the call to the new MSC/VLR 50.
  • IAM Initial Address Message
  • the new MSC/VLR 50 delays setup of the call to the mobile station until the location update procedure finishes.
  • the new MSC/VLR 50 may need to transmit a location update accept message at 544 that assigns a new Temporary Mobile Subscriber Identity (TMSI) to the mobile station for the new MSC/VLR 50.
  • TMSI Temporary Mobile Subscriber Identity
  • the mobile station 80 may need to reply back that the TMSI allocation has been completed.
  • the new MSC/VLR can use the existing connection (used for location update) to the mobile station 80 or page the mobile station 80 and at 548 transmit a call setup message to the mobile station.
  • a call confirmation message is transmitted back to the new MSC/VLR 50 from the mobile station 80. Normal mobile terminated call procedure follows at 552 to connect the mobile terminated call to the mobile station 80.
  • FIGURE 6 is a block diagram illustrating another embodiment for delivering a mobile terminated call to a mobile station during an inter- VLR location update.
  • the mobile terminated call is routed back to the GMSC 30 from the old MSC/VLR 60, and re-routed from the GMSC 30 to the new MSC/VLR 50 for delivery of the call to the mobile station.
  • SRI Send Routing Information
  • the HLR 40 accesses the subscriber record for the mobile station to determine the serving MSC/VLR, here the old MSC/VLR 60, and transmits a Provide Roaming Number (PRN) message 610 to the old MSC/VLR 60.
  • PRN Provide Roaming Number
  • the old MSC/VLR 60 sends a message 615 including a Mobile Station Roaming Number (MSRN) for the mobile terminated call to be used in routing to the old MSC/VLR 60 back to the HLR 40.
  • MSRN Mobile Station Roaming Number
  • the HLR 40 forwards the MSRN in another message 620 back to the GMSC 30.
  • the GMSC 30 uses the MSRN to route an Initial Address Message (IAM) 625 for the mobile terminated call to the old MSC/VLR 60.
  • IAM Initial Address Message
  • the new MSC/VLR 50 is transmitting an update location message 628 for the mobile station to the HLR 40.
  • the HLR 40 transmits a cancel location message 630 to the old MSC/VLR 60.
  • the old MSC/VLR 60 upon receiving the cancel location message 630 from the HLR 40, transmits a resume call handling (RCH) message 635 back to the HLR 40.
  • the RCH message 635 includes a call reference number that identifies the mobile terminated call and a roaming retry indicator that instructs the GMSC 30 to obtain a new MSRN and re-route the mobile terminated call.
  • the GMSC 30 sends a second Send Routing Information (SRI) message 640 to the HLR 40 for the mobile terminated call.
  • SRI Send Routing Information
  • the HLR 40 sends a Provide Roaming Number (PRN) message 645 to the new MSC/VLR 50 to retrieve a new MSRN in message 650 for the mobile terminated call from the new MSC/VLR 50.
  • PRN Provide Roaming Number
  • the HLR 40 forwards the MSRN for the new MSC/VLR 50 in message 655 to the GMSC 30, and the GMSC 30 uses the received MSRN to route an IAM 660 for the mobile terminated call to the new MSC/VLR 50.
  • FIGURE 7 is a flowchart illustrating an exemplary process 700 for delivering a mobile terminated call to a mobile station during an inter- VLR location update according to the embodiment shown in FIGURE 6.
  • an IAM for a mobile terminated call to a mobile station is received at an old MSC/VLR from the GMSC, and at block 720, a cancel location message for the mobile station is also received at the old MSC/VLR, at block 730, the old MSC/VLR sends an Resume Call Handling (RCH) message with the roaming retry indicator back to the GMSC, which instructs the GMSC to obtain a new MSRN associated with the new MSC/VLR and to reroute the mobile terminated call to the new MSC/VLR using the new MSRN.
  • RCH Resume Call Handling
  • FIGURES 8A and 8B are signaling diagrams illustrating exemplary signaling for delivering a mobile terminated call to a mobile station according to the embodiment shown in FIGURE 6.
  • the GMSC 30 when the GMSC 30 receives a mobile terminated call for a mobile station, at 800, the GMSC 30 transmits a Send Routing Information (SRI) message with the address of the GMSC 30 and a call reference for the mobile terminated call to the HLR 40 to retrieve routing information for routing of the call to the serving MSC/VLR.
  • SRI Send Routing Information
  • the HLR 40 accesses the subscriber record for the mobile station to identify the serving MSC/VLR (i.e., old MSC/VLR 60) and transmits a Provide Roaming Number (PRN) message at 802 to the old MSC/VLR 60.
  • PRN Provide Roaming Number
  • the old MSC/VLR 60 transmits a PRN acknowledgment message at 802
  • the HLR 40 forwards the MSRN to the GMSC 30 in an SRI acknowledgment message at 806.
  • the GMSC 30 uses the received MSRN, the GMSC 30 generates and transmits an Initial Address Message (IAM) at 808 for the call to the old MSC/VLR 60.
  • IAM Initial Address Message
  • the old MSC/VLR 60 accesses the temporary subscriber record for the mobile station to determine the location area within which the mobile station last reported it was located, and at 810, pages the mobile station within that location area.
