JP2007060209A - Communication terminal and communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication terminal and a communication method which can perform data transceiving coping with a case in which data transceiving is difficult, and which is easy to occur between devices using radio communication. <P>SOLUTION: A communication terminal 1 is provided with an interface unit 11 which receives transmission data from a device 21 connected through a network 22, an interface unit 14 which performs data transmission to a device 31 connected through a radio system network 41, and a memory 13 which stores the received data. The terminal 1 receives transmission data from the device 21, and transmits the received transmission data to the device 31. The terminal has a means to detect a received radio field intensity from the radio system, and a means to change a data amount per unit time for data transmitting to the device 31 according to the receiving radio field intensity. The transmission data are divided into a plurality of units, and transmission interval of the divided transmission data is changed according to the detected radio field intensity. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication terminal, and more particularly, to a communication terminal and a communication method that connect to a plurality of networks and enable data transmission / reception between devices connected to the networks.

Conventionally, a technique for transmitting and receiving data between a device connected to a first network and a device connected to a second network is known and disclosed in Patent Document 1. When a network uses wireless communication such as a mobile phone system, it may be affected by the occurrence of a poor communication state in wireless communication. If data transmission / reception is performed without taking this into consideration, there is a case where data transmission / reception is not executed because the amount of transmission data per unit time is limited.
JP 2001-308877 A

  The present invention solves the conventional problems, and provides a communication terminal and a communication method capable of coping with data transmission and reception even when it is difficult to perform data transmission / reception between devices using wireless communication. For the purpose.

  The communication terminal of the present invention implements a connection protocol. Therefore, the device can be easily connected to the public network by connecting to the communication terminal, and can perform data communication. Thereby, data communication by the area of the narrow area network (first network) on the connected device side and the wide area network (second network) on the public network side can be easily performed. Activation and command transmission to the communication terminal can be performed from the center side.

  That is, the present invention performs data transmission to a first interface unit that receives transmission data from a first device connected via a first network and a second device connected via a network of a wireless system. In the communication terminal, which includes a second interface unit and a memory for storing received data, receives transmission data from the first device, and transmits the received transmission data to the second device, the wireless system Is a communication terminal having means for detecting the received radio wave intensity from and a means for changing the transmission data amount per unit time of data to be transmitted to the second device in accordance with the detected received radio wave intensity.

  Moreover, this invention is a communication terminal which divides | segments the data to transmit, and changes the transmission interval of the divided | segmented data according to the said received radio wave strength, when transmitting to the said 2nd apparatus.

  The present invention is a communication terminal that does not divide a packet unit of transmission data received from a first device when dividing data to be transmitted into a plurality of pieces.

  Furthermore, the present invention is a communication terminal having a mapping function for connecting a plurality of transmission source devices and transmission destination devices, and for achieving connection between the transmission source device and the transmission destination device.

  Further, the present invention is a communication terminal having a correspondence table between the IP address of the transmission source device and the IP address of the transmission destination device, and changing the destination of the packet to be transmitted using the correspondence table.

  The present invention is a communication terminal provided with a dedicated port and capable of acquiring information of the terminal itself with respect to an external device connected via the dedicated port.

  Furthermore, the present invention is a communication terminal having a correspondence table that enables connection with a plurality of servers as transmission destination devices.

  The present invention also receives transmission data from a first device connected via a first network, stores the received transmission data in a memory, and transmits the transmission data stored in the memory via a network of a wireless system. In the method of transmitting to the second device connected in a manner, the received radio wave intensity from the wireless system is detected, and the transmission data amount per unit time of the data to be transmitted to the second device is determined according to the detected received radio wave intensity. The communication method to be changed.

  According to the present invention, a device connected to a communication terminal can communicate without performing troublesome procedures for connection to a wireless network, can be easily connected to a public network, and can perform data communication. In addition, data communication can be easily performed by a narrow-area network on the device side and a wide-area network area on the public network side, and activation and command transmission to the communication terminal can be performed from the center side.

The best mode for carrying out the present invention will be described.
Embodiments of a communication terminal and a communication method according to the present invention will be described with reference to the drawings.

  Example 1 will be described. As shown in FIG. 1, the communication terminal 1 according to the present embodiment is connected to a LAN 22 to which one or more servers or client computers A21a and B21b are connected, receives transmission data from the device 21, and receives a mobile phone system. The data is transmitted to the transmission destination server 31 on the user side 3 connected to the data center 42 via the dedicated line 43 via a wireless communication network (public wireless) network 41 such as the above. Data transmission / reception between the communication terminal 1 and the device 21 is performed by the Ethernet (registered trademark) system, and data is performed in units of packets. The device 21 and the communication terminal 1 connected to the LAN 22 each have an address, and when data is sent to the LAN 22, a data collision is detected and avoided. Data transmission / reception between the communication terminal 1 and the destination server 31 is performed using a mobile phone system, and data transmitted via the network 41 of the mobile phone system is performed in units of packets and received from the transmission source device 21. A plurality of packets are sent together, but one packet is not divided.

  As shown in FIG. 2, the transmission terminal 1 according to the present embodiment includes a LAN i / f 11, a CPU 12, a memory 13, a wireless communication control unit 14, and the like. The LAN i / f 11 transmits and receives data to and from the device 21 connected via the LAN 22. The CPU 12 controls the communication terminal 1 as a whole. The memory 13 stores transmission data from the transmission source device 21 and the like. The wireless communication control unit 14 transmits / receives data via the wireless network via the antenna 15, detects the reception intensity in the mobile phone system, and obtains information on the number of antennas.

  A transmission method by the communication terminal of this embodiment will be described. The communication terminal 1 receives transmission data from the transmission source device 21 and receives information on reception intensity in the mobile phone system, for example, the number of antennas. In the mobile phone system, the communication state varies greatly and changes from a good state to a bad state. In a poor communication state, the amount of transmission data per unit time is limited. The communication terminal 1 of the present embodiment can optimize the speed of wireless communication by controlling the transmission interval of data to be transmitted based on the received number of antenna information. The CPU 12 adjusts the data sending interval when sending a certain amount from the data stored in the memory to the wireless communication control unit 14. For example, when the number of antennas increases and the communication state becomes good, the data transmission interval to the wireless communication control unit 14 is shortened. When the number of antennas decreases and the communication state deteriorates, the data transmission interval to the wireless communication control unit 14 is lengthened and the amount of transmission data per unit time is decreased. As a result, the uplink / downlink ratio in transmission / reception with the mobile phone system is adjusted. The greater the number of antennas, the greater the specific gravity of the uplink. When the number of antennas becomes 0 and transmission to the wireless communication network 41 is difficult, the CPU 12 stops acquiring data from the LAN 22 in order to prevent the data stored in the memory 13 from overflowing. Note that the amount of data sent to the wireless communication control unit 14 may be increased or decreased according to the number of antennas.

  The transmitting terminal of the present embodiment has two IP address groups (192.168.8.0. **, 192.168.1. **) in the terminal. These are IP addresses for network connection of the LAN side device and the server side device, respectively. If, for example, the IP address (192.168.0.12) of the LAN side device and the IP address (192.168.1.10) of the server side device are associated with each other in the two IP address groups, Both are connected to the network to enable communication. The communication terminal has a setting table shown as an example in FIG. The correspondence between the LAN side device and the server side device may be one-to-one correspondence, but is not limited thereto. That is, a connection destination or the like is set in advance, a connection between a narrow area network (LAN) and a wide area network (a mobile phone system) is established, and data can be transmitted and received. The communication terminal does not automatically generate a port, but establishes connection and transmits / receives data connected to a preset port toward the set destination IP address and port number. By selecting the TCP connection on the Ethernet side and the wireless network side of the communication terminal from the server (S) and the client (C), a connection trigger from both directions is possible. When the connection is established to the port number set in the server (S), the connection is made to the set IP address of the opposite network. The server (S) and the client (C) are always set to be combined on the narrow area side and the wide area side, and the server (S) and the client (C) cannot be set. In the UDP connection, a destination IP address and a port number are set, and when data is received in the port number, the data is transmitted to the opposite network.

  The communication terminal of this embodiment has a dedicated port in addition to the information exchange port. For example, even when data is transmitted and received between the data center 42 and the transmission source device 21, information in the communication terminal can be acquired by connecting using a dedicated port. The dedicated port is read-only for security, but can be used for control or remote operation.

  The communication terminal of the present embodiment has a connection destination table shown as an example in FIG. The connection destination table is a map of connection destination addresses, and includes a domain name, a telephone network connection destination, and the like, and the communication terminal can connect to a plurality of servers. The telephone network connection destination includes a user ID, a password, and the like. For example, when the center transmits data to the communication terminal in the incoming call waiting state, it cannot be received. Therefore, the center transmits a terminal activation signal to the communication terminal. The communication terminal confirms the contents of the terminal activation signal and connects the wireless network to the instructed connection destination. Thereby, data communication can be performed with a plurality of server facilities.

  Conventionally, for example, in order to connect to server A first through a dedicated line and to connect to a plurality of other servers B, C,..., Server A and each connection destination are generally connected to the Internet. It was. Therefore, if the server A goes down for some reason, other connection destinations cannot receive data. The communication terminal 1 according to the present embodiment can be connected in a one-to-one correspondence with a plurality of counterparts, for example. That is, in FIG. 1, the other servers B, C... Can be used even if the server A goes down by connecting to the data center 42 through a dedicated line (same as or different from 43). Note that security is also ensured because it is impossible to connect to anything other than the connection destination table.

As described above, the features of the above embodiment according to the present invention are as follows.
(1) The communication interval can be controlled according to the antenna level.
(2) Connection correspondence between individual devices on the LAN side and the server side can be set.
(3) A dedicated port is provided that enables information acquisition of the communication terminal itself.
(4) Connection with multiple servers is possible. The terminal has a map of connection destination addresses (ID, password, phone number).

Explanatory drawing of the system which uses the communication terminal of an Example. Explanatory drawing of the communication terminal of an Example. Explanatory drawing of the setting table | surface of the communication terminal of an Example. Explanatory drawing of the correspondence table in the communication terminal of an Example.

Explanation of symbols

1 Communication terminal 11 LAN i / f
12 CPU
13 Memory 14 Wireless Communication Control Unit 15 Antenna 21, 21a, 21b Device 22 LAN
3 User side 31 Server 32 Router 41 Wireless communication network 42 Data center 43 Dedicated line

Claims (8)

A first interface unit that receives transmission data from a first device connected via a first network, and a second interface unit that transmits data to a second device connected via a network of a wireless system; A communication terminal for receiving the transmission data from the first device and transmitting the received transmission data to the second device, comprising a memory for storing the received data,
And a means for detecting a received radio wave intensity from the wireless system and a means for changing a transmission data amount per unit time of data to be transmitted to the second device according to the detected received radio wave intensity. Communication terminal. The communication terminal according to claim 1, wherein
A communication terminal that divides data to be transmitted into a plurality of data when transmitting to the second device, and changes a transmission interval of the divided data according to the received radio wave intensity. The communication terminal according to claim 2, wherein
A communication terminal characterized by not dividing a packet unit of transmission data received from a first device when dividing data to be transmitted into a plurality of pieces. The communication terminal according to claim 1, wherein
A communication terminal comprising a mapping function for connecting a plurality of transmission source devices and transmission destination devices, and for achieving connection between the transmission source device and the transmission destination device. The communication terminal according to claim 4, wherein
A communication terminal having a correspondence table of an IP address of the transmission source device and an IP address of the transmission destination device, and changing a destination of a packet to be transmitted using the correspondence table. The communication terminal according to claim 1, wherein
A communication terminal having a dedicated port and capable of acquiring information of the terminal itself with respect to an external device connected via the dedicated port. The communication terminal according to claim 1, wherein
A communication terminal having a correspondence table that enables connection with a plurality of servers as transmission destination devices. Receiving transmission data from the first device connected via the first network, storing the received transmission data in the memory, and transmitting the transmission data stored in the memory via the network of the wireless system; In the method of transmitting to the device,
A communication method comprising: detecting a received radio wave intensity from the wireless system; and changing a transmission data amount per unit time of data to be transmitted to the second device according to the detected received radio wave intensity.

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