JP2009141898A - Bidirectional radio system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bidirectional radio system with low electric-power consumption by varying a synchronous window, a receiving interval (receiving intermittent-width) and code length for synchronization, by adjusting a radio communication interval and access speed and by actualizing a flexible system. <P>SOLUTION: In the bidirectional radio system, a base counter 12 to count the receiving intermittent-width, the synchronous window, the code length for synchronization and time-out time of error detection, a waiting time counter 13, and as setting control means to set parameters for counting, a microcomputer 21, a parameter holding memory 22, a first parameter holding circuit 23, a parameter selecting circuit 24 and a second parameter holding circuit 25 adjust values of the parameters according to a situation of reception and transmittance of a radio signal and vary the receiving intermittent-width, a width of the synchronous window and the code length for synchronization. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bidirectional wireless system operating with weak radio waves, and more particularly to a bidirectional wireless system with low power consumption.

[Two-way radio system: Fig. 8]
A wireless device used in a conventional bidirectional wireless system is a wireless device that operates on a weak radio wave that employs a spread spectrum (SS) system.
A conventional bidirectional wireless system will be described with reference to FIG. FIG. 8 is a schematic diagram of a conventional two-way radio system.
The conventional two-way radio system includes a radio of the base unit 1 having a transmission unit 1a and a reception unit 1b, and a radio of the slave unit 2 having a transmission unit 2a and a reception unit 2b. (Switch or the like) is operated to transmit an operation command from the slave unit 2 to the master unit 1, and the master unit 1 operates according to the command.

Moreover, the main | base station 1 transmits the response of the transmission status of a command, and the status information of the main | base station 1 to the subunit | mobile_unit 2, and the subunit | mobile_unit 2 receives the said signal and displays it on a display apparatus (LED etc.). It is like that.
In other words, the conventional bidirectional wireless system is a weak wireless system capable of bidirectional communication (half duplex) employing SS.

  The bidirectional wireless system operates under the initiative of the slave unit 2. The master unit 1 receives a command from the slave unit 2 by intermittently receiving the transmission of the slave unit 2, and the slave unit 2 Since the operation state is set only when it is desired to operate, the power consumption can be reduced.

  The radio frame of the conventional two-way radio system consists of a synchronization unit and a data unit. The synchronization unit detects the presence of radio and detects the synchronization word (Sync) to establish synchronization between radios. When completed, the user data is transmitted in the data portion.

  The length of the synchronization code (Preamble) in the synchronization unit is determined by the intermittent period of the master unit. If the intermittent cycle of the master unit is shortened, access time (wireless communication time) can be saved, but power consumption of the master unit also increases. On the other hand, when the length is longer, the access time (wireless communication time) takes longer, but the power consumption of the parent device can be suppressed.

  As related prior art, there are JP-A-10-336760 (Patent Document 1) and JP-A-2005-076375 (Patent Document 2).

  In Patent Document 1, in the receiver, the standby time measurement timer measures the elapsed time from the final operation, and the intermittent cycle control unit controls the switching circuit according to the elapsed time to turn on / off the power of the reception circuit. It is shown that the intermittent period is gradually increased.

  In Patent Document 2, in the communication device, the power is intermittently turned on according to the intermittent period set during reception standby, and when a predetermined wake-up signal is detected, a subsequent signal is received and a response is returned. Further, it is shown that when a transmission request is received, a wake-up signal having a length corresponding to an intermittent period set in a signal generated in accordance with the transmission request is added and transmitted.

JP-A-10-336760 Japanese Patent Laying-Open No. 2005-076375

  However, in the conventional bidirectional wireless system shown in FIG. 8 above, since the intermittent period does not change, the length of the synchronization code (preamble code) is limited, and wasteful data for wireless communication is transmitted. In addition, there is a problem that access time (communication time) is lost.

  In addition, the intermittent period in the conventional bidirectional wireless system is a large condition for determining the power consumption and access time of the system, and the low power consumption and the access time are contradictory conditions. There was a problem that a flexible system configuration could not be expected.

  Further, the conventional bidirectional wireless system has a problem in that the reception sensitivity is limited by the intermittent period and the synchronization code length.

  In Patent Document 1, it is described that the intermittent cycle is lengthened. At that time, the power-on time Ton is kept constant and the power-off time Toff is extended (see [0027]). Also, Patent Document 2 discloses that the intermittent period is simply increased, the synchronization window is made variable, the reception intermittent width is made variable, and the synchronization code (preamble code) length is made variable. Absent.

