JP2011010112A - Mobile communication relay system and communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile communication relay system which has an antenna in which the directivity in a certain direction is suppressed low, and also uses a thinner type communication device than that provided newly with a radio reflecting plate.SOLUTION: The mobile communication relay system has a first communication device for making first radio communications with a base station device, and a second communication device for making second radio communications with a mobile station device. The first communication device has a circuit board 600 providing a circuit component, and the antenna provided on the side of one surface 602 of the circuit board 600. The circuit board 600 has: the one surface 602 provided to face an arrival direction of radiowaves from the base station device; and the other surface 604 provided to face a direction of a region where the second radio communications are made. The circuit board 600 has a conductive layer 614 which reflects radiowaves on the one surface 602.

Description

  The present invention relates to a mobile communication relay system and a communication apparatus.

  There is a mobile communication relay system that is provided indoors and includes a donor device that performs wireless communication with a base station device, and a remote device that performs wired communication with the donor device and performs wireless communication with a mobile station device. In such a mobile communication relay system, the wireless communication in the donor device and the wireless communication by the remote device may be performed using communication resources at least partially overlapping each other.

  Note that Patent Document 1 discloses an antenna device that includes a plurality of antenna elements provided on a substrate on which a radio wave reflector is formed or built, and whose directivity changes by controlling power feeding to each of the antenna elements. .

JP 2008-22123 A

  When a donor device and a remote device that perform wireless communication using communication resources at least partially overlapping each other are installed in the same indoor space, wireless communication may interfere with each other because they are close to each other. Therefore, it is required to suppress the directivity in the indoor direction of the antenna of the donor apparatus that does not need to perform wireless communication indoors. As a method for reducing the directivity of the antenna in a certain direction, shielding by a radio wave reflector can be mentioned. However, if a radio wave reflector is newly provided, the shape of the donor device becomes thick.

  The present invention has been made in view of the above-mentioned problems, and has a antenna with low directivity in a certain direction and uses a communication device that is thinner than that in which a radio wave reflector is newly provided. An object is to provide a communication relay system.

  In order to solve the above problems, a mobile communication relay system according to the present invention includes a first communication device that performs first wireless communication with a base station device, and a second communication that performs second wireless communication with the mobile station device. And a communication resource used in the first wireless communication and a communication resource used in the second wireless communication at least partially overlap each other, wherein One communication device has a circuit board on which circuit components are provided, and an antenna provided on one surface side of the circuit board, and the circuit board has one surface on which radio waves from the base station device are transmitted. The circuit board has a conductive layer that reflects radio waves on the one surface. The circuit board is provided so as to face the arrival direction and the other surface faces the direction of the region where the second wireless communication is performed.

  According to the present invention, since the radio wave is reflected by the conductive layer of the circuit board, it is not necessary to install a radio wave reflector, and the antenna has low directivity in the direction in which the conductive layer is provided. There is provided a mobile communication relay system using a communication device having a thinner shape than that newly provided with a reflector.

  In one embodiment of the present invention, the apparatus further includes a support portion that is fixed to the one surface and supports the antenna, and at least a part of the surface of the support portion that faces the one surface is the one surface. A circuit component having a thickness equal to or less than a distance between the one surface and the support portion is provided in the region separated from the surface and separated from the support portion on the one surface. Circuit components are provided on the surface.

  According to this aspect, the communication device having a shape smaller than that in which the circuit component is not provided in the region facing the support portion of the circuit board or in which the circuit substrate for newly providing the circuit component is newly provided is used. A mobile communication relay system was provided.

  In one embodiment of the present invention, the antenna has directivity in a vertical direction with respect to the one surface on the opposite side of the circuit board with respect to the antenna, and at least one of horizontal polarization and vertical polarization Is a patch antenna that generates

  According to this aspect, a mobile communication relay system using a communication device having more remarkable directivity is provided by the directivity of the patch antenna.

