KR19990061172A - Call Transfer Control Method in Personal Communication Switching System - Google Patents

Abstract

The present invention relates to a call transfer control method in a personal communication switching system, wherein a calling party's mobile subscriber transfers a plurality of called party's mobile subscribers and calls them so that they can be connected to each other. It is possible to reduce the inconvenience of having to call a plurality of base station controllers that are responsible for the call setup of the radio for a plurality of mobile subscriber station; A plurality of matching exchange subsystems (ASS-W) including a T-switch for setting up a call to a corresponding subscriber station while managing the plurality of base station controllers, a switching network control (SNC) and a space switch (SSW); A personal communication exchange system comprising a network control subsystem (INS) including an LCC and a personal communication switch having an ASS-T for access to an HLR, the second subscriber serving as a calling party subscriber among the plurality of subscriber stations. The first subscriber terminal as the terminal and the called party subscriber makes a call between the second subscriber terminal and the third subscriber terminal while the first subscriber terminal calls the third subscriber terminal of the call transfer target during the call. It features.

Description

Call Transfer Control Method in Personal Communication Switching System

The present invention relates to a call transfer control method in a personal communication exchange system, and more particularly, a calling party's mobile subscriber station interconnects a plurality of called party's mobile subscriber stations, or after a call with one called party. The present invention relates to a call transfer control method in a personal communication switching system for performing a call transfer so as to be interconnected by calling a side mobile subscriber station.

Recently, in the exchange where a plurality of terminals are connected through a wired subscriber line, the call is possible only by the subscriber terminal connected through the subscriber line. There is a proposed mobile subscriber station that can set up calls and handle calls without being restricted by regional or local restrictions.

In order to realize personal communication by such subscriber terminal, it is a wired / wireless integrated system in which the wireless subscriber processing function is added in addition to the existing service processing function for wired subscribers, and provides various services guaranteed in the personal communication network. In order to provide various communication services provided in the network, a personal communication exchange has been proposed and applied in practical use to provide interworking functions with other networks (ISDN, PLDN, etc.) that are heterogeneous with the personal communication network. .

1 is a schematic block diagram of a general personal communication system.

In the figure, reference numeral 10 denotes a subscriber station of mobility referred to as a so-called 'mobile phone' which a personal communication subscriber can carry, and reference numerals 20a to 20n transmit / receive call processing data between the subscriber station and the subscriber station 10; A base station that receives and transmits / receives a radio signal to the subscriber station 10, converts a communication protocol, encrypts / decrypts, and the like.

In addition, 30a to 30n indicate a base station controller which performs a function related to allocation control of a communication channel to the subscriber station 10 and determination of handover while managing a plurality of base stations.

In addition, 40 denotes a personal communication switch interfaced with the base station controllers 30a-30n; 30 in accordance with IS-651 / IS-634 standards, and 50 denotes a subscriber information management device (Home) described below for each subscriber station 10. It represents an authentication center that is matched with a location register (HLR) and performs an authorization process for an arbitrary subscriber station 10 or the like.

In addition, reference numeral 60 denotes a personal communication switch of another station for mutual communication of communication information by being interconnected with the personal communication switch 40 through a trunk medium.

2 is a view for explaining a schematic configuration of the personal communication switch 40 shown in FIG. 1, in which 72a to 72n correspond to the base station controllers 30a to 30n to perform wireless mobile communication. An access switching subsystem for wireless subscriber (ASS-W) for executing the call processing function of the subscriber station (10). Here, the ASS-W (72a-72n) has a systemic horizontal structure so that it can be expanded in units of ASS-W if necessary, while performing the call processing function or self-operation maintenance function for most mobile communication. Will have

In FIG. 2, 74 indicates a conventional wired analog subscriber terminal, and 76 indicates an access switching subsystem for subscriber (ASS-) for executing a call processing function of the wired analog subscriber terminal 74. FIG. S), the ASS-S (76) can also be expanded in units of the ASS-S if necessary, while performing most of the call processing function for the wired subscriber terminal 74 or its own operation maintenance function. In order to have a systemic horizontal structure.

