KR20000060427A - Method for operating IS-41C Redirection Request Map for MSC of CDMA System - Google Patents

Abstract

PURPOSE: A method for operating an IS-41C re-instruction request map for a code division multiple access(CDMA) mobile connection switch is provided for increasing a system efficiency, decreasing an error possibility and easily implementing a debugging operation for detecting an error. CONSTITUTION: When a digital cellular system/personal communication system(DCS/PCS) subscriber presses a subscriber number of a certain terminal(MIN+SEND mode), an arrival and transmission switch transmits a Location Request signal which requests the position of an arrival subscriber to a corresponding home position register(S300, S400). The home position register which received Location Request compares a transmission switch ID(MSCID) of Location Request and a switch ID(MSCID) of the arrival subscriber. When same, Termination List of Location Request is set to Local Term and is transmitted to a transmission switch.

Description

Method for operating IS-41C Redirection Request Map for MSC of CDMA System in Code Division Multiple Access Mobile Switch

The present invention relates to a method for improving an IS-41C map operation procedure, which is an interworking standard between code division multiple access (CDMA) mobile switching centers (MSCs). This chapter describes how to operate the IS-41C Redirection Request Map to increase the efficiency of the system by reducing the procedure of Redirection Request.

1 and 2 are flowcharts of a conventional IS-41C redirection request map operating procedure. Referring to this, if the subscriber of the Digital Cellular System (DCS) / Personal Communication Service (PCS) presses the mobile identification number (MIN) of the desired terminal (Mobile Station: MS) ( In MIN + SEND), the originating exchange sends a LocationRequest requesting the location of the called subscriber to the corresponding Home Location Register (HLR) (s100, s200).

The home location register that receives the LocationRequest compares the MSCID information in the LocationRequest with the exchange ID to which the called party belongs, and if it is the same, sets the TerminationList of the locationrequest to LocalTerm and sends it to the calling exchange if it is different. In order to obtain a number (Temporary Local Directory Number: TLDN), RoutingRequest is sent to the exchange corresponding to the destination exchange ID (s102, s202).

The visitor location register (VLR) of the exchange receiving the RoutingRequest generates a TLDN and sends it to the home location register as the return result of the routing request (s104, s204), which receives the home location register in the RoutingInfo in the locationrequest parameter. TLDN information is sent to the originating exchange (s106, s206).

If the originating exchange is a local call, the call proceeds through an internal call processing procedure, and in the case of a TLDN call, the originating exchange performs a call processing procedure with the destination exchange through the corresponding route (s108 and 208). At this time, the status of the called subscriber is Paging No Answer, Ring No Answer, or the callee's status is Busy before call setup (Call ForWard: CFW) or If the supplementary service of the voice mail service (hereinafter referred to as VMS) is registered as CFW_NA, CFW_BUSY, CFW_Default, VMS_NA, VMS_BUSY, and VMS_Default, the destination exchange receives the PC subsystem number (Personal) received from the home location register at the RoutingRequest. Based on the information of the Computer SubSystem Number (PC_SSN), RedirectionRequest requesting the call exchange to retry the call is sent. Mobile Identification Number (MIN) = Served MS MIN, Electronic Serial Number (ESN) = Served MS ESN, Set and send parameters such as RedirectionReason (s110, s210).

Receiving the RedirectionRequest, the originating exchange sends a TransferToNumberRequest, which is the subscriber's switching information request map operation with parameters such as BillingID, Served MS MIN, Served MS ESN, RedirectionReason, and TRANSCAP, to the corresponding home location register (s112, s212).

The home location register retrieves the subscriber's database (DB) to obtain conversion information. At this time, if the switching information is a general subscriber, a transfertonumberrequest in which the MIN number of the switching subscriber is set in RoutingInfo is sent to the calling exchange (S114). In addition, if the switching information is a VMS connection and the VMS is a local VMS, a VMS ID (VMSID) is set in RoutingInfo, and if a VMS connection is in another station, a transfertonumberrequest that sets the received TLDN for the VMS connection from the VMS HOST MSC is sent to the originating exchange (s218 ).

The originating exchange receiving the transfertonumberrequest releases the call path connected to the exchange requesting the RedirectionRequest (s116, s118, s220, s222). If the conversion information received from the home location register is a general subscriber, request a LocationRequest to the corresponding home location register (s120). If the local VMS is connected, the call proceeds with the local VMS, and if it is another VMS, the transfertonumberrequest. The received TLDN proceeds to call the VMS host exchange (VMS HOST MSC) and the VMS connection (s224).

