WO2005055625A1

WO2005055625A1 - In-building mobile communication system and in-building base station device

Info

Publication number: WO2005055625A1
Application number: PCT/JP2004/018047
Authority: WO
Inventors: Takeshi Kunugi; Masahiro Ohsugi; Takuya Miyazawa
Original assignee: Fujitsu Limited
Priority date: 2003-12-03
Filing date: 2004-12-03
Publication date: 2005-06-16
Also published as: JP2007059955A

Abstract

In an in-building base station device (102) of an in-building mobile communication system, in response to all the transmission requests to a public network received via a plurality of subscriber interfaces corresponding to different communication methods, relay means (111) relays the transmission requests by standing proxy for the transmission requests to the public network via a base station interface transmitting/receiving a cabled or radio signal to/from a base station of the public network operating according to a predetermined communication method. Communication path forming means (112) forms a communication path connecting the subscriber interface corresponding to the mobile communication terminal of the transmission source to the base station interface. Signal conversion means (113) mutually converts a signal transferred via the communication path according to a code method employed in a communication method corresponding to the subscriber interface corresponding to the mobile communication terminal of the transmission source and the base station interface. With this configuration, it is possible to flexibly cope with the change of traffic deviation accompanying the advance of the generation shift associated with the communication method and effectively use the resources such as a signal transmission path.

Description

Specification

Premise mobile communication system and premise base station device

Technical field

The present invention relates to a mobile communication service between subscribers in a building such as a tenant building, an office building, a department store or a hotel, and an underground shopping mall, and between a subscriber staying inside and an external subscriber. Mobile communication services using mobile phones and PHS for private mobile communication systems to provide mobile communication services that mediate communication and private base station equipment provided in local mobile communication systems have been remarkably developed as services for outdoor subscribers. As a result, subscriber terminals for these mobile communication services have already become widespread. With the spread of mobile communication, there has been a growing demand for the provision of communication services via mobile communication terminals even in premises where fixed telephones have been mainly used in the past.

[0002] In response to demand for such a service, for example, a subscriber carries a mobile device such as an IMCS (Inbuilding Mobile Communication System) provided by NTT Docomo Inc. A private mobile communication system that treats a communication terminal as if it were an extension telephone has been put to practical use.

Background art

FIG. 19 shows a configuration example of a general private mobile communication system.

In the private mobile communication system shown in FIG. 19, a private base station (BTS) 401 uses an antenna 402 and a transceiver 403 provided on each floor of the private premises to move a subscriber staying on the private premises. By transmitting and receiving a radio signal to and from a communication terminal, and further relaying the radio signal to a radio base station 405 of a public network via a dedicated line, a connection service to an external line is realized.

In such a private mobile communication system, if a mobile communication terminal of a subscriber is compatible with a communication system (for example, PDC: Personal Digital Cellular system) used for a service of the local mobile communication system, Exactly the same as using the mobile communication terminal outdoors It can also be used in premises. Further, by providing the PBX function in the local base station apparatus 401, it is possible to realize a call between subscribers staying on the local area without the intervention of a public network.

[0005] Of course, as shown in FIG. 19, in addition to the local base station apparatus 401 and the antenna 402 corresponding to the PDC scheme, the local base station apparatus 411 and the antenna 412 corresponding to the PHS scheme need to be installed in the premises. You can also. Then, by connecting these local base station apparatuses 411 and the wireless base stations 413 corresponding to the respective communication systems with dedicated lines, the subscriber terminals of various communication systems can be installed inside the building shown in FIG. (See Non-Patent Document 1)

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[0006] Similarly, a private mobile communication system that can use a mobile communication terminal conforming to IMT-2000, which is a communication method of a third-generation mobile phone, has been proposed. For example, in Japanese Patent Application Laid-Open No. 2004-289617, entitled “Extension-adding device and network system using extension-addition device”, the applicant has been able to use a mobile communication terminal conforming to the IMT-2000 system on the premises. A mobile communication system has been proposed jointly with Fujitsu Network Solutions Co., Ltd. and NTT DoCoMo, Inc.

[0007] In addition, a simplified private mobile communication system as shown in Fig. 20 has been proposed for a relatively small store or the like.

In FIG. 20, a relay amplifier 431 is wirelessly connected to a wireless base station 433 of a public network (for example, a PDC network) via an outdoor antenna 432 installed outdoors, and transmits and receives signals transmitted and received via an indoor antenna 434 to the wireless base station. Relay between stations 433.

[0008] In such a simplified private mobile communication system, it is not necessary to lay a dedicated line between the wireless base station of the public network and the system can be introduced at a relatively low cost. (See Non-Patent Document 2).

By the way, with the commencement of practical use of communication systems (such as IMT-DS) conforming to IMT-2000, the service area has been gradually expanded, but at present, mobile communication terminals that conform to IMT-2000 Dissemination is still a force. For this reason, the number of mobile communication terminals that conform to IMT-2000 is far below the number of second-generation mobile terminals that have reached the peak of popularization. [0009] Under these circumstances, at present, the capability of a mobile communication system that provides an IMT-2000 public network has more room than actual traffic, while the PDC public The capacity of the mobile communication system to provide the network is very busy and has little room to handle current traffic. In this way, when the generation change of the mobile communication system is in progress, the traffic is biased toward the mainstream communication system, and the capacity that can be provided by the mainstream communication system network system at that time While demand for transmission capacity is tightening, the capabilities of a new generation of mobile communication systems that have been prepared ahead of time to acquire new customers are being neglected. It is considered that such a phenomenon can occur not only at the time of the generation change from the second generation to the third generation, but also at the time of the subsequent generation change.

[0010] On the other hand, depending on the location, there may be a traffic bias between the PDC scheme and the PHS scheme. It is widely known that in the case of such a bias, a better communication quality can be obtained by using a communication method having a sufficient processing capacity. For example, mobile communication terminals that support both PDC and PHS systems and have the function of sending outgoing requests to base stations in communication systems where better communication quality can be expected (so-called dual terminal ) Has also been proposed (see Patent Document 1).

[0011] Of course, overseas, the transition from the GSM (Global System of Mobile communications) system, which is the communication system for the second generation mobile communication service, to the IMT-2000 system is progressing, and A situation has occurred.

The GSM system is a widely used mobile communication system in Asia and Oceania other than Europe and Japan.As shown in Figure 21, even in these regions alone, 700 million The number of subscribers is increasing, and a further increase is expected (see Non-Patent Document 3). And this huge number of subscribers will also increasingly choose third generation mobile services.

Patent Document 1: Japanese Patent Application Laid-Open No. 2000-209644 (Paragraph [0018] to Paragraph [0030], FIG. 4) Non-Patent Document 1: “IMCS: System Using IMCS”, Example of Utilization of Corporate Service Tab, [online], NTT Docomo Hokkaido, [03/10/20], Internet <URL: http: / 1 www.nttdocomo-h.co.jp/houjin/ noujin.css Non-patent document 2: "Simple IMCS", section of the simplified IMCS device configuration diagram of the product's service tab, [online], docomo engineering, [03/10/20], Internet

URL: http / 1 www.nttdocomo.co.jp/ goods / imcs / gaiyou.htmi

Non-Patent Document 3: "GSM Subscriber Trends by Region", [online], [04/10/4], Internet URL: http // www.dempa.co.jp / oyakudati / data / 03011701b .pdf>

Disclosure of the invention

Problems to be solved by the invention

In the conventional private mobile communication system shown in FIG. 19, for example, the private base station apparatus 401 connected to the PDC network and the private base station apparatus 411 connected to the PHS network are completely independent. .

Therefore, mobile communication terminals of the same communication system can communicate with each other using the PBX function provided in each of the local base station devices 401 and 411, whereas, for example, the mobile communication terminal of the PDC system An extension call cannot be realized between the terminal and the PHS mobile communication terminal, even though each subscriber is on the premises. In this case, a communication path connecting both the PDC-based local base station apparatus 401 and the PHS-based local base station apparatus 411 via the corresponding dedicated line and the public network wireless base stations 405 and 413 is formed. Will be done.

[0013] Further, the cost required for installing and maintaining a dedicated line is one of the issues. For example, at the moment when the transition to the 3rd generation is expected, the 3rd generation mobile communication terminal can be expected to be a major target in the future, so a dedicated line for connecting to the IMT-2000 network is prepared. It would be more advantageous to construct a mobile communication system. However, at present, when the number of mobile communication terminals conforming to the IMT-2000 system is small, the cost of installing and maintaining dedicated lines, which is expected to increase in the future, is not seen in the merit obtained by operating the private mobile communication system. It is possible that they do not match. Furthermore, it is clear that users of PDC-type mobile communication terminals that have fallen out of the service target of the private mobile communication system feel dissatisfied. Nevertheless, given the situation in which the generation change of the mobile communication system has already begun, a private mobile communication system targeting PDC mobile communication terminals will be added to the private mobile communication system for the IMT-2000 system, Furthermore, this PDC Installation of a new dedicated line between the private mobile communication system for the ceremony and the PDC network may be a wasteful investment. This is because when the generation change to the third generation mobile communication system is completed, the private mobile communication system for the PDC system and the dedicated line connecting it to the PDC network may become useless. Because.

[0014] Similarly, in the overseas phase of the transition from the GSM system to the IMT-2000 system, the GSM system is expected to become the mainstream in addition to the private mobile communication system for the IMT-2000 system. These facilities operate effectively against the cost of installing a private mobile communication system for the GSM system and installing a dedicated line between the GSM public mobile communication system and the GSM public network. It cannot be expected that the effects obtained in the same period will be balanced.

