JP2000069040A - Radio channel access control method and radio transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio channel access control method capable of efficiently transmitting various signals from a lot of users even when there is the change of traffic characteristics such as the traffic density fluctuation of each user or traffic volume fluctuation of whole system in the access control method in the case of performing packet communication between radio stations. SOLUTION: Plural radio stations are mutually connected by a radio channel to be shared for the respective radio stations and transmission data from every radio equipment are transmitted while being divided into the group of unspecified size called packet. In such a radio packet communication system, transmission equipment 2 of each ratio station is provided with a transmission buffer 22 for storing transmission packets and a function capable of selecting plural methods as an access method in the case of transmission. Then, the features of conditions storing the transmission waiting packets in the transmission buffer 22 are detected, from the detected feature of these storage conditions and the features of the selectable access method, any optimum access method is selected and the access method is switched.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an access control method for performing packet communication between wireless stations.
In particular, the present invention relates to control at the time of signal transmission of each wireless station in a system such as satellite communication or mobile communication in which a plurality of wireless stations share the same line and perform data communication.

[0002]

2. Description of the Related Art An access method in a wireless communication system in which a plurality of wireless stations share the same line to perform data communication is roughly classified into two types: an occupation type and a contention type. FIG. 15 shows a frequency allocation diagram showing a basic concept of each access method of the exclusive access method and the contention access method.

In the occupation type access method, a line to be used by a user is previously secured before actually starting communication.
When performing communication, there is a method of transmitting data by occupying the reserved line. Among them, a fixed allocation method in which a line is fixedly allocated to a user in advance and a demand for allocating a line to the user in response to a communication request. There is an assignment method.

The contention-type access method is a method in which a user does not secure a line before communication, but performs packet transmission while competing with another user on a shared line commonly used by each user. Among them, an ALOHA system in which each user transmits packets at random, a distributed control type CSMA (Carrier Sense Multiple Access) system in which each user transmits a packet after confirming the use status of the line,

[0005] The line control station confirms the state of use of the line,
The information is broadcast to each user, and based on the control information, each user performs packet transmission based on a centralized control type ISMA (Inhi
CDMA (Code Divis) that spreads spectrum on each packet signal transmitted by the bitSense Multiple Access (ALPHA) method or the ALOHA method, and separates each packet signal by a spreading code even if a packet collision occurs.
ion Multiple Access) -ALOHA system and the like.

[0006] Both the occupation type and the contention type access methods have advantages and disadvantages, and their application areas are different depending on the track density of each user and the traffic volume of the entire system. From the viewpoint of the line use efficiency, the occupancy type access method is such that one user occupies the used line when performing communication, so that the one line use efficiency is the time occupancy rate of packets issued by that user during communication (hereinafter, per user Traffic density).

[0007] That is, when the traffic density per user is low, the overall line use efficiency is deteriorated, and when the traffic density per user is high, the overall line use efficiency is improved. On the other hand, in the contention-type access method, since each user performs packet transmission while competing with other users using a shared line, there is always a risk of packet collision, and if a packet collision occurs, the signal is correct. Since the data is not transmitted, the line use efficiency is deteriorated.

However, in a low traffic state where there is almost no packet collision, transmitted packets are transmitted almost without errors, so that the line use efficiency is higher than in the demand allocation method of the occupied access method. Become. That is, if the entire system encounters a packet collision. In a high-traffic state where there is a high risk of occurrence, the line use efficiency becomes poor, and in a low-traffic state where there is almost no risk of packet collision, the line use efficiency becomes better than that of the occupied type.

Next, from the viewpoint of signal transmission time and collision rate, the occupation type access method has no danger of causing a packet collision, but requires time to set up a line reservation. Extra time is required for the minute signal transmission time (hereinafter referred to as line setting time). For example, in the demand assignment method, the exchange of control information with the line control station at the time of securing the line requires a delay time corresponding to the minimum propagation round trip time.

[0010] However, this line setting time can be ignored when transmitting a large amount of data such that the communication time becomes long. On the other hand, in the contention type access method, if the entire system is in a low traffic state in which there is almost no risk of packet collision, the signal transmission time becomes shorter as compared with the occupation type because there is no line setting time.

However, when the entire system is a high traffic bear with a high risk of packet collision, packet retransmission due to packet collision is frequently performed, and the signal transmission time becomes longer by the retransmission time. As mentioned above,
Both the occupancy type and the contention type access methods have advantages and disadvantages. The occupancy type is very useful when the traffic density per user is high, but when the traffic density per user is low, the line utilization efficiency of the entire system decreases. I do.

The contention type is useful when the traffic volume of the entire system is low, but when the traffic volume is high, the packet collision rate becomes very high, and the characteristics of the line utilization efficiency and the signal transmission time of the entire system deteriorate. Thus, the occupancy type,
The competitiveness of both access methods depends on the traffic density of the user and the traffic volume of the whole system, and conventionally, the traffic characteristics of the communication service to which the communication system is applied when designing the communication system are conventionally used. Appropriate access methods were applied.

[0013]

In recent years, with the development of network technology centering on TCP / IP, and the spread of computer equipment accompanying the miniaturization and economicalization of terminals, the number of users performing computer communication has increased rapidly, and voice, There is an increasing demand for communication systems that allow many users to efficiently and economically transmit various information such as images and data.

In order to realize such a system as a wireless line, a wireless line access control method for efficiently transmitting various signals from a large number of users is important. In an access control system in which a contention-type access method is applied alone, it is difficult to efficiently transmit various signals from a large number of users as described above due to the features of the two access methods.

For example, when only one occupied access method is applied in one communication system, if the actual amount of packets to be transmitted is very small in terms of time ratio while the user who occupies the line is occupied, The line occupied by the terminal has a long period of time during which packet transmission is not performed (hereinafter referred to as idle time), and the line use efficiency is extremely poor, so that many users cannot efficiently transmit signals.

When only one contention type access method is applied to one communication system, if one user transmits packets continuously for a long time, if another user transmits packets, The possibility of packet collision is very high, and many users cannot transmit signals efficiently.

Further, when only one contention-type access method is applied to one communication system, the traffic volume of the entire system is high even if all users transmit only intermittently short packets. In this case, the risk of causing a packet collision increases, and many users cannot transmit signals efficiently.

Therefore, for example, when the time ratio of the amount of packets to be transmitted fluctuates for each user (hereinafter referred to as fluctuation of the traffic density of each user), or when the traffic amount of the entire system changes over time, In the access control method in which both the access method of the type and the competition type are applied independently, the above disadvantage cannot be avoided unless special measures are taken.

According to the present invention, various signals from a large number of users can be efficiently transmitted even if there is any change in traffic characteristics such as a change in traffic density of each user as described above or a change in traffic volume of the entire system. It is an object of the present invention to provide a wireless line access control method and a transmission device capable of performing the above.

[0020]

According to the present invention, the above-mentioned object is solved by the means described in the claims. That is, according to the first aspect of the present invention, a plurality of wireless stations are connected to each other by a wireless line shared by each wireless station, and transmission data from each wireless station is divided into packets of unspecified size called packets. In a packet radio communication system transmitted by

The transmission device of each radio station has a transmission buffer for storing transmission packets, and a function of selecting a plurality of access methods for transmission, and a transmission buffer for transmitting packets stored in the transmission buffers. This is a wireless channel access control method that detects a feature of the storage status, selects an optimal access method based on the detected feature of the storage status, and a feature of a selectable access method, and switches the access method.