  The present invention has been made in view of the above circumstances, and can adjust a wireless communication interval and an access speed by making a synchronization window, a reception interval (reception intermittent width), and a synchronization code length variable, and a flexible system. The purpose is to provide a two-way wireless system with low power consumption.

  The present invention for solving the problems of the above-described conventional example is a bidirectional wireless system that operates with weak radio waves, in which a radio start signal is input and the intermittent period of reception according to the value of the input set parameter A synchronization window width, a synchronization code length, a counter that counts a false detection timeout time, a wireless start signal is input, and a wireless state control unit that outputs a wireless state based on a count value from the counter; Setting control means for setting the parameter values relating to the intermittent period of reception, the width of the synchronization window, the synchronization code length, and the timeout time of false detection in the counter, the setting control means depending on the state of transmission and reception of radio signals The parameter value is adjusted and set in the counter.

  According to the present invention, in the above-described bidirectional wireless system, if the setting control unit on the transmission side cannot perform the first communication, the synchronization code length is sequentially increased until synchronization is obtained between the transmission side and the reception side. The parameter value is set.

  According to the present invention, in the above-described bidirectional wireless system, the setting control unit on the reception side sequentially shortens the intermittent period of reception until synchronization is obtained when there is a high possibility that wireless data exists from the state of the received signal. A parameter value is set in the counter.

  According to the present invention, in the above-described bidirectional wireless system, the setting control unit on the receiving side sequentially increases the width of the synchronization window until synchronization is obtained when there is a high possibility that wireless data exists from the state of the received signal. A parameter value is set in the counter.

  In the bidirectional wireless system, the transmission-side setting control means sets the parameter value in the transmission-side counter so that the synchronization code is lengthened, and the reception-side setting control means Set the parameter value in the counter on the receiving side to lengthen the cycle, and the setting control means on the transmitting side sets the parameter value in the counter on the transmitting side so that the synchronization code is shortened by transmitting the trigger information for starting communication. And the setting control means on the receiving side sets the parameter value in the counter on the receiving side so as to shorten the intermittent period of reception by receiving the trigger information for starting communication.

  In the bidirectional wireless system, the transmission side setting control means sets a parameter value in the transmission side counter so that the synchronization code is lengthened by transmission of the trigger information for communication termination, The setting control means is characterized in that the parameter value is set in the counter on the receiving side so as to lengthen the intermittent period of reception by receiving the trigger information of communication end.

  According to the present invention, a radio start signal is input, and according to the value of the input parameter, a counter that counts the intermittent period of reception, the width of the synchronization window, the synchronization code length, and the time-out time for erroneous detection; A wireless state control unit that outputs a wireless state based on a count value from a counter as well as a wireless start signal, and parameters related to intermittent reception period, synchronization window width, synchronization code length, and false detection timeout time And a setting control means for setting the value of the counter in the counter, and the setting control means adjusts the value of the parameter and sets the value in the counter according to the state of transmission / reception of the radio signal. Communication interval and access speed can be adjusted by making it possible to arbitrarily set the intermittent period, synchronization window width, and synchronization code length. There is an effect that can cost power.

  According to the present invention, when the first-side communication is impossible, the transmission-side setting control means sets the parameter value in the counter so that the synchronization code length is sequentially increased until synchronization is obtained between the transmission side and the reception side. Since the above-described two-way radio system is used, it is possible to improve the reception sensitivity.

  According to the present invention, when there is a high possibility that wireless data exists from the state of the received signal, the setting control means on the receiving side sets the parameter value in the counter so as to sequentially shorten the intermittent period of reception until synchronization is obtained. Since the above-described two-way wireless system is set, the probability of synchronization is increased, and the reception sensitivity can be improved.

  According to the present invention, when the setting control means on the receiving side has a high possibility of the presence of wireless data from the state of the received signal, the parameter value of the counter is set so that the width of the synchronization window is gradually increased until synchronization is obtained. Since the above-described two-way wireless system is set, the probability of synchronization is increased, and the reception sensitivity can be improved.

