JP5359755B2 - Wireless communication system, terminal device, wireless LAN access point, and wireless communication method - Google Patents

Description

  The present invention relates to a technique for performing wireless communication in a duplex communication mode of a wireless LAN / Bluetooth communication system, and in particular, a wireless communication system that performs wireless communication in a duplex communication mode while controlling data transmission timing of a wireless LAN access point, The present invention relates to a terminal device, a wireless LAN access point, and a wireless communication method configured in the wireless communication system.

  In recent years, an apparatus that performs communication connection between devices by wireless communication has been increasing mainly in the PC (Personal Computer) market. Among such communication connection methods between devices, in the communication connection of a notebook PC, the frequency of using the communication connection by the wireless LAN is higher than the frequency of using the communication connection by the wired LAN. . On the other hand, from the viewpoint of simplicity of pairing between devices, Bluetooth (Bluetooth), which is a short-range wireless communication system of about several meters, has rapidly increased its share. Accordingly, many communication devices (terminal devices) that implement both wireless LAN and Bluetooth wireless communication systems (hereinafter referred to as wireless LAN / Bluetooth communication systems) are on the market.

  Such a wireless LAN / Bluetooth communication method is easy to operate and convenient, but uses the same 2.4 GHz band radio wave for both wireless LAN and Bluetooth communication methods, so wireless signals interfere with each other and communicate. It has been found that performance is degraded. Therefore, in order to avoid such an interference phenomenon, Bluetooth alone has a function called AFH (Auto Frequency Hopping) that performs transmission while avoiding the frequency band used by the wireless LAN. However, if the distance between the terminal device using the wireless LAN and the terminal device using Bluetooth is close, it will not be possible to properly determine the frequency band used for the wireless LAN, so communication is normal. There was a problem that the operation could not be performed.

  In order to avoid such a problem, a method of performing transmission control of a wireless LAN / Bluetooth communication method called Coexistence in a time division manner is known. Although such transmission control by time division causes degradation of communication performance due to time division, the influence of radio wave interference can be avoided in transmission from a terminal device equipped with a wireless LAN / Bluetooth communication system.

  The present invention also relates to a wireless communication system that performs wireless data communication in a duplex communication mode between IEEE802.11-operated wireless LAN and Bluetooth, which is a license-free wireless LAN standard established by the Institute of Electrical Electronics Engineers Inc (IEEE). A technique is also disclosed (see, for example, Patent Document 1). According to this technology, the access point (interface device) is configured to be able to process both Bluetooth and IEEE802.11-operated wireless LAN signals, and the terminal device that is transmitting signals transmits and receives via Bluetooth. You have reserved a time zone. As a result, the access point can transmit data to the terminal device while avoiding the signal transmission / reception time zone of the corresponding terminal device via Bluetooth, and therefore, collision of signals between the terminal device and the access point is avoided. In addition, radio wave interference between the wireless LAN and Bluetooth can be avoided.

JP 2002-319948 A

  However, in the conventional wireless LAN / Bluetooth communication system in which transmission control is performed by the conventional time division, radio interference between terminal devices can be avoided, but since the peripheral device does not know the operation state of the terminal device side, Transmission is performed at the timing of peripheral devices. Therefore, there is a possibility that transmission from the opposite terminal device and the transmission of the terminal device collide with each other, and as a result, it is difficult to obtain sufficient communication performance.

  The technique disclosed in Patent Document 1 is a technique for a terminal device that performs wireless data communication in the duplex communication mode by the IEEE 802.11 wireless LAN / Bluetooth communication system to avoid signal collision and radio wave interference. However, transmission control is not performed in a time division manner. In other words, the access point reserves the terminal device's Bluetooth signal transmission / reception time zone in advance and avoids the reserved Bluetooth signal transmission / reception time zone to transmit data from the access point to the terminal device. It avoids signal collision and interference. Therefore, since the terminal device must reserve the Bluetooth activity time zone at the access point each time, the usability at the time of transmission / reception of wireless data in the dual communication mode by the terminal device becomes extremely poor.