In FIG. 2, reference numeral 78 denotes the overall call processing of the corresponding personal communication switch 40 through the data link (ie, the optical link) for the ASS-W 72 (72a-72n) and the ASS-S 76. / Interconnection network subsystem (INS) responsible for administrative control, the INS (78) is the ASS-W / ASS-S (72, 76) for the configuration of the switching network (TST) In addition to the space switch (Space switch) associated with the time switch (T) located in the store, the storage and management of information about the subscriber station 10 existing in the service area of the corresponding personal communication switch 40 The VLR (Visitor Location Register) is located for the mobility management function. Here, the VLR temporarily stores the entire information about subscriber terminals 10, --- existing in the area managed by the corresponding personal communication switch 40, and the information is called by the personal communication subscriber. In the case of setting the, the personal communication switch 40 is transmitted to the personal communication switch 40 in response to a request of the personal communication switch 40, and the information in the VLR is continuously modified as the subscriber terminal 10 moves.

In FIG. 2, reference numeral 80 denotes an access switching subsystem for trunk (ASS-T), and the ASS-T (80) performs relay line matching with a personal communication switch (60) of the other station. In addition, a public switched data network (PSDNN) and a comprehensive information and communication network for the unification of exchange / transmission / subscriber terminals on the premise of digital technology to provide telephone / telephony and various non-system-based services. Integrated service digital network (ISDN), which has at least one in a personal communication network, functions as a database management system that stores and manages subscriber parameters and location information for all terminals registered in its PCN, while providing access to subscriber terminals. Important data including basic services and supplementary services are registered and the routing function of the called party is performed. It is connected to the (Home location register) HLR.

In addition, 84 in FIG. 2 is a signal control (Work station) connected to the INS 78 (Central control system) consisting of a processor and peripheral devices for performing the overall operation management and maintenance functions of the corresponding exchange (Central Control System) For the CCS 78, a CAMA (Centralized authomatic message) that collects and processes billing data transmitted from the switch 40 while interworking with the corresponding exchange 40 according to the connection standard between the personal communication switch / billing center. OMC (Operation and maintenance) which performs the centralized operation / maintenance function for all the components constituting the personal communication network while interworking with the TMN Q interface to the exchange 40 with the accounting; center and a network management center (NMC) 88 for management of a personal communication network.

In the case of the call signal processing procedure from the subscriber station 10 during the call setup procedure for the personal mobile communication executed by the personal communication exchange system having such a configuration, the subscriber station 10 corresponds to the corresponding base station ( For example, a message for requesting a layer 2 response message is transmitted to the base station controller 30a that manages the base station 20a through 20a, and the base station controller 30a side responds to the message. In addition to transmitting a base station acknowledge order to the subscriber station 10, a corresponding service request message (CM service request) is included in the COMPLETE LAYER 3 to the corresponding personal communication switch 40 and transmitted.

Accordingly, the personal communication switch 40 executes the authentication procedure by the authentication center 50 when the authentication procedure is assumed in response to the service request message, and the authentication procedure is supported by the authentication center 50. When performed, the personal communication switch 40 performs signal channel connection establishment using an SCCP primitive. In this case, the switch 40 transmits a message (SCCP connection confirmed) to the base station controller 30a. .

Subsequently, when the message connection is confirmed, the base station controller 30a transmits a setup (SET-UP) message to the personal communication switch 40 to provide information for setting up a call. When receiving a message, the personal communication switch 40 transmits a message (call proceeding) to the base station controller 30a to initiate a call setup procedure at the network side and rejects the reception of additional call setup information. You will be notified.

Then, the personal communication switch 40 transmits an assignment request for requesting radio resource allocation (traffic channel) to the base station controller 30a, and the base station that receives the message (Assignment request). The controller 30a connects a perfect audio path to the wired line and transmits a channel assignment message to the terminal 10 to set up a wireless traffic channel. Will be sent through.

Accordingly, the subscriber station 10 transmits a message (Traffic channel preamble) through the designated reverse traffic channel, and when the base station controller 30a recognizes the reverse traffic channel through the base station 20a, the base station controller 30a transmits a message (base station acknowledge order) for requesting a layer 2 response message to the subscriber station 10 through a forward traffic channel.

When the subscriber station 10 receives a request from the base station controller 30a transmitted through the traffic channel, the subscriber station 10 transmits a message for a mobile station acknowledge order to the base station controller 30a. Accordingly, the base station controller 30a transmits a message (Service option response order) for detailed enumeration of the service configuration for the call to the subscriber station (10), the subscriber station (10) according to the detailed service specification Therefore, traffic processing starts.

