JP2006033601A - Transmission power setting method in terminal device for ad hoc radio communications network, terminal device for ad hoc radio communications network used for the transmission power setting, and the ad hoc radio communications network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission power setting method for an ad hoc radio communication network terminal device used at an ad hoc radio communication network configured with radio terminal devices, and being capable of operating at a low power and reducing electric wave interference caused by the low power, by enabling optimality of an output power using a simple configuration. <P>SOLUTION: In establishing transmission power of a transmission signal sent from a transmission source terminal to each of transmission destination terminals, the following steps are performed at the transmission source terminal. Each connection request signal is transmitted from the transmission source terminal, in the order of small electric power, an intermediate electric power and a maximum power for the transmission power. An acknowledgement signal, including an identification information, is received from a transmission destination terminal receiving the connection request signal, and the identification information is extracted from the acknowledgement signal. The extracted identification information is collated with an identification information registered, beforehand; and if there is a matched identification information, the transmission power of the connection request signal is made to associate with the matched identification information to register at a memory of the transmission source terminal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transmission power setting method in an ad hoc wireless communication network terminal device, an ad hoc wireless communication network terminal device used for the transmission power setting, and an ad hoc wireless communication network.

  In a conventional wireless terminal device, transmission power when performing wireless communication is fixed at a certain level. Therefore, the range in which the wireless terminal device can transmit is also kept constant. In this case, when the distance between the wireless terminal device of the transmission source and the wireless terminal device of the transmission destination is short, transmission is performed with excessive transmission power. There is a problem that decreases.

On the other hand, for the wireless terminal device operated under the generalization of the wireless communication center device, the S / N ratio in the operation state of the wireless terminal device is measured, and the transmission power level is determined based on this S / N ratio. Power control method by automatic control method, method of automatically obtaining transmission power level of own station by obtaining reception state of communication partner, or method of automatically controlling transmission power level corresponding to distance from communication partner Has been proposed (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 5-160777 “Wireless Transmission Power Control System”

  However, in the above-described conventional method, each wireless terminal device needs to have both a transmission antenna and a reception antenna when measuring the S / N ratio. Also, when using the reception status of the communication partner, if the transmission data of the local station is the communication partner and it is not correctly received, the transmission power is increased, so transmission with the necessary transmission power can be performed, but more than necessary There is a possibility of transmission with large power. Further, in order to use the distance to the communication partner, a time information transmitting station is required in addition to the wireless communication center device and the wireless communication terminal.

  The present invention has been made in view of the above-described problems, and an object of the present invention is used for an ad hoc wireless communication network including wireless terminal devices, and optimizes output power with a simple configuration. In addition to providing a transmission power setting method in an ad hoc wireless communication network terminal device capable of realizing low power consumption and reduction of radio wave interference by low power consumption by enabling the transmission power setting method, An object is to provide an ad hoc wireless communication network terminal device and an ad hoc wireless communication network.

  The first method invention of the present invention has the following features. That is, when one of a plurality of terminal devices constituting an ad hoc wireless communication network is a transmission source terminal and the remaining terminal devices are transmission destination terminals, transmission signals from the transmission source terminal to each of the transmission destination terminals are transmitted. In setting the transmission power, the transmission terminal performs the following.

  (A) Identification information for individually identifying all transmission destination terminals is registered in advance in the memory of the transmission source terminal, and transmission power is set to minimum power, maximum power, and minimum and maximum intermediate power, respectively. As the transmission level, a minimum transmission level, a maximum transmission level, and an intermediate transmission level are registered.

  (B) A connection request signal is transmitted from the transmission source terminal in the order of transmission power of minimum power, intermediate power, and maximum power.

  (C) A response signal including identification information is received from the transmission destination terminal that has received the connection request signal, and the identification information is extracted from the response signal.

  (D) If there is identification information that matches the extracted identification information with previously registered identification information, the identification information that matches the transmission power of the connection request signal is associated with Register in the memory.

(E) The correspondence with the identification information that matches the transmission power is
(E-1) When the transmission power is the minimum power, the minimum transmission level is set to the minimum power.
(E-2) When the transmission power is intermediate power, among the matching identification information, register the intermediate transmission level set to the intermediate power only for the identification information whose minimum transmission level is unregistered, and (e- 3) When the transmission power is the maximum power, among the matching identification information, the maximum transmission level set to the maximum power is registered only for the identification information whose minimum transmission level and intermediate transmission level are not registered.

  The second method invention of the present invention has the following features. That is, when one of a plurality of terminal devices constituting an ad hoc wireless communication network is a transmission source terminal and the remaining terminal devices are transmission destination terminals, transmission signals from the transmission source terminal to each of the transmission destination terminals are transmitted. In setting the transmission power, the transmission terminal performs the following.

  (A) Identification information for individually identifying all transmission destination terminals is registered in advance in the memory of the transmission source terminal, and transmission power is set to minimum power, maximum power, and minimum and maximum intermediate power, respectively. As the transmission level, a minimum transmission level, a maximum transmission level, and an intermediate transmission level are registered.

  (B) A connection request signal is transmitted from the transmission source terminal in the order of transmission power of maximum power, intermediate power, and minimum power.

  (C) A response signal including identification information is received from the transmission destination terminal that has received the connection request signal, and the identification information is extracted from the response signal.

  (D) If there is identification information that matches the extracted identification information with previously registered identification information, the identification information that matches the transmission power of the connection request signal is associated with Register in memory.

(E) The correspondence with the identification information that matches the transmission power is
(E-1) When the transmission power is the minimum power, the minimum transmission level set to the minimum power is registered,
(E-2) When the transmission power is intermediate power, register the intermediate transmission level to be set to intermediate power. (E-3) When the transmission power is maximum power, set the maximum transmission level to be set to maximum power. sign up.

  The third method of the present invention has the following characteristics. That is, when one of a plurality of terminal devices constituting an ad hoc wireless communication network is a transmission source terminal and the remaining terminal devices are transmission destination terminals, transmission signals from the transmission source terminal to each of the transmission destination terminals are transmitted. In setting the transmission power, the transmission terminal performs the following.

  (A) The identification information for individually identifying all the transmission destination terminals is registered in advance in the memory of the transmission source terminal, and the maximum transmission level is registered as the transmission level for setting the transmission power to the maximum power. deep.

  (B) A connection request signal is transmitted with the maximum power from the transmission source terminal.

  (C) A response signal including identification information and reception power information at the transmission destination terminal of the connection request signal is received from the transmission destination terminal that has received the connection request signal, and the identification information and the reception power are extracted from the response signal. .

  (D) When there is identification information that matches the extracted identification information with previously registered identification information, the transmission calculated using the transmission power of the connection request signal and the reception power at the destination terminal The level and the matching identification information are associated with each other and registered in the memory of the transmission source terminal.

  In calculating the transmission level described above, it is preferable that the transmission level is obtained by adding a margin to the difference between the transmission power of the connection request signal and the reception power at the transmission destination terminal.

  In addition, after the transmission level is calculated, it is preferable to do the following.

  (E) A confirmation signal including information on received power at the transmission source terminal of the response signal is transmitted to the transmission destination terminal specified by the extracted identification information.

