JP2009118494A - Wireless repeater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless repeater capable of increasing the number of storable lines per wireless repeater or a communication speed by reducing reception sensitivity suppression to one radio section by unwanted emission generated by the other. <P>SOLUTION: The wireless repeater 1 receives radio waves transmitted from a base station or a terminal by an antenna 5A for the base station or an antenna 5B for the terminal, and then transmits the reception signal to the terminal or the base station from the antenna 5B for the terminal or that 5A for the base station. When the duty factor of a slot is not more than 50%, change-over switches 28A, 28B are driven to use the omnidirectional antennas 5A, 5B as antenna devices. When the duty factor of a slot exceeds 50%, the change-over switches 28A, 28B are driven to use the antenna device comprising the antennas 5A, 5B having coaxial cables 6A, 6B. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radio communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, and relates to a radio relay apparatus used to supplement a weak electric field area as a communication area.

  When radio waves are relayed in a radio communication system using the TDMA system, the TDMA radio relay apparatus 1 is equipped with two radio units 2A and 2B as shown in FIG. While communicating with the base station 3, it is necessary to communicate with the terminal 4 at the other radio unit 2B. In this case, for example, the demodulated signal received and demodulated by the receiving unit (not shown) of the radio unit 2A from the base station 3 via the base station antenna 5A is sent to the transmitting unit (not shown) of the radio unit 2B. Then, after being subjected to radio frequency conversion as a transmission signal by this transmission unit, it is sent to the terminal 4 via the terminal antenna 5B.

  On the contrary, the demodulated signal received and demodulated by the receiving unit (not shown) of the radio unit 2B from the terminal 4 via the antenna 5B for the terminal is sent to the transmitting unit (not shown) of the radio unit 2A. The radio frequency is converted as a transmission signal by the transmission unit, and then transmitted to the base station 3 via the base station antenna 5A.

  By the way, in the case of PHS, as shown in FIG. 9, communication is performed using four time slots (hereinafter abbreviated as “slots”) for uplink and downlink. For example, the radio unit 4A and the radio unit 4B If the slot At1 and the slot Br1 are used at the same time, reception sensitivity suppression of the reception slot Br1 occurs due to unnecessary radiation in the transmission slot At1.

  Therefore, in the wireless relay device 1, conventionally, in order to prevent the reception sensitivity from being suppressed to the other wireless device unit due to unnecessary radiation generated by one wireless device unit, at the timing when one wireless device unit is transmitting, The machine did not receive.

There is also provided a wireless relay device having a function of suppressing the occurrence of abnormal oscillation due to a part of the transmission output from the transmission antenna to the reception antenna by a frequency offset (for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-112402

  In order to prevent the reception sensitivity of the other radio unit from being suppressed due to unwanted radiation emitted by one radio unit, the other radio unit did not receive signals at the timing of transmission. In the conventional wireless relay device, at the timing when one wireless device is transmitting, the other wireless device needs to be in a standby state or a transmission state, but two wireless devices are alternately placed in a standby state and a communication state. In this case, the number of lines that can be accommodated per radio relay apparatus or the communication speed is halved.

  In addition, in the conventional example in which one of the two systems of radio equipment mounted in the radio relay apparatus transmits, the other also transmits, and when one receives, the other also receives, the radio relay between the base station and the terminal The transmission / reception timing is reversed between the case of communicating via the device and the case of communicating without going through the wireless relay device.

  Furthermore, in the case of the above-mentioned Patent Document 1, an IF signal is extracted, an IF operation system that controls the phase, amplitude, and delay time to control the wraparound component with a synthesizer, and a coupler 14 extracts the RF signal. Similarly, the configuration of providing an RF operation system that is controlled and suppressed by the synthesizer is complicated.

  The present invention has been made in view of the above points, and the object of the present invention is to reduce suppression of reception sensitivity to the other radio unit due to unnecessary radiation emitted from one radio unit, and to achieve one radio relay device. An object of the present invention is to provide a wireless relay device that can increase the number of lines that can be accommodated or the communication speed.

  According to the first aspect of the present invention, there is provided a wireless communication system using a TDMA system in which frequency bands used in a transmission channel and a reception channel are close to each other, and is used to supplement a weak electric field area as a communication area. In the radio relay apparatus for transmitting a radio signal transmitted from a base station antenna or a terminal antenna and then transmitting a reception signal from the terminal antenna or the base station antenna toward the terminal or base station, the base station A direction in which the direction of the polarization plane of the antenna for the station and the direction of the polarization plane of the antenna for the terminal are set different from each other, and the antenna for the base station and the antenna for the terminal are in the null direction. A second antenna device installed toward the base station, an omnidirectional antenna as the antenna for the base station, A third antenna device using a directional antenna as a terminal antenna, and a fourth antenna installed using a directional antenna as a base station antenna and a terminal antenna respectively with different directivity directions. The slot usage rate is monitored by monitoring the slot usage rate with one antenna device consisting of any one of the antenna devices and other antenna devices in which both the antenna for the base station and the antenna for the terminal are both omnidirectional antennas. Another antenna device is provided when the ratio is 50% or less, and antenna selection means for switching one antenna device when the slot usage rate exceeds 50%.

