JPH089466A - Slot interrupting device - Google Patents

Abstract

PURPOSE:To efficiently control a digital cordless telephone system of a TDMA system for the unit of a slot as the minimum unit of.information communication. CONSTITUTION:The partition of respective transmission slots is detected and a transmission slot interrupt signal is outputted by a transmission timing means 1 of the slot interrupting device provided at a base station connected with a mobile equipment for radio communication. Then, the partition of respective reception slots is detected and a reception slot interrupt signal is outputted by a reception timing means 1. These interrupt signals are inputted to a processing means 5 for system control, interruption is loaded, a slot identification signal for uniquely identifying the respective slots is outputted by a slot identifying means 1, the unique word of the reception slot is detected by a unique word detecting means 14, a unique word detect signal is outputted, the transmission error of the reception slot is detected by an error detecting means 15 and an error detect signal is outputted. Then, the slot and these signals showing its transmitting state are inputted to the processing means 5, and the system is efficiently controlled for the unit of a slot.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cordless telephone system for connecting a base station and a mobile device by radio communication, and more particularly to a slot interrupt device for detecting each slot in the TDMA communication system for system control. Regarding

[0002]

2. Description of the Related Art A cordless telephone is a mobile device (portable terminal).
It is a telephone communication system in which a base station and a base station are connected by wireless communication. At present, an analog system is widely used. Here, in recent years, digitalization of the cordless telephone system has been performed in order to cope with the increase in the number of subscribers, high confidentiality performance, reduction of base station cost, improvement of call quality, etc. Is being studied. In such a digital cordless telephone (so-called personal handy phone), a multi-channel T is used as a communication method in order to improve the efficiency of wireless line control.
DMA (Time Division Multipl)
ex Access: time division multiple access) method is adopted.

In the multi-channel TDMA system, transmission and reception are carried out between a base station and a mobile device on one radio channel, and transmission and reception are performed in a TDMA frame which is the basis of transmission and reception for each mobile device. And a pair of time zones (slot)
Is assigned to send and receive information. For example, in the 4-channel TDMA system, a frame composed of a total of 8 slots allocated to each of four mobile units for transmission and reception is used as a basis for transmission and reception between the base station and the mobile unit.

[0004]

Here, in the cordless telephone system, it is possible to efficiently perform system control such as frame synchronization, slot transmission error control, and interference monitoring with other radios at the base station. Required. In particular, in a multi-channel TDMA digital cordless telephone system, it is strongly desired to carry out fine system control in order to exert the above advantages. The present invention has been made in view of the above-described conventional circumstances, and an object of the present invention is to detect slots, which are the minimum units of information communication, in a TDMA type digital cordless telephone system, thereby realizing efficient system control. I am trying.

[0005]

Therefore, in order to achieve the above object, a slot interrupt device of the present invention is provided in a base station connected to a mobile device by radio communication according to the TDMA system, and is provided in each TDMA frame. In a slot interrupt device for detecting slots, a transmission timing means for detecting a break of each transmission slot and outputting a transmission slot interrupt signal, and a reception for detecting a break of each receiving slot and outputting a reception slot interrupt signal Timing means, slot identification means for outputting a slot identification signal for uniquely identifying each slot, unique word detection means for detecting a unique word of a reception slot and outputting a unique word detection signal, and transmission error of a reception slot The error detection means for detecting and outputting an error detection signal and the processing means for controlling the system are provided with the slot. Input means for inputting an identification signal, the unique word detection signal and the error detection signal,
An interrupt control means for inputting the transmission slot interrupt signal and the reception slot interrupt signal to the processing means to interrupt the processing means.

[0006]

According to the slot interrupt device of the present invention having the above-described structure, the processing means transmits or receives by inputting the transmission slot interrupt signal or the reception slot interrupt signal in the transmission and reception with the mobile station at the base station. An interrupt is issued at each slot delimiter, and system control can be performed at each timing. Then, at this interrupt, the slot identification signal, the unique word detection signal and the transmission error detection signal are also input to the processing means, and the processing means can perform the transmission / reception state and further the system control corresponding to each mobile unit.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A slot interrupt device according to an embodiment of the present invention will be described below with reference to the drawings. The base station wirelessly communicates with the mobile device using the transmission or reception slot assigned in the frame, and the slot interrupt device according to the present embodiment is provided on the base station side. First, the structure of frames and slots will be described. As shown in FIG. 4, one frame is composed of eight slots (transmission 1 to 4, reception 1 to 4), and a pair of slots (transmission 1 and reception 1 , Transmission 2 and reception 2, transmission 3 and reception 3, transmission 4 and reception 4) are assigned as transmission slots and reception slots to four mobile units, respectively.

