JP2004350123A - Electronic equipment and data transmission method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide electronic equipment capable of transmitting data with stable throughput. <P>SOLUTION: Time required for transmitting one data frame from an AP1 to a destination STA is calculated (S6), whether or not one data frame is the one to be transmitted to a priority STA is confirmed (S7) and when it is transmitted to the priority STA (yes in S7), whether or not a duration value used in the case of transmitting one data frame last time is stored is confirmed (S8). When the value is stored (yes in S8), whether or not the value is larger than the time calculated in the step S6 is judged (S9), when the value is larger (yes in S9), the duration value regarding transmission of one data frame performed last time is set (S10) in the data frame to be transmitted to the priority STA this time and the one data frame is transmitted from the AP1 to the priority STA (S11). Furthermore, the duration value stored in the AP1 is updated (S12). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wireless communication technology, and more particularly, to an electronic device capable of performing efficient data transmission using a wireless communication technology, and a data transmission method thereof.
[0002]
[Prior art]
2. Description of the Related Art In recent years, IEEE 802.11, which is one of the standards of wireless communication technology, performs wireless communication by a method called CSMA / CA (Carrier Sense Multiple Access Protocol with Collision Aidance).
[0003]
As one of communication systems using the CSMA / CA, there is a DCF (Distributed Coordination Function) system.
[0004]
Basic Service formed by a station that performs wireless communication by the DCF method and has an access point function (hereinafter, referred to as an AP) and a plurality of stations that have no access point function (hereinafter, referred to as an STA). In a Set (hereinafter, referred to as a BSS), the AP and the plurality of STAs compete for a transmission right for performing data transmission, and a device having the transmission right can transmit data. The STA that has obtained the transmission right sets a duration value, which is a time required for transmitting data, in the transmission data frame, and transmits the data to the communication partner device.
[0005]
The STAs (including the AP) other than the STA that transmitted the data set the NAV (Network Allocation Vector) using the set duration value. In this time zone, each STA other than the STA that has transmitted the data determines that the other STA has acquired the transmission right, and the STAs other than the STA that transmitted the data do not perform the transmission right acquisition process. .
[0006]
Now, as an invention for performing wireless communication based on the CSMA / CA scheme, the type of data transmitted from a data terminal is determined, and thereafter, carrier sense and the like are performed to perform wireless communication on the data transmitted from the data terminal. Thus, there is an invention that enables transmission to a communication partner device with priority (see Patent Document 1).
[0007]
[Patent Document 1]
JP-A-8-70307 (page 5, FIG. 4)
[0008]
[Problems to be solved by the invention]
However, according to the above-mentioned invention, by performing carrier sense before data transmission, data can be preferentially transmitted from a data terminal to a communication partner device, but it is not guaranteed that a steady throughput is secured. There is a problem.
[0009]
Also, in the wireless communication method using the DCF scheme described above, transmission opportunities of each STA including the AP are basically equal, so that when transmitting data from each STA including the AP to another STA, Efficient throughput is not guaranteed. For this reason, when stable throughput is required at the time of data transmission, such as streaming transmission of AV (Audio Visual) data, there is a problem that a method using DCF is not suitable.
[0010]
Therefore, an object of the present invention is to provide an electronic device capable of transmitting data to a receiving-side electronic device at a stable throughput.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, in the invention according to claim 1, in an electronic device that transmits data to an external device capable of wireless communication, an address indicating the external device and a throughput value required for wireless communication between the external devices are provided. Receiving means for receiving data, a means for calculating a time required for completing transmission of data to be transmitted to the external device based on the throughput value, and a setting means for setting the value of the time calculated by the calculating means to the data And transmission means for transmitting data to which the time value has been set by the setting means based on the address to an external device.
[0012]
With this configuration, it is possible to reliably transmit all data to be transmitted to the receiving-side electronic device that is the priority transmission destination without depriving other electronic devices of the wireless communication right, thereby achieving stable throughput. Can be secured and transmitted.
