KR100784642B1 - System for improving silent phenomenon generated in asynchronization-synchronization hand over and method therefor - Google Patents

Abstract

A system for improving silent phenomenon occurring during asynchronous-synchronous handover and a method are provided to add a registration process to a CDMA(Code Division Multiple Access) mobile phone MSC(Mobile Switching Center) during a process of handing over to a CDMA network from a WCDMA(Wideband CDMA) network, thereby improving the mute state by perceiving a resource occupancy state of a base station controller and a CDMA MSC. Once asynchronous-synchronous handover generation conditions are satisfied, an asynchronous RAN(Radio Access Network)(10) sends a handover request message. If the handover request message arrives, an asynchronous MSC(20) sends a handoff direct message to a synchronous MSC(30). If the handoff direct message arrives, the synchronous MSC(30) registers the message, transmits the results to the asynchronous MSC(20), and transmits a handoff request message to a synchronous BS(Base Station)(40). The synchronous BS(40) transmits a response message for the handoff request message to the synchronous MSC(30).

Description

SYSTEM AND IMPROVING SILENT PHENOMENON GENERATED IN ASYNCHRONIZATION-SYNCHRONIZATION HAND OVER AND METHOD THEREFOR}

FIG. 1 is a diagram briefly showing a system for improving silence caused during asynchronous-synchronous handover.

FIG. 2 is a diagram illustrating a method of improving silence caused by asynchronous-synchronous handover according to a signal flow.

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

10: synchronous RAN 20: asynchronous MSC

30: synchronous MSC 40: synchronous base station

The present invention relates to a system and a method for improving the silence occurring during asynchronous-synchronous handover. The present invention relates to a CDMA mobile switching center following a handoff instruction message (FacilitesDirective2) during handover from WCDMA to CDMA. In addition, the present invention relates to a system and a method for improving the silent phenomenon occurring during asynchronous-synchronous handover, which can improve the silent phenomenon by grasping the resource occupancy state of the CDMA MSC and the BSC.

Recently, due to the rapid development of mobile communication technology, mobile communication systems are continuously being upgraded, and there are cases where a system different from the existing technology is used.

However, since the installation of a new system requires a great deal of time and money, a technology that can be used in combination with an existing system is being developed.

For example, the interworking of the conventional 2G-based mobile communication system and the 2.5G-based mobile communication system has been implemented, and recently, the interworking of the 2.5G-based mobile communication system and the 3G-based mobile communication system has also been implemented.

However, in accordance with this difference in the underlying technology, the intermittent silence occurs when moving from the WCDMA system 3G to the CDMA system 2.5 in the same way as the intermittent silence occurs during the handover from the 2.5G system of the CDMA system to the 2G system. There is a problem.

However, during the asynchronous-synchronous handover (meaning a hard handover that occurs when originating from the WCDMA coverage area and moving to the CDMA coverage area on the call), the terminal immediately proceeds to the registration process with the synchronous MSC. Since there is no registration information in the synchronous MSC because it cannot be executed, there is a problem that accurate cause analysis is difficult when silence occurs during asynchronous-synchronous handover.

In order to solve the above problems, the present invention adds a process of registering a message to the CDMA mobile switching center in the process of handover from WCDMA to CDMA, followed by FacilitiesDirective2 message, thereby occupying the resources of the CDMA MSC and the BSC. It is an object of the present invention to provide a system and a method for improving the silent phenomenon occurring during asynchronous-synchronous handover that can improve the silent phenomenon by understanding the state.

In order to achieve the above objects, a system for improving the silence caused during asynchronous-synchronous handover according to an aspect of the present invention,

An asynchronous Radio Access Network (RAN) for sending a handover request message (Relocation Required) if an asynchronous-synchronous handover occurrence condition is satisfied;

An asynchronous MSC for sending a handoff indication message FacilitesDirective2 to a synchronous MSC when the handover request message arrives;

A synchronous MSC which registers when the handoff indication message arrives from the asynchronous MSC, transmits the result to the asynchronous MSC, and transmits a handoff request message to a corresponding base station (BS); And

When the handoff request message is received from the synchronous MSC, it characterized in that it comprises a synchronous base station for transmitting a response message (Handoff Request Ack) to the synchronous MSC.

