JPH10190600A - Communication control method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide communication control method and device capable of multiplex-transmitting the information of many channels in a small circuit scale in a time division manner and transferring many channel data at a low cost. SOLUTION: This communication controller operated by a TDMA-TDD system for multiplex-transmitting the information of the plural channels in the time division manner is provided with a data processing part 1 for setting data for transmission for the respective channels, a data buffer 2 for storing transmission data inputted from the data processing part 1 and outputting them to a transmission means and a transmission state detection part 7 for detecting the state of the transmission or non-transmission to a transmission part 3 for transmitting the data from the data buffer 2 toward the plural pieces of terminals. The data buffer 2 is provided with the two faces of a first data buffer 21 and a second data buffer 22 and a data transfer timing between the data buffers of the two faces is controlled based on the state information of the transmission or the non-transmission from the transmission state detection part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a TDMA / TDD.
(Time Division Multiple Access / Time Division Dup
The present invention relates to a communication control method and apparatus operated by the lex (time division multiplex access / time division multiplex) method.

[0002]

2. Description of the Related Art As a communication device operated by the TDMA / TDD system, for example, a PHS (Personal Handy Pho
A digital cordless telephone system as a wireless communication system called a ne system is known. This P
HS uses a radio signal in a frequency band of 1.9 GHz,
A base station as a wireless communication device transmits and receives a TDMA-TDD frame signal to perform wireless communication with a plurality of digital cordless telephones as mobile stations.

[0003] As this base station, what is now widely used is called the 1C + 3T type. In one base station, three channel signals for one control channel and three communication channels are used. It performs four-channel multiplex communication for controlling the operation of two communication lines, and transmits and receives data based on transmission and reception timings as shown in FIG. In recent years, in order to reduce construction costs in laying a communication line, a high traffic type called 1C + 7T type, which controls the operation of seven communication lines in one base station, or more than eight channels. What can respond to the number of lines is demanded.

In the TDMA / TDD system, one transmission line is divided into a plurality of transmission / reception channels in time and shared. Therefore, it is essential to provide a data buffer for storing data inside the base station in order to match the timing of transmission and data processing. Then, as shown in the schematic block diagram of FIG. 4, a data processing unit 1 that is a processing unit for setting transmission data for each channel and processing received data, and stores transmission data input from the data processing unit 1 and stores the transmission data in the transmission unit. A transmission buffer 2 that is a data buffer that outputs data to the transmission buffer 2, a transmission unit 3 that is a transmission unit that transmits data from the transmission buffer 2 to a plurality of terminals, and a data processing unit that stores data output from the reception unit 4. In a communication control device of a 4-channel base station including a reception buffer 5 which is a data buffer for outputting data to the transmission unit 1, a process of writing transmission data by the data processing unit 1 and a process of reading transmission data to the transmission unit 3 are described. In order to avoid data destruction due to simultaneous access in processing, as shown in FIG. 5, a transmission buffer composed of two planes for each channel is usually used. 2 is provided. Then, the data processing unit 1 performs data transmission and reception while setting transmission and reception timings.

[0005] That is, in the communication control apparatus, on the transmission side, the data that has been processed by the data processing unit 1 is temporarily stored in the data buffer area B1 on the first side of the transmission buffer 2.
1, B21, B31, and B41, and when the transmission is possible, the data buffer area B11,
B21, B31, B41 to data buffer area B1
2, data transfer to B22, B32, and B42 is performed. Then, on the receiving side, the data received from the transmission path 6 is accumulated in the reception buffer 5 until the data processing unit 1 completes other data processing, and the data is transmitted and received.

[0006]

In the case where two transmission buffers are provided for each of the above-described channels, twice as many data buffer areas as the number of channels are provided on the memory device. Therefore, in the case of an eight-channel type or a type capable of coping with a greater number of lines, there is a problem that the scale of the entire circuit becomes large. In addition, the transmission buffer is composed of only two sides, and the data write timing in the data processing unit 1 must be such that the data is always written to the first side transmission buffer in the slot immediately before the transmission timing on the transmission path. Although a method in which the data transfer between buffers is controlled for each slot s by itself is conceivable, this method requires a CPU or the like as a high-speed processing device in the data processing unit 1, and the base station needs There was a problem that the cost increased.

The present invention has been made in view of the above circumstances, and an object of the present invention is to enable time-division multiplex transmission of information of a large number of channels on a small circuit scale.
An object of the present invention is to provide a communication control method and apparatus capable of transmitting and receiving multi-channel data at low cost.

