WO2005086385A1 - Procede de transfert de terminal de communication mobile dans un reseau de communications mobile hybride de reseau de communications asynchrone et synchrone - Google Patents

Procede de transfert de terminal de communication mobile dans un reseau de communications mobile hybride de reseau de communications asynchrone et synchrone Download PDF

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Publication number
WO2005086385A1
WO2005086385A1 PCT/KR2005/000682 KR2005000682W WO2005086385A1 WO 2005086385 A1 WO2005086385 A1 WO 2005086385A1 KR 2005000682 W KR2005000682 W KR 2005000682W WO 2005086385 A1 WO2005086385 A1 WO 2005086385A1
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WO
WIPO (PCT)
Prior art keywords
mobile communication
switching center
asynchronous
mobile switching
handover
Prior art date
Application number
PCT/KR2005/000682
Other languages
English (en)
Inventor
Jae-Young Ju
Sang-Yun Lee
Hee-Hyeok Hahm
Young-Ho Joo
Kyeong-Hee Han
Original Assignee
Sk Telecom Co., Ltd.
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
Priority claimed from KR1020040016287A external-priority patent/KR100612677B1/ko
Priority claimed from KR1020040016290A external-priority patent/KR100625658B1/ko
Priority claimed from KR1020040016291A external-priority patent/KR100612678B1/ko
Application filed by Sk Telecom Co., Ltd. filed Critical Sk Telecom Co., Ltd.
Priority to BRPI0508151-3A priority Critical patent/BRPI0508151A/pt
Priority to JP2007502721A priority patent/JP4657286B2/ja
Publication of WO2005086385A1 publication Critical patent/WO2005086385A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/24—Interfaces between hierarchically similar devices between backbone network devices

Definitions

  • the present invention relates to a method for handover in a mobile communication network, and more particularly to a method for handover of a mobile communication terminal by using an Interworking Interoperability Function (TIF) unit for signal exchange between asynchronous and synchronous mobile switching centers and a protocol (ISUP) for message transmission between the mobile switching centers in a hybrid mobile communication system including both an asynchronous network and a synchronous network.
  • TIF Interworking Interoperability Function
  • ISUP protocol
  • CDMA mobile communication system synchronous mobile communication system
  • WCD?MA mobile communication system asynchronous mobile communication system
  • DBDM Dual Band Dual Mode
  • Such a DBDM mobile communication terminal includes an antenna, a synchronous modem for a synchronous mobile communication service, an asynchronous modem for an asynchronous mobile communication service, and a common module.
  • the asynchronous mobile communication system is now in an initial stage of providing its service and requires an enormous investment for construction of the system. Therefore, the current asynchronous mobile communication system fails to provide service for a wide area and thus usually has a service area overlapping that of the synchronous mobile communication system. Due to such a limitation in the service area of the asynchronous mobile communication system, call connection may be in- terrupted when a subscriber of the asynchronous mobile communication system using the service of the asynchronous mobile communication system moves into an area of the synchronous mobile communication system which does not provide the asynchronous mobile communication service.
  • the present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a method for handover of a mobile communication terminal, which can provide continuous service without interruption of communication by using an Interworking Interoperability Function (IIF) unit for signal exchange between asynchronous and synchronous mobile switching centers and a protocol (ISUP) for message transmission between the mobile switching centers, when the mobile communication terminal moves into a synchronous mobile communication system area in a state in which the mobile communication terminal is using voice communication service.
  • IIF Interworking Interoperability Function
  • ISUP protocol
  • HF Interworking Interoperability Function
  • ISUP protocol
  • a method for handover of a dual-band dual-mode mobile communication terminal in a hybrid mobile communication system including both an asynchronous mobile communication system and a synchronous mobile communication system
  • the asynchronous mobile com- munication system including a node B, a radio network controller and an asynchronous mobile switching center
  • the synchronous mobile communication system including a base transceiver station, a base station controller and a synchronous mobile switching center
  • the asynchronous mobile switching center and synchronous mobile switching center being interconnected through an interworking interoperability function (IIF) unit and each being connected to a dual stack home location register (D-HLR),
  • IIF interworking interoperability function
  • D-HLR dual stack home location register
  • the mobile communication terminal being capable of communicating with both an asynchronous mobile communication system and a synchronous mobile communication system
  • the method comprising the steps of: (a) transmitting a handover request message to the asynchronous mobile switching center by the radio network controller in response to a handover request from the mobile communication terminal;
  • the handover request message and the handover instruction message include information reporting that the mobile communication terminal is in the state of waiting for a response.
  • the method may further comprise the steps of: (n) reporting connection of a call-terminating mobile communication terminal to the HF unit by the asynchronous mobile switching center, as the call-terminating mobile communication terminal responds; (o) transmitting an intersystem response message to the synchronous mobile switching center by the HF unit and reporting to the base transceiver station/base station controller by the synchronous mobile switching center that the call-terminating mobile communication terminal has responded and connected to the synchronous mobile switching center; and (p) transmitting a response signal to the intersystem response message to the IIF unit by the synchronous mobile switching center.
  • the handover request message and the handover instruction message include information reporting that the mobile communication terminal is in the alert state for the call termination.
  • the method may further comprise the steps of: (q) reporting connection of the mobile communication terminal to the synchronous mobile switching center by the base transceiver station/base station controller, as the mobile communication terminal in the alert state for the call termination responds; (r) transmitting an intersystem response message from the synchronous mobile switching center to the IIF unit and reporting to the asynchronous mobile switching center by the IIF unit that the mobile communication terminal has responded to an alert and connected to the synchronous mobile switching center; and (s) transmitting a response signal to the intersystem response message from the HF unit to the synchronous mobile switching center.
