JP2007318241A - Communication system, mobile terminal, exchange station, communication method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication system with a redundant configuration whereby communication paths can uninterruptibly be switched even under a state that a transmission distance between a mobile phone and an exchange station is continually changed because of a continuous change in a position of the mobile phone in use. <P>SOLUTION: In the communication system with the redundant configuration comprising a system wherein a wireless base station 2 and a small-sized base station 3 are provided between the mobile phone 1 and the exchange station 4 and the mobile phone 1 makes wireless communication with the wireless base station 2 by means of a radio wave and a system wherein the mobile phone 1 makes near field wireless communication with the small-sized base station 3 by means of the Bluetooth (R) and a wireless LAN or the like, the mobile phone 1 detects synchronizing states of received signals from both the systems and compares them, corrects the received signals so as to eliminate a reception delay time difference of the received signals, transmits a signal, and when a communication path of the one system is interrupted, the mobile phone momentarily selects a communication path of the other system synchronized with the one system. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a communication system that performs communication between a mobile terminal and an exchange, and more particularly to a communication system, a mobile terminal, an exchange, a communication method, and a program provided with a communication unit having a redundant configuration.

Conventional radio communication systems using cellular phones are mainly made by radio waves between cellular phones and radio base stations. For example, in radio communications between radio waves between cellular phones and radio base stations, TDMA (Time Division Multiplexing) is used. Access) and third-generation CDMA (Code Division Multiple)
Access) method is adopted, and one communication path is allocated when each user communicates with a mobile phone. Recently, with the establishment of a public wireless LAN environment for the Internet on personal computers, mobile phones that support wireless LAN communication have also been realized.

An example of a conventional wireless communication system is disclosed in Japanese Patent Laid-Open No. 2003-047177 (Patent Document 1). A wireless communication system disclosed in Patent Document 1 is a network that connects a mobile terminal 100, a wireless base station 200 that communicates with the mobile terminal 100 in a wireless zone, a wireless base station 200, and a subscriber exchange station described later. A mobile terminal 100 that connects A300, a network B310 that enables communication connection with other communication carriers, a voice storage device 230 that stores voice messages such as answering machine messages, a subscriber switching center 210 and a voice storage device 230 A service control station 220 that manages information transmitted from the subscriber station, a subscriber switching center 210 that manages a plurality of radio base stations 200, and a gateway switching center 240 that receives information from the subscriber switching center 210 and connects different networks. Consists of
Japanese Patent Laying-Open No. 2003-047177 (FIG. 1)

  However, wireless communication is ensured by a communication path with only one line, regardless of whether the communication method using a radio wave with a conventional wireless base station or a communication method using a wireless LAN is used. Is not realized. Therefore, if the radio wave condition to the mobile phone deteriorates due to movement of the mobile phone or the influence of surrounding obstacles, communication will be interrupted during a call, mail transmission / reception, or data communication via the Internet. In some cases, there is a problem that the user of the mobile phone is inconvenienced, for example, it is necessary to redo the call, mail transmission / reception, and browsing processing.

  Also, in a situation where the transmission distance between the mobile phone and the switching center constantly changes due to the constantly changing location of use of the mobile phone, the transmission time of the communication signal between the mobile phone and the switching center is between the mobile phone and the switching center. Since each of the plurality of communication paths is different, there is a problem that it is difficult to establish a redundant configuration of the communication paths.

  An object of the present invention is to provide a communication system having a redundant configuration capable of switching the communication path without interruption even in a situation where the transmission distance between the mobile phone and the switching center constantly changes as the use position of the mobile phone constantly changes, It is to provide a portable terminal, an exchange, a communication method, and a program.

  The present invention provides a communication system for performing communication between a mobile terminal and an exchange via a radio base station, and includes at least two communication means for performing communication between the mobile terminal and the exchange via the radio base station. The at least two systems of communication are synchronized and can be established at the same time.

  According to the above configuration, in communication performed between the mobile terminal and the exchange via the radio base station, if any system communication path is interrupted for some reason, other systems that can be established at the same time in synchronization. The communication path is instantly switched to the communication path.

  According to the present invention, the communication path can be switched without interruption even in a situation in which the transmission distance between the mobile phone and the switching center constantly changes due to the constantly changing use position of the mobile phone.

  The reason for this is that at least two systems of communication means for performing communication between the mobile terminal and the exchange via the radio base station are provided so that at least two systems of communication can be established simultaneously in synchronization, so that the communication channel of any system This is because the communication path is instantaneously switched to a communication path of another system that can be established at the same time even if it is interrupted for some reason.

(First embodiment)
The communication system according to the first embodiment of the present invention includes a wireless communication system using radio waves between a mobile phone and a wireless base station, and a short distance between the mobile phone and a small base station via Bluetooth or a wireless LAN (Local Area Network). Even if communication with one system becomes impossible with a wireless communication system, even if communication with one system becomes impossible, switching to the communication path of the other system with synchronization is made instantaneously, so communication is not interrupted, and calls and the Internet This enables continuous use such as sending and receiving e-mails.