According to another aspect of the present invention, there is provided a method for improving silence caused by asynchronous-synchronous handover.

In the method of improving the silence occurring during asynchronous-synchronous handover,

A first step of sending a handover request message (IU Relocation Required) to an asynchronous MSC in an asynchronous Radio Access Network (RAN) if an asynchronous-synchronous handover occurrence condition is satisfied;

Transmitting a handoff indication message FacilitesDirective2 to a synchronous MSC when the handover request message is received by the asynchronous MSC;

A third step of registering the handoff indication message FacilitesDirective2 when it is received by the synchronous MSC and transmitting the result to the asynchronous MSC;

A fourth step of transmitting a handoff request message (handoff requeset) from the synchronous MSC to a corresponding base station (BS) when registration is completed in the third step;

A fifth step of transmitting a handoff request acknowledgment message to the synchronous MSC as the handoff request message is received;

Transmitting a confirmation message according to the handoff indication message FacilitesDirective2 to an asynchronous MSC when the handoff request acknowledgment message is received by the synchronous MSC; And

And a seventh step of transmitting an IU Relocation Command message to the asynchronous RAN when the confirmation message is received.

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

Referring to Figure 1 describes the configuration of a system for improving the silent phenomenon occurring during asynchronous-synchronous handover according to an embodiment of the present invention, Figure 1 is a system for improving the silent phenomenon occurring during asynchronous-synchronous handover It is a figure which shows briefly.

A CDMA mobile communication system called a second generation or 2.5 generation network is called a synchronous mobile communication system, and a WCDMA mobile communication system called a third generation network is called an asynchronous mobile communication system.

The system for improving the silence occurring during asynchronous-synchronous handover according to an embodiment of the present invention includes an asynchronous RAN 10, an asynchronous MSC 20, a synchronous MSC 30, a synchronous base station 40, and data management. Center (DMC) (not shown), DEC (not shown) and DCC (not shown).
Here, DEC is an abbreviation of Data Element Controller, and it is a S / W block in 1X base station channel card, and encodes or decodes CDMA information into analog information. In addition, DCC is an abbreviation of Data Call Controller. The / W block acts as the overall call management.

The asynchronous RAN (Radio Access Network) 10 means a base station and a control station in asynchronous, and if a condition for generating an asynchronous-synchronous handover is satisfied, a handover request message (Relocation Required) is transmitted to the asynchronous MSC 20. .

When the handover request message (Relocation Required) is received from the asynchronous RAN 10, the asynchronous MSC 20 transmits a handoff indication message FacilitesDirective2 to the synchronous MSC 30.

At this time, the handoff indication message FacilitesDirective2 indicates a MAP message including a handover request message from an asynchronous MSC in service to a synchronous MSC during asynchronous-synchronous handover.

The synchronous MSC 30 registers when a handoff instruction message FacilitesDirective2 arrives from the asynchronous MSC 20, transmits the result to the asynchronous MSC 20, and sends the hand to the corresponding synchronous base station (BS) 40. Send a handoff requeset message.

When a handoff request message is received from the synchronous MSC 30, the synchronous base station (BS) 40 transmits null forward traffic channel frames to the asynchronous terminal through the omnidirectional traffic channel, and handoffs it. A handoff request ack is sent to the synchronous MSC.

When the data management center (DMC) receives the handoff request message from the synchronous base station 40, the data management center performs packetization to transmit a configuration response message to the DEC, and the DMC performs packetization. Pass the ConfigurationRequest message to the DEC.

In addition, when the DMC is notified that the reverse traffic channel has been received from the DEC, the DMC performs depacketizing and transmits a ConfigurationComplete message to the DCC.

The DEC transmits a ConfigurationRequest message to a forward traffic channel and, upon receiving a ConfigurationResponse message from a data management center (DMC), transmits the configuration request message to a forward traffic channel.

The DEC also notifies the DMC that it has received a message on a reverse traffic channel.

The DCC sends a ConfigurationRequest message to the DEC, and the AT sends a ConfigurationResponse message for the ConfigurationRequest message to the reverse traffic channel.