According to a second aspect of the present invention, a plurality of wireless stations are connected to each other by a wireless line shared by the wireless stations, and data transmitted from each wireless station is divided into packets of unspecified size called packets. In a packet radio communication system transmitted by the radio station, a transmission buffer for accumulating transmission packets in a transmission device of each radio station;

A function of selecting a transmission wireless line having a plurality of line speeds at the time of transmission, detecting a characteristic of an accumulation state of a transmission waiting packet stored in the transmission buffer, and detecting the detected accumulation; Depending on the characteristics of the situation, select the wireless line with the best line speed and
This is a wireless channel access control method for switching to the wireless channel.

According to a third aspect of the present invention, a plurality of wireless stations are connected by a wireless line shared by each wireless station, and data transmitted from each wireless station is divided into packets of unspecified size called packets. In a packet radio communication system, a transmission buffer for storing transmission packets in a transmission device of each radio station, a function of selecting a plurality of methods as an access method for transmission, and a plurality of lines as transmission radio lines Equipped with a function to select the speed,

The characteristic of the accumulation state of the transmission waiting packet stored in the transmission buffer is detected, and the optimum access method is selected and accessed based on the detected characteristic of the accumulation state and the characteristic of the selectable access method. Switch methods,
Further, there is provided a wireless line access control method for selecting a wireless line having an optimum line speed based on the detected amount of packets and switching to the wireless line.

According to a fourth aspect of the present invention, a plurality of wireless stations are connected to each other by a wireless line shared by the wireless stations, and transmission data from each wireless station is divided into packets of unspecified size called packets. In a packet radio communication system transmitted and transmitted, a radio line shared by each radio station is divided into a plurality of groups, and a group in which the number of radio stations using the radio lines in the group is not limited, and a group in the group A group that limits the number of wireless stations using wireless lines to a certain number or less,

A transmission buffer for storing transmission packets in a transmission device of each radio station, and a function of selecting a radio line group as a transmission radio line for transmission, and a transmission waiting packet stored in the transmission buffer. This is a wireless channel access control method for detecting a characteristic of the storage status of the wireless network, selecting a wireless channel of an optimal wireless channel group based on the detected characteristic of the storage status, and switching to the wireless channel.

According to a fifth aspect of the present invention, in the wireless line access control method according to any one of the first to fourth aspects, the transmission state of the transmission waiting packet stored in the transmission buffer is characterized by a characteristic of the transmission state. At least one of the total number of bits of the transmission waiting packet stored in the buffer and the time change rate of the total number of bits of the transmission waiting packet stored in the transmission buffer, or stored in the transmission buffer. It is configured to use at least one of the number of packets waiting to be transmitted and the time change rate of the number of packets waiting to be transmitted stored in the transmission buffer.

According to a sixth aspect of the present invention, there is provided a radio transmission apparatus for transmitting transmission data by dividing the transmission data into blocks of an unspecified size called packets, wherein the interface converts the transmission data into an electric signal for transmission. A conversion unit, a transmission unit for transmitting a wireless signal, a function of storing transmission standby packets interposed between the interface conversion unit and the transmission unit, and detecting a characteristic of the accumulation state of the transmission standby packets in the transmission buffer. A wireless transmission device comprising: a transmission buffer unit having a transmission buffer unit; and a control unit that controls transmission of packets by the access control method based on characteristics of the accumulation state of the packets waiting to be transmitted detected by the transmission buffer unit.

According to a seventh aspect of the present invention, in the wireless transmission apparatus according to the sixth aspect, the transmission buffer unit is configured to transmit the total number of bits of the transmission waiting packet stored in the transmission buffer and the transmission waiting packet stored in the transmission buffer. At least one of a time change rate of the total number of bits of the packet, or at least one of a time change rate of the number of packets of the transmission waiting packet stored in the transmission buffer and a packet number of the transmission waiting packet stored in the transmission buffer. Is detected.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the basic concept of the present invention will be described with reference to the following specific examples, and based on the basic concept,
An embodiment of the present invention will be described with reference to the drawings. The traffic characteristics of transmission data in a communication system using the present invention are roughly considered to be two points: an access signal to a server or the like and a file transfer signal to another user.

(1) Characteristics of Access Signal to Server and the Like Computer communication is used in a client-server communication mode in which a user transfers a large-capacity file such as an image, a program file, and data from a server. Is considered to be the main. In the client-server communication type, the access signal transmitted by the user to the server side can be a data request signal indicating a data request and a data confirmation signal for the data signal transferred from the server.

The information amount of both the data request signal and the data confirmation signal is small compared to the information amount of the file transfer signal, and the size of the transmission packet is small for both the data request signal and the data confirmation signal. Further, since the transmission of the transmission packet of the data request signal is performed when the user desires the data transfer from the server, the transmission of the transmission packet of the data request signal depends on human will. The probability of continuous delivery is near zero.

The transmission of the data confirmation signal transmission packet is performed when the user receives a certain amount of data from the server, so that the transmission packet is not transmitted continuously. Therefore, since the traffic density per user of the access signal transmitted by the user to the server side is very small as compared with the file transfer signal, the packet communication access control method when the user transmits the access signal to the server side is as follows. It is desirable to apply a contention type access method.

(2) Characteristics of File Transfer Signal to Other Users In computer communication, in addition to a communication mode in which a user receives data or the like from a server, such as a client-server type, a user can send an FTP or other data to another user. e-mail
A communication mode in which data and the like are transferred using an application such as the above is also conceivable.

In this case, since the signal transmitted by the user is mainly a large-capacity file such as an image, a program file, and data, the packet is continuously transmitted, and the access signal to the server or the like is transmitted. The traffic density per user is large as compared with. Therefore, it is desirable to apply an exclusive access method as an access control method at the time of a file transfer signal to another user.

The present invention is proposed under the above-described background, and estimates the communication use mode of each user by observing the characteristics of the accumulation status of packets waiting to be transmitted stored in the transmission buffer of the transmission device. , Based on the estimation result,
A wireless line access control method and a transmission device capable of efficiently transmitting various signals from a large number of users by enabling an optimal access method, selection and use of a wireless line.

Hereinafter, a configuration common to the embodiments of the present invention will be described with reference to FIGS. FIG.
1 is a block diagram illustrating a configuration of a communication terminal including a transmission device according to each embodiment, where 1 is a packet source, and 2 is a transmission device. FIG. 2 is a block diagram showing the configurations of the transmission buffer unit 22 and the control unit 23 in FIG. 1 and 2 are used without particular reference to which figure.

The packet source 1 is a logical means.
Although it may be an independent device such as a computer or a control signal generation source built in the transmission / reception device, the description will be given here assuming that the device is a packet communication device independent of the transmission device. Further, even if it is considered that the transmitting device 2 has not only the transmitting function but also the receiving function, the following description is completely the same, but here, the description will be limited to only the transmitting function.

Next, the configuration of a wireless transmission apparatus according to an embodiment of the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 21 in the transmission device 2 denotes an interface conversion unit having a function of converting bit information for a data signal flowing from a packet source into an electrical signal for transmission and outputting the electrical signal to a later-described 22. .