  • step (f) may comprise the steps of: transmitting an initial address message (IAM) from the asynchronous mobile switching center to the HF unit, the IAM being an ISUP message; and transmitting an address completion message (ACM) from the HF unit to the asynchronous mobile switching center, the ACM being an ISUP message.
  • IAM initial address message
  • ACM address completion message
  • step (m) may comprise the steps of: reporting completion of the handover to the synchronous mobile switching center by the base transceiver station/base station controller and reporting the completion of the handover to the IIF unit by the synchronous mobile switching center; requesting by the IIF unit to the asynchronous mobile switching center for release of connection and reporting by using an ISUP message connection between the synchronous mobile switching center and the mobile communication terminal; and releasing connection between the asynchronous mobile switching center and the node B/radio network controller.
  • the handover request message in step (a) comprises parameters including handover-related message used in the synchronous mobile communication system, neighbor cell information, neighbor base station information, message type, handover type, handover cause, source base station controller ID, target base station controller ID, Radio Access Bearer (RAB) information and wireless zone-related information.
  • handover-related message used in the synchronous mobile communication system
  • neighbor cell information neighbor base station information
  • message type handover type
  • handover cause source base station controller ID
  • target base station controller ID target base station controller ID
  • RAB Radio Access Bearer
  • the asynchronous mobile switching center determines with reference to the neighbor cell information and the neighbor base station information of the mobile communication terminal if the requested handover is handover between neighbor cells within the asynchronous mobile communication system or handover to the synchronous mobile communication system.
  • step (b) the asynchronous mobile switching center transmits an asynchronous identifier number (MSISDN) of the mobile communication terminal together with the handover request message.
  • MSISDN asynchronous identifier number
  • the subscriber information received by the IIF unit from the D-HLR includes a synchronous identifier (MIN, ESN) of the mobile communication terminal.
  • step (c) the HF unit requests transmission of the subscriber information by using one of a synchronous message and an asynchronous message.
  • the IIF unit generates a billing ID before transmitting the handover instruction message to the synchronous mobile switching center and inserts the billing ID and an internal switching center circuit ID (InterMSCCircuitlD) into the transmitted handover instruction message, the billing ID including an ID of a synchronous mobile switching center to which the asynchronous mobile switching center will connect.
  • an internal switching center circuit ID InterMSCCircuitlD
  • the handover request message transmitted from the IIF unit to the synchronous mobile switching center comprises parameters including a billing ID, ESN, an internal switching center circuit ID and MIN
  • the response message transmitted from the synchronous mobile switching center to the IIF unit comprises parameters including CDMA channel data and a CDMA channel list.
  • a resource allocation completion message transmitted to the radio network controller from the asynchronous mobile switching center comprises a message type, an RRC container and an RAB list to be released.
  • the access signal comprises an invoke ID, an application protocol data unit (APDU) and selected radio resource information.
  • APDU application protocol data unit
  • the message requesting release of the call connection comprises parameters including an internal switching center circuit ID, cause of release, a billing ID and MIN, and a response message to the message requesting release of the call connection comprises a billing ID.
  • the handover is performed by using an Interworking Interoperability Function (HF) unit for signal exchange between asynchronous and synchronous mobile switching centers and an ISUP (a protocol for message transmission between mobile switching centers). Therefore, the present invention can provide a high quality service regardless of the generation of the mobile communication system.
  • HF Interworking Interoperability Function
  • the present invention eliminates prevents construction of the asynchronous mobile communication system over an unnecessarily wide area and thus can reduce the investment necessary for design of the asynchronous mobile communication system.
  • FIG. 1 is a block diagram of a mobile communication network according to the present invention.
  • FIG. 2 is a block diagram for illustrating the concept of the handover of a mobile communication terminal during voice communication between an asynchronous network and a synchronous network according to the first embodiment of the present invention
  • FIG. 3 is a flowchart of a process for the handover of the mobile communication terminal during voice communication between an asynchronous network and a synchronous network according to the first embodiment of the present invention
  • FTGs. 4 through 17 are views showing parameters included in messages used for the handover according to the present invention.
  • FIG. 18 is a block diagram for illustrating the concept of the handover of a mobile communication terminal in a state of waiting for a response to a call between an asynchronous network and a synchronous network according to the second embodiment of the present invention
  • FTGs. 19 and 20 are a flowchart of a process for the handover of the mobile communication terminal in a state of waiting for a response to a call between an asynchronous network and a synchronous network according to the second embodiment of the present invention
  • FIG. 21 is a view showing parameters included in messages used for the handover according to the present invention.
  • FIG. 22 is a block diagram for illustrating the concept of the handover of a mobile communication terminal in an alert state for call termination between an asynchronous network and a synchronous network according to the third embodiment of the present invention.
  • FTGs. 23 and 24 are a flowchart of a process for the handover of the mobile communication terminal in an alert state for call termination between an asynchronous network and a synchronous network according to the third embodiment of the present invention. Best Mode for Carrying Out the Invention
  • FIG. 1 is a block diagram of a mobile communication network according to the present invention.
  • the mobile communication terminal 10 is a Dual-Band Dual-Mode (DBDM) mobile communication terminal capable of supporting both the asynchronous mobile communication service and the synchronous mobile communication service and includes a synchronous modem for the synchronous mobile communication service, an asynchronous modem for the asynchronous mobile communication service, and a common module. Therefore, the mobile communication terminal 10 can connect with either an asynchronous mobile communication system 20 or a synchronous mobile communication system 30 by wireless in order to use voice and data service provided by them.
  • DBDM Dual-Band Dual-Mode
  • the asynchronous mobile communication system 20 includes a node B/RNC 210, an asynchronous mobile switching center (MSC) 220, a General Packet Radio Service (GPRS) network 240, a serving GPRS Support Node (SGSN) 230, and a Gateway GPRS Support Node (GGSN) 250.