As shown in FIG. 2, there are two types of transmission slots, a control slot and a communication slot, and both slots have roughly the same structure. That is, the transmission slot includes a ramp time portion (R) for guaranteeing the rise of a burst, a start symbol portion (SS) for indicating the start of a signal, a preamble portion (PR) for establishing bit synchronization, and a frame. Unique word part (UW) for establishing synchronization, identification bit part (CI) for channel identification, data part (D) for transmitting control information, voice data, etc., for error check for controlling transmission error It is composed of a bit part (CRC). The numbers attached in the figure indicate the number of bits in each part, especially the unique word part (UW).
Defines different patterns of 32 bits and 16 bits for the control slot and the communication slot.

As shown in FIG. 3, there are two types of receiving slots, that is, a control slot and a communication slot. Each of the slots roughly has the same structure as the transmission slot. ing.

Next, the slot interrupt device according to this embodiment has a structure as shown in FIG. The transmission / reception timing circuit 1 outputs a transmission slot interruption signal and a reception slot interruption signal, and further a slot identification signal in correspondence with the transmission / reception timing of the transmission slot and the reception slot.
As shown in FIG. 2, the transmission slot interrupt signal has a transmission clock (384 Kbit / s or 192 Kbit / s) after the error checking bit portion (CRC) of the slot tail portion is transmitted when the transmission slot is transmitted from the base station. It is output as a pulse for a predetermined time (X time) in synchronism with s). In addition, as shown in FIG. 3, the reception slot interrupt signal includes a reception clock (384) after the error checking bit portion (CRC) of the slot tail portion is received when the reception slot is received from the mobile device.
It is output as a pulse for a predetermined time (X time) in synchronization with Kbit / s). The slot identification signal is a 3-bit signal so that each of the eight slots can be uniquely identified, and the signal of the corresponding bit configuration is output during the transmission or reception processing of the corresponding slot.

That is, as shown in FIG. 4, the transmission slot interrupt signal is output at each transmission slot (transmission 1 to 4) division, and the reception slot interruption signal is divided at each reception slot (reception 1 to 4) division. Is output with. Also, the slot identification signal is a combination of bits (000 that uniquely identifies each slot during processing of each slot (transmission 1 to 4, reception 1 to 4).
~ 111) is output. Here, in the present embodiment, as described above, the transmission / reception timing circuit 1 detects the division of each transmission slot and outputs the transmission slot interrupt signal, and the transmission timing means detects the division of each reception slot to receive. It comprises reception timing means for outputting a slot interruption signal and slot identification means for outputting a slot identification signal for uniquely identifying each slot.

The transmission slot interrupt signal and the reception slot interrupt signal are input to the interrupt control circuit 4 via the signal lines 2 and 3 and to the interrupt terminal of the processor (CPU) 5 for system control. 5 is interrupted by the input of this interrupt signal and performs necessary system control. That is, the processor 5 is interrupted at intervals of transmission slots or reception slots and executes system control in units of slots. On the other hand, the slot identification signal is input to the output port circuit 9 via the signal line 6 and to the processor 5 via the signal line 10 and the data bus 11, and the processor 5 identifies each slot to perform the system control. It can be carried out.

Corresponding to the reception of the reception slot, control signals are output from the transmission / reception timing circuit 1 through the signal lines 12 and 13, and these control signals are transmitted to the unique word detection circuit 14 and the CRC error detection circuit 15, respectively. Entered in. The unique word detection circuit 14 detects a unique word (UW) from the reception slot and outputs a unique word detection signal to the D-type latch 17 via the signal line 16 at the time of detection. The unique word detection signal is, as shown in FIG. 3, the unique word part (UW) of the receiving slot.
Is output from the end of reception of the signal to the time when it overlaps with the reception slot interrupt signal, but due to the difference in slot configuration, the signal in the control slot (UW = 32) and the signal in the communication slot (UW = 16 ) And the output time is different. On the other hand, the CRC error detection circuit 15 detects the presence or absence of a transmission error from the error check bit portion (CRC) of the reception slot, and outputs an error detection signal to the D-type latch 19 via the signal line 18 when the error is detected. To do.
As shown in FIG. 3, this error detection signal is output from the time when the reception of the error check bit portion (CRC) of the reception slot ends to the time when it overlaps with the reception slot interrupt signal.

