JP2011199908A - Wireless unit and wireless communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform wireless relay communication between mobile wireless units without a dedicated relay station.SOLUTION: A relay station search radio wave transmitting means 31 makes each mobile wireless unit (first and second mobile wireless units 40 and 41, and a third mobile wireless unit 42) to transmit relay station search radio waves according to a first sequence. A measuring means 32 makes each mobile wireless unit measure the field strength of the relay station search radio waves from each of the other mobile wireless units. A collecting means 33 collects information related to the field-strength measurement results from each mobile wireless unit as collected information. A determining means 34 determines the third wireless unit 42 that serves as a relay station for wireless communication between the first mobile wireless unit 40 and the second mobile wireless unit 41, based on the collected information. A relay operating means 35 makes the third mobile wireless unit 42 that has been determined to be the relay station operate as the relay station for wireless communication between the first mobile wireless unit 40 and the second mobile wireless unit 41.

Description

  The present invention relates to a wireless communication system such as a specific low power wireless device, a mobile wireless device, a wireless communication method and a program, and more specifically, a wireless communication system capable of performing wireless communication using a relay station, a mobile wireless device And a wireless communication method and program.

  In the wireless communication system of Patent Document 1, a relay station is installed at a predetermined point, and the relay station is a half-duplex communication system for wireless communication between two specific low-power radios that do not reach each other. By relaying, the wireless communication between both specific low-power radios is enabled. The specific low-power radio device is a radio device that complies with radio equipment for radio telephones stipulated by the Radio Law and related ordinances.

JP 2001-102983 A (FIG. 6 etc.)

  In the wireless communication system of Patent Document 1, a dedicated relay station is required. In addition, the number of relays is limited to one, and the area where two specific low-power wireless devices can perform wireless communication by relay is fixed and small.

  An object of the present invention is to provide a radio communication system and a mobile radio that enable radio communication by omitting a dedicated relay station when two mobile radio devices cannot receive radio waves from the other party. And providing a wireless communication method and program.

  Another object of the present invention is to provide a wireless communication system, a mobile wireless device, a wireless communication method, and a program that can perform wireless communication by flexibly changing a relay point to cope with a wide range of movements. That is.

The wireless communication system of the present invention includes a first mobile radio device and a first mobile wireless device, each of which is present at a point where it is impossible to receive radio waves from the other party. A mobile radio device separate from the radio device and having at least one third mobile radio device carried by a user different from the users of the first and second mobile radio devices; Yes. The wireless communication system has the following means.
Relay station search radio wave transmission means for causing each mobile radio to transmit a relay station search radio wave according to the first order;
Measuring means for causing each mobile radio to measure the electric field strength of relay station search radio waves from each other mobile radio,
Collection means for collecting information related to measurement results of electric field strength in each mobile radio as collection information,
Determining means for determining a third mobile radio as a relay station for radio communication between the first and second mobile radios based on the collected information; and a third mobile radio determined by the relay station Relay actuating means for actuating the machine as a relay station during radio communication between the first and second mobile radios.

The mobile radio of the present invention has the following means.
Relay station search radio wave transmission means for transmitting relay station search radio waves,
Measuring means for measuring electric field strength of relay station search radio waves from each other mobile radio,
Collection means for collecting measurement result information about the electric field strength in each mobile radio as collection information,
Determination means for determining a mobile radio for a relay station for wireless communication with a mobile radio for a communication partner based on the accumulated collected information, and the mobile station for the relay station to the determined mobile radio for the relay station Notification means for notifying that the mobile station is a relay station for wireless communication with the mobile radio.

The wireless communication method of the present invention includes the following steps.
A step of transmitting a relay station search radio wave when the turn comes in accordance with the order related to transmission of the relay station search radio wave;
A step of measuring the electric field strength of the relay station search radio wave when the relay station search radio wave is received from another mobile radio and storing the measured value in association with the other mobile radio as collection information ,
A step of transmitting the collection information when its turn comes in accordance with the order of transmission of the collection information;
When the collected information of the other mobile radio is received from another mobile radio, the collected information of the other mobile radio is added to the own collected information and the own collected information is updated. Step,
The step of determining the mobile radio for the relay station for the radio communication with the mobile radio of the communication partner based on the accumulated collected information, and the mobile radio for the relay station to the determined mobile radio of the relay station A step of notifying that it is a relay station for wireless communication with the mobile wireless device.

  The program of the present invention causes a computer to function as each unit of the wireless communication system or the mobile wireless device of the present invention.