  • the node B/RNC 210 represents a node B serving as a base station for supporting wireless communication with the mobile communication terminal 10 or an RNC (Radio Network Controller) 210 for controlling the node B for wireless communication with the mobile communication terminal 10.
  • RNC Radio Network Controller
  • the asynchronous mobile switching center 220 is connected to the node B/RNC 210 and performs call exchange with the mobile communication terminal 10 through the node B/RNC 210 in order to provide service to the mobile communication terminal 10.
  • the SGSN 230 is connected between the node B/RNC 210 and the GPRS network 240 to keep tracking the position of the mobile communication terminal 10 and perform an access control and a security function.
  • the GGSN 250 is connected to the SGSN 230 through the GPRS network 240 and to an IP network 70 to support inter- working with outer systems for exchange of packet.
  • the synchronous mobile communication system 30 includes a BTS/BSC 310, a synchronous mobile switching center (MSC) 320, a PDSN 330, and a Data Core Network (DCN) 340.
  • the BTS/BSC 310 represents a BTS (Base Transceiver Station) for supporting wireless communication with the mobile communication terminal 10 or a BSC (Base Station Controller) for controlling the BTS for wireless communication with the mobile communication terminal 10.
  • the synchronous mobile switching center 320 is connected to and exchanges calls with at least one BSC.
  • the PDSN 330 is connected to the BSC to provide a packet data service to subscribers.
  • the DCN 340 supports connection between the PDSN 330 and the IP network 70.
  • the mobile switching centers 220 and 320 of the asynchronous mobile communication system 20 and the synchronous mobile communication system 30 are interconnected through an Interworking Interoperability Function (IIF) unit 60.
  • the HF unit 60 receives an asynchronous message from the asynchronous mobile switching center 220, converts the received asynchronous message to a synchronous message, and then transmits the converted synchronous message to the synchronous mobile switching center 320.
  • the IIF unit 60 constructs and manages a database for the synchronous mobile communication system information.
  • the asynchronous mobile switching center 220 and the synchronous mobile switching center 320 are interconnected through a No. 7 common signal network 40 and are connected to a Dual stack Home Location Register (D-HLR) 50 through the No. 7 common signal network 40.
  • the Dual stack Home Location Register 50 stores and manages asynchronous mobile communication system subscriber information of the DBDM mobile communication terminal 10 and corresponding synchronous mobile communication system subscriber information, so that the asynchronous mobile switching center 220 and the synchronous mobile switching center 320 can refer to the information when performing works such as handover.
  • the first embodiment of the present invention relates to a method for handover of a mobile communication terminal during a voice communication in a hybrid mobile communication system including both an asynchronous network and a synchronous network.
  • the mobile communication terminal 10 performing voice communication within the area of the asynchronous mobile communication system 20 periodically measures the intensity of the signal from a serving node B to which the mobile communication terminal 10 is currently connected and the intensity of the signal from neighbor node Bs adjacent to the serving node B and reports the measured intensities to the serving node B.
  • the node B/RNC 210 transmits to the asynchronous mobile switching center 220 the report together with information of neighbor cells, base station IDs, etc., which have been detected by the mobile communication terminal 10.
  • the asynchronous mobile switching center 220 Upon receiving a handover request message from the RNC, the asynchronous mobile switching center 220 determines with reference to the neighbor cells, base station IDs, etc., received from the RNC if the requested handover is handover between neighbor cells within the asynchronous mobile communication system 20 or handover to the synchronous mobile communication system 30.
  • the asynchronous mobile switching center 220 When the requested handover is handover between neighbor cells within the asynchronous mobile communication system 20, the asynchronous mobile switching center 220 performs the handover between neighbor cells. In contrast, when the requested handover is handover to the synchronous mobile communication system 30, the asynchronous mobile switching center 220 causes the IIF unit 60 to perform the handover to the synchronous mobile communication system 30. For the handover, the IIF unit 60 converts an asynchronous message to a synchronous message and transmits the converted synchronous message to the synchronous mobile switching center 320. For this operation, it is necessary for the IIF unit 60 to construct and manage a database of the synchronous mobile communication system information in advance. The database includes information of switching centers, signal point, information of the trunk line in relation to a dedicated channel, etc.
  • the HF unit 60 Based on the synchronous mobile communication system information and the handover request from the asynchronous mobile switching center 220, the HF unit 60 selects the target to be handovered, that is, the mobile switching center 220, and generates a billing ID including an ID of the handover target mobile switching center, which can be used in the handover process thereafter.
  • FTG. 2 is a block diagram for illustrating the concept of the handover when a mobile communication terminal performing voice communication in an asynchronous mobile communication system area moves to a synchronous mobile communication system area
  • FTG. 3 is a flowchart of a process for the handover of the mobile communication terminal in voice communication.
  • the mobile communication terminal 10 As the mobile communication terminal 10 performing voice communication in the area of the asynchronous mobile communication system 20 moves to the area of the synchronous mobile communication system 30, the mobile communication terminal 10 detects a signal from the synchronous mobile communication system 30, periodically measures the intensities of the signals from a current serving node B of the asynchronous mobile communication system 20 and neighbor base stations (node Bs), and reports the measured intensities to the current serving node B. When the intensity of the signal from the current serving node B to which the mobile communication terminal 10 currently connects is lower than a predetermined value, the mobile communication terminal 10 transmits a handover request message (IU- Reloc Required) to the asynchronous mobile switching center 220 through the RNC (step S101).
  • IU- Reloc Required handover request message
  • This handover request message (IU Reloc Required) includes a handover-related message used in the synchronous mobile communication system.