The reception slot interrupt signal is input to the clock input terminals of the latch 17 and the latch 19 via the signal line 3, and the state of the unique word detection signal and the error detection signal at the time of input of the reception slot interrupt signal. And the state of 1 are held by the latch 17 and the latch 19. That is,
The states of the unique word detection signal and the error detection signal of the reception slot (for example, reception 1) are held in the latches 17 and 19 until the reception slot interrupt signal of the next reception slot (for example, reception 2) is input. It The signal states held in the latch 17 and the latch 19 are the signal lines 2 respectively.
It is input to the output port circuit 22 via 0 and 21, and further input to the processor 5 via the signal line 23 and the data bus 11. As a result, the processor 5 can perform system control in response to detection of a unique word in each reception slot or detection of a transmission error.

According to the slot interrupt device having the above-described structure, when the base station transmits and receives to and from the mobile unit, the transmission slot interrupt signal or the reception slot interrupt signal output from the transmission / reception timing circuit 1 at the time of dividing each slot. Is the processor 5
Is input to As a result, the processor 5 is interrupted at each slot delimiter. When performing this system control, the slot identification signal output from the transmission / reception timing circuit 1, the unique word detection signal output from the unique word detection circuit 14, and the error detection signal output from the CRC error detection circuit 15 Is input to the processor 5. As a result, the processor 5 can perform system control on a slot-by-slot basis corresponding to each slot and corresponding to the transmission state of each slot.

In the above embodiment, 4-channel TDMA is used.
An example in which the present invention is applied to the digital communication of the method has been shown.
The present invention can be widely applied to the TDMA system. In addition, in the above-described embodiment, the transmission / reception between the base station and the mobile device is 1
Although the example in which the present invention is applied to the system that uses the frequency is shown, the present invention can also be applied to the system that uses different frequencies for transmission and reception. Further, in the above embodiment, the processor 5
Although the control circuit 4 for generating an interrupt is provided separately from the processor 5, the function of the interrupt control circuit 4 may be included in the function of the processor 5. Further, in the above embodiment, one transmission / reception timing circuit 1 includes the transmission timing means for outputting the transmission slot interrupt signal, the reception timing means for outputting the reception slot interrupt signal, and the slot identification means for outputting the slot identification signal. However, these means may be configured as separate circuits.

[0017]

As described above, according to the slot interruption device of the present invention, the slot interruption signal is input to the processing means for system control for each slot delimiter by the transmission slot timing means or the reception slot timing means. Further, since the slot identification signal uniquely corresponding to each slot by the slot identification means, the unique word detection signal by the unique word detection means, and the error detection signal by the error detection means are input to the processing means, the processing means transmits and receives. The system control corresponding to each state and each mobile device can be performed on a slot-by-slot basis, and efficient system control as a whole can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a slot interrupt device according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram illustrating a configuration of a transmission slot and a timing of a slot interrupt signal.

FIG. 3 is a conceptual diagram illustrating a configuration of a reception slot and timings of a slot interrupt signal and a detection signal.

FIG. 4 is a conceptual diagram illustrating a TDMA frame structure and a slot identification signal.

[Explanation of symbols]

 1 Transmit / Receive Timing Circuit 4 Interrupt Control Circuit 5 Processor 7, 22 Output Port Circuit 14 Unique Word Detection Circuit 15 CRC Error Detection Circuit 17, 19 Latch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Kato 3-14-20 Higashi-Nakano, Nakano-ku, Tokyo Kokusai Electric Co., Ltd.

Claims (1)

[Claims] 1. A slot interrupt device, which is provided in a base station connected to a mobile device by TDMA wireless communication and detects each slot in a TDMA frame, detects a division of each transmission slot and transmits a transmission slot allocation. A transmission timing means for outputting an input signal, a reception timing means for detecting a division of each reception slot and outputting a reception slot interruption signal, and a slot identification means for outputting a slot identification signal for uniquely identifying each slot, The unique word detecting means for detecting the unique word of the receiving slot and outputting the unique word detecting signal, the error detecting means for detecting the transmission error of the receiving slot and outputting the error detecting signal, and the processing means for controlling the system are described above. Slot identification signal,
Input means for inputting the unique word detection signal and the error detection signal; and interrupt control means for inputting the transmission slot interrupt signal and the reception slot interrupt signal to the processing means to interrupt the processing means. A slot interrupt device, comprising: