JP2012204893A - Wireless device, and wireless interference reduction method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless interference reduction method for a wireless device capable of reducing wireless interference between both wireless processing devices in the case that the wireless device has two or more wireless processing devices.SOLUTION: A wireless relay device 100 has: a first wireless (A) processing device 12 processing a wireless signal A having a frequency A; a second wireless (B) processing device 13 processing a wireless signal B having a frequency B different from the frequency A; an antenna part 10 having a plurality of antennas shared by the first wireless (A) processing device 12 and the second wireless (B) processing device 13; a switching array 14 connecting between the plurality of antennas, and the first wireless (A) processing device 12 and the second wireless (B) processing device 13; and a relay processing device 11 controlling the switching of the switching array 14.

Description

  The present invention relates to a radio apparatus equipped with a plurality of antennas and a plurality of radio processing apparatuses, and a radio interference mitigation method thereof.

  In recent years, cloud services and the like have increased along with ubiquity, and there has been an increasing need to exchange information with a portable information terminal even when away from home. Along with this, information terminals such as mobile PCs (Personal Computers), netbooks, smartphones, and the like that are small and easy to carry are becoming popular.

  These information terminals are equipped with a wireless communication technique called wireless LAN, and use a frequency band (2.4 GHz) belonging to an ISM (Industry-Science-Medical) band. The wireless LAN adopts an access control method called CSMA / CA (Carrier Sense Multiple Access / Collision Avoidance), which is different from other communication radio waves using the same frequency band. In the case where a collision occurs, communication is resumed by a method of restarting communication after a short time, and communication is maintained by retransmitting data immediately even if a collision occurs.

  Wireless LANs are treated as wireless stations for low-power data communication systems, so there is no need for a license for operating wireless stations, and the communication range is limited to a few hundred meters, but it can be used as an easy means of connecting to the Internet. Widely used in equipment.

  On the other hand, in the 2.5 GHz band close to the ISM band (2.4 GHz), a network for wide-area wireless communication called WiMAX (Worldwide Interoperability for Microwave Access) (registered trademark) is operated. WiMAX can communicate over a wide range centering on a base station based on wireless LAN communication technology.

  Unlike wireless LAN, WiMAX is a system that centrally manages access control with each mobile station on the base station side, and TDD (Time Division Duplex) system and FDD (Frequency Division Duplex) as transmission / reception timing ) Method is defined.

  The TDD method is one of methods for realizing simultaneous transmission / reception (duplex communication) by wireless communication or the like, and is a method of finely dividing a communication path on a time axis and switching between transmission and reception at high speed. Is called. Communication between a mobile phone base station and a terminal must be performed in both directions at the same time, but communication in both directions at the same frequency is not possible. In TDD, simultaneous transmission and reception are realized in a pseudo manner by switching between transmission and reception many times in a short time. In TDD, the same frequency is used for uplink and downlink, and the direction is switched every time. Therefore, only one frequency is used, and a system with many subscribers can be handled.

  On the other hand, a method for performing simultaneous transmission and reception by dividing a frequency band into transmission and reception is called FDD. FDD is a method of securing separate frequencies for uplink and downlink, and can simplify the structure of the telephone, but is not very good in terms of radio wave utilization efficiency.

  In the third generation (3G) mobile phone standard IMT-2000 (International Mobile Telecommunication 2000), W-CDMA (Wideband Code Division Multiple Access) and CDMA2000 adopt the FDD method, and TD-CDMA (Time Division-Code Division Multiple). Access: Time division duplex-code division multiple access) and TD-SCDMA (Time Division Synchronous Code Division Multiple Access) employ TDD. Also, PHS (Personal Handy-phone System), ISDN (Integrated Services Digital Network), etc. adopt the TDD system.

  By adopting the above TDD method and FDD method as the transmission / reception timing, the radio waves transmitted by each mobile device do not collide in the air. In consideration of power consumption on the mobile device side, control that suppresses transmission power on the mobile device side according to the distance from the base station is led by the base station.

  Recently, MIMO (Multi Input Multi Output), which uses multiple antennas as a wireless communication technology, multiplexes multiple transmission paths in space and dramatically increases communication capacity. Technology is known. Since wireless LAN and WiMAX are one of the technologies adopting MIMO, a plurality of antennas are mounted on a communication device equipped with these communication methods.

  In addition to WiMAX, communication technologies such as LTE (Long Term Evolution) have begun to spread as wide-area wireless communication methods. However, these wide-area wireless devices require advanced communication processing and are not easy to design. Most of the terminals used by are not compatible with wide area wireless communication, and most of them are only compatible with wireless LAN communication. Therefore, as shown in FIG. 7, there is an increasing demand for a wireless relay apparatus 302 that can connect to a wireless LAN terminal 301 via a wireless LAN and communicate with a WiMAX base station 303 that forms a wide-area wireless network instead of the terminal. ing.

  Such a wireless relay device relays communication data between wireless networks using, for example, two wireless communication technologies. In this case, in order to transmit and process two radio waves, the radio relay apparatus needs to be equipped with individual antennas that can correspond to the respective radio technologies.

  By the way, in such a wireless relay device, the distance between the antennas becomes close, and the other antenna receives the radio wave transmitted by one antenna. In this case, radio waves with different radio systems are regarded as noise, leading to a significant deterioration in reception performance. In addition, the influence becomes greater as the frequency bands used by the respective wireless networks become closer.

