JP2005117310A - Wireless communication system - Google Patents

Abstract

An object of the present invention is to provide a radio communication system capable of preventing degradation of reception quality due to a propagation path failure.
A main radio communication system (12, 13), a plurality of sub radio communication systems (12, 14, 15) capable of communicating with radio communication terminals in the main radio communication system, a main radio communication system, and a plurality of sub radio communication systems. The control station 10 controls the sub-radio communication system, and the control station is used together with the main radio communication system based on the quality of received signals from the radio communication terminals in the plurality of sub-radio communication systems. A sub wireless communication system that forms a plurality of wireless communication paths is selected.
[Selection] Figure 1

Description

  The present invention relates to a wireless communication system for wirelessly communicating audio data and the like.

  In conventional wireless communication systems, various communication methods are used to improve reception quality. For example, there are two receiving circuits including an antenna of a wireless communication apparatus, each receiving circuit receives signals simultaneously, and a receiving diversity for selecting a receiving signal having a good receiving state, or a plurality of receiving circuits via a switching circuit. It is famous for antenna switching diversity that connects an antenna, selects an antenna with good reception, and performs reception.These methods are a direct wave that a radio signal sent from the transmitting side directly reaches the receiving side. To improve reception performance in an environment where the received signal is weakened by fading phenomenon caused by the difference in the distance of each radio wave propagation path when multiple radio signals such as reflected waves reflected by buildings and walls arrive. It is valid. This method is used in a conventional mobile phone base station, which receives transmission signals from a terminal with multiple antennas, selects an antenna with a good reception state, transmits it to the terminal, and performs bidirectional communication. The quality was improved. Further, in a wireless communication system using a time division multiplexing method, a wireless link is established using a plurality of slots in one frame between wireless communication apparatuses, and the same transmission data is sent from the transmission side in a plurality of slots. There has also been proposed a method for receiving data of each slot on the receiving side and selecting data having a good reception state.

In relation to the wireless communication system as described above, for example, (Patent Document 1) describes that two wireless links are established using time slots.
Special table 2003-500595 gazette

  However, in various conventional wireless communication systems that improve reception quality, there is one device that transmits radio and one device that receives radio, and a device that generates an interference wave on a wireless propagation path between the devices. If there is an interference wave and a shield that shields the propagation path appears, reception due to interference on the propagation path such as a disturbing wave generated on the propagation path between devices or a shield on the propagation path There was a problem that quality deterioration could not be prevented sufficiently.

  This wireless communication system is required to be able to prevent degradation of reception quality due to a propagation path failure.

  An object of this invention is to provide the radio | wireless communications system which can prevent degradation of the reception quality by the failure on a propagation path.

  In order to solve the above problems, a radio communication system of the present invention includes a main radio communication system, a plurality of sub radio communication systems capable of communicating with radio communication terminals in the main radio communication system, a main radio communication system, and a plurality of radio communication systems. A radio communication system comprising a control station for controlling a sub radio communication system, wherein the control station includes a plurality of sub radio communication systems together with a main radio communication system based on the quality of received signals from radio communication terminals. A sub-radio communication system that forms a radio communication path is selected.

As a result, a wireless communication system capable of preventing deterioration in reception quality due to a propagation path failure is obtained.

  The radio communication system of the present invention controls a main radio communication system, a plurality of sub radio communication systems capable of communicating with radio communication terminals in the main radio communication system, and a main radio communication system and a plurality of sub radio communication systems. A control station configured to form a plurality of radio communication paths together with a main radio communication system based on a quality of a received signal from a radio communication terminal in the plurality of sub radio communication systems. By selecting a wireless communication system, one signal can be transmitted / received via different propagation paths, and a reception signal with good quality can be selected from a plurality of reception signals. An advantageous effect that deterioration can be prevented is obtained.

  Further, in a radio communication system having one main base station, two sub base stations, a radio telephone capable of communicating with the main base station and the sub base station, and a control station for controlling the main base station and the sub base station Then, the control station performs communication between the two sub base stations and the radio telephone through the main base station, and compares the quality of the received signal from the radio telephone at the two sub base stations, and the quality is high. Wireless telephone by selecting one of the secondary base stations and communicating with the wireless telephone using two wireless communication paths between the primary base station and the higher quality secondary base station with the wireless telephone. When transmitting a signal from the base station to the base station, in addition to transmitting and receiving signals between the radio telephone and the main base station, it is possible to transmit and receive signals between the radio telephone and the selected sub base station. Received signal between wireless telephone and main base station and wireless telephone / subgroup Comparing the received signal between stations, it is possible to select a good signal reception conditions, advantageous effect that it is possible to prevent deterioration of reception quality of a signal from the radio telephone set is obtained at the base station.

  Furthermore, one main base station, first to n-th (n is a natural number of 2 or more) sub-base stations, a radio telephone capable of communicating with the main base station and the sub-base station, main base station and sub-base station And a control station that controls the first to nth sub-base stations and the radio telephone through the main base station, the first to n-th communication stations. Compare the quality of the received signal from the radio telephone in the sub base station of and select the sub base station with the highest quality or multiple sub base stations in order of quality, and select the main base station with the radio telephone 2 or 3 or more by communicating with a wireless telephone using two wireless communication paths or three or more wireless communication paths with the sub-base station having the highest quality or a plurality of selected sub-base stations. Can transmit and receive between a wireless telephone and a base station using a wireless communication channel In the received signal in each radio channel can be made to compare with each other, advantageous effects can be obtained that it is possible to prevent deterioration of reception quality of a signal from the radio telephone set at the base station.

Furthermore, the wireless communication system includes a parent device and a child device that perform communication using the TDMA system, and a relay device that relays wireless communication between the parent device and the child device. A wireless unit that performs error detection data and synchronization data to transmission data to generate a data string to be transmitted in each slot, and reception of each slot received and demodulated by the wireless unit The received data and error detection data are extracted from the signal, and the reception data processing unit that detects whether there is a reception error in the reception data of each slot, and the data that has no reception error are selected based on the error detection result in the reception data processing unit. A slave unit that performs wireless transmission / reception by the TDMA method, and error detection data and synchronization with transmission data. And a transmission data processing unit for generating a data sequence to be transmitted in each slot, and extracting reception data and error detection data from the reception signal of each slot received and demodulated by the radio unit, and the reception data of each slot A reception data processing unit that detects the presence or absence of a reception error, and a control unit that performs control to select and process data that has no reception error based on the error detection result in the reception data processing unit. A radio unit that performs radio transmission / reception by the TDMA method, a transmission data processing unit that adds data for error detection and synchronization data to transmission data, and generates a data sequence to be transmitted in each slot, and a radio unit The received data and error detection data are extracted from the received signal of each slot demodulated in step 4, and whether there is a reception error in the received data of each slot. And a control unit that performs control so that the reception data from the master unit is transmitted to the slave unit and the reception data from the slave unit is transmitted to the master unit. When communicating between machines, it is possible to send and receive signals directly via a repeater while transmitting and receiving signals directly between the master and slave, so the master and slave can be used using two propagation paths. Between the master unit and the slave unit, it is possible to select signals with good reception status, and even if the radio status between the master unit and slave unit deteriorates, the reception quality deteriorates. In addition, by performing communication by the TDMA method, the wireless unit of the parent device and the child device can perform a plurality of wireless communication with one wireless unit, and the parent device and the child device can be configured with a simple circuit configuration. Sending and receiving via a repeater while performing direct wireless transmission and reception between The advantageous effect of being able to be performed is obtained.

  Furthermore, a wireless communication system comprising a master unit and a slave unit, and a relay unit that relays wireless communication between the master unit and the slave unit, wherein the master unit or the slave unit is a slave unit or Communication with the master unit is started, then the master unit starts communication with the repeater unit and the slave unit starts communication with the repeater unit. The master unit receives the received signal from the slave unit and the repeater unit. Compare the signal and select the better received data and perform reception processing. The slave unit compares the received signal from the master unit with the received signal from the repeater to select the better received data. By performing reception processing, during communication between the master unit and slave units, signals can be sent and received via the repeater at the same time while transmitting and receiving signals directly between the master unit and slave units. Communication between the master unit and slave unit is possible using the propagation path, and the reception state is good in both the master unit and slave unit It is possible to select a signal, advantageous effect that even degraded radio conditions between the master unit and the slave unit becomes possible to prevent degradation of reception quality can be obtained.

  Furthermore, the wireless communication system includes a parent device and a child device, and at least one relay device that relays wireless communication between the parent device and the child device. , Start communication with the slave unit or the master unit, the repeater transmits a signal that can be received by the slave unit, the slave unit receives the transmission signal of the repeater and detects the quality of the received signal, Based on the quality of the received signal, select a repeater with good reception quality, start communication with the selected repeater, start communication with the master via the selected repeater, and the master Compare the received signal from the machine with the received signal from the repeater and select the better received data for reception processing. The slave unit receives the received signal from the master unit and the received signal from the repeater. By selecting the received data that is better than the received data and processing the received data, By transmitting and receiving signals directly via a repeater while transmitting and receiving signals directly between them, communication between the master and slave units is possible using two propagation paths. It is possible to select a signal with good reception status, and it is possible to prevent degradation of reception quality even if the radio status between the master unit and slave unit deteriorates. Advantageous effect that the optimal repeater can be selected based on the reception status of the transmitted signal and communication between the master unit and the slave unit can be performed via the optimal repeater and the reception quality can be improved. Is obtained.

Furthermore, the wireless communication system includes a parent device and a child device, and at least one relay device that relays wireless communication between the parent device and the child device. , Start communication with the slave unit or the master unit, the slave unit transmits a signal that can be received by the relay unit, the relay unit receives the transmission signal of the slave unit and detects the quality of the received signal, The slave unit selects the repeater with the better reception quality based on the quality of the received signal, starts communication with the selected repeater, starts communication with the master unit via the selected repeater, The master unit compares the received signal from the slave unit with the received signal from the selected repeater and selects the better received data for reception processing. The slave unit selects the received signal from the master unit. Compared with the received signal from the repeater, the better received data is selected and processed for reception. When communicating between slave units, it is possible to send and receive signals directly via the repeater while transmitting and receiving signals directly between the master unit and slave units, so the master unit and slave units can be transmitted using two propagation paths. Communication between units becomes possible, and it is possible to select signals with good reception status in both the base unit and slave units, and prevent deterioration in reception quality even if the radio state between the base unit and slave units deteriorates It is also possible to select the optimal relay unit based on the reception status of the transmission signal from the slave unit received at the relay unit, and communication between the master unit and the slave unit via the optimal relay unit is possible. Thus, an advantageous effect that the reception quality can be improved is obtained.

  Furthermore, a wireless communication system comprising a parent device and a child device that perform communication using the TDMA system, and at least one relay device that relays wireless communication between the parent device and the child device, the parent device or the child device The machine starts communication with the child machine or the parent machine by calling from the own machine or the other machine, and the parent machine starts communication between the child machine and the relay machine and uses the slot used for communication as the child machine and the relay machine. The slave unit transmits a signal to the repeater in the slot designated by the master unit, and the repeater receives the transmission signal from the slave unit in the slot designated by the master unit, and transmits the transmission signal from the slave unit. Detects reception quality, notifies reception quality to base unit, base unit selects relay unit based on reception quality notified from each relay unit, and instructs selected relay unit to start communication with slave unit The selected repeater and slave unit start communication in the slot designated by the master unit. Compare the received signal with the received signal from the selected repeater and select the better received data for reception processing. The slave unit receives the received signal from the master unit and the selected repeater. When the communication between the master unit and the slave unit is performed by selecting and receiving the better received data by comparing with the signal, the relay unit is simultaneously transmitting and receiving the signal between the master unit and the slave unit. Since the signal can be transmitted and received via, communication between the master unit and the slave unit is possible using two propagation paths, and it is possible to select a signal with good reception status in both the master and slave units. It is possible to prevent deterioration in reception quality even if the radio state between the master unit and the slave unit deteriorates, and the optimum repeater based on the reception status of the transmission signal from the slave unit received by the repeater Can be selected, and communication between the master unit and the slave unit is possible via the optimum repeater Therefore, it is possible to improve the reception quality, and by specifying the slot to be used between the slave unit and repeater from the master unit, it is possible to manage the slot used in the system in the master unit, which is efficient An advantageous effect is obtained in that it is possible to operate the slot allocation in an appropriate manner.

