Wireless base station

Abstract

To provide a communication system capable of suppressing power consumption by restricting a transmission-power upper-limit value in accordance with intention of a user and so on.SOLUTION: In a communication system (100), for each wireless terminal (2), a value that is lower than the maximum transmission power of the wireless terminal (2) is set as a transmission-power upper-limit value, and the transmission power of the wireless terminal (2) is controlled in such a way that the transmission-power upper-limit value of the wireless terminal (2) becomes the value set for the wireless terminal (2). It is therefore possible for power consumption to be suppressed by restricting the transmission-power upper-limit value of the wireless terminal (2) in accordance with intention of the user and so on. Furthermore, it is possible for effects of radio-frequency electromagnetic fields on a human body to be lessened.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a communication system that controls communications performed by a wireless terminal device via a communication network, and more particularly to a technique for controlling the transmission power of a wireless terminal device or a communication system. [Background technology]

[0002] In recent years, wireless terminals (hereinafter referred to simply as wireless terminals) in mobile communication systems, such as battery-powered mobile phones and mobile PCs with built-in communication devices, have become widespread, and technological development is being carried out to reduce power consumption as much as possible by making full use of various power-saving technologies.

[0003] On the other hand, when looking at the breakdown of power consumption of wireless terminals, the proportion related to transmission is large. Conventional wireless terminals determine their transmission power based on the signal strength and quality of the received signal received from a wireless base station (hereinafter simply referred to as a wireless base station) in a mobile communication system.

[0004] As an example of the conventional technology, the technology described in Patent Document 1 is a technology that measures the strength of a received signal in wireless communication and determines the transmission power. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 07-226710 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in conventional wireless terminal devices, users (including users, guardians, administrators, manufacturers, distributors, telecommunications carriers, and others; the same applies below) cannot intentionally control the transmission power, so when the power is on, users cannot reduce the transmission power in order to reduce power consumption. For this reason, in environments where it is difficult for radio waves from wireless base stations to reach, wireless terminal devices transmit at maximum output, which is one of the causes of power consumption contrary to users' expectations.

[0007] An object of the present invention is to provide a communication system capable of reducing power consumption by restricting transmission power at the user's discretion.

[0008] Radio waves radiated from a radio base station with a predetermined transmission power are subject to propagation loss on the path to the receiver and are received by a radio terminal.

[0009] Similarly, radio waves emitted from a wireless terminal undergo the same propagation loss on the path to the receiver and are received by the wireless base station. Since the propagation loss on the transmitting side and the receiving side are equal, communication is symmetrical.

[0010] Usually, the maximum transmission power of a wireless base station and a wireless terminal differ. Even if the transmission output of the wireless base station and the wireless terminal are different, the system is designed to maintain "communication symmetry" by taking into account the antenna characteristics and the noise figure of the receiving unit, etc.

[0011] If only the transmission power of the wireless terminal is reduced, the signal received by the wireless base station will become weaker, and "symmetry of communication" will no longer be maintained. In this state, to maintain "symmetry of communication" only on the wireless terminal side, it is sufficient to reduce the reception sensitivity to match the reduced transmission power of the wireless terminal.

[0012] An object of the present invention is to make it possible to suppress transmission power at the user's discretion while ensuring "symmetry of communication." [Means for solving the problem]

[0013] [Invention 1] In order to achieve the above object, the communication system of Invention 1 is a communication system that is connected to a plurality of wireless terminal devices so as to be able to communicate wirelessly, and includes a transmission power upper limit value setting means for setting, for each of the wireless terminal devices, an upper limit value of the transmission power to a value lower than the maximum upper limit value of the wireless terminal device, and a wireless terminal device control means for controlling the wireless terminal device so that the upper limit value of the transmission power of the wireless terminal device becomes the value set for that wireless terminal device by the transmission power upper limit value setting means.

[0014] Here, communication includes communication (outgoing) performed by a wireless terminal device on the calling side, and communication (incoming) performed by a wireless terminal device on the called side. The same applies to the communication systems of inventions 4, 7, 10, 13, 14, 16, 18 to 21, and 28, and the wireless transceiver of invention 42.

[0015] Moreover, the communication includes telephone calls, data communication, and other communications. From the viewpoint of hierarchy, the communication includes communication at the physical layer level and communication at the logical layer level. The same applies to the communication systems of inventions 4, 7, 10, 13, 14, 16, 18 to 21, and 28, and the wireless transceiver of invention 42.

[0016] The maximum upper limit of the transmission power refers to the maximum transmission power that the wireless terminal can realize based on its performance, or the maximum transmission power required by the standard when the communication quality with the communication partner (e.g., this communication system) is at the lowest level. The same applies to the communication systems of inventions 4, 7, 10, 13, 29, 32, 35, 38, and 41.

[0017] The wireless terminal control means may have any configuration as long as it controls the wireless terminal, and may include, for example, a configuration for controlling the transmission power of the wireless terminal, a configuration for controlling, setting or fixing an upper limit of the transmission power of the wireless terminal, a configuration for controlling the reception performance of the wireless terminal, or a configuration for controlling, setting or fixing an upper limit of the reception performance of the wireless terminal. The same applies to the communication systems of inventions 4, 7, 10 and 13 below.

[0018] Furthermore, this system may be realized as a single device (e.g., a wireless base station), terminal, or other equipment, or may be realized as a network system in which multiple devices (e.g., a switchboard and a wireless base station), terminals, and other equipment are communicatively connected. In the latter case, each component may belong to any of the multiple devices, etc., as long as they are communicatively connected to each other. The same applies to the communication systems of inventions 4, 7, 10, 13, 14, 16, 18 to 21, and 28 below.

[0019] [Invention 2] The communication system of Invention 2 further comprises, in the communication system of Invention 1, a transmission power upper limit value acquisition means for acquiring from the wireless terminal device a value lower than a maximum upper limit value of the wireless terminal device, and the transmission power upper limit value setting means sets the value acquired from the wireless terminal device by the transmission power upper limit value acquisition means as the upper limit value of the transmission power of the wireless terminal device.

[0020] Here, the transmission power upper limit value acquiring means may have any configuration as long as it is capable of acquiring the upper limit value of the transmission power, and may, for example, be configured to input the upper limit value of the transmission power from an input device or the like, to acquire or receive the upper limit value of the transmission power from an external terminal or the like, or to read the upper limit value of the transmission power from a storage device or storage medium or the like. Therefore, acquiring includes at least input, acquisition, reception, and reading. The same concept of acquiring will be used hereinafter.

[0021] [Invention 3] The communication system of Invention 3 further comprises, in the communication system of Invention 1, a transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device, and the transmission power upper limit value setting means sets the value acquired by the transmission power upper limit value acquisition means from a wireless terminal device related to the wireless terminal device as the upper limit value of the transmission power of the wireless terminal device.

[0022] Here, the wireless terminal related to the wireless terminal includes, for example, a wireless terminal of a communication partner, or a wireless terminal owned by a family member, friend, employee, or other related party. The same applies to the communication systems of the following inventions 6, 9, 12, 13, 31, 34, 37, 40, and 41.

[0023] [Invention 4] Furthermore, the communication system of Invention 4 is a communication system that is connected to a plurality of wireless terminal devices so as to be able to communicate wirelessly, and includes a transmission power upper limit value storage means for storing, for each of the wireless terminal devices, a transmission power upper limit value table in which a value lower than the maximum upper limit value of the wireless terminal device is set as the upper limit value of the transmission power, and a wireless terminal device control means for controlling the wireless terminal device so that the upper limit value of the transmission power of the wireless terminal device becomes the value set in the transmission power upper limit value table for that wireless terminal device.

[0024] [Invention 5] The communication system of Invention 5 further comprises, in the communication system of Invention 4, a transmission power upper limit value acquiring means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from the wireless terminal device, and a transmission power upper limit value setting means for setting the value acquired from the wireless terminal device by the transmission power upper limit value acquiring means in the transmission power upper limit value table as an upper limit value of the transmission power of the wireless terminal device.

[0025] [Invention 6] The communication system of Invention 6 further comprises, in the communication system of Invention 4, a transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device, and a transmission power upper limit value setting means for setting the value acquired from a wireless terminal device related to the wireless terminal device by the transmission power upper limit value acquisition means in the transmission power upper limit value table as an upper limit value of the transmission power of the wireless terminal device.

[0026] [Invention 7] Furthermore, the communication system of Invention 7 is a communication system wirelessly connected to a plurality of wireless terminal devices, and is communicatively connected to a management device having a transmission power upper limit setting means for setting, for each of the wireless terminal devices, a value lower than the maximum upper limit of the wireless terminal device as the upper limit of transmission power, and is equipped with a transmission power upper limit acquisition means for acquiring from the management device the value set by the transmission power upper limit setting means, and a wireless terminal device control means for controlling the wireless terminal device so that the upper limit of transmission power of the wireless terminal device becomes the value acquired for that wireless terminal device by the transmission power upper limit acquisition means.

[0027] [Invention 8] Furthermore, in the communication system of Invention 8, in the communication system of Invention 7, the management device is provided with a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from the wireless terminal device, and the transmission power upper limit value setting means sets the value acquired from the wireless terminal device by the second transmission power upper limit value acquisition means as the upper limit value of the transmission power of the wireless terminal device.

[0028] [Invention 9] Furthermore, in the communication system of Invention 9, in the communication system of Invention 7, the management device is provided with a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device, and the transmission power upper limit value setting means sets the value acquired by the second transmission power upper limit value acquisition means from a wireless terminal device related to the wireless terminal device as the upper limit value of the transmission power of the wireless terminal device.

[0029] [Invention 10] Furthermore, the communication system of Invention 10 is a communication system wirelessly connected to a plurality of wireless terminal devices, and is communicatively connected to a management device having a transmission power upper limit value storage means for storing, for each of the wireless terminal devices, a transmission power upper limit value table in which a value lower than the maximum upper limit value of the wireless terminal device is set as the upper limit value of the transmission power, and is equipped with a transmission power upper limit value acquisition means for acquiring from the management device the value set in the transmission power upper limit value table, and a wireless terminal device control means for controlling the wireless terminal device so that the upper limit value of the transmission power of the wireless terminal device becomes the value acquired for that wireless terminal device by the transmission power upper limit value acquisition means for that wireless terminal device.

[0030] [Invention 11] Furthermore, in the communication system of Invention 11, in the communication system of Invention 10, the management device comprises a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from the wireless terminal device, and a transmission power upper limit value setting means for setting the value acquired from the wireless terminal device by the second transmission power upper limit value acquisition means in the transmission power upper limit value table as an upper limit value of the transmission power of the wireless terminal device.

[0031] [Invention 12] Furthermore, in the communication system of Invention 12, in the communication system of Invention 10, the management device comprises a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device, and a transmission power upper limit value setting means for setting the value acquired by the second transmission power upper limit value acquisition means from a wireless terminal device related to the wireless terminal device in the transmission power upper limit value table as an upper limit value of the transmission power of the wireless terminal device.

[0032] [Invention 13] Furthermore, the communication system of Invention 13 is a communication system that is connected to a plurality of wireless terminal devices so as to be able to communicate wirelessly with them, and includes a transmission power upper limit value acquisition means for acquiring a value lower than the maximum upper limit value of the wireless terminal devices from the wireless terminal devices or wireless terminal devices related thereto, and a wireless terminal device control means for controlling the wireless terminal devices so that the upper limit value of the transmission power of the wireless terminal devices becomes the value acquired from the wireless terminal devices or wireless terminal devices related thereto by the transmission power upper limit value acquisition means.

[0033] [Invention 14] Furthermore, the communication system of Invention 14 is a communication system that is connected to a plurality of wireless terminal devices so as to be able to communicate wirelessly, and is equipped with a transmission power upper limit value increasing means for each of the wireless terminal devices that increases the upper limit value of the transmission power to that wireless terminal device above a reference upper limit value.

[0034] [Invention 15] The communication system of invention 15 further comprises a reception performance increasing means for increasing reception performance in accordance with the upper limit of transmission power increased by the transmission power upper limit increasing means in the communication system of invention 14.

[0035] [Invention 16] Furthermore, the communication system of Invention 16 is a communication system that is connected to a plurality of wireless terminal devices so as to be able to communicate wirelessly, and is equipped with an antenna having a gain higher than a reference gain, and an antenna control means that controls the antenna so that the upper limit value of the transmission power to a target wireless terminal device is increased above the reference upper limit value.

[0036] [Invention 17] The communication system of invention 17 further comprises a reception performance increasing means for increasing reception performance in accordance with the upper limit of transmission power increased by said antenna control means in the communication system of invention 16.

[0037] [Invention 18] Furthermore, the communication system of Invention 18 is a communication system that is connected to a plurality of wireless terminal devices so as to be able to communicate wirelessly with them, and is provided with a transmission power upper limit value lowering means for lowering an upper limit value of transmission power, and a reception performance lowering means for lowering reception performance in accordance with the upper limit value of transmission power lowered by the transmission power upper limit value lowering means.

[0038] [Invention 19] Furthermore, the communication system of Invention 19 is a communication system that is connected to a plurality of wireless terminal devices so as to be able to communicate wirelessly, and is provided with a reception performance reducing means for reducing reception performance, and a transmission power upper limit reducing means for reducing the upper limit of the transmission power in accordance with the reception performance reduced by the reception performance reducing means.

[0039] [Invention 20] Furthermore, the communication system of Invention 20 is a communication system that is connected to a plurality of wireless terminal devices so as to be able to communicate wirelessly, and includes a transmission power upper limit value lowering means for lowering the upper limit value of transmission power, and a reception status notifying means for notifying the wireless terminal devices of the reception status when reception performance is lowered or assumed to be lowered in accordance with the upper limit value of transmission power lowered by the transmission power upper limit value lowering means.