  Specifically, as the wireless relay device in which such a problem occurs, as shown in FIG. 8, a wireless LAN processing device 332 that performs wireless LAN communication and a WiMAX processing device 331 that performs WiMAX (Worldwide Interoperability for Microwave Access) communication. And a wireless relay device 300 that performs wireless relay between the wireless LAN and WiMAX. The wireless relay device 300 also includes a relay processing device 311 that controls wireless relay between the wireless LAN and WiMAX. The wireless LAN is communication using the ISM band (2.4 GHz band), and WiMAX is a communication system using the 2.5 GHz band.

  Now, it is assumed that the wireless relay device 300 relays and transfers data acquired from the WiMAX side to the wireless LAN side in response to a request from a terminal connected to the wireless LAN. At this time, the radio waves received by the WiMAX antennas 322 and 323 are demodulated into digital signals by the WiMAX processing device 331, pass through the relay processing device 311, and are modulated into analog signals by the wireless LAN processing device 332. This is transmitted as a wireless LAN radio wave from the wireless LAN antenna 321 to the slave unit.

  However, the wireless LAN radio wave transmitted at that time is also received by the WiMAX antennas 322 and 323 included in the wireless relay device 300. FIG. 9 shows the state of radio waves received by WiMAX antennas 322 and 323 at this time. FIG. 9 is a graph showing the relationship between frequency and power, with power on the vertical axis and frequency on the horizontal axis.

  As shown in FIG. 9, when a wireless LAN radio wave is transmitted in the 2.4 GHz band while the wireless relay device 300 is receiving a WiMAX radio wave, the WiMAX antennas 322 and 323 are connected to the WiMAX radio wave from the base station. A wireless LAN radio wave is received. A radio wave 342 shown in FIG. 9 is a wireless LAN radio wave transmitted by the wireless relay device 300, and an aerial power 341 is an aerial power received by the WiMAX antennas 322 and 323. The reception intensity of the wireless LAN radio wave 342 is lowered by the transmission path loss 344 between the wireless LAN antenna 321 and the WiMAX antennas 322 and 323 of the wireless relay device 300.

  On the other hand, the radio wave 343 is a WiMAX radio wave transmitted from the WiMAX base station, and the 2.5G band aerial power 341 decreases due to the transmission path loss 345 from the WiMAX base station to the WiMAX antennas 322 and 323 of the wireless relay device 300. ing. At this time, when noise power generally existing in the natural world, that is, noise power when there is no interference due to the wireless LAN radio wave 342, is E0, the noise power when receiving interference from the wireless LAN radio wave 342 increases to E1. . Accordingly, if the original CINR (Carrier to Interference and Noise Ratio) at the time of no interference is C0, the CINR when receiving interference from the wireless LAN radio wave 342 is reduced to C1. End up.

  That is, the 2.4 GHz band wireless LAN radio wave increases the noise power E0 of the 2.5 GHz band to E1 due to modulation distortion, and as a result, CINRC0 of the WiMAX radio wave 343 decreases to C1, that is, deteriorates. The deterioration of CINR becomes a problem because the range in which WiMAX radio waves transmitted from the base station can be received is narrowed.

  Conventionally, a plurality of countermeasures have been studied as countermeasures against reception radio wave interference generated between a plurality of wireless transmission paths. For example, Patent Document 1 focuses on the fact that no appreciation occurs during simultaneous transmission and reception with respect to a plurality of wireless networks, and a wireless relay device and a wireless communication device for the purpose of avoiding interference between the plurality of wireless networks. A relay method is disclosed. This wireless relay device is a wireless relay device of a wide-area wireless communication network (WiMAX) and a small-range wireless communication technology (WLAN). When the wide-area wireless technology is a TDD system, the wireless LAN circuit transmits radio waves. The timing of the transmission is matched with the timing at which the WiMAX side transmits radio waves. This method allows each radio circuit mounted on the radio relay device to receive simultaneously and transmit at the same time so that the transmission / reception timing does not overlap so that the self can receive the radio waves transmitted by itself. Therefore, radio wave interference can be suppressed.

JP 2010-56653 A JP 2010-199922 A JP 2010-074807 A1

  However, in order to apply the technology described in Patent Document 1, it is necessary to perform advanced time synchronization between the wide area wireless communication network and the small-range wireless communication. Due to circumstances, separate processing devices often perform transmission / reception processing, and there is a problem that it is difficult to time-synchronize wireless operations. Moreover, since the technique of patent document 1 presupposes that the WiMAX side is a TDD system, there also exists a problem that it cannot apply when using the FDD system.

  Similarly, techniques for avoiding radio interference include a radio relay apparatus and a radio relay method described in Patent Document 2, and a wireless Internet connection repeater without signal interference described in Patent Document 3. In these methods, each radio processing operation is intermittently operated in a time-sharing manner to avoid airwave interference in the air. These methods have a problem that the maximum communication capacity as a communication line is reduced due to the time division of the wireless operation.

  The present invention has been made in order to solve such a problem, and does not perform an operation that hinders each wireless processing operation, and maximizes the original communication capacity of each wireless communication line. It is an object of the present invention to provide a radio apparatus capable of performing the above and a method for reducing radio interference of the radio apparatus.