  • the RNC transmits to the asynchronous mobile switching center 220, together with the handover request message, neighbor cell information, neighbor base station information (neighbor BS IDs), etc., which have been received from the mobile communication terminal 10. Based on this information, the asynchronous mobile switching center 220 determines if the requested handover is handover between neighbor cells within the asynchronous mobile communication system 20 or handover to the synchronous mobile communication system 30.
  • the handover request message (IU Reloc Required) transmitted from the RNC to the asynchronous mobile switching center 220 includes parameters such as message type, handover type, handover cause, source base station controller ID, target base station controller ID, Radio Access Bearer (RAB) information and wireless zone-related information, as shown in FTG. 4. Further, the RNC adds the handover-related information used in the synchronous mobile communication system to the parameter of 'Old BSS To New BSS Information' included in the handover request message. ?FTG. 5 shows a list of the added handover-related information in detail.
  • the asynchronous mobile switching center 220 Upon receiving the handover request message, the asynchronous mobile switching center 220 transmits an asynchronous message (?MAP Prep Handover Req) requesting handover to the IIF unit 60 (step S102).
  • an extension container is added to the asynchronous message, which is then transmitted together with an asynchronous identifier (MSISDN) of the mobile communication terminal 10.
  • the asynchronous message includes parameters such as an invoke ID, a target cell ID, a target radio network controller ID, and an MSISDN, as shown in FTG. 6.
  • the IIF unit 60 requests the D-HLR 50 to transmit subscriber information (Call Data Request) (step S103). That is, the IIF unit 60 requests a synchronous network identifier (MIN, ESN) of the mobile communication terminal 10.
  • the HF unit 60 may request synchronous network identifier information of a subscriber to the D-HLR 50 by using an asynchronous message (MAP_SEND_IMSI).
  • the D-HLR 50 Upon receiving the request for the subscriber information, the D-HLR 50 refers to the database, extracts synchronous network identifier information (MIN, ESN) of the corresponding subscriber, and then transmits the extracted information to the IIF unit 60 (Call Data Req Ack) (step SI 04).
  • the synchronous network message (Call Data Request) requesting the synchronous network identifier information of the subscriber includes parameters such as the billing ID and digits (i.e. MSISDN) as shown in FTG. 7, and the response message (Call Data Req Ack) includes parameters such as ESN, MIN, and MSCID.
  • the asynchronous message ?MAP_SEND_IMSI
  • the asynchronous message includes parameters as shown in FTG. 8.
  • the IIF 60 Upon receiving the subscriber information from the D-HLR 50, the IIF 60 instructs (Facilities Directive2) the handover to the synchronous mobile switching center 320 (step S105), and the synchronous mobile switching center 320 sends a handover request message (Handoff Request) to the BTS/BSC 310 (step S106).
  • Facilities Directive2 the handover to the synchronous mobile switching center 320
  • Handoff Request handover request message
  • the IIF unit 60 Before transmitting the handover instruction message (Facilities Directive2) to the synchronous mobile switching center 320, the IIF unit 60 produces a billing identifier (ID) and inserts it in the handover instruction message (Facilities Directive2). Also, the IIF unit 60 inserts the internal switching center circuit ID (InterMSCCircuitlD) into the transmitted handover instruction message (Facilities Directive2).
  • the billing ID includes an ID of the synchronous mobile switching center 320 to which the asynchronous mobile switching center 220 will connect.
  • the BTS/BSC 310 Upon receiving the handover request message from the synchronous mobile switching center 320, the BTS/BSC 310 transmits null frames (Forward Traffic Channel frames) through a downlink traffic channel to the synchronous modem of the mobile communication terminal 10, thereby enabling assignment of a downlink channel (step S107). Then, the BTS/BSC 310 transmits to the synchronous mobile switching center 320 a response message (Handoff Request Ack) in response to the handover request message from the synchronous mobile switching center 320 (step S108). Then, the synchronous mobile switching center 320 transmits to the asynchronous mobile switching center 220 a response message (Facilities Directive2 Ack) in response to the handover instruction message of step S102 (step S109). As a result, a trunk line between the asynchronous mobile switching center 220 and the synchronous mobile switching center 320 is established.
  • null frames Forward Traffic Channel frames
  • the IIF unit 60 sets a mapping relation between a physical trunk line and a dedicated channel which is an identifier for logical trunk line establishment, sets this information as the internal switching center circuit ID (InterMSCCircuitlD) of the handover instruction message (Facilities Directive2), and transmits the set ID to the synchronous mobile switching center 320. Thereafter, when the response message (Facilities Directive2 Ack) has been transmitted from the synchronous mobile switching center 320, the trunk line between the asynchronous mobile switching center 220 and the synchronous mobile switching center 320 is established.
  • InterMSCCircuitlD the internal switching center circuit ID
  • Facilities Directive2 Ack the response message
  • the handover instruction message (Facilities Directive2) transmitted between the IIF unit 60 and the synchronous mobile switching center 320 includes parameters such as a billing ID, an ESN, an internal switching center circuit ID and MIN, as shown in FTG. 9, and the response message (Facilities Directive2 Ack) thereof includes parameters such as CD?MA channel data and a CD?MA channel list.
  • the asynchronous mobile switching center 220 transmits an Initial Address Message (IAM) to the IIF unit 60, and the IIF unit 60 transmits an Address Completion Message (ACM) in response to the IAM, so that the trunk line is set between the asynchronous mobile switching center 220 and the synchronous mobile switching center 320 and the call can be routed through the trunk line (step Sill and SI 12).
  • IAM Initial Address Message
  • ACM Address Completion Message
  • Messages for the trunk setting between the mobile switching centers are transmitted received by the ISUP.
