JP5609385B2 - Wireless communication system, wireless communication method, and relay station used in wireless communication system - Google Patents

Description

  The present invention relates to a radio communication system, a radio communication method, and a relay station used in the radio communication system, and is applicable to, for example, a mobile communication system.

  Mobile communication systems have become widespread, and the coverage of communication areas of base stations has increased considerably. However, depending on the position of the terminal station, the terminal station may not be able to receive radio waves from the base station. For example, when a terminal station is located in a building or vehicle where radio waves are shielded, the terminal station may not be able to perform wireless communication. For this reason, a system has been proposed in which a relay station is provided in a building or vehicle, and communication is performed between the base station and the terminal station via the relay station.

  An adaptive mobile communication system that can easily, quickly and inexpensively extend the communication distance between a base station and a mobile station has been proposed. In this mobile communication system, during communication, a relay station receives a signal transmitted by a base station at a frequency fA-BS assigned to the base station, and converts the signal into a signal of a frequency fB-BS different from the frequency fA-BS. To the mobile station with the base station regulations transmission power or the mobile station regulations transmission power. Also, relay beacon information REP is added to the signal transmitted by the relay station, and relay beacon information MS is added to the transmission signal of the mobile station communicating with the relay station. A relay station that relays between the base station and the mobile station using the same radio frequency and the standard transmission power of the same communication method, so that the communication distance can be easily, quickly and inexpensively acquired without newly acquiring the radio frequency band for relay. The service area can be extended to (For example, Patent Document 1)

  In addition, a wireless relay method that suppresses deterioration in communication quality due to self-interference has been proposed. The radio relay apparatus used in this method relays and transmits from the first radio communication unit corresponding to the base station, the second radio communication unit corresponding to the terminal, and the first and second radio communication units. A relay control unit that performs processing is provided. The relay control unit includes a time slot used in the first radio communication unit corresponding to the line call control on the base station side, and a time used in the second radio communication unit corresponding to the line call control on the terminal side. A function of assigning slots to time slots having different slot numbers is provided. (For example, Patent Document 2)

  Furthermore, a method for realizing group communication outside the base station service area has been proposed. In this method, a group call signal from a mobile station that activates a group call enters a group mode, and the mobile station functions as a base station, so that other mobile stations in the radio wave arrival area of the mobile station Without changing the reception frequency to the transmission frequency, group communication is operated with the same system function as in the base station service area. (For example, Patent Document 3)

Furthermore, a technique related to a scheduling method for a plurality of carriers has been proposed. In this method, the transmitting unit simultaneously transmits at least a first data block on a first data carrier and a second data block on a second data carrier during a communication session with the receiving unit. The receiving unit selects whether to receive the first or second data block based on the reception quality of the previously received data block. (For example, Patent Document 4)
Furthermore, Patent Documents 5 to 7 describe related techniques.

JP 2000-31877 A JP 2004-349875 A Japanese Patent Laid-Open No. 11-308665 Special table 2008-541607 gazette JP 2005-229187 A JP 2000-134143 A JP 2007-228509 A

  In a conventional technology, in a wireless communication system including a relay station between a base station and a terminal station, when the terminal station moves from the communication area of the base station into the communication area of the relay station or when the terminal station is a relay station When moving from one communication area to another, communication may be interrupted or signals from the base station may not be received.

  An object of the present invention is to reduce communication interruption or reception omission in a wireless communication system including a relay station between a base station and a terminal station.

  A radio communication method according to one aspect of the present invention performs communication by a time division multiplexing method in a radio communication system in which a relay station is provided between a base station and a terminal station. In this wireless communication method, the base station transmits downlink data on a first downlink frequency using a base station time slot allocated to the base station, and the relay station The downlink data received from the base station is transmitted on the second downlink frequency different from the first downlink frequency using the base station time slot, and the terminal station transmits the downlink data to the base station. When received from the station, the uplink data is transmitted on the first uplink frequency using the terminal station time slot allocated to the terminal station, and the downlink data is received from the relay station. When using the terminal time slot, the uplink frequency is different from the first uplink frequency at a second uplink frequency. The relay station transmits the uplink data transmitted from the terminal station on the second uplink frequency using the terminal station time slot on the first uplink frequency. .

  According to the configuration or method disclosed in the present application, communication interruption or reception omission is reduced in a wireless communication system including a relay station between a base station and a terminal station.

It is a figure which shows the structure of the radio | wireless communications system of embodiment. It is a figure which shows the structure of a relay station and a terminal station. It is FIG. (1) explaining operation | movement of a relay station and a terminal station. It is FIG. (2) explaining operation | movement of a relay station and a terminal station. It is FIG. (3) explaining operation | movement of a relay station and a terminal station. It is an Example of the time chart of the data transfer by a base station, a relay station, and a terminal station. It is a figure which shows an example of the content of system control data. It is a figure explaining synchronous control by system control data. It is an Example of the time chart of the data transfer by several base stations, a relay station, and a terminal station. It is a figure which shows the Example of a structure of a relay station. It is a figure which shows the other Example of a structure of a relay station. It is a flowchart which shows operation | movement of a relay station. It is a figure which shows the Example of a structure of a terminal station. It is a flowchart (the 1) which shows operation | movement of a terminal station. It is a flowchart (the 2) which shows operation | movement of a terminal station. It is a figure which shows the modification of a relay station. It is a figure which shows the other modification of a relay station. It is a figure which shows the structure of the radio | wireless communications system of other embodiment. It is a figure which shows the structure of the radio | wireless communications system of other embodiment. It is a figure which shows the other Example of the relay station used with the system shown in FIG. It is a figure which shows the other Example of the terminal station used with the system shown in FIG.

FIG. 1 is a diagram illustrating a configuration of a wireless communication system according to an embodiment. The wireless communication system of the embodiment includes a base station 1, terminal stations 2 (2 a to 2 c), and a relay station 3.
The base station 1 transmits / receives a radio signal to / from the terminal station 2 and / or the relay station 3 via a radio link. Here, the wireless communication system of the embodiment includes one or a plurality of base stations 1 and a plurality of terminal stations 2. In the wireless communication system according to the embodiment, data is transmitted by the time division multiplexing method. Note that the radio signal is generated, for example, by modulating a carrier wave with transmission data. In this case, the modulation method is not particularly limited, and frequency modulation, intensity modulation, and the like can be employed.

  The terminal station 2 is, for example, a mobile terminal device that can be carried by a user, and can transmit and receive radio signals to and from the base station 1. The terminal station 2 can also transmit and receive radio signals to and from the relay station 3.

  The terminal station 2 basically transmits and receives radio signals to and from the base station 1. However, the terminal station 2 cannot receive radio waves from the base station 1 when located in the radio wave shield area 4. Therefore, the wireless communication system according to the embodiment includes the relay station 3 in order to avoid such a situation. The relay station 3 is provided at a position where wireless communication with the base station 1 is possible and wireless communication with the terminal station 2 in the radio wave shield area 4 is possible. That is, the relay station 3 transmits / receives a radio signal to / from the base station 1 via the external antenna, and transmits / receives a radio signal to / from the terminal station 2 in the radio wave shield area 4 via the internal antenna. The radio wave shield area 4 can be generated in, for example, a vehicle, a building, or an underground mall.

  The terminal station 2 and the relay station 3 have a function of receiving the GPS radio wave transmitted from the GPS satellite 5 and calculating the position of the own station. In general, it is difficult to receive not only communication radio waves transmitted from the base station 1 but also GPS radio waves inside the radio wave shield area 4.

  In the wireless communication system configured as described above, the terminal station 2 a is located outside the radio wave shield area 4. In this case, the terminal station 2 a directly transmits and receives radio signals to and from the base station 1. Further, the terminal station 2 b is located inside the radio wave shield area 4 and cannot receive communication radio waves transmitted from the base station 1. In this case, the terminal station 2 b transmits and receives radio signals to and from the base station 1 via the relay station 3. The terminal station 2 c is located near the entrance / exit of the radio wave shield region 4 and receives communication radio waves from the base station 1 and the relay station 3. In this case, the terminal station 2c selects either the base station 1 or the relay station 3 using a predetermined algorithm, and transmits a radio signal to the selected communication device.

  FIG. 2 is a diagram illustrating configurations of the relay station 3 and the terminal station 2 according to the embodiment. In FIG. 2, the base station 1 transmits downlink data to the terminal station 2 using a downlink signal having a frequency f1. When the terminal station 2 is in the radio wave shield area 4, the downlink data is transmitted from the base station 1 to the terminal station 2 via the relay station 3. Further, the base station 1 receives an uplink signal having a frequency f1 transmitted from the terminal station 2 or the relay station 3. The uplink signal transmits uplink data transmitted from the terminal station 2.

  The relay station 3 includes a reception unit 11, a control unit 12, a downlink repeater 13, and an uplink repeater 14. The receiving unit 11 receives and demodulates a downlink signal transmitted from the base station 1. The receiving unit 11 may receive and demodulate an uplink signal transmitted from the terminal station 2. Then, the signal demodulated by the receiving unit 11 is input to the control unit 12.

  The control unit 12 includes a microcomputer and a memory, and controls each circuit element (including the downlink repeater 13 and the uplink repeater 14) of the relay station 3. The memory includes a nonvolatile memory, and stores a control program, control parameters, a station number for identifying the base station 1, a number of a time slot assigned to the base station 1, and the like. Further, the control unit 12 decodes the received signal from the base station 1 and reproduces and interprets the downlink data.

  The downlink repeater 13 performs frequency conversion of the downlink signal received via the external antenna, and transmits it via the internal antenna. Thereby, the downlink data is transmitted to the terminal station 2 located in the radio wave shield area 4. At this time, the downlink repeater 13 converts the radio frequency of the downlink signal from f1 to f2. Here, the frequency f2 may be higher than the frequency f1 or lower than the frequency f1. Note that the time required for radio frequency conversion is negligibly short compared to the time slot of the radio communication system of the embodiment.

  The uplink repeater 14 performs frequency conversion of the uplink signal received via the internal antenna, and transmits it via the external antenna. As a result, uplink data transmitted from the terminal station 2 located in the radio wave shield area 4 is transmitted outside the radio wave shield area 4. At this time, the uplink repeater 14 converts the radio frequency of the uplink signal from f2 to f1.