  The present invention has been made in view of such a problem, and by controlling the transmission timing of both terminal devices facing each other by a wireless LAN access point, it is possible to improve transfer efficiency in time division and between terminal devices. An object of the present invention is to provide a wireless communication system, a terminal device, a wireless LAN access point, and a wireless communication method that can avoid the collision of signals.

In order to achieve the above object, a wireless communication system according to the present invention includes a terminal device that is equipped with a wireless LAN / Bluetooth communication system duplex communication mode and performs wireless communication by time-sharing data A, and a terminal device. A wireless LAN access point that controls data transmission timing based on the received data A, and transmits data B during a communicable time avoiding either the Bluetooth communication period or the wireless LAN communication period of the terminal device ; The data A is three pieces of time information including a wireless LAN occupation time, a Bluetooth occupation time, and a time elapsed from the start of the wireless LAN occupation time of the terminal device, and the wireless LAN access point has the three times The communicable time is calculated based on information.

A wireless LAN access point according to the present invention is a wireless LAN access point configured in a wireless communication system that performs wireless communication control in a duplex communication mode by a wireless LAN / Bluetooth communication system in a time division manner. The data transmission timing is controlled based on the data A received from the terminal device equipped with the Bluetooth communication method, and the data B is transmitted during the communicable time avoiding either the Bluetooth communication period or the wireless LAN communication period of the terminal device. The data A is three pieces of time information including a wireless LAN occupation time, a Bluetooth occupation time, and a time elapsed from the start of the wireless LAN occupation time of the terminal device, and the data A is based on the three pieces of time information. The communicable time is calculated.

A terminal device according to the present invention is a terminal device that is equipped with a wireless LAN / Bluetooth communication mode duplex communication mode and performs wireless communication by time-sharing data A. The data B is received from the wireless LAN access point during the communicable time avoiding either the Bluetooth communication period or the wireless LAN communication period according to the data transmission timing controlled based on the data A, the wireless LAN occupation time, Three pieces of time information including a Bluetooth occupation time and a time elapsed from the start of the wireless LAN occupation time are transmitted to the wireless LAN access point.

In addition, a wireless communication method according to the present invention is a wireless communication method that performs wireless communication control in a duplex communication mode by a wireless LAN / Bluetooth communication method in a time-sharing manner. A first step in which a duplex communication mode is installed, and data A is wirelessly shared by time division; and a second step in which a wireless LAN access point controls data transmission timing based on data A received from a terminal device. And a third step in which the LAN access point transmits data B to the terminal device during a communicable time avoiding either the Bluetooth communication period or the wireless LAN communication period of the terminal device based on the data transmission timing; only contains the data a, the terminal equipment, the wireless LAN occupancy time, Bluetooth occupancy time, and third time that has elapsed from the start the wireless LAN occupancy time A time information, the wireless LAN access point, in the second step, and calculates the communicable time based on the three time information.

  According to the wireless communication system of the present invention, when a terminal device is equipped with a wireless LAN / Bluetooth communication system and performs simultaneous communication by time division, the wireless LAN access point controls transmission timing to the terminal device. The collision of radio signals during Bluetooth transmission on the terminal device side can be avoided. That is, since the wireless LAN access point controls the transmission timing to the terminal device based on time information such as the wireless LAN occupation time and the Bluetooth occupation time as a parameter relating to time division, a transmission signal is transmitted between a plurality of terminal devices. There is no risk of collision. As a result, deterioration of transfer efficiency due to simple radio signal collision can be avoided, and Fall Down (reduction in data communication rate) due to retransmission can be prevented. Accordingly, it is possible to suppress deterioration of transfer efficiency due to Fall Down, and it is possible to increase the usable frequency band of the terminal device.

