JP2002190806A - Radio communication system, medium and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a master slave type radio communication system that automatically and adaptively realizes a radio communication system having a radio data link optimum to a communication characteristic of a host layer of a protocol stack and requirement communication quality. SOLUTION: The radio communication system has radio communication terminals. The radio communication terminal is provided with a communication quality decision means that decides the requirement communication quality in communication with other radio communication terminal, a communication quality notice means that informs the other radio communication terminal about the requirement communication quality decided by the communication quality decision means and a role revision means that changes roles between a master terminal and slave terminals according to a master instruction signal. One of the radio communication terminals is a role management terminal that is provided with a role management means that decides a radio communication terminal to be the master terminal on the basis of the requirement communication quality received from the other radio communication terminals and generates the master instruction signal to designate the radio communication terminal acting like the master terminal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a radio communication system, a recording medium on which a program for a radio communication terminal is recorded, and a program for a radio communication terminal.

[0002]

2. Description of the Related Art In recent years, wireless communication systems (wireless communication networks) conforming to standards such as Bluetooth have been developed. Hereinafter, a conventional wireless communication system (wireless communication network) will be described with reference to FIG.

FIG. 5 shows an example of a wireless communication system, BL
FIG. 2 is a configuration diagram of an example in which a wireless communication network is configured by uetooth. In FIG. 5, 500, 501,
Reference numerals 502, 503, and 504 denote wireless communication terminals. The wireless communication terminal 500 includes a Bluetooth protocol stack 505
~ 508. Reference numeral 505 denotes an RF (Radio Frequency) layer of the Bluetooth protocol stack and an LC (Link Co.)
ntroller) layer and LM (Link Manager) layer, 506
L2CAP (Logic
al Link and Control Adaptation Protocol) and RFCOMM (Serial Cable Emulation Protocol)
Layer 507 is a protocol stack of a PPP (Point-to-Point Protocol) layer, and 508 is an IP (Internet Protocol).
l) Protocol stack of layers.

[0004] Wireless communication terminals 501, 502, 503, 5
04, like the wireless communication terminal 501,
It has a Bluetooth protocol stack including layers and an IP layer. In Bluetooth, one wireless communication terminal is a master, and one or more other wireless communication terminals are slaves to form a wireless communication network (piconet). Wireless data links can be established between masters and slaves, but not between slaves.

In FIG. 5, a wireless communication terminal 500 is a Bluetooth
Master, wireless communication terminals 501, 502, 50
Reference numerals 3 and 504 denote a configuration in which a slave in Bluetooth is used. That is, the wireless communication terminal 500 and the wireless communication terminal 501, and the wireless communication terminal 500 and the wireless communication terminal 50
2, between the wireless communication terminal 500 and the wireless communication terminal 503, and between the wireless communication terminal 500 and the wireless communication terminal 504,
A data link has been established that connects the wireless data link of the tooth and the IP layer that is the upper layer of the protocol of each wireless communication terminal.

[0006] The IP layer of the wireless communication terminal as a slave,
For example, the IP layer of the wireless communication terminal 501 and the wireless communication terminal 5
Communication with the IP layer 04 is relayed by the IP layer of the wireless communication terminal 500 that is the master. That is, the IP (Integer) transmitted from the IP layer 508 of the wireless communication terminal 501
rnet Protocol) packet 510 is first transmitted via the wireless data link between the IP layer of the wireless communication terminal 501 and the IP layer of the wireless communication terminal 500.
To the IP layer. Next, the IP packet 510 is transmitted between the IP layer of the relayed wireless communication terminal 500 and the wireless communication terminal 50.
The wireless communication terminal 504 reaches the IP layer via a wireless data link between the wireless communication terminal 504 and the IP layer 4.

[0007]

However, in the above configuration, the performance of the wireless data link layer of the wireless communication system (wireless communication network) cannot always be used efficiently. For example, in FIG.
01, the file server operates as an upper application of the IP layer, and the wireless communication terminals 500, 502, 503,
If the client operates at 504 and most of the traffic on this network is to access a file server, most of the traffic is relayed by the wireless communication terminal 500.

That is, most of the data is transmitted via a wireless data link between the client wireless communication terminal and the master wireless communication terminal 500 and the master wireless communication terminal 50.
0 and the wireless communication terminal 501 of the file server. Since most of the data passes through the wireless data link twice, network performance is significantly reduced.

Also, for example, when communication of an application in an upper layer of a protocol requiring a real-time property is performed between wireless communication terminal 501 and wireless communication terminal 504, the communication is performed by wireless communication terminal 500.
Will be relayed at Since the data is transmitted twice via the wireless data link in this manner, the transmission delay time increases, and the real-time property may be impaired. As described above, the conventional wireless communication system has a problem that the characteristics of the wireless communication system (wireless communication network) cannot be matched with the required communication quality of communication in the upper layer of the protocol.

[0010] The present invention solves the above problems, and automatically configures a wireless communication system (wireless communication network) adapted to the communication characteristics and the required communication quality of the upper layer of the protocol, thereby improving the efficiency of the wireless data link. It is an object of the present invention to provide a high-performance wireless communication system (wireless communication network) that is frequently used. The present invention provides a wireless communication system that automatically and adaptively constructs a wireless communication system having an optimal wireless data link by determining a master wireless communication terminal based on required communication quality and the like. The purpose is to:

[0011]

Means for Solving the Problems To solve the above problems, the present invention has the following arrangement. The invention according to claim 1 of the present invention has a plurality of wireless communication terminals, one of the wireless communication terminals is a master, the other is a slave,
In the wireless data link layer, only communication between a master and a slave is possible, and communication between slaves is a wireless communication system relayed by a master, wherein the wireless communication terminal includes the wireless communication terminal and another wireless communication terminal. Communication quality determination means for determining a required communication quality in communication with a communication terminal, communication quality notification means for notifying the required communication quality determined by the communication quality determination means to a role management means, and from the role management means And a role changing unit for changing a role of a master and a slave in accordance with the master instruction signal, and inputting a transmitted master instruction signal for instructing a transmitted wireless communication terminal to be a master, at least one of the wireless communication terminals Inputting the required communication quality notified from each of the wireless communication terminals, and Determining the communication terminal, further comprising the role management unit that generates the master command signal,
A wireless communication system characterized by the above.

In a conventional wireless communication system, the master is determined by, for example, using the device that first transmitted data in the wireless communication system as the master. However, such a decision method, which depends on chance, has not always been a wireless communication system with an efficient wireless data link when looking at the overall architecture of the wireless communication system. Further, even if the user first determines the optimum master, the master that has been initially fixedly set may not be the optimum master due to a change in data traffic thereafter. The present invention has an effect that a wireless communication system having an optimal data link can be realized automatically and adaptively by determining a master wireless communication terminal based on required communication quality.

[0013] Depending on what executable file runs in the software layer, which is the upper layer of the protocol architecture, or what data the user transmits to another wireless communication terminal, The type of data that a communication terminal communicates with another wireless communication terminal differs. If the type of data differs, the communication quality required for communication also changes. According to the present invention, a wireless communication system having an optimal wireless data link can be automatically and adaptively realized by determining a wireless communication terminal to be a master based on a required communication quality in communication in a higher layer of a protocol. It has the action of:

For example, by attaching data of required communication quality to each execution file and determining a master wireless communication terminal based on the required communication quality, a wireless communication having an optimal wireless data link for each execution file is performed. The system can be realized automatically and adaptively. The type of data communicated differs depending on what application file the user executes or what data the user transmits. According to the present invention, communication with another wireless communication terminal via an upper layer of a protocol for executing an application file or transmitting user data (or a lower layer functioning according to the upper layer) is performed by the present invention. It can be optimized according to the type of data to be communicated.

