Abstract:
A base station accommodation method and mobile communication system which allows the installation of many micro-miniature BTS devices are provided. The mobile communication system includes a plurality of base stations which accommodate a plurality of mobile terminals respectively; a plurality of first base station control devices, each of which accommodates a predetermined number of base stations out of the plurality of base stations; and a second base station control device which accommodates the plurality of first base station control devices, wherein each of the plurality of first base station control devices comprises, for supporting information identifying a mobile terminal, a mobile terminal data base to store identification information which identifies a base station to which the mobile terminal is subordinate, and a station data base to store an address of the base station.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2008-070618, filed on Mar. 19, 2008, the entire contents of which are incorporated herein by reference. 
     FIELD 
     The present invention discussed herein is directed to a mobile communication system having a base station and base station control device. 
     BACKGROUND 
     The spread of W-CDMA (Wideband Code Division Multiple System) type mobile communication systems is so obvious that the population coverage of W-CDMA type mobile communication system is nearly 100%. On the other hand, the coverage of W-CDMA type mobile communication system for indoor use is as yet not high. This is because radio waves do not easily enter from outdoors to indoors, and cost is high to install and operate a base station for indoor use. 
     In this environment, a base station (BTS: Base Transceiver Station), called a “femto cell”, which is smaller than a conventional base station, has recently been made available. It is assumed that this micro-miniature base station (hereafter called micro-miniature BTS device) will be used in a home or office, and supports W-CDMA, enables simultaneous communication for about 4 users, and is inexpensive. 
     By installing this micro-miniature BTS device in skyscrapers and in underground facilities which conventional base stations cannot fully cover, indoor coverage can be improved without increasing operation cost. 
     However, for a general mobile communication system depicted as a related art in  FIG. 1 , to control base stations, it is necessary to accommodate base stations BTS # 1 , # 2 , . . . #n by a base station control device (RNC: Radio Network Controller, hereafter called “RNC device”)  1 , which is connected to the core network CN. However the number of base stations BTS # 1 , # 2 , . . . #n which one RNC device  1  can control is limited, and this number is roughly several hundred. 
     First of all, a publically known technology is an invention disclosed in Japanese Laid-open Patent Publication No. 4-337997. 
     The invention disclosed in Japanese Laid-open Patent Publication No. 4-337997 is a communication system using femto cells. For the connection of femto cells, however, only connections between an RNC device and base stations are referred to. 
     Another publically known technology is an invention disclosed in Japanese Laid-open Patent Publication No. 2004-179981. According to this invention, neighborhood mobile terminals form a group, where a plurality of mobile terminals transmit and receive voice and packets as if they are one pseudo-terminal. However, this technology makes mobile terminals “appear” as one terminal at the network side, and in the disclosure of this invention nothing is mentioned on how to manage base stations. 
     Therefore, a new accommodating method is necessary to accommodate many (e.g. several thousand) micro-miniature BTS devices. 
     SUMMARY 
     With the foregoing in view, according to an aspect of the invention, a mobile communication system includes base stations and base station control devices, and has a plurality of base stations accommodating a plurality of mobile terminals respectively, a plurality of first base station control devices accommodating a predetermined number of base stations out of the above mentioned plurality of base stations respectively, and a second base station control device which accommodates the plurality of first base stations control devices. Each of the plurality of first base stations control devices further has, for supporting information to identify a mobile terminal, a mobile terminal data base which stores identification information on a base station to which a mobile terminal is subordinate, and a station data base which stores an address of the base station. 
     The plurality of base stations are micro-miniature base stations, and the plurality of first base station control devices are micro-miniature base station control devices, and the second base station control device is connected to a core network. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed. 