  According to the present invention, since a mobile radio device carried by another user is used as a relay station, a dedicated relay station can be omitted. Moreover, since the point of a relay station can be changed flexibly, it can cope with a wide range of wireless communications.

It shows the current location and radio wave service area of each specific low-power radio in the radio system for specific low-power radio for the one-stage relay. It is a figure which shows the measurement result of the electric field strength of the radio wave for a relay station search in the first half part of a relay station search in case each specific low-power radio | wireless machine exists in the state of FIG. It is a figure which shows the measurement result information which the predetermined radio | wireless machine at the time of completion | finish of Re holds. It is a figure which shows the measurement result information which the predetermined radio | wireless machine at the time of completion | finish of Rc has. It is explanatory drawing of the frequency used in a 1 step | paragraph relay. It is explanatory drawing of the frequency used in a multistage relay.

It shows the current location of each specific low-power radio to which the multistage relay of the specific low-power radio system is applied. It is a figure which shows the collection information accumulated | stored of the predetermined specific low power radio | wireless machine at the time of a relay station search being complete | finished in the condition where each radio | wireless machine exists in the present location shown in FIG. 1 is a block diagram of a wireless communication system. It is a detailed block diagram of a collection means. It is a block diagram of a mobile radio. 5 is a flowchart of a wireless communication method.

  FIG. 1 shows the current location and radio wave service area of each specific low-power radio in the specific low-power radio system 10 for one-stage relay. The radio system 10 for specific low power radios is equipped with a plurality of specific low power radios 15a to 15e. Each user of the specific low-power radio devices 15a to 15e is a member of a predetermined group. Each user does not stop at a specific place during work or entertainment, and arbitrarily moves with his / her specific low-power radio. In the specific low-power radio system 10, each specific low-power radio device, when there is a specific low-power radio device as a communication partner within the reach of the radio wave, Direct communication is possible, but when it is out of service area, in order to communicate with the specific low-power radio device of the communication partner, it is necessary to relay the relay station.

  In FIG. 1, Pa to Pe indicate current points of the specific low power radio devices 15 a to 15 e, respectively. The radio wave service areas 16a to 16e correspond to those of the specific low power radio devices 15a to 15e, respectively. The radio waves of the specific low-power radio devices 15a to 15e are out of service area and cannot be received outside the radio wave service areas 16a to 16e. According to FIG. 1, the specific low-power radio 15a and the specific low-power radio 15e cannot receive each other's radio waves. Further, the specific low-power radio 15b is present at a point where it can receive both radio waves of the specific low-power radio 15a and 15e and can transmit its own radio wave to both of the specific low-power radio 15a and 15e. is doing.

  In order to enable wireless communication between the specific low-power radio devices 15a to 15e, in the conventional wireless communication system, points where radio waves can be received from both the specific low-power radio devices 15a and 15e, for example, the radio wave service area 16a and the radio waves A dedicated relay station is installed at a point in the overlapping area with the service area 16e, and the relay station relays wireless communication between the specific low-power radios 15a-15e. Since the installation location of such a dedicated relay station is fixed, if one of the specific low-power radio devices 15a and 15e subsequently moves out of the range of the dedicated relay station, the relay becomes difficult accordingly. End up.

  On the other hand, in the radio system 10 for the specific low power radio device, the dedicated relay station is omitted, and the relay station is searched from other devices. That is, a search is made for other devices that can wirelessly communicate with both the specific low-power radio devices 15a and 15e, and if found, the other devices are identified as relay stations for wireless communication between the specific low-power radio devices 15a-15e. It is supposed to function as. In the example of FIG. 1, the specific low power radio 15b existing at the point Pb functions as a relay station for radio communication between the specific low power radios 15a-15e.

  In the relay station search, each specific low-power radio transmits a relay station search radio wave in turn, while the other specific low-power radio receives the first part of the field to measure the field strength of the relay station search radio wave received by each The specific low-power radio is divided into the latter part in which the measurement results of the electric field strength measured in the first part are transmitted in order.

  FIG. 2 shows the measurement results of the electric field strength of the relay station search radio wave in the first half of the relay station search when the specific low-power radio devices 15a to 15e are in the state shown in FIG. In FIG. 2 and FIGS. 3 and 4 to be described later, the specific low-power radio devices 15a to 15e are simply described as the radio devices a to e, respectively.

