JPH09214459A - Tdma communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speed up and simplify the setting/release processing of communication lines by measuring quantity corresponding to traffic from data quantity and buffer quantity transmitted from a terminal equipment and informing a base station of the measured result. SOLUTION: An input traffic measuring part 60M measuring quantity corresponding to traffic from data quantity and buffer quantity transmitted from the terminal equipment, an input traffic monitor part 61M and a line control part 39M informing the base station of the measured result are provided. The traffic quantity of data inputted from the terminal equipment to slave stations is informed to the base station as input traffic information. Thus, the base station always grasps the traffic quantity or all the slave stations. The base station cab allocate the lines to the respective slave stations without a request signal on line setting/release. Furthermore, line capacity can adaptively be increased/decreased at high speed even in the middle of communication and the communication lines can efficiently be used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a demand allocation time division multiple access communication system (DA-TDMA). INDUSTRIAL APPLICABILITY The present invention is suitable for use in a device that performs high speed data communication. The present invention is suitable for use in broadband ISDN. The present invention
The present invention relates to a variable capacity technology.

[0002]

2. Description of the Related Art A multiple access method in which a base station and a plurality of slave stations share a line resource and sets a line as necessary, is a demand-assigned time division multiple access (DA-TDMA: Demand Assi
The gn Time Division Multiple Access) method is a typical method. Further, as a line for connecting the base station and the slave station, in addition to the case of using a wireless line, a line such as an optical fiber may be used in some cases.

FIG. 18 shows a DA-TDMA (hereinafter simply referred to as TD
An overall configuration diagram of a communication method (denoted as MA) is shown. In FIG. 18, a case where a wireless line is used will be described. The base station 11 and each of the slave stations 12 to 14 are connected by a wireless line. Each of the terminal devices 16-18 is connected to the slave stations 12-14. The base station 11 manages the line resources provided between the base stations 11 and the accommodated slave stations 12 to 14, and sets the line based on the line setting request from the slave stations 12 to 14. The line resource is time-divided, and the line is set in a TDMA frame cycle composed of a plurality of time slots.

FIG. 19 shows the structure of a TDMA frame. Various channels are assigned to a plurality of time slots forming a TDMA frame. Here, the base station control channels 21 to 23 and the slave station control channels 24 to 2
6 is fixedly assigned to each of the slave stations 12 to 14 by one line. From the slave stations 12 to 14 to the base station 11
When requesting to set up or release the line to the base station, the slave station control channels 24 to 26 are used, and when the base station 11 instructs the slave stations 12 to 14 to set up or release the line. Station control channels 21-23 are used. On the other hand, the user information channels 27 to 29 are appropriately allocated to each station as necessary, and the base station 11 and the slave station 12 are allocated.
Used for data communication between

Here, the slave station control channels 24 to 2 are used.
6, the base station control channels 21 to 23, and the user information channels 27 to 29 have fixed time slots.
The line capacity can be freely set by changing the number of assigned user information channels per frame.

FIG. 20 is a diagram showing a block configuration of the TDMA device 10 provided in the slave stations 12 to 14 and the base station 11 of the conventional example. General data is temporarily stored in the buffer memory 31 via the input unit 30, and then this data is combined with the preamble output from the preamble generation unit 32 by the TDMA frame generation unit 33,
The data is modulated by the transmission unit 34 and transmitted. At this time, TDM
Assigned user information channel 27 in A frame
Transmission to 29 is controlled by the line controller 39. When outputting a line control signal, instead of the above-mentioned input data, the line control signal created by the line control unit 39 or the line control information input from the outside as input data via the input unit 30 The TDMA frame generation unit 33 adds a preamble and transmits it via the transmission unit 34.

On the other hand, the received signal is demodulated by the receiving unit 35, the preamble is removed by the TDMA frame disassembling unit 36, the line control information is sent to the line control unit 39, and the user information is sent to the user information processing unit 37. Sent. This operation is controlled by the line controller 39. After that, the user information sent to the user information processing unit 37 and the line control unit 3
A part of the line control information sent to 9 is output via the output unit 38.

FIG. 21 shows a sequence diagram of a line setting process in the conventional TDMA communication system. The time axis is taken in the vertical direction, and the processes are performed in order from the top. Note that FIG.
The dotted line in 1 represents the division of the TDMA frame, and a series of processing is performed in units of this TDMA frame. Further, a short arrow extending laterally from the line indicating the terminal devices 16 to 18 represents data output from the terminal devices 16 to 18. In addition, the processes in the slave stations 12 to 14 and the base station 11 are surrounded by squares.

In FIG. 21, when data to be transmitted is generated, the terminal devices 16-18 transmit a line setting request to the base station 11 via the slave stations 12-14. In response to the request, the base station 11 allocates the required number from the unused user information channels 27 to 29 in the TDMA frame. The line allocation instruction which is the allocation result is the slave station 12
-14, the slave stations 12-14 transmit burst signals to the designated user information channel according to this instruction. The base station 11 confirms the reception of this burst signal and transmits a line setting confirmation notice to the slave stations 12-14. After the line is established between the base station 11 and the slave stations 12 to 14 in this way, the completion of the line setting is notified to the terminal devices 16 to 18, and the data transmission is started. The data is once stored in the buffer memory 31 of the slave stations 12 to 14,
It is transmitted by bundling for each designated user information channel in the TDMA frame. This series of line allocation processing is performed by software processing for both the base station 11 and the slave stations 12-14.

FIG. 22 shows a sequence diagram of line release processing in the conventional TDMA communication system. Terminal device 16-
At 18, after the data transmission is completed, a line release request is sent to the base station 11 via the slave stations 12-14. In response to this, the base station 11 transmits a line release instruction to the slave stations 12 to 14, and the slave stations 12 to 14 which have received the line release instruction notify the terminal devices 16 to 18 to that effect, and The burst transmission is stopped and the line release confirmation is transmitted to the base station 11. With this line release handshake, the data transmission processing communication ends and the line is released.

As a multiple access method other than the TDMA communication method described above, frequency division multiple access (FDMA:
A frequency division multiple access (CDMA) system, a code division multiple access (CDMA) system, and the like can be cited, but the line allocation processing is the same as in the case of the TDMA communication system. Further, even when a wired line is used, it is possible to perform the same processing as the above-described method by simply combining or distributing the signals at the base station.

[0012]

At present, various services can be provided on a simple network in a broadband ISDN network using an asynchronous transfer mode (ATM). In this ATM, not only high-speed communication is realized, but also variable bit rate (VER: Variable Bit Rate) typified by high-speed data communication in which the communication state (ON / OFF) is switched drastically and encoded and compressed moving image transmission. It is possible to flexibly deal with services, such as services, whose traffic changes drastically without a request to change the allocated line capacity.

On the other hand, the above-mentioned conventional method for changing the line allocation requires a signal for requesting line setting or release, which is a trigger for the change. In addition, since the line assignment is changed by an accurate handshake through the instruction from the base station to the slave station and the response signal from the slave station to the base station, notification of line setting completion and line release confirmation, etc. The release procedure takes a long time. Therefore AT
If an attempt is made to provide a service with drastic traffic fluctuations, such as that provided by M, by the conventional technology, there is no choice but to constantly set a fixed line, resulting in a decrease in line efficiency. become. Furthermore, since the basic processing is entirely software processing, the applicable range of the conventional method is limited to low-speed services or circuit-switched services where the traffic volume is fixed.

The present invention has been made under such circumstances, and an object of the present invention is to provide a TDMA communication system capable of speeding up and simplifying the process of setting and releasing a communication line. It is an object of the present invention to provide a TDMA communication system capable of flexibly changing the allocation state of communication lines according to the amount of data traffic. INDUSTRIAL APPLICABILITY The present invention is capable of effectively utilizing radio waves.
It is an object to provide a DMA communication system.

[0015]

According to the present invention, a base station always notifies the base station of the traffic amount of data input from a terminal device to a slave station as input traffic information, so that the base station always receives the traffic amount of all slave stations. It becomes possible for the base station to allocate lines to each slave station without requesting signals related to line setting and release.Furthermore, the line capacity can be adaptively increased or decreased during communication to improve efficiency. The main feature is that you can use the traditional communication lines.

That is, the present invention is a TDMA communication system, in which a plurality of terminal devices, a plurality of child stations respectively accommodating the plurality of terminal devices, and the plurality of child stations are connected via a communication line. And a base station, and the base station and the slave station have means for setting the communication line between the slave station and the base station according to a connection request. A feature of the present invention is that the slave station measures a quantity corresponding to traffic from a data quantity and a buffer quantity transmitted from the terminal device, and means for notifying the base station of the measurement result. The base station comprises means for adaptively allocating the communication channel in time slot units according to the notified measurement result and notifying the time slot position allocated to the slave station, and further receiving this notification. The slave station comprises means for storing its assigned time slot position and means for immediately transmitting a data signal to the assigned time slot position, the base station being capable of handling traffic arriving from the slave station. Means for monitoring the corresponding quantity and means for allocating a new time slot to the slave station when the time slot is insufficient as a result of the monitoring , Certain assigned time slots located in place and means for notifying to the slave station.

Since the TDMA communication system of the present invention does not require a procedure such as a line setting request, a line allocation instruction, and a line setting confirmation, time slots can be allocated at high speed. Therefore, the variable bit rate (VER: Variable
It is possible to flexibly support services such as Bit Rate services, where traffic changes drastically without requesting changes in allocated bandwidth.

Further, it is preferable that the slave station is provided with means for decreasing the number of time slots to be used among the allocated time slots according to the decrease in the amount of data to be transmitted.

With respect to the time slot release processing, according to the present invention, the procedures such as release request, release instruction, release confirmation, etc. are not required, so that the time slot can be increased or decreased at high speed.

Further, it is preferable that the slave station is provided with means for autonomously deleting, from the means for storing the time slot position, a time slot which is not used for n frames among the time slots assigned to the slave station. . As a result, the base station can secure a time slot for allocating a newly generated data signal without waste, and can effectively use the time slot.

Further, the base station is provided with means for canceling the allocation of the time slot when the data signal does not arrive in the time slot continuously for m frames (m is an integer of 1 or more). You can also Alternatively, the base station includes means for notifying the slave station of the reception result (ACK or NAK different) of the data signal transmitted from the slave station to which the time slot is allocated, and the slave station includes Means for autonomously storing the time slot position of the time slot when the reception result arriving from the notification means is negative p times consecutively for one time slot (p is an integer of 1 or more) It is also possible to adopt a configuration including a means for deleting from.

According to these configurations, it is possible to avoid a situation in which, when data is temporarily interrupted under an unforeseen situation, this is judged as the end of communication and the time slot is released. In this case, it is preferable that the values of n, m, and p are set to optimal values in advance according to the communication situation.

The base station includes means for notifying the slave station of the reception result of each time slot of the data signal transmitted from the slave station to which the time slot is assigned, and the slave station has a bit string of the reception result. It is desirable to include a logical operation means for changing the means for recording as and storing the time slot position. This logical operation means is means for recording the reception result as a bit string over a plurality of consecutive frames, and means for taking the logical sum of the bit strings for the corresponding time slots of the plurality of frames,
It is preferable to include means for taking a logical product of the corresponding time slot of the table as a means for storing the logical sum and the time slot position. Furthermore, this logical operation means is
A means for taking a logical sum of corresponding time slots of the logical product and new allocation information in which a time slot for newly acquiring an allocation is represented by a bit string for one frame, and replacing the logical sum with the table. Good.

According to this, the slave station can easily transmit data according to this table. Also,
By performing a logical operation on a bit string, it is possible to manage time slots by hardware processing.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION

[0026]

【Example】

(First Embodiment) The structure of the first embodiment of the present invention will be described with reference to FIGS. The overall configuration of the TDMA communication system is the same as that of the conventional example shown in FIG. Also, TDMA
The frame configuration is also the same as that of FIG. 19 described in the conventional example. The characteristic configuration of the present invention shown in FIGS.
To 14 and the base station 11. FIG. 1 is a block diagram of the TDMA device on the slave station side according to the first embodiment of the present invention. FIG. 2 shows the TDMA on the base station side according to the first embodiment of the present invention.
It is a block diagram of an apparatus. FIG. 3 is a block diagram showing the main part of the line control unit on the base station side according to the first embodiment of the present invention.
Here, an example using a wireless line will be described.

The present invention is a TDMA communication system, in which terminal devices 16 to 18, slave stations 12 to 14 in which the terminal devices 16 to 18 are accommodated, and the slave stations 12 to 14 via wireless lines. With one base station 11 connected,
In the base station 11 and the slave stations 12 to 14, the TDMA device 10 as means for setting the wireless line between the slave stations 12 to 14 and the base station 11 according to the connection request.
It is a TDMA communication system including M and 10B.

Here, a feature of the present invention is that the slave stations 12 to 14 input traffic as means for measuring the amount corresponding to the traffic from the amount of data and the amount of buffer transmitted from the terminal devices 16 to 18. The measuring unit 60M and the input traffic monitoring unit 61M, and the line control unit 39M as means for notifying the base station 11 of the measurement result are provided, and the base station 11 performs the above-mentioned measurement in units of time slots according to the notified measurement result. An allocation processing unit 50 of the line control unit 39B is provided as means for adaptively allocating wireless channels and notifying the time slot positions allocated to the slave stations 12 to 14, and further, the slave station 12 receiving this notification.
.About.14 are provided with a table 40 as means for storing the assigned time slot position and a line control unit 39M as means for immediately transmitting a data signal to the assigned time slot position. , A means for allocating a new time slot to the slave stations 12 to 14 when the line controller 39B monitors the amount of traffic corresponding to the traffic coming from the slave stations 12 to 14, and when the time slot becomes short as a result of the monitoring. The allocation processing unit 50 is provided with means for notifying the slave station of the time slot position.

Next, the operation of the first embodiment of the present invention will be described. In the TDMA device shown in FIGS. 1 and 2, general data is sent to the input traffic measuring units 60M and 60B via the input units 30M and 30B, and the traffic amount input here is measured. Input traffic measurement unit 6
The amount of data flowing into the buffer memories 31M and 31B for each TDMA frame measured at 0M and 60B and the amount of untransmitted data accumulated in the buffer memories 31M and 31B are determined by the input traffic monitoring unit 61M.
And 61B, and the result is monitored by the line controller 3.
9M and 39B are notified. The data that has passed through the input traffic measuring units 60M and 60B is temporarily stored in the buffer memories 31M and 31B, and the read data has the preamble output from the preamble generating units 32M and 32B as the TDMA frame generating unit 33.
M and 33B, and the transmitters 34M and 34
It is modulated by B and transmitted.

When the slave stations 21 to 14 transmit to the assigned user information channels 27 to 29 in the TDMA frame, the transmission is controlled by the line controller 39M. When the line control signal is output, the TDMA frame generation unit 33M adds a preamble to the line control signal generated by the line control unit 39M instead of the above-mentioned input data, and then passes through the transmission unit 34M. To send.

On the other hand, the received signals are demodulated by the receiving units 35M and 35B, the preambles are removed by the TDMA frame decomposing units 36M and 36B, the line control information is sent to the line control units 39M and 39B, and the user information is It is sent to the user information processing units 37M and 37B. This operation is controlled by the line control units 39M and 39B. After that, the user information sent to the user information processing units 37M and 37B is output via the output units 38M and 38B.

Here, regarding the processing of the input traffic information, which is the information measured by the monitors in the input traffic monitoring units 61M and 61B, the slave stations 12 to 14 are once accommodated in the line control unit 39M, In the case of the base station 11, if the base station 11 receives the input traffic information received from the slave station and the input traffic information of its own station together, the allocation processing unit 50 uses the information to collect the input traffic information. The required bandwidth of the stations 12 to 14 is calculated and assigned.

FIG. 4 shows a sequence diagram of the line setting process in the first embodiment of the present invention. Here, the line allocation period is the TDMA frame period. When data is input from the terminal devices 16 to 18, the slave stations 12 to 14 notify the base station 11 of the amount of input traffic and the amount of data stored in the buffer memory 31M of the own station, based on the input traffic information. The allocation processing unit 50 of the base station 11 determines whether or not the line capacity allocated to each slave station 12-14 is appropriate based on the traffic information input from each slave station 12-14. If there is a shortage, a time slot, that is, an instruction for additional allocation of user information channels 27-29 is used as new line allocation information for each slave station 12-1.
Notify 4. Each of the slave stations 12 to 14 transmits the data in the buffer memory 31M to the base station 11 according to the allocation by the base station 11. In the first embodiment of the present invention, since bandwidth is assigned using the input traffic information,
Even if the input traffic amount fluctuates during communication, the number of assigned user information channels can be changed by following the fluctuation.

(Second Embodiment) FIG. 5 is a sequence diagram of a user information channel release process according to the second embodiment of the present invention.
The user information channel is synonymous with a time slot in the TDMA system. Although the second embodiment will be described here, it can be used in combination with the first embodiment. First, it is assumed that the user information channels 27 to 29 are once set between the slave stations 12 to 14 and the base station 11 by the procedure described in the first embodiment of the present invention. The slave stations 12 to 14 transmit the data when the data is input from the terminal devices 16 to 18. However, when the data from the terminal devices 16 to 18 ends and there is no more data to be transmitted, the data transmission is stopped and the user information channels 27 to 29 are released autonomously.
At this time, any method can be used for the notification of the release of the user information channels 27 to 29 from the slave stations 12 to 14 to the base station 11. In FIG. 5,
At the base station 11, the base station 1
The allocation processing unit 50 of No. 1 detects the release of the user information channels 27 to 29.

(Third Embodiment) FIG. 6 is a block diagram showing the main part of the line controller 39M on the slave station side according to the third embodiment of the present invention. The slave stations 12 to 14 are provided in the line control unit 39M in the functional block configuration diagram of the TDMA device 10M of FIG.
As shown in, each of the user information channels 27 to 29 has a first counter 1 which counts the number of times transmission is continuously stopped at a constant line allocation period, and the value of the counter 1 is a preset value. And the corresponding user information channel is released. The processing of the counter 1 will be described.

FIG. 7 shows a processing flow of the counter 1 in the third embodiment of the present invention. In FIG. 7, the value of the counter 1 for the i-th user information channel (i) is A (i)
And the set value for release is a. First, child station 1
2 to 14 and the base station 11, once the user information channel (i) is processed by the procedure as described in the first embodiment of the present invention.
Is set. The slave stations 12 to 14 have a counter 1 for each of the user information channels 27 to 29, detect the input of data from the terminal devices 16 to 18 (70), and respond to the user information channel (i) from the terminal devices 16 to 18. When data is input (71), the data is transmitted and the counter 1 is reset (72). However, when the data from the terminal devices 16 to 18 is terminated or decreased and there is no more data to be transmitted to the user information channel (i) (71), the data transmission is stopped and the counter 1 is counted up. Yes (73). When the value A (i) of the counter 1 for the user information channel (i) is less than the set value a for release (74), the slave stations 12 to 14 continue the communication and the counter 1 for the user information channel (i). When the value A (i) of A reaches the set value a for release (74), the corresponding user information channel (i) is released (75).

The allocation processing units 50 of the slave stations 12 to 14 detect the release of the user information channels 27 to 29 and release the user information channels 27 to 29.

(Fourth Embodiment) FIG. 8 shows the block configuration of the line controller 39M on the slave station side according to the fourth embodiment of the present invention. In the fourth embodiment of the present invention, as shown in FIG. 8, the line control unit 39M on the slave station side is provided with the second counter 2. In order to explain the fourth embodiment of the present invention, a signal for transmitting the reception status of the base station 11 to the slave stations 12 to 14 will be referred to as reception status information. The counter 2 is provided for each of the user information channels 27 to 29 and counts up or resets at a constant line allocation period. When the value of the counter 2 reaches a preset value, the corresponding user information channel is released. The processing of the counter 2 will be described.

FIG. 9 is a diagram showing a processing flow of the counter 2 in the fourth embodiment of the present invention. In FIG. 9, the value of the counter 2 for the i-th user information channel (i) is represented by B (i), and the set value for release is b. First, it is assumed that the user information channel (i) is once set between the slave stations 12 to 14 and the base station 11 by the procedure as described in the first embodiment of the present invention. Upon receiving the data, the base station 11 transmits a signal ACK indicating successful reception to the slave stations 12 to 14 as reception status information indicating that. When the data cannot be received, the signal NAK indicating the reception failure is transmitted to the slave stations 12-14. Each of the slave stations 12 to 14 has a counter 2 for each of the user information channels 27 to 29 and receives this reception status information (8
0), when ACK is received (81), the counter 2 is reset (82). When NAK is received or AC
When K cannot be received due to a code error on the transmission path or the like (81), the counter 2 is incremented (83). If the value B (i) of the counter 2 for the user information channel (i) is less than the set value b for release (84), the slave station continues communication and the value B of the counter 2 for the user information channel (i) is B. When (i) reaches the set value b for release (84), the corresponding user information channel (i) is released (85).

Further, the slave stations 12 to 14 in the base station 11
Regarding the detection of the release of the user information channels 27 to 29, the allocation processing unit 50 of the base station 11 counts the number of continuous transmissions of NAK for the user information channel (i) to ensure the corresponding user information. You can know the release of the channel.

(Fifth Embodiment) FIG. 10 shows a block diagram of a line controller 39B on the base station side according to a fifth embodiment of the present invention. The base station 11 includes, in the line control unit 39B of the TDMA device 10B, a third counter 3 for counting the number of times data has not been continuously received at a constant line allocation period for each user information channel 27-. 29, and when the value of the counter 3 reaches a preset value, the corresponding user information channels 27 to 29 are released. The processing of the counter 3 will be described. FIG. 11 shows a processing flow of the counter 3 in the fifth embodiment of the present invention.

In FIG. 10, the value of the counter 3 for the i-th user information channel (i) is represented by C (i), and the set value for release is c. First, the slave station 12-
It is assumed that the user information channel (i) is once set up between 14 and the base station 11 by the procedure as described in the first embodiment of the present invention. The base station 11 has a counter 3 for each of the user information channels 27-29, and has slave stations 12-14.
User data channel 27 to
Whether it is received or not is detected for each 29 (90), and when the reception state is reception (91), the counter 3 is reset (92). When the reception state is not received (91), the counter 3 is incremented (93).
Value C of counter 3 for user information channel (i)
When (i) is less than the set value c for release (94), the base station 11 continues communication, and the value C (i) of the counter 1 for the user information channel (i) is set value c for release.
If (94) is reached, the corresponding user information channel (i) is released (95).

At this time, the base station 1 in the slave stations 12 to 14
Although any method can be used to detect the release of the user information channels 27 to 29 in No. 1, the counter 1 or the counter 2 used in the third embodiment of the present invention and the fourth embodiment of the present invention is used. The specific example in which the slave stations 12 to 14 release the user information channels 27 to 29 will be described below.

First, the case where the slave station has the counter 1 and the base station has the counter 3 in order to release the line will be described. FIG. 12 shows a sequence diagram of the release processing of the user information channels 27 to 29 in the fifth embodiment of the present invention. Here, for simplification of description, a case where “3” is selected as the set value of the counter 1 and the counter 3 for releasing the user information channels 27 to 29 will be specifically described.

It is assumed that user information channels 27 to 29 are once set between the slave stations 12 to 14 and the base station 11 by the procedure described in the first embodiment of the present invention, and the slave stations 12 to 14 are set. Is counter 1 and base station 11 is counter 3
have. In addition, the line allocation period is the TDMA frame period. When data is input from the terminal devices 16 to 18, the slave stations 12 to 14 transmit the data. However, when the data from the terminal devices 16 to 18 is completed and there is no more data to be transmitted, the data transmission is stopped and the counter 1 relating to the number of times of non-transmission of data owned by the own station is counted up. If the base station does not receive data, the base station 11
The counter 3 relating to the number of times data has been received has been incremented. Even if data is not transmitted, if the counter values of the slave stations 12 to 14 and the base station 11 are less than the initially set number “3”, the user information channels 27 to 29 remain set. is there. But,
User information channel 27 to 27 set between the slave stations 12 to 14 and the base station 11 due to the third data non-transmission
29 is released.

In the above description, the case where the user information used is one has been described. When a plurality of user information channels are used, it is possible to release only unnecessary user information channels by a method similar to the above procedure as the amount of input traffic decreases. This corresponds to the processing for reducing the allocated line capacity described in the first embodiment of the present invention.

(Sixth Embodiment) Next, a case will be described in which the slave stations 12 to 14 have the counter 2 and the base station 11 has the counter 3 in order to release the line. This sixth embodiment can be used by combining the above-mentioned embodiments. In FIG.
The sequence diagram of the release processing of the user information channels 27-29 due to the reception state information (ACK) unreceived accompanying the data transmission stop of the slave stations 12-14 in the sixth embodiment of the present invention is shown. Here, for simplification of description, a case where “3” is selected as the set value of the counter 2 and the counter 3 for releasing the user information channels 27 to 29 will be specifically described. The slave stations 12 to 14 are terminal devices 16 to 1.
When the data is input from 8, the data is transmitted. However, when the data from the terminal devices 16 to 18 is finished and there is no data to be transmitted, the data transmission is stopped. As a result, the base station 11 cannot receive the data, and transmits the reception failure, that is, NAK, to the slave stations 12 to 14 as the reception status information. Child station 12-
At 14, the reception state information NAK is received, and the number of consecutive times is counted by the counter 2. If this counter value is less than the predetermined number of times "3", data can be transmitted normally, but when the set number of times reaches three times due to continuous non-receipt of ACK, the data for the corresponding user information channel is transmitted. Stop sending and release.

When confirming the reception status of data from the slave stations 12 to 14, the base station 11 counts up the counter 3 of its own station if no data is received. When this counter value reaches “3” a predetermined number of times, the base station 11 determines that the user information channels 27-
29 release processing is performed. The user information channel 27
The predetermined counter values of the slave stations 12 to 14 and the base station 11 which are set for the release of the slave stations 12 to 14 are
And the base station 11 are set to the same value.

Subsequently, the slave stations 12 to 14 set the counter 2
A case where the base station 11 has the counter 3 will be described.
FIG. 14 shows reception status information (AC) according to the sixth embodiment of the present invention.
K) shows a sequence diagram of a process of releasing the user information channels 27 to 29 due to non-reception. Here, for simplification of explanation, the case where "3" is selected as the set value of the counter 2 and the counter 3 for releasing the line will be specifically described.

When the base station 11 receives the data, the success of reception, that is, ACK, is received by the slave station 1 as reception status information indicating that.
2 to 14 are transmitted. Further, when the data cannot be received, reception failure, that is, NAK, is transmitted to the slave stations 12 to 14 as reception status information indicating that. When the slave stations 12 to 14 receive this reception status information and receive NAK or cannot receive ACK due to a code error on the transmission path or the like, the number of consecutive ACK receptions is not performed. The counter 2 counts. If this counter value is less than the predetermined number of times "3", data can be transmitted normally, but continuous ACK
When the set number of times reaches three times due to non-reception, data transmission to any one of the user information channels 27 to 29 concerned is stopped and released.

Similarly to the above, the base station 11 counts up the counter 3 of its own station when data is not received when confirming the reception status of data from the slave stations 12-14. To do. When this counter value reaches “3” a predetermined number of times, the base station 11 performs the release process of the user information channels 27 to 29. The slave station 12 set for releasing the user information channels 27 to 29
˜14 and the base station 11 have a predetermined counter value, the slave stations 12 to 14 and the base station 11 are set to the same value.

Further, FIG. 15 shows a sequence diagram for forcibly releasing the user information channels 27 to 29 by transmitting NAK as the reception state information in the sixth embodiment of the present invention. Here, for convenience of explanation, an example will be described in which the set value of the counter is set to three times.

Normally, when the base station 11 receives data, it indicates to the slave stations 12 to 14 as reception status information A indicating reception.
Send CK. However, for some reason, the base station 1
In No. 1, when a request for releasing the user information channel being used occurs, the base station 11 transmits reception state information NAK indicating that data has not been received to the slave stations 12 to 14. In the base station 11, it is assumed that data reception for the corresponding user information channel has not been received,
The number of consecutive transmissions of this NAK is counted by the counter 3,
When the set number of times is reached, the corresponding user information channel is released. When the slave stations 12 to 14 do not receive the ACK, the number of consecutive times is counted by the counter 2, and when the set number of times is reached, the corresponding user information channel is released and data is transmitted. Stop.

(Seventh Embodiment) As shown in FIG. 1, each of the slave stations 12 to 14 has a table 40 in which a user information channel in a TDMA frame assigned to itself is described by ON / OFF of bits.

FIG. 16 shows a procedure for updating the allocation data table of the user information channels 27 to 29 in the seventh embodiment of the present invention. FIG. 16 shows an example in which the reception states of the user information channels 27 to 29 are recorded over 3 TDMA frames and a series of processing is performed using this for the sake of simplicity. The number of user information channels is eight.

In the table 40 shown in the TDMA device 10M of FIG. 1, as shown in FIG. 16, a reception state information recording table 130 and a reception state information recording table 130 are provided.
OR table 131 of the above, the allocation data table 13 of the user information channels 27 to 29 in the immediately preceding frame
2. New line allocation information table 133 showing the positions of user information channels 27 to 29 that the base station newly permits the use to the slave stations, updated user information channel 2
7 to 29 allocation data tables 134 are provided. It is assumed that all of this information is described in the bit map format. In the new line allocation information and allocation data table, "1" indicates that the corresponding channel is used, "0" indicates that it is not used, and reception status information indicates " 1 "is successful reception (A
CK), and “0” indicates reception failure (NAK).

First, of the user information channels 27 to 29, it is assumed that the slave stations 12 to 14 have already been allocated the two user information channels No. 2 and No. 6. Therefore, the slave stations 12 to 14 use the second and sixth user information channels to transmit data. on the other hand,
The base station side confirms the reception status of both user information channels and returns the reception status information to the slave station. In FIG. 16, after that, the input traffic amount increases, and the base station 11 judges that the current line capacity is insufficient and instructs the new line allocation information table 133 to newly allocate the first user information channel. Is issued.

As an operation for updating the allocation table, the logical sum of the bits for each burst in the reception status information is calculated and a logical sum table 131 of the reception status information is created. Next, a logical product is calculated between the allocation data table 132 and the logical sum table 131 of the reception status information, and it is determined whether or not the user information channel currently allocated is continuously used. Furthermore, the new allocation data table 134 showing the user information channel to be used in the next TDMA frame is updated by taking the logical sum of the operation result of this logical product and the bit for each burst of the new line allocation information table 133. To do. By this operation, 1
A new allocation data table 134 for allocating the No. 2, No. 6 and No. 6 user information channels is created.

It should be noted that only one example of the method of updating the user information channel allocation table is shown, and a method of omitting the reception status information or a method of updating the past history of these information may be considered. Also, here, the case where all of the allocation data table, the reception status information, and the new line allocation information are expressed in the bitmap format has been described, but if they are described in different formats, the expression like this time is used once. Similar processing can be performed by performing the processing after conversion.

(Eighth Embodiment) FIG. 17 shows the eighth embodiment of the present invention.
This will be described with reference to FIG. FIG. 17 shows the TD of the eighth embodiment of the present invention.
It is the whole MA communication system lineblock diagram. The eighth embodiment of the present invention is the TDMA described in the first to seventh embodiments of the present invention.
The communication method is realized by using a wired line. The terminal devices 16 to 18 are housed in the slave stations 141 to 143, respectively, and the slave stations 141 to 143 are connected to the base station 140 via the optical fiber 144 and the omnidirectional coupler 145. In this omnidirectional coupler 145, all wavelengths are supplied to all branch paths. TDM using the above-mentioned wireless line
The A communication method can be similarly described in the TDMA communication method using this wired line.

(Summary of Embodiments) According to the first to sixth embodiments of the present invention, in the access system for wide band, variable capacity communication, the base station 11 moves from the terminal devices 16 to 18 to the slave stations 12 to 1.
The line capacity is set according to the traffic volume input to the network 4, and the line capacity is changed in real time according to the change in the input traffic volume, so that an efficient communication line can be used. Further, even if there is a drastic traffic fluctuation due to the line release due to the autonomous transmission stop due to the completion of the data transmission of the slave stations 12 to 14 and the autonomous increase or decrease of the line capacity due to the reduction of the data amount of the slave stations 12 to 14, it is efficient. It is possible to manage communication line resources. Furthermore, by making the processing at the time of line setting hardware processing and simplifying the conventional handshake, the connection delay required for line setting can be greatly shortened,
In addition, the line release procedure can be greatly simplified. The simplification of these controls has the effects of reducing the load on the base station and reducing the hardware scale, as well as supporting high-speed processing. In addition, by setting the appropriate counter settings in the base station and slave stations to release the line and reduce the line capacity, high line use efficiency, stability against control information loss, and suppression of delay occurrence due to control information loss The effect can be realized.

As described above, as a multiple access system other than the TDMA communication system described in the first to sixth embodiments of the present invention,
Frequency Division Multiple Access (FDMA)
Access) method, code division multiple access (CDMA: Code Division
A multiple access method or the like can be used, but the line allocation processing is the same as in the case of the TDMA communication method. Also,
Even when the wired line shown in FIG. 17 is used, it is possible to perform the same processing as the above-described method by simply combining or distributing the signals in the base station.

[0063]

As described above, according to the present invention,
It is possible to speed up and simplify the process of setting and releasing the communication line. As a result, it is possible to flexibly change the allocation state of the communication line according to the traffic volume of data. In addition, effective use of radio waves can be achieved.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a TDMA device on a slave station side according to a first embodiment of the present invention.

FIG. 2 is a block configuration diagram of a TDMA device on the base station side according to the first embodiment of the present invention.

FIG. 3 is a block diagram of a main part of a line controller on the base station side according to the first embodiment of the present invention.

FIG. 4 is a sequence diagram of a line setting process in the first embodiment of the present invention.

FIG. 5 is a sequence diagram of a user information channel release process according to the second embodiment of the present invention.

FIG. 6 is a block diagram showing the main part of a line control unit on the slave station side according to the third embodiment of the present invention.

FIG. 7 is a diagram showing a processing flow of a counter in the third embodiment of the present invention.

FIG. 8 is a block configuration diagram of a line controller on a slave station side according to a fourth embodiment of the present invention.

FIG. 9 is a diagram showing a processing flow of a counter in the fourth embodiment of the present invention.

FIG. 10 is a block configuration diagram of a line controller on the base station side of a fifth embodiment of the present invention.

FIG. 11 is a diagram showing a processing flow of a counter in the fifth embodiment of the present invention.

FIG. 12 is a sequence diagram of a user information channel release process in the fifth embodiment of the present invention.

FIG. 13 is a sequence diagram of a user information channel release process due to the reception of the reception status information due to the data transmission stop of the slave station in the sixth embodiment of the present invention.

FIG. 14 is a sequence diagram of a user information channel release process due to reception of reception status information in the sixth embodiment of the present invention.

FIG. 15 is a sequence diagram of forced release of a user information channel by transmitting NAK as reception status information in the sixth embodiment of the present invention.

FIG. 16 is a diagram showing a procedure for updating a user information channel allocation data table in the seventh embodiment of the present invention.

FIG. 17 is an overall configuration diagram of a TDMA communication system according to an eighth embodiment of the present invention.

FIG. 18 is an overall configuration diagram of a DA-TDMA communication system.

FIG. 19 is a configuration diagram of a TDMA frame.

FIG. 20 is a diagram illustrating a TD provided in a slave station and a base station of a conventional example.
The block block diagram of MA apparatus.

FIG. 21 is a sequence diagram of a line setting process in a conventional TDMA communication system.

FIG. 22 is a sequence diagram of line release processing in the conventional TDMA communication system.

[Explanation of symbols]

 1, 2 and 3 counter 4 reception state determination unit 10, 10M, 10B TDMA device 11, 140 base station 12 to 14, 141 to 143 slave station 16 to 18 terminal device 19 control signal unit 20 data burst unit 21 to 23 base station Control channel 24-26 Slave station control channel 27-29 User information channel 30, 30M, 30B Input unit 31, 31M, 31B Buffer memory 32, 32M, 32B Preamble generation unit 33, 33M, 33B TDMA frame generation unit 34, 34M, 34B transmitting unit 35, 35M, 35B receiving unit 36, 36M, 36B TDMA frame disassembling unit 37, 37M, 37B user information processing unit 38, 38M, 38B output unit 39, 39M, 39B line control unit 40 table 50 allocation processing unit 60M , 60B input traffic measurement unit 1M, 61B input traffic monitoring unit 130 receives the state information table 131 logical sum table 132 allocated data table 133 new line of the received status information assignment information table 134 newly allocated data table 144 optical fiber 145 omnidirectional coupler

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masahiro Umehira 3-19-3 Nishishinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation

Claims (8)

[Claims] 1. A plurality of terminal devices, a plurality of child stations respectively accommodating the plurality of terminal devices, and one base station connected to the plurality of child stations via a communication line, In the TDMA communication system, in which the base station and the slave station have means for setting the communication line between the slave station and the base station according to a connection request, the slave station is configured to transmit data transmitted from the terminal device. A means for measuring the amount corresponding to traffic from the amount and the buffer amount, and means for notifying the base station of the measurement result, the base station, the communication in a time slot unit according to the notified measurement result A means for adaptively allocating the line and notifying the time slot position assigned to the slave station is provided, and the slave station receiving this notification is assigned to the allocated time slot. Means for storing a traffic position and means for immediately transmitting a data signal to the allocated time slot position, the base station monitoring means for monitoring the amount of traffic coming from the slave station, and A TDMA communication system comprising means for newly allocating a time slot to the slave station when the time slots are insufficient as a result of monitoring, and means for notifying the slave station of the allocated time slot position. 2. The TDMA communication according to claim 1, wherein the slave station is provided with means for autonomously decreasing the number of time slots to be used among the allocated time slots according to a decrease in the amount of data to be transmitted. method. 3. The slave station comprises means for autonomously deleting, from the means for storing the time slot position, a time slot that is unused for n frames among the time slots assigned to the slave station. TD of 2
MA communication method. 4. The base station further comprises means for deallocating the time slot when a data signal does not arrive in the time slot continuously for m frames (m is an integer of 1 or more). T of 2 or 3
DMA communication system. 5. The base station comprises means for notifying the slave station of a reception result (ACK and NAK distinction) of a data signal transmitted from the slave station to which the time slot is allocated, for each slave. When the reception result arriving from the means for notifying is negative for one time slot consecutively (p is an integer of 1 or more), the station autonomously determines the time slot position. 5. The TDMA communication system according to claim 2, further comprising means for deleting from the means for storing. 6. The base station comprises means for notifying the slave station of a reception result for each time slot of a data signal transmitted from the slave station to which the time slot is assigned, and the slave station is provided with the time slot. 2. The TDMA communication system according to claim 1, further comprising a table of bit strings as means for storing the position, and logical operation means for changing the means for recording the reception result as a bit string and storing the time slot position. 7. The logical operation means records the reception result as a bit string over a plurality of consecutive frames, a means for taking a logical sum of the bit strings for corresponding time slots of the plurality of frames, and the logic. 7. The TDMA communication system according to claim 6, further comprising means for taking a logical product of a sum and a corresponding time slot of the table. 8. The logical operation means calculates a logical sum of a corresponding time slot of the logical product and new allocation information in which a time slot for newly acquiring allocation is represented by a bit string for one frame, and the logical sum thereof is obtained. 8. The T of claim 7, including means for replacing a sum with the table.
DMA communication system.