  A radio apparatus according to the present invention includes a first radio processing apparatus that processes a radio signal having a first frequency, a second radio processing apparatus that processes a radio signal having a second frequency different from the first frequency, and A plurality of antennas shared by the first and second wireless processing devices, a switching array for connecting the plurality of antennas to the first and second wireless processing devices, and switching of the switching array are controlled. And a control unit.

  A radio interference mitigation method according to the present invention includes a first radio processing device that processes a radio signal having a first frequency, and a second radio processing device that processes a radio signal having a second frequency different from the first frequency. A wireless interference reduction method for a wireless device equipped with a first antenna that is an optimum antenna for the first wireless processing device from a plurality of antennas shared by the first and second wireless processing devices. The first antenna is selected, the radio signal received by the first antenna is processed by the first radio processing device, and the plurality of antennas excluding the first antenna are sent to the second radio processing device. The second antenna, which is the most suitable antenna, is selected, and the radio signal received by the second antenna is processed by the second radio processing apparatus.

  ADVANTAGE OF THE INVENTION According to this invention, the radio interference reduction method of the radio | wireless apparatus which can reduce the radio interference between both in the case of having two or more radio | wireless processing apparatuses can be provided.

It is a figure which shows the radio relay apparatus concerning Embodiment 1 of this invention. It is a figure which expands and shows the antenna part 10 and the switching array 14 of the radio relay apparatus concerning Embodiment 1 of this invention. It is a block diagram which shows the wireless relay apparatus which relays the data between the wireless LAN communication concerning Embodiment 2 of this invention, and WiMAX communication. It is a flowchart which shows operation | movement of the radio relay apparatus concerning Embodiment 2 of this invention. It is a figure which shows the transmission line loss (Table 1) between each antenna. It is a graph which shows the electric power which the WiMAX antenna of the radio relay apparatus 200 concerning Embodiment 2 of this invention receives. It is a figure which shows the relationship between a wireless LAN terminal, a wireless relay apparatus, and a WiMAX base station. It is a figure which shows the conventional wireless relay apparatus. It is a graph which shows the relationship of the frequency-power in the conventional wireless relay apparatus by taking electric power on a vertical axis | shaft and frequency on a horizontal axis.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. In this embodiment, the present invention is applied to a radio relay apparatus that can reduce interference between radio waves even when a plurality of radio processing apparatuses are mounted. In addition, the present invention can be applied to communication devices such as mobile phones and wireless routers that have a plurality of antennas in one product and need to use different communication methods.

Embodiment 1 of the present invention.
The radio relay apparatus according to the present embodiment reduces the reception radio wave interference of air battle power transmitted from each antenna, which occurs between the antenna transmission paths, in a radio relay apparatus equipped with two or more radio processing apparatuses. It is. This is particularly effective when data is exchanged between two wireless networks operating in close frequency bands and having different communication methods.

  FIG. 1 is a diagram illustrating a wireless relay device according to a first embodiment of the present invention. As illustrated in FIG. 1, the wireless relay device 100 includes an antenna unit 10, a switching array 14, a first wireless (A) processing device 12, a second wireless (B) processing device 13, and a relay processing device 11.

  The first radio (A) processing device 12 processes a radio signal of a communication system A (a radio signal used in the radio system A is a radio signal A and its frequency is a radio frequency A). The second wireless (B) processing device 13 processes a wireless signal of a communication method B (a wireless signal used in the wireless method B is a wireless signal B and its frequency is a wireless frequency B).

  The relay processing device 11 receives the communication content from the first wireless (A) processing device 12 and the second wireless (B) processing device 13, respectively, and depending on the received communication content, the communication content is transmitted through one of the wireless processing devices. A process of transmitting to the other wireless network is performed. That is, the relay processing device 11 performs data transfer between the two wireless processing devices. The switching array 14 is configured to transmit the air battle power of the wireless A and the wireless B from any one of the plurality of antennas 1 to 5, so that the first wireless (A) processing device 12 and the second wireless (B) processing device 13 are transmitted. And a path between the antenna unit 10 and the antenna unit 10 are switched. The antenna unit 10 includes a plurality of antenna groups that can be used in frequency bands used by both the radio A and the radio B.

  Although only antennas 1 to 5 are shown in FIG. 1, the number of antennas may be 5 or more and less than 5. However, at least a part of these antennas is shared by the first wireless (A) processing device 12 and the second wireless (B) processing device 13.

  Hereinafter, the wireless relay device 100 will be described in more detail. The first wireless (A) processing device 12 and the second wireless (B) processing device 13 are wireless processing devices that process wireless signals having different frequencies. The antennas 1 to 5 of the antenna unit 10 are configured to receive a radio signal of any frequency processed by the first radio (A) processing device 12 and the second radio (B) processing device 13. In the embodiment, it is assumed that all antennas of the antenna unit 10 are shared by the first wireless (A) processing device 12 and the second wireless (B) processing device 13.

  The relay processing device 11 selects, for example, an optimal antenna (first antenna) for the first radio (A) processing device 12 from a plurality of antennas, and an antenna obtained by removing the first antenna from the plurality of antennas. Therefore, the second wireless (B) processing device 13 functions as a control unit that controls the switching array 14 so as to select an optimum antenna (second antenna).

  The relay processing device 11 also selects an optimum antenna (first antenna) for the second radio (B) processing device 13 from the plurality of antennas, and removes the first antenna from the plurality of antennas. It is also possible to control the switching array 14 so as to select an optimum antenna (second antenna) for the first wireless (A) processing device 12 from the antenna. Here, the case where the antenna of the 1st radio | wireless (A) processing apparatus 12 is selected first is demonstrated.