(Configuration of the first embodiment)
FIG. 1 is a block diagram showing a configuration of a communication system according to the first embodiment of the present invention.

  Referring to FIG. 1, the communication system according to the present embodiment includes a mobile phone 1, a small base station 2 having a wireless module 21, a wireless base station 3, an exchange 4, and a communication network 5.

  The mobile phone 1 and the radio base station 3 are connected by radio communication using radio waves, and the radio base station 3 and the exchange 4 are connected by a wired network 6.

  The mobile phone 1 and the small base station 2 are connected by a short-range wireless transmission system such as Bluetooth or wireless LAN, the small base station 2 and the switching center 4 are connected by a wired network 7, and the switching center 4 is Are connected to the communication network 5 by the wired network 8.

  In the present embodiment, a route through which the mobile phone 1 communicates with the exchange 4 via the radio base station 3 is a first system, and a route through which the mobile phone 1 communicates with the exchange 4 via the small base station 2 The second system is assumed.

  That is, of the routes shown in FIG. 1, the route through which the mobile phone 1 communicates with the switching center 4 via radio communication with the radio base station 3 is defined as the first system. A route for communicating with the switching center 4 via the small base station 2 and wireless communication using a short-range wireless transmission method such as Bluetooth or wireless LAN is defined as a second system.

  FIG. 2 is a block diagram showing an internal configuration of the mobile phone according to the present embodiment.

  Referring to FIG. 2, the mobile phone 1 according to the present embodiment is configured such that the call / communication function provided in a general mobile phone and the first system are synchronized between the first system and the second system described above. And a function of communicating with an external device by the second system.

  That is, the cellular phone 1 according to the present embodiment displays a CPU Central Processing Unit (133) provided in a general cellular phone, a transmitter / receiver 131 having a function of exchanging voice with a user of the cellular phone 1, and information. Processing a display unit 132 such as a liquid crystal screen having a function, an antenna 105 having a function of performing radio communication with a radio base station 3 outside the mobile phone 1 by radio waves, and a reception signal from the antenna 105 and a transmission signal to the antenna 105 A transmission / reception processing unit (first system) 104 having a function to perform communication, a wireless module 115 having a function of communicating with the outside of the mobile phone 1 by a short-range wireless transmission method such as Bluetooth or wireless LAN, and reception from the wireless module 115 A transmission / reception processing unit having a function of processing a signal and a transmission signal to the wireless module 115 ( (Second system) 114, synchronization detection unit (first system) 103 having a function of synchronizing the downlink signal, synchronization detection unit (second system) 113, and synchronization detection of the first system downlink A comparison unit 125 having a function of comparing a signal and a downlink signal of the second system and measuring a reception delay time between the downlink signals of the first system and the second system, and the reception measured by the comparison unit 125 From the result of the delay time, the reception signal (downlink) for the downlink signal processing unit (first system) 102 and the downlink signal processing unit (second system) 112 is controlled, and the received signal (downlink) of the first system A delay having a function of correcting the reception delay time difference with respect to the second system received signal (downlink) and matching the timings of the first system received signal (downlink) and the second system received signal (downlink). Uplink signal having a function of controlling the uplink signal from time controller 123 and CPU 133 A processing unit (first system) 101, an upstream signal processing unit (second system) 111, a downstream signal processing unit (first system) 102 having a function of controlling downstream signals, and a downstream signal processing unit (second system) System) 112, a system selection control unit 121 having a function of controlling which one of the first system and the second system of the transmission / reception signal is selected based on a system selection signal from the CPU 133, and a downlink received signal In the first system and the second system, the selection unit 122 having a function of passing one signal selected by the system selection control unit 121 and the system selection signal added by the switching center 4 described later are synchronously detected. A system selection signal detection unit 124 having a function of detecting from a downstream signal from the unit (first system) 103 and a synchronization detection unit (second system) 113 and transmitting it to the CPU 133.

  Here, the hardware configuration of the mobile phone 1 will be described.

  FIG. 3 is a block diagram showing a hardware configuration of the mobile phone of the communication system according to the present embodiment.

  Referring to FIG. 3, the mobile phone 1 according to the present invention can be realized by a hardware configuration similar to that of a general computer device, and is a main memory such as a CPU (1001 (CPU 133), a RAM (Random Access Memory) or the like. Yes, a main storage unit 1002 used for a data work area and a temporary data save area, a communication control unit 1003 (transmission / reception processing unit (first system) 104, transmission / reception processing unit ( (Second system) 114, wireless module 115), display unit 1004 (transmission / reception unit 131, display unit 132) such as a liquid crystal display and speaker, input unit 1005 such as a keyboard and mouse, and transmission / reception of data by connecting to peripheral devices Interface unit 1006, ROM (Read Only Mem) ry), a magnetic disk, an auxiliary storage unit 1007 is a hard disk device formed of a non-volatile memory such as a semiconductor memory, and a system bus 1008 for connecting the above components of the information processing apparatus to each other.