  (F) A test signal including identification information and reception power information of the confirmation signal is received from the transmission destination terminal that has received the confirmation signal, and the reception power of the identification information and the confirmation signal is extracted from the test signal.

  (G) A confirmation signal including information on the received power of the test signal is transmitted to the transmission destination terminal specified by the extracted identification information.

  In order to implement the above-described method invention, a wireless terminal device for an ad hoc wireless communication network according to the present invention includes a transmission / reception antenna, a transmission / reception data control unit, a transmission / reception level control unit, a transmission unit, a transmission power setting unit, a reception unit, and reception power. A detection unit is provided.

  The transmission unit and the reception unit are provided in parallel so as to connect the transmission / reception data control unit and the transmission / reception antenna.

  The transmission / reception level control unit is connected to the transmission unit via a transmission power setting unit, and the transmission power setting unit sets transmission power at the transmission unit in response to a transmission power setting signal from the transmission / reception level control unit. .

  The reception unit is connected to the transmission / reception level control unit via the reception power detection unit, and the reception power detection unit detects reception power at the reception unit and transmits a reception power signal to the transmission / reception level control unit.

  In order to achieve the above-described object, an ad hoc wireless communication network of the present invention includes the above-described wireless terminal device for an ad hoc wireless communication network.

  According to the transmission power setting method in the terminal device for an ad hoc wireless communication network of the first method invention, the connection request signal is transmitted in the order of minimum power, intermediate power and maximum power. Since the transmission power is set according to the response signal with respect to the connection request signal transmitted with the transmission power, the transmission power can be set to the optimum transmission power.

  In addition, if the connection request signal is transmitted in the order of maximum power, intermediate power, and minimum power according to the second method invention, it is possible to set the optimum transmission power and include it in the response signal. The transmission power can be set regardless of whether or not the transmission level is registered for the transmission source terminal specified by the identification information, so that in addition to the optimal transmission power setting, the process of setting the transmission power is easy. A further effect is obtained.

  Further, according to the third method invention, a connection request signal is transmitted to each transmission destination terminal with the maximum power, and the transmission is extracted from the transmitted maximum power and a response signal from each transmission destination terminal. Since the transmission level is calculated from the received power information at the destination terminal, the transmission power is set for all the destination terminals that can communicate with the maximum transmission power by transmitting the connection request signal once. Can do.

  Moreover, in calculating the transmission level, the difference is set to the difference between the transmission power of the connection request signal and the reception power at the transmission destination terminal, so that the transmission power can be set to an appropriate transmission power.

  Furthermore, the validity of the set transmission power can be determined by transmitting a confirmation signal with the transmission power set according to the transmission level after calculation of the transmission level and receiving a response signal for the confirmation signal.

  According to the ad hoc wireless communication network terminal device of the present invention, it is possible to optimize the output power by setting the transmission power at the transmission unit in response to the transmission power setting signal from the transmission / reception level control unit. Therefore, low power consumption can be realized.

  According to the ad hoc wireless communication network including the above-described ad hoc wireless communication network terminal device, since the optimization of transmission power is measured in each wireless communication network terminal device, radio interference is reduced and wireless communication is not involved. Communication can also be performed between terminal devices.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the configuration and the arrangement relationship are merely schematically shown to the extent that the present invention can be understood. In the following, a preferred configuration example of the present invention will be described, but it is merely a preferred example. Therefore, the present invention is not limited to the following embodiment.

(First embodiment)
With reference to FIG. 1, an ad hoc wireless communication network terminal device (hereinafter also simply referred to as a terminal device) used in the transmission power setting method of the first embodiment will be described. FIG. 1 is a schematic diagram for explaining a configuration of a terminal device.

  The terminal device 10 includes a transmission / reception antenna 41, a transmission unit 21, a transmission power setting unit 31, a reception unit 23, a reception power detection unit 33, a transmission / reception data control unit 63, and a transmission / reception level control unit 65. The transmission / reception data control unit 63 and the transmission / reception level control unit 65 are configured by MPU (Microprocessing Unit) 50 as functional means. The MPU 50 may have a well-known configuration, and includes a central processing unit (CPU) 51, a RAM (Random Access Memory) 53 and a ROM (Read Only Memory) 55 as memories. . The CPU 51 includes a control unit 61 and a transmission / reception data control unit 63 and a transmission / reception level control unit 65 as the functional units described above. The control means 61 provided in the CPU 51 reads the program recorded in the ROM 55 or the like so as to be readable, and performs control for execution of the program, whereby transmission / reception as functional means is performed in other areas of the CPU. A data control unit 63 and a transmission / reception level control unit 65 are realized. Further, as is well known, the control means 61 performs necessary control for operating the MPU 50. However, since this is not the gist of the present invention, description thereof will be omitted.

  Further, the terminal device 10 can be configured to include input means such as a keyboard and a microphone, output means such as a display and a speaker, and a storage device. Description is omitted.

  The transmission unit 21 and the reception unit 23 are provided in parallel so as to connect the transmission / reception data control unit 63 and the transmission / reception antenna 41. The signal generated by the transmission / reception data control unit 63 is transmitted (also referred to as transmission) from the transmission / reception antenna 41 to another terminal device via the transmission unit 21. A signal transmitted from another terminal device is received by the transmission / reception antenna 41 and then transmitted to the transmission / reception data control unit 63 via the reception unit 23. The transmission unit 21 is configured to include an amplification unit at the subsequent stage, and can set an amplification factor, that is, transmission power in accordance with a command from the transmission power setting unit 31.

  The transmission / reception level control unit 65 selects the transmission power of the signal transmitted from the transmission unit 21 from two or more different predetermined powers from the minimum power to the maximum power for each other terminal device that is the transmission destination. Either transmission power can be set. When the transmission power is the minimum power, the maximum power, and the minimum and maximum intermediate power, the minimum transmission level, the maximum transmission level, and the intermediate transmission level are recorded in the ROM 55 by the program as the transmission levels set for these transmission powers. Suppose that Further, it is assumed that identification information for identifying all terminal devices that can configure the wireless communication network is registered in the ROM 55 by a program. In this embodiment, it is assumed that these transmission levels and identification information are registered in the ROM 55 in advance, but instead of doing so, they may be written to other memories such as a RAM in a readable manner as needed. . In such a case, it is possible to cope with addition of a transmission level or addition of a new terminal device.

  The transmission / reception level control unit 65 uses, as a transmission level table, identification information (for example, a MAC address in the case of a wireless LAN) of the transmission destination terminal device and a transmission level for the terminal device as an external storage device (in the RAM 53 or the MPU 50). Registration or reading is performed. In response to an instruction from the input means, the transmission / reception level control unit 65 reads a predetermined transmission level from the ROM 55 and generates a transmission power setting signal, or transmits identification information and transmission to the instructed destination terminal. The level is read from the transmission level table, and a transmission power setting signal corresponding to the designated transmission destination terminal is generated.

  The transmission / reception level control unit 65 is connected to the transmission power setting unit 31 and sends a transmission power setting signal to the transmission power setting unit 31. The transmission power setting unit 31 that has received the transmission power setting signal sets the transmission power of the signal transmitted from the transmission unit 21 based on the transmission power setting signal to the transmission power corresponding to the transmission level specified by the transmission / reception level control unit 65. Set to.