  Here, the required number of first antennas is selected from the antenna unit 10 from the antenna unit 10 having the highest probability that the reception intensity of the radio signal A to be received by the first radio (A) processing device 12 is the highest. In this case, the reception intensity of the radio signal A can be measured by the antenna unit 10, and the required number can be selected from those having the highest reception intensity. Alternatively, the first antenna can be selected based on the positional relationship between the positions of the antennas 1 to 5 and the base station (referred to as base station A) that transmits the radio signal A. For example, when the base station A is in the upper left direction on the page, the antenna 1 closest to the base station A can be selected.

  On the other hand, the required number of second antennas can be selected from the antennas having the largest transmission path loss with respect to the antenna 1. In this case, the second antenna can be selected based on the transmission path loss measurement result with the antenna 1 that has been measured in advance. Alternatively, the wireless relay device 100 can measure the transmission line loss with the antenna 1 and select based on the measurement result. Here, simply because the antenna 5 that is the farthest from the antenna 1 is considered to have the largest transmission path loss with the antenna 1, the antenna 5 is used as the second antenna, that is, the second radio (B). It can be selected as the antenna of the processing device 13.

  In addition, the relay processing device 11 can also adjust the strength of the radio signal output from the antenna of the antenna unit 10. The relay processing device 11 may receive an instruction about the strength of the radio signal from the base station of each radio network. In this case, based on the instruction, the relay processing device 11 instructs the first wireless (A) processing device 12 and the second wireless (B) processing device 13 to increase the strength of the radio signal output from the antenna unit 10. Give instructions.

  Further, the strength of the radio signal received by the antenna of the antenna unit 10 is monitored, and connection and disconnection to the wireless network are controlled based on the monitoring result. That is, when the reception strength of the antenna is lower than a predetermined value, it is considered that reception is impossible, and the connection to the wireless network is disconnected for power saving or the like.

  Here, for example, the first wireless (A) processing device 12 is a wireless processing device that processes a wireless signal of the WiMAX standard, and the second wireless (B) processing device 13 is a wireless device having a frequency used in the wireless LAN. A wireless processing device that processes signals can be used. In this case, the first radio (A) processing device 12 processes a radio signal having a frequency of 2.5 GHz band, and the second radio (B) processing device 13 processes a radio signal having a frequency of 2.4 GHz band. . That is, when using radio signals of close frequencies in this way, mutual radio wave interference between antennas increases. Therefore, in the present embodiment, as described above, the antenna 1 is selected as the antenna for the first radio (A) processing device 12, and the antenna 5 is selected as the antenna for the second radio (B) processing device 13. is doing. Since these antennas have selected the antenna unit 10 that has the highest transmission path loss between the two antennas, it is possible to reduce interference between the radio waves between the antennas as much as possible.

  FIG. 2 is an enlarged view showing the antenna unit 10 and the switching array 14. Each antenna 1 to 6 of the antenna unit 10 is configured to be connectable to both the first wireless (A) processing device 12 and the second wireless (B) processing device 13, and this is controlled by the switching array 14. If necessary, a specific antenna is connected to a specific wireless processing device. A switching control signal for controlling the switching array 14 is input from the relay processing device 11 to the switching array 14.

  In the present embodiment, a plurality of wireless processing devices 12 and 13 having different communication methods, an antenna unit 10 including a plurality of antennas that can be used by each wireless processing device 12 and 13, a plurality of antennas, A circuit connection switching device (switching array) 14 capable of freely selecting connection with the wireless processing devices 12 and 13 and wireless management capable of monitoring and setting wireless processing setting values of the respective wireless processing devices 12 and 13 A device (relay processing device) 11 is included. As described above, since the plurality of radio processing apparatuses 12 and 13 share a plurality of antennas, the degree of freedom in selecting the optimum antenna is large. Therefore, it is possible to select the optimum antenna for each radio processing apparatus 12 and 13. it can.

  In addition, since the relay processing device 11 can receive the data packet received by each of the wireless processing devices 12 and 13 and can mutually transfer the data to other wireless processing devices, the relay processing device 11 receives the data packet, for example, by the antenna 5. The wireless signal B is demodulated, and an analog signal of the data is generated by the first wireless (A) processing device 12 via the relay processing device 11 and can be transmitted as the wireless signal A via the antenna 1.

  Further, when the plurality of wireless processing devices 12 and 13 are two wireless processing devices compatible with the wireless LAN and WiMAX communication systems, the WiMAX side antenna is selected with priority given to the communication status of the WiMAX network, and then the wireless LAN is selected. By selecting the antenna, the wireless interference from the wireless LAN communication with respect to the WIMAX communication can be minimized, and the performance of the WiMAX communication can be maximized.

Embodiment 2 of the present invention.
Next, a second embodiment of the present invention will be described. In the present embodiment, a wireless LAN-WiMAX wireless relay apparatus that wirelessly relays between a wireless LAN nutwork and a WiMAX network will be described.

  FIG. 3 is a block diagram showing a wireless relay device that relays data between the wireless LAN communication and the WiMAX communication according to the embodiment of the present invention. This apparatus transfers a data packet received from a WiMAX communication network to a terminal connected to the wireless LAN, and conversely has a function of transmitting a data packet received from a terminal connected to the wireless LAN to the WiMAX communication network. It is a relay device.