  The cellular phone 1 according to the present invention is implemented by mounting circuit components composed of hardware components such as LSI (Large Scale Integration) in which a program for realizing such functions is incorporated in the cellular phone 1. As a matter of course, it can be realized by software by executing a program for providing each function of each component described above by the CPU 1001 (CPU 133) on the computer processing apparatus.

That is, the CPU 1001 (CPU 133) loads the program stored in the auxiliary storage unit 1007 to the main storage unit 1002, executes it, and controls the operation of the mobile phone 1 to control each function described above in software. Realize.
Note that the switching center 4 to be described later may have the above-described configuration similarly to the mobile phone 1 and may implement each function described above in hardware or software.

  FIG. 4 is a block diagram showing the internal configuration of the exchange in the present embodiment.

  Referring to FIG. 4, switching center 4 in the present embodiment includes CPU 433 and a transmission / reception processing unit (first system) having a function of processing a reception signal from wireless base station 3 and a transmission signal to wireless base station 3. ) 404, a transmission / reception processing unit (second system) 414 having a function of processing a reception signal from the small base station 2 and a transmission signal to the small base station 2, and synchronization detection having a function of synchronizing the uplink signal Section (first system) 403 and synchronization detection section (second system) 413 are compared with the upstream signal of the first system and the upstream signal of the second system, which are synchronously detected, and the delay time is calculated. Based on the result of the delay time calculated by the comparison unit 425 having a function and the comparison unit 425, the uplink signal is controlled by the uplink signal processing unit 402 and the uplink signal processing unit 412, and the uplink signal of the first system Difference in reception delay time for upstream signal of 2 systems Correctly, a delay time control unit 423 having a function of matching the timing of the upstream signal of the first system and the upstream signal of the second system, and a downstream signal processing unit having a function of controlling the downstream signal from the communication network 5 (First system) 401, downlink signal processing unit (second system) 411, uplink signal processing unit (first system) 402 having a function of controlling the uplink signal, uplink signal processing unit (second system) ) 412, a system selection control unit 421 having a function of controlling which one of the first system and the second system of the transmission / reception signal is selected based on the system selection signal from the CPU 433, and the first signal of the upstream signal Among the system and the second system, the selection unit 422 having a function of passing one signal selected by the system selection control unit 421 and the system selection signal added by the mobile phone 1 are synchronized with each other. System) 403, synchronization detector ( And a system selection signal detecting unit 424 having a function of detecting the uplink signal transmitting and to CPU433 from 2 system) 413.

  As described above, the configuration example in the present embodiment has been described. However, the TDMA method or the CDMA method of the communication method in the wireless communication system between the mobile phone 1 and the wireless base station 3 in FIG. The short-range wireless transmission methods such as Bluetooth and wireless LAN are well known to those skilled in the art and are not directly related to the present invention, and thus detailed configuration and description thereof will be omitted.

  (Operation of the first embodiment)

  First, an outline of the operation of the communication system in the present embodiment will be described.

  FIG. 5 is a flowchart showing an outline of the operation of the communication system in the present embodiment.

    Referring to FIG. 5, the communication system having a redundant configuration of the first system and the second system that realizes communication between the mobile phone 1 and the exchange 4 has a good radio wave state in a call or data communication. If there is no problem in the communication state, both the first system and the second system are always operated, and the mobile phone 1 and the switching center 4 respectively detect and compare the synchronization of the received signals from both systems ( In step S501), a signal is transmitted with correction so as to eliminate the reception delay time difference between the received signals (step S502). When it is detected that the communication path of one system is interrupted (step S503), The communication is instantaneously switched to the system route (step S504).

  In the communication system according to the present embodiment, the reception signal finally used by the mobile phone 1 and the exchange 4 is selected as the active system (active system) from the first system or the second system. The signal of the current system is used, and the signal of the non-operational system (standby system) is discarded on the way.

  Next, using FIG. 2, FIG. 4 and FIG. 5, the operation when the mobile phone 1 in the present embodiment performs signal transmission / reception with the exchange 4 will be described.

  First, using FIG. 2 and FIG. 5, an operation when the mobile phone 1 in the present embodiment performs signal transmission / reception will be described.

  First, the operation when the mobile phone 1 according to the present embodiment performs signal transmission / reception with the radio base station 3 wirelessly via the antenna 105 in the first-system communication with the exchange 4. The reception operation of (first system operation) will be described.

  First, in the first system operation, a reception signal (downlink) transmitted from the radio base station 3 and received by the antenna 105 is transmitted via the transmission / reception processing unit (first system) 104. System) 103, synchronized by the synchronization detection unit (first system) 103, and the synchronization detection result of the received signal (downlink) is transmitted to the downlink signal processing unit (first system) 102 and the comparison unit 125. Is done.