  Furthermore, a wireless communication system comprising a parent device and a child device that perform communication using the TDMA system, and at least one relay device that relays wireless communication between the parent device and the child device, the parent device or the child device The machine starts communication with the child machine or the parent machine by calling from the own machine or the other machine, and the parent machine instructs the relay machine to start communication between the child machine and the relay machine and the slot used for communication. The repeater transmits a signal to the slave in the slot indicated by the master, and the master instructs the slave to receive the transmission signal from the repeater in the slot indicated by the master. , Receive the signal from the repeater, detect the reception quality, select the repeater based on the reception quality of the transmission signal transmitted from each repeater, start communication with the selected repeater, and select The repeater starts communication with the master unit. The master unit is the received signal from the slave unit and the selected repeater. Compared with the received signal, select the better received data and perform reception processing, and the slave unit compares the received signal from the master unit with the received signal from the selected repeater. By selecting the received data and performing reception processing, during communication between the master unit and slave unit, the signal is transmitted / received via the repeater at the same time while transmitting / receiving signals directly between the master unit and slave unit Therefore, it is possible to communicate between the master unit and the slave unit using two propagation paths, and it is possible to select a signal with good reception status in both the master unit and the slave unit. It is possible to prevent degradation of reception quality even if the radio condition of the mobile station deteriorates, and the optimum repeater is selected based on the reception state of the transmission signal from the repeater received at the slave unit. Communication between the master and slave units via a repeater becomes possible, and the reception quality is improved. In addition, by specifying the slot to be used between the slave unit and repeater from the master unit, it is possible to manage the slot used in the system in the master unit, and to enable efficient slot allocation operation An advantageous effect is obtained.

In addition, radio communication is multiplexed using the TDMA method, and the frequency used in each slot is changed between a predetermined frequency and a parent device and a child device that perform communication using a frequency hopping method in which communication is performed. A wireless communication system comprising at least one repeater for relaying wireless communication between the slave unit and the slave unit, wherein the master unit transmits a control slot for synchronization of TDMA and frequency hopping, and the slave unit is transmitted from the master unit The control slot is received to establish synchronization between TDMA and frequency hopping, and the master unit or slave unit starts communication with the slave unit or master unit in a slot other than the control slot based on a call from the own unit or the partner unit. The master unit instructs the repeater to start transmission of the control slot, and the repeater receives the control slot from the master unit and confirms the synchronization between TDMA and frequency hopping. In response to an instruction to start transmission of a control slot from the master unit, the control unit for TDMA and frequency hopping synchronization is transmitted in a slot other than the slot in which the master unit and the slave unit communicate with each other. Receive slots other than the slot that communicates with the base unit, receive the control slot transmitted by the repeater, select a repeater with good reception quality, and request the selected repeater to start communication , Communicate with the selected relay device, the relay device starts communication with the child device in response to a request for communication start from the child device, requests the parent device to start communication, communicates with the parent device, The master unit starts communication in response to the start of communication from the repeater, and instructs the repeater to stop transmitting the control slot as necessary. The repeater transmits the control slot according to the instruction from the master unit. And the master unit receives signals from the slave units. Compare the received signal from the repeater and select the better received data and perform reception processing. The slave unit compares the received signal from the master unit with the received signal from the repeater. By selecting the received data and receiving the data, it is possible to send and receive signals via the repeater at the same time while transmitting and receiving signals directly between the master and slave when communicating between the master and slave. Therefore, it is possible to communicate between the master unit and the slave unit using two propagation paths, and it is possible to select a signal with good reception status in both the master unit and the slave unit. It is possible to prevent the reception quality from being deteriorated even if the radio condition is deteriorated, and after the start of communication between the master unit and the slave unit, the slave unit receives the control signal transmitted by the relay unit and the reception quality is good. It is possible to communicate by selecting a repeater, and further improve the radio reception quality In addition, by performing communication using the frequency hopping method, each repeater transmits a control signal in the same slot, but the slave unit transmits in the same slot by changing the frequency switching control. It is possible to receive a control slot from a relay station, and even if the number of TDMA slots is small, it is possible to receive a transmission signal of a larger number of relay stations, and the simultaneous transmission of the relay station is limited by the number of TDMA slots. Therefore, there is an advantageous effect that effective operation is possible.

  Further, the repeater is instructed to switch to the operation as the repeater from the master unit, and starts to operate as the repeater according to the instruction of the master unit, so that the master unit and one slave unit communicate with each other. When performing the operation, another slave unit operates as a repeater, and an advantageous effect is obtained that a device that operates exclusively for the repeater is not required, and an inexpensive wireless communication system can be constructed.

  In order to suppress deterioration of reception quality due to an interference source (failure on a propagation path) generated on a propagation path of wireless communication, the present invention performs communication by a plurality of transmission apparatuses and reception apparatuses for one communication, Multiple wireless communications were performed simultaneously, signals with good reception quality were selected, and deterioration of reception quality due to interference sources on the propagation path was prevented.

  A first invention made to solve the above problems includes a main radio communication system, a plurality of sub radio communication systems capable of communicating with radio communication terminals in the main radio communication system, a main radio communication system, and a plurality of sub radio communication systems. A radio communication system comprising a control station for controlling a sub radio communication system, wherein the control station includes a plurality of sub radio communication systems together with a main radio communication system based on the quality of received signals from radio communication terminals. By selecting a sub wireless communication system that forms a wireless communication path, one signal can be transmitted and received via different propagation paths, and a reception signal with good quality among a plurality of reception signals can be selected. It has an operation and effect that it is possible to prevent deterioration of reception quality due to a propagation path failure.

  The second invention made to solve the above-mentioned problems is that one main base station, two sub base stations, a radio telephone capable of communicating with the main base station and the sub base station, a main base station and a sub base A wireless communication system having a control station for controlling a station, wherein the control station communicates with two wireless base stations via the main base station, and wireless telephones in the two secondary base stations Compare the quality of the received signal from each other, select the secondary base station with the higher quality, and use the two wireless communication channels between the primary base station and the secondary base station with the higher quality between the wireless telephones. When transmitting a signal from the wireless telephone to the base station by communicating with the wireless telephone, in addition to transmitting and receiving signals between the wireless telephone and the main base station, between the wireless telephone and the selected sub base station Because it can send and receive signals, the control station Compares the received signal between the base stations and the received signal between the radio telephone and the sub-base station, and can select the signal with good reception status, preventing deterioration of the reception quality of the signal from the radio telephone at the base station It has the action and effect of being able to.

  A third invention made to solve the above-mentioned problems is a communication between one main base station, first to n-th (n is a natural number of 2 or more) sub-base stations, and the main base station and sub-base stations. A wireless communication system having a wireless telephone and a control station that controls a main base station and a sub base station, wherein the control station wirelessly communicates with the first to nth sub base stations via the main base station. Communicate with the telephone, compare the quality of the received signal from the radio telephone in the 1st to n-th sub-base stations, and select the sub-base station with the highest quality or multiple sub-base stations in order of quality A wireless telephone using two wireless communication paths or three or more wireless communication paths between the primary base station and the selected sub base station having the highest quality or a plurality of selected secondary base stations with the wireless telephone. Wireless telephone using two or more wireless communication channels・ Because transmission and reception between base stations can be performed, it is possible to compare received signals in each wireless communication path with each other, and to prevent deterioration of reception quality of signals from wireless telephones in the base station. Has an effect.

A fourth invention made to solve the above problem is a wireless communication system comprising a parent device and a child device that perform communication using the TDMA system, and a relay device that relays wireless communication between the parent device and the child device. The master unit includes a radio unit that performs radio transmission / reception using the TDMA method, and a transmission data processing unit that adds data for error detection and data for synchronization to the transmission data to generate a data string to be transmitted in each slot. A reception data processing unit that extracts reception data and error detection data from the reception signal of each slot received and demodulated by the radio unit and detects whether there is a reception error in the reception data of each slot; and error detection in the reception data processing unit A control unit that performs control so as to select and process data that has no reception error based on the result, and the slave unit includes a radio unit that performs radio transmission / reception by the TDMA method, and a transmission unit. Data for error detection and synchronization data are added to the data to generate a data sequence to be transmitted in each slot, and the received data and error detection from the received signal in each slot received and demodulated by the radio unit Control to extract data and receive data processing unit that detects the presence or absence of reception error of received data in each slot, and to select and process data with no reception error based on error detection result in received data processing unit The relay unit includes a wireless unit that performs wireless transmission / reception by the TDMA method, and a data sequence that is transmitted in each slot by adding error detection data and synchronization data to transmission data. The received data and error detection data are extracted from the received data of each slot received and demodulated by the transmission unit, and the received data and error detection data are generated. A reception data processing unit that detects whether there is a reception error in the reception data of the mobile station, and a control for transmitting the reception data from the master unit to the slave unit and transmitting the reception data from the slave unit to the master unit 2 can transmit and receive signals directly via the repeater while simultaneously transmitting and receiving signals between the master and slave when communicating between the master and slave. It is possible to perform communication between the master unit and slave unit using two propagation paths, and it is possible to select signals with good reception status in both the master unit and slave unit, and wireless communication between the master unit and slave unit Even if the state deteriorates, it is possible to prevent deterioration of the reception quality, and by performing communication by the TDMA method, the wireless unit of the master unit and the slave unit can perform a plurality of wireless communication by one wireless unit. , Direct wireless transmission / reception between the master and slave units with a simple circuit configuration It is possible to perform transmission / reception via a repeater while performing communication.

  A fifth invention made to solve the above problems is a wireless communication system comprising a parent device and a child device, and a relay device that relays wireless communication between the parent device and the child device, wherein the parent device or the child device Starts communication with the slave unit or base unit by calling from its own unit or the partner unit, and then the base unit starts communication with the relay unit and the slave unit starts communication with the relay unit. Compares the received signal from the slave unit and the received signal from the repeater, selects the better received data, and processes the received data. The slave unit receives the received signal from the master unit and the received signal from the repeater. By selecting the better received data and processing the received data, it is possible to send and receive signals directly between the master unit and the slave unit while communicating via the repeater at the same time. Can transmit and receive signals, so it is possible to communicate between the master and slave units using two propagation paths. It is possible to select a signal with good reception status in both the master unit and the slave unit, and it is possible to prevent deterioration in reception quality even if the radio state between the master unit and slave unit deteriorates. Have

  A sixth invention made to solve the above problems is a wireless communication system comprising a parent device and a child device, and at least one relay device that relays wireless communication between the parent device and the child device. The master unit or slave unit starts communication with the slave unit or master unit by calling from the own unit or the partner unit, the relay unit transmits a signal that can be received by the slave unit, and the slave unit transmits the relay unit. Receives the signal, detects the quality of the received signal, selects a repeater with good reception quality based on the quality of the received signal, starts communication with the selected repeater, and performs parent communication via the selected repeater. The master unit starts communication with the unit, the master unit compares the received signal from the slave unit with the received signal from the repeater unit, selects the better received data, and performs reception processing. Compare the received signal from and the received signal from the repeater and select the better received data for reception processing Therefore, when communicating between the master unit and the slave unit, while transmitting and receiving signals directly between the master unit and the slave unit, simultaneously transmitting and receiving signals via the relay unit, the master unit can be used using two propagation paths.・ Communication between slave units becomes possible, and it is possible to select signals with good reception status in both the master unit and slave units, and even if the wireless status between the master unit and slave units deteriorates, the reception quality deteriorates. It is possible to prevent this, and the optimal repeater is selected based on the reception status of the transmission signal from the repeater received at the slave unit, and communication between the master unit and the slave unit via the optimal repeater unit Therefore, the reception quality can be improved.

  A seventh invention made to solve the above-described problem is a wireless communication system comprising a parent device and a child device, and at least one relay device that relays wireless communication between the parent device and the child device. The master unit or slave unit starts communication with the slave unit or master unit by calling from the own unit or the partner unit, the slave unit transmits a signal that can be received by the relay unit, and the relay unit transmits the slave unit. Receiving the signal and detecting the quality of the received signal, the slave unit selects the repeater with the better reception quality based on the received signal quality, starts communication with the selected repeater, and selects the selected relay The master unit starts communication with the master unit, and the master unit compares the received signal from the slave unit with the received signal from the selected repeater and selects the better received data for reception processing. The slave unit compares the received signal from the master unit with the received signal from the selected repeater. By selecting and performing reception processing, it is possible to send and receive signals via a repeater at the same time while transmitting and receiving signals directly between the master and slave units during communication between the master unit and slave units. Communication between the master unit and slave unit is possible using two propagation paths, and it is possible to select a signal with good reception status in both the master unit and slave unit, and the wireless status between the master unit and slave unit It is possible to prevent degradation of reception quality even if the signal quality deteriorates. In addition, the optimum repeater is selected based on the reception status of the transmission signal from the slave unit received by the repeater. Communication between the master unit and the slave unit is possible, and the reception quality can be improved.

