WO2015125399A1 - Wireless communication device, integrated circuit and wireless communication method - Google Patents

Abstract

A wireless communication device according to an embodiment has a first wireless communication unit, a second wireless communication unit and a control unit. The first wireless communication unit performs wireless communication using a first wireless communication method. The second wireless communication unit performs wireless communication using a second wireless communication method. When the second wireless communication unit is receiving, the control unit delays transmission of a signal using the first wireless communication unit.

Description

Wireless communication apparatus, integrated circuit, and wireless communication method

Embodiments described herein relate generally to a wireless communication device, an integrated circuit, and a wireless communication method.

The traffic of cellular systems is increasing due to the spread of smartphones. Therefore, off-loading of smartphone traffic that can be communicated with both a cellular system and a wireless local area network (LAN) to the wireless LAN has been actively performed.
However, when a unit that performs communication by wireless LAN and a unit that performs communication by a cellular system are provided in a terminal such as a smartphone, interference may occur between these units. For example, when LTE (Long Term Evolution), which is a kind of cellular system, uses a 2.5 GHz band and a wireless LAN uses a 2.4 GHz band, these frequency bands are different. However, interference may occur because both are mounted in a small casing.

JP 2010-56653 A JP 2010-199922 A JP 2013-70157 A

The problem to be solved by the present invention is to provide a wireless communication device, an integrated circuit, and a wireless communication method capable of suppressing interference generated in a terminal in which a plurality of wireless communication systems are mounted.

The wireless communication apparatus according to the embodiment includes a first wireless communication unit, a second wireless communication unit, and a control unit. The first wireless communication unit performs wireless communication using the first wireless communication method. The second wireless communication unit performs wireless communication using the second wireless communication method. When the second wireless communication unit is receiving a signal, the control unit delays transmission of the signal using the first wireless communication unit.

1 is a schematic block diagram illustrating a configuration of a wireless communication system 100 according to a first embodiment. FIG. 2 is a schematic block diagram showing a configuration of a base station device 40. 2 is a diagram illustrating an example of a hardware configuration of a base station 40. FIG. FIG. 3 is a diagram illustrating another example of the hardware configuration of the base station 40. FIG. 3 is a diagram illustrating another example of the hardware configuration of the base station 40. The flowchart which shows operation | movement of the LTE scheduler 402. FIG. 3 is a sequence diagram showing an operation of the wireless communication system 100. The sequence diagram which shows operation | movement of the radio | wireless communications system 100 of 2nd Embodiment. The flowchart which shows operation | movement of the LTE scheduler 402 of 3rd Embodiment. FIG. 9 is a sequence diagram showing an operation of the wireless communication system 101. FIG. 10 is a schematic block diagram illustrating a configuration related to transmission of a wireless LAN physical layer unit 202 and a wireless LAN antenna 203 according to a fourth embodiment. The schematic diagram which shows the example of the directivity at the time of transmitting CTS / Self. The table which shows the example of information of the multicast address which the wireless LAN scheduler 401 of 5th Embodiment has memorize | stored. The schematic block diagram which shows the structure of the base station apparatus 40a of the modification of each embodiment.

Hereinafter, a wireless communication device, an integrated circuit, and a wireless communication method according to embodiments will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic block diagram illustrating a configuration of a wireless communication system 100 according to the first embodiment. The wireless communication system 100 includes a PDN (Packet Data Network) gateway 20, a network 30, a base station device 40, a subscriber management device 50 (terminal management device), an LTE (Long Term Evolution) terminal device 60, and a plurality of devices. Terminal device 70 (partner device). The external network 10 is an external network such as the Internet. The PDN gateway 20 connects the external network 10 and the mobile communication network. For example, the PDN gateway 20 mediates communication between the LTE terminal device 60 and the terminal device 70 connected to the mobile communication network and the device connected to the external network 10. The network 30 connects the PDN gateway 20, the base station device 40, and the subscriber management device 50 so that they can communicate with each other, thereby constituting a mobile communication network. Note that a plurality of base station devices 40 may be connected to the network 30. Moreover, the terminal device 70 may be single. In addition, a serving gateway (not shown) connected to the base station device 40 may be provided in the network 30.

The base station device 40 is a wireless communication device having a base station function of LTE (first wireless communication system) and an access point function of wireless LAN (second wireless communication system). The base station function is, for example, a function that mediates communication between the terminal device 70 that is connected to the base station device 40 via LTE and communication with other devices or an external network such as the Internet. The access point function is, for example, a function that mediates communication between the terminal device 70 that is communicatively connected to the base station device 40 via a wireless LAN and communication with other devices or an external network such as the Internet. Examples of other devices include a server connected to the external network 10 or the network 30, and another terminal device 70 connected to another base station device 40. The LTE base station is also called evolvedeNode B (eNB).

The subscriber management device 50 manages information on subscribers who subscribe to a communication service using the base station device 40. Specifically, the subscriber management device 50 stores identification information in LTE of the terminal device 70 used by each subscriber.
The LTE terminal device 60 is a wireless communication device having an LTE terminal function. The LTE terminal is also called user equipment (UE). The terminal device 70 is, for example, a smartphone, and is a wireless communication device having an LTE terminal function and a wireless LAN terminal function. A wireless LAN terminal is also called a Station (STA).

For example, where both the wireless LAN and LTE can be used, the terminal device 70 uses wireless LAN communication for data communication and uses LTE communication for a telephone. In this way, the terminal device 70 communicates with the base station device 40 using both LTE and wireless LAN wireless communication schemes. In recent years, a SIM card (Subscriber Identity Module Module Card) in which identification information of the LTE terminal device 70 is recorded is used for wireless LAN authentication. When a SIM card is also used for wireless LAN authentication, the subscriber management device 50 can store the ID of the terminal device 70 as the LTE terminal and the ID of the wireless LAN terminal in association with each other.

The frequency used differs between LTE and wireless LAN. However, when both are mounted in a small housing such as a smartphone, wraparound within the housing or wraparound through the antenna occurs. For this reason, when the terminal device 70 performs transmission by wireless LAN, an out-of-band signal caused by this transmission causes interference with the reception of LTE in the terminal device 70 and inhibits the reception of LTE.