  According to the present invention, the setting control unit on the transmission side sets the parameter value in the counter on the transmission side so as to lengthen the synchronization code, and the setting control unit on the reception side increases the intermittent period of reception. The parameter value is set in the counter on the receiving side, and the setting control means on the transmitting side sets the parameter value in the counter on the transmitting side so that the synchronization code is shortened by transmitting the trigger information for communication start. The high-speed data communication is possible because the setting control means on the side uses the above-mentioned bidirectional wireless system that sets the parameter value in the reception-side counter so that the intermittent period of reception is shortened by receiving the trigger information for starting communication. There is an effect that a large amount of data can be transmitted and received.

  According to the present invention, the setting control unit on the transmission side sets the parameter value in the counter on the transmission side so that the synchronization code is lengthened by transmitting the trigger information for communication termination, and the setting control unit on the reception side includes: Since the above-described bidirectional wireless system sets the parameter value in the counter on the receiving side so as to lengthen the intermittent period of reception by receiving the trigger information at the end of communication, the effect of reducing power consumption after high-speed data communication There is.

Embodiments of the present invention will be described with reference to the drawings.
[Outline of the embodiment]
In the bidirectional wireless system according to the embodiment of the present invention, in the communication control circuits on the transmission side and the reception side, the reception intermittent width (intermittent period) is made variable, the synchronization window is made variable, the synchronization code length, If the transmission side cannot communicate for the first time, the synchronization code length is increased in stages until communication is possible, and the wireless state is monitored on the reception side. When there is a high possibility that wireless data exists, the intermittent period is shortened or the intermittent window is widened. Further, when communication is not performed for a long time on the transmitting side and the receiving side, the intermittent period and the synchronization code , Shorten the synchronization code by sending the trigger information for communication start, shorten the intermittent cycle by receiving the trigger information for communication start, and perform data communication by sending the trigger information for communication end. the code Comb, performs control to increase the intermittent period by receiving the trigger information of the communication termination, it is possible to improve the reception sensitivity, and low power consumption, in which build a flexible system.

[Principle of intermittent reception: Fig. 1]
The principle of intermittent reception according to the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a time chart of intermittent reception according to an embodiment of the present invention.
In order to realize bidirectional communication, by setting eight parameters, in the embodiment of the present invention, the synchronization window can be made variable, the reception intermittent width (intermittent period) can be made variable, and synchronization ( The preamble) code length can be made variable, and the false detection timeout time can be made variable.

  As shown in FIG. 1, the F0 synchronization width (F0_WID) of F0_SYEN (synchronization window 0) is set as the first parameter and the F1_SYEN (synchronization window 1) is set as the second parameter with respect to the ON / OFF timing of the radio signal. F1 synchronization width (F1_WID), third parameter as intermittent width (INT_STA), fourth parameter as guard time (GT_TIME), fifth parameter as instruction preamble length (PRE_INS_TIME), and sixth parameter as response preamble length ( PRE_RES_TIME), a command timeout time (TIME_INS_OUT) as a seventh parameter, and a response timeout time (TIME_RES_OUT) as an eighth parameter, thereby realizing intermittent reception.

The F0 synchronization width is the time for detecting the correlation with the frequency F0, and the F1 synchronization width is the time for detecting the correlation with the frequency F1.
The intermittent width determines the interval (intermittent cycle) of intermittent reception.
The guard time is a time required for turning on / off the radio signal.
The instruction preamble length is a time for specifying the length of the instruction preamble code, and the response preamble length is a time for specifying the length of the response preamble code.
The command timeout time is a time indicating the synchronization detection time-out for the command, and the response timeout time is a time indicating the synchronization detection time-out for the response.

  In FIG. 1, the correlation is detected with the F0 synchronization width or the F1 synchronization width, the instruction preamble is transmitted with the instruction preamble length from the slave unit within the instruction timeout time, and the master unit detects the instruction preamble, and the response preamble is detected. Bidirectional intermittent reception is realized by transmitting a long response preamble to the slave unit.

  1 is responsible for setting the radio signal ON / OFF, the synchronization window 0, the synchronization window 1, the intermittent width, the guard time, the response timeout time, and the command timeout time in the master unit. Length, response preamble length, and guard time are set by the slave unit.

[Key points of the embodiment]
[Point 1]
When the first communication cannot be performed on the transmission side (slave device side), the communication is performed with a longer preamble code, and the preamble code is changed to be longer until communication is possible to improve sensitivity. In this case, the instruction preamble length and the guard time are adjusted as parameters in FIG.