An eighth aspect of the invention made to solve the above-described problems is a master unit and a slave unit that communicate using the TDMA method, and at least one relay unit that relays wireless communication between the master unit and the slave unit. A wireless communication system comprising: a parent device or a child device starts communication with the child device or the parent device by a call from the own device or a partner device, and the parent device starts communication between the child device and the relay device. The slave unit and the repeater are instructed to the slot used for communication, the slave unit transmits a signal to the repeater in the slot designated by the master unit, and the repeater receives the signal from the slave unit in the slot designated by the master unit. Receiving the transmission signal, detecting the reception quality of the transmission signal from the slave unit, notifying the reception unit of the reception quality, the master unit selects the relay unit based on the reception quality notified from each relay unit, Instruct the selected repeater to start communication with the slave unit. The selected repeater and slave unit are instructed by the master unit. Communication is started in the slot, and the master unit compares the received signal from the slave unit with the received signal from the selected repeater unit, selects the better received data, and performs reception processing. Compare the received signal from the machine with the received signal from the selected repeater and select the better received data for reception processing. Since signals can be sent and received directly via the repeater while sending and receiving signals directly between the machines, communication between the master and slave is possible using two propagation paths. It is possible to select a signal with good reception status, and it is possible to prevent degradation of reception quality even if the radio status between the master unit and slave unit deteriorates. The optimal repeater is selected based on the reception status of Communication between the master unit and the slave unit via the relay unit is possible, improving the reception quality. By specifying the slot to be used between the slave unit and relay unit from the master unit, the master unit Can manage the slots used in the system, and has an operation and effect that enables efficient slot allocation operation.

  A ninth aspect of the invention made to solve the above-described problems includes a parent device and a child device that perform communication using the TDMA method, and at least one relay device that relays wireless communication between the parent device and the child device. A wireless communication system comprising: a parent device or a child device starts communication with the child device or the parent device by a call from the own device or a partner device, and the parent device starts communication between the child device and the relay device. Instruct the relay unit which slot to use for communication, and the relay unit transmits a signal to the slave unit in the slot specified by the base unit. The base unit transmits the transmission signal from the relay unit in the slot indicated by the base unit. The slave unit is instructed to receive, the slave unit receives the signal from the relay unit, detects the reception quality, selects the relay unit based on the reception quality of the transmission signal transmitted from each relay unit, Starts communication with the selected repeater, the selected repeater starts communication with the master, and the master The received signal from the slave unit and the received signal from the selected repeater are compared and the better received data is selected for reception processing. The slave unit receives the received signal from the master unit and the selected repeater. By comparing the received signal with the received signal and selecting the better received data and processing it, it is possible to transmit and receive signals directly between the master and slave while communicating between the master and slave. Since signals can be sent and received via a repeater, communication between the master and slave units is possible using two propagation paths, and signals with good reception are selected on both the master and slave units. It is possible to prevent deterioration in reception quality even if the radio state between the master unit and the slave unit deteriorates, and based on the reception status of the transmission signal from the repeater received at the slave unit. Select the most suitable repeater for the main unit and slave unit via the most suitable repeater It is possible to improve the reception quality, and by specifying the slot used between the slave unit and repeater from the master unit, it is possible to manage the slot used in the system in the master unit Thus, it has an operation and an effect that an efficient slot allocation operation is possible.

A tenth invention made to solve the above problem is a frequency hopping method in which radio communication multiplexing is performed using the TDMA method, and the frequency used in each slot is communicated while switching a predetermined frequency. A wireless communication system comprising a parent device and a child device that communicate with each other, and at least one relay device that relays wireless communication between the parent device and the child device, wherein the parent device controls TDMA and frequency hopping synchronization The slave unit receives the control slot from the master unit and establishes synchronization between TDMA and frequency hopping. Communication with the slave unit or master unit is started in the slot, the master unit instructs the repeater to start transmission of the control slot, and the repeater receives the control slot from the master unit. TDMA and frequency hopping synchronization are established, and a control slot for synchronization of TDMA and frequency hopping is received in a slot other than the slot in which the master unit and the slave unit communicate with each other upon receiving an instruction to start control slot transmission from the master unit The slave unit receives a slot other than the slot that communicates with the master unit, receives the control slot transmitted by the repeater, selects a repeater with good reception quality, and selects Requests to start communication with the selected repeater, communicates with the selected repeater, the relay starts communication with the slave in response to a request for communication start from the slave, and requests to start communication with the master Communicates with the master unit, the master unit starts communication in response to the start of communication from the repeater unit, and instructs the repeater unit to stop transmission of control slots as necessary. Control slot according to instructions from the machine Transmission is stopped, the master unit compares the received signal from the slave unit with the received signal from the repeater, selects the better received data, receives the received data, and the slave unit receives the received signal from the master unit. Compared with the received signal from the repeater, select the better received data and process it to receive and transmit signals directly between the master and slave when communicating between the master and slave At the same time, since signals can be sent and received via a repeater, communication between the master unit and slave units is possible using two propagation paths, and signals with good reception in both the master unit and slave units Can be selected, and even if the wireless status between the master unit and slave unit deteriorates, it is possible to prevent the reception quality from being deteriorated. It is possible to communicate by selecting a repeater with good reception quality when the slave unit receives a control signal In addition, it is possible to further improve the radio reception quality, and by performing communication by the frequency hopping method, each repeater can control the switching of the frequency even if it transmits a control signal in the same slot. The slave unit can receive the control slot from the repeater transmitted in the same slot, and can receive the transmission signal of more repeaters even if the number of TDMA slots is small. There is no restriction on the simultaneous transmission of the repeater due to the number of slots, and there is an effect that the effective operation becomes possible.

  An eleventh invention made to solve the above problem is a slave unit in which a repeater is instructed to switch to operation as a repeater from the master unit, and starts operation as a repeater according to the instruction of the master unit. As a result, when the master unit and one slave unit communicate with each other, the other slave unit operates as a repeater, and an apparatus that operates exclusively for the repeater is not required, and an inexpensive wireless communication system can be constructed. Has action and effect.

(Embodiment 1)
FIG. 1 is a block diagram showing a radio communication system according to Embodiment 1 of the present invention.

  In FIG. 1, 11 is a wired telephone, 12 is a wireless telephone (wireless communication terminal) that communicates by radio signals, 13 is a first base station (main base station), and 14 is a second base station (sub-base station). , 15 is a third base station (sub-base station), and 10 is a control station that performs communication connection by performing communication connection. Here, the radio telephone 12 and the first base station 13 constitute a main radio communication system, and the radio telephone 12, the second base station 14, the radio telephone 12 and the third base station 15 are a plurality of sub radios. Configure a communication system.

  FIG. 2 is a data format diagram showing a data structure of a communication slot between a base station and a wireless telephone used during communication in the wireless communication system of FIG.

  As shown in FIG. 2, the data transmitted / received in the communication slot is composed of synchronization data, control data, voice data, and CRC. The synchronization data is data for obtaining bit synchronization and slot synchronization, and the control data is communication. Data for communication of various control signals such as start, response, and disconnection, voice data is data for voice signal communication, and CRC data is data for error detection of a received signal. In the control data portion, idle data indicating that there is no control data is inserted when there is no control data to be transmitted.

  In the wireless communication system of FIG. 1, an operation when the wireless telephone 12 is called from the wired telephone 11 and a voice call is performed will be described.

  In the normal state, the control station 10 sends a time signal serving as a TDMA reference to the connected base stations 13 to 15, and each base station 13 to 15 constitutes a TDMA frame and slot while maintaining synchronization. A control slot (slot for transmitting control data) is transmitted at a predetermined control frequency using one slot. Further, the radio telephone 12 receives a radio signal of a control frequency, selects a receivable base station, configures a TDMA frame and slot while receiving control data, and transmits a frame with the selected base station. And the reception is continued while waiting for the synchronization of the slots.

  When the telephone number of the wireless telephone 12 is dialed from the wired telephone 11, the control station 10 transmits the signal for calling the wireless telephone 12 to the first base station 13, the second base station 14, and the third base station. The station 15 is instructed. The first base station 13, the second base station 14, and the third base station 15 follow the instruction from the control station 10 to transmit the control slot transmission data (transmission data including at least control data) to the radiotelephone 12. Start transmission with a signal to notify the incoming call. Here, the operation when the wireless telephone 12 is waiting for the first base station 13 will be described. When receiving the data of the control slot that notifies the incoming call, the wireless telephone 12 transmits a response signal for the incoming call in the transmission slot corresponding to the control slot transmitted from the first base station 13. The first base station 13 that has received the response signal from the radio telephone 12 notifies the radio telephone 12 of the communication slot and frequency in the control slot, and is designated to receive the synchronization signal from the radio telephone 12. Reception is started using the frequency designated for reception in the slot. The wireless telephone 12 transmits a synchronization signal for starting communication using the frequency specified in the notified slot, and at the same time starts reception using the frequency specified in the corresponding reception slot. When the first base station 13 receives the synchronization signal from the radio telephone 12, the first base station 13 starts transmission for synchronization in the transmission slot of the slot designated for communication, and thereby the radio base station 12 and the first base station 13. A wireless link for communication between them is established. When the radio link is established, the first base station 13 notifies the control station 10 that the radio link with the radio telephone 12 is established and the slot where the radio link is established.

  When the first radio link between the base station and the radio telephone is established, the control station 10 starts control for establishing the second radio link. The control station 10 determines the slot and frequency for the second radio link, and notifies the first base station 13 of it. At this time, a slot other than the slot used for communication between the first base station 13 and the radio telephone 12 is designated as the designated slot. Further, the control station 10 receives the synchronization signal for the second radio link from the radio telephone 12 to the second base station 14 and the third base station 15 for the second radio link. The second base station 14 and the third base station 15 start reception using the frequency specified in the specified slot. The first base station 13 notifies the radio telephone 12 of the slot and frequency notified from the control station 10 in the control data area of the communication slot. When the radio telephone 12 is notified of the slot and frequency for the second radio link, the radio telephone 12 transmits a synchronization signal for starting communication using the frequency notified in the notified slot, and at the same time, the corresponding reception slot Reception starts using the frequency specified in. When the second base station 14 and the third base station 15 receive the synchronization signal from the wireless telephone 12, the second base station 14 and the third base station 15 notify the control station 10 of the reception quality of the received signal. The control station 10 compares the reception qualities sent from the second base station 14 and the third base station 15 and starts communication with the radio telephone 12 for the base station with the higher reception quality. Give instructions. Here, the operation when the reception quality notified from the second base station 14 is high will be described. When the second base station 14 is instructed by the control station 10 to start communication with the radiotelephone 12, the second base station 14 was notified first in the transmission slot corresponding to the slot receiving the synchronization signal from the radiotelephone 12. The transmission of the synchronization signal is started using the frequency for the second radio link, whereby the radio link between the radio telephone 12 and the second base station 14 is established.

  In parallel with the operation of establishing the second radio link, call control protocols are exchanged among the control station 10, the first base station 13, and the radio telephone 12. With this call control protocol, the wireless telephone 12 is notified that the current call is an incoming voice call from the wired telephone 11, performs control such as ringing, and notifies the user of the incoming call. When the user responds to an incoming call by operating the response button of the radio telephone 12, etc., the radio telephone 12 activates the voice circuit and shifts to a call state, and at the same time controls the call slot (slot containing at least voice data). An incoming response message is put on the data, and the incoming response is notified to the control station 10 via the first base station 13. The control station 10 notified of the incoming call response activates the voice circuit and shifts to a call state.

  Next, the operation during a call state will be described.

  The analog audio signal from the wired telephone 11 is converted by the control station 10 into a sequence of audio data to be transmitted in one slot every frame, and the first base station 13 and the second base station together with the control data as necessary. It is sent to the base station 14. In the first base station 13 and the second base station 14, when there is control data, the control data and voice data are combined to perform CRC calculation, and transmitted to the radio telephone 12 with the data configuration shown in FIG. If there is no data, the control data is converted into idle data indicating that there is no control data, combined with the voice data, CRC calculation is performed, and the data structure shown in FIG. The radio telephone 12 sequentially receives signals transmitted from the first base station 13 and the second base station 14, and performs reproduction or mute processing of audio data while determining the presence or absence of a reception error. That is, when the wireless telephone 12 receives the transmission data from one of the first base station 13 or the second base station 14 transmitted in the preceding slot in one frame, the wireless telephone 12 converts the CRC data of the received data. Based on this, it is determined whether or not there is a reception error, and if there is no reception error, the audio data of the received data is sent to the audio processing unit to perform reproduction processing. Subsequently, transmission data is received from the other base station. If the preceding slot is a reception error, the presence / absence of a reception error is similarly determined based on the CRC data of the reception data. If there is no reception error, the audio data of the received data is sent to the audio processing unit. If the preceding slot is not a reception error, the reception error is not judged and the audio data is not sent again to the audio processing unit. The audio processing unit temporarily stores the audio data sent in one frame, and sequentially reproduces the audio data at the timing of starting the next frame. If both the received data from the first base station 13 and the second base station 14 in one frame are reception errors, the received data is not sent to the audio processing unit in the corresponding frame, so that the audio processing The unit controls to mute the reproduced sound.