  • the mobile station 80 Prior to paging by the old MSC/VLR 60, the mobile station 80 transmits a location update request at 812 to the new MSC/VLR 50. After authentication of the mobile station 80 at 814, the new MSC/VLR 50 transmits an update location message at 816 to the HLR 40 to update the HLR 40 with the new location (i.e., new MSC/VLR identity and/or new location area) of the mobile station 80. Upon receiving the update location message, the HLR 40 transmits a cancel location message at 818 to the old MSC/VLR 60, requesting the old MSC/VLR to delete the temporary subscriber record for the mobile station. Once the old MSC/VLR 60 deletes the subscriber record for the mobile station, the old MSC/VLR 60 transmits a cancel location acknowledgement message at 820 back to the HLR 40.
  • the new MSC/VLR 50 transmits a cancel location acknowledgement message at 820 back to the HLR 40.
  • the old MSC/VLR stops paging the mobile station (e.g., by stopping the paging timer for the mobile station) and informs the GMSC 30 that the mobile station has roamed into a new location area served by a new MSC/VLR 50.
  • the old MSC/VLR 60 transmits a resume call handling (RCH) message at 826 to the GMSC 30.
  • the RCH message includes the call reference identifying the mobile terminated call and a roaming retry indicator that informs the GMSC 30 that a new MSRN is needed for the mobile terminated call.
  • An example of the parameters within the RCH message is shown below in Table 1.
  • the call redirection is handled by the old MSC/VLR after receipt of the IAM at 808, in other embodiments, if the cancel location message is received during the pre-paging (i.e., before PRN ACK at 804), the old MSC/VLR 60 stops paging and returns the PRN acknowledgement message (at 804) to the HLR 40 with an indication that the mobile subscriber is absent (i.e., "Absent Subscriber"). In this case, the HLR 40 re-transmits the PRN message to the new MSC/VLR 50, and sends the MSRN associated with the new MSC/VLR 50 back to the GMSC 30.
  • the old MSC/VLR 60 if the cancel location message is received before the IAM arrives but after the PRN ACK is sent, the old MSC/VLR 60 triggers the RCH with roaming retry to the GMSC during the Send Info for Incoming Call after the IAM is received. In still another embodiment, if the cancel location message is received before paging, but after the Send Info for Incoming Call message, the old MSC/VLR 60 triggers the RCH instead of paging.
  • the GMSC 30 when the GMSC 30 receives the RCH message from the old MSC/VLR 60, the GMSC 30 transmits an RCH acknowledgement message at 828 back to the old MSC/VLR 60. In addition, at 830, the GMSC 30 instructs the old MSC/VLR 60 to release the call, and in response, the old MSC/VLR 60 releases the call and at 832 transmits a release complete message back to the GMSC. Thereafter, the GMSC 30 transmits a second SRI message for the mobile terminated call at 834 to the HLR 40.
  • the HLR 40 When the HLR 40 receives the second SRI message from the GMSC at 834, if as shown in FIGURE 8B, the HLR 40 is still processing the location update for the mobile station, at 836, the HLR 40 delays sending out the Provide Roaming Number (PRN) message to the new MSC/VLR 50 until the location update is complete. For example, as shown at 824 and 838, multiple insert subscriber data messages are sent from the HLR 40 to the new MSC/VLR 50 during the location update process to provide the new MSC/VLR with the subscriber data associated with the mobile station 80.
  • PRN Provide Roaming Number
  • the new MSC/VLR 50 each time the new MSC/VLR 50 receives subscriber data for the mobile station from the HLR 40, the new MSC/VLR 50 provides an insert subscriber data acknowledgement message back to the HLR 40. Once all of the subscriber data for the mobile station has been sent to the new MSC/VLR 50
  • the HLR 40 transmits an update location acknowledgement message at 840 to the new MSC/VLR 50. Afterwards, the HLR 40 is able to transmit a Provide Roaming Number (PRN) message at 842 to the new MSC/VLR 50. In response, the new MSC/VLR 50 transmits a PRN acknowledgment message at 844 back to the HLR 40 that includes a new Mobile Station Roaming Number (MSRN) for the mobile terminated call. The HLR 40 forwards the new MSRN to the GMSC 30 in a second SRI acknowledgment message at 846. Using the received new MSRN, the GMSC 30 generates and transmits an Initial Address Message (IAM) at 848 for the call to the new MSC/VLR 50.
  • IAM Initial Address Message
  • the new MSC/VLR 50 delays setup of the call to the mobile station until the location update procedure finishes.
  • the new MSC/VLR 50 may need to transmit a location update accept message at 852 that assigns a new Temporary Mobile Subscriber Identity (TMSI) to the mobile station for the new MSC/VLR 50.
  • TMSI Temporary Mobile Subscriber Identity
  • the mobile station 80 may need to reply back that the TMSI allocation has been completed.
  • the new MSC/VLR can use the existing connection (used for location update) to the mobile station 80 or page the mobile station 80 and at 856 transmit a call setup message to the mobile station.
  • a call confirmation message is transmitted back to the new MSC/VLR 50 from the mobile station 80. Normal mobile terminated call procedure follows at 860 to connect the mobile terminated call to the mobile station 80.

