KR100727769B1 - Serving MSC determination Apparatus And Method In The Converged Service System Of Unlicensed Radio Network And CDMA Mobile Communication Network - Google Patents

Abstract

The present invention can avoid handoff between mobile switching center (MSC) during handoff processing between mobile communication network and unlicensed wireless network (Wi-Fi / Bluetooth) in unlicensed wireless network and CDMA mobile communication network convergence service system. An apparatus and method for determining a serving MSC in an unlicensed wireless network and a CDMA mobile communication network converged service system.

The present invention relates to a combination of an unlicensed wireless network and a mobile communication network in a converged service system in which a UNC of an unlicensed wireless network is connected to a plurality of MSCs, and a dual-mode MS performs a procedure of registering with an UNC of an unlicensed wireless network. The UNC determines the serving MSC using the last cell information of the mobile communication network or the currently accessed WLAN AP identification information, thereby avoiding the handoff between MSCs differently when handoff between the mobile communication network and the unauthorized wireless network. It becomes possible.

In addition, the present invention determines a serving MSC based on the mobile communication network cell information that the dual mode MS last connected in the UNC of the unlicensed wireless network or the currently connected WLAN AP identification information to handoff between the mobile communication network and the unlicensed wireless network. By avoiding handoff between MSCs, not only the overall handoff processing speed can be improved, but also the network resources can be saved, and further, the possibility of handoff failure due to a lack of network resources can be significantly improved.

Unlicensed wireless network, CDMA mobile communication network, converged service system, UNC, dual mode MS, serving MSC, mobile communication network cell information, WLAN AP identification information, handoff

Description

Serving MSC determination Apparatus And Method In The Converged Service System Of Unlicensed Radio Network And CDMA Mobile Communication Network}

1 is a network diagram illustrating a connection state between UNC and MSC in a conventional unlicensed wireless network and a CDMA mobile communication network converged service system.

2 to 4 are diagrams for explaining a process in which the inter-MSC handoff occurs when a dual-mode MS moves from a CDMA mobile communication network to an unauthorized wireless network in the conventional converged service system.

5 is a diagram illustrating a connection state between UNC and MSC in an unlicensed wireless network and a CDMA mobile communication network converged service system according to the present invention;

6 is a diagram illustrating a method of determining a serving MSC in an unlicensed wireless network and a CDMA mobile communication network convergence service system according to the present invention.

7 to 9 are diagrams for explaining a process of avoiding inter-MSC handoff when a dual mode MS moves from a CDMA mobile communication network to an unlicensed wireless network in the converged service system according to the present invention.

Explanation of symbols on the main parts of the drawings

71, 72: Dual mode MS 81, 82: BTS

83: BSC 85, 86: Wireless LAN AP

87: UNC 91, 92: MSC

The present invention relates to an unlicensed wireless network and a CDMA mobile communication network convergence service system, and in particular, a hand-over between a mobile switching center (MSC) during handoff processing between a CDMA-based mobile communication network and an unlicensed wireless network (Wi-Fi / Bluetooth). An apparatus and method for determining a serving MSC in an unlicensed wireless network and a CDMA mobile communication network converged service system enabling to avoid an off.

Conventional unlicensed wireless network (Wi-Fi / Bluetooth) and GSM or UMTS mobile communication network or CDMA mobile communication network are overlapped with each other and unlicensed wireless network is rapidly spreading due to relatively high service speed and low service cost. On the other hand, there is a disadvantage of providing a narrow service area and low mobility, while the GSM or UMTS mobile communication network or CDMA mobile communication network has a low service speed and high cost, but supports a wide service area and high mobility.

For this reason, the recent development of a dual mode mobile station (dual mode mobile station) capable of connecting to both an unauthorized wireless network and a GSM / UMTS mobile communication network has also been developed. We developed the UMA (Unlicensed Mobile Access) technology, which is a convergence technology that enables interoperability.

However, the conventional UMA technology is applicable only to a GSM / UMTS-based mobile communication network. In the case of a CDMA-based mobile communication network, a base station transceiver (BTS) and a base station associated with a GSM / UMTS mobile communication network and a radio resource control layer and Since the operation process and communication protocol of Mobile Switching Center (MSC) are different, call processing method, protocol and handoff processing between dual mode MS and UMA Network Controller (UNC) is based on existing GSM-based UMA standard. Since it is different from the above, there was a problem that the above-mentioned UMA federation standard and technical matters cannot be applied as it is.