FIG. 2 is a schematic block diagram showing the configuration of the base station device 40. As shown in FIG. The base station device 40 includes a communication unit 41, a wireless LAN communication unit 42 (second wireless communication unit), an LTE communication unit 43 (first wireless communication unit), and a control unit 44. The wireless LAN communication unit 42 includes a wireless LAN-MAC (Media Access Control) layer unit 201, a wireless LAN physical layer unit 202, and a wireless LAN antenna 203. The LTE communication unit 43 includes an LTE-MAC layer unit 301, an LTE physical layer unit 302, and an LTE antenna 303. The control unit 44 includes a wireless LAN scheduler 401, an LTE scheduler 402, and an association acquisition unit 403.

The communication unit 41 is connected to the network 30 and mediates communication between other units connected to the network 30 and each unit of the base station device 40. The wireless LAN-MAC layer unit 201 performs control related to the MAC layer for transmission / reception via the wireless LAN. Specifically, the wireless LAN-MAC layer unit 201 generates a packet storing data or control information to be transmitted using the wireless LAN, restores a packet from a bit string demodulated by the wireless LAN physical layer unit 202, and the like. . The wireless LAN-MAC layer unit 201 receives data to be transmitted using the wireless LAN from another device via the communication unit 41. Also, the wireless LAN-MAC layer unit 201 transmits the restored packet to the packet destination device via the communication unit 41.

The wireless LAN physical layer unit 202 performs control related to a physical layer for transmission / reception via the wireless LAN. Specifically, the wireless LAN physical layer unit 202 modulates the packet created by the wireless LAN-MAC layer unit 201, transmits using the wireless LAN antenna 203, receives using the wireless LAN antenna 203, and demodulates the received signal. And so on. The wireless LAN antenna 203 is an antenna that transmits and receives signals via a wireless LAN. The wireless LAN antenna 203 may have a plurality of antennas.

The LTE-MAC layer unit 301 performs control related to a transmission / reception MAC layer using LTE. Specifically, the LTE-MAC layer unit 301 generates a packet storing data or control information to be transmitted using LTE, restores a packet from the bit string demodulated by the LTE physical layer unit 302, and the like. The LTE-MAC layer unit 301 receives data to be transmitted using LTE from another device via the communication unit 41. Also, the LTE-MAC layer unit 301 transmits the restored packet to the packet destination device via the communication unit 41.

The LTE physical layer unit 302 performs control related to a physical layer for transmission and reception by LTE. Specifically, the LTE physical layer unit 302 performs modulation of a packet created by the LTE-MAC layer unit 301, transmission using the LTE antenna 303, reception using the LTE antenna 303, demodulation of the received signal, and the like. The LTE antenna 303 is an antenna that transmits and receives signals by LTE. Note that the LTE antenna 303 may have a plurality of antennas.

The wireless LAN scheduler 401 determines the transmission timing of packets by the wireless LAN. In addition, when the wireless LAN-MAC layer unit 201 starts receiving a wireless LAN packet, the wireless LAN scheduler 401 generates packet information of the packet and notifies the LTE scheduler 402 of the packet information. The packet information is information including the packet length of the packet, the identification information of the transmission source, and the reception start time.

When the LTE scheduler 402 requests transmission of CTS (Clear To Send) / Self (also referred to as CTS-to-self) as a channel reservation signal, the wireless LAN scheduler 401 An instruction to transmit a packet representing CTS / Self is issued to the wireless LAN-MAC layer unit 201 in 201. Note that the request from the LTE scheduler 402 also includes a time length for reserving a channel, and the wireless LAN scheduler 401 sends the time length to the packet representing CTS / Self to the wireless LAN-MAC layer unit 201. Include information that indicates. CTS / Self is a channel reservation signal in the wireless LAN, and is a signal for prohibiting packet transmission to stations other than the station that transmitted the signal.

Note that CTS / Self is a form of CTS defined in IEEE 802.11. The CTS is a signal for prohibiting packet transmission to a device other than the address set in the destination address (MAC address) of the MAC header of the packet. CTS / Self prohibits the transmission of packets to devices other than the own device because the address of the own device is set as the destination address of the MAC header of the packet. Also, the value set in the duration field (duration field) of the MAC header of the CTS is called NAV (Network Allocation Vector) and is a time length for prohibiting packet transmission.

The LTE scheduler 402 determines data to be transmitted by LTE after a predetermined time has elapsed. An overview of processing by the LTE scheduler 402 will be described. In the present embodiment, the predetermined time is 2 subframes, but it may be after 1 subframe or after 3 subframes. The subframe is a time unit for scheduling in LTE. When requested to transmit data, the LTE scheduler 402 determines whether or not a wireless LAN packet is being received from the terminal device 70 that is the data transmission destination after two subframes. When making this determination, the LTE scheduler 402 refers to the packet information notified from the wireless LAN scheduler 401.

When it is determined that the data is being received, the LTE scheduler 402 postpones transmission of the target data. When it is determined that it is not being received, the LTE scheduler 402 requests the wireless LAN scheduler 401 to transmit CTS / Self. When the transmission of CTS / Self is completed, the LTE scheduler 402 allocates the transmission of the target data after two subframes.

The association acquisition unit 403 associates the identification information (IP address, MAC address, etc.) in each wireless LAN of the terminal device 70 with the identification information (IP address, MAC address, etc.) in LTE. Obtained from the subscriber management device 50. As described above, this association is performed by determining whether the LTE scheduler 402 is receiving a wireless LAN packet from the terminal device 70 that is the data transmission destination after two subframes of CTS / Self transmission. Used when. Specifically, since the identification information of the transmission source included in the packet information is identification information in the wireless LAN, the LTE scheduler 402 converts this identification information into identification information in LTE. Next, the LTE scheduler 402 determines whether or not the identification information in the converted LTE is the same as the identification information of the terminal device 70 that is a transmission destination of data by LTE. When the LTE scheduler 402 is the same, the LTE scheduler 402 determines that reception is in progress.

FIG. 3 is a diagram illustrating an example of a hardware configuration of the base station 40. The communication unit 41 includes a control circuit 410. The control unit 44 includes a control circuit 440 connected to the control circuit 410 of the communication unit 41. The control circuit 440 executes the functions of the control unit 44 (wireless LAN scheduler 401, LTE scheduler 402, and association acquisition unit 403).

The wireless LAN-MAC layer unit 201 includes a control circuit 420, a transmission processing circuit 421, and a reception processing circuit 423. The control circuit 420 is connected to the control circuit 410 of the communication unit 41 and the control circuit 440 of the control unit 44. The wireless LAN physical layer unit 202 includes a transmission signal processing circuit 427, a reception signal processing circuit 428, a DA conversion circuit 422, an AD conversion circuit 424, an RF transmission circuit 425, and an RF reception circuit 426. The wireless LAN-MAC layer unit 201 and the wireless LAN physical layer unit 202 are often realized as a one-chip IC.