[0040] [Invention 21] Furthermore, the communication system of Invention 21 is a communication system that is connected to a plurality of wireless terminal devices so as to be able to communicate wirelessly, and is equipped with a reception status notifying means for notifying the wireless terminal devices of the reception status when reception performance is degraded or assumed to be degraded, and a transmission power upper limit lowering means for lowering the upper limit of the transmission power in accordance with the reception performance when it is degraded or assumed to be degraded.

[0041] [Invention 22] Furthermore, in the communication system of invention 22, in any one of the communication systems of inventions 18 and 19, the reception performance lowering means lowers the reception performance for each of the wireless terminals.

[0042] [Invention 23] Furthermore, in the communication system of Invention 23, in any one of the communication systems of Inventions 18 to 22, the transmission power upper limit value lowering means lowers the upper limit value of the transmission power to each of the wireless terminal devices.

[0043] [Invention 24] Furthermore, the communication system of invention 24 is the communication system of any one of inventions 18 to 23, and establishes communication with the wireless terminal device in wireless transmission and reception with radio wave intensity stronger than a pre-registered radio wave intensity depending on the reception performance.

[0044] [Invention 25] Furthermore, the communication system of invention 25 is the communication system of any one of inventions 15, 17 to 24, wherein the receiving performance is receiving sensitivity.

[0045] [Invention 26] Furthermore, in the communication system of invention 26, in any one of the communication systems of inventions 15, 17 to 24, the reception performance is a reference value for determining whether communication has been established.

[0046] [Invention 27] Furthermore, the communication system of invention 27 is the communication system of any one of inventions 15, 17 to 24, wherein the receiving performance is a permissible value of an error rate of received data.

[0047] [Invention 28] Furthermore, the communication system of Invention 28 is a communication system that is connected to a plurality of wireless terminal devices so as to be able to communicate wirelessly, and is equipped with a transmission power value acquisition means for acquiring a transmission power value of the wireless terminal devices, and a communication prohibition means for prohibiting communication with the wireless terminal devices when the transmission power value acquired by the transmission power value acquisition means is equal to or exceeds a predetermined value.

[0048] [Invention 29] Furthermore, the communication system of Invention 29, in the communication system of Invention 28, further comprises a transmission power upper limit setting means for setting, for each wireless terminal device, an upper limit value of the transmission power that is lower than the maximum upper limit value of the wireless terminal device, and the communication prohibiting means prohibits communication with the wireless terminal device when the value of the transmission power acquired for the wireless terminal device by the transmission power value acquisition means is equal to or greater than the value set for the wireless terminal device by the transmission power upper limit setting means.

[0049] [Invention 30] The communication system of Invention 30 further comprises, in the communication system of Invention 29, a transmission power upper limit value acquisition means for acquiring from the wireless terminal device a value lower than the maximum upper limit value of the wireless terminal device, and the transmission power upper limit value setting means sets the value acquired from the wireless terminal device by the transmission power upper limit value acquisition means as the upper limit value of the transmission power of the wireless terminal device.

[0050] [Invention 31] The communication system of Invention 31 further comprises, in the communication system of Invention 29, a transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device, and the transmission power upper limit value setting means sets the value acquired by the transmission power upper limit value acquisition means from a wireless terminal device related to the wireless terminal device as the upper limit value of the transmission power of the wireless terminal device.

[0051] [Invention 32] Furthermore, the communication system of Invention 32, in the communication system of Invention 28, further comprises a transmission power upper limit storage means for storing, for each wireless terminal device, a transmission power upper limit table in which a value lower than the maximum upper limit value of the wireless terminal device is set as the upper limit value of the transmission power, and the communication prohibiting means prohibits communication with the wireless terminal device when the value of the transmission power acquired for the wireless terminal device by the transmission power value acquisition means is equal to or greater than the value set in the transmission power upper limit table for the wireless terminal device or exceeds this value.

[0052] [Invention 33] The communication system of Invention 33 further comprises, in the communication system of Invention 32, a transmission power upper limit value acquisition means for acquiring from the wireless terminal device a value lower than a maximum upper limit value of the wireless terminal device, and a transmission power upper limit value setting means for setting the value acquired from the wireless terminal device by the transmission power upper limit value acquisition means in the transmission power upper limit value table as an upper limit value of the transmission power of the wireless terminal device.

[0053] [Invention 34] The communications system of Invention 34 further comprises, in the communications system of Invention 32, a transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device, and a transmission power upper limit value setting means for setting the value acquired from a wireless terminal device related to the wireless terminal device by the transmission power upper limit value acquisition means in the transmission power upper limit value table as an upper limit value of the transmission power of the wireless terminal device.

[0054] [Invention 35] The communication system of Invention 35 further comprises the communication system of Invention 28, which is communicably connected to a management device having a transmission power upper limit setting means for setting, for each of the wireless terminals, a value lower than a maximum upper limit of the wireless terminals as the upper limit of transmission power, and a transmission power upper limit acquisition means for acquiring from the management device the value set by the transmission power upper limit setting means, and the communication prohibition means prohibits communication with the wireless terminal when the transmission power value acquired for the wireless terminal by the transmission power value acquisition means is equal to or greater than the value acquired for the wireless terminal by the transmission power upper limit acquisition means. do.

[0055] [Invention 36] Furthermore, in the communication system of Invention 36, in the communication system of Invention 35, the management device is provided with a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from the wireless terminal device, and the transmission power upper limit value setting means sets the value acquired from the wireless terminal device by the second transmission power upper limit value acquisition means as the upper limit value of the transmission power of the wireless terminal device.

[0056] [Invention 37] Furthermore, in the communication system of Invention 37, in the communication system of Invention 35, the management device is provided with a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device, and the transmission power upper limit value setting means sets the value acquired by the second transmission power upper limit value acquisition means from a wireless terminal device related to the wireless terminal device as the upper limit value of the transmission power of the wireless terminal device.

[0057] [Invention 38] The communication system of Invention 38 is the communication system of Invention 28, further comprising a management device communicably connected to the management device having a transmission power upper limit storage means for storing a transmission power upper limit table in which a value lower than a maximum upper limit value of the wireless terminal is set as the upper limit value of the transmission power for each of the wireless terminals, and a transmission power upper limit acquisition means for acquiring a value set in the transmission power upper limit table from the management device, and the communication prohibition means is configured to prohibit communication when the transmission power value acquired by the transmission power value acquisition means for the wireless terminal is equal to or greater than the value acquired by the transmission power upper limit acquisition means for the wireless terminal. prohibits communication with the wireless terminal in question.

[0058] [Invention 39] Furthermore, in the communications system of Invention 39, in the communications system of Invention 38, the management device comprises a second transmission power upper limit value acquisition means for acquiring from the wireless terminal device a value lower than a maximum upper limit value of the wireless terminal device, and a transmission power upper limit value setting means for setting the value acquired from the wireless terminal device by the second transmission power upper limit value acquisition means in the transmission power upper limit value table as an upper limit value of the transmission power of the wireless terminal device.

[0059] [Invention 40] Furthermore, in the communications system of Invention 40, in the communications system of Invention 38, the management device comprises a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device, and a transmission power upper limit value setting means for setting the value acquired by the second transmission power upper limit value acquisition means from a wireless terminal device related to the wireless terminal device in the transmission power upper limit value table as an upper limit value of the transmission power of the wireless terminal device.

[0060] [Invention 41] Furthermore, the communication system of Invention 41, in the communication system of Invention 28, is provided with a transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from the wireless terminal device or a wireless terminal device associated therewith, and the communication prohibition means prohibits communication with the wireless terminal device when the transmission power value acquired for the wireless terminal device by the transmission power value acquisition means is equal to or exceeds the value acquired from the wireless terminal device or a wireless terminal device associated therewith by the transmission power upper limit value acquisition means.

[0061] [Invention 42] On the other hand, in order to achieve the above object, the wireless transceiver of Invention 42 comprises a transmission power value acquisition means for acquiring the value of the transmission power of the communication partner, and a communication prohibition means for prohibiting communication with the communication partner when the value of the transmission power acquired by the transmission power value acquisition means is equal to or exceeds a predetermined value. Effect of the Invention

[0062] As described above, according to the communication system of Inventions 1, 4, 7, 10, or 13, the power consumption can be reduced by restricting the upper limit of the transmission power of the wireless terminal device at the user's discretion. In addition, the effect of the radio frequency electromagnetic field on the human body can be weakened.

[0063] Furthermore, according to the communication system of inventions 14 and 16, if the transmission power of the communication system increases, the wireless terminal device reduces its own transmission power, so that the power consumption can be reduced by restricting the upper limit of the transmission power of the wireless terminal device at the user's discretion. Also, the effect of radio frequency electromagnetic fields on the human body can be weakened.

[0064] Furthermore, according to the communication systems of Inventions 18 to 21, the power consumption can be reduced by restricting the upper limit of the transmission power of the communication systems at the user's discretion. Also, the effect of radio frequency electromagnetic fields on the human body can be weakened.

[0065] Furthermore, according to the communication system of invention 28, when a wireless terminal communicates with a transmission power equal to or higher than a predetermined value, the wireless terminal cannot communicate with the communication system, so that the power consumption can be reduced by restricting the transmission power of the wireless terminal at the user's discretion. Also, the effect of radio frequency electromagnetic fields on the human body can be reduced.

[0066] On the other hand, according to the wireless transceiver of the invention 42, if the communication partner communicates with a transmission power equal to or higher than a predetermined value, the communication partner cannot communicate with the wireless transceiver, so that the power consumption can be reduced by restricting the transmission power of the communication partner at the user's discretion. Also, the effect of the radio frequency electromagnetic field on the human body can be weakened. [Brief description of the drawings]

[0067] [Figure 1] FIG. 1 is a diagram showing a configuration of a communication system 100. [Diagram 2] FIG. 1 is a diagram for explaining an overview of W-CDMA. [Diagram 3] FIG. 1 is a diagram for explaining an overview of W-CDMA. [Figure 4] 2 is a diagram showing the data structure of communication control information 20. FIG. [Diagram 5] 11 is a sequence diagram showing a download process of the communication control information 20. FIG. [Figure 6]13 is a flowchart showing an adaptive transmission power control process. [Figure 7] FIG. 11 is a diagram illustrating a basic configuration of a wireless base station 3 according to a second embodiment. [Figure 8] 1A to 1C are diagrams showing the transmission power characteristics, reception sensitivity characteristics, and reception strength characteristics of a conventional wireless terminal device, and 1D to 1F are diagrams showing the transmission power characteristics, reception sensitivity characteristics, and reception strength characteristics of a conventional wireless terminal device when only the upper limit value of the transmission power is lowered. [Figure 9] 1A to 1C are diagrams showing the transmission power characteristics, reception sensitivity characteristics, and reception strength characteristics of a conventional wireless terminal device, and FIG. 1D to 1F are diagrams showing the transmission power characteristics, reception sensitivity characteristics, and reception strength characteristics of a wireless base station 3 according to the present embodiment. [Figure 10] 13 is a flowchart showing a wireless communication control process. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0068] First Embodiment Next, a first embodiment of the present invention will be described. First, the configuration of a communication system 100 according to the present embodiment will be described.

[0069] FIG. 1 is a diagram showing a configuration of a communication system 100. As shown in FIG. 5, the communication system 100 provides communication services to users of wireless terminals 2 such as mobile phones, and is configured to include a wireless base station (BTS: Base Transceiver Station) 3 that is wirelessly connected to the wireless terminals 2, a wireless network controller (RNC: Radio Network Controller) 4 that is wirelessly connected to a plurality of wireless base stations 3, a subscriber exchange 5 connected to the wireless network controller 4, and an operation center 7 connected to the subscriber exchange 5 via a relay exchange 6.

[0070] In this embodiment, for the sake of simplicity, a single operations center 7, a relay exchange 6, and two subscriber exchanges 5 are illustrated, but the present invention is not limited to this configuration, and the number of these can be any number.

[0071] The communication system 100 adopts a zone system and has many wireless zones arranged in a service area, similar to a cellular system (PDC: Personal Digital Cellular telecommunication system), which is a mobile communication system in Japan. Communication control in each wireless zone is performed by a wireless base station 3. For example, when a wireless terminal 2 belonging to a wireless zone A1 communicates with another communication terminal, it is connected to a subscriber exchange 5 via a wireless base station 3 that controls communication in the wireless zone A1, and is connected from the subscriber exchange 5 to a relay exchange 6. In addition, since the wireless terminal 2 is mobile, when it moves from the wireless zone A1 to the outside of the zone, it belongs to an adjacent wireless zone A2. When a wireless terminal 2 belonging to a wireless zone A2 communicates with another communication terminal, it is connected to a subscriber exchange 5 via a wireless base station 3 that controls communication in the wireless zone A2, and is connected from the subscriber exchange 5 to a relay exchange 6. In this way, the wireless terminal 2 can communicate with another communication terminal by being connected to the wireless base station 3 that controls communication in the wireless zone to which it belongs via a wireless line.

[0072] In the communication system 100, logical channels consisting of information channels and control channels are prepared to control communication and wireless lines. The information channel is used by the wireless terminal 2 to transmit and receive voice signals and data signals, and when it is assigned to a specific wireless terminal 2, it is occupied by that wireless terminal 2 until the communication is completed. The control channel is a channel for transferring control signals necessary for connection control, and includes a broadcasting channel (BCCH: Broadcasting Control CHannel), which is a one-way channel only for downlinks to transfer information commonly notified to all wireless terminals 2 within a wireless zone, The channels include a common control channel (CCCH) that notifies the wireless terminal 2 of incoming calls and notifies the wireless terminal 2 of location registration requests, call requests, or data transmission requests that are randomly issued from the wireless terminal 2.