  The transmission / reception level control unit 65 is connected to the reception power detection unit 33. The reception power detection unit 33 detects the reception power of the signal received by the reception unit 23 and sends this reception power to the transmission / reception level control unit 65 as a reception power detection signal. The transmission / reception level control unit 65 records the received power as a corresponding reception level in the RAM 53 or the external storage device.

  The transmission unit 21, the reception unit 23, the transmission power setting unit 31, and the reception power detection unit 33 may be well-known ones, and description thereof is omitted here.

  With reference to FIG. 2, an ad hoc wireless communication network used in the transmission power setting method of the first embodiment will be described. An ad hoc wireless communication network is a wireless communication network in which terminal devices communicate directly with each other without using a specific access point. FIG. 2 is a schematic diagram for explaining a configuration of an ad hoc wireless communication network (hereinafter also simply referred to as a wireless communication network) 5, and is a diagram mainly showing the first terminal device 10 a as an example. It is. The wireless communication network 5 can be configured to include a number of terminal devices according to the setting. Here, in addition to the first terminal device 10a, the second to fifth terminal devices 10b, 10c, 10d, and The description will be made assuming that the device 10e is configured. Further, each of the first to fifth terminal devices 10a to 10e has the same configuration as the terminal device 10 described with reference to FIG.

  As described above, the first terminal apparatus (hereinafter also referred to as a transmission source terminal) 10a can transmit a transmission signal with different transmission powers from the minimum power to the maximum power. In the following description, it is assumed that the transmission source terminal 10a transmits a signal with three levels of transmission power: minimum power, maximum power, and intermediate power. Note that, depending on the setting, signal transmission may be performed with transmission power of four or more stages, or signal transmission may be performed with transmission power of two stages of minimum power and maximum power.

  Here, a range in which communication is possible when the source terminal 10a transmits a signal with the minimum power is referred to as a minimum transmission range 91, and a range in which communication is possible when the signal is transmitted with intermediate power is an intermediate transmission. The range 93 is referred to, and a range in which communication is possible when signals are transmitted with the maximum power is referred to as a maximum transmission range 95. The second terminal apparatus 10b is located within the area of the minimum transmission range 91, and the third terminal apparatus 10c is located within the area of the intermediate transmission range 93 and outside the area of the minimum transmission range 91. In addition, it is assumed that the fourth terminal device 10 d is located within the maximum transmission range 95 and outside the intermediate transmission range 93. The fifth terminal device 10e is a terminal device that constitutes the wireless communication network 5, but is located outside the area of the maximum transmission range 95 of the transmission source terminal 10a. Therefore, in this example, the transmission source terminal 10a and the fifth terminal device 10e cannot communicate directly. In the following description, the second to fifth terminal devices 10b to 10e may be referred to as transmission destination terminals.

  With reference to FIG. 3, the operation of the transmission power setting method of the first embodiment will be described. FIG. 3 is a diagram showing a processing flow for explaining the transmission power setting method of the first embodiment in the transmission source terminal.

  The transmission power setting at the transmission source terminal 10a is performed by the control unit 61 of the terminal device 10 described with reference to FIG. 1 by reading a program from the ROM 55 at a predetermined time interval based on the network operation policy. It is done by executing. In the ROM 55, as already described, the minimum transmission level, the maximum transmission level, the program necessary for performing the transmission power setting, and the minimum power, the maximum power, and the intermediate power that are the transmission power of the transmission signal, In addition, the intermediate transmission level is registered, and the identification information of all terminals constituting the network is registered. Further, in the ROM 55, connection request data for requesting connection to the transmission destination terminal and response data when there is a connection request are registered.

  In S10 (S is a symbol indicating a processing step; hereinafter the same), the transmission source terminal 10a performs initial setting according to a command from the input means. The RAM 53 is initialized, and identification information for identifying another terminal device (transmission destination terminal) constituting the wireless communication network, which is registered in the ROM 55, is read from the ROM 55 and registered in the transmission level table of the RAM 53. At this time, the transmission level for each destination terminal is not registered in this transmission table.

  In S20, the transmission source terminal 10a sets the transmission power to the minimum power in response to the instruction for specifying the minimum power from the input means, and transmits the connection request signal with the minimum power. The transmission power is set as follows, for example. First, the transmission / reception level control unit 65 reads the minimum signal level from the ROM 55 in response to an instruction from the input means, and corresponds to the minimum signal level so that the transmission power of the signal from the transmission unit 21 is set to the minimum. The transmitted transmission power setting signal is sent to the transmission power setting unit 31. Next, the transmission power setting unit 31 sets the signal to be transmitted to the transmission unit 21 with the minimum power in response to the transmission power setting signal. On the other hand, in response to this transmission power setting signal, the transmission / reception data control unit 63 of the transmission source terminal 10a reads out all the identification information and connection request data registered in the table of the RAM 53, and combines them. As a result, a connection request signal including identification information of the transmission destination is generated. The connection request signal is transmitted from the transmission / reception antenna 41 to all terminal devices constituting the wireless communication network 5 with the minimum power set through the transmission unit 21. Thus, the connection request signal is a signal including identification information of the transmission source terminal 10a and the transmission destination terminal. When the wireless communication network is a wireless LAN (Local Area Network), transmission / reception of signals between terminal devices is performed in units of frames (data handling the data link layer of layer 2). The identification information of the terminal device and the destination terminal device is included as a MAC (Media Access Control) address. Note that whether to include identification information of all transmission destination terminals in one connection request signal or to include identification information of one transmission destination terminal is merely a design problem.

  In S30, the transmission source terminal 10a receives a response signal from the transmission destination terminal that has received the connection request signal. This process is performed as follows.

  In response to the connection request signal, the transmission destination terminal that has received the connection request signal transmits a response signal including identification information of the transmission destination terminal to the transmission source terminal 10a. The configuration of the transmission destination terminal is the same as that of the transmission source terminal. The transmission / reception data control unit 63 of the transmission destination terminal receives the connection request signal from the transmission source terminal via the transmission / reception antenna 41 and the reception unit 23. The transmission / reception data control unit 63 of the transmission destination terminal generates a response signal. The generation of the response signal is performed by extracting the identification information of the transmission source terminal from the connection request signal, reading the response data from the ROM 55, and combining the two. The transmission / reception data control unit 63 transmits a response signal including the identification information of the transmission destination terminal with the maximum power to the terminal device specified by the identification signal, that is, the transmission source terminal. The transmission source terminal 10a waits for a certain time after transmitting the connection request signal, and determines whether or not the response signal has been received based on whether or not the response signal has been received during that time.

  In S40, the transmission / reception data control unit 63 of the transmission source terminal 10a extracts identification information from the received response signal.

  In S50, the transmission / reception data control unit 63 of the transmission source terminal 10a collates the extracted identification information with the identification information registered in the transmission level table in advance. If there is matching identification information as a result of the collation, the identification information and the transmission power of the connection request signal are associated with each other and registered in the transmission level table of the memory. When the transmission power is the minimum power, the minimum transmission level set to the minimum power is registered as the transmission level.

  After registering the minimum transmission level, in S60, the transmission source terminal 10a retransmits the connection request signal. Here, in response to the registration of the minimum transmission level, the transmission source terminal 10a sets the transmission power to the intermediate power and transmits the connection request signal with the intermediate power. In this case, the minimum transmission level may be replaced with an intermediate level, and the same process as in the case of connection request signal transmission with minimum power may be performed.

  After transmitting the connection request signal with the intermediate power, the processes of S30 and S40 are performed. Thereafter, in S50, the transmission / reception data control unit 63 of the transmission source terminal 10a collates the extracted identification information with the identification information registered in the transmission level table in advance. If there is matching identification information as a result of the collation, the identification information and the transmission power of the connection request signal are associated with each other and registered in the transmission level table of the memory. When the transmission power is intermediate power, it is determined whether the minimum transmission level is registered or unregistered among the matching identification information. As a result of the discrimination, the intermediate transmission level set to the intermediate power is registered as the transmission level only for unregistered identification information, while the minimum transmission level is stored as it is for the registered identification information.

  After registering the intermediate transmission level, in S60, the transmission source terminal 10a retransmits the connection request signal. Here, in response to the registration of the intermediate transmission level, the transmission source terminal 10a sets the transmission power to the maximum power and transmits the connection request signal with the maximum power. In this case, the minimum transmission level may be replaced with the maximum level in the same manner as the connection request signal transmission with the minimum power.

  After transmitting the connection request signal with the maximum power, the processes of S30 and S40 are performed. Thereafter, in S50, the transmission / reception data control unit 63 of the transmission source terminal 10a collates the extracted identification information with the identification information registered in the transmission level table in advance. If there is matching identification information as a result of the collation, the identification information and the transmission power of the connection request signal are associated with each other and registered in the transmission level table of the memory. When the transmission power is the maximum power, it is determined whether the minimum transmission level and the intermediate transmission level are registered or not registered among the matching identification information. As a result of the determination, the maximum transmission level set to the maximum power is registered as the transmission level only for unregistered identification information, while the minimum transmission level or the intermediate transmission level is registered for registered identification information. Save as is.

  After the registration of the maximum transmission level, the transmission source terminal 10a ends the transmission power setting.

  An example of operation of the transmission power setting method of the first embodiment will be described with reference to FIGS. FIG. 4 is a diagram illustrating a processing sequence for explaining the transmission power setting method according to the first embodiment. FIG. 5A to FIG. 5D are diagrams illustrating a transmission level determination process for explaining the transmission power setting method according to the first embodiment. Here, the identification information for each of the terminals 10a to 10e is a MAC address. The identification information for the first terminal device 10a is assumed to be 00: 00: 00: 00: 00: 01 (hereinafter also referred to as (01) for simplicity), and the identification information for the second terminal device 10b is 00. : 00: 00: 00: 00: 02 (hereinafter sometimes referred to as (02) for simplicity), and identification information for the third terminal device 10c is set to 00: 00: 00: 00: 00 ( Hereinafter, the identification information for the fourth terminal apparatus 10d is represented as 00: 00: 00: 00: 04 (hereinafter, represented by (04) for simplicity). And the identification information for the fifth terminal device 10d is 00: 00: 00: 00: 00 (hereinafter may be represented by (05) for simplicity). Further, the minimum transmission level, the intermediate transmission level, and the maximum transmission level are set to “1”, “2”, and “3”, respectively, and “−” indicates that the transmission level is not set.

  After the initial setting in S10, the transmission power is set to the minimum power in S20, and the transmission source terminal 10a transmits the connection request signal M11 to all the transmission destination terminals constituting the wireless communication network 5. The transmission level table of the memory at this time is in a state where there is no transmission level setting for each identification information (see FIG. 5A). Here, the connection request signal is represented by the symbol M11, and the connection request signals for the second to fifth terminal devices 10b to 10e, which are transmission destination terminals, are represented by M11-1 to M11-4. In the following, signals are distinguished by assigning the same branch number to each destination terminal.

  In this example, the transmission destination terminal located within the area of the minimum transmission range 91 is only the second terminal device 10b. The second terminal apparatus 10b receives the connection request signal M11-1 transmitted with the minimum power. Since the third to fifth terminal devices 10c to 10e are located outside the region of the minimum transmission range 91, the connection request signals M11-2 to M11-2 to 4 are not received. In response to receiving the connection request signal M11-1, the transmission / reception data control unit 63 of the second terminal device 10b generates a response signal M21-1, and sends this response signal M21-1 to the transmission source terminal 10a. Transmit at maximum power.

  In S30, the transmission source terminal 10a receives the response signal M21-1 from the second terminal apparatus 10b.

  In S40, the transmission source terminal 10a registers transmission power with respect to the second terminal apparatus 10b. Since the connection request signal M11 is transmitted with the minimum power, when the response signal M21-1 is received, the identification information that matches the identification information (02) extracted from the response signal M21-1, that is, the second The minimum transmission level “1” is registered in the transmission level table for the identification information (02) specifying the terminal device 10b. The result is shown in FIG.

  After registering the minimum transmission level, the transmission source terminal 10a generates a connection request signal M13 (M13-1, M13-2, M13-3, and M13-4), and sequentially transmits the connection request signal M13 with intermediate power. To do.

  The transmission destination terminal that has received the connection request signal M13 transmits a response signal M23 to the transmission source terminal 10a in response to the connection request signal M13. In this example, the transmission destination terminals located in the area of the intermediate transmission range 93 are the second and third terminal devices 10b and 10c. In response to the reception of the connection request signal M13-1, the second terminal device 10b generates a response signal M23-1 and transmits this response signal M23-1 to the transmission source terminal 10a with the maximum power. Further, in response to the reception of the connection request signal M13-2, the third terminal apparatus 10c generates a response signal M23-2 and transmits this response signal M23-2 to the transmission source terminal 10a with the maximum power. To do. Since the fourth and fifth terminal devices 10d and 10e are located outside the intermediate transmission range 93, they do not receive the connection request signals M13-3 and M13-4.

  In S30, the transmission source terminal 10a receives the response signal M23-1 from the second terminal apparatus 10b and the response signal M23-2 from the third terminal apparatus 10c.

  In S40, the transmission source terminal 10a sets transmission levels for the second terminal device 10b and the third terminal device 10c. Since the connection request signal M13 is transmitted with intermediate power, when the response signals M23-1 and M23-2 are received, the identification information (02) and (03 extracted from the response signals M23-1 and M23-2 are received. ), The intermediate transmission level “2” is registered in the transmission level table for the identification information (03) whose minimum transmission level is unregistered. Here, since the minimum transmission level “1” has already been registered for the second terminal device 10b whose identification information corresponds to (02), no new registration is performed. On the other hand, since the minimum transmission level is not registered for the third terminal device 10c, the intermediate transmission level “2” is set in the transmission level table for the identification information (03) for specifying the third terminal device 10c. sign up. The result is shown in FIG.

  After registering the intermediate transmission level, the transmission source terminal 10a generates a connection request signal M15 (M15-1, M15-2, M15-3, and M15-4), and sequentially transmits the connection request signal M15 with the maximum power. To do.