  The terminal station 2 includes a receiving unit (f1) 25, a receiving unit (f2) 26, a transmitting unit 27, a GPS receiving unit 23, and a control unit 24. The receiving unit 25 receives and demodulates the downlink signal having the frequency f1. That is, the receiving unit 25 demodulates the downlink signal transmitted from the base station 1. Then, the signal demodulated by the receiving unit 25 is input to the control unit 24. Further, the transmission unit 27 transmits uplink data at the frequency f1 in accordance with an instruction from the control unit 24. Similarly, the receiving unit 26 receives and demodulates the downlink signal having the frequency f2. That is, the receiving unit 26 demodulates the downlink signal transmitted from the relay station 3. The signal demodulated by the receiving unit 26 is also input to the control unit 24. Further, the transmission unit 27 switches to the frequency f2 in accordance with an instruction from the control unit 24 and transmits uplink data.

  The terminal station 2 can simultaneously receive the downlink signal having the frequency f1 and the downlink signal having the frequency f2. That is, the terminal station 2 can simultaneously receive the downlink signal transmitted from the base station 1 and the downlink signal relayed by the relay station 3.

  The GPS receiving unit 23 receives GPS radio waves transmitted from a plurality of GPS satellites 5 and generates coordinate information. The coordinate information calculated by the GPS receiving unit 23 and the accompanying coordinate accuracy information are input to the control unit 24.

  The control unit 24 includes a microcomputer and a memory, and controls each circuit element (including the reception units 25 and 26 and the transmission unit 27) of the terminal station 2. Further, the control unit 24 decodes the received signal from the base station 1 or the relay station 3 to reproduce the downlink data, and interprets the content of the downlink data. Furthermore, when receiving the downlink data from the base station 1, the control unit 24 transmits the uplink data using the transmission unit 27. In this case, uplink data is transmitted at the frequency f1. On the other hand, when receiving the downlink data from the relay station 3, the control unit 24 uses the transmission unit 27 to switch the uplink data to the frequency f2 and transmit it.

  The terminal station 2 further includes a power supply unit 31 and a connection box 32. The power supply unit 31 incorporates, for example, a lithium ion battery and supplies power to each circuit element of the terminal station 2. In the example shown in FIG. 2, a light receiver (PD) 33 and a firearm interface (I / F) 34 are connected to the connection box 32. The light receiver 33 and the firearm interface 34 will be described later.

  3 to 5 are diagrams for explaining the operations of the relay station 3 and the terminal station 2. 3 to 5, the base station 1 transmits and receives a radio signal using a carrier wave having a frequency f1. Further, it is assumed that a time slot (base station slot) for the base station 1 to transmit downlink data is determined in advance in the radio communication system. Also, the terminal station 2 transmits uplink data using the terminal station slot. The terminal station slot is indicated by transmission permission data transmitted from the base station 1. Alternatively, the terminal slot is predetermined within the wireless communication system.

FIG. 3 is a diagram for explaining the operation of the terminal station 2 when the terminal station 2 is located outside the radio wave shield area 4. The terminal station 2 corresponds to the terminal station 2a in the example shown in FIG.
Base station 1 transmits a downlink signal at frequency f1 using the base station slot. The downlink signal is a radio signal that transmits downlink data. In the environment shown in FIG. 3, the terminal station 2 receives the downlink signal transmitted from the base station 1 without going through the relay station 3. Then, the terminal station 2 transmits an uplink signal in a predetermined terminal station slot or in the terminal station slot indicated by the transmission permission data transmitted from the base station 1. The uplink signal is a radio signal that transmits uplink data.

  Since the terminal station 2 receives the downlink signal from the base station 1, the terminal station 2 transmits the uplink signal using the frequency f1. This uplink signal is transmitted to the base station 1 without passing through the relay station 3. As described above, when the terminal station 2 is located outside the radio wave shield area 4, a data signal is transmitted and received between the base station 1 and the terminal station 2 using the frequency f1.

  In the state shown in FIG. 3, the downlink signal transmitted from the base station 1 can also be received by the relay station 3. When the relay station 3 receives the downlink signal from the base station 1, the relay station 3 executes a process of transmitting the downlink data signal in the radio wave shield area 4. However, in FIG. 3, the relay station 3 is omitted.

FIG. 4 is a diagram for explaining the operation of the terminal station 2 and the relay station 3 when the terminal station 2 is located in the radio wave shield area 4. The terminal station 2 corresponds to the terminal station 2b in the example shown in FIG.
Similarly to the example shown in FIG. 3, the base station 1 transmits a downlink signal at the frequency f1 using the base station slot. The downlink signal is received by the relay station 3 but does not reach the terminal station 2 located in the radio wave shield area 4.

  When the relay station 3 receives the downlink signal from the base station 1, the relay station 3 transmits the downlink signal to the terminal station 2 located in the radio wave shield area 4 via the internal antenna. At this time, the downlink repeater 13 of the relay station 3 converts the radio frequency of the downlink signal from f1 to f2. Further, the relay station 3 transmits a downlink signal to the terminal station 2 using the base station slot without changing the time slot. The downlink repeater 13 performs frequency conversion of a radio signal, but does not perform data reproduction processing. Therefore, the delay time in the downlink repeater 13 is sufficiently shorter than one time slot. Therefore, the relay station 3 can transmit a downlink signal using the base station slot.

  The terminal station 2 receives the downlink signal transmitted from the relay station 3. Then, the terminal station 2 transmits an uplink signal using the terminal station slot, similarly to the example shown in FIG. However, in the example shown in FIG. 4, since the terminal station 2 receives the downlink signal from the relay station 3, the terminal station 2 transmits the uplink signal using the frequency f2.

  The uplink signal transmitted from the terminal station 2 reaches the internal antenna of the relay station 3. The relay station 3 transmits the received uplink signal via an external antenna. At this time, the uplink repeater 14 of the relay station 3 converts the radio frequency of the uplink signal from f2 to f1. That is, the relay station 3 transmits uplink data to the base station 1 using a carrier wave having a frequency f1. Further, the relay station 3 transmits an uplink signal to the base station 1 using the terminal station slot without changing the time slot. Note that the uplink repeater 14 performs frequency conversion of the radio signal, but does not perform data reproduction processing. Therefore, the delay time in the uplink repeater 14 is sufficiently shorter than one time slot. Therefore, the relay station 3 can transmit an uplink signal using the terminal station slot. Then, the base station 1 receives an uplink signal transmitted from the relay station 3.

  As described above, when the terminal station 2 is located in the radio wave shield area 4, data communication between the base station 1 and the terminal station 2 is realized via the relay station 3. At this time, the base station 1 receives the uplink signal having the frequency f1 in the terminal station slot. That is, the base station 1 receives the uplink signal from the relay station 3 under the same conditions (timing and frequency) as when receiving the uplink signal directly from the terminal station 2.

  When the relay station 3 relays the downlink signal, the relay station 3 converts the frequency of the carrier wave from f1 to f2. That is, the frequency of the received wave and the frequency of the transmitted wave are different. Therefore, when relaying the downlink signal in the relay station 3, the output radio wave does not circulate to the input side and oscillation does not occur. Similarly, the relay station 3 converts the frequency of the carrier wave from f2 to f1 when relaying the uplink signal. Thus, oscillation does not occur when the relay station 3 relays the uplink signal.

FIG. 5 is a diagram for explaining the operation of the terminal station 2 that receives radio signals from both the base station 1 and the relay station 3. The terminal station 2 corresponds to the terminal station 2c in the example shown in FIG.
The base station 1 transmits a downlink signal at the frequency f1 using the base station slot, similarly to the example shown in FIG. 3 or FIG. This downlink signal is received by the terminal station 2 and also by the relay station 3.

  The operation of the relay station 3 is the same as the example shown in FIG. That is, the relay station 3 converts the radio frequency of the downlink signal from f1 to f2, and transmits the downlink signal to the terminal station 2 using the base station slot.

  The terminal station 2 receives the downlink signal from the base station 1 in the base station slot and also receives the downlink signal from the relay station 3 in the same base station slot. That is, the terminal station 2 receives downlink signals from the base station 1 and the relay station 3 in the same time slot. However, the radio frequency of the downlink signal received from the base station 1 is f1, whereas the radio frequency of the downlink signal received from the relay station 3 is f2.

  The terminal station 2 determines whether to transmit the uplink signal directly to the base station 1 or to the relay station 3. At this time, for example, the terminal station 2 determines the transmission destination of the uplink signal according to the reception status of the radio signal for obtaining the position information of each communication device (base station, relay station, terminal station, etc.). In this example, the transmission destination of the uplink signal is determined according to the reception status of GPS radio waves. Alternatively, the terminal station 2 may determine the destination of the uplink signal according to the strength of the received radio waves from the base station 1 and the relay station 3. When the terminal station 2 transmits an uplink signal directly to the base station 1, the terminal station 2 uses the frequency f1. On the other hand, when the terminal station 2 transmits an uplink signal to the relay station 3, the terminal station 2 uses the frequency f2.

  When the relay station 3 receives the uplink signal having the frequency f2 from the terminal station 2, the relay station 3 performs a relay operation similar to the example shown in FIG. That is, the relay station 3 converts the radio frequency of the uplink signal from f2 to f1, and transmits the uplink signal to the base station 1.

  Thus, the terminal station 2 receives the downlink signal from both the base station 1 and the relay station 3 depending on the position. At this time, the base station 1 transmits a downlink signal to the terminal station 2 at the frequency f1. On the other hand, the relay station 3 transmits a downlink signal to the terminal station 2 at the frequency f2. Therefore, even if a downlink signal is transmitted from both the base station 1 and the relay station 3 in the same time slot, the two downlink signals do not interfere with each other. Therefore, even when the terminal station 2 moves from the outside of the radio wave shield area 4 to the inside thereof, or when the terminal station 2 moves from the inside of the radio wave shield area 4 to the outside thereof, the base station 1 and the terminal station 2 The data communication between them is not interrupted.

  As described with reference to FIGS. 4 to 5, when the relay station 3 is interposed in the transmission of the downlink data from the base station 1 to the terminal station 2, the relay station 3 uses the base station slot. The downlink data is transmitted to the terminal station 2. When relay station 3 is interposed in transmission of uplink data from terminal station 2 to base station 1, relay station 3 transmits the uplink data to base station 1 using the terminal station slot. . That is, when the relay station 3 is interposed in the data communication between the base station 1 and the terminal station 2, the relay station 3 does not use a new time slot in addition to the base station slot and the terminal station slot. Therefore, according to the wireless communication method of the embodiment, it is possible to prevent interruption of data communication between the base station 1 and the terminal station 2 without increasing the consumption of communication resources (here, time slots). As a result, the number of terminal stations 2 that can be accommodated in the base station 1 can be increased.

  FIG. 6 is an example of a time chart of data transfer by the base station 1, the relay station 3, and the terminal station 2. Here, in order to make the drawing easy to see, a sequence in a system in which one base station, one relay station, and one terminal station are provided is shown.

  In the wireless communication system of the embodiment, a predetermined time slot (base station slot) is assigned to the base station 1. Then, the base station 1 transmits downlink data to the terminal station 2 using its own base station slot. Downlink data transmitted from the base station 1 is, for example, system control data a, position correction data b, control data c, transmission permission data d, and reception confirmation data e.

  The system control data a includes an instruction for the terminal station 2 and is transmitted periodically. The system control data a will be described in detail later. The position correction data b includes an instruction for correcting the position information of the terminal station 2 based on the GPS radio wave received by the GPS reference station installed in the base station 1. With this position correction data b, for example, differential GPS with the base station 1 as a reference position is realized. The GPS reference station does not necessarily have to be installed in the base station 1, and may be installed in the vicinity of the collection control device described later. The control data c includes various instructions and various information to be notified from the base station 1 to the terminal station 2. The transmission permission data d includes information for notifying the terminal station 2 that has transmitted the transmission reservation data f of an available time slot (terminal station slot). The reception confirmation data e includes information for notifying the terminal station 2 that has transmitted the main data h that the data has been received.

  The terminal station 2 transmits uplink data to the base station 1. The uplink data is, for example, transmission reservation data f, position data g, and main body data h. The transmission reservation data f includes a request for reserving a time slot for transmitting the main data h. The transmission reservation data f is transmitted using a short time slot assigned in advance to each terminal station. The position data g includes the position information of the terminal station 2 obtained from the GPS receiving unit 23. The position data g may be transmitted periodically. The main body data h includes information generated in response to a request from the base station 1, and information that the terminal station 2 voluntarily notifies the base station 1. When transmitting the main body data h, the terminal station 2 requests the terminal station slot from the base station 1 using the transmission reservation data f. Then, the terminal station 2 transmits the main body data h using the terminal station slot notified by the transmission permission data d.

  FIG. 7 is a diagram illustrating an example of the contents of the system control data. In FIG. 7, a code for identifying system control data is written as the data type ID. The base station slot number is information representing a time slot assigned to each base station. The operation mode instruction indicates the operation mode of the terminal station 2. The time information represents the current date and time.

  Although the system control data is not shown in FIG. 7, various other information can be transmitted. For example, the system control data may include an uplink frequency indication code that indicates the frequency of the carrier wave when the terminal station 2 transmits uplink data. 2 to 5, the base station 1 sets a code indicating the frequency f1 as the uplink frequency instruction code. The system control data may include information indicating the reception frequency, information indicating the transmission power of the terminal station, and the like.

  FIG. 8 is a diagram for explaining the synchronization control based on the system control data. A synchronization character having a predetermined data pattern is set at the head of the system control data. Then, when the terminal station 2 and the relay station 3 receive the system control data, the terminal station 2 and the relay station 3 start a timer using a synchronization character as a trigger. Also, the terminal station 2 and the relay station 3 decode the received system control data to detect a base station slot number, and calculate a timer time corresponding to the detected slot number. Further, the terminal station 2 and the relay station 3 generate a time chart based on the calculated timer time, and change the timer setting. This time chart includes information representing a base station slot. Then, the terminal station 2 and the relay station 3 start the data communication operation at the timing when the timer expires. Thereby, the terminal station 2 and the relay station 3 can perform a data communication operation synchronized with the base station 1. The terminal station 2 and the relay station 3 perform synchronization control based on the system control data received first, for example.

  As described above, in the example illustrated in FIGS. 6 to 8, the terminal station 2 executes the synchronization control based on the system control data transmitted from the base station 1. In other words, if the terminal station 2 fails to receive the system control data transmitted from the base station 1, it must wait for the system control data of the next cycle. Therefore, in this wireless communication system, it is important to avoid reception omission of system control data in the terminal station 2.

  Next, data communication in the wireless communication system of the embodiment will be described with reference to FIG. In this example, first, the base station 1 transmits the system control data a1 to the terminal station 2 using a base station slot assigned to the base station 1. At this time, the base station 1 transmits the system control data a1 at the frequency f1. Note that a base station slot number is set in the system control data a1.

  When receiving the system control data a1 from the base station 1, the relay station 3 transmits the system control data a2 to the terminal station 2. At this time, in the relay station 3, the downlink repeater 13 performs a repeater operation. That is, the system control data a2 is transmitted from the relay station 3 to the terminal station 2 at the frequency f2. However, the downlink repeater 13 does not change the data content. Therefore, the contents of the system control data a2 are the same as the system control data a1.

  The terminal station 2 receives one or both of the system control data a1 and a2. That is, when the terminal station 2 is located outside the radio wave shield area 4, the terminal station 2 receives the system control data a 1 from the base station 1. If the terminal station 2 is located in the radio wave shield area 4, the terminal station 2 receives the system control data a <b> 2 from the relay station 3. Further, for example, when the terminal station 2 moves from the outside of the radio wave shield area 4 to the inside, or when the terminal station 2 moves from the inside of the radio wave shield area 4 to the outside, the terminal station 2 receives the system control data. Both a1 and a2 are received. At this time, since the radio frequencies of the system control data a1 and a2 are different from each other, no interference occurs between the system control data a1 and a2. Therefore, the terminal station 2 is located not only when it is located outside the radio wave shield area 4 and when it is located within the radio wave shield area 4 but also near the boundary of the radio wave shield area 4. Even when the system control data is present, at least one of the system control data a1 and a2 can be reliably received. That is, for example, even when the terminal station 2 is moving in the vicinity of the boundary of the radio wave shield area 4, data communication between the base station 1 and the terminal station 2 is not interrupted.

  The terminal station 2 transmits the transmission reservation data f to the base station 1 before transmitting the main body data h to the base station 1. At this time, the terminal station 2 transmits the transmission reservation data f using, for example, a time slot previously assigned to the terminal station 2. When the base station 1 receives the transmission reservation data f, the base station 1 determines a time slot (terminal station slot) to be allocated to the terminal station 2, and notifies the terminal station 2 of the terminal station slot using the transmission permission data d. . Then, the terminal station 2 transmits the main body data h using the notified terminal station slot. After receiving the main body data h, the base station 1 returns the reception confirmation data e.

  The terminal station 2 uses the frequency f1 or the frequency f2 when transmitting uplink data (transmission reservation data f, position data g, main body data h). That is, when the terminal station 2 receives the system control data a1 from the base station 1, the terminal station 2 transmits uplink data at the frequency f1. When the terminal station 2 receives the system control data a2 from the relay station 3, the terminal station 2 transmits uplink data at the frequency f2. Further, when the terminal station 2 receives both the system control data a1 and a2, the terminal station 2 selects one system control data according to an algorithm described later, and transmits uplink data at a frequency corresponding to the selected system control data. To do. Note that the terminal station 2 transmits uplink data in the same time slot (that is, the terminal station slot permitted by the base station 1) regardless of which frequency is used. When the transmission power is designated by the system control data, the terminal station 2 may transmit the uplink data with the designated transmission power.

  Thus, in the radio communication system of the embodiment, the radio frequency for the base station 1 to transmit downlink data and the radio frequency for the relay station 3 to transmit downlink data are different from each other. For this reason, when the terminal station 2 moves between the notification area of the base station 1 and the notification area of the relay station 3, it receives both downlink data transmitted from the base station 1 and the relay station 3. be able to. Therefore, even when the terminal station 2 moves between the notification area of the base station 1 and the notification area of the relay station 3, reception interruption or reception omission of downlink data is suppressed.

  Further, the data communication between the base station 1 and the terminal station 2 uses the same time slot as when not passing through the relay station 3 even when passing through the relay station 3. That is, even when downlink data or uplink data is relayed by the relay station 3, it is not necessary to prepare a new time slot. Therefore, the remaining time slots can be allocated to other terminal stations, and communication resources can be used effectively, so that the number of terminal stations that can be accommodated in the wireless communication system can be increased.

  The wireless communication system of the embodiment may be configured to include a plurality of base stations, a plurality of relay stations, and a plurality of terminal stations. FIG. 9 shows a time chart of data transfer in a system having a plurality of base stations, relay stations, and terminal stations. In addition, when accommodating more terminal stations than the number of terminal station slots provided by the wireless communication system, for example, priority is given to each terminal station. The terminal station with a low priority is controlled to transmit the position data only once for a plurality of cycles.

  FIG. 10 is a diagram illustrating an example of the configuration of the relay station 3. In FIG. 10, the duplexer 15 guides the downlink signal received through the external antenna to the downlink repeater 13 and guides the uplink signal output from the uplink repeater 14 to the external antenna. Similarly, the duplexer 16 guides the downlink signal output from the downlink repeater 13 to the internal antenna, and guides the uplink signal received via the internal antenna to the uplink repeater 14. Note that transmission / reception switching of the duplexers 15 and 16 is controlled by the control unit 12. Further, the duplexers 15 and 16 can be replaced by other switches.

  The downlink repeater 13 includes a reception amplifier 13a, a filter 13b, an oscillator 13c, a mixer 13d, an oscillator 13e, a mixer 13f, a filter 13g, and a transmission amplifier 13h. Note that the radio frequency of the downlink signal input to the downlink repeater 13 is f1.

  The reception amplifier 13a amplifies the input downlink signal. The reception amplifier 13a operates with, for example, AGC or ALC. The filter 13b removes noise from the downlink signal amplified by the reception amplifier 13a. The oscillator 13c outputs an oscillation signal for converting the downlink signal to the intermediate frequency region. The mixer 13d multiplies the downlink signal output from the filter 13b by the oscillation signal output from the oscillator 13c.

  The oscillator 13e outputs an oscillation signal for converting the frequency of the downlink signal to f2. Here, the oscillation frequencies of the oscillators 13c and 13e are different from each other. In one embodiment, the difference in oscillation frequency between the oscillators 13c and 13e corresponds to the difference between f1 and f2. The mixer 13f multiplies the downlink signal in the intermediate frequency region by the oscillation signal output from the oscillator 13e. As a result, the frequency of the downlink signal is f2.

  The filter 13g removes the noise of the downlink signal output from the mixer 13f. The transmission amplifier 13h amplifies the downlink signal output from the filter 13g. The gain of the transmission amplifier 13h is controlled by the control unit 12. In this way, the downlink repeater 13 converts the radio frequency of the downlink signal input via the external antenna from f1 to f2 and guides it to the internal antenna.