  According to the present invention, by switching to an antenna device according to the installation environment, isolation is increased, reception sensitivity suppression due to self-interference waves is reduced, and the number of lines that can be stored per one radio relay device or communication speed is increased. be able to.

  By switching to an antenna device according to the installation environment, the present invention increases isolation, reduces reception sensitivity suppression due to self-jamming waves, and increases the number of lines that can be stored per one radio relay device or the communication speed. There is an effect that can be done.

(Basic form 1)
FIG. 2 shows the external appearance of the wireless relay device 1 of this basic form. In the device main body 10, two systems of radio units (not shown) are housed in the same manner as the wireless relay device 1 shown in FIG. 9. On both side surfaces of the apparatus main body 4, a monopole antenna 5A for a base station connected to an antenna feeding path of a radio unit for a base station, and a monopole type connected to an antenna feeding path of a radio base for a terminal There is a feature in that the antenna device 5B for the terminal is attached to be an antenna device of the wireless relay device 1.

  In the illustrated example, the polarization plane of the base station antenna 5A is directed in the vertical direction, and the polarization plane of the terminal antenna 5B is directed in the horizontal direction.

  Thus, in this basic mode, the base station antenna 5A is vertically polarized and the terminal antenna 5B is horizontally polarized, thereby improving the isolation between the two antennas 5A and 5B and receiving sensitivity due to self-interfering waves. It is possible to reduce suppression and increase the number of lines that can be accommodated per radio relay apparatus 1 or the communication speed.

  The reason why the polarization plane of the antenna 5A for the base station is set to the vertical polarization is that the vertical polarization antenna is usually used in the base station, and the radio wave from the base station compared to the radio wave from the terminal as viewed from the wireless relay device 1. This is to make it easier to receive radio waves from the base station.

  In this basic mode, linearly polarized antennas are used as both antennas 5A and 5B. However, even if the polarization is changed using a circularly polarized antenna, the isolation is similarly increased, and self-jamming waves are used. Receiving sensitivity suppression can be reduced.

(Basic form 2)
In the basic mode 1, an antenna device is used in which the polarization plane of the base station antenna 5A and the polarization plane of the terminal station antenna 5 are different from each other. However, in this basic mode, as shown in FIG. The antenna device is characterized in that a monopole antenna 5A for a base station and an antenna 5B for a terminal that are horizontally arranged on both sides in the null direction are used.

  Thus, in this basic mode, the base station antenna 5A and the terminal antenna 5B are directed toward the null side, thereby improving isolation between the antennas 5A and 5B and reducing reception sensitivity suppression due to self-jamming waves. It is possible to increase the number of lines that can be accommodated per radio relay apparatus or the communication speed.

  In the apparatus main body 10, a radio unit for a base station and a radio unit for a terminal are housed as in the case shown in FIG. 8.

(Basic form 3)
In this basic mode, as shown in FIG. 4, an omnidirectional dipole base station antenna 5A provided vertically on one side surface of the device body 10 of the wireless relay device 1 and the other side surface of the device body 10 are provided. There is a feature in that an antenna device including a terminal antenna 5B having directivity including a patch antenna is provided.

  Thus, in this basic mode, the base station antenna 5A is a omnidirectional antenna, and the terminal antenna 5B is a directional antenna, whereby a radio relay apparatus using omnidirectional antennas for both antennas 5A and 5B is provided. While maintaining the same relayable area, increase the isolation between the antennas 5A and 5B, reduce reception sensitivity suppression due to self-jamming waves, and increase the number of lines that can be accommodated per radio relay device or the communication speed It is possible.

  The apparatus main body 10 stores a radio unit for a base station and a radio unit for a terminal as in the case shown in FIG.

(Basic form 4)
As shown in FIG. 5, this basic form is composed of a base station antenna 5A and a terminal antenna 5B, each of which has a directivity patch antenna provided on both side surfaces of the device body 10 of the wireless relay device 1. It is characterized in that an antenna device is used.

  Thus, in this basic mode, the base station antenna 5A and the terminal antenna 5B are both directional antennas, thereby improving the isolation between the antennas 5A and 5B and reducing the reception sensitivity suppression due to the self-jamming wave. The number of lines that can be accommodated per radio relay apparatus or the communication speed can be increased.