  • the asynchronous mobile switching center 220 reports to the node B/RNC 210 that resource allocation for the handover has been completed (IU Relocation Command) (step SI 13).
  • the node B/RNC 210 requests the asynchronous modem of the mobile communication terminal 10 to perform handover (Handover from UTRAN command) (step SI 14).
  • the message (IU Relocation Command) reporting that resource allocation for the handover has been completed includes parameters including the message type, the RRC container, the RAB list to be released, etc. as shown in FTG. 10.
  • a handover message (HDM) is transmitted using an L3 parameter of the resource allocation completion report message. ?FTG. 11 shows a list of specific parameters in the handover message.
  • the asynchronous modem of the mobile communication terminal 10 transmits channel assignment information to the synchronous modem (step SI 15) and the IIF unit 60 requests an access signal (?MAP Process Access Signaling Req) to the asynchronous mobile switching center 220 (step SI 16).
  • the access signal contains an invoke ID, an Application Protocol Data Unit (APDU), selected radio resource information, etc. ?FTG. 12 shows a list of specific parameters in the access signal.
  • APDU Application Protocol Data Unit
  • the synchronous modem of the mobile communication terminal 10 transmits frames or preambles through an uplink traffic channel to the BTS/BSC 310 of the synchronous mobile communication system (step SI 17) and reports (Handoff Completion Message) that the handover has been completed (step SI 18).
  • the BTS/BSC 310 Upon receiving the report (Handoff Completion Message), the BTS/BSC 310 transmits a response signal (BS Ack Order) in response to the report (step SI 19).
  • the synchronous modem reports to the asynchronous modem that the call connection with the synchronous mobile communication system has been completely established (step S120).
  • the BTS/BSC 310 reports to the synchronous mobile switching center 320 (Handoff Complete) that the handover has been completed (step S121), and the synchronous mobile switching center 320 reports to the IIF unit 60 (Mobile On Channel) that the handover has been completed (step SI 22).
  • the IIF unit 60 requests the asynchronous mobile switching center 220 to release the connection (MAP Send End Signal Req) (step S123).
  • the HF unit 60 transmits to the asynchronous mobile switching center 220 a message (ANSWER) reporting the connection between the mobile communication terminal and the synchronous mobile switching center 320 (step S124). Then, the connection between the asynchronous mobile switching center 220 and the node B/ RNC 210 is released (IU Release Command, IU Release Complete) (steps 125 and 126).
  • ANSWER a message reporting the connection between the mobile communication terminal and the synchronous mobile switching center 320
  • the connection between the asynchronous mobile switching center 220 and the node B/ RNC 210 is released (IU Release Command, IU Release Complete) (steps 125 and 126).
  • the hand over completion message (Mobile On Channel) transmitted from the mobile switching center 320 to the HF unit 60 includes parameters as shown in FTG. 13
  • the connection release request message (MAP Send End Signal Req) transmitted from the IIF unit 60 to the asynchronous mobile switching center 220 includes parameters as shown in FTG. 14.
  • the messages (IU Release Command, IU Release Complete) transmitted for release of connection between the node B/RNC and the asynchronous mobile switching center 220 includes parameters as shown in FTGs. 15 and 16.
  • a process of releasing the call connection after the handover of the mobile communication terminal performing voice communication in the area of the asynchronous mobile communication system into the synchronous mobile communication system has been completed according to the process described above will be briefly discussed below.
  • the release of the call connection may be first requested by either a mobile communication terminal of a subscriber still located within the area of the asynchronous mobile communication system or a mobile communication terminal of a subscriber already handovered to the area of the synchronous mobile communication system.
  • description is given of the case where the release of the call connection has been requested by the mobile communication terminal of the subscriber still located within the area of the asynchronous mobile communication system.
  • the call connection between the asynchronous mobile switching center 220 and the synchronous mobile switching center 320 is released (Call Release) (step SI 27) and the trunk connection between the mobile switching centers is released (Release) (step S128).
  • the asynchronous mobile switching center 220 reports to the IIF unit 60 that the release of the connection has been completed (MAP Send End Signal Resp) (step SI 29), and the IIF unit 60 transmits a call release request message (Facilities Release) to the synchronous mobile switching center 320 (step SI 30).
  • the synchronous mobile switching center 320 sends a response (Facilities Ack) to the request message
  • the trunk line set between the mobile switching centers is released (step S131).
  • the call release request message includes, as shown in FTG. 17, parameters including an internal MSC circuit ID, a release reason, a billing ID, MIN, etc.
  • the response message includes parameters including a billing ID, etc.
  • the asynchronous mobile switching center determines if the requested handover is handover between neighbor cells within the asynchronous mobile communication system or handover to the synchronous mobile communication system.
  • handover is performed in such a manner that messages are exchanged between the synchronous mobile switching center and the asynchronous mobile switching center by using an ISUP (a protocol for message transmission between mobile switching centers) while the HF unit functions as a converter.
  • ISUP a protocol for message transmission between mobile switching centers
  • the second embodiment of the present invention relates to a method for handover of a mobile communication terminal in a state of waiting for a response to a call in a hybrid mobile communication system including both an asynchronous network and a synchronous network.
  • FTG. 18 is a block diagram for illustrating the concept of the handover of a call- originating mobile communication terminal waiting for a response to the originated call between an asynchronous network and a synchronous network according to the second embodiment of the present invention, in which the mobile communication terminals include a call-originating mobile communication terminal 10a and a call- terminating mobile communication terminal 10b.