In addition, the base station controller 30a transmits an assignment message to the personal communication switch 40 while the wireless traffic channel and the wired line are set.

On the other hand, when the called party is notified that the call is in progress, the personal communication switch 40 transmits an alerting message indicating the status of the call to the calling base station controller, whereas if a call response exists by the called party. In addition to stopping the provision of the ring tone, the personal communication switch 40 connects the wired channel to the called party and transmits a connection message to the base station controller 30a indicating a connection state. When the controller 30a receives the Connect message, the controller 30a transmits a Connect acknowledge message to the personal communication switch 40.

If the call setup is requested from the subscriber station 10 by such a procedure, if the target for setting up the call is a subscriber station managed by the personal communication exchange 40, the call signal from the calling party subscriber station 10 The call is routed to the corresponding T-switch of the ASS-W via the T (time) -switch of the corresponding ASS-W and the S (Space) -switch of the INS-78. The terminal to be set up is called.

If the call setup target is a wired subscriber terminal 74 connected to the ASS-S 76, the T-switch of the ASS-W 72a, the S-switch of the INS 78, and the ASS. The connection with the wired subscriber terminal 74 to be set is made through the T-switch of the -S 76.

And, in the case of the communication network (PSTN, ISDN) that the call setup target is heterogeneous, call setup is performed through the ASS-T (80) via the INS (78).

In the state where the call is executed by such call setup, the billing is settled by the CCS 86, and the settled billing is transferred to the CAMA 88.

On the other hand, according to the procedure of the call incoming to the subscriber terminal 10, for example, the call setup is performed from the wired subscriber terminal 74 connected to the ASS-S 76 to the mobile subscriber terminal 10 side. In this case, the personal communication switch 40 transmits a paging request for incoming call processing to a base station controller (eg, 10a) that manages the subscriber station 10 of the incoming call destination. 10a transmits a page message including the address of the subscriber station 10 through the paging channel, and thus the subscriber station 10 provides a paging response through an access channel. It will send a message (Page response).

Subsequently, the base station controller 30a transmits a 'PAGING RESPONSE' message including layer 3 information to the personal communication switch 40, and successfully receives the message (page response) to the subscriber terminal 10. A message is sent to the base station acknowledge order.

The personal communication switch 40 transmits a set-up message to the base station controller 30a, and the base station controller 30a receives the set-up message. A call confirmed message is transmitted to the exchange 40. Subsequently, the personal communication switch 40 transmits an assignment reqeust message to the base station controller 30a for a radio channel allocation.

Upon receiving an assignment request message from the personal communication switch 40, the base station controller 30a connects a perfect audio path to a wired line and establishes a wireless traffic channel. A channel assignment message is transmitted to the subscriber station 10 via the paging channel of the wireless interface.

Then, the subscriber station 10 transmits a message (Traffic channel preamble) to the base station controller 30a through the designated reverse traffic channel, and when the base station controller 30a recognizes the reverse traffic channel, The base station controller 30a transmits a base station acknowledge order to the subscriber station 10 through a forward traffic channel.

When the subscriber station 10 receives a command from the base station controller 30a, the subscriber station 10 transmits a message for the mobile station acknowledge order to the base station controller 30a. Accordingly, the base station controller 30a A message (Service option response order) for enumerating the service configuration for the call in detail is transmitted to the subscriber station (10).

Accordingly, the subscriber station 10 performs traffic processing according to a detailed service specification, and when the wireless traffic channel and the wired line are established, the base station controller 30a sends a message (Assignment complete) to the personal communication switch 40. In addition to being transmitted to the side, a ring (ring) is generated by transmitting an alert message including information to the subscriber station 10, and the subscriber station 10 responds to the base station exchange 30a. Send a message (Mobile station acknowledgment).

Then, the base station controller 30a transmits an alerting message for notifying the personal communication switch 40 of the state of calling the subscriber station 10 of the called party, and receives a response from the called user. The subscriber station 10 transmits a message (Connect order) requiring an acknowledgment to the base station controller 30a.

Accordingly, the base station controller 30a transmits a base station acknowledgment message to the subscriber station 10 through a forward traffic channel to respond to the connect order. In addition, the base station controller 30 30a) transmits a message (Connect message) for notifying the reception of the incoming response to the personal communication switch (40). Accordingly, the personal communication switch 40 transmits a message (Connect acknowledge) for receiving an acknowledgment of the message (Connect message) to the base station controller (30a), and accordingly the incoming call to the subscriber terminal (10) The processing procedure is executed.