The analog voice signal from the radio telephone 12 is converted into a voice data string to be transmitted in one slot for each frame by the voice processing unit of the radio telephone 12, and CRC is added together with control data as necessary. And sent to the first base station 13 and the second base station 14. At this time, the same data is transmitted as the audio data portion of the signal transmitted to each base station within one frame. The first base station 13 and the second base station 14 determine the presence / absence of a reception error based on the CRC data of the received data. If there is no reception error, the voice data of the received data is sent to the control station 10. If there is a reception error, mute audio data is sent to the control station 10 instead of the received audio data. The control station 10 temporarily stores the audio data sent in one frame, sequentially converts the audio data to analog at the timing of the start of the next frame, and outputs it to the wired telephone 11. At this time, if both audio data from the first base station 13 and the second base station 14 in one frame are audio data for mute, the wired telephone 11 receives an analog signal ( If the AC component is 0V) and one of the received data from the first base station 13 and the second base station 14 is audio data for mute, the audio that is not audio data for mute Data is converted into an analog signal and output to the wired telephone 11. Also, if both audio data from the first and second base stations 13 and 14 are not mute audio data, the audio data sent from either one of the base stations is converted into an analog signal. Output to the wired telephone 11.

  In the present embodiment, two sub base stations 14 and 15 are used. However, the number of sub base stations 14 and 15 may be three or more, and the number of sub base stations to be selected may be one or two or more.

  As described above, according to the present embodiment, a plurality of sub radio communication systems capable of communicating with the main radio communication system (12, 13) and the radio communication terminal 12 in the main radio communication system (12, 13). (12, 14, 15), a radio communication system comprising a control station 10 for controlling a main radio communication system (12, 13) and a plurality of sub radio communication systems (12, 14, 15). The station 10 forms a plurality of radio communication paths together with the main radio communication system (12, 13) based on the quality of the received signal from the radio communication terminal 12 in the plurality of sub radio communication systems (12, 14, 15). By selecting a wireless communication system (for example, the system (12, 14)), one signal is transmitted / received via different propagation paths, and a received signal having a good quality is selected from a plurality of received signals. It is possible to it is possible to prevent deterioration of reception quality due to propagation path failure.

  Also, one main base station 13, two sub base stations 14 and 15, a radio telephone 12 capable of communicating with the main base station 13 and the sub base stations 14, 15, a main base station 13 and a sub base station 14, The control station 10 performs communication between the two sub-base stations 14 and 15 and the radio telephone 12 via the main base station 13, and the control station 10 controls the radio telephone 12. The quality of the received signal from the radio telephone 12 in the two sub base stations 14 and 15 is compared, the sub base station with the higher quality is selected, and the sub base station with the higher quality between the main base station and the radio telephone 12 is selected. When transmitting a signal from the wireless telephone 12 to the base station by communicating with the wireless telephone 12 using two wireless communication paths with the base station, the signal is transmitted and received between the wireless telephone 12 and the main base station 13. In addition to the radio telephone 12 selected Since signals can be transmitted and received between the base stations, the control station 10 compares the received signal between the radio telephone 12 and the main base station 13 with the received signal between the radio telephone 12 and the sub base station, A good signal can be selected, and deterioration of the reception quality of the signal from the radio telephone 12 in the base station can be prevented.

  Further, one main base station 13, first to n-th (n is a natural number of 2 or more) sub-base stations, a radio telephone 12 capable of communicating with the main base station 13 and the sub-base stations, and the main base station 13 And a control station 10 that controls the sub-base station, wherein the control station 10 communicates with the first to n-th sub-base stations and the radio telephone 12 via the main base station 13. The quality of the received signal from the radiotelephone 12 in the first to nth subbase stations is compared, the subbase station having the highest quality or a plurality of subbase stations is selected in order of quality, and the radiotelephone 12 Between the main base station 13 and the selected sub-base station having the highest quality or a plurality of selected sub-base stations using two wireless communication paths or three or more wireless communication paths. By using communication, two or more wireless communication channels are used. Since transmission / reception between the radio telephone 12 and the base station can be performed, it is possible to compare the reception signals in the respective radio communication paths with each other, and to prevent deterioration of the reception quality of the signal from the radio telephone 12 in the base station. it can.

(Embodiment 2)
FIG. 3 is a block diagram showing a parent device and a child device constituting the wireless communication system according to the second embodiment of the present invention.

In FIG. 3, 100 is an antenna for transmitting and receiving radio signals, 101 is a transmitter for generating radio signals, 102 is a voice signal and control data for transmission, and a synchronization signal and CRC for error detection are added to the TDMA transmission timing. In addition, a transmission data processing unit that generates transmission data, 103 is a transmission data storage unit that stores audio transmission data, 104 is a transmission audio processing unit that converts an analog audio signal into audio data for digital transmission, and 105 is A microphone for inputting an audio signal, 111 a receiving unit that receives and demodulates a radio signal and simultaneously detects a reception level, 112 detects a synchronization signal from the received demodulated signal, and detects CRC for audio data, control data, and error detection Is a received data processing unit that performs error detection, and 113 is a received data storage unit that stores received audio data. 4 is a received voice processing unit that converts a received digital voice signal into an analog voice signal, 115 is a speaker that outputs the voice signal, 130 is an operation unit that inputs a telephone number when making a call, and responds to an incoming call, 140 Is a display unit that displays an input telephone number or that a call is being received, and 150 is a control unit that controls the entire apparatus. Here, the transmission unit 101 and the reception unit 111 constitute a radio unit.

  In the second embodiment, all of the slave units that operate as the master unit, the slave units, and the repeaters (relay units) are realized with the same configuration as that of FIG.

  FIG. 4 is a block diagram showing an example of a wireless communication system according to Embodiment 2 of the present invention, and shows wireless connection between the parent device and each child device. FIG. 4 shows the configuration of the master unit 4 and the slave units 1 to 3, performs voice communication between the master unit 4 and the slave unit, performs direct wireless communication between the master unit 4 and the slave unit 1, and at the same time as a repeater The example which performs radio | wireless communication between the main | base station and the subunit | mobile_unit 1 via the subunit | mobile_unit 2 which operate | moves is shown.

  FIG. 5 is a timing diagram showing slot timings of transmission / reception at the start of a call between parent device 4 and child device 1 in the wireless communication system according to the second embodiment of the present invention. FIG. 5 shows an example of communication by TDMA in which one frame is divided into eight slots and transmission / reception is performed.

  FIG. 6 is a timing chart showing slot timings of transmission / reception at the start of a call between base unit 4 and handset 1 and another handset 2 operating as a repeater in the wireless communication system according to Embodiment 2 of the present invention.

  FIG. 7 is a timing chart showing slot timings of transmission / reception during a call between the parent device 4, the child device 1, and another child device 2 operating as a repeater in the wireless communication system according to the second embodiment of the present invention.

  FIGS. 8A and 8B are data format diagrams showing a data structure of a communication slot used during communication between the parent device 4, the child device 1, and the repeater in the wireless communication system according to the second embodiment of the present invention. FIG. 8A shows a data configuration during voice communication, and FIG. 8B shows a data configuration of a control slot and a synchronization slot used when a call slot is activated.

  Hereinafter, the operation of the radio communication system according to the present embodiment will be described with reference to the drawings.

  First, the standby operation will be described. During standby, the base unit 4 periodically transmits control data at a control frequency. That is, the control unit 150 of the base unit 4 periodically controls the transmission unit 101 to transmit at the control frequency, and the transmission identification process and the control data, which are identification codes for the base unit 4, are transmitted. The transmission data processing unit 102 generates a bit string having a data structure shown in FIG. 8B by combining the origination identification code and the control data with the synchronization signal and the CRC data calculated from the origination identification code and the control data. Generate and send to the transmission unit 101. The transmission unit 101 converts the received bit string into a radio signal having a frequency designated by the control unit 150 and transmits the radio signal via the antenna 100. Further, the control unit 150 controls the reception unit 111 to receive transmission of control data from the slave unit in a reception slot corresponding to a slot for transmitting the control slot. The data received and demodulated by the reception unit 111 is sent to the reception data processing unit 112, and the reception data processing unit 112 detects the synchronization signal, separates the identification code and control data, and detects the presence or absence of a reception error. When the control data is normally received, the received control data is notified to the control unit 150.

  While waiting, each slave unit periodically receives control data transmitted from the master unit 4 and monitors the presence or absence of a call from the master unit 4 while synchronizing TDMA slots. That is, first, the control unit 150 of the slave unit controls the reception unit 111 to continuously receive at the control frequency in order to synchronize with the transmission timing of the control data of the master unit 4. The data received and demodulated by the reception unit 111 is sent to the reception data processing unit 112. The reception data processing unit 112 detects the synchronization signal, separates the originating identification code from the control data, and detects whether there is a reception error. When the call identification code and control data are normally received, the received control data is notified to the control unit 150. The control unit 150 analyzes the control data, and if the received call identification code is a signal from the base unit 4 that it is waiting for, the control unit 150 stores and holds the reception timing. As in the case of the continuous reception described above, the reception unit 111 and the reception data processing unit 112 are controlled to receive control data from the parent device 4 so that reception is performed in accordance with the transmission timing of control data.

  Next, an operation of making a call from the parent device 4 to the child device and making a call will be described. Here, an example in which the child device 1 is called from the parent device 4 will be described. When the operation unit 130 of the parent device 4 is used to call the child device 1 and the control unit 150 detects it, the calling of the child device 1 is started with the control data. That is, the control unit 150 transmits a message for notifying the handset 1 of an incoming call on the control data in the data sequence of the control slot configured as shown in FIG. Do. The subunit | mobile_unit 1 has received control data regularly, and when the message which notifies an incoming call to itself is received, the control part 150 of the subunit | mobile_unit 1 respond | corresponded to the receiving slot of the control slot from the main | base station 4. A response to the incoming call notification is sent to the base unit 4 in the transmission slot. That is, the control unit 150 of the slave unit 1 notifies the transmission data processing unit 102 of a response message for an incoming call sent with its own call identification code and control data from the base unit 4, and the transmission data processing unit 102 A bit string having the data structure shown in FIG. 8B is generated by combining the control data with CRC data calculated from the synchronization signal, the originating identification code, and the control data, and sent to the transmitter 101. The transmission unit 101 converts the received bit string into a radio signal having a frequency designated by the control unit 150 and transmits the radio signal via the antenna 100.

  When the base unit 4 receives a response to the incoming call notification from the handset 1, it communicates with the control data in the control slot in the data configuration of FIG. 8B in the same manner as when the incoming call is notified. The slot information and the frequency information are transmitted to the slave unit 1 and reception of the designated slot is started. When receiving the communication slot and frequency, the control unit 150 of the slave unit 1 controls the transmission data processing unit 102 and the transmission unit 101 so as to start transmission for synchronization at the designated slot and the designated frequency. At the same time, the reception data processing unit 112 and the reception unit 111 are controlled to receive a communication slot from the parent device 4. At this time, the data sequence transmitted from the slave unit 1 to the master unit 4 in the communication slot uses the data sequence having the data configuration shown in FIG. 8B in order to establish synchronization in the new slot. Includes control data indicating that the data string is data for synchronization.

  In base unit 4, reception of a communication slot is started, and when control data indicating that it is data for synchronization with the originating identification code of handset 1 is received from the received data, communication is performed in the same manner as handset 1. Transmission of data for synchronization is started in the slot. When the slave unit 1 receives the synchronization data from the master unit 4, the data sequence in the communication slot is changed to the data sequence shown in FIG. 8A and communication is continued. When the master unit 4 receives a slot in which the data sequence of the communication slot sent from the slave unit 1 is changed to the data configuration of FIG. 8A, the data sequence to be transmitted is changed to the data configuration of FIG. The communication is continued and the activation of the communication slot between the master unit 4 and the slave unit 1 is completed.

As described above, when the wireless link of the communication slot between the parent device 4 and the child device 1 is established, the exchange of the call control sequence is started. The control data for call control between the master unit and the slave unit 1 is shown in FIG.
This is performed using the control data portion of the data structure of (a). First, control data for instructing start of voice communication is sent from the master unit 4 to the slave unit 1. In the handset 1, when the control data for starting the voice communication is received and transmitted to the control unit 150, the control unit 150 notifies the user of an incoming call by ringing a ringer so as to notify the user of the incoming call on the display unit 140. Do. When the user performs an operation to respond to an incoming call using the operation unit 150 and the control unit 150 detects, the control unit 150 activates the transmission voice processing unit 104 and the reception voice processing unit 114 to open a voice path, and at the same time, 4 sends a response message. The base unit 4 that has received the response message also activates the transmission voice processing unit 104 and the reception voice processing unit 114 to open a voice path and start a voice call in the same manner as the handset 1.

  FIG. 5 shows an operation example from notification of an incoming call from the parent device 4 to the child device 1 until the communication slot is activated. In FIG. 5, one frame is divided into eight slots, the first slot serving as a control transmission slot from the parent device 4 to each child device, and the first transmission slot serving as a control transmission from each child device to the parent device 4. In the example, communication slots are activated in the second and sixth slots between the master unit 4 and the slave unit 1 using five slots.