The control circuit 420 performs processing such as a MAC layer. The control circuit 420 may include a clock generation unit. The transmission processing circuit 421 performs processing such as addition, encoding, and modulation (may include MIMO modulation) of a preamble pattern and a PHY header.

The wireless LAN physical layer unit 202 is, for example, an RF analog IC or a high frequency IC. The transmission signal processing circuit 427 in the wireless LAN physical layer unit 202 transmits the signal processed by the transmission processing circuit 421 to the DA conversion circuit 422. The DA conversion circuit 422 performs DA conversion on the signal received from the transmission signal processing circuit 427. The RF transmission circuit 425 wirelessly transmits the filtered signal using a transmission filter that extracts a signal in a desired band from the signal of the frame DA-converted by the DA conversion circuit 422 and a signal having a constant frequency supplied from the oscillation device. It includes a mixer that upconverts the frequency, a preamplifier (PA) that amplifies the signal after the upconversion, and the like.

The RF receiving circuit 426 in the wireless LAN physical layer unit 202 uses an LNA (low noise amplifier) that amplifies the signal received by the antenna 203, and a signal having a constant frequency supplied from the oscillation device, and outputs the amplified signal. It includes a mixer for down-converting to baseband, a reception filter for extracting a signal in a desired band from the down-converted signal, and the like. The AD conversion circuit 424 AD converts the signal from the RF reception circuit 426. The reception signal processing circuit 428 transmits the signal AD-converted by the AD conversion circuit 424 to the reception processing circuit 423.

The control circuit 420 may control the operation of the transmission filter of the RF transmission circuit 425 and the reception filter of the RF reception circuit 426. There may be another control unit that controls the RF transmission circuit 425 and the RF reception circuit 426, and the same control may be performed by the control circuit 420 issuing an instruction to the control unit.

The reception processing circuit 423 in the wireless LAN-MAC layer unit 201 performs signal demodulation processing (including MIMO demodulation), processing to remove a preamble pattern and a PHY header, and passes the processed frame to the control circuit 420.

Note that a switch for switching the wireless LAN antenna 203 to one of the RF transmission circuit 425 and the RF reception circuit 426 may be arranged in the wireless LAN physical layer unit 202. By controlling the switch, the wireless LAN antenna 203 may be connected to the RF transmission circuit 425 during transmission, and the wireless LAN antenna 203 may be connected to the RF reception circuit 426 during reception.

The LTE-MAC layer unit 301 is a one-chip IC including a control circuit 430, a transmission processing circuit 431, and a reception processing circuit 433. The control circuit 430 is connected to the control circuit 410 of the communication unit 41 and the control circuit 440 of the control unit 44. In addition, the LTE physical layer unit 302 includes a transmission signal processing circuit 437, a reception signal processing circuit 438, a DA conversion circuit 432, an AD conversion circuit 434, an RF transmission circuit 435, and an RF reception circuit 436. IC.

The control circuit 430 performs processing such as the MAC layer. The control circuit 430 may include a clock generation unit. The transmission processing circuit 431 performs processing such as addition, encoding, and modulation (may include MIMO modulation) of a preamble pattern and a PHY header.

The LTE physical layer unit 302 is, for example, an RF analog IC or a high frequency IC. The transmission signal processing circuit 437 in the LTE physical layer unit 302 transmits the signal processed by the transmission processing circuit 431 to the DA conversion circuit 432. The DA conversion circuit 432 DA converts the signal received from the transmission signal processing circuit 437. The RF transmission circuit 435 wirelessly transmits a signal after filtering using a transmission filter that extracts a signal in a desired band from the signal of the frame DA-converted by the DA conversion circuit 432 and a signal having a constant frequency supplied from the oscillation device. It includes a mixer that upconverts the frequency, a preamplifier (PA) that amplifies the signal after the upconversion, and the like.

The RF receiving circuit 436 in the LTE physical layer unit 302 uses an LNA (low noise amplifier) that amplifies a signal received by the antenna 303 and a signal having a constant frequency supplied from an oscillation device as a base. A mixer that down-converts the signal into a band, a reception filter that extracts a signal in a desired band from the down-converted signal, and the like are included. The AD conversion circuit 434 AD converts the signal from the RF reception circuit 436. The reception signal processing circuit 438 transmits the signal AD-converted by the AD conversion circuit 434 to the reception processing circuit 433.

The control circuit 430 may control the operation of the transmission filter of the RF transmission circuit 435 and the reception filter of the RF reception circuit 436. There may be another control unit that controls the RF transmission circuit 435 and the RF reception circuit 436, and the control circuit 430 may perform the same control by giving an instruction to the control unit.

The reception processing circuit 433 in the LTE-MAC layer unit 301 performs signal demodulation processing (including MIMO demodulation), processing to remove the preamble pattern and the PHY header, and passes the processed frame to the control circuit 430.

Note that a switch for switching the LTE antenna 303 to one of the RF transmission circuit 435 and the RF reception circuit 436 may be arranged in the LTE physical layer unit 302. By controlling the switch, the LTE antenna 303 may be connected to the RF transmission circuit 435 during transmission, and the LTE antenna 303 may be connected to the RF reception circuit 436 during reception.
Note that the LTE-MAC layer unit 301 and the LTE physical layer unit 302 may be realized as a one-chip IC.

4 and 5 are diagrams showing another example of the hardware configuration of the base station 40. FIG. As shown in FIG. 4, the communication unit 41, the control unit 44, the wireless LAN-MAC layer unit 201, the first wireless LAN physical layer unit 202-1, the LTE-MAC layer unit 301, and the first LTE physical unit A one-chip integrated circuit 500 including the layer portion 302-1 may be provided.

Note that, as shown in FIG. 4, the first wireless LAN physical layer unit 202-1 includes a transmission signal processing circuit 427, a reception signal processing circuit 428, a DA conversion circuit 422, and an AD conversion circuit 424. The second wireless LAN physical layer unit 202-1 includes an RF transmission circuit 425 and an RF reception circuit 426. The first LTE physical layer unit 302-1 includes a transmission signal processing circuit 437, a reception signal processing circuit 438, a DA conversion circuit 432, and an AD conversion circuit 434. The second LTE physical layer unit 302-1 includes an RF transmission circuit 435 and an RF reception circuit 436.