In addition, the personal communication exchange 60 of the other country is also configured to be the same or similar to the personal communication exchange 40 to execute a call processing service for a terminal or a wired subscriber terminal for personal mobile communication, the personal communication exchange Between the 40 and the personal communication switch 60 of the other station, to perform the interchange process for the relay call generated in the own country by the incoming / outgoing line matching process executed by the ASS-T 80. do.

However, in recent years, the three-person calling function is provided by calling two called party subscriber terminals from the calling party subscriber terminal to the personal communication exchange system, but an additional service for subscribers of personal mobile communication is assumed, The subscriber on the calling side calls the called party's subscriber to perform a group call, and the calling party's subscribers interconnect each other's subscribers, or the called party's subscribers and the third party's called party subscribers. There is a growing demand for the proper implementation of value-added services in cases where they intend to perform interconnection.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a conference call control method in a personal communication exchange system for enabling a conference call by sequentially calling a plurality of mobile subscriber stations by a mobile calling party subscriber terminal. The purpose is.

In order to achieve the above object, according to a preferred embodiment of the present invention, a plurality of base station controller responsible for the call setup of the radio for a plurality of mobile subscriber station; A plurality of matching exchange subsystems (ASS-W) including a T-switch for setting up a call to a corresponding subscriber station while managing the plurality of base station controllers, a switching network control (SNC) and a space switch (SSW); A personal communication exchange system comprising a network control subsystem (INS) including an LCC and a personal communication switch having an ASS-T for access to an HLR, the second subscriber serving as a calling party subscriber among the plurality of subscriber stations. The first subscriber terminal as the terminal and the called party subscriber makes a call between the second subscriber terminal and the third subscriber terminal while the first subscriber terminal calls the third subscriber terminal of the call transfer target during the call. A call transfer control method in a personal communication switching system is provided.

Further, according to the present invention, the setting of the call mode by the call transfer of the second to third subscriber terminals by the first subscriber terminal may be performed based on the location information from the HLR for the called subscriber terminal. Performing paging response / subscriber notification from the ASS-W of the corresponding subscriber station to the first ASS-W, and the call setup procedure between the ASS-W of the called subscriber station and the base station controller corresponding to the ASS-W. Executing an incoming call response process by the ASS-W of the called subscriber terminal to the ASS-W of the first subscriber terminal so that an incoming call signal is received from the subscriber terminal called by the first subscriber terminal. When the incoming call is received, a call to the subscriber terminal is called after the call subscriber is released from the first subscriber terminal and the call pending state of the previous subscriber terminal held by the first subscriber terminal is released. It will be written to the running step.

1 is a diagram illustrating a general personal communication exchange system;

FIG. 2 is a schematic block diagram of a personal communication switch shown in FIG. 1;

FIG. 3 is a block diagram illustrating a main part of a personal communication exchange executing a conference call control method in the personal communication exchange system shown in FIG. 2;

4A, B, C, and D are flowcharts for explaining a call transfer control method in a personal communication exchange system according to the present invention.

* Setting of symbols for the main parts of drawings

10a-10n: subscriber terminal, 20a-20n: base station,

30a-30n: base international flag, 40: exchanger,

50: Certification Center, 72a-72n: Match Exchange System (ASS-W),

74: wired subscriber terminal, 76: ASS-S,

78: network control subsystem (INS), 80: ASS-T,

720: PCSI, 722: PCC,

724: PSSC, 726: LSL,

728: PCTRC, 730: CPSC,

780: NTR, 782: SNC,

784: SSW, 786: LCC,

788: LRSC.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a diagram showing the main function block configuration of the personal communication switch 40 (FIG. 2) executing the call transfer control method in the personal communication exchange system according to the present invention.