  In one embodiment of the present invention, the antenna includes a substrate made of a non-conductive resin, and a wiring that is provided on a surface of the substrate opposite to the circuit board and that radiates radio waves using an externally supplied current. And a ground plate provided on the surface of the substrate on the circuit board side, and the support portion is made of a non-conductive resin.

  The communication device according to the present invention is a communication device having a circuit board and an antenna provided on one surface side of the circuit board, and the circuit board has the one surface connected to the communication device. The direction of arrival of radio waves from the base station device performing the first wireless communication is directed, and the other surface is provided to face the direction of the region where the second wireless communication is performed by the mobile station device and the other communication device, The circuit board has a conductive layer that reflects radio waves on one surface.

  According to the present invention, since the radio wave is reflected by the conductive layer of the circuit board, it is not necessary to install a radio wave reflector, and the antenna has low directivity in the direction in which the conductive layer is provided. There is provided a communication device having a shape thinner than that in which a reflector is newly provided.

It is a figure which shows the communication system containing the mobile communication relay system which concerns on embodiment of this invention. It is a block diagram which shows the structure of the donor apparatus which concerns on embodiment of this invention. It is a figure which shows the mobile communication relay system which concerns on embodiment of this invention. It is a figure which shows the timing of the communication performed with the mobile communication relay system which concerns on embodiment of this invention. It is a figure which shows the structure of the circuit board and patch antenna which concern on embodiment of this invention. It is sectional drawing in the VI-VI line of FIG. It is a figure which shows the structure of the circuit board and patch antenna which concern on embodiment of this invention. It is a figure which shows the directivity of the patch antenna which concerns on this Embodiment. It is a figure which shows the directivity of the antenna which does not have a radio wave reflector.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a communication system 100 including a mobile communication relay system according to the present embodiment.

The communication system 100 uses a TDD (Time
Communication by Division Duplex). The base station apparatus 200 includes donor apparatuses 320, 340, and 360, remote apparatuses 420, 440, and 460, and mobile station apparatuses 520, 540, and 560. The number of base station devices, donor devices, remote devices, and mobile station devices shown here is an example.

  Base station apparatus 200 is connected to a network including a server (not shown) via a wire and performs communication.

  Donor apparatus 320 establishes synchronization with base station apparatus 200 and performs wireless communication. Similarly, each of the donor apparatuses 340 and 360 establishes synchronization with the base station apparatus 200 and performs wireless communication.

  The donor device 320 establishes synchronization with the remote device 420 and performs wired communication. Similarly, each of the donor apparatuses 340 and 360 establishes synchronization with each of the remote apparatuses 440 and 460 and performs wired communication.

  The configuration of the donor device 320 is shown below. FIG. 2 is a block diagram showing a configuration of donor apparatus 320 according to the present embodiment. Donor devices 340 and 360 have the same configuration as donor device 320.

  The donor device 320 includes a wireless communication unit 322, a wired communication unit 324, and an activation control unit 326.

  The wireless communication unit 322 includes a patch antenna 328 and a synchronization establishment unit 330. The wireless communication unit 322 has a function of executing wireless communication with the base station apparatus 200 using the patch antenna 328. The wireless communication unit 322 transmits a signal input from the wired communication unit 324 and transmitted from the remote device 420 to the base station device 200, and outputs a signal received from the base station device 200 to the wired communication unit 324.

  The synchronization establishment unit 330 of the wireless communication unit 322 holds a predetermined reference signal, and a reference signal from among signals received by the wireless communication unit 322 in a state where synchronization with the base station apparatus 200 is not established. A matching signal is detected, the detected part is determined to be the head (preamble) of the frame in the received signal, and synchronization with the base station apparatus 200 is established.

  The wired communication unit 324 has a function of executing wired communication with the remote device 420. The wired communication unit 324 transmits a signal input from the wireless communication unit 322 and transmitted from the mobile station device 520 to the remote device 420, and outputs a signal received from the remote device 420 to the wireless communication unit 322.