     Additional objects and advantages of the invention (embodiment) will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a general mobile communication system; 
         FIG. 2  is a diagram depicting an embodiment of the mobile communication system; 
         FIG. 3A  shows a connection between the RNC device  1  and micro-miniature BTS control device  2 ; 
         FIG. 3B  shows a connection between the micro-miniature BTS control device  2  and micro-miniature BTS device  3 ; 
         FIG. 4A  is a diagram depicting a sequence example among each device in (1) transmission and other call control processing from mobile terminal  10  and shows the flow of signals from the mobile terminal  10  to the RNC device  1 ; 
         FIG. 4B  is a diagram depicting a sequence example among each device in (1) transmission and other call control processing from the RNC device  1  to mobile terminal  10 ; 
         FIG. 5  shows an example of the header format of MAC Data PDU, which is a signal to be transmitted; 
         FIG. 6  shows a table where the six types of header formats of MAC data PDU are used depending on the type of logical channel and transport channel as shown in  FIG. 5 ; 
         FIG. 7  shows a correspondence of a composing element of the header in  FIG. 5  and its purpose; 
         FIG. 8  is a diagram depicting the information to specify the mobile terminal  10  corresponds to the information element to specify a mobile terminal in the MAC Data PDU; 
         FIG. 9  is an example of the recording format of the mobile terminal data base  240 ; 
         FIG. 10  is a diagram depicting a sequence example among each device in (2) paging (callup) processing to mobile terminal  10 ; 
         FIG. 11  shows an image of the paging signal; 
         FIG. 12  shows the image of the paging signal after sorting; 
         FIG. 13  is an example of image after addition where uncollated mobile terminal IDs (UE-IDs) are attached to the format image after the sorting; 
         FIG. 14  shows the format image where the plurality of uncollated mobile terminal IDs (UE-IDs) are attached to the addresses of the micro-miniature BTS devices; 
         FIG. 15  is a diagram depicting a sequence example among each device in (2) paging (callup) processing to mobile terminal  10 ; 
         FIG. 16A  is a diagram depicting a sequence example among each device in (4) NBAP processing between micro-miniature BTS control device  2  and micro-miniature BTS device  3  and shows the flow of signals from the RNC device  1  to the micro-miniature BTS device  3 . 
         FIG. 16B  is a diagram depicting a sequence example among each device in (4) NBAP processing between micro-miniature BTS control device  2  and micro-miniature BTS device  3  and shows the flow of signals from the micro-miniature BTS device  3  to the RNC device  1 ; and 
         FIG. 17  shows a format image of the NBAP signal. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Embodiments will now be described with reference to the drawings. 
       FIG. 2  is a diagram depicting an embodiment of the mobile communication system. 
     A plurality of mobile terminals are subordinate respectively to a plurality of base station BTSs (# 1  to #n). An example of a plurality of base station BTSs (# 1  to #n) is a micro-miniature base station to which at most several mobile terminals are subordinate respectively. 
     A plurality of base station BTSs (# 1  to #n) are connected to first base station control devices  2  (# 1  to #n) corresponding to a predetermined number of base station BTSs (# 1  to #n). And micro-miniature base station control devices (micro-miniature BTS control devices) are applied to the plurality of first base station control devices  2 . 
     The plurality of first base station control devices, that is, micro-miniature BTS control devices  2  (# 1  to #N) are connected to a second base station control device (RNC device)  1 . This second base station control device, that is, the RNC device  1 , is a conventional base station control device, and is connected to a core network CN. 
       FIG. 3A  and  FIG. 3B  are diagrams depicting a configuration example and a connection example of the RNC device  1 , micro-miniature BTS control device  2  and micro-miniature BTS device  3  in  FIG. 2  respectively.  FIG. 3A  shows a connection between the RNC device  1  and micro-miniature BTS control device  2 , and  FIG. 3B  shows a connection between the micro-miniature BTS control device  2  and micro-miniature BTS device  3 . 
     In  FIG. 3A , a core network (CN: core network: I in  FIG. 3A ) is a generic phrase referring to a network device that is higher than the RNC device  1  (II in  FIG. 3A ) in the W-CDMA network, performing management of subscriber information, monitoring/managing each network device, and connecting with another network. 
     The RNC device  1  is a device for controlling base stations, distributing signals of call control plane (C-Plane) data (including NBAP data) and user information transmission plane (U-Plane) data. 
     The micro-miniature BTS control device  2  (III in  FIG. 3A ) is a device which can accommodate a plurality of micro-miniature BTS device  3  via the network  100 , such as the Internet, and an interface (IF) with the RNC device  1  is the same as an interface with a regular base station device. 
     The micro-miniature BTS control device  2  has an inter-RNC interface IF  20 , C-Plane data processing unit  21 , U-Plane data processing unit  22 , NBAP signal processing unit  23 , data storage unit  24  and inter-node interface IF  25  as the functional units. 
     The inter-RNC interface IF  20  is an interface (IF) with the RNC device  1 , and transmits/receives signals of the C-Plane data (including NBA data) and U-Plane data. 
     [C-Plane Data Processing Unit  21 ] 
     The C-Plane data processing unit  21  receives a call control signal on a mobile terminal  10  (V in  FIG. 3B ), which is sent from the RNC device  1 , identifies the mobile terminal number, then sends the call control signal to the micro-miniature BTS device  3  to which this mobile terminal  10  is subordinate. The C-Plane data processing unit  21  also sends the C-Plane data which is sent from the micro-miniature BTS device  3  to the RNC device  1 . 
     Now each functional unit of the C-Plane data processing unit  21  will be described. 
     An individual channel signal transmission/reception unit  210  transmits/receives a signal on an individual channel, out of the call control signals transmitted to/received from the RNC device  1 . 
     A common channel signal transmission/reception unit  211  transmits/receives a signal on a common channel, out of the call control signals transmitted to/received from the RNC device  1 . 
     An informative channel signal transmission/reception unit  212  transmits/receives a signal on an informative channel out of the call control signals transmitted to/received from the RNC device  1 . 
     A paging signal transmission/reception unit  213  transmits/receives a signal on a paging (call up) channel out of the call control signals transmitted to/received from the RNC device  1 . 
     A mobile terminal information acquisition unit  214  traces a signal of an individual/common channel transmitted to/received from the individual channel signal transmission/reception unit  210  and the common channel signal transmission/reception unit  211 , and detects setup information on an individual channel which is set in a mobile terminal  10 . Further, the mobile terminal information acquisition unit  214  records this information in a mobile terminal data base  240  of the data storage unit  24 . When a call processing of the mobile terminal  10  ends, the mobile terminal information acquisition unit  214  deletes the setup information on an individual channel from the mobile terminal data base  240 . 
     A destination change unit  215 A/ 215 B determines, for the data transmitted from the RNC device  1 , a user ID (UE-ID: User Equipment IDentification) and a micro-miniature BTS device  3  to which the mobile terminal  10  is subordinate, based on the mobile terminal data base  240  of the data storage unit  24 , and sends the data to the address of this micro-miniature BTS device  3  based on a station data base  241  of the data storage unit  24 . 
     For the data received from the micro-miniature BTS device  3  (IV in  FIG. 3B ), the destination of the data is changed to the address of the RNC device  1 , and the data is transmitted again. 
     A signal reproduction/destination change unit  216  reproduces the received informative signal since the informative signal must be transmitted to all the connected micro-miniature BTS devices  3 , and sends the signal to the destinations written in the station data base  241  of the data storage unit  24 . 
     A signal shaping/destination change unit  217  extracts a paging on a mobile terminal  10  which is subordinate to a connected micro-miniature BTS device  3  from a paging signal received by the paging signal transmission/reception unit  213 , shapes the paging to a paging signal in a unit of the micro-miniature BTS device  3 , changes the destination to each micro-miniature BTS device  3 , and transmits the signal. 
     [U-Plane Data Processing Unit  22 ] 
     The U-Plane data processing unit  22  receives U-Plane data on a mobile terminal  10 , which is sent from the RNC device  1 , identifies the mobile terminal number, then sends the received data to a micro-miniature BTS device  3  to which this mobile terminal  10  is subordinate. The U-Plane data processing unit  22  also sends the U-Plane data sent from the micro-miniature BTS device  3  to the RNC device  1 . 
     Now each functional unit of the U-Plane data processing unit  22  will be described. 
     An individual channel signal transmission/reception unit  220  transmits/receives U-Plane data of an individual channel. A common channel signal transmission/reception unit  221  transmits/receives U-Plane data of a common channel. 
     A destination change unit  222 A/ 222 B determines, for the data transmitted from the RNC device  1 , a user ID and a micro-miniature BTS device  3  to which the mobile terminal  10  is subordinate, based on the mobile terminal data base  240  of the data storage unit  24 , and sends the data to the address of this micro-miniature BTS device  3  based on a station data base  241  of the data storage unit  24 . For the data received from the micro-miniature BTS device  3 , the destination change unit  222 A/ 222 B changes the destination of the data to the address of the RNC device  1 , and sends the data again. 
     [NBAP Signal Processing Unit  23 ] 
     The NBAP signal processing unit  23  performs processing on an NBAP signal, which is a signal subject to base station control, out of C-Plane signals. An NBAP signal transmission/reception unit  230  of the NBAP signal processing unit  23  transmits/receives the NBAP signal. 
     A destination change unit  231  determines, for the data transmitted from the RNC device  1 , a target micro-miniature BTS device  3  based on the mobile terminal data base  240  of the data storage unit  24  and the station data base  241  of the data storage unit  24 , and sends the data to the address of this micro-miniature BTS device  3 . For the data received from the micro-miniature BTS device  3 , the destination of the data is changed to the address of the RNC device  1 , and the data is transmitted again. 
     [Data Storage Unit  24 ] 
     The data storage unit  24  stores two types of data: mobile terminal data base  240  and station data base  241 . 
     The mobile terminal data base  240  is a data base storing an identifier (user ID: UE-ID) of a mobile terminal  10 , an IP address of this mobile terminal  10 , an identification ID of a micro-miniature BTS device  3  to which the mobile terminal  10  is subordinate, and other information. This mobile terminal data base  240  is detected by a mobile terminal information acquisition unit, which is not illustrated, in the micro-miniature RNC control device  2 , and is updated and recorded when necessary. 
     The station data base  241  is a data base storing an identification ID and IP address of the micro-miniature BTS device  3 , corresponding cell numbers and other information, and is recorded when the system is installed. 
     [Inter-Node Interface If  25 ] 
     The inter-node interface IF  25  is an interface IF with the micro-miniature BTS device  3 , and transmits/receives signals of the C-Plane data (including NBAP data), U-Plane data and other information. 
     Now a micro-miniature BTS device  3  (IV in  FIG. 3 ) connected with the micro-miniature BTS control device  2  via the Internet network  100  and a configuration example thereof will be described. 
     The micro-miniature BTS device  3  is a base station (BTS: Base Transceiver Station) which accommodates a plurality of mobile terminals  10 , and the differences from a regular base station are as follows. 
     The number of mobile terminals that can be accommodated is few (about 10 units). A regular base station can connect and accommodate several hundred mobile terminals. 
     The number of cells is few (about 1 cell). A regular base station has around 3 to 24 cells. 
     The radio wave coverage range is narrow (about several tens m). But is about 3 km in the case of a regular base station. 
     The micro-miniature BTS device  3  has an inter-node interface IF  30 , a C-Plane data processing unit  31 , a U-Plane data processing unit  32 , an NBAP signal processing unit  33  and a radio processing unit  34 . 
     Now each functional unit of the micro-miniature BTS device  3  will be described in details. 
     [Inter-Node Interface IF  30 ] 
     The inter-node interface IF  30  is an interface IF with a micro-miniature BTS control device  2 , and transmits/receives signals of the C-Plane data (including NBAP data), U-Plane data and other information. 
     [C-Plane Data Processing Unit  31 ] 
     The C-Plane data processing unit  31  of the micro-miniature BTS device  3  receives a call control signal on a mobile terminal  10 , which is sent from the micro-miniature BTS control device  2 , and sends the signal to this mobile terminal  10 . The C-Plane data processing unit  31  also sends C-Plane data, which is sent from a mobile terminal  10  to the micro-miniature BTS device  3 , to the micro-miniature BTS control device  2 . 
     Operations of the functional units of the C-Plane data processing unit  31  are as follows. 
     An individual channel signal transmission/reception unit  310  transmits/receives signals on an individual channel, out of call control signals which are transmitted to/received from the micro-miniature BTS control device  2 . 
     A common channel signal transmission/reception unit  311  transmits/receives signals on a common channel, out of the call control signals which are transmitted to/received from the micro-miniature BTS control device  2 . 
     An informative channel signal transmission/reception unit  312  transmits/receives signals on an informative channel, out of the call control signals which are transmitted from the micro-miniature BTS control device  2 . 
     A paging signal transmission/reception unit  313  transmits/receives signals on a paging (call up) channel, out of the call control signals which are transmitted from the micro-miniature BTS control device. 
     [U-Plane Data Processing Unit  32 ] 
     The U-Plane data processing unit  32  receives U-Plane data on a mobile terminal  10 , which is sent from the micro-miniature BTS control device  2 , then sends the data to a mobile terminal  10 . The U-Plane data processing unit  32  also sends U-Plane data sent from a mobile terminal  10  to the micro-miniature BTS control device  2 . 
     An individual channel signal transmission/reception unit  320  of the U-Plane data processing unit  32  transmits/receives U-Plane data of an individual channel. A common channel signal transmission/reception unit  321  transmits/receives the U-Plane data of a common channel. 
     [NBAP Signal Processing Unit  33 ] 
     The NBAP signal processing unit  33  performs processing on an NBAP signal, which is a signal subject to base station control, out of C-Plane signals. 
     An NBAP signal transmission/reception unit  330  of the NBAP signal processing unit  33  transmits/receives the NBAP signal. An NBAP signal processing unit  331  is a component which actually processes an NBAP signal (signal termination unit). 
     [Radio Transmission/Reception Processing Unit (RF/Base Band Processing Unit)  34 ] 
     A radio transmission/reception processing unit  34  is an interface with a mobile terminal  10 , and transmits/receives signals of C-Plane data and U-Plane data. 
     [Mobile Terminal  10 ] 
     A mobile terminal  10  is a terminal used by a user, and is a call processing termination component. 
     A flow of signal processing in the configuration of the above mentioned embodiment of the mobile communication system will now be described. 
     The flow of signal processing is classified into the following four operations. 
     [(1) transmissions and other call control processing from mobile terminal  10 ] 
     [(2) paging (callup) processing to mobile terminal  10 ] 
     [(3) informative data processing to mobile terminal  10 ] 
     [(4) NBAP processing between micro-miniature BTS control device  2  and micro-miniature BTS device  3 ] 
     These four signal processing operations respectively will now be described in detail. 
     In (1) transmissions and other call control processing from mobile terminal  10 , transmission and other call control processing are performed between a mobile terminal  10  and RNC device  1  (or higher device). In this case, various signals are processed in the micro-miniature BTS device  3  and micro-miniature BTS control device  2 . 
       FIG. 4A  and  FIG. 4B  are diagrams depicting a sequence example among each device in (1) transmission and other call control processing from mobile terminal  10 . 
     In  FIG. 4A , the reference symbols Si to Sv show the flow of signals from the mobile terminal  10  to the RNC device  1 . 
     Si: a transmission signal is sent from the mobile terminal  10  to a functional unit corresponding to the logical channel/transport channel, that is, a C-Plane or U-Plane data processing unit  31  and  32 , via the radio processing unit  34  of the micro-miniature BTS device  3 . 
     There are 6 types of header formats of MAC data PDU, which is a signal to be transmitted, as shown in  FIG. 5 , and these header formats are used depending on the type of logical channel and transport channel, as the table in  FIG. 6  shows. 
     In the table in  FIG. 6 , column V shows a reference number ( 1 ) to ( 6 ) in  FIG. 5  at a position of a corresponding item.  FIG. 7  shows a correspondence of a composing element of the header in  FIG. 5  and its purpose. Description continues from  FIG. 4A . 
     Sii: The micro-miniature BTS device  3  receives the signal sent in Si using the C-plane or U-Plane data processing unit  31 / 32 , which is a functional unit corresponding to a logical channel/transport channel. Then the micro-miniature BTS device  3  sends the received signal in MAC format to the inter-node interface IF  25  of the micro-miniature BTS control device  2  via the inter-node interface IF  30 . The MAC format, which is transmitted at this time, is shown in  FIG. 5 , as described for Si. 
     If the transmission type between the micro-miniature BTS device  3  and the micro-miniature BTS control device  2  is IP packets at this time, addresses are attached such that the transmission source address becomes the micro-miniature BTS device  3 , and the transmission destination address becomes the micro-miniature BTS control device  2 . 
     Siii: Then the micro-miniature BTS control device  2  receives the transmission signal in Sii using the inter-node interface IF  25 , and sends it to the destination change unit  215 A/B or  222 A/B corresponding to the logical channel/transport channel. 
     If the transmission type between the micro-miniature BTS control device  2  and the RNC device  1  is IP packets at this time, the transmission source address is changed to the micro-miniature BTS control device  2 , and the transmission destination address is changed to the RNC device  1 , and the signal is sent to a higher level transmission/receive units  210  to  212 ,  220  and  221 . 
     Siv: During the processing in Siii, the mobile terminal information acquisition unit  214  acquires information to specify the mobile terminal  10  from the transmitted data, that is, information on UE-ID, address and individual channel, for example. Then the mobile terminal information acquisition unit  214  records the acquired information to specify the mobile terminal  10  to the mobile terminal data base  240  of the data storage unit  24 . If the same data has been recorded, this recording is omitted. If there is a difference, the stored data is updated. 
     For transmission data, there are six types of header formats of MAC Data PDU in  FIG. 5 , as shown in Si, and the information to specify the mobile terminal  10  corresponds to the information element to specify a mobile terminal in the MAC Data PDU, as shown in the table in  FIG. 8 , for example. 
     The correspondence shown in  FIG. 8  is an example, and if an ID is acquired by another method (using the mobile terminal ID for paging in the MAC SDU), the ID is recorded in the mobile terminal data base  240 . 
     If the transmission type between the micro-miniature BTS control device  2  and the RNC device  1  is IP packets, the transmission source address and the port number are also recorded in the mobile terminal data base  240 . If information that a new individual channel (C-Plane/U-Plane) is set is included in the transmission data, UE-ID, IP address and port number of the newly set individual channel are recorded in the mobile terminal data base  240 . 
     An example of the recording format of the mobile terminal data base  240  is shown in  FIG. 9 . 
     If information that an individual channel (C-Plane/U-Plane) is deleted is included in the transmission data, information on the deleted individual channel is deleted from the mobile terminal data base  240 . Even if information on all the individual addresses is deleted, the information on UE-ID itself (the first column in  FIG. 9 ) is not deleted from the data base  240 . 
     Sv: Each channel signal transmission/reception unit which received the data in Sii replaces the transmission destination address with an address to the RNC device  1 , and sends the receive data to the RNC device  1  via the inter-RNC interface IF  20 . 
       FIG. 4B  is a diagram depicting the flow (Svi to Sx) of signals from the RNC device  1  to the mobile terminal  10 . The signal flow will now be described with reference to  FIG. 4B . 
     Svi: A signal transmitted from the RNC device  1  is received by the channel transmission/reception unit  210 / 211 ,  220 / 221 , corresponding to the logical channel/transport channel, via the inter-RNC interface IF  20  of the micro-miniature BTS control device  2 , and is sent to the destination change unit  215 A/B and  222 A/B. 
     Svii: The destination change unit  210 / 211 ,  220 / 221 , which received the transmission signal in Svi, performs processing similar to that in Siii. 
     Sviii: Based on the user ID (UE-ID) specified in Svii, the transmission source address and port number are changed to the information on the micro-miniature BTS control device  2 , and the transmission destination address and port number are changed to the address recorded in the mobile terminal data base  240  if the transmission type between the micro-miniature BTS control device  2  and micro-miniature BTS device  3  is IP packets. If there are a plurality of individual channel addresses, at this time, the transmission destination address is determined using the port number of the receive data. 
     Six: The data updated in Sviii is sent to the micro-miniature BTS device  3  via the inter-node interface IF  25 . 
     Sx: The micro-miniature BTS device receives the signal transmitted in Si via the inter-node interface IF  30 , using the functional unit  31 / 32  corresponding to the logical channel/transport channel, and sends the signal to the mobile terminal  10  via the radio processing unit  30 . 
     In (2) paging (callup) processing to mobile terminal  10 , processing to send the paging signal, which is transmitted from the RNC device  1 , is sent to each micro-miniature BTS device  3 . The paging signal here corresponds to “Paging Type  1  (TM: PCCH)” of the RRC message in 3GPP. 
       FIG. 10  is a diagram depicting a sequence example among each device in (2) paging (callup) processing to mobile terminal  10 . In  FIG. 10 , the reference symbols SIi to SIvii show the flow of signals from the RNC device  1  to the mobile terminal  10 . 
     SIi: A paging signal is sent from the RNC device  1  to the signal shaping/destination change unit  217  via the inter-RNC interface IF  20  in the micro-miniature BTS control device  2 , through the paging signal receive unit  213  of the C-Plane data processing unit  21 . 
     An image of the paging signal is shown in  FIG. 11 .  FIG. 11  shows an image of a MAC SDU, where a plurality of terminal IDs (UE-ID) (II) after the paging header (I) are shown. 
     SIii: The signal shaping/destination change unit  217  decodes the paging signal, and extracts the terminal ID in the paging signal shown in  FIG. 11 . 
     SIiii: The plurality of terminal IDs (UE-ID) extracted in SIii are collated with the mobile terminal data base  240  of the data storage unit  24 , and if a mobile terminal  10  having the applicable ID (UE-ID) is included, the address of the micro-miniature BTS device  3 , to which this mobile terminal  10  is subordinate, is acquired. 
     For example, if the terminal ID is UE=000001, the address of the micro-miniature BTS control device  3  is “10.10.10.1” according to the example of the recording format of the mobile terminal data base  240  shown in  FIG. 9 . 
     SIiv: Mobile terminals  10  which are subordinate to each micro-miniature BTS device  3  acquired in SIiii are sorted (separated), and a paging signal is created corresponding to the micro-miniature BTS device  3 . 
     The image after sorting is shown in  FIG. 12 . Compared with the source data ( 1 ) corresponding to the paging signal image in  FIG. 11 , an address (port number) for each micro-miniature BTS device  3  is attached after the paging header (( 2 ) in  FIG. 12 ). 
     SIv: If an uncollated mobile terminal ID (UE-ID), for which an address of the micro-miniature BTS device was not acquired, exists in SIiv, this uncollated mobile terminal ID (UE-ID) is added after the mobile terminal ID (UE-ID) sorted in SIiv in the paging signal. 
     An image after this addition is shown in  FIG. 13 . In  FIG. 13 , a plurality of uncollated mobile terminal IDs (UE-IDs) are attached to the format image (( 2 ) in  FIG. 13 ) after the sorting shown in  FIG. 12  (( 3 ) in  FIG. 13 ). Thereby the attached plurality of uncollated mobile terminal IDs (UE-IDs), are broadcasted among the micro-miniature BTS devices to which the mobile terminal IDs (UE-IDs) collated in SIiii, are subordinate. 
     SIvi: As SIv shows, when a plurality of uncollated terminal IDs (UE-IDs) are processed, the plurality of uncollated mobile terminal IDs (UE-IDs) are added only to an address of a micro-miniature BTS device to which the collated mobile terminal ID (UE-ID) is subordinate, and are broadcasted. 
     It is also possible that a micro-miniature BTS device, to which the collated mobile terminal ID (UE-ID) is not subordinate, is called up. 
     Therefore, in order to perfect paging processing, the addresses of the micro-miniature BTS devices which are not included in the micro-miniature BTS device list acquired in SIiii (see  FIG. 12 ) are acquired. Then the plurality of uncollated mobile terminal IDs (UE-IDs) are added so that these UE-IDs are broadcasted to the addresses of the micro-miniature BTS devices acquired in SIvi. 
       FIG. 14  shows the format image where the plurality of uncollated mobile terminal IDs (UE-IDs) are attached to the addresses of the micro-miniature BTS devices acquired in SIvi. 
     SIvii: Again referring to  FIG. 10 , the micro-miniature BTS control device  2  sends the paging signals shown in  FIG. 13  and  FIG. 14 , where the uncollated mobile terminal IDs (UE-IDs) are attached in SIv, to the target micro-miniature BTS device  3  via the inter-node interface IF  25 . The micro-miniature BTS device  3  sends the received paging signal to corresponding mobile terminals through the paging signal transmission/reception unit  313 . 
     In (3) informative data processing to mobile terminal  10 , an informative channel signal, which is transmitted from the RNC device  1 , is sent to each micro-miniature BTS device  3 . 
       FIG. 15  is a diagram depicting a sequence example among each device in (2) paging (callup) processing to mobile terminal  10 . 
     SIi: An informative channel signal is sent from the RNC device  1  to the informative channel signal reception unit  212  via the inter-RNC interface IF  20  in the micro-miniature BTS control device  2 . 
     SIIii: Based on the received informative channel signal by the informative channel signal reception unit  212 , the signal reproduction/destination change unit  216  acquires the IP address of the micro-miniature BTS device  3  in the station data base  241  of the data storage unit  24 . 
     SIIiii: The informative signal is reproduced for a number of the acquired IP addresses. 
     SIIiv: The reproduced informative signals are sent to all the acquired IP addresses of the micro-miniature BTS device  3  in the station data via the inter-node interface IF  25 . 
     SIIv: The micro-miniature BTS device  3  which received the informative channel signal using the informative channel signal transmission/reception unit  312  via the inter-node interface IF  30  sends this signal to all the subordinate mobile terminals  10  via the radio processing unit  34 . 
     In (4) NBAP processing between the micro-miniature BTS control device  2  and micro-miniature BTS device  3 , the NBAP signal sent from the RNC device  1  is sent to each micro-miniature BTS device  3 . 
     Here the NBAP signal is a protocol for processing a signal between the RNC device  1  and the base station (Node B). Typical examples of an NBAP signal are “radio link setup request”, “radio link setup response”, “establish request”, “establish confirm”, “radio link deletion request” and “radio link deletion response”. 
     These signals are generated in the call processing step of the mobile terminal  10  (mainly used for such control as bearer addition/delete between the base station and mobile terminal  10 ). Therefore, in order to associate the call processing of the mobile terminal  10  and these NBAP signals, it is necessary to specify information related to the identifier ID of the mobile terminal  10  in the NBAP signal, and route the NBAP signal to the micro-miniature BTS device  3  to which the mobile terminal  10  is subordinate. 
     Therefore, in the following processing content, a processing to extract information on the mobile terminal  10  from the NBAP signal data is performed, in order to implement processing of the NBAP signal appropriately. 
       FIG. 16A  and  FIG. 16B  are diagrams depicting a sequence example among each device in (4) NBAP processing between micro-miniature BTS control device  2  and micro-miniature BTS device  3 . 
       FIG. 16A  shows the flow of signals from the RNC device  1  to the micro-miniature BTS device  3  (SIIII to SIIIv).  FIG. 16B  shows the flow of signals from the micro-miniature BTS device  3  to the RNC device  1  (SIIIvi to SIIIviii). 
     SIIII: In  FIG. 16A , the NBAP signal sent from the RNC device  1  is received by the NBAP signal transmission/reception unit  230  of the NBAP signal processing unit  23  via the inter-RNC interface IF  20  in the micro-miniature BTS control device  2 , and is sent to the destination change unit  231 . 
       FIG. 17  shows a format image of the NBAP signal, and shows a case when the transmission type between the micro-miniature BTS device  3  and micro-miniature BTS control device  2  is IP packets, which are transmitted/received via the Internet network  100 . 
     SIIIii: The destination change unit  231  which received the signal in SIIIi decodes the NBAP data, and acquires information to specify a mobile terminal  10 , and extracts this mobile terminal  10  from the mobile terminal data base  240  of the data storage unit  24 . 
     SIIIiii: The IP address and port number of the micro-miniature BTS device  3 , to which the extracted mobile terminal  10  is subordinate, are acquired from the mobile terminal data base  240 . 
     SIIIiv: The IP address and port number of the NBAP signal acquired in SIIIiii are replaced with those of the micro-miniature BTS device extracted in SIIIii, and sent to the micro-miniature BTS device  3  via the inter-node interface IF  25 . 
     SIIIv: The micro-miniature BTS device  3  receives the IP address and port number of the micro-miniature BTS device acquired in SIIIii, which replaced the IP address and port number acquired in SIIIiii, using the NBAP signal transmission/reception unit  330  of the NBAP signal processing unit  33  via the inter-node interface IF  30 , and performs processing using the NBAP signal processing unit  331 . 
     SIIIvi: IN  FIG. 16B , the NBAP signal processing unit  331  sends an NBAP signal to the NBAP signal processing unit  23  in the micro-miniature BTS control device  2  via the NBAP signal transmission/reception unit  330  according to the processing result of the NBAP signal processing unit  331  in the NBAP processing unit  33  of the micro-miniature BTS device  3 . 
     SIIIvii: The destination of the NBAP signal is changed to the address of the RNC device  1  by the address change unit  231  of the NBAP signal processing unit  33 , which received the NBAP signal transmitted in SIIIvi. In other words, the destination change unit  231  changes the transmission source address of the NBAP signal received from the micro-miniature BTS device  3  to the micro-miniature BTS control device  2 , and changes the transmission destination address thereof to the RNC device  1 . Then the NBAP signal is sent via the NBAP signal transmission/reception unit  230 . 
     SIIIviii: The NBAP signal transmission/reception unit  230  sends the received NBAP signal to the RNC device  1  via the inter-RNC interface IF  20 . 
     As described above, according to the present invention, many micro-miniature BTS devices  3  can be accommodated without modifying a conventional W-CDMA system, at los cost (by merely adding micro-miniature BTS control devices). 
     All examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the principles of the invention and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of the superiority and inferiority of the invention. Although the embodiments of the present invention has been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.