Abstract

A mobile terminated call is delivered to a mobile device during an inter- VLR location update by first routing the mobile terminated call to the old mobile switching center/visitor location register (MSC/VLR), determining that the mobile device is performing a location update to a new MSC/VLR at the old MSC/VLR, and then routing the mobile terminated call to the new MSC/VLR directly from the old MSC/VLR or via the gateway mobile switching center (GMSC) for connection of the mobile terminated call to the mobile device.

Description

DELIVERY OF MOBILE TERMINATED CALL DURING INTER-VLR
LOCATION UPDATE
CROSS-REFERENCE TO RELATED APPLICATIONS This U.S. Nonpro visional Application for Patent claims the benefit of the filing date of U.S. Provisional Patent Application entitled, 2nd SRI Solutions (with/without OR) to the Mobile Termination Call During the Inter- VLR Location Update, Attorney Docket No. 800295, having Serial No. 60/825,291, filed on September 12, 2006, which is incorporated herein by reference for all purposes.
BACKGROUND OF THE INVENTION
Technical Field of the Invention
The present invention relates in general to wireless communication systems, and in particular, to handling of mobile terminated calls during location updates.
Description of Related Art
Today's wireless telecommunications networks provide telephone subscribers with the ability to access telecommunications services from almost anywhere in the world. The key to facilitating such world-wide access is mobility management. With mobility management, wireless networks are able to track the location of mobile subscribers so that mobile services can be delivered to them.
A wireless network is typically formed of a number of cells, each covering a small geographic area within which a mobile device, such as a mobile station, may receive mobile services. Each cell is equipped with a base station that provides radio coverage to the cell, thereby enabling communication with mobile devices located within the cell. By integrating the coverage of multiple base stations, a wireless network is able to provide radio coverage to mobile subscribers over a large geographic area.
The coverage area of a collection of neighboring base stations is commonly referred to as a location area. Each location area is served by a mobile switching center/visitor location register (MSC/VLR), and each MSC/VLR may serve multiple location areas. The MSC/VLR is the network node that provides circuit-switched calling, mobility management and other telecommunications/mobile services to mobile subscribers. In particular, the MSC/VLR maintains subscriber data for all mobile subscribers that are currently located within one of the location areas served by the MSC/VLR. For example, the subscriber data for each mobile subscriber typically includes the location area and serving base station of the mobile subscriber, which allows the MSC/VLR to page, communicate with and connect incoming calls to that mobile subscriber. When a mobile subscriber moves or "roams" into a new location area, the mobile subscriber must inform the wireless network of the change in location area by performing what is commonly referred to as a location update procedure. Each mobile device is responsible for maintaining the location area code (LAC) of the current location area and comparing the stored LAC with subsequent LACs that are broadcast and received by the mobile device. If the mobile device finds that the received LAC is different from the stored LAC, the mobile device sends a location update request to the wireless network. If the new location area is served by a different MSC/VLR than the previous location area, an inter- VLR location update is performed. During the inter- VLR location update, the new MSC/VLR that receives the location update request from the mobile subscriber transmits an update location message to the Home Location Register (HLR) of the mobile subscriber. The HLR is a database that maintains permanent subscriber records for mobile subscribers. Upon receiving the update location message, the HLR forwards the subscriber data associated with the mobile subscriber to the new MSC/VLR for temporary storage in the new MSC/VLR while the mobile subscriber is within the MSC/VLR coverage area and updates its records to indicate that the mobile subscriber is now present in a location area served by the new MSC/VLR. In addition, the HLR asks the old MSC/VLR to delete its subscriber record for this mobile subscriber since the mobile subscriber is no longer located in a location area served by the old MSC/VLR.
Once the location update procedure is complete, the mobile subscriber can continue to receive mobile services through the new MSC/VLR. For example, in a typical mobile terminated call scenario, an incoming call to the mobile subscriber is first routed to a gateway mobile switching center (GMSC) serving the wireless network of the mobile subscriber. Upon receiving the mobile terminated call, the GMSC queries the HLR to determine the current location of the mobile subscriber. For example, the HLR typically returns routing information to the GMSC that includes the identity of the MSC/VLR serving the mobile subscriber. The GMSC uses the routing information to route the mobile terminated call to the MSC/VLR. The MSC/VLR accesses its subscriber data for the mobile subscriber to determine the location area of the mobile subscriber, and pages the mobile device of the mobile subscriber within that location area to set-up a call connection to the mobile device for the mobile terminated call. However, if the mobile terminated call is received during the time that the mobile subscriber is performing an inter-VLR location update, the mobile terminated call may not be completed to the mobile subscriber. For example, if the HLR has not yet been informed of the change in location when the GMSC queries the HLR for routing information, the HLR will return the routing information for the old MSC/VLR to the GMSC. Thus, the GMSC will route the call to the old MSC/VLR, and the old MSC/VLR will attempt to page the mobile station. However, since the mobile subscriber is no longer in the MSC/VLR area, the mobile device will not be able to answer the page. Currently, when a mobile device does not answer a page for a mobile terminated call, the call is rejected, and therefore is not delivered to the mobile subscriber. Instead, other call handling, such as voice mail, is applied to the mobile terminated call. This is dissatisfactory for many mobile subscribers and network providers.
Therefore, what is needed is mechanism for delivering mobile terminated calls to mobile subscribers during inter-VLR location updates.
SUMMARY OF THE INVENTION
Embodiments of the present invention provide a method and apparatus for delivering a mobile terminated call to a mobile device communicating with a wireless communication network. The method includes receiving the mobile terminated, in which the mobile terminated call has old routing information associated therewith that identifies an old mobile switching center/visitor location register (MSC/VLR) previously serving the mobile device, determining that the mobile device is performing a location update to a new MSC/VLR prior to connection of the mobile terminated call and enabling the mobile terminated call to be routed to the new MSC/VLR for connection of the mobile terminated call to the mobile device.
In one embodiment, the old MSC/VLR determines that the mobile device is performing a location update to the new MSC/VLR by receiving a cancel location message from a Home Location Register (HLR) associated with the mobile device. In an exemplary embodiment, upon receiving the cancel location message, the old MSC/VLR determines new routing information for the mobile terminated call that identifies the new MSC/VLR and routes the mobile terminated call to the new MSC/VLR for connection of the mobile terminated call to the mobile device.
In another exemplary embodiment, upon receiving the cancel location message, the old MSC/VLR sends a resume call handling (RCH) message to a gateway mobile switching center (GMSC) that originally routed the mobile terminated call to the old MSC/VLR. The RCH message including a roaming retry indicator instructing the GMSC to re-route the mobile terminated call to the new MSC/VLR. In a further exemplary embodiment, the GMSC determines new routing information for the mobile terminated call that identifies the new MSC/VLR and routes the mobile terminated call to the new MSC/VLR for connection of the mobile terminated call to the mobile device.