  In addition, the received signal (downlink) synchronized by the synchronization detection unit (first system) 103 is extracted from the received signal (downlink) when transmitted to the downlink signal processing unit (first system) 102. The system selection signal is transmitted to the system selection signal detection unit 124.

  Next, in the second communication between the mobile phone 1 and the exchange 4, a short distance such as Bluetooth or wireless LAN between the wireless module 21 of the small base station 2 and the wireless module 115 of the mobile phone 1 is used. Of the operations (second system operations) at the time of signal transmission / reception by the wireless transmission method, the reception operation will be described.

  First, in the second system operation, a reception signal (downlink) received by the wireless module 115 from the small base station 2 is transmitted to the synchronization detection unit (second system) via the transmission / reception processing unit (second system) 114. The synchronization detection unit (second system) 113 is synchronized, and the synchronization detection result of the received signal (downlink) is transmitted to the downlink signal processing unit (second system) 112 and the comparison unit 125. .

  The received signal (downlink) synchronized by the synchronization detection unit (second system) 113 is extracted from the received signal (downlink) when transmitted to the downlink signal processing unit (second system) 112. The system selection signal is transmitted to the system selection signal detection unit 124.

  Here, the operation of the comparison unit 125 will be described.

  FIG. 6 is a diagram for explaining a reception delay time difference when a first system received signal (downlink) and a second system received signal (downlink) are compared.

  The comparison unit 125 that receives the synchronization detection results from the synchronization detection unit (first system) 103 and the synchronization detection unit (second system) 113, as shown in FIG. ) And the second system received signal (downlink), the reception delay time difference T, which is the time difference per frame of the received signal (downlink), is measured, and the measured reception delay time difference T is used as the delay time control unit 123. (See step S501 in FIG. 5).

  Here, the operation of the delay time control unit 123 will be described.

  FIG. 7 is a diagram for explaining the first system received signal (downlink) and the second system received signal (downlink) after correction of the reception delay time difference.

  Based on the reception delay time difference T received from the comparison unit 125, the delay time control unit 123 receives the received signal (downlink) in the downlink signal processing unit (first system) 102 and the downlink signal processing unit (second system) 112. To control.

  More specifically, as shown in FIG. 7, the delay time control unit 123 receives the reception timing to the mobile phone 1 out of the first system received signal (downlink) and the second system received signal (downlink). The reception delay time difference T is corrected (the reception delay time difference T is delayed) with respect to the reception signal (downstream) of the system having a fast delay, and the downstream signal processing unit (first system) 102 and the downstream signal processing unit (second system) are corrected. The timings of the first system received signal (downlink) and the second system received signal (downlink) transmitted from 112 are matched (see step S502 in FIG. 5).

  In addition, the system selection signal detection unit 124 that receives the system selection signal from the first system reception signal (downlink) and the second system reception signal (downlink) performs the first system operation based on the system selection signal. In this state, it is determined whether it is a request for switching to the second system or in the state of the second system operation, a request for switching to the first system, etc., and a system switching request is made to the CPU 133.

  Next, when the CPU 133 receives a switching request from the system selection signal detection unit 124, it makes a system switching request to the system selection control unit 121.

  When the signal from the antenna 105 is not received, the transmission / reception processing unit (first system) 104 determines that the communication with the radio base station 3 has been disconnected, and the first communication with the CPU 133 is determined. Is transmitted (information on the first system communication disconnection) (see step S503 in FIG. 5).

  In this case, when the CPU 133 receives the first system communication disconnection information from the transmission / reception processing unit (first system) 104, the CPU 133 controls the system selection control unit 121 to switch to the second system.

  Similarly, when the signal from the wireless module 115 is not received, the transmission / reception processing unit (second system) 114 determines that short-range wireless communication such as Bluetooth or wireless LAN with the small base station 2 has been disconnected. The CPU 133 is notified that the second system communication has been interrupted (second system communication disconnection information) (see step S503 in FIG. 5).

  In this case, when the CPU 133 receives the second system communication disconnection information from the transmission / reception processing unit (second system) 114, the CPU 133 controls the system selection control unit 121 to switch to the first system.

  Next, the system selection control unit 121 that has received the switching request from the CPU 133 controls the selection unit 122 to switch to the first system or the second system as the active system.

  In response to the switching request from the CPU 133, the system selection control unit 121 instructs the transmission / reception processing unit (first system) 104 or the transmission / reception processing unit (second system) 114 to use the first system or the first system as the active system. Control is performed so that information (system selection signal) indicating which of the two systems is switched to is added to the transmission signal (uplink).

  This added information (system selection signal) is notified to the switching center 4 via the first system and second system paths.

  The first system received signal (downlink) corrected by the delay time control section 123 is transmitted from the downlink signal processing section (first system) 102 to the selection section 122, and the selection section 122 is used in the first system working. When selected, the received signal (downstream) of the first system passes through the selection unit 122 and is transmitted to the CPU 133. When the selection unit 122 is selected for the second system active, The reception signal (downstream) of system 1 is discarded in selection section 122 (see step S504 in FIG. 5).