  A wireless relay device (wireless LAN-WiMAX relay device) 200 according to the present embodiment shown in FIG. 3 includes an antenna unit 30 having antennas 31 to 35, a switching array 14, a WiMAX processing device 21, and a wireless LAN processing device. 22 and the relay processing device 11.

  The antenna unit 30 includes antennas 31, 32, 33, 34, and 35. Each antenna 31 to 35 has directivity with respect to the direction in which the antennas 31 to 35 are mounted from the center of the apparatus, and the air battle against the air. It is configured to transmit and receive power. In this case, the antennas are preferably arranged so as to be separated from each other.

  The switching array 14 is a processing device that performs switching control between the plurality of antennas 31 to 35 and the plurality of wireless processing devices 31 and 32, and WiMAX that specifies analog signals received from the antennas 31 to 35 according to the switching control. Connect to the processing device 21 and the wireless LAN processing device 22.

  The wireless LAN processing device 22 demodulates the input analog signal according to the operating principle defined by the wireless LAN, and the digital data obtained from the analog signal is another processing device, in this embodiment. And output to the WiMAX processing device 21. In another embodiment, in this embodiment, the digital data input from the WiMAX processing device 21 is modulated according to the operating principle defined by the wireless LAN, and the generated analog signal is converted to the switching array 14. Through the antenna 31 to 35.

  The WiMAX processing device 21 demodulates the input analog signal based on the operating principle prescribed by WiMAX, and the digital data obtained from the analog signal is another processing device, which is a wireless LAN in this embodiment. The data is output to the processing device 22. In another embodiment, in this embodiment, the digital data input from the wireless LAN processing device 22 is modulated based on the operating principle defined by WiMAX, and the generated analog signal is converted to the switching array 14. Through the antenna 31 to 35.

  The relay processing device 11 is connected to the WiMAX processing device 21 and the wireless LAN processing device 22, and is connected to a first function for transferring digital data input from one processing device to the other processing device. A second function for setting the analog signal strength that the wireless processing devices 31 and 32 output to the antennas 31 to 35 and a third function for monitoring the reception strength value of the analog signal received by the antennas 31 to 35 And a fourth function for controlling connection / disconnection to / from the WiMAX network and a fifth function for controlling a connection path of the switching array 14.

  The WiMAX processing device 21 has a function of simultaneously receiving signals from two antennas as an analog signal interface. In this example, the WiMAX processing device 21 is assumed to be connected to the antenna 31 and the antenna 32 as an initial state.

  In this example, the wireless LAN processing device 22 is assumed to be connected to the antenna 34 as an initial state.

  Here, it is assumed that the relationship of the transmission line loss between the antennas is as shown in Table 1. Further, as shown in FIG. 3, the WiMAX base station is assumed to exist in the upper right direction as viewed in the figure.

  The operation of connecting to the WiMAX network and relaying radio waves to the wireless LAN in the wireless relay device 200 having such a configuration will be described. FIG. 4 is a flowchart showing the operation of the wireless relay device 200 according to the present embodiment.

  As illustrated in FIG. 4, it is assumed that the wireless relay device 200 enters an area where a WiMAX network base station radio wave can be received and shifts to a connectable state. When the WiMAX processing device 21 knows that the antenna 31 and the antenna 32 have entered the WiMAX range by receiving signals from the base station (step S1), the relay processing device 11 is connected to the WiMAX network. The fact that it has become possible is notified (step S2). The determination as to whether or not the connection is possible can be made based on, for example, the received signal strength indication (RSSI) received by the antenna and the CINR goodness of the WiMAX signal.

  Next, the relay processing device 11 controls the switching array 14 to reconnect the antenna connected to the WiMAX processing device 21 to another antenna (for example, antennas 1 and 3). After the connection change, the relay processing device 11 acquires information on the reception strength from the WiMAX processing device 21 (step S3). These operations are performed for all antennas or antennas that are known to have good reception radio waves (antennas 1, 4,..., Antennas 4 and 5), and WiMAX for multiple antennas is performed. The radio wave reception intensity is acquired (step S4 etc.).

  In this way, the relay processing apparatus 11 records the WiMAX reception intensity for all antenna combinations. In this example, as shown in FIG. 3, the WiMAX base station exists in the upper right of the page, and each antenna has directivity. Therefore, when the antenna 31 and the antenna 35 are selected, the reception strength is the best. Shall be.

  After determining the WiMAX antenna, next, the antenna to be used for the wireless LAN is determined. The antenna for this wireless LAN can be determined based on the transmission path loss between the antennas shown in Table 1 of FIG. Specifically, in this example, since communication with WiMAX is performed by the antenna 31 and the antenna 35, the antennas 32, 33, and 34 can be used. According to Table 1, antenna 34 (18 dB), antenna 33 (15 dB), and antenna 32 (7 dB) have higher transmission path loss than antenna 31 in order. The transmission path loss with respect to the antenna 35 is higher for the antenna 33 (18 dB), the antenna 32 (15 dB), and the antenna 34 (13 dB) in this order.

  In this case, the transmission path loss of the antenna 34 is the highest with respect to the antenna 31, but the transmission path loss of the antenna 34 with respect to the antenna 35 is not so large. In such a case, it is possible to select an antenna having the highest average of both transmission path losses. In this case, the average transmission line loss for both antennas is 11 dB for antenna 32, 16.5 dB for antenna 33, and 15.5 dB for antenna 34, and the transmission line loss is increased for both antennas 31 and 35. It can be seen that the antenna that can transmit is the antenna 33 having the highest average value of the transmission line loss. That is, the antenna 33 can be selected as a wireless LAN antenna (step S5).

