JP2000134215A - Link control method for multi-channel access transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the link control system at a low cost for one-way radio communication by adopting the configuration for a multi-channel access only with a transmission function for a caller and only with a reception function for a called party. SOLUTION: A caller side uses only a transmission function and a called party uses only a reception function to attain multi-channel access. In this method, the system is configured to identify and discriminate an ID code or the like so that an identification code is set to single direction data from the transmitter side to the receiver side, and a transmission channel of a transmission unit 1 to which an input device connects is optionally set. Then a receiver side receiver unit 9 sequentially scans a plurality of channels and when the unit 9 recognizes an identification code over a plurality of number of times, a reception channel of multi-channel access reception is locked. In the case that the unit 9 cannot recognize the identification code over a plurality of number of times in the channel lock state, the reception channel confirmed at present is released and channel scanning is automatically restored.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system configuration of a pair of a transmitting unit and a receiving unit for performing unidirectional data communication, and a multi-channel access in unidirectional wireless communication for automatically locking / releasing a plurality of channels. The present invention relates to a link control method for a transmission device.

[0002]

2. Description of the Related Art Conventionally, when a wireless communication link is established, a system has a plurality of communication channels, and circulates each channel and establishes a communication link with an unused channel in order to avoid interference and interference with other devices. is there. This system is called multi-channel access (MCA).

In the wireless data communication in the multi-channel access system, first, a pass channel is determined in a certain frequency band in order to secure a path for transmitting and receiving data. This is referred to as establishing a wireless link and locking the channel. Usually, the protocol procedure for channel lock / release requires that two devices exchanging data have a transmission function and a reception function in each device.

In the link protocol procedure, a channel lock request is transmitted from one device (calling side), and an ACK signal indicating that the channel lock request is accepted is returned from the other device (called side) to the calling side. To complete the channel lock.

[0005] Similarly, for the channel release, the person who wants to end the communication sends a channel release request, the called party returns an acceptance signal corresponding to the channel release to the called party, and the two communication devices complete the channel release. However, the receiving side enters multi-channel access in a standby state.

[0006]

However, in the above-mentioned conventional system, in wireless data communication, first,
In order to secure a path for transmitting and receiving data and to determine a path channel in a certain frequency band, the transmitting side also needs to send an ACK.
A receiving unit for receiving the signal is required, and a transmitting unit for transmitting the ACK signal is also required on the receiving side.

As described above, in both the full-duplex / half-duplex wireless communication, in order to construct a multi-channel access system (MCA) that locks to one available channel among a plurality of communication channels, The calling side must have a transmitting function and a receiving function, and the called side also needs a transmitting / receiving function.

On the other hand, in bidirectional data communication, it is not wasteful to have a transmission / reception unit of a unit, but in a system for transferring data in a single direction, only the transmission function is required on the calling side to perform the original data transmission function. Thus, only the receiving function is sufficient for the called party. However, the calling side must have a receiving function and the called side needs a transmitting function as extra functions for performing multi-channel access.

The present invention takes the above conventional problems into consideration and omits the extra hardware and software of the receiving function on the calling side and the transmitting function on the called side in one-way wireless data communication, An object of the present invention is to provide a link control method for a multi-channel access transmission device in low-cost one-way wireless communication by realizing multi-channel access with only a transmission function and a called side only with a reception function.

[0010]

According to the present invention, there is provided a link control system for a multi-channel access transmission apparatus for unidirectional wireless communication, wherein a calling side uses a unique word (identification data or authentication data). And continuously transmit data packets containing
The called side circulates through a plurality of receiving channels and constructs a system for monitoring the unique word sent from the calling side.

According to the above system, by receiving the unique word more than once on a certain channel intermittently, it is possible to recognize that the received channel can be used as a pass channel with which communication can be performed. Will be able to perform channel lock. In addition, if the calling side changes the transmission channel by radio interference or the calling side, the called side cannot detect the unique word transmitted intermittently.

On the other hand, if the non-detection time is longer than a predetermined time, the called side determines that data cannot be received from the channel on which communication is currently being performed, releases the channel lock, and waits for reception. Then, a channel scan is performed to search for a channel in which a unique word can be newly detected. Multichannel access is realized on the receiving side by the unique word detection and non-detection methods.