  • the call-terminating mobile communication terminal 10b When the call-terminating mobile communication terminal 10b is in a state of call- termination alert by the node B/RNC 210 according to the call origination by the call- originating mobile communication terminal 10a and the call-originating mobile communication terminal 10a moves into the overlap area C between the synchronous and asynchronous mobile communication systems or the area B of the synchronous mobile communication system, the call-originating mobile communication terminal 10a requests handover to the node B of the asynchronous mobile communication system 20, and then the node B requests handover through the RNC to the asynchronous mobile switching center 220.
  • the handover of the call-originating mobile communication terminal 10a between the asynchronous mobile communication system 20 and the synchronous mobile communication system 30 is started.
  • the call-originating mobile communication terminal 10a connects with the synchronous mobile communication system 30 through the BTS/BSC 310 and waits for a response from the call-terminating mobile communication terminal 10b.
  • the mobile communication terminal 10a For the handover of a mobile communication terminal in a state of waiting for a response to a call, the mobile communication terminal 10a periodically measures the intensity of the signal from a serving node B to which the mobile communication terminal 10 is currently connected and the intensity of the signal from neighbor node Bs adjacent to the serving node B and reports the measured intensities to the serving node B.
  • the node B/RNC 210 transmits to the asynchronous mobile switching center 220 the report together with information of neighbor cells, base station IDs, etc., which have been detected by the mobile communication terminal 10a.
  • the asynchronous mobile switching center 220 Upon receiving a handover request message from the RNC, the asynchronous mobile switching center 220 determines with reference to the neighbor cells, base station IDs, etc., received from the RNC if the requested handover is handover between neighbor cells within the asynchronous mobile communication system 20 or handover to the synchronous mobile communication system 30.
  • the asynchronous mobile switching center 220 When the requested handover is handover between neighbor cells within the asynchronous mobile communication system 20, the asynchronous mobile switching center 220 performs the handover between neighbor cells. In contrast, when the requested handover is handover to the synchronous mobile communication system 30, the asynchronous mobile switching center 220 causes the IIF unit 60 to perform the handover to the synchronous mobile communication system 30. For the handover, the IIF unit 60 converts an asynchronous message to a synchronous message and transmits the converted synchronous message to the synchronous mobile switching center 320. For this operation, it is necessary for the IIF unit 60 to construct and manage a database of the synchronous mobile communication system information in advance. The database includes information of switching centers, signal point, information of the trunk line in relation to a dedicated channel, etc.
  • the HF unit 60 Based on the synchronous mobile communication system information and the handover request from the asynchronous mobile switching center 220, the HF unit 60 selects the target to be handovered, that is, the mobile switching center 220, and generates a billing ID including an ID of the handover target mobile switching center, which can be used in the handover process thereafter. Further, the HF unit 60 sets a trunk between the asynchronous mobile switching center 220 and the synchronous mobile switching center 320, so that the asynchronous mobile switching center 220 and the synchronous mobile switching center 320 can exchange messages by using an ISUP which is a message transmission protocol between mobile switching centers.
  • ISUP is a message transmission protocol between mobile switching centers.
  • FTGs. 19 and 20 illustrate a flowchart of the process for the handover of the mobile communication terminal in a state of waiting for a call response from the asynchronous network to the synchronous network according to the second embodiment of the present invention.
  • the asynchronous modem and the synchronous modem shown in FTGs. 19 and 20 are modems of the call-originating mobile communication terminal 10a.
  • the mobile communication terminal 10a As the mobile communication terminal 10a located in the area of the asynchronous mobile communication system 20 moves toward the area of the synchronous mobile communication system 30 after originating a call to the mobile communication terminal 10b also located in the area of the asynchronous mobile communication system 20 and is then located within the overlap area C between the asynchronous mobile communication system area and the synchronous mobile communication system area, the mobile communication terminal 10a detects a signal from the synchronous mobile communication system 30, periodically measures the intensities of the signals from a current serving node B of the asynchronous mobile communication system 20 and neighbor base stations (node Bs), and reports the measured intensities to the current serving node B.
  • node Bs neighbor base stations
  • the mobile communication terminal 10a When the intensity of the signal from the current serving node B to which the mobile communication terminal 10a currently connects is lower than a predetermined value, the mobile communication terminal 10a transmits a handover request message (TU- Reloc Required) to the asynchronous mobile switching center 220 through the RNC (step S201).
  • TU- Reloc Required a handover request message
  • step S201 ⁇ S226 in FTGs. 19 and 20 A successive process in which the handover is performed in response to the handover request and connection is then released according to a request for release of the connection are in fact the same as those (steps SlOl ⁇ S126 in FTG. 3) according to the first embodiment of the present invention, so a detailed description thereof is omitted here.
  • MAP Prep Handover Req asynchronous message
  • MSISDN asynchronous identifier
  • the status of the mobile communication terminal 10a must be expressed by using the parameters included in the handover request message (?MAP Prep Handover Req).
  • This message includes parameters such as an invoke ID, a target cell ID, a target radio network controller ID, and an MSISDN, as shown in FIG. 6.
  • the handover instruction message (Facilities Directive2) transmitted between the IIF unit 60 and the synchronous mobile switching center 320 includes parameters such as a billing ID, an ESN, an internal switching center circuit ID, MIN, and handoff status, as shown in FTG. 9. Especially, the parameter Handoff status is an identifier representing that the mobile communication terminal is in the state of waiting a response. Also, the response message (Facilities Directive2 Ack) thereof includes parameters such as CDMA channel data and a CD?MA channel list.
  • the call is established between the call- terminating mobile communication terminal in the asynchronous mobile communication system area, the asynchronous mobile switching center, the IIF unit, the synchronous mobile switching center, and the call-originating mobile communication terminal.