BRIEF DESCRIPTION OF THE DRAWINGS
A more complete understanding of the present invention may be obtained by reference to the following detailed description when taken in conjunction with the accompanying drawings wherein: FIGURE 1 is a block diagram illustrating an exemplary wireless network for delivering a mobile terminated call to a mobile station during an inter- VLR location update, in accordance with embodiments of the present invention;
FIGURE 2 is a flowchart illustrating an exemplary process for delivering a mobile terminated call to a mobile station during an inter-VLR location update, in accordance with embodiments of the present invention;
FIGURE 3 is a block diagram illustrating one embodiment for delivering a mobile terminated call to a mobile station during an inter-VLR location update;
FIGURE 4 is a flowchart illustrating an exemplary process for delivering a mobile terminated call to a mobile station during an inter-VLR location update according to the embodiment shown in FIGURE 3;
FIGURE 5 is a signaling diagram illustrating exemplary signaling for delivering a mobile terminated call to a mobile station according to the embodiment shown in FIGURE 3;
FIGURE 6 is a block diagram illustrating another embodiment for delivering a mobile terminated call to a mobile station during an inter-VLR location update;
FIGURE 7 is a flowchart illustrating an exemplary process for delivering a mobile terminated call to a mobile station during an inter-VLR location update according to the embodiment shown in FIGURE 6; and FIGURES 8A and 8B are signaling diagrams illustrating exemplary signaling for delivering a mobile terminated call to a mobile station according to the embodiment shown in FIGURE 6.
DETAILED DESCRIPTION OF THE DRAWINGS
FIGURE 1 is a block diagram illustrating an exemplary wireless network 10 for delivering a mobile terminated call 20 to a mobile station 80 during an inter- VLR location update, in accordance with embodiments of the present invention. The wireless network 10 includes a Gateway Mobile Switching Center (GMSC) 30, Mobile Switching Center/Visitor Location Registers (MSC/VLR) 50 and 60, Base Station System (BSS) 70 and Home Location Register (HLR) 40. MSC/VLR 50 serves location area 55, while MSC/VLR 60 serves location area 65. It should be understood that each MSC/VLR 50 and 60 may serve multiple location areas. However, for simplicity, only one location area for each MSC/VLR is shown.
As illustrated in FIGURE 1, mobile station 80 has recently moved from location area 65 served by MSC/VLR 60 into location area 55 served by MSC/VLR 50. Thus, MSC/VLR 60 is labeled "old MSC/VLR", while MSC/VLR 50 is labeled "new MSC/VLR." Once the mobile station 80 realizes that it has roamed into the new location area 55 served by the new MSC/VLR 50 (i.e., by determining that the location area code (LAC) received from BSS 70 is new), the mobile station 80 sends a location update request to the new MSC/VLR 50 via BSS 70.
Upon receiving the location update request, the new MSC/VLR 50 transmits an update location message to the HLR 40 to retrieve the subscriber data associated with the mobile station 80 and to update the HLR 40 with the new location area 55 served by the new MSC/VLR 50. In addition, the HLR 40 transmits a cancel location message to the old MSC/VLR 60 instructing the old MSC/VLR 60 to delete the mobile station's 80 subscriber data from its records since the mobile station 80 is no longer located in the location area 65 served by the old MSC/VLR 60.
If an incoming mobile terminated call 20 for the mobile station 80 is received at the GMSC 30 during the location update process, as in conventional wireless networks, the GMSC 30 queries the HLR 40 for routing information to deliver the incoming call to the mobile station 80. If the HLR 40 has not yet received the update location message from the new MSC/VLR 50 when the GMSC query is received, the HLR 40 returns the routing information for the old MSC/VLR 60 to the GMSC 30. Thus, the GMSC routes the mobile terminated call 20 to the old MSC/VLR 60 for call handling. When the old MSC/VLR 60 receives the call 20, the old MSC/VLR 60 accesses its subscriber data for the mobile subscriber to determine the location area 65 of the mobile station 80, and pages the mobile station 80 within that location area 65 to attempt to set-up a call connection to the mobile station 80 for the mobile terminated call. However, since the mobile station 80 has moved out of location area 65 and into location area 55, and is currently performing a location update to the new MSC/VLR 50, the mobile station 80 will not be able to answer the page from the old MSC/VLR.
Therefore, in accordance with embodiments of the present invention, once the old MSC/VLR 60 receives the cancel location message from the HLR 40 that requests the old MSC/VLR 60 to delete the subscriber record for mobile station 80, the MSC/VLR 60 stops paging the mobile station 80 and redirects the call 20 to enable the call 20 to be routed to the new MSC/VLR 50 and ultimately delivered to the mobile station 80 upon completion of the location update. For example, in one embodiment, the old MSC/VLR 60 queries the HLR 40 for new routing information for the mobile station 80, and uses the new routing information to forward the call to the new MSC/VLR 50. In another embodiment, the old MSC/VLR 60 releases the call back to the GMSC 30. The GMSC 30, in turn, re-queries the HLR 40 for new routing information for the mobile station 80 and uses the new routing information to re-route the call to the new MSC/VLR 50. Turning now to FIGURE 2, an exemplary process 200 for delivering a mobile terminated call to a mobile station during an inter- VLR location update is shown. Initially, at block 210, a mobile terminated call to a mobile station is received with routing information identifying the old MSC/VLR as the serving MSC/VLR. For example, in one embodiment, the mobile terminated call is received at the old MSC/VLR from the GMSC. In another embodiment, the mobile terminated call is received at the GMSC after being re-routed back to the GMSC from the old MSC/VLR. In addition, at block 220, a determination is made that the mobile station is currently performing a location update to a new MSC/VLR (e.g., by receiving a cancel location message at the old MSC/VLR or by releasing the call back to the GMSC). Thereafter, at block 230, the mobile terminated call is routed to the new MSC/VLR either directly from the old MSC/VLR or from the GMSC, as will be described in further detail below.
FIGURE 3 is a block diagram illustrating one embodiment for delivering a mobile terminated call to a mobile station during an inter- VLR location update. In FIGURE 3, the mobile terminated call is routed from the old MSC/VLR 60 to the new MSC/VLR 50 for delivery of the call to the mobile station. Initially, when the GMSC 30 first receives the incoming mobile terminated call from the network, the GMSC 30 sends a Send Routing Information (SRI) message 305 to the HLR 40. The HLR 40 accesses the subscriber record for the mobile station to determine the serving MSC/VLR, here the old MSC/VLR 60, and transmits a Provide Roaming Number (PRN) message 310 to the old MSC/VLR 60. In response to the PRN message, the old MSC/VLR 60 sends a message 315 including a Mobile Station Roaming Number (MSRN) back to the HLR 40. The MSRN is an E.164 number that is temporarily assigned to the mobile station for the mobile terminated call and can be used to route the mobile terminated call to the old MSC/VLR 60. Upon receipt of the MSRN, the HLR 40 forwards the MSRN in another message 320 back to the GMSC 30. The GMSC 30 uses the MSRN to route an Initial Address Message (IAM) 325 for the mobile terminated call to the old MSC/VLR 60.