  The uplink repeater 14 includes a reception amplifier 14a, a filter 14b, an oscillator 14c, a mixer 14d, an oscillator 14e, a mixer 14f, a filter 14g, and a transmission amplifier 14h. Note that the radio frequency of the uplink signal input to the downlink repeater 14 is f2.

  The operation of the uplink repeater 14 is basically the same as that of the downlink repeater 13 described above. That is, the uplink repeater 14 converts the radio frequency of the uplink signal input via the internal antenna from f2 to f1 and guides it to the external antenna.

  The receiving unit 11 demodulates the downlink signal input via the external antenna. In this example, the receiving unit 11 demodulates the downlink signal converted into the intermediate frequency domain by the downlink repeater 13. Then, the downlink signal demodulated by the receiving unit 11 is input to the control unit 12.

  The controller 12 decodes the downlink signal and reproduces the downlink data. Here, as described with reference to FIGS. 6 to 8, the control unit 12 creates a time chart representing allocation of time slots of the wireless communication system of the embodiment by interpreting downlink data. Can do. That is, the control unit 12 can detect the base station slot based on, for example, the base station slot number of the system control data that is one of the downlink signals. Further, the control unit 12 can detect a terminal station slot allocated to each terminal station by interpreting transmission permission data that is one of downlink signals, for example.

  The control unit 12 controls the operations of the downlink repeater 13 and the uplink repeater 14 according to the created time chart. For example, the control unit 12 operates the downlink repeater 13 and stops the uplink repeater 14 in the base station time slot, and stops the downlink repeater 13 and stops the uplink repeater 14 in the terminal station time slot. Make it work. Note that, during a period that is neither the base station slot nor the terminal station slot, the control unit 12 may stop both the downlink repeater 13 and the uplink repeater 14 or operate only the downlink repeater 13, for example. You may do it. Note that “stop” includes a standby state.

  FIG. 11 is a diagram illustrating another example of the configuration of the relay station 3. In the configuration shown in FIG. 11, the radio frequency is converted between f1 and f2 without using an intermediate frequency. That is, a frequency shift is performed between f1 and f2.

  The downlink repeater 13 includes an oscillator 13i and a mixer 13j, converts the radio frequency of the downlink signal input via the external antenna from f1 to f2, and guides it to the internal antenna. Similarly, the uplink repeater 14 includes an oscillator 14i and a mixer 14j, converts the radio frequency of the uplink signal input via the internal antenna from f2 to f1, and guides it to the external antenna.

  Furthermore, in the configuration shown in FIG. 11, the relay station 3 includes an oscillator 17a and a mixer 17b. The oscillator 17a outputs an oscillation signal for converting the frequency of the downlink signal into an intermediate frequency region or a baseband region. The mixer 17b multiplies the downlink signal output from the filter 13b by the oscillation signal output from the oscillator 17b. Then, the reception unit 11 demodulates the downlink signal output from the mixer 17b. The operation of the control unit 12 is as described above.

  Thus, the configuration shown in FIG. 11 is simpler in circuit configuration than the configuration shown in FIG. Therefore, according to the configuration shown in FIG. 11, the cost of the relay station 3 can be reduced.

FIG. 12 is a flowchart showing the operation of the relay station 3. In this flowchart, operations that are not directly related to data relay are omitted.
In step S1, the control unit 12 sets the downlink repeater 13 to the valid state in order to wait for a downlink signal (here, system control data) from the base station 1. Thereby, the downlink repeater 13 starts operation. At this time, the uplink repeater 14 is preferably stopped.

  In step S2, the reception unit 11 and the control unit 12 start a radio signal reception operation. That is, the receiving unit 11 demodulates the received downlink signal. In addition, the control unit 12 decodes and interprets the demodulated downlink signal.

  In step S3, the control unit 12 waits for system control data. That is, the control unit 12 checks whether the received data is system control data. At this time, the data type ID of the received data is referred to. And control part 12 will perform Steps S4-S5, if system control data is received.

  In step S4, the control part 12 produces | generates the time chart of a radio | wireless communications system based on system control data. That is, the control unit 12 detects a base station slot (downlink period) and a terminal station slot (uplink period). When the terminal station slot is notified by the transmission permission data from the base station 1 to the terminal station 2, the control unit 12 detects the base station slot and the terminal station slot based on the system control data and the transmission permission data. You may make it do.

  In step S5, the control unit 12 controls the downlink repeater 13 and the uplink repeater 14 according to the generated time chart. At this time, for example, as described above, the control unit 12 operates the downlink repeater 13 and stops the uplink repeater 14 in the base station time slot, and stops the downlink repeater 13 in the terminal station time slot. And the uplink repeater 14 is operated. Thereby, the downlink signal is transmitted to the terminal station 2 by the downlink repeater 13, and the uplink signal is transmitted to the base station 1 by the uplink repeater 14.

  Thus, in the relay station 3 of the embodiment, the downlink repeater 13 and the uplink repeater 14 do not operate simultaneously. Therefore, oscillation in the relay station 3 can be prevented. Further, in a configuration in which the downlink repeater 13 operates only during the downlink period and the uplink repeater 14 operates only during the uplink period, the power consumption of the relay station 3 can be suppressed. Furthermore, since unnecessary transmission radio waves are reduced, interference with radio waves transmitted from other terminal stations / relay stations is also suppressed.

FIG. 13 is a diagram illustrating an example of the configuration of the terminal station 2. In FIG. 13, the GPS receiving unit 23 is omitted.
The duplexer 28 guides the downlink signal received via the antenna to the reception unit 25 and guides the uplink signal output from the transmission unit 27 to the antenna. Note that transmission / reception switching of the duplexer 28 is controlled by the control unit 24. Further, the duplexer 28 can be replaced by another switch.

  The receiving unit 25 includes a receiving amplifier 25a, a filter 25b, an oscillator 25c, a mixer 25d, and a demodulator 25e. As shown in FIG. 3, when the terminal station 2 is located outside the radio wave shield area 4, a downlink signal having a frequency f <b> 1 is input to the receiving unit 25. As shown in FIG. 4, when the terminal station 2 is located in the radio wave shield area 4, a downlink signal having a frequency f <b> 2 is input to the receiving unit 25. Further, as shown in FIG. 5, when the terminal station 2 is located in the vicinity of the boundary of the radio wave shield region 4, the downlink signal of the frequency f1 and the downlink signal of the frequency f2 are input to the receiving unit 25. The

  The reception amplifier 25a amplifies the input downlink signal. The reception amplifier 25a operates by AGC or ALC, for example. The filter 25b removes noise from the downlink signal amplified by the reception amplifier 25a. The filter 25b is realized by, for example, a band filter that passes the frequency f1. The oscillator 25c outputs an oscillation signal for converting the downlink signal having the frequency f1 into the intermediate frequency region or the baseband region. The mixer 25d multiplies the downlink signal having the frequency f1 output from the filter 25b by the oscillation signal output from the oscillator 25c. The demodulator 25e demodulates the downlink signal output from the mixer 25d.

  Thus, the receiving unit 25 demodulates the downlink signal having the frequency f1. That is, the receiving unit 25 demodulates the downlink signal received from the base station 1. The received data 1 obtained by the receiving unit 25 is input to the control unit 24.

  The receiving unit 26 includes a filter 26b, an oscillator 26c, a mixer 26d, and a demodulator 26e. In the example shown in FIG. 13, the downlink signal amplified by the reception amplifier 25a is input to the reception unit 26.

  The operation of the receiving unit 26 is basically the same as that of the receiving unit 25 described above. However, the receiving unit 26 demodulates the downlink signal having the frequency f2. That is, the receiving unit 26 demodulates the downlink signal received from the relay station 3. The received data 2 obtained by the receiving unit 26 is input to the control unit 24.

  In the example illustrated in FIG. 13, the downlink signal amplified by the reception amplifier 25 a is input to the reception unit 26. However, the downlink signal output from the duplexer 28 may be guided to the reception unit 26. Good. In this case, the receiving unit 26 includes a receiving amplifier 26a. The reception amplifier 26a amplifies the downlink signal output from the duplexer 28 and guides it to the filter 26b.

  The control unit 24 decodes the downlink signal received from the base station 1 and / or the relay station 3 and interprets the downlink data. Then, the control unit 24 outputs uplink data using a time slot assigned in advance to the terminal station 2 or a terminal station slot assigned by the base station 1. Further, the control unit 24 determines an uplink signal transmission destination according to the procedure shown in FIG. 14 or FIG. 15, and generates a frequency switching signal indicating a radio frequency corresponding to the transmission destination. When the uplink signal transmission destination is the base station 1, the frequency f1 is specified, and when the uplink signal transmission destination is the relay station 3, the frequency f2 is specified.

  The transmission unit 27 includes a modulation unit 27a, an oscillator 27b, a mixer 27c, a filter 27d, and a transmission amplifier 27e. The modulator 27a modulates transmission data (that is, uplink data) generated by the control unit 24 to generate an uplink signal. The oscillator 27b outputs an oscillation signal corresponding to the frequency indicated by the frequency switching signal generated by the control unit 24. The mixer 27c multiplies the uplink signal output from the modulator 27a by the oscillation signal output from the oscillator 27b.

  The filter 27d removes the noise of the uplink signal output from the mixer 27c. At this time, the pass frequency of the filter 27d is controlled according to the frequency switching signal. For example, the filter 27d is controlled to extract the f1 component when the transmission destination of the uplink signal is the base station 1, and extracts the f2 component when the transmission destination of the uplink signal is the relay station 3. Controlled. The transmission amplifier 27e amplifies the uplink signal filtered by the filter 27d. The gain of the transmission amplifier 27e is controlled by the control unit 24 according to the destination of the uplink signal, for example.

  FIG. 14 is a flowchart showing the operation of the terminal station 2. In this flowchart, operations not directly related to data transmission / reception are omitted. In the following description, the terminal station 2 is assumed to have the configuration shown in FIG.

  In step S11, a reception operation is started. That is, the receiving units 25 and 26 and the control unit 24 start demodulation and decoding of the received downlink signal. In step S12, the control unit 24 checks whether or not the received data is system control data. At this time, the data type ID of the received data is referred to. If the received data is system control data, the control unit 24 checks whether or not the transmission source of the system control data is the base station 1 in step S13.

  When receiving the received data 1 from the receiving unit 25, the control unit 24 determines that the system control data has been received from the base station 1. If the transmission source of the system control data is the base station 1, step S14 is executed. If the transmission source of the system control data is not the base station 1, step S18 is executed.