It is a block diagram of the radio | wireless communications system of this invention. It is a flowchart which shows the flow of operation | movement of the terminal device 10 shown in FIG. 2 is a flowchart showing a flow of operation of a wireless LAN access point (AP) 20 shown in FIG. It is a conceptual diagram which shows the operation | movement by the side of AP20 when AP20 shown in FIG. 1 performs transmission timing control. It is a conceptual diagram which shows the effect in case AP20 shown in FIG. 1 converts Multicast Packet into Unicast Packet, and transmits. It is a conceptual diagram which shows the effect in case AP20 shown in FIG. 1 transmits data only in the WLAN communication possible time slot | zone.

  The wireless communication system of the present invention is characterized in that in a wireless LAN / Bluetooth communication system, transmission control of data transmitted from a wireless LAN access point to a terminal device is performed. As a result, in the competition of terminal devices that can simultaneously use wireless LAN / Bluetooth using the same 2.45 GHz band, efficient data communication can be performed while avoiding signal collision and interference.

  That is, the wireless communication system of the present invention includes a terminal device and a wireless LAN access point that can communicate with both wireless LAN / Bluetooth communication systems, and parameters related to time division from the terminal device to the wireless LAN access point (that is, , Parameters such as wireless LAN occupation time and Bluetooth occupation time). The wireless LAN access point transmits data to the terminal device during the communicable time period calculated based on the received parameters. In other words, the wireless LAN access point transmits / receives data to / from the terminal device only during a time zone in which communication with the terminal device is possible. Thereby, data collision and interference between terminal devices can be prevented. Hereinafter, several embodiments of the present invention will be described in detail with reference to the drawings. In all the drawings for explaining the embodiments, the same elements are denoted by the same reference symbols in principle, and the repeated explanation thereof is omitted.

<< First Embodiment >>
First, the configuration of the wireless communication system according to the present invention will be described. FIG. 1 is a configuration diagram of a wireless communication system according to the present invention comprising a terminal device and a wireless LAN access point. As shown in FIG. 1, the wireless communication system 1 is configured by wirelessly connecting a terminal device 10 and a wireless LAN access point (hereinafter referred to as AP: Access Point) 20.

  In FIG. 1, a terminal device 10 includes a CPU 11 that controls each unit in the terminal device 10, a RAM (Random Access Memory) 12 that is a work area of the terminal device 10, and a flash ROM (Read Only) that stores a control program for the terminal device 10. Memory) 13, a display unit 14 for displaying various information of the terminal device 10, a key input unit 15 serving as a human interface for inputting data, and a wireless unit 16. The wireless unit 16 includes a wireless LAN unit 16a and a Bluetooth unit 16b.

  In addition, the AP 20 includes a CPU 21 that controls each unit in the AP 20, a RAM 22 that serves as a work area for the AP 20, a flash ROM 23 that stores a control program for the AP 20, a display unit 24 that displays various types of information of the AP 20, and a user input. A key input unit 25 serving as a man interface and a wireless LAN unit 26 that performs wireless LAN communication on the AP 20 side are provided.

  That is, the CPU 11, RAM 12, flash ROM 13, display unit 14, and key input unit 15 on the terminal device 10 side, and the CPU 21, RAM 22, flash ROM 23, display unit 24, and key input unit 25 on the AP 20 side have the same functions. Consists of elements that have. Therefore, only the wireless unit 16 on the terminal device 10 side and the wireless LAN unit 26 on the AP 20 side are different. Of the above-described elements, the display units 14 and 24 and the key input units 15 and 25 are not essential elements, but are desirably mounted to provide a better user interface.

  Next, the operation of the wireless communication system 1 shown in FIG. 1 will be described. The wireless communication system 1 of the present invention is realized by (1) control of transmission timing on the AP 20 side and (2) optimization of transmission packets on the AP 20 side.