Also, as shown in FIG. 5, the communication unit 41, the control unit 44, the wireless LAN-MAC layer unit 201, the wireless LAN physical layer unit 202, the LTE-MAC layer unit 301, and the LTE physical layer unit 302. One chip integrated circuit 600 may be provided.

In the present embodiment, communication is performed using two antennas (the wireless LAN antenna 203 and the LTE antenna 303). However, a configuration in which one antenna is also used may be used. In this case, a switch for switching to one of the wireless LAN communication unit 42 and the LTE communication unit 43 may be arranged. By controlling the switch, the antenna may be connected to the wireless LAN physical layer unit 202 during wireless LAN communication, and the antenna may be connected to the LTE physical layer unit 302 during LTE communication.

FIG. 6 is a flowchart for explaining the operation of the LTE scheduler 402. The LTE scheduler 402 performs the process shown in FIG. 6 in order to schedule transmission after two subframes at the time of each subframe. First, the LTE scheduler 402 acquires the association between the identification information in the wireless LAN of each terminal device 70 and the identification information in LTE from the association acquisition unit 403 (Sa1). Next, the LTE scheduler 402 acquires a request for transmission to the terminal stored at the head of the queue from the LTE-MAC layer unit 301 (Sa2).

Next, when there is no transmission request in the queue and the LTE scheduler 402 cannot acquire (Sa3-No), the process proceeds to step Sa9. On the other hand, when the transmission request can be acquired from the queue (Sa3-Yes), the LTE scheduler 402 determines whether or not the terminal device of the transmission destination in the acquired request is compatible with the wireless LAN and LTE, that is, It is determined whether or not the terminal device 70 (Sa4). For example, when the association acquired in step Sa1 includes the identification information in the LTE of the terminal device of the transmission destination in the acquired request, the LTE scheduler 402 determines whether the terminal device of the transmission destination in the acquired request The terminal device 70 is determined. When the association acquired in step Sa1 does not include the LTE identification information of the transmission destination terminal device in the acquired request, the LTE scheduler 402 transmits the transmission destination terminal device in the acquired request. Is not the terminal device 70.

When it is determined that it is not the terminal device 70 (Sa4-No), the LTE scheduler 402 sets the transmission schedule of the request acquired in step Sa2 to be two subframes later, and instructs the LTE-MAC layer unit 301 (Sa8) The process proceeds to step Sa9.

On the other hand, when it is determined in step Sa4 that the terminal device 70 is used (Sa4-Yes), the LTE scheduler 402 transmits a packet transmitted by the wireless LAN from the terminal device 70 that is the transmission destination in the request acquired in step Sa2. It is determined whether or not reception is being performed after two subframes (Sa5).

For example, the LTE scheduler 402 performs the determination in step Sa5 as follows. First, the LTE scheduler 402 refers to the association acquired in step Sa1, and acquires identification information in the wireless LAN of the terminal device 70 that is the transmission destination in the request acquired in step Sa2. Then, the LTE scheduler 402 refers to packet information (details will be described later) indicating the wireless LAN reception schedule acquired from the wireless LAN scheduler 401, and performs the determination in step Sa5.

When it is determined in step Sa5 that the reception is not being performed (Sa5-No), the LTE scheduler 402 proceeds to step Sa6. On the other hand, when it is determined in step Sa5 that reception is in progress (Sa5-Yes), the process returns to step Sa2. As a result, transmission related to the acquired request is postponed.

In step Sa6, the LTE scheduler 402 requests the wireless LAN scheduler 401 to transmit CTS / Self, which is a wireless LAN channel reservation signal (Sa6). Note that the LTE scheduler 402 calculates the length of time required for transmission according to the request acquired in step Sa2. Furthermore, the LTE scheduler 402 calculates the time length from the transmission of the CTS / Self calculated by adding a predetermined time to this time length until the transmission according to the acquired request is terminated to the CTS / Included in the request for sending Self. Upon receiving the acquired request, the wireless LAN scheduler 401 sets the time length included in the request in the duration field of CTS / Self. Then, the wireless LAN scheduler 401 instructs the wireless LAN-MAC layer unit 201 to transmit CTS / Self.

When the completion of CTS / Self transmission is notified from the wireless LAN-MAC layer unit 201 via the wireless LAN scheduler 401, the LTE scheduler 402 sets the transmission schedule of the request acquired in step Sa2 to be two subframes later. The LTE-MAC layer unit 301 is instructed (Sa7). Next, the LTE scheduler 402 proceeds to step Sa9.
In step Sa9, the LTE scheduler 402 returns to the queue a request that has been acquired from the queue in step Sa2 but is being received in step Sa5 and did not transmit, that is, a request for which transmission was postponed. The process ends.

FIG. 7 is a sequence diagram for explaining the operation of the wireless communication system 100. In FIG. 7, B_LTE indicates transmission / reception using LTE in the base station apparatus 40. B_WLL indicates transmission / reception using the wireless LAN in the base station device 40. M_LTE indicates transmission / reception using LTE in the terminal device 70. M_WLL indicates transmission / reception in the terminal device 70 using the wireless LAN. Each of SF0 to SF9 is an LTE subframe. A subframe is a unit in the time direction when band allocation is performed.

R indicates the time when a transmission request is made. Tx ′ indicates a subframe in which transmission has been requested, but has been postponed and transmission has not been performed. Tx indicates data transmission, and Rx indicates data reception. CTS indicates transmission of CTS / Self, which is a channel reservation signal. NAV (Network Allocation Vector) is a period during which a channel is reserved by CTS / Self.

In the base station device 40, a request for transmitting data addressed to the terminal device 70 by LTE is generated in the subframe SF2. On the other hand, the terminal device 70 transmits data to the base station device 40 using the wireless LAN from near the subframe SF2 to near SF5. The packet of data transmitted by the terminal device 70 via the wireless LAN is demodulated by the wireless LAN physical layer unit 202 of the base station device 40. From this demodulation result, the wireless LAN-MAC layer unit 201 obtains the packet length and identification information of the transmission source of the packet, such as an association ID and a source address (MAC address). Packet information including the packet length, transmission source identification information, and reception start time is sent to the LTE scheduler 402 via the wireless LAN scheduler 401.

In the present embodiment, for convenience of explanation, the time at which the terminal device 70 transmits data using the wireless LAN is the time of the subframe SF2. However, in the wireless LAN, a packet may be transmitted at an arbitrary time. In general, the transmission time is not in units of subframes.