  First, in frame 1, the control data for notifying the incoming call is transmitted from the master unit 4 in the first slot for control, and the slave unit 1 that has received the response responds in the fifth slot for control. Receives the response from handset 1. In frame 2, base unit 4 transmits a message specifying the second and sixth slots as communication slots in the first slot for control, and at the same time, receives data for synchronization from slave unit 1 in the sixth slot. Start receiving. When receiving a message designating the second and sixth slots as communication slots in the first slot, the slave unit 1 starts transmission of a data string for synchronization in the sixth slot, and receives the second slot from the next frame. Start. In frame 3, in response to reception of synchronization data from slave unit 1 in the sixth slot of frame 2, master unit 4 starts transmitting synchronization data in the second slot. Receiving the synchronization data, handset 1 starts transmitting a voice call data string having the data structure shown in FIG. 8A in the sixth slot. In frame 4, in response to the reception of voice call data from slave unit 1 in the sixth slot of frame 3, the master unit 4 also uses the second slot for voice call having the data configuration shown in FIG. Is started, and communication for a voice call between the parent device 4 and the child device 1 is established.

  Next, after the master unit 4 and the slave unit 1 shift to the communication state, an operation for starting a new communication slot via another slave unit will be described.

As described above, after the activation of the communication slot for performing direct communication is completed between the parent device 4 and the child device 1, the operation of starting a new communication slot via another child device is activated. Here, the data received from the antenna 100 is subjected to synchronization detection, data separation, error determination in the received data processing unit 112, and the transmission identification code and control notified from the control unit 150 to the transmission data processing unit 102. A detailed operation of each block that generates a transmission data string by attaching a CRC or the like from the data and is transmitted from the transmission unit 101 via the antenna 100 is the same as that described above, and is omitted. First, the master unit 4 transmits control data for instructing a repeater operation to the slave unit 2 and the slave unit 3 waiting in a control slot. At this time, the slave 1 that has established communication with the control data is notified of the slot and frequency for transmission, and the slave 1 is in communication with the slave that operates as a repeater. The frequency is indicated. The subunit | mobile_unit 1 starts transmission in the designated slot of the data string for the synchronization of the frequency instruct | indicated from the main | base station 4. FIG. Then, the slave unit 2 and the slave unit 3 that are on standby start receiving the slot designated by the master unit 4 using the designated frequency. When the slave unit 2 and the slave unit 3 receive the synchronization data of the slave unit 1, the reception level is detected by the reception unit 111 and the reception level is notified to the master unit 4 using the control slot. The control unit 150 of the parent device 4 compares the reception levels notified from the child devices 2 and 3, and instructs the child device having a higher reception level to start communication with the child device 1. . In the case where the reception level of the slave unit 2 is high as an example, control data for instructing the start of communication with the slave unit 1 in the control slot is transmitted from the master unit 4 to the slave unit 2. In accordance with the instruction, slave unit 2 starts transmission of synchronization data to slave unit 1 in a slot corresponding to the slot receiving synchronization data of slave unit 1. When receiving the synchronization data from the slave unit 2, the slave unit 1 changes the data sequence of the transmission slot to the slave unit 2 to the data sequence for voice communication in FIG. When the data sequence received from the slave unit 1 is changed to the data sequence for voice communication shown in FIG. 8A, the slave unit 2 changes the data sequence transmitted by itself to the data sequence for voice communication shown in FIG. The communication slot between the handset 1 and handset 2 is activated. Then, the slave unit 1 notifies the master unit 4 that the connection with the slave unit 2 has been completed.

  The master unit 4 starts the communication slot activation operation between the parent device 4 and the child device 2 in parallel with the communication slot activation operation between the child device 1 and the child device 2. The master unit 4 notifies the slave unit 2 of the slot for communicating with the master unit 4 and the slave unit and the frequency in the control slot, and the slave unit 2 is synchronized using the frequency specified in the designated slot. Start sending data for use. Thereafter, the operation of starting the communication slot between the parent device 4 and the child device 2 is performed in the same manner as the operation of starting the communication slot between the parent device 4 and the child device 1 described above. The communication slot is activated. When the activation of the communication slot between the parent device 4 and the child device 2 is completed, the parent device 4 notifies the child device 1 that the activation of the communication slot between the parent device 4 and the child device 2 is completed.

  Next, referring to FIG. 6, how the communication slots of the parent device 4 and the child device 2 and the child device 1 and the child device 2 are activated will be described. In FIG. 6, the first slot is used for transmission of the control slot from the parent device 4 to the child device, the fifth slot is used for transmission of the control slot from the child device to the parent device 4, and the parent device 4 and the child device are used. 1 shows a state in which the parent device 4 and the child device 1 start a new communication slot with the child device 2 from the state in which communication is already performed using the second slot and the sixth slot.

In FIG. 6, first, in frame 1, the slave unit 2 and the slave unit 3 that are the slave units waiting from the master unit 4 in the first control slot are instructed to receive the synchronization data of the slave unit 1. Control data indicating information on the notification to be performed and the slot and frequency used at that time are transmitted, and the slave unit 2 and the slave unit 3 that have received the control data transmit the designated slot (in the example of FIG. Slot). The master unit 4 also notifies the slave unit 1 to instruct the transmission of data for synchronization to other slave units in the control data portion in the second slot in communication with the data configuration of FIG. Then, the control data indicating the slot and frequency information used at that time is transmitted, and the slave unit 1 that has received the control data transmits the specified slot (seventh slot in the example of FIG. 6) in FIG. ) Start transmission of data for synchronization of the data structure. Further, when the slave unit 2 and the slave unit 3 receive the synchronization data from the slave unit 1 in the seventh slot, the reception level at that time is detected and stored. In frame 2, the reception level of the synchronization data of slave unit 1 received in frame 1 is notified from slave unit 2 to base unit 4 in the fifth slot for control. Similarly, in frame 3, the reception level of the synchronization data of slave unit 1 received in frame 1 is notified from slave unit 3 to base unit 4 in the fifth slot for control. In frame 4, base unit 4 compares the reception levels of handset 1 notified from handset 2 and handset 3, and handset 1 in the first slot for the handset with the higher reception level. Control data indicating the start of communication with the base unit 4 and control data indicating information on the slot and frequency used for communication with the base unit 4 are transmitted, and reception of the designated slot is started (in FIG. An example in which an instruction to start communication with the child device 1 and control data using the slot 4 and the slot 8 for communication with the parent device 4 is issued to the device 2 is shown). Upon receiving the notification, the slave unit 2 starts transmission of synchronization data to the slave unit 1 in the slot 3 and starts transmission of synchronization data to the master unit 4 in the slot 8. Further, the slave unit 1 that has received the synchronization data from the slave unit 2 in the third slot changes the data to be transmitted in the seventh slot to the voice communication data shown in FIG. In frame 5, base unit 4 receives the synchronization data from slave unit 2 in the eighth slot of frame 4, and starts transmitting synchronization data to slave unit 2 in the fourth slot. Further, the slave unit 2 receives the data for voice communication from the slave unit 1 in the seventh slot of the frame 4 and transmits the data to be transmitted to the slave unit 1 in the third slot as shown in FIG. Change to communication data, complete activation of communication slot between handset 1 and handset 2, receive data for synchronization from base unit 4 in the fourth slot, and transmit in the eighth slot The data is changed to data for voice communication shown in FIG.

  Thereafter, when the base unit 4 receives the data for voice communication in the eighth slot from the handset 2, the data to be transmitted to the handset 2 in the fourth slot is changed to the data for voice communication shown in FIG. Then, activation of the communication slot between the parent device 4 and the child device 2 is completed (not shown).

  Next, the master unit 4 and the slave unit 1 perform voice communication while the master unit 4 and the slave unit 1 communicate directly via the slave unit 2 that is another slave unit. The operation in this case will be described.

  The audio signal input from the microphone 105 of the parent device 4 and the child device 1 is converted into a digital signal by the audio processing unit 104 and sent to the transmission data storage unit 103. The transmission data storage unit 103 combines the digitally converted audio data with the synchronization data and the control data in units of frames, adds a CRC calculated from the control data and the audio data, and outputs the CRC to the transmission unit 101. Here, the master unit 4 and the slave unit 1 have the same voice in both the slot in which the master unit 4 and the slave unit 1 communicate with each other and the slot in which the master unit 4 and the slave unit 1 communicate with the slave unit 2 in the same frame. The transmission data storage unit 103 generates transmission data so as to transmit data, sends the transmission data to the transmission unit 101, and two wireless signals including the same audio data are transmitted in one frame.

  In the slave unit 2 operating as a repeater, the signals transmitted from the master unit 4 and the slave unit 1 are received and demodulated by the reception unit 111 and sent to the reception data processing unit 112. The reception data processing unit 112 detects a reception error based on the CRC data of the reception data. When there is no reception error, the received audio data is output to the reception data storage unit 113, and there is a reception error. Outputs the mute data instead of the received audio data to the reception data storage unit 113, and the audio data received from the parent device 4 and the child device 1 is stored in the reception data storage unit 113. The transmission data storage unit 103 reads the audio data stored in the reception data storage unit 113, combines it with the synchronization data and the control data in units of frames, attaches a CRC calculated from the control data and the audio data, and sends it to the transmission unit 101. Output. At this time, control is performed so that the audio data received from the child device 1 is transmitted to the parent device 4 and the sound data received from the parent device 4 is transmitted to the child device 1.

  Next, the audio signal reception operation of the master unit 4 and the slave unit 1 will be described. A radio signal received via the antenna 100 is received and demodulated by the reception unit 111 and sent to the reception data processing unit 112. The reception data processing unit 112 detects the synchronization data, separates the control data, the voice data, and the CRC, detects an error in the reception data based on the CRC, and if there is no reception error, the received voice data Is output to the received data storage unit 113. If there is a reception error, the mute data is output to the received data storage unit 113 instead of the received audio data, and the received audio data is output to the received data storage unit 113. Remembered. The reception data storage unit 113 can store the audio data received in the four slots, and the audio data received from the parent device 4 or the child device 1 and the audio data received from the child device 2 in the latest frame Are controlled so as to store the audio data of the two slots, that is, the audio data received from the parent device 4 or the child device 1 and the audio data received from the child device 2 in the previous frame. Done. The reception audio processing unit 114 reads the data in the reception data storage unit 113 at the head of each frame, converts it into an analog signal, and outputs it to the speaker 115. At this time, the reception audio processing unit 114 first reads out the audio data storing the audio data received from the child device 2 in the immediately previous frame (latest frame), and if it is not mute data, received from the child device 2 If the audio data is converted into an analog signal and output, and if it is mute data, the audio data stored in the audio data received from the parent device 4 or the child device 1 received in the previous frame is read out. Convert to analog signal and output.

  In the above description, the example in which the timing for reading the data stored in the received data storage unit 113 is set to the head of the frame has been shown. A method of reading the data stored in the received data storage unit 113 immediately after the end of reception and performing conversion processing to an analog signal is also possible.

  Next, the operation during voice communication will be described with reference to FIG.

  In FIG. 7, transmission from the parent device 4 to the child device 1 is performed in the second slot, and transmission from the parent device 4 to the child device 2 performing the relay operation is transmitted from the child device 1 to the parent device 4 in the fourth slot. In the sixth slot, transmission from the slave unit 1 to the slave unit 2 performing the relay operation is performed in the seventh slot, and transmission from the slave unit 2 performing the relay operation to the master unit 4 is performed in the eighth slot. In the example, transmission from the slave unit 2 to the slave unit 1 is performed in the third slot. In the frame 1, the audio signal from the parent device 4 is sent to the child device 1 in the second slot and to the child device 2 in the fourth slot. The audio data of these two slots is the same data. The slave unit 2 that performs the relay operation transmits the audio data of the signal received in the fourth slot of the frame 1 to the slave unit 1 in the third slot of the frame 2. That is, when all communications from the master unit 4 to the slave unit 1, from the master unit 4 to the slave unit 2, and from the slave unit 2 to the slave unit 1 are normally performed without receiving errors, the second slot of the frame 1 of the slave unit 1 And the audio data of the third slot of the second frame are the same data.

  When all communication from the master unit 4 to the slave unit 2 and from the slave unit 2 to the slave unit 1 is performed normally without receiving errors, the slave unit 1 receives the audio from the slave unit 2 after the reception from the slave unit 2 is completed. The operation of converting data into an analog signal is started. In the case where either one or both of the master unit 4 to the slave unit 2 and the slave unit 2 to the slave unit 1 has a reception error and the reception data in the third slot of the frame 2 is mute data, the slave unit 2 The operation of converting the reception data of the second slot of frame 1 into an analog signal is started at the same timing as when there is no error after the reception from the terminal. Here, when the communication from the parent device 4 to the child device 1 is a reception error and the reception data in the second slot of the frame 1 is also mute data, the audio signal is muted.