  On the other hand, the received signal (downlink) of the second system corrected by the delay time control unit 123 is transmitted from the downlink signal processing unit (second system) 112 to the selection unit 122, and the selection unit 122 transmits the second system. When the current system is selected, the second system received signal (downlink) passes through the selection unit 122 and is transmitted to the CPU 133. When the selection unit 122 is selected for the first system usage, The second system received signal (downlink) is discarded by the selector 122 (see step S504 in FIG. 5).

  When CPU 133 receives the first system or second system reception signal (downlink) from selection section 122, if the received signal (downlink) is a voice call signal, CPU 133 sends a signal to call transmission / reception section 131. When the received signal (downstream) transmitted and received is a data signal, the display unit 132 displays mail and browser information.

  Further, when the CPU 133 receives a voice call signal from the transmission / reception unit 131 or a data signal such as mail or browser information from the display unit 132, the CPU 133 transmits an upstream signal processing unit (first system) as a transmission signal (upstream). 101 and the uplink signal processing unit (second system) 111 transmit the exact same signal.

  A transmission signal (upstream) from the CPU 133 is transmitted from the upstream signal processing unit (first system) 101 to the antenna 105 via the transmission / reception processing unit (first system) 104 and is transmitted from the antenna 105 by radio waves to the radio base station 3. And is transmitted from the upstream signal processing unit (second system) 111 to the wireless module 115 via the transmission / reception processing unit (second system) 114 and from the wireless module 115 to a short distance such as Bluetooth or wireless LAN. It is transmitted to the small base station 2 by a wireless transmission method.

  Next, using FIG. 4 and FIG. 5, the operation when the exchange 4 in the present embodiment performs signal transmission / reception will be described. The main operation of the exchange 4 in the present embodiment is the same as the main operation of the mobile phone 1.

  First, the exchange 4 in the present embodiment communicates with the radio base station 3 via the transmission / reception processing unit (first system) 404 and the wire 6 in the first system communication with the mobile phone 1. Of the operations (first system operations) when signals are transmitted / received between them, the reception operation will be described.

  First, in the first system operation, the uplink signal transmitted from the radio base station 3 is synchronized by the synchronization detection unit 403 via the transmission / reception processing unit (first system) 404, and the synchronization detection result of the uplink signal Is transmitted to the upstream signal processing unit (first system) 402 and the comparison unit 425.

  The system selection signal extracted from the upstream signal when the upstream signal synchronized by the synchronization detection unit 403 is transmitted to the upstream signal processing unit (first system) 402 is sent to the system selection signal detection unit 424. Sent.

  Next, the exchange 4 in the present embodiment communicates with the radio base station 3 via the transmission / reception processing unit (second system) 414 and the wire 7 in the first system communication with the mobile phone 1. Of the operations (second system operations) when signals are transmitted and received between them, the receiving operation will be described.

  First, in the second system operation, the uplink signal transmitted from the small base station 2 is synchronized by the synchronization detection unit 413 via the transmission / reception processing unit (second system) 414, and the synchronization detection result of the uplink signal Is transmitted to the upstream signal processing unit (second system) 412 and the comparison unit 425.

  The system selection signal extracted from the uplink signal when the uplink signal synchronized by the synchronization detection unit 413 is transmitted to the uplink signal processing unit (second system) 412 is sent to the system selection signal detection unit 424. Sent.

  Here, the operation of the comparison unit 425 will be described.

  The comparison unit 425 that receives the synchronization detection results from the synchronization detection unit (first system) 403 and the synchronization detection unit (second system) 413 is shown in FIG. In this way, the upstream signal of the first system and the upstream signal of the second system are compared, the reception delay time difference T, which is the time difference per frame of the upstream signal, is measured, and the measured reception delay time difference T is controlled by the delay time. It transmits to the part 423 (refer step S501 of FIG. 5).

  Here, the operation of the delay time control unit 423 will be described.

  The delay time control unit 423 sends an uplink signal to the uplink signal processing unit (first system) 402 and the uplink signal processing unit (second system) 412 based on the reception delay time difference T received from the comparison unit 425. Control.

  More specifically, the delay time control unit 423 is similar to the delay time control unit 123 of the mobile phone 1, as shown in FIG. 7, out of the first system upstream signal and the second system upstream signal, The reception delay time difference T is corrected (the reception delay time difference T is delayed) for the upstream signal of the system with early reception timing to the mobile phone 1, and the timing of the upstream signal of the first system and the upstream signal of the second system is corrected. (See step S502 in FIG. 5).

  In addition, the system selection signal detection unit 424 that has received the system selection signal from the first system upstream signal and the second system upstream signal, based on the system selection signal, performs the second system operation in the state of the first system operation. It is determined whether it is a request for switching to the system or a request for switching to the first system in the state of the second system operation, and a system switching request is made to the CPU 433.

  Next, when the CPU 433 receives a switching request from the system selection signal detection unit 424, the CPU 433 issues a system switching request to the system selection control unit 421.

  Note that the transmission / reception processing unit (first system) 404 determines that communication between the radio base station 3 and the mobile phone 1 is disconnected when the signal from the radio base station 3 is not received, and the CPU 433 The fact that the communication of the first system is cut off (information of the first system communication cut off) is transmitted (see step S503 in FIG. 5).

  In this case, when the CPU 433 receives the first system communication disconnection information from the transmission / reception processing unit (first system) 404, the CPU 433 controls the system selection control unit 421 to switch to the second system.

  Similarly, the transmission / reception processing unit (second system) 414 performs near field communication such as Bluetooth or wireless LAN between the small base station 2 and the mobile phone 1 when a signal from the small base station 2 is not received. It is determined that the communication has been disconnected, and the CPU 433 is notified that the second system communication is disconnected (second system communication disconnection information) (see step S503 in FIG. 5).

  In this case, when receiving the second system communication disconnection information from the transmission / reception processing unit (second system) 414, the CPU 433 controls the system selection control unit 421 to switch to the first system.

  Next, the system selection control unit 421 that has received the switching request from the CPU 433 controls the selection unit 422 to switch to the first system or one case as the active system.

  In response to the switching request from the CPU 133, the system selection control unit 421 sends the first system or the first system as the active system to the transmission / reception processing unit (first system) 404 or the transmission / reception processing unit (second system) 414. Control is performed so that information (system selection signal) indicating which of the two systems is switched to is added to the downstream signal.

  The added information (system selection signal) is notified to the mobile phone 1 via the communication paths of the first system and the second system.

  The uplink signal of the first system corrected by the delay time control unit 423 is transmitted from the uplink signal processing unit (first system) 402 to the selection unit 422, and the selection unit 422 is selected for the first system usage. If the selection unit 422 is selected for the second system, this first system uplink signal is transmitted to the CPU 433 through the selection unit 422. Is discarded in the selection unit 422 (see step S504 in FIG. 5).

  On the other hand, the uplink signal of the second system corrected by the delay time control unit 423 is transmitted from the uplink signal processing unit (second system) 412 to the selection unit 422, and the selection unit 422 selects the second system in use. If the selection unit 422 is selected for the first system, the second system uplink signal passes through the selection unit 422 and is transmitted to the CPU 433. The signal is discarded in the selection unit 422 (see step S504 in FIG. 5).

  The upstream signal of the first system or the second system from the selection unit 422 is transmitted to the communication network 5.

  On the other hand, the downlink signal from the communication network 5 is transmitted to the downlink signal processing unit (first system) 401 and transmitted to the radio base station 3 via the transmission / reception processing unit (first system) 404. It is transmitted to the downlink signal processing unit 411 and transmitted to the small base station 2 via the transmission / reception processing unit (second system) 414.

  (Effects of the first embodiment)

  As described above, according to the present embodiment, in the communication between the mobile phone 1 and the switching center 4, the communication with the switching center 4 is performed via the wireless communication between the mobile phone 1 and the radio base station 3 using radio waves. Two communication means, that is, a first system and a second system that communicates with the switching center 4 via wireless communication using a short-range wireless transmission method such as Bluetooth or wireless LAN between the mobile phone 1 and the small base station 2 By providing a redundant configuration, even if the communication means of one system becomes incapable of communication, communication can be continued with the communication means of the other system that has been synchronized, so it is difficult for calls and data communication to be interrupted on the way There is an effect.

  In addition, by using the present invention, the distance of the communication path also changes between the two communication means for the mobile phone in which the use position is constantly changed. By correcting each signal from the two communication means and matching the transmission / reception timing, when communication on one side is interrupted, the signal is switched to the other system without interruption without using signal quality information. There is an effect that it becomes possible.

(Second Embodiment)
As shown in FIG. 8, the communication system according to the second embodiment of the present invention has two communication systems using radio waves between the mobile phone and the radio base station in the communication system according to the first embodiment. A system having a system, in which a system that communicates by the TDMA system (first system) and a system that communicates by the CDMA system (second system) have a redundant configuration, and communication of either system becomes impossible. However, similar to the communication system in the first embodiment, the communication can be continued without interruption, by instantaneously switching to the other communication path that is synchronized. is there.

  In addition, since each component of the communication system in this embodiment and the operation of each component are the same as those described in the first embodiment, detailed description thereof is omitted.

(Third embodiment)
As shown in FIGS. 9 to 11, the communication system according to the third embodiment of the present invention is obtained by adding one system for communication in the communication system according to the first embodiment. A wireless communication system (first system) using radio waves between a telephone and a wireless base station, a short-range wireless communication system (second system) using Bluetooth between the mobile phone and a small base station, a mobile phone and a small base Even if a short-range wireless communication system (third system) with a station is used in a redundant configuration and communication between any two systems becomes impossible, the same communication system as in the first embodiment is used. In addition, by instantaneously switching to the rest of the communication paths that have been synchronized, communication, communication, the Internet, mail transmission and reception can be continued without interruption.

  In addition, since each component of the communication system in this Embodiment and operation | movement of each component are the same as that of the said 1st Embodiment, detailed description is abbreviate | omitted.

  Although the present invention has been described with reference to the preferred embodiments, the present invention is not necessarily limited to the above embodiments, and various modifications can be made within the scope of the technical idea. .

  That is, according to the present invention, even when four or more systems of communication are simultaneously established between the mobile phone 1 and the switching center 4, the above processing circuits for the transmission / reception signals in the mobile phone 1 and the switching center 4 are already provided. By adding more than the second system and comparing and correcting the signal and switching to the optimal system, it is possible to construct a communication system that switches the communication system without instantaneous signal interruption. Note that the system (system) in the communication system is not particularly limited with respect to the type of communication means, and even if similar communication means, different systems are used as long as the frequency of signals used for communication is different. A redundant configuration is possible, and signals can be switched to different systems without synchronization without interruption.

It is a block diagram which shows the structure of the communication system in 1st Embodiment by this invention. It is a block diagram which shows the internal structure of the mobile telephone in 1st Embodiment. It is a block diagram which shows the hardware constitutions of the mobile telephone of the communication system in 1st Embodiment. It is a block diagram which shows the internal structure of the switching center in 1st Embodiment. It is a flowchart which shows the outline of operation | movement of the communication system in 1st Embodiment. It is a figure explaining the reception delay time difference at the time of comparing the received signal (downlink) of the 1st system and the received signal (downlink) of the 2nd system. It is a figure explaining the 1st system received signal (down) and the 2nd system received signal (down) after reception delay time difference amendment. It is a block diagram which shows the structure of the communication system in 2nd Embodiment by this invention. It is a block diagram which shows the structure of the communication system in 2nd Embodiment by this invention. It is a block diagram which shows the internal structure of the mobile telephone in 3rd Embodiment. It is a block diagram which shows the internal structure of the switching center in 3rd Embodiment.

Explanation of symbols

1: Mobile phone 101: Uplink signal processing unit (first system)
102: Downstream signal processing unit (first system)
103: Synchronization detection unit (first system)
104: Transmission / reception processing unit (first system)
105: Antenna 111: Uplink signal processing unit (second system)
112: Downstream signal processing unit (second system)
113: Synchronization detector (second system)
114: Transmission / reception processor (second system)
115: Wireless module 121: System selection unit 122: Selection unit 123: Delay time control unit 124: System selection signal detection unit 125: Comparison unit 131: Transmission / reception unit 132: Display unit 133 CPU
141: Upstream signal processing unit (third system)
142: Downstream signal processing unit (third system)
143: Synchronization detector (third system)
144: Transmission / reception processing unit (third system)
2: Small base station 21: Radio module 3: Radio base station 4: Switching station 401: Downstream signal processing unit (first system)
402: Uplink signal processing unit (first system)
403: Synchronization detection unit (first system)
404: Transmission / reception processing unit (first system)
411: Downstream signal processing unit (second system)
412: Uplink signal processing unit (second system)
413: Synchronization detection unit (second system)
414: Transmission / reception processing unit (second system)
421: System selection unit 422: Selection unit 423: Delay time control unit 424: System selection signal detection unit 425: Comparison unit 433: CPU
441: Downstream signal processing unit (third system)
442: Upstream signal processing unit (third system)
443: Synchronization detection unit (third system)
444: Transmission / reception processing unit (third system)
5: Communication network 6-8: Wired 1001: CPU
1002: Main storage unit 1003: Communication control unit 1004: Presentation unit 1005: Input unit 1006: Interface unit 1007: Auxiliary storage unit 1008: System bus 2000: Network

Claims (28)