First, the AP side transmission timing control (1) will be described in detail with reference to flowcharts. First, the operation on the terminal device 10 side will be described.
FIG. 2 is a flowchart showing an operation flow of the terminal device 10 shown in FIG.
In FIG. 2, when the terminal device 10 is activated, the terminal device 10 checks whether or not the wireless LAN can be activated (step S1). If the wireless LAN is in a state where it can be activated (Yes in step S1), the terminal device 10 confirms the Bluetooth activation state (step S2) and determines whether Bluetooth is activated. (Step S3).

Here, when Bluetooth is activated (Yes in step S3), the terminal device 10 sets parameters related to Coexistence for the Bluetooth unit 16a and the wireless LAN unit 16b in its own wireless unit 16, Time-division control is started (step S4). The parameter setting is
・ Record wireless LAN occupation time / Bluetooth occupation time in memory. For example, if wireless LAN communication and Bluetooth communication are performed every second, information corresponding to 1 second is recorded for both the wireless LAN occupation time and the Bluetooth occupation time. Coexistence is a method that enables wireless LAN / Bluetooth to communicate simultaneously using time division in a terminal device that implements both wireless LAN / Bluetooth. This method connects the wireless LAN module and the Bluetooth module by wire and notifies each other's communication status to perform time-sharing control, and there is already a terminal device that implements this function itself. doing.

  Next, the wireless LAN is activated to execute scan processing, and the Probe Request transmitted from the terminal device 10 at this time is rewritten. That is, the information element is added to the Vendor Specific of the Probe Request, the Probe Request is rewritten (Step S5), and the rewritten Probe Request is transmitted (Step S6). Here, the scanning process is a process in which the station side of the wireless LAN searches for a wireless LAN access point (AP). If Bluetooth is not activated in step S3 (No in step S3), the probe request transmitted from the terminal device 10 is not rewritten, and the probe request is transmitted as it is (step S6).

Here, the information element added to the Vendor Specific of Probe Request in step S5 has the following contents. That is,
・ Time-sharing control flag (8 bits)
・ Wireless LAN occupation time [msec / 4] (16 bits)
・ Bluetooth occupation time [msec / 4] (16 bits)
-Time elapsed since the start of wireless LAN occupation time [msec / 4] (16 bits)

  The “time division control flag” is a flag indicating whether or not time division control by Coexistence is being performed. Considering the expandability of Vendor Specific, 8 bits are prepared, and a time division control flag is assigned to 1 bit, but it is possible to determine whether time division is performed by the presence or absence of the remaining three parameters. If there is no information element to be added to Vendor Specific of Probe Request, this parameter may be omitted.

  “Wireless LAN occupation time” and “Bluetooth occupation time” are parameters indicating the division ratio of time division in Coexistence. Furthermore, “the time elapsed since the start of the wireless LAN occupation time” indicates the time elapsed from the timing when the communicable time zone is switched from Bluetooth to the wireless LAN in the time division control in the terminal device 10 until the packet transmission.

  Further, the minimum value of the Bluetooth clock value is 312.5 μsec, but it is assumed that Coexistence is used and the clock value is the smallest when the SCO Link HV3 Packet is used. At this time, since the time occupied by Bluetooth is 1.25 msec, it is desirable that the Bluetooth clock value can be set in units of 0.25 msec. When Bluetooth is not activated, such processing is not performed, and a normal probe request is transmitted and scanning processing is performed as shown in the flow from step S3 to step S6 in FIG.

  Next, the operation on the AP 20 side will be described. FIG. 3 is a flowchart showing a flow of operations of the AP 20 shown in FIG. In FIG. 3, when the received Probe Request includes information to be responded, the AP 20 checks the time division control flag included in the information element added to the Vendor Specific of the Probe Request (step S11).

  Then, it is confirmed whether or not the time division control flag is valid (step S12). If the time division control flag is valid (Yes in step S12), from other parameters of the acquired information element, A time zone in which the terminal device 10 that has transmitted the probe request can communicate with the wireless LAN is calculated and stored (step S13).