Reference numeral 22 denotes a transmission buffer unit having a function of accumulating a transmission signal packet flowing from the interface conversion unit 21 until the packet is actually transmitted and a function of detecting the characteristics of the accumulation state of the packet. , 2
Reference numeral 4 denotes a transmission unit having a function of actually transmitting a transmission signal packet flowing from the transmission buffer unit 22 to an external wireless line.

Reference numeral 23 denotes a function for selecting an optimal access method and a radio line based on the characteristics of the accumulation status of the packet detected by the transmission buffer unit 22, the selectable access methods, and the characteristics of the radio line. A control unit 24 has a function of controlling the switching to the optimum access method and the wireless line.

In FIG. 2, reference numeral 221 in the transmission buffer 22 denotes a transmission-waiting packet storage unit having a function of storing transmission-waiting packets, and 222 denotes a transmission-waiting packet stored in the transmission-waiting packet storage unit 221. This is a storage packet amount detection unit having a function of detecting the characteristics of the storage situation.

Also, in FIG.
Has a function of selecting an optimal access method and a wireless line based on the characteristics of the accumulation state of the transmission waiting powder detected by the stored packet amount detection unit 222 and the selectable access methods and wireless line characteristics. An optimum access method-one wireless channel selecting unit 232 has a function of controlling the transmitting unit 24 in FIG. 2 to switch to the optimum access method and the wireless channel based on the selection of the optimal access method-one wireless channel selecting unit. It is a transmission control unit.

The characteristics of the accumulation status of the packets waiting to be transmitted stored in the transmission buffer unit may be any arbitrary amounts as long as the packets represent the characteristics of the accumulation status of the packets. The total number of bits of a transmission waiting packet stored in the transmission buffer unit according to claim 5 or 7, the number of transmission waiting packets stored in the transmission buffer unit, or the total number of packets of the transmission waiting packet stored in the transmission buffer unit. Time change rate of the total number of bits of

The time change rate of the number of packets waiting for transmission stored in the transmission buffer unit, the total number of bits of the packets waiting for transmission stored in the transmission buffer unit, and the transmission rate stored in the transmission buffer unit The time change rate of both the total bit number of the waiting packet and the total bit number of the transmission waiting packet stored in the transmission buffer unit and the total bit number of the transmission waiting packet stored in the transmission buffer unit Both are considered.

Next, an example of the invention described in claim 1 will be described as a first example of the embodiment. FIG. 3 is a frequency assignment diagram showing the basic concept of the first example of the embodiment of the present invention. FIGS. 4 and 5 show the basic concept of the first embodiment of the present invention. It is a flowchart shown in sequence.

It is assumed that the communication system of the present embodiment is provided with the above-mentioned two access methods of the occupation type and the contention type, and the frequency band to be used (A1 in FIG. 3) is determined by the contention type access method. It is divided into a band (A11 in FIG. 3) and a dedicated access method band (A12 in FIG. 3).

Each user performs communication (al in FIG. 4).
First, a predetermined packet amount detection interval time t is set by the accumulated packet amount detection unit 222 in the transmission buffer unit 22 (a2 in FIG. 4), and the transmission control unit 232 in the control unit 23 The access method used by the user is selected as the conflict type access (a3 in FIG. 4). According to the above control, at the beginning of communication, the user performs communication using the competitive access method.However, by performing the control as described below, the user can appropriately switch the access method to the exclusive type and perform communication. Become.

Next, the above described packet amount detection interval time t
After this is set, every time the detection interval time t elapses (a4 in FIG. 4), the stored packet amount detection unit stores the packet in the transmission waiting packet storage unit 221 in the transmission buffer unit 22. Various quantities of the packet waiting for transmission, which characterize the accumulation status of the packet, are detected (a in FIG. 4).
5).

After the various amounts of the packet are detected, the optimum access method and the radio line selection unit 231 in the control unit 23
Thus, an optimum access method is selected based on various amounts of the packet and characteristics of the selectable access method (FIG. 4).
A6), and controls the transmission unit of the transmission control unit 24 to perform transmission using the selected optimal access method (a7 in FIG. 5).

After the control, again after the predetermined detection interval time t, the stored packet amount detector detects the characteristics of the accumulation state of the transmission waiting packets stored in the transmission waiting packet storage unit. The various quantities are detected (return to a4 in FIG. 4), and the above-described series of procedures are repeated (a4 to a7 in FIG. 4).

Further, the transmitting unit 24 under the above control
Always determines whether or not a packet is stored in the transmission queue storage unit (α2 in FIG. 5), and if the packet is stored, extracts the first packet from the transmission queue storage unit (FIG. 5). α3), the extracted packet is transmitted using the access method selected above (α4 in FIG. 5).

The basic concept of the first example of the embodiment of the present invention has been described above. Next, a practical example of the embodiment will be described as a specific communication example of the user to the server or the like. The case of an access signal and a file transfer signal to another user will be described as an example. When the user's communication transmits an access signal to the server, for example, by accessing the server as described above,

The signal transmitted from the radio station has a small capacity, and the packet source 1 in FIG. 1 has a very low possibility of generating a packet amount exceeding the transmission capacity in the contention type access method. Since there is very little possibility that a transmission-waiting pad is accumulated in the transmission-waiting packet accumulation unit, the access method is maintained as a contention type unless the accumulation phenomenon is detected.

For example, when a user's communication is to transfer a file to another user as described above, a large amount of signals are transmitted. Then, the transmission waiting packet is accumulated in the transmission waiting packet accumulation unit.

The pre-storage packet quantity detection unit detects the quantity of the packet indicating the characteristic of the accumulation state of the transmission waiting packet stored in the transmission waiting packet accumulation unit, so that the control unit 23 can detect the detected packet quantity. Judging that the traffic volume of the packet issued by the user is large from the various packet amounts, and occupying the access method from the competitive type based on the detected various amounts of the packet and the characteristics of the contention type and occupation type access methods. Switch to type (from A11 to A12 in FIG. 3).

When switching to the occupation type, an empty channel is searched for from the occupation type channels CH1, CH2,... Chn, and the empty channel is occupied. Thereafter, when the user has transmitted all the files to be transmitted, the amount of packets stored in the transmission waiting packet storage unit will decrease,

The stored packet quantity detecting unit detects the packet quantities that characterize the accumulation status of the transmission waiting packets stored in the waiting packet accumulation unit,
The control unit determines from the detected amounts of the packet that the traffic volume of the packet issued by the user has decreased, and determines the characteristics of the contention of the packet and the contention-based and tangible access methods. , The access method is switched from the occupation type to the contention type, and the occupied channel is released (from A12 to A11 in FIG. 3).

When the communication of the user is switched from the transmission of the access signal to the server or the like to the file transfer to another user, the user sends the access signal to the server or the like transmitting the small-capacity signal. When doing so, communicate with the conflicting access method according to the procedure described above,

When the communication of the user is switched to the file transfer for transmitting a large amount of signals, packets are transmitted and stored in the packet storage unit for waiting for transmission.
The stored packet quantity detection unit detects various quantities of the packet indicating the characteristics of the accumulation state of the transmission waiting packet stored in the transmission waiting packet stacking unit,

The control unit determines from the detected various amounts of the packet that the traffic volume of the packet issued by the user has increased, and determines the various amounts of the detected packet and the contention type and the exclusive type. The access method is switched from the competitive type to the exclusive type based on the characteristics of the access method (from A11 to A12 in FIG. 3). The procedure for occupying the channel is exactly the same as described above.