In the figure, the ASS-W 72a configured in the personal communication switch 40 is a link management function used between the corresponding personal communication switch 40 and the base station controller 30a or the base station system BSSAP. PCSI (PCS interface control) 720 that handles application part (MM) function, some mobility management (MM) connection maintenance function and matching function with SCCP, and manages outgoing / receiving processing of the subscriber station 10a (i.e., subscriber) PCC call control (PCC) 722 for performing collection of information required for terminal call processing, request for number translation, switch connection control with signaling equipment, etc., and additional service control for the subscriber station 10a (i.e., idle PSSC as a personal communication subscriber supplementary service control block executing control of execution of a request for supplementary service occurring during / call / call setup / release and control of registration / deletion / activation / deactivation of supplementary service) PCS subscriber supplementary ser vice control; 724), a command procedure to be used in various execution modules by aggregating processes of a time switch, a signal device, a tone generator, and a concentrator, which are mounted in an ASP and commonly used in the ASS-W (72b-72n); Data base, software, mounted on the ASP (not shown), commonly used in the ASS-W (72b-72n) processing of Intra-Junctor, Time Switch, Signal Device, Tone, concentrator LSL (Local Service Shared Library726) consisting of Command Procedure and Data Base to be used by several execution modules, and consisting of one main process and one child process, the main process receives child transfer request signal which is initial signal The child process creates a process, and the child process hooks the subscriber who has registered the call forwarding function to transfer the call and dials the special code and called number to transfer the call. PCTRC 728, which performs call forwarding exclusively by controlling call forwarding function, connects with TCAP while performing an operation procedure, associative operation with application processor, instruction number and dialog number management, operation / error definition Call processing service control (CPSC) 730 as a call processing service control means for performing a basic encoding and decoding function for the parameter of the component with reference to the ASS-W (72b-72n) The same function block configuration as that of the ASS-W 72a is provided.

In FIG. 3, the INS 78 executes a translation of the requested number in response to the number translation request from the PCC 722 of the ASS-W 72a-72n, and notifies the number translation unit (Number translation). 780) SNC (Switching Network Control) 782, which performs the function of allocating and releasing a call for connection / release of a call to a channel of the entire switch (TST switch network) of the personal communication switching system, and the call processing service. A space switch (SSW) 784 for connecting and releasing a furnace, an LCC (LR call control) 786 as a VLR function for providing data required for mobile subscriber call processing, and a personal communication application unit (MAP). A block that executes the operation processing procedure for the interface between the LCC 786 and the question-and-answer application unit (TCAP). This function connects the TCAP, associates the application process with the operation, manages the indication number and dialog number, and defines the action / error. Of the component La perform basic encoding and decryption functions for metadata, LRSC to perform the operation level and display the timer value function (Location Service Register Control: 788) are presented and the like.

Next, the call transfer control method in the personal communication switching system according to the present invention executed by the above-described configuration will be described in detail with reference to the flowchart shown in FIG.

First, the first subscriber terminal 10a is set to the calling party and is hooked from the first subscriber terminal 10a in a busy state by the call processing procedure described with reference to FIGS. 1 and 2 with the second subscriber terminal 10b. When a flash signal is received by the PCSI 720 of the first ASS-W 72a via the first base international controller 30a and the SCCP in sequence (step 102), the first ASS-W 72a in step 104. The PCSI 720 reports the hook flash to the PCC 722, and the PCC 722 transmits the hook flash report to the PSSC 724. Accordingly, the PSSC 724 transmits the hook flash report to the second ASS-. A PCS service is requested to the PCC of W 72b.

Then, the PCC of the second ASS-W 72b requests service control from the PSSC of the second ASS-W 72b, and in step 106, the PSSC of the second ASS-W 72b responds to the request. The service recognition report is transmitted to the PSSC 724 of the first ASS-W 72a.

In response to the service recognition report, the PSSC 724 of the first ASS-W 72a requests the holding of the second subscriber station 10b to the PSSC of the second ASS-W 72b in step 108. In addition, the LSL 726 of the first ASS-W 72a is required to cut the speech path of the first subscriber terminal 10a. Accordingly, the second ASS-W 72b of the second ASS-W 72a is requested. In the PSSC, the LSL of the second ASS-W 72b requires the cutting of the speech path of the second subscriber terminal 10b and the holding of the second subscriber terminal 10b.

Subsequently, in step 112, the PSSC 724 of the first ASS-W 72a receives the additional information request signal for call transfer service request to the HLR through the CPSC 730 of the first ASS-W 72a. Feature), and thus the HLR side notifies the PSSC 724 of the first ASS-W 72a of the additional information request signal (Feature), and the PSSC of the first ASS-W 72a. 724 transmits a request signal to PCTRC 728 of the first ASS-W 72a for call transfer service request.