Packet information sent from the wireless LAN scheduler 401 to the LTE scheduler 402 is stored in a memory. The LTE scheduler 402 can obtain the time required for packet transmission by dividing the packet length included in the packet information by the bit rate. That is, in the case of FIG. 7, the memory stores packet information indicating that the terminal device 70 is transmitting a wireless LAN packet from the subframe SF2 to the subframe SF5. Note that the memory storing the packet information may be provided in either the wireless LAN scheduler 401 or the LTE scheduler 402, or may be in a block other than the wireless LAN scheduler 401 and the LTE scheduler 402.

The LTE scheduler 402 performs downlink signal scheduling from the base station apparatus 40 to the terminal apparatus 70 in units of subframes. For example, the LTE scheduler 402 schedules the subframe SF7 at the time of the subframe SF5 in consideration of the processing delay. In the subframe SF5, the LTE scheduler 402 accesses the memory and determines a terminal device 70 that can be scheduled in the subframe SF7.

For example, if a certain terminal device 70 does not transmit a wireless LAN packet at the time of the subframe SF4, the terminal device 70 can schedule to the subframe SF4. However, in the case of FIG. 7, packet information indicating that a certain terminal device 70 is transmitting a wireless LAN packet from the subframes SF2 to SF5 is stored in the memory. For this reason, the LTE scheduler 402 performs control to postpone transmission without allocating the terminal device 70 to the subframe SF4.

For example, it is assumed that there is a transmission request to a certain terminal device 70 and a transmission request to the LTE terminal device 60 at the time of the subframe SF2. The LTE scheduler 402 refers to the packet information stored in the memory. Then, since the packet information indicates that the terminal device 70 transmits the wireless LAN packet from the subframes SF2 to SF5, the LTE scheduler 402 displays the subframe SF4 that is two subframes after the subframe SF2. It is determined that the terminal device 70 cannot be scheduled. That is, LTE scheduler 402 selects only LTE terminal device 60 as a terminal device that can be scheduled in subframe SF4 that is two subframes after subframe SF2.

Thereby, at the time of the subframe SF4, the base station apparatus 40 postpones without transmitting a downlink signal to the terminal apparatus 70 in LTE. Therefore, it is possible to avoid interference between the wireless LAN packet transmitted by the terminal device 70 and the LTE downlink signal in the terminal device 70.

Next, the operation of the LTE scheduler 402 at the time of the subframe SF5 will be described. The LTE scheduler 402 performs downlink scheduling of the subframe SF7 at the time of the subframe SF5 that is two subframes before. The time of the subframe SF5 is the time when the terminal device 70 finishes transmitting the wireless LAN packet. Accordingly, the wireless LAN scheduler 401 instructs the wireless LAN-MAC layer unit 201 to transmit CTS / Self immediately after the wireless LAN packet. The wireless LAN-MAC layer unit 201 generates a CTS / Self packet, and the wireless LAN physical layer unit 202 modulates the packet and transmits the packet via the wireless LAN antenna 203.

In the duration field value described in this CTS / Self, the end time of the subframe SF7 is set from the time when the CTS / Self is transmitted. As a result, the NAV is the time until the end time of the subframe SF7, and during this time, the terminal device 70 does not transmit a packet by the wireless LAN. Therefore, it is possible to avoid interference between the LTE downlink signal transmitted from the base station apparatus 40 in the subframe SF7 and the wireless LAN signal transmitted from the terminal apparatus 70.

Note that the base station device 40 can set the PIFS shorter than the DIFS to the interval from when the reception of the packet by the wireless LAN is completed until the CTS / Self is transmitted. DIFS is Distributed (coordination function) interframe space, and PIFS is Point (coordination function) interframe space. These are defined in IEEE 802.11. By setting the interval to PIFS, the base station apparatus 40 can acquire the transmission right preferentially over other wireless LAN terminals, and more reliably extends the NAV until the end time of the subframe SF7, that is, the channel Can be booked.

Further, since the base station device 40 reserves the channel until the end time of the subframe SF7, the base station device 40 may transmit a wireless LAN packet to other terminal devices, or transmit any wireless LAN packet. You don't have to.

Returning to the description of the LTE scheduler 402, when the transmission of the CTS / Self is completed, the LTE scheduler 402 assigns data to the terminal device 70 to a subframe SF7 that is two subframes later. The LTE-MAC layer unit 301 generates a packet of data assigned to the subframe SF7 by the LTE scheduler 402. The LTE physical layer unit 302 modulates the packet generated by the LTE-MAC layer unit 301 and transmits the modulated packet through the LTE antenna 303. The LTE scheduler 402 also instructs the LTE-MAC layer unit 301 to generate a control signal for notifying the terminal device 70 that there is downlink data in the subframe SF7. This control signal is transmitted via the LTE-MAC layer unit 301, the LTE physical layer unit 302, and the LTE antenna 303.

The value set in the duration field of CTS / Self by wireless LAN scheduler 401 is the time length from the transmission of CTS / Self until the end of packet transmission by LTE. Other values may be used.

Thus, when the wireless LAN communication unit 42 is receiving a signal from the terminal device 70, the base station device 40 delays transmission to the terminal device 70 using the LTE communication unit 43. 44.
As a result, when the terminal device 70 is transmitting a wireless LAN signal, the base station device 40 transmits an LTE signal to the terminal device 70. In the terminal device 70, the wireless LAN transmission signal and the LTE signal are transmitted. Interference with the received signal can be suppressed.

Further, the control unit 44 transmits a channel reservation signal in the wireless LAN to the wireless LAN communication unit 42 before transmission to the terminal device 70 using the LTE communication unit 43, and is designated by the signal for a predetermined time. A signal for reserving a channel is transmitted by prohibiting transmission by a device other than the received device.
As a result, when the base station device 40 transmits an LTE signal to the terminal device 70, the terminal device 70 transmits a wireless LAN signal, and the terminal device 70 receives the wireless LAN transmission signal and the LTE signal. It can suppress that a signal interferes.

(Second Embodiment)
Next, a second embodiment will be described. The wireless communication system 100 according to the second embodiment has the same configuration as that of the first embodiment, but the operation of the base station device 40 is partially different. After transmitting the CTS / Self after transmitting the CTS / Self, the base station apparatus 40 according to the present embodiment transmits the LTE data to the terminal apparatus 70 earlier than the NAV. The point which cancels the channel reserved by CTS / Self when it complete | finishes or the wireless LAN function of the terminal device 70 is stopped differs from 1st Embodiment.

FIG. 8 is a sequence diagram for explaining the operation of the wireless communication system 100 according to the second embodiment. In the sequence diagram of FIG. 8, differences from FIG. 7 will be described. In FIG. 8, it is the same as that of FIG. 7 until the base station apparatus 40 transmits CTS / Self. However, in this CTS / Self duration field, a time length until the end of the subframe SF9 is set. However, in the case of FIG. 8, since a request for transmission of high-priority and small data such as an emergency earthquake warning is received, transmission is completed only in subframe SF7.

In this case, the LTE scheduler 402 instructs the wireless LAN scheduler 401 to transmit the CF-end defined by IEEE 802.11. CF (Contention-Free) -end is a signal for canceling the NAV that is stretched by CTS / Self until the end time of the subframe SF9. Due to this CF-end, the period of subframes SF8 and SF9 (Cncl in FIG. 8) is cancelled. As a result, the channel reserved by CTS / Self can be released and the wireless LAN channel can be used effectively.

Note that FIG. 8 shows a case where LTE transmission is completed earlier than NAV. However, when LTE transmission is not performed in NAV, or when the wireless LAN function of the terminal device 70 is stopped. Also, CF-end is transmitted. As an example in which transmission in LTE is not performed in NAV, when transmission is postponed, the LTE function of terminal device 70 is stopped.

Also in the second embodiment, similarly to the first embodiment, in the terminal device 70, it is possible to suppress the interference between the wireless LAN transmission signal and the LTE reception signal.
Furthermore, in the second embodiment, the control unit 44 causes the wireless LAN communication unit 42 to transmit a signal for canceling the channel reservation at any of the following three times. The first is when transmission to the terminal device 70 using the LTE communication unit 43 is completed within the NAV. The second is when NAV is not transmitted to the terminal device 70 using the LTE communication unit 43. The third is when the wireless LAN function of the terminal device 70 is stopped.
As a result, when there is no possibility of interference such as no transmission to the terminal device 70 by LTE or no possibility of transmission from the terminal device 70 by wireless LAN, a reservation is made in CTS / Self. Release the wireless LAN channel. Therefore, the wireless LAN channel can be used effectively.

(Third embodiment)
Next, a third embodiment will be described. The radio communication system 100 in the third embodiment has the same configuration as the radio communication system 100 in the first embodiment, but the operation of the base station device 40 is partially different. More specifically, the base station apparatus 40 performs transmission by LTE after channel reservation by CTS / Self to a plurality of terminal apparatuses 70 by frequency multiplexing. In LTE, since OFDMA (Orthogonal Frequency Division Multiple Access) is used, transmission to a plurality of terminal devices 70 can be frequency-multiplexed in the same subframe.

FIG. 9 is a flowchart for explaining the operation of the LTE scheduler 402 in the present embodiment. 9, parts corresponding to those in FIG. 6 are denoted by the same reference numerals, and description thereof is omitted. The flowchart of FIG. 9 differs from the flowchart of FIG. 9 in that step Sb7 is provided instead of step Sa7. In step Sb7, the LTE scheduler 402 schedules transmission of all the terminal devices 70 corresponding to the wireless LAN and LTE after two subframes. Note that the LTE scheduler 402 does not transmit all terminal devices 70 corresponding to the wireless LAN and LTE, but transmits the terminal device 70 that performs communication using the wireless LAN with the base station device 40 after two subframes. You may make it schedule.

FIG. 10 is a sequence diagram for explaining the operation of the wireless communication system 101. In the sequence diagram of FIG. 10, differences from FIG. 7 will be described. In FIG. 10, M1_LTE indicates transmission / reception using LTE in the first terminal apparatus 70. M1_WLL indicates transmission / reception using the wireless LAN in the first terminal device 70. M2_LTE indicates transmission / reception using LTE in the second terminal device 70. M2_WLL indicates transmission / reception using the wireless LAN in the second terminal device 70.

Assume that there is a request for transmission to two terminal devices 70 at the time of the subframe SF. In this case, for example, it is assumed that transmission to the first terminal device 70 is assigned to the subframe SF7 and transmission to the second terminal device 70 is assigned to the subframe SF8. Then, if the NAV is set up to the end time of the subframe SF8 using CTS / Self, the transmission of the wireless LAN packet is prohibited at this time. Since this prohibition is a prohibition on wireless LAN terminals other than these two terminal devices 70, wireless LAN communication is stopped during this period.

Therefore, in the present embodiment, as shown in FIG. 10, transmission to the first terminal device 70 and transmission to the second terminal device 70 are assigned to the same subframe SF7. For this reason, the NAV is applied until the end time of the subframe SF7, and can be shortened. As a result, the wireless LAN packet can be transmitted at the time of the subframe SF8, and the wireless LAN channel can be used effectively.

Also in the third embodiment, similarly to the first embodiment, the terminal device 70 can suppress interference between the wireless LAN transmission signal and the LTE reception signal.
Further, in the third embodiment, the control unit 44 frequency-multiplexes the transmission to the other terminal device 70 in the transmission to the terminal device 70 using the LTE communication unit 43.
As a result, it is possible to suppress the channel reservation time from being lengthened and to effectively use the wireless LAN channel.

(Fourth embodiment)
Next, a fourth embodiment will be described. The radio communication system 100 according to the fourth embodiment has the same configuration as that of FIG. 1, but the operation of the base station device 40 is different. Specifically, the base station device 40 is different in that the CTS / Self packet is transmitted in the direction of the terminal device 70 with directivity.

FIG. 11 is a schematic block diagram illustrating a configuration related to transmission of the wireless LAN physical layer unit 202 and the wireless LAN antenna 203 in the present embodiment. The wireless LAN physical layer unit 202 includes an encoding unit 221, a modulation unit 222, a copy unit 223, a weight multiplication unit 224, an IFFT unit 225, and a filter unit 226. The wireless LAN antenna 203 includes a first antenna 231 and a second antenna 232.

The encoding unit 221 performs error correction encoding on the bit string constituting the packet input from the wireless LAN-MAC layer unit 201. The error correction code to be used may be a low density parity check code, a Viterbi code, or the like. Modulation section 222 modulates the bit string that has been error correction encoded by encoding section 221 to generate a modulated symbol string. As a modulation method, any one of BPSK (Binary Phase Shift Keying), QPSK (Quaternary Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), and the like may be used.

The copy unit 223 copies the modulation symbol sequence generated by the modulation unit 222 and generates the same two modulation symbol sequences. The weight multiplication unit 224 regards the two modulation symbol sequences generated by the copy unit 223 as frequency domain signals, and multiplies each by a weight (weight). When the modulation symbol sequence is a modulation symbol sequence generated from a CTS / Self packet, the weight multiplying unit 224 sets these weights as weights that give directivity to the target terminal device 70. As a weight calculation method, for example, a method described in Patent Document 3 (Japanese Patent Laid-Open No. 2013-70157) can be applied.