Therefore, in the unidirectional wireless data communication system, a low cost system can be created in which the calling side does not have the receiving function and the called side does not have the transmitting function. Therefore, it is possible to realize a multi-channel access using only a unidirectional communication unit including only a transmission unit on a transmission side and only a reception unit on a reception side without mounting an extra transmission unit.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention relates to a transceiver to which input devices such as a mouse, a keyboard, and a joystick and an external device control input device are connected, and control information is transmitted using these input devices. In a unidirectional data communication remote control system capable of remotely operating a personal computer or an external device connected to a receiving receiver unit by transmitting to a unit, an identification code in a pair of transmitting and receiving units is converted into unidirectional data from transmission to reception. ID for which is set
When the system configuration is such that the code and the unique word packet can be identified and determined, the transmission channel of the transmission unit to which the input device is connected is arbitrarily set, and the reception side receiver unit sequentially scans a plurality of channels, If the identification code is recognized more than once, the receiving channel of multi-channel access reception is locked.If the identification code cannot be recognized more than once in the channel locked state, the currently determined receiving channel is released. Then, a link control method of the multi-channel access transmission device in the unidirectional wireless communication which automatically returns to the channel scan is adopted.

According to the invention, the calling side periodically and intermittently transmits the identification code from the transmission channel determined by the calling side, and the receiving unit on the called side intermittently transmits the identification code while cycling through the receiving channel. The channel is determined based on whether or not the identification code packet can be continuously received a plurality of times, and the release function is adopted, so that the calling side (transmitting side) has a receiving function and the called side (receiving side) has a transmitting function. This has the effect of making it possible to create a multi-channel access system omitting the above.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a block diagram of a transmission transceiver unit and a schematic connection diagram of an input device in the present invention, and FIG. 2 is a block diagram of a reception receiver unit and a schematic connection diagram of an output device in the same invention. 3 is a schematic diagram of a multi-channel access of the transmission / reception unit according to the present invention, and FIG. 4 is a schematic diagram of a channel lock / release protocol based on periodic identification code transmission according to the present invention.

Each function will be described in order from FIG. 1 is a transmitting transceiver unit, 2 is a transmitting antenna for transmitting data to the transceiver unit, and 3 is a transmitting R.
An F module, 4 is a CPU, and 5 is an external input device having a key and a button module for controlling an external device connected to the receiving side. A mouse 6, a keyboard 7, and a joystick 8 are connected to the transmission transceiver unit 1. The CPU 4 packetizes the data of the external input device 5, the mouse 6, the keyboard 7, and the joystick 8 into transmission data and transmits the transmission RF module 3.
Set the transmission channel for.

In FIG. 2, reference numeral 9 denotes a receiving receiver unit.
0 is a receiving antenna for receiving data from the transmitting transceiver unit, 11 is the receiving RF module, 12 is a receiving CPU, and a personal computer 13, an external device 14 and the like are connected to the receiving receiver unit 9.

FIG. 3 (a) shows a channel locked state in a continuous reception OK state of the periodic identification code of the multi-channel access of the transmitting / receiving unit, and FIG. 3 (b) shows a channel release in a continuous reception NG state of the periodic identification code. The state is shown.

In FIG. 4, reference numeral 15 denotes the transmitting transceiver unit 1.
Is a periodic identification code transmitted every t hours from
The receiving receiver unit 9 on the receiving side is the CPU 12
A receiving channel is set for the receiving RF module 11 and a plurality of channels are sequentially circulated.
It is determined whether the periodic identification code 15 can be continuously received a plurality of times while staying on one channel. If the identification code can be received a plurality of times, the reception receiver unit 9 determines that the data from the paired transmission transceiver unit 1 has been received due to the matching of the identification code, stops the channel scan, locks the current channel, and periodically It starts receiving unidirectional data from the transmitting transceiver sent after the identification code packet.

The unidirectional data is key and button data for controlling the mouse 6, keyboard 7, joystick 8, and external devices connected to the transmitting transceiver unit 1 shown in FIG. 1, and the receiving receiver receiving this data. The unit 9 decodes a single data packet and transfers the data to an output device, a personal computer 13 and an external device 14 connected to the receiving receiver unit 9.

In this way, the multi-channel access is realized only by the pair of the transmitting transceiver unit 1 and the receiving receiver unit 9 to perform unidirectional data communication to create a link control system.

Further, in order to automatically release the locked channel, the reception of the periodic identification code is continuously monitored even after the channel is locked by continuous reception of the periodic identification code 15. When an external disturbance or intentional change of the transmission channel of the transmission transceiver unit 1 is performed, the periodic identification code is not received by the receiving receiver unit 9, and the periodic identification code is not received a plurality of times. When the non-reception is confirmed a plurality of times, the reception receiver unit 9 abandons the currently locked channel, releases the channel, returns to the reception channel scan, and enters the multi-channel state.

FIG. 5 is a flowchart of the multi-channel access receiving unit for unidirectional communication. The contents of the control described in FIG. 4 which are realized in a logical manner will be sequentially described for each processing step.