The wireless devices a to e belonging to a predetermined group have a predetermined order set in advance in the first and second search parts of the relay station search. The order is, for example, wireless devices a, b, c, d, e in the first part, and wireless devices e, d, c, b, a in the second part.
Accordingly, the period of the first part of the search is assigned to the radio devices a, b, c, d, and e, and the partial periods Ta, Tb, Tc, Td, and Te are set in that order. Ta, b, Tc, Td, and Te are typically equal values T. The period of the latter part of the search is assigned to each of the radio devices e, d, c, b, a, and the partial periods Re, Rd, Rc, Rb, Ra are set in that order. Re, Rd, Rc, Rb, Ra are typically equal values R 1. Usually, a preparation time for switching is inserted between the partial periods of Ta, Tb, Tc, Td, Te, Re, Rd, Rc, Rb, and Ra.

  Ra can be omitted when the specific low-power radio 15a as a call station in wireless communication that requires a relay station determines the relay station. Further, when the specific low power radio 15a as the call station determines the relay station, the specific low power radio 15a terminates the latter part halfway as soon as the measurement result information of the electric field strength that can determine the relay station is obtained. May be. For example, if measurement result information that can determine a specific low-power radio device to be a relay station is obtained at the end of Rd in the latter part, the latter part of the search for the relay station ends at that point, and Rc After that, you can cancel.

  When the wireless device a intends to perform wireless communication with the wireless device e, the wireless device a transmits a relay station search radio wave having a predetermined electric field strength to the surroundings at Ta. The relay station search radio wave includes at least information related to the ID of the radio that is transmitting the relay station search radio wave, the ID of the radio communication call station that searches for the relay station, and the ID of the called station. . In the embodiment of FIG. 1, the call station is a radio a and the called station is a radio e. In Ta, since the radio a transmits the relay station search radio wave, the ID of the radio transmitting the relay station search radio is the ID of the radio a.

  In this embodiment, the transmission order of the first part and the latter part of the relay station search is set in advance, but the order is not set in advance, and the call station radio sets appropriately for each relay station search. In other words, information related to the order determined by the call station radio can be included in the relay station search radio wave.

  In the embodiment of FIG. 1, it is assumed that there are three levels of electric field strengths of 2, 1, 0. 2, 1, and 0 correspond to strong, weak, and incapable reception, respectively. The relay station search radio wave shown in the table of FIG. 2 is shown by these three stages.

  It should be noted that the level of the electric field intensity of the received radio wave is set to three levels of 2, 1, 0, and is merely an example, and may be set to four levels of 3, 2, 1, 0, or 4, 3, 2, 1, 0. It is also possible to use five stages as appropriate.

  In the embodiment of FIG. 1, the relay station search radio wave transmitted from the wireless device a is received only by the wireless devices b and c. The wireless devices b and c recognize that the relay station search for the wireless communication between the wireless devices a and e has been started by the relay station search radio wave from the wireless device a, and in accordance with the recognition, The subsequent timings Tb to Te and Re to Ra in the station search are determined.

  The radios b and c also measure the field strength of the relay station search radio wave from the radio a at Ta. As a result of the measurement, it is assumed that the electric field intensity levels are 1 and 2 in the wireless devices b and c, respectively. In addition, since the radios d and e do not receive the relay station search radio wave transmitted from the radio a, the radio field intensity of the relay station search radio wave from the radio a cannot be measured. At that time, the measurement level of the electric field strength is set to 0, going back to Ta. For the relay station search radio wave transmitted from the wireless device a, the numerical value of the electric field strength in each wireless device is shown in the first column of the table of FIG.

  At Tb, the wireless device b transmits a relay station search radio wave having a predetermined electric field strength to the surroundings. In the example of FIG. 1, the relay station search radio wave transmitted from the wireless device b is received only by the wireless devices a and e. The wireless device e recognizes for the first time that the relay station search for the wireless communication between the wireless devices a and e is started by the relay station search radio wave from the wireless device b 1, and the subsequent Tc in the relay station search. The timings of ~ Te and Re ~ Ra are determined.

  Although the wireless device c does not receive the relay station search radio wave from the wireless device b at Tb, the timing of Tb has already been determined, so that the wireless devices a, c, e eventually become the wireless device b at Tb. Measure the electric field strength of the relay station search radio wave from. As a result of measurement at Tb, it is assumed that the electric field intensity levels are 1, 0 and 1 in the radio devices a, c and e, respectively. Since the radio device d does not receive the relay station search radio wave transmitted from the radio device b, it cannot measure the electric field strength of the relay station search radio wave from the radio device b. Going back to Tb, the measurement level of the electric field strength is set to zero. With respect to the relay station search radio wave transmitted from the wireless device b, the numerical value of the electric field strength in each wireless device is shown in the second column of the table of FIG.

  At Tc, the wireless device c transmits a relay station search radio wave having a predetermined electric field strength to the surroundings. In the example of FIG. 1, the relay station search radio wave transmitted from the wireless device c is received only by the wireless devices a and d. The wireless device d recognizes for the first time that the relay station search for the wireless communication between the wireless devices a and e is started by the relay station search radio wave from the wireless device c, and Td to Te in the relay station search. Determine the timing.

  Although the radios b and e do not receive the relay station search radio wave from the radio c at Tc, the timings of Tc have been determined, so that the radios a, b, d, and e Then, the electric field strength of the relay station search radio wave from the wireless device b is measured. For the relay station search radio wave transmitted from the wireless device c, the numerical value of the electric field strength in each wireless device is shown in the third column of the table of FIG.

  At Td, the wireless device d transmits a relay station search radio wave having a predetermined electric field strength to the surroundings. In the example of FIG. 1, the relay station search radio wave transmitted from the wireless device d is received only by the wireless device c. The wireless devices a, b, c, and e measure the electric field strength of the relay station search radio wave from the wireless device d. As a result of the measurement, it is assumed that the electric field intensity levels are 0, 0, 1, 0 in the radio devices a, b, d, and e, respectively. For the relay station search radio wave transmitted from the wireless device d, the numerical value of the electric field strength in each wireless device is shown in the fourth column of the table of FIG.

  In Te, the wireless device e 1 transmits a relay station search radio wave having a predetermined electric field strength to the surroundings. In the example of FIG. 1, the relay station search radio wave transmitted from the wireless device e is received only by the wireless device b. The radio devices a, b, c, and d measure the electric field strength of the relay station search radio wave from the radio device e at Te. As a result of the measurement, it is assumed that the electric field intensity levels are 0, 1, 0 and 0 in the radio devices a, b, c and d, respectively. With respect to the relay station search radio wave transmitted from the wireless device e, the numerical value of the electric field strength in each wireless device is shown in the fifth column of the table of FIG.

  After the end of Te, the latter part of the relay station search is started. In Re, the radio equipment e collects information on the field strength measurement result information (information on the measurement values in the fifth row of the table in FIG. 2) of each radio equipment possessed by itself at that time. Send as. Since the wireless device e is the first to perform transmission in the latter part of the relay station search, it does not have the field strength measurement result information of other devices. As each wireless device receives the collected information of the other device from the other device, the wireless device updates the collected information of the own device by adding them. Even if the collection information of the other device is received from another device, the portion overlapping with the collected information portion before update is not updated in principle, but may be overwritten.

  FIG. 3 shows measurement result information held by the wireless devices a and b at the end of Re. Since the radio b receives the radio wave of the radio e in Re but cannot be received by the radio a, the radio b stores the measurement result information of itself and the radio e at the end of the Re. The wireless device a stores only the measurement result information of its own device as the collected information in the storage device of the wireless device a.

  Thereafter, in Rd, the wireless device d transmits the collected information (information on the measurement value in the fourth row of the table in FIG. 2), and in Rc, the wireless device c transmits the collected information (the table in FIG. 2). Information on the measurement values in the third and fourth lines). FIG. 4 shows measurement result information held by the wireless device a at the end of Rc. Since the radio wave of the wireless device e reaches only the wireless device b, the collected information held by the wireless device a does not include that of the wireless device e at the end of Rd, and remains as shown in FIG. At the end of Rc, the wireless device a receives the collected information of the wireless device c from the wireless device c (information on the measurement values in the third and fourth rows in the table of FIG. 2). In addition, the collected information including the measurement result information of the wireless devices c and d is held.

  Thus, the wireless device a can collect all the information shown in FIG. 2 when Rb ends. The wireless device a searches for a wireless device that can serve as a relay station for the wireless communication of the wireless devices a-e based on the collected information of FIG. According to the measurement information in FIG. 2, the wireless device b can communicate with both the wireless devices a and e from the measurement information in the second row in FIG. 2 (the second row corresponds to the wireless device b). Therefore, the wireless device b is selected as a relay station for the wireless communication of the wireless devices ae.