  In response to the connection request signal M15, the transmission destination terminal that has received the connection request signal M15 transmits a response signal M25 to the transmission source terminal 10a. In this example, the transmission destination terminals located in the region of the maximum transmission range 95 are the second to fourth terminal devices 10b to 10d. In response to receiving the connection request signal M15-1, the second terminal device 10b generates a response signal M25-1, and transmits the response signal M25-1 to the transmission source terminal 10a with the maximum power. Further, in response to the reception of the connection request signal M15-2, the third terminal apparatus 10c generates a response signal M25-2 and transmits this response signal M25-2 to the transmission source terminal 10a with the maximum power. To do. Further, the fourth terminal apparatus 10d generates a response signal M25-3 in response to the reception of the connection request signal M15-3, and transmits the response signal M25-3 to the transmission source terminal 10a with the maximum power. To do. Note that the fifth terminal apparatus 10e is located outside the maximum transmission range 95, and therefore does not receive the connection request signal M15-4.

  In S30, the transmission source terminal 10a receives the response signal M25-1 from the second terminal apparatus 10b, the response signal M25-2 from the third terminal apparatus 10c, and the response signal M25- from the fourth terminal apparatus 10d. 3 is received.

  In S40, the transmission source terminal 10a sets the transmission level for the second terminal device 10b, the third terminal device 10c, and the fourth terminal device 10d. Since connection request signal M15 is transmitted at the maximum power, when response signals M25-1, M25-2 and M25-3 are received, they are extracted from response signals M25-1, M25-2 and M25-3. Among the identification information that matches the identification information (02), (03), and (04), the maximum transmission level “3” with respect to the identification information whose minimum transmission level “1” and intermediate transmission level “2” are not registered. Is registered in the transmission level table. Here, since the minimum transmission level “1” has already been registered for the second terminal apparatus 10b and the intermediate transmission level “2” has already been registered for the third terminal apparatus 10c, No new registration is performed. On the other hand, since the minimum transmission level or the intermediate transmission level is not registered for the fourth terminal apparatus 10d, the maximum transmission level “3” is registered in the transmission level table for the fourth terminal apparatus 10d. The result is shown in FIG. After registering the maximum transmission level, the transmission level setting is completed. The transmission level corresponding to the fifth terminal device 10e remains unregistered.

  According to the transmission power setting method of the first embodiment, since the transmission power is sequentially increased from the minimum power to the maximum power, the optimum transmission level can be set. Low power consumption can be realized. When the connection request signal is transmitted with the minimum power or the intermediate power, if the response signal is received from all other terminal devices constituting the wireless communication network, the connection request signal is transmitted with the maximum power. Alternatively, the transmission power setting process may be terminated.

  Here, the case where the first terminal apparatus 10a is a transmission source terminal and the second to fifth terminal apparatuses 10b to 10e, which are transmission destination terminals, transmit at the maximum power has been described. Also in the terminal devices 10b to 10e, if the same transmission power setting as that of the transmission source terminal is sequentially performed, the appropriate transmission level is set in each terminal device.

  Further, if the above transmission power setting is performed at a time interval determined according to the operation policy of the ad hoc wireless communication network, even if necessary transmission power changes, such as the distance between terminal devices changes, the transmission source terminal In this case, a suitable transmission level is maintained.

  Thus, since the optimization of transmission power is measured in each terminal device for ad hoc wireless communication networks, radio wave interference is reduced, and communication can be performed between terminal devices that are not involved in communication.

(Second Embodiment)
With reference to FIG. 6, the transmission power setting method of 2nd Embodiment is demonstrated. FIG. 6 is a diagram illustrating a processing flow for explaining the transmission power setting method according to the second embodiment in the transmission source terminal. In the transmission power setting method of the first embodiment, the transmission source terminal 10a has been described with respect to the example in which the connection request signal is transmitted in the order of minimum power, intermediate power, and maximum power. On the other hand, the second embodiment differs in that the transmission source terminal 10a transmits the connection request signal in the order of maximum power, intermediate power, and minimum power, that is, in the reverse order to the first embodiment. Since the configurations of the terminal device 10 and the wireless communication network 5 are the same as those in the first embodiment, the description thereof is omitted here.

  In S15, the transmission source terminal 10a performs initial setting according to a command from the input means. As in the case of the first embodiment, the RAM 53 is initialized and the identification information registered in the ROM 55 and specifying other terminal devices (transmission destination terminals) constituting the wireless communication network is stored in the transmission level table of the RAM 53. be registered. At this time, the transmission level for each destination terminal is not registered in the transmission level table.

  In S25, the transmission source terminal 10a sets the transmission power to the maximum power in response to the instruction for specifying the minimum power from the input means, and transmits a connection request signal. The setting of the transmission power is the same as that described in the first embodiment, and a description thereof will be omitted.

  In S35, the transmission source terminal 10a receives a response signal from the transmission destination terminal that has received the connection request signal.

  In S45, the transmission / reception data control unit 63 of the transmission source terminal 10a extracts identification information from the received response signal.

  In S55, the transmission / reception data control unit 63 of the transmission source terminal 10a collates the extracted identification information with the identification information registered in the transmission level table in advance. If there is matching identification information as a result of the collation, the identification information and the transmission power of the connection request signal are associated with each other and registered in the transmission level table of the memory. In the second embodiment, the transmission power when the connection request signal is transmitted is set regardless of the transmission power. Here, since the transmission power is the maximum power, the maximum transmission level set to the maximum power is registered as the transmission level.

  After registering the maximum transmission level, in S65, the transmission source terminal 10a retransmits the connection request signal. Here, in response to the registration of the maximum transmission level, the transmission source terminal 10a sets the transmission power to the intermediate power and transmits the connection request signal with the intermediate power. In this case, the maximum transmission level may be replaced with the intermediate transmission level, and the connection request signal may be transmitted with the maximum power.

  After transmitting the connection request signal with the intermediate power, the processes of S35 and S45 are performed. Thereafter, in S55, the transmission / reception data control unit 63 of the transmission source terminal 10a collates the extracted identification information with the identification information registered in the transmission level table in advance. If there is matching identification information as a result of the collation, the identification information and the transmission power of the connection request signal are associated with each other and registered in the transmission level table of the memory. Since the transmission power is intermediate power, the intermediate transmission level set to the intermediate power is registered as the transmission level.

  After registering the intermediate transmission level, the transmission source terminal 10a retransmits the connection request signal in S65. Here, in response to the registration of the intermediate transmission level, the transmission source terminal 10a sets the transmission power to the minimum power and transmits the connection request signal with the minimum power. In this case, the maximum transmission level may be replaced with the intermediate transmission level, and the connection request signal may be transmitted at the maximum power.

  After transmitting the connection request signal with the minimum power, the processes of S35 and S45 are performed. Thereafter, in S55, the transmission / reception data control unit 63 of the transmission source terminal 10a collates the extracted identification information with the identification information registered in the transmission level table in advance. If there is matching identification information as a result of the collation, the identification information and the transmission power of the connection request signal are associated with each other and registered in the transmission level table of the memory. Since the transmission power is the minimum power, the minimum transmission level set to the minimum power is registered as the transmission level.

  After registering the minimum transmission level, the transmission source terminal 10a ends the transmission power setting.