  As described above, it can be determined that the antenna 31 and the antenna 35 can obtain the best reception strength for the WiMAX processing device 21, and the antenna 33 is provided for the wireless LAN processing device 22. Since it has been selected, the switching array 14 is controlled (step S6), and the connection is switched so that the antenna 31 and the antenna 35 are used as the WiMAX antenna (step S7).

  Thereafter, the wireless relay device 200 requests the WiMAX processing device 21 to connect to the network, establishes communication with WiMAX (step S8), and starts data packet relay processing between WiMAX and the wireless LAN. . That is, the WiMAX signal received by the antenna 31 and the antenna 35 is input to the WiMAX processing device 21 (step S10), sent from the WiMAX processing device 21 to the relay processing device 11 (step S11), and from the relay processing device 11 It is sent to the wireless LAN processing device 22 (step S12), converted into an analog signal, and transmitted from the antenna 33 to the wireless LAN terminal (step S13).

  In the wireless relay device 200 according to the present embodiment, it is possible to select an optimum antenna for interference between radio waves, and to minimize the wireless LAN signal received by the WiMAX antenna.

  Next, effects in the present embodiment, that is, radio interference that can be reduced by the radio relay apparatus 200 according to the present embodiment will be described. FIG. 6 is a graph showing the relationship between frequency and power, with power on the vertical axis and frequency on the horizontal axis, and shows the power received by the WiMAX antenna of the radio relay apparatus 200 according to the present embodiment. FIG. It can be seen that the CINR of the WiMAX signal is improved as compared with the received signal shown in FIG.

  As described above, when wireless LAN radio waves are transmitted in the 2.4 GHz band while the wireless relay device 200 is receiving WiMAX radio waves, the WiMAX antennas 31 and 35 are connected to the wireless LAN together with WiMAX radio waves from the base station. You will receive radio waves. The radio wave 42 shown in FIG. 6 is a wireless LAN radio wave transmitted by the wireless relay device 200, and the aerial power 41 is the aerial power and aerial power 71 received by the antenna 32 where the transmission path loss between the wireless LAN and WiMAX is not large. The aerial power received by the antenna 31 having a large transmission line loss between the wireless LAN and WiMAX.

  In other words, the wireless LAN radio wave 42 is reduced in reception intensity by the transmission path loss 44 between the wireless LAN antenna 33 and the WiMAX antenna 32 of the wireless relay device 200 and becomes air power 41. In addition, the wireless LAN radio wave 42 is reduced in reception strength by the transmission path loss 72 between the wireless LAN antenna 33 and the WiMAX antenna 31 of the wireless relay device 200 and becomes air power 71. Thus, in this embodiment, since the antennas 31 and 35 having a large transmission line loss with respect to the antenna 33 are selected, the transmission line loss 72 is larger than the transmission line loss 44.

  On the other hand, the radio wave 43 is a WiMAX radio wave transmitted by the WiMAX base station, and the 2.5G band aerial power 71 is reduced due to the transmission path loss 73 from the WiMAX base station to the WiMAX antenna 31 of the wireless relay device 200. However, since the transmission path loss 45 from the WiMAX base station to the WiMAX antenna 32 of the wireless relay device 200 is larger, it is larger than the 2.5G band air power 41.

  At this time, when noise power generally existing in the natural world, that is, noise power when there is no interference by the wireless LAN radio wave 42, is E0, the noise power when the antenna 32 receives interference from the wireless LAN radio wave 42 is E1. Will rise to. On the other hand, in the antenna 31, the noise power when receiving interference from the wireless LAN radio wave 42 is E2, which is much lower than E1. As a result, in the antenna 32 that is not selected by applying this embodiment, the CINR is small as indicated by C1, whereas the antenna selected by applying this embodiment is selected. The CINR at 31 is large as indicated by C2, and it can be seen that the interference caused by the wireless LAN radio wave is reduced.

  As described above, the radio relay apparatus 200 according to the present embodiment has the following effects.

  First, by suppressing the noise power E2 lifted by the wireless LAN signal within the frequency band used for communication by WiMAX to a minimum, the degradation of CINR due to radio wave interference can be reduced.

  Secondly, by selecting the antennas 31 and 35 having the highest reception strength when connecting to WiMAX, it is possible to expect an improvement in the reception environment due to selection diversity, and the radio relay apparatus 200 according to the present embodiment As described above, the reception CINR of the WiMAX signal can be improved as compared with a device that does not have a mechanism for sharing a plurality of antennas and selecting an antenna with the best reception state.

  Third, since multiple antennas are shared by two wireless communication devices, the diversity effect is improved because the number of selectable antennas increases depending on the device that employs MIMO and has to mount many antennas. Can be made.

  It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  For example, in the first and second embodiments described above, the wireless relay device has been described as having two wireless processing devices. However, the number of wireless processing devices to be relayed is not particularly limited, and may be two or more. Needless to say. Further, for example, any relay apparatus in which n (2 is a natural number of 2 or more) wireless processing apparatuses are mounted and N (natural number of n or more) antennas is mounted is applicable.

  Further, even if n wireless processing devices are installed, if all wireless devices do not operate simultaneously, that is, if they are shared and operated in a time division manner, N (≦ n) It is possible to have a single antenna. In addition, this can reduce the number of antennas mounted and reduce the size of the apparatus.

  Furthermore, in Embodiment 2 described above, WiMAX performs centralized access management by the base station, and therefore, it has been described that priority is given to the selection of the WiMAX antenna and measures against reception degradation on the WiMAX side. In order to reduce the radio wave interference that the wireless LAN antenna receives from the WiMAX radio wave, the wireless LAN antenna may be preferentially selected and the WIMAX antenna may be determined later.

  Furthermore, if mutual communication timing can be controlled, radio interference can be further reduced for both antennas.

  In the above-described embodiment, the relayed wireless network has been described as a wireless network operated at a close frequency. However, if all of the plurality of antennas to be used support multiband, Even an apparatus that relays wireless communication at different frequencies has the same effects as those of the second embodiment.

  Furthermore, in the above-described first and second embodiments, the wireless relay device has been described. However, even if the device does not need to perform relay processing, the wireless parameters of each wireless processing device can be monitored and set. The present invention can be similarly applied to a device in which a control device capable of determining an optimum antenna based on reception strength and transmission path loss between antennas is incorporated.

  Further, for example, in the above-described embodiment, the hardware configuration has been described. However, the present invention is not limited to this, and arbitrary processing is realized by causing a CPU (Central Processing Unit) to execute a computer program. It is also possible. In this case, the computer program can be stored using various types of non-transitory computer readable media and supplied to the computer. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (for example, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (for example, magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W and semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)) are included. The program may also be supplied to the computer by various types of transitory computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

Furthermore, part or all of the above-described embodiments can be described as in the following supplementary notes, but is not limited thereto.
(Appendix 1)
A first radio processing device that processes a radio signal of a first frequency and a second radio processing device that processes a radio signal of a second frequency different from the frequency of 1,
A plurality of antennas shared by the first and second wireless processing devices;
A switching array for connecting the plurality of antennas and the first and second wireless processing devices;
And a control unit that controls switching of the switching array.
(Appendix 2)
The control unit selects a first antenna that is an optimum antenna for the first radio processing device from the plurality of antennas, and performs second radio processing from the plurality of antennas excluding the first antenna. The wireless device according to appendix 1, wherein the switching array is controlled to select a second antenna that is an optimal antenna for the device.
(Appendix 3)
The required number of the first antennas is selected from the plurality of antennas according to the probability that the reception intensity of the first radio signal to be received by the first radio processing apparatus is the highest. The wireless device described.
(Appendix 4)
The wireless device according to supplementary note 3, wherein the first antenna is a device in which a reception number of the first wireless signal is measured by the plurality of antennas, and a required number is selected from those having the highest reception strength.
(Appendix 5)
The wireless device according to supplementary note 3, wherein the required number of the first antennas is selected based on the positional relationship between the positions of the plurality of antennas and the base station that transmits the first wireless signal.
(Appendix 6)
The wireless device according to any one of appendices 2 to 5, wherein a required number of the second antennas are selected from antennas having the largest transmission path loss with respect to the first antenna.
(Appendix 7)
The wireless device according to appendix 6, wherein the required number of the second antennas is selected based on a measurement result of a transmission path loss between the second antenna and the first antenna.
(Appendix 8)
The wireless device according to appendix 6, wherein the second antenna measures a transmission line loss with the first antenna, and a necessary number is selected based on the measurement result.
(Appendix 9)
The wireless device according to any one of appendices 1 to 8, wherein the plurality of antennas include antennas having directivity.
(Appendix 10)
The wireless device according to any one of appendices 1 to 9, wherein the plurality of antennas are arranged to be separated from each other.
(Appendix 11)
The wireless device according to any one of appendices 1 to 10, wherein the control unit adjusts the strength of wireless signals output from the plurality of antennas.
(Appendix 12)
The wireless device according to any one of supplementary notes 1 to 11, wherein the control unit monitors the strength of wireless signals received by the plurality of antennas, and controls connection and disconnection to a wireless network based on the monitoring result.
(Appendix 13)
The wireless device according to any one of appendices 1 to 10, wherein the control unit performs data transfer between the first wireless processing device and the second wireless processing device.
(Appendix 14)
The first wireless processing device is a wireless processing device that processes a wireless signal of WiMAX (Worldwide Interoperability for Microwave Access) standard,
14. The wireless device according to any one of appendices 1 to 13, wherein the second wireless processing device is a wireless processing device that processes a wireless signal having a frequency used in a wireless LAN.
(Appendix 15)
The first wireless processing device is a wireless processing device that processes a wireless signal having a frequency of 2.5 GHz band,
The wireless device according to supplementary note 14, wherein the second wireless processing device is a wireless processing device that processes a wireless signal having a frequency of 2.4 GHz band.
(Appendix 16)
The wireless device according to any one of appendices 1 to 15, wherein the first and / or the second wireless processing device is a wireless processing device that processes wireless signals from a plurality of antennas by a space division multiplexing technique.
(Appendix 17)
The wireless device according to any one of supplementary notes 1 to 16, comprising three or more wireless processing devices, wherein the wireless processing device shares the plurality of antennas in a time-sharing manner.
(Appendix 18)
The wireless device according to any one of appendices 1 to 17, wherein the first and second frequencies are adjacent frequencies.
(Appendix 19)
The wireless device according to any one of appendices 1 to 18, wherein the plurality of antennas include multiband antennas.
(Appendix 20)
Method of reducing radio interference of a radio apparatus equipped with a first radio processing apparatus that processes a radio signal of a first frequency and a second radio processing apparatus that processes a radio signal of a second frequency different from the first frequency Because
The first antenna, which is the optimum antenna for the first radio processing device, is selected from a plurality of antennas shared by the first and second radio processing devices, and is received by the first antenna. Processing a wireless signal with the first wireless processing device;
A second antenna that is an optimum antenna for the second radio processing device is selected from the plurality of antennas excluding the first antenna, and a radio signal received by the second antenna is selected from the second antenna. Wireless interference mitigation method for a wireless device processed by the wireless processing device.
(Appendix 21)
The radio apparatus according to appendix 20, wherein the required number of the first antennas is selected from the plurality of antennas according to the probability that the reception intensity of the first radio signal to be received by the first radio processing apparatus is the highest. Wireless interference mitigation method.
(Appendix 22)
The radio interference reduction method for a radio apparatus according to appendix 21, wherein the first antenna measures the reception intensity of the first radio signal by the plurality of antennas, and selects the required number from the highest reception intensity.
(Appendix 23)
The method of claim 21, wherein the required number of the first antennas is selected based on a positional relationship between the positions of the plurality of antennas and a base station that transmits the first radio wave.
(Appendix 24)
24. The method of reducing radio interference of a radio apparatus according to any one of appendices 20 to 23, wherein the required number of the second antennas is selected from the antennas having the largest transmission path loss with the first antenna. .
(Appendix 25)
25. The method of reducing radio interference of a radio apparatus according to any one of appendices 20 to 24, wherein the plurality of antennas include antennas having directivity.
(Appendix 26)
26. The radio interference reduction method for a radio apparatus according to any one of appendices 20 to 25, wherein the plurality of antennas are arranged so as to be separated from each other.
(Appendix 27)
The first wireless processing device is a wireless processing device that processes a wireless signal of WiMAX (Worldwide Interoperability for Microwave Access) standard,
27. The method of reducing wireless interference of a wireless device according to any one of appendices 20 to 26, wherein the second wireless processing device is a wireless processing device that processes a wireless signal having a frequency used in a wireless LAN.