  In the example of the table of FIG. 2, only the wireless device b can communicate with both of the wireless devices a and e. However, when there are a plurality of wireless devices, (a) (1) A relay station having the highest level of electric field intensity of radio waves from radios a and e is determined as a relay station, and (b) a relay having a higher sum of the levels of radios a and e is determined as a relay station. As a specific example of (a), the wireless device b sets the electric field strength of radio waves from the wireless devices a and e to 1 and 1, whereas the wireless device f (the wireless device f is not shown in FIG. 1). If the field strength of radio waves from the radios a and e is 2 and 2, the minimum value 2 of the radio unit f is higher than the minimum value 1 of the radio unit b. Is determined as a relay station for wireless communication between the wireless devices ae. As a specific example of (b), the wireless device b sets the electric field strength of radio waves from the wireless devices a and e to 1 and 1, whereas the wireless device f (not shown) from the wireless devices a and e. In the case where the electric field strength of the radio wave is 1, 2, the sum 3 (= 1 + 2) of the radio device f is higher than the sum 2 (= 1 + 1) of the radio device b. It is determined as a relay station for wireless communication.

  FIG. 5 is an explanatory diagram of frequencies used in the one-stage relay. In the relay, a half-duplex communication method is used. In the above-described example, in the wireless communication between the specific low power radio devices 15a to 15e, the specific low power radio device 15b is a relay station. In transmission from the specific low power radio 15a to the specific low power radio 15e, the specific low power radio 15a uses fa as the frequency of the transmission radio wave. The specific low power radio 15b receives the radio wave with the frequency fa from the specific low power radio 15a and transmits the radio wave with the frequency fb (fb ≠ fa). The specific low power radio 15e receives the radio wave having the frequency fb from the specific low power radio 15b.

  Relay using a mobile specific low-power radio as a relay station without using a dedicated relay station is not limited to a speech channel, but can also be applied to a frequency control channel.

FIG. 6 is an explanatory diagram of frequencies used in the multistage relay. In FIG. 6, in the radio communication from the specific low power radio 15a to the specific low power radio 15e, the specific low power radios 15b, c, d are respectively connected to the first-stage, second-stage and third-stage relay stations. It is assumed that The frequency used in the communication path from the specific low-power radio 15a to the specific low-power radio 15e is initially fa, and each time it is relayed to each relay station, the transmission frequency alternates between fb and fa. It is designed to switch to.

  FIG. 7 shows the current location and radio wave service area of each specific low-power radio in the specific low-power radio system 10 for multi-stage relay. According to FIG. 7, the specific low-power radio 15a and the specific low-power radio 15e cannot receive each other's radio waves. Only the specific low-power radio devices 15b and 15c exist in the radio wave service area 16a of the radio wave from the specific low-power radio device 15a, and the specific low-power radio device 15b includes the specific low-power radio device 15b. Only the radio devices 15a and 15d exist, and only the specific low power radio devices 15b and 15e exist in the radio wave coverage area 16d of the radio waves from the specific low power radio device 15d, and the radio waves of the radio waves from the specific low power radio device 15e. Only the specific low-power radio device 15d exists in the service area 16e. In the situation of FIG. 7, when trying to perform wireless communication from the specific low power radio 15a to the specific low power radio 15e, the specific low power radio 15b becomes the first-stage relay station, and the specific low power radio 15d becomes the first relay station. It is necessary to become a two-stage relay station and relay radio waves.

  FIG. 8 shows the time when the relay station search (transmission of relay station search radio waves from each radio and reception of collected information from each radio) is completed in a situation where each radio exists in the current location shown in FIG. The collected collection information in the specific low-power radio 15a in FIG. In the table of FIG. 8, it can be seen that there is no radio that can communicate with both radios a and e even if one line is examined from top to bottom. That is, wireless communication between the wireless devices ae is difficult by only one-stage relay. Therefore, for example, whether or not multi-stage relay is possible is determined based on the brute force method in the tree structure (considering a tree with a caller as a root and a radio device capable of communicating with each other as a parent node and a child node respectively, All routes are checked, and a route including the wireless device e is searched.). This search is executed by the radio a of the call station.

  It is found that the wireless devices that can communicate from the wireless device a are the wireless devices b and c. Since there are two radios b and c, an appropriate order is assigned to them and the first one is selected. With the first radio set as a one-stage relay station, go to the leaf in the tree, and if the radio e is not found even after reaching the leaf, return to the radio with the next number and repeat the same Repeat that. Here, the wireless devices b and c are selected as the first and second wireless devices, respectively.

