Apparatus for providing both public and private mobile communication services in a predetermined service area using a mobile terminal

Abstract: A device for connecting a public mobile communication service system (50) to a private mobile communication service system (60), and providing a mobile station (44) in a predetermined service area (42) with both a public mobile communication service and a private mobile communication service. The device includes a base station transceiver subsystem BTS (8-k) located in the predetermined service area (42), for forming a radio channel to the mobile station (49) in the service area; a communication path provider (82) connected to the BTS (8-k), a base station controller (4-m) in the public mobile communication service system (50), a mobile switching function of the private mobile communication service system and a call manager (80), said communication path provider (82) providing a communication path for transmitting data between the BTS (8-k) and the private or public mobile communication service systems (50,60) via the call manager (80) and said call manager (80) for distinguishing the public mobile communication service from the private mobile communication service by analyzing data received through the communication path, and performing call management for the corresponding service.

Description: The present invention relates to an apparatus for connecting a public mobile communication service system to a private mobile communication service system. Most existing mobile communication systems are designed to support either a public mobile communication service or a private mobile communication service, so that a subscriber registered in the public mobile communication network can be provided with only the public mobile communication service, while a subscriber registered in the private mobile communication network can be provided with only the private mobile communication service. A public mobile communication network includes a plurality of mobile switching centers (MSCs), a plurality of base station controllers (BSCs), a plurality of base station transceiver subsystems (BTSs), and a plurality of mobile stations (MS) registered in the public mobile communication network. A private mobile communication network includes a private mobile system with a radio interface (I/F), and a plurality of mobile stations registered in the private mobile communication network. Mobile stations registered in the public mobile communication network can be provided with the mobile communication service only within the service area (or coverage) of the public mobile communication network, while the mobile stations registered in the private mobile communication network can be provided with the mobile communication service only within the service area of the private mobile communication network. WO 96/35309 A1 discloses a hybrid local cellular exchange system which includes a cPBX (cellular exchange) subsystem that performs many of the switching functions of a GSM mobile-services switching center (MSC). The cPBX controls one or more base station controllers (BSCs), each of which controls one or more base transceiver stations (BTSs). Each BTS in turn is capable of co-ordinating communications with the plurality of cellular handsets which are referred to as mobile station units (MSs). A distinction is made between "local" handsets that are "native" to the local cellular exchange system and "non native" handsets that do not belong to the local exchange. Native handsets are registered with a private registry within cPBX subsystems while non native handsets are not. Call path between native handsets preferably remain within the domain controlled by the local network. The hybrid network has the ability to seamlessly handle calls from and to non native handsets. The hybrid network has the ability to establish communication with a public network, e.g. within the PLMN (public land mobile network). From the standpoint of the PLMN the hybrid network acts and functions like an ordinary base station subsystem (BSS) comprising a BSC and a BTS. Transcoder rate adapter units (TRAU) are provided when desirable to improve the efficiency of the system. The TRAUs have the ability to convert among 8Kbit/s, 16Kbit/s, 32Kbit/s and 64Kbit/s time division multiplex data streams. A registry is provided to keep track of handsets that have a home location in cPBX subsystem, i.e. the native handsets. The registry performs the functions of both Home Location Register (HLR) and Visitor Location Register (VLR). It is the object of this invention to reduce necessary infrastructure costs. This object is achieved by an apparatus of claim 1. Preferred embodiments of the subject matters of the dependent claims. The above object, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which: FIG. 1 is a diagram illustrating a mobile communication system in which a public mobile communication service and a private mobile communication service are available only in their associated networks; FIG. 2 is a public/private mobile communication network according to an embodiment of the present invention; and FIG. 3 is a diagram illustrating a mobile communication system capable of providing both a public mobile communication service and a private mobile communication service according to an embodiment of the present invention. FIG. 1 shows a mobile communication system designed such that the public mobile communication service is provided only in the public communication network and the private mobile communication service is provided only in the private communication network. Referring to FIG. 1, a public mobile communication network 10 includes a plurality of mobile switching centers (MSCs) 2-1 to 2-n, a plurality of base station controllers (BSCs) 4-1 to 4-m, a plurality of base station transceiver subsystems (BTSs) 6-1 to 6-k and 8-1 to 8-k, and a plurality of mobile stations (MS) 12 and 14 registered in the public mobile communication network 10. A private mobile communication network 20 includes a private mobile system 23 with a radio interface (I/F) 24, and a plurality of mobile stations 26 and 28 registered in the private mobile communication network 20. In the system configuration of FIG. 1, the mobile stations 12 and 14 registered in the public mobile communication network 10 can be provided with the mobile communication service only within the service area (or coverage) of the public mobile communication network 10, while the mobile stations 26 and 28 registered in the private mobile communication network 20 can be provided with the mobile communication service only within the service area of the private mobile communication network 20. Therefore, the mobile communication system of FIG. 1 is disadvantageous in that a user of the mobile station cannot be provided with the mobile communication service if he or she moves out of the coverage of the mobile communication network in which the mobile station is registered. In this case, the mobile stations 26 and 28 registered in the private mobile communication network 20 cannot access the public mobile communication network 10, thus unable to be provided with the public mobile communication service, while the mobile stations 12 and 14 registered in the public mobile communication network 10 cannot access the private mobile communication network 20, thus unable to be provided with the private mobile communication service. Even a subscriber registered in both the public mobile communication network 10 and the private mobile communication network 20 must switch an operation mode of the mobile station when moving from one network to another network. That is, to access the private mobile communication network 20, a mobile station currently being serviced by the public mobile communication network 10 must switch the operation mode to a private mobile communication network-use mode. On the contrary, to access the public mobile communication network 10, a mobile station currently being serviced by the private mobile communication network 20 must switch the operation mode to a public mobile communication network-use mode. In an exemplary embodiment of the present invention, the system elements constituting a public mobile communication network (10 of FIG. 1) are provided independently of the system elements constituting a private mobile communication network (20 of FIG. 1). In order to allow the mobile station in a predetermined service area be able to be provided with both the public mobile communication service and the private mobile communication service, the embodiment includes an apparatus for interconnecting the two independent mobile communication networks 10 and 20. The predetermined service area will be referred to as public/private common mobile communication service area . FIG. 2 shows a public/private mobile communication network according to an embodiment of the present invention, and FIG. 3 shows a mobile communication system capable of providing both a public mobile communication service and a private mobile communication service according to an embodiment of the present invention. The system of FIG. 3 includes the apparatus for interconnecting the two independent mobile communication networks. Referring to FIG. 2, in a public/private mobile communication network 40 according to an embodiment of the present invention, a base station transceiver subsystem (BTS) 8-k, out of a plurality of BTSs 6-1 to 6-k and BTSs 8-1 to 8-k, is connected in common to a base station controller (BSC) 4-m in the existing public mobile communication network and a private mobile system 22 in the existing private mobile communication network. A service area (or coverage area) of the BTS 8-k is defined as a public/private common mobile communication service area 42 according to an embodiment of the present invention. The private mobile system 22 is a system for processing a radio call and a wire call. A private branched exchange (not shown) and an independent private mobile control system (not shown) can be typically used for the private mobile system 22. The private mobile system 22 includes a radio interface 24. For reference, in the public/private mobile communication network 40 of FIG. 2, the mobile switching centers (MSCs) 2-1 to 2-n each control the connection between their associated BSCs 4-1 to 4-m and the Public Switched Telephone Network and Integrated Services Digital Network (PSTN) 30 or other MSCs in the public mobile communication network. The BSCs 4-1 to 4-m perform a radio link control function and a handoff function, and the BTSs 6-1 to 6-k and BTSs 8-1 to 8-k form radio communication paths to the mobile stations 12, 14 and 44 located in its communication service area (or cell area), and manage the radio resources. In order to allow, for example, the mobile station 44 located in the public/private common mobile communication service area 42 to be able to be provided with both the public mobile communication service and the private mobile communication service, additional devices are provided in addition to the devices commonly included in the public mobile communication network and the private mobile communication network. Referring to FIG. 3, a call manager (CM) 80, a high capacity IPC (Inter-Processor Communication) node board Assembly (HINA) 82, and a transcoder and selector bank (TSB) 84 are additionally provided. The HINA 82 has a function of providing a communication path, and is connected in common to the BTS 8-k in the public/private common mobile communication service area 42 and the private mobile system 22 via the TSB 84 according to an embodiment of the present invention. The HINA 82 is also connected to the call manager 80 and BSC 4-m for transmitting data. The call manager 80 analyzes a received message, determines whether the received message is for the public mobile communication service or the private mobile communication service, and performs the service control correspondingly. The call manager 80 is a workstation having a function block for serving as the private BSC/MSC corresponding to the BSC/MSC of the public mobile communication network. In addition, the call manager 80 includes a visitor location register (VLR) for registering the mobile station intended to be provided with the private mobile communication service. Moreover, the call manager 80 exchanges information with the private mobile system 22 via a local area network (LAN) 85 to control a switch (not shown) included in the private mobile system 22. Every call control signal generated from the BTS 8-k in the public/private common mobile communication service area 42 is provided to the call manager 80, which is interlinked with the private mobile system 22. The TSB 84 is interposed between an E1 interface 88 of the private mobile system 22 and the HINA 82, and serves as an interface for providing a path for the voice or data cells. That is, the TSB 84 performs various functions for providing a traffic data path. More specifically, the TSB 84 manages a 2.048Mbps/1.54Mbps non-multiplexing transmission channel interfacing function, a vocoder function for voice coding and decoding ((e.g., PCM (Pulse Code Modulation) ↔ QCELP (Qualcomm Code Excited Linear Predictive coding)), a function of controlling a soft handoff call, an audio selecting function, and a power control function. In FIG. 3, a block 50 includes the elements used for the public mobile communication service, and a block 60 includes the elements used for the private mobile communication service. The elements for the public mobile communication service further include a Home Location Register (HLR) 70, a VLR 72, and a short message service controller (SMSC) 74. The HLR 70 performs a subscriber location registration function and a database function for storing the subscriber information. The VLR 72 serves as a database for temporarily storing information about the mobile station existing in the cell area managed by the associated MSC out of the MSCs 2-1 to 2-n. If the mobile station moves into a cell area managed by another MSC, the information stored in the VLR is deleted. The SMSC 74 serves as a controller for providing a short message service on the public mobile communication network. Among the elements for the private mobile communication service, the private mobile system 22 includes an input/output (I/O) interface 90, a trunk interface (TRK) 92, a digital line interface (DLI) 94, a subscriber line interface (SLI) 96 and an E 1 interface 88. The E1 interface 88 serves as the radio interface 24 of FIG. 2. The I/O interface 90 is connected to the LAN 85, the trunk interface 92 is connected to the PSTN 30, and the digital line interface 94 is connected to a digital phone (DGP) 99. Further, the subscriber line interface 96 is connected to a wire telephone 98, and the E1 interface 88 is connected to the TSB 84. In addition, the private mobile communication service block 60 includes an SMSC 86, connected to the LAN 85, serves as a controller for providing a short message service on the private mobile communication network. Now, with reference to FIGs. 2 and 3, a detailed description will be made of a public mobile communication service and a private mobile communication service according to an embodiment of the present invention. To be provided with the public mobile communication service, the mobile station must be first registered in the HLR 70 connected to the MSC 2-1. A mobile station registration procedure is well known to those skilled in the art. The public mobile communication service according to an embodiment of the present invention will be described in detail after the mobile station is registered in the HLR 70. If the mobile station 44 in the public/private common mobile communication service area 42 generates a call origination request message, then the generated call origination request message is sent to the call manager 80 through the BTS 8-k and the HINA 82. The call manager 80 then determines whether the received call origination request message is equivalent to a public mobile communication service request or a private mobile communication service request, and sends the call origination request message to either the public mobile communication network or the private mobile communication network according to the determination results. Determining by the call manager 80 whether the call origination request message is equivalent to the public mobile communication service request or the private mobile communication service can be implemented in the following methods. In a first method, the user requiring the private mobile communication service dials a specific identification code in addition to the telephone number. In a second method, the private mobile communication service provided to the mobile station in the public/private common mobile communication service area 42 is previously set by time slot. In a third method, a mobile subscriber requiring the private mobile communication service is previously registered in the call manager 80 by the operator. If the call origination request message is equivalent to the public mobile communication service request, the call manager 80 sends the call origination message to the MSC 2-1 via the HINA 82 and the BSC 4-m. The subsequent operation follows the common mobile communication service procedure. If a call is set up by the call origination request message, the call manager 80 constantly sends the messages received subsequently from the BTS 8-k to BSC 4-m until the corresponding call is ended. A call termination request message from the public mobile communication network is provided to the call manager 80 via the BSC 4-m and the HINA 82. The call manager 80 then sends the call termination request message to its interior and the BTS 8-k. Further, the call manager 80 analyzes the call termination request message to determine whether there is service control to be processed by the call manager 80 itself, and disregards the call termination request message if there is no service control to be processed. Therefore, in this case, the call termination service is performed which is identical to the common public mobile communication termination service. Other Functions (SMS (short message service), Data Call, and All Sorts of Functions) are processed according to the characteristics of the corresponding services in accordance with the above call processes. The SMS is serviced in the same method as the function provided in the existing public mobile communication service. A mobile station intended to be provided with the private mobile communication service in the public/private common mobile communication service area 42 must be registered in the call manager 80. The call manager 80 determines whether the corresponding call is for the public mobile communication service or the private mobile communication service, and processes the call correspondingly. In one case, the traffic data path for the private mobile communication service can be comprised of the mobile station 44 in the public/private common mobile communication service area 42, the BTS 8-k, the HINA 82, the TSB 84, the switch in the private mobile system 22, and the wire terminal connected to the private mobile system 22. In another case, the traffic data paths can be comprised of the mobile station 44 in the public/private common mobile communication service area 42, the BTS 8-k, the HINA 82, the TSB 84, the switch of the private mobile system 22, the TSB 84, the HINA 82, the BTS 8-k and a second mobile station in the public/private common mobile communication service area 42. A detailed description of the private mobile communication service according to an embodiment of the present invention will be given below. A call origination request message generated by the mobile station 44 in the public/private mobile communication network 40 is provided to the call manager 80 via the BTS 8-k and the HINA 82. The call manager 80 determines whether the received call origination request message is equivalent to the public mobile communication service request or the private mobile communication service request, and sends the call origination request message to either the public mobile communication network or the private mobile communication network according to the determination results. In the public mobile communication call origination service, determining by the call manager 80 whether the call origination request message is equivalent to the public mobile communication service request or the private mobile communication service can be implemented in the same methods as stated above. Describing the methods again, in a first method, the user requiring the private mobile communication service dials a specific identification code in addition to the telephone number. In a second method, the private mobile communication service provided to the mobile station in the public/private common mobile communication service area 42 is previously set by time slot. In a third method, a mobile subscriber requiring the private mobile communication service is previously registered in the call manager 80 by the operator. The system operator may allow the call manager 80 to support one or more of the above methods. If it is determined that the call origination request message is equivalent to the private mobile communication service request, the call manager 80 sends the call origination request message to the internal BSC and MSC modules (not shown). Thereafter, each module performs call processing in the call processing process similar to the general call origination process. In addition, to form the traffic data path, the call manager 80 determines a radio channel and a channel of the TSB 84 by the BSC module and the MSC module, and then, sends a specific message to the private mobile system 22. The private mobile system 22 forms the traffic data path by connecting a predetermined channel based on the specific message and controlling the switch in the private mobile system 22. The message is exchanged between the call manager 80 and the private mobile system 22 via the LAN 85. Thereafter, the call control is performed using the LAN 85 between the MSC or the call manager 80 and the private mobile system 22, and the corresponding BTS, for example, the BTS 8-k of FIGs. 2 and 3 is used as a private BTS for this call only. If a terminating terminal is, for example, the mobile station 44 in the public/private common mobile communication service area 42 and an originating terminal is a wire telephone, the call termination message is sent to the MSC of the call manager 80 via the LAN 85. Meanwhile, if the terminating terminal is, for example, the mobile station 44 in the public/private common mobile communication service area 42 and the originating terminal is another mobile station in the public/private common mobile communication service area 42, the call termination message is generated by the MSC of the call manager 80. The MSC of the call manager 80 sends the call termination message to the BTS 8-k in the general radio call termination process. The BTS 8-k wirelessly transmits the call termination message to the corresponding mobile station 44. A termination response message of the mobile station 44 is sent to the call manager 80 via the BTS 8-k, and the call manager 80 analyzes the termination response message and determines to which one of the public mobile communication network and the private mobile communication network the termination response message is to be sent. If the termination response message is a message to be processed by the call manager 80 itself, the call manager 80 sends the termination response message to its internal modules. Thereafter, the corresponding BTS 8-k, the mobile station, the MSC module in the call manager 80, and the private mobile system 22 control the call according to the general call control process. Other Functions (SMS, Data Call, and All Sorts of Functions) are processed according to the characteristics of the corresponding services in accordance with the call processes described above. For the SMS, the service request is send to the MSC of the call manager 80 via the private SMSC 86, and subsequently, the SMS is processed in the general call processing process. The invention has the following advantages. First, a specific mobile station can be provided with both the public mobile communication service and the private mobile communication service without any additional management. That is, it is possible to access the two independent networks while providing transparency to the user for the origination call, the termination call and other additional functions. Second, it is possible to provide the mobile station registered in both the public mobile communication network and the private mobile communication network, with both the public mobile communication service and the private mobile communication service, and the mobile subscriber can be provided with an additional service. Third, since the mobile station used for the public mobile communication network can access the private mobile communication network, the mobile station can be provided with various services of the general private mobile communication network.

Claims: A service apparatus for connecting a public mobile communication service system (50) to a private mobile communication service system (60), so as to provide a mobile station (44) in a predetermined service area with both a public mobile communication service and a private mobile communication service, the service apparatus comprising: a node board assembly (82) providing a first interface to a base station transceiver subsystem (8-k), a second interface to a base station controller (4-m) in the public mobile communication service system (50) and a traffic data path; the base station transceiver subsystem (8-k) being located in the predetermined service area, for forming a radio channel to the mobile station (44) in the predetermined service area; a call manager (80) for distinguishing the public mobile communication service from the private mobile communication service by analysing data received through the traffic data path, and performing call management for the corresponding service; the call manager (80) being connected to the node board assembly (82); and a transcoder and selector bank (84) connected to the node board assembly (82) and providing a third interface to a private mobile system (22) of the private mobile communication service system (60), thereby providing the possibility to extend the traffic data path to the private mobile communication service system (60) and to transmit data between the base station transceiver subsystem (8-k) and the private mobile communication service system; the transcoder and selector bank (84) managing a vocoder function for voice coding and decoding. The service apparatus as claimed in claim 1, wherein the call manager (80) comprises means for determining whether a specific identification code is added to a telephone number of the mobile station to distinguish the public mobile communication service from the private mobile communication service. The service apparatus as claimed in claim 1, wherein the call manager (80) comprises means for distinguishing the public mobile communication service from the private mobile communication service based on information previously set by time slot. The service apparatus as claimed in claim 1, wherein the call manager (80) comprises means for distinguishing the public mobile communication service from the private mobile communication service based on registration information of a mobile subscriber requiring the private mobile communication service.

Inventors: KIM HA-HONG, LEE GUI-JUNG, YANG DOO-YONG, KIM, HA-HONG, LEE, GUI-JUNG, YANG, DOO-YONG
Applicants: SAMSUNG ELECTRONICS CO LTD, SAMSUNG ELECTRONICS CO., LTD.
Application year: 2001
Main classification: H04Q7
IPC codes: H04B7, H04W84, H04W4