At this time, the functions of the DMC, DEC, and DCC are repeatedly executed for each protocol.

Hereinafter, with reference to Figure 2 describes a method for improving the silent phenomenon occurring during asynchronous-synchronous handover according to an embodiment of the present invention, Figure 2 is a method for improving the silent phenomenon occurring during asynchronous-synchronous handover Is expressed according to the signal flow.

A method of improving the silence occurring during asynchronous-synchronous handover according to an embodiment of the present invention shown in FIG. 2 is as follows.

If the condition for generating an asynchronous-synchronous handover is satisfied, a handover message (IU Relocation Required) is sent to the asynchronous MSC in the asynchronous radio access network (RAN) (S210).

When the handover message is received by the asynchronous MSC in operation 210 (S210), the handoff instruction message FacilitesDirective2 is transmitted to the synchronous MSC (S220).

At this time, the handoff indication message FacilitesDirective2 is a MAP message including a handover request message from an asynchronous MSC in service to a synchronous MSC during asynchronous-synchronous handover.

If the handoff instruction message FacilitesDirective2 is received in the synchronous MSC in operation 220 (S220), it is registered and the result is transmitted to the asynchronous MSC (S230).

At this time, if mute occurs during handover from asynchronous to synchronous, the MSC and the base station control station (BSC) occupy the resources occupied based on the message registered in step 230 (S230) and the cause of mute loopback ( Loopback) test to improve.

When registration is completed in step 230 (S230), the handoff request (handoff requeset) message is transmitted to the corresponding base station (BS) in the synchronous MSC (S240).

When the handoff request message is received in operation 240 (S240), a handoff request acknowledgment message is transmitted to the synchronous MSC (S250).

If a handoff request ack message is received in the synchronous MSC in operation 250 (S250), an acknowledgment message (ack) for the handoff indication message FacilitesDirective2 is transmitted to the asynchronous MSC (S260).

When an acknowledgment message (ack) for the handoff instruction message FacilitesDirective2 is received in operation 260 (S260), an IU Relocation Command message is transmitted to the asynchronous RAN (S270).

When the IU Relocation Command message is received in the asynchronous RAN in step 270, the handover message is transmitted to the asynchronous terminal in step S280.

When the handover message is received in the asynchronous terminal in step 280 (S290), the channel assignment message is transmitted (S290).

When the channel assignment message is received in operation 290 (S290), a reverse traffic channel frame or traffic channel preamble is transmitted to the base station, and a handoff completion message is transmitted to the base station (S300).

When a handoff completion message is received at the base station in step 300, the base station transmits a BS ack order message to connect a call with the asynchronous terminal (S310).

When the call is connected to the asynchronous terminal in step 310, the base station transmits a handoff completion message to the synchronous MSC (S320).

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive.

As described above, the present invention adds the registration process to the synchronous MSC after the FacilitiesDirective2 message in the process of handover from asynchronous to synchronous to identify the resource occupancy status of the synchronous MSC and the base station control station (BSC) to improve silence. can do.

In addition, the cause of silence can be analyzed by a loopback test to improve silence easily and accurately.

Claims (13)

In a system that improves the silence that occurs during asynchronous-synchronous handover, An asynchronous Radio Access Network (RAN) for sending a handover request message (Relocation Required) if an asynchronous-synchronous handover occurrence condition is satisfied; An asynchronous MSC for sending a handoff indication message FacilitesDirective2 to a synchronous MSC when the handover request message arrives; A synchronous MSC which registers when the handoff indication message arrives from the asynchronous MSC, transmits the result to the asynchronous MSC, and transmits a handoff request message to a corresponding synchronous base station (BS); And Mute that occurs during asynchronous-synchronous handover, comprising: a synchronous base station for transmitting a handoff request message to the synchronous MSC when a handoff request message is received from the synchronous MSC System to improve the phenomenon. The method of claim 1, A data management center (DMC) for performing packetization when the handoff request message is received by the synchronous base station and transmitting a configuration response message to a data element controller (DEC); And a DEC for transmitting a configuration response message from the data management center to a forward traffic channel. 12. The system of claim 1, further comprising a DEC. The method of claim 2, The DEC notifies the DMC that it has received a message on a reverse channel, and the DMC performs depacketizing to deliver a ConfigurationComplete message to a Data Call Controller (DCC). A system that improves silence caused by asynchronous-synchronous handovers. The method of claim 3, The DCC delivers a ConfigurationRequest message to the DEC, the DMC performs packetizing to deliver a ConfigurationRequest message to the DEC, and the DEC forwards a ConfigurationRequest message to the DEC. The AT transmits a ConfigurationResponse message to the reverse channel, and the DEC sends a ConfigurationResponse message to the reverse channel. In response to the DMC, the DMC performs depacketizing to deliver a ConfigurationResponse message to the DCC. System. The method according to claim 3 or 4, And said forward or reverse channel is a traffic channel. The method of claim 5, The system for improving the silent phenomenon occurring during asynchronous-synchronous handover, characterized in that the functions of the DCC, DMC and DEC are repeatedly executed for each protocol. In the method of improving the silence occurring during asynchronous-synchronous handover, A first step of sending a handover request message (IU Relocation Required) to an asynchronous MSC in an asynchronous Radio Access Network (RAN) if an asynchronous-synchronous handover occurrence condition is satisfied; Transmitting a handoff indication message FacilitesDirective2 to a synchronous MSC when the handover request message is received by the asynchronous MSC; A third step of registering the handoff indication message FacilitesDirective2 when it is received by the synchronous MSC and transmitting the result to the asynchronous MSC; A fourth step of transmitting a handoff request message (handoff requeset) from the synchronous MSC to the corresponding synchronous base station (BS) when registration is completed in the third step; A fifth step of transmitting, by the sync base station (BS) received by the handoff request message, a handoff request acknowledgment message to the synchronous MSC; Transmitting a confirmation message according to the handoff indication message FacilitesDirective2 to an asynchronous MSC when the handoff request acknowledgment message is received by the synchronous MSC; And And a seventh step of transmitting an IU Relocation Command message to the asynchronous RAN when the confirmation message according to the handoff indication message FacilitesDirective2 is received. Way. The method of claim 7, wherein An eighth step of transmitting a handover message to the asynchronous terminal when the IU Relocation Command message is received in the asynchronous RAN in the seventh step; A ninth step of transmitting a channel assignment message when the handover message is received at the asynchronous terminal in the eighth step; A tenth step of transmitting a reverse channel frame or channel preamble to the base station and transmitting a handoff completion message to the base station when the channel assignment message is received in the ninth step; An eleventh step of connecting a call with an asynchronous terminal by transmitting a BS ack order message when a handoff completion message is received at the base station in step 10; And And a 12 th step of transmitting a handoff complete message to the synchronous MSC by the base station when the call is connected with the asynchronous terminal in the eleventh step. . The method of claim 8, The reverse channel frame is a reverse traffic channel frame, And the channel preamble is a traffic channel preamble. The method according to any one of claims 7 to 9, The handoff indication message FacilitesDirective2 is a MAP message including a handover request message from an asynchronous MSC in service to a synchronous MSC during asynchronous-synchronous handover. How to. In the method of improving the silence occurring during asynchronous-synchronous handover, A first step of sending a handover request message (IU Relocation Required message) to an asynchronous MSC in an asynchronous Radio Access Network (RAN); Transmitting a handoff request message FacilitesDirective2 to a synchronous MSC when the handover request message is received by the asynchronous MSC; Registering the handoff request message (FacilitesDirective2) when it is received at the synchronous MSC and transmitting the result to the asynchronous MSC; When the registration is completed in the third step, a fourth step of transmitting a handoff request (handoff requeset) message from the synchronous MSC to the corresponding base station (BS) which occurs during asynchronous-synchronous handover How to improve silence. The method of claim 11, In the third step, if a message is registered in the synchronous MSC and muting occurs during asynchronous to synchronous handover, the resource occupied by the synchronous MSC and the BSC (base international language station) is identified based on the registered message. The method of claim 1, further comprising the step of: Silencing occurring during asynchronous-synchronous handover. The method according to claim 11 or 12, wherein And performing a loopback test when the mute is generated.

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