JP2000209193A - Communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect a synchronizing signal and an identification signal decided separately from standards and to quickly judge interruption in a reception state of a reception signal where the synchronizing signal is not in existence. SOLUTION: A communication control means 7 transmits first a 1st frame synchronizing signal in compliance with a standard and an N-bit call signal in the case of transmission and then transmits a 2nd frame synchronizing signal that is decided uniquely, an identification signal to identify a communication opposite party and a transmission data signal succeedingly. In the case of reception, a 1st frame synchronizing signal detection means 9 and a 2nd frame synchronizing signal detection means 10 retrieve the two frame synchronizing signals and when the 1st frame synchronizing signal is detected, the 2nd frame synchronizing signal after the N-bits is detected so as to receive the identification signal and the transmission data signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a first bit synchronization signal defined by a standard, a first frame synchronization signal which is a pseudo random code, And a communication method for transmitting a unique second bit synchronization signal, a second frame synchronization signal, an identification signal for identifying a communication partner, and a transmission data signal. . The present invention also relates to a communication method for transmitting a second bit synchronization signal, a second frame synchronization signal, and an identification signal first, and subsequently transmitting a transmission data signal.

[0002]

2. Description of the Related Art When communication is performed between a transmitting apparatus and a receiving apparatus, a first bit synchronizing signal, a first frame synchronizing signal which is a pseudo random code, and an N-bit calling signal are first specified. Japanese Patent Laid-Open No. Hei 10-1998 discloses a communication method of transmitting a transmission, and then transmitting a second bit synchronization signal, a second frame synchronization signal, an identification signal for identifying a communication partner, and a transmission data signal. 198881 will be described.

FIG. 13 shows a communication message format. The communication message is roughly divided into the following three.

[0004] The first is a signal defined by a standard for a specific low-power radio station. In FIG.
1, a first frame synchronization signal 52, a radio call name 53 which is a 63-bit call signal.

A second signal is a unique signal different from the standard. In FIG. 13, a second bit synchronization signal 55, a system identification signal 56 as a second frame synchronization signal, and a shortened / calling name as an identification signal are shown. 57. Hereinafter, the three of the second bit synchronization signal, the second frame synchronization signal, and the identification signal are collectively referred to as a connection signal. In this embodiment, the connection signal is repeatedly transmitted to perform the intermittent reception standby, and the repetitive transmission time is set longer than the intermittent reception standby period of the receiving device.

The third is a data signal which is transmission data.

Here, the receiving device receives the first bit synchronization signal or the second bit synchronization signal, synchronizes with the transmitting device, receives the second frame synchronization signal, and determines the head of the identification signal. Then, it receives the identification signal, confirms the communication partner, and receives the transmission data. As described above, the first frame signal and the call signal must be transmitted according to the standard, but are not necessarily required for reception.

[0008] Here, a signal defined by the standard for a specific low power radio station will be described.

The first bit synchronization signal is a 24-bit or more code alternately arranged with "1" and "0", and the first frame synchronization signal is a 31-bit pseudo-random code "00011".
011101000010001001011001111
1 ", the calling signal is converted from a calling name represented by a 12-digit decimal number into a binary number according to Table 1 (48 bits), and 4-bit" 0000 "and an 11-bit error control code are added thereto. It is 63 bits. The call name is a value unique to the transmitter and the receiver, and is given by the Minister of Posts and Telecommunications, and cannot be specified by the development designer.

[0010]

[Table 1]

This binary number conversion is such that no more than six “0” s or “1s” continue regardless of the value of the call name. Therefore, "0000""00"
01 "" 0010 "" 1111 "" 1101 "" 111 "
There are no six patterns of "0".

[0012] In recent years, the standard has changed and there is no call name. Accordingly, the obligation to transmit the first bit synchronization signal, the first frame signal, and the calling signal is eliminated, and the original bit synchronization signal, frame synchronization signal, and identification signal can be transmitted first.

[0013]

As described above, when communication is performed between the transmitting device and the receiving device, the first bit synchronization signal, the first frame synchronization signal, and the N-bit calling specified in the standard are called. A signal transmitting first, followed by a unique second bit synchronization signal, a second frame synchronization signal, a communication method for transmitting an identification signal for identifying a communication partner and a transmission data signal, the receiving device in the One frame signal or calling signal is not necessarily required, and it is sufficient to receive the second frame synchronization signal, determine the head of the identification signal, receive the identification signal, confirm the communication partner, and receive the transmission data.

That is, the bit synchronization signal is received to synchronize with the transmitting apparatus, and the head of the identification signal is determined by searching for the second frame synchronization signal in the bit string subsequently received. At this time, when synchronization with the transmitting device is performed in the first bit synchronization signal portion, the first frame synchronization signal, the ringing signal, the second bit synchronization signal, the second frame synchronization signal and the subsequent bit string Next, the second frame synchronization signal is searched.

Therefore, it is a condition of the second frame synchronization signal that the same bit string does not exist in the first frame synchronization signal, the calling signal, and the second bit synchronization signal.

Here, the calling name is "0000", "0001", "0010", "1111" by binary number conversion.
The patterns other than the six patterns “1101” and “1110” may appear in the call signal part. As for “0000”, “110000” obtained by combining two 4-bit strings is used.
11 ”may appear in the middle of the 8-bit string. “0001” “0010” “1111” “110”
The same applies to “1” and “1110”. In consideration of the above, the second frame synchronization signal is “000000” or “111”.
111 "or the like.

On the other hand, the frame synchronization signal desirably has high randomness in order to avoid erroneous detection, and often uses a pseudo-random code. "0000" in pseudo random code
No suitable one containing "00" or "111111" is found. The second frame synchronization signal may be longer than the calling signal, but the frame synchronization signal of 63 bits or more is too long, and the load on the receiving process is large. It is appropriate that the second frame synchronization signal is about 15 bits or 31 bits.

As described above, the second frame synchronization signal uniquely determined is the same as that of the first frame synchronization signal and the calling signal defined by the standard. It is difficult to achieve both.