The IFFT unit 225 performs inverse fast Fourier transform on each of the two frequency domain signals multiplied by the weights by the weight multiplication unit 224 to convert the signals into two time domain signals. The filter unit 226 performs filter processing for cutting high frequency components on the two time domain signals converted by the IFFT unit 225. The filter unit 226 transmits the filtered two time-domain signals via the first antenna 231 and the second antenna 232, respectively.

In the present embodiment, the wireless LAN antenna 203 has two antennas, but may be three or more. In this case, the copy unit 223 generates a number of modulation symbol sequences corresponding to the number of antennas. In addition, the weight multiplication unit 224, the IFFT unit 225, and the filter unit 226 also perform processing on each of the number of signals corresponding to the number of antennas.

FIG. 12 is a schematic diagram illustrating an example of directivity when transmitting CTS / Self. In FIG. 12, the BFA is a range in which the CTS / Self transmitted with directivity by the base station apparatus 40 can be received. The terminal device 70-1 is the terminal device 70 that is the destination of data transmission by LTE. The terminal device 70-2 is a terminal device 70 that is not a destination of data transmission by LTE.

Since the terminal device 70-1 which is the destination of data transmission by LTE is located within the range BFA, it receives CTS / Self. For this reason, the terminal device 70-1 does not transmit a packet by the wireless LAN during the NAV stretched by the CTS / Self. Therefore, it is possible to suppress interference between the LTE signal to the terminal device 70-1 and the wireless LAN signal transmitted by the terminal device 70-1.

On the other hand, since the terminal device 70-2 that is not the destination of the data transmission by LTE is located outside the range BFA, it does not receive the CTS / Self. For this reason, the terminal device 70-2 can transmit a packet by the wireless LAN even during the NAV stretched by the CTS / Self.

Also in the fourth embodiment, similarly to the first embodiment, the terminal device 70 can suppress interference between the wireless LAN transmission signal and the LTE reception signal.
Furthermore, in the fourth embodiment, the wireless LAN communication unit 42 transmits a channel reservation signal (CTS / Self) with directivity in the direction of the terminal device 70-1.
Thereby, the terminal devices 70 other than the terminal device 70-1 can transmit data by the wireless LAN even during the channel reserved time. That is, the wireless LAN channel can be used effectively.

(Fifth embodiment)
Next, a fifth embodiment will be described. The radio communication system 100 according to the fourth embodiment has the same configuration as that of FIG. 1, but the operation of the base station device 40 is different. Specifically, the base station device 40 in the first embodiment transmits the CTS in which the multicast address is set as the destination address (hereinafter referred to as CTS / multi) instead of the CTS / Self. And different.

Specifically, when the LTE scheduler 402 requests the wireless LAN scheduler 401 to make a wireless LAN channel reservation, the wireless LAN identification information (MAC address) of the terminal device 70 that is the destination of data transmission by LTE is used. ). The wireless LAN scheduler 401 selects one multicast address of a multicast group that does not include the notified MAC address from among previously stored multicast addresses. The wireless LAN scheduler 401 instructs the wireless LAN-MAC layer unit 201 to transmit CTS / multi with the selected multicast address set as the destination address. The subsequent steps are the same as in the first embodiment.

Note that the wireless LAN scheduler 401 may select one multicast address from the multicast addresses stored in advance, either randomly or in a predetermined order. It may be a method.

FIG. 13 is a table showing an example of multicast address information stored in the wireless LAN scheduler 401. The wireless LAN scheduler 401 stores each multicast address in association with the MAC address of the terminal device 70 belonging to the multicast group of the multicast address. For example, in FIG. 13, the multicast address “address M1” is associated with the MAC addresses “address A1, address A2, address A3” of the terminal devices 70 belonging to the multicast group of this multicast address.

For example, it is assumed that “address A5” is notified from the LTE scheduler 402 to the wireless LAN scheduler 401 as the MAC address of the terminal device 70. The wireless LAN scheduler 401 selects “address M1” or “address M2” which is a multicast address not associated with “address A5”.
The base station device 40 notifies each terminal device 70 of the multicast address of the multicast group to which the terminal device 70 belongs at the time of association or reassociation.

As described above, the CTS prohibits transmission of packets to devices other than the address set as the destination address. For example, consider a case where the multicast address “address M1” is set as the destination address of CTS / multi. At this time, among the devices that have received this CTS / multi, the device whose “address M1” is the multicast address of the multicast group to which the own device belongs can transmit packets via the wireless LAN. Therefore, the wireless LAN channel can be used effectively.

Also in the fifth embodiment, similarly to the first embodiment, in the terminal device 70, it is possible to suppress interference between the wireless LAN transmission signal and the LTE reception signal.
Furthermore, in the fifth embodiment, a multicast group is designated in the channel reservation signal, and the designated multicast group does not include the terminal device 70 that is the destination of transmission using the LTE communication unit 43.
Thereby, even if the channel reservation is made, the terminal device 70 belonging to the multicast group designated by the channel reservation signal can transmit the wireless LAN packet. Therefore, the wireless LAN channel can be used effectively.

In each of the above-described embodiments, LTE is exemplified as an example of a cellular system. However, a cellular system of the next generation or later such as LTE-A (Advanced) may be used, or a third generation such as W-CDMA. The previous cellular method may be used.

In each of the above-described embodiments, the base station apparatus 40 includes the control unit 44, but is divided into a wireless LAN control unit 44a that is a control unit related to the wireless LAN and an LTE control unit 44b that is a control unit related to LTE. May be. FIG. 14 is a schematic block diagram illustrating a configuration of a base station device 40a having a wireless LAN control unit 44a and an LTE control unit 44b. 14, parts corresponding to those in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted.

The base station device 40a includes a communication unit 41, a wireless LAN module 45, and an LTE module 46. The wireless LAN module 45 includes a wireless LAN communication unit 42 and a wireless LAN control unit 44a. The wireless LAN control unit 44 a includes a wireless LAN scheduler 401 and a wireless LAN external interface 404. The LTE module 46 includes an LTE communication unit 43 and an LTE control unit 44b. The LTE control unit 44b includes a correspondence acquisition unit 403, an LTE scheduler 402, and an LTE external interface 405. The wireless LAN scheduler 401 and the LTE scheduler 402 communicate with each other via the wireless LAN external interface 404 and the LTE external interface 405.