[0073] The wireless terminal 2 belongs to, for example, the wireless zone A1 by making a location registration request to the wireless base station 3 using the common control channel. When the wireless terminal 2 communicates with another communication terminal, the wireless terminal 2 transmits a call signal including the telephone number information of the communication destination to the wireless base station 3 using the common control channel. When the wireless base station 3 receives the call signal, the call signal is transmitted to the intermediate exchange 6 via the subscriber exchange 5. The intermediate exchange 6 then transmits an incoming call signal to the communication destination via the other subscriber exchange 5, and sets up a line between the communication destination and the wireless terminal 2. The wireless base station 3 assigns an available information channel in the wireless zone A1 to the wireless terminal 2. This allows the wireless terminal 2 to communicate with the communication destination.

[0074] As a wireless access method, for example, wideband code division multiple access (W-CDMA) is adopted.

[0075] 2 and 3 are diagrams for explaining an outline of W-CDMA. W-CDMA employs adaptive transmission power control. Adaptive transmission power control is based on the signal-interference power ratio (SIR). As shown in Figure 2, the wireless base station 3 measures the SIR after RAKE combining the despread signal, and if the measured value is greater than the target value, it transmits a command to the wireless terminal 2 to reduce the transmission power. In the opposite case, it transmits a command to increase the transmission power. The wireless terminal 2 that receives this command controls its transmission power in accordance with the command. By performing this operation at a high speed of once every 0.625 [ms], it is possible to reduce fluctuations in the reception level caused by fading. This can be eliminated by power control of the wireless base station 3, and the transmission power of the wireless terminal 2 can also be minimized.

[0076] In W-CDMA, as shown in Fig. 3, a plurality of cells are set in a concentric manner in a wireless zone covered by one wireless base station 3. In the example of Fig. 3, in a wireless zone A1 covered by the wireless base station 3, a concentric cell S1 is set in an area closest to the wireless base station 3. A concentric cell S2 is set in an area next closest to the wireless base station 3. A concentric cell S3 is set in an area farthest from the wireless base station 3. The transmission power of three wireless terminals 2a1, 2a2, and 2a3 belonging to the cell S1 is controlled so that the measured SIR values ​​of the wireless terminals 2a1, 2a2, and 2a3 become a target value SIR1. The transmission power of three wireless terminals 2b1, 2b2, and 2b3 belonging to the cell S2 is controlled so that the measured SIR values ​​of the wireless terminals 2b1, 2b2, and 2b3 become a target value SIR2. The transmission power of three wireless terminals 2c1, 2c2, and 2c3 belonging to cell S3 is controlled so that the measured SIR value of each of the wireless terminals 2c1, 2c2, and 2c3 becomes a target value SIR3. The relationship between the target values ​​is SIR1>SIR2>SIR3.

[0077] In this embodiment, control is performed to lower the upper limit of the transmission power of the wireless terminal 2, but in W-CDMA, for example, when the upper limit of the transmission power of the wireless terminal 2 belonging to cell S1 is lowered, if the measured SIR value when the wireless terminal 2 outputs with the lowered upper limit of the transmission power reaches the target value SIR1, the wireless terminal 2 is controlled as belonging to cell S1. If the measured SIR value does not reach the target value SIR1 but reaches the target value SIR2, the wireless terminal 2 is controlled as belonging to cell S2. If the measured SIR value does not reach the target value SIR2 but reaches the target value SIR3, the wireless terminal 2 is controlled as belonging to cell S3.

[0078] The wireless network controller 4 monitors the wireless line between the wireless terminal 2 and the wireless base station 3, and also performs wireless control such as allocating a wireless channel to the wireless terminal 2. The wireless network controller 4 is connected to a voice switch 51 and a packet switch 52. The wireless network controller 4 transmits a call signal received from the wireless terminal 2 to the voice switch 51, and transmits a data signal received from the wireless terminal 2 to the packet switch 52.

[0079] The subscriber exchange 5 is configured to include a voice exchange 51 and a packet exchange (LS / SGSN: Serving GPRS Support Node) 52 .

[0080] The voice exchange 51 relays call signals received from the wireless network control device 4 to the wireless base station 3 to which the destination wireless terminal 2 belongs, and also relays call signals received from the operation center 7 to the wireless network control device 4 via the relay voice exchange 61.

[0081] The packet switch 52 relays data signals received from the radio network control device 4 to the radio base station 3 to which the destination radio terminal 2 belongs, and also relays data signals received from the operation center 7 to the radio network control device 4 via the relay packet switch 62.

[0082] The local exchange 5 is connected to a Visitor Location Register (VLR) 53 .

[0083] The visitor location register 53 is a database that stores location registration information of the wireless terminal 2 for managing the wireless terminal 2 within the serving area covered by the local exchange 5. The visitor location register 53 can be provided outside or inside the local exchange 5 as long as it is configured to be accessible by the local exchange 5.

[0084] For example, when the subscriber exchange 5 receives a location registration request from the wireless terminal 2, it downloads the location registration information of the wireless terminal 2 from the home location register (HLR) 71, stores it in the visitor location register 53, and performs location registration processing based on the location registration information.

[0085] The relay exchange 6 is connected to a subscriber exchange 5, a gateway exchange 9, and a gateway (GW) 10. The gateway exchange 9 is connected to another gateway exchange 13 via a POI (Point Of Interface) 12, and the gateway 10 is connected to the Internet.

[0086] The relay exchange 6 is configured to include a relay voice exchange 61 and a relay packet exchange (GS / GGSN: Gateway GPRS Support Node) 62 .

[0087] The relay voice exchange 61 relays the call signal received from the voice exchange 51 to the operation center 7 , and also relays the call signal received from the operation center 7 to the voice exchange 51 .

[0088] The relay packet switch 62 relays data signals received from the packet switch 52 to the operation center 7 , and also relays data signals received from the operation center 7 to the packet switch 52 .

[0089] The operation center 7 has a server function that provides communication services to all wireless terminals 2, a usage restriction service that restricts the use of communication, and various services to which each wireless terminal 2 subscribes.

[0090] The operation center 7 is connected to a home location register 71. The home location register 71 is a database that stores user information (telephone numbers, IP addresses, authentication information, etc.) of all wireless terminals 2 within the coverage area under the jurisdiction of the operation center 7, contract service information, location registration information (location registration area, exchange in the location registration area), and information required for setting communication paths for the wireless terminals 2, as well as communication control information for the wireless terminals 2. Note that the home location register 71 can be provided outside or inside the operation center 7, as long as it is configured to be accessible by the operation center 7.

[0091] Next, the data structure of the communication control information will be described. FIG. 4 is a diagram showing the data structure of the communication control information 20. As shown in FIG.

[0092] As shown in Fig. 4, the home location register 71 stores the communication control information 20 of all the wireless terminals 2 in the area covered by the operation center 7. The communication control information 20 has one record registered for each wireless terminal 2. Each record includes a field for registering the telephone number of the wireless terminal 2, a field for registering the IP address of the wireless terminal 2, and a field for registering the upper limit of the transmission power of the wireless terminal 2. As the upper limit of the transmission power of the wireless terminal 2, a value (e.g., 0.1 [W]) lower than the maximum transmission power (e.g., 1 [W]) of the wireless terminal 2 can be set. Here, the maximum transmission power refers to the maximum transmission power that the wireless terminal 2 can realize in terms of its performance, or the maximum transmission power according to the standard that is required when the communication quality with the wireless base station is at the lowest level.

[0093] The upper limit of the transmission power is set by a setting process (upper limit of transmission power setting means) of the operation center 7. The upper limit of the transmission power may be set, for example, by a manufacturer, a distributor, or a communication carrier when the wireless terminal 2 is shipped, by a parent who is a guardian and gives the wireless terminal 2 to a child, or by the user. Upon receiving a request from these persons, the operation center 7 sets the upper limit of the transmission power of the target wireless terminal 2.

[0094] Next, the download process of the communication control information 20 will be described. FIG. 5 is a sequence diagram showing the download process of the communication control information 20. As shown in FIG.

[0095] The download process of the communication control information 20 is executed when the subscriber exchange 5 receives a location registration request from the wireless terminal 2. For the sake of simplicity, the wireless network control device 4 and the relay exchange 6 are omitted in Fig. 5.

[0096] 5, when the local exchange 5 receives a location registration request from the wireless terminal 2 via the wireless base station 3 and the wireless network control device 4 (step S100), it performs authentication processing of the requesting wireless terminal 2 with the operation center 7 (step S102). After the authentication processing is completed, the local exchange 5 transmits the location registration request to the operation center 7 (step S104).

[0097] Based on the telephone number of the requesting wireless terminal 2, the operation center 7 reads out the communication control information 20 corresponding to that wireless terminal 2 stored in the home location register 71 (step S106), and transmits the read communication control information 20 to the requesting wireless base station 3 (step S108).

[0098] The wireless base station 3 stores the received communication control information 20 in a database or the like (step S110).

[0099] Furthermore, the operation center 7 transmits the read communication control information 20 together with the location registration information to the requesting local exchange 5 (step S112).

[0100] The subscriber exchange 5 stores the communication control information 20 together with the received location registration information in the visitor location register 53 (step S114), and transmits a location registration response to the requesting wireless terminal 2 via the wireless base station device 3 and the wireless network control device 4 (step S116).

[0101] Next, the adaptive transmission power control process executed in the wireless base station 3 will be described. FIG. 6 is a flowchart showing the adaptive transmission power control process.

[0102] The adaptive transmission power control process is a process for performing adaptive transmission power control for W-CDMA among radio access controls, and when executed by the radio base station 3, as shown in FIG. 6, first the process proceeds to step S200.

[0103] In step S200, the upper limit value Pmax of the transmission power set for the wireless terminal device 2 that is the target of wireless access control (hereinafter, in the explanation of Figure 6, referred to as the target wireless terminal device 2) is read from the communication control information 20 corresponding to the target wireless terminal device 2 stored in a database or the like, and the process proceeds to step S202.

[0104] In step S202, the SIR of the target wireless terminal 2 is measured, and the process proceeds to step S204 to determine a target value Ptr of the transmission power of the target wireless terminal 2 so that the measured SIR value becomes the target value, and the process proceeds to step S206.

[0105] In step S206, it is determined whether the target value Ptr of the transmission power is greater than the current value Pcr of the transmission power of the target wireless terminal 2, and if it is determined that the target value Ptr is greater than the current value Pcr (YES), the process proceeds to step S208.

[0106] In step S208, it is determined whether the target value Ptr of the transmission power is greater than the upper limit value Pmax of the transmission power, and if it is determined that the target value Ptr is equal to or less than the upper limit value Pmax (NO), the process proceeds to step S210.

[0107] In step S210, a transmission power increase command to increase the transmission power to the target value Ptr is sent to the target wireless terminal 2, and the process proceeds to step S212, where the current transmission power value Pcr is set to the transmission power target value Ptr, and the process proceeds to step S214.

[0108] In step S214, it is determined whether or not the target value Ptr of the transmission power is smaller than the current value Pcr of the transmission power, and if it is determined that the target value Ptr is smaller than the current value Pcr (YES), the process proceeds to step S216.

[0109] In step S216, a transmission power reduction command to reduce the transmission power to the target value Ptr is sent to the target wireless terminal 2, and then the process proceeds to step S218, where the current transmission power value Pcr is set to the transmission power target value Ptr, the process ends, and the original process is resumed.

[0110] On the other hand, if it is determined in step S214 that the target value Ptr of the transmission power is equal to or greater than the current value Pcr of the transmission power (NO), the series of processes is ended and the process returns to the original process.

[0111] On the other hand, when it is determined in step S208 that the target value Ptr of the transmission power is greater than the upper limit value Pmax of the transmission power (YES), the process proceeds to step S214. In this case, a process is performed to move the target wireless terminal 2 from the current cell to the next farthest cell, or if the current cell is the farthest cell, a process is performed to move the target wireless terminal 2 to another wireless base station 3.

[0112] On the other hand, if it is determined in step S206 that the target value Ptr of the transmission power is equal to or less than the current value Pcr of the transmission power (NO), the process proceeds to step S214.

[0113] Next, the operation of this embodiment will be described. If a user or the like wishes to lower the upper limit of the transmission power of the wireless terminal 2, the user or the like accesses the operation center 7 from the wireless terminal 2 or other communication terminal and sets the upper limit of the transmission power to a value lower than the maximum transmission power of the wireless terminal 2.

[0114] When the operation center 7 receives a request from a user or the like, the upper limit of the transmission power of the target wireless terminal 2 is set in the communication control information 20 by a setting process.

[0115] When the upper limit value of the transmission power is set, the wireless base station 3 controls the transmission power of the wireless terminal 2 so that the upper limit value of the transmission power of the wireless terminal 2 becomes the value set in the communication control information 20 for that wireless terminal 2.

[0116] In this way, in this embodiment, the operations center 7 sets in the communication control information 20 for each wireless terminal 2 an upper limit value of the transmission power that is lower than the maximum transmission power of that wireless terminal 2, and the wireless base station 3 controls the transmission power of that wireless terminal 2 so that the upper limit value of the transmission power of the wireless terminal 2 becomes the value set in the communication control information 20 for that wireless terminal 2.

