KR100304937B1 - Method for managing a radio access network, the network is contacting to unequal MSCs in Mobile Communication System - Google Patents

Abstract

The present invention relates to a mobile communication system, and in particular, in a next generation mobile communication system, a wireless access network (RAN) connected to a switching center (MSC) maintains a constant call processing performance regardless of the asynchronous transmission mode (ATM) of the switching center (MSC). The present invention relates to a method of operating a wireless access network that connects to a heterogeneous switching center in a mobile communication system. In the mobile communication system according to the present invention, a method of operating a wireless access network for connecting to a heterogeneous switching center includes at least one switching station and a wireless access network (RAN) for connecting to the switching station. If a call connection is requested from a node, checking whether the switching center is based on an asynchronous transmission mode (ATM); and according to a result of the check, the switching station converts a message type related to the requested call connection to the wireless station. Transmitting to the access network (RAN), and the wireless access network receiving the converted message processes the requested call connection according to the converted message, thereby maintaining the call processing capability of the predetermined wireless access network. It is effective to maintain.

Description

Method for managing a radio access network, the network is contacting to unequal MSCs in Mobile Communication System}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly, to an asynchronous transfer mode of an MSC in a radio access network (hereinafter referred to as RAN) connected to an MSC in a next generation mobile communication system. The present invention relates to a method of operating a wireless access network that connects to a heterogeneous switching center in a mobile communication system suitable for maintaining a constant call processing performance regardless of ATM.

In general, IMT-2000, the next-generation mobile communication system, refers to a so-called 'future land and land mobile communication system' that can transmit voice, text, image, and multimedia information, and enables international roaming to be used anywhere in the world. A wireless communication service can be provided using a terminal.

This next generation mobile communication system is described next.

1 is a block diagram illustrating a part of a next generation mobile communication system according to the related art.

Referring to FIG. 1, a next generation mobile communication system includes a base station 110 for wirelessly connecting a mobile station 100a to 100n, a mobile station 100a to 100n, and connecting an incoming / outgoing call, and a radio to control the base station 110. Registers the position information of the network controller (Radio Network Controller, hereinafter abbreviated as NRC) 120, the exchange station 130 that processes incoming / outgoing calls with the mobile stations 100a to 100n, and the mobile stations 100a to 100n. And a home location register (HLR) 140 for managing.

Herein, the base station 110 and the RNC 120 are collectively referred to as a radio access network (hereinafter abbreviated as RAN), and the core network including a switching center 130 and a home location register 140. Abbreviated to CN hereinafter).

The mobile station may be connected to a plurality of RANs according to movement, and communication networks such as a public switched telephone network (PSTN), an internet network, and a packet data network are connected to the CN. At this time, the internet network and the packet data network are connected to the CN through a PDGN (Packet Data Gateway Node).

In the next generation mobile communication system configured as described above, the exchange station 130 and the RNC 120 provide a communication service to a subscriber by unifying a message format exchanged with each other. This is because the RNC 120 of the RAN, which is the lower end connected to the switching center 130 depending on whether the switching center 130 operates based on ATM (ATM-Based authorization) or does not operate based on ATM (Non-ATM-Based authorization). And the operation of the base station 110 is also determined. Accordingly, the switching center 130 and the RNC 120 exchange messages with each other in a single message format depending on whether the switching station 130 has an ATM-based operation.

The reason for exchanging signals as a single message format between the exchange station 130 and the RNC 120 is that if the exchanged message formats are different, it is difficult to maintain the performance of RNC call processing, in particular, the BHCA (Busy Hour Call Attempts). Because it becomes difficult.

Therefore, in order to exchange signals with each other in a single message format, the RNC 120 and the base station 110 are set to operate in the same manner depending on whether the upper level switching station is ATM-Based.

That is, an ATM-Based RNC is connected to an ATM-Based Switching Station, and a Non-ATM-Based RNC is connected to a Switching Station that is Non-ATM-Based.

As shown in FIG. 2, a mobile communication system configured according to whether the switching center operates in ATM-Based mode.

Referring to FIG. 2, in the mobile communication system, an exchange station may be classified into an ATM-based exchange station 230 and a non-ATM-based exchange station 240 according to whether an ATM-based operation is performed. RNCs 220n to 220n connected to the switching center 240, which is non-ATM-based, are set to operate as ATM-based RNC and non-ATM-Based RNC, respectively.

At this time, in order to maintain a certain level of BHCA performance in the RAN of the mobile communication system, the conversion of the message format transmitted between the switching centers 230 and 240 and the RNCs 220a to 220n may be performed in a system having a different load due to the provision of a communication service. In comparison, relatively few base stations 210a to 210n are in charge.