On the contrary, when the communication of the user is switched from transmitting a file to another user to transmitting an access signal to a server or the like, when the user performs a file transmission for transmitting a large-capacity signal, the above-described operation is performed. Communication is performed by occupation type access by following the procedure as described above, but when the user's communication is switched to an access signal to a server etc. that transmits a small capacity signal, it is stored in the transmission waiting packet storage unit. The amount of packets that are

The storage packet quantity detector detects various quantities of the packet waiting for transmission stored in the transmission packet storage, which are characteristic of the accumulation status of the packet. It is determined that the traffic volume of the packet issued by the user is decreasing from the various amounts of the packet, and based on the detected various amounts of the packet and the characteristics of both the contention type and the exclusive type access methods, the access method is set to the exclusive type. To the contention type and release the occupied channel (from A12 to A11 in FIG. 3).

As described above, the first example of the embodiment of the present invention transmits various amounts of packets indicating the characteristics of the accumulation state of the transmission waiting packets stored in the transmission waiting packet storage unit in the transmission buffer unit. By detecting the amount of accumulated packets in the buffer unit 22 and estimating the amount of traffic of the packet issued by the user, the access method used by the user for communication is optimized for the amount of traffic of the packet issued by the user. Switch to a different access method.

For example, when a user transmits a large-capacity signal such as a file transfer to another user, an exclusive access method is applied, and the user transmits a small-capacity signal such as an access signal transmission to a server or the like. If so, apply a conflicting access method. As a result, each user can perform communication using an access method suitable for the traffic generation amount of each user, and can efficiently transmit various signals from many users.

Next, an example corresponding to the second aspect of the present invention will be described as a second example of the embodiment. FIG.
Is a frequency allocation diagram showing a basic concept of a second example of the embodiment of the present invention, and FIGS. 7 and 8 are flowcharts showing the basic concept in a time-series manner. The communication system of the present embodiment is premised on that a wireless line having a plurality of line speeds is provided in advance, and the frequency band to be used (B1 in FIG. 6) is a wireless line band having each line speed (FIG. 6). Are divided into B11, B12,... B1k).

However, the line speeds C1, C of each wireless line
, Ck are in a magnitude relationship of C1 <C2 <... <Ck, and the radio line is set to CH1-N1, CH1-N2,. , CH1-
It is assumed that Nk lines are provided. When each user performs communication (bl in FIG. 7), first, the accumulated packet amount detection unit 2
A predetermined packet amount detection interval time t is set by 22 (b2 in FIG. 7), and a transmission line used by the user is selected by the transmission control unit 22 as an arbitrary free line (b3 in FIG. 7). .

According to the above control, at the beginning of communication, the user performs communication using a selected radio line.
With the control described below, the user switches the wireless line to be used to a wireless line having a different line speed and performs communication as appropriate. Next, after the packet amount detection interval time t is set, the detection interval time t
Every time (b4 in FIG. 7) elapses, the stored packet amount detection unit

Various quantities of the transmission waiting packet stored in the transmission waiting packet storage section 221 in the transmission buffer section 22 are detected (b5 in FIG. 7). After the various amounts of the packet are detected, the control unit 2
3 is detected by the transmission control unit 232 in FIG. 3 (b6 in FIG. 7), and the optimal access scheme and radio line selection unit 231 in the control unit 23

A wireless line having an optimum line speed is selected from the idle wireless lines based on the characteristics of the quantities of the packets to be stored and transmitted and the characteristics of the line speed of the idle wireless line (b7 in FIG. 7). The transmission control unit is configured to operate as shown in FIG.
(B7 in FIG. 7) to perform transmission using the wireless line having the selected line speed for the transmitting unit. After the control, again, after the predetermined detection interval time t, the stored packet various amount detector detects the various amounts of the packets indicating the characteristics of the accumulation state of the transmission waiting packets stored in the transmission waiting packet storage unit. Detection is performed (return to b4 in FIG. 7), and the above-described series of procedures is repeated (b4 to b in FIG. 7).
7).

Further, the transmission unit 24 under the above-mentioned control
Always determines whether or not a packet is stored in the transmission queue storage unit (β2 in FIG. 8). If the packet is stored, the first packet in the transmission queue storage unit is taken out (β2 in FIG. 8). β3), the extracted packet is transmitted using the wireless line having the line speed selected above (β4 in FIG. 8).

The basic concept of the embodiment corresponding to the second aspect of the present invention has been described above. Next, a practical example of the second embodiment will be described in the same manner as in the first aspect. As an example, a description will be given of a case where the signal is an access signal to a server or the like and a file transfer signal to another user. For example, if the user has a wireless line with a line speed C1 (FIG. 6)
In the case where the communication is being performed by Bll), when the communication being performed by the user is to transfer a file to another user as described above, a large-capacity signal is transmitted. Causes a packet amount exceeding the transmission capacity C1,

The amount of packets waiting for transmission is stored in the packet storage unit for transmission waiting. The storage packet amount detection unit detects various amounts of the packet indicating the characteristics of the accumulation state of the transmission waiting packet stored in the transmission waiting packet storage unit. Determines that the traffic volume of the packet issued by the user is large, and based on the detected amount of the packet and the characteristics of the available line speeds C1, C2,. A wireless line having an optimal line speed is selected from the lines and switched to the wireless line (FIG. 6).
reference).

When switching to the wireless line, for example, when the line speed of the wireless line is Ci (1 ≦ i ≦ k), the channels CHi-1,...
Among them, it is conceivable to select an empty channel and perform communication on the channel. Further, when the user is communicating on the wireless line (B1k in FIG. 6) of the line speed Ck, the communication performed by the user is performed by the user accessing the server as described above. In the case of transmitting a signal, a signal transmitted from a wireless station has a small capacity, and thus the possibility that a transmission waiting packet is stored in the transmission waiting packet storage unit is low.

Also, since the amount of packets to be stored is very small even when the packets are stored, the stored packet amount detector detects the characteristics of the storage status of the transmission waiting packets stored in the transmission waiting packet storage unit. By detecting various amounts of the packet, the control unit determines that the traffic amount of the packet issued by the user is small from the various amounts of the detected packet, and can select the various amounts of the detected packet. Line speeds C1, C2,..., Ck of idle radio lines
Based on the characteristics of (1), one of the available line speeds is selected as the optimum line speed and switched to the wireless line (see FIG. 6). The procedure for switching to the wireless line is exactly the same as in the above case.

The case where the line speed of the radio line used by the user is C1 and the case where the line speed is Ck has been described above. The detection unit detects various quantities of the pad that characterize the accumulation state of the transmission waiting packet stored in the transmission waiting packet storage unit,

The control unit determines the magnitude and increase / decrease of the traffic volume of the packet generated by the user from the detected various amounts of the packet, and determines the characteristics of the detected various amounts of the packet and the selectable available wireless line. Line speed C1, C2, ...
Based on the characteristics of Ck, select a wireless line with an optimum line speed among available wireless lines and switch to the wireless line (see FIG. 7). The procedure for switching to the wireless line is exactly the same as in the above case.