Then, in step 114, the PCTRC 728 of the first ASS-W 72a requests the NTR 780 of the INS 78 to block number translation, and sends a PCS call notification signal as a result of the number translation. If received ('PcsCallRP' received) As a result proceeds to step 116 to request the location information to the HLR via the CPSC, the HLR in the HLR based on the request of the LCC ( 786, the PCASSC 728 of the first ASS-W (72a) by sending a response signal to determine whether the first terminal (10a) is a local call to receive a local PCS call notification signal In case of receiving 'intPcsCallRP', the process proceeds to step 118, and the outgoing call processing is performed on the result of the determination as a foreign country.

Subsequently, the PCTRC 728 of the first ASS-W 72a performs a third ASS-W corresponding to the third subscriber terminal 10c after the LAI irradiation through the LCC 786 of the INS 78 in step 118. The paging request is transmitted to the PCC of 72c), and thus the paging procedure is performed at the PCC of the third ASS-W 72c. That is, the PCC of the third ASS-W 72c transmits the paging request to the corresponding PCSI, and the PCSI transmits the paging request message to the third base international controller 30c through the SCCP.

In response to the paging request message, the paging response message is transmitted from the third base international controller 30c to the PCSI side of the third ASS-W 72c via the SCCP. In the PCSI of the 3ASS-W 72c, The PCC of the third ASS-W 72c transmits the paging response to the PCTRC 728 of the first ASS-W 72a in step 120. The occupancy of the third subscriber station 10c as the third party is notified.

Subsequently, the PCTRC 728 of the first ASS-W 72a transmits a switch connection request to the LSL 72a-726 to perform a switch connection procedure in step 122, and the LSL 72a according to the transmission. -726 sends a switch connection request to the SNC 782 of the INS 78, and in response to the request, the SNC 782 requests a switch connection to the SSW 784. Subsequently, when the SSW 784 returns a response to the switch connection to the PCTRCs 72a-728, the PCTRCs 72a-728 transmits a switching connection response to the LSL 72a-726 and a voice. While requesting the connection of a path, a switch connection response is transmitted to the PCC 722 of the third ASS-W 72c.

Then, the PCCs 72c-722 transmit a switch information response to the LSL 72c-726 in step 124 and a call setup request message to the PCSIs 72c-720, and the PCSI 72c. 720, a call setup request message is transmitted to the base station controller 30c through the SCCP. Subsequently, when a call confirmation message is provided from the base station controller 30c to the PCSI 72c-720 via the SCCP in step 126, the call confirmation message is processed. The PCSI 72c-720 performs the call. An acknowledgment message is transmitted to the PCCs 72c-722, and thus the PCCs 72c-722 notify the base station controller 30c of the call allocation message through an SCCP.

Subsequently, if the call allocation completion from the base station controller 30c is provided to the PCSI 720 of the WP 3 ASS-W 72c via the SCCP, the PCSI 72c-720 sends the call allocation completion message to the PCC. You will be notified at (72c-722). Thereafter, when a ring tone signal is provided from the base station controller 30c via SCCP in step 128, the PCSI 72c-720 transfers the ring tone signal to the PCC 72c-722. In step 130, the PCC 72c-722 transmits the call connection request to the LSL 72c-726, and the third subscriber station 10c responds / notifies the first subscriber station 10a to the third subscriber. A ringing tone is heard from the terminal 10c.

As described above, when the first subscriber terminal 10a hears a ringing tone from the third subscriber terminal 10c, the first subscriber terminal 10a releases the call in the first embodiment. The second subscriber station 10b attempts to connect with the third subscriber station 10c. In the second embodiment, the first subscriber station 10a communicates with the third subscriber station 10c. After the first subscriber terminal 10a releases the call and the second subscriber terminal 10b attempts to connect with the third subscriber terminal 10c accordingly.

Next, the call release and call setup procedures of the first embodiment will be described with reference to the flowchart shown in FIG. 4C.

First, when a ringing tone signal is input to the first subscriber station 10a from the third subscriber station 10c, the signal is transmitted to the PCSI 72a-720 based on the SCCP in step 134 based on the signal. Accordingly, the PCSI 72a-720 transmits the call release message to the PCTRC 72a-728 in order to execute the release by the request of the first subscriber terminal. Then, the PCTRC 72a-728 sends a release command to the PCSI 72a-720, so that the PCSI 72a-720 sends a release command to the base station controller 30a via SCCP. Done.