  • the node B/RNC connected to the call-terminating mobile communication terminal 10b reports it to the asynchronous mobile switching center 220 (BICC or ISUP ANSWER) (step S227), and the asynchronous mobile switching center 220 transmits a downlink access signal to the IIF unit 60 (MAP Forward Access Signaling Req) (step S228).
  • BICC or ISUP ANSWER asynchronous mobile switching center 220
  • the IIF unit 60 recognizes the response from the call-terminating mobile communication terminal 10b and transmits an intersystem response message (Intersystem Answer) to the synchronous mobile switching center 320 (step S229). Thereafter, the synchronous mobile switching center 320 reports the response of the call-terminating mobile communication terminal 10b to the BTS/BSC 310 (Progress) (step S230), and transmits to the IIF unit 60 a response message (Intersystem Answer Ack) responding to the intersystem response message (S231).
  • Intersystem Answer Intersystem Answer
  • the intersystem response message includes parameters as shown in FTG. 21, which include internal MSC circuit ID, MIN, ESN, etc.
  • the RNC requests handover to the asynchronous mobile switching center and the asynchronous mobile switching center determines if the requested handover is handover between neighbor cells within the asynchronous mobile communication system or handover to the synchronous mobile communication system.
  • handover is performed in such a manner that messages are exchanged between the synchronous mobile switching center and the asynchronous mobile switching center by using an ISUP (a protocol message transmission between mobile switching centers) while the IIF unit functions as a converter. Then, the fact that the mobile communication terminal to be handovered is in the state of waiting for a response is reported.
  • ISUP a protocol message transmission between mobile switching centers
  • the asynchronous mobile switching center reports to the IIF unit that the call-terminating mobile communication terminal has responded. Then, the IIF unit transmits an intersystem response message to the asynchronous mobile switching center, thereby reporting that the call-terminating mobile communication terminal has responded to the alerting. Then, the handover is completed.
  • the third embodiment of the present invention relates to a method for handover of a mobile communication terminal in an alert state for call termination in a hybrid mobile communication system including both an asynchronous network and a synchronous network.
  • FTG. 22 is a block diagram for illustrating the concept of the handover of a mobile communication terminal in an alert state for call termination between an asynchronous network and a synchronous network according to the third embodiment of the present invention, in which the mobile communication terminals include a call-originating mobile communication terminal 10a and a call-terminating mobile communication terminal 10b.
  • the handover of the call-terminating mobile communication terminal 10b between the asynchronous mobile communication system 20 and the synchronous mobile communication system 30 is started.
  • the asynchronous mobile switching center 220 and the synchronous mobile switching center 320 are interconnected through the IIF unit 60, the call origination alert by the call-originating mobile communication terminal 10a is transmitted through the BTS/ BSC 310 of the synchronous mobile communication system 30 to the call-terminating mobile communication terminal 10b.
  • the mobile communication terminal 10b For the handover of a mobile communication terminal in such an alert state for call termination, the mobile communication terminal 10b periodically measures the intensity of the signal from a serving node B to which the mobile communication terminal 10b is currently connected and the intensity of the signal from neighbor node Bs adjacent to the serving node B and reports the measured intensities to the serving node B.
  • the node B/RNC 210 transmits to the asynchronous mobile switching center 220 the report together with information of neighbor cells, base station IDs, etc., which have been detected by the mobile communication terminal 10a.
  • the asynchronous mobile switching center 220 Upon receiving a handover request message from the RNC, the asynchronous mobile switching center 220 determines with reference to the neighbor cells, base station IDs, etc., received from the RNC if the requested handover is handover between neighbor cells within the asynchronous mobile communication system 20 or handover to the synchronous mobile communication system 30.
  • the asynchronous mobile switching center 220 performs the handover between neighbor cells.
  • the asynchronous mobile switching center 220 causes the IIF unit 60 to perform the handover to the synchronous mobile communication system 30.
  • the IIF unit 60 converts an asynchronous message to a synchronous message and transmits the converted synchronous message to the synchronous mobile switching center 320.
  • the database includes information of switching centers, signal point, information of the trunk line in relation to a dedicated channel, etc.
  • the HF unit 60 Based on the synchronous mobile communication system information and the handover request from the asynchronous mobile switching center 220, the HF unit 60 selects the target to be handovered, that is, the mobile switching center 220, and generates a billing ID including an ID of the handover target mobile switching center, which can be used in the handover process thereafter. Further, the HF unit 60 sets a trunk between the asynchronous mobile switching center 220 and the synchronous mobile switching center 320, so that the asynchronous mobile switching center 220 and the synchronous mobile switching center 320 can exchange messages by using an ISUP which is a message transmission protocol between mobile switching centers.
  • ISUP is a message transmission protocol between mobile switching centers.
  • FTGs. 23 and 24 illustrate a flowchart of the process for the handover of the mobile communication terminal in an alert state for call termination from the asynchronous network to the synchronous network according to the third embodiment of the present invention.
  • the asynchronous modem and the synchronous modem shown in FTGs. 23 and 24 are modems of the call-terminating mobile communication terminal 10b.
  • the mobile communication terminal 10b detects a signal from the synchronous mobile communication system 30, periodically measures the intensities of the signals from a cu ⁇ ent serving node B of the asynchronous mobile communication system 20 and neighbor base stations (node Bs), and reports the measured intensities to the cu ⁇ ent serving node B.
  • the mobile communication terminal 10b When the intensity of the signal from the cu ⁇ ent serving node B to which the mobile communication terminal 10b cu ⁇ ently connects is lower than a predetermined value, the mobile communication terminal 10b transmits a handover request message (IU- Reloc Required) to the asynchronous mobile switching center 220 through the RNC (step S301).
  • IU- Reloc Required a handover request message
  • step S301 ⁇ S326 in FTGs. 23 and 24 A successive process in which the handover is performed in response to the handover request and connection is then released according to a request for release of the connection are in fact the same as those (steps SlOl ⁇ S126 in FTG. 3) according to the first embodiment of the present invention, so a detailed description thereof is omitted here.
  • asynchronous mobile switching center 220 transmits an asynchronous message (MAP Prep Handover Req) requesting handover to the IIF unit 60 in response to the received handover request message (step S302)
  • an extension container is added to the asynchronous message, which is then transmitted together with an asynchronous identifier (MSISDN) of the mobile communication terminal 10b and a report that the mobile communication terminal 10b is in an alert state for call termination.
  • MSISDN asynchronous identifier
  • the status of the mobile communication terminal 10b must be expressed by using the parameters included in the handover request message (?MAP Prep Handover Req).
  • This message (?MAP Prep Handover Req) includes parameters such as an invoke ID, a target cell ID, a target radio network controller ID, and an MSISDN, as shown in FTG. 6.
  • the handover instruction message (Facilities Directive2) transmitted between the IIF unit 60 and the synchronous mobile switching center 320 includes parameters such as a billing ID, an ESN, an internal switching center circuit ID, MIN, and handoff status, as shown in FTG. 9. Especially, the parameter Handoff status is an identifier representing that the mobile communication terminal is in the alert state for call termination. Also, the response message (Facilities Directive2 Ack) thereof includes parameters such as CD?MA channel data and a CDMA channel list.
  • the call is established between the call-originating mobile communication terminal in the asynchronous mobile communication system area, the asynchronous mobile switching center, the IIF unit, the synchronous mobile switching center, and the call-terminating mobile communication terminal.
  • the BTS/BSC 310 reports it to the synchronous mobile switching center 320 (Connect) (step S327), and the synchronous mobile switching center 320 transmits an intersystem response message (Intersystem Answer) to the IIF unit 60, thereby reporting that the call-terminating mobile communication terminal 10b has responded (step S328).
  • the HF unit 60 transmits an access signal (MAP Forward Access Signaling Req) to the asynchronous mobile switching center 220, thereby reporting the response from the call-terminating mobile communication terminal 10b (step S329).
  • the IIF unit 60 transmits to the the synchronous mobile switching center 320 a response message (Intersystem Answer Ack) responding to the intersystem response message (S330).
  • the intersystem response message includes parameters as shown in FTG. 21, which include internal MSC circuit ID, MIN, ESN, etc.
  • the RNC requests handover to the asynchronous mobile switching center and the asynchronous mobile switching center determines if the requested handover is handover between neighbor cells within the asynchronous mobile communication system or handover to the synchronous mobile communication system.
  • handover is performed in such a manner that messages are exchanged between the synchronous mobile switching center and the asynchronous mobile switching center by using an ISUP (a protocol message transmission between mobile switching centers) while the IIF unit functions as a converter. Then, the fact that the mobile communication terminal to be handovered is in the alert state for call termination is reported.
  • ISUP a protocol message transmission between mobile switching centers
  • the asynchronous mobile switching center reports to the IIF unit that the call-terminating mobile communication terminal has responded. Then, the IIF unit transmits an intersystem response message to the asynchronous mobile switching center, thereby reporting that the call-terminating mobile communication terminal has responded to the alerting. Then, the handover is completed.
  • the handover is performed by using an Interworking Interoperability Function (HF) unit for signal exchange between asynchronous and synchronous mobile switching centers and an ISUP (a protocol for message transmission between mobile switching centers). Therefore, the present invention can provide a high quality service regardless of the generation of the mobile communication system.
  • HF Interworking Interoperability Function
  • the present invention eliminates prevents construction of the asynchronous mobile communication system over an unnecessarily wide area and thus can reduce the investment necessary for design of the asynchronous mobile communication system.

Abstract

L'invention concerne un procédé permettant de transférer un terminal de communication mobile à l'aide d'une unité de fonction d'interopérabilité et d'interfonctionnement (IIF) afin d'échanger un signal entre des centres de commutation mobiles asynchrones et synchrones et un protocole (ISUP) et de transmettre un message entre lesdits centres de commutation mobiles dans un système de communication mobile hybride comprenant à la fois un réseau asynchrone et un réseau synchrone.
PCT/KR2005/000682 2004-03-10 2005-03-10 Procede de transfert de terminal de communication mobile dans un reseau de communications mobile hybride de reseau de communications asynchrone et synchrone WO2005086385A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BRPI0508151-3A BRPI0508151A (pt) 2004-03-10 2005-03-10 método para o handover de um terminal de comunicação móvel de banda dupla e modo duplo em um sistema hìbrido de comunicação móvel incluindo tanto um sistema de comunicação móvel assìncrono e um sistema de comunicação móvel sìncrono
JP2007502721A JP4657286B2 (ja) 2004-03-10 2005-03-10 非同期網と同期網が混在する移動通信システムにおける移動通信端末のハンドオーバー方法

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KR1020040016287A KR100612677B1 (ko) 2004-03-10 2004-03-10 비동기망과 동기망이 혼재된 이동통신 시스템에서음성통화중 이동통신 단말의 핸드오버 방법
KR1020040016290A KR100625658B1 (ko) 2004-03-10 2004-03-10 비동기망과 동기망이 혼재된 이동통신 시스템에서 발신이동통신 단말의 응답 대기 중 핸드오버 방법
KR10-2004-0016287 2004-03-10
KR1020040016291A KR100612678B1 (ko) 2004-03-10 2004-03-10 비동기망과 동기망이 혼재된 이동통신 시스템에서이동통신 단말의 착신 얼러팅 중 핸드오버 방법
KR10-2004-0016290 2004-03-10
KR10-2004-0016291 2004-03-10

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