  Next, the AP 20 determines whether there is a time zone in which the terminal device 10 can perform wireless LAN communication (step S14), and if there is a time zone in which the terminal device 10 can perform wireless LAN communication (Yes in step S14). The AP 20 responds Probe Response to the terminal device 10 in the calculated time zone in which the terminal device 10 can perform wireless LAN communication (step S15). That is, by transmitting a response from the AP 20 to the terminal device 10 in the calculated terminal side wireless LAN communication available time zone, the terminal device 10 side transmits a Probe Response in the Bluetooth communication available time zone, and the packet is transmitted. It is possible to prevent problems such as a packet that cannot be received on the mobile device side due to a collision and interference with communication on the Bluetooth side.

  Here, the state in which the collision of the packet can be avoided or the interference to the communication on the Bluetooth side can be prevented by controlling the transmission timing of the data transmitted from the AP 20 side to the terminal device 10 side. This will be described in more detail with reference to the drawings. FIG. 4 is a conceptual diagram showing the operation on the AP 20 side when the AP 20 shown in FIG. 1 performs transmission timing control, and the horizontal axis shows the flow of time in both the upper and lower figures.

  As shown in the upper diagram of FIG. 4, the time t1 is the Bluetooth occupation time and the wireless LAN occupation time and the switching timing, and the Bluetooth occupation time T1 is set before this time, and the wireless LAN occupation time T2 after the time t1. Is set. Also, from time t1 to time t2, it is assumed that the time required for the terminal device 10 to transmit the probe request is the time T3 that has elapsed since the start of the wireless LAN occupation time. Therefore, the AP 20 calculates and detects a time obtained by subtracting t1, which is the start timing of the wireless LAN occupation time, from the probe request reception time at the AP 20 by the time indicated by T3. Thereafter, the wireless LAN occupation time T2 and the Bluetooth occupation time T1 in the terminal device 10 are automatically determined by repeatedly counting the wireless LAN occupation time and the Bluetooth occupation time with reference to t1.

  Therefore, as shown in the lower diagram of FIG. 4, based on the time period in which data can be transmitted to the terminal device 10 automatically identified by the AP 20, the AP 20 transmits the Bluetooth communication period from the terminal device 20 corresponding to the times T11, T13, and T15. In the following (BT communication period), data transmission to the terminal device 10 is prohibited, and data transmission to the terminal device 10 is performed only during the communication possible times of times T12 and T14. In this way, by performing transmission timing control from the AP 20 to the terminal device 10, the terminal device 10 side transmits a probe response in a Bluetooth communicable time zone (that is, Bluetooth occupation times T11, T13, T15) It is possible to avoid situations such as collision of packets and interference with Bluetooth communication.

Next, (2) optimization of transmission packets on the AP 20 side will be described.
By controlling the transmission timing on the AP 20 side in (1) described above, it is possible to avoid packet collision between the Bluetooth transmission on the terminal device 10 side and the data transmission on the AP 20 side with high probability. Can't do good communication. In other words, depending on how the transmission timing is set on the AP 20 side, there is a possibility that the packet is transmitted in the Bluetooth communication available time zone on the terminal device 10 side.

In order to avoid such problems, the following two processes are performed. That is,
1. When a Multicast Packet (a packet transmitted simultaneously to a plurality of terminal devices) is transmitted to the terminal device 10, it is handled as a Unicast Packet (a packet transmitted only to one specific terminal device).
2. Even during the operation of Power Save OFF / Power Save ON (U-APSD), transmission is performed only in a time zone in which WLAN (Wireless LAN) can be communicated.

  Normally, when the AP 20 receives a Multicast Packet from the network side, it transmits to the terminal device 10 at the timing of the next DTIM (Delivery Traffic Indication Message), but the data is transmitted from the AP 20 by this method. Then, there is a high possibility that the terminal device 10 cannot receive the data.

  Note that DTIM is data presence notification information indicating that there is data to be transmitted from the access point to the terminal device in the power saving mode. If the wireless LAN module of the terminal device can be activated in the DTIM cycle, it can be received even by Multicast Packet. However, if the wireless LAN module cannot be activated in the DTIM cycle due to time division, there is a possibility that data will be lost as described above. is there.

  Therefore, if the terminal device that has notified that the terminal devices are in a competitive state belongs, send the Multicast Packet to the terminal device to which it belongs, and send it to the wireless LAN side All packets are converted to Unicast Packets before being sent to each terminal device. By using this method, the traffic in the wireless space increases, but the terminal device 10 can receive data at an arbitrary timing, so that the possibility of data loss due to packet collision can be reduced.

  Further, by using this method, it is possible to expect reduction of retransmission processing and prevention of a decrease in data communication rate (that is, Fall Down), so it can be estimated that communication traffic does not increase significantly. However, if all Multicast Packets are converted to Unicast Packets and then transmitted, the amount of data when streaming distribution, etc. that simultaneously plays while downloading the data becomes enormous. About the packet which has, it transmits as Multicast Packet.

  The optimization of the transmission packet on the AP 20 side in (2) will be described in more detail with reference to the conceptual diagram. FIG. 5 is a conceptual diagram showing the effect when the AP 20 shown in FIG. 1 converts a Multicast Packet into a Unicast Packet and transmits it. In both the upper and lower diagrams, the horizontal axis indicates the flow of time. As shown in the upper diagram of FIG. 5, when a Multicast Packet is transmitted from the AP 20 to the terminal device 10 at the timing of time t21 outside the BT communication period (Bluetooth communication period) of the terminal device 10, at the timing of time t22. Since the data (DTIM) is transmitted from the AP 20 to the terminal device 10, the terminal device 10 can receive the DTIM.

  However, when a Multicast Packet is transmitted from the AP 20 to the terminal device 10 at the timing of time t23, since DTIM is transmitted from the AP 20 to the terminal device 10 at the timing of time t24, it overlaps with the BT communication period of the terminal device 10. Therefore, the terminal device 10 cannot receive the DTIM.

  Therefore, when the AP 20 converts the Multicast Packet into the Unicast Packet and transmits it to the terminal device 10, the terminal device 10 can reliably receive the DTIM as shown in the lower diagram of FIG. That is, both when the Multicast Packet is transmitted from the AP 20 at the time t31 and when the Multicast Packet is transmitted from the AP 20 at the time t34, the Multicast Packet is converted into a Unicast Packet and transmitted to the terminal device 10. Is done.

  Thereby, at the timings of time t32 and time t35, the AP 20 notifies the terminal device 10 only that the data (DTIM) that the terminal device 10 takes in Beacon exists. Then, the data (DTIM) is transmitted from the AP 20 to the terminal device 10 at an arbitrary timing on the terminal device 10 side (that is, the timing at which the terminal device 10 transmits the trigger frame TRG to the AP 20). Therefore, data is not transmitted from the AP 20 to the terminal device 10 during the BT communication period of the terminal device 10, and data is transmitted from the AP 20 to the terminal device 10 at time t33 and time t37. As a result, the terminal device 10 can reliably collect data.

  When operating with Power Save OFF / Power Save ON (U-APSD), the AP 20 normally transmits all the data held for the trigger frame TRG from the terminal device 10. In this case, if there is a large amount of transmission data, transmission may continue even when the Bluetooth communication possible time is switched, colliding with Bluetooth transmission on the terminal device 10 side, and data of both the AP 20 and the terminal device 10 will be lost. There is a fear.

  At this time, the AP 20 recognizes the WLAN communicable time by controlling the transmission timing on the AP 20 side in (1) above, and therefore, when this WLAN communicable time is exceeded, the transmission from the AP 20 is stopped, and the terminal device Transmission is started after waiting for the next trigger frame TRG from 10. As a result, there is no possibility that the AP 20 collides with Bluetooth transmission on the terminal device 10 side.

  In addition, by using Power Save ON without using QoS (Quality of Service), data transmission / reception can be performed on the terminal device 10 side by PS-POLL. When switching QoS settings, re-affiliation processing is required. Furthermore, the transfer efficiency may be reduced with respect to Power Save OFF / Power Save ON (U-APSD).

  Here, an operation for avoiding data collision even when there is a large amount of transmission data from the terminal device 10 will be described with reference to a conceptual diagram. FIG. 6 is a conceptual diagram showing the effect when the AP 20 shown in FIG. 1 performs data transmission only during a WLAN communicable time zone, and the time axis is shown on the horizontal axis in both the upper and lower diagrams. As shown in the upper diagram of FIG. 6, when the trigger frame TRG is transmitted from the terminal device 10 to the AP 20, if the transmission data (Data) from the AP 20 is large, the Bluetooth communication possible time (BT communication time) of the terminal device 10 Even after switching to the transmission data (Data) from the AP 20 to the terminal device 10 may continue. In such a case, the transmission data (Data) from the AP 20 may collide with the Bluetooth transmission data on the terminal device 10 side, and the data of both the AP 20 and the terminal device 10 may be lost. In other words, packet collision occurs and not only retransmission processing is performed, but also rate reduction is likely to occur, and transfer efficiency is greatly degraded.

  Therefore, in order to solve such a problem, as shown in the lower diagram of FIG. 6, the AP 20 recognizes the Bluetooth usage time period (BT communication period) of the terminal device 10 by transmission timing control. In this BT communication period, data is not transmitted to the terminal device 10. When the BT communication period is exceeded, the AP 20 waits for the next trigger frame TRG from the terminal device 10 and starts transmitting the next data. As a result, there is no possibility that the AP 20 collides with Bluetooth transmission on the terminal device 10 side.

<< Second Embodiment >>
In the first embodiment, transmission control specialized for the wireless LAN side is realized, but the present invention is not limited to this. Therefore, in the second embodiment, all the processes described in the first embodiment are realized on the Bluetooth side. As a result, communication efficiency can be further improved. That is, Bluetooth synchronizes the clock with an accuracy of 1.25 msec or less between the master device and the slave device. Therefore, it becomes possible to share the communication availability time zone between the master device and the slave device in the same manner as the above-described wireless LAN. However, since the terminal device that enables simultaneous wireless LAN / Bluetooth communication is either the master device or the slave device depends on the paired device, even if the terminal device is either the master device or the slave device A mechanism for notification is required.

  Although the present invention has been specifically described based on the two embodiments, 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.

  According to the present invention, since data collision and interference between terminal devices can be prevented in the wireless LAN / Bluetooth communication system, it can be effectively used for various terminal devices that perform wireless data communication in the duplex communication mode. Can do.

1 Wireless communication system 10 Terminal equipment 11, 21 CPU
12, 22 RAM
13, 23 Flash ROM
14, 24 Display unit 15, 25 Key input unit 16 Wireless unit 16a Bluetooth unit 16b, 26 Wireless LAN unit 20 AP (Access Point)

Claims (13)