[0008]

In order to achieve the above object, a communication control method according to claim 1 is a communication control method operated by a TDMA-TDD system that multiplexes and transmits information of a plurality of channels in a time division manner. The transmission data for each channel is set and the data transfer timing between the two data buffers is controlled to a plurality of terminals while storing the data in the data buffer formed on the two surfaces. This is performed based on detection information of a state of transmission or non-transmission to a transmission unit that transmits data to the transmission unit. Thus, while the transmission data for each channel is stored in the data buffer formed by two surfaces, the control of the data transfer timing between the data buffers on the two surfaces can be performed by controlling the data transfer to a plurality of terminals. The setting is performed and performed according to the detection information of the state of transmission or non-transmission to the transmitting means for transmitting.

According to a second aspect of the present invention, there is provided a communication control apparatus for multiplexing and transmitting information of a plurality of channels by time division.
A communication control device operated by the TDD method,
A data setting unit for setting transmission data for each channel; a data buffer for storing transmission data input from the data setting unit and outputting the transmission data to the transmission unit; State detecting means for detecting a state of transmission or non-transmission to the transmitting means for transmitting data, the apparatus having two data buffers, and two planes based on state information of transmission or non-transmission from the state detecting means. Of the data transfer timing between the data buffers. Thus, the data transfer between the data buffer having two data buffers, which stores the transmission data set for each channel and outputs the data to the transmission means, which is input from the data setting means, is performed from the data buffer. Data transfer timing is controlled based on transmission or non-transmission state information from a state detection unit that detects a transmission or non-transmission state to a transmission unit that transmits data to a plurality of terminals.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a communication control method and apparatus according to the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram of a transmitting section of a communication control apparatus according to an embodiment of the present invention. FIG. 2 is an explanatory diagram of a processing procedure of the communication control device shown in FIG.

This communication control device is used, for example, in a base station in a PHS, and serves as data setting means for setting transmission data for each channel to a plurality of digital cordless telephones, which are mobile stations (not shown). It includes a corresponding data processing unit 1, a transmission buffer 2 having a first data buffer 21 and a second data buffer 22, a transmission state detection unit 7 corresponding to a state detection unit, and a transfer timing control unit 8. . The data processing unit 1 may be formed by a CPU or the like that constitutes a base station. Therefore, most of the communication control devices include a transmitting unit 3 that transmits data to a plurality of terminals and a CPU. Etc. are inserted in the data transmission path between them.

The data processing unit 1 is a CPU constituting a base station in this case, and as shown in FIG.
The TDMA-TDD frame signal output from the transmission unit 3 is set. The data processed by the data processing unit 1 is sequentially assigned to the number of the slot s for each frame f1, f2,..., And the transmission data output from the transmission unit 3 shown in FIG. After receiving data input from a receiving unit (not shown) via a receiving buffer, the data is sequentially processed. In addition, the data processing unit 1 transmits the transmission data Tx1 and Tx2 of two slots transmitted at the beginning of one frame f2, for example, so as not to overlap with the processing of the reception data. When transmitting the last transmission data Tx4 of the frame f1 of FIG.
When data is received, a data setting process is performed.

The first data buffer 21 is a first-side data buffer for storing transmission data input from the data processing unit 1. This first data buffer 21 is formed in a transmission buffer 2 set in a memory device constituting a base station, and is provided with a TDMA-TD output from a transmission unit 3.
It has a large memory capacity for storing transmission data corresponding to one slot of a D frame signal.

The second data buffer 22 is a second data buffer for storing the transmission data input from the first data buffer 21 and sequentially outputting the transmission data to the transmission unit 3 corresponding to the transmission means. The second data buffer 22 is also formed in the transmission buffer 2 set in the memory device constituting the base station, and transmits data from the first data buffer 21 to the second data buffer 22. Is controlled by a transfer timing control unit 8 described later.

The transmission state detecting section 7 detects whether or not data is actually transmitted to a slot on the transmission path. In this section, the data is transmitted from the second data buffer 22 to a plurality of terminals. To detect the state of transmission or non-transmission to the transmission unit 3 that transmits data. Then, the detection result is output to a transfer timing control unit 8 described later.

The transfer timing control unit 8 controls the timing of data transfer between the first data buffer 21 and the second data buffer 22, and based on the detection result data from the transmission state detection unit 7, 1 data buffer 2
The timing of data transmission from 1 to the second data buffer 22 is controlled. This transfer timing control unit 8
Can transfer data from the first data buffer 21 to the second data buffer 22 only when it is determined from the detection result data that the data accumulated in the second data buffer 22 is empty. I do. The data transfer control by the transfer timing control unit 8 is performed by the transmission state detection unit 7. For example, a transmission path monitoring unit that monitors a transmission path in wired communication, and a control for performing transmission in wireless communication. It can also be realized by a signal detecting means or the like for detecting a signal when the CPU in the station performs the operation.

Next, a communication control method by the communication control device described above will be described with reference to FIG.

First, the data processing unit 1 transmits transmission data Tx1 and Tx2 of two slots transmitted at the beginning of one frame f2 based on a TDMA-TDD frame signal, for transmission data for each channel. Frame f
This is set when transmitting the last transmission data Tx4 and receiving the first reception data Rx1 of the frame f1 before the second frame f1. The transmission data is sequentially output to the first data buffer 21. Here, the transmission data T
In the slot s in which x1 is set, the transmission data Tx4
Is transmitted from the first data buffer 21 to the second data buffer 22 by the transfer timing control unit 8 which has obtained the detection result from the transmission state detection unit 7 at the stage when this transmission is completed. Is transmitted, and the transmission data Tx2 for which setting is performed in the next slot is performed.
Can be avoided. Next, the data processing unit 1 receives the reception data Rx input from the reception buffer.
1, Rx2, and Rx3 are sequentially processed. At this time, the transmission state detection unit 7 detects a non-transmission state in which the transmission data is not transmitted to the transmission unit 3; Tx2 first data buffer 2
The transfer from 1 to the second data buffer 22 is not performed.
Then, the transmission data Tx1 and Tx2 are sequentially output from the second data buffer 22 to the transmission unit 3, and the data processing unit 1 sequentially sets the transmission data Tx3 and Tx4 and sequentially outputs the data to the first data buffer 21. .

In the above method, the timing of data writing in the data processing unit 1 is limited, and data is always written to the first data buffer 21 in the slot immediately before the transmission timing on the transmission line. When data transfer is sequentially performed in a configuration having only transmission buffers, as shown in FIG. 2B, specific slots P, P ... Thus, the data processing unit 1 does not require a CPU or the like as a high-speed processing device, and a base station can be realized at low cost.

According to the communication control device described above, the data processing unit 1 sets transmission data for each channel, accumulates transmission data input from the data processing unit 1, and outputs the data to the transmission unit. A data buffer 2 having two data buffers transmits or receives signals from a transmission state detector 7 which detects a state of transmission or non-transmission to a transmitter 2 which transmits data from the data buffer 2 to a plurality of terminals. Since the data transfer timing between the two data buffers is controlled based on the transmission status information, information on a large number of channels can be multiplexed and transmitted in a small circuit scale in a time-division manner. To send and receive multi-channel data.

[0022]

According to the communication control method or apparatus of the present invention, the data setting means sets the transmission data for each channel, stores the transmission data input from the data setting means, and sends the data to the transmission means. An output data buffer having two data buffers is provided for transmitting or not transmitting from a state detecting means for detecting a transmitting or non-transmitting state to a transmitting means for transmitting data from the data buffer to a plurality of terminals. Since the data transfer timing between the two data buffers is controlled based on the state information, information of a large number of channels can be multiplexed and transmitted in a small circuit scale in a time-division manner. Can transmit and receive channel data.

[Brief description of the drawings]

FIG. 1 is a block diagram of a transmission unit of a communication control device according to an embodiment of the present invention.

FIGS. 2A and 2B are explanatory diagrams of a processing procedure of the communication control device, wherein FIG. 2A shows a case of the communication control device shown in FIG. 1, and FIG. 2B shows a case where transfer timing control between buffers is not performed;

FIG. 3 is an explanatory diagram of transmission / reception timing of a TDMA-TDD frame signal.

FIG. 4 is an overall block configuration diagram of the communication control device.

FIG. 5 is an explanatory diagram of a conventional transmission buffer.

[Explanation of symbols]

 Reference Signs List 1 data processing unit (data setting unit) 2 transmission buffer 21 first data buffer (data buffer) 22 second data buffer (data buffer) 3 transmission unit (transmission unit) 7 transmission state detection unit (state detection unit)

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Atsushi Okita 1048 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Works, Ltd.

Claims (2)

[Claims] 1. A communication control method operated by a TDMA-TDD method in which information of a plurality of channels is multiplexed and transmitted in a time-division manner, wherein transmission data for each channel is set and formed on two surfaces. Controlling the data transfer timing between the two data buffers while storing the data in the data buffer
A communication control method, which is performed based on detection information of a state of transmission or non-transmission to a transmission unit that transmits data to a plurality of terminals. 2. A communication control device operated by a TDMA-TDD system for multiplexing transmission of information of a plurality of channels in a time-division manner, comprising: data setting means for setting transmission data for each channel; A data buffer for storing transmission data input from the setting means and outputting the data to the transmission means, and a state detection for detecting a transmission or non-transmission state of the transmission means for transmitting data from the data buffer to a plurality of terminals; Means for controlling the data transfer timing between the two data buffers based on transmission or non-transmission state information from the state detection means. Control device.