[0015] The present invention provides a premises base station apparatus capable of effectively utilizing resources such as a signal transmission path in response to a change in traffic bias accompanying the progress of generational change in a communication system, and a mobile station. An object is to provide a private mobile communication system to which a private base station device is applied.

Means for solving the problem

FIG. 1 shows the principles of a private communication system and a private base station device according to the present invention. In FIG. 1, a first private mobile communication system according to the present invention comprises an antenna 101, a private base station device 102, The local base station device 102 is configured to include a relay unit 111, a communication path forming unit 112, and a signal converting unit 113.

The principle of the first private mobile communication system according to the present invention is as follows.

[0017] A premises base station device 102 provided in a premises mobile communication system that mediates communication between mobile communication terminals existing on the premises and terminal devices connected to the public network via an antenna 101 installed on the premises. The relay means 111 communicates with a base station of a public network operating according to a predetermined communication method in response to all outgoing requests to the public network received via a plurality of subscriber interfaces respectively corresponding to different communication methods. It relays outgoing requests by substituting outgoing requests to the public network through a base station interface that sends and receives wired or wireless signals between them. The communication path forming means 112 It forms a communication path between the subscriber interface corresponding to the communication terminal and the base station interface. The signal converting means 113 converts a signal transferred via a communication path according to a coding system applied to a subscriber interface corresponding to the originating mobile communication terminal and a base station interface in the corresponding communication system. Are mutually converted.

[0018] The operation of the first private mobile communication system thus configured is as follows.

When an outgoing call request to an external terminal is sent by a mobile communication terminal existing on the premises, a predetermined interface is transmitted by the relay means 111 regardless of the communication method of the subscriber interface to which the outgoing request arrives. An outgoing request to the public network corresponding to this base station interface is made via the base station interface. In this way, by proxying the transmission request to the public network in place of the mobile communication terminal of the relay means 111, the base station interface provided in the local base station apparatus 102 regardless of the communication method of the transmission source. An outgoing call request can be sent to an external public network using the ace. In addition, a signal transmitted and received by the communication path forming means 112 via the communication path formed between the subscriber interface corresponding to the originating mobile communication terminal and the base station interface is encoded by the signal conversion means 113. The difference between the coding method applied to the mobile communication terminals on the premises and the communication method selected as the communication method used for connection to the public network! / Absorb.

In FIG. 1, the second private mobile communication system according to the present invention includes an antenna 101 and a private base station device 102, and the private base station device 102 includes a relay unit 114, a communication path It comprises a forming means 112 and a signal converting means 113.

The principle of the second private mobile communication system according to the present invention is as follows. The relay is performed by a local base station device 102 provided in a local mobile communication system that mediates communication between mobile communication terminals existing on the premises and terminal devices connected to the public network via an antenna 101 installed on the premises. Means 114 responds to all outgoing requests for mobile communication terminals existing on the premises received via the subscriber interfaces corresponding to the different communication schemes, via the subscriber interface corresponding to the destination mobile communication terminal. The call request is relayed by acting on behalf of the call request to the destination mobile communication terminal. The communication path forming means 112 includes a subscriber interface corresponding to the originating mobile communication terminal. A communication path is formed between the ACE and the subscriber interface corresponding to the destination mobile communication terminal. The signal conversion means 113 converts the communication path according to the coding scheme applied to the communication interface corresponding to the subscriber interface corresponding to the source mobile communication terminal and the subscriber interface corresponding to the destination mobile communication terminal. To convert the signals transferred through each other.

[0020] The operation of the second private mobile communication system thus configured is as follows.

An outgoing call request is sent to a mobile communication terminal that is also present on the premises by a mobile communication terminal that is present on the premises, and when the call reaches a subscriber interface that supports the same communication method as that of the originating mobile communication terminal, the relay means 114 An outgoing request is made to the destination terminal device via the subscriber interface corresponding to the communication method of the destination mobile communication terminal. In this way, the relay unit 114 substitutes for a call request to the destination mobile communication terminal on behalf of the source mobile communication terminal, thereby supporting the destination communication method regardless of the type of the source communication method. An outgoing call request can be sent to the destination mobile communication terminal via the subscriber interface. A signal transmitted and received by the communication path forming means 112 via a communication path formed between the subscriber interface corresponding to the mobile communication terminal of the transmission source and the subscriber interface corresponding to the mobile communication terminal of the destination. The code conversion is performed by the signal conversion means 113 to apply the code to the source mobile communication terminal, and apply the code to the destination mobile communication terminal. Absorb the difference from the signal system.

In FIG. 1, a third private mobile communication system according to the present invention includes an antenna 101 and a private base station device 102, and the private base station device 102 includes a relay unit 111, a communication path And forming means 112.

The principle of the third private mobile communication system according to the present invention is as follows. The relay is performed by a local base station device 102 provided in a local mobile communication system that mediates communication between mobile communication terminals existing on the premises and terminal devices connected to the public network via an antenna 101 installed on the premises. In response to all outgoing requests to the public network received via a plurality of subscriber interfaces respectively corresponding to a plurality of different communication systems, the means 111 converts a predetermined communication system in which a plurality of communication systems and a coding system are common. Subordinate It relays outgoing requests by acting on behalf of outgoing requests to the public network via a base station interface that transmits and receives wired or wireless signals to and from the operating public network base station. The communication path forming means 112 forms a communication path connecting the subscriber interface corresponding to the originating mobile communication terminal and the base station interface.

[0022] The operation of the third private mobile communication system thus configured is as follows.

The relay means 111 receives a call request from a mobile communication terminal (for example, a GSM mobile communication terminal) existing on the premises, regardless of the type of the subscriber interface to which the call request arrives, and allows the local mobile communication system to communicate with the outside. Via a base station interface corresponding to the communication system selected for connection of the IMT-2000 system (for example, the IMT-2000 system), the transmission request described above is sent to the corresponding public network (for example, the IMT-2000 public network). Send out. At this time, the communication path forming means 112 sets a communication path connecting the subscriber interface from which the transmission request has been detected and the above-described base station interface. In this case, since the coding method used in the mobile communication terminal existing on the premises and the communication method selected for connection with the outside are adopted and the same coding method is used, it is formed as described above. There is no need to perform signal conversion on the coding method for the signal passing through the communication channel. Therefore, as described above, in response to an outgoing request from a GSM subscriber terminal existing on the premises, the base station interface of the IMT-2000 system prepared in the premises base station device 102 of the premises mobile communication system. By relaying outgoing requests to the public network using, a connection service to mobile communication terminals connected to an external IMT-2000 public network can be realized.

In FIG. 1, a fourth private mobile communication system according to the present invention includes an antenna 101 and a private base station device 102. The private base station device 102 includes a relay unit 111, a communication path And forming means 112.

The principle of the fourth private mobile communication system according to the present invention is as follows. The relay is performed by a local base station device 102 provided in a local mobile communication system that mediates communication between mobile communication terminals existing on the premises and terminal devices connected to the public network via an antenna 101 installed on the premises. Means 114 receives at least via a plurality of subscriber interfaces provided for each of a plurality of types of communication systems having a common coding system. In response to all outgoing requests to mobile communication terminals existing in the same premises, the outgoing requests are relayed by acting on behalf of the outgoing request to the destination mobile communication terminal via the subscriber interface corresponding to the destination mobile communication terminal. I do. The communication path forming means 112 forms a communication path connecting the subscriber interface corresponding to the source mobile communication terminal and the subscriber interface corresponding to the destination mobile communication terminal.

The operation of the fourth private mobile communication system thus configured is as follows.

The relay means 114 is configured to join a call request from a mobile communication terminal (for example, a GSM mobile communication terminal) existing on the premises to a mobile communication terminal (for example, an IMT-2000 mobile communication terminal) also existing on the premises. When it reaches the user interface, it sends a call request to the destination mobile communication terminal via the subscriber interface corresponding to the destination mobile communication terminal. At this time, the communication path forming means 112 sets a communication path connecting the subscriber interface for which the call request has been detected and the subscriber interface corresponding to the destination mobile communication terminal. In this case, since the coding system used in the mobile communication terminal existing in the premises and the coding system used in the subscriber interface corresponding to the destination mobile communication terminal are common, the communication system is formed by the communication path forming means 112. There is no need to perform signal conversion on the coding method for the signal passing through the communication channel. Therefore, as described above, it is possible to realize the extension connection service between the GSM mobile communication terminal existing on the premises and the IMT-2000 mobile communication terminal existing on the premises as well.

In FIG. 1, a first local base station apparatus 102 according to the present invention includes a relay unit 111, a communication path forming unit 112, and a signal converting unit 113.

The principle of the first local base station device according to the present invention is as follows. In the premises base station device provided in the premises mobile communication system that mediates communication between mobile communication terminals existing on the premises and terminal devices connected to the public network, the middle joint stage 111 is adapted to the first communication method. Base station interface that transmits and receives wired or wireless signals to and from a public network base station that operates according to another second communication method in response to an outgoing request to the public network received via the corresponding subscriber interface It relays outgoing requests by acting on behalf of outgoing requests to the public network via. Communication path formation Stage 112 forms a communication path between the subscriber interface and the base station interface. The signal conversion means 113 mutually converts signals transferred via the communication path according to a coding scheme applied to each of the first communication scheme and the second communication scheme.