  Audio data from the child device 1 to the parent device 4 is processed in the same manner. That is, the slave unit 1 transmits the same audio data in the sixth slot and the seventh slot of the frame 1, and is transmitted via the slave unit 2 and the reception data of the sixth slot of the frame 1 on the master unit 4 side. Using the received data of the eighth slot of frame 2 that has been received, one is selected in the same manner as in the case of handset 1 to reproduce the audio data. That is, the master unit 4 and the slave unit 1 receive both the voice data communicated directly between the master unit 4 and the slave unit 1 and the voice data communicated via the slave unit 2, and perform the relay operation. The received voice data is stored in consideration of the delay of the voice data, and when the voice data that has been relayed and sent is received, if the voice data that has been relayed is normally received, it is reproduced as it is, If it is a reception error, the stored voice data that has been directly sent is played back. Thereby, if either one is normally received, it becomes possible to communicate without interruption of sound.

As described above, according to the present embodiment, the wireless communication system includes the parent device 4 and the child device that perform communication using the TDMA method, and the relay device that relays wireless communication between the parent device and the child device. The base unit 4 includes wireless units 101 and 111 that perform wireless transmission / reception using the TDMA method, and transmission data that generates data sequences to be transmitted in each slot by adding error detection data and synchronization data to the transmission data. A processing unit 102; a reception data processing unit 112 that extracts reception data and error detection data from the reception signal of each slot received and demodulated by the radio units 101 and 111, and detects whether there is a reception error in the reception data of each slot; The slave unit 1 includes a control unit 150 that performs control so that data having no reception error is selected and processed based on the error detection result in the reception data processing unit 112. Radio unit for transmitting and receiving wirelessly TDMA system 101,11
1, a transmission data processing unit 102 that adds data for error detection and synchronization data to transmission data to generate a data string to be transmitted in each slot, and each slot received and demodulated by the radio units 101 and 111 Received data and error detection data are extracted from the received signal and the received data processing unit 112 detects whether or not there is a reception error in the received data of each slot, and data that has no reception error based on the error detection result in the received data processing unit 112 The repeater 2 includes radio units 101 and 111 that perform radio transmission / reception by the TDMA method, and data for error detection and synchronization with transmission data. Transmission data processing unit 102 for generating a data string to be transmitted in each slot by adding data for use, and radio units 101 and 111 for reception recovery. Received data and error detection data are extracted from the received signal of each slot, and the received data processing unit 112 that detects the presence or absence of a reception error of the received data of each slot, and the received data from the parent device 4 are transmitted to the child device 1 And a control unit 150 that performs control to transmit data received from the slave unit 1 to the master unit 4, so that the master unit 4 and the slave unit 1 can communicate with each other when communicating between the master unit 4 and the slave unit 1. Since signals can be transmitted and received simultaneously via the repeater 2 while transmitting and receiving signals directly between them, it becomes possible to communicate between the master unit 4 and the slave unit 1 using two propagation paths. It is possible to select a signal with good reception status in both the master unit 4 and the slave unit, and it is possible to prevent deterioration in reception quality even if the radio state between the master unit 4 and the slave unit deteriorates. Communicate by TDMA method Accordingly, the wireless units 101 and 111 of the master unit 4 and the slave unit 1 can perform a plurality of wireless communications with the single wireless unit 101 and 111, and wirelessly directly between the master unit 4 and the slave unit 1 with a simple circuit configuration. It is possible to perform transmission / reception via the repeater 2 while performing transmission / reception.

  In addition, the wireless communication system includes a parent device 4 and a child device 1, and a relay device 2 that relays wireless communication between the parent device 4 and the child device 1, and the parent device 4 or the child device 1 is the own device or the other device. Is started to communicate with the slave unit 1 or the master unit 4, and then the master unit 4 starts communication with the relay unit 2 and the slave unit 1 starts communication with the relay unit 2, Reference numeral 4 compares the received signal from the slave unit 1 and the received signal from the repeater 2 and selects the better received data for reception processing. The slave unit 1 receives the received signal from the master unit 4 and the repeater By comparing the received signals from 2 and selecting the better received data and receiving processing, a direct signal is transmitted between the master unit 4 and the slave unit 1 during communication between the master unit 4 and the slave unit 1. Since signals can be transmitted and received simultaneously via the repeater 2 while transmitting and receiving, communication between the master unit 4 and the slave unit 1 using two propagation paths It becomes possible, and it becomes possible to select a signal with a good reception state in both the master unit 4 and the slave unit, and even if the radio state between the master unit 4 and the slave unit 1 deteriorates, it is possible to prevent the degradation of the reception quality. It becomes.

  Furthermore, the wireless communication system includes a parent device 4 and a child device 1, and at least one relay device 2 that relays wireless communication between the parent device 4 and the child device 1. Starts communication with the slave unit 1 or the master unit 4 by a call from the own unit or the partner unit, the relay unit transmits a signal that can be received by the slave unit, and the slave unit 1 receives the transmission signal of the relay unit Then, the quality of the received signal is detected, a relay device having a good reception quality is selected based on the quality of the received signal, communication with the selected relay device is started, and the base unit 4 is connected via the selected relay device. The master unit 4 compares the received signal from the slave unit 1 with the received signal from the relay unit, selects the better received data, and performs a reception process. By comparing the received signal from the machine 4 with the received signal from the repeater and selecting the better received data, When communicating between the slave unit 4 and the slave unit 1, the master unit 4 and the slave unit 1 transmit and receive signals directly via the repeater while simultaneously transmitting and receiving signals between the master unit 4 and the slave unit 1, using two propagation paths. Communication between the master unit 4 and the slave unit 1 becomes possible, and it becomes possible to select a signal having a good reception state in both the master unit 4 and the slave unit 1, and the radio state between the master unit 4 and the slave unit 1 deteriorates. However, it is possible to prevent deterioration of the reception quality, and the optimum repeater is selected based on the reception state of the transmission signal from the repeater received by the slave unit 1 and the optimum repeater is passed through. Communication between the parent device 4 and the child device 1 becomes possible, and the reception quality can be improved.

Further, at least one relaying wireless communication between the parent device 4 and the child device 1, and between the parent device 4 and the child device 1.
A wireless communication system including two relay devices, wherein the parent device 4 or the child device 1 starts communication with the child device 1 or the parent device 4 by a call from the own device or the partner device, and the child device 1 is the relay device The repeater receives the transmission signal of the slave unit 1 to detect the quality of the received signal, and the slave unit 1 relays the one having the better reception quality based on the quality of the received signal. A communication device is selected, communication with the selected relay device is started, communication with the master device 4 is started via the selected relay device, and the master device 4 receives the received signal from the slave device 1 and the selected relay device. Compared with the received signal from the receiver, the reception data of the better one is selected and received, and the slave unit 1 compares the received signal from the master unit 4 with the received signal from the selected repeater. By selecting the received data and processing the received data, the communication between the master unit 4 and the slave unit 1 is performed directly between the master unit 4 and the slave unit 1. Since the signal can be transmitted and received simultaneously via the repeater while transmitting and receiving the signal, communication between the master unit 4 and the slave unit 1 becomes possible using two propagation paths. It is possible to select a signal having a good reception state in both of them, and even if the wireless state between the parent device 4 and the child device 1 deteriorates, it is possible to prevent the reception quality from being deteriorated. The optimal repeater is selected based on the reception status of the transmission signal from the slave unit 1 to enable communication between the master unit 4 and the slave unit 1 via the optimal repeater, and to improve the reception quality. Can be planned.

  Furthermore, a wireless communication system comprising a parent device 4 and a child device 1 that perform communication using the TDMA system, and at least one relay device that relays wireless communication between the parent device 4 and the child device 1, The master unit 4 or the slave unit 1 starts communication with the slave unit 1 or the master unit 4 by calling from the own unit or the partner unit, and the master unit 4 is used for the start of communication between the slave unit 1 and the relay unit. The slave unit 1 and the relay unit are instructed to the slave unit 1 and the relay unit. The slave unit 1 transmits a signal to the relay unit in the slot designated by the master unit 4. Is received, the reception quality of the transmission signal from the slave unit 1 is detected, and the reception quality is notified to the base unit 4. The base unit 4 relays based on the reception quality notified from each relay unit Select the machine, instruct the selected relay machine to start communication with the slave unit 1, and instruct the selected relay machine and slave unit 1 from the master unit 4 The base unit 4 compares the received signal from the handset 1 with the received signal from the selected repeater, selects the better received data, and performs reception processing. The machine 1 compares the received signal from the master unit 4 with the received signal from the selected repeater, selects the better received data, and receives the processed data, so that the master unit 4 and the slave unit 1 are connected. During communication, signals can be directly transmitted and received between the master unit 4 and the slave unit 1 and simultaneously transmitted / received via the repeater, so the master unit 4 and the slave unit can be transmitted using two propagation paths. 1 can communicate with each other, and it is possible to select a signal with a good reception state in both the parent device 1 and prevent deterioration in reception quality even if the wireless state between the parent device 4 and the child device 1 deteriorates. Based on the reception status of the transmission signal from the slave unit 1 received by the relay unit. By selecting an appropriate repeater, communication between the master unit 4 and the slave unit 1 via the optimal repeater becomes possible, and the reception quality can be improved. By specifying the slot to be used between the repeaters, it is possible to manage the slots used in the system in the master unit 4 and to perform efficient slot allocation operation.

Furthermore, a wireless communication system comprising a parent device 4 and a child device 1 that perform communication using the TDMA system, and at least one relay device that relays wireless communication between the parent device 4 and the child device 1, The master unit 4 or the slave unit 1 starts communication with the slave unit 1 or the master unit 4 by calling from the own unit or the partner unit, and the master unit 4 is used for the start of communication between the slave unit 1 and the relay unit. The relay unit transmits a signal to the slave unit 1 in the slot designated by the master unit 4, and the master unit 4 transmits the transmission signal from the relay unit to the slot designated by the master unit 4. The slave unit 1 receives the signal from the relay unit, detects the reception quality, and selects the relay unit based on the reception quality of the transmission signal transmitted from each relay unit. Select and start communication with the selected repeater, the selected repeater starts communication with the master unit 4, and the master unit 4 The reception signal from unit 1 is compared with the reception signal from the selected repeater, and the better received data is selected for reception processing. Slave unit 1 receives the received signal from base unit 4 and the selected relay Compared with the received signal from the machine, select the better received data and perform reception processing, so that when the communication between the parent machine 4 and the child machine 1 is performed, a direct signal is transmitted between the parent machine 4 and the child machine 1 Since the signal can be transmitted and received simultaneously via the repeater while transmitting and receiving, the communication between the master unit 4 and the slave unit 1 becomes possible using two propagation paths. It is possible to select a signal having a good reception state in both, and even if the wireless state between the parent device 4 and the child device 1 is deteriorated, it is possible to prevent the reception quality from being deteriorated. The optimum repeater is selected based on the reception status of the transmission signal from the Communication between the master unit 4 and the slave unit 1 is possible via the unit, so that the reception quality can be improved, and by specifying a slot to be used between the slave unit 1 and the relay unit from the master unit 4 The base unit 4 can manage the slots used in the system, and can efficiently operate slot allocation.

(Embodiment 3)
FIG. 9 is a timing chart showing an operation when the parent device and the child device constituting the wireless communication system according to the third embodiment of the present invention start wireless communication. The configuration of the master unit and the slave unit configuring the radio communication system according to the third embodiment of the present invention is the configuration shown in FIG. 3 as in the second embodiment, and the system shown in FIG. 4 is used as the radio communication system. Is assumed.

  10 (a) and 10 (b) are timing charts showing an operation of starting a new wireless communication with another child device while the child device is communicating with the parent device in the third embodiment of the present invention. FIG. 11 is a timing diagram showing an operation of starting a new wireless communication with another child device while the parent device is communicating with the child device in the third embodiment of the present invention. In the wireless communication system according to the present embodiment, communication is performed by combining a frequency hopping method in which communication is performed while changing frequencies in a predetermined order and a TDMA method.

  The base unit 4 at the standby time periodically transmits control data for synchronization in a specific slot in the frame, like the base unit 4 of the second embodiment. However, the transmission frequency is changed in a determined order for each frame, and the reception frequency in the slot for receiving from the slave unit is also changed in the determined order. In the present embodiment, the case where the same frequency is used in the corresponding transmission slot and reception slot in the frame will be described as an example. As shown in FIG. 9, base unit 4 transmits control data in the first slot of each frame, and receives communication data from handset 1 in the sixth to eighth slots used for communication. At this time, the frequency used in each frame is sequentially changed to f1, f2,... (Only numbers 1, 2,... Are shown in FIG. 9). When the slave unit 1 enters a standby operation, it continuously receives any of the frequencies used by the master unit 4 and, when receiving successfully, establishes frequency hopping with the master unit 4 and TDMA synchronization. The received slot is received while changing the frequency in the order determined for each frame, and synchronization with the parent device 4 is maintained.