[0117] This makes it possible to reduce power consumption by restricting the upper limit of the transmission power of the wireless terminal device 2 at the user's discretion. Also, it is possible to weaken the effect of the radio frequency electromagnetic field on the human body.

[0118] In this embodiment, the setting process of the operation center 7 corresponds to the transmission power upper limit setting means of invention 1, steps S200 to S212 correspond to the wireless terminal control means of invention 1, and the maximum transmission power corresponds to the maximum upper limit of invention 1.

[0119] [Modification of the first embodiment] It should be noted that the first embodiment may also adopt the following configuration.

[0120] The first configuration, in the configuration of the above-mentioned first embodiment, includes a transmission power upper limit value acquisition means for acquiring from the wireless terminal 2 a value lower than the maximum transmission power of the wireless terminal 2, and the transmission power upper limit value setting means sets the value acquired from the wireless terminal 2 by the transmission power upper limit value acquisition means as the upper limit value of the transmission power of the wireless terminal 2. That is, when a user wishes to lower the upper limit value of the transmission power of his / her wireless terminal 2, the configuration is such that the upper limit value of the transmission power is set in his / her wireless terminal 2. Here, the transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6 or the operation center 7.

[0121] The second configuration is the same as the configuration of the first embodiment, except that it includes a transmission power upper limit value acquisition means for acquiring a value lower than the maximum transmission power of the wireless terminal 2 from the wireless terminal 2 related to the wireless terminal 2, and the transmission power upper limit value setting means sets the value acquired by the transmission power upper limit value acquisition means from the wireless terminal 2 related to the wireless terminal 2 as the upper limit value of the transmission power of the wireless terminal 2. For example, when a parent wants to lower the upper limit value of the transmission power of the wireless terminal 2 of the child, the upper limit value of the transmission power is set in the parent's wireless terminal 2. Here, the wireless terminal 2 related to the wireless terminal 2 includes, for example, the wireless terminal 2 of the communication destination, or the wireless terminal 2 owned by family, friends, employees, or other related parties. The transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6, or the operation center 7.

[0122] The third configuration, instead of the configuration of the first embodiment, comprises a transmission power upper limit storage means for storing, for each wireless terminal 2, a transmission power upper limit table in which a value lower than the maximum transmission power of the wireless terminal 2 is set as the upper limit of transmission power, and a wireless terminal control means for controlling the wireless terminal 2 so that the upper limit of transmission power of the wireless terminal 2 becomes the value set in the transmission power upper limit table for that wireless terminal 2. Here, the setting process (transmission power upper limit setting means) in the first embodiment does not need to be provided. Also, the transmission power upper limit storage means may be stored in the wireless base station 3, the wireless network control device 4, the subscriber switch 10, the local area network 11, the local area network 12, the local area network 13, the local area network 14, the local area network 15, the local area network 16, the local area network 17, the local area network 18, the local area network 19, the local area network 20, the local area network 21, the local area network 22, the local area network 23, the local area network 24, the local area network 25, the local area network 26, the local area network 27, the local area network 28, the local area network 29 ...9, the local area network 29, the local area network 29, the local area network 29, the local area network 29, the local area network 29 The wireless terminal control means may be provided in the relay exchange 5, the relay exchange 6 or the operation center 7. The same applies to the location where the wireless terminal control means is provided.

[0123] Even with this configuration, the same effects as those of the first embodiment can be obtained. The fourth configuration, in the above third configuration, further includes a transmission power upper limit value acquisition means for acquiring from the wireless terminal 2 a value lower than the maximum transmission power of the wireless terminal 2, and a transmission power upper limit value setting means for setting the value acquired from the wireless terminal 2 by the transmission power upper limit value acquisition means in a transmission power upper limit value table as the upper limit value of the transmission power of the wireless terminal 2. That is, when a user wishes to lower the upper limit value of the transmission power of his / her wireless terminal 2, the configuration is such that the upper limit value of the transmission power is set in his / her wireless terminal 2. Here, the transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6 or the operation center 7. The same applies to the location where the transmission power upper limit value setting means is provided.

[0124] The fifth configuration, in the third configuration, includes a transmission power upper limit value acquisition means for acquiring a value lower than the maximum transmission power of the wireless terminal 2 from the wireless terminal 2 related to the wireless terminal 2, and a transmission power upper limit value setting means for setting the value acquired by the transmission power upper limit value acquisition means from the wireless terminal 2 related to the wireless terminal 2 in the transmission power upper limit value table as the upper limit value of the transmission power of the wireless terminal 2. For example, when a parent wants to lower the upper limit value of the transmission power of the child's wireless terminal 2, the configuration is such that the upper limit value of the transmission power is set in the parent's wireless terminal 2. Here, the wireless terminal 2 related to the wireless terminal 2 is the same as above. Moreover, the transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6, or the operation center 7. Moreover, the same applies to the location where the transmission power upper limit value setting means is provided.

[0125] The sixth configuration, instead of the configuration of the first embodiment, is communicatively connected to a management device having a transmission power upper limit setting means for setting a value lower than the maximum transmission power of the wireless terminal 2 as the upper limit of transmission power for each wireless terminal 2, and is provided with a transmission power upper limit acquisition means for acquiring from the management device the value set by the transmission power upper limit setting means, and a wireless terminal control means for controlling the wireless terminal 2 so that the upper limit of transmission power of the wireless terminal 2 becomes the value acquired for that wireless terminal 2 by the transmission power upper limit acquisition means. In other words, this is a configuration in which the transmission power upper limit setting means is provided separately as a management device. Here, the management device is As long as it is separate from the transmission power upper limit value acquisition means and the wireless terminal device control means, it can also be configured as the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6 or the operation center 7. Also, as long as it is separate from the management device, the transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6 or the operation center 7. The same applies to the location where the wireless terminal device control means is provided.

[0126] Even with this configuration, the same effects as those of the first embodiment can be obtained. In the seventh configuration, in the sixth configuration, the management device includes a second transmission power upper limit value acquisition means for acquiring from the wireless terminal device 2 a value lower than the maximum transmission power of the wireless terminal device 2, and the transmission power upper limit value setting means sets the value acquired from the wireless terminal device 2 by the second transmission power upper limit value acquisition means as the upper limit value of the transmission power of the wireless terminal device 2. That is, in this configuration, when a user wishes to lower the upper limit value of the transmission power of his / her wireless terminal device 2, the user sets the upper limit value of the transmission power in his / her wireless terminal device 2. Here, the second transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6 or the operation center 7.

[0127] In the eighth configuration, in the sixth configuration, the management device includes a second transmission power upper limit value acquisition means for acquiring a value lower than the maximum transmission power of the wireless terminal 2 from the wireless terminal 2 related to the wireless terminal 2, and the transmission power upper limit value setting means sets the value acquired by the second transmission power upper limit value acquisition means from the wireless terminal 2 related to the wireless terminal 2 as the upper limit value of the transmission power of the wireless terminal 2. For example, when a parent wants to lower the upper limit value of the transmission power of the child's wireless terminal 2, the parent's wireless terminal 2 sets the upper limit value of the transmission power. Here, the wireless terminal 2 related to the wireless terminal 2 is the same as above. The second transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6, or the operation center 7.

[0128] The ninth configuration, instead of the configuration of the first embodiment, includes a transmission power upper limit value acquisition means that is communicably connected to a management device having a transmission power upper limit value storage means that stores a transmission power upper limit value table in which a value lower than the maximum transmission power of the wireless terminal 2 is set as the upper limit value of the transmission power for each wireless terminal 2, and acquires a value set in the transmission power upper limit value table from the management device, and a wireless terminal control means that controls the wireless terminal 2 so that the upper limit value of the transmission power of the wireless terminal 2 becomes the value acquired by the transmission power upper limit value acquisition means for the wireless terminal 2. That is, the configuration is such that the transmission power upper limit value storage means is provided separately as the management device. Here, the management device may be configured as the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6, or the operation center 7 as long as it is separate from the transmission power upper limit value storage means and the wireless terminal control means. Also, the setting process (transmission power upper limit value setting means) in the first embodiment may not be provided. Furthermore, if the transmission power upper limit storage means is separate from the management device, it can be provided in the radio base station 3, the radio network control device 4, the subscriber exchange 5, the transit exchange 6 or the operation center 7. The same applies to the location where the radio terminal device control means is provided.

[0129] Even with this configuration, the same effects as those of the first embodiment can be obtained. In the tenth configuration, in the ninth configuration, the management device includes a second transmission power upper limit value acquisition means for acquiring from the wireless terminal 2 a value lower than the maximum transmission power of the wireless terminal 2, and a transmission power upper limit value setting means for setting the value acquired from the wireless terminal 2 by the second transmission power upper limit value acquisition means in the transmission power upper limit value table as the upper limit value of the transmission power of the wireless terminal 2. That is, in this configuration, when a user wants to lower the upper limit value of the transmission power of his / her wireless terminal 2, the user sets the upper limit value of the transmission power in his / her wireless terminal 2. Here, the second transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6 or the operation center 7. The same applies to the location where the transmission power upper limit value setting means is provided.

[0130] In the eleventh configuration, in the ninth configuration, the management device includes a second transmission power upper limit value acquisition means for acquiring a value lower than the maximum transmission power of the wireless terminal 2 from the wireless terminal 2 related to the wireless terminal 2, and a transmission power upper limit value setting means for setting the value acquired by the second transmission power upper limit value acquisition means from the wireless terminal 2 related to the wireless terminal 2 in the transmission power upper limit value table as the upper limit value of the transmission power of the wireless terminal 2. For example, when a parent wants to lower the upper limit value of the transmission power of the child's wireless terminal 2, the parent's wireless terminal 2 sets the upper limit value of the transmission power. Here, the wireless terminal 2 related to the wireless terminal 2 is the same as above. Moreover, the second transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6, or the operation center 7. Moreover, the same applies to the location where the transmission power upper limit value setting means is provided.

[0131] The twelfth configuration, instead of the configuration of the first embodiment, includes a transmission power upper limit value acquisition means for acquiring a value lower than the maximum transmission power of the wireless terminal 2 from the wireless terminal 2 or a wireless terminal 2 related thereto, and a wireless terminal control means for controlling the wireless terminal 2 so that the upper limit value of the transmission power of the wireless terminal 2 becomes the value acquired by the transmission power upper limit value acquisition means from the wireless terminal 2 or a wireless terminal 2 related thereto. Here, the setting process (transmission power upper limit value setting means) in the first embodiment does not need to be provided. Also, the transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6, or the operation center 7. Also, the same applies to the location where the wireless terminal control means is provided.

[0132] Even with this configuration, the same effects as those of the first embodiment can be obtained. do. Second Embodiment Next, a second embodiment of the present invention will be described.

[0133] The relationship between a mobile communication system and this embodiment will be described below. A mobile communication system that connects mobile phones, mobile PCs with built-in communication devices, etc., is composed of at least a wireless terminal device 2, a wireless base station 3, a public communication network, and a "terminal device that is the other party in information transmission" (hereinafter referred to as the communication partner terminal device).

[0134] In a mobile communication system, when a communication is to be established from a wireless terminal 2 to a communication partner terminal, the wireless terminal 2 passes through a wireless base station 3, a public communication network, and is connected to the communication partner terminal.

[0135] In this embodiment, the conditions indicated by the expressions "normal" and "lower than normal" with respect to transmission power and receiving sensitivity are defined below.

[0136] The transmission power of a wireless terminal 2 in a mobile communication system cannot be intentionally changed by a user to a desired value. Instead, the strength of the radio waves received from a wireless base station 3 is measured, and the wireless base station 3 and wireless terminal 2 determine the transmission power of the wireless terminal 2 based on the result.

[0137] In this embodiment, the transmission power that has not been changed by a user or the like is referred to as the "normal transmission power," whereas the transmission power that has been intentionally changed lower by a user or the like is referred to as the "transmission power lower than normal."

[0138] First, the configuration of wireless base station 3 according to the present embodiment will be described. FIG. 7 is a diagram showing a basic configuration of a wireless base station 3 according to the second embodiment.

[0139] The wireless base station 3 is made up of an “antenna” 111 , a “receiving section” 410 , a “transmitting section” 470 , a “control signal generating section” 450 , and an “operating means” 114 .

[0140] The 'receiving section' 410 comprises at least a 'band limiter' 121 , a 'sensitivity controller' 122 , an 'automatic gain control amplifier' 123 , a 'channel selector' 126 and a 'demodulator' 128 .

[0141] A "received signal" 331 received by an "antenna" 111 is input to a "receiver" 410. A "demodulated signal" 332 is output from the "receiver" 410. The "demodulated signal" 332 includes "information transmitted by the base station".

[0142] The 'sensitivity controller' 122 can vary the reception sensitivity according to the 'correction control signal' 352 from the 'control signal generator' 450 .

[0143] The “transmitter” 470 comprises at least a “carrier generator” 171 , a “modulator” 172 and a “transmission power controller” 173 .

[0144] A “modulated signal” 374 including “information to be transmitted to a partner” is input to a “transmitter” 470. The “transmitter” 470 generates a “transmitted signal” 375 and outputs it to an “antenna” 111.

[0145] The 'transmission power controller' 173 can vary the transmission power according to the 'correction control signal' 352 from the 'control signal generator' 450 .

[0146] The 'operation means' 114 generates an 'operation signal' 315 based on an operation performed by a user or the like, and outputs it to a 'control signal generating section' 450 .

[0147] An "operation signal" 315 from the "operation means" 114 is input to a "control signal generating unit" 450. The "control signal generating unit" 450 outputs a "correction control signal" 352 determined based on the state of the "operation signal" 315. The "control signal generating unit" 450 outputs the generated "correction control signal" 352 to both the "transmitting unit" 470 and the "receiving unit" 410.

[0148] In other words, the 'transmitter' 470 and the 'receiver' 410 are controlled by operating the 'operating means' 114 .

[0149] Next, the operation of this embodiment will be described. First, the operation when the transmission power of wireless base station 3 is the "normal transmission power" will be described.

[0150] When the transmission power of the wireless base station 3 is the “normal transmission power”, the “control signal generating unit” 450 generates a “corrected control signal” 352 with a value that maintains the “normal transmission power” and the “normal receiving sensitivity”, and outputs this to the “transmitter” 470 and the “receiver” 410.

[0151] Since a “correction control signal” 352 having a value for maintaining the “normal transmission power” is input to the “transmission power controller” 173, which is a component of the “transmission unit” 470, the “transmission unit” 470 outputs a “transmission signal” 375 at the “normal transmission power”.

[0152] In addition, since a “correction control signal” 352 having a value that maintains the “normal receiving sensitivity” is input to the “sensitivity controller” 122, which is a component of the “receiving unit” 410, the “receiving unit” 410 generates a “demodulated signal” 332 with the “normal receiving sensitivity”.

[0153] Next, a problem that occurs when the transmission power of the wireless base station 3 is reduced will be described. The wireless base station 3 determines the transmission power according to the strength of the radio wave received from the wireless terminal 2 .

[0154] If the radio wave received from the wireless terminal 2 is strong, the wireless base station 3 reduces the transmission power. Conversely, if the radio wave received from the wireless terminal 2 is weak, the wireless base station 3 increases the transmission power.

[0155] Normally, the wireless base station 3 transmits with the minimum necessary transmission power. For example, when the wireless base station 3 can receive radio waves from the wireless terminal device 2, simply reducing the transmission power of the wireless base station 3 will prevent the radio waves from reaching the wireless terminal device 2 and communication will become impossible. Also, the "symmetry of communication" between the transmission power and reception sensitivity of the wireless base station 3 as seen from the wireless terminal device 2 will be lost. As a result, the wireless terminal device 2 will not be able to operate normally with respect to the wireless base station 3.

[0156] These problems and the method for solving them will be described in more detail below in comparison with the conventional method.

[0157] Figures 8(a) to (c) are diagrams showing the transmission power characteristics, reception sensitivity characteristics, and reception strength characteristics of a conventional wireless terminal device, and Figures 8(d) to (f) are diagrams showing the transmission power characteristics, reception sensitivity characteristics, and reception strength characteristics of a conventional wireless terminal device when only the upper limit value of the transmission power is lowered.

[0158] 9(a) to (c) are diagrams showing the transmission power characteristics, reception sensitivity characteristics and reception strength characteristics of a conventional wireless terminal device, and FIGS. 9(d) to (f) are diagrams showing the transmission power characteristics, reception sensitivity characteristics and reception strength characteristics of a wireless base station 3 according to the present embodiment.

[0159] The vertical axis 800 in Figures 8(a), (d) and 9(a), (d) indicates transmission power, the vertical axis 801 in Figures 8(b), (e) and 9(b), (e) indicates reception sensitivity, and the vertical axis 802 in Figures 8(c), (f) and 8(c), (f) indicates reception strength. The horizontal axis 803 in each graph in Figures 8 and 9 indicates the propagation loss (≈ distance) between a conventional wireless terminal and a wireless base station (or between the wireless terminal 2 and the wireless base station 3).

[0160] In a conventional wireless terminal, as shown in Fig. 8(a), the transmission power is controlled so that the transmission power increases as the propagation loss between the wireless terminal and the wireless base station increases (i.e., as the radio wave received from the wireless base station becomes weaker). When the transmission power reaches the maximum transmission power 804 that the wireless terminal can exert, it remains constant at the maximum transmission power 804, and it becomes impossible to transmit a signal to the wireless base station when the propagation loss becomes slightly higher than the point at which the maximum transmission power 804 is reached. On the other hand, as shown in Fig. 8(b), the reception sensitivity is set to the maximum reception sensitivity 805 that the wireless terminal can exert regardless of the propagation loss, so that the reception strength decreases from the maximum reception strength 815 as the propagation loss increases, as shown in Fig. 8(c), and when it drops to the allowable value 806, it becomes impossible to receive a signal from the wireless base station.

[0161] In this state, the range 807 in which the wireless terminal can transmit signals to the wireless base station and the range 808 in which the wireless terminal can receive signals from the wireless base station match, so "symmetry of communication" is maintained. This is because the system is designed to maintain "symmetry of communication" by taking into account the antenna characteristics and the noise figure of the receiving section. Therefore, when the propagation loss increases beyond the ranges 807 and 808 to the ranges 809 and 810, the wireless terminal cannot establish communication with the wireless base station and displays "out of range."

[0162] In contrast, when only the upper limit of the transmission power is lowered to a constant value 811, the transmission power remains constant at the constant value 811 after reaching the constant value 811, as shown in FIG. 8(d), and the wireless terminal cannot transmit a signal to the wireless base station when the propagation loss becomes slightly higher than the point at which the transmission power reaches the constant value 811. Therefore, the range 812 in which the wireless terminal can transmit a signal to the wireless base station is smaller than when the upper limit of the transmission power is not lowered. On the other hand, since the reception sensitivity is set to the maximum reception sensitivity 805 regardless of the propagation loss as shown in FIG. 8(e), the reception strength decreases from the maximum reception strength 815 as the propagation loss increases, as shown in FIG. 8(f), and when the reception strength decreases to the allowable value 806, the wireless terminal cannot receive a signal from the wireless base station. Therefore, the range 808 in which the wireless terminal can receive a signal from the wireless base station is the same as when the upper limit of the transmission power is not lowered.

[0163] In this state, the range 812 in which the wireless terminal can transmit signals to the wireless base station does not match the range 808 in which the wireless terminal can receive signals from the wireless base station, and so "symmetry of communication" is lost. In other words, when the propagation loss is in a range that exceeds the range 812 but does not exceed the range 808, a one-way communication state occurs in which signals cannot be transmitted to the wireless base station but can be received from the wireless base station, so that the wireless terminal cannot make a call to the wireless base station even though "out of range" is not displayed. This not only confuses the user, but also, as described above, the wireless base station and the base station network cannot operate normally with respect to the wireless terminal.

[0164] The same problem is also expected for wireless base stations. Therefore, in the wireless base station 3 according to the present embodiment, when the upper limit value of the transmission power is lowered to a fixed value 811 by operating the "operation means" 114 as shown in FIG. 9(d), the reception sensitivity is lowered to a fixed value 813 according to the lowered upper limit value 811 of the transmission power as shown in FIG. 9(e). For example, when the upper limit value of the transmission power is lowered from the maximum transmission power 804 (for example, 1 [W]) to the fixed value 811 (for example, 0.1 [W]), the reception sensitivity is lowered from the maximum reception sensitivity 805 (for example, 0 [dB]) to the fixed value 813 (for example, a value lowered by 10 [dB]). If the reception sensitivity is lowered, the reception intensity also decreases from a fixed value 816, which is a predetermined value (corresponding to the difference between the maximum reception sensitivity 805 and the fixed value 813) lower than the maximum reception intensity 815, as the propagation loss increases as shown in FIG. 9(f), and when it drops to the allowable value 806, it becomes impossible to receive a signal from the wireless terminal 2. Therefore, the range of the reception strength is narrowed, and the range 814 in which the wireless base station 3 can receive a signal from the wireless terminal 2 is narrower than when the reception sensitivity is not reduced.

[0165] As a result, a range 812 in which wireless base station 3 can transmit signals to wireless terminal 2 coincides with a range 814 in which wireless base station 3 can receive signals from wireless terminal 2, thereby maintaining "symmetry of communication."

[0166] The receiving sensitivity may be reduced according to the upper limit of the transmission power, but in this case, it is preferable to reduce the sensitivity so that the range (receiving range) in which the wireless base station 3 can receive signals from the wireless terminal 2 matches the range (transmission range) in which the wireless base station 3 can transmit signals to the wireless terminal 2. However, the receiving range and the transmission range do not necessarily have to match, and as long as the mismatch between the receiving range and the transmission range can be reduced compared to the case where the receiving sensitivity is not reduced at all, the degree to which the "symmetry of communication" is lost can be reduced. Therefore, when the upper limit of the transmission power is reduced, the receiving sensitivity may be reduced so that the receiving range matches the transmission range or the mismatch is reduced.

[0167] Next, the operation when the transmission power of the wireless base station 3 is changed to “transmission power lower than normal” and the operation to prevent the above-mentioned malfunction will be described using an example in which a variable attenuator is used as the “sensitivity controller” 122.

[0168] Here, assume that a user or the like manually attempts to change the transmission power, which increases or decreases within a predetermined range as a normal operation, to 1 / 10.

[0169] When a user or the like operates the 'operation means' 114 , a 'correction control signal' 352 is input from the 'control signal generating unit' 450 to the 'sensitivity controller' 122 (variable attenuator) and the 'transmission power controller' 173 .

[0170] Here, the "correction control signal" 352 is a value that reduces the signal to 1 / 10. The "transmission power controller" 173 sets the transmission power to 1 / 10 of the original maximum transmission power.

[0171] The "sensitivity controller" 122 (variable attenuator) sets the attenuation ratio to 1 / 10. Therefore, the wireless base station 3 can switch the transmission power to "lower than normal transmission power" or back to "normal transmission power" by operation of the user, etc., and in conjunction with the switching of the transmission power, the receiving sensitivity also switches to "lower than normal receiving sensitivity" or back to "normal receiving sensitivity."

[0172] A method for lowering the receiving sensitivity of the "receiving unit" 410 will be described below. The "sensitivity controller" 122, which is a component of the "receiving section" 410, can be implemented by a variable attenuator and a variable amplifier.

[0173] In addition to using these, the reception sensitivity of the 'receiving unit' 410 can be lowered by narrowing the gain variable range of the 'automatic gain control amplifier' 123 .

[0174] In this manner, in this embodiment, wireless base station 3 lowers the upper limit of transmission power through operation of "operation means" 114, and lowers the receiving sensitivity in accordance with the lowered upper limit of transmission power.

[0175] This allows the user or other person to intentionally suppress the upper limit of the transmission power of the wireless base station 3, thereby reducing power consumption. It also reduces the impact of the radio frequency electromagnetic field on the human body. Furthermore, it is possible to reduce the degree to which the "symmetry of communication" is broken.

[0176] [Modification of the second embodiment] In addition, the second embodiment may also adopt the following configuration.

[0177] The first configuration, instead of the configuration of the above-described second embodiment, includes reception performance lowering means for lowering reception performance, and transmission power upper limit value lowering means for lowering the upper limit value of transmission power in accordance with the reception performance lowered by the reception performance lowering means.

[0178] Even with this configuration, the same effects as those of the second embodiment can be obtained. The second configuration, instead of the configuration of the above-described second embodiment, includes a transmission power upper limit value lowering means for lowering the upper limit value of the transmission power, and a reception status notifying means for notifying the wireless terminal device 2 of the reception status when the reception performance is lowered or assumed to be lowered in accordance with the upper limit value of the transmission power lowered by the transmission power upper limit value lowering means.

[0179] Even with this configuration, the same effects as those of the second embodiment can be obtained. The third configuration, instead of the configuration of the above-mentioned second embodiment, includes a reception status notifying means for notifying the wireless terminal 2 of the reception status when the reception performance is degraded or is assumed to be degraded, and a transmission power upper limit value lowering means for lowering the upper limit value of the transmission power according to the reception performance when it is degraded or is assumed to be degraded.

[0180] Even with this configuration, the same effects as those of the second embodiment can be obtained. In the second and third configurations, when the wireless base station 3 actually reduces the reception performance, the notification content is the reception status when the reception performance is reduced according to the reduced upper limit of the transmission power, and when the wireless base station 3 does not reduce the reception performance but makes it appear to the wireless terminal 2 that it has been reduced, the notification content is the reception status when the reception performance is reduced according to the reduced upper limit of the transmission power. In analog communication, the reception status is, for example, "The current reception strength is ** [dB]," and in digital communication, it is, for example, "The current error rate is **." However, it is sufficient for the transmission signal to include only the information "**."

[0181] In the fourth configuration, in the configuration of the second embodiment or the first configuration, the reception performance lowering means lowers the reception performance for each wireless terminal 2. However, the reception performance for a specific wireless terminal 2 or all wireless terminals 2 may be lowered.

[0182] In the fifth configuration, in the configuration of the second embodiment, or the first, second, third or fourth configuration, the transmission power upper limit value lowering means lowers the upper limit value of the transmission power to each wireless terminal 2. However, the upper limit value of the transmission power to a specific wireless terminal 2 or to all wireless terminals 2 may be lowered.

[0183] The sixth configuration is the configuration of the second embodiment described above, or the first, second, third, fourth or fifth configuration, in which communication with a wireless terminal 2 is established in wireless transmission and reception at a radio wave intensity stronger than a pre-registered radio wave intensity, depending on the reception performance.

[0184] In the seventh configuration, in the configuration of the second embodiment described above, or in the first, second, third, fourth, fifth or sixth configuration, the receiving performance is receiving sensitivity.

[0185] The eighth configuration is the configuration of the second embodiment described above, or the first, second, third, fourth, fifth or sixth configuration, in which the reception performance is a reference value for determining that communication is established.

[0186] In the ninth configuration, in the configuration of the second embodiment described above, or the first, second, third, fourth, fifth or sixth configuration, the receiving performance is the allowable error rate of the received data.

[0187] The tenth configuration, instead of the configuration of the second embodiment, includes a transmission power upper limit increasing means for each wireless terminal 2, which increases the upper limit of the transmission power to that wireless terminal 2 above the reference upper limit. If the transmission power of the wireless base station 3 increases, the wireless terminal 2 reduces its own transmission power, so that the power consumption can be reduced by suppressing the upper limit of the transmission power of the wireless terminal 2 at the user's discretion. In addition, the effect of the radio frequency electromagnetic field on the human body can be weakened.

[0188] The eleventh configuration includes a receiving performance increasing means for increasing the receiving performance according to the upper limit of the transmission power increased by the transmission power upper limit increasing means in the tenth configuration. The receiving performance can be the seventh, eighth or ninth configuration.

[0189] With this configuration, it is possible to reduce the degree to which the "symmetry of communication" is lost.

[0190] The twelfth configuration, instead of the configuration of the second embodiment, includes an antenna having a gain higher than a reference gain, and an antenna control means for controlling the antenna so that the upper limit of the transmission power to the target wireless terminal device 2 is increased above the reference upper limit. If the transmission power of the wireless base station 3 increases, the wireless terminal device 2 reduces its own transmission power, so that the power consumption can be reduced by suppressing the upper limit of the transmission power of the wireless terminal device 2 at the user's discretion. In addition, the effect of the radio frequency electromagnetic field on the human body can be weakened.

[0191] The thirteenth configuration includes a receiving performance increasing means for increasing the receiving performance according to the upper limit of the transmission power increased by the antenna control means in the twelfth configuration. The seventh, eighth or ninth configuration can be adopted for the receiving performance.

[0192] With this configuration, it is possible to reduce the degree to which the "symmetry of communication" is lost.

[0193] The configuration of the first embodiment or the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, or thirteenth configuration in the modified example of the second embodiment may be applied to the configuration of the first embodiment or the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, or twelfth configuration in the modified example of the third embodiment. That is, a configuration for setting an upper limit value of transmission power or a configuration for storing a table may be used. For example, when the third configuration in the modified example of the first embodiment is applied to the tenth configuration in the modified example of the second embodiment, a storage means is provided for each wireless terminal 2 for storing a transmission power upper limit value table setting an upper limit value of the transmission power of the wireless base station 3 to that wireless terminal 2, and the transmission power upper limit value increasing means is configured to increase, for each wireless terminal 2, the upper limit value of the transmission power to that wireless terminal 2 to the value set in the transmission power upper limit value table for that wireless terminal 2.

[0194] Third embodiment Next, a third embodiment of the present invention will be described. Note that only the differences from the first embodiment will be described.

[0195] The wireless base station 3 executes normal adaptive transmission power control processing in W-CDMA instead of the adaptive transmission power control processing in FIG. 6, and in this embodiment executes wireless communication control processing shown in the flowchart of FIG.

[0196] FIG. 10 is a flowchart showing the wireless communication control process. When the wireless communication control process is executed in the wireless base station 3, as shown in FIG. 10, first, the process proceeds to step S300.

[0197] In step S300, the upper limit value Pmax of the transmission power set for the wireless terminal 2 that is the target of wireless access control (hereinafter, in the explanation of Figure 10, referred to as the target wireless terminal 2) is read from the communication control information 20 corresponding to the target wireless terminal 2 stored in a database or the like, and the process proceeds to step S302.

[0198] In step S302, the current value Pcr of the transmission power of the target wireless terminal 2 is received from the target wireless terminal 2, and the process proceeds to step S304 to determine whether the current value Pcr of the transmission power is greater than the upper limit value Pmax of the transmission power. If it is determined that the current value Pcr is less than or equal to the upper limit value Pmax (NO), the process proceeds to step S306.

[0199] In step S306, the process for carrying out normal wireless access control in W-CDMA is executed, and the series of processes is terminated, and the process returns to the original process.

[0200] On the other hand, if it is determined in step S304 that the current value Pcr of the transmission power is greater than the upper limit Pmax of the transmission power (YES), the series of processes is ended and the process returns to the original process.

[0201] Next, the operation of this embodiment will be described. If a user or the like wishes to lower the upper limit of the transmission power of the wireless terminal 2, the user or the like accesses the operation center 7 from the wireless terminal 2 or other communication terminal and sets the upper limit of the transmission power to a value lower than the maximum transmission power of the wireless terminal 2.

[0202] When the operation center 7 receives a request from a user or the like, the upper limit of the transmission power of the target wireless terminal 2 is set in the communication control information 20 by a setting process.

[0203] When an upper limit value for the transmission power is set, the wireless base station 3 performs wireless access control only when the transmission power of the wireless terminal 2 is smaller than the value set in the communication control information 20 for that wireless terminal 2.

[0204] In this manner, in the present embodiment, the wireless base station 3 receives the current value Pcr of the transmission power of the wireless terminal 2, and if the received current value Pcr of the transmission power exceeds the upper limit value Pmax of the transmission power set for that wireless terminal 2, prohibits communication with that wireless terminal 2.

[0205] As a result, when the wireless terminal 2 communicates with the wireless base station 3 at a transmission power exceeding the upper limit value Pmax, the wireless terminal 2 cannot communicate with the wireless base station 3, so that the power consumption can be reduced by restricting the transmission power of the wireless terminal 2 at the user's discretion. Also, the effect of the radio frequency electromagnetic field on the human body can be weakened.

[0206] In this embodiment, step S302 corresponds to the transmission power value acquisition means of invention 28 or 29, steps S300 and S304 correspond to the communication prohibition means of invention 28 or 29, and the setting process of the operation center 7 corresponds to the transmission power upper limit value setting means of invention 29.

[0207] [Modification of the third embodiment] It should be noted that the third embodiment may also adopt the following configuration.

[0208] The first configuration is the same as the configuration of the third embodiment, except that it further comprises a transmission power upper limit value acquisition means for acquiring from the wireless terminal 2 a value lower than the maximum transmission power of the wireless terminal 2, and the transmission power upper limit value setting means sets the value acquired from the wireless terminal 2 by the transmission power upper limit value acquisition means as the upper limit value of the transmission power of the wireless terminal 2. That is, when a user wishes to lower the upper limit value of the transmission power of his / her wireless terminal 2, the configuration is such that the upper limit value of the transmission power is set in his / her wireless terminal 2. Here, the transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6 or the operation center 7.

[0209] The second configuration is the same as the third embodiment, except that the second configuration includes a transmission power upper limit value acquisition means for acquiring a value lower than the maximum transmission power of the wireless terminal 2 from the wireless terminal 2 related to the wireless terminal 2, and the transmission power upper limit value setting means sets the value acquired by the transmission power upper limit value acquisition means from the wireless terminal 2 related to the wireless terminal 2 as the upper limit value of the transmission power of the wireless terminal 2. For example, when a parent wants to lower the upper limit value of the transmission power of the wireless terminal 2 of the child, the upper limit value of the transmission power is set in the parent's wireless terminal 2. Here, the wireless terminal 2 related to the wireless terminal 2 includes, for example, the wireless terminal 2 of the communication destination, or the wireless terminal 2 owned by family, friends, employees, or other related parties. The transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6, or the operation center 7.

[0210] The third configuration, instead of the configuration of the third embodiment, includes a transmission power upper limit storage means for storing a transmission power upper limit table in which a value lower than the maximum transmission power of the wireless terminal 2 is set as the upper limit value of transmission power for each wireless terminal 2, and a wireless terminal control means for controlling the wireless terminal 2 so that the upper limit value of the transmission power of the wireless terminal 2 becomes the value set in the transmission power upper limit table for the wireless terminal 2. Here, the setting process (transmission power upper limit setting means) in the third embodiment does not need to be provided. Also, the transmission power upper limit storage means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6, or the operation center 7. Also, the same applies to the location where the wireless terminal control means is provided.

[0211] Even with this configuration, the same effects as those of the third embodiment can be obtained. do. The fourth configuration, in the above third configuration, further includes a transmission power upper limit value acquisition means for acquiring from the wireless terminal 2 a value lower than the maximum transmission power of the wireless terminal 2, and a transmission power upper limit value setting means for setting the value acquired from the wireless terminal 2 by the transmission power upper limit value acquisition means in a transmission power upper limit value table as the upper limit value of the transmission power of the wireless terminal 2. That is, when a user wishes to lower the upper limit value of the transmission power of his / her wireless terminal 2, the configuration is such that the upper limit value of the transmission power is set in his / her wireless terminal 2. Here, the transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6 or the operation center 7. The same applies to the location where the transmission power upper limit value setting means is provided.

[0212] The fifth configuration, in the third configuration, further includes a transmission power upper limit value acquisition means for acquiring a value lower than the maximum transmission power of a wireless terminal device 2 from a wireless terminal device 2 related to the wireless terminal device 2, and a transmission power upper limit value setting means for setting the value acquired from a wireless terminal device 2 related to the wireless terminal 2 by the transmission power upper limit value acquisition means in a transmission power upper limit value table as an upper limit value of the transmission power of the wireless terminal 2. For example, when a parent wishes to lower the upper limit of the transmission power of the child's wireless terminal 2, the upper limit of the transmission power is set in the parent's wireless terminal 2. Here, the wireless terminal 2 related to the wireless terminal 2 is the same as above. The transmission power upper limit acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6 or the operation center 7. The same also applies to the location where the transmission power upper limit setting means is provided.

[0213] The sixth configuration, instead of the configuration of the third embodiment, includes a transmission power upper limit value acquisition means communicably connected to a management device having a transmission power upper limit value setting means for setting a value lower than the maximum transmission power of the wireless terminal 2 as the upper limit value of the transmission power for each wireless terminal 2, and acquiring the value set by the transmission power upper limit value setting means from the management device, and a wireless terminal control means for controlling the wireless terminal 2 so that the upper limit value of the transmission power of the wireless terminal 2 becomes the value acquired by the transmission power upper limit value acquisition means for the wireless terminal 2. That is, the transmission power upper limit value setting means is provided separately as a management device. Here, the management device may be configured as a wireless base station 3, a wireless network control device 4, a subscriber exchange 5, a relay exchange 6, or an operation center 7, as long as it is separate from the transmission power upper limit value acquisition means and the wireless terminal control means. Also, the transmission power upper limit value acquisition means may be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6, or the operation center 7, as long as it is separate from the management device. The same applies to the location where the wireless terminal control means is provided.

[0214] Even with this configuration, the same effects as those of the third embodiment can be obtained. In the seventh configuration, in the sixth configuration, the management device includes a second transmission power upper limit value acquisition means for acquiring from the wireless terminal device 2 a value lower than the maximum transmission power of the wireless terminal device 2, and the transmission power upper limit value setting means sets the value acquired from the wireless terminal device 2 by the second transmission power upper limit value acquisition means as the upper limit value of the transmission power of the wireless terminal device 2. That is, in this configuration, when a user wishes to lower the upper limit value of the transmission power of his / her wireless terminal device 2, the user sets the upper limit value of the transmission power in his / her wireless terminal device 2. Here, the second transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6 or the operation center 7.

[0215] In the eighth configuration, in the sixth configuration, the management device includes a second transmission power upper limit value acquisition means for acquiring a value lower than the maximum transmission power of the wireless terminal 2 from the wireless terminal 2 related to the wireless terminal 2, and the transmission power upper limit value setting means sets the value acquired by the second transmission power upper limit value acquisition means from the wireless terminal 2 related to the wireless terminal 2 as the upper limit value of the transmission power of the wireless terminal 2. For example, when a parent wants to lower the upper limit value of the transmission power of the child's wireless terminal 2, the parent's wireless terminal 2 sets the upper limit value of the transmission power. Here, the wireless terminal 2 related to the wireless terminal 2 is the same as above. The second transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6, or the operation center 7.

[0216] The ninth configuration, instead of the configuration of the third embodiment, includes a transmission power upper limit value acquisition means that is communicably connected to a management device having a transmission power upper limit value storage means that stores a transmission power upper limit value table in which a value lower than the maximum transmission power of the wireless terminal 2 is set as the upper limit value of the transmission power for each wireless terminal 2, and acquires a value set in the transmission power upper limit value table from the management device, and a wireless terminal control means that controls the wireless terminal 2 so that the upper limit value of the transmission power of the wireless terminal 2 becomes the value acquired by the transmission power upper limit value acquisition means for the wireless terminal 2. That is, the configuration is such that the transmission power upper limit value storage means is provided separately as the management device. Here, the management device may be configured as the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6, or the operation center 7 as long as it is separate from the transmission power upper limit value storage means and the wireless terminal control means. Also, the setting process (transmission power upper limit value setting means) in the third embodiment may not be provided. Furthermore, if the transmission power upper limit storage means is separate from the management device, it can be provided in the radio base station 3, the radio network control device 4, the subscriber exchange 5, the transit exchange 6 or the operation center 7. The same applies to the location where the radio terminal device control means is provided.

[0217] Even with this configuration, the same effects as those of the third embodiment can be obtained. In the tenth configuration, in the ninth configuration, the management device includes a second transmission power upper limit value acquisition means for acquiring from the wireless terminal 2 a value lower than the maximum transmission power of the wireless terminal 2, and a transmission power upper limit value setting means for setting the value acquired from the wireless terminal 2 by the second transmission power upper limit value acquisition means in the transmission power upper limit value table as the upper limit value of the transmission power of the wireless terminal 2. That is, in this configuration, when a user wants to lower the upper limit value of the transmission power of his / her wireless terminal 2, the user sets the upper limit value of the transmission power in his / her wireless terminal 2. Here, the second transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6 or the operation center 7. The same applies to the location where the transmission power upper limit value setting means is provided.

[0218] In the eleventh configuration, in the ninth configuration, the management device includes a second transmission power upper limit value acquisition means for acquiring a value lower than the maximum transmission power of the wireless terminal 2 from the wireless terminal 2 related to the wireless terminal 2, and a transmission power upper limit value setting means for setting the value acquired by the second transmission power upper limit value acquisition means from the wireless terminal 2 related to the wireless terminal 2 in the transmission power upper limit value table as the upper limit value of the transmission power of the wireless terminal 2. For example, when a parent wants to lower the upper limit value of the transmission power of the child's wireless terminal 2, the parent's wireless terminal 2 sets the upper limit value of the transmission power. Here, the wireless terminal 2 related to the wireless terminal 2 is the same as above. Moreover, the second transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6, or the operation center 7. Moreover, the same applies to the location where the transmission power upper limit value setting means is provided.

[0219] The twelfth configuration, instead of the configuration of the third embodiment, includes a transmission power upper limit value acquisition means for acquiring a value lower than the maximum transmission power of the wireless terminal 2 from the wireless terminal 2 or a wireless terminal 2 related thereto, and a wireless terminal control means for controlling the wireless terminal 2 so that the upper limit value of the transmission power of the wireless terminal 2 becomes the value acquired by the transmission power upper limit value acquisition means from the wireless terminal 2 or a wireless terminal 2 related thereto. Here, the setting process (transmission power upper limit value setting means) in the third embodiment does not need to be provided. Also, the transmission power upper limit value acquisition means can be provided in the wireless base station 3, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6, or the operation center 7. Also, the same applies to the location where the wireless terminal control means is provided.

[0220] Even with this configuration, the same effects as those of the third embodiment can be obtained. The thirteenth configuration is an alternative to the configuration of the third embodiment, in which the wireless terminal 2 receives a current value Pcr of the transmission power of the wireless base station 3, and when the received current value Pcr of the transmission power exceeds the upper limit Pmax of the transmission power set for the wireless base station 3, the wireless terminal 2 prohibits communication with the wireless base station 3. The present invention is also applicable to one-to-one communication relationships such as transceivers. In other words, the present invention is widely applicable to wireless terminals 2, wireless base stations 3, transceivers, and other wireless transmitters and receivers.

[0221] With this configuration, if the communication partner communicates with a transmission power equal to or higher than a predetermined value, the communication partner cannot communicate with this wireless transceiver, so that the power consumption can be reduced by restricting the transmission power of the communication partner at the user's discretion. Also, the effect of radio frequency electromagnetic fields on the human body can be reduced.

[0222] [Other Modifications] In the above second embodiment and its variant, the strength of the received radio waves is measured, and the upper limit of the transmission power is reduced based on this, and a state in which good communication can be expected is determined. However, in digital communications, instead of measuring the strength of the received radio waves, the error rate of the received data may be measured, and the receiving sensitivity may be reduced based on the error rate, and a state in which good communication can be expected may be determined.

[0223] In the second embodiment and its modified example, the receiving sensitivity is reduced according to the upper limit of the transmission power reduced by the operation of the "operation means" 114, but the present invention is not limited to this. In digital communication, the allowable error rate of the received data can be reduced according to the upper limit of the transmission power reduced by the operation of the "operation means" 114. Specifically, in the "normal transmission power" state, it is determined that communication is established when the error rate of the received data is equal to or lower than a first threshold value (allowable error rate), whereas in the "lower than normal transmission power" state, it is determined that communication is established when the error rate of the received data is equal to or lower than a second threshold value (allowable error rate) that is lower than the first threshold value.

[0224] In addition, in the second embodiment and its modified example, the upper limit of the transmission power is lowered by operating the "operation means" 114, and the reception sensitivity is lowered according to the lowered upper limit of the transmission power. However, the present invention is not limited to this, and the following configuration may also be adopted.

[0225] As a first configuration, a "storage means" is provided that stores fixed information indicating a value lower than the maximum transmission power as a fixed value of the upper limit of transmission power, and the upper limit of transmission power is fixed to a value lower than the maximum transmission power by the fixed information in the "storage means", and the reception sensitivity is fixed to a value lower than the maximum reception sensitivity according to the fixed upper limit of transmission power. In this case, the "operation means" 114 does not need to be provided.

[0226] As a second configuration, a "storage means" is provided that stores fixed information indicating a value lower than the maximum reception performance as a fixed value of reception performance (for example, reception sensitivity, a reference value when judging that communication is established, or an allowable value of the error rate of received data), and the reception performance is fixed to a value lower than the maximum reception performance by the fixed information in the "storage means", and the upper limit value of the transmission power is fixed to a value lower than the maximum transmission power according to the fixed reception performance. Here, the maximum reception performance means the maximum reception performance that the wireless transceiver can realize in terms of its performance, or the maximum reception performance according to the standard required when the communication quality with the wireless base station is at a minimum. In this case, the "operation means" 114 does not need to be provided.

[0227] In addition, in the second embodiment and its modified example, not only a configuration in which the upper limit of the transmission power is lowered (hereinafter referred to as transmission control) and the reception sensitivity is lowered (hereinafter referred to as reception control) by a single operation, but also (1) a configuration in which transmission control and reception control are performed by a plurality of operations, (2) a configuration in which transmission control is performed by a first operation (one or more operations) and then reception control is performed by a second operation (one or more operations), (3) a configuration in which reception control is performed by a first operation (one or more operations) and then transmission control is performed by a second operation (one or more operations), or (4) a configuration in which only transmission control is performed by a predetermined operation (one or more operations) and reception control is performed so that the reception range matches the transmission range or the mismatched portion is reduced, regardless of the operation, or (5) a configuration in which only reception control is performed by a predetermined operation (one or more operations) and transmission control is performed so that the reception range matches the transmission range or the mismatched portion is reduced, regardless of the operation. Also, the predetermined operation that triggers the transmission control or reception control may be common to the operation that activates another function. For example, if the operation is common to the operation for increasing and decreasing the volume of a call, the upper limit of the transmission power can be decreased in accordance with the operation for decreasing the volume of a call.

[0228] In the second embodiment and its modified example, as shown in Figs. 9(a) and 9(d), only the upper limit value of the transmission power among the transmission power characteristics is reduced. However, the present invention is not limited to this, and it is also possible to reduce the entire transmission power characteristics, for example.

[0229] In addition, in the above-mentioned second embodiment and its modified example, as shown in Figures 9(b) and (e), the receiving sensitivity is configured to be reduced to a constant value 813 regardless of the propagation loss. However, this is not limited to this, and it is also possible to configure it so that, for example, the receiving sensitivity is reduced in stages from the maximum receiving sensitivity 805 to a constant value 813 as the propagation loss increases.

[0230] In the second embodiment and its modification, the wireless base station 3 is configured to lower the upper limit of the transmission power by operating the “operation means” 114 and to lower the receiving sensitivity according to the lowered upper limit of the transmission power. However, in FIG. 9, when the current transmission power is the maximum transmission power 804 and is lowered, the upper limit is set to a value (constant value 811) lower than the transmission power required for communication with the wireless terminal 2 (maximum transmission power 804), so that the transmission power can be suppressed.

[0231] In the above-described second embodiment and its modification, the wireless base station 3 is configured to lower the upper limit of the transmission power and to lower the reception sensitivity in accordance with the lowered upper limit of the transmission power. However, the present invention is not limited to this, and the following configuration may also be adopted.

[0232] In a first configuration, the upper limit of the transmission power of the wireless base station 3 is a value lower than the maximum transmission power according to the standard required when the communication quality with the communication partner (e.g., wireless terminal device 2) is at the lowest level, and the receiving performance of the wireless base station 3 is a value lower than the maximum receiving performance according to the standard required when the communication quality with the communication partner is at the lowest level. That is, unlike the configuration in which the upper limit of the transmission power and the receiving sensitivity are lowered as in the above-mentioned second embodiment and its modified example, this is a configuration in which the upper limit of the transmission power and the receiving sensitivity are set to low values ​​from the very beginning.

[0233] As a second configuration, the upper limit of the transmission power of the wireless base station 3 is a value lower than the maximum transmission power required under the standard when the communication quality with the communication partner (for example, the wireless terminal 2) is at the lowest level, and the reception status when the reception performance of the wireless base station 3 is set to a value lower than the maximum reception performance required under the standard when the communication quality with the communication partner is at the lowest level is notified to the communication partner. That is, unlike the configuration in which the upper limit of the transmission power and the reception sensitivity are lowered as in the above-mentioned second embodiment and its modified example, this is a configuration in which the upper limit of the transmission power and the reception sensitivity are set to low values ​​from the very beginning.

[0234] As a third configuration, the upper limit value of the transmission power of the wireless base station 3 is lowered to a value lower than the maximum upper limit value, and when a transmission power higher than the lowered upper limit value of the transmission power is received from the communication partner required for communication, a notification is made. In other words, it is not necessary to lower the reception performance of the wireless base station 3, but a notification is made so that it is at least clear that reception has occurred even in an area where the reception range does not match the transmission range.

[0235] As a fourth configuration, the upper limit of the transmission power of the wireless base station 3 is a value lower than the maximum transmission power required by the standard when the communication quality with the communication partner is at a minimum, and when a transmission power higher than the upper limit of the transmission power is received from the communication partner, a notification is made. In other words, the reception performance of the wireless base station 3 does not necessarily need to be lowered, but even in an area where the reception range does not match the transmission range, a notification is made so that it is at least clear that reception has occurred.

[0236] As a fifth configuration, in the third and fourth configurations, when a signal is received from a communication partner with which communication is possible with a transmission power equal to or lower than the upper limit of the transmission power, notification is made in a first notification mode (e.g., voice pattern 1 or vibration pattern 1), and when a signal is received from a communication partner with which communication requires a transmission power higher than the upper limit of the transmission power, notification is made in a second notification mode different from the first notification mode (e.g., voice pattern 2 or vibration pattern 2).

[0237] Moreover, the second embodiment and its modified example can also be applied to congestion control and the like. Specifically, the system includes anomaly detection means for detecting anomalies in the communication network (for example, congestion, failures (including equipment or line failures), artificial restrictions, and other anomalies in the communication network), and a transmission power upper limit value lowering means for lowering the upper limit value of the transmission power of the wireless base station 3 when an anomaly is detected by the anomaly detection means. This reduces the wireless zone covered by the wireless base station 3, making it possible to reduce the number of wireless terminals 2 that are subject to wireless access control. Therefore, it is expected that communication will be performed efficiently when an anomaly occurs in the communication network, enabling many people to communicate.

[0238] In the above first to third embodiments and their modifications, the upper limit of the transmission power is set by accessing the operation center 7, but the present invention is not limited to this, and the upper limit of the transmission power can be set by calling a specific telephone number (for example, 0.1 [W] for 0990-XX-XXX1, 0.01 [W] for 0990-XX-XXX2, and 0.001 [W] for 0990-XX-XXX3). This allows the setting to be done simply by calling a specific telephone number, making it easy to set the upper limit of the transmission power.

[0239] In the above third embodiment and its modified example, the process in step S302 is configured to receive the current value Pcr of the transmission power of the target wireless terminal 2 from the target wireless terminal 2, but this is not limiting, and if the current value Pcr of the transmission power of the target wireless terminal 2 is held by internal processing such as adaptive transmission power control processing, the current value Pcr of the transmission power of the target wireless terminal 2 can be obtained from internal processing of the wireless base station 3. In addition, this is not limiting, and the current value Pcr of the transmission power of the target wireless terminal 2 can be obtained from the wireless terminal 2 or other communication terminals, the wireless network control device 4, the subscriber exchange 5, the relay exchange 6, or the operation center 7 related to the target wireless terminal 2.

[0240] Furthermore, in the modified example of the second embodiment described above, as the tenth configuration, a transmission power upper limit value increasing means is provided for each wireless terminal device 2, which increases the upper limit value of the transmission power to that wireless terminal device 2 above the reference upper limit value. However, without being limited to this, the configuration may also be such that an abnormality detection means is provided to detect abnormalities in the communication network (for example, congestion in the communication network, failures (including equipment or line failures), artificial restrictions, and other abnormalities), and the transmission power upper limit value increasing means increases the upper limit value of the transmission power to that wireless terminal device 2 above the reference upper limit value for each wireless terminal device 2 when an abnormality is detected by the abnormality detection means.

[0241] With this configuration, the wireless terminal 2 can communicate with low power consumption when an abnormality occurs. This reduces the possibility of communication failure during abnormal conditions. do.

[0242] In addition, in the modification of the second embodiment, as a twelfth configuration, An antenna having a gain higher than the reference gain and a target wireless terminal 2 The antenna is controlled so that the upper limit of the transmission power to the However, the present invention is not limited to this, and may be applied to a case where an abnormality in a communication network occurs. (For example, congestion of communication networks, failures (including equipment or line failures), artificial regulations The antenna control means is provided with an abnormality detection means for detecting an abnormality (other abnormalities), When an abnormality is detected by the detection means, the transmission power to the target wireless terminal 2 is The antenna is controlled so that the upper limit value of the It is also possible.

[0243] With this configuration, the wireless terminal 2 can communicate with low power consumption when an abnormality occurs. This reduces the possibility of communication failure during abnormal conditions. do. [Explanation of symbols]

[0244] 100...communication system, 2...wireless terminal device, 3...wireless base station device, 4...wireless network control device, 5...subscriber exchange, 51...voice exchange, 52...packet exchange, 53...visitor location register, 6...intermediate exchange, 61...intermediate voice exchange, 62...intermediate packet exchange, 7...operation center, 71...home location register, 9,13...gateway exchange, 10...gateway, 12...POI, 20... Communication control information, 111...antenna, 114...operation means, 121...band limiter, 122...sensitivity controller, 123...automatic gain control amplifier, 126...channel selector, 128...demodulator, 171...carrier generator, 172...modulator, 173...transmission power controller, 315...operation signal, 331...received signal, 332...demodulated signal, 352...correction control signal, 374...modulated signal, 375...transmitted signal, 410...receiving section, 450...control signal generating section, 470...transmitting section

Claims

1. A communication system capable of wirelessly connecting to a plurality of wireless terminals, a transmission power upper limit value setting means for setting an upper limit value of transmission power for each of the wireless terminal devices, the upper limit value being lower than a maximum upper limit value of the wireless terminal device; a wireless terminal control means for controlling the wireless terminal so that an upper limit value of the transmission power of the wireless terminal becomes a value set by the transmission power upper limit value setting means for the wireless terminal.

2. In claim 1, a transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from the wireless terminal device, A communication system according to claim 1, wherein the transmission power upper limit setting means sets the value acquired from the wireless terminal device by the transmission power upper limit acquisition means as the upper limit of the transmission power of the wireless terminal device.

3. In claim 1, a transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device; The transmission power upper limit setting means sets a value acquired by the transmission power upper limit acquisition means from a wireless terminal device related to the wireless terminal device as an upper limit value of the transmission power of the wireless terminal device.

4. A communication system capable of wirelessly connecting to a plurality of wireless terminals, a transmission power upper limit value storage means for storing a transmission power upper limit value table for each of the wireless terminal devices, the transmission power upper limit value being set to a value lower than the maximum upper limit value of the wireless terminal device; a wireless terminal control means for controlling the wireless terminal so that an upper limit value of the transmission power of the wireless terminal becomes a value set in the transmission power upper limit value table for the wireless terminal.

5. In claim 4, a transmission power upper limit value acquisition means for acquiring a value lower than the maximum upper limit value of the wireless terminal device from the wireless terminal device; a transmission power upper limit setting means for setting a value acquired from the wireless terminal device by the transmission power upper limit acquisition means in the transmission power upper limit table as an upper limit value of the transmission power of the wireless terminal device.

6. In claim 4, a transmission power upper limit value acquisition means for acquiring a value lower than the maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device; a transmission power upper limit setting means for setting in the transmission power upper limit table, a value acquired from a wireless terminal device related to the wireless terminal device by the transmission power upper limit acquisition means, as an upper limit value of the transmission power of the wireless terminal device.

7. A communication system capable of wirelessly connecting to a plurality of wireless terminals, a management device that is communicatively connected to the wireless terminal device and includes a transmission power upper limit setting means for setting an upper limit value of transmission power of the wireless terminal device to a value lower than a maximum upper limit value of the wireless terminal device; a transmission power upper limit value acquisition means for acquiring the value set by the transmission power upper limit value setting means from the management device; a wireless terminal control means for controlling the wireless terminal so that the upper limit value of the transmission power of the wireless terminal becomes the value acquired by the transmission power upper limit value acquisition means for the wireless terminal.

8. In claim 7, the management device includes a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from the wireless terminal device, A communication system according to claim 1, wherein the transmission power upper limit setting means sets the value acquired from the wireless terminal device by the second transmission power upper limit acquisition means as the upper limit of the transmission power of the wireless terminal device.

9. In claim 7, the management device includes a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device; The transmission power upper limit value setting means sets the value acquired by the second transmission power upper limit value acquisition means from a wireless terminal device related to the wireless terminal device as the upper limit value of the transmission power of the wireless terminal device.

10. A communication system capable of wirelessly connecting to a plurality of wireless terminals, a management device that is communicatively connected to the wireless terminal device and includes a transmission power upper limit value storage means for storing a transmission power upper limit value table in which a value lower than the maximum upper limit value of the wireless terminal device is set as the upper limit value of transmission power for each of the wireless terminal devices; a transmission power upper limit value acquisition means for acquiring a value set in the transmission power upper limit value table from the management device; a wireless terminal control means for controlling the wireless terminal so that the upper limit value of the transmission power of the wireless terminal becomes the value acquired by the transmission power upper limit value acquisition means for the wireless terminal.

11. In claim 10, the management device has a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from the wireless terminal device; a transmission power upper limit setting means for setting, in the transmission power upper limit table, a value acquired from the wireless terminal device by the second transmission power upper limit acquisition means as an upper limit value of the transmission power of the wireless terminal device.

12. In claim 10, the management device includes a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device; a transmission power upper limit setting means for setting in the transmission power upper limit table, a value acquired from a wireless terminal device related to the wireless terminal device by the second transmission power upper limit acquisition means, as an upper limit value of the transmission power of the wireless terminal device.

13. A communication system capable of wirelessly connecting to a plurality of wireless terminals, a transmission power upper limit value acquisition means for acquiring a value lower than the maximum upper limit value of the wireless terminal device from the wireless terminal device or a wireless terminal device related thereto; and a wireless terminal control means for controlling the wireless terminal so that the upper limit value of the transmission power of the wireless terminal becomes the value acquired from the wireless terminal or a wireless terminal related thereto by the transmission power upper limit value acquisition means.

14. A communication system capable of wirelessly connecting to a plurality of wireless terminals, a transmission power upper limit increasing means for increasing an upper limit of transmission power to the wireless terminal device above a reference upper limit, for each of the wireless terminal devices;

15. In claim 14, a reception performance increasing means for increasing reception performance in accordance with the upper limit of transmission power increased by said transmission power upper limit increasing means.

16. A communication system capable of wirelessly connecting to a plurality of wireless terminals, an antenna having a gain higher than a reference gain; A communication system comprising: antenna control means for controlling the antenna so that an upper limit value of transmission power to a target wireless terminal device is increased above a reference upper limit value.

17. In claim 16, a reception performance increasing means for increasing reception performance in response to an increase in the upper limit of transmission power caused by said antenna control means,

18. A communication system capable of wirelessly connecting to a plurality of wireless terminals, a transmission power upper limit value lowering means for lowering an upper limit value of transmission power; a reception performance lowering means for lowering reception performance in accordance with the upper limit of transmission power lowered by said transmission power upper limit lowering means.

19. A communication system capable of wirelessly connecting to a plurality of wireless terminals, A reception performance lowering means for lowering reception performance; a transmission power upper limit lowering means for lowering an upper limit of transmission power in accordance with the reception performance lowered by said reception performance lowering means.

20. A communication system capable of wirelessly connecting to a plurality of wireless terminals, a transmission power upper limit value lowering means for lowering an upper limit value of transmission power; a reception status notifying means for notifying the wireless terminal device of the reception status when reception performance is lowered or assumed to be lowered in accordance with the upper limit of transmission power lowered by the transmission power upper limit lowering means.

21. A communication system capable of wirelessly connecting to a plurality of wireless terminals, a reception status notifying means for notifying the wireless terminal of a reception status when reception performance is degraded or when the reception performance is assumed to be degraded; a transmission power upper limit lowering means for lowering the upper limit of the transmission power in accordance with the reception performance when lowered or when assumed to be lowered.

22. In any one of claims 18 and 19, The communication system according to claim 1, wherein the reception performance lowering means lowers the reception performance for each of the wireless terminals.

23. In any one of claims 18 to 22, The communication system according to claim 1, wherein the transmission power upper limit lowering means lowers an upper limit of transmission power to each of the wireless terminals.

24. In any one of claims 18 to 23, A communication system which establishes communication with said wireless terminal device in wireless transmission and reception with radio wave strength stronger than a pre-registered radio wave strength depending on the reception performance.

25. In any one of claims 15, 17 to 24, A communication system, wherein the receiving performance is receiving sensitivity.

26. In any one of claims 15, 17 to 24, A communication system, wherein the reception performance is a reference value for determining whether communication has been established.

27. In any one of claims 15, 17 to 24, A communication system, wherein the reception performance is a tolerable error rate of received data.

28. A communication system capable of wirelessly connecting to a plurality of wireless terminals, a transmission power value acquiring means for acquiring a value of a transmission power of the wireless terminal device; a communication prohibition means for prohibiting communication with the wireless terminal device when the value of the transmission power acquired by the transmission power value acquisition means is equal to or exceeds a predetermined value.

29. 29. In claim 28, a transmission power upper limit value setting means for setting an upper limit value of transmission power for each of the wireless terminal devices, the upper limit value being lower than a maximum upper limit value of the wireless terminal device; The communication prohibition means prohibits communication with the wireless terminal device when the value of the transmission power acquired for the wireless terminal device by the transmission power value acquisition means is equal to or exceeds the value set for the wireless terminal device by the transmission power upper limit setting means.

30. 30. In claim 29, a transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from the wireless terminal device, A communication system according to claim 1, wherein the transmission power upper limit setting means sets the value acquired from the wireless terminal device by the transmission power upper limit acquisition means as the upper limit of the transmission power of the wireless terminal device.

31. 30. In claim 29, a transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device; The transmission power upper limit setting means sets a value acquired by the transmission power upper limit acquisition means from a wireless terminal device related to the wireless terminal device as an upper limit value of the transmission power of the wireless terminal device.

32. 29. In claim 28, a transmission power upper limit value storage means for storing, for each of the wireless terminals, a transmission power upper limit value table in which a value lower than a maximum upper limit value of the wireless terminal is set as an upper limit value of transmission power, The communication prohibition means prohibits communication with the wireless terminal device when the value of the transmission power acquired by the transmission power value acquisition means for the wireless terminal device is equal to or exceeds the value set in the transmission power upper limit value table for the wireless terminal device.

33. In claim 32, a transmission power upper limit value acquisition means for acquiring a value lower than the maximum upper limit value of the wireless terminal device from the wireless terminal device; a transmission power upper limit value setting means for setting, in the transmission power upper limit value table, a value acquired from the wireless terminal device by the transmission power upper limit value acquisition means as an upper limit value of the transmission power of the wireless terminal device.

34. In claim 32, a transmission power upper limit value acquisition means for acquiring a value lower than the maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device; a transmission power upper limit setting means for setting in the transmission power upper limit table, a value acquired from a wireless terminal device related to the wireless terminal device by the transmission power upper limit acquisition means, as an upper limit value of the transmission power of the wireless terminal device.

35. 29. In claim 28, a management device that is communicatively connected to the wireless terminal device and includes a transmission power upper limit setting means for setting an upper limit value of transmission power of the wireless terminal device to a value lower than a maximum upper limit value of the wireless terminal device; a transmission power upper limit value acquisition means for acquiring the value set by the transmission power upper limit value setting means from the management device, The communication prohibition means prohibits communication with the wireless terminal device when the value of the transmission power acquired for the wireless terminal device by the transmission power value acquisition means is equal to or exceeds the value acquired for the wireless terminal device by the transmission power upper limit value acquisition means.

36. 36. The method of claim 35, the management device includes a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from the wireless terminal device, A communication system according to claim 1, wherein the transmission power upper limit setting means sets the value acquired from the wireless terminal device by the second transmission power upper limit acquisition means as the upper limit of the transmission power of the wireless terminal device.

37. 36. The method of claim 35, the management device includes a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device; The transmission power upper limit value setting means sets the value acquired by the second transmission power upper limit value acquisition means from a wireless terminal device related to the wireless terminal device as the upper limit value of the transmission power of the wireless terminal device.

38. 29. In claim 28, a management device that is communicatively connected to the wireless terminal device and includes a transmission power upper limit value storage means for storing a transmission power upper limit value table in which a value lower than the maximum upper limit value of the wireless terminal device is set as the upper limit value of transmission power for each of the wireless terminal devices; a transmission power upper limit value acquisition means for acquiring a value set in the transmission power upper limit value table from the management device, The communication prohibition means prohibits communication with the wireless terminal device when the value of the transmission power acquired for the wireless terminal device by the transmission power value acquisition means is equal to or exceeds the value acquired for the wireless terminal device by the transmission power upper limit value acquisition means.

39. 39. In claim 38, the management device has a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from the wireless terminal device; a transmission power upper limit setting means for setting, in the transmission power upper limit table, a value acquired from the wireless terminal device by the second transmission power upper limit acquisition means as an upper limit value of the transmission power of the wireless terminal device.

40. 39. In claim 38, the management device includes a second transmission power upper limit value acquisition means for acquiring a value lower than a maximum upper limit value of the wireless terminal device from a wireless terminal device related to the wireless terminal device; a transmission power upper limit setting means for setting in the transmission power upper limit table, a value acquired from a wireless terminal device related to the wireless terminal device by the second transmission power upper limit acquisition means, as an upper limit value of the transmission power of the wireless terminal device.

41. 29. In claim 28, a transmission power upper limit value acquisition means for acquiring a value lower than the maximum upper limit value of the wireless terminal device from the wireless terminal device or a wireless terminal device related thereto; The communication prohibition means prohibits communication with the wireless terminal device when the value of the transmission power acquired for the wireless terminal device by the transmission power value acquisition means is equal to or exceeds the value acquired from the wireless terminal device or a wireless terminal device related to it by the transmission power upper limit value acquisition means.

42. A transmission power value acquisition means for acquiring a transmission power value of a communication partner; a communication prohibition means for prohibiting communication with the communication partner when the value of the transmission power acquired by the transmission power value acquisition means is equal to or exceeds a predetermined value.

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