  In response to selection of the wireless device b, in the row of the wireless device b in the table of FIG. 8, the wireless device b checks what is available as a wireless device other than the wireless device a, and determines that there is the wireless device d. know. Since there is only one wireless device d, the wireless device d is selected. If there are a plurality of communicable radio devices in the row of the radio device b, an appropriate order is given and the selection is made according to the order as in the case of the previous radio device a.

  In response to selection of the wireless device d, it is found that the wireless device d can communicate with the wireless device e in the row of the wireless device d in the table of FIG. Thus, it is found that in the communication from the wireless device a to the wireless device e, the wireless device b should be the first-stage wireless device and the wireless device d should be the second-stage wireless device.

  In the case of the third stage, the fourth stage,..., The same search is performed to determine the relay station of each stage.

  FIG. 9 is a block diagram of the wireless communication system 30. The wireless communication system 30 includes one each of first and second mobile radio devices 40 and 41 and at least one third mobile radio device 42. The first and second mobile radio devices 40 and 41 exist at points where they cannot receive radio waves from the other party. The third mobile radio device 42 is a mobile radio device different from the first and second mobile radio devices 40 and 41, and the first mobile radio device 40 and 41 have the same configuration as that of the first mobile radio device 40 and 41. It is carried by a user other than the user.

  An example of the radio communication system 30 is the above-described radio system 10 for the specific low-power radio. However, the mobile radio in the radio communication system 30 is not limited to the specific low-power radio, and other portable mobile radios. It may be a wireless device. 1 to 8, the first and second mobile radio units 40 and 41 correspond to the specific low power radio units 15a and 15e, and the third mobile radio unit 42 corresponds to the specific low power radio unit. Corresponds to the machines 15b, 15c, 15d. The radio communication system 30 includes a relay station searching radio wave transmission unit 31, a measurement unit 32, a collection unit 33, a determination unit 34, and a relay operation unit 35. The radio communication system 30, the relay station searching radio wave transmitting means 31, the measuring means 32, the collecting means 33, the determining means 34, and the relay actuating means 35 are all one mobile radio, for example, the first mobile radio. It is not limited to being mounted on the device 40, but may be distributed and mounted on each mobile radio device. However, in the case of distributed implementation, communication between means must be ensured.

  The relay station searching radio wave transmitting means 31 is configured to search for a relay station in each mobile radio (the first and second mobile radios 40 and 41 and the third mobile radio 42) in the first order. Send radio waves. The measuring means 32 causes each mobile radio to measure the electric field strength of the relay station search radio wave from each other mobile radio. The collection unit 33 collects information related to the measurement result of the electric field strength in each mobile radio as collection information. The determining unit 34 determines the third mobile radio device 42 serving as a relay station for the radio communication between the first and second mobile radio devices 40 and 41 based on the collected information. The relay actuating means 35 operates the third mobile radio device 42 determined as the relay station as a relay station during radio communication between the first and second mobile radio devices 40 and 41.

  In the example of the specific low power radio system 10, the first order is the order of radios a, b, c, d, and e corresponding to Ta, Tb, Tc, Td, and Te. The collection information collected by the collection unit 33 is, for example, the information shown in FIGS.

  Thus, the wireless communication system 30 can perform wireless communication between the first mobile wireless device 40 and the second mobile wireless device 41 by omitting a dedicated relay station. In addition, when a dedicated relay station is fixedly arranged at a predetermined point and relays at that point, the first and second mobile radio devices 40 and 41 can communicate by relaying the relay station. Although the area is fixed, in the wireless communication system 30, one or both of the first and second mobile wireless devices 40 and 41 is the third mobile wireless device 42 that first becomes a relay station. If another third mobile radio device 42 exists at a point where it can be relayed even if it goes out of the radio wave range, the first mobile radio device 40 is relayed by the other third mobile radio device 42. -Communication between the second mobile radio devices 41 becomes possible, so that the communicable area can be expanded.

  Hereinafter, a preferable aspect or embodiment of the wireless communication system 30 will be described.

  FIG. 10 is a detailed block diagram of the collecting means 33. The collection unit 33 includes an information transmission unit 45 and an information update unit 46. The information transmission unit 45 causes each mobile radio to transmit the collected information in each mobile radio according to the second order. The information update means 46 causes each mobile radio to update its own collection information based on the collection information received from other machines.

  The second order is the order of the radios e, d, c, b, a corresponding to the order of Re, Rd, Rc, Rb, Ra in the example of the radio system 10 for the specific low power radio. . In this example, the second order is the reverse order of the first order. When the order is reversed, the collected information that can determine the relay station is likely to be gathered at a predetermined mobile radio device earlier.

  The first in the first order is the first mobile radio 40, and the determining means 34 is provided in the first mobile radio. In the example of the radio system 10 for the specific low power radio device, the first mobile radio device 40 in the first order is the first mobile radio device 40, and the determining unit 34 is provided in the first mobile radio device 40.

  FIG. 11 is a block diagram of the mobile radio device 50. The mobile wireless device 50 is typically a wireless communication call device (specific low-power wireless device 15a in FIGS. 1 and 8), but a wireless communication called device (in FIGS. 1 and 8). It may be a specific low power radio 15e) or a mobile radio other than the caller and the callee (specific low power radios 15b, 15c, 15d in the examples of FIGS. 1 and 2). The mobile radio device 50 includes relay station search radio wave transmission means 51, measurement means 52, collection means 53, determination means 54, and notification means 55.

  In FIG. 11, when the mobile radio device 50 is a call device, the mobile radio device 59 includes a called device and other mobile radio devices. When the mobile wireless device 50 is a called device, the mobile wireless device 59 includes a call device and other mobile wireless devices.

  The relay station search radio wave transmission means 51 transmits a relay station search radio wave. The measuring means 52 measures the electric field strength of the relay station search radio wave from each of the other mobile radio devices 59. The collection unit 53 collects measurement result information about the electric field strength in each mobile radio device 59 as collection information. The determining means 54 determines the relay station mobile radio 59 for radio communication with the mobile radio of the communication partner based on the accumulated collected information. The notification means 55 notifies the determined relay station mobile radio 59 that it will become a relay station for radio communication between the mobile station and the mobile radio of the communication partner.

  The mobile radio devices 50 and 59 typically have the same configuration. That is, the mobile radio device 50 can be a relay station or a called device, and the mobile radio device 59 can be a call device or a called device. In response to such a case, the mobile radio device 59 is also equipped with a relay station search radio wave transmission means 51, a measurement means 52, a collection means 53, a determination means 54, and a notification means 55, similarly to the mobile radio equipment 50. be able to.

  The measurement result information collected by the collecting means 53 is, for example, as shown in FIG.

  Hereinafter, a preferable or specific configuration of the mobile radio device 50 will be described.

  The mobile radio device 50 further includes relay means 65. The relay unit 65 relays the predetermined wireless communication when the mobile unit 59 is notified that the mobile device 59 is to be a relay station for the predetermined wireless communication.

  The radio waves for searching for a relay station in the mobile radio device 50 and the above-described radio communication system 30 (FIG. 10) include information related to a radio communication caller and a callee that require relaying.

  The collection unit 53 can include an information transmission unit 45 and an information update unit 46, similarly to the collection unit 33 of FIG. The information transmitting unit 45 of the collecting unit 53 transmits the collected information of the own device. The information updating unit 46 of the collecting unit 53 updates the collected information of the own device based on the collected information received from another mobile radio device.

  FIG. 12 is a flowchart of the wireless communication method 70. The radio communication method 70 includes a relay station search radio wave transmission routine 71, a measurement routine 72, a collection information transmission routine 73, a collection information update routine 74, and a relay station mobile radio determination routine 75. The wireless communication method 70 is applied to the mobile wireless device 50. The collection information update routine 74 is not determined to be executed after the collection information transmission routine 73, and is executed before the collection information transmission routine 73 or before the collection information transmission routine 73. It is executed both in the back.

  The relay station search radio wave transmission routine 71 is executed when its own turn in the order related to transmission of the relay station search radio wave comes (determination in S80 is “correct”). In S81, a relay station search radio wave is transmitted.

  The measurement routine 72 is executed when a relay station search radio wave is received from another mobile radio device 59 (determination in S84 is “correct”). In S85, the electric field strength of the relay station search radio wave is measured, and the measured value is stored in association with the other mobile radio device 59 as collected information.

  The collection information transmission routine 73 is executed when its own turn in the order relating to the collection information transmission comes (the determination in S88 is “correct”). In S89, the collection information is transmitted.

  The collection information update routine 74 is executed when the collection information of the other mobile radio device 59 is received from the other mobile radio device 59 (the determination in S92 is “correct”). In S93, the collected information of the other mobile radio device 59 is added to the collected information of its own, and its collected information is updated.