  In step S14, the control unit 24 stores the system control data (base station data) received from the base station 1. Subsequently, in step S15, the control unit 24 checks whether or not system control data has been received from the relay station 3. At this time, when receiving the reception data 2 from the reception unit 26, the control unit 24 determines that the system control data is received from the relay station 3. If it is determined in step S15 that the system control data is not received from the relay station 3, that is, if the system control data is received only from the base station 1, the control unit 24, in step S16, Various terminal processing related to the communication mode is executed. The terminal processing in step S16 includes a procedure for generating a time chart of the wireless communication system based on the downlink data received from the base station 1.

  In step S <b> 17, the control unit 24 outputs uplink data using the terminal station slot assigned by the base station 1. In addition, the control unit 24 generates a frequency switching signal that indicates the frequency f <b> 1 and supplies the frequency switching signal to the transmission unit 27. As a result, uplink data is transmitted to the base station 1 using the carrier slot of the frequency f1 using the terminal station slot. It is assumed that the terminal station 2 is previously notified of the terminal station slot by transmission permission data from the base station 1.

  When the transmission source of the system control data is not the base station 1 but the relay station 3 (step S13: No), the control unit 24 receives the system control data (relay station data) received from the relay station 3 in step S18. save. In step S19, the control unit 24 executes various terminal processing related to the relay station communication mode. The terminal station processing in step S19 includes a procedure for generating a time chart of the wireless communication system based on the downlink data received from the relay station 3.

  In step S20, the control unit 24 outputs uplink data using the terminal station slot allocated by the base station 1. In addition, the control unit 24 generates a frequency switching signal that indicates the frequency f <b> 2 and supplies the frequency switching signal to the transmission unit 27. As a result, uplink data is transmitted to the relay station 3 using the terminal station slot and the carrier wave having the frequency f2.

  When system control data is received from both the base station 1 and the relay station 3 (step S15: Yes), the control unit 24 checks the reception state of the GPS radio wave in the GPS reception unit 23 in steps S21 to S22. Here, the GPS receiving unit 23 constantly detects GPS radio waves transmitted from the GPS satellite 5.

  In order to check the state of the GPS radio wave, for example, accuracy information (PDOP or the like) of coordinate information from the GPS receiver 23 is used. When the accuracy information is smaller than the threshold value, the control unit 24 determines that the terminal station 2 is located outside the radio wave shield area 4 and can directly transmit and receive radio signals to and from the base station 1. In this case, the control unit 24 executes Steps S16 to S17 and transmits uplink data to the base station 1 at the frequency f1. On the other hand, when the accuracy information (PDOP or the like) of the coordinate information from the GPS receiving unit 23 is larger than the threshold value, the control unit 24 determines that it is difficult to directly transmit / receive a radio signal to / from the base station 1. In this case, the control unit 24 executes steps S19 to S20 and transmits uplink data to the relay station 3 at the frequency f2.

  Thus, the terminal station 2 determines the frequency (or uplink data transmission destination) for transmitting the uplink data based on the transmission source of the downlink data. Further, when the terminal station 2 receives downlink data from both the base station 1 and the relay station 3, the terminal station 2 transmits the uplink data according to the reception state of the GPS radio wave in the GPS receiving unit 23 ( Alternatively, the uplink data transmission destination) is determined.

FIG. 15 is a flowchart showing another embodiment of the operation of the terminal station 2. In the method shown in this flowchart, steps S31 to S33 are executed in addition to the procedure shown in FIG.
Step S31 is executed next to step S14. In step S31, the control unit 24 detects the reception intensity of the base station radio wave. Information indicating the reception intensity of the base station radio wave is stored in a predetermined memory area. When system control data is received from both the base station 1 and the relay station 3 (step S15: Yes), the control unit 24 detects the reception intensity of the relay station radio wave in step S32. Information indicating the reception intensity of the relay station radio wave is also stored in a predetermined memory area.

  When the system control data is received from both the base station 1 and the relay station 3 and the reception level of the GPS radio wave is good (step S22: Yes), the control unit 24, in step S33, Calculate the ratio of radio wave and relay station radio wave reception intensity. If the reception intensity Pb of the base station radio wave is higher than the reception intensity Pr of the relay station radio wave, and the ratio R (= Pb / Pr) of the reception radio wave intensity exceeds the threshold Cth, steps S16 to S17 are executed. Is done. On the other hand, if the above ratio R is equal to or less than the threshold value Cth, steps S19 to S20 are executed.

  As described above, in the procedure shown in FIG. 15, the frequency for transmitting the uplink data is determined by referring to the reception level of the base station radio wave and the relay station radio wave in addition to the reception level of the GPS radio wave. Although not shown in particular, the terminal station 2 may determine the frequency for transmitting the uplink data based on the reception level of the base station radio wave and the relay station radio wave without referring to the reception state of the GPS radio wave. Good. In this case, steps S21 and S22 may be deleted and step S33 may be executed after step S32 in the flowchart shown in FIG.

  The terminal station 2 may select the transmission frequency without recognizing the transmission source of the downlink data. For example, in the case shown in FIG. 5, when the terminal station 2 receives two system control data signals, the terminal station 2 is based on the reception state of GPS radio waves and / or received radio field strengths of the two system control data signals. Based on this, one system control data may be selected.

  FIG. 16 is a diagram illustrating a modification of the relay station 3 used in the wireless communication system illustrated in FIGS. In addition to the configuration shown in FIG. 2, this relay station includes received radio wave intensity monitoring units 18 and 19.

  The received radio wave intensity monitoring unit 18 monitors the intensity of the received radio wave having the frequency f2 received via the internal antenna and notifies the control unit 12 of the intensity. If the intensity of the received radio wave having the frequency f2 is higher than a predetermined threshold level, the control unit 12 determines that the terminal station 2 is transmitting uplink data to the relay station 3, and the uplink repeater 14 is turned on. To control. On the other hand, if the intensity of the received radio wave having the frequency f2 is equal to or lower than the predetermined threshold level, the control unit 12 determines that the terminal station 2 is not transmitting uplink data to the relay station 3, and sets the uplink repeater 14 Control to OFF state.

  Similarly, the received radio wave intensity monitoring unit 19 monitors the intensity of the received radio wave having the frequency f1 received via the external antenna and notifies the control unit 12 of the intensity. If the intensity of the received radio wave at frequency f1 is higher than a predetermined threshold level, the control unit 12 determines that the base station 1 is transmitting downlink data, and controls the downlink repeater 13 to be in an ON state. On the other hand, if the intensity of the received radio wave having the frequency f1 is equal to or lower than a predetermined threshold level, the control unit 12 determines that the base station 1 is not transmitting downlink data and controls the downlink repeater 13 to be in an OFF state. .

  Therefore, according to the configuration shown in FIG. 16, the corresponding downlink repeater 13 or uplink repeater 14 operates only when radio waves are received from the base station 1 or the terminal station 2. The power is reduced and the transmission of interfering radio waves can be reduced. The control unit 12 preferably controls so that the downlink repeater 13 and the uplink repeater 14 are not turned on at the same time.

  FIG. 17 is a diagram illustrating another modification of the relay station 3 used in the wireless communication system illustrated in FIGS. This relay station includes a receiving unit 11, a control unit 12, transmission / reception switching units 41 and 42, a repeater 43, and a received radio wave intensity monitoring unit 44.

  The transmission / reception switching units 41 and 42 switch transmission / reception in accordance with a switching instruction generated by the control unit 12. That is, the transmission / reception switching unit 41 guides the downlink signal received via the external antenna to the repeater 43 in the downlink period (including the base station slot), and in the uplink period (including the terminal station slot). The uplink signal output from the repeater 43 is guided to the external antenna. The transmission / reception switching unit 42 guides the downlink signal output from the repeater 43 to the internal antenna in the downlink period, and guides the uplink signal received through the internal antenna to the repeater 43 in the uplink period. .

  The repeater 43 performs frequency conversion of the downlink signal or the uplink signal according to the switching instruction generated by the control unit 12. That is, the repeater 43 converts the frequency of the downlink signal received via the external antenna from f1 to f2 during the downlink period, and the frequency of the uplink signal received via the internal antenna during the uplink period. Is converted from f2 to f1.

  The reception radio wave intensity monitor unit 44 monitors the intensity of the signal guided from the transmission / reception switching units 41 and 42. Therefore, the received radio wave strength monitor unit 44 monitors the strength of the downlink signal received via the external antenna during the downlink period, and the strength of the uplink signal received via the internal antenna during the uplink period. To monitor.

  In the relay station configured as described above, the repeater 43 is shared for relaying the downlink and the uplink. Therefore, according to this embodiment, the configuration of the relay station is simplified.

  Next, an application system implemented using the wireless communication system of the embodiment will be described. The wireless communication system of the embodiment is not particularly limited. For example, the base station 1 collects information (position data g and main body data h in FIG. 6) transmitted from each terminal station and collects the information. Transfer to the host computer via the controller. The host computer executes an application for accumulating and analyzing data transferred from the base station 1. Below, the example which performs the simulated battle training using the radio | wireless communications system of embodiment is demonstrated.

  In the simulated battle training, each combatant carries the terminal station 2. Further, as shown in FIG. 2, a light receiver (PD) 33 and a firearm interface (I / F) 34 are connected to each terminal station 2. The light receiver 33 is attached to a predetermined location (for example, head, back, arms, legs, etc.) by a jacket or a belt worn by a combatant. The light receiver 33 detects a laser beam output from a laser gun as a pseudo firearm. When the light receiver 33 detects the laser beam, the control unit 24 determines that the combatant is “shot”. The firearm interface 34 is connected to a laser gun. And if a combatant uses a laser gun, the control part 24 will judge that the combatant used the firearm.

  The terminal station 2 notifies the base station 1 of the position of the combatant, the worn state of the combatant, and the like. For example, the position of the combatant is notified to the base station 1 using the position data g shown in FIG. 6 based on the coordinate information from the GPS receiver 23. Information representing the wearer's wear state is created based on input signals from the light receiver 33 and the firearm interface 34, and is notified to the base station 1 using the main body data h shown in FIG.

  The base station 1 collects information transmitted from each terminal station 2 and transmits the information to the host computer via the collection control device. The host computer organizes and accumulates the collected information. The host computer reviews the strategy, deployment, and battle status based on the accumulated information to improve the accuracy of battle training.

  The number of base stations included in the wireless communication system is determined according to the size of the training area, the state of radio wave notification, and the like so that the radio waves reach the entire training area. The number of fighters participating in the training is, for example, tens to thousands. In the training, a battle vehicle and a building for indoor battle training are used. Some of these battle vehicles and buildings do not receive radio waves from the base station 1 or the GPS satellite 5. That is, these battle vehicles and buildings correspond to the radio wave shield area 4.