[0026] The operation of the first local base station apparatus configured as described above is as follows.

In response to an outgoing call request to the subscriber interface corresponding to the first communication method, the middle joint stage 111 substitutes the transmission of the outgoing call request to the public network via the base station interface corresponding to the second communication method. . In addition, the signal conversion unit 113 performs conversion processing related to the encoding method on the signal transmitted through the communication path formed by the communication path formation unit 112 between the above-described subscriber interface and the base station interface. This absorbs the difference between the coding scheme applied to the first communication scheme and the coding scheme applied to the second communication scheme.

In FIG. 1, the second local base station apparatus 102 according to the present invention includes an estimating unit 115, a selecting unit 116, a relay unit 111, a communication path forming unit 112, and a signal converting unit 113. It is composed.

The principle of the second local base station device according to the present invention is as follows. In a premises base station device provided in a premises mobile communication system that mediates communication between mobile communication terminals existing on the premises and terminal devices connected to a public network, the estimating means 115 uses a plurality of different types of communications. A plurality of base station interfaces based on signals transmitted and received by a plurality of base station interfaces respectively transmitting and receiving wired or wireless signals to and from a plurality of public network base stations operating in accordance with the respective systems. The communication quality that can be expected when a transmission path is set via the communication is estimated. The selecting means 116 is configured to output the estimating means 115 in response to all outgoing call requests to the public network received via a plurality of subscriber interfaces which respectively transmit and receive wireless signals according to a plurality of types of communication methods via the antenna 101. Based on the estimation result by, the base station interface to be used for transmission to the public network is also selected for the medium power of multiple base station interfaces. The relay unit 111 substitutes for a call request to the corresponding public network via the base station interface selected by the selection unit 116. The communication path forming means 112 includes a subscriber interface corresponding to the originating mobile communication terminal and the base station selected by the selecting means 116. Form a communication path connecting to the interface. The signal conversion means 113 converts, for a signal transferred via the communication path, a code system applied in the communication system of the source mobile communication terminal and a code system applied in the communication system corresponding to the selected base station interface. Convert to and from system.

[0028] The operation of the second local base station apparatus thus configured is as follows.

The estimating means 115 estimates, for example, the communication quality that can be expected at appropriate intervals for each base station interface, and provides the estimation result as an index for the base station interface selecting process by the selecting means 116. When a call request arrives at one of the subscriber interfaces provided in the local base station apparatus, the selecting means 116, based on the result of estimation by the estimating means 115, determines the highest possible communication quality. Select the base station interface corresponding to. In response, the relay unit 111 relays the above-mentioned transmission request to the corresponding public network via the base station interface. At this time, the communication path forming means 112 forms a communication path connecting the subscriber interface corresponding to the originating mobile communication terminal and the selected base station interface, and signals are transmitted via this communication path. In the course of transmission, the signal conversion means 113 performs an appropriate conversion on the coding system. As a result, the signal from the source mobile communication terminal is converted according to the coding method compatible with the selected base station interface and transmitted to the corresponding public network, and the selected base station interface is switched to the public network power. A signal input via the terminal can be converted in accordance with a coding method compatible with the subscriber interface corresponding to the source mobile communication terminal, and can be transmitted to the source mobile communication terminal. In this way, regardless of the communication method supported by the originating mobile communication terminal, communication by connecting to the public network is realized using the communication method that can be expected to have the highest communication quality at that time. be able to.

In FIG. 1, a third local base station apparatus 102 according to the present invention is configured to include a relay unit 111 and a communication path forming unit 112.

The principle of the third local base station device according to the present invention is as follows. In the premises base station device provided in the premises mobile communication system that mediates communication between mobile communication terminals existing on the premises and terminal devices connected to the public network, the middle joint stage 111 is adapted to the first communication method. Public received via the corresponding subscriber interface A base station that transmits and receives a wired or wireless signal to and from a public network base station that operates in accordance with a second communication system having a common first communication system and a different coding system in response to a transmission request to the network It relays outgoing requests by acting on behalf of outgoing requests to the public network via the interface. The communication path forming means 112 forms a communication path connecting the subscriber interface and the base station interface.

[0030] The operation of the third local base station apparatus configured as described above is as follows.

The relay means 111 transmits the outgoing request arriving at the subscriber interface corresponding to the first communication method (for example, GSM method) to the base station interface corresponding to the second communication method (for example, IMT-2000 method). Relay to the public network via At this time, the communication path forming means 112 sets a communication path connecting the subscriber interface from which the transmission request has been detected and the above-described base station interface. In this case, since the coding method used in the mobile communication terminals existing on the premises and the voice coding method used in the communication method selected for connection with the outside are common, the coding method is used as described above. There is no need to perform signal conversion on the encoding method for the audio signal passing through the communication channel. Therefore, as described above, for the signal to which the common coding system is applied, the subscriber interface that has detected the transmission request responds to the local base station apparatus 102 regardless of the type of communication system. By using the prepared base station interface to relay outgoing requests to the public network, it is possible to realize a connection service to terminal devices connected to an external public network.

In FIG. 1, a fourth local base station apparatus 102 according to the present invention is configured to include an estimation unit 115, a selection unit 116, a relay unit 111, and a communication path forming unit 112. The principle of the fourth private base station apparatus according to the present invention is as follows. In the premises base station device provided in the premises mobile communication system that mediates communication between mobile communication terminals existing on the premises and terminal devices connected to the public network via an antenna 101 installed on the premises, an estimating means 115 Is based on signals respectively transmitted and received by a plurality of base station interfaces for transmitting and receiving wired or wireless signals to and from base stations of a plurality of public networks operating according to a plurality of types of communication systems having a common coding scheme. Therefore, when a transmission path is set via multiple base station interfaces, Estimate the expected communication quality. The selecting means 116 is provided by the estimating means 115 in response to all outgoing calls to the public network received via a plurality of subscriber interfaces for transmitting and receiving wireless signals in accordance with a plurality of types of communication systems via the antenna 101. Based on the estimation result, select the base station interface to be used for transmission to the public network from multiple base station interfaces. The relay unit 111 substitutes a transmission request to the corresponding public network via the base station interface selected by the selection unit 116. The communication path forming means 112 forms a communication path connecting the subscriber interface corresponding to the originating mobile communication terminal and the base station interface selected by the selecting means 116.

[0032] The operation of the second local base station apparatus thus configured is as follows.

The estimating means 115 estimates, for example, the communication quality that can be expected at appropriate intervals for each base station interface, and provides the estimation result as an index for the base station interface selecting process by the selecting means 116. When a call request arrives at one of the subscriber interfaces provided in the local base station apparatus, the selecting means 116, based on the result of estimation by the estimating means 115, determines the highest possible communication quality. Select the base station interface corresponding to. In response, the relay unit 111 relays the above-mentioned transmission request to the corresponding public network via the base station interface. At this time, the communication path forming means 112 forms a communication path connecting the subscriber interface corresponding to the mobile communication terminal of the transmission source and the selected base station interface. For example, if a common voice coding scheme (for example, AMR coding) is adopted, such as GSM and IMT-2000, the voice coding scheme applied to each subscriber interface and each base station Since the speech coding method applied to the station interface is common in any combination, there is no need to change the coding method in the process of transmitting the speech signal via this communication path. In this way, for signals to which a common coding method is applied, use the communication method that can be expected to have the highest communication quality at that time, regardless of the communication method supported by the source mobile communication terminal. Thus, communication by connection to the public network can be realized.

FIG. 2 shows another configuration of the private mobile communication system and the private base station apparatus according to the present invention. Here is an example.

In FIG. 2, a fifth private mobile communication system according to the present invention includes an antenna 101 and a private base station device 102. The private base station device 102 includes a plurality of subscriber interfaces 121 and a base station interface. 122, a transmission detection means 123, a switch 124, a setting means 125, a request relay means 126, and a signal conversion means 127.

[0034] The principle of the fifth private mobile communication system according to the present invention is as follows.

Radio signals are transmitted and received between mobile communication terminals existing on the premises via the antenna 101 installed on the premises, and the mobile communication terminals existing on the premises and the mobile communication terminals existing on the premises are connected to the public network. In the local base station apparatus 102 of the local mobile communication system for realizing a communication service with a terminal device, a plurality of subscriber interfaces 121 are connected via the antenna 101 installed on the premises. It transmits and receives wireless signals according to different communication schemes to and from the mobile communication terminal existing in the mobile communication terminal. The base station interface 122 sends and receives wired or wireless signals to and from a public network base station that operates according to a communication method selected from a plurality of communication methods. The transmission detection means 123 detects a transmission request from a mobile communication terminal located on the premises to the public network based on signals transmitted and received by the plurality of subscriber interfaces 121. The switch 124 forms a communication path for exchanging signals between the plurality of subscriber interfaces 121 and the base station interface 122. The setting means 125 sets a communication path connecting the subscriber interface 121 and the base station interface 122 corresponding to the originating mobile communication terminal by the switch 124 in response to the call request detected by the call detection means 123. I do. The request relay means 126 relays the transmission request by acting on behalf of the transmission request to the public network via the base station interface 122 in response to the detection of the transmission request by the transmission detection means 123. The signal conversion means 127 is transferred via the switch 124 in accordance with a coding scheme applied by the subscriber interface 121 and the base station interface 122 connected by the communication path formed in the switch 124, respectively, to the corresponding communication scheme. Signals are mutually converted.