As described above, according to the embodiment of the present invention, the transmission buffer unit 22 stores the various amounts of the packet indicating the characteristics of the transmission waiting packet accumulation state stored in the transmission waiting packet accumulation unit in the transmission buffer unit. By detecting the amount of packets transmitted by the user by detecting the amount of packets stored in the storage unit 222, a wireless line used by the user for communication can be adjusted to a line speed optimal for the amount of packets transmitted by the user. Switch to wireless line,

For example, when a user transmits a large-capacity signal such as a file transfer to another user, it is possible to perform communication using a wireless line having a high line speed, and the user can transmit an access signal to a server or the like. When transmitting small-capacity signals such as the above, each user must use a wireless line with a line speed suitable for the amount of traffic generated by each user so that communication can be performed using a wireless line with a low line speed. It is possible to perform communication by using the terminal, and various signals from a large number of users can be efficiently transmitted. Next, an embodiment of the invention will be described.

FIG. 9 is a frequency assignment diagram showing a basic concept of an embodiment corresponding to the third aspect of the present invention.
0 and FIG. 11 are flow charts showing the basic concept of the embodiment of the third aspect of the invention in chronological order. This embodiment is a combination of the embodiment corresponding to claim 1 and the embodiment corresponding to claim 2. In the communication system, the above-described two access methods of the exclusive type and the contention type are used in advance. Provided, furthermore, in the occupation type access method, it is assumed that a wireless line having a plurality of line speeds is provided,

The frequency band to be used (C1 in FIG. 9) is divided into a contention type access method band (C11 in FIG. 9) and an occupation type access method band (C12 in FIG. 9). It is divided into wireless line bands (C121, 122, C12k in FIG. 9) having respective line speeds. However, the line speeds C1, C2,.
, Ck have a magnitude relationship of C1 <C2 <... <Ck, and the radio line is set to CH1-N for each line speed.
It is assumed that 1, CH1-N2 and CH1-Nk are provided.

Each user performs communication (C in FIG. 10).
1) First, a predetermined packet amount detection interval time t is set by the stored packet amount detection unit 22 (C in FIG. 10).
2) Then, the transmission control unit 232 in the control unit 23 selects the access method used by the user as the contention type access method (C3 in FIG. 10). According to the above control, at the beginning of the communication, the user performs communication using the contention type access method. However, by the same control as the embodiment corresponding to claim 1 as described below, the access method is appropriately changed to the exclusive type. Communication is performed by switching.

Next, the packet amount detection interval time t described above
Is set, every time the detection interval time t elapses (C4 in FIG. 10), the storage packet output unit outputs
Transmission waiting packet storage unit 221 in transmission buffer unit 22
Various quantities of the packet waiting to be transmitted, which are stored in the storage device, are detected (C5 in FIG. 10). After the various amounts of the packet are detected, the characteristics of the various amounts of the detected packet and the selectable access are determined by the optimum access method and the radio channel selection unit 231 in FIG. 3 in the control unit 23 of FIG. An optimal access method is selected based on the characteristics of the method (C6 in FIG. 10),

The transmission control section is selected by the transmission section 24. The transmission is controlled using the optimal access method (C7 in FIG. 10). If the optimal access method selected above is of the contention type, again after the predetermined detection interval time t, the transmission packet stored in the transmission packet storage unit by the stored packet amount detection unit. The amount of the packet representing the characteristic of the accumulation status of the packet is detected (return to C4 in FIG. 10), and the above-described series of procedures is repeated (C4 to C8 in FIG. 10).

In the case where the optimal access method selected above is an occupation type, the user can control the radio line used in the occupation type access method by the same control as in the embodiment according to the second aspect. Thus, communication is performed by switching to a wireless line having a different line speed. That is, after the optimal access method is determined to be the occupation type (C8 in FIG. 10), the transmission control unit detects an empty wireless line (C9 in FIG. 10), and the optimal access method and the wireless line selection unit , Based on the characteristics of various amounts of the packet already detected (C5 in FIG. 10) and the characteristics of the line speed of the idle wireless line.

The wireless line having the optimum line speed is selected from the idle wireless lines (C10 in FIG. 10), and the transmission control unit uses the wireless line having the selected line speed for the transmitting unit 24. To perform transmission (C1 in FIG. 10).
1). After the control, after the predetermined detection interval time t, the stored packet amount detecting unit detects various amounts of the packet indicating the characteristics of the accumulation state of the transmission waiting packet stored in the transmission waiting packet accumulation unit. Is performed (return to C4 in FIG. 10), and the above-described series of procedures is repeated (C4 to C11 in FIG. 10).

The transmitting unit 24 receiving the above control always
It is determined whether or not a packet is stored in the packet to be transmitted storage unit (γ2 in FIG. 11). If the packet is stored, the first packet in the packet to be transmitted storage unit is extracted (γ3 in FIG. 11) and extracted. The packet is transmitted using the access method and the radio channel selected above (γ4 in FIG. 11). The basic concept of the embodiment of the invention described in claim 3 has been described above. Next, a practical example of this embodiment will be described as a specific communication example of a user by using an access signal to a server or the like described above and another user. This will be described by taking as an example a case where the file transfer signal is a file transfer signal.

When the user or the like transmits an access signal to the server by accessing the server or the like as described above, the communication is exactly the same as in the embodiment according to claim 1, Since there is very little possibility that a packet waiting to be transmitted is stored in the packet storage unit, the access method is maintained as a contention type unless the storage phenomenon is detected. If the user's communication is, for example, a file transfer to another user as described above, the amount of packets waiting to be transmitted is stored in the packet storage unit in the same way as in the embodiment according to the claims. Accumulated,

The storage packet quantity detecting section detects the quantity of the packet indicating the characteristic of the accumulation state of the packet waiting to be transmitted stored in the packet storage section for transmission, so that the control section detects the packet amount and stores the packet. It is determined that the traffic volume of the packet issued by the user is large from the various amounts of the packet, and the access method is changed from the contention type to the occupied Switch to (from C11 in FIG. 9 to C12)
In addition, the characteristics of various quantities of the packet and the line speeds C1, C2,.
Based on the characteristics of k, a wireless line with an optimum line speed is selected from the idle wireless lines and switched to the wireless line.

When switching to the wireless line, for example, if the line speed of the wireless line is Ci (1 ≦ i ≦ L, the channel speeds of channels CHi-1,... An idle channel is selected and communication is performed on the channel, and when the communication of the user switches from transmitting the access signal to the server or the like to transferring the file to another user, an embodiment according to claim 1 is performed. In exactly the same way as in the case of the mode, the access method is switched from the contention type to the exclusive type (from C11 to C12 in FIG. 9).

On the contrary, when the communication of the user is switched from the file transfer to another user to the transmission of the access signal to the server or the like, in the same manner as in the embodiment according to claim 1, As a result, the access mode is switched from the occupation type to the contention type (from C12 to C11 in FIG. 9). or,
For example, when a user's communication transfers a file to another user as described above, the file transfer capacity fluctuates greatly over time, and when the file is transferred, the communication is performed in the exclusive access method according to the above procedure. But
If your file transfer capacity grows exponentially,

The amount of packets waiting to be transmitted stored in the packet storage unit 2 is increased, and the storage packet quantity detector detects the characteristics of the state of accumulation of packets waiting to be transmitted stored in the packet storage unit. By detecting the amount of the packet, the control unit determines that the amount of traffic of the packet issued by the user is increasing from the amount of the detected packet, and determines the amount of the detected packet. And the line speeds C1,
Based on the characteristics of C2,..., Ck, a wireless line having an optimum line speed is selected from the available wireless lines and switched to the wireless line. The switching to the wireless line is exactly the same as in the embodiment according to the second aspect.

On the other hand, if the file transfer capacity suddenly decreases, the amount of packets stored in the packet waiting for transmission decreases, and the amount of packets waiting to transmit decreases. By detecting various amounts of the packet waiting for transmission stored in the waiting packet storage unit, the control unit determines the amount of traffic of the packet generated by the user from the detected various amounts of the packet. Is determined to be the best among the available wireless lines based on the detected amount of the packet and the characteristics of the line speeds C1, C2,..., Ck of the available available wireless lines. A wireless line with an appropriate line speed is selected and switched to the wireless line. The control when switching to the wireless line is exactly the same as in the embodiment according to the second aspect.

As described above, an embodiment according to claim 3 relates to a transmission buffer for storing various amounts of packets indicating the characteristics of the accumulation state of the transmission waiting packets stored in the transmission waiting packet storage unit in the transmission buffer unit. By detecting the amount of traffic of the packet issued by the user from the detection by the accumulated packet amount detecting unit 222 in the unit 22, the access method used by the user is changed to the optimal access method for the traffic amount of the packet issued by the user. switching,

For example, when a user transmits a large-capacity signal such as a file transfer to another user, an exclusive access method is applied, and the user transmits a small-capacity signal such as transmitting an access signal to a server or the like. In such a case, each user can communicate using an access method suitable for the amount of track occurrence of each user, such as applying a conflict type access method. In the access, by estimating the traffic volume of the packet issued by the user from the characteristics of the amount of the packet indicating the characteristics of the accumulation status of the transmission waiting packet stored in the transmission waiting packet storage unit in the transmission buffer unit,

By switching the radio line used by the user to a radio line having an optimum line speed for the traffic volume of the packet issued by the user, each user can use a radio line having a line speed suitable for the traffic generation amount of each user. Communication becomes possible, and each user selects an access method that is optimal for the traffic form of each user, and selects a wireless line with a line speed that is optimal for the transmission capacity of the signal transmitted by each user, and performs the access. Since it is possible to perform communication using the system and the wireless line, various signals from a large number of users can be efficiently transmitted.

Next, an embodiment corresponding to claim 4 will be described. FIG. 12 is a frequency assignment diagram showing the basic concept of the embodiment corresponding to claim 4, and FIG.
3, FIG. 14 is a flow chart showing the basic concept of the embodiment according to claim 4 in chronological order. In the communication system of the present embodiment, the radio line shared in advance by each radio station is divided into a plurality of groups, and the group and the group within the group that do not limit the number of radio stations that use the radio lines in the group. A group is provided for limiting the number of wireless stations using wireless lines to a certain number or less.

As an example of the grouping, FIG.
Is one group that does not limit the number of wireless stations to be used (default group) and a plurality of groups that limit the number of wireless stations to be used to a certain number or less (group 1, loop 2,.
., A group n) is provided, and the use frequency band D1 is
A band corresponding to a group in which the number of radio stations to be used is not restricted (band D11 of a group with an unlimited number of radio stations) and a group corresponding to a group in which the number of radio stations to be used is limited to a certain number or less (band D12 of a group of radio station limited groups). ) Is divided.

Next, the concept of the fourth embodiment will be described with reference to an example in which a contention type access method is used alone. Each user performs communication (FIG. 13
In dl), first, a predetermined packet amount and an output interval time t are set by the stored packet amount detection unit 222 in the transmission buffer unit 22 (d2 in FIG. 13), and the transmission control unit in the control unit 23 is set. By 232, the wireless line used by the user is selected as the default group wireless line (d3 in FIG. 13).

According to the above control, at the beginning of communication, the user performs communication using the wireless line of the default group. However, the control described below allows the wireless line to be used to be changed to the wireless line of a different wireless line group as appropriate. Communication is performed by switching to a line. Next, every time the detection interval time elapses (d4 in FIG. 13) after the above-described packet amount detection interval time t is set, the stored packet amount detection unit transmits the packet in the transmission buffer unit 22. Various quantities of the transmission waiting packet stored in the waiting packet accumulating unit 221 are detected which characterize the accumulation state of the packet (FIG. 13).
D5).

After the various amounts of the packet have been detected, the optimum access method and the radio line selection unit 231 in the control unit 23
Accordingly, the optimum wireless channel group is selected (d6 in FIG. 13) based on the characteristics of the various quantities of the packet and the characteristics of the wireless channels of the selectable wireless channel groups, and the transmission control unit Next, control is performed so that transmission is performed using the wireless line of the selected group (d7 in FIG. 13).

After the suppression, after a predetermined detection interval time t, the stored packet detecting section detects various quantities of the packet indicating the accumulation state of the transmission waiting packet stored in the transmission waiting packet storage section. (Figure 1
3 to d4), and repeat the above-described series of procedures (FIG. 1).
3 d4 to d7).

Further, the transmitting section 24 under the above-mentioned control,
It is always determined whether or not a packet is stored in the packet waiting for transmission (step δ2 in FIG. 14). If the packet is stored, the first packet in the packet storing part is read out (δ3 in FIG. 14). Then, the extracted packet is transmitted using the wireless line of the wireless line group selected above (δ4 in FIG. 14). The basic concept of the embodiment of the invention described in claim 4 has been described above.
Next, a practical example of this embodiment will be described as a specific communication example of a user, taking an example of an access signal to a server or the like and a file transfer signal to another user as described above.

For example, when a user or the like transmits an access signal to the server by accessing the server or the like as described above, the signal transmitted from the radio station is small and the packet source 1 It is very unlikely that a packet exceeding the transmission capacity of the default group's wireless line will occur. Also, since the possibility of storing a transmission waiting packet in the transmission waiting packet storage unit is very small, unless the accumulation phenomenon is detected,
The wireless link of the default group is maintained.

For example, when a user's communication involves file transfer to another user as described above, a large-capacity signal is transmitted. Therefore, the packet source 1 exceeds the transmission capacity of the default group of radio lines. Such a packet amount occurs, and the transmission waiting packet is accumulated in the transmission buffer unit 22.

The storage packet quantity detector detects various quantities of the packets waiting for transmission, which are stored in the packet storage section, and indicates the characteristic of the accumulation status of the packets waiting to be transmitted. Judging that the traffic volume of the packet issued by the user is large from various packet amounts, and selecting a wireless line group with a limited number of optimum wireless stations based on the detected various amounts of the packet and the characteristics of the selectable wireless line group. Then, the method of selecting the optimal wireless line group to switch to the wireless line is:

A method of selecting a group that uses the least number of wireless stations from groups 1, 2, and n of the wireless station number limited group group, for example, a group of the wireless station number limited group group When the line speeds of the groups 1, 2,..., N are different from each other, various methods such as a method of selecting an optimum group for the transmission capacity of the signal transmitted by the user can be considered, and the use efficiency of the used frequency is improved. Any method may be used. After switching, when the user finishes sending all files to be sent,

The amount of packets stored in the transmission buffer unit is reduced, and the stored packet amount detection unit determines the amount of the packet indicating the accumulation state of the transmission waiting packet stored in the transmission waiting packet storage unit. By detecting, the control unit determines from the detected amounts of the packet that the traffic amount of the packet issued by the user is decreasing, and detects the detected amount of the packet and the selectable radio line group. Switch the wireless line group to the default group based on the characteristics.

When the communication of the user is switched from transmitting the access signal to the server or the like to transferring the file to another user, the user sends the access signal to the server or the like transmitting the small-capacity signal. When performing, the communication is performed in the default group in the same procedure as described above, and when the user's communication is switched to the file transfer transmitting the large signal, the transmission waiting packet is accumulated in the transmission buffer unit,

The storage packet quantity detector detects various quantities of the packets waiting for transmission, which are stored in the packet storage unit, and indicates the characteristics of the accumulation status of the packets waiting to be transmitted. Judging that the traffic volume of the packet issued by the user has increased from the various packet amounts, and based on the detected various amounts of the packet and the characteristics of the selectable radio line glue, the optimal number of radio stations is limited. Select a wireless line group and switch to the wireless line.

On the contrary, when the communication of the user is switched from the file transfer to another user to the transmission of the access signal to the server or the like, when the user performs the file transfer for transmitting the large-capacity signal. By performing the same procedure as described above, communication is performed in a wireless line group of a group limited to the number of wireless stations, but when user communication is switched to an access signal to a server or the like that transmits a small capacity signal, The amount of packets stored in the transmission buffer will decrease,

The storage packet quantity detector detects various quantities of the packets waiting for transmission, which are stored in the packet storage unit, and indicates the characteristic of the accumulation status of the packets waiting to be transmitted. Judging that the amount of traffic of the packet issued by the user is decreasing from the amount of packets and switching the wireless line group to the default group based on the detected amount of the packet and the characteristics of the selectable wireless line group. .

As described above, an embodiment corresponding to claim 4 is a transmission buffer for storing various amounts of packets representing the characteristics of the accumulation status of the transmission waiting packets stored in the transmission waiting packet storage unit in the transmission buffer unit. By detecting the amount of packets transmitted by the user by detecting the amount of stored packets in the unit 22 and detecting the amount of packets transmitted by the user, a radio line used by the user is changed to a radio line group optimal for the amount of packets transmitted by the user. Switching to a wireless line, for example, when a user transmits a large-capacity signal such as a file transfer to another user, communication is performed using a wireless line of a wireless frequency group of a wireless station number limited group group.

When the user transmits a small-capacity signal, such as transmitting an access signal to a server or the like, it is possible to perform communication using the wireless line of the default group, and to reduce the risk of packet collision. When transmitting a capacity signal, use a radio channel of a radio channel group with an unlimited number of radio stations to use that has a higher risk of packet collision than a radio channel group with a limited number of radio stations to use. When performing communication and transmitting a large-capacity signal with a high risk of packet collision, the number of radio stations to be used has a lower risk of packet collision than a radio channel groove in which the number of radio stations to be used is not limited. Communication is performed using wireless lines of a limited wireless line group.

As a result, the packet collision rate of the entire communication system can be kept low, and various signals from many users can be transmitted efficiently. Further, the difference from the embodiment corresponding to claim 1 is that
By using a competitive access method in all bands,
There is a possibility that the number of wireless stations assigned to each group can be statistically increased, and further efficient transmission can be expected.

In the above, the embodiment corresponding to claim 4 has been described by taking as an example the case where the contention type access method is used alone. However, even if the occupancy type access method is used alone, or Even when the contention type access method and the occupation type access method are used in combination, the procedure of this embodiment is as described above. Since the procedure is completely the same, the description is omitted here.

Next, an embodiment corresponding to claim 5 will be described. According to a fifth aspect of the present invention, there is provided a method for detecting the characteristic of the accumulation status of the waiting packets stored in the transmission buffer unit 22 according to any one of the first to fourth aspects. Detecting the number of bits, or detecting the number of packets of the transmission waiting packet stored in the transmission buffer unit, or detecting the time change rate of the total number of bits of the transmission waiting packet stored in the transmission buffer unit. Detecting,

Alternatively, detecting a time change rate of the number of packets waiting to be transmitted stored in the transmission buffer, or detecting the total number of bits of the packets waiting to be transmitted stored in the transmission buffer and the number of bits stored in the transmission buffer. Detecting both the time rate of change of the total number of bits of the stored transmission waiting packets or the number of transmission waiting packets stored in the transmission buffer unit and the transmission waiting time stored in the transmission buffer unit It is characterized in that both the time rate of change of the number of packets of a packet are detected.

Next, an embodiment corresponding to the invention of claim 6 will be described. As described above, the invention of claim 6 relates to a configuration of a wireless transmission device that divides transmission data into packets of an undefined size called packets and transmits the packets. FIG. FIG. 2 shows a configuration of a transmission buffer in the wireless transmission device and a configuration of a control unit in the wireless transmission device. In FIG. 1, reference numeral 121 in the transmission device 2 denotes an interface conversion unit having a function of converting bit information for a data signal flowing from a packet source into an electrical signal for transmission and outputting the electrical signal to a later-described 22.

Reference numeral 22 denotes a transmission buffer unit having a function of accumulating a transmission signal packet flowing from the interface conversion unit 21 until the packet is actually transmitted and a function of detecting a characteristic of the accumulation state of the packet. Yes, 24
A transmission unit having a function of actually transmitting a transmission signal packet flowing from the transmission buffer unit 22 to an external wireless line. Reference numeral 23 denotes a characteristic of the accumulation state of the packet detected by the transmission buffer unit 22 and selectable. The control unit has a function of selecting an optimal access method and a wireless line based on the appropriate access method and the characteristics of the wireless line, and a function of controlling the transmitting unit 24 to switch to the optimal access method and the wireless line.

In FIG. 2, reference numeral 221 in the transmission buffer 22 denotes a transmission-waiting packet storage unit having a function of storing transmission-waiting packets, and 222 denotes a storage of the transmission-waiting packet stored in the transmission-waiting packet storage unit 221. This is a storage packet amount detection unit having a function of detecting a characteristic of a situation.

Also, in FIG.
Has a function of selecting an optimal access method and a wireless line based on the characteristics of the accumulation state of the transmission waiting packet detected by the accumulated packet amount detection unit 222 and the selectable access methods and wireless line characteristics. An optimal access method-wireless line selector 232; a transmission controller having a function of controlling the transmitting unit 24 to switch to the optimal access method / wireless line based on the selection of the optimal access method-wireless line selector; It is.

Next, an embodiment corresponding to claim 7 will be described. According to a seventh aspect of the present invention, in the wireless transmission device according to the sixth aspect, the storage packet amount detection unit in the transmission buffer unit is configured to calculate a total of transmission queue packets stored in the transmission queue packet storage unit in the transmission buffer unit. The number of bits, the number of packets of the transmission waiting packet stored in the transmission waiting packet storage unit in the transmission buffer unit, or the time of the total number of bits of the transmission waiting packet stored in the transmission waiting packet storage unit in the transmission buffer unit Rate of change,

Alternatively, the time change rate of the number of packets waiting for transmission stored in the packet storage unit for transmission in the transmission buffer unit, or the packets waiting for transmission stored in the packet storage unit for transmission in the transmission buffer unit And the time change rate of the total number of bits of the transmission waiting packet stored in the transmission packet storage unit in the transmission buffer unit, and also stored in the transmission waiting packet storage unit in the transmission buffer unit. And a function of detecting both the number of packets of the waiting packet and the time change rate of the number of waiting packets stored in the waiting packet storage unit in the transmission buffer unit. .

[0126]

As described above, according to the present invention,
The characteristics of the packet are detected as various quantities from the accumulation state of the packets waiting to be transmitted in the transmission buffer unit, and the traffic characteristics of each user are determined based on the characteristics of the various quantities of the packet, the selectable access method, and the radio channel characteristics. Since it is possible to use an optimal access method and a radio channel according to the characteristics of the user, even if the traffic characteristics of each user fluctuate, the characteristics of various amounts of the packet of the user can be detected. Optimum access means according to the characteristics of the traffic characteristics can be applied, and the entire communication system can efficiently transmit various signals from many users.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of a configuration of a transmission device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a transmission buffer unit and a control unit of the transmission device according to the embodiment of the present invention.

FIG. 3 is a frequency allocation diagram illustrating a basic concept of a first example of an embodiment of the present invention.

FIG. 4 is a flowchart showing control at the time of starting the apparatus according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing control at the time of starting communication according to the first example of the embodiment of the present invention;

FIG. 6 is a frequency allocation diagram showing a basic concept of a second example of the embodiment of the present invention.

FIG. 7 is a flowchart showing control at the time of device startup according to a second example of the embodiment of the present invention.

FIG. 8 is a flowchart showing control at the time of starting communication according to a second example of the embodiment of the present invention;

FIG. 9 is a frequency allocation diagram illustrating a basic concept of a third example of the embodiment of the present invention.

FIG. 10 is a flowchart showing control at the time of device startup according to a third example of the embodiment of the present invention.

FIG. 11 is a flowchart illustrating control at the time of starting communication according to a third example of the embodiment of the present invention;

FIG. 12 is a frequency allocation diagram illustrating a basic concept of a fourth example of an embodiment of the present invention.

FIG. 13 is a flowchart showing control at the time of device startup according to a fourth example of the embodiment of the present invention.

FIG. 14 is a flowchart showing control at the time of starting communication in a fourth example of the embodiment of the present invention.

FIG. 15 is a frequency allocation diagram showing a basic concept of a conventional access method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 packet source 2 transmission device 21 interface conversion unit 22 transmission buffer unit 23 control unit 24 transmission unit 22 transmission buffer unit 23 control unit 221 transmission waiting packet storage unit 222 stored packet amount detection unit 231 optimal access method and wireless channel selection unit 232 Communication function control unit

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Kazama 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo F-term in Nippon Telegraph and Telephone Corporation 5K033 AA01 CB01 CB06 DA19 DB01 DB13 DB14 DB16 DB20 5K060 CC04 CC11 HH31 HH39 LL16 5K067 AA11 BB02 BB21 CC08 EE02 EE10 HH11

Claims (7)

[Claims] A plurality of wireless stations are connected to each other by a wireless line shared by the wireless stations, and transmission data from each wireless station is divided into unspecified blocks called packets and transmitted. In the packet radio communication system, the transmission device of each radio station has a transmission buffer for storing transmission packets and a function of selecting a plurality of methods as an access method for transmission, and is stored in the transmission buffer. A wireless circuit for detecting an accumulation state characteristic of a packet waiting to be transmitted and selecting an optimum access method based on the detected accumulation state characteristic and a selectable access method characteristic to switch an access method; Access control method. 2. A plurality of wireless stations are connected to each other by a wireless line shared by each wireless station, and transmission data from each wireless station is divided into unspecified blocks called packets and transmitted. In the packet radio communication system, the transmission device of each radio station has a transmission buffer for storing transmission packets, and a function of selecting a transmission radio line at a plurality of line speeds when transmitting. Detecting the characteristics of the accumulation status of packets waiting to be transmitted stored in the network, selecting a radio line having an optimum line speed based on the characteristics of the detected accumulation status, and switching the call currently being communicated to the radio line. Characteristic wireless line access control method. 3. A plurality of wireless stations are connected by a wireless line shared by each wireless station, and transmission data from each wireless station is divided into blocks of unspecified size called packets and transmitted. In a packet radio communication system, a transmission buffer for storing transmission packets in a transmission device of each radio station, a function for selecting a plurality of methods as an access method for transmission, and a plurality of line speeds for a transmission radio line can be selected. And a function of detecting an accumulation state of the transmission waiting packet stored in the transmission buffer, and selecting an optimum access method based on the detected accumulation state characteristic and a selectable access method characteristic. Access method, and further selects a wireless line having an optimum line speed based on the detected amount of packets, and switches to the wireless line. Radio channel Aksu control method. 4. A plurality of wireless stations are connected by a wireless line shared by each wireless station, and transmission data from each wireless station is divided into unspecified-size blocks called packets and transmitted. In a packet radio communication system, a radio line shared by each radio station is divided into a plurality of groups, and a group that does not limit the number of radio stations that use the radio lines in the group and a radio line in the group are used. A group for limiting the number of radio stations to a certain number or less is provided, and a transmission buffer for storing transmission packets in a transmission device of each radio station, and a function for selecting a radio line group as a transmission radio line for transmission are provided. Detecting the characteristics of the accumulation status of the transmission waiting packets stored in the transmission buffer, and selecting an optimal radio line of the radio line group based on the detected characteristics of the accumulation status. Te, radio channel Ax control method characterized by switching to the radio channel. 5. A transmission buffer according to claim 1, wherein said transmission buffer stores a total number of bits of said transmission queue stored in said transmission buffer and said total number of bits of said transmission queue stored in said transmission buffer. Of the time change rate of the total number of bits, or the time change rate of the number of packets waiting to be transmitted stored in the transmission buffer and the number of packets waiting to be transmitted stored in the transmission buffer. And at least one of them is used.
The wireless line access control method according to any one of the above items. 6. A wireless transmission device that divides transmission data into blocks of an unspecified size called packets and transmits the divided data, and an interface conversion unit that converts information of the transmission data into an electric signal for transmission. A transmission unit for transmitting a radio signal; a transmission buffer unit having a function of storing transmission standby packets interposed between the interface conversion unit and the transmission unit, and detecting a characteristic of the accumulation state of the transmission standby packets in the transmission buffer. And a control unit that controls transmission of packets by the access control method based on characteristics of the accumulation state of the packets waiting to be transmitted detected by the transmission buffer unit. 7. The transmission buffer unit, wherein at least one of a total number of bits of the transmission waiting packet stored in the transmission buffer and a time change rate of the total bit number of the transmission waiting packet stored in the transmission buffer, or At least one of the number of packets waiting to be transmitted stored in the transmission buffer and the time change rate of the number of packets waiting to be transmitted stored in the transmission buffer;
7. The wireless transmission device according to claim 6, wherein