The prior art operating as described above has the following problems.

In the New Century or pre-IS-41C map of SK Telecom, if the incoming subscriber's status is paging-free or ring-free, and CFW and VMS supplementary services are registered, the called exchange sends a call to its home location register to request a call to TransferToNumberRequest. The destination exchange is supposed to proceed.

However, the IS-41C map uses the RedirectionRequest map operation in which the destination exchange requires the originating exchange to retry the call in order for the originating exchange to proceed with the call rather than the destination.The originating exchange that receives the RedirectionRequest must transfer the call. A map operation called TransferToNumberRequest is sent to the home location register requesting information.

However, since the home location register has not only subscriber switching information but also subscriber status, additional service information, etc., the complexity of the map processing procedure decreases the efficiency and the probability of error increases.

In addition, the current RedirectionRequest processing is inefficient in terms of relay line use by requiring the call exchange to be connected to the destination exchange when the originating exchange receives a return result for the TransferToNumberRequest from the home location register.

A virtually important element of solving the problem is that the home location register not only has subscriber switching information but also subscriber status, additional service information, and the like.

Therefore, the present invention was devised to solve the above problems, and the state of the called subscriber is busy before paging non-response, ring non-response, or call setup, while CFW_NA, CFW_BUSY, CFW_Default, VMS_NA, VMS_BUSY, If the VMS_Default supplementary service is registered, the terminating exchange immediately releases the call path associated with the originating exchange and sends a RedirectionRequest to the home location register, thereby improving the efficiency of the system. It aims to provide city demand map operation method.

1 is a flowchart illustrating an IS-41C redirection request map operating procedure when the conventional switching information is a general subscriber.

FIG. 2 is a flow chart illustrating an IS-41C redirect request map operating procedure when the conventional switch information is a voice mailbox service (VMS) connection. FIG.

3 is a flowchart illustrating an IS-41C redirect request map operating procedure when switching information according to the present invention is a general subscriber;

4 is a flowchart illustrating an IS-41C redirection request map operating procedure when the switch information according to the present invention is a voice mailbox service (VMS) connection.

A preferred embodiment of the IS-41C redirection request map operating method in a code division multiple access mobile communication switch according to the present invention, which is invented to achieve the above object, is that the status of a called subscriber is either paging-free or ring-free, or a call. If the incoming subscriber's status is busy and additional services such as Call Forwarding Service (CFW) or Voice Mail Service (VMS) have been registered prior to the setup, the destination exchange will be responsible for the originating exchange ID (MSCID) and PC subsystem number (PC_SSN) information. S310, s410 releases the call path connected to the originating exchange, and sends the redirection request signal, RedirectionRequest, to the home location register (s312, s412), and the home location register that receives the RedirectionRequest receives the database of the subscriber. Retrieving conversion information received by the originating exchange, wherein the conversion information received by the originating exchange is general; If so, the home location register sends a TransferToNumberDirective signal in which a subscriber number (MIN) is set in RoutingInfo, which is a parameter including call routing information, to the originating exchange corresponding to the exchange ID transmitted in the redirection request ( s314), and the originating exchange that has received the TransferToNumberDirective signal includes the steps s316 and s420 of proceeding with the call again with the received switching information.

In this embodiment, if the switching information received by the originating exchange is a voice mail service (VMS) connection, the home location register receives a temporary local directory number (TLDN) necessary for VMS access from the voice mail host exchange to which the subscriber belongs. (s414, s416), and sending the TransferToNumberDirective having the TLDN set to the RoutingInfo to the calling exchange (s418).

The embodiment also includes the steps of sending the transfertonumberdirective to the home location register by the originating exchange receiving the TransferToNumberDirective signal (s316 and s420), and sending the redirection request to the destination exchange by the home location register receiving the transfertonumberdirective (s318 and s422). And the calling exchanger sees the information of RoutingInfo received at TransferToNumberDirective, and if it is a general subscriber, sends a LocationRequest requesting the location of the subscriber to the home location register (s320), and the information of RoutingInfo is the voice mail service ID (VMSID). ) Or TLDN, further comprising the step (s424) of proceeding with a call for access to the voice mailbox service. When an error for the RedirectionRequest occurs, the home location register transmits a result for the RedirectionRequest. Incoming call with additional error code in redirectionrequest Further comprises the step of sending group.