In recent years, the standards have changed and the obligation to transmit the first bit synchronization signal, the first frame signal, and the call signal has been eliminated, and the original bit synchronization signal, the second frame synchronization signal, and the identification signal are transmitted first. I do. At this time, the receiving device may receive the second frame synchronization signal, determine the head of the identification signal, receive the identification signal, confirm the communication partner, and receive the transmission data.

However, there is a case where another wireless system, that is, a transmitting device for transmitting another message format exists near the receiving device. When the transmitting device transmits the first bit synchronization signal, the first frame synchronization signal, the calling name according to the conventional standard, and does not transmit the unique second frame synchronization signal, the identification signal, Issues.

The receiving device receives a signal from another wireless system,
When receiving a second frame synchronization signal and a transmission signal that does not include an identification signal, confirm that the second frame synchronization signal does not exist in the received signal to identify whether it is addressed to itself. Must. Therefore, a certain amount of time is required for receiving and searching for the second frame synchronization signal.

The intermittent reception standby as disclosed in Japanese Patent Application Laid-Open No. 10-198881 aims to reduce the current consumption of the receiving circuit. If the received identification signal is not addressed to itself, the reception is interrupted and the power supply of the receiving circuit is stopped. For a certain period of time.
However, as described above, if the signal is received for a certain period of time and the search for the second frame synchronization signal is performed to determine that the signal is not a signal to be originally received, the timing of turning off the receiving circuit is delayed, and as a result, the battery life is shortened. Decreases faster.

Further, a problem arises in a transmitting device and a receiving device that perform multi-channel reception standby. In the multi-channel reception standby mode, the receiving apparatus performs reception standby by sequentially switching a plurality of communication channels. If the received identification signal is not addressed to itself, the reception apparatus interrupts the reception and switches the communication channel to perform reception standby. The communication message format transmitted from the transmission device is the same as that in FIG. 13, and a plurality of communication channels (L)
, One communication channel is selected and the connection signal is repeatedly transmitted L times or more, and then the data signal is transmitted. Therefore, as described above, if the signal is received for a certain period of time to determine that the signal is not a signal to be originally received and the search for the second frame synchronization signal is performed, the timing of switching the communication channel is delayed. If there is a transmission signal from the other party, it cannot be received.

In addition, there is a case where the same signal as the second frame synchronization signal is accidentally included in the call signal portion and the signal following the call signal portion. In this case, the position determination of the identification signal is erroneously performed. . In the case where there is a transmitting device in the communication area where the same signal as the second frame synchronization signal is accidentally included in the paging signal, such a problem occurs every time the transmitting signal is received.

An object of the present invention is to provide a receiving apparatus for transmitting a first frame synchronization signal, a calling signal, a unique second frame synchronization signal, and an identification signal, which are defined in a standard, to a second apparatus. To accurately detect the frame synchronization signal and the identification signal, and for the original second frame synchronization signal, the transmission device that transmits the identification signal first, the reception signal where the second frame synchronization signal does not exist in the reception device Is to quickly determine the interruption of reception.

[0026]

According to the present invention, in order to solve the above-mentioned problems, when a transmitting apparatus and a receiving apparatus communicate with each other, the transmitting apparatus uses a first bit synchronization signal and a pseudo bit synchronization signal defined by a standard. A first frame synchronization signal that is a random code,
Transmitting an N-bit paging signal first, followed by a unique second bit synchronization signal, a second frame synchronization signal,
The receiving device that transmits the identification signal for identifying the communication partner and the transmission data signal, and receives either one of the two bit synchronization signals, detects (N +
It waits for the second frame synchronization signal after M) bits.

According to the above invention, the receiving apparatus detects the first frame synchronization signal and determines that the next N-bit calling signal and the M-bit second bit synchronization signal come next (N
Since the second frame synchronization signal is awaited after the (+ M) bits, the paging signal section does not search for the second frame synchronization signal.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be embodied in the form described in each claim.

That is, as in the first aspect of the present invention,
The transmitting device is defined in the standard, a first bit synchronization signal, a first frame synchronization signal is a pseudo-random code,
Transmitting an N-bit paging signal first, followed by transmitting a uniquely defined second bit synchronization signal, a second frame synchronization signal, an identification signal for identifying a communication partner and a transmission data signal, The receiving device that has received either of the two bit synchronization signals waits for the second frame synchronization signal after (N + M) bits when detecting the first frame synchronization signal. Then, by detecting the first frame synchronization signal, the receiving apparatus determines that the N-bit calling signal and the M-bit second bit synchronization signal will come next (N +
Since the second frame synchronization signal is awaited after the M) bits, the paging signal section does not search for the second frame synchronization signal.

Further, as in the second aspect of the present invention, the receiving apparatus which has received either one of the two bit synchronizing signals, when detecting the first frame synchronizing signal, performs the second bit synchronizing from at least N bits onward. A signal and a second frame synchronization signal are awaited. The receiving apparatus detects the first frame synchronization signal and determines that the next N-bit paging signal will come, and waits for the second bit synchronization signal after N bits. Since the synchronization signal is not searched for and the bit synchronization process is performed again using the second bit synchronization signal, the synchronization deviation with the transmission device can be reduced and the reception performance can be improved.

According to a third aspect of the present invention, the transmitting apparatus first transmits a unique second bit synchronization signal, a second frame synchronization signal, and an identification signal for identifying a communication partner. Subsequently, transmitting the transmission data signal, the receiving device having received the bit synchronization signal, simultaneously waits for the first frame synchronization signal and the second frame synchronization signal,
The reception is interrupted when the first frame synchronization is detected. Since the receiving apparatus waits for both the first frame synchronization signal and the second frame synchronization signal, the first bit synchronization signal, the first frame synchronization signal, and other signals such as transmitting the N-bit paging signal are transmitted. When the transmitting device is present near the receiving device, it is possible to quickly determine the interruption of the receiving. Also, there is no search for the second frame synchronization signal in the call signal section.

Further, the second frame synchronization signal is generated using the first frame synchronization signal. Since the second frame synchronization signal is generated using the first frame synchronization signal, the characteristics of the pseudo-random code can be used, and the capacity required for storing the two frame synchronization signals in the receiving device. Can be reduced.

Also, as in the fifth aspect of the present invention, the second frame synchronization signal is 0 and 1 of the first frame synchronization signal.
Is a signal obtained by inverting the bits for each bit, or the lower K1 bit + the upper K2 bit. Then, the second frame synchronization signal can be a pseudo-random code having a large inter-code distance from the first frame synchronization signal, and when the first frame synchronization signal and the second frame synchronization signal are simultaneously awaited. Thus, the two frame synchronization signals can be reliably identified by simple processing.

Further, as in the fifth aspect of the present invention, the identification signal and the transmission data signal are transmitted in Manchester code. Since the Manchester code is used, the first frame synchronization signal and the second frame synchronization signal do not appear in the identification signal portion or the transmission data signal. Therefore, the identification signal portion and the transmission data signal portion do not accidentally include the same signal as the second frame synchronization signal, and the position of the identification signal is not erroneously determined even when the transmission signal is received from the middle.

As described in claim 6, the receiving apparatus waits for both the first frame synchronization signal and the second frame synchronization signal in the intermittent reception standby and detects the first frame synchronization. The reception is interrupted. Also, the transmitting device is a unique second bit synchronization signal,
The data signal is transmitted after repeatedly transmitting the second frame synchronization signal and the identification signal for identifying the communication partner. Since the first frame synchronization signal is detected and determined when the signal is not a signal to be received, the reception time is shortened and the battery life can be extended.

According to a seventh aspect of the present invention, when the receiving apparatus waits for both the first frame synchronization signal and the second frame synchronization signal in the multi-channel reception waiting state and detects the first frame synchronization, The reception is interrupted and the communication channel is switched. Since the first frame synchronization signal is detected and determined when the signal is not a signal to be originally received, the cycle for switching the communication channel is shortened, and the reception of the transmission signal from the communication partner can be ensured.

[0037]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a radio transmitting / receiving apparatus according to Embodiment 1 of the present invention. Receiving means 3 for receiving a wireless signal 2 from the other party's wireless transmitting and receiving device via the antenna 1 and demodulating it into a received message such as a connection signal and a data signal to communicate with the other party's wireless transmitting and receiving device
A receiving circuit control means 4 for controlling the power on / off of the receiving means 3 and a receiving frequency, a transmitting means 5 for modulating a transmission message and transmitting a radio signal 2 to a partner radio transmitting / receiving apparatus via the antenna 1; A transmission circuit control means 6 for controlling the power on / off of the transmission means 5, a transmission frequency, etc., decodes a received message from the receiving means 3 and performs a receiving process, and assembles a transmitted message and transfers it to the transmitting means 5, for example. It comprises a communication control means 7 for controlling, for example, a microcomputer.

The bit synchronization processing means 8 detects the bit synchronization signal in the received message from the receiving means 3 and synchronizes with the transmitting device. There is a first frame synchronization signal detecting means 9 for detecting the frame synchronization signal for a predetermined time, and a second frame synchronization signal detecting means 10 for detecting the second frame synchronization signal in the received message for a predetermined time. . The communication control means 7 determines the head of the identification signal based on the second frame synchronization signal, confirms the communication partner, and receives the transmission data. The first frame synchronization signal is stored in the first frame synchronization signal storage unit 11 and the second frame synchronization signal is stored in the second frame synchronization signal storage unit 12 in advance for comparison with the received data. .

As the identification code, a unique code is used for each wireless transmission / reception device to identify the communication partner, and the identification code of the wireless transmission / reception device itself and the identification code of the communication partner are stored in the identification code storage means 13 at the time of initialization. I do. Communication control means 7
Reads out the identification code from the identification code storage means 13 and, at the time of transmission, inserts the identification code of the communication partner into the transmission message as a code for identifying the recipient. At the time of reception, only the message in which the recipient identification code in the received message matches its own identification code is decoded. If necessary, insert its own identification code as a code to identify the sender in the transmission message, and the receiver confirms that the sender identification code in the reception message matches the identification code of the communication partner May be.

FIGS. 2 and 3 show message formats communicated between the radio transmitting / receiving apparatuses shown in FIG.

The transmitting apparatus first transmits a first bit synchronization signal 21, a first frame synchronization signal 22, which is a pseudo-random code, and a 63-bit calling signal 23, which are defined by the standard. Some second bit synchronization signal 2
4. A second frame synchronization signal 25, an identification signal 26 for identifying a communication partner, and a transmission data signal 27 are transmitted.
First bit synchronization signal 21, first frame synchronization signal 2
2. The call signal 23 is as described in the conventional example.

The receiving device receiving the signal receives the bit synchronization signal 21 or 24 and synchronizes with the transmitting device.
Subsequently, the head of the identification signal 26 is determined by searching for the second frame synchronization signal 25 in the bit string received subsequently. When the identification code 26 matches its own, the transmission data signal 27
To receive.

Here, in the present invention, the method 1 shown in FIG.
After the bit synchronization signal processing as described above, both the first frame synchronization signal and the second frame synchronization signal are detected (FIG. 2). When the transmission message is received from the beginning as shown in (1-1) in FIG. 2, after the bit synchronization processing, the first frame synchronization signal is detected first, so that the calling signal (63 bits) and the second bit synchronization are obtained. The signal (64 bits) ignores the received telegram (30 in FIG. 2) and starts searching for the second frame synchronization signal after 127 bits (29 in FIG. 2).

As shown in (1-2) in FIG. 2, when reception starts in the middle of the first bit synchronization signal to the second bit synchronization signal of the transmission message, after the bit synchronization signal processing, Then, both the frame synchronization signal and the second frame synchronization signal are detected, the second frame synchronization signal is detected, and the identification code is confirmed (31 in FIG. 2).

As described above, the receiving apparatus determines the receiving position in the message format by detecting the first frame synchronization signal, and then receives the N-bit calling signal and the M-bit second bit synchronization signal. Judge and wait for the second frame synchronization signal after (N + M) bits. Therefore, there is no search for the second frame synchronization signal in the paging signal portion which may include the same bit sequence as the second frame synchronization signal. Further, while ignoring the received message, the communication control means (microcomputer or the like) can be operated as a power saving operation to extend the battery life.

After the bit synchronization signal processing as in the method 2 of (2) in FIG. 2, both the first frame synchronization signal and the second frame synchronization signal are detected (28 in FIG. 2). When the first frame synchronization signal is detected first as shown in (2-1) in FIG. 2, the calling signal (63 bits) ignores the received telegram (32 in FIG. 2), and the second signal from the 63 bits onward. Bit synchronization processing is performed by the bit synchronization signal (33 in FIG. 2).
A search for a second frame synchronization signal is started (2 in FIG. 2).
9). At this time, in the first bit synchronization signal, the bit synchronization processing is performed using 16 bits out of 24 bits, but in the second bit synchronization signal, the bit synchronization processing can be performed using all 64 bits, so that synchronization accuracy is reduced. Can be enhanced. For this reason, it is possible to reduce the synchronization deviation with the transmitting apparatus that occurs between the subsequent second frame synchronization signal and the last transmission data signal, thereby improving the reception performance.

When reception is started in the middle of the first bit synchronization signal to the second bit synchronization signal of the transmission message as shown in (2-2) in FIG. Then, both the frame synchronization signal and the second frame synchronization signal are detected, the second frame synchronization signal is detected, and the identification code is confirmed (31 in FIG. 2).

As described above, the receiving device determines the receiving position in the message format by detecting the first frame synchronization signal, and then determines that an N-bit calling signal comes, and
It waits for the second bit synchronization signal after the bit. Therefore, the second frame synchronization signal is not searched for in the paging signal portion which may include the same bit sequence as the second frame synchronization signal, and the bit synchronization processing is performed again by making the best use of the second bit synchronization signal. Is performed, the synchronization deviation with the transmitting apparatus can be reduced, and the receiving performance can be improved.

The conventional method is shown in FIG. After the bit synchronization processing, only the second frame synchronization is searched. If the same bit string as that of the second frame synchronization signal is included in the paging signal, the position of the identification code is erroneously determined as shown in (3-1) in FIG. Become. Also, when the identification code coincides with its own, transmission data is erroneously received as shown in (3-2) in FIG. As described above, even if the signal should be received, it cannot be received. If the same bit string as that of the second frame synchronization signal is included in the call signal at the timing when the reception process is started from the beginning of the transmission message at all times, it may not be possible to receive any number of times.

If the same bit string as that of the second frame synchronization signal is not included in the calling signal, (3) in FIG.
197 bits must be received after performing the bit synchronization processing as in -3) until it is confirmed that the second frame synchronization signal does not exist. The receiving time becomes longer, which affects the battery life.

The details of the receiving operation of the method 1 (1) in FIG. 2 are shown in the flowchart of FIG.

The communication control means determines whether or not there is a radio signal transmitted by someone (step 101). If there is a carrier, there is a radio signal, so it is first determined for a certain time whether a bit synchronization signal for synchronization exists (step 102), and if there is, a bit synchronization process is performed by bit synchronization processing means (step 102). 103). Next, it is determined whether or not the second frame synchronization signal exists (step 104), and if so, it is determined whether or not the next identification code matches its own prestored one (step 105). When they match, the transmission data is received (step 106).

Since the receiver does not know when a carrier will come, the presence or absence of a carrier (step 101) returns to step 101 again for a certain T time even if there is no carrier, and waits for a carrier to come. If the time has exceeded T, reception is interrupted (step 107). Similarly, the presence or absence of the bit synchronization signal (step 102) is not known to the receiver when the bit synchronization signal starts, so even if there is no bit synchronization signal, the process returns to step 102 again for a certain T time and returns to the bit synchronization signal. Wait for the coming. If the time has exceeded T, reception is interrupted (step 107). The above is the same as the conventional case.

In the message formats shown in FIGS. 2 and 3, the T time is 79 bits. This is the number of bits from when the bit synchronization processing is performed to when all the second frame synchronization signals are received, and the second frame synchronization signal (31 bits) is added to the second bit synchronization signal (64 bits). This is a value obtained by subtracting 16 bits necessary for the bit synchronization processing.

In addition to the above, in the present invention, when there is no second frame synchronization signal (step 104), it is determined whether the first frame synchronization signal exists (step 108). When the first frame synchronization signal is present, a bit wait is performed as a power saving operation between M + N bits (the number of bits of the call signal and the second bit synchronization signal) (step 109). Thereafter, the presence or absence of the second frame synchronization signal is determined (step 110), and if present, it is determined whether or not the next identification code matches its own stored in advance (step 105). The transmission data is received (step 106).

The presence or absence of the first frame synchronization signal (step 108) and the presence or absence of the second frame synchronization signal (step 1)
Regarding 04), the receiver does not know when the frame synchronization signal starts, so even if there is no frame synchronization signal, the process returns to step 104 again for a certain T time and waits for the arrival of the frame synchronization signal. If the time has exceeded T, reception is interrupted (step 107). Regarding the presence / absence of the second frame synchronization signal (step 110), the receiving position of the second frame synchronization signal is known, so if there is no frame synchronization signal, the reception is immediately interrupted (step 107).

Although (2) method 2 in FIG. 2 is not shown, it is sufficient to wait for N bits in step 109 and insert a bit synchronization signal presence / absence judgment and a bit synchronization process between steps 109 and 110. . At this time, since the position where the second bit synchronization signal should come is known, if there is no bit synchronization signal, the reception is immediately stopped.

(Embodiment 2) The above method is for transmitting a first bit synchronization signal, a first frame signal, and a call signal according to a standard. In recent years, the standards have changed and the obligation to transmit the first bit synchronization signal, first frame signal, and paging signal has been eliminated, and the originally defined bit synchronization signal, second frame synchronization signal, and identification signal are transmitted first. It is possible to do.

At this time, it is possible to quickly determine the interruption of reception when another transmitting apparatus that transmits according to the conventional standard exists near the receiving apparatus.

The message format is shown in FIG. 5 and FIG.

As shown in (1) in FIG. 5 and FIG.
It transmits a second bit synchronization signal 24, a second frame synchronization signal 25, an identification signal 26 for identifying a communication partner, and a transmission data signal 27 uniquely determined. The first bit synchronization signal, the first frame synchronization signal, and the calling signal are not transmitted. This is the transmission signal from the other party that the receiving device should receive.

The receiving apparatus receiving the signal receives the bit synchronizing signal 24 and synchronizes with the transmitting apparatus as shown in (1) in FIG. 5, and subsequently, the first frame synchronizing signal and the second frame synchronizing signal Perform both signal and signal detection. The second frame synchronization signal is detected in the received bit string and the identification signal 26 is detected.
Is determined (35 in FIG. 5). The transmission data signal 27 is received when the identification code 26 matches its own.

Apart from this transmission signal, there is a transmission signal from a partner that the receiving device should not receive. That is, there is a case where another wireless system, that is, a transmitting device that transmits another message format exists near the receiving device. This transmitting apparatus is configured to transmit a first bit synchronization signal 21, a first frame synchronization signal 22, and a call signal 23 according to a conventional standard.
And a unique second frame synchronization signal 2
4. The identification signal 25 is not transmitted.

The receiving apparatus receiving the signal receives the bit synchronization signal 21 and synchronizes with the transmitting apparatus, as shown in (2) in FIG. 5, and subsequently, the first frame synchronization signal and the second frame synchronization signal. Perform both signal and signal detection. The first frame synchronization signal is detected in the received bit string, and the reception is interrupted (36 in FIG. 5).

As described above, by detecting the first frame synchronization signal, the receiving apparatus can quickly determine the interruption of reception when another transmitting apparatus is present near the receiving apparatus. Also, there is no search for the second frame synchronization signal in the call signal section.

The conventional method is shown in (3) of FIG. After the bit synchronization processing, only the second frame synchronization is searched. If the same bit string as that of the second frame synchronization signal is included in the paging signal, it is not possible to determine whether to interrupt reception until 63 bits of the paging signal is received as shown in (3-1) in FIG. Further, when the same signal as the own identification code exists in the calling signal, the transmission data is erroneously received as shown in (3-2) in FIG.

FIG. 7 is a flowchart showing details of the receiving operation.

The communication control means determines whether or not there is a radio signal transmitted by someone (step 101). If there is a carrier, there is a radio signal, so it is first determined for a certain time whether a bit synchronization signal for synchronization exists (step 102), and if there is, a bit synchronization process is performed by bit synchronization processing means (step 102). 103). Next, it is determined whether or not the second frame synchronization signal exists (step 104), and if so, it is determined whether or not the next identification code matches its own prestored one (step 105). When they match, the transmission data is received (step 106).

Since the receiver does not know when a carrier comes, the presence or absence of a carrier (step 101) returns to step 101 again for a certain T time and waits for a carrier even if there is no carrier. If the time has exceeded T, reception is interrupted (step 107). Similarly, the presence / absence of the bit synchronization signal (step 103) is not known to the receiver when the bit synchronization signal starts, so even if there is no bit synchronization signal, the process returns to step 103 again for a certain T time to return to the bit synchronization signal. Wait for the coming. If the time has exceeded T, reception is interrupted (step 107). The above is the same as the conventional case.

In addition, when there is no second frame synchronization signal (step 104), it is determined whether the first frame synchronization signal exists (step 108).

In this embodiment, when the first frame synchronization signal exists, the reception is immediately interrupted. Regarding the presence / absence of the first frame synchronization signal (step 108) and the presence / absence of the second frame synchronization signal (step 104), the receiver does not know when the frame synchronization signal starts. During the time T, the process returns to step 104 again and waits for the arrival of the frame synchronization signal. In the message format of FIG. 5, the T time is 79 bits.

(Embodiment 3) Next, the effect of the present invention in intermittent reception standby will be described.

FIG. 8 shows a message format (A) communicated in intermittent reception standby and a general message format (according to the standard) without intermittent reception standby (B).

The message format (A) communicated in the intermittent reception standby mode is roughly divided into the following two.

The first is a repetitive transmission section of the connection signal. One connection signal is composed of a second bit synchronization signal 41, a second frame synchronization signal 42, a control code 43 and a partial identification code 44. The receiver receives the second bit synchronization signal 41
, And synchronizes with the sender, receives the second frame synchronization signal 42, and determines the beginning of the control code 43.
The control code 43 includes the number of times of transmission of the connection signal, and the partial identification code 44 is a 4-digit value of the 12-digit identification code of the receiver.

The second is a data signal, and the control code 4
5, an identification code 46 and transmission information 47. Upon receiving the identification signal 46, all 12 digits of the identification code of the receiver are confirmed, and the transmission information 47 is received. The control code 45 includes information indicating that the control code itself is a part of the data signal. The transmission information 47 is information to be transmitted from the sender to the receiver.

Here, the sender changes the extraction part of the partial identification code 44 every time the connection signal is repeated. The first four digits of the identification code 46 for the connection signal, the middle four digits for the second time,
Include the lower 4 digits for the third time. From the fourth time again, the top four
Digit, middle 4 digits, lower 4 digits. The receiver sets the order in advance, that is, the upper four digits of the identification code 46 at the first time of the connection signal, the middle four digits at the second time, the lower four digits at the third time,.
And the extraction position of the received partial identification code 44 can be known from the transmission count value in the control code 43.

Therefore, the extracted part of the partial identification code changes each time the connection signal is repeated, so that even if an identification code similar to its own identification code exists, the receiving apparatus can identify the received signal while repeatedly receiving the connection signal and can quickly receive the signal. Can be interrupted. Even if the number of bits of the identification code is large, only a part of the number is included in the connection signal, so that the connection signal does not become long.

The general message format (according to the standard) (B) in which the intermittent reception standby is not performed is roughly composed of a signal of the standard and transmission information. The standard signal includes a first bit synchronization signal 48, a first frame synchronization signal 49, and a call signal 50.

In FIG. 9, it is assumed that there is a transmission signal from another person in intermittent reception standby, that is, a transmission signal (1) in a general message format in which intermittent reception standby is not performed. This is the message format shown in FIG.

The receiver intermittently waits for a connection signal to be searched and received intermittently at regular time intervals T1 as shown in (2). In the present invention, the reception of the frame synchronization signal (first frame synchronization signal) in the standard signal is interrupted as in (3a), so that the reception time is shortened and the battery life can be extended.

Conventionally, as in (3b), reception is waited for a certain period of time, and it is confirmed that there is no original frame synchronization signal (second frame synchronization signal). slow. If the paging signal happens to include the same bit string as the second frame synchronization signal, the determination is further delayed.

As described above, according to the present invention, the first frame synchronization signal is detected and determined when the signal is not a signal to be originally received.
The purpose of the battery life can be further extended.

(Embodiment 4) Next, the effect of the present invention in a multi-channel reception standby mode will be described.

The receiver performs a multi-channel reception standby for sequentially switching a plurality of (N) communication channels to search for and receive a connection signal, and performs a partial identification signal in the connection signal and a part of the identification signal of the receiver. When the numbers do not match, the reception is interrupted, the communication channel is switched, and a search for a connection signal is performed.
One communication channel is selected and a connection signal is repeatedly transmitted N times or more, and then a data signal is transmitted.

The message format communicated in the multi-channel reception standby mode is the same as that shown in FIG. FIG. 8B shows a general message format in which a transmission signal from another party, that is, a multi-channel reception standby is not performed. Here, consider a problem when the two are mixed.

FIG. 10 (1) and (2) show the operation of senders A and B, and (3) shows the operation of receiver C to communicate with sender B.

The sender A, which is another person from the viewpoint of the receiver C, is 1
Sender B, which is a communication partner on a channel, transmits on two channels. As shown in FIG. 10, transmission signals may be transmitted from senders A and B almost simultaneously.

The receiver C alternately waits for the connection signal of channel 1 and channel 2 and, if there is no signal addressed to itself, interrupts reception and switches the communication channel to search for another connection signal. Thus, the receiver C previously received the transmission signal from the sender A on one channel as shown in (3) in FIG. According to the present invention, a frame synchronization signal (first frame synchronization signal) in a standard signal is detected, reception is interrupted, and the reception frequency is switched to two channels. Next, the connection signal from the sender B is received, and reception (completion of reception) can be performed until the end of the data signal while confirming the matching of the identification signal.

Conventionally, as shown in (4) in FIG. 10, reception is waited for a certain period of time, and it is confirmed that there is no second frame synchronizing signal. Therefore, the connection signal from the sender B may not be able to be received at the time of switching from channel 1 to channel 2. If the paging signal accidentally includes the same bit string as the second frame synchronization signal, the determination is further delayed.

As described above, the first frame synchronization signal is detected and determined when the signal is not a signal to be originally received. Therefore, in the multi-channel reception standby mode, the communication channel switching cycle is shortened and the transmission signal from the communication partner is not transmitted. Reception can be ensured.

When the receiver waits for multi-channel reception while switching the N channels, it is necessary to repeat the connection signal N times or more in order to reliably receive the data in one transmission.

Finally, a second frame synchronization signal uniquely determined will be described. In order to avoid erroneous detection, it is desirable that the distance between the first frame synchronization signal and the code is large and the randomness is high, and about 15 bits or 31 bits.

First, the first frame synchronization signal will be described.
As shown in FIG. 11, as a characteristic of the pseudo-random code, when the repetition signal of the first frame synchronization signal and the first frame synchronization signal are compared and collated, even if the bit position is shifted even by one bit, (1) or (3) ), The bit difference is 16 bits. If there is a deviation, even if it is N bits (N is a positive integer), the difference always becomes 16 bits. Then, the bit difference becomes 0 only when the bit positions match as in (2).

Therefore, the second frame synchronization signal is generated using the first frame synchronization signal. The advantage is that the above-mentioned characteristics of the pseudo-random code can be used, and since the first frame synchronization signal and the second frame synchronization signal are related, it is not necessary to store two frame synchronization signals in the receiving device. . That is, the storage means (ROM of the microcomputer) can be obtained from the first frame synchronization signal without newly storing the second frame synchronization signal.
Required capacity can be reduced.

Table 2 shows some specific examples.

[0098]

[Table 2]

Table 1 shows the first frame synchronization signal. In the standard, since the first frame synchronization signal is output only once, the first half 16 bits and the second half 15 bits of the first frame synchronization signal (1) are reversed as shown in (2) of Table 2. Combine in order. If generated in this way, (2) is the same pseudo-random code as the first frame synchronization signal, and the bit difference from the first frame synchronization signal in (1) is 16 bits.

Alternatively, when it is desired to make the second frame synchronization signal 15 bits, 15 bits are extracted from the first frame synchronization signal (1). However, as shown in (3) in Table 2, the first frame synchronization signal is extracted. The first 7 bits and the second 8 bits of the signal (1) are combined in reverse order. If generated in this way, (3) is not included in the first frame synchronization signal, though it is a part included in the first frame synchronization signal.

As described above, in the method of combining the second half K1 bit of the first frame synchronization signal and the first half K2 bit in the reverse order, the first half K2 bit of the first frame synchronization signal and the second half K2 of the second frame synchronization signal are combined. Since the bits are the same, the bit difference becomes extremely small when comparison and collation are performed at this position. Therefore, attention must be paid to the bit difference between the immediately preceding K1 bit of the first frame synchronization signal and the first K1 bit of the second frame synchronization signal.

Similarly, the second half K of the first frame synchronization signal
Since 1 bit is the same as the first half K1 bit of the second frame synchronization signal, the bit difference becomes extremely small when comparing and collating at that position. Immediately after the first frame synchronization signal K2
Attention must be paid to the bit difference between the bit and the second half K2 bit of the second frame synchronization signal.

In consideration of the above, the number of bits K1 and K2
And the same number is desirable, but the number of bits does not matter if it is an integer.

The bit string of the first frame synchronization signal (1) is inverted as shown in (4) in Table 2. That is,
If there is a bit string of “1110”, this is set to “0111”. At this time, (4) is a pseudo random code. Alternatively, when it is desired to make the second frame synchronization signal 15 bits, as shown in (5) in Table 2, the first 7 bits and the latter 8 bits of (4), which is a bit string inversion, are combined in reverse order.

In the method (4), the bit difference from the first frame synchronization signal in the method (1) is 10 to 20 bits, which may be smaller than that in the method (2).

As shown in (6) in Table 2, the bits of the first frame synchronization signal (1) are inverted for each bit. That is, if there is a bit string of “1110”, it is changed to “00”.
01 ". At this time, (6) is a pseudo random code. Alternatively, when it is desired to make the second frame synchronization signal 15 bits, as shown in (7) in Table 2, the first 7 bits and the latter 8 bits of (6), which are bit inverted, are combined in the reverse order.

In the method (6), the bit difference between the first frame synchronization signal and the first frame synchronization signal is 15 bits as shown in FIG. Only when they overlap, there is a 31-bit difference. That is, when waiting for the first frame synchronization signal and the second frame synchronization signal at the same time, if the bit difference is 0 after comparison with the second frame synchronization signal, detection of the second frame synchronization signal, If the difference is 31 bits, it can be determined that the first frame synchronization signal has been detected. That is, it is possible to easily and surely identify two frame synchronization signals by one comparison without comparing and collating each.

As described above, since the second frame synchronization signal is generated using the first frame synchronization signal, the characteristics of the pseudo random code can be used, and the two frame synchronization signals are stored in the receiving device. Sometimes the required capacity can be reduced.

Further, if the second frame synchronization signal is a signal obtained by inverting 0 and 1 of the first frame synchronization signal for each bit, the second frame synchronization signal is interposed between the first frame synchronization signal and the code. A pseudo-random code having a large distance can be used, and when the first frame synchronization signal and the second frame synchronization signal are simultaneously awaited, the two frame synchronization signals can be reliably identified by simple processing.

Although the bit difference is used as a basis for determining the detection of the frame synchronization signal, it may have a width in consideration of a bit error. For example, if a bit difference between the first frame synchronization signal and the first frame synchronization signal shown in FIG.
If it is 31 bits, it is determined to be the second frame synchronization signal.

The second frame synchronization signal determined as described above is preferably a bit string that is not included in the identification code of the transmission signal or the transmission data signal. That is, when the transmission signal is received from the middle, the search for the second frame synchronization signal is performed in the identification signal portion and the transmission data signal portion. At this time, if the identification signal portion and the transmission data signal portion include the same signal as the second frame synchronization signal by chance, the next signal is erroneously determined as the identification signal and reception processing is performed. Reception of a transmission signal from the middle in this way is frequently performed in intermittent reception standby or multi-channel reception standby.

Similarly, in the present invention, it is desirable that the identification code and the transmission data signal do not include the first frame synchronization signal. In other words, when a transmission signal is received from the middle, if the identification signal portion and the transmission data signal portion contain the same signal as the first frame synchronization signal by chance, the next signal is erroneously determined as a call signal and the reception process is performed. I do.

In such a case, a method of transmitting the identification signal and the transmission data signal in Manchester code can be considered.
This is a coding method in which one bit of a binary number is converted into two bits as shown in Table 3 and transmitted. For example, "0" is replaced with "10". Alternatively, “1” is replaced with “01”.

[0114]

[Table 3]

As a result, the identification signal and the transmission data signal do not include "11" or "00". That is, since the first frame synchronization signal and the second frame synchronization signal do not appear in the identification signal portion or the transmission data signal portion, even if the transmission signal is received from the middle, the position determination of the call signal or the identification signal is not erroneously determined. .

[0116]

As is apparent from the above description, according to the communication method of the present invention, the first frame synchronization signal and the calling signal defined by the standard, the second frame synchronization signal uniquely defined, For the transmitting device that transmits the identification signal, to accurately detect the second frame synchronization signal and the identification signal in the receiving device, and also uniquely determined, the second frame synchronization signal, the identification signal first For the transmitting device to transmit,
The receiving device can quickly determine whether to interrupt reception of a received signal in which the second frame synchronization signal does not exist.

In particular, since the first frame synchronization signal is detected and determined when it is not a signal to be originally received, the reception time is shorter than when the identification signal is determined, and the battery life is extended when intermittent reception is awaited. When communication is performed from one communication channel using one communication channel, the communication channel switching cycle in the receiving device can be shortened.

Further, the following effects are exhibited corresponding to each claim.

[0119] 1. By detecting the first frame synchronization signal, the receiving apparatus determines that the N-bit calling signal and the M-bit second bit synchronization signal will come next, and waits for the second frame synchronization signal after (N + M) bits. Therefore, there is no need to search for the second frame synchronization signal in the call signal section.

[0120] 2. The receiving apparatus detects the first frame synchronization signal, determines that the next N-bit paging signal will come, and waits for the second bit synchronization signal and the second frame synchronization signal after N bits. Does not search for the second frame synchronization signal, and performs the bit synchronization process again using the second bit synchronization signal. Therefore, it is possible to reduce the synchronization deviation with the transmission device and improve the reception performance.

3. Since the receiving apparatus waits for both the first frame synchronizing signal and the second frame synchronizing signal, other transmitting apparatuses such as transmitting the first bit synchronizing signal, the first frame synchronizing signal, and the N-bit paging signal Can be quickly determined when reception exists near the receiving device. Further, there is no search for the second frame synchronization signal in the call signal section.

4. Since the second frame synchronization signal is generated using the first frame synchronization signal, the characteristics of the pseudo random code can be utilized, and the capacity required when storing two frame synchronization signals in the receiving device is reduced. it can.

5. Since the second frame synchronization signal is the lower-order K1 bits + the upper-order K2 bits of the first frame synchronization signal, it can be a pseudo-random code having a large inter-code distance from the first frame synchronization signal. In addition, when the first frame synchronization signal and the second frame synchronization signal are simultaneously awaited, the two frame synchronization signals can be reliably identified by simple processing.

6. Since the Manchester code is used, the first frame synchronization signal and the second frame synchronization signal do not appear in the identification signal portion or the transmission data signal. Therefore, the identification signal portion and the transmission data signal portion do not accidentally include the same signal as the second frame synchronization signal, and the position determination of the identification signal is not erroneously determined even when the transmission signal is received halfway.

7. In the intermittent reception standby, the first frame synchronization signal is detected and determined when it is not a signal to be originally received, so that the reception time is shortened and the battery life can be extended.

8. In the multi-channel reception standby mode, the first frame synchronization signal is detected and determined when it is not a signal to be originally received, so that the communication channel switching cycle is shortened and the transmission signal from the communication partner can be reliably received. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram of a wireless transmission / reception device in a communication method according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a communication message format of the apparatus and an operation of a receiver.

FIG. 3 is a diagram following FIG. 2;

FIG. 4 is a flowchart for explaining the operation of the receiver in the apparatus.

FIG. 5 is a diagram showing a communication message format and an operation of a receiver in the communication method according to the second embodiment of the present invention.

FIG. 6 is a diagram following FIG. 5;

FIG. 7 is a flowchart illustrating an operation of a receiver in the communication method.

FIG. 8 is a diagram showing a communication message format in a communication method according to the third and fourth embodiments of the present invention.

FIG. 9 is a chart illustrating operations of a sender and a receiver according to a third embodiment of the present invention.

FIG. 10 is a chart illustrating operations of a sender and a receiver according to a fourth embodiment of the present invention.

FIG. 11 is a view for explaining position detection of a frame synchronization signal in the communication method of the present invention.

FIG. 12 is another diagram for explaining position detection of a frame synchronization signal in the communication method of the present invention.

FIG. 13 is a diagram showing a communication message format of the communication method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wireless antenna 2 wireless signal 3 receiving means 4 receiving circuit controlling means 5 transmitting means 6 transmitting circuit controlling means 7 communication controlling means 8 bit synchronization processing means 9 first frame synchronization detecting means 10 second frame synchronization detecting means 11 first Frame synchronous storage means 12 Second frame synchronous storage means 13 Identification code storage means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K034 AA06 AA07 BB01 DD01 EE03 HH01 HH02 HH09 PP02 PP05 5K047 AA04 BB01 GG04 HH01 HH42 KK03 MM02 MM11

Claims (8)

[Claims] 1. A communication method for performing communication between a transmitting device and a receiving device, wherein the transmitting device includes a first bit synchronization signal, a first frame synchronization signal that is a pseudo random code, and a first An N-bit paging signal is transmitted first, followed by an M-bit second bit synchronization signal, a second frame synchronization signal, an identification signal for identifying a communication partner, and a transmission data signal, which are not defined in the standard. The receiving device receives the first bit synchronization signal or the second bit synchronization signal, synchronizes with the transmission device, detects the second frame synchronization signal, and detects the identification signal. Receiving the identification signal, confirming the communication partner, receiving the transmission data signal, and receiving one of the two bit synchronization signals, the receiving device determines the first signal. Upon detection of a chromatography beam synchronization signal (N
+ M) The communication method characterized by waiting for the second frame synchronization signal after the bit. 2. A communication method for performing communication between a transmitting device and a receiving device, wherein the transmitting device includes a first bit synchronization signal, a first frame synchronization signal that is a pseudo random code, and a first Transmitting an N-bit paging signal first, followed by transmitting a second bit synchronization signal, a second frame synchronization signal, an identification signal for identifying a communication partner, and a transmission data signal which are not defined in the standard; The device detects the first bit synchronization signal or the second bit synchronization signal and synchronizes with the transmission device, detects the second frame synchronization signal and determines the head of the identification signal, Upon receiving the identification signal, confirming the communication partner, receiving the transmission data signal, and receiving one of the two bit synchronization signals, the receiving apparatus detects the first frame synchronization signal. Communication method is characterized in that at least N bits after awaiting the second bit synchronizing signal when the. 3. A communication method for performing communication between a transmitting device and a receiving device, wherein the transmitting device identifies a second bit synchronization signal, a second frame synchronization signal, and a communication partner that are not defined in a standard. First send an identification signal for
Subsequently, a transmission data signal is transmitted, the receiving device receives the second bit synchronization signal, synchronizes with the transmission device, detects the second frame synchronization signal, and sets the beginning of the identification signal. Judgment, receiving the identification signal and confirming the communication partner, while receiving the transmission data signal, the receiving device that has received the bit synchronization signal, specified in the standard, a first pseudo-random code A communication method comprising: waiting for both a frame synchronization signal and the second frame synchronization signal; and interrupting reception when the first frame synchronization signal is detected. 4. The communication method according to claim 1, wherein the second frame synchronization signal is generated using the first frame synchronization signal. 5. The second frame synchronization signal is a signal obtained by inverting 0 and 1 of the first frame synchronization signal bit by bit, or a lower K1 bit + an upper K2 bit thereof.
4. The communication method according to 2 or 3. 6. The transmission system according to claim 1, wherein the identification signal and the transmission data signal are transmitted in Manchester code.
The communication method described. 7. A receiving apparatus intermittently waits every predetermined time T1 to search for and receive a bit synchronization signal, performs an intermittent reception standby, and receives an identification signal to determine a communication partner. The search for the bit synchronization signal is interrupted until after the time T1, and the transmitting apparatus repeatedly transmits three of the second bit synchronization signal, the second frame synchronization signal, and the identification signal not specified in the standard for the predetermined time T1 or more. 4. The communication method according to claim 1, wherein the data signal is transmitted after the transmission. 8. A receiving apparatus performs multi-channel reception standby for sequentially switching a plurality of (L) communication channels, searching for and receiving a bit synchronization signal, and receiving an identification signal to confirm a communication partner. When the reception is interrupted and the communication channel is switched to search for a bit synchronization signal, the transmitting apparatus selects one communication channel from a plurality (L) of communication channels and selects a second communication channel which is not defined in the standard. 4. The communication method according to claim 1, wherein the data signal is transmitted after repeatedly transmitting three of the bit synchronization signal, the second frame synchronization signal, and the identification signal L times or more.