  An example of the transmission power setting method of the second embodiment will be described with reference to FIG. 6, FIG. 7, and FIG. FIG. 7 is a diagram illustrating a processing sequence for explaining the transmission power setting method according to the second embodiment. FIGS. 8A to 8D are diagrams illustrating a transmission level determination process for explaining the transmission power setting method according to the second embodiment. Here, the identification information for each of the terminals 10a to 10e is the same as that described in the first embodiment. In addition, the minimum transmission level, the intermediate transmission level, and the maximum transmission level are “1”, “2”, and “3”, respectively, and a state where no transmission level is set is indicated by “−”.

  After the initial setting in S15, the transmission power is set to the maximum power in S25, and the transmission source terminal 10a transmits a connection request signal M15 to all the transmission destination terminals constituting the wireless communication network 5. The transmission level table of the memory at this time is in a state where there is no transmission level setting for each identification information (see FIG. 8A).

  In this example, the transmission destination terminals located in the region of the maximum transmission range 95 are the second to fourth terminal devices 10b to 10d. In response to receiving the connection request signal M15-1, the second terminal device 10b generates a response signal M25-1, and transmits the response signal M25-1 to the transmission source terminal 10a with the maximum power. Further, in response to the reception of the connection request signal M15-2, the third terminal apparatus 10c generates a response signal M25-2 and transmits this response signal M25-2 to the transmission source terminal 10a with the maximum power. To do. Further, the fourth terminal apparatus 10d generates a response signal M25-3 in response to the reception of the connection request signal M15-3, and transmits the response signal M25-3 to the transmission source terminal 10a with the maximum power. To do. Note that the fifth terminal apparatus 10e is located outside the maximum transmission range 95, and therefore does not receive the connection request signal M15-4.

  In S35, the transmission source terminal 10a receives the response signal M25-1 from the second terminal apparatus 10b, the response signal M25-2 from the third terminal apparatus 10c, and the response signal M25- from the fourth terminal apparatus 10d. 3 is received.

  In S45, the transmission source terminal 10a sets transmission power for the second terminal apparatus 10b, the third terminal apparatus 10c, and the fourth terminal apparatus 10d. Since connection request signal M15 is transmitted at the maximum power, when response signals M25-1, M25-2 and M25-3 are received, they are extracted from response signals M25-1, M25-2 and M25-3. The maximum transmission level “3” is registered in the transmission level table for the identification information that matches the identification information (02), (03), and (04). Here, the maximum transmission level is registered in the transmission level table for the second terminal device 10b, the third terminal device 10c, and the fourth terminal device 10d. The result is shown in FIG.

  After registering the maximum transmission level, the transmission source terminal 10a generates a connection request signal M13 (M13-1, M13-2, M13-3, and M13-4), and sequentially transmits the connection request signal M13 with intermediate power. To do.

  The transmission destination terminal that has received the connection request signal M13 transmits a response signal M23 to the transmission source terminal 10a in response to the connection request signal M13. In this example, the transmission destination terminals located in the area of the intermediate transmission range 93 are the second and third terminal devices 10b and 10c. In response to the reception of the connection request signal M13-1, the second terminal device 10b generates a response signal M23-1 and transmits this response signal M23-1 to the transmission source terminal 10a with the maximum power. Further, in response to the reception of the connection request signal M13-2, the third terminal apparatus 10c generates a response signal M23-2 and transmits this response signal M23-2 to the transmission source terminal 10a with the maximum power. To do. Since the fourth and fifth terminal devices 10d and 10e are located outside the intermediate transmission range 93, they do not receive the connection request signals M13-3 and M13-4.

  In S35, the transmission source terminal 10a receives the response signal M23-1 from the second terminal device 10b and the response signal M23-2 from the third terminal device 10c.

  In S45, the transmission source terminal 10a sets transmission levels for the second terminal device 10b and the third terminal device 10c. Since the connection request signal M13 is transmitted with intermediate power, when the response signals M23-1 and M23-2 are received, the identification information (02) and (03 extracted from the response signals M23-1 and M23-2 are received. The intermediate transmission level “2” is registered in the transmission level table for the identification information that coincides with (). The result is shown in FIG.

  After registering the intermediate transmission level, the transmission source terminal 10a generates a connection request signal M11 (M11-1, M11-2, M11-3, and M11-4), and sequentially transmits the connection request signal M11 with the minimum power. To do.

  In response to the connection request signal M11, the transmission destination terminal that has received the connection request signal M11 transmits a response signal M21 to the transmission source terminal 10a. In this example, the transmission destination terminal located within the area of the minimum transmission range 91 is only the second terminal device 10b. The second terminal apparatus 10b receives the connection request signal M11-1 transmitted with the minimum power. Since the third to fifth terminal devices 10c to 10e are located outside the region of the minimum transmission range 91, the connection request signals M11-2 to M11-2 to 4 are not received. In response to receiving the connection request signal M11-1, the transmission / reception data control unit 63 of the second terminal device 10b generates a response signal M21-1, and sends this response signal M21-1 to the transmission source terminal 10a. Transmit at maximum power.

  In S35, the transmission source terminal 10a receives the response signal M21-1 from the second terminal device 10b.

  In S45, the transmission source terminal 10a registers transmission power with respect to the second terminal apparatus 10b. Since the connection request signal M11 is transmitted with the minimum power, when the response signal M21-1 is received, the identification information that matches the identification information (02) extracted from the response signal M21-1, that is, the second The minimum transmission level “1” is registered in the transmission level table for the identification information (02) specifying the terminal device 10b. The result is shown in FIG. After registering the minimum transmission level, the transmission power setting is terminated. The transmission level corresponding to the fifth terminal device 10e remains unregistered.

  According to the transmission power setting method of the second embodiment, since the transmission power is sequentially reduced from the maximum power to the minimum power, the optimal transmission level is set as in the first embodiment. In addition to being able to register transmission power for all transmission destination terminals that have transmitted response signals, in addition to setting optimal transmission power, there is an additional effect that the process of setting transmission power is simplified. .

  In the first embodiment and the second embodiment, the case where the first terminal apparatus 10a is a transmission source terminal and the second to fifth terminal apparatuses 10b to 10e, which are transmission destination terminals, transmit at the maximum power will be described. However, in the second to fifth terminal devices 10b to 10e, if the same transmission power setting as that of the transmission source terminal is sequentially performed, each terminal device is set to an appropriate transmission level.

  In addition, by performing the above transmission power setting at a time interval determined according to the operation policy of the ad hoc wireless communication network, even if necessary transmission power changes, such as the distance between wireless terminal devices changes, transmission A suitable transmission level is maintained in the original terminal.

  Thus, since the optimization of transmission power is measured in each terminal device for ad hoc wireless communication networks, radio wave interference is reduced, and communication can be performed between terminal devices that are not involved in communication.

  In the first embodiment described above, a case where a connection request signal is transmitted with transmission power in the order of minimum power, intermediate power, and maximum power will be described. In the second embodiment, maximum power, intermediate power, and Although the case where the connection request signal power is reduced by the transmission power in the order of the minimum power has been described, the order of the minimum power, the intermediate power, and the maximum power is not limited to the above example. However, when the transmission power is set in a different order, it is necessary to compare the set transmission level with the transmission power of the connection request signal when associating the transmission signal of the connection request signal with the identification information. is there.

(Third embodiment)
With reference to FIG.9 and FIG.10, the transmission power setting method of 3rd Embodiment is demonstrated. FIG. 9 is a diagram illustrating a processing flow for explaining the transmission power setting method of the third embodiment in the transmission source terminal. FIG. 10 is a diagram illustrating a processing sequence for explaining the transmission power setting method according to the third embodiment. Since the configurations of the terminal device 10 and the wireless communication network 5 are the same as those in the first embodiment, the description thereof is omitted here.

  In S110, the transmission / reception data control unit 63 of the transmission source terminal 10a generates a connection request signal M17 and transmits the connection request signal M17 with the maximum power. In response to the connection request signal M17, the transmission destination terminal that has received the connection request signal M17 transmits a response signal M27 to the transmission source terminal 10a. Here, the second terminal device 10b will be described as an example of the transmission destination terminal.

  The transmission / reception data control unit 63 of the second terminal device 10b receives the connection request signal M17. The reception power of the connection request signal M17 at the reception unit 23 of the second terminal apparatus 10b is detected by the reception power detection unit 33 and sent to the transmission / reception level control unit 65 as a reception power detection signal. The transmission / reception data control unit 63 of the second terminal device 10b generates a response signal M27 in response to receiving the connection request signal M17. At this time, the transmission / reception data control unit 63 receives, from the transmission / reception level control unit 65, information on the magnitude of the reception power of the connection request signal M17 as a reception level, and a response signal M27 including the reception level of the connection request signal M17 as information. Generate. The transmission destination terminal 10b transmits a response signal M27 to the transmission source terminal 10a.

  In S120, the transmission source terminal 10a receives the response signal M27 from the transmission destination terminal 10b. The reception power of the response signal M27 at the reception unit 23 of the transmission source terminal 10a is detected by the reception power detection unit 33, and is transmitted to the transmission / reception level control unit 65 of the transmission source terminal 10a as a reception power detection signal.

  In S130, the transmission / reception data control unit 63 of the transmission source terminal 10a determines the identification information for identifying the transmission destination terminal 10b from the response signal M27 and the reception power of the connection request signal M17 at the transmission destination terminal. Extract information. By calculating the difference between the maximum power and the received power that are the transmission levels when the connection request signal M17 is transmitted, the power attenuation amount for the signal transmitted from the transmission source terminal 10a to the transmission destination terminal 10b is calculated. If the transmission power is set to a magnitude equal to the power attenuation, the reception terminal 10b has a reception power that is approximately the same as the magnitude of the surrounding noise, and may not be received normally.

  Therefore, if the difference between the maximum power and the received power, that is, the amount of power attenuation plus a margin is set as the transmission level, the transmission level can be brought into an appropriate state. The size of the margin can be set based on a network operation policy or a communication environment such as an S / N ratio. The margin setting may be instructed from the input means.

  Since the transmission level can be calculated from the maximum power and the reception power at the transmission destination terminal included in the response signal from each transmission destination terminal. By transmitting the connection request signal, the transmission level can be set for all the terminal devices included in the wireless communication network.

  Since the transmission level is set to the difference between the output power and the reception power plus a margin, it can be set to an appropriate level.

(Fourth embodiment)
With reference to FIG.11 and FIG.12, the transmission power setting method of 4th Embodiment is demonstrated. FIG. 11 is a diagram illustrating a processing flow for explaining the transmission power setting method of the fourth embodiment in the transmission source terminal. FIG. 12 is a diagram illustrating a processing sequence for explaining the transmission power setting method according to the fourth embodiment. Since the configurations of the terminal device 10 and the wireless communication network 5 are the same as those in the first embodiment, the description thereof is omitted here. Since S110 to S130 are the same as those in the third embodiment, the description thereof is omitted here.

  In the fourth embodiment, subsequent to S130, in S140, the transmission source terminal 10a transmits a confirmation signal M31 to the transmission destination terminal 10b. The confirmation signal M31 is generated by the transmission / reception data control unit 63 of the transmission source terminal 10a in response to the reception of the response signal M27. When the confirmation signal M31 is generated, the transmission / reception data control unit 63 receives information on the reception power of the response signal M27 from the transmission / reception level control unit 65, and includes the reception power of the response signal M27 as information in the confirmation signal M31.

  The second terminal device 10b, which is the transmission destination terminal that has received the confirmation signal M31, transmits power when the response signal M27 is transmitted, and reception power of the response signal M27 at the transmission source terminal 10a included in the confirmation signal M31. From this, the transmission level to the transmission source terminal 10a is calculated. This calculation is performed in the same manner as the transmission level calculation at the transmission source terminal described in the third embodiment. Here, since the difference between the transmission power of the response signal M27 and the reception power of the response signal M27 corresponds to the amount of signal attenuation between the terminals, a difference between the transmission power and the reception power plus a margin is newly added. If the transmission level is set, the transmission level can be set to an appropriate state. The size of the margin can be set based on the network operation policy as in the third embodiment. The second terminal device 10b, which is the transmission destination terminal, sets the transmission level as described above, and transmits the test signal M41 to the transmission source terminal at the transmission level. The test signal M41 is generated by the transmission / reception data control unit 63 of the second terminal apparatus 10b. When the test signal M41 is generated, the transmission / reception data control unit 63 receives the reception power information of the confirmation signal M31 from the transmission / reception level control unit 65 of the second terminal apparatus 10b, and the test signal M41 includes the reception power information. Make it.

  In the test signal reception process of S150, the transmission source terminal 10a receives the test signal M41 including the confirmation signal reception power from the second terminal apparatus 10b that has received the confirmation signal M31. By receiving the test signal M41, the transmission source terminal 10a can confirm that the confirmation signal M31 transmitted at the set transmission level has reached the second terminal device 10b. The transmission / reception data control unit 63 of the transmission source terminal 10a extracts the confirmation signal reception power from the test signal M41. After that, the confirmation signal reception power is compared with the transmission power of the confirmation signal M31. If the confirmation signal reception level is equal to the margin given when transmitting the confirmation signal M31, it is determined that the set transmission level is appropriate. If the margin and the set transmission level are significantly different, the transmission level can be adjusted by performing the processes from S110 to S150 again.

  In the test confirmation signal transmission process of S160, the transmission source terminal 10a transmits a confirmation signal M33 to the transmission destination terminal 10b. The confirmation signal M33 includes the received power of the test signal M41 as information. By receiving the confirmation signal M33, the transmission destination terminal 10b can confirm that the test signal M41 transmitted at the set transmission level has reached the transmission source terminal 10a. Further, if the received power of the test signal M41 is equal to the margin given when the test signal M31 is transmitted, it is determined that the set transmission level is appropriate.

  When the set transmission level and the margin are remarkably different, the transmission level can be adjusted by performing the processes from S110 to S160 using the second wireless terminal apparatus 10b as the transmission source terminal.

  When the transmission source terminal 10a has an output unit such as a display, information such as a transmission level setting status used when performing the processing described in the above-described embodiments can be displayed on the display.

  The transmission power setting may be performed by the user of the transmission source terminal inputting the transmission level from the input means. Furthermore, the ROM 55 may be provided with a program for performing the processing described in each embodiment, and the user may designate any of the processing by using the input unit.