Therefore, a plurality of ATM-Based RNCs and Non-ATM-Based RNCs are simultaneously connected to one Switching Station 230 and 240, or an ATM-Based Switching Station and a Non-ATM-Based Switching Station is connected to one RNC. Once connected, the software packages of the RNCs 220a-220n and the base stations 210a-210n are manually adjusted by the system operator so that message format conversion is performed at the base stations 210a-210n.

That is, the system operator manually manipulates the software packages of the RNCs 220a to 220n and the base stations 210a to 210n to operate the RNC 220a to 220n and the base station 210a according to whether the switching centers 230 and 240 are ATM-based. 210 n to set the same operation as that of the switching centers 230 and 240. FIG.

However, such a mobile communication system has a constant BHCA performance in the RNC due to overlapping load due to message format conversion to a base station when an ATM-based RNC or a non-ATM-Based RNC is connected to one switching center together. Can't keep up. This is because the messages transmitted to the RNC are in cell units when the exchange is operating in ATM-Based, so the base station must process the information in bit units. When the exchange is operating in non-ATM-based, it is in bytes. This is because when the switching center and the RNC are configured based on different heterogeneous systems (i.e., ATM systems), the base station converts the transmitted messages at the base station, which adds a lot of load to the base station.

In addition, the system operator must manually manage the software package of the RNC and the base station of the RAN according to the ATM-based operation of the switching station to prevent the deterioration of the BHCA performance of the RNC. Do.

Therefore, the current mobile communication system has a problem in that the quality of the communication service provided by the mobile communication system is deteriorated because it does not maintain the BHCA performance of a certain RAN and performs an unstable call when heterogeneous RANs are connected to one switching station. .

Accordingly, an object of the present invention has been made in view of the above-mentioned problems of the prior art, and is connected to a heterogeneous switching center in a mobile communication system that maintains a constant RNC call processing performance regardless of whether the switching center has an ATM-Based operation. It is to provide a method of operating a wireless access network.

According to one aspect of the present invention, a method of operating a wireless access network for connecting to a heterogeneous switching station in a mobile communication system includes at least one or more switching stations and a wireless access network (RAN) for connecting to the switching station. When the call connection is requested from any node, checking whether or not the switching center is based on the asynchronous transmission mode (ATM), and according to the result of the check, the switching station forms a message related to the requested call connection. Converting and transmitting the converted message to the radio access network (RAN), and the radio access network receiving the converted message processes the requested call connection according to the converted message.

Preferably, when the switching center operates based on the asynchronous transmission mode, the message is generated by the ATM-Based message and then transmitted to the wireless access network by setting the most significant bit of the first parameter of the ATM-Based message. If the switching center does not operate based on the asynchronous transmission mode, it generates a Non-ATM-Based message and then transmits another message of a predetermined byte indicating the Non-ATM-Based message to the wireless access network.

In addition, the requested call connection checks whether the message transmitted from the switching center is ATM-based by a controller (RNC) of a wireless access network connected to the switching center, and the message transmitted from the switching center according to the check result. Generating a first task if is the ATM-Based message, and generating a second task if the message transmitted from the switching center is the Non-ATM-Based message; and generating the first task or the second task And the controller of the radio access network processes the requested call connection and transmits a message related to the requested call connection to a base station, wherein the base station is ATM-Based of the message transmitted from the controller of the radio access network. Judging whether the message is an ATM-Based message, and generating a first job. If the previous message is a Non-ATM-Based message, generating a second job; and according to the generated first or second job, the base station connects the requested call connection and connects the requested call connection to the terminal. Sending a related message.

Further, the base station connects the requested call connection according to the first job and transmits a message related to the requested call connection to the corresponding terminal or connects the requested call connection according to the second job and the The message related to the requested call connection is converted into bits and transmitted to the corresponding terminal.

1 is a block diagram showing a part of a mobile communication system according to the prior art;

FIG. 2 is a diagram illustrating a connection between a radio access network and an exchange according to whether asynchronous transmission mode is based in the mobile communication system shown in FIG.

3 is a diagram illustrating a connection between a radio access network and an exchange in a mobile communication system according to the present invention.

4 is a flow chart showing message processing of an exchange according to whether or not asynchronous transmission mode is based in the mobile communication system shown in FIG.

FIG. 5 is a flowchart illustrating message processing of a radio network controller depending on whether or not a switching center is based on an asynchronous transmission mode in the mobile communication system shown in FIG.

6 is a flowchart illustrating message processing of a base station according to whether or not a switching center is based on an asynchronous transmission mode in the mobile communication system shown in FIG.