When the handset 1 performs a wireless link to the base unit 4 for calling from the base unit 4 or for outgoing calls by operating the handset 1, the handset 1 first sets the transmission slots from the sixth slot to the sixth slot. In order to determine whether or not the selected slot is in use, the reception of the corresponding reception slot is started and the reception level is detected. FIG. 9 shows an example in which the sixth slot is selected and the second slot is received. In addition, the reception frequency at this time is changed for each frame in synchronization with the frequency transmitted in the first slot of the base unit 4 (in FIG. 9, reception is performed at a frequency of f2 in frame 2 and at a frequency of f3 in frame 3). Here is an example to do): This reception level detection is performed continuously for several frames. When frames with a reception level equal to or higher than a certain level continue, it is determined that the corresponding slot is in use, and another slot is selected to determine whether it is in use as well. Judgment is made. When it is determined that the slot is unused, the slave unit 1 starts transmission in the corresponding transmission slot. The frequency at this time is also changed for each slot in synchronization with the transmission frequency of the control slot of base unit 4. When receiving the transmission from the child device 1, the parent device 4 starts the transmission in the corresponding transmission slot, and the activation of the communication slot between the parent device and the child device is completed. In FIG. 9, the slave unit 1 determines an empty slot in the frame 2 and the frame 3, starts transmission to the master unit 4 in the sixth slot of the frame 4, and the master unit 4 in the second slot of the frame 5 An example is shown in which transmission to the slave unit 1 is started and the activation of the communication slot between the master unit and the slave unit is completed in the second slot and the sixth slot. In the second slot and the sixth slot, the communication is continued while changing the frequency to be used sequentially in a predetermined order in the same manner as in the control slot after frame 5.

  Next, with reference to FIG. 10, an operation in which the child device 1 in communication with the parent device 4 starts a new wireless communication with another child device will be described.

  In FIG. 10, the first slot is used for transmission of the control slot from the master unit 4 to the slave units 2 and 3, and the master unit 4 and the slave unit 1 are already communicating using the second slot and the sixth slot. From the state, the master unit 4 and the slave unit 1 start up a new communication slot with the slave unit 2.

  In FIG. 10, first, in frame 1, a notification instructing the slave unit 2 and the slave unit 3, which are slave units waiting from the master unit 4 in the first control slot, to start communication with the slave unit 1. The notification of the slot used for communication with the child device 1 and the notification of the slot used for communication with the parent device 4 are transmitted. The handset 2 and handset 3 instructed to start communication determine the communication start frequency, start receiving the slot designated from the next frame, and confirm the presence / absence of a slot frequency collision. In the determination of the frequency, in order to avoid collision with the frequency timing used by the parent device 4, for example, the child device 2 is shifted by two from the frequency used by the parent device 4, and the child device 3 is Control is started so as to change the communication frequency at a timing shifted by three from the frequency used by the machine 4. That is, when there are six frequencies f1 to f6 and the frequency is used in the order of f1, f2, f3, f4, f5, and f6, in the frame in which the master unit 4 uses f2, the slave unit 2 Uses f4, and handset 3 uses f5. The subunit | mobile_unit 2 and the subunit | mobile_unit 3 receive several frames, changing a frequency sequentially from the frequency determined as mentioned above, and if the reception level is not continuously more than a threshold value, it will transmit to the subunit | mobile_unit 1. Start transmission in the specified slot. FIG. 10 shows an example in which an instruction to use the third slot and the seventh slot is given, and the handset 2 receives at the frequency of f4 in the third slot of the frame 2, and Reception is performed at the frequency of f5 in 3 slots, it is determined that there is no collision, transmission is performed at the frequency of f6 in the third slot of frame 4, and transmission is started at the frequency of f6 in the seventh slot. 3 receives at the frequency of f5 in the third slot of frame 2, receives at the frequency of f6 at the third slot of frame 3, determines that there is no collision, and at the frequency of f1 in the third slot of frame 4. An example is shown in which transmission is started at the frequency of f1 in the seventh slot while receiving.

  Also, in frame 1, a notification instructing the start of communication with another child device and a notification of the slot to be used are transmitted from the parent device 4 to the child device 1 in the second slot in communication. When receiving the notification, the slave unit 1 starts receiving the designated slot. Thereafter, the slave unit 1 receives at least one cycle of the hopping frequency and a time equal to or greater than the total time of the number of frames necessary for determining the empty slot at the same frequency selected from the hopping frequencies using the designated slot. When a transmission signal is received from another slave unit, the reception level is memorized. The slave unit with the highest reception level is synchronized with the corresponding slave unit, and communication is started. The start of the communication slot with the corresponding slave unit is completed. In FIG. 10, a notification instructing the start of communication with another child device from the parent device 4 and a notification of the slot to be used are received from the second slot of frame 1, and six frames corresponding to the cycle of the hopping frequency and a free space are received. A total of 8 frames of the two frames for slot determination, that is, the frame 3 to the frame 9, the designated third slot is received at the frequency f2 selected from the hopping frequencies, and the slave unit 3 received in the frame 5 is received. Is compared with the level of the received signal from the slave unit 2 received in the frame 6, the higher level slave unit 2 is selected, and the frequency of the slave unit 2 in the frame 10 is selected. The hopping synchronization is taken, transmission to the slave unit 2 is started in the seventh slot, and thereafter, the slave unit 1 and the slave unit 2 continue to communicate while changing the frequency sequentially.

Next, with reference to FIG. 11, the operation of starting the wireless communication between the other child device and the parent device 4 after the child device communicating with the parent device 4 completes the activation of the wireless communication with the other child device will be described. To do.

  In FIG. 11, the first slot is used for transmission of the control slot from the parent device 4 to the child device, and the parent device 4 and the child device 1 have already communicated using the second slot and the sixth slot, The handset 2 shows a state in which the base unit 4 starts a new communication slot with the handset 2 from the state in which the handset 2 has already communicated using the third slot and the seventh slot.

  When the slave unit 1 in communication with the master unit 4 completes the start of the wireless communication with the other slave unit 2 and starts the wireless communication between the other slave unit 2 and the master unit 4, the other slave unit 2 In accordance with the notification of the slot used for communication with the parent device 4 notified together with the notification instructing the start of communication with the child device from the device 4, control for starting communication with the parent device 4 is started in the corresponding slot. That is, the other slave units 2 first start reception of the corresponding reception slot and detect the reception level in order to determine whether or not the designated slot is in use. FIG. 11 shows an example in which the fourth slot and the eighth slot are designated and the fourth slot is received. In addition, the reception frequency at this time is changed for each frame in synchronization with the frequency transmitted in the first slot of the base unit 4 (in FIG. 11, reception is performed at a frequency of f2 in frame 2 and at a frequency of f3 in frame 3). Here is an example to do): The detection of the reception level is performed continuously for several frames. When frames having a reception level equal to or higher than a certain level continue, it is determined that the corresponding slot is in use and the connection operation is stopped. When it is determined that the slot is unused, the other slave units 2 start transmission in the corresponding transmission slot. The frequency at this time is also changed for each slot in synchronization with the transmission frequency of base unit 4. When receiving the transmission from the other slave unit 2, the master unit 4 starts the transmission in the corresponding transmission slot, completes the activation of the communication slot between the master unit 4 and the other slave unit 2, and the master unit 4 Sends a notification to stop control to all the slave units that are going to start the relay operation in the first slot, and the slave unit that is trying to start the relay operation stops the operation and returns to the standby state. In FIG. 11, the slave unit 2 determines an empty slot in the frame 2 and the frame 3, starts transmission to the master unit 4 in the eighth slot of the frame 4, and the master unit 4 in the fourth slot of the frame 5. An example is shown in which transmission to the slave unit 2 is started and activation of the communication slot between the master unit 4 and the slave unit is completed in the fourth slot and the eighth slot. Further, the master unit 4 that has completed the activation of the communication slot with the slave unit 2 notifies the slave unit 1 to stop the relay operation with the slot 1 of the frame 5, and first communicates with the slave unit 1. A notification for instructing the start, a notification of a slot used for communication with the child device 1 and a notification of a slot used for communication with the parent device 4 are received, and the third slot is used for connection with the child device 1. The subunit | mobile_unit 3 which was transmitting stops transmission of a 3rd slot, and transfers to standby operation.

  When the other slave unit 2 determines that there is no empty slot in the determination of an empty slot and the connection with the master unit 4 is interrupted, or the communication slot between the other slave unit 2 and the master unit 4 fails to start. The other handset 2 notifies the handset 1 that the connection with the base unit 4 has failed, stops communication between the handset 1 and the other handset 2, and communicates with the base unit 4. The middle child device 1 is further connected to another child device. In the example of FIGS. 10 and 11, when the handset 2 determines that the slot 4 cannot be used in the frames 2 and 3 in FIG. The communication between the slave unit 2 and the slave unit 1 (communication between the slot 3 and the slot 7) is stopped after the frame 5, and the slave unit 1 is connected to the slave unit 2 in FIG. As in the case of connection, the slave unit 1 synchronizes frequency hopping with the slave unit 3, communication between the slave unit 1 and the slave unit 3 is activated, and the slave unit 3 communicates with the master unit 4. Operates to do.

In this embodiment, in order to start the relay operation, a slave unit other than communicating with the master unit 4 starts transmission to the slave unit 1 communicating with the master unit 4 in accordance with an instruction from the master unit 4. In this example, control is performed so that transmission to the slave unit 1 in communication with the master unit 4 is stopped according to an instruction from the master unit 4 when any slave unit starts the relay operation. According to the instruction, the slave unit that has started transmission to the slave unit 1 in communication with the master unit 4 automatically stops transmission to the slave unit 1 in communication with the master unit 4 after a predetermined time has elapsed. It is possible to return to normal standby operation,
In this case, there is an effect that it is possible to prevent unnecessary transmission from being continued even if a stop message from the parent device 4 cannot be received. Further, in the wireless communication system according to the present embodiment, an example is shown in which slots other than the control slot notified from parent device 4 are used as communication slots between child device 1 and other child devices that perform relay operations. However, the frequency hopping timing of the master unit 4 and the frequency hopping timing of communication between the slave unit 1 and other slave units that perform the relay operation are different, and transmission and interference of the control slot of the master unit 4 are different. There is no danger of doing. Therefore, it is possible to use a control slot transmitted from the parent device 4 and a reception slot corresponding to the communication slot between the child device 1 and another child device performing the relay operation. A communication slot between the slave unit 1 and another slave unit that performs a relay operation is always used as a reception slot corresponding to a transmission slot for control of the master unit 4, and according to the instruction from the master unit 4 as described above, The slave unit that has started transmission to the slave unit 1 in communication automatically stops transmission to the slave unit that is communicating with the master unit 4 after a predetermined time has elapsed. Therefore, there is no need to specify the slot to be used, and control is facilitated. Furthermore, in the wireless communication system according to the present embodiment, connection between the master unit 4 and the slave unit and connection via another slave unit that performs a relay operation are performed. Although a method for establishing two wireless communication paths has been described, a method for transmitting and receiving an audio signal using these two wireless communication paths and selecting one of them to reproduce the audio signal is also used in this embodiment. This is the same as that described in FIG. Furthermore, in this embodiment, when the communication slot is activated, the activation of the communication slot is completed when transmission of the activated side is started. It is also possible to determine that the activation has been completed by notifying the activator that the transmission on the activation side has been received, or even that the activation has been completed by notifying the activation side that the notification has been received. In this case, there is an effect that a more accurate determination of success / failure of activation is possible.