In a communication system in which communication is performed between a mobile terminal and an exchange via a wireless base station,
A communication system comprising at least two systems of communication means for performing communication between the portable terminal and the switching center via the radio base station so that the at least two systems of communication can be established simultaneously in synchronization. 2. The communication system according to claim 1, further comprising signal control means for establishing communication synchronization by aligning reception times between the signals received by the at least two systems of communication means. The signal control means includes
The communication system according to claim 2, wherein the timing between the signals is matched by correcting a difference in signal reception time of each signal received by the at least two systems of communication means. At least one of the portable terminal and the switching center includes switching means for automatically switching to communication of the other system without instantaneous interruption in conjunction with disconnection of communication of the system in operation. The communication system according to any one of claims 1 to 3. The communication system according to claim 4, wherein the signal control unit and the switching unit are incorporated in the same module. At least one system of the communication means is a wireless communication by radio waves between the mobile terminal and the switching center by the wireless base station, or Bluetooth or wireless LAN between the mobile terminal and the switching center. The communication system according to any one of claims 1 to 5, wherein communication is performed via wireless communication based on a distance wireless transmission method. The said signal control means is provided in the said portable terminal and the said switching center, and has a function which establishes the up-and-down bi-directional communication between the said portable terminal and the said switching center. The communication system according to any one of the above. In a mobile terminal that communicates with an exchange via a wireless base station,
A portable terminal comprising: at least two systems of communication means that communicate with the exchange through the radio base station so that the at least two systems of communication can be simultaneously established in synchronization. 9. The portable terminal according to claim 8, further comprising signal control means for establishing communication synchronization by aligning reception times between the signals received by the at least two systems of communication means. The signal control means includes
The mobile terminal according to claim 9, wherein the timing between the signals is adjusted by correcting a difference in signal reception time of each signal received by the at least two systems of communication means. 11. The apparatus according to claim 8, further comprising a switching unit that automatically switches to communication of the other system without instantaneous interruption in conjunction with disconnection of communication of the system in operation. Mobile devices. 12. The mobile terminal according to claim 11, wherein a switching signal for requesting switching to communication of the other system is sent to the exchange in conjunction with disconnection of communication of the system in operation. The switching means switches the system on the basis of a switching signal sent from the exchange and requesting switching to communication of the other system in conjunction with disconnection of communication of the operating system. The portable terminal of Claim 11 or Claim 12. At least one system of the communication means uses the radio base station to perform radio communication by radio waves with the exchange, or radio communication with the exchange by the short-range radio transmission method of Bluetooth or wireless LAN. The mobile terminal according to claim 8, wherein communication is performed via the mobile terminal. The portable terminal according to any one of claims 9 to 14, wherein the signal control unit has a function of establishing bidirectional communication with the exchange. In an exchange that communicates with a mobile terminal via a wireless base station,
An exchange station comprising at least two systems of communication means for communicating with the portable terminal via the radio base station so that the at least two systems of communication can be established simultaneously in synchronization. 17. The exchange according to claim 16, further comprising signal control means for establishing communication synchronization by aligning reception times between the signals received by the at least two systems of communication means. The signal control means includes
18. The exchange according to claim 17, wherein the timing between the signals is matched by correcting a difference in signal reception time of each signal received by the at least two systems of communication means. 19. The switching device according to claim 16, further comprising a switching unit that automatically switches to communication of the other system without instantaneous interruption in conjunction with disconnection of communication of the system that is in operation. Exchange office. 20. The exchange according to claim 19, wherein a switching signal for requesting switching to communication of the other system is sent to the portable terminal in conjunction with disconnection of communication of the system in operation. The switching means switches the system based on a switching signal sent from the mobile terminal and requesting switching to communication of the other system in conjunction with disconnection of communication of the operating system. 21. The exchange according to claim 19 or claim 20. At least one system of the communication means uses the radio base station to perform radio communication by radio waves with the exchange, or radio communication with the exchange by the short-range radio transmission method of Bluetooth or wireless LAN. The exchange according to any one of claims 16 to 21, wherein communication is performed via the exchange. The exchange according to any one of claims 17 to 22, wherein the signal control unit has a function of establishing up-and-down bidirectional communication with the mobile terminal. A communication method for performing communication between a mobile terminal and an exchange via a wireless base station,
In signal control means, communication synchronization is established by aligning reception times between signals received by at least two systems of communication means that communicate between the mobile terminal and the exchange via the wireless base station,
A communication method characterized in that the switching means automatically switches to communication of the other system without instantaneous interruption in conjunction with disconnection of communication of the system in operation. A communication method for a mobile terminal that communicates with an exchange via a wireless base station,
A signal control procedure for establishing communication synchronization by aligning reception times between signals received by at least two systems of communication means communicating with the exchange via the radio base station;
A communication method comprising: a switching procedure for automatically switching to the communication of the other system without instantaneous interruption in conjunction with the disconnection of the communication of the system in operation. A communication method executed on an exchange that communicates with a mobile terminal via a wireless base station,
A signal control procedure for establishing communication synchronization by aligning reception times between signals received by at least two communication means that communicate with the mobile terminal via the wireless base station;
A communication method comprising: a switching procedure for automatically switching to the communication of the other system without instantaneous interruption in conjunction with the disconnection of the communication of the system in operation. A program that is executed on a portable terminal that communicates with an exchange via a wireless base station,
A signal control function for establishing communication synchronization by aligning reception times between signals received by at least two systems of communication means communicating with the exchange via the radio base station;
A program that causes the portable terminal to realize a switching function that automatically switches to communication of the other system without instantaneous interruption in conjunction with disconnection of communication of the system in operation. A program that is executed on an exchange that communicates with a mobile terminal via a wireless base station,
A signal control function for establishing communication synchronization by aligning reception times between signals received by at least two communication means that communicate with the mobile terminal via the wireless base station;
A program characterized by causing the exchange to realize a switching function that automatically switches to communication of the other system without instantaneous interruption in conjunction with disconnection of communication of the system in operation.

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