* Description of the symbols for the main parts of the drawings *

300a to 300n: mobile station 310a to 310n: base station

320a-320n: Wireless Network Controller 330: ATM-Based Switching Station

340: Non-ATM-Based Exchange

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

3 is a block diagram illustrating a mobile communication system according to the present invention.

3, in the mobile communication system according to the present invention, the switching center and the RAN are connected to each other regardless of whether the switching center and the RAN are ATM-based. That is, the radio network controllers (RNCs) 320a-320n of all the RANs are connected together to the switching center 330 which is ATM-Based and the switching station 340 which is Non-ATM-Based.

The operation of the mobile communication system connected in this way is first performed through an arbitrary node (ie, Packet Data Gateway Node, PDGN) from a communication network such as an internet network, a packet data network, or the like. When a call connection is requested at 340, the switching center 330 or 340 converts a message to be transmitted to the RNC 320a to 320n into an ATM-based message or a non-ATM-based message according to its ATM-based operation. .

In addition, the exchange stations 330 and 340 constitute another system (not shown) or RAN of a higher stage through a PDGN (not shown) that connects the modified messages as ATM-based messages or Non-ATM-Based messages with them. By transmitting to the lower end of the RNC (320a ~ 320n) or the base station (310a ~ 310n) so that the ATM-Based operation of the switching center (330, 340) can be automatically recognized through the modified messages.

Therefore, in the RAN composed of the RNCs 320a to 320n and the base stations 310a to 310n, the software package is not manually set by the system operator to operate in the same manner depending on whether the switching centers 330 and 340 are ATM-based. Do not. Similarly, even when one RAN and a plurality of switching stations are connected together, in the RAN, the software package is not manually set by the system operator according to whether the switching station has ATM-based operation.

The following describes the message processing operation between the switching center and the RAN when a call connection is requested from any node in the communication system configured as described above.

4 illustrates a case in which one switching station is connected together to an ATM-based RNC and a non-ATM-based RNC in a mobile communication system according to an embodiment of the present invention, or one RNC is an ATM-Based switching station or a non- In the case of simultaneous connection to an ATM-Based Switching Station, this is a flowchart showing message processing between the Switching Station and the RAN when requesting a call connection from any node.

Referring to FIG. 4, when a call connection such as an incoming call is requested from an arbitrary node (S400), the switching center transmits a paging request message to the RNC of the corresponding RAN according to the incoming call.

At this time, the switching center first determines whether the switching center for which the call is requested operates as ATM-Based or Non-ATM-Based (S401). As a result of the determination, when the switching center operates in ATM-Based, the message according to the requested call is transformed into ATM-Based message (S402), and when the RNC operates in Non-ATM-Based, the message according to the requested call is changed. Transform into a Non-ATM-Based Message (S403).

The ATM-based message or the non-ATM-based message is transmitted to the corresponding RNC through an air interface established between the switching center and the RAN (S404 and S405).

In this case, when transmitting an ATM-Based message to the corresponding RNC, the switching station transmits an ATM- by setting the most significant bit (MSB) corresponding to the first parameter of the first message among the transmitted ATM-Basedmessages as '1'. Notify that the operation is based on (S404), in the case of a non-ATM-Based message, the 1-byte message indicating that the non-ATM-Based message is first transmitted to the corresponding RNC to inform that the switching center operates as Non-ATM-Based. (S405).

Then, the RNC receives the ATM-Based message or the Non-ATM-Based message from the switching center, checks the corresponding message, recognizes whether the switching station is ATM-based, and processes the message received from the switching center accordingly (S406).

That is, the RNC processes the call requested by the switching center in the same way according to the ATM-based operation of the switching center.

Thus, the process of processing the message received from the switching center in the RNC according to the ATM-based operation of the switching station is shown in FIG.

FIG. 5 is a flowchart illustrating message processing of a wireless network controller according to whether an switching center performs ATM-based operation in the mobile communication system shown in FIG.

Referring to FIG. 5, the RNC that receives the incoming call message from the switching center determines whether the received message is ATM-based (S500 to S501).

If it is determined that the message received from the switching center is an ATM-based message, an ATM-based task is generated (S502), and if the message is a non-ATM-based message, a non-ATM-based task. To generate (S503).

A task is a generic term for an entity that performs a series of processes to process a requested call connection when one call connection is requested from the RNC.

As such an ATM-based task or a non-ATM-based task is created, the RNC does not need to consider whether the switching center is ATM-based or non-ATM-based until it finishes processing the incoming call.

Subsequently, the message of the incoming call received according to the ATM-Based task is generated as an ATM-Based Format message (S504) or the message of the incoming call received according to the Non-ATM-Based task is generated as a Non-ATM-Based Format message. In operation S505, an ATM-Based-Format message or a Non-ATM-Based Format message generated by the corresponding base station is transmitted (S506).

At this time, the process of processing the messages received from the RNC in the base station is shown in FIG.

Referring to FIG. 6, upon receiving a message from the RNC, the base station determines whether the message is ATM-based (S600 to S601).

As a result of the determination, if the message is ATM-Based, the base station generates an ATM-Based Job (S602), and if the message is Non-ATM-Based, a Non-ATM-Based Job (Sob).

This is the same reason that the RNC created the ATM-Based task so that it is not necessary to consider whether the switching center's ATM-based operation is performed until the incoming call requested by the switching center is completed.

Subsequently, if the received message is an ATM-Based message, the base station transmits the corresponding message to the terminal through a Common Air Interface (CAI) (S605), and if the message is a Non-ATM-Based message, transmits the message to the CAI. The message is converted into a message and transmitted to the terminal (S604).

In general, this is because the base station and the terminal transmit / receive information as bits, so in the case of an ATM-based message that processes information as bits, the base station transmits an ATM-based message to a transparent terminal, and a non-ATM-based. In the case of the message, the base station converts the byte of the Non-ATM-Based message into a bit, generates a CAI message, and transmits the generated CAI message to the terminal in consideration of processing information in byte units.

Subsequent message transmission / reception operations between the terminal and the switching center are performed through the tasks of the radio network controller and the job of the base station already determined in the same process as the conventional message processing, and thus description thereof is omitted.

On the other hand, in the mobile communication system according to the present invention, a method of operating a wireless access network connected to a heterogeneous switching center is performed in the same way as the processing of the incoming call, the RNC, and the base station even when an originating signal is generated from any node. The same applies if the wireless access network of the network is connected to an ATM-based or non-ATM-based exchange.

As described above, according to the present invention, when a heterogeneous wireless access network is connected to one switching station in a mobile communication system or when one radio access network is connected to a heterogeneous switching center, the present invention determines whether the switching center has its own ATM-based service. It automatically informs the end wireless network controller and base station, and the wireless network controller or base station handles incoming / outgoing calls according to the ATM-based operation of the switching center, eliminating the manual software package management of the system operator. It has the effect of easy operation and maintenance.

In addition, by reducing the load of message conversion added to the base station according to the ATM-based operation of the switching center, the wireless network controller can maintain a constant BHCA performance, thereby improving the quality of the communication service provided by the overall mobile communication system.

Claims (4)

1. A method for maintaining busy-time callability performance in a mobile communication system comprising at least one exchange station and a radio access network (RAN) accessing the exchange station, If a call connection is requested from any node, checking whether the Asynchronous Transfer Mode (ATM) of the switching center is based; According to the check result, the switching center converts a type of a message related to the requested call connection and transmits the message to the radio access network; And the wireless access network receiving the converted message processes the requested call connection according to the converted message. The method of claim 1, wherein in the step of transmitting the message, When the switching center operates based on the asynchronous transmission mode, after generating an ATM-Based message and setting the most significant bit of the first parameter of the ATM-Based message, and transmits it to the wireless access network, When the switching center does not operate based on the asynchronous transmission mode, after generating a non-ATM-based message, another message of a predetermined byte indicating that the non-ATM-based message is transmitted to the wireless access network. A method of operating a wireless access network to connect with heterogeneous switching centers in a mobile communication system. The method of claim 1 or 2, wherein processing the requested call connection comprises: Checking whether a message transmitted from the switching center is ATM-based by a controller (RNC) of a wireless access network connected to the switching center; Generating a first task if the message transmitted from the switching center is the ATM-Based message according to the check result, and generating a second task if the message transmitted from the switching center is the non-ATM-based message; , The controller of the radio access network according to the generated first task or the second task to process the requested call connection and send a message related to the requested call connection to a base station; Determining, by the base station, whether the message transmitted from the controller of the wireless access network is ATM-based; Generating a first job if the message is an ATM-Based message and generating a second job if the message is a Non-ATM-Based message according to the determination result; The base station connects the requested call connection and transmits a message related to the requested call connection to the terminal according to the generated first job or the second job. Operating method of a wireless access network connected to. The method of claim 3, wherein in the step of transmitting a message to the corresponding terminal, The base station connects the requested call connection according to the first job and sends a message related to the requested call connection to the corresponding terminal or connects the requested call connection according to the second job and the requested And converting a message related to a call connection in units of bits and transmitting the message to the corresponding terminal, wherein the wireless access network is connected to a heterogeneous switching station in a mobile communication system.