KR20000013074A - New channel establishment requirement method of mobile switching center in cellular system - Google Patents

Abstract

PURPOSE: A new channel establishment requirement method of a mobile switching center in cellular system is provided to transmit an information of an originate mobile switching center which is to require the new channel establishment in the cellular system to terminating mobile switching center, originate mobile switching center. CONSTITUTION: The new channel establishment requirement method of a mobile switching center in cellular system includes ten procedures. A first procedure is that an originate mobile switching center inquires a routing information to a home position register(44). A second procedure is that the home position register responses the routing information to the originate mobile switching center. A third procedure is that the originate mobile switching center performs a call establishment to the terminating mobile switching center A fourth procedure is that the terminating mobile switching center tests a message received a terminating subscriber. A fifth procedure is to require a new channel to the originate mobile switching center when the terminating mobile switching center fails to receive a message. A sixth procedure is that the originate mobile switching center requires a call conversion information of the terminating subscriber to the home position register. A seventh procedure is that the home position register carries the call conversion information of the terminating subscriber to the originate mobile switching center. An eighth procedure is that the originate mobile switching center sends the new channel establishment completion response to the terminating mobile switching center. A ninth procedure is that the terminating mobile switching center cuts trunk line connected to the originate mobile switching center. A tenth procedure is that the originate mobile switching center provides an additional service to the originating subscriber using a new trunk line.

Description

How to request rerouting of a mobile switching center in a cellular system

The present invention relates to a method for requesting rerouting of a mobile switching center in a cellular system. In particular, a method for transmitting a billing ID of a calling switching center to a destination switching center in case a calling subscriber fails to make a call with a called subscriber. It is about.

The cellular mobile communication system divides the entire service area into a plurality of wireless base station areas, constitutes cells, which are small service areas, and centrally controls these wireless base stations with a switching system to allow subscribers to move calls between cells. Allow you to continue.

1 is a block diagram of a conventional code division multiple access system. A base station transceiver subsystem (BTS) 20, 22, 24 provides a mobile communication service to a mobile station (MS) 10 via wireless. A base station controller (BSC) 30, 32 connects a plurality of base stations to a mobile switching center (MSC) 40, 42 via a relay line. The mobile switching center connects a number of base station controllers to another mobile switching center or a public switching telephone network (PSTN) 50.

Base stations 20, 22 and 24 and base station controllers 30 and 32 are collectively referred to as a base station subsystem (BSS). Network Management Center (NMC) 34 manages a network consisting of a base station controller, mobile switching center, and home locator.

The mobile switching center has a home location register (HLR) 44, which is a database that stores information of subscribers registered with it, and a visitor location register, which is a database, which stores information of mobile phones in its area. The subscriber's information is obtained from the Visitor Location Register (VLR) 41 and 43 to process the call of the mobile telephone.

The mobile phone first stores its information in the home location register. When the mobile phone moves to the area of another mobile MSC, the mobile phone sends its unique number to the visitor mobile switching center. The visitor mobile switching center receives the mobile phone's information from the home locator via the mobile phone's unique number. The visitor mobile switching center then updates the location information of the mobile telephone stored in the home location register. This series of processes is called location registration, and roaming is a phenomenon in which a mobile phone moves to another mobile switching center.

2 is a message flow diagram illustrating a location registration process of a mobile phone. The visitor mobile switching center 42 detects that the mobile telephone has entered its area and notifies the home location register 44 of the registration of the mobile telephone. Send an Acknowledge to the Ack to respond (120)

When the visitor mobile switching center 42 performs location registration, the visitor location registrar 43 of the mobile switching center assigns a mobile station roaming number (MSRN) to the mobile telephone. The visitor mobile switching center registers with the home location register using the mobile phone roaming number and its mobile switching center ID.

The mobile phone roaming number is used for call routing to the destination switching station when an incoming call to the mobile phone occurs while the mobile phone is located at the corresponding visitor mobile switching center 42.

3 is a message flow diagram illustrating a routing method of a mobile switching center according to the prior art. When any calling party calls the called party's mobile phone, the calling mobile switching center 40 associated with the calling party generates a billing ID to charge the calling party. The calling mobile switching center inquires the routing information inquiry to the registered home location register 44 of the called subscriber. (210) The home positioning register returns the result to the calling mobile switching center. The calling mobile switching center informs the calling mobile switching center of the mobile telephone roaming number assigned by the called mobile switching center 42 where the subscriber is located. The call establishment request is requested (230). The called mobile switching center calls to the called base station by the call setup process and requests to occupy the called subscriber.

If the called base station does not answer the call or the called subscriber does not answer, the called mobile switching center fails to ring (240) and the called mobile switching center performs a Transfer To Number Request to the home location register. (250) The home location register confirms the additional service of the called party from the stored subscriber information and returns the switching digit to the called mobile switching center. (260) The called mobile switching center uses the new relay line to confirm the confirmed called subscriber. Call setup is performed to provide additional services such as CallForWard (CFW) or Voice Mail Service (VMS).

In the prior art operated as described above, when the incoming mobile switching center fails to receive the incoming mobile switching center, it performs a supplementary service using a new relay line. However, the originating mobile switching center still performs the call setup process using the relay line with the incoming mobile switching center. Therefore, a relay line for call establishment between an originating mobile switching center and a destination mobile switching center and a relay line for performing additional services by the terminating mobile switching center are simultaneously used. This situation causes a problem that the traffic load of the trunk line connecting the mobile switching centers is increased and the trunk line efficiency is lowered.

The present invention has been made to solve the problems of the prior art operating as described above, and transmits information of the originating mobile switching center for requesting re-routing in the cellular system to the destination mobile switching center. It is an object to provide a rerouting method.

Another object of the present invention is to provide a method for requesting rerouting of a mobile switching center in a cellular system, which transmits charging ID information of the calling mobile switching center to a destination mobile switching center.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the invention and the accompanying drawings.

1 is a block diagram of a conventional code division multiple access system.

2 is a message flow diagram illustrating a location registration process of a mobile phone.

3 is a message flow diagram illustrating a routing method of a mobile switching center according to the prior art.

4 is a message flow diagram illustrating a rerouting method of a mobile switching center according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: mobile phone 20, 22, 24: base station

30,32: base station controller 34: network management center

40,42: Mobile Exchange Office 41,43: Visitor Locator

44: home locator 50: general telephone network

410: network ID 420: mobile switching center ID

430 Processor ID

In a cellular system according to the present invention, which is invented to achieve the above object, a preferred embodiment of a method for requesting rerouting of a mobile switching center is provided in a cellular system using a code division multiple access technique.

Inquiring routing information from the originating mobile switching center by the home location register;

Responding, by the home location register, the routing information result to the calling mobile switching center;

The originating mobile switching center performing call setup to the destination mobile switching center;

The destination mobile switching center attempting to ring the called subscriber;

Requesting, by the calling mobile switching center, rerouting if the incoming mobile switching center fails to receive the call;

Requesting, by the calling mobile switching center, call transfer information of the called subscriber to the home location register;

The home location register returns the call transfer information of the called subscriber to the calling mobile switching center;

Sending, by the originating mobile switching center, a rerouting completion response to the called mobile switching center;

The destination mobile switching center disconnects the relay line connected to the originating switching center; And

The originating mobile switching center uses the new relay line to provide additional services to the calling subscriber.

In an embodiment of the present invention, the process of the call setting by the originating mobile switching center to the destination mobile switching center includes the step of sending the charging ID to the destination mobile switching center by the calling mobile switching center.

In the request for rerouting to the calling mobile switching center, it is preferable to request rerouting to the calling mobile switching center using the charging ID.

Preferably, the billing ID is included in an initial address message (IAM) transmitted from the originating mobile switching center to the destination mobile switching center.

The billing ID preferably includes a network ID, a mobile switch ID, a processor ID for performing subscriber call processing, and a child processor ID.

Another preferred embodiment of the method for requesting rerouting of a mobile switching center in a cellular system according to the present invention is a cellular system using a code division multiple access technique.

Inquiring routing information from the originating mobile switching center by the home location register;

Responding, by the home location register, the routing information result to the calling mobile switching center;

Transmitting, by the calling mobile switching center, a processor ID in the calling mobile switching center performing subscriber call processing while performing call setup using the routing information result;

And when the called mobile switching center fails to receive the call, requesting resetting of the route from the calling mobile switching center using the processor ID.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

According to the present invention, the originating mobile switching center transmits the billing ID to the called mobile switching center when the call is set up. The destination mobile switching center knows the ID of the calling mobile switching center and the ID of the processor handling the call of the calling subscriber at the calling mobile switching center through the charging ID. Therefore, the terminating mobile switching center that fails to receive can directly request rerouting to the calling mobile switching center.

The calling mobile switching center is requested to set up rerouting from the called mobile switching center, performs a call transfer information request for the calling subscriber, and provides additional services to the calling subscriber. When the originating mobile switching center completes the rerouting and sends a completion response to the called mobile switching center through the above procedure, the terminating mobile switching center disconnects the relay line connected to the originating mobile switching center. The calling mobile switching center then uses the new trunk line to provide additional services to the calling subscriber.

As described above, the present invention provides a method for an originating mobile switching center to transmit a charging ID including a subscriber call processing processor ID to a terminating mobile switching center, so that the terminating mobile switching center can request resetting of the originating mobile switching center. .

4 is a message flow diagram illustrating a rerouting method of a mobile switching center according to the present invention. Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention.

When any calling party calls the called party's mobile phone, the calling mobile switching center 40 associated with the calling party generates a billing ID to charge the calling party. The originating mobile switching center assigns one call processing processor to the calling subscriber and includes the ID of the processor in the billing ID.

The calling mobile switching center inquires routing information to the registered home location register 44 by the called subscriber. (310) The home positioning register returns a routing information inquiry result to the calling mobile switching center. The calling mobile switching center notifies the calling mobile switching center of the mobile telephone roaming number (MSRN) allocated by the called mobile switching center 42 where the subscriber is located. In step 330, the originating mobile switching center includes the charging ID in an initial address message (IAM) transmitted to the called mobile switching center.

If the called base station does not answer the call or the called subscriber does not answer, the called mobile switching center fails to ring (340), and the called mobile switching center requests redirection to the calling mobile switching center using the charging ID information. Invoke. (350)

The calling mobile switching center is requested to set up a re-routing, and transmits a transfer to number request invoked to the home location register. (360) The home location register checks the additional service of the called party from the stored subscriber information, Transfer To Number Request Return Result is returned to the originating mobile switching center (370).

The originating mobile switching center receives the diversion digit from the home location register and sends a redirection request return result to the terminating mobile switching center. The incoming mobile switching center receives the rerouting completion response and disconnects the relay line connected to the calling switching center (390).

If the terminating mobile switching center does not receive a rerouting completion response from the originating mobile switching station because of an error in the originating mobile switching station, the home location register, or the relay line, the terminating mobile switching center requests the call transfer information again.

When the trunk line is disconnected, the outgoing mobile switching center uses the new trunk line to provide additional services for incoming subscribers identified from the home locator, such as CallForWard (CFW) or Voice Mail Service (VMS). Perform call setup to provide a call (400).

As mentioned above, the originating mobile switching center is informed of the mobile phone roaming number from the home location register and informs the charging mobile switching station of the charging ID at the call setup. To this end, the route within the mobile communication network basically uses No. 7 Integrated Services Digital Network User Part (ISDN User Part) signaling.

The initial address message transmitted from the originating mobile switching center to the terminating mobile switching center in the call setup includes the billing ID. 5 shows the format of a billing ID message transmitted to the destination mobile switching center by the present invention. As shown, one to two octets (8 bits) are network ID 410, three octets are mobile exchange ID 420, and four to six octets are processor ID 430. Processor ID 430 is composed of 8 bits indicating the ID of the call processing processor, and 16 bits indicating the ID of the child processor (Child Processor) of the processor.

The information of the billing ID configured as described above is included in the initial address message and transmitted to the destination mobile switching center.

The present invention can be variously modified and can take various forms and only the specific embodiments thereof are described in the detailed description of the invention. It is to be understood, however, that the present invention is not limited to the specific forms mentioned in the detailed description of the invention, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood to do.

In the present invention operating as described above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The originating mobile switching center forwards the billing ID including the ID of the processor performing the call processing to the terminating mobile switching center, so that the terminating mobile switching center may request rerouting to the originating mobile switching center. The terminating mobile switching center may request the originating mobile switching center to re-route using the billing ID, even if the terminating mobile switching center fails.

The calling mobile switching center then provides the supplementary service to the calling subscriber, thereby eliminating the waste of the trunk line caused by the called mobile switching center providing the supplementary service. In addition, the present invention can eliminate unnecessary occupied relay lines, eliminate overload elements of the mobile switching center, and increase the efficiency of the mobile switching center.

Claims (6)

In a cellular system using code division multiple access technology, Inquiring routing information from the originating mobile switching center by the home location register; Responding, by the home location register, the routing information result to the calling mobile switching center; The originating mobile switching center performing call setup to the destination mobile switching center; The destination mobile switching center attempting to ring the called subscriber; Requesting, by the calling mobile switching center, rerouting if the incoming mobile switching center fails to receive the call; Requesting, by the calling mobile switching center, call transfer information of the called subscriber to the home location register; The home location register returns the call transfer information of the called subscriber to the calling mobile switching center; Sending, by the originating mobile switching center, a rerouting completion response to the called mobile switching center; The destination mobile switching center disconnects the relay line connected to the originating switching center; And A method for requesting rerouting of a mobile switch in a cellular system, comprising the step of providing a supplementary service to an originating subscriber by the originating mobile switching center using a new relay line. 2. The rerouting of a mobile switching system in a cellular system according to claim 1, wherein the step of performing call setup by the calling mobile switching center comprises the step of sending the charging ID to the called mobile switching center by the calling mobile switching center. Request method. 3. The method of claim 2, wherein the requesting of the rerouting to the originating mobile switching center requires rerouting of the mobile switching center using the charging ID. 4. The method according to claim 2 or 3, wherein the charging ID is included in an initial address message (IAM) transmitted from the originating mobile switching center to the destination mobile switching center. The method of claim 4, wherein the billing ID, Network ID; Mobile exchanger ID; Processor ID performing subscriber call processing, and A method for requesting rerouting of a mobile exchange in a cellular system, comprising a child processor ID. In a cellular system using code division multiple access technology, Inquiring routing information from the originating mobile switching center by the home location register; Responding, by the home location register, the routing information result to the calling mobile switching center; Transmitting, by the originating mobile switching center, a processor ID in the originating mobile switching center performing subscriber call processing while performing call setup using the routing information result; And And requesting rerouting from an originating mobile switching center by using the processor ID when the terminating mobile switching center fails to receive a call.