For example, in the Bluetooth protocol, an IP (Internet Protocol) layer manages data communication with another wireless communication terminal. Communication with another wireless communication terminal via the IP layer can be optimized by the present invention.

A "wireless communication terminal" refers to any device that performs wireless communication with another wireless communication terminal. For example, Blueto
Like many devices that follow the oth protocol, the main function of the wireless communication terminal may be other than wireless communication (for example, an optical disk recording / reproducing device having a wireless communication function). "Data link layer" means a layer of a protocol architecture in which wireless communication terminals communicate with each other. “Wireless data link” means a wireless communication path that connects two wireless communication terminals. "Wireless communication network"
It refers to the entire network of wireless communication terminals that are interconnected. The “required communication quality” means a condition necessary for a wireless communication terminal to communicate with another wireless communication terminal without any trouble. For example, the minimum required transmission speed of data, the maximum allowable transmission delay time, and the like.

In the invention according to claim 2 of the present invention, the required communication quality is a required transmission rate, and the role management means inputs the required transmission rate notified from each of the wireless communication terminals, For each of the wireless communication terminals, calculate the sum of the required transmission speeds of the communication having the wireless communication terminal as an end point, and determine the wireless communication terminal having the largest sum of the required transmission speeds as a master. A wireless communication system according to claim 1.

The present invention reduces the amount of traffic relayed by a master by setting a wireless communication terminal requiring a large transmission capacity as a master, and automatically and adaptively provides a wireless communication system having an optimum wireless data link. It has the effect that it can be realized. The “end point” means a start point or an end point of communication. Does not include relay points.

The present invention does not exclude other conditions when determining the master wireless communication terminal. This applies to the other claims. For example, even if the wireless communication terminal having the largest sum of the required transmission rates is not able to become the master due to other conditions, the wireless communication terminal having the smallest sum of the required transmission rates is smaller than the wireless communication terminal. The communication terminal can be determined as the master. Such a wireless communication system is also included in the technical scope of the present invention if it satisfies the requirements of the present invention.

In the invention according to claim 3 of the present invention, the required communication quality is a required transmission delay time, and the role management means inputs the required transmission delay time notified from each of the wireless communication terminals. Calculating, for each of the wireless communication terminals, the sum of the required transmission delay times of communication having the wireless communication terminal as an end point, and determining the wireless communication terminal having the smallest sum of the required transmission delay times as a master; The wireless communication system according to claim 1, wherein:

According to the present invention, a wireless communication terminal that requests a large amount of communication that requires a low transmission delay time is set as a master, thereby shortening the transmission delay time of the communication of the wireless communication terminal and providing an optimal wireless data link. Is automatically and adaptively realized.

In the invention according to claim 4 of the present invention, the required communication quality is a required transmission delay time, and the role management means inputs the required transmission delay time notified from each of the wireless communication terminals. For each of the wireless communication terminals, determine the minimum value of the required transmission delay time of communication with the wireless communication terminal as an end point, determine the minimum wireless communication terminal having the minimum required transmission delay time as the master, The wireless communication system according to claim 1, wherein:

The present invention shortens the transmission delay time of the communication of the wireless communication terminal by setting the wireless communication terminal requesting the shortest transmission delay time as a master, and automatically creates a wireless communication system having an optimum wireless data link. It has an effect that it can be realized adaptively and adaptively.

[0024] The invention according to claim 5 of the present invention is characterized in that the required communication quality is at a first time in the future or at a first time in the future.
Is the required communication quality from the time of the second to the second time, wherein the role management unit inputs the required communication quality notified from each of the wireless communication terminals, and based on the required communication quality, At a time or during the period from the first time to the second time, a wireless communication terminal to be a master is determined, and at the first time or during the period from the first time to the second time The wireless communication system according to any one of claims 1 to 4, wherein a master instruction signal for instructing a wireless communication terminal to be a master is generated.

The present invention has the effect that when the required communication quality changes with time, a wireless communication system having an optimal wireless data link can be automatically and adaptively realized at each time.

According to a sixth aspect of the present invention, the communication quality determining means determines a required communication quality and a priority of the communication in communication between the wireless communication terminal and another wireless communication terminal. Determined, the communication quality notifying means notifies the request management quality determined by the communication quality determining means and the priority of the communication to the role management means, and the role management means notifies the role management means from each of the wireless communication terminals. Input the requested communication quality and the priority of the communication, determine the master wireless communication terminal based on the requested communication quality and the priority of the communication, and instruct the wireless communication terminal to be the master The wireless communication system according to any one of claims 1 to 5, wherein the wireless communication system generates a master instruction signal.

The present invention has an effect that, when the priorities of communication are not uniform, a wireless communication system having an optimum wireless data link in consideration of the importance can be realized automatically and adaptively.

According to a tenth aspect of the present invention, there are provided a plurality of wireless communication terminals, wherein one of the wireless communication terminals is a master and the other is a slave. Is a wireless communication system in which communication between slaves is possible and communication between slaves is relayed by a master, wherein at least one of the wireless communication terminals is a communication between the wireless communication terminal and another of the wireless communication terminals. A communication amount measuring unit for measuring the communication amount per unit time transmitted in, and one of the wireless communication terminals inputs the communication amount measured by the communication amount measuring terminal, and a master based on the communication amount. Wireless communication terminals
Role management means for generating a master instruction signal for instructing a wireless communication terminal to be a master;
The plurality of wireless communication terminals are provided with role changing means for receiving the master instruction signal and changing roles of a master and a slave according to the master instruction signal.

[0029] According to an eleventh aspect of the present invention, in the above-mentioned aspect, the role management means may include, for each of the wireless communication terminals, a unit time for transmission between the wireless communication terminal and another of the wireless communication terminals. 11. The wireless communication system according to claim 10, wherein a total sum of communication amounts per unit is calculated, and a wireless communication terminal having the largest total communication amount is determined as a master. 12.

The present invention has the effect of measuring traffic and automatically and adaptively realizing a wireless communication system having an optimal wireless data link according to the traffic.
Even when it is difficult to determine the communication characteristics and the required communication quality in the upper layer, the wireless communication system having the optimal wireless data link can be automatically and adaptively realized.

[0031] According to a twelfth aspect of the present invention, at least one of the wireless communication terminals includes the communication amount measuring means, the role managing means, and the role changing means. A wireless communication system according to claim 10 or claim 11.

According to the present invention, it becomes easy to transmit the information on the traffic from the traffic measuring means to the role managing means. The present invention has an effect that a wireless communication system having an optimal wireless data link according to the traffic can be realized automatically and adaptively. Preferably, the master includes the communication amount measurement unit, the role management unit, and the role change unit. Since all communications are performed via the master, the master can measure all traffic.

According to a thirteenth aspect of the present invention, the radio communication terminal serving as a master is provided with the role management means. It is a wireless communication system.

Since all communications are performed via the master, each wireless communication terminal can directly transmit the required communication quality to the role management means of the wireless communication terminal that becomes the master. The role management means of the master wireless communication terminal is:
The master can be changed by selecting a timing that does not hinder communication continuity. As described above, the procedure for changing the role by the role management unit is facilitated.

[0035] According to a fourteenth aspect of the present invention, the computer of the wireless communication terminal is connected to the first to ninth aspects.
14. A program for functioning as the communication quality determining means, the communication quality notifying means, the role changing means and the role managing means according to any one of claims 10 to 13, or any one of claims 10 to 13. A computer-readable recording medium on which a program for functioning as the communication amount measuring means, the role changing means, and the role managing means described in the section is recorded.

The present invention has an effect that the wireless communication system according to the above claims can be realized by loading the program recorded on the recording medium of the present invention into a computer of a wireless communication terminal.

[0037] According to a fifteenth aspect of the present invention, the computer of the wireless communication terminal is connected to the first to ninth aspects.
14. A program for functioning as the communication quality determining means, the communication quality notifying means, the role changing means and the role managing means according to any one of claims 10 to 13, or any one of claims 10 to 13. A program for functioning as the communication amount measuring means, the role changing means, and the role managing means described in the section.

The present invention has an effect that the above-mentioned wireless communication system can be realized by loading the program of the present invention into a computer of a wireless communication terminal.

[0039]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a preferred embodiment of the present invention. Embodiment 1 The configuration of a wireless communication system according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 shows the configuration of the wireless communication system according to the first embodiment of the present invention. The wireless communication system according to the first embodiment includes wireless communication terminals 100 to 104. The wireless communication terminal 101 includes a communication quality determining unit 105, a communication quality notifying unit 106, and a role changing unit 107. Each of the wireless communication terminals 102, 103, and 104 similarly includes a communication quality determining unit 105, a communication quality notifying unit 106, and a role changing unit 107. The wireless communication terminal 100 is a role management terminal including a communication quality determination unit 105, a communication quality notification unit 106, a role change unit 107, and a role management unit 108.

Next, the operation of the wireless communication system according to the first embodiment of the present invention will be described. The wireless communication system according to the first embodiment includes:
For example, they communicate with each other according to the Bluetooth protocol. First, an arbitrary wireless communication terminal (for example, 100) becomes a master, and the other wireless communication terminals 101 to 104 become slaves. A wireless data link 111 is formed between the master wireless communication terminal 100 and the other wireless communication terminals.

For example, the communication quality determination means 105 of the wireless communication terminal 101
A required communication quality 109 is determined between each of the upper layer 3 and the lower layer 104 in the communication of the upper layer of the Bluetooth protocol stack (in the embodiment, the communication of the IP layer). Specific items of the required communication quality 109 are arbitrary. For example, the required communication quality 109 is a communication speed. Required communication quality 109
May be different for each wireless communication terminal that performs communication, and may be constant for the wireless communication terminal regardless of the wireless communication terminal that performs communication. The determined required communication quality 109 is transmitted from the communication quality determining unit 105 to the communication quality notifying unit 106, and is notified to the role management unit 108 of the wireless communication terminal 100 by the communication quality notifying unit 106 of the wireless communication terminal 101.

Radio communication terminals 100, 102, 103, 1
04 communication quality determination means 105 (not shown).
Similarly, Blue with each other wireless communication terminal
The required communication quality 109 in the upper layer communication of the tooth protocol stack is determined. Determined required communication quality 1
09 is notified to the role management unit 108 of the wireless communication terminal 100 by the communication quality notification unit 106 of each wireless communication terminal. The role management unit 108 stores the required communication quality 109 of each wireless communication terminal.

Role management means 108 of wireless communication terminal 100
Are the wireless communication terminals 100, 101, 102, 103, 1
The master wireless communication terminal is determined based on the required communication quality 109 notified from the server 04. For example, the wireless communication terminal 10
2 is determined as the master wireless communication terminal, and the wireless communication terminal 1 is determined.
A master instruction signal 110 for instructing 02 to be a master is generated. The role management unit 108 of the wireless communication terminal 100 transmits the master instruction signal 110 to the role change unit 107 of the wireless communication terminal 100 that is the current master and the role change unit 107 of the wireless communication terminal 102 that is the new master. The role management unit 108 of the wireless communication terminal 100
7, the role changing unit 107 of the wireless communication terminal 102
May be transmitted to the master instruction signal 110.

Radio communication terminal 102 designated as master
The role changing means 107 executes the process of changing the role from the slave to the master according to the protocol of the wireless data link layer. The role changing unit 107 of the wireless communication terminal 100 that is no longer the master executes a role change process from the master to the slave according to the protocol of the wireless data link layer. Thereby, the wireless communication terminal 102 becomes a master, and the other wireless communication terminals 100, 101, 103, 104
Becomes a slave.

In this embodiment, a wireless communication system (wireless communication network) in which roles of a master and a slave are arranged so as to be suitable for providing required communication quality in communication in an upper layer of the Bluetooth protocol stack. Can be realized. By changing the master wireless communication terminal to a role management terminal (a wireless communication terminal having the role management means 108) (by changing the role management terminal to a new master wireless communication terminal when the master is changed, The role management terminal 100, which is the current master, can perform direct communication (transmission of the master instruction signal 110) with the wireless communication terminal 102 determined to be the master. As a result, the process of changing the role of the master / slave can be quickly executed according to the protocol of the wireless data link layer.

Embodiment 2 The configuration of a wireless communication system according to Embodiment 2 of the present invention will be described. The wireless communication system according to the second embodiment is a wireless communication system that further embodies the wireless communication system according to the first embodiment. The configuration of the wireless communication system according to the second embodiment is the same as the configuration of the wireless communication system according to the first embodiment illustrated in FIG.

For example, first, the wireless communication terminal 100 becomes a master, and the other wireless communication terminals 101 to 104 become slaves. A wireless data link 111 is formed between the master wireless communication terminal 100 and the other wireless communication terminals. The required communication quality 109 in the wireless communication system according to the first embodiment is the required transmission rate R (M, N) in the wireless communication system according to the second embodiment.

A specific operation of the wireless communication system according to the second embodiment of the present invention will be described. The role management unit 108 of the wireless communication terminal 100 determines the requested transmission speed (the minimum value of the transmission speed required for data transmission) between each wireless communication terminal and the other wireless communication terminals, which is notified from each of the wireless communication terminals 100 to 104. The wireless communication terminal receives and calculates the sum of the required transmission rates of data transmission with the respective wireless communication terminals as endpoints (start points or end points), and designates the wireless communication terminal having the largest sum of the required transmission rates as the master. decide.

Communication quality determining means 1 of wireless communication terminal 101
05 is another wireless communication terminal 100, 102, 103, 1
Transmission rate R (101, 10) in the upper layer communication of the Bluetooth protocol stack
0), R (101, 102), R (101, 103),
R (101, 104) is determined. Where R (M,
N) is the requested transmission speed in communication from the upper layer (the IP layer in the second embodiment) of the Bluetooth protocol stack of the wireless communication terminal M to the upper layer of the Bluetooth protocol stack of the wireless communication terminal N. For example, the requested transmission rate R
(101, 100) is 100 kbps.

Required transmission rates R (101, 100), R
(101, 102), R (101, 103), R (10
1, 104) is notified to the role management means 108 by the communication quality notification means 106. Wireless communication terminals 100, 10
Request transmission rates in communication between the upper layers of the Bluetooth protocol stacks 2, 103 and 104 and the upper layers of the other wireless communication means are also notified to the role management means 108 in the same manner. First, the role management unit 108 of the wireless communication terminal 100 sets each wireless communication terminal M as an end point (start point or end point) for each of the wireless communication terminals 100, 101, 102, 103, and 104 according to the following equation (1). Sum Sr (M) of required transmission rates R (M, N) for data transmission
Is calculated.

[0051]

(Equation 1)

The role management means 108 sets the radio communication terminals M having the larger sum Sr (M) as master candidates in order.
The role management unit 108 determines the wireless communication terminal (for example, 102) having the largest sum Sr (M) as the master, except for the wireless communication terminal that does not accept the role of the master. Hereinafter, similarly to the wireless communication system according to the first embodiment, the role changing unit 107 of the wireless communication terminal 100 that is no longer the master and the role of the wireless communication terminal 102 that is designated as the master execute the role change process of the master / slave. . Thereby, the wireless communication terminal 102 becomes a master, and the other wireless communication terminals 100, 101, 103, and 104 become slaves.

In this embodiment, master candidates are generated in consideration of the case where there is a wireless communication terminal that does not accept the role of master. However, in the case where all wireless communication terminals can accept the role of master, Is the sum S
It is possible to determine the wireless communication terminal M having the largest r (M) as the master. As described above, in the wireless communication system according to the second embodiment, the wireless communication terminal that requests the fastest transmission rate is set as the master.

For example, the sum Sr of the wireless communication terminal 101
(1) is the maximum, and the wireless communication terminals 101 to 102
Is assumed to have the fastest data transmission speed. In the conventional wireless communication system, if the wireless communication terminal 104 (total Sr
If the wireless communication terminal other than the wireless communication terminal 101 having the largest (M) becomes the master, the wireless communication terminal 101
02 is the master wireless communication terminal 10
4, data transmission from the wireless communication terminals 101 to 104 and transmission from the wireless communication terminals 104 to 1
02 is performed at the fastest transmission rate.
Therefore, two communication paths (from the wireless communication terminals 101 to 10)
4 and the wireless communication terminals 104 to 102
, The data is transmitted at the fastest transmission speed (the two communication paths are busy).

On the other hand, in the wireless communication system according to the second embodiment, the wireless communication terminal 101 having the maximum sum Sr (M) is automatically determined as the master. Data transmission from the wireless communication terminals 101 to 102 is performed by directly transmitting data from the master wireless communication terminal 101 to the wireless communication terminal 102 at the highest transmission rate. Therefore, data is transmitted at the fastest transmission speed only in one communication path (communication path from the wireless communication terminals 101 to 102) (one communication path is busy).

The wireless communication system of the present invention can reduce the data transmission amount of the entire wireless communication system as compared with the conventional wireless communication system. The wireless communication system of the present invention can automatically configure a wireless communication system that is most suited to a traffic pattern required between wireless communication terminals as a whole, and reduce the amount of traffic relayed by the master.

Embodiment 3 The configuration of a wireless communication system according to Embodiment 3 of the present invention will be described. The wireless communication system according to the third embodiment is a wireless communication system that further embodies the wireless communication system according to the first embodiment. The configuration of the wireless communication system according to the third embodiment is the same as the configuration of the wireless communication system according to the first embodiment illustrated in FIG.

For example, first, the wireless communication terminal 100 becomes a master, and the other wireless communication terminals 101 to 104 become slaves. A wireless data link 111 is formed between the master wireless communication terminal 100 and the other wireless communication terminals. The required communication quality 109 in the wireless communication system according to the first embodiment is the required transmission delay time D (M, N) in the wireless communication system according to the third embodiment.

A specific operation of the wireless communication system according to the third embodiment of the present invention will be described. The role management unit 108 of the wireless communication terminal 100 receives the requested transmission delay time (for example, the maximum allowable delay time) between each wireless communication terminal and the other wireless communication terminals notified from each of the wireless communication terminals 100 to 104. Then, for each wireless communication terminal, the sum of required transmission delay times of data transmission with the respective wireless communication terminals as endpoints (start points or end points) is calculated, and the wireless communication terminals having the smallest sum of the required transmission delay times are calculated in order. Master candidate.

Communication quality determining means 1 of wireless communication terminal 101
Reference numeral 05 denotes a required transmission delay time in communication between the upper layer (the IP layer in the third embodiment) of the Bluetooth protocol stack of the wireless communication terminal 101 and the upper layers of the other wireless communication terminals 100, 102, 103, and 104, respectively. D (10
1,100), D (101,102), D (101,1)
03), D (101, 104) is determined. D (M,
N) is a request transmission delay time in communication from the upper layer of the Bluetooth protocol stack of the wireless communication terminal M to the upper layer of the Bluetooth protocol stack of the wireless communication terminal N. For example, the required transmission delay time D (101, 100) is 3 ms.

Request transmission delay time D (101, 100),
D (101, 102), D (101, 103), D (1
01, 104) is notified to the role management means 108 by the communication quality notification means 106. Wireless communication terminals 100, 10
The request transmission delay time in the communication between the upper layers of the Bluetooth protocol stacks 2, 103, and 104 and the upper layers of the other wireless communication means is also notified to the role management means 108, respectively. First, the role management unit 108 of the wireless communication terminal 100 sets each wireless communication terminal M as an end point (start point or end point) for each of the wireless communication terminals 100, 101, 102, 103, and 104 according to the following equation (2). Sum S of required transmission delay time D (M, N) for data transmission
Calculate d (M).

[0062]

(Equation 2)

The role management means 108 sets the wireless communication terminals M having the smaller sum Sd (M) as master candidates in order.
The role management unit 108 determines the wireless communication terminal (for example, 102) having the smallest sum Sd (M) as the master, except for the wireless communication terminal that does not accept the role of the master. Hereinafter, similarly to the wireless communication system according to the first embodiment, the role changing unit 107 of the wireless communication terminal 100 that is no longer the master and the role of the wireless communication terminal 102 that is designated as the master execute the role change process of the master / slave. . Thereby, the wireless communication terminal 102 becomes a master, and the other wireless communication terminals 100, 101, 103, and 104 become slaves.

In another embodiment, the minimum value MINd (M) of the required transmission delay time D (M, N) of the communication with the wireless communication terminal M as the end point is obtained, and the minimum value MINd (M) is small. Masters are assumed to be master candidates in order from the wireless communication terminal M.
The role management unit 108 determines a wireless communication terminal (for example, 102) having the smallest minimum value MINd (M) as a master, except for a wireless communication terminal that does not accept the role of the master.

In this embodiment, master candidates are generated in consideration of the case where there is a wireless communication terminal that does not accept the role of master. However, in the case where all wireless communication terminals can accept the role of master, Is the sum S
It is possible to determine the wireless communication terminal M with the smallest d (M) as the master. As described above, in the wireless communication system according to the third embodiment, the wireless communication terminal that requests the shortest transmission delay time is set as the master.

For example, the sum Sd (1
01) is the smallest, and the wireless communication terminals 101 to 102
It is assumed that the required transmission delay time of data to the server is shortest. In the conventional wireless communication system, if the wireless communication terminal 104
If (the wireless communication terminal other than the wireless communication terminal 101 having the smallest sum Sd (M)) becomes the master, the wireless communication terminal 1
Since the data transmission from 01 to 102 is performed via the wireless communication terminal 104 which is the master, the data transmission from the wireless communication terminals 101 to 104 and the wireless communication terminal 1
Data transmission from 04 to 102 is performed. Therefore,
The transmission delay time of the data transmission from the wireless communication terminals 101 to 102 is two communication paths (one from the wireless communication terminals 101 to 102).
04, and from the wireless communication terminal 104 to 10
2 is added.

On the other hand, in the wireless communication system according to the third embodiment, the wireless communication terminal 101 having the minimum sum Sd (M) is determined as the master. Wireless communication terminal 101
Is transmitted by directly transmitting data from the master wireless communication terminal 101 to the wireless communication terminal 102. Therefore, the wireless communication terminal 10
The transmission delay time of data transmission from 1 to 102 is only the delay time of one communication path (the communication path from the wireless communication terminals 101 to 102).

In the wireless communication system of the present invention, data having a short required transmission delay time is directly transmitted through one communication path. The wireless communication system of the present invention automatically configures a wireless communication system that is most suitable as a whole to the traffic pattern required between the wireless communication terminals, and requests many communications that require a low transmission delay time. Let the wireless communication terminal be the master.

Embodiment 4 The configuration of a wireless communication system according to Embodiment 4 of the present invention will be described. The wireless communication system according to the fourth embodiment is a wireless communication system that further embodies the wireless communication system according to the first embodiment. The configuration of the wireless communication system according to the fourth embodiment is the same as the configuration of the wireless communication system according to the first embodiment illustrated in FIG.

For example, first, the wireless communication terminal 100 becomes the master, and the other wireless communication terminals 101 to 104 become the slaves. A wireless data link 111 is formed between the master wireless communication terminal 100 and the other wireless communication terminals. In the wireless communication system of the fourth embodiment, the required communication quality of the wireless communication system of the first embodiment is
This is the requested transmission speed between the upper layer of the oth protocol stack (the IP layer in the fourth embodiment) and the upper layer of another wireless communication terminal.

A specific operation of the wireless communication system according to the fourth embodiment of the present invention will be described. Each wireless communication terminal is an upper layer of the Bluetooth protocol stack of each wireless communication terminal (Example 4).
, The required transmission rate of data communication between the upper layer of the other wireless communication terminal and a certain time t in the future. The role management unit 108 of the wireless communication terminal 100 transmits the Blue wireless signals of the two wireless communication terminals at a certain time t in the future notified from each of the wireless communication terminals 100 to 104.
Request transmission speed of data communication between upper layers of the tooth protocol stack is received, and request transmission of data communication at a certain time t in the future with each wireless communication terminal as an end point (start point or end point) for each wireless communication terminal The sum of the rates is calculated, and the wireless communication terminals having the largest sum of the requested transmission rates are set as master candidates in order.

Communication quality determining means 1 of wireless communication terminal 101
05 is the upper layer of the Bluetooth protocol stack of the wireless communication terminal 101 and the other wireless communication terminals 100, 102, 1
03, 104 The requested transmission rate R (t, 101, 10) of the communication with the upper layer at a certain time t in the future.
0), R (t, 101, 102), R (t, 101, 1)
03) and R (t, 101, 104) are determined. R
(T, M, N) indicates the Bluetooth of the wireless communication terminal N from the upper layer of the Bluetooth protocol stack of the wireless communication terminal M.
This is the required transmission rate of communication to the upper layer of the protocol stack at a certain time t in the future. For example, the requested transmission rate R
(T, 101, 100) is 3 ms.

Request transmission rate R (t, 101, 100),
R (t, 101, 102), R (t, 101, 10
3), R (t, 101, 104) are communication quality notification means 1
06, the role management unit 108 of the wireless communication terminal 100 is notified. Wireless communication terminals 100, 102, 103, 1
Time t between the upper layer of the Bluetooth protocol stack 04 and the upper layer of each of the other wireless communication means.
Are also notified to the role management means 108 in the same manner. First, the role management unit 108 of the wireless communication terminal 100 sets each wireless communication terminal M as an end point (start point or end point) for each of the wireless communication terminals 100, 101, 102, 103, and 104 according to the following equation (3). Required transmission rate R of data transmission at a certain time t in the future
The sum Sr (t, M) of (t, M, N) is calculated.

[0074]

(Equation 3)

The role management means 108 calculates the time t
, The wireless communication terminals M having the larger sum Sr (t, M) are sequentially set as master candidates at the time t. The role management unit 108 removes the sum Sr at a certain time t in the future, except for wireless communication terminals that do not accept the role of master.
Wireless communication terminal having the largest (t, M) (for example, 102)
Is determined as the master at the time t. Hereinafter, similarly to the wireless communication system according to the first embodiment, at a certain time t in the future, the wireless communication terminal 100 that is no longer the master will be described.
The role changing unit 107 of the wireless communication terminal 102 designated as the master performs the process of changing the role of the master / slave. Thereby, the wireless communication terminal 102 becomes a master, and the other wireless communication terminals 100, 101, 103,
104 becomes a slave.

In the present embodiment, master candidates are generated in consideration of the case where there is a wireless communication terminal that does not accept the role of master. However, in the case where all wireless communication terminals can accept the role of master, Can determine the wireless communication terminal M having the maximum sum Sr (t, M) at a certain time t in the future as the master. As described above, in the wireless communication system according to the fourth embodiment, at a certain time t, the wireless communication terminal requesting the highest transmission rate is set as the master.

For example, when the sum Sr (t, 101) of the wireless communication terminal 101 at a future time t is the maximum,
It is assumed that the requested transmission speed of data from the wireless communication terminals 101 to 102 is the highest. In the wireless communication system according to the fourth embodiment, the sum Sr (t,
The wireless communication terminal 101 with the largest M) is determined as the master at the time t. At the time t, data transmission from the wireless communication terminals 101 to 102 is executed by directly transmitting data from the wireless communication terminal 101, which is the master, to the wireless communication terminal 102. Therefore, at that time t, one communication path (wireless communication terminal 101)
, The data is transmitted at the fastest transmission speed only (one communication path becomes busy).

The wireless communication system of the present invention can reduce the data transmission amount of the entire wireless communication system by adapting to a situation that changes according to time. The wireless communication system according to the present invention is capable of controlling the traffic required between the wireless communication terminals even when the communication quality required for data communication between the upper layers of the Bluetooth protocol stack of the wireless communication terminal changes with time. It is possible to automatically configure a wireless communication system that is most adapted to the pattern as a whole at each time and reduce the amount of traffic relayed by the master. It should be noted that the requested transmission speed notified to the role management means may not be the requested transmission speed at a certain future time, but may be the requested transmission speed from a certain future time to a certain time.

Embodiment 5 The configuration of a wireless communication system according to Embodiment 5 of the present invention will be described with reference to FIGS. FIG.
Shows the configuration of the wireless communication system according to the fifth embodiment of the present invention.
The wireless communication system according to the fifth embodiment includes wireless communication terminals 200 to
204.

Radio communication terminal 201 has communication quality determining means 205, communication quality notifying means 206, and role changing means 207.
And Each of the wireless communication terminals 202, 203, and 204 also includes a communication quality determining unit 205, a communication quality notifying unit 206, and a role changing unit 207, respectively. The wireless communication terminal 200 includes a communication quality determination unit 205, a communication quality notification unit 206, a role change unit 207, and a role management unit 20.
8 is a role management terminal including The hardware configuration of the wireless communication system according to the fifth embodiment illustrated in FIG. 2 is the same as the hardware configuration of the wireless communication system according to the first embodiment illustrated in FIG.

For example, first, the wireless communication terminal 200 becomes the master, and the other wireless communication terminals 201 to 204 become the slaves. A wireless data link 211 is formed between the wireless communication terminal 200 as the master and the other wireless communication terminals. Each wireless communication terminal 200 according to the fifth embodiment
To 204 transmit the priority coefficient information to the role management unit 208 in addition to the required communication quality information shown in the first embodiment.

FIG. 3 is a table of priority coefficients according to the fifth embodiment of the present invention. In the priority coefficient table of FIG. 3, the wireless data links (200, 201) and the like between the wireless communication terminals are classified into A, B, C, and D priority classes according to the priority. The priority class A is the class with the highest priority, and the priority becomes lower in the order of B, C, and D below.

For example, the wireless data link (202, 20)
0) means a communication path for transmitting data from the wireless communication terminal 202 to the wireless communication terminal 200. The value of the priority coefficient P corresponding to each priority class is 1, 0.8, 0.5, 0.
3 are defined. The priority coefficient P satisfies 0 <P <1 in the fifth embodiment, but is an appropriately determined constant. Generally, a large P value is assigned to a class with a high priority, and a small P value is assigned to a class with a low priority.

Next, the operation of the wireless communication system according to the fifth embodiment of the present invention will be described. The wireless communication system according to the fifth embodiment includes:
For example, they communicate with each other according to the Bluetooth protocol. For example, the communication quality determining means 20 of the wireless communication terminal 201
5 is the upper layer of the Bluetooth protocol stack of the wireless communication terminal 201 and the other wireless communication terminals 200, 202, 20
3 and 204, the required communication quality and the priority 209 in the communication with the upper layer. Specific items of the required communication quality are arbitrary.

In the fifth embodiment, the required communication quality is the communication speed, and the communication quality determining means 20 of the wireless communication terminal 201
5 is another wireless communication terminal 200, 202, 203, 20
4 required transmission rate R (2
01, 200), R (201, 202), R (201,
203), R (201, 204), and respective communication priorities P (201, 200), P (201, 202),
P (201, 203) and P (201, 204) are determined.

R (M, N) is the Blueto of the wireless communication terminal M.
This is a requested transmission speed in communication from an upper layer of the oth protocol stack to an upper layer of the wireless communication terminal N. P (M,
N) is the priority (a priority class (any one of A to D) to which the communication belongs) of communication from the upper layer of the Bluetooth protocol stack of the wireless communication terminal M to the upper layer of the wireless communication terminal N. As described above, the required communication quality R and the priority P may be different values for each wireless data link between the wireless communication terminal and another wireless communication terminal (the required communication quality R and the priority P for each wireless data link). P is determined.) Alternatively, it may be a fixed value that depends on the wireless communication terminal and does not depend on the wireless communication terminal of the communication partner (the required communication quality R and the priority P are determined for each wireless communication terminal). Is done.)

The determined required transmission rate R (201, 20)
0), R (201, 202), R (201, 203),
R (201, 204) and priority P (201, 20)
0), P (201, 202), P (201, 203),
P (201, 204) is notified to the role management unit 208 of the wireless communication terminal 200 by the communication quality notification unit 206 of the wireless communication terminal 201.

Radio communication terminals 200, 202, 203, 2
Similarly, each communication quality determination means 205 of 04 determines the required communication quality and priority in communication between the upper layer of the Bluetooth protocol stack of the wireless communication terminal and the upper layers of the other wireless communication terminals. The determined required communication quality and priority 209 are notified to the role management means 208 of the wireless communication terminal 200 by the communication quality notification means 206 of each wireless communication terminal. The role management unit 208 stores the required communication quality and priority 209 of each wireless communication terminal.

Role management means 208 of radio communication terminal 200
First, the wireless communication terminals 200, 201, 202, 20
3, 204, the priority P (M,
N) are classified into priority classes A to D shown in FIG. P
(M, N) is a priority class to which communication from the upper layer of the Bluetooth protocol stack of the wireless communication terminal M to the upper layer of the wireless communication terminal N belongs.
B, C or D.

The role management means 208 stores the priority coefficient P of the priority class to which each wireless data link (M, N) belongs.
Read (M, N). The read priority coefficient is Q
Expressed by (M, N). Q (M, N) is the wireless communication terminal M
It is a priority coefficient of communication from the upper layer of the Bluetooth protocol stack to the upper layer of the wireless communication terminal N, and is 1, 0.8, 0.5 or 0.3 as shown in FIG.
Takes one of the following values. Next, the role management unit 208
The wireless communication terminals 200, 201, 202,
The requested transmission rate R (M,
N) is multiplied by a priority coefficient Q (M, N) to calculate a required weighted transmission rate R (M, N) × Q (M, N) for each wireless data link (M, N), and for each wireless communication For each terminal, the sum Sr (M) of the required weighted transmission rates at which the wireless communication terminal M is the end point (start point or end point) (M = 200, 201, 202, 2
03 or 204).

[0091]

(Equation 4)

Next, role management means 2 of radio communication terminal 200
08 is a master candidate in order from the wireless communication terminal M in which the total sum Sr (M) of the required weighted transmission rates is large. A wireless communication terminal having the largest sum of required weighted transmission rates Sr (M) among wireless communication terminals that can be the master is determined as a new master wireless communication terminal. For example, the wireless communication terminal 202 is determined as a new master wireless communication terminal. The role management unit 208 of the wireless communication terminal 200 sends the master instruction signal 210 for instructing the wireless communication terminal 201 to be the master to the role change unit 207 of the wireless communication terminal 200 that is the current master and the wireless communication terminal that is the new master. The information is transmitted to the role changing unit 207 of the terminal 201.

Radio communication terminal 200 that is no longer the master
The role changing unit 207 of the wireless communication terminal 202 designated as the master performs a process of changing the role of the master / slave. Thereby, the wireless communication terminal 202 becomes a master, and the other wireless communication terminals 200, 202, 203,
204 becomes a slave.

In this embodiment, even when the priority of communication between the upper layers of the Bluetooth protocol stack is not uniform, the communication quality required in the communication between the upper layers of the Bluetooth protocol stack is taken into account in consideration of the priority. The wireless communication system (wireless communication network) in which the roles of the master and the slave are arranged so as to be suitable for providing the communication. By making the master wireless communication terminal a role management terminal (a wireless communication terminal having role management means 208) (if the master is changed, the role management terminal is replaced by a new master wireless communication terminal) ), Role management terminal 200 which is the current master
Can perform direct communication (transmission of the master instruction signal 110) with the wireless communication terminal 202 determined to be the master. As a result, the process of changing the role of the master / slave can be quickly executed according to the protocol of the wireless data link layer.

In the present embodiment, the priorities are classified into the priority classes and the priority coefficients are obtained by using the priority coefficient table (FIG. 3). However, the present invention is not limited to this. It is also possible to use a function that uses a coefficient as a value.

Embodiment 6 The configuration of a wireless communication system according to Embodiment 6 of the present invention will be described with reference to FIG. FIG. 4 shows a configuration of a wireless communication system according to a sixth embodiment of the present invention. The wireless communication system according to the sixth embodiment includes a wireless communication terminal 40
0 to 404.

Reference numerals 400 to 404 denote wireless communication terminals.
The wireless communication terminals communicate with each other via a master wireless terminal defined according to the Bluetooth protocol. The wireless communication terminal 400 includes an RF layer and an LC layer 409, an LM layer 413, an L2CAP layer and an RFCOMM layer 410, a PP
The role management terminal includes a Bluetooth protocol stack including a P layer 411 and an IP layer 412, a traffic measurement unit 405, and a role management unit 406.

Radio communication terminals 401, 402, 403, 4
04 are the RF layer and the LC layer 409, the LM layer 413, the L2CAP layer and the R
FCOMM layer 410, PPP layer 411 and IP layer 41
2 is provided with a Bluetooth protocol stack including the communication protocol No. 2, a traffic measuring unit 405, and a role managing unit 406. For example, the wireless communication terminal 400 is currently a master in Bluetooth, and is a communication volume measurement terminal and a role management terminal. Other wireless communication terminals 400 to 403 are slaves. The wireless data link 41 between the master wireless communication terminal 400 and the other wireless communication terminals, respectively.
4 are formed.

An operation of the wireless communication system according to the sixth embodiment of the present invention will be described. The wireless communication system according to the sixth embodiment
They communicate with each other according to the oth protocol. The communication amount measuring unit 405 of the wireless communication terminal 400, which is the master, measures the communication amount of the upper layer of the Bluetooth protocol stack between the wireless communication terminal 400 and each of the other wireless communication terminals.

In the sixth embodiment, the wireless communication terminal 400
The traffic measurement unit 404 monitors the traffic processed by the IP layer 412, and thereby monitors the Bl of each wireless communication terminal.
Traffic T per unit time transmitted between upper layers (IP layer in the sixth embodiment) of the uetooth protocol stack
Measure (M, N). T (M, N) is the traffic per unit time from the upper layer of the Bluetooth protocol stack of the wireless communication terminal M to the upper layer of the wireless communication terminal N.
In the Bluetooth protocol, all communication data passes through the wireless communication terminal 400 as the master, so that the communication amount measuring unit 405 can measure the communication amount of all communication.

The traffic T (M, N) measured by the traffic measuring means 405 is transmitted to the role managing means 406 of the same wireless communication terminal 400. The role management unit 406 adds, for each wireless communication terminal, a communication amount T (M, N) having each wireless communication terminal M as an end point (a start point or an end point) per unit time according to Expression (5), and The total sum St (M) of the communication amount having M as an end point is obtained. Role management means 406
The wireless communication terminal M stores the total sum St (M) of the communication amount serving as an end point.

[0102]

(Equation 5)

Role management means 406 of radio communication terminal 400
Are master candidates in order from the wireless communication terminal M having the largest sum St (M). The wireless communication terminal having the largest sum St (M) among the wireless communication terminals that can be masters is determined as a new master. For example, the wireless communication terminal 401 is determined as a new master. Role management means 40
6 generates a master instruction signal 408 for instructing the wireless communication terminal 401 to be a new master. The role management unit 406 of the wireless communication terminal 400 sends the master instruction signal 408 to the role changing unit L of the wireless communication terminal 400.
The data is transmitted to the M layer 413.

The LM layer 413 of the wireless communication terminal 400
The master instruction signal 408 is transmitted to the LM layer 413 of the wireless communication terminal 401 as a new master in accordance with the link management protocol in uetooth. The LM layer 413, which is the role changing unit of the wireless communication terminal 400 that is no longer the master and the wireless communication terminal 401 designated as the master, executes the process of changing the role of the master / slave. Thereby, the wireless communication terminal 401 becomes a master, and the other wireless communication terminals 400, 402, 403, and 404 become slaves. As described above, the process of changing the role of the master is executed.

When the role change processing is completed, the radio communication terminal 4
When 01 becomes the master, the communication amount measurement unit 405 and the role management unit 406 in the wireless communication terminal 401 function, and the wireless communication terminal 401 becomes the communication amount measurement terminal and the role management terminal. It is effective to consider the time Tsw required for the role change processing and to cause the next role change processing to occur after a sufficiently long time has elapsed compared to Tsw. The present embodiment is suitable for communication performed between the upper layers of the Bluetooth protocol stack of the wireless communication terminal even when it is difficult to determine the characteristics of the communication and the required communication quality between the upper layers of the Bluetooth protocol stack of the wireless communication terminal. Wireless communication system (wireless communication network).

In the sixth embodiment, the Bluetooth protocol includes the PPP layer and the IP layer as upper layers of the L2CAP layer and the RFCOMM layer. Instead,
The Bluetooth protocol is used, for example, on top of the L2CAP layer
The present invention can be similarly applied to a case where a protocol stack configuration different from that of the sixth embodiment, such as a configuration in which a P layer is present or a configuration in which an IPX layer is present on a PPP layer, is used. Although the wireless communication system of the sixth embodiment has a configuration in which communication data is relayed in the IP layer of the master wireless communication terminal, a configuration in which communication data is relayed by a higher-level application may be used instead. It is possible.

The above-described embodiments 1 to 6 have a configuration including a wireless data link layer according to the Bluetooth protocol. However, the present invention is not limited to this, and the present invention can specify any wireless communication terminal as a master (some wireless communication terminals that cannot be the master can be excluded). Applicable to communication systems.

A program for causing the computer of the wireless communication terminal to function as the communication quality determining means, communication quality notifying means, role changing means and role managing means according to any one of the first to fifth embodiments is recorded. By loading the computer-readable recording medium into the computer of the wireless communication terminal, the wireless communication system according to any one of the first to fifth embodiments can be realized. This is because the main part of the functions of the above means can be realized by a computer.

A program for causing a computer of a wireless communication terminal to function as a communication quality determining means, a communication quality notifying means, a role changing means, and a role managing means according to any one of the first to fifth embodiments, The wireless communication system according to any one of the first to fifth embodiments can be realized by loading the data into the computer of the wireless communication terminal.

A computer-readable recording medium storing a program for causing the computer of the wireless communication terminal to function as the communication amount measuring means, the role changing means, and the role managing means described in the sixth embodiment is stored in the computer of the wireless communication terminal. , The wireless communication system according to the sixth embodiment can be realized. This is because the main part of the functions of the above means can be realized by a computer.

The program for causing the computer of the wireless communication terminal to function as the communication amount measuring means, the role changing means and the role managing means described in the sixth embodiment is loaded on the computer of the wireless communication terminal. Can be realized.

[0112]

According to the present invention, a wireless communication terminal having an optimum wireless data link can be automatically and adaptively realized by determining a master wireless communication terminal based on required communication quality. The advantageous effect described above can be obtained. According to the present invention, a wireless communication system having an optimum wireless data link is automatically determined by determining a master wireless communication terminal based on required communication quality in communication between upper layers of a protocol stack of a wireless communication terminal. And an adaptive effect can be obtained.

According to the present invention, the amount of traffic relayed by the master is reduced by using the wireless communication terminal requiring a large transmission capacity as the master, and the wireless communication system having the optimum wireless data link is automatically and automatically provided. An advantageous effect can be obtained if it can be realized adaptively.

According to the present invention, the wireless communication terminal that requests a large amount of communication that requires a low transmission delay time is set as the master, so that the transmission delay time of the communication of the wireless communication terminal is shortened, and the optimum wireless communication terminal is transmitted. An advantageous effect is obtained that a wireless communication system having a data link can be realized automatically and adaptively. According to the present invention, the wireless communication terminal requesting the shortest transmission delay time is set as the master, thereby shortening the transmission delay time of the communication of the wireless communication terminal and automatically setting the wireless communication system having the optimum wireless data link. And an adaptive effect can be obtained.

According to the present invention, it is possible to automatically and adaptively realize a wireless communication system having an optimal wireless data link at each future time when the required communication quality changes with time. An advantageous effect is obtained.

According to the present invention, when communication priorities are not uniform, there is an advantageous effect that a wireless communication system having an optimum wireless data link considering the importance can be automatically and adaptively realized. can get.

According to the present invention, an advantageous effect is obtained in that a communication amount is measured, and a wireless communication system having an optimum wireless data link according to the communication amount can be automatically and adaptively realized. ADVANTAGE OF THE INVENTION According to this invention, the advantageous effect that the radio | wireless communications system which has the optimal radio | wireless data link according to the traffic can be realized automatically and adaptively.

According to the present invention, by loading the program recorded on the recording medium of the present invention into a computer of a wireless communication terminal, the above-described wireless communication system can be advantageously achieved. According to the present invention, the advantageous effect that the above-described wireless communication system can be realized by loading the program of the present invention into the computer of the wireless communication terminal is obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a wireless communication system according to a first embodiment of the present invention;

FIG. 2 is a configuration diagram of a wireless communication system according to a fifth embodiment of the present invention.

FIG. 3 is a configuration diagram of a priority coefficient table according to a fifth embodiment of the present invention.

FIG. 4 is a configuration diagram of a wireless communication system according to a sixth embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional wireless communication system.

[Explanation of symbols]

100, 101, 102, 103, 104, 200, 1
02, 202, 203, 204, 400, 401, 40
2,403,404,500,501,502,50
3, 504 wireless communication terminal 105, 205 communication quality determination means 106, 206 communication quality notification means 107, 207 role change means 108, 208, 406 role management means 109 required communication quality 110, 210, 408 master instruction signal 111, 211, 414 Wireless data link 209 Required communication quality and priority 405 Communication amount measuring means 407, 510 IP packet 409 RF layer and L of Bluetooth protocol stack
C layer 410, 506 Bluetooth protocol stack L2
CAP layer and RFCOMM layer 411, 507 PP of Bluetooth protocol stack
P layer 412, 508 IP of Bluetooth protocol stack
Layer 413 LM layer of Bluetooth protocol stack 505 RF layer of Bluetooth protocol stack, LC
Layer and LM layer

Continued on the front page F-term (reference) 5K033 BA08 DA01 DA19 5K034 EE03 HH01 HH02 HH06 MM05 5K067 AA12 AA14 AA23 CC10 DD43 DD45 EE06 EE25 EE35 FF05 GG06 HH21 5K072 AA15 AA23 BB02 BB13 BB25

Claims (15)

[Claims] 1. A wireless communication terminal comprising: a plurality of wireless communication terminals; one of the wireless communication terminals is a master and the other is a slave; in a wireless data link layer, only communication between the master and the slave is possible; The communication is a wireless communication system relayed by a master, wherein the wireless communication terminal includes: a communication quality determining unit that determines a required communication quality in communication between the wireless communication terminal and another wireless communication terminal; A communication quality notifying unit for notifying the role management unit of the required communication quality determined by the communication quality determining unit; and a master instruction signal for instructing a master wireless communication terminal transmitted from the role management unit, Role changing means for changing the roles of a master and a slave in accordance with an instruction signal; and at least one of the wireless communication terminals Further comprises the role management means for inputting the required communication quality notified from each of the wireless communication terminals, determining a master wireless communication terminal based on the required communication quality, and generating the master instruction signal. A wireless communication system, characterized by: 2. The requested communication quality is a requested transmission rate, and the role management means inputs the requested transmission rate notified from each of the wireless communication terminals, and The wireless communication system according to claim 1, further comprising: calculating a sum of the requested transmission speeds of the communication having the terminal as an end point, and determining a wireless communication terminal having the largest sum of the requested transmission speeds as a master. 3. The requested communication quality is a requested transmission delay time, and the role management unit inputs the requested transmission delay time notified from each of the wireless communication terminals, and The wireless communication terminal according to claim 1, wherein the sum of the required transmission delay times of the communication having the wireless communication terminal as an end point is calculated, and a wireless communication terminal having the smallest total required transmission delay time is determined as a master. Wireless communication system. 4. The requested communication quality is a requested transmission delay time, and the role management means inputs the requested transmission delay time notified from each of the wireless communication terminals, and The minimum value of the required transmission delay time of communication having a wireless communication terminal as an end point is determined, and a wireless communication terminal having the minimum required transmission delay time is determined as a master. Wireless communication system. 5. The wireless communication terminal according to claim 1, wherein the required communication quality is a required communication quality at a first time in the future or between a first time and a second time in the future. Inputting the required communication quality notified from, and determining a master wireless communication terminal at the first time or between the first time and the second time based on the required communication quality, The method according to claim 1, wherein a master instruction signal for instructing a wireless communication terminal to be a master is generated at the first time or between the first time and the second time. The wireless communication system according to claim 1. 6. The communication quality determining unit determines a required communication quality in communication between the wireless communication terminal and another wireless communication terminal and a priority of the communication, and the communication quality notifying unit includes: Notifying the required communication quality determined by the communication quality determining means and the priority of the communication to the role management means, the role management means, the requested communication quality notified from each of the wireless communication terminals and the communication of the communication Inputting a priority, determining a master wireless communication terminal based on the requested communication quality and the priority of the communication, and generating the master instruction signal indicating the wireless communication terminal to be a master. The wireless communication system according to any one of claims 1 to 5, wherein 7. The requested communication quality is a requested transmission speed, and the role management means inputs the requested transmission speed notified from each of the wireless communication terminals and the priority of the communication, and For each terminal, calculate the sum of the required weighted transmission rates, which is a value obtained by multiplying the required transmission rate of the communication having the wireless communication terminal as an endpoint by a coefficient determined by the priority of the communication, and sum the required weighted transmission rates The wireless communication system according to claim 6, wherein a wireless communication terminal having the largest value is determined as a master, and the master instruction signal indicating the wireless communication terminal to be the master is generated. 8. The requested communication quality is a requested transmission delay time, and the role management means inputs the requested transmission delay time notified from each of the wireless communication terminals and the priority of the communication, and For each wireless communication terminal, calculate the sum of required weighted transmission delay times, which is a value obtained by multiplying the required transmission delay time of the communication having the wireless communication terminal as an endpoint by a coefficient determined by the priority of the communication, The wireless communication system according to claim 6, wherein the wireless communication terminal having the smallest sum of the transmission delay times is determined as a master, and the master instruction signal indicating the wireless communication terminal to be the master is generated. 9. The requested communication quality is a requested transmission delay time, and the role management unit inputs the requested transmission delay time notified from each of the wireless communication terminals and the priority of the communication, and For each wireless communication terminal, determine the minimum value of the request weighted transmission delay time, which is a value obtained by multiplying the required transmission delay time of the communication having the wireless communication terminal as an end point by a coefficient determined by the priority of the communication, The wireless communication system according to claim 6, wherein a wireless communication terminal having a minimum transmission delay time is determined as a master, and the master instruction signal that designates a wireless communication terminal to be a master is generated. 10. A wireless communication terminal having a plurality of wireless communication terminals, wherein one of the wireless communication terminals is a master and the other is a slave. In the wireless data link layer, only communication between the master and the slave is possible, and The communication is a wireless communication system relayed by a master, wherein at least one of the wireless communication terminals is a communication amount per unit time transmitted in communication between the wireless communication terminal and another of the wireless communication terminals. A communication traffic measuring unit that measures the traffic, one of the wireless communication terminals inputs the traffic measured by the traffic measurement terminal, determines a wireless communication terminal to be a master based on the communication traffic, Role management means for generating a master instruction signal for instructing the wireless communication terminal, the at least one wireless communication terminal comprising: Wireless communication system type, comprising a role changing means for changing the roles of master and slave according to the master command signal, characterized in that the. 11. The role management means calculates, for each of the wireless communication terminals, a sum of communication amounts per unit time transmitted between the wireless communication terminal and another one of the wireless communication terminals, The wireless communication system according to claim 10, wherein the wireless communication terminal having the largest sum of the communication amounts is determined as a master. 12. The wireless communication according to claim 10, wherein at least one of the wireless communication terminals includes the communication amount measurement unit, the role management unit, and the role change unit. system. 13. The wireless communication system according to claim 1, wherein a master wireless communication terminal includes the role management unit. 14. The computer of the wireless communication terminal,
A program for functioning as the communication quality determining means, the communication quality notifying means, the role changing means and the role managing means according to any one of claims 1 to 9, or a program for functioning as the role managing means. 14. A computer-readable recording medium storing a program for functioning as the communication amount measurement unit, the role change unit, and the role management unit according to claim 13. 15. The computer of the wireless communication terminal,
A program for functioning as the communication quality determining means, the communication quality notifying means, the role changing means and the role managing means according to any one of claims 1 to 9, or a program for functioning as the role managing means. 14. A program for functioning as the traffic measuring unit, the role changing unit, and the role managing unit according to claim 13.