[0013]
Further, according to the invention according to claim 6, in an electronic device that receives data from a first external device capable of wired communication and transmits the received data to a second external device capable of wireless communication, Means for receiving a required throughput value required for wireless communication between the present device and the second external device while transmitting the data from the first external device; and transmitting data to the second external device based on the required throughput value. Means for calculating the time required to complete transmission of all data to be transmitted to the second external device, which is included in the device at the time of transmission, and the value of the time calculated by the calculation unit is set; And transmitting means for transmitting one data frame relating to data transmitted to the second external device to the second external device.
[0014]
With such a configuration, the second external device to which data is transmitted using wireless communication is connected without being deprived of communication rights by a plurality of external devices other than the first external device while being connected by wire. By transmitting all data reliably, it is possible to secure and transmit a stable throughput.
[0015]
According to a tenth aspect of the present invention, in the data transmission method for transmitting data to an external device capable of wireless communication, an address indicating the external device and a throughput value required for wireless communication with the external device are received. Based on the value, calculate the time required to complete the transmission of the data to be transmitted to the external device, set the value of the time calculated by the calculating means to the data, and set the time value by the setting means based on the address. Is transmitted to the external device.
[0016]
With this configuration, it is possible to reliably transmit all data to be transmitted to the receiving-side electronic device that is the priority transmission destination without depriving other electronic devices of the wireless communication right, thereby achieving stable throughput. Can be secured and transmitted.
[0017]
In the invention according to claim 14, it is possible to receive data from the first external device capable of wired communication and transmit the received data to the second external device capable of wireless communication. In a data transmission method used by a certain electronic device, a request is transmitted from a first external device, and a required throughput value required for wireless communication with a second external device is received. The electronic device has the electronic device at the time of transmitting data to the second external device, and calculates the time required to complete the transmission of all data transmitted to the second external device. In addition to the setting, one data frame relating to data transmitted to the second external device is transmitted to the second external device.
[0018]
With such a configuration, the second external device to which data is transmitted using wireless communication is connected without being deprived of communication rights by a plurality of external devices other than the first external device while being connected by wire. By transmitting all data reliably, it is possible to secure and transmit a stable throughput.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment according to the present invention will be described as applied to wireless communication conforming to the IEEE 802.11 standard.
[0020]
Embodiments according to the present invention will be described below with reference to the drawings.
[0021]
FIG. 1 is a diagram illustrating a BSS composed of STAs and APs.
[0022]
The BSS 6 shown in FIG. 1 includes an AP 1, a first STA 2, a second STA 3, a third STA 4, and a fourth STA 5. The AP 1 serves as a concentrator that accommodates a plurality of wireless communication terminals. Further, the first STA2, the second STA3, the third STA4, and the fourth STA5 are a group of wireless communication terminals accommodated by the AP1. The communication area of the BSS 6 is called a basic service area (Basic Service Area) (hereinafter, referred to as BSA), and within this area, the AP 1 and the STA group can wirelessly communicate with each other.
[0023]
FIG. 2 is a hardware block diagram of the STA.
[0024]
The first bridge circuit 12 is connected to a CPU (Central Processing Unit) 11, a main memory 13, a display 14, and a second bridge circuit 15.
[0025]
The CPU 11 controls the entire STA, performs data calculations, and the like.
[0026]
The main memory 13 stores an OS (Operating System), a device driver, an application program to be executed, data related to transmission and reception, and the like.
[0027]
The display 14 displays various information. For example, information and the like relating to the transmitted and received data are displayed using an application or the like.
[0028]
The second bridge circuit 15 is connected to the magnetic disk device 16 and the IEEE 802.11 wireless module 17.
[0029]
The magnetic disk device 16 stores an OS, a device driver, an application program to be executed, and the like, and is transferred to the main memory 13 as appropriate.
[0030]
The IEEE 802.11 compliant wireless module 17 is configured by hardware necessary for performing wireless communication conforming to IEEE 802.11. For example, it includes an RF unit, a BaseBand unit, a MAC unit, and the like.
[0031]
The hardware configuration of the AP is basically the same as that of the STA except that the display 14 is unnecessary. STA information, duration values, and the like are stored in the main memory of the AP.
[0032]
A first embodiment according to the present invention, in which data is reliably transmitted from an AP to a specific STA, will be described.
[0033]
FIG. 3 is a diagram illustrating a configuration of an electronic device group when data is transmitted from an AP to a STA designated as a priority transmission destination.
[0034]
As shown in FIG. 3, the AP 1 can be wirelessly connected to each of the first STA 2, the second STA 3, and the third STA 4. Among the STA group including the first STA2, the second STA3, and the third STA4, an STA to which data is transmitted preferentially from the AP (hereinafter, referred to as a priority STA) is determined ( Second STA 3 in FIG. 9).
[0035]
Hereinafter, an operation in a case where data is preferentially transmitted from the AP to the priority STA will be described.
[0036]
FIG. 4 is a flowchart illustrating a registration procedure of a priority STA in the STA group.
[0037]
FIG. 5 is a table showing information on a connectable STA group managed by the AP.
[0038]
AP1 receives a connection request from STA to AP1 (step S1). After receiving the connection request, a connection process is performed between the AP and the STA that issued the connection request (step S2). Further, it is confirmed whether or not there is a request to transmit data preferentially from the STA that has transmitted the connection processing request (step S3). If there is a request (step S3 yes), the STA that has transmitted the connection request is registered as a priority STA (step S4). On the other hand, when there is no request (step S3 no), the STA that has transmitted the connection request is registered as an STA to which data is not preferentially transmitted from the AP (hereinafter, referred to as a normal STA) (step S5).
[0039]
The information on the STA group that is managed and connectable by the AP 1 is, for example, the contents of a table 32 shown in FIG. As shown in the row 32a of the table 32, appropriate values are set for the required throughput value and the Duration value for the second STA3 (see FIG. 9) that is the priority STA.
[0040]
FIG. 6 is a diagram showing duration values according to the present invention and necessary for transmitting one data frame.
[0041]
FIG. 7 is a format diagram of a data frame.
[0042]
Hereinafter, a specific example will be described. The throughput required for the wireless communication performed between the AP and the STA is 8 Mbps, and the data size in one data frame is 1000 bytes. The actual size of one data frame is larger than 1000 bytes because it is a size obtained by adding a synchronization signal and various information for wireless LAN in addition to data. The time required for transmitting one data frame to the wireless communication partner device is a value obtained by dividing the size of one data frame by the required throughput value. The time required to complete the transmission of this one data frame includes the transmission time of the data frame (t3), the confirmation time of the use status of the wireless medium, the waiting time until the start of Ack transmission (t4), The time becomes a time in consideration of the Ack transmission time (t5) and the like.
[0043]
When it is desired to transmit, for example, ten data frames described above in succession, as shown in FIG. 7, a value obtained by multiplying the time required for transmitting one data frame by 10 as one duration ID 31 is used. Set to data frame. Further, for example, when eight out of ten data frames to be transmitted have been transmitted and a ninth data frame is transmitted, the time required to continuously transmit ten data frames is given by: Time required to transmit eight consecutive data frames (this time is obtained by taking the product of the time required to transmit one data frame and the number of data frames that have been transmitted. ) Is subtracted, and the value obtained by the subtraction is set in the ninth data frame.
[0044]
FIG. 8 is a first flowchart illustrating a transmission processing procedure of one data frame constituting data transmitted from the AP to the priority STA.
[0045]
AP1 calculates the time required to transmit one data frame transmitted from AP1 to the destination STA (step S6). The calculation of the transmission time is performed based on a data transmission rate between the AP 1 and the destination STA, a transmission data length transmitted from the AP 1 to the destination STA, and the like. After calculating the transmission time for one data frame to be transmitted, it is determined whether or not the one data frame is one data frame to be transmitted to the priority STA described with reference to FIG. Confirm (step S7). This confirmation is performed based on the information on the connectable STA group registered in the AP 1 described with reference to FIG.
[0046]
When one data frame transmitted from AP1 is one data frame transmitted to the second STA3, which is the priority STA (step S7 yes), the data frame transmitted from AP1 to the second STA3 last time is transmitted. It is checked whether or not the duration value used for transmitting one data frame (hereinafter referred to as the previous duration value) is stored (step S8). Note that when one data frame transmitted from the AP 1 is not one data frame transmitted to the second STA 3 which is the priority STA (step S7 no) (shift to (1) in FIG. 8) The processing procedure will be described later.
[0047]
If the previous duration value is stored (step S8 yes), the duration value is the value of the time required for transmitting one data frame from the AP 1 to the second STA 3 this time (the time calculated in step S6). ) Is determined (step S9).
[0048]
If the previous duration value is larger (step S9 yes), the previous duration value is set in the data frame relating to the data transmitted to the second STA3 which is the priority STA this time (step S10). The processing procedure when the previous duration value is smaller (step S9 no) (shift to (1) in FIG. 8) will be described later.
[0049]
Thereafter, one data frame in which the duration value is set is transmitted from AP1 to the second STA3, which is the priority STA (step S11). Further, an operation of updating the duration value stored in AP1 is performed (step S12). The updated duration value is obtained by subtracting the time value (the time calculated in step S6) required for transmitting data from the AP1 to the second STA2, which is the priority STA, from the previous duration value.
[0050]
As a result of checking whether or not the previous duration value is stored, if the previous duration value is not stored (step S8 no), the information about the connectable STA group registered in AP1 described in FIG. Based on the required throughput value of the priority STA and the current data transmission rate between the AP 1 and the priority STA, a duration value required to complete the transmission of all data currently transmitted from the AP to the priority STA is calculated (step S13). The processes in steps S8 and S13 are performed when data transmission from the AP 1 to the priority STA is started.
[0051]
Further, the duration value calculated in step S13 is set in the data frame relating to the data transmitted to the second STA 3 this time (step S14). Thereafter, the processing procedure from step S11 described above is performed.
[0052]
FIG. 9 is a second flowchart illustrating a transmission processing procedure of one data frame constituting data transmitted from the AP to the STA.
[0053]
In the first flowchart showing the procedure for transmitting one data frame from the AP to the priority STA described with reference to FIG. 8, one data frame transmitted from AP1 to the second STA3 is the priority STA. If the data frame is not one data frame transmitted from the AP (step S7 no), the previous duration value is compared with the value of the time required to transmit data from the AP1 to the second STA3 this time, and the previous duration value Is smaller, that is, when transmitting the last data frame among the total data frames transmitted from the AP 1 to the priority STA this time (step S9 no), the time required to complete the transmission of the data frame Is set as the duration value. When a data frame in which (Ack transmission time + SIFS) is set is used as the data frame in which the duration value is set, it is possible to maintain compatibility with a wireless communication technology conforming to IEEE 802.11 (step S15). Thereafter, the AP1 transmits the one data frame to the second STA3 using the data frame in which the duration value is set (step S16).
[0054]
After transmitting one data frame from AP1 to the second STA3, it is checked whether or not the duration value remains (step S17). If the duration value remains (yes at step S17), the data is stored in the AP1. The update operation of the current duration value is performed (step S12 shown in FIG. 8).
[0055]
By performing the processing procedure described above, the AP owns the information of the wireless communication partner electronic device that preferentially transmits data, and based on this information, the AP to be transmitted to the communication partner electronic device at each time. By calculating the time required to complete the data transmission and using that value as the duration value, the electronic device group other than the communication partner electronic device sets the value as NAV, and the electronic device group has In order to stop the transmission operation at the indicated time, the AP reliably transmits all the data to be transmitted without transmitting the wireless communication right to a group of electronic devices other than the communication partner electronic device while transmitting all the data. This makes it possible to secure a stable throughput to the communication destination electronic device and transmit the same.
In addition, when one data frame transmitted from the AP to the second STA is not one data frame transmitted from the priority STA, and among the total data frames transmitted from the AP to the priority STA, When transmitting one data frame to be transmitted, the time required to complete the transmission of the data frame transmitted last is used as the duration value, so that the priority STA does not monopolize the wireless communication right, After completing the transmission of one data packet, another STA can perform wireless communication with the AP. Further, by using (Ack transmission time + SIFS) as the duration value, it is possible to maintain compatibility with a wireless communication technology conforming to IEEE 802.11.
[0056]
A second embodiment according to the present invention, in which data is reliably transmitted from a specific electronic device to an STA via an AP will be described.
[0057]
FIG. 10 is a diagram illustrating a configuration of an electronic device group when data transmitted from a specific electronic device is transmitted to the STA via the AP.
[0058]
As shown in FIG. 10, the first electronic device 20, the second electronic device 21, and the third electronic device 22 are connected to AP1 by wire. Further, the communication method between the AP 1 and the first STA 2 is wireless communication.
[0059]
Hereinafter, an operation in the case where data transmitted from a specific electronic device is preferentially transmitted to the STA via the AP will be described.
[0060]
FIG. 11 is a flowchart illustrating a processing procedure for registering a specific electronic device in the AP.
[0061]
FIG. 12 is a diagram illustrating information transmitted to the AP and indicating a specific electronic device.
[0062]
AP1 is activated (step S18). Next, the AP 1 checks whether data indicating the priority transmission source is transmitted from an electronic device capable of transmitting data preferentially to the AP 1 (hereinafter, referred to as a priority transmission source). As shown in FIG. 12, the contents of the data indicating the priority transmission source include a MAC (Media Access Control) address assigned to the electronic device serving as the priority transmission source and a requested throughput value between AP1 and the STA serving as the data transmission destination. And so on. When the AP 1 receives data indicating the priority transmission source from the priority transmission source (step S19 yes), the data indicating the priority transmission source is registered in the AP 1 (step S20).
[0063]
FIG. 13 is a first flowchart illustrating a transmission processing procedure of one data frame transmitted from the AP to the STA when data is transmitted from the specific electronic device to the STA via the AP.
[0064]
AP1 calculates the time required to transmit one data frame transmitted from AP1 to first STA2 shown in FIG. 10 (step S21). The calculation of the transmission time is performed based on a data transmission rate between the AP 1 and the first STA 2, a transmission data length transmitted from the AP 1 to the first STA 2, and the like. After calculating the transmission time of one data frame to be transmitted, it is determined whether the one data frame is one data frame transmitted from the priority transmission source described with reference to FIG. (Step S22). This confirmation is performed in step S20 in FIG. 12 and is performed using a MAC address or the like included in data indicating a priority transmission source registered in AP1.
[0065]
When one data frame transmitted from the AP 1 to the first STA 2 is one data frame related to data transmitted from the priority transmission source (step S22yes), the data transmitted from the priority transmission source last time is determined. It is confirmed whether or not the duration value (hereinafter referred to as the previous duration value) used when transmitting one data frame according to the above from the AP 1 to the first STA 2 is stored (step S23). The processing procedure when the data transmitted from the AP 1 to the first STA 2 is not the data transmitted from the priority transmission source (No in step S22) (move to (1) in FIG. 13) will be described later.
[0066]
When the previous duration value is stored (step S23 yes), the duration value is the value of the time required to transmit one data frame from the AP 1 to the first STA 2 this time (the time calculated in step S21). ) Is determined (step S24).
[0067]
If the previous duration value is larger (step S24 yes), the previous duration value is set in the data frame related to the data transmitted to the first STA2 which is the priority STA this time (step S25). The processing procedure when the previous duration value is smaller (step S24 no) (shift to (1) in FIG. 13) will be described later.
[0068]
Thereafter, one data frame in which the duration value is set is transmitted from AP1 to first STA2 (step S26). Further, an operation of updating the duration value stored in AP1 is performed (step S27). The updated duration value is obtained by subtracting the value of the time required to transmit data from the AP 1 to the first STA 2 this time (the time calculated in step S21) from the previous duration value.
[0069]
As a result of checking whether or not the previous duration value is stored, if the previous duration value is not stored (step S23 no), the priority transmission transmitted from the priority transmission source described in FIG. Based on the required throughput value included in the data indicating the origin and the current data transmission rate between the AP 1 and the first STA 2, it is necessary to complete the transmission of all the data currently transmitted from the AP to the first STA 2. A duration value is calculated (step S28). It should be noted that the processes of step S23 no and step 28 are performed at the start of data transmission from the AP 1 to the first STA 2.
[0070]
Further, the duration value calculated in step S28 is set in the data frame related to the data transmitted to the first STA 2 this time (step S29). Thereafter, the processing procedure from step S26 described above is performed.
[0071]
One data frame transmitted from AP1 to the first STA2 in the first flowchart described with reference to FIG. 13 and showing the procedure for transmitting one data frame from AP1 to the first STA2 has priority. If it is not one data frame related to the data transmitted from the transmission source (step S22 no), the previous duration value is compared with the value of the time required for transmitting data from the AP1 to the first STA2 this time. If the previous duration value is smaller than the previous one, that is, if the last transmitted data frame of the total data frames transmitted from the AP1 to the first STA2 this time is transmitted (step S24 no), the data frame is The time required to complete the transmission is set as a duration value. When a data frame in which (Ack transmission time + SIFS) is set is used as the data frame in which the duration value is set, it is possible to maintain compatibility with a wireless communication technology conforming to IEEE 802.11 (step S15). Thereafter, using the data frame in which the duration value is set, the one data frame is transmitted from the AP 1 to the first STA 2 (step S16).
[0072]
After transmitting one data frame from the AP 1 to the first STA 2, it is checked whether or not a duration value remains (step S 17). If the duration value remains (step S 17 yes), it is stored in the AP 1. The update operation of the current duration value is performed (step S27 shown in FIG. 13).
[0073]
By performing the processing procedure described above, the AP is connected by wire, owns at least information on the electronic device that is the priority transmission source, and transmits all data to be transmitted to the communication partner electronic device at each time. Calculate the time required for completion, use that value as the duration value, and refer to the MAC address of the priority transmission source to assign the communication right to the electronic device group that is connected by wire and other than the priority transmission source. By securely transmitting all data to the STA to which data is transmitted using wireless communication without being deprived, it is possible to secure stable transmission and transmit.
[0074]
In addition, when one data frame transmitted from the AP to the STA is not one data frame transmitted from the priority transmission source, and among the total data frames transmitted from the AP to the STA, the data frame is transmitted last. When transmitting one data frame, the time required to complete the transmission of the data frame transmitted last is used as the duration value, so that the priority transmission source does not monopolize the communication right, After the transmission of the data packet is completed, a group of other electronic devices connected by wire can communicate with the AP. Further, by using (Ack transmission time + SIFS) as the duration value, it is possible to maintain compatibility with a wireless communication technology conforming to IEEE 802.11.
[0075]
Note that the present invention is not limited to the first embodiment and the second embodiment, but may be an embodiment in which these embodiments are combined. That is, information on the electronic device that is the priority transmission source in the electronic device group connected to the AP by wire and information on the STA that is the priority STA in the STA group that performs wireless communication with the AP are stored in the AP. On the basis of these pieces of information, it is also possible to transmit all data to be transmitted at a stable throughput from the electronic device as the priority transmission source to the electronic device as the priority transmission destination via the AP.
[0076]
The present invention is not limited to the above embodiment as long as it does not depart from the gist of the present invention. The present invention can be widely applied not only to wireless technology conforming to the IEEE 802.11 standard, but also to wireless technology similar to wireless technology conforming to the IEEE 802.11 standard.
[0077]
【The invention's effect】
According to the above-described invention, it is possible to transmit data at a stable throughput to a receiving-side electronic device.
[Brief description of the drawings]
FIG. 1 is a diagram showing a BSS composed of an STA group and an AP.
FIG. 2 is a hardware block diagram of the STA.
FIG. 3 is a diagram showing a configuration of an electronic device group when data is transmitted from an AP to a STA designated as a priority transmission destination.
FIG. 4 is a flowchart illustrating a registration procedure of a priority STA in the STA group.
FIG. 5 is a table showing information on a connectable STA group managed by the AP.
FIG. 6 is a diagram showing a duration value according to the present invention and necessary for transmitting one data frame.
FIG. 7 is a format configuration diagram of a data frame.
FIG. 8 is a first flowchart showing a transmission procedure of one data frame constituting data transmitted from the AP to the priority STA.
FIG. 9 is a second flowchart showing a transmission processing procedure of one data frame constituting data transmitted from the AP to the STA.
FIG. 10 is a diagram illustrating a configuration of an electronic device group in a case where data transmitted from a specific electronic device is transmitted to an STA via an AP.
FIG. 11 is an exemplary flowchart showing a processing procedure for registering a specific electronic device in an AP.
FIG. 12 is a view showing information transmitted to the AP and indicating a specific electronic device.
FIG. 13 is a first flowchart illustrating a transmission processing procedure of one data frame transmitted from the AP to the STA when data is transmitted from the specific electronic device to the STA via the AP.
[Explanation of symbols]
1 ... AP, 2 ... first STA, 3 ... second STA, 4 ... third STA,
5: fourth STA, 6: BSS, 11: CPU, 12: first bridge circuit,
13 ... main memory, 14 ... display, 15 ... second bridge circuit,
16: magnetic disk drive, 17: IEEE 802.11 compliant wireless module,

Claims (16)

In an electronic device that transmits data to an external device capable of wireless communication,
Receiving means for receiving an address indicating the external device and a throughput value required for wireless communication with the external device,
Means for calculating a time required to complete transmission of data to be transmitted to the external device, based on the throughput value;
Setting means for setting the value of the time calculated by the calculating means in the data,
Transmitting means for transmitting the data in which the value of the time is set by the setting means to the external device based on the address;
An electronic device comprising: In an electronic device that transmits data to an external device capable of wireless communication,
Receiving means for receiving an address indicating the external device transmitted from the external device and a required throughput value required for wireless communication between the external devices,
Based on the required throughput value, the present device has at the time of transmitting data to the external device, and means for calculating the time required to complete transmission of all data transmitted to the external device,
Based on the address, a value of the time calculated by the calculation unit is set, and a transmission unit that transmits one data frame related to data transmitted to the external device to the external device,
An electronic device comprising: In an electronic device that transmits data to an external device capable of wireless communication,
Means for receiving an address indicating the external device transmitted from the external device and a required throughput value required for wireless communication with the external device,
Means for calculating a time required to complete transmission of all data transmitted to the external device, based on the required throughput value,
Means for calculating a time required to transmit one data frame transmitted to the external device based on the required throughput value;
From the value of the time required to complete the transmission of all data transmitted to the external device, the value of the time required to transmit the one data frame and the number of data frames transmitted to the external device are calculated. Means for calculating a value set in the one data frame by subtracting a value of a product;
Transmitting means for transmitting the one data frame in which a value set in the one data frame is set to the external device based on the address;
An electronic device comprising: Not only the external device, after considering the external device different from the external device, after calculating the time required to transmit one data frame related to data transmitted to these external device group,
It is determined whether the one data frame is a data frame transmitted to the external device,
When the one data frame is one data frame transmitted to an external device different from the external device, the transmission of the one data frame is set as a value set in the one data frame. 4. The electronic device according to claim 2, wherein a value of a time required to complete the setting is set. The electronic device according to claim 4, wherein the value of the time required to complete the transmission of the one data frame is a sum of an Ack transmission time value and a SIFS time value. An electronic device that receives data from a first external device capable of wired communication and transmits the received data to a second external device capable of wireless communication,
Means for receiving a required throughput value transmitted from the first external device and required for wireless communication between the device and the second external device;
Based on the requested throughput value, calculate the time required for the device to transmit data to the second external device and to complete the transmission of all data transmitted to the second external device. Means,
A transmitting unit configured to set a value of the time calculated by the calculating unit and transmitting one data frame related to data transmitted to the second external device to the second external device;
An electronic device comprising: An electronic device that receives data from a first external device capable of wired communication and transmits the received data to a second external device capable of wireless communication,
Means for receiving, from the first external device, a required throughput value required for wireless communication between the device and the second external device;
Means for calculating a time required to complete transmission of all data transmitted to the second external device, based on the required throughput value;
Means for calculating a time required to transmit one data frame related to data transmitted to the second external device based on the required throughput value;
From the value of the time required to complete the transmission of all the data transmitted to the second external device, the value of the time required to transmit the one data frame and the data transmitted to the second external device Means for calculating a value to be set for the one data frame by subtracting a product value of the number of frames and
Transmitting means for transmitting the one data packet in which the value set in the one data frame is set to the second external device;
An electronic device comprising: Means for receiving an address transmitted from the first external device and indicating the first external device;
Considering not only the first external device but also external devices capable of wired communication other than the first external device, one device related to data transmitted from a group of external devices capable of wired communication is also considered. After calculating the time it takes to send a data frame,
Using an address indicating the first external device, determine whether the one data frame is one data frame related to data transmitted from the first external device,
When the one data frame is one data frame relating to data transmitted from an external device capable of performing wired communication other than the first electronic device, a value set in the one data frame 8. The electronic device according to claim 6, wherein a time required for completing transmission of the one data frame is set. 9. The electronic device according to claim 8, wherein the value of the time required to complete the transmission of the one data frame is a sum of an Ack transmission time value and a SIFS time value. In a data transmission method for transmitting data to an external device capable of wireless communication,
Receives an address indicating the external device and a throughput value required for wireless communication between the external devices,
Based on the throughput value, calculate the time required to complete the transmission of the data transmitted to the external device,
The value of the time calculated by the calculation means is set in the data,
And transmitting the data to which the time value has been set by the setting means to the external device based on the address. In a data transmission method for transmitting data to an external device capable of wireless communication,
An address indicating the external device transmitted from the external device and a required throughput value required for wireless communication between the external devices are received,
Based on the required throughput value, the present device has at the time of transmitting data to the external device, and calculates the time required to complete transmission of all data transmitted to the external device,
The data, wherein the time value calculated by the calculation means is set using the address, and one data frame relating to data transmitted to the external device is transmitted to the external device. Transmission method. In a data transmission method for transmitting data to an external device capable of wireless communication,
An address indicating the external device transmitted from the external device and a required throughput value required for wireless communication between the external devices are received,
Based on the required throughput value, calculate the time required to complete transmission of all data transmitted to the external device,
Based on the required throughput value, calculate the time required to transmit one data frame transmitted to the external device,
From the value of the time required to complete the transmission of all data transmitted to the external device, the product of the value of the time required to transmit the one data frame and the number of data frames transmitted to the external device Calculate the value set in the one data frame by subtracting the value of
A data transmission method, wherein the one data frame in which a value set in the one data frame is set based on the address is transmitted to the external device. Not only the external device, after considering the external device different from the external device, after calculating the time required to transmit one data frame related to data transmitted to these external device group,
It is determined whether the one data frame is a data frame transmitted to the external device,
When the one data frame is one data frame transmitted to an external device different from the external device, the transmission of the one data frame is set as a value set in the one data frame. 13. The data transmission method according to claim 11, wherein a value of a time required to complete is set. A data transmission method used by an electronic device capable of receiving data from a first external device capable of wired communication and transmitting the received data to a second external device capable of wireless communication At
A request throughput value transmitted from the first external device and required for wireless communication with the second external device is received,
Based on the requested throughput value, calculate the time required for the electronic device to have the electronic device at the time of transmitting data to the second external device and to complete the transmission of all data transmitted to the second external device. And
The time value calculated by the calculation means is set, and one data frame relating to data transmitted to the second external device is transmitted to the second external device. Transmission method. A data transmission method used by an electronic device capable of receiving data from a first external device capable of wired communication and transmitting the received data to a second external device capable of wireless communication At
While being transmitted from the first external device, receiving a required throughput value required for wireless communication between the electronic device and the second external device,
Based on the required throughput value, calculate a time required to complete transmission of all data transmitted to the second external device,
Calculating a time required to transmit one data frame related to data transmitted to the second external device based on the required throughput value;
From the value of the time required to complete the transmission of all the data transmitted to the second external device, the value of the time required to transmit the one data frame and the data transmitted to the second external device Calculating the value set in the one data frame by subtracting the value of the product with the number of frames;
A data transmission method, wherein the one data frame in which a value set in the one data frame is set is transmitted to the second external device. While being transmitted from the first external device, receiving an address indicating the first external device,
Considering not only the first external device but also external devices capable of wired communication other than the first external device, one device related to data transmitted from a group of external devices capable of wired communication is also considered. After calculating the time it takes to send a data frame,
Using an address indicating the first external device, determine whether the one data frame is one data frame related to data transmitted from the first external device,
When the one data frame is one data frame relating to data transmitted from an external device capable of performing wired communication other than the first electronic device, a value set in the one data frame 16. The data transmission method according to claim 14, wherein a time required for completing transmission of the one data frame is set.

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