  A relay station 3 is installed in each battle vehicle and building. Moreover, you may install the terminal station 2 in each battle vehicle and a building. In this case, the terminal station 2 notifies the base station 1 of the position of the battle vehicle, the status of the battle vehicle, and the building (normal, minor damage, major damage, etc.). Thereby, the situation of the simulated battle can be confirmed more accurately.

  In this training system, dozens to thousands of terminal stations are accommodated for several base stations. That is, a one-to-many wireless data communication system is constructed. In addition, real-time performance is required for the entire system. For this reason, downlink data from each base station to a terminal station is basically broadcast to all terminal stations in the radio area. At this time, an instruction of an operation mode, an instruction of a transmission cycle of position data, etc. are notified by downlink data (for example, system control data a or control data c shown in FIG. 6) from the base station to each terminal station. . In addition, the downlink data can also transmit information such as the position where the shell is dropped and the burst height.

  The terminal station may determine the damage status of the combatant carrying the terminal station based on the position of the station, the defense status (such as inside the armored vehicle), and the like. Laser beams are used in a simulated battle between a vehicle and a combatant, or a simulated battle between combatants. At this time, for example, when a laser beam is incident on the light receiver 33 connected to the terminal station 2 and the wearer's wear state changes, the state change is automatically transmitted to the base station 1 as uplink data. Then, the host computer grasps the position and state of each combatant based on the uplink data from each terminal station, and accurately recognizes the training situation.

  The wireless communication system of the embodiment can be used for various applications other than the above-described simulated battle training. For example, in the health management system, each member can carry the terminal 2 and collect and manage physical information (heart rate, blood pressure, body temperature, etc.) of each member. In addition, it can be applied to a play progress confirmation system in a golf course, an individual position confirmation system in an adventure game, and a child or elderly person's lost child countermeasure.

  FIG. 18 is a diagram illustrating a configuration of a wireless communication system according to another embodiment. In the configuration shown in FIG. 18, a terminal station 6 (hereinafter, vehicle terminal station 6) is provided in a vehicle or a building as the radio wave shield region 4. The vehicle terminal station 6 can directly transmit and receive radio signals to and from the base station 1.

  Similarly to the terminal station 2, the vehicle terminal station 6 includes reception units 25 and 26, a transmission unit 27, a GPS reception unit 23, and a control unit 24. Further, a firearm interface (I / F) 34 and a light emitter (LD) 35 are connected to the vehicle terminal station 6 through a connection box 32.

  The light emitter 35 includes, for example, a laser light source or an infrared light source, and outputs an optical signal that transmits data received from the base station 1 and data generated by the control unit 24 of the vehicle terminal station 6. The wavelength of the output light of the light emitter 35 is not particularly limited, but is detected by the light receiver 33 of the terminal station 2. Thus, the vehicle terminal station 6 can transmit desired data to the terminal station 2 using the light emitter 35.

  For example, the vehicle terminal station 6 can notify the terminal station 2 of an instruction to transmit uplink data using the relay station 3. In this case, the terminal station 2 transmits uplink data using the frequency f2. According to this configuration, the terminal station 2 can switch between communicating directly with the base station 1 and communicating with the relay station 3 in accordance with an instruction from the vehicle terminal station 6. Further, when the vehicle terminal station 6 causes the terminal station 2 to communicate with the relay station 3, the vehicle terminal station 6 can notify the terminal station 2 of information indicating a transmission power that is small enough to reach the relay station 3. . Furthermore, in the simulated battle training described above, the vehicle terminal station 6 may notify the base station 1 and the terminal station 2 of the wear state of the vehicle, for example. In this case, the terminal station 2 updates corresponding information according to the notified wear state.

  FIG. 19 is a diagram illustrating a configuration of a wireless communication system according to still another embodiment. In this embodiment, a building 4A that shields radio waves includes a building relay station 3A, and a vehicle 4B that shields radio waves includes a vehicle relay station 3B. In the example shown in FIG. 19, the vehicle 4B is located in the building 4A, and the terminal station 2d is located in the vehicle 4B.

  The configuration and operation of the building relay station 3A are basically the same as those of the relay station 3 described above. That is, the building relay station 3A transmits the downlink signal received from the base station 1 into the building 4A, and the uplink signal transmitted from the vehicle relay station 3B or the terminal station 2d located in the building 4A. Send out of 4A. At this time, the building relay station 3A converts the radio frequency between f1 and f2.

  The vehicle relay station 3B has a function of converting a radio frequency between f1 and f2, and a function of converting a radio frequency between f2 and f3. In order to realize these functions, the vehicle relay station 3B includes duplexers 51 and 52, receiving units 53-1 and 53-2, a control unit 54, downlink repeaters 55-1 and 55-2, and an uplink. Repeaters 56-1 and 56-2 are provided.

  The duplexer 51 guides the downlink signal of the frequency f1 received via the external antenna to the reception unit 53-1 and the downlink repeater 55-1, and receives the downlink signal of the frequency f2 received via the external antenna, It guides to the receiving part 53-2 and the downlink repeater 55-2. The duplexer 51 guides the uplink signals of the frequencies f1 and f2 output from the uplink repeaters 56-1 and 56-2 to the external antenna. On the other hand, the duplexer 52 guides the uplink signals of the frequencies f2 and f3 received via the internal antenna to the uplink repeaters 56-1 and 56-2, and is output from the downlink repeaters 55-1 and 55-2. Downlink signals having frequencies f2 and f3 are guided to an external antenna.

  The receiving unit 53-1 demodulates the downlink signal having the frequency f1 transmitted from the base station 1, and the receiving unit 53-2 demodulates the downlink signal having the frequency f2 transmitted from the building relay station 3A. The downlink signal demodulated by the receiving units 53-1 and 53-2 is input to the control unit 54.

  The control unit 54 generates a time chart of the wireless communication system based on the received downlink signal, similarly to the control unit 12 of the relay station 3 illustrated in FIG. That is, the control unit 54 detects a downlink period (including a base station slot) and an uplink period (including a terminal station slot). Then, the control unit 54 controls the downlink repeaters 55-1 and 55-2 and the uplink repeaters 56-1 and 56-2 according to the detected downlink period and uplink period. Further, the control unit 54 can notify the reception frequency information to the terminal station 2d using the light emitter (LD) 57.

  The downlink repeater 55-1 converts the frequency of the downlink signal from f1 to f2. Similarly, the downlink repeater 55-2 converts the frequency of the downlink signal from f2 to f3. On the other hand, the uplink repeater 56-1 converts the frequency of the uplink signal from f2 to f1. Similarly, the uplink repeater 56-2 converts the frequency of the uplink signal from f3 to f2.

  The terminal station 2d includes a reception unit (f2) 26, a reception unit (f1, f3) 29, a transmission unit 27, a GPS reception unit 23, and a control unit 24. As described above, the receiving unit 26 demodulates the downlink signal having the frequency f2. That is, the receiving unit 26 demodulates the downlink signal having the frequency f2 transmitted from the building relay station 3A or the vehicle relay station 3B. Further, the transmission unit 27 transmits uplink data at the frequency f2 in accordance with an instruction from the control unit 24.

  In response to an instruction from the control unit 24, the reception unit 29 performs a reception operation at either the frequency f1 or the frequency f3. That is, when the frequency f1 is instructed, the receiving unit 29 demodulates the downlink signal having the frequency f1 transmitted from the base station 1, and the transmitting unit 27 transmits uplink data at the frequency f1. In addition, when the frequency f3 is instructed, the reception unit 29 demodulates the downlink signal of the frequency f3 transmitted from the vehicle relay station 3B, and the transmission unit 27 transmits uplink data at the frequency f3.

  In the wireless communication system having the above configuration, when the vehicle relay station 3B is located outside the building 4A, the vehicle relay station 3B transmits and receives radio signals to and from the base station 1 at the frequency f1. FIG. 19 shows a state where the vehicle relay station 3B is located inside the building 4A, and a state where the vehicle relay station 3B is located outside the building 4A is not shown.

  When the vehicle relay station 3B is located outside the building 4A, the downlink repeater 55-1 of the vehicle relay station 3B converts the radio frequency of the downlink signal from f1 to f2. The downlink signal having the frequency f2 obtained by the downlink repeater 55-1 is transmitted from the vehicle relay station 3B to the terminal station 2d located in the vehicle 4B. Further, the vehicle relay station 3B uses the light emitter 57 to transmit reception frequency information indicating the frequency f1 to the terminal station 2d. Note that the vehicle relay station 3B periodically transmits reception frequency information indicating the frequency f1, for example, during a period in which the radio signal from the base station 1 is received. Further, when the vehicle relay station 3B cannot receive the radio signal from the base station 1, the vehicle relay station 3B transmits reception frequency information indicating the frequency f3.

  When receiving the reception frequency information indicating the frequency f1, the control unit 24 of the terminal station 2d causes the reception unit 29 to operate in a mode for receiving a signal of the frequency f1. That is, the terminal station 2d operates in a mode in which signals can be transmitted and received at the frequencies f1 and f2. Therefore, when the terminal station 2d is located in the vehicle 4B, the terminal station 2d receives the downlink signal of the frequency f2 from the vehicle relay station 3B, and when the terminal station 2d moves out of the vehicle 4B, d2 receives a downlink signal of frequency f1 from the base station 1. Further, when the terminal station 2d moves out of the vehicle 4B or from the outside of the vehicle 4B, the terminal station 2d transmits downlink signals having different frequencies from the base station 1 and the vehicle relay station 3B. Receive. In this case, for example, data is reproduced from one of the downlink signals according to the procedure of the flowchart shown in FIG. 14 or FIG. Therefore, data communication between the base station 1 and the terminal station 2d is not interrupted.

  When the terminal station 2d receives the downlink signal having the frequency f2 from the vehicle relay station 3B, the terminal station 2d transmits the uplink signal using the frequency f2. The uplink signal is transmitted to the base station 1 after being converted into the frequency f1 by the uplink repeater 56-1 in the vehicle relay station 3B. On the other hand, when the terminal station 2d receives the downlink signal having the frequency f1 from the base station 1, the terminal station 2d transmits the uplink signal to the base station 1 at the frequency f1.

  When the vehicle relay station 3B is located in the vicinity of the entrance of the building 4A, the vehicle relay station 3B has a downlink signal of the frequency f1 transmitted from the base station 1 and a frequency f2 transmitted from the building relay station 3A. Downlink signal arrives. In this case, the downlink repeater 55-1 converts the radio frequency of the downlink signal received from the base station 1 from f1 to f2. Further, the downlink repeater 55-2 converts the radio frequency of the downlink signal received from the building relay station 3A from f2 to f3. And the downlink signal of frequency f2, f3 is transmitted to the terminal station 2d located in the vehicle 4B from the vehicle relay station 3B.

  Downlink signals having frequencies f2 and f3 arrive at the terminal station 2d. Then, the terminal station 2d receives the downlink signal of the frequency f2 using the receiving unit 26. That is, the terminal station 2d can receive the downlink signal regardless of the operation mode of the receiving unit 29.

  When the terminal station 2d receives the downlink signal having the frequency f2, the terminal station 2d transmits the uplink signal using the frequency f2. This uplink signal is frequency-converted to f1 by the uplink repeater 56-1 of the vehicle relay station 3B, and then transmitted to the base station 1.

  When the vehicle relay station 3B is located in the building 4A, the downlink signal of the frequency f1 transmitted from the base station 1 does not reach the vehicle relay station 3B, and is transmitted from the building relay station 3A. Only the downlink signal of frequency f2 arrives. In this case, the downlink repeater 55-2 of the vehicle relay station 3B converts the radio frequency of the downlink signal from f2 to f3. Then, the downlink signal having the frequency f3 is transmitted from the vehicle relay station 3B to the terminal station 2d located in the vehicle 4B. Further, since the vehicle relay station 3B cannot receive the radio signal from the base station 1, the vehicle relay station 3B periodically transmits reception frequency information indicating the frequency f3 to the terminal station 2d using the light emitter 57.

  When receiving the reception frequency information indicating the frequency f3, the control unit 24 of the terminal station 2d operates the reception unit 29 in a mode for receiving a signal of the frequency f3. That is, the terminal station 2d operates in a mode in which signals can be received at the frequencies f2 and f3. Therefore, when the terminal station 2d is located in the vehicle 4B, the terminal station 2d uses the receiving unit 29 to receive the downlink signal having the frequency f3 transmitted from the vehicle relay station 3B. When the terminal station 2d moves outside the vehicle 4B in the building 4A, the terminal station d2 receives the downlink signal of the frequency f2 transmitted from the building relay station 3A using the receiving unit 26. Further, in the building 4A, when the terminal station 2d moves out of the vehicle 4B or out of the vehicle 4B, the terminal station 2d is connected to the building relay station 3A and the vehicle relay station 3B from each other. Receive downlink signals of different frequencies. In this case, for example, data is reproduced from one of the downlink signals based on the received radio wave intensity from the building relay station 3A and the vehicle relay station 3B. Therefore, even when the terminal station 2d (and the vehicle 4B) is located in the building 4A, data communication between the base station 1 and the terminal station 2d is not interrupted.

  If the terminal station 2d moves out of the vehicle 4B, the terminal station 2d cannot receive the reception frequency signal from the vehicle relay station 3B. In this case, the control unit 24 of the terminal station 2d may return the receiving unit 29 to the mode for receiving the signal of the frequency f1. Then, the terminal station 2d shifts to a mode in which signals can be received at the frequencies f1 and f2. In this case, for example, when the terminal station 2d moves out of the vehicle 4B and then moves out of the building 4A, the terminal station 2d directly transmits and receives signals to and from the base station 1 at the frequency f1. it can. That is, even in such a case, data communication between the base station 1 and the terminal station 2d is not interrupted.

  When the vehicle 4B (that is, the vehicle relay station 3B) is located in the building 4A, the terminal station 2d transmits an uplink signal at the frequency f3 when receiving the downlink signal of the frequency f3 from the vehicle relay station 3B. . The uplink signal is converted into the frequency f2 by the uplink repeater 56-2 in the vehicle relay station 3B, and further converted into the frequency f1 in the building relay station 3A, and then transmitted to the base station 1.

  Thus, when the vehicle 4B is located in the building 4A and the terminal station 2d is located in the vehicle 4B, two-stage frequency conversion is performed. However, the processing time required for frequency conversion is short enough to be ignored compared to one time slot. Therefore, the uplink data transmitted from the terminal station 2d using the terminal station slot is received by the base station 1 in the terminal station slot even when passing through the vehicle relay station 3B and the building relay station 3A. Is done.

  FIG. 20 is a diagram showing another embodiment of the relay station (vehicle relay station 3B) used in the system shown in FIG. The relay station receives a downlink signal having a frequency f1 and / or a frequency f2 via an external antenna, and receives a downlink signal having a frequency f2 or a frequency f3 via an internal antenna.

  The receiving unit 61 demodulates a downlink signal input via the external antenna. The band of the reception unit 61 includes frequencies f1 and f2. The digital filter 62 includes, for example, an A / D converter, an FIR filter, and a D / A converter, and extracts a downlink signal having a frequency f1 and / or a downlink signal having a frequency f2. The extracted downlink signals of frequencies f1 and f2 are guided to downlink repeaters 55-1 and 55-2, respectively. The extracted downlink signal is also guided to the control unit 54. Note that the processing time required for A / D conversion, filtering, and D / A conversion is sufficiently shorter than the time slot of the wireless communication system.

  Downlink signals of frequencies f2 and f3 output from the downlink repeaters 55-1 and 55-2 are transmitted to the terminal station 2d via the mixing unit 63 and the internal antenna. For the uplink signal, the receiving unit 64, the digital filter 65, the uplink repeaters 56-1 and 56-2, and the mixing unit 66 perform frequency conversion similar to that for the downlink.

According to the configuration shown in FIG. 20, the RF circuit portion can be simplified. Moreover, according to this structure, it can respond flexibly with respect to the change of a receiving frequency.
FIG. 21 is a diagram showing another embodiment of a terminal station (terminal station 2d) used in the system shown in FIG. The terminal station includes a downlink signal of frequency f1 transmitted from the base station 1, and / or a downlink signal of frequency f2 transmitted from the building relay station 3A or the vehicle relay station 3B, and / or vehicle relay. A downlink signal having a frequency f3 transmitted from the station 3B is input.

  The transmission / reception unit 70 included in the terminal station includes a reception unit 71, a digital filter 72, and a transmission unit 73. The receiving unit 71 demodulates the input downlink signal. The band of the receiving unit 71 includes frequencies f1, f2, and f3.

  The digital filter 72 includes, for example, an A / D converter and an FIR filter, and downlink data obtained from the downlink signal having the frequency f1 and / or downlink data obtained from the downlink signal having the frequency f2 and / or Alternatively, downlink data obtained from the downlink signal of frequency f3 is output. Downlink data obtained by the digital filter is guided to the control unit 24. Note that the processing time required for A / D conversion and filtering is sufficiently shorter than the time slot of the wireless communication system.

  The transmission unit 73 transmits an uplink signal at a frequency corresponding to the received downlink data in accordance with an instruction from the control unit 24. For example, when downlink data of frequency f3 is received and downlink data is reproduced, an uplink signal is transmitted at frequency f3.

  According to the configuration shown in FIG. 21, the RF circuit portion can be simplified. Moreover, according to this structure, it can respond flexibly with respect to the change of a receiving frequency. Furthermore, according to this configuration, when compared with the configuration illustrated in FIG. 19, switching between the frequencies f1 and f3 is unnecessary, and therefore, the possibility of receiving a downlink signal is further reduced. Furthermore, it is not necessary to notify the reception frequency information from the vehicle relay station to the terminal station.

  In the example described with reference to FIGS. 2 to 21, the carrier frequencies of the radio signals transmitted and received by the base station are all f1 and are the same. However, the present invention is not limited to this. That is, the carrier frequency of the downlink signal transmitted from the base station and the uplink signal received by the base station may be different from each other. Similarly, the carrier frequency of the downlink signal transmitted from the relay station to the terminal station and the uplink signal transmitted from the terminal station to the relay station may be different from each other.

The following supplementary notes are further disclosed with respect to the embodiments including the above examples.
(Appendix 1)
A wireless communication method for performing communication in a time division multiplexing method in a wireless communication system in which a relay station is provided between a base station and a terminal station,
The base station transmits downlink data on a first downlink frequency using a base station time slot allocated to the base station;
The relay station transmits downlink data received from the base station on a second downlink frequency different from the first downlink frequency using the base station time slot;
When the terminal station receives the downlink data from the base station, the terminal station transmits uplink data on a first uplink frequency using a terminal station time slot allocated to the terminal station. When the downlink data is received from the relay station, the uplink data is transmitted at a second uplink frequency different from the first uplink frequency using the terminal station time slot,
The relay station transmits the uplink data transmitted from the terminal station on the second uplink frequency using the terminal station time slot on the first uplink frequency. Wireless communication method.
(Appendix 2)
The wireless communication method according to attachment 1, wherein
When the terminal station receives downlink data from the base station and the relay station, the terminal station selects the first or second uplink frequency according to a state of a radio signal for obtaining position information, and A wireless communication method characterized by transmitting uplink data.
(Appendix 3)
The wireless communication method according to appendix 1 or 2,
When the terminal station receives downlink data from the base station and the relay station, the terminal station selects the first or second uplink frequency based on the received radio wave from the base station and the relay station, and A wireless communication method characterized by transmitting uplink data.
(Appendix 4)
The wireless communication method according to attachment 1, wherein
In the base station time slot, the relay station operates a downlink repeater that transmits downlink data from the base station to the terminal station, and transmits uplink data from the terminal station to the base station. Stop the uplink repeater
The wireless communication method, wherein the relay station stops a downlink repeater and operates an uplink repeater from the terminal station in the terminal station time slot.
(Appendix 5)
The wireless communication method according to attachment 1, wherein
The relay station stops a downlink repeater that transmits downlink data from the base station to the terminal station during a period when the received radio wave of the first downlink frequency is lower than a threshold level. Wireless communication method.
(Appendix 6)
The wireless communication method according to attachment 1, wherein
The relay station stops an uplink repeater that transmits uplink data from the terminal station to the base station during a period when the received radio wave of the second uplink frequency is lower than a threshold level. Wireless communication method.
(Appendix 7)
The wireless communication method according to any one of appendices 1 to 6,
The wireless communication method, wherein the first downlink frequency and the first uplink frequency are the same, and the second downlink frequency and the second uplink frequency are the same.
(Appendix 8)
A wireless communication method for performing communication by a time division multiplexing method in a wireless communication system in which first and second relay stations are provided between a base station and a terminal station,
The base station transmits downlink data on a first downlink frequency using a base station time slot allocated to the base station;
The first relay station transmits downlink data received from the base station at a second downlink frequency different from the first downlink frequency using the base station time slot;
The second relay station receives downlink data received from the first relay station at a third downlink frequency different from the first and second downlink frequencies using the base station time slot. Send
When the terminal station receives the downlink data from the base station, the terminal station transmits uplink data on a first uplink frequency using a terminal station time slot allocated to the terminal station. When the downlink data is received from the first relay station, the uplink data is transmitted at a second uplink frequency different from the first uplink frequency using the terminal station time slot. When the downlink data is received from the second relay station, the uplink data is transmitted at a third uplink frequency different from the first and second uplink frequencies using the terminal station time slot. Send
The second relay station transmits uplink data transmitted from the terminal station on the third uplink frequency on the second uplink frequency using the terminal station time slot;
The first relay station transmits uplink data transmitted from the second relay station on the second uplink frequency on the first uplink frequency using the terminal station time slot. A wireless communication method.
(Appendix 9)
The wireless communication method according to attachment 8, wherein
The second relay station transmits downlink data received from the base station at the second downlink frequency, and transmits downlink data received from the first relay station to the third downlink frequency. Send in
When the terminal station receives downlink data of the second downlink frequency from the second relay station, the terminal station transmits uplink data on the second uplink frequency, and the second relay station When the downlink data of the third downlink frequency is received from, the uplink data is transmitted on the third uplink frequency,
When the second relay station receives the uplink data of the second uplink frequency from the terminal station, the second relay station transmits the uplink data at the first uplink frequency, and the terminal station transmits the uplink data from the terminal station. A radio communication method comprising: transmitting uplink data at the second uplink frequency when uplink data of a third uplink frequency is received.
(Appendix 10)
A base station,
A terminal station that performs data communication with the base station in a time division multiplexing manner;
A relay station provided between the base station and the terminal station,
The base station transmits downlink data on a first downlink frequency using a base station time slot allocated to the base station;
The relay station transmits downlink data received from the base station on a second downlink frequency different from the first downlink frequency using the base station time slot;
When the terminal station receives the downlink data from the base station, the terminal station transmits uplink data on a first uplink frequency using a terminal station time slot allocated to the terminal station. When the downlink data is received from the relay station, the uplink data is transmitted at a second uplink frequency different from the first uplink frequency using the terminal station time slot,
The relay station transmits the uplink data transmitted from the terminal station on the second uplink frequency using the terminal station time slot on the first uplink frequency. Wireless communication system.
(Appendix 11)
A relay station apparatus provided between a base station and a terminal station in a wireless communication system that performs data communication in a time division multiplexing system,
Downlink data transmitted from the base station using a base station time slot on a first downlink frequency is transmitted to a second downlink different from the first downlink frequency using the base station time slot. A downlink repeater that transmits at a frequency;
Uplink data transmitted from the terminal station using a terminal time slot on a second uplink frequency is converted into a first uplink different from the second uplink frequency using the terminal station time slot. Uplink repeater transmitting on frequency,
A relay station apparatus.
(Appendix 12)
The relay station device according to attachment 11, wherein
Based on control information included in downlink data transmitted from the base station, a base station time slot allocated to the base station and a terminal station time slot allocated to the terminal station A relay station apparatus comprising: a control unit that detects
(Appendix 13)
A relay station apparatus provided between a base station and a terminal station in a wireless communication system that performs data communication in a time division multiplexing system,
Based on control information included in downlink data transmitted from the base station, a base station time slot allocated to the base station and a terminal station time slot allocated to the terminal station A control unit for detecting
In accordance with control by the control unit, in the base station time slot, downlink data transmitted from the base station at the first downlink frequency is transmitted at a second downlink frequency different from the first downlink frequency. A repeater for transmitting uplink data transmitted from the terminal station at a second uplink frequency at a first uplink frequency different from the second uplink frequency in the terminal station time slot;
A relay station apparatus.
(Appendix 14)
Use in a wireless communication system comprising a base station that transmits / receives a radio signal of a first frequency and a relay station that converts and relays a radio signal transmitted / received by the base station between the first frequency and the second frequency A terminal device,
A first receiver for receiving a downlink signal transmitted by the base station at the first frequency using a base station time slot;
A second receiver for receiving a downlink signal transmitted by the relay station on the second frequency using the base station time slot;
When the downlink signal is received from the base station, an uplink signal is transmitted at the first frequency using a terminal time slot, and when the downlink signal is received from the relay station, the A transmitting unit for transmitting the uplink data on the second frequency using a terminal time slot;
A terminal device having

DESCRIPTION OF SYMBOLS 1 Base station 2 (2a-2d) Terminal station 3 Relay station 3A Building relay station 3B Vehicle relay station 4 Electric wave shield area 4A Building 4B Vehicle 5 GPS satellite 6 Vehicle terminal station 11 Reception part 12, 54 Control part 13, 55-1 , 55-2 Downlink repeaters 14, 56-1, 56-2 Uplink repeaters 18, 19 Received radio wave intensity monitor unit 23 GPS receiver unit 24 Control unit 25, 26 Receiver unit 27 Transmitter unit 29 Receiver unit 43 Repeater

Claims (10)

A wireless communication method for performing communication in a time division multiplexing method in a wireless communication system in which a relay station is provided between a base station and a terminal station,
The base station transmits downlink data on a first downlink frequency using a base station time slot allocated to the base station;
The relay station uses the same base station time slot in the same cycle as the base station time slot that received the downlink data received from the base station in the same cycle as the base station time slot that received the downlink data from the base station . Transmit on a second downlink frequency different from the downlink frequency,
When the terminal station receives the downlink data from the base station, the terminal station transmits uplink data on a first uplink frequency using a terminal station time slot allocated to the terminal station. When the downlink data is received from the relay station, the uplink data is transmitted at a second uplink frequency different from the first uplink frequency using the terminal station time slot,
The relay station transmits the uplink data transmitted from the terminal station at the second uplink frequency to the same terminal station in the same cycle as the terminal station time slot that has received the uplink data from the terminal station. A radio communication method characterized by transmitting on the first uplink frequency using a time slot. The wireless communication method according to claim 1,
When the terminal station receives downlink data from the base station and the relay station, the terminal station selects the first or second uplink frequency according to a state of a radio signal for obtaining position information, and A wireless communication method characterized by transmitting uplink data. The wireless communication method according to claim 1 or 2,
When the terminal station receives downlink data from the base station and the relay station, the terminal station selects the first or second uplink frequency based on the received radio wave from the base station and the relay station, and A wireless communication method characterized by transmitting uplink data. The wireless communication method according to claim 1,
In the base station time slot, the relay station operates a downlink repeater that transmits downlink data from the base station to the terminal station, and transmits uplink data from the terminal station to the base station. Stop the uplink repeater
The wireless communication method, wherein the relay station stops a downlink repeater and operates an uplink repeater from the terminal station in the terminal station time slot. The wireless communication method according to claim 1,
The relay station stops a downlink repeater that transmits downlink data from the base station to the terminal station during a period when the received radio wave of the first downlink frequency is lower than a threshold level. Wireless communication method. The wireless communication method according to claim 1,
The relay station stops an uplink repeater that transmits uplink data from the terminal station to the base station during a period when the received radio wave of the second uplink frequency is lower than a threshold level. Wireless communication method. A wireless communication method for performing communication by a time division multiplexing method in a wireless communication system in which first and second relay stations are provided between a base station and a terminal station,
The base station transmits downlink data on a first downlink frequency using a base station time slot allocated to the base station;
The first relay station receives the downlink data received from the base station using the same base station time slot in the same cycle as the base station time slot that received the downlink data from the base station. Transmitting on a second downlink frequency different from the first downlink frequency;
The second relay station transmits the downlink data received from the first relay station to the same base station time in the same cycle as the base station time slot that received the downlink data from the first relay station. Transmitting on a third downlink frequency different from the first and second downlink frequencies using a slot;
When the terminal station receives the downlink data from the base station, the terminal station transmits uplink data on a first uplink frequency using a terminal station time slot allocated to the terminal station. When the downlink data is received from the first relay station, the uplink data is transmitted at a second uplink frequency different from the first uplink frequency using the terminal station time slot. When the downlink data is received from the second relay station, the uplink data is transmitted at a third uplink frequency different from the first and second uplink frequencies using the terminal station time slot. Send
The second relay station transmits the uplink data transmitted from the terminal station at the third uplink frequency in the same cycle as the terminal station time slot that received the uplink data from the terminal station. Transmitting on the second uplink frequency using a terminal time slot;
The first relay station receives uplink data transmitted from the second relay station at the second uplink frequency, and a terminal time slot that has received the uplink data from the second relay station. A radio communication method comprising: transmitting on the first uplink frequency using the same terminal station time slot in the same cycle . A base station,
A terminal station that performs data communication with the base station in a time division multiplexing manner;
A relay station provided between the base station and the terminal station,
The base station transmits downlink data on a first downlink frequency using a base station time slot allocated to the base station;
The relay station uses the same base station time slot in the same cycle as the base station time slot that received the downlink data received from the base station in the same cycle as the base station time slot that received the downlink data from the base station . Transmit on a second downlink frequency different from the downlink frequency,
When the terminal station receives the downlink data from the base station, the terminal station transmits uplink data on a first uplink frequency using a terminal station time slot allocated to the terminal station. When the downlink data is received from the relay station, the uplink data is transmitted at a second uplink frequency different from the first uplink frequency using the terminal station time slot,
The relay station transmits the uplink data transmitted from the terminal station at the second uplink frequency to the same terminal station in the same cycle as the terminal station time slot that has received the uplink data from the terminal station. A radio communication system, characterized in that a time slot is used for transmission on the first uplink frequency. A relay station apparatus provided between a base station and a terminal station in a wireless communication system that performs data communication in a time division multiplexing system,
The downlink data transmitted on the first downlink frequency using the base station time slot from the base station is the same base in the same cycle as the base station time slot from which the base station transmits the downlink data. A downlink repeater transmitting at a second downlink frequency different from the first downlink frequency using a station time slot;
Uplink data transmitted from the terminal station using a terminal time slot at a second uplink frequency is transmitted in the same end as the terminal time slot in which the terminal station transmits the uplink data. An uplink repeater transmitting at a first uplink frequency different from the second uplink frequency using a station time slot;
A relay station apparatus. The relay station apparatus according to claim 9, wherein
Based on control information included in downlink data transmitted from the base station, a base station time slot allocated to the base station and a terminal station time slot allocated to the terminal station A relay station apparatus comprising: a control unit that detects