Subsequently, in step 136, the PCTRCs 72a-728 transmit a recovery signal to the PCSIs 72a-720, and the recovery signals are transmitted from the PCSIs 72a-720 via the SCCP to the base station controller 30a. Is delivered to. Subsequently, the restoration completion signal from the base station controller 30a is transmitted to the PCSIs 72a-720 via the SCCP, and the restoration completion signal transmitted to the PCSIs 72a-720 is transferred to the PCTRCs 72a-728. In addition to the transmission, a recovery confirmation signal is transmitted through the SCCP, and the recovery confirmation signal is transmitted from the base station controller 30a to the SCCP. Subsequently, in step 138, the PCTRCs 72a through 728 transmit the switch disconnection signal to the SSW 784 via the LSLs 72a through 726 for the switch break.

Subsequently, the PCTRCs 72a-728 require a switch connection to the PSSC 72b-724 to release the second subscriber terminal 's pending sound, and the PSSC 72b-724 based on the switch connection request signal. As a result, a request is made to the LSL 72b-726 to release a pending sound, and at the same time, an S-switch cutting is requested to the SSW 784 via the LSL 72b-726 (step 140).

In operation 142, the PSSC 72b-724 sends an S-switch connection request signal to the SSW 784 via the LSL 72b-726 to attempt connection with the third subscriber station 10c. When the SSW 784 that received the signal sends a switch connection notification to the PSSC 72b-724, the PSSC 72b-724 sends a notification of the switch connection to the PCTRC 72b-728. In addition, by requesting the voice path connection to the LSL (72b-726), the ringing tone (ring back tone) from the third subscriber station (10c) can be heard by the second subscriber station (10b).

Subsequently, when the response of the called subscriber is notified from the base station controller 30c through the SCCP in step 144, the PCSI 72c-720 notifies the called subscriber response message to the PCTRC 72b-728. Accordingly, the PCTRCs 72b-728 make a call holding service request to the PCCs 72c-722, and the PCC 72c-722 requests call holding service control to the PSSC 72c-724. .

Then, in step 146, when the PSSC 72c-724 transmits a call holding service request recognition message to the PCTRC 72b-728, the PCTRC 72b-728 sends the call holding to the PSSC 72c-724. The response message for the service request recognition is transmitted, and the second subscriber station 10b and the third subscriber station 10c are in a call state.

Subsequently, referring to the flowchart shown in FIG. *, In the second embodiment, after the first subscriber terminal 10a talks to the third subscriber terminal 10c, the call is released and the second subscriber terminal 10b and the first subscriber terminal 10a are released. The procedure for setting up a call so that the three subscriber station 10c can be connected will be described.

First, when the first subscriber station 10a hears a ringing tone from the third subscriber station 10c in step 200 connected with the step 132, the base station controller 30c receives a notification from the base station controller 30c through the SCCP. The PCSI 72c-720 notifies the called party response message to the PCTRC 72a-728, whereby the PCTRC 72a-728 forwards the call-hold service to the PCC 72c-722 in step 202. A request is made, and the PCCs 72c-722 request the call hold service control to the PSSC 72c-724. Then, when the PSSC 72c-724 transmits the call waiting service request recognition message to the PCTRC 72a-728, the PCTRC 72b-728 recognizes the call waiting service request to the PSSC 72c-724. The PSSC 72c-724 transmits a call connection recognition signal to the PCSI 72c-720. Therefore, in step 204, the PCSI 72c-720 transmits a call connection recognition signal to the base station controller 30c via SCCP in step **. Accordingly, the first subscriber station 10a and the third subscriber The terminal 10c enters a call state.

Subsequently, the first subscriber station 10a transmits a call release request signal to the PCSI 72a-720 via the SCCP in step 206 for the call release request, thereby canceling the request by the first subscriber station. In order to do so, the PCSI 72a-720 sends its release message to the PCTRC 72a-728. Then, the PCTRC 72a-728 sends a release command to the PCSI 72a-720, so that the PCSI 72a-720 sends a release command to the base station controller 30a via SCCP. Done.

Subsequently, in step 208, the PCTRCs 72a-728 transmit a recovery signal to the PCSIs 72a-720, and the recovery signals are transmitted from the PCSIs 72a-720 via SCCP to the base station controller 30a. Is delivered to. Subsequently, the restoration completion signal from the base station controller 30a is transmitted to the PCSIs 72a-720 via the SCCP, and the restoration completion signal transmitted to the PCSIs 72a-720 is transferred to the PCTRCs 72a-728. In addition to the transmission, a recovery confirmation signal is transmitted through the SCCP, and the recovery confirmation signal is transmitted from the base station controller 30a to the SCCP. Subsequently, in step 210, the PCTRCs 72a-728 transmit a switch disconnection signal to the SSW 784 via the LSLs 72a-726 for the switch disconnection.

Subsequently, in step 212, the PCTRCs 72a-728 request a switch connection to the PSSC 72b-724 for the release of the second subscriber terminal's reserved sound, and the PSSC 72b-724 requests the switch connection. Based on the signal, a request is made to the LSL 72b-726 to release a pending sound, and together with the LSL 72b-726, an S-switch cutting is requested to the SSW 784. The PSSC 72b-724 transmits an S-switch connection request signal to the SSW 784 via the LSL 72b-726 to attempt connection with a third subscriber station 10c. When the SSW 784 receiving the signal sends a switch connection notification to the PSSC 72b-724, the PSSC 72b-724 sends a notification of the switch connection to the PCTRC 72b-728. A voice path connection is requested to the LSL 72b-726.

Therefore, the ringing tone of the third subscriber station 10c is listened to by the second subscriber station 10b, so that the call is possible between the second subscriber station 10b and the third subscriber station 10c. .

As described above, according to the call transfer control method in the personal communication exchange system according to the present invention, the calling party mobile subscriber can be connected to each other by calling after the calling party mobile subscriber transfers a plurality of called party mobile subscribers. It is possible to provide additional enhanced services for the mobile subscriber station, such as reducing the inconvenience of having to call another subscriber on the side.

Claims (5)

A plurality of base station controllers responsible for radio call setup for a plurality of mobile subscriber stations; A plurality of matching exchange subsystems (ASS-W) including a T-switch for setting up a call to a corresponding subscriber station while managing the plurality of base station controllers, a switching network control (SNC) and a space switch (SSW); In a personal communication exchange system comprising a network control subsystem (INS) including an LCC, and a personal communication switch having an ASS-T for access to the HLR, The first subscriber terminal as the calling party subscriber and the first subscriber terminal as the called party subscriber among the plurality of subscriber terminals call the third subscriber terminal to which the call is to be transferred, and the second subscriber terminal as the second subscriber terminal. Call transfer control method in a personal communication switching system, characterized in that the call can be made between the third subscriber terminal. 2. The method of claim 1, wherein the first subscriber terminal in the ASS-W of the first subscriber terminal in the process of calling the third subscriber station by performing the call transfer to the first subscriber terminal during the call with the second subscriber terminal; And requesting the ASS-W for the subscriber's terminal to disconnect the voice path and then requesting the call hold and the connection of the held sound. 2. The individual of claim 1, wherein the ASS-W of the first subscriber terminal includes the step of requesting a transfer service to the PCTRC when the third subscriber terminal is called with a pending tone connection to the second subscriber terminal. Call transfer control method in communication exchange system. The method of claim 1, wherein the setting of the call mode by the call transfer of the second to third subscriber terminals by the first subscriber terminal is performed based on the location information from the HLR for the called subscriber terminal. Performing paging response / subscriber notification from the ASS-W of the subscriber station to the first ASS-W, and the call setup procedure between the ASS-W of the called subscriber station and the base station controller corresponding to the ASS-W. Executing, the ASS-W of the called subscriber terminal executing the incoming response processing to the ASS-W of the first subscriber terminal to receive a ring tone signal from the subscriber terminal called with the first subscriber terminal; When the incoming call is received, a call is made between the caller of the first subscriber station and the caller terminal, which is called by releasing the call pending state of the previous subscriber station held by the first subscriber station. A method of controlling transfer from a private communication exchange system, characterized in that the step consisting equipped. 5. The call of claim 4, wherein the first subscriber's terminal releases a call after a call with a third subscriber who is called while receiving a ringing tone signal from the subscriber's terminal. Call transfer control method in a personal communication exchange system, characterized in that it further comprises the step of executing.