At the same time that the GMSC 30 is retrieving the MSRN from the HLR 40 and transmitting the IAM 325 to the old MSC/VLR 60, as shown in FIGURE 3, the new MSC/VLR 50 is transmitting an update location message 328 for the mobile station to the HLR 40. As a result, the HLR 40 transmits a cancel location message 330 to the old MSC/VLR 60. In accordance with embodiments of the present invention, upon receiving the cancel location message 330 from the HLR 40, the old MSC/VLR 60 transmits a second Send Routing Information (SRI) message 335 to the HLR 40 for the mobile terminated call. This time, since the mobile station has performed the location update to the new MSC/VLR 50, the HLR 40 sends a Provide Roaming Number (PRN) message 340 to the new MSC/VLR 50 to retrieve a new MSRN in message 345 for the mobile terminated call from the new MSC/VLR 50. The HLR 40 forwards the MSRN for the new MSC/VLR 50 in message 350 to the old MSC/VLR 60, and the old MSC/VLR 60 uses the received MSRN to route an IAM 355 for the mobile terminated call to the new MSC/VLR 50. FIGURE 4 is a flowchart illustrating an exemplary process 400 for delivering a mobile terminated call to a mobile station during an inter- VLR location update according to the embodiment shown in FIGURE 3. When, at block 410, an IAM for a mobile terminated call to a mobile station is received at an old MSC/VLR, and at block 420, a cancel location message for the mobile station is also received at the old MSC/VLR, at block 430, the old MSC/VLR sends an SRI message to the HLR to retrieve the MSRN of the mobile station for the new MSC/VLR. Upon receiving the MSRN at block 440, at block 450, the old MSC/VLR uses the MSRN to forward the IAM for the mobile terminated call to the new MSC/VLR. FIGURE 5 is a signaling diagram illustrating exemplary signaling for delivering a mobile terminated call to a mobile station according to the embodiment shown in FIGURE 3. As described above in connection with FIGURE 3, when the GMSC 30 receives a mobile terminated call for a mobile station, at 500, the GMSC 30 transmits a Send Routing Information (SRI) message to the HLR 40 to retrieve routing information for routing of the call to the serving MSC/VLR. The HLR 40 accesses the subscriber record for the mobile station to identify the serving MSC/VLR (i.e., old MSC/VLR 60) and transmits a Provide Roaming Number (PRN) message at 502 to the old MSC/VLR 60.
In response, the old MSC/VLR 60 transmits a PRN acknowledgment message at 504 back to the HLR that includes a Mobile Station Roaming Number (MSRN) for the mobile terminated call. The HLR 40 forwards the MSRN to the GMSC 30 in an SRI acknowledgment message at 506. Using the received MSRN, the GMSC 30 generates and transmits an Initial Address Message (IAM) at 508 for the call to the old MSC/VLR 60. Upon receipt of the IAM, the old MSC/VLR accesses the temporary subscriber record for the mobile station to determine the location area within which the mobile station last reported it was located, and at 510, pages the mobile station within that location area. Prior to paging by the old MSC/VLR 60, the mobile station 80 transmits a location update request at 512 to the new MSC/VLR 50. After authentication of the mobile station 80 at 514, the new MSC/VLR 50 transmits an update location message at 516 to the HLR 40 to update the HLR 40 with the new location (i.e., new MSC/VLR identity and/or new location area) of the mobile station 80. Upon receiving the update location message, the HLR 40 transmits a cancel location message at 518 to the old MSC/VLR 60, requesting the old MSC/VLR to delete the temporary subscriber record for the mobile station. Once the old MSC/VLR deletes the subscriber record for the mobile station, the old MSC/VLR transmits a cancel location acknowledgement message at 520 back to the HLR 40. In addition, in accordance with embodiments of the present invention, at 522, the old MSC/VLR stops paging the mobile station (e.g., by stopping the paging timer for the mobile station) and initiates a second SRI message at 524 for the mobile terminated call to the HLR 40. In other embodiments, if the cancel location message is received during the pre-paging (i.e., before PRN ACK at 504), the old MSC/VLR 60 stops paging and returns the PRN acknowledgement message (at 504) to the HLR 40 with an indication that the mobile subscriber is absent (i.e., "Absent Subscriber"). In this case, the HLR 40 re-transmits the PRN message to the new MSC/VLR 50, and sends the MSRN associated with the new MSC/VLR 50 back to the GMSC 30. In yet another embodiment, if the cancel location message is received before the IAM arrives but after the PRN ACK is sent, the old MSC/VLR 60 triggers the second SRI message to the HLR 40 at Send Info for Incoming Call. In still another embodiment, if the cancel location message is received before paging, but after the Send Info for Incoming Call message, the old MSC/VLR 60 triggers the second SRI message to the HLR 40 without paging.
When the HLR 40 receives the second SRI message for the mobile terminated call from the old MSC/VLR 60 at 524, if the HLR is still processing the location update for the mobile station, at 526, the HLR 40 delays sending out the Provide Roaming Number (PRN) message to the new MSC/VLR 50 until the location update is complete. For example, as shown at 528, multiple insert subscriber data messages are sent from the HLR 40 to the new MSC/VLR 50 during the location update process to provide the new MSC/VLR with the subscriber data associated with the mobile station 80. In addition, each time the new MSC/VLR 50 receives subscriber data for the mobile station from the HLR 40, the new MSC/VLR 50 provides an insert subscriber data acknowledgement message at 530 back to the HLR 40.
Once all of the subscriber data for the mobile station has been sent to the new MSC/VLR 50, and the location update is complete, the HLR 40 transmits an update location acknowledgement message at 532 to the new MSC/VLR 50. Afterwards, the HLR 40 is able to transmit a Provide Roaming Number (PRN) message at 534 to the new MSC/VLR 50. In response, the new MSC/VLR 50 transmits a PRN acknowledgment message at 536 back to the HLR 40 that includes a new Mobile Station Roaming Number (MSRN) for the mobile terminated call. The HLR 40 forwards the new MSRN to the old MSC/VLR 60 in a second SRI acknowledgment message at 538. Using the received new MSRN, the old MSC/VLR 60 generates and transmits an Initial Address Message (IAM) at 540 for the call to the new MSC/VLR 50.
At 542, the new MSC/VLR 50 delays setup of the call to the mobile station until the location update procedure finishes. For example, the new MSC/VLR 50 may need to transmit a location update accept message at 544 that assigns a new Temporary Mobile Subscriber Identity (TMSI) to the mobile station for the new MSC/VLR 50. In addition, at 546, the mobile station 80 may need to reply back that the TMSI allocation has been completed. Thereafter, the new MSC/VLR can use the existing connection (used for location update) to the mobile station 80 or page the mobile station 80 and at 548 transmit a call setup message to the mobile station. At 550, a call confirmation message is transmitted back to the new MSC/VLR 50 from the mobile station 80. Normal mobile terminated call procedure follows at 552 to connect the mobile terminated call to the mobile station 80.
FIGURE 6 is a block diagram illustrating another embodiment for delivering a mobile terminated call to a mobile station during an inter- VLR location update. In FIGURE 6, the mobile terminated call is routed back to the GMSC 30 from the old MSC/VLR 60, and re-routed from the GMSC 30 to the new MSC/VLR 50 for delivery of the call to the mobile station. As in FIGURE 3, in FIGURE 6, when the GMSC 30 first receives the incoming mobile terminated call from the network, the GMSC 30 sends a Send Routing Information (SRI) message 605 to the HLR 40. The HLR 40 accesses the subscriber record for the mobile station to determine the serving MSC/VLR, here the old MSC/VLR 60, and transmits a Provide Roaming Number (PRN) message 610 to the old MSC/VLR 60. In response to the PRN message, the old MSC/VLR 60 sends a message 615 including a Mobile Station Roaming Number (MSRN) for the mobile terminated call to be used in routing to the old MSC/VLR 60 back to the HLR 40. Upon receipt of the MSRN, the HLR 40 forwards the MSRN in another message 620 back to the GMSC 30. The GMSC 30 uses the MSRN to route an Initial Address Message (IAM) 625 for the mobile terminated call to the old MSC/VLR 60.
At the same time that the GMSC 30 is retrieving the MSRN from the HLR 40 and transmitting the IAM 625 to the old MSC/VLR 60, as shown in FIGURE 6, the new MSC/VLR 50 is transmitting an update location message 628 for the mobile station to the HLR 40. As a result, the HLR 40 transmits a cancel location message 630 to the old MSC/VLR 60. In accordance with embodiments of the present invention, upon receiving the cancel location message 630 from the HLR 40, the old MSC/VLR 60 transmits a resume call handling (RCH) message 635 back to the HLR 40. The RCH message 635 includes a call reference number that identifies the mobile terminated call and a roaming retry indicator that instructs the GMSC 30 to obtain a new MSRN and re-route the mobile terminated call.
Therefore, the GMSC 30 sends a second Send Routing Information (SRI) message 640 to the HLR 40 for the mobile terminated call. This time, since the mobile station has performed the location update to the new MSC/VLR 50, the HLR 40 sends a Provide Roaming Number (PRN) message 645 to the new MSC/VLR 50 to retrieve a new MSRN in message 650 for the mobile terminated call from the new MSC/VLR 50. The HLR 40 forwards the MSRN for the new MSC/VLR 50 in message 655 to the GMSC 30, and the GMSC 30 uses the received MSRN to route an IAM 660 for the mobile terminated call to the new MSC/VLR 50. FIGURE 7 is a flowchart illustrating an exemplary process 700 for delivering a mobile terminated call to a mobile station during an inter- VLR location update according to the embodiment shown in FIGURE 6. As shown in FIGURE 7, when, at block 710, an IAM for a mobile terminated call to a mobile station is received at an old MSC/VLR from the GMSC, and at block 720, a cancel location message for the mobile station is also received at the old MSC/VLR, at block 730, the old MSC/VLR sends an Resume Call Handling (RCH) message with the roaming retry indicator back to the GMSC, which instructs the GMSC to obtain a new MSRN associated with the new MSC/VLR and to reroute the mobile terminated call to the new MSC/VLR using the new MSRN. FIGURES 8A and 8B are signaling diagrams illustrating exemplary signaling for delivering a mobile terminated call to a mobile station according to the embodiment shown in FIGURE 6. As described above in connection with FIGURE 6, when the GMSC 30 receives a mobile terminated call for a mobile station, at 800, the GMSC 30 transmits a Send Routing Information (SRI) message with the address of the GMSC 30 and a call reference for the mobile terminated call to the HLR 40 to retrieve routing information for routing of the call to the serving MSC/VLR. The HLR 40 accesses the subscriber record for the mobile station to identify the serving MSC/VLR (i.e., old MSC/VLR 60) and transmits a Provide Roaming Number (PRN) message at 802 to the old MSC/VLR 60. In response, the old MSC/VLR 60 transmits a PRN acknowledgment message at
804 back to the HLR 40 that includes a Mobile Station Roaming Number (MSRN) for the mobile terminated call. The HLR 40 forwards the MSRN to the GMSC 30 in an SRI acknowledgment message at 806. Using the received MSRN, the GMSC 30 generates and transmits an Initial Address Message (IAM) at 808 for the call to the old MSC/VLR 60. Upon receipt of the IAM, the old MSC/VLR 60 accesses the temporary subscriber record for the mobile station to determine the location area within which the mobile station last reported it was located, and at 810, pages the mobile station within that location area.
Prior to paging by the old MSC/VLR 60, the mobile station 80 transmits a location update request at 812 to the new MSC/VLR 50. After authentication of the mobile station 80 at 814, the new MSC/VLR 50 transmits an update location message at 816 to the HLR 40 to update the HLR 40 with the new location (i.e., new MSC/VLR identity and/or new location area) of the mobile station 80. Upon receiving the update location message, the HLR 40 transmits a cancel location message at 818 to the old MSC/VLR 60, requesting the old MSC/VLR to delete the temporary subscriber record for the mobile station. Once the old MSC/VLR 60 deletes the subscriber record for the mobile station, the old MSC/VLR 60 transmits a cancel location acknowledgement message at 820 back to the HLR 40.
In addition, in accordance with embodiments of the present invention, at 822, the old MSC/VLR stops paging the mobile station (e.g., by stopping the paging timer for the mobile station) and informs the GMSC 30 that the mobile station has roamed into a new location area served by a new MSC/VLR 50. In particular, the old MSC/VLR 60 transmits a resume call handling (RCH) message at 826 to the GMSC 30. The RCH message includes the call reference identifying the mobile terminated call and a roaming retry indicator that informs the GMSC 30 that a new MSRN is needed for the mobile terminated call. An example of the parameters within the RCH message is shown below in Table 1.
Table 1 : MAP_RESUME_CALL_HANDLING parameters
Figure imgf000021_0001
Although in FIGURE 8A, the call redirection is handled by the old MSC/VLR after receipt of the IAM at 808, in other embodiments, if the cancel location message is received during the pre-paging (i.e., before PRN ACK at 804), the old MSC/VLR 60 stops paging and returns the PRN acknowledgement message (at 804) to the HLR 40 with an indication that the mobile subscriber is absent (i.e., "Absent Subscriber"). In this case, the HLR 40 re-transmits the PRN message to the new MSC/VLR 50, and sends the MSRN associated with the new MSC/VLR 50 back to the GMSC 30. In yet another embodiment, if the cancel location message is received before the IAM arrives but after the PRN ACK is sent, the old MSC/VLR 60 triggers the RCH with roaming retry to the GMSC during the Send Info for Incoming Call after the IAM is received. In still another embodiment, if the cancel location message is received before paging, but after the Send Info for Incoming Call message, the old MSC/VLR 60 triggers the RCH instead of paging.
In any case, when the GMSC 30 receives the RCH message from the old MSC/VLR 60, the GMSC 30 transmits an RCH acknowledgement message at 828 back to the old MSC/VLR 60. In addition, at 830, the GMSC 30 instructs the old MSC/VLR 60 to release the call, and in response, the old MSC/VLR 60 releases the call and at 832 transmits a release complete message back to the GMSC. Thereafter, the GMSC 30 transmits a second SRI message for the mobile terminated call at 834 to the HLR 40. When the HLR 40 receives the second SRI message from the GMSC at 834, if as shown in FIGURE 8B, the HLR 40 is still processing the location update for the mobile station, at 836, the HLR 40 delays sending out the Provide Roaming Number (PRN) message to the new MSC/VLR 50 until the location update is complete. For example, as shown at 824 and 838, multiple insert subscriber data messages are sent from the HLR 40 to the new MSC/VLR 50 during the location update process to provide the new MSC/VLR with the subscriber data associated with the mobile station 80. In addition, each time the new MSC/VLR 50 receives subscriber data for the mobile station from the HLR 40, the new MSC/VLR 50 provides an insert subscriber data acknowledgement message back to the HLR 40. Once all of the subscriber data for the mobile station has been sent to the new
MSC/VLR 50, and the location update is complete, the HLR 40 transmits an update location acknowledgement message at 840 to the new MSC/VLR 50. Afterwards, the HLR 40 is able to transmit a Provide Roaming Number (PRN) message at 842 to the new MSC/VLR 50. In response, the new MSC/VLR 50 transmits a PRN acknowledgment message at 844 back to the HLR 40 that includes a new Mobile Station Roaming Number (MSRN) for the mobile terminated call. The HLR 40 forwards the new MSRN to the GMSC 30 in a second SRI acknowledgment message at 846. Using the received new MSRN, the GMSC 30 generates and transmits an Initial Address Message (IAM) at 848 for the call to the new MSC/VLR 50.
At 850, the new MSC/VLR 50 delays setup of the call to the mobile station until the location update procedure finishes. For example, the new MSC/VLR 50 may need to transmit a location update accept message at 852 that assigns a new Temporary Mobile Subscriber Identity (TMSI) to the mobile station for the new MSC/VLR 50. In addition, at 854, the mobile station 80 may need to reply back that the TMSI allocation has been completed. Thereafter, the new MSC/VLR can use the existing connection (used for location update) to the mobile station 80 or page the mobile station 80 and at 856 transmit a call setup message to the mobile station. At 858, a call confirmation message is transmitted back to the new MSC/VLR 50 from the mobile station 80. Normal mobile terminated call procedure follows at 860 to connect the mobile terminated call to the mobile station 80.
As will be recognized by those skilled in the art, the innovative concepts described in the present application can be modified and varied over a wide range of applications. Accordingly, the scope of patents subject matter should not be limited to any of the specific exemplary teachings discussed, but is instead defined by the following claims.

Claims

WE CLAIM:
1. An apparatus for enabling delivery of a mobile terminated call to a mobile device communicating with a wireless communication network, said apparatus comprising: means for receiving said mobile terminated call for said mobile device, said mobile terminated call having old routing information associated therewith that identifies an old mobile switching center/visitor location register (MSC/VLR) previously serving said mobile device; means for determining said mobile device is performing a location update to a new MSC/VLR prior to connection of said mobile terminated call to said mobile device; and means for enabling said mobile terminated call to be routed to said new MSC/VLR for connection of said mobile terminated call to said mobile device.
2. The apparatus of Claim 1, wherein said apparatus is said old MSC/VLR.
3. The apparatus of Claim 1, wherein said means for determining said mobile device is performing a location update to said new MSC/VLR further comprises: means for receiving a cancel location message from a Home Location Register (HLR) associated with said mobile device.
4. The apparatus of Claim 3, wherein said means for enabling said mobile terminated call to be routed to said new MSC/VLR further comprises: means for determining new routing information for said mobile terminated call that identifies said new MSC/VLR; and means for routing said mobile terminated call to said new MSC/VLR for connection of said mobile terminated call to said mobile device.
5. The apparatus of Claim 3, wherein said means for enabling said mobile terminated call to be routed to said new MSC/VLR further comprises: means for sending a resume call handling (RCH) message to a gateway mobile switching center (GMSC) that originally routed said mobile terminated call to said old MSC/VLR, said RCH message including a roaming retry indicator instructing said GMSC to re-route said mobile terminated call to said new MSC/VLR; and means for releasing said mobile terminated call.
6. The apparatus of Claim 1, wherein said apparatus is a gateway mobile switching center (GMSC) in communication with said old MSC/VLR and said new MSC/VLR.
7. The apparatus of Claim 6, wherein said means for determining said mobile device is performing a location update to said new MSC/VLR further comprises: means for receiving a resume call handling (RCH) message from said old MSC/VLR, said RCH message including a roaming retry indicator instructing said GMSC to re-route said mobile terminated call to said new MSC/VLR.
8. The apparatus of Claim 7, wherein said means for enabling said mobile terminated call to be routed to said new MSC/VLR further comprises: means for determining new routing information for said mobile terminated call that identifies said new MSC/VLR; and means for routing said mobile terminated call to said new MSC/VLR for connection of said mobile terminated call to said mobile device.
9. A method for delivering a mobile terminated call to a mobile device communicating with a wireless communication network, said method comprising: receiving said mobile terminated call for said mobile device, said mobile terminated call having old routing information associated therewith that identifies an old mobile switching center/visitor location register (MSC/VLR) previously serving said mobile device; determining said mobile device is performing a location update to a new MSC/VLR prior to connection of said mobile terminated call to said mobile device; and enabling said mobile terminated call to be routed to said new MSC/VLR for connection of said mobile terminated call to said mobile device.
10. The method of Claim 9, wherein said determining said mobile device is performing a location update to said new MSC/VLR further comprises: receiving a cancel location message from a Home Location Register (HLR) associated with said mobile device.
11. The method of Claim 10, wherein said receiving said cancel location message further comprises: receiving said cancel location message during pre-paging of said mobile device; and returning a provide routing number (PRN) acknowledgment message indicating said mobile device is an absent subscriber to said HLR.
12. The method of Claim 10, wherein said enabling said mobile terminated call to be routed to said new MSC/VLR further comprises: determining new routing information for said mobile terminated call that identifies said new MSC/VLR; and routing said mobile terminated call to said new MSC/VLR for connection of said mobile terminated call to said mobile device.
13. The method of Claim 12, wherein said determining said new routing information for said mobile terminated call further comprises: sending a send routing information (SRI) message to said HLR; and receiving a SRI acknowledgement message including a mobile station routing number (MSRN) for said mobile device from said HLR.
14. The method of Claim 13, wherein said sending said SRI message to said HLR further comprises: sending said SRI message without paging said mobile device.
15. The method of Claim 13, wherein said sending said SRI message to said HLR further comprises: stopping paging of said mobile device; and sending said SRI message to said HLR.
16. The method of Claim 10, wherein said enabling said mobile terminated call to be routed to said new MSC/VLR further comprises: sending a resume call handling (RCH) message to a gateway mobile switching center (GMSC) that originally routed said mobile terminated call to said old MSC/VLR, said RCH message including a roaming retry indicator instructing said GMSC to re-route said mobile terminated call to said new MSC/VLR; and releasing said mobile terminated call.
17. The method of Claim 16, wherein said sending said RCH message to said GMSC further comprises: sending said RCH message without paging said mobile device.
18. The method of Claim 16, wherein said sending said RCH message to said GMSC further comprises: stopping paging of said mobile device; and sending said RCH message to said GMSC.
19. The method of Claim 9, wherein said determining said mobile device is performing a location update to said new MSC/VLR further comprises: receiving a resume call handling (RCH) message at a gateway mobile switching center (GMSC) from said old MSC/VLR, said RCH message including a roaming retry indicator instructing said GMSC to re-route said mobile terminated call to said new MSC/VLR.
20. The method of Claim 19, wherein said enabling said mobile terminated call to be routed to said new MSC/VLR further comprises: determining new routing information for said mobile terminated call that identifies said new MSC/VLR; and routing said mobile terminated call to said new MSC/VLR for connection of said mobile terminated call to said mobile device.
21. A resume call handling (RCH) message originated by a mobile switching center/visitor location register (MSC/VLR) within a wireless communications network and transmitted over said wireless communications network to a gateway mobile switching center, said RCH message comprising: a call reference number associated with a mobile terminated call destined for a mobile device within said wireless communication network; and a roaming retry indicator instructing said GMSC to re-route said mobile terminated call to a new MSC/VLR.
PCT/US2007/078309 2006-09-12 2007-09-12 Delivery of mobile terminated call during inter-vlr location update WO2008033951A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07842364A EP2069949B1 (en) 2006-09-12 2007-09-12 Delivery of mobile terminated call during inter-vlr location update

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US82529106P 2006-09-12 2006-09-12
US60/825,291 2006-09-12

Publications (2)

Publication Number Publication Date
WO2008033951A2 true WO2008033951A2 (en) 2008-03-20
WO2008033951A3 WO2008033951A3 (en) 2008-07-10

Family

ID=39184565

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/078309 WO2008033951A2 (en) 2006-09-12 2007-09-12 Delivery of mobile terminated call during inter-vlr location update

Country Status (2)

Country Link
EP (1) EP2069949B1 (en)
WO (1) WO2008033951A2 (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2099239A1 (en) * 2008-03-07 2009-09-09 Nokia Siemens Networks Oy Apparatus and method for call routing information
WO2010003374A1 (en) * 2008-07-10 2010-01-14 中兴通讯股份有限公司 Method and corresponding terminal for association relationship updating
EP2285157A1 (en) * 2008-05-28 2011-02-16 ZTE Corporation A roaming retrying method under pre-paging mode
GB2477962A (en) * 2010-02-22 2011-08-24 Nec Corp Connection-maintaining request during a mobile terminated procedure
WO2012045377A1 (en) * 2010-10-05 2012-04-12 Telefonaktiebolaget L M Ericsson (Publ) Technique for connection attempt handling in a circuit switched fallback situation
WO2012045375A1 (en) * 2010-10-05 2012-04-12 Telefonaktiebolaget L M Ericsson (Publ) Technique for terminating call set up in a csfb situation
WO2012099865A1 (en) * 2011-01-21 2012-07-26 Alcatel-Lucent Usa Inc. Mobile terminating roaming forwarding for mobile communications devices
US20120202488A1 (en) * 2009-12-04 2012-08-09 Zte Corporation Method for Triggering Roaming Retry and Home Location Register
US20130212284A1 (en) * 2010-10-06 2013-08-15 Nokia Siemens Networks Oy Method and apparatus for maintaining information about subscription servers
WO2014029409A1 (en) * 2012-08-24 2014-02-27 Telefonaktiebolaget L M Ericsson (Publ) Technique for operating a network node during a mobile terminating roaming forwarding procedure
CN104768141A (en) * 2014-01-07 2015-07-08 阿尔卡特朗讯 Method of using CAMEL session service, device and system
US9420439B2 (en) 2011-05-03 2016-08-16 Huawei Technologies Co., Ltd. Method and apparatus for receiving or sending short message
US10674171B2 (en) 2011-09-27 2020-06-02 Telefonaktiebolaget Lm Ericsson (Publ) Decoders and methods thereof for managing pictures in video decoding process
US11570610B2 (en) 2020-04-03 2023-01-31 Telus Communications Inc. System and method for managing visitor location register (VLR) records by updating duplicate records

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6950876B2 (en) * 2001-03-19 2005-09-27 Lucent Technologies Inc. Multiple-protocol home location register and method of use

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of EP2069949A4 *

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2099239A1 (en) * 2008-03-07 2009-09-09 Nokia Siemens Networks Oy Apparatus and method for call routing information
EP2285157A1 (en) * 2008-05-28 2011-02-16 ZTE Corporation A roaming retrying method under pre-paging mode
EP2285157A4 (en) * 2008-05-28 2011-09-28 Zte Corp A roaming retrying method under pre-paging mode
US8351931B2 (en) 2008-05-28 2013-01-08 Zte Corporation Roaming retrying method under pre-paging mode
WO2010003374A1 (en) * 2008-07-10 2010-01-14 中兴通讯股份有限公司 Method and corresponding terminal for association relationship updating
US8718653B2 (en) 2008-07-10 2014-05-06 Zte Corporation Method and terminal for association update
EP2509360A1 (en) * 2009-12-04 2012-10-10 ZTE Corporation Method for triggering roaming retry and home location register
EP2509360A4 (en) * 2009-12-04 2014-03-05 Zte Corp Method for triggering roaming retry and home location register
US20120202488A1 (en) * 2009-12-04 2012-08-09 Zte Corporation Method for Triggering Roaming Retry and Home Location Register
US8718640B2 (en) * 2009-12-04 2014-05-06 Zte Corporation Method for triggering roaming retry and a home location register
US10136467B2 (en) 2010-02-22 2018-11-20 Lenovo Innovations Limited (Hong Kong) Mobile terminated control method and related network devices
GB2477962A (en) * 2010-02-22 2011-08-24 Nec Corp Connection-maintaining request during a mobile terminated procedure
CN103222330A (en) * 2010-10-05 2013-07-24 瑞典爱立信有限公司 Technique for connection attempt handling in a circuit switched fallback situation
US20130288671A1 (en) * 2010-10-05 2013-10-31 Ralf Keller Technique for Terminating Call Set Up in a CSFB Situation
CN106304214B (en) * 2010-10-05 2019-08-23 瑞典爱立信有限公司 The routing node and its method of processing are attempted in connection in the case of circuit switched fallback
US10231278B2 (en) * 2010-10-05 2019-03-12 Telefonaktiebolaget Lm Ericsson (Publ) Technique for terminating call set up in a CSFB situation
US9538574B2 (en) 2010-10-05 2017-01-03 Telefonaktiebolaget L M Ericsson (Publ) Technique for terminating call set up in a CSFB situation
WO2012045377A1 (en) * 2010-10-05 2012-04-12 Telefonaktiebolaget L M Ericsson (Publ) Technique for connection attempt handling in a circuit switched fallback situation
WO2012045375A1 (en) * 2010-10-05 2012-04-12 Telefonaktiebolaget L M Ericsson (Publ) Technique for terminating call set up in a csfb situation
US9781762B2 (en) 2010-10-05 2017-10-03 Telefonaktiebolaget Lm Ericsson (Publ) Technique for connection attempt handling in a circuit switched fallback situation
US20170099695A1 (en) * 2010-10-05 2017-04-06 Telefonaktiebolaget Lm Ericsson (Publ) Technique for Terminating Call Set Up in a CSFB Situation
CN106304214A (en) * 2010-10-05 2017-01-04 瑞典爱立信有限公司 Treatment technology is attempted in connection in the case of circuit switched fallback
US9161268B2 (en) 2010-10-05 2015-10-13 Telefonaktiebolaget L M Ericsson (Publ) Technique for connection attempt handling in a circuit switched fallback situation
US20130212284A1 (en) * 2010-10-06 2013-08-15 Nokia Siemens Networks Oy Method and apparatus for maintaining information about subscription servers
JP2014503164A (en) * 2011-01-21 2014-02-06 アルカテル−ルーセント Mobile incoming roaming transfer for mobile communication devices
US8948735B2 (en) 2011-01-21 2015-02-03 Alcatel Lucent Mobile termination roaming forwarding for mobile devices
WO2012099865A1 (en) * 2011-01-21 2012-07-26 Alcatel-Lucent Usa Inc. Mobile terminating roaming forwarding for mobile communications devices
CN103828410A (en) * 2011-01-21 2014-05-28 阿尔卡特朗讯公司 Mobile terminating roaming forwarding for mobile communications devices
KR101489786B1 (en) * 2011-01-21 2015-02-11 알까뗄 루슨트 Mobile terminating roaming forwarding for mobile communications devices
CN103828410B (en) * 2011-01-21 2017-09-08 阿尔卡特朗讯公司 For the mobile-terminated roaming forwarding of mobile communication equipment
US9713114B2 (en) 2011-05-03 2017-07-18 Huawei Technologies Co., Ltd. Method and apparatus for receiving or sending short message
US9420439B2 (en) 2011-05-03 2016-08-16 Huawei Technologies Co., Ltd. Method and apparatus for receiving or sending short message
US10674171B2 (en) 2011-09-27 2020-06-02 Telefonaktiebolaget Lm Ericsson (Publ) Decoders and methods thereof for managing pictures in video decoding process
US10893288B2 (en) 2011-09-27 2021-01-12 Telefonaktiebolaget Lm Ericsson (Publ) Decoders and methods thereof for managing pictures in video decoding process
WO2014029409A1 (en) * 2012-08-24 2014-02-27 Telefonaktiebolaget L M Ericsson (Publ) Technique for operating a network node during a mobile terminating roaming forwarding procedure
US9374702B2 (en) 2012-08-24 2016-06-21 Telefonaktiebolaget Lm Ericsson (Publ) Technique for operating a network node during a mobile terminating roaming forwarding procedure
CN104768141A (en) * 2014-01-07 2015-07-08 阿尔卡特朗讯 Method of using CAMEL session service, device and system
US11570610B2 (en) 2020-04-03 2023-01-31 Telus Communications Inc. System and method for managing visitor location register (VLR) records by updating duplicate records

Also Published As

Publication number Publication date
EP2069949B1 (en) 2012-08-22
WO2008033951A3 (en) 2008-07-10
EP2069949A2 (en) 2009-06-17
EP2069949A4 (en) 2011-09-07

Similar Documents

Publication Publication Date Title
EP2069949B1 (en) Delivery of mobile terminated call during inter-vlr location update
EP0542963B1 (en) Method for establishing an inbound call to the mobile telephone in a cellular mobile telephone network
EP0667087B1 (en) Method and arrangement for processing short messages in a cellular network
JP5795084B2 (en) Mobile incoming roaming transfer for mobile communication devices
AU730984B2 (en) Emergency call back for roaming mobile radio subscribers
US6898433B1 (en) Location management for cellular systems
US20030027572A1 (en) Method and system for primary paging location of mobile terminal
CA2274622C (en) Method of controlling paging in a plurality of mobile switching centers in a radio telecommunications network
JPH08501669A (en) How to start sending short messages
EP0520049B1 (en) A method for setting up an incoming call to a mobile radio in a cellular mobile radio network
US6738629B1 (en) Method for flood paging in a telecommunications network
US6968196B1 (en) Location area update in a communication system
US9949110B2 (en) Avoiding formation of a call loop resulting from handling of a mobile terminated call in parallel with a location update in a wireless communication network
US8351962B2 (en) Logical paging areas
EP2052569B1 (en) Mobile switching centre handover
JP4105455B2 (en) Method and apparatus for identifying access technologies
US6782254B1 (en) Handling of forward-to numbers across regional and political boundaries
WO1999053711A1 (en) Local call termination handling in a radio telecommunications network

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07842364

Country of ref document: EP

Kind code of ref document: A2

WWE Wipo information: entry into national phase

Ref document number: 2007842364

Country of ref document: EP

NENP Non-entry into the national phase in:

Ref country code: DE