A wireless LAN / Bluetooth dual communication mode, a terminal device that performs wireless communication by time-sharing data A;
A wireless LAN access point that controls data transmission timing based on data A received from the terminal device, and transmits data B during a communicable time avoiding either the Bluetooth communication period or the wireless LAN communication period of the terminal device It equipped with a door,
The data A is three pieces of time information of the terminal device, the wireless LAN occupation time, the Bluetooth occupation time, and the time elapsed since the start of the wireless LAN occupation time,
The wireless communication system, wherein the wireless LAN access point calculates the communicable time based on the three pieces of time information . The wireless LAN access point converts a Multicast Packet transmitted to a plurality of terminal devices into a Unicast Packet transmitted only to one specific terminal device, and transmits this Unicast Packet as data B to the terminal device. The wireless communication system according to claim 1 . The wireless communication system according to claim 2 , wherein the wireless LAN access point transmits data B as a multicast packet without performing data conversion on a packet having data of a transport layer or higher. When transmitting the data B continuously, the wireless LAN access point temporarily stops transmission immediately before reaching either the Bluetooth communication period or the wireless LAN communication period, and the Bluetooth communication period or the wireless LAN after the communication period, according to successive any one of claims 1 to 3, characterized in that to resubmit continue sending data of the data B on the basis of a request signal from the terminal device radio Communications system. The wireless LAN access point configured in a wireless communication system that performs wireless communication control in a duplex communication mode by a wireless LAN / Bluetooth communication method in a time-sharing manner,
Data transmission timing is controlled based on data A received from a terminal device equipped with the wireless LAN / Bluetooth communication method, and data is transmitted in a communicable time avoiding either the Bluetooth communication period or the wireless LAN communication period of the terminal device. It has line transmission of the B,
The data A is three pieces of time information of the terminal device, the wireless LAN occupation time, the Bluetooth occupation time, and the time elapsed since the start of the wireless LAN occupation time,
The wireless LAN access point characterized in that the communicable time is calculated based on the three pieces of time information . The Multicast Packet transmitted to a plurality of terminal devices is converted into a Unicast Packet transmitted only to one specific terminal device, and the Unicast Packet is transmitted as data B to the terminal device. 5. A wireless LAN access point according to 5. The wireless LAN access point according to claim 6 , wherein a packet having data of a Transport layer or higher transmits data B as a Multicast Packet without performing data conversion. When transmitting the data B continuously, temporarily stop transmission immediately before reaching either the Bluetooth communication period or the wireless LAN communication period, and after the end of the Bluetooth communication period or the wireless LAN communication period, wireless LAN access point according to any one of claims 5 to 7 based on the request signal from the terminal device, characterized in that to continue to resend the continuous transmission data of the data B. A terminal device that is equipped with a wireless LAN / Bluetooth communication dual communication mode, and that performs wireless communication by time-sharing data A
In accordance with the data transmission timing controlled by the wireless LAN access point based on the data A, the data B is received from the wireless LAN access point at a communicable time avoiding either the Bluetooth communication period or the wireless LAN communication period ,
A terminal device characterized by transmitting, as the data A, three pieces of time information including a wireless LAN occupation time, a Bluetooth occupation time, and a time elapsed since the start of the wireless LAN occupation time to the wireless LAN access point . A wireless communication method for performing wireless communication control in a duplex communication mode by a wireless LAN / Bluetooth communication method in a time division manner,
A first step in which a terminal device is equipped with the wireless LAN / Bluetooth communication mode duplex communication mode, and performs wireless communication by time-sharing data A;
A second step in which the wireless LAN access point controls data transmission timing based on the data A received from the terminal device;
A wireless LAN access point transmits data B to the terminal device during a communicable time avoiding either the Bluetooth communication period or the wireless LAN communication period of the terminal device based on the data transmission timing. and a step seen including,
The data A includes the wireless LAN occupation time, Bluetooth occupation time, and no data of the terminal device.
3 time information of the time elapsed since the start of the line LAN occupation time,
In the second step, the wireless LAN access point performs the three time information.
A wireless communication method characterized in that the communicable time is calculated based on information. In the third step, the wireless LAN access point converts a Multicast Packet transmitted to a plurality of terminal devices into a Unicast Packet transmitted to only one specific terminal device, and converts the Unicast Packet to data the wireless communication method of claim 1 0, characterized by transmitting the B to the terminal device. The wireless LAN access point, in the third step, the packet having the Transport layer above data, without performing the data conversion, to claim 11, characterized in that the transmission of data B as Multicast Packet The wireless communication method described. When the wireless LAN access point continuously transmits the data B, the transmission is temporarily stopped immediately before reaching either the Bluetooth communication period or the wireless LAN communication period, and the Bluetooth communication period or the wireless LAN communication The wireless communication according to any one of claims 10 to 12 , wherein after the period ends, continuous transmission data of the data B is continuously retransmitted based on a request signal from the terminal device. Method.

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