As described above, according to this embodiment, radio communication is multiplexed using the TDMA method, and the frequency used in each slot is communicated using the frequency hopping method in which communication is performed while switching a predetermined frequency. Is a wireless communication system comprising a master unit 4 and a slave unit 1 that perform communication, and at least one relay unit that relays wireless communication between the master unit 4 and the slave unit 1, wherein the master unit 4 is used for synchronization of TDMA and frequency hopping. The slave unit 1 receives the control slot from the master unit 4 and establishes synchronization between TDMA and frequency hopping, and the master unit 4 or the slave unit 1 makes a call from the own unit or the partner unit. Based on this, communication with the slave unit 1 or the master unit 4 is started in a slot other than the control slot, the master unit 4 instructs the relay unit to start transmission of the control slot, and the relay unit controls the control slot from the master unit 4. The TDMA and the frequency hopping synchronization are established, and when the control slot transmission start instruction from the base unit 4 is received, the TDMA and the slave unit 1 in the slots other than the slot in which the base unit 4 and the slave unit 1 communicate with each other. The slave unit 1 transmits a control slot for frequency hopping synchronization, the slot 1 receives a slot other than the slot communicating with the base unit 4, receives the control slot transmitted by the repeater, and receives the reception quality. Select a good repeater, request the selected repeater to start communication, communicate with the selected repeater, and the repeater communicates with the slave 1 in response to a request for start of communication from the slave 1 Starts communication, requests the base unit 4 to start communication, communicates with the base unit 4, the base unit 4 starts communication in response to the start of communication from the relay unit, and controls the relay unit as necessary Instructs the slot to stop transmitting and the repeater 4 stops the transmission of the control slot, the master unit 4 compares the received signal from the slave unit 1 with the received signal from the repeater, selects the better received data, and performs reception processing. The slave unit 1 compares the received signal from the master unit 4 with the received signal from the relay unit, selects the better received data, and performs reception processing, thereby enabling communication between the master unit 4 and the slave unit 1. Since signals can be transmitted / received via the repeater at the same time while transmitting / receiving signals directly between the master unit 4 and the slave unit 1, between the master unit 4 and the slave unit 1 using two propagation paths Communication is possible, and it becomes possible to select a signal with a good reception state in both the parent device 4 and the child device 1, and even if the wireless state between the parent device 4 and the child device 1 deteriorates, the deterioration of the reception quality is prevented. In addition, after the communication between the master unit 4 and the slave unit 1 is started, a control signal transmitted by the relay unit is transmitted. It becomes possible for the slave unit 1 to receive and perform communication by selecting a repeater having good reception quality, further improve the radio reception quality, and by performing communication by the frequency hopping method, Even if each repeater transmits a control signal in the same slot, changing the frequency switching control allows the handset 1 to receive the control slot from the repeater transmitted in the same slot. Even if the number of TDMA slots is small, it is possible to receive more transmission signals from the repeater, and there is no restriction on the simultaneous transmission of the repeaters due to the number of TDMA slots, thus enabling effective operation.

  Further, if the relay unit is instructed to switch to the operation as the relay unit from the base unit 4 and starts to operate as the relay unit in accordance with the instruction from the base unit 4, the base units 4 and 1 When one slave unit performs communication, the other slave unit operates as a relay unit, and a device that operates exclusively for the relay unit is not required, and an inexpensive wireless communication system can be constructed.

  The present invention relates to a wireless communication system that performs communication using wireless signals, and can prevent deterioration of reception quality due to propagation failure.

1 is a block diagram showing a wireless communication system according to Embodiment 1 of the present invention. 1 is a data format diagram showing a data structure of a communication slot between a base station and a wireless telephone used during communication in the wireless communication system of FIG. The block diagram which shows the main | base station and the subunit | mobile_unit which comprise the radio | wireless communications system by Embodiment 2 and 3 of this invention. FIG. 2 is a block diagram showing an example of a wireless communication system according to Embodiments 2 and 3 of the present invention. Timing diagram showing slot timing of transmission / reception at the start of a call between a parent device and a child device in a wireless communication system according to a second embodiment of the present invention Timing diagram showing slot timing of transmission / reception at the start of a call between a parent device, a child device, and another child device operating as a repeater in the wireless communication system according to the second embodiment of the present invention Timing diagram showing slot timing of transmission / reception during a call between a parent device, a child device, and another child device operating as a repeater in the wireless communication system according to the second embodiment of the present invention (A) Data format diagram showing a data structure of a communication slot used during communication between a parent device, a child device, and a repeater in a wireless communication system according to the second embodiment of the present invention, (b) according to the second embodiment of the present invention. Data format diagram showing the data structure of a communication slot used during communication between a master unit, a slave unit, and a repeater in a wireless communication system Timing chart showing an operation when a base unit and a handset constituting a wireless communication system according to Embodiment 3 of the present invention start wireless communication (A) Timing diagram showing an operation for starting a new wireless communication with another child device while the child device in the third embodiment of the present invention is communicating with the parent device, (b) Embodiment 3 of the present invention. Diagram showing the operation of starting a new wireless communication with another child device while the child device is communicating with the parent device Timing diagram showing an operation of starting a new wireless communication with another child device while the parent device is communicating with the child device in the third embodiment of the present invention

Explanation of symbols

1, 2, 3 Slave unit 4 Master unit 10 Control station 11 Wired telephone 12 Wireless telephone 13 First base station 14 Second base station 15 Third base station 100 Antenna 101 Transmitter 102 Transmitted data processor 103 Transmitted data Storage unit 104 Transmission audio processing unit 105 Microphone 111 Reception unit 112 Reception data processing unit 113 Reception data storage unit 114 Reception audio processing unit 115 Speaker 130 Operation unit 140 Display unit 150 Control unit

Claims (11)

A main radio communication system, a plurality of sub radio communication systems capable of communicating with radio communication terminals in the main radio communication system, and a control station that controls the main radio communication system and the plurality of sub radio communication systems A wireless communication system comprising:
The control station selects a sub radio communication system that forms a plurality of radio communication paths together with the main radio communication system based on a quality of a received signal from the radio communication terminal in the plurality of sub radio communication systems. A wireless communication system. Radio communication having one main base station, two sub base stations, a radio telephone capable of communicating with the main base station and the sub base station, and a control station for controlling the main base station and the sub base station A system,
The control station causes the two sub-base stations to communicate with the radiotelephone via the main base station, and compares the quality of signals received from the radiotelephone at the two sub-base stations, A higher-quality sub-base station is selected, and communication with the radio telephone is performed using two radio communication paths between the main base station and the higher-quality sub-base station between the radio telephone and the radio telephone. A wireless communication system. One main base station, first to n-th (n is a natural number of 2 or more) sub-base stations, a radio telephone capable of communicating with the main base station and the sub-base station, the main base station and the sub-base station A wireless communication system having a control station for controlling a base station,
The control station causes the first to n-th sub-base stations to communicate with the radio telephone via the main base station, and from the radio telephones in the first to n-th sub-base stations. Compare the quality of received signals, select the sub-base station with the highest quality or select a plurality of sub-base stations in the order of the highest quality, and select the sub-base with the highest quality selected with the main base station with the radio telephone A wireless communication system, wherein communication with the wireless telephone is performed using two wireless communication paths or three or more wireless communication paths with a station or the selected plurality of sub base stations. A wireless communication system comprising a parent device and a child device that perform communication using the TDMA system, and a relay device that relays wireless communication between the parent device and the child device,
The base unit is a wireless unit that performs wireless transmission / reception by the TDMA method, a transmission data processing unit that generates data sequences to be transmitted in each slot by adding error detection data and synchronization data to transmission data, A reception data processing unit that extracts reception data and error detection data from the reception signal of each slot received and demodulated by the radio unit and detects whether there is a reception error in the reception data of each slot; and error detection in the reception data processing unit A control unit that performs control to select and process data that has no reception error based on the result;
The slave unit includes a wireless unit that performs wireless transmission / reception in a TDMA system, a transmission data processing unit that generates data sequences to be transmitted in each slot by adding error detection data and synchronization data to transmission data, A reception data processing unit that extracts reception data and error detection data from the reception signal of each slot received and demodulated by the radio unit and detects whether there is a reception error in the reception data of each slot; and error detection in the reception data processing unit A control unit that performs control to select and process data that has no reception error based on the result;
The repeater includes a wireless unit that performs wireless transmission / reception in a TDMA system, a transmission data processing unit that generates data sequences to be transmitted in each slot by adding error detection data and synchronization data to transmission data, A reception data processing unit that extracts reception data and error detection data from the reception signal of each slot received and demodulated by the radio unit and detects whether there is a reception error in the reception data of each slot; and reception data from the master unit A wireless communication system, comprising: a control unit that performs control so as to transmit data to the slave unit and transmit data received from the slave unit to the master unit. A wireless communication system comprising a parent device and a child device, and a relay device that relays wireless communication between the parent device and the child device,
The parent device or the child device starts communication with the child device or the parent device by a call from the own device or the other device, and then the parent device starts communication with the relay device and the child device Starts communication with the repeater, the master unit compares the received signal from the slave unit and the received signal from the repeater, selects the better received data, receives the processing, The slave unit compares the received signal from the master unit with the received signal from the repeater, selects the better received data, and performs reception processing. A wireless communication system comprising a parent device and a child device, and at least one relay device that relays wireless communication between the parent device and the child device,
The parent device or the child device starts communication with the child device or the parent device by a call from the own device or the partner device, the relay device transmits a signal receivable by the child device, and the child device Receives the transmission signal of the repeater, detects the quality of the received signal, selects a repeater with good reception quality based on the quality of the received signal, and starts communication with the selected repeater Then, communication with the master unit is started via the selected repeater, and the master unit compares the received signal from the slave unit with the received signal from the repeater and receives the better received data. The slave unit performs reception processing by comparing the received signal from the master unit with the received signal from the repeater and selects the better received data. Wireless communication system. A wireless communication system comprising a parent device and a child device, and at least one relay device that relays wireless communication between the parent device and the child device,
The parent device or the child device starts communication with the child device or the parent device by a call from the own device or the partner device, the child device transmits a signal that can be received by the relay device, and the relay device Receives the transmission signal of the slave unit and detects the quality of the received signal, the slave unit selects the repeater having the better reception quality based on the quality of the received signal, and selects the selected relay unit Communication with the master unit via the selected repeater, and the master unit compares the received signal from the slave unit with the received signal from the selected repeater unit. Then, the reception data of the better one is selected and received, and the slave unit compares the reception signal from the master unit with the reception signal from the selected repeater to obtain the better reception data. A radio communication system characterized by selecting and receiving processing. A wireless communication system comprising a parent device and a child device that perform communication using the TDMA system, and at least one relay device that relays wireless communication between the parent device and the child device,
The parent device or the child device starts communication with the child device or the parent device by a call from the own device or the other device, and the parent device starts communication with the child device / relay device. The slave unit and the repeater are instructed to use the slot, the slave unit transmits a signal to the repeater in the slot designated by the master unit, and the repeater is in the slot designated by the master unit. The transmission signal from the slave unit is received, the reception quality of the transmission signal from the slave unit is detected, the reception quality is notified to the master unit, and the master unit is notified from each relay unit The relay unit is selected based on the reception quality, the selected relay unit is instructed to start communication with the slave unit, and the selected relay unit and the slave unit communicate with each other in the slot designated by the master unit. The master unit receives the received signal from the slave unit and the selected repeater The received data is compared with the received signal and the received data is selected and processed. The slave unit compares the received signal from the master unit with the received signal from the selected repeater. A radio communication system characterized by selecting and processing reception data of a better one. A wireless communication system comprising a parent device and a child device that perform communication using the TDMA system, and at least one relay device that relays wireless communication between the parent device and the child device,
The parent device or the child device starts communication with the child device or the parent device by a call from the own device or the other device, and the parent device starts communication with the child device / relay device. The relay unit is instructed to the slot to be used, the relay unit transmits a signal to the slave unit in the slot designated by the base unit, and the base unit transmits a transmission signal from the relay unit to the base unit. The slave unit is instructed to receive in the designated slot, and the slave unit receives the signal from the relay unit to detect the reception quality, and the reception quality of the transmission signal transmitted from each relay unit The relay device is selected on the basis of, and the communication with the selected relay device is started, the selected relay device starts communication with the parent device, and the parent device receives the received signal from the child device. Compare the received signal from the selected repeater and select the better received data The slave unit compares the received signal from the master unit with the received signal from the selected repeater, selects the better received data, and performs the receiving process. Wireless communication system. Multiplexing of wireless communication using the TDMA system, and the frequency used in each slot is a base unit and a slave unit that perform communication using a frequency hopping method in which communication is performed while switching a predetermined frequency. A wireless communication system comprising at least one repeater that relays wireless communication of a slave unit,
The master unit transmits a control slot for synchronization of TDMA and frequency hopping, and the slave unit receives a control slot from the master unit and establishes synchronization of TDMA and frequency hopping. The machine starts communication with the child machine or the parent machine in a slot other than the control slot based on a call from the own machine or the partner machine, and the parent machine instructs the relay machine to start transmission of the control slot. The repeater receives a control slot from the master unit, establishes synchronization between TDMA and frequency hopping, and receives a control slot transmission start instruction from the master unit to communicate between the master unit and the slave unit Control slots for synchronization of TDMA and frequency hopping are transmitted in slots other than the slot that is performing communication, and the slave unit is other than the slot that is communicating with the master unit Receives the slot, receives the control slot transmitted by the repeater, selects a repeater with good reception quality, requests the selected repeater to start communication, and communicates with the selected repeater The relay device starts communication with the child device in response to a request for communication start from the child device, requests the parent device to start communication, communicates with the parent device, and the parent device , Start communication in response to the start of communication from the repeater, and instruct the repeater to stop transmission of the control slot if necessary, the repeater of the control slot according to the instruction from the master unit The master unit stops transmission, the master unit compares the received signal from the slave unit and the received signal from the repeater, selects the better received data, and performs reception processing. Compare the received signal from and the received signal from the repeater Wireless communication system, characterized in that the reception process by selecting the received data of good Na way. 11. The relay device according to claim 5, wherein the relay device is a slave device that is instructed to switch to operation as a relay device from the master device and starts operation as a relay device in accordance with the instruction of the master device. The wireless communication system according to any one of the above.

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