[Point 2]
The reception side (base unit side) monitors the wireless status and the like, and when wireless data is likely to exist, the reception sensitivity is improved by widening the intermittent window or shortening the intermittent period. In this case, the F0 synchronization width, F1 synchronization width, intermittent width, and guard time are adjusted as parameters in FIG.

[Point 3]
In a system that does not communicate for a long time on the transmission side (slave unit side) and reception side (base unit side), if you want to configure with low power consumption, increase the intermittent width and preamble length, and send and receive communication start triggers If so, the preamble length is shortened to shorten the intermittent time (intermittent width), and a large amount of data is transmitted / received by high-speed data communication.
Further, when a transmission end trigger is transmitted and received on the transmission side and the reception side, the intermittent width and the preamble length are lengthened. This makes it possible to construct a system that can reduce power consumption and perform high-speed transmission / reception.
In this case, the guard time, intermittent width, instruction preamble length, and instruction timeout length are adjusted as parameters in FIG.

[Communication control circuit: Fig. 2]
Next, a communication control circuit according to the embodiment of the present invention will be described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the communication control circuit according to the embodiment of the present invention.
As shown in FIG. 2, the communication control circuit (the present communication control circuit) according to the embodiment of the present invention includes a wireless state control unit 11, a base (BASE) counter 12, a waiting time counter 13, a microcomputer 21, The parameter holding memory 22, the first parameter holding circuit 23, the parameter selection circuit 24, and the second parameter holding circuit 25 are basically provided.

  The microcomputer 21, the parameter holding memory 22, the first parameter holding circuit 23, the parameter selection circuit 24, and the second parameter holding circuit 25 are connected via an external bus and input / output data and the like. . A set of these parts corresponds to setting control means in the claims.

Further, a first output terminal in which a fixed parameter for defining the length of each state for the base counter 12 is set, and a second parameter for setting a waiting time and an automatic return time for the waiting time counter 13 are set. Output terminals are provided.
In the claims, the base counter 12 and the waiting time counter 13 are collectively referred to as counters.

[Each part of the communication control circuit]
Each part of the communication control circuit will be specifically described.
The wireless state control unit 11 receives a wireless start signal (START_P), and also receives a count end signal (XXX_B_END) from the base counter 12 and a count end signal (XXX_W_END) from the waiting time counter 13, and a control signal for wireless operation ( Radio state signal) is generated and output to the external, base counter 12, and waiting time counter 13.

  As the wireless state signal, “IDLE” in the idle state, “G” of the guard that is the time to turn on / off the wireless signal, “P” of the preamble for synchronization, “S” of the sync for detecting the leading data (Sync) ”,“ INFO ”of system information,“ DATA ”of user data, and“ RX_INT ”waiting for reception for searching for a received signal.

  The base (BASE) counter 12 inputs a radio start signal (START_P) and a parameter for defining the length of each state, measures each state length based on the radio start signal, and outputs a count end signal (XXX_B_END). Output to the wireless state control unit 11.

  In particular, the base counter 12 has a first parameter “F0 synchronization width” (first half of the reception wait state length), a second parameter “F1 synchronization width” (second half of the reception wait state length), The time according to the fifth parameter “instruction preamble length” and the sixth parameter “response preamble length” is measured.

  The waiting time counter 13 inputs a wireless start signal (START_P) and also inputs parameters that define the waiting time and automatic return time. The wireless automatic return time (timeout), wait time, and intermittent time are based on the wireless start signal. And the count end signal (XXX_W_END) is output to the wireless state control unit 11.

  In particular, the waiting time counter 13 measures the time according to the third parameter “intermittent width” (intermittent time), the seventh parameter “command timeout time”, and the eighth parameter “response timeout time”.

  The microcomputer 21 controls the parameter holding memory 22, the first parameter holding circuit 23, the parameter selection circuit 24, and the second parameter holding circuit 25. A fixed parameter (XXX_B_PAR) for defining the length of each state is set. In addition to setting the first output terminal, a fixed parameter (XXX_W_PAR) that defines waiting time, intermittent time, and automatic recovery time is set to the second output terminal.

  Further, the microcomputer 21 outputs an arbitrary parameter that defines the length of each state according to the communication status to the first parameter holding circuit 23, and also an arbitrary parameter that defines the waiting time, intermittent time, and automatic recovery time. Is output to the second parameter holding circuit 25. The process of specifying the value of this arbitrary parameter and the process of outputting to the first and second parameter holding circuits 23 and 25 are realized by program control of the microcomputer 21.