[0035] The operation of the fifth private mobile communication system thus configured is as follows.

The request relay unit 126 is configured to transmit the signal regardless of whether the transmission detection unit 123 detects the transmission request in terms of the transmission / reception capability of the signal via the subscriber interface 121 corresponding to any communication method. An outgoing request from a mobile communication terminal (for example, a PDC mobile communication terminal) that exists within the base station corresponds to the communication system (for example, the IMT 2000 system) selected by the private mobile communication system for connection with the outside. The transmission request is transmitted to a corresponding public network (for example, a public network of the IMT-2000 system) via the interface 122. Further, at this time, the setting means 125 sets a communication path connecting the subscriber interface 121 from which the call request has been detected and the above-mentioned base station interface 122 at the switch 124. Then, in the process of transferring the signal via this communication path, the signal conversion means 127 performs an appropriate signal conversion. In this way, using the base station interface prepared in the local base station apparatus 102 of the local mobile communication system, a connection service to the public network can be realized for the mobile communication terminal of another system existing on the premises. .

In FIG. 2, a fifth local base station apparatus 102 according to the present invention includes a subscriber interface 121, a base station interface 122, a transmission detection means 123, a setting means 125, It is composed of a repeater 126, a signal transfer unit 128, and a signal conversion unit 127. The principle of the fifth local base station apparatus according to the present invention is as follows.

[0037] Radio signals are transmitted and received between mobile communication terminals existing on the premises via an antenna 101 installed on the premises, and the mobile communication terminals existing on the premises and the mobile communication terminals existing on the premises are connected to the public network. In the premises base station device of the premises mobile communication system that mediates communication with a terminal device connected to the premises, the subscriber interface 121 uses a wireless communication according to the first communication method with a mobile communication terminal existing on the premises. Send and receive signals. The base station interface 122 sends and receives wired or wireless signals to and from a public network base station operating according to another second communication method. Transmission detection means 123 is powerful! ] Based on a signal transmitted and received by the incoming interface 121, a mobile communication terminal of the first communication method detects a transmission request to the public network. The setting means 125 sets a communication path connecting the subscriber interface 121 and the base station interface 122 according to the transmission request detected by the transmission detection means 123. The request relay means 126 relays the transmission request by acting on behalf of the transmission request to the public network of the second communication method via the base station interface 122 in response to the detection of the transmission request by the transmission detection means 123. The signal transfer means 128 communicates with the subscriber interface 121 and the base station according to the communication path set by the setting means 125. Transfers signals to and from the interface 122. The signal conversion means 127 mutually converts the signal transferred by the signal transfer means 128 between a coding method applied in the first communication method and a coding method applied in the second communication method.

[0038] The operation of the fifth local base station apparatus configured as described above is as follows.

When a request detection unit detects an outgoing call request from a mobile communication terminal a of a first communication system (for example, a PDC system) existing on the premises, the request relay unit 126 sends the communication method of the source and the destination Irrespective of the communication method of the above, the above-mentioned transmission request is made by substituting the transmission request for the corresponding public network via the base station interface 122 corresponding to the second communication method (for example, the IMT-2000 method). Relay. At this time, the setting means 125 sets a communication route connecting the subscriber interface 121 and the base station interface 122. In the process of transferring the signal by the signal transfer unit 128 via this communication path, the signal conversion unit 127 converts the signal from the mobile communication terminal in the premises received by the subscriber interface 121 to the second communication method. The base station interface 122 converts the signal received via the public network to the base station interface 122 and converts the signal received by the base station interface 122 according to the first communication method. Send to interface 121.

In this way, for example, the service of the private mobile communication system for the PDC mobile communication terminal can be realized by the local base station device 102 having the base station interface 122 compatible with the IMT-2000 standard. it can.

FIG. 3 shows another configuration example of the private base station apparatus according to the present invention.

In FIG. 3, a sixth local base station apparatus 102 according to the present invention includes a plurality of subscriber interfaces 121, a plurality of base station interfaces 122, a switch 124, an estimating unit 133, and an outside line detecting unit 131. , Selection means 134, relay means 132, setting means 125, and signal conversion means 127.

[0040] The principle of the sixth local base station apparatus according to the present invention is as follows.

The plurality of subscriber interfaces exchange radio signals with mobile communication terminals existing on the premises according to different communication methods. The plurality of base station interfaces 122 are based on a plurality of public networks operating according to a plurality of different communication schemes. A wired or wireless signal is transmitted to and received from the base station. The switch 124 forms a communication path for exchanging signals between the plurality of subscriber interfaces 121 and the plurality of base station interfaces 122. The estimating means 133 estimates communication quality that can be expected when a transmission path is set via the plurality of base station interfaces 122, based on signals transmitted and received by the plurality of base station interfaces 122, respectively. The detecting means 131 detects an outgoing call request from a mobile communication terminal located on the premises to the public network based on a signal transmitted and received by the subscriber interface 121. The selection means 134 is a base station used for transmission from the plurality of base station interfaces 122 to the public network based on the estimation result by the estimation means 133 in response to the transmission request detected by the outside line detection means 131. Select interface 122. The relay unit 132 substitutes for a transmission request to the corresponding public network via the base station interface 122 selected by the selection unit 134 in response to the detection of the transmission request by the outside line detection unit 131. The setting means 125 switches the communication path connecting the subscriber interface corresponding to the originating mobile communication terminal and the base station interface selected by the selecting means in response to the detection of the calling request by the outside line detecting means 131. Set in. The signal converting means 127 applies a signal transferred via the switch 124 in a communication method corresponding to the coding method applied in the communication method of the source mobile communication terminal and the selected base station interface 122. Converts between encoding systems.

The operation of the sixth private base station apparatus configured as described above is as follows.

The outgoing call request detected by the outside line detecting means 131 is a base station interface selected according to the expected value of the communication quality estimated by the estimating means 133 irrespective of the communication method of the originating mobile communication terminal, for example, The communication is relayed to the corresponding public network via the base station interface 122 corresponding to the communication system in which the highest communication quality can be expected. At this time, a communication path connecting the subscriber interface 121 corresponding to the communication method of the mobile communication terminal of the transmission source and the selected base station interface 122 is formed by the setting means 125 at the switch 124. In the process of transmitting a signal via the, the signal conversion means 127 performs appropriate conversion on the coding method. As a result, the signal from the source mobile communication terminal conforms to the selected base station interface 122. The signal is converted according to the encoding method and transmitted to the corresponding public network, and the signal input from the public network via the base station interface 122 is transmitted to the subscriber interface 121 corresponding to the mobile communication terminal of the transmission source. It can be converted according to the appropriate coding system and sent to the originating mobile communication terminal. In this way, regardless of the communication method supported by the originating mobile communication terminal, communication by connection to the public network is performed using the communication method that can be expected to have the highest communication quality at that time. Can be realized. Brief Description of Drawings

FIG. 1 is a diagram illustrating the principle of a private mobile communication system and a private base station device according to the present invention.

FIG. 2 is a diagram showing another configuration example of the private mobile communication system and the private base station apparatus according to the present invention.

FIG. 3 is a diagram showing another configuration example of the private base station apparatus according to the present invention.

FIG. 4 is a diagram showing an embodiment of a private mobile communication system according to the present invention.

FIG. 5 is a diagram showing a transmission sequence to a PDC terminal public network.

FIG. 6 is a diagram illustrating an operation of transmitting a call to a PDC terminal to a public network.

FIG. 7 is a diagram illustrating an extension call between a PDC terminal and an IMT2000 terminal.

FIG. 8 is a diagram showing a second embodiment of the private mobile communication system according to the present invention.

FIG. 9 is a diagram illustrating an outside line transmission operation.

FIG. 10 is a diagram showing a calling sequence from an IMT2OOO terminal to a PDC public network.

FIG. 11 is a diagram for explaining connection between an IMT2000 terminal and a PDC public network.

FIG. 12 is a diagram showing a third embodiment of the private mobile communication system according to the present invention.

FIG. 13 is a diagram showing a transmission sequence of a GSM terminal to a public network.

FIG. 14 is a diagram illustrating an operation of transmitting a GSM terminal capability to a public network.

FIG. 15 is a diagram illustrating an extension call between a GSM terminal and an IMT2000 terminal.

FIG. 16 is a diagram showing a second embodiment of the private mobile communication system according to the present invention.

FIG. 17 is a diagram showing an outgoing sequence to the IMT2000 terminal public network.

FIG. 18 is a diagram for explaining connection of an IMT2000 terminal to a public network.

FIG. 19 is a diagram showing a configuration example of a general private mobile communication system. FIG. 20 is a diagram showing an example of a simplified private mobile communication system.

FIG. 21 is a diagram showing transition of subscribers by region of the GSM system.

BEST MODE FOR CARRYING OUT THE INVENTION

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

(First Embodiment)

FIG. 4 shows an embodiment of the private mobile communication system according to the present invention.

The on-premise mobile communication system shown in Fig. 4 realizes internal calls between mobile communication terminals on the premises and external calls using external base stations via antennas installed at various points on the premises. And a local base station device 210.

In the local base station apparatus 210 shown in FIG. 4, a PDC modem 211 exchanges a radio signal with a PDC terminal existing on the premises via the above-described antenna, and on the other hand, an IMT-2000 modem The 212 transmits / receives a radio signal to / from an IMT-2000 terminal existing on the premises via the above-described antenna. In addition, the IMT-2000 base station (BTS) interface 213 shown in FIG. 4 is connected to the public network ΙΜΤ-2000 network 202 [connected to the ΙΜΤ-2000 base station 201 [wireless connection]. Of course, a dedicated line may be laid between the 2000-2000 BTS interface 213 and the ΙΜΤ-2000 base station 201 to establish a wired connection.