Accordingly, the applicant of the present invention provides an unlicensed wireless network and a CDMA mobile communication network providing a system and a processing method for combining and interworking a UMA technology that can operate in a CDMA-based mobile communication network, that is, an unlicensed wireless network and a CDMA mobile communication network. Convergence service system and method (Domestic Application No. 10-2005-86862) have been proposed, and BSC (Base of mobile communication network) can be used without interruption even if access network is changed between mobile communication network and unauthorized wireless network. Station Controller) and UNC have proposed a call processing and handoff processing method in the unlicensed wireless network and CDMA mobile communication network converged service system that enables handoff processing through MSC (Domestic Application No. 10-2005-86863). .

On the other hand, in the conventional CDMA mobile communication network, the relationship between the MSC, the BSC, and the BTS has a hierarchical configuration in which a plurality of BSCs are connected to one MSC, and a plurality of BTSs are connected to each BSC. Since all BSCs under the control of one service area or one MSC are predetermined according to the geographical location, even if a handoff between BSCs is performed by the movement of the MS, in most cases, the MSs are solved within the same MSC. When the MSC moves from the boundary of the service area governed by the source MSC to the service area governed by the target MSC, an inter-MSC handoff occurs. In general, the service area (cell area) managed by the MSC is moved, for example, because it is large enough to cover a large city or more. Inter-MSC handoff is not frequently performed during communication service.

However, in the aforementioned unlicensed wireless network and the CDMA mobile communication network converged service system, the unlicensed wireless network composed of the WLAN AP and the IP delivery network, unlike the conventional mobile communication network, does not determine the control system, that is, UNC, according to the geographical location. The dual mode MS is provided with mobile communication service through an unlicensed wireless network while performing IP communication with a corresponding UNC through an IP delivery network regardless of the geographical location of the accessing AP. When the handoff to the mobile communication network may be out of the geographic location managed by the serving MSC (Serving MSC).

That is, in the above-described UMA technology, unlike a conventional mobile communication network, the wireless LAN AP connected to the dual mode MS, the UNC connected through the IP delivery network, and the MSC controlling the UNC operate regardless of the geographical location. Therefore, any dual-mode MS can communicate with the UNC through the IP transport network regardless of the location of the WLAN AP. As a result, the service area of the unlicensed wireless network managed by one UNC is configured regardless of the geographical location. do.

In addition, in the aforementioned UMA technology, the UNC plays the same role as the BSC of the mobile communication network. Therefore, the UNC operates in connection with one specific MSC. However, in the mobile communication network, the service area managed by the BSC and the BTS is geographically determined. In addition, the serving MSC to which the dual mode MS is connected through an unlicensed wireless network (Wireless AP-IP delivery network-UNC) may be different from the MSC that is determined by the geographical location in the past, and may be different from the MSC that manages the adjacent service area. have.

For example, as illustrated in FIG. 1, the UNC of the unlicensed wireless network communicates with a dual-mode MS connected through all WLAN APs from the first WLAN AP to the ninth WLAN AP through an IP delivery network. In the mobile communication network, the first BSC is connected to the dual mode MS via the first BTS A and the first BTS B, the second BSC is connected to the dual mode MS via the second BTS A and the second BTS B, and the third BSC is connected to the third BTS A. Each BTS communicates with a dual-mode MS connected through each other. Each BTS has a geographic location determined by a cell plan, but each WLAN AP is connected regardless of the geographic location.

In this case, the first BSC and the second BSC are connected to the first MSC, and the third BSC and the UNC are connected to the second MSC. That is, the first MSC manages the service areas of the first BTS A, the first BTS B, the second BTS A, and the second BTS B, and the second MSC is configured to manage the service areas of the third BTS A, and in this situation, the first dual In the case of a mode MS, the first MSC becomes a serving MSC when accessing the mobile communication network through the second BTS B, and in the case of a second dual mode MS, the first MSC becomes a serving MSC. The second MSC becomes the serving MSC both when accessing the mobile communication network through 3BTS A and when accessing the unauthorized wireless network through the 8th WLAN AP.

In the conventional unlicensed wireless network and CDMA mobile communication network convergence service system, the serving MSC may be different when the dual-mode MS in the same area is connected to the unlicensed wireless network and when accessing the mobile communication network. Since handoffs occur frequently between unlicensed wireless networks, in a conventional converged service system, handoffs between MSCs involving different MSCs frequently occur. Such inter-MSC handoffs occur between two MSCs (source MAC and target MSC). The signaling message for the handoff has to be exchanged, and there is a problem in that network resources are wasted because the voice channel is connected between the source MSC and the target MSC until the call of the dual mode MS is terminated.

For example, as shown in FIG. 2, a second BTS 22 connected to a BSC 23 in which any dual mode MS, that is, the first dual mode MS 11 uses the first MSC 31 as the serving MSC, may be used. If it is assumed that the voice call service is used, the call counterpart of the first dual mode MS 11 is connected through the first MSC 31. And, it is assumed that the service area of the first WLAN AP 25 belonging to the unlicensed wireless network is within the service area of the second BTS 22.

In the service area of the second BTS 22, when the first dual mode MS 11 in the voice call moves to the service area of the first WLAN AP 25 as shown in FIG. 3, the first dual mode The MS 11 detects that the MS 11 has moved to the service area of the first WLAN AP 25, performs a wireless LAN connection to the corresponding first WLAN AP 25, and performs an unlicensed wireless connection through the first WLAN AP 25. After accessing the network and performing the registration procedure with the designated UNC 27, the handoff procedure between the BSC 23 and the UNC 27 is performed.

At this time, since the UNC 27 is connected to the second MSC 32, in order to perform a handoff between the BSC 23 and the UNC 27, the MSC 31 between the first MSC 31 and the second MSC 32 participates. Handoff must be performed, and signaling message exchange and voice channel connection are performed between the first MSC 31 and the second MSC 32 in this handoff process.

Subsequently, when the handoff from the mobile communication network to the unlicensed wireless network is completed according to a series of handoff processes, the call path of the first dual mode MS 11 is shown in FIG. 11) is connected to the UNC 27 of the unlicensed wireless network via the first MSC 31 of the connected mobile communication network via the second MSC 32.

Therefore, in the above-mentioned unlicensed wireless network and CDMA mobile communication network converged service system, since the UNC of the unlicensed wireless network is connected to one specific MSC in the same manner as the BSC of the mobile communication network, the wireless LAN of the region beyond the service area of the corresponding MSC In case of dual mode MS connected with AP and UNC, MSC connected with BSC of mobile communication network which includes the area as service area and MSC connected with UNC may be different from each other. Since handoff occurs between MSCs during handoff, handoff processing is delayed due to exchange of signaling messages for handoff processing between the MSCs, and voice channel transfer between MSCs until the call of the dual mode MS is terminated. Network resources are wasted because it has to be continued, and handoff between MSCs is performed between two different MSCs. If sex because channels must be kept high resource usage of the MSC had a problem likely to fail handoff itself.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a dual-mode MS by connecting UNCs of unlicensed wireless networks with a plurality of MSCs in a converged service system for combining and interworking with an unlicensed wireless network and a mobile communication network. When performing the procedure of registering to UNC of unlicensed wireless network, UNC can determine serving MSC based on geographical location by using mobile network cell information which dual mode MS last accessed or identification of currently connected WLAN AP. have.

Another object of the present invention is to determine a serving MSC to be used by a dual-mode MS when performing a registration procedure of a dual-mode MS in an UNC of an unlicensed wireless network, thereby avoiding inter-MSC handoff during handoff between a mobile communication network and an unlicensed wireless network. To make it possible.

It is another object of the present invention to improve overall handoff processing speed and network resources by avoiding inter-MSC handoff when handoff between mobile communication network and unlicensed wireless network in unlicensed wireless network and mobile network converged service system. To save.

A feature of the present invention for solving the above object is, in a converged service system for combining and interworking with an unlicensed wireless network and a CDMA mobile communication network, a WLAN signal transmitted from a WLAN AP of the unlicensed wireless network is A dual mode MS for reporting the mobile communication network cell information and / or the currently connected WLAN AP identification information while performing a procedure of accessing and registering an unlicensed wireless network through the WLAN AP if detected; A network controller of an unlicensed wireless network that is connected to a plurality of MSCs and communicates with a WLAN AP through an IP delivery network, and is based on a geographical location using mobile network cell information or WLAN AP identification information reported from the dual-mode MS. The present invention provides a device for determining a serving MS in an unlicensed wireless network including a UNC for determining a serving MSC of the dual mode MS and a mobile communication network.

In this case, the plurality of MSCs connected to the UNC may be MSCs including a region in which each WLAN AP communicating with the UNC via an IP delivery network is installed as a service area.

The UNC determines the serving MSC by using the mobile communication network cell information or the WLAN AP identification information reported from the dual mode MS. If only the WLAN AP identification information is reported from the dual mode MS, the UNC is pre-registered. The MSC information table corresponding to the WLAN AP identification information is searched to determine the serving MSC of the dual mode MS, and when the mobile cell information is reported from the dual mode MS, The MSC information table is searched to determine the serving MSC of the dual mode MS.

At this time, the mobile communication network cell information is characterized in that the BTS identification information of the CDMA mobile communication network that the dual mode MS was last connected.

In addition, the UNC determines the serving MSC of the dual mode MS in consideration of the overall call processing load distribution when the dual mode MS registration procedure is performed through the WLAN AP located outside the service area of the mobile communication network, or the dual Determining a serving MSC by using the mobile cell network information that the mode MS last connected, or by registering the serving MSC according to the geographic location of the WLAN AP in advance and increasing the mode MS to the dual mode MS connected to the WLAN AP. It is characterized in that the registered MSC is determined as the serving MSC.

Another feature of the present invention is a process of performing a WLAN access to the WLAN AP when a dual mode MS capable of accessing both an unlicensed wireless network and a CDMA mobile communication network detects a WLAN signal transmitted from an arbitrary WLAN AP. and; During the procedure of performing IP communication through the WLAN AP to register with the UNC of the unlicensed wireless network, the dual mode MS cell information and the identification information of the currently connected WLAN AP are accessed. Reporting to the UNC; Unlicensed wireless network and CD including the step of determining the serving MSC of the dual-mode MS by searching the MSC information table registered in the UNC using the mobile communication network cell information or the WLAN AP identification information reported from the dual-mode MS The present invention is to implement a method for determining MS in mobile communication network convergence service system.

Here, the process of reporting the mobile communication network cell information and / or identification information of the currently connected WLAN AP to the UNC in the dual mode MS is a dual mode in which the dual mode MS first connects to an unauthorized wireless network when the power is turned on. In the case of the mode MS, since there is no mobile communication network cell information last accessed, only the identification information of the currently connected WLAN AP is reported to the UNC.

The determining of the serving MSC of the dual mode MS may include: checking whether there is mobile communication network cell information among information reported from the dual mode MS; If there is mobile cell information, the MSC information table corresponding to the previously registered mobile communication cell information is searched using BTS identification information, which is the mobile communication cell information reported from the dual mode MS, to search for the serving MSC of the dual mode MS. Determining; If there is no mobile communication cell information, the serving MSC of the dual mode MS is determined by searching the MSC information table corresponding to the registered WLAN AP identification information using the WLAN AP identification information reported from the dual mode MS. Characterized in that it comprises a step.

The determining of the serving MSC of the dual mode MS may include determining that the WLAN AP is located outside the service area of the CDMA mobile communication network as a result of analyzing the WLAN AP identification information reported from the dual mode MS. The serving MSC of the dual mode MS is determined in consideration of the processing load distribution, or the serving MSC of the dual mode MS is determined using the mobile communication network cell information that the dual mode MS was last connected to, or the WLAN AP By registering the serving MSC according to the geographic location in advance, it is characterized in that the pre-registered MSC for all the dual-mode MS connected to the WLAN AP as the serving MSC.

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

The present invention implements a UMA technology that can operate in a CDMA-based mobile communication network, that is, a UMA technology for combining and interworking with an unlicensed wireless network (Wi-Fi / Bluetooth) and a CDMA mobile communication network. Unlike the BSC of the mobile communication network which is connected only to a specific MSC for the UNC of the unlicensed wireless network that communicates with the LAN AP, the mobile network cell information obtained from the dual-mode MS connected to a plurality of MSCs and the UNC connected to the unlicensed wireless network, or the present By determining the serving MSC of the dual-mode MS based on the access point AP identification information to access the handoff between the MSC when the handoff between the mobile communication network and the unlicensed wireless network, such a MSC determination method is implemented The unlicensed wireless network and the CDMA mobile communication network convergence service system have the configuration as shown in FIG. 5.

That is, an unlicensed wireless network and a CDMA mobile communication network convergence service system in which a UNC serving MSC determination method according to the present invention is implemented, as illustrated in FIG. 5, may include a plurality of BTSs and BSCs connected through a CDMA transport network and an IP transport network. A plurality of WLAN APs and UNCs connected through a plurality of MSCs of a CDMA core network that interoperate with a BDMA of a CDMA mobile communication network and an UNC of an unauthorized wireless network are provided. Depending on the location, it is only connected to a specific MSC, but the UNC of an unlicensed wireless network has a structure that is connected to a plurality of MSCs. For reference, FIG. 5 illustrates a case where an UNC of an unlicensed wireless network is connected to two MSCs, but this may be changed according to the configuration of a converged service system.

In the present invention, in connecting the UNC of the unlicensed wireless network communicating with each WLAN AP through the IP delivery network to a plurality of MSCs, each WLAN communicating through the UNC itself and the IP delivery network to avoid handoff between MSCs. MSCs that are geographically adjacent to the AP, that is, the area where each WLAN AP is installed, are connected to the MSCs including the service area.

In such an unlicensed wireless network and a CDMA mobile communication network convergence service system, the UNC of the unlicensed wireless network is finally received from the dual-mode MS connected to the corresponding WLAN AP when the registration procedure of the dual-mode MS is performed through its lower WLAN AP. After acquiring the connected mobile communication network cell information (e.g., BTS identification information) and / or identification information (e.g., MAC address) of the currently connected WLAN AP, the obtained mobile communication network cell information or the WLAN AP identification information is used. Search the MSC information table corresponding to the mobile communication network cell information registered in advance or the MSC information table corresponding to the WLAN AP identification information, and determine the serving MSC as the serving MSC that manages the area where the dual mode MS is located. In the handoff process between the communication network and the unauthorized wireless network, a handoff procedure is performed through the serving MSC.

In addition, in the present invention, when a dual mode MS registration procedure is performed through a WLAN AP located outside a service area of a CDMA mobile communication network, that is, a WLAN reported from a dual mode MS currently performing a registration procedure in a UNC of an unlicensed wireless network. As a result of analyzing the AP identification information, if the WLAN AP is found to be located outside the service area of the CDMA mobile communication network, the UNC of the unlicensed wireless network determines the serving MSC in consideration of the overall call processing load distribution or requests the registration of the dual mode MS. Determines the serving MSC by using the information of the mobile communication network which was finally accessed, or registers the serving MSC according to the geographical location of the WLAN AP located outside the service area of the CDMA mobile communication network in advance and accesses the corresponding WLAN AP. For a mode MS, a specific MSC can be determined as the serving MSC.

In addition, when the dual mode MS detects a WLAN signal transmitted from a wireless LAN AP of an unlicensed wireless network, the dual mode MS performs a procedure of accessing the unlicensed wireless network through the wireless LAN AP and registering with the UNC. The mobile communication network cell information and the identification information of the currently connected WLAN AP are reported to the UNC through the WLAN AP and the IP delivery network.

For example, in FIG. 5, the UNC communicates with a dual-mode MS connected through all WLAN APs from the first WLAN AP to the ninth WLAN AP through an IP delivery network, and the first BSC communicates with the first BTS A and the first BTS B. The second BSC communicates with the dual mode MS connected through the second BTS A and the second BTS B, and the third BSC communicates with the dual mode MS connected through the third BTS A. Each BTS has a geographic location determined by a cell plan, but WLAN APs are connected regardless of the geographic location. In this case, the first BSC and the second BSC are connected to the first MSC, the third BSC is connected to the second MSC, and the UNC is connected to the first WLAN AP through the fifth WLAN AP installed in the service area of the first MSC, It is connected to both the first MSC and the second MSC to handle both access through the seventh WLAN AP and the eighth WLAN AP installed in the service area of the second MSC.

In addition, from the CDMA core network side, the first MSC manages the service areas of the first BTS A, the first BTS B, the second BTS A, and the second BTS B, and the second MSC manages the service areas of the third BTS A, and in this structure, When the first dual mode MS accesses the mobile communication network through the second BTS B, the first MSC connected to the second BSC through the second BTS B is selected as the serving MSC, and when the fifth MS accesses the unauthorized wireless network through the fifth WLAN AP, Since the first MSC connected to the UNC through the WLAN AP is selected as the serving MSC, the mobile communication network and the unlicensed wireless network have the same serving MSC.

In the present invention, when there is a WLAN AP between two adjacent BTSs (second BTS B and third BTS A), such as the sixth WLAN AP, the dual mode MS connected to the sixth WLAN AP by the UNC is not authorized. Before accessing the wireless network, it is possible to determine which MSC is appropriate to determine the serving MSC by acquiring the connected mobile communication network cell information. For example, the second BTS B connected to the first MSC, such as the first dual mode MS, may be used. In case of the dual-mode MS that is in the service area of the 6th WLAN AP and moves to the service area of the 6th WLAN AP, the second BTS is more likely to move to the service area of the second BTS B than to move to the service area of the third BTS A. By determining the first MSC that manages B as the serving MSC, handoffs between MSCs are avoided, and in the service area of the third BTS A connected to the second MSC like the second dual mode MS, the service area of the sixth WLAN AP Moved to In the case of the dual-mode MS, it is more likely to move back to the service area of the third MTS A than to move to the service area of the second BTS B, and thus, handoff between MSCs is determined by determining the serving MSC as the serving MSC. Will be avoided.

In addition, in the present invention, for the dual mode MS located outside the service area of the CDMA mobile communication network, such as the third dual mode MS connected to the ninth WLAN AP, the entirety of the UNC communicating with the ninth WLAN AP through the IP transport network A method of determining a serving MSC in consideration of call processing load balancing, a method of determining a second MSC as a serving MSC after the mobile communication network cell to which the third dual mode MS finally accesses acquires information of the third BTS A; The serving MSC may be determined by selecting one of the methods of determining the second MSC as the serving MSC for all the dual mode MSs that register the geographical location of the WLAN AP to the UNC in advance and access the ninth WLAN AP.

As described above, when the optimum serving MSC is determined by the UNC, the same serving MSC is used when the dual mode MS located in the same area is connected to an unauthorized wireless network and when connected to a CDMA mobile communication network. In the handoff process between the mobile communication network and the unauthorized wireless network, handoff between MSCs can be prevented.

A method of determining a serving MSC in an unlicensed wireless network and a CDMA mobile communication network convergence service system according to the present invention will be described with reference to FIG.

First, any dual-mode MS checks whether a wireless LAN signal is detected by the user when the user turns on the power or moves, and if the dual-mode MS is powered on, first attempts to access an unauthorized wireless network or CDMA When moving from a service area of a mobile communication network to a service area of an unlicensed wireless network, a WLAN signal transmitted from a WLAN AP of a corresponding unlicensed wireless network is detected.

That is, the dual mode MS checks whether the WLAN signal transmitted from the WLAN AP is detected (step S61). In this case, if the WLAN signal is detected, the WLAN after performing the WLAN access to the corresponding WLAN AP The IP communication is performed through the AP to perform a procedure of registering with the UNC of the unlicensed wireless network (step S62).

In addition, the dual-mode MS transmits the mobile communication network cell information, that is, the BTS identification information and / or the identification information of the WLAN AP currently connected to the WLAN AP and the IP delivery network, to which it was finally connected during the UNC registration procedure. In this case, when the dual mode MS is powered on and connected to an unlicensed wireless network, the dual mode MS does not have the cell network information that was connected to the wireless LAN AP. Only identification information is reported to UNC (step S63).

Thereafter, the UNC of the unlicensed wireless network searches the pre-registered MSC information table using the mobile communication network cell information reported from the dual mode MS or the currently connected WLAN AP identification information to determine the serving MSC of the corresponding dual mode MS. To this end, the UNC checks whether the mobile communication network cell information exists in the information reported from the dual-mode MS (step S64).

If there is mobile network cell information in the information reported from the dual-mode MS, the UNC uses the mobile network cell information reported from the dual-mode MS, that is, the BTS identification information, which is the mobile network cell information that the dual-mode MS finally connected to. The MSC information table corresponding to the mobile communication network cell information registered in advance in the UNC is searched (step S65) to determine the serving MSC of the dual mode MS (step S67).

And, if there is no mobile communication network cell information among the information reported from the dual mode MS, that is, only the currently connected WLAN AP identification information is reported, the UNC is based on the identification information of the WLAN AP reported from the dual mode MS. The MSC of the region where the dual mode MS is geographically determined is determined. For this purpose, the MSC information table corresponding to the WLAN AP identification information registered in advance in the UNC is searched (step S66), and the serving MSC of the dual mode MS is determined. It is decided (step S67).

In this way, if the UNC of the unlicensed wireless network determines the serving MSC of the dual mode MS located in its service area, the MSC handoff can be avoided when the dual mode MS is handed off between the CDMA mobile communication network and the unlicensed wireless network. It becomes possible.

For example, as illustrated in FIG. 7, an arbitrary dual mode MS user, that is, a first dual mode MS 71 connects to a second BTS 82 of a CDMA mobile communication network and transmits and receives CDMA wireless data. When making a call, since the second BTS 82 is connected to the first MSC 91 through the BSC 83, the first dual mode MS 71 uses the first MSC 91 as the serving MSC. The call partner of the first dual mode MS 71 is connected to the first MSC 91.

In this case, the service area of the first wireless LAN AP 85 constituting the unlicensed wireless network is included in the service area of the second BTS 82 and the first wireless LAN AP 85 and the second wireless LAN AP 86. UNC 87 of an unlicensed wireless network that communicates through an IP transport network should be connected to not only the second MSC 92 but also the first MSC 91 at the same time.

Meanwhile, the first dual mode MS 71 is connected to the BSC 83 of the CDMA wireless network through the second BTS 82 to make a voice call. As shown in FIG. 8, the service area of the unauthorized wireless network is illustrated. That is, when moving to the service area of the first wireless LAN AP 85, the first dual mode MS 71 detects the wireless LAN signal transmitted from the first wireless LAN AP 85 of the unlicensed wireless network, Accordingly, the wireless LAN access to the first wireless LAN AP 85 is performed, and IP communication is performed through the first wireless LAN AP 85 to perform registration of the UNC 87 of the unlicensed wireless network. .

In this case, the first dual mode MS 71 performs mobile communication network cell information (ie, second BTS identification information) that it has finally accessed while performing the registration procedure, and identification information of the WLAN AP that is currently connected thereto (ie, The MAC address of the first WLAN AP) is reported to the UNC 87 through the first WLAN AP 85.

The UNC 87 determines a serving MSC to be used by the first dual mode MS 71 according to the mobile communication network cell information reported from the first dual mode MS 71, wherein the first dual mode MS ( 71 reports the mobile communication network cell information corresponding to the second BTS 82 to the UNC 87, so the UNC 87 reports the first MSC 91 on the second BTS 82 to the first dual mode MS 71; Is determined by the serving MSC.

Therefore, when the serving MSC of the first dual mode MS 71 is determined as the first MSC 91 by the UNC 87 of the unlicensed wireless network, the CDMA movement is subsequently performed when the first dual mode MS 71 is handed off. When requesting a handoff from the first MSC 91 of the communication network to the UNC 87 of the unlicensed wireless network that is the target UNC, the UNC 87 requests that the first MSC 91 requesting the handoff is performed by the first dual-mode MS 71. Since the first MSC 91 is already determined as the serving MSC when the MSC is the serving MSC, the handoff procedure can be normally performed through the first MSC 91. ) Is connected to the first MSC 91 and the second MSC 92, and the UNC 87 determines the serving MSC based on mobile network information obtained from the first dual mode MS 71. It is possible to proceed with the handoff procedure through the first MSC 91 rather than the 2MSC 92, so that the second MSC 92 does not participate in the handoff. It is possible to avoid the inter-MSC handoff to the door.

When the handoff is completed for the first dual mode MS 71 that has moved from the CDMA mobile communication network to the unlicensed wireless network through the first MSC 91 serving as the serving MSC, as shown in FIG. The call to the 1 dual-mode MS 71 is connected to the UNC 87 from the first MSC 91, which is the serving MSC, so that the first dual-mode MS 71 moves to the unlicensed wireless network. Through the first MSC (91), which is connected from, it is possible to continue the call.

In addition, the embodiment according to the present invention is not limited to the above description, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art in connection with the present invention. Although a case of moving from a mobile communication network to an unauthorized wireless network has been described, the mobile MSC using the mobile communication network cell information that the dual mode MS finally connected to and / or the WLAN AP identification information currently connected to the dual mode MS has also been described. By determining the inter-MSC handoff can be avoided.

As described above, the present invention provides a procedure for connecting an UNC of an unlicensed wireless network with a plurality of MSCs in a converged service system for combining and interworking with an unlicensed wireless network and a mobile communication network, and registering a dual-mode MS with an UNC of an unlicensed wireless network. The UNC determines the serving MSC using the last accessed mobile cell network information or the currently connected WLAN AP identification information when executing the MSC. Off can be avoided.

In addition, the present invention determines a serving MSC based on the mobile communication network cell information that the dual mode MS last connected in the UNC of the unlicensed wireless network or the currently connected WLAN AP identification information to handoff between the mobile communication network and the unlicensed wireless network. By avoiding handoff between MSCs, not only the overall handoff processing speed can be improved, but also the network resources can be saved, and further, the possibility of handoff failure due to a lack of network resources can be significantly improved.

Claims (11)

In a converged service system for combining and interworking an unlicensed wireless network and a CDMA mobile communication network, When the WLAN signal transmitted from the wireless LAN AP of the unlicensed wireless network is detected, the mobile communication network cell information and / or presently connected to the mobile terminal during the procedure of accessing and registering the unlicensed wireless network through the wireless LAN AP A dual mode MS for reporting access AP identification information; A network controller of an unlicensed wireless network that is connected to a plurality of MSCs and communicates with a WLAN AP through an IP delivery network, and is based on a geographical location using mobile network cell information or WLAN AP identification information reported from the dual-mode MS. A UNC for determining a serving MSC of the dual mode MS, The plurality of MSCs connected to the UNC are unlicensed wireless networks and CDM mobile communication network convergence service systems, characterized in that the MSCs include an area in which each WLAN AP communicating with the UNC via an IP delivery network is installed as a service area. Serving MS determination device in. delete The method of claim 1, The UNC determines the serving MSC using the mobile communication network cell information or the WLAN AP identification information reported from the dual mode MS, and when only the WLAN AP identification information is reported from the dual mode MS, the registered wireless The MSC information table corresponding to the LAN AP identification information is searched to determine the serving MSC of the dual mode MS, and when the mobile cell information is reported from the dual mode MS, the MSC information corresponding to the registered mobile network cell information. And a serving MSC determination device in an unlicensed wireless network and CDM mobile communication network convergence service system, wherein the serving MSC of the dual mode MS is determined by searching a table. The method of claim 1 or 3, And the mobile communication network cell information is BTS identification information of a CDMA mobile communication network to which a dual mode MS was last connected. The method of claim 1, The UNC determines the serving MSC of the dual mode MS in consideration of the overall call processing load distribution when the dual mode MS registration procedure is performed through the WLAN AP located outside the service area of the mobile communication network. Serving MS determination device in network and CDM mobile communication network convergence service system. The method of claim 1, The UNC determines a serving MSC by using the mobile communication network cell information last accessed by the dual mode MS when the dual mode MS registration procedure is performed through the WLAN AP located outside the service area of the mobile communication network. Serving MS determination device in unlicensed wireless network and CDM mobile communication network convergence service system. The method of claim 1, When the dual mode MS registration procedure is performed through a WLAN AP located outside a service area of a mobile communication network, the UNC registers a serving MSC according to the geographic location of the WLAN AP in advance to access the WLAN AP. A serving MS determination device in an unlicensed wireless network and a CDM mobile communication network converged service system, characterized in that a pre-registered MSC for a dual mode MS is determined as a serving MSC. Performing a WLAN connection to the WLAN AP when a dual mode MS capable of accessing both an unlicensed wireless network and a CDMA mobile communication network detects a WLAN signal transmitted from an arbitrary WLAN AP; During the procedure of performing IP communication through the WLAN AP to register with the UNC of the unlicensed wireless network, the dual mode MS cell information and the identification information of the currently connected WLAN AP are accessed. Reporting to the UNC; Determining a serving MSC of the dual mode MS by searching for a pre-registered MSC information table in the UNC using mobile communication cell information or WLAN AP identification information reported from the dual mode MS, In the dual mode MS, the process of reporting the mobile communication network cell information and / or identification information of the currently connected WLAN AP to the UNC may include a dual mode MS that first connects to an unlicensed wireless network when the power is turned on. In the case of no mobile communication network cell information that was finally connected to the serving MS determination method in the unlicensed wireless network and the CDM mobile communication network converged service system, characterized in that reporting only the identification information of the currently connected WLAN AP to the UNC. delete The method of claim 8, The determining of the serving MSC of the dual mode MS includes: checking whether there is mobile communication network cell information among information reported from the dual mode MS; If there is mobile cell information, the MSC information table corresponding to the previously registered mobile communication cell information is searched using BTS identification information, which is the mobile communication cell information reported from the dual mode MS, to search for the serving MSC of the dual mode MS. Determining; If there is no mobile communication cell information, the serving MSC of the dual mode MS is determined by searching the MSC information table corresponding to the registered WLAN AP identification information using the WLAN AP identification information reported from the dual mode MS. Serving MS determination method in an unlicensed wireless network and CDM mobile communication network converged service system comprising the step of. The method of claim 8, Determining the serving MSC of the dual-mode MS, the analysis of the WLAN AP identification information reported from the dual-mode MS, the total call processing load when it is determined that the WLAN AP is located outside the service area of the CDMA mobile communication network The serving MSC of the dual mode MS is determined in consideration of the distribution, or the serving MSC of the dual mode MS is determined using the mobile network cell information that the dual mode MS last connected to, or the geographical location of the WLAN AP. By registering the serving MSC according to the location in advance, the unlicensed wireless network and the CDA mobile communication network convergence service system for determining a pre-registered MSC for all dual-mode MSs connected to the WLAN AP as a serving MSC. How to determine serving MS in.

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