  Further, the microcomputer 21 instructs the parameter selection circuit 24 to select either an arbitrary parameter held in the first parameter holding circuit 23 or a fixed parameter set in the first output terminal. And an instruction signal for selecting either an arbitrary parameter held in the second parameter holding circuit 25 or a fixed parameter set in the second output terminal to the parameter selection circuit 24 Is output. The output process of the instruction signal is also realized by program control of the microcomputer 21.

The parameter holding memory 22 stores parameters as initial values for defining the length of each state in the first parameter holding circuit 23, and wait time, intermittent time, and automatic recovery for the second parameter holding circuit 25. A parameter as an initial value defining the time is stored.
The initial parameter of the parameter holding memory 22 is automatically loaded into the first parameter holding circuit 23 and the second parameter holding circuit 25 when the power is turned on.

  When the power is turned on, the first parameter holding circuit 23 loads and holds an initial value parameter that defines the length of each state stored in the parameter holding memory 22, and thereafter, each parameter set by the microcomputer 21 is loaded. Update and hold with any parameter that defines the length of the state.

  The parameter selection circuit 24 is either an arbitrary parameter (including an initial value) held in the first parameter holding circuit 23 or a fixed parameter set in the first output terminal according to an instruction signal from the microcomputer 21. And any one of the arbitrary parameters (including the initial value) held in the second parameter holding circuit 25 or the fixed parameter set in the second output terminal is selectively outputted.

  The second parameter holding circuit 25 loads and holds the initial value parameters that define the waiting time, intermittent time, and automatic recovery time stored in the parameter holding memory 22 when the power is turned on. Is updated with arbitrary parameters that define the waiting time, intermittent time, and automatic recovery time set from the above.

The communication control circuit can change various parameters with the above-described configuration, and the parameters can be freely changed by the parameter holding memory 22 or the microcomputer 21.
Further, since the parameter can be changed from the microcomputer 21, it can be changed in real time.
Furthermore, since the parameters can be automatically loaded from the parameter holding memory 22 to the first and second parameter holding circuits 23 and 25, the parameters can be changed without a control circuit such as the microcomputer 21.

[Processing of communication control circuit of slave unit: Fig. 3]
Processing in the communication control circuit on the transmission side (child device side) will be described with reference to FIGS. FIG. 3 is a flowchart showing processing in the communication control circuit of the slave unit, and FIG. 4 is a schematic diagram showing a radio frame of the slave unit.
In this process, when the first communication is impossible, the communication is performed with a longer preamble code, and the preamble length is changed until communication is possible, thereby improving sensitivity.

In the communication control circuit of the slave unit, as shown in FIG. 3, when processing is started, the preamble length of the preamble code measured by the base counter 12 is a fixed parameter set at the first output terminal, or One of the parameters of the initial value set in the parameter holding memory 22 and held in the first parameter holding circuit 23 is set (S11).
Whether one of the above is selected is selected by the parameter selection circuit 24 according to an instruction signal from the microcomputer 21. Note that the instruction signal for selecting which one in the microcomputer 21 is based on a user setting.

  The preamble length measured by the base counter 12 is an instruction preamble length and a response preamble length, and an instruction timeout time and a response timeout time corresponding to the preamble length are set in the waiting time counter 13.

Next, the base counter 12 measures the preamble length according to the set parameters, and the waiting time counter 13 also performs necessary measurements, and transmits a radio frame (S12).
And it is determined whether it was able to synchronize by receiving the response signal (ACK) from a main | base station (S13).

  If synchronization is successful (in the case of Yes), the process is terminated. If synchronization is not possible (in the case of No), the parameter obtained by setting the preamble length to n times as set by the microcomputer 21 is retained as the first parameter. Further, the parameter selection circuit 24 causes the parameter selection circuit 24 to select the parameter (n times the preamble length) held in the first parameter holding circuit 23, and sets it in the base counter 12 (S14).

In step S14, specifically, an n-times instruction preamble length is set in the base counter 12, and an instruction timeout time corresponding to the length is set in the waiting time counter 13.
Accordingly, the microcomputer 21 causes the second parameter holding circuit 25 to hold the parameter of the instruction timeout time corresponding to the instruction preamble length of n times, and further holds the parameter selection circuit 24 in the second parameter holding circuit 25. The selected parameter (instruction timeout time corresponding to the instruction preamble length of n times) is selected and set in the waiting time counter 13.

  A radio frame is transmitted according to the newly set n-times preamble parameter or the like (S12), and the process proceeds to determination process S13, and the process of increasing the preamble length by n is repeated until synchronization is performed.

[Radio frame of handset: Fig. 4]
As shown in FIG. 4, the radio frame transmitted by the slave unit becomes an upper frame according to a fixed parameter or an initial value parameter. When synchronization is not possible with this frame, a radio frame is transmitted with a preamble length of n times. Will be generated.
As a result, the probability that synchronization can be increased by n times, and the probability that reception can be improved, so that the sensitivity can be improved.

[Processing of communication control circuit of base unit: FIG. 5]
Processing in the communication control circuit on the reception side (base unit side) will be described with reference to FIGS. FIG. 5 is a flowchart showing processing in the communication control circuit of the parent device, and FIG. 6 is a schematic diagram showing a radio frame of the parent device.
In this process, the master unit checks the wireless status and the like, and when wireless data is likely to exist, the intermittent window is widened or the intermittent period is shortened to improve the reception sensitivity.
Whether or not wireless data is likely to exist is monitored by, for example, the received signal strength indicator (RSSI) of the wireless signal, and it is determined that the wireless data is present if it is a specific value or more.

  In the communication control circuit of the master unit, as shown in FIG. 5, when processing is started, the F0 synchronization width, F1 synchronization width (intermittent window), etc. measured by the base counter 12 are set to the first output terminal. Is set in the fixed parameter or the parameter holding memory 22 and the initial value parameter held in the first parameter holding circuit 23 is set, and the intermittent time (intermittent width) measured by the waiting time counter 13 is set. ) Or the like is set to either a fixed parameter set in the second output terminal or a parameter of an initial value set in the parameter holding memory 22 and held in the second parameter holding circuit 25 (S21). ).

  Whether one of the above is selected is selected by the parameter selection circuit 24 according to an instruction signal from the microcomputer 21. Note that the instruction signal for selecting which one in the microcomputer 21 is based on a user setting.

Next, according to the set parameters, the base counter 12 measures the F0 synchronization width, the F1 synchronization width, and other parameters, and the waiting time counter 13 also measures the intermittent time and other parameters to perform intermittent reception. (S22).
And it is determined whether it was able to synchronize by transmitting a response signal (ACK) from a main | base station (S23).

  When synchronization is possible (in the case of Yes), a reception operation is performed (S24), and the process ends. When the synchronization cannot be performed (in the case of No), the second parameter holding circuit 25 holds a parameter or the like obtained by setting the intermittent width (intermittent time) to 1 / n times by the setting from the microcomputer 21 or the microcomputer 21. Causes the first parameter holding circuit 23 to hold a parameter obtained by multiplying the intermittent window (F0 synchronization width, F1 synchronization width) by n times.

  Further, the microcomputer 21 causes the parameter selection circuit 24 to select a parameter (n times F0 synchronization width, F1 synchronization width, etc.) held in the first parameter holding circuit 23, and sets the parameter in the base counter 12. 21 causes the parameter selection circuit 24 to select a parameter (such as 1 / n intermittent width) held in the second parameter holding circuit 25 and sets it in the waiting time counter 13 (S25).

  Transmit intermittent reception according to the newly set n-fold intermittent window parameter, 1 / n intermittent-width parameter, etc. (S22), and shift to determination processing S23, and the intermittent window is multiplied by n until synchronization. The process of setting the intermittent width to 1 / n is repeated.

[Intermittent cycle of master unit: Fig. 6]
As shown in FIG. 6 (1), the intermittent period in the master unit is one in which the intermittent width (intermittent period) is 1 / n, and the intermittent window is n times as shown in FIG. 6 (2). There is.
In FIG. 6 (1), the intermittent width is reduced to 1 / n, and in FIG. 6 (2), the intermittent window is increased n times, thereby increasing the probability of synchronization and improving the probability of reception. Therefore, the sensitivity can be improved.

Although FIG. 6 (1) and FIG. 6 (2) have been described as separate processes, they may be combined and controlled simultaneously.
In other words, the process of setting the intermittent width to 1 / n and the intermittent window to n times may be performed alternately, or the process of increasing the intermittent window to n times based on the process of setting the intermittent width to 1 / n is inserted. Alternatively, conversely, a process of setting the intermittent width to 1 / n may be inserted based on the process of multiplying the intermittent window by n times.

[Processing of communication control circuit of slave unit / master unit: FIG. 7]
Processing in the communication control circuit on both the transmission side (slave unit) and the reception side (base unit side) will be described with reference to FIG. FIG. 7 is a schematic diagram showing another process in the communication control circuit of the child device / parent device.
In this process, in the case of low power consumption in a system that does not communicate for a long time, the transmitting side increases the preamble length by n times to increase the trigger information for starting high-speed data communication within the radio frame. Incorporate. For example, trigger information for starting high-speed data communication and data size information are incorporated into “INFO” and “DATA” of the radio frame.
Further, after transmitting the trigger information for starting high-speed data communication, the transmission side returns the preamble length to the normal length and transmits continuous data.

  The receiving side sets the intermittent period to a longer time than usual to suppress power consumption. On the receiving side, when trigger information for starting high-speed data communication is received, the intermittent cycle is shortened, for example, set to the minimum, operates with the minimum intermittent cycle until synchronization, and when synchronized, continuous data is received.

In addition, the transmission side incorporates trigger information for ending high-speed data communication in a wireless frame of continuous data. For example, trigger information for ending high-speed data communication is incorporated into “INFO” and “DATA” of the radio frame.
Further, after transmitting the trigger information for ending high-speed data communication, the transmitting side performs intermittent transmission by increasing the preamble length by n times.

  On the other hand, on the receiving side, when receiving trigger information for the end of high-speed data communication, the intermittent cycle is set to the state before high-speed data communication, that is, the intermittent cycle is set to a longer time than usual, and intermittent reception is performed. Suppress.

  In the processing of FIG. 7, as a parameter, the preamble length is variable in the slave unit, and the intermittent period and the timeout length are variable in the master unit. These processes are controlled by parameter settings of the microcomputer 21 for the base counter 12 and the waiting time counter 13 in FIG.

  Specifically, in the communication control circuit of the slave unit, the instruction preamble length parameter set by the microcomputer 21 in the base counter 12 is output to the first parameter holding circuit 23 and held therein, and the parameter selection circuit 24 stores the parameter. By making the selection, the instruction preamble length is made variable.

  In the communication control circuit of the master unit, the intermittent period and instruction timeout time parameters set in the waiting time counter 13 are output to the second parameter holding circuit 25 and held, and the parameter selection circuit 24 selects the parameter. Thus, the intermittent period and the instruction timeout time are made variable.

[Application example]
Although the points 1 to 3 of the embodiment have been specifically described using this communication control circuit, these techniques can be combined.
[Point 1 + 2]
For example, if the first communication is not possible on the transmission side (slave side), the communication is performed with a longer preamble code, and the preamble code is changed to be longer until communication is possible. When it is determined that there is wireless data from the wireless state, the intermittent window may be widened or the intermittent period may be shortened.

[Point 1 + 3]
For example, if the first communication is not possible on the transmission side (slave side), the communication is performed with a longer preamble code, and the preamble code is changed to be longer until communication is possible. When a communication start trigger is sent / received by receiving a response signal (ACK) from the receiver, the preamble length is shortened to shorten the intermittent time (intermittent width), a large amount of data is transmitted / received by high-speed data communication, and a communication end trigger is sent. In the transmission / reception, the preamble length may be increased to increase the intermittent time.

[Point 2 + 3]
For example, if the receiving side (base unit) determines that there is wireless data from the wireless state, the preamble length is shortened if the intermittent window is widened or the intermittent period is shortened and the communication start trigger is transmitted / received. Then, the intermittent time (intermittent width) may be shortened, a large amount of data may be transmitted / received by high-speed data communication, and the preamble length may be increased by transmitting / receiving a communication end trigger to increase the intermittent time.

[Point 1 + 2 + 3]
For example, if the first communication is not possible on the transmission side (slave side), the communication is performed with a longer preamble code, and the preamble code is changed to be longer until communication is possible. When it is determined that there is wireless data from the wireless state, the intermittent window is widened or the intermittent cycle is shortened, and when a communication start trigger is transmitted / received, the preamble length is shortened and the intermittent time (intermittent width) May be shortened, a large amount of data may be transmitted / received by high-speed data communication, and the preamble length may be increased by transmitting / receiving a communication end trigger to increase the intermittent time.

[Effect of the embodiment]
According to this bidirectional wireless system, when the first communication cannot be performed on the transmission side (slave unit side), the communication is performed with a longer preamble code, and the preamble code is made longer until communication becomes possible. Thus, the reception sensitivity can be improved.

  According to this two-way radio system, the reception side (base unit side) monitors the wireless status, etc., and when wireless data is likely to exist, the reception is performed by widening the intermittent window or shortening the intermittent period. There is an effect that the sensitivity can be improved.

  According to this bidirectional wireless system, when communication is not performed for a long time on the transmission side (slave unit side) and the reception side (base unit side), the intermittent width and the preamble length are increased, and transmission / reception trigger is transmitted / received. When the preamble length is shortened and the intermittent time (intermittent width) is shortened, a large amount of data is transmitted / received by high-speed data communication, and transmission / reception trigger transmission / reception is performed on the transmitting side and the receiving side, Since the preamble length is increased, it is possible to construct a system capable of reducing power consumption and transmitting / receiving at high speed.

  The present invention enables the synchronization window, reception interval (intermittent reception width), and synchronization code length to be variable, adjusts the wireless communication interval and access speed, and realizes a flexible system to achieve bidirectional low power consumption. Suitable for wireless systems.

It is a time chart of the intermittent reception which concerns on embodiment of this invention. It is a block diagram of the configuration of a communication control circuit according to an embodiment of the present invention. It is a flowchart which shows the process in the communication control circuit of a subunit | mobile_unit. It is the schematic which shows the radio | wireless frame of a subunit | mobile_unit. It is a flowchart which shows the process in the communication control circuit of a main | base station. It is the schematic which shows the radio | wireless frame of a main | base station. It is the schematic which shows another process in the communication control circuit of a subunit | mobile_unit and a main | base station. It is the schematic of the conventional two-way radio system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Main | base station, 1a ... Transmission part, 1b ... Reception part, 2 ... Slave unit, 2a ... Transmission part, 2b ... Reception part, 11 ... Radio | wireless state control part, 12 ... Base (BASE) counter, 13 ... Latency counter 21 ... Microcomputer, 22 ... Parameter holding memory, 23 ... First parameter holding circuit, 24 ... Parameter selection circuit, 25 ... Second parameter holding circuit

Claims (6)

A two-way radio system operating with weak radio waves,
A counter that counts the intermittent period of reception, the width of the synchronization window, the length of the synchronization code, and the time-out time of false detection according to the value of the input set parameter when the radio start signal is input,
A wireless state control unit that receives a wireless start signal and outputs a wireless state based on a count value from the counter;
A setting control means for setting a value of a parameter relating to an intermittent period of reception, a synchronization window width, a synchronization code length, and a timeout time of erroneous detection in the counter,
The bidirectional wireless system, wherein the setting control means adjusts the value of the parameter and sets the value in the counter according to a wireless signal transmission / reception situation.   The transmission-side setting control means sets the parameter value in the counter so that the synchronization code length is sequentially increased until synchronization is obtained between the transmission side and the reception side when the first communication is impossible. The two-way radio system according to claim 1.   The setting control means on the receiving side sets the parameter value in the counter so that the intermittent period of reception is sequentially shortened until synchronization is obtained when there is a high possibility that wireless data exists from the state of the received signal. The bidirectional wireless system according to claim 1 or 2.   The setting control means on the receiving side sets the parameter value in the counter so that the width of the synchronization window is gradually increased until synchronization is obtained when there is a high possibility that wireless data exists from the state of the received signal. The bidirectional wireless system according to any one of claims 1 to 3. The transmission-side setting control means sets the parameter value in the transmission-side counter so as to lengthen the synchronization code, and the reception-side setting control means sets the reception-side counter so as to lengthen the intermittent reception period. Set the parameter value,
The transmission-side setting control means sets a parameter value in the transmission-side counter so as to shorten the synchronization code by transmitting communication start trigger information, and the reception-side setting control means The bidirectional wireless system according to any one of claims 1 to 4, wherein a parameter value is set in the reception-side counter so as to shorten a reception intermittent period by receiving trigger information.   The transmission-side setting control means sets the parameter value in the transmission-side counter so that the synchronization code is lengthened by transmission of the communication end trigger information, and the reception-side setting control means sets the communication end trigger information. 6. The two-way radio system according to claim 5, wherein a parameter value is set in a counter on the receiving side so that the intermittent period of reception is increased by reception of.

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