  The relay station mobile radio determination routine 75 is executed at least when collected information that can determine the relay station mobile radio 59 is accumulated (determination in S95 is “correct”). In S96, the relay station mobile radio 59 for radio communication with the communication counterpart mobile radio is determined based on the collected information. In S97, it notifies the determined relay station mobile radio 59 that it will become a relay station for radio communication between the mobile station and the mobile radio of the communication partner.

  The program to which the present invention is applied causes a computer to function as each unit of the wireless communication system 30 or the mobile wireless device 50. Another program to which the present invention is applied causes a computer to execute each step of the wireless communication method 70.

  Although the present invention has been described with respect to the best mode, it is needless to say that the present invention is not limited to this and can be implemented in various forms within the scope of the gist.

30: Radio communication system, 31: Radio transmission means for searching for relay station, 32: Measuring means, 33: Collecting means, 34: Determination means, 35: Relay operation means, 40: First mobile radio, 41: First 2 mobile radio equipment, 42: third mobile radio equipment, 45: information transmission means, 46: information update means, 50: mobile radio equipment, 51: radio wave transmission means for search for relay station, 52: measurement means 53: Collection means, 54: Determination means, 55: Notification means, 59: Mobile radio, 65: Relay means, 70: Wireless communication method.

Claims (10)

Each of the first and second mobile radio devices present at points where radio waves from the other party cannot be received from each other, and different from the first and second mobile radio devices At least one third mobile radio device that is a mobile radio device and is carried by a user other than the users of the first and second mobile radio devices;
In a wireless communication system having
Relay station search radio wave transmission means for causing each mobile radio to transmit a relay station search radio wave according to the first order;
Measuring means for causing each mobile radio to measure the electric field strength of relay station search radio waves from each other mobile radio,
A collecting means for collecting information related to the measurement result of the electric field strength in each mobile radio as collection information;
Determining means for determining a third mobile radio as a relay station for radio communication between the first and second mobile radios based on the collected information; and a third mobile radio determined by the relay station Relay actuating means for actuating a mobile radio as a relay station during radio communication between the first and second mobile radios;
A wireless communication system characterized by comprising: The collecting means includes
In accordance with the second order, each mobile radio device transmits information collected by each mobile radio device, and each mobile radio device collects its own information based on the collected information received from another device. Information updating means for updating
The wireless communication system according to claim 1, further comprising:   The wireless communication system according to claim 1, wherein the second order is an order opposite to the first order. No. 1 in the first order is the first mobile radio,
The wireless communication system according to claim 1, wherein the determination unit is provided in the first mobile radio device. Relay station search radio wave transmission means for transmitting relay station search radio waves,
Measuring means for measuring electric field strength of relay station search radio waves from each other mobile radio,
Collection means for collecting measurement result information on the electric field strength in each mobile radio as collection information;
Determination means for determining a mobile radio device for a relay station for wireless communication with a mobile radio device of a communication partner based on the accumulated collected information, and communication with the own device to the determined mobile radio device for a relay station Notifying means for notifying that it will be a relay station for wireless communication with the other mobile radio,
A mobile radio device characterized by comprising: A relay means for relaying the predetermined wireless communication when notified from another mobile wireless device that the own device is a relay station for the predetermined wireless communication;
6. The mobile radio device according to claim 5, further comprising: The collecting means includes
Information transmitting means for transmitting the collected information of the own apparatus, and information updating means for updating the collected information of the own apparatus based on the collected information received from another mobile radio,
The wireless communication system according to claim 5 or 6, characterized by comprising:   The mobile radio according to any one of claims 5 to 7, wherein the relay station search radio wave includes information relating to a radio communication caller and a callee that require relaying. A step of transmitting a relay station search radio wave when the turn comes in accordance with the order related to transmission of the relay station search radio wave;
A step of measuring the electric field strength of the relay station search radio wave when the relay station search radio wave is received from another mobile radio and storing the measured value in association with the other mobile radio as collection information ,
A step of transmitting the collection information when its turn comes in accordance with the order of transmission of the collection information;
When the collected information of the other mobile radio is received from another mobile radio, the collected information of the other mobile radio is added to the own collected information and the own collected information is updated. Step,
A step of determining a mobile radio for a relay station for radio communication with a mobile radio of a communication partner based on the accumulated collected information, and the mobile radio for the relay station determined to the mobile station and the communication partner A step of notifying that it becomes a relay station for wireless communication with the mobile radio of
A wireless communication method characterized by comprising: The program for functioning a computer as each means of the mobile radio | wireless machine in any one of Claims 5-8.

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