(Basic form 5)
In this basic mode, as shown in FIG. 6, a slot assigned by the base station is detected from a received signal at the receiving unit 20 of the radio unit 2A for the base station, and the slot used is changed to a radio unit for the terminal station. A used slot notifying unit 26 for notifying 2B, and a slot control unit 27 for determining a used slot in the transmitting unit 21 of the radio unit 2B for the terminal based on the notification from the slot notifying unit 18; The antenna device using the vertically polarized monopole antenna is used for both the base station antenna 5A and the terminal antenna 5B as in the prior art.

  Thus, in this basic mode, as shown in FIG. 7, when the assigned slot is notified from the slot notifying unit 26 assigned by the base station, the slot control unit 27 uses the number of slots used for communication with the base station. Is checked whether it is 3 or more or less than 3 (S1). Here, the number of slots used in the PHS is 4 as described in FIG. If the used slot usage is less than 3, that is, the usage rate is 50% or less, the slot control unit 27 inquires the used slot notification unit 26 about the slot used by the base station (S2). A base station unused slot is arbitrarily allocated for a terminal (S3). After determining whether or not to use the slot for the terminal (S4), if it is not used, the assignment is completed, and when it is used, the unused slot is switched as a slot used for the terminal (S5). On the other hand, when the number of slots used is 3 or more in communication with the base station, that is, when the usage rate exceeds 50%, an empty slot is arbitrarily selected as a slot used for communication with the terminal (S6), and the transmission unit 21 Complete slot assignment.

  Accordingly, if the slot usage rate in communication with the base station is 50% or less, reception sensitivity suppression due to transmission on the terminal side does not occur, and the communication speed can be increased.

(Embodiment)
In the basic mode 5, the slot used in the terminal is assigned and controlled by the slot usage rate in communication with the base station. This embodiment is shown in FIG. 1 in addition to the configuration of the basic mode 5. Thus, when the slot usage rate is 50% or less, the antenna switches (other antenna devices) are switched by driving the changeover switches 28A and 28B so that the omnidirectional antennas 5A and 5B are used. Is more than 50%, a configuration (antenna selection means) for driving the changeover switches 28A and 28B so as to use the antenna device (one antenna device) including the antennas 5A and 5B with the coaxial cables 6A and 6B is used. There is a feature in the added point. Here, directional patch antennas are used as the antennas 5A and 5B with the coaxial cables 6A and 6B. Of course, any one antenna device of the basic modes 1 to 4 may be used.

  Thus, in this embodiment, if the slot usage rate is 50% or less, the same relayable area as that of the wireless relay device using the conventional omnidirectional antennas 5A and 5B can be maintained, and the slot usage rate. If it exceeds 50%, it is possible to reduce reception sensitivity suppression of self-interfering waves and increase the number of lines that can be accommodated per one radio relay apparatus or the communication speed.

It is a circuit block diagram of the radio relay apparatus of one Embodiment of this invention. It is a perspective view of the radio relay device of basic form 1 of the present invention. It is a perspective view of the radio relay device of basic form 2 of the present invention. It is a perspective view of the radio relay device of basic form 3 of the present invention. It is a perspective view of the radio relay device of basic form 4 of the present invention. It is a circuit block diagram of the radio relay apparatus of the basic form 5 of this invention. It is a flowchart for operation | movement description same as the above. It is a communication system figure using a radio relay device. It is a timing chart of the time slot used for a communication system same as the above.

Explanation of symbols

1 Radio relay device 5A Base station antenna 5B Terminal antenna 6A, 6B Coaxial cable 28A, 28B Changeover switch

Claims (1)

A wireless communication system using the TDMA system in which the frequency bands used in the transmission channel and the reception channel are close to each other, used to supplement a weak electric field area as a communication area, and used to transmit radio waves transmitted from a base station or terminal. In a radio relay apparatus that transmits a received signal from a terminal antenna or a base station antenna to a terminal or a base station after being received by a station antenna or a terminal antenna,
The first antenna device installed with the direction of the polarization plane of the base station antenna and the direction of the polarization plane of the terminal antenna different from each other, and the base station antenna and the terminal antenna A second antenna device installed in a specific direction, a third antenna device using a non-directional antenna as the antenna for the base station, and a directional antenna as the antenna for the terminal, the antenna for the base station, and One antenna device composed of any one of the fourth antenna devices, each using a directional antenna as the antenna for the terminal and installed in different directivity directions, and the antenna for the base station and the terminal The slot usage rate is monitored with another antenna device in which both antennas are omnidirectional antennas, and the slot usage rate is 50. Other antenna device when the following radio relaying apparatus utilization slot, characterized in that an antenna selection means for switching an antenna device when exceeding 50%.

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