  The activation control unit 326 sets the arrival timing and cycle of the preamble transmitted from the base station device 200 to the timing and cycle in the operation clock of the activation control unit 326 after the synchronization establishing unit 330 establishes synchronization with the base station device 200. Conversion is performed and the remote device 420 is notified of the timing and period obtained. Based on this timing and cycle, the remote device 420 generates a preamble and executes communication with the mobile station device 520.

  The remote device 420 establishes synchronization with the mobile station device 520 and performs wireless communication. Similarly, each of the remote devices 440 and 460 establishes synchronization with each of the mobile station devices 540 and 560 and performs wireless communication.

  FIG. 3 is a diagram showing a mobile communication relay system 102 which is a part of the communication system 100 according to the present embodiment. Donor device 320 performs wireless communication (first wireless communication) with base station device 200. The donor device 320 and the remote device 420 perform wired communication. The remote device 420 performs wireless communication (second wireless communication) with the mobile station device 520 based on the content of wireless communication (first wireless communication) with the donor device 320.

  The donor device 320 and the remote device 420 are provided on the inner wall of the building 500. A mobile station device 520 that performs wireless communication with the remote device 420 is located in the building 500. Arrows A, B, C, and D indicate exchange of signals between the base station apparatus 200 and the donor apparatus 320 and between the remote apparatus 420 and the mobile station apparatus 520.

  FIG. 4 is a diagram showing the timing of communication performed in the mobile communication relay system 102 according to the present embodiment shown in FIG. As shown in FIG. 4, the transmission (A) from the base station apparatus 200 to the donor apparatus 320 and the transmission (C) from the remote apparatus 420 to the mobile station apparatus 520 are performed at the same time. Transmission (B) to the station apparatus 200 and transmission (D) from the mobile station apparatus 520 to the remote apparatus 420 are performed simultaneously.

  Here, communication resources (communication channel defined by frequency) used in transmission (A) from base station apparatus 200 to donor apparatus 320 and transmission (C) from remote apparatus 420 to mobile station apparatus 520 The communication resource to be overlapped at least partially. Further, at least a part of communication resources used in transmission (B) from donor apparatus 320 to base station apparatus 200 and communication resources used in transmission (D) from mobile station apparatus 520 to remote apparatus 420 Overlap.

  The donor device 320 includes a circuit board 600 on which circuit components 606 and 608 having at least a part of the functions of the donor device 320 are provided, and a patch antenna 328 provided on one surface 602 side of the circuit board 600. In the circuit board 600, one surface 602 provided with the patch antenna 328 faces a direction in which radio waves from the base station device 200 arrive, and the other surface 604 has second wireless communication (the remote device 420 and the mobile station device 520). It is provided so as to face the direction of the area where wireless communication is performed.

  The patch antenna 328 has directivity in the vertical direction with respect to one surface 602 of the circuit board 600 on the opposite side of the circuit board 600 with respect to the patch antenna 328. The patch antenna 328 includes a radiating portion, a spacer, and a ground plane. FIG. 5 is a diagram showing a configuration of the circuit board 600 and the patch antenna 328 according to the present embodiment. 6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 7 is a diagram showing the configuration of the circuit board 600 and the patch antenna 328 according to the present embodiment. As shown in FIG. 7, a double-sided tape 612 b is attached to the surface of the support portion 610 on the circuit board 600 side, and the support portion 610 is fixed to one surface 602 of the circuit board 600 by the double-sided tape 612 b. A double-sided tape 612a is attached to the surface of the support portion 610 opposite to the circuit board 600, and a patch antenna 328 is provided on the surface of the double-sided tape 612a opposite to the support portion 610. The support portion 610 and the patch antenna 328 are fixed by the double-sided tape 612a.

  The circuit board 600 is composed of FR-4 made of glass epoxy and having a conductive layer 614 made of copper formed on at least a part of its surface. The conductive layer 614 is connected to a ground (not shown). Further, the conductive layer 614 reflects the radio wave in the direction of arrow E in FIG. 6 in the reverse direction (the direction of arrow F) and reflects the radio wave in the direction of arrow G in the reverse direction (the direction of arrow H). Also acts as a plate.

  The support portion 610 has a planar shape and is made of an ABS resin that is an insulator. The support unit 610 includes a protrusion 616 for positioning the circuit board 600 and the patch antenna 328.

  Patch antenna 328 includes a radiating portion, a spacer, and a ground plane. The patch antenna 328 is formed using a PPE (polyphenyl ether) substrate having copper layers formed on both sides. A part of the copper layer formed on the surface of the PPE substrate opposite to the circuit substrate 600 (one surface 618 of the PPE substrate) is scraped off by etching or the like to form a copper wiring (wiring). Both ends of the copper wiring are respectively connected to conductive wires 628 that pass through the through holes 622. The copper wiring radiates radio waves when a current is passed through the conducting wire 628 and acts as a radiating portion of the patch antenna 328. The copper layer formed on the surface of the PPE substrate on the circuit board 600 side (the other surface 620 of the PPE substrate) is connected to the ground as it is and functions as a ground plane of the patch antenna 328. Furthermore, at least a part of the part of the conductive wire 628 that protrudes from the through hole 622 to the other surface 620 side of the PPE substrate has a ground that coaxially surrounds the part. This ground is soldered to a copper layer formed on the other surface 620 of the PPE substrate. The portion made of PPE between the copper layer formed on one surface 618 of the PPE substrate and the copper layer formed on the other surface 620 of the PPE substrate is the distance between the radiation portion and the ground plane. Acts as a spacer to ensure

  Further, the patch antenna 328 is provided with two power supply units (not shown). One of the power feeding units performs power feeding so that the radio wave generated by the patch antenna 328 is vertically polarized, and the other performs power feeding so that the radio wave generated by the patch antenna 328 is horizontally polarized.

  The surface of the support portion 610 facing the circuit board 600 has a shape that is partially cut away, and has a recess 624 that is separated from one surface 602 of the circuit board 600. A circuit component 606 such as a power supply bypass capacitor is provided in a region of the one surface 602 of the circuit board 600 facing the recess 624. In this region, among the circuit components having at least a part of the function of the donor device 320, circuit components that are relatively less susceptible to radio waves are provided.

  A circuit component 608 such as an RF circuit or a digital circuit is provided on the other surface 604 of the circuit board 600. The other surface 604 is provided with a circuit component that is relatively susceptible to radio waves among circuit components having at least a part of the function of the donor device 320.

  Further, the patch antenna 328 is provided with an attenuator 626. The gain of the patch antenna 328 is adjusted by the attenuator 626. For example, when the antenna gain is defined by a communication standard or the like, the gain is adjusted by the attenuator 626.

  According to the above configuration, of the radio waves radiated from the patch antenna 328, the component in the direction of the remote device 420 is reflected by the conductive layer 614 that is a radio wave reflector. Therefore, the signal indicated by B in FIGS. 3 and 4 is not received by the remote device 420. In addition, radio waves radiated from the remote device 420 are reflected by the conductive layer 614. Accordingly, the signal indicated by C in FIGS. 3 and 4 is not received by the donor device 320.

  FIG. 8 is a diagram showing the directivity of the patch antenna 328 according to the present embodiment. FIG. 9 is a diagram showing the directivity of an antenna that does not have a radio wave reflector. 8 and 9, the upward direction is the direction of the base station apparatus 200, and the downward direction is the direction of the remote apparatus 420. Compared to the case of FIG. 9 that does not have a radio wave reflector, the directivity in the direction of the remote device 420 is kept low in FIG.

  Furthermore, according to the present embodiment, since it is not necessary to separately provide a radio wave reflector, a thinner donor device 320 can be realized as compared with a case where a radio wave reflector is newly provided. Further, since the circuit components are provided on both the one surface 602 and the other surface 604 of the circuit board 600, a smaller donor device 320 can be realized as compared with the case where the circuit component is provided on one surface or when a new circuit board is provided. .

  In the present embodiment, the mobile communication relay system 102 and the donor device 320 compliant with the Wimax method and equipped with the patch antenna 328 are shown. However, the present invention is not limited to this configuration, and the radio wave directivity is limited. The present invention can be applied to any necessary communication system and communication apparatus, and can also be applied to a communication system and communication apparatus that use an antenna other than a patch antenna.

  In this embodiment, the conductive layer 614 is formed on the entire surface 602 of the circuit board 600. However, the conductive layer 614 needs to be formed on the entire surface 602 of the circuit board 600. Alternatively, it may be partially removed by etching or the like, for example. Further, a film made of a conductor may be fixed to the circuit board 600 by screws or the like.

  In this embodiment, the circuit board 600 is FR-4, the conductive layer 614 is a copper layer of FR-4, the support part 610 is ABS resin, and the patch antenna 328 is a PPE board on which copper layers are formed on both sides. Although the structure formed using each is shown, material is not restricted to these. The conductive layer 614 may be made of another material having radio wave reflectivity, the support part 610 and the spacer of the patch antenna 328 may be made of other insulators, and the radiating part and the ground plane of the patch antenna 328 are You may consist of another material which has electroconductivity.

  DESCRIPTION OF SYMBOLS 100 Communication system, 102 Mobile communication relay system, 200 Base station apparatus, 320, 340, 360 Donor apparatus, 322 Wireless communication part, 324 Wired communication part, 326 Startup control part, 328 Patch antenna, 330 Synchronization establishment part, 420, 440, 460 Remote device, 500 building, 520, 540, 560 Mobile station device, 600 Circuit board, 602 One surface of the circuit board, 604 The other surface of the circuit board, 606, 608 Circuit component, 610 Support, 612a, 612b Double-sided tape, 614 conductive layer, 616 protrusion, one surface of 618 PPE substrate, the other surface of 620 PPE substrate, 622 through-hole, 624 depression, 626 attenuator, 628 conductor.

Claims (5)

A first communication device that performs first wireless communication with a base station device;
A second communication device that performs second wireless communication with the mobile station device,
A mobile communication relay system in which a communication resource used in the first wireless communication and a communication resource used in the second wireless communication overlap at least in part,
The first communication device is
A circuit board on which circuit components are provided;
An antenna provided on one surface side of the circuit board,
The circuit board is provided such that the one surface faces the direction of arrival of radio waves from the base station apparatus, and the other surface faces the direction of the area where the second wireless communication is performed,
The mobile communication relay system, wherein the circuit board has a conductive layer that reflects radio waves on the one surface. The mobile communication relay system according to claim 1,
A support portion fixed to the one surface and supporting the antenna;
Of the support portion, at least a part of the surface facing the one surface is separated from the one surface,
Among the circuit components, a circuit component having a thickness equal to or less than the distance between the one surface and the support portion is provided in a region of the one surface that is separated from the support portion.
A mobile communication relay system, wherein a circuit component is provided on the other surface. The mobile communication relay system according to claim 1 or 2,
The antenna is a patch antenna that has directivity in the vertical direction with respect to the one surface on the opposite side of the circuit board with respect to the antenna, and generates at least one of horizontal polarization and vertical polarization. A mobile communication relay system. In the mobile communication relay system according to any one of claims 1 to 3,
The antenna includes a substrate made of a non-conductive resin, a wiring provided on a surface of the substrate opposite to the circuit substrate, and radiating radio waves by an externally supplied current, and the circuit board side of the substrate And a ground plate provided on the surface of
The mobile communication relay system, wherein the support portion is made of a non-conductive resin. A circuit board;
An antenna provided on one surface side of the circuit board,
In the circuit board, the one surface is directed to the arrival direction of radio waves from the base station device that performs the first wireless communication with the communication device, and the other surface is the second by the mobile station device and the other communication device. It is provided to face the direction of the area where wireless communication is performed,
The circuit board has a conductive layer that reflects radio waves on one surface thereof.

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