It is the schematic for demonstrating the function structure of the terminal device in an ad hoc radio | wireless communication network. It is the schematic for demonstrating the structure of an ad hoc radio | wireless communication network. It is a figure which shows the processing flow of the transmission power setting method of 1st Embodiment in a transmission source terminal. It is a figure which shows the process sequence of the transmission power setting method of 1st Embodiment. It is a figure which shows the determination process of the transmission level of 1st Embodiment. It is a figure which shows the processing flow of the transmission power setting method of 2nd Embodiment in a transmission source terminal. It is a figure which shows the process sequence of the transmission power setting method of 2nd Embodiment. It is a figure which shows the determination process of the transmission level of 2nd Embodiment. It is a figure which shows the processing flow of the transmission power setting method of 3rd Embodiment in a transmission source terminal. It is a figure which shows the process sequence of the transmission power setting method of 3rd Embodiment. It is a figure which shows the processing flow of the transmission power setting method of 4th Embodiment in a transmission source terminal. It is a figure which shows the process sequence of the transmission power setting method of 4th Embodiment.

Explanation of symbols

5 ad hoc wireless communication network 10 terminal device 10a terminal device (source terminal)
10b, 10c, 10d, 10e Terminal device (destination terminal)
21 Transmission Unit 23 Reception Unit 31 Transmission Power Setting Unit 33 Reception Power Detection Unit 41 Transmission / Reception Antenna 50 MPU
51 CPU
53 RAM
55 ROM
61 Control means 63 Transmission / reception data control unit 65 Transmission / reception level control unit 91 Minimum transmission range 93 Intermediate transmission range 95 Maximum transmission range

Claims (7)

When one of a plurality of terminal devices constituting an ad hoc wireless communication network is a transmission source terminal and the remaining terminal devices are transmission destination terminals,
In setting the transmission power of the transmission signal for each of the transmission destination terminals from the transmission source terminal, in the transmission source terminal,
(A) In the memory of the transmission source terminal, identification information for individually specifying all the transmission destination terminals is registered in advance, and transmission power is set to minimum power, maximum power, and minimum and maximum intermediate power, respectively. Register the minimum transmission level, maximum transmission level and intermediate transmission level as the transmission level to be set,
(B) A connection request signal is transmitted from the transmission source terminal in the order of the transmission power of the minimum power, intermediate power, and maximum power, respectively.
(C) receiving a response signal including identification information from the destination terminal that has received the connection request signal, and extracting the identification information from the response signal;
(D) If there is matching identification information obtained by comparing the extracted identification information with previously registered identification information, the transmission power of the connection request signal and the matching identification information are associated with each other and transmitted. (E) The correspondence with the identification information that matches the transmission power is registered in the memory of the former terminal,
(E-1) When the transmission power is the minimum power, the minimum transmission level set to the minimum power is registered,
(E-2) When the transmission power is intermediate power, among the matching identification information, register the intermediate transmission level set to the intermediate power only for identification information whose minimum transmission level is unregistered, and (E-3) When the transmission power is the maximum power, the maximum transmission that is set to the maximum power only for the identification information in which the minimum transmission level and the intermediate transmission level are unregistered among the matching identification information A transmission power setting method in an ad hoc wireless communication network terminal device, comprising: registering a level. When one of a plurality of terminal devices constituting an ad hoc wireless communication network is a transmission source terminal and the remaining terminal devices are transmission destination terminals,
In setting the transmission power of the transmission signal for each of the transmission destination terminals from the transmission source terminal, in the transmission source terminal,
(A) In the memory of the transmission source terminal, identification information for individually specifying all the transmission destination terminals is registered in advance, and transmission power is set to minimum power, maximum power, and minimum and maximum intermediate power, respectively. Register the minimum transmission level, maximum transmission level and intermediate transmission level as the transmission level to be set,
(B) A connection request signal is transmitted from the transmission source terminal in the order of the transmission power of the maximum power, intermediate power, and minimum power, respectively.
(C) receiving a response signal including identification information from the destination terminal that has received the connection request signal, and extracting the identification information from the response signal;
(D) When there is matching identification information by comparing the extracted identification information with previously registered identification information, the transmission power of the connection request signal is associated with the matching identification information and the transmission (E) The correspondence with the identification information that matches the transmission power is registered in the memory of the former terminal,
(E-1) When the transmission power is the minimum power, the minimum transmission level set to the minimum power is registered,
(E-2) When the transmission power is intermediate power, register the intermediate transmission level to be set to the intermediate power; and (e-3) When the transmission power is maximum power, set to the maximum power. A transmission power setting method in an ad hoc wireless communication network terminal device, comprising: registering a maximum transmission level. When one of a plurality of terminal devices constituting an ad hoc wireless communication network is a transmission source terminal and the remaining terminal devices are transmission destination terminals,
In setting the transmission power of the transmission signal for each of the transmission destination terminals from the transmission source terminal, in the transmission source terminal,
(A) The identification information for individually identifying all the transmission destination terminals is registered in advance in the memory of the transmission source terminal, and the maximum transmission level is registered as the transmission level for setting the transmission power to the maximum power. Aside,
(B) A connection request signal is transmitted from the transmission source terminal with maximum power;
(C) receiving a response signal including identification information and received power information at the transmission destination terminal of the connection request signal from the transmission destination terminal that has received the connection request signal; Extract received power,
(D) If there is matching identification information obtained by comparing the extracted identification information with previously registered identification information, the transmission level calculated using the transmission power and the reception power of the connection request signal, and A method for setting transmission power in an ad hoc wireless communication network terminal device, comprising: registering matching identification information in the memory of the transmission source terminal in association with each other. 4. The ad hoc wireless communication network terminal according to claim 3, wherein, when calculating the transmission level, a transmission level is obtained by adding a margin to the difference between the transmission power of the connection request signal and the reception power. A transmission power setting method in an apparatus. After calculating the transmission level,
(E) A confirmation signal including information on received power of the response signal at the transmission source terminal is transmitted to the transmission destination terminal specified by the extracted identification information;
(F) receiving a test signal including identification information and reception power information of the confirmation signal from the destination terminal that has received the confirmation signal, and receiving the identification information and the reception power of the confirmation signal from the test signal; Extract
(G) The ad hoc wireless communication network according to claim 3 or 4, wherein a confirmation signal including information on received power of the test signal is transmitted to a destination terminal specified by the extracted identification information. Transmission power setting method in a mobile terminal device. A terminal device used in an ad hoc wireless communication network including a transmission / reception antenna, a transmission / reception data control unit, a transmission / reception level control unit, a transmission unit, a transmission power setting unit, a reception unit, and a reception power detection unit,
In order to connect the transmission / reception data control unit and the transmission / reception antenna, the transmission unit and the reception unit are provided in parallel,
The transmission / reception level control unit is connected to the transmission unit via the transmission power setting unit, and the transmission power setting unit transmits data in the transmission unit in response to a transmission power setting signal from the transmission / reception level control unit. Set the power
The reception unit is connected to the transmission / reception level control unit via the reception power detection unit, and the reception power detection unit detects reception power at the reception unit and sends a reception power signal to the transmission / reception level control unit. A terminal device for an ad hoc wireless communication network, characterized by transmitting. An ad hoc wireless communication network comprising the ad hoc wireless communication network terminal device according to claim 6.

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