Step 1 is an initialization start process of the flowchart of the multi-channel access receiving section, and step 2 is
Is a channel determination counter initialization-processing block, step 3 is a soft periodic task activation timer setting-processing block, step 4 is a periodic activation task registration (identification reception processing) -processing block, and step 5 is an initial flowchart of the multi-channel access receiving unit. This is the conversion end processing.
In these steps 1, 2, 3, 4, and 5, initialization for identification code recognition of the receiver unit 9 is performed.

In step 2, the identification code reception number counter Ch_Count is initialized a plurality of times, and in steps 3 and 4, the periodic task timer is set every t time so that the identification reception processing task can be activated at regular time intervals. Is performed.

Step 6 is a periodic task: identification reception start process.
The identification reception start process is always started periodically every time.

Step 7 is an identification code reception & judgment-processing block. Step 8 is a channel determination counter addition.
Processing block, step 9 is channel determination counter N
Step 10 is an N-time addition limiter-processing block for the channel determination counter N times, and Step 11 is a channel lock-determination-processing block for the channel lock. N periodic identification codes 1
It is determined whether or not No. 5 has been received. If N or more times have been received, channel lock is performed in step 11.

Step 12 is a channel determination counter subtraction-processing block. Step 13 is a channel determination counter-N consecutive non-reception determination-processing block. Step 1
4 is a channel determination counter 0 (channel holding time set) -processing block, and step 15 is a channel release (set the next channel to the receiving channel) -processing block. Steps 12 to 15 are channel release processing and multi-channel cyclic processing. I do.

In step 12, the channel determination counter C
While subtracting h_Count, a plurality of N consecutive non-receptions of the periodic identification code 15 are determined in step 13, and finally the current channel lock is released in step 15,
The process of switching the channel to the next channel is performed.

In step 13, the channel determination counter C
Ch_Cou when h_Count becomes −N times or less
The reason for setting nt = 0 is that if the channel is locked once, the continuous non-reception of the periodic identification code 15 must be determined 2 × N times in a row. The standby period is N times, and is periodically activated every t time. Therefore, once the lock is performed, the lock release wait time of tx2 × N time is obtained. The channel switching wait time from the lock detection-free channel to the next channel is txN.
The system is configured so that once it locks, it confirms that the periodic identification data has not been received for twice the normal time.

As described above, depending on the system which is difficult to release once the channel is locked as in the example shown in FIG. 5, or the setting of the channel determination counter and the setting of the judgment condition, the lock determination and the lock release time are set to the same time. Is easy to set.

Step 16 is a periodic task: identification reception end processing. As described above, lock and release of multi-channel reception are realized by only a pair of transmission / reception units of a single communication unit. Therefore, the transmitting-side receiving unit and the receiving-side transmitting unit only for the multi-channel access can be omitted.

[0034]

As is apparent from the above description, according to the present invention, in one-way wireless data communication, the calling side has a receiving function and a called function as extra hardware and software functions for performing multi-channel access. The calling side does not need a transmission function, the calling side realizes multi-channel access only by the transmission function, and the called side only realizes the multi-channel access by only the reception function, thereby achieving an effect that a low-cost communication system can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram of a transmission transceiver unit and a schematic connection diagram of an input device according to the present invention.

FIG. 2 is a block diagram of a reception receiver unit and a schematic connection diagram of output devices according to the present invention.

3A is a schematic diagram of a channel lock state of the multi-channel access transmission device according to the present invention; FIG. 3B is a schematic diagram of a channel release state of the multi-channel access transmission device according to the present invention;

FIG. 4 is a schematic diagram of a channel lock / release protocol by transmitting a periodic identification code in the present invention.

FIG. 5 is a flowchart of a multi-channel access receiving unit using unidirectional communication according to the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission transceiver unit 2 Transmission antenna 3 Transmission RF module 4 CPU 5 External input device 6 Mouse 7 Keyboard 8 Joystick 9 Reception receiver unit 10 Reception antenna 11 Reception RF module 12 CPU 13 Personal computer (external connection) 14 External device 15 Periodic identification code Submit

Claims (1)

[Claims] An input device such as a mouse, a keyboard, and a joystick and an external device control input device are connected, and control information is transmitted to the transmission transceiver unit using the input devices, thereby being connected to the reception receiver unit. In a unidirectional data communication remote control system capable of remotely operating a personal computer or an external device, an ID code or a unique word packet in which an identification code in a pair of transmission / reception units is set in unidirectional data from transmission to reception. When the system configuration is such that it can be determined, the transmission channel of the transmission unit to which the input device is connected is arbitrarily set, and the receiver unit on the receiving side scans a plurality of channels sequentially, and identifies the identification code more than once. If recognized, multi Performs channel lock receiving channel of catcher down channel access reception, also when it is not possible to recognize a plurality of times or more identification codes in channel lock state,
A link control method for a multi-channel access transmission device, characterized in that a currently determined reception channel is released and the process automatically returns to channel scanning.