In the local base station apparatus 210 shown in FIG. 4, the switch 214 is connected to the PDC modem 211, the P-2000 modem 212, and the P-2000 BTS interface in accordance with an instruction from the call processing processor 215. A communication path for interconnecting the 213 and the voice / packet signal processor (SPU) 218 is formed.

The call processor 215 shown in FIG. 4 terminates communication via the PDC modem 211, the ΙΜΤ—2000 modem 212, and the IMT—2000 BTS interface 213 using the area reserved for each communication in the memory 217. . Further, the call processor 215 refers to the premises HLR 219 via the home location register (HLR) interface 216 and, based on the information stored in the premises HLR 219, encodes the data to be transmitted (for example, , A conversion method for a packet including an audio coding method and a video data), and in accordance with the result, instructs the audio / packet signal processing unit 218 to perform an appropriate conversion processing regarding an audio code and packet processing. I do. Further, in the voice Z packet signal processing unit 218 shown in FIG. 4, the signal conversion control unit 221 responds to the above-mentioned voice code conversion instruction from the call processor 215 to perform PDC voice coding. VSELP codec 222 that supports the Vector-Sum Excited Linear Predictive Coding (VSELP) method and AMR codec 223 that supports the AMR (Adaptive MultiRate) method that is the IMT-2000 speech coding method. , And performs a conversion of the encoding method of the audio signal transmitted via the communication path set in the switch 214. Of course, the bucket signal transmitted via the above-described communication path is subjected to conversion processing in accordance with the above-mentioned conversion instruction regarding the packet processing by the audio Z packet signal processing unit 218.

Next, the operation of the private mobile communication system according to the present invention will be described by taking, as an example, the case of relaying an outgoing call relating to a voice call from a PDC terminal existing on the premises to an external public network.

FIG. 5 shows a transmission sequence from the PDC terminal to the public network. FIG. 6 is a diagram illustrating the operation of transmitting a call from the PDC terminal to the public network.

As shown in FIG. 5, the PDC terminal transmits a radio status report to the local base station apparatus (indicated as a local BTS in FIG. 5) and the identification information indicating the destination, for example, when connected to an external public network. When the SETUP message including the telephone number indicating the terminal arrives at the PDC modem 211 shown in FIG. 4, this message is detected by the call detection unit 224 of the call processing processor 215 as shown in FIG. 225 is notified.

[0048] As described above, when a SETUP message including a telephone number indicating an external terminal is detected, the relay control unit 225 refers to the local HLR 219 via the HLR interface 216, and Since it can be confirmed that it does not exist on the premises, relay processing for outgoing calls is started.

At this time, the central control unit 225 causes the protocol conversion unit 228 shown in FIG. 6 to proceed with PDC authentication processing (see FIG. 5) with the source PDC terminal via the PDC modem 211. At the same time, in the local base station apparatus 210, the I-2000 BTS interface 213 prepared as a base station interface for external connection is used to perform the authentication processing of the I-2000 method with the I-2000 public network 202 (see FIG. (See 5). [0049] Subsequently, the relay control unit 225 proceeds with the PDC channel setting process (see Fig. 5) with the source PDC terminal via the protocol conversion unit 228 and the PDC modem 211, and Through the protocol conversion unit 228 and the IMT-2000 BTS interface 213, the IMT-2000 system channel setting processing (see FIG. 5) is performed between the IMT-2000 public network 202 and the IMT-2000 public network 202.

[0050] In this manner, a wireless channel between the local base station apparatus 210 and the IMT-2000 public network 202 and a wireless channel between the local base station apparatus 210 and the source PDC terminal are set. After that, as shown in FIG. 6, the relay control unit 225 controls the switch 214 via the communication channel control unit 226, and transmits the IMT-2000BTS interface from the PDC modem 211 via the voice Z packet signal processing unit 218. In addition to setting a communication path to 213, the voice Z packet signal processing unit 218 is provided with a voice coding scheme compatible with the PDC scheme and a voice coding scheme compatible with the IMT-2000 scheme. Instruct conversion. In FIG. 6, a communication path connecting PDC modem 211 and voice Z-packet signal processing unit 218, an IMT 2000BTS interface 213 and a voice Z-packet signal processing unit The switch 214 is shown separately from the communication path connecting the 218 to the communication path.

After the communication path is formed by the switch 214 in this way, the signal that the PDC terminal power has reached the PDC modem 211 is transmitted via the switch 214 and the VSELP codec 222 of the voice Z packet signal processing unit 218. Is decoded by Then, by the signal conversion control unit 221, the signal is transmitted to the ARM codec 223, encoded by the ARM codec 223, transmitted again to the IMT-2000BTS interface 213 via the switch 214, and transmitted to the IMT-2000BTS The interface 213 transmits the radio signal to the IMT-2000 base station 201 as an IMT-2000 wireless signal. Of course, the radio signal arriving at the IMT-2000 BTS interface 213 of the local base station apparatus 210 from the IMT-2000 public network 202 via the IMT-2000 base station 201 is subjected to voice coding conversion reverse to the above-described route. After being subjected to the processing, it is sent to PDC modem 211, and sent out as a PDC wireless signal from PDC modem 211.

As described above, according to the private mobile communication system including the private base station apparatus according to the present invention, If the PDC modem, which is the subscriber interface, terminates the signal of the mobile communication terminal on the premises, converts it appropriately, relays it to the external public network, and prepares to connect to the public network. Even if the communication method applied to the base station interface is different from the communication method of the mobile communication terminal that requests outgoing calls from the premises, an outside line connection for voice communication can be realized.

Further, in the private mobile communication system including the private base station apparatus according to the present invention, if the above-mentioned procedure is applied to extension connection, as shown in FIG. It is also possible to realize extension calls.

For example, when the SETUP message including the identification information of the IMT-2000 terminal b existing in the premises from the PDC terminal a shown in FIG. 7 reaches the PDC modem 211, the relay control unit 225 performs appropriate authentication processing. After the completion of the setting, a PDC wireless channel is set up with the source PDC terminal a via the protocol converter 228 and the PDC modem 211, and the IMT-2000 modem 212 is connected via the protocol converter 228 and the IMT-2000 modem 212. — 2000 Set up an IMT-2000 wireless channel with terminal b.

After that, the relay control unit 225 sets a communication path for connecting the PDC modem 211 and the IMT-2000 modem 212 via the voice Z bucket signal processing unit 218 via the communication path control unit 226. At the same time, by instructing the voice Z packet signal processing unit 218 to perform coding conversion processing between the VSELP method and the ARM method, an extension call between the PDC terminal a and the IMT-2000 terminal b can be realized.

[0055] As described above, by applying the technology according to the present invention, the service to the users of PDC terminals, which currently occupy a large number of users, is maintained, and with a view to the future transition to the IMT-2000 system. In addition, it is possible to introduce a private mobile communication system using a private base station device having a base station interface compatible with the IMT-2000 system.

Further, in the process of data transmission via the communication path set in the switch 214 as described above, the voice Z packet signal processing unit 218 performs a conversion process on the packet signal, so that the PDC It is also possible to relay packet communication with IMT-2000 type terminal equipment connected to the premises or to the external public network in the same way as mobile communication terminals. (Second embodiment)

Next, a method of providing a service with good communication quality to users on the premises by using the bias of traffic in the public network that appears with the generation change of the mobile communication system will be described.

FIG. 8 shows a second embodiment of the private mobile communication system according to the present invention.

Note that among the components shown in FIG. 8, components equivalent to those shown in FIG. 4 are denoted by reference numerals shown in FIG. 4, and description thereof will be omitted.

The local base station apparatus 210 shown in FIG. 8 includes a PDCBT S interface 231 and a quality information collection unit 232 in addition to the components shown in FIG.

The PDCBTS interface 231 shown in FIG. 8 has a function of wirelessly connecting to the PDC base station 204 connected to the PDC public network 205. In addition, the quality information collection unit 232 shown in FIG. 8 transmits, as information relating to communication quality from the IMT-2000 BTS interface 213 and PDCBTS interface 231, information relating to regulation notified from the corresponding base station via a common control channel, and The information on the reception level of the signal of the corresponding base station power is collected and notified to the call processor 215.

[0058] Further, based on the information notified from the quality information collecting unit 231, the call processor 215 communicates with a communication system used when a user on the premises makes a call request to the public network as described later. To set the communication path between the subscriber interface corresponding to the originating mobile communication terminal and the base station interface corresponding to the communication method used to connect to the public network, and the processing required to connect to the public network. I do.

[0059] Hereinafter, an operation related to connection with the public network will be described, taking as an example a case where an outgoing call request for a voice call to the public network is made for the IMT-2000 terminal.

FIG. 9 is a diagram for explaining the operation of making a call to the public network. Fig. 10 shows the transmission sequence from the IMT-2000 terminal to the PDC public network. Further, FIG. 11 is a diagram illustrating the connection of the IMT-2000 terminal to the PDC public network.