DESCRIPTION OF SYMBOLS 1 Antenna 2 Antenna 3 Antenna 4 Antenna 5 Antenna 10 Antenna part 11 Relay processing apparatus 12 1st radio | wireless (A) processing apparatus 13 2nd radio | wireless (B) processing apparatus 14 Switching array 21 WiMAX processing apparatus 22 Wireless LAN processing apparatus 30 Antenna part 31 antenna 32 antenna 33 antenna 34 antenna 35 antenna 100 wireless relay device 200 wireless relay device 303 wireless relay device 311 wireless relay processing device 331 WiMAX processing device 332 wireless LAN processing device 322 WiMAX antenna 323 WiMAX antenna 321 wireless LAN antenna

Claims (10)

A first radio processing device that processes a radio signal of a first frequency and a second radio processing device that processes a radio signal of a second frequency different from the frequency of 1,
A plurality of antennas shared by the first and second wireless processing devices;
A switching array for connecting the plurality of antennas and the first and second wireless processing devices;
And a control unit that controls switching of the switching array.   The control unit selects a first antenna that is an optimum antenna for the first radio processing device from the plurality of antennas, and performs second radio processing from the plurality of antennas excluding the first antenna. The wireless device according to claim 1, wherein the switching array is controlled to select a second antenna that is an optimal antenna for the device.   The required number of the first antennas is selected from the plurality of antennas according to the probability that the reception intensity of the first radio signal to be received by the first radio processing apparatus is the highest. 2. The wireless device according to 2.   The radio apparatus according to claim 3, wherein the first antenna is one in which a necessary number is selected from those having the highest reception intensity by measuring the reception intensity of the first radio signal using the plurality of antennas.   The radio apparatus according to claim 3, wherein a required number of the first antennas are selected based on a positional relationship between the positions of the plurality of antennas and a base station that transmits the first radio signal.   6. The radio apparatus according to claim 2, wherein the required number of the second antennas is selected from the antennas having the largest transmission line loss with respect to the first antenna.   The radio apparatus according to claim 1, wherein the plurality of antennas include antennas having directivity. The first wireless processing device is a wireless processing device that processes a wireless signal of WiMAX (Worldwide Interoperability for Microwave Access) standard,
The wireless device according to any one of claims 1 to 7, wherein the second wireless processing device is a wireless processing device that processes a wireless signal having a frequency used in a wireless LAN.   The radio apparatus according to claim 1, wherein the first and second frequencies are adjacent frequencies. Method of reducing radio interference of a radio apparatus equipped with a first radio processing apparatus that processes a radio signal of a first frequency and a second radio processing apparatus that processes a radio signal of a second frequency different from the first frequency Because
The first antenna, which is the optimum antenna for the first radio processing device, is selected from a plurality of antennas shared by the first and second radio processing devices, and is received by the first antenna. Processing a wireless signal with the first wireless processing device;
A second antenna that is an optimum antenna for the second radio processing device is selected from the plurality of antennas excluding the first antenna, and a radio signal received by the second antenna is selected from the second antenna. Wireless interference mitigation method for a wireless device processed by the wireless processing device.

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