In the present embodiment, the RedirectionRequest sent from the destination exchange to the home location register includes a Served MS MIN indicating a subscriber number of a terminal to be called, a Served MS ESN indicating a device serial number of a terminal to be called, and a redirection request. Parameters such as REDREASON containing the reason for the outgoing call, and the originating MSCID indicating the ID of the originating exchange, and the TransferToNumberDirective sent from the home location register to the originating exchange includes a Served MS MIN representing the subscriber number of the terminal to be called. , A Served MS ESN indicating the device serial number of the terminal to be called, a RoutingInfo containing information to be routed, a TERMTRIG to which the called subscriber can perform, an ANNLIST for tone or announcements, and the subscriber's switching DMH-Rdirection In indicating whether or not Contains parameters such as dicator.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. 3 and 4 are flowcharts illustrating an IS-41C redirection request map operating procedure according to the present invention. Referring to this, when a subscriber of a digital cellular system / personal mobile communication service (DCS / PCS) presses the desired subscriber's subscriber number (at MIN + SEND), the calling exchange sends a LocationRequest requesting the called subscriber's location to the corresponding home location register. Send to (s300, s400).

The home location register receiving the LocationRequest compares the MSCID information in the LocationRequest with the MSCID to which the called party belongs, and if it is the same, sets the TerminationList of the locationrequest to LocalTerm and sends it to the calling exchange if it is different. In order to obtain the TLDN, RoutingRequest is sent to the exchange corresponding to the destination exchange ID (s302, s402). Then, the visitor location register of the exchange receiving the RoutingRequest generates a TLDN and sends it to the home location register as a result of the routing request (s304, s404). The home location register receives the TLDN information in RoutingInfo in the locationrequest parameter and sends it to the calling exchange. (s306, s406).

If the originating exchange is a local call, the call proceeds through an internal call processing procedure, and in the case of a TLDN call, the originating exchange performs a call processing procedure with the destination exchange through the corresponding path (s308 and 408). At this time, the destination exchange is an incoming call received by RoutingRequest if the status of the called subscriber is busy before paging non-response, ring answering or call setup and the CFW_NA, CFW_BUSY, CFW_Default, VMS_NA, VMS_BUSY, and VMS_Default supplementary services are registered. Based on the exchange ID (MSCID) and PC subsystem number (PC_SSN) information, the channel is disconnected from the calling exchange (s310, s410), and a RedirectionRequest is set with parameters such as Served MS MIN, Served MS ESN, REDREASON, and Outgoing MSCID. Send to the home location register (s312, s412). See Table 1 below for parameters of RedirectionRequest.

parameter Usage type MIN Subscriber number of terminal to be called necessary ESN Device serial number of the terminal to be called necessary REDREASON Reason for Redirect Request necessary MSCID Exchange ID of the originating exchange necessary

The home location register receiving the RedirectionRequest searches for the subscriber's database to obtain the redirection information. At this time, when the switching information received by the calling exchange is a general subscriber, TransferToNumberDirective in which the MIN number and DMH_RedirectionIndicator, etc., which are switched to RoutingInfo, are set to the calling exchange corresponding to the exchange ID (MSCID) that the called exchange delivered at the redirection request. Send (s314). And, if the switching information is a VMS (Voice Mail Service) connection, the home location register looks at the VMS ID (VMSID) of the subscriber to the VMS HOST MSC to which the subscriber belongs, such as TERMTREAT = VSM and DESTDGTS = VMSID. Sends the configured RoutingRequest (s414). The VMS host exchange receiving the RoutingRequest stores the information in the visitor location register and sends the TLDN required for call establishment to the home location register as the return value of the routing request (s416). Then, the home location register receiving the TLDN sends a TransferToNumberDirective with parameters such as RoutingInfo and DMH_RedirectionIndicator to the originating exchange (s418). See Table 2 below for the parameters of TransferToNumberDirective.

parameter Usage type MIN Subscriber number of terminal to be called necessary ESN Device serial number of the terminal to be called necessary RoutingInfo: [TerminationList] [Digits (Destination)] [Digits (Csrrier)] Call routing information: Network terminal information PSTN DN used for call routing PC of called party Selection selection ACTCODE Include if action to be performed is not implied throuth presence of other parameters Selection TERMTRIG Empowering the called subscriber Selection ANNLIST Tone or broadcast list Selection DMHData: [DMH_AccountCodeDigits] [DMH_AlternateBillingDigits] [DMH_BillingDigits] [DMH_RdirectionIndicator] [MobileDirectoryNumber] Data for DMH recording: Include if applicable Include if applicable Include reason for expanding the incoming call if applicable Include if applicable Selection Selection Selection Required Selection

The originating exchange receiving the TransferToNumberDirective sends a transfertonumberdirective to the home location register (s316 and s420), and the home location register sends a redirection request to the destination exchange (s318 and s422). At this time, when an error for RedirectionRequest occurs, the home location register sends an error code to the destination exchange with an error code in the redirection request.

The originating exchange looks at the RoutingInfo information received at TransferToNumberDirective, and if it is a regular subscriber, sends a LocationRequest requesting the subscriber's location to the home location register (s320), and if the RoutingInfo information is VMSID and TLDN, access to the corresponding VMS is made. Proceed to call for (s422).

When the destination exchange requests a RedirectionRequest to the home location register in the state of paging non-response, ring non-response, etc., the home location register delivers a new map operation, TransferToNumberRequest, containing call transfer information to the originating exchange, and the originating exchange exchanges the transfer information. The call will be retried with, which is simpler than the previous RedirectionRequest procedure. Therefore, it not only increases the efficiency of the system, but also reduces the possibility of error, and makes it easy to debug the error detection.

In addition, if a call retry is required according to the subscriber's status, the destination exchange requires a RedirectionRequest to the home location register rather than the originating exchange, thereby eliminating the need to continuously maintain the call path associated with the originating exchange, thereby increasing the efficiency of using a relay line. Can be.

Claims (6)

If the called party's status is paging or no ring answering, or the called party's status is busy before call setup, and additional services such as call forwarding service (CFW) or voice mail service (VMS) are registered, The called exchange releases the call path connected to the calling exchange based on the calling exchange ID (MSCID) and the PC subsystem number (PC_SSN) information, and sends a redirection request, a redirection request signal, to the home location register; The home location register receiving the RedirectionRequest, searching the database of the subscriber to obtain the switching information received by the originating exchange; If the switching information received by the originating exchange is a general subscriber, the home location register transfers a TransferToNumberDirective signal having a subscriber number (MIN) set to RoutingInfo, which is a parameter including call routing information, upon the redirection request. Sending to the calling exchange corresponding to the ID; And And the originating exchange receiving the TransferToNumberDirective signal, proceeds with a call again with the received switching information. 12. The method of operating an IS-41C redirection request map in a switch for code division multiple access mobile communication. 2. The method of claim 1, wherein if the switching information received by the originating exchange is a voice mailbox service (VMS) connection, the home location register obtains a temporary local directory number (TLDN) required for the VMS connection from the voice mailbox host exchange to which the subscriber belongs. Receiving, and sending the TransferToNumberDirective having a TLDN set to the RoutingInfo to an originating exchange. 21. The method of operating an IS-41C redirection request map in a switch for code division multiple access mobile communication. The method according to claim 1 or 2, The originating exchange receiving the TransferToNumberDirective signal sends a transfertonumberdirective to the home location register; Receiving a transfertonumberdirective, the home location register sends a redirection request to a destination exchange; And The calling exchange looks at the information of the RoutingInfo received at TransferToNumberDirective, and if it is a general subscriber, sends a LocationRequest requesting the location of the subscriber to the home location registrar, and if the information of RoutingInfo is the voice mailbox service ID (VOMID) or TLDN, A method for operating an IS-41C redirection request map in an exchange for code division multiple access mobile communication, further comprising the step of proceeding with a call for access to a voice mailbox service. 4. The code division of claim 3, further comprising: when the error for the RedirectionRequest occurs, the home location register further includes sending an error code to the destination exchange in a redirection request that sends the result for the RedirectionRequest. How to operate IS-41C Redirection Request Map in Switching System for Multiple Access Mobile Communication. The method of claim 4, wherein the RedirectionRequest sent from the destination exchange to the home location register is as follows: A Served MS MIN parameter indicating a subscriber number of a terminal to be called; A Served MS ESN parameter indicating the device serial number of the terminal to be called; REDREASON parameter containing the reason for the redirect request; And A method of operating an IS-41C redirect request map in an exchange for code division multiple access mobile communication with an originating MSCID parameter indicating the identity of the originating exchange. 6. The TransferToNumberDirective of claim 5, wherein the home location register sends to the originating exchange, A Served MS MIN parameter indicating a subscriber number of a terminal to be called; A Served MS ESN parameter indicating the device serial number of the terminal to be called; A RoutingInfo parameter containing information to route; A TERMTRIG parameter that gives the called subscriber the ability to do so; ANNLIST parameter for tone or announcements; And A method of operating an IS-41C redirection request map in a switch for code division multiple access mobile communication with a DMH-Rdirection Indicator parameter indicating how the subscriber will be diverted.