As shown in FIG. 9, the protocol selection unit 230 provided in the relay control unit 225 of the call processor 215 uses the call requesting power detected by the call detection unit 224, Notification from the quality information collection unit 232 when it is determined that the Based on the received information, a communication method to be used for connection to the public network is selected, and necessary instructions are sent to voice Z-packet signal processing section 218, communication path control section 226 and protocol conversion section 228.

[0061] At this time, the protocol selection unit 230 first determines whether any of the quality information collected for the PDCBTS interface 231 and the IMT-2000 BTS interface 213 includes information indicating that the regulation is applied. It is determined whether or not the restriction is applied to one, and the other communication method is preferentially selected as the communication method for connection to the public network. On the other hand, if the regulations are not applied to either communication method, the information on the reception level included in the quality information is compared, and the communication method with the reception level at which higher communication quality can be expected is obtained. Select as the communication method for connection to the public network. Of course, when comparing the reception levels, in order to compare the reception level of the PDC system and the reception level of the IMT-2000 system on the same basis, the communication quality that can be expected at each reception level is, for example, the human hearing level. Are converted to appropriate evaluation values in accordance with the criteria based on, and these evaluation values are compared with each other.

[0062] When the transition to the third generation mobile communication system is almost completed in the future, the traffic will be largely biased toward the IMT-2000 public network, and rather, there will be a margin in the transmission capacity of the PDC public network. May be. At this time, as shown in FIG. 10, when an outgoing request is made from the IMT-2000 terminal, for example, the quality information collecting unit 232 obtains the quality evaluation value corresponding to the reception level collected for the PDC public network. MT-2000 Since the value is higher than the quality evaluation value corresponding to the received level collected for the 2000 public network, the PDC method is selected as the communication method for connection to the public network by the protocol selection unit 230 described above. Is done.

In this case, in response to an instruction from the protocol selection unit 230, the protocol conversion unit 228 sets up a PDC wireless channel with the PDC public network via the PDCBTS interface 231 and sets the IMT — Set up an IMT-2000 wireless channel with the originating IMT-2000 terminal via the 2000 modem 212 (see Figure 10).

After that, as shown in FIG. 11, the communication path control unit 226 sets a communication path connecting the PDCBTS interface 231 and the IMT-2000 modem 212 via the voice Z packet signal processing unit 218, and , Voice Z packet signal processing unit 218 The IMT-2000 terminal can be connected to the PDC public network by instructing the code conversion process between the RM systems (see FIG. 10).

Of course, in the private mobile communication system shown in FIG. 8, by performing the procedure described in the first embodiment at the time when the PDC terminal is dominant, the outside line transmission from the PDC terminal is performed. It is also possible to transfer to the IMT-2000 public network and realize it.

In addition, even when the PDC terminal and the IMT-2000 terminal are competing with each other, for example, the phenomenon that some transmission capacity of the PDC public network and the IMT-2000 public network has a margin in each time zone is captured. Therefore, these communication methods can be used properly. In addition, when the PDC public network and the IMT-2000 public network are congested to the same degree, the corresponding subscriber interface and base station interface are connected via the switch 214. Thus, connection to the corresponding public network can be realized. At this time, if necessary conditions including matching of secret keys and establishment of frame synchronization are satisfied, the PDC modem 211 and the PDCBTS interface 231 and the IMT-2000 modem 212 and the IM T2000BTS interface 213 are directly connected. It is also possible to set a communication path.

As described above, in the private mobile communication system according to the present invention, regardless of the originating mobile communication terminal, connection is made to the communication type public network that can expect the highest communication quality at the time of a call request. In addition to flexibly responding to changes in the generation of communication systems, it is possible to provide services with higher communication quality to users of local mobile communication services by utilizing the change in traffic bias that occurs with this generation change. it can.

[0067] In the process of data transmission via the communication path set via the voice Z packet signal processing unit 218 in the switch 214 as described above, the packet is processed by the voice Z packet signal processing unit 218. By performing signal conversion processing, packet communication with the destination terminal is realized via the public network of the communication method that can expect the highest communication quality at the time of the transmission request, regardless of the originating mobile communication terminal. can do

(Third embodiment)

Next, in the private branch exchange, GSM subscriber terminals and IMT-2000 This section describes how to connect both subscriber terminals to an IMT-2000 public network via an IMT-2000 base station interface.

FIG. 12 shows a third embodiment of the private mobile communication system according to the present invention.

Note that among the constituent elements shown in FIG. 12, those equivalent to the respective parts shown in FIG. 4 are denoted by the same reference numerals as in FIG. 4, and description thereof will be omitted.

The local base station apparatus 210 shown in FIG. 12 includes a GSM modem 241 instead of the PDC modem 211 shown in FIG. In addition, since the GSM system and the IMT-2000 system share the same voice coding system, the audio Z packet signal processing unit (SPU) 242 shown in FIG. 12 mainly performs packet signal processing. Do.

The GSM modem 241 shown in FIG. 12 transmits and receives a radio signal to and from a GSM terminal existing on the premises via an antenna, similarly to the above-described PDC modem 211 (see FIG. 4).

The operation for connection to the public network will be described below, taking as an example a case where a call request for voice communication to the GSM terminal power public network is made.

FIG. 13 shows a transmission sequence from the GSM terminal to the public network. FIG. 14 is a diagram illustrating a connection from a GSM terminal to a public network.

As shown in FIG. 13, when a service request message (CM Service Request) reaches the GSM modem 241 in the GSM terminal power local base station apparatus (shown as a local BTS in FIG. 13), this message The call is detected by the call detector 224 (see FIG. 14) provided in the processor 215.

When the above-mentioned message includes, as a destination, a telephone number indicating a terminal connected to an external public network, the relay control unit 225 shown in FIG. 14 refers to the local HLR 219 via the HLR interface 216. Then, after confirming that the destination does not exist on the premises, the relay process for outgoing calls is started.

At this time, in response to an instruction from the relay control unit 225, the protocol conversion unit 228 sequentially transmits necessary messages via the IMT-200 OBTS interface 213 according to a connection request procedure for the IMT-2000 public network. Then, it controls the process of relaying the exchange of messages related to authentication and confidentiality processing between the IMT-2000 public network and the GSM terminal (see Fig. 13). Subsequently, in response to an instruction from the relay control unit 225, the protocol conversion unit 228 performs a GSM channel setting process (see FIG. 13) with the source GSM terminal via the GSM modem 241. At the same time, channel setting processing of the IMT-2000 system (see FIG. 13) is performed with the IMT-2000 public network 202 via the IMT-2000 BTS interface 213.

[0073] In this way, a wireless channel between the local base station apparatus 210 and the IMT-2000 public network 202 and a wireless channel between the local base station apparatus 210 and the source PDC terminal are set. After that, the relay control unit 225 controls the switch 214 via the communication path control unit 226, and sets a communication path from the GSM modem 241 to the IMT-2000BTS interface 213 as shown in FIG.

[0074] After the communication path is formed by the switch 214 in this manner, the signal that has reached the GSM modem 241 by the GSM terminal is transmitted to the IMT-2000BTS interface 213 via the switch 214. IMT-2000 BTS interface 213 [From here, it is transmitted to the IMT-2000 base station 201 as an IMT-2000 wireless signal. Of course, the radio signal arriving from the IMT-2000 public network 202 via the IMT-2000 base station 201 to the IMT-2000 BTS interface 213 of the local base station apparatus 210 passes through the GSM modem 241 via the above-described path. The GSM modem 241 sends it as a GSM wireless signal.

As described above, according to the private mobile communication system including the private base station apparatus according to the present invention, the mobile communication system on the premises is controlled by the call processor 215 and the memory 217 on the GSM modem side as the subscriber interface. The communication method applied to the base station interface prepared for connecting to the public network by terminating the signal of the terminal and then relaying to the external public network, and the mobile requesting external line transmission from within the premises Even if the communication method of the communication terminal is different from that of! /, An external call can be realized.

Further, in the private mobile communication system including the private base station apparatus according to the present invention, if the above procedure is also applied to extension connection, as shown in FIG. 15, mobile communication terminals of different communication schemes can communicate with each other. It is also possible to implement an extension call.

For example, when a service request message including the identification information of the IMT-2000 terminal existing on the premises is transmitted from the GSM terminal shown in Fig. 15 and reaches the GSM modem 241 The relay control unit 225 instructs the protocol conversion unit 228 to execute the process of relaying the GSM authentication process and the IMT-2000 authentication process via the GSM modem 241 and the IMT-2000 modem 212. I do. Thereafter, the protocol conversion unit 228 sets a GSM wireless channel with the GSM terminal of the transmission source via the GSM modem 241 according to the instruction from the relay control unit 225, and also sets the GSM wireless channel via the IMT-2000 modem 212. To set up an IMT-2000 wireless channel with the IMT-2000 terminal.

[0077] Thereafter, the relay control unit 225 sets a communication path connecting the GSM modem 241 and the IMT-2000 modem 212 via the communication path control unit 226, so that the GSM terminal and the IM T2000 terminal Extension call can be realized.

As described above, by applying the technology according to the present invention, while maintaining the service to the users of the GSM terminals, which currently occupy a large number of users, the IMT— It is possible to introduce a private mobile communication system using a private base station device equipped with a base station interface compatible with the 2000 system.

Further, as described in the first embodiment, the subscriber interface (eg, GSM modem 241) and the base station interface (IMT-2000 base station interface 213) or destination corresponding to the source are provided. A communication path for connecting a corresponding subscriber interface (for example, IMT-2000 modem 212) via the voice Z packet signal processing unit 231 is set in the switch 214, and the voice Z packet signal processing unit 231 By performing the conversion process on the packet signal, it is possible to realize packet communication between the GSM terminal and the IMT-2000 terminal via an outside line and an inside line.

(Fourth embodiment)

Next, a method of providing services of good communication quality to users on the premises using the bias of traffic in the public network that appears with the generation change from the GSM system to the IMT-2000 system. explain.

FIG. 16 shows a fourth embodiment of the private mobile communication system according to the present invention.

Note that among the constituent elements shown in FIG. 16, those equivalent to the respective parts shown in FIG. 12 or FIG. 8 are denoted by the reference numerals shown in FIG. 12 or FIG. 8, and description thereof will be omitted. The local base station apparatus 210 shown in FIG. 16 is constructed by adding GSM to the components shown in FIG. It comprises a BTS interface 243 and a quality information collecting unit 244.

The GSMBTS interface 243 shown in FIG. 16 has a function of wirelessly connecting to the GSM base station 206 connected to the GSM public network 207. In addition, the quality information collection unit 244 shown in FIG. 16 transmits, as communication-related information from the IMT-2000 BTS interface 213 and the GSMBTS interface 243, information on the base station corresponding to the corresponding base station by a common control channel and information on the corresponding base station It collects information on the reception level of the signal from the station and notifies the call processor 215 of the information.

[0081] Further, based on the information notified from the quality information collection unit 244, the call processor 215 transmits a transmission request from a user on the premises to the public network, as described in the second embodiment. Communication system to be used in connection with the mobile communication terminal of the caller and the setting of a communication path connecting the base station interface corresponding to the communication system used for connection to the public network and the public Performs processing necessary for connection to the network.

That is, as described in the second embodiment, first, the call processor 215 transmits a detected transmission request to a terminal connected to the public network (ie, external line transmission). It is determined whether or not the call is an outside line. If the call is an outside line, a communication method to be used for connection to the public network is further selected based on the information notified from the quality information collection unit 244!

At this time, inside the call processor 215, first, it is determined whether any of the quality information collected for the GSMBTS interface 243 and the IMT-2000BTS interface 213 includes information indicating that the regulation is applied. If the restriction is applied to one of them, the other communication method is preferentially selected as the communication method for connection to the public network. On the other hand, if the regulations are not applied to either communication method, the information on the reception level included in the quality information is compared, and the communication method that can obtain the reception level at which higher communication quality can be expected is obtained. Select as the communication method for connecting to the network. Of course, when comparing the reception levels, in order to compare the reception level of the GSM system with the reception level of the IMT-2000 system on the same basis, the communication quality that can be expected at each reception level is compared to the human hearing, for example. GSMBTS interface 243 and IMT-2000BTS interface 213 are connected to the public network based on the results of comparing these ratings with each other according to the appropriate criteria. Select as the base station interface for connection.

[0083] Hereinafter, the operation related to connection to the public network will be described, taking as an example the case where a call request for voice communication to the public network is made for the IMT-2000 terminal.

FIG. 17 shows a transmission sequence from the IMT-2000 terminal to the public network. FIG. 18 is a diagram illustrating a connection from the IMT-2000 terminal to the public network.

For example, when the transition to the third generation mobile communication system is almost completed in the future, traffic may be heavily biased toward the IM T2000 public network, and there may be some margin in the transmission capacity of the GSM public network. There is. In such a case, as shown in FIG. 17, when an outgoing call request is made from the IMT-2000 terminal, the quality information collection unit 244 obtains a quality evaluation value corresponding to the reception level collected for the GSM public network. It is considered to be higher than the quality evaluation value corresponding to the reception level collected for the MT-2000 public network. Therefore, in such a case, the GSMBTS interface 244 is selected as the base station interface for connection to the public network by comparing the quality evaluation values in the call processor 215 as described above.

In this case, as shown in FIG. 18, in response to an instruction from the relay controller 225 provided in the call processor 215, the protocol converter 228 also provided in the call processor 215 A GSM wireless channel is set up with the GSM public network via the interface 244, and an IMT-2000 wireless channel is sent between the IMT-2000 terminal via the IMT-2000 modem 212. Set.

Thereafter, as shown in FIG. 18, the communication path control unit 226 provided in the call processor 215 sets a communication path connecting the GSMBTS interface 244 and the IMT-2000 modem 212 by setting a communication path. The IMT-2000 terminal can be connected to the GSM public network. Of course, in the private mobile communication system shown in FIG. 16, when the GSM terminal is dominant, the procedure as described in the third embodiment can be used. By performing the above, it is also possible to transfer the outside line from the GSM terminal to the IMT-2000 public network.

[0086] Further, even when the GSM terminal and the IMT-2000 terminal are competing with each other, for example, there is a margin in the transmission capacity of the GSM public network and the IMT-2000 public network for each time zone. It is possible to properly use these communication methods by catching the phenomenon of occurrence. In addition, when the GSM public network and the IMT-2000 public network are equally congested, the corresponding subscriber interface and base station interface are connected via the switch 214. Thus, connection to a corresponding public network can be realized. At this time, if necessary conditions including matching of secret keys and establishment of frame synchronization are satisfied, the GSM modem 241 and the GSMBTS interface 243 and the IMT-2000 modem 212 and the IMT-2000 BTS interface 213 are directly connected. It is also possible to set a communication path.

[0087] As described above, the private mobile communication system according to the present invention is connected to the communication type public network that can expect the highest communication quality at the time of a call request, regardless of the mobile communication terminal of the caller. In addition to flexibly responding to changes in the generation of communication systems, it is possible to provide services with higher communication quality to users of local mobile communication services by utilizing the change in traffic bias that occurs with this generation change. it can.

[0088] As described in the second embodiment, the subscriber interface (for example, GSM modem 241) corresponding to the source and the selected base station interface (IMT-2000 base station interface 213) are selected. The switch 214 sets a communication path for connecting the GSM terminal and the IMT to the GSM terminal by performing a conversion process on the packet signal by the voice Z packet signal processing unit 231. Regarding packet communication by connecting to the public network with 2000 terminals, it is possible to provide a packet communication service of high communication quality using the change in the bias of traffic that occurs with the generation change.

Industrial applicability

[0089] According to the private mobile communication system and the private base station apparatus of the present invention, the private network is connected to the public network via a base station interface of a communication method different from the communication method applied to the subscriber interface corresponding to the subscriber on the private premises. Since a connection mechanism is provided, it is possible to unify the communication method when connecting to an external public network while providing mobile communication terminals of a plurality of communication methods that are present in the premises in a mixed manner as service targets.

[0090] For example, a base station corresponding to a new generation communication system in which the number of terminals is expected to increase in the future. Using the mobile interface, it is possible to provide on-premise mobile communication services to new generation mobile communication terminals as well as mobile communication terminals that are currently at the peak of their penetration rate.

. As a result, it is possible to maintain the service to the majority of existing subscribers while introducing equipment that is compatible with the coming generational change, thereby achieving both efficiency of capital investment and customer satisfaction. it can.

Therefore, according to the present invention, it is difficult to receive a radio signal from an outdoor base station like a building such as a tenant building, an office building, a department store or a hotel, or an underground shopping mall! When a user contracts, regardless of the type of mobile communication service, the same mobile communication service as when outdoors can be provided. In addition, since it is possible to limit the types of base station interfaces to be provided in the private mobile communication system, the cost required for providing the private mobile communication service and the cost for operating this service are required. It is possible to reduce the cost required for. As a result, the cost problem that has been an obstacle to introducing a private mobile communication system can be resolved, so that facilities such as large shopping malls can be used for relatively small shops and restaurants. Thus, the field of application of the private mobile communication system can be expanded.

[0092] Furthermore, by providing a mechanism for selecting the interface that can expect the highest communication quality from a plurality of base stations connected to an external public network, traffic bias due to the change of generation of mobile communication terminals can be reduced. Can respond flexibly to changes.

In other words, while the penetration rate of the new generation mobile communication terminal is low, the transmission request from the old generation mobile communication terminal is also used by the old generation mobile communication terminal by utilizing the excess transmission capacity of the public network corresponding to the new generation communication system. It relays to the public network via the base station interface corresponding to the communication system, and on the other hand, after the margin of the transmission capacity of the public network corresponding to the new generation communication system decreases, It is possible to utilize the surplus transmission capacity expected in the above. In this way, traffic unevenness accompanying the progress of generational change is leveled, and even after the generational change is almost completed, the existing equipment that supports the old generation communication system is effectively used. It comes out.

[0093] Thereby, the private base station apparatus according to the present invention can connect to a public network by selectively using one of a plurality of communication schemes irrespective of the communication scheme of the mobile communication terminal of the transmission source. It is possible for users on the premises to provide services using the connection to the public network by utilizing the margin of transmission capacity in each public network that changes as the generation of mobile communication systems changes. It is possible to improve the communication quality when enjoying.