Furthermore, the base station device 40a may be divided into a wireless LAN base station device having the communication unit 41 and the wireless LAN module 45 and a wireless LAN base station device having the communication unit 41 and the LTE module 46. In this case, the wireless LAN external interface 404 and the LTE external interface 405 may communicate with each other via the respective communication units 41 instead of directly communicating with each other.

Further, in each of the above-described embodiments, the base station apparatus 40 transmits CTS / Self or CTS / multi to establish the NAV, but is not limited thereto. For example, the base station device 40 transmits an RTS (Request-To-Send) to the terminal device 70, and the terminal device 70 transmits CTS / Self or CTS / multi to the base station device 40, so that the NAV is transmitted. You may make it stretch.

In each embodiment described above, the LTE scheduler 402 may communicate with the wireless LAN-MAC layer unit 201 without using the wireless LAN scheduler 401.
In each of the above-described embodiments, the control unit 44 may be realized by dedicated hardware such as an LSI, or may be realized by a computer reading and executing a program.

According to at least one embodiment described above, when the wireless LAN communication unit 42 receives a signal from the terminal device 70, the transmission to the terminal device 70 using the LTE communication unit 43 is postponed. By having the control unit 44, it is possible to suppress interference between the wireless LAN transmission signal and the LTE reception signal in the terminal device 70.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

Claims (20)

1. A first wireless communication unit that performs wireless communication using the first wireless communication method;
   A second wireless communication unit that performs wireless communication using the second wireless communication method;
   And a control unit for delaying transmission of the signal using the first wireless communication unit when the second wireless communication unit is receiving a signal.
2. The control unit transmits a signal for channel reservation in the second wireless communication method to the second wireless communication unit before transmitting the signal using the first wireless communication unit, and the signal is transmitted for a predetermined time. The wireless communication device according to claim 1, wherein a signal for reserving a channel is transmitted by prohibiting transmission by a device other than the device specified by the control unit.
3. The wireless communication device according to claim 2, wherein the predetermined time is equal to or longer than a time required for signal transmission using the first wireless communication unit.
4. The control unit does not transmit a signal using the first wireless communication unit at the predetermined time when transmission of the signal using the first wireless communication unit is completed within the predetermined time. Or when the communication function of the second wireless communication method of the counterpart device communicating with the wireless communication device is stopped, the first wireless communication unit is caused to transmit a signal for canceling the channel reservation. Item 4. The wireless communication device according to Item 2 or 3.
5. The said control part frequency-multiplexes the transmission to the other party apparatus which is communicating using the said 2nd wireless communication part for the transmission to the other party apparatus using the said 1st wireless communication part. 5. The wireless communication device according to any one of 4 to 4.
6. The wireless communication according to any one of claims 2 to 5, wherein the first wireless communication unit transmits the channel reservation signal with directivity in a direction of a counterpart device that communicates with the wireless communication device. apparatus.
7. The channel reservation signal designates a device by a multicast group,
   The wireless communication device according to any one of claims 2 to 6, wherein the multicast group specified by the channel reservation signal does not include a partner device that communicates with the wireless communication device.
8. The wireless communication device according to any one of claims 1 to 7, wherein the first wireless communication method is a communication method based on LTE (Long Term Evolution).
9. The wireless communication apparatus according to any one of claims 1 to 7, wherein the second wireless communication system is a communication system using a wireless LAN (Local Area Network).
10. The first wireless communication unit includes an antenna used for wireless communication using the first wireless communication method,
    The wireless communication apparatus according to claim 1, wherein the second wireless communication unit includes an antenna used for wireless communication using the second wireless communication method.
11. An integrated circuit including the wireless communication device according to any one of claims 1 to 9.
12. A terminal device that performs wireless communication using the first wireless communication method and wireless communication using the second wireless communication method, wireless communication using the first wireless communication method, and wireless using the second wireless communication method A wireless communication method in a wireless communication system having a base station device that performs communication with the terminal device,
    A wireless communication method comprising: delaying transmission to the terminal device using the first wireless communication method when the base station device is receiving a signal of the second wireless communication method from the terminal device. .
13. In the step, when the base station device postpones transmission to the terminal device, the terminal management device stores the identification information in the first wireless communication scheme of the terminal device, and the first information of the terminal device. Whether or not the transmission source of the signal of the second wireless communication method and the transmission destination of the transmission using the first wireless communication method are the same by using the association with the identification information in the two wireless communication method judge,
    The wireless communication method according to claim 12.
14. A wireless communication method in a wireless communication device having a first wireless communication unit that performs wireless communication using a first wireless communication method and a second wireless communication unit that performs wireless communication using a second wireless communication method,
    A wireless communication method comprising: delaying transmission of a signal using the first wireless communication unit when the second wireless communication unit is receiving a signal.
15. A first wireless communication unit that performs wireless communication using the first wireless communication method;
    A second wireless communication unit that performs wireless communication using the second wireless communication method;
    Prior to transmission of a signal using the first wireless communication unit, a signal for channel reservation in the second wireless communication method is transmitted to the second wireless communication unit other than a device designated by the signal for a predetermined time. And a control unit that transmits a signal prohibiting transmission by the device.
16. The wireless communication apparatus according to claim 15, wherein the first wireless communication system is a communication system based on LTE (Long Term Evolution).
17. The wireless communication apparatus according to claim 15, wherein the second wireless communication system is a communication system using a wireless LAN (Local Area Network).
18. An integrated circuit including a wireless communication device according to any one of claims 15 to 17.
19. A terminal device that performs wireless communication using the first wireless communication method and wireless communication using the second wireless communication method, wireless communication using the first wireless communication method, and wireless using the second wireless communication method A wireless communication method in a wireless communication system having a base station device that performs communication with the terminal device,
    The base station apparatus is a channel reservation signal in the second radio communication system before transmission to the terminal apparatus using the first radio communication system, and is designated by the signal for a predetermined time A wireless communication method comprising a step of transmitting a signal prohibiting transmission by a device other than the above.
20. A wireless communication method in a wireless communication device having a first wireless communication unit that performs wireless communication using a first wireless communication method and a second wireless communication unit that performs wireless communication using a second wireless communication method,
    Before transmission of a signal using the first wireless communication unit, the second wireless communication unit is a channel reservation signal in the second wireless communication method, and is a device other than the device specified by the signal for a predetermined time. A wireless communication method comprising a step of prohibiting transmission by the apparatus.

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