Claims

The scope of the claims

[1] In a private mobile communication system including a private base station apparatus for relaying communication between mobile communication terminals existing in the private premises and a terminal device connected to a public network via an antenna installed in the private premises,

The premises base station device,

In response to all outgoing requests to the public network received via a plurality of subscriber interfaces respectively corresponding to different communication systems, wired or wireless signals are transmitted to and from a base station of the public network operating according to a predetermined communication system. Relay means for relaying the outgoing call request by acting on behalf of the outgoing call request to the public network via a base station interface for transmitting and receiving

Communication path forming means for forming a communication path connecting the subscriber interface corresponding to the source mobile communication terminal and the base station interface;

A signal for converting a signal transferred via the communication path between the subscriber interface corresponding to the source mobile communication terminal and the base station interface according to a coding scheme applied in a communication scheme corresponding to the subscriber interface. With conversion means

A private mobile communication system, comprising:

[2] A private mobile communication system including a local base station apparatus for relaying communication between mobile communication terminals existing in the local area and terminal apparatuses connected to a public network via an antenna installed in the local area,

The premises base station device,

In response to all outgoing requests for mobile communication terminals existing in the premises received via the subscriber interfaces corresponding to the different communication systems, the destination is transmitted via the subscriber interface corresponding to the destination mobile communication terminal. Relay means for relaying the transmission request by substituting the transmission request for the mobile communication terminal of

Communication path forming means for forming a communication path connecting a subscriber interface corresponding to the source mobile communication terminal and a subscriber interface corresponding to the destination mobile communication terminal;

A subscriber interface corresponding to the source mobile communication terminal and a destination mobile communication terminal; Signal conversion means for mutually converting a signal transferred via the communication path in accordance with a coding system applied to a communication interface corresponding to a subscriber interface corresponding to the communication terminal.

A private mobile communication system, comprising:

[3] A private mobile communication system including a private base station apparatus for relaying communication between mobile communication terminals existing in the private premises and a terminal device connected to a public network via an antenna installed in the private premises,

The premises base station device,

In response to all outgoing requests to the public network received via a plurality of subscriber interfaces respectively corresponding to a plurality of different communication systems, it operates according to a predetermined communication system in which the plurality of communication systems and the encoding system are common. Relay means for relaying the transmission request by substituting a transmission request for the public network via a base station interface for transmitting and receiving a wired or wireless signal to and from a base station of the public network; Communication path forming means for forming a communication path connecting a subscriber interface corresponding to a mobile communication terminal and the base station interface.

A private mobile communication system, comprising:

[4] In a private mobile communication system including a private base station apparatus for relaying communication between mobile communication terminals existing in the above-mentioned premises and a terminal device connected to a public network via an antenna installed in the private premises,

The premises base station device,

In response to all outgoing requests addressed to mobile communication terminals existing in the premises received via a plurality of subscriber interfaces provided for a plurality of types of communication systems having a common encoding system, a destination mobile communication terminal Relay means for relaying the outgoing call request by acting on behalf of the outgoing call request to the destination mobile communication terminal via a subscriber interface corresponding to

Communication path forming means for forming a communication path connecting the subscriber interface corresponding to the source mobile communication terminal and the subscriber interface corresponding to the destination mobile communication terminal. A private mobile communication system, comprising:

[5] A premises base station device provided in a premises mobile communication system that mediates communication between mobile communication terminals existing on the premises and terminal devices connected to the public network,

In response to an outgoing request to the public network received via a subscriber interface corresponding to the first communication method, a wired or wireless signal is transmitted to or from a public network base station operating according to another second communication method. A middle joint stage that relays the outgoing call request by acting on behalf of the outgoing call request to the public network via a base station interface that exchanges

Communication path forming means for forming a communication path connecting the subscriber interface and the base station interface;

Signal conversion means for mutually converting a signal transferred via the communication path according to a coding method applied to each of the first communication method and the second communication method. Premises base station device.

[6] A premises base station device provided in a premises mobile communication system that mediates communication between mobile communication terminals existing on the premises and terminal devices connected to a public network,

Based on signals respectively transmitted and received by a plurality of base station interfaces for transmitting and receiving wired or wireless signals to and from base stations of a plurality of public networks operating according to a plurality of different types of communication systems. Estimating means for estimating communication quality expected when a transmission path is set via a plurality of base station interfaces;

In response to all outgoing requests to the public network received via a plurality of subscriber interfaces respectively transmitting and receiving wireless signals in accordance with the plurality of types of communication systems, the plurality of base stations are based on estimation results by the estimating means. Selecting means for selecting a base station interface to be used for transmission to the public network from the station interfaces;

Relay means for proxying a call request to the corresponding public network via the base station interface selected by the selection means,

Communication path forming means for forming a communication path connecting a subscriber interface corresponding to the source mobile communication terminal and a base station interface selected by the selecting means; For signals transferred via the communication path, the coding method applied in the communication method of the source mobile communication terminal and the communication method corresponding to the selected base station interface are applied. Signal conversion means for mutually converting between encoding methods

A premises base station apparatus comprising:

[7] A premises base station device provided in a premises mobile communication system that mediates communication between mobile communication terminals existing on the premises and terminal devices connected to the public network,

In response to an outgoing request to the public network received via a subscriber interface corresponding to the first communication method, a public operating according to another second communication method having a common coding method with the first communication method. Relay means for relaying the transmission request by substituting a transmission request for the public network via a base station interface for exchanging a wired or wireless signal with a base station of a network;

A premises base station apparatus comprising:

[8] In a premises base station device provided in a premises mobile communication system that mediates communication between mobile communication terminals existing on premises and terminal devices connected to a public network, a plurality of types of codes common to a plurality of types are used. The plurality of base station interfaces are based on signals transmitted and received by a plurality of base station interfaces respectively transmitting and receiving wired or wireless signals to and from a plurality of public network base stations operating according to a communication method. Estimating means for estimating the communication quality that can be expected when a transmission path is set via

A subscriber interface corresponding to the originating mobile communication terminal and the selecting means; And a communication path forming means for forming a communication path connecting to the selected base station interface.

[9] Radio signals are transmitted and received between mobile communication terminals existing in the premises via antennas installed in the premises, and mobile communication terminals existing in the premises and mobile communication terminals existing in the premises communicate with the public. In a private mobile communication system including a local base station device that relays communication with a terminal device connected to a network,

The premises base station device

A plurality of subscriber interfaces for transmitting and receiving wireless signals according to different communication schemes to and from mobile communication terminals existing in the premises via antennas installed in the premises,

A base station interface for exchanging wired or wireless signals with a base station of a public network operating according to a communication system selected from the plurality of communication systems;

Transmission detection means for detecting a transmission request from a mobile communication terminal located on the premises to a public network based on signals transmitted and received by the plurality of subscriber interfaces; A switch forming a communication path for transmitting and receiving signals between the

Setting means for setting, by the switch, a communication path connecting a subscriber interface corresponding to the transmission source mobile communication terminal and the base station interface in response to a transmission request detected by the transmission detection means;

Request relay means for relaying the transmission request by substituting the transmission request for the public network via the base station interface in response to the detection of the transmission request by the transmission detection means;

The subscriber interface and the base station interface, which are connected by a communication path formed in the switch, mutually exchange signals transmitted through the switch according to a coding scheme applied in a corresponding communication scheme. Signal conversion means for converting

A private mobile communication system, comprising:

[10] Wireless communication with mobile communication terminals located on the premises via antennas installed on the premises A base station of a private mobile communication system that transmits and receives signals and mediates communication between mobile communication terminals existing on the premises and between mobile communication terminals existing on the premises and terminal devices connected to a public network. In the device,

A subscriber interface for transmitting and receiving a radio signal according to a first communication method with a mobile communication terminal existing in the premises,

A base station interface for transmitting / receiving a wired or wireless signal to / from a public network base station operating according to another second communication method;

Transmission detection means for detecting a transmission request from the mobile communication terminal of the first communication method to a public network based on a signal transmitted and received by the subscriber interface;

Setting means for setting a communication path connecting the subscriber interface and the base station interface in response to a call request detected by the call detection means;

Request relay means for relaying the transmission request by proxying a transmission request to the public network of the second communication method via the base station interface in response to the detection of the transmission request by the transmission detection means. When,

Signal transfer means for transferring a signal between the subscriber interface and the base station interface according to the communication path set by the setting means;

Signal conversion means for mutually converting a signal transferred by the signal transfer means between a coding method applied in a first communication method and a coding method applied in a second communication method;

A premises base station apparatus comprising:

A plurality of subscriber interfaces for exchanging radio signals with mobile communication terminals existing on the premises according to different communication methods, respectively;

A plurality of base station interfaces for exchanging wired or wireless signals with a plurality of public network base stations each operating according to a plurality of mutually different communication schemes;

A switch forming a communication path for exchanging signals between the plurality of subscriber interfaces and the plurality of base station interfaces;

Based on signals respectively transmitted and received by the plurality of base station interfaces, Estimating means for estimating communication quality that can be expected when a transmission path is set via a plurality of base station interfaces;

Detecting means for detecting a transmission request to the public network from a mobile communication terminal other than the mobile communication terminal located on the premises based on a signal transmitted and received by the subscriber interface;

Selecting means for selecting, from the plurality of base station interfaces, a base station interface to be used for outgoing line transmission based on the estimation result by the estimating means in response to the transmission request detected by the detecting means; ,

Relay means for proxying a transmission request to the corresponding public network via the base station interface selected by the selection means in response to the detection of the transmission request by the outside line detection means;

Setting for setting, in the switch, a communication path connecting a subscriber interface corresponding to the source mobile communication terminal and a base station interface selected by the selection means in response to detection of a call request by the outside line detection means; Means,

In accordance with a signal transferred through the switch, a code applied in a communication method of the source mobile communication terminal and a code applied in a communication method corresponding to the selected base station interface are used. Signal conversion means for mutually converting between systems

A premises base station apparatus comprising: