JP4894538B2 - Data receiving apparatus, data receiving control method and program - Google Patents

Description

  The present invention relates to a data reception device, a data reception control method, and a program.

  In a communication system such as a trunked radio system composed of a base station and a mobile station, as a method for checking whether or not a mobile station has called to the mobile station, for example, as defined in ANSI / TIA / EIA 102, There is a case in which a station transmits control information and a mobile station receives this information when waiting.

  However, in recent years, there has been a demand for miniaturization of a portable terminal that performs the function of a mobile station, and accordingly, the volume of a battery mounted on the mobile station needs to be miniaturized. As a result, it is difficult to expect a sufficient electric capacity of the battery, and a power saving operation of the mobile station is required.

However, when the mobile station constantly receives the above-mentioned control information during standby, there is a problem that power consumption required for the reception operation cannot be avoided, and thus power saving of the operation of the mobile station is hindered.
Therefore, as a technique for solving this problem and realizing power saving operation, for example, the base station specifies the broadcast information for calling each mobile station in a specification so that it is transmitted at a predetermined timing for each mobile station. It is conceivable to use a technique (see Non-Patent Document 1). According to this method, each mobile station normally calls while performing intermittent reception in which the vicinity of the timing at which the broadcast information addressed to the mobile station is transmitted is preferentially received and the reception operation in other periods is suspended. It becomes possible to receive.

  In addition, as a structure of the mobile station which performs power saving operation | movement, what is shown, for example in FIG. 12 can be considered. As illustrated, the mobile station includes a system control unit 101, an RF (Radio Frequency) power control unit 102, an RF unit 103, a digital conversion unit 104, a frame division unit 105, and FEC (Forward Error Correction: A forward error correction) decoding unit 106 and a message decoding unit 107 are included.

The system control unit 101 supplies power to each unit of the data receiving apparatus including the RF power supply control unit 102, and applies other predetermined control. The RF power supply control unit 102 connects or cuts off a current path for supplying power from the system control unit 101 to the RF unit 103 in accordance with an instruction from the system control unit 101, thereby controlling power consumption by the RF unit 103. The RF unit 103 receives a modulated wave representing data constituting the frame, generates a baseband signal, and supplies this to the digital conversion unit 104. The digital conversion unit 104 determines a dibit value represented by each symbol period of the baseband signal supplied from the RF unit 103, and corresponds to a continuation of frames represented by the modulated wave received by the RF unit 103 based on the determination result. Data to be reproduced is supplied to the frame dividing unit 105. The frame division unit 105 divides the data supplied from the digital conversion unit 104 into portions corresponding to individual frames, and supplies the obtained frames to the FEC decoding unit 106. The FEC decoding unit 106 decodes the FEC applied to the frame supplied from the frame dividing unit 105 and supplies the decoded FEC to the message decoding unit 107. The message decoding unit 107 extracts control data and content from the frame supplied from the FEC decoding unit 106.
ARIB STD-T61 1.0 Edition 3rd Volume

  When the above method of determining the timing for receiving broadcast information for each mobile station is used, the timing at which the broadcast information is transmitted is uncertain because the base station is not bound by the above specifications. Sometimes it had to be continuously received to wait for broadcast information. For this reason, the power consumption required for the receiving operation cannot be avoided, and the power saving of the operation of the mobile station has been hindered.

  The present invention has been made in view of such problems, and in telecommunications performed between a plurality of devices, the reception side performs reception operation while ensuring an opportunity for the information reception side to receive necessary information. It is an object of the present invention to provide a data receiving apparatus, a data reception control method, and a program that can be performed intermittently.

In order to achieve this object, a data receiving apparatus according to the first aspect of the present invention provides:
A receiving means for sequentially receiving serial data forming a frame while driving power is supplied from the outside;
First discriminating means for discriminating whether or not the plurality of frames received by the receiving unit a plurality of times consecutively are frames of a predetermined time length having common contents;
Frame storage means for storing one of the plurality of frames determined to be frames of a predetermined time length having contents common to each other;
Second determination for determining whether or not serial data further received by the receiving means in a state where the frame storing means stores a frame matches a predetermined feature portion constituting a frame stored by the frame storing means Means,
Continuous reception mode in which the receiving means continuously receives serial data corresponding to the entire frame by supplying power to the receiving means for driving and shutting off the supply, and the receiving means A power control means for realizing an intermittent reception mode for receiving only serial data corresponding to a predetermined portion of a frame, and a data receiving device comprising:
The power control means includes
When the frame storage means does not store a frame, the continuous reception mode is realized by continuously supplying driving power to the reception means,
When the second determining means determines that the serial data further received by the receiving means in a state where the frame storing means stores a frame matches the characteristic portion of the frame stored by the frame storing means, The intermittent reception mode is realized by cutting off the supply of power for driving to the receiving means until reaching the timing at which the supply of one frame having a predetermined time length having the characteristic portion ends.
When the second determining means determines that the serial data further received by the receiving means in a state where the frame storing means stores a frame does not match the feature portion of the frame stored by the frame storing means, Realizing the continuous reception mode by moving to a state in which the driving power is continuously supplied to the receiving means;
It is characterized by that.

The data receiving apparatus is a third discriminating unit for discriminating whether or not a predetermined bit of serial data further received by the receiving unit has a predetermined value in a state where the frame storage unit stores the characteristic portion. May be provided.
In this case, the power control means determines that the third determination means determines that the predetermined bit of the serial data further received by the receiving means does not have a predetermined value while the frame storage means stores the frame. When the determination is made, the continuous reception mode may be realized by moving to a state where the drive power is continuously supplied to the reception means.

  The power control unit performs a process of shifting to a state in which driving power is continuously supplied to the reception unit regardless of a determination result of the second determination unit, by performing a predetermined cycle. The continuous reception mode may be realized at the predetermined cycle.

The data receiving device is:
Range data storage means for storing rewritable range data specifying the range of the characteristic part;
Of the serial data further received by the receiving means in a state where the frame storage means stores the characteristic portion, the contents of the range designated by the range data currently stored by the range data storage means are predetermined reception-required data. When it is determined whether or not they match and when it is determined that they match, the range data is rewritten and the range specified by the range data is expanded, so that the contents of the range specified by the range data in the serial data are Range rewriting means for preventing the data from being indispensable to be received may be further provided.
In this case, the second discriminating means designates the range data currently stored in the range data storage means among the serial data further received by the receiving means in a state where the frame storage means stores the characteristic portion. It may be determined whether or not the content of the range matches the content of the range specified by the range data among the frames stored by the frame storage means.

The receiving means may include means for receiving the serial data by receiving and demodulating a modulated wave representing the serial data.
In this case, the data receiving apparatus may further include an electric field strength measuring unit that measures the electric field strength of the modulated wave and generates a signal indicating the result of the measurement,
The power control means acquires the signal generated by the electric field strength measuring means, determines whether or not the electric field strength indicated by the signal has reached a predetermined value, The continuous reception mode may be realized by shifting to a state in which the power for driving is continuously supplied.

A data reception control method according to the second aspect of the present invention is:
A receiving step in which the receiving means sequentially receives serial data forming a frame while driving power is supplied from the outside;
A first determination step for determining whether or not the plurality of frames received over a plurality of consecutive times in the reception step are frames of a predetermined time length having common contents;
A frame storage step of storing one of the plurality of frames determined to be a frame of a predetermined time length having a common content with each other;
A second discriminating unit for discriminating whether or not the serial data further received in a state in which the frame is stored in the frame storing step matches a predetermined feature portion constituting the stored frame; Determining step,
A continuous reception mode in which the power supply means continuously receives serial data corresponding to the entire frame by supplying power for driving to the reception means and cutting off the supply; And a data reception control method comprising: a power control step for realizing an intermittent reception mode in which the receiving means receives only serial data corresponding to a predetermined part of a frame; and
The power supply means
When the frame is not stored, the continuous reception mode is realized by continuously supplying the driving power to the reception means,
When it is determined that the serial data further received in the state where the frame is stored matches the feature portion of the stored frame, the driving power is supplied to the receiving means. The intermittent reception mode is realized by shutting off until reaching the timing when the supply of one frame having a predetermined time length is completed,
When it is determined that the serial data further received with the frame stored does not match the characteristic portion of the stored frame, the driving power is continuously supplied to the receiving means. Realizing the continuous reception mode by moving to a state;
It is characterized by that.

A program according to the third aspect of the present invention is:
Computer
A receiving means for sequentially receiving serial data forming a frame while driving power is supplied from the outside;
First discriminating means for discriminating whether or not the plurality of frames received by the receiving unit a plurality of times consecutively are frames of a predetermined time length having common contents;
Frame storage means for storing one of the plurality of frames determined to be frames of a predetermined time length having contents common to each other;
Second determination for determining whether or not serial data further received by the receiving means in a state where the frame storing means stores a frame matches a predetermined feature portion constituting a frame stored by the frame storing means Means,
Continuous reception mode in which the receiving means continuously receives serial data corresponding to the entire frame by supplying power to the receiving means for driving and shutting off the supply, and the receiving means Is a program for functioning as a data receiving device comprising a power control means for realizing an intermittent reception mode for receiving only serial data corresponding to a predetermined portion of a frame,
The power control means includes
When the frame storage means does not store a frame, the continuous reception mode is realized by continuously supplying driving power to the reception means,
When the second determining means determines that the serial data further received by the receiving means in a state where the frame storing means stores a frame matches the characteristic portion of the frame stored by the frame storing means, The intermittent reception mode is realized by cutting off the supply of power for driving to the receiving means until reaching the timing at which the supply of one frame having a predetermined time length having the characteristic portion ends.
When the second determining means determines that the serial data further received by the receiving means in a state where the frame storing means stores a frame does not match the feature portion of the frame stored by the frame storing means, Realizing the continuous reception mode by moving to a state in which the driving power is continuously supplied to the receiving means;
It is characterized by that.

  According to the present invention, in telecommunications performed between a plurality of devices, the reception side of information can ensure reception of necessary information and the reception side can perform reception operation intermittently. A data receiver, a data reception control method, and a program are realized.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows the configuration of the data receiving apparatus according to the embodiment of the present invention. As shown in the figure, this data receiving apparatus includes a system control unit 1, an RF (Radio Frequency) power supply control unit 2, an RF unit 3, a digital conversion unit 4, a frame division unit 5, and an FEC (Forward Error Correction). : Forward error correction) The decoding unit 6 and the message decoding unit 7 are configured.

  The system control unit 1 includes, for example, a processor such as a CPU (Central Processing Unit), a memory, a control circuit for controlling each unit of the data receiving device, and a power supply circuit that supplies power to each unit of the data receiving device. In accordance with a program or the like stored in advance by itself, power is supplied to each part of the data receiving apparatus including the RF power supply control unit 2, and other predetermined control is applied.

  The RF power supply control unit 2 includes a current path from the power supply circuit of the system control unit 1 to the RF unit 3 and a control circuit that connects and disconnects the current path. The FEC decoding unit 6 and the message decoding unit The current path is connected or cut off in accordance with an instruction supplied as a result of the processing described later performed by 7.

  The RF unit 3 includes an antenna, a tuning circuit, a high-frequency amplifier circuit, and a detection circuit that detects a frequency modulation wave, and a modulation wave that represents a continuation of data forming a frame, for example, an FSK (Frequency Shift Keying) modulation wave. Is received, amplified, and detected to generate a baseband signal. Then, this baseband signal is supplied to the digital converter 4.

The digital conversion unit 4, the frame division unit 5, the FEC decoding unit 6 and the message decoding unit 7 all store data such as a processor, a program to be executed by the processor, and provide a work area for the processor. , And so on. Further, the FEC decoding unit 6 further includes, for example, an oscillator and a counter circuit, and continuously transmits elapsed time data indicating an elapsed time from an arbitrary time point in parallel with other processing executed by the FEC decoding unit 6. Generate.
A single processor may perform a part or all of the functions of the digital conversion unit 4, the frame division unit 5, the FEC decoding unit 6, and the message decoding unit 7.

  The digital conversion unit 4 determines the value of the dibit represented by each symbol period of the baseband signal supplied from the RF unit 3, and based on the determination result, the digital conversion unit 4 continues the frames represented by the FSK modulated wave received by the RF unit 3. Play the corresponding data. Then, the reproduced data is supplied to the frame dividing unit 5.

  The frame division unit 5 divides the data supplied from the digital conversion unit 4 into portions corresponding to individual frames, and supplies the obtained frames to the FEC decoding unit 6.

When the frame is supplied from the frame dividing unit 5, the FEC decoding unit 6 performs error correction of the frame by decoding the FEC if the frame is subjected to FEC. In addition, when rearrangement (interleaving or the like) of bits constituting the frame is performed, the arrangement order of bits in the frame is also restored. Then, the frame that has undergone error correction and restoration of the arrangement order is supplied to the message decoding unit 7.
On the other hand, the FEC decoding unit 6 controls the RF power supply control unit 2 by performing processing to be described later. And the reception essential message which is the data used in the said process is memorize | stored beforehand.

When the message decoding unit 7 is supplied with a frame that has been subjected to error correction or restoration of the arrangement order from the FEC decoding unit 6, from this frame, control data, content, or any other data transmitted using this frame is transmitted. Extract data. Then, the extracted content is output by an arbitrary method, or predetermined processing is performed in response to the extracted control data. When outputting content, the message decoding unit 7 may include an output device such as a liquid crystal display, a D / A (Digital-to-Analog) converter, and a speaker, or a USB (Universal Serial). Bus) or the like may be provided.
On the other hand, the message decoding unit 7 also controls the RF power supply control unit 2 by performing processing described later.

  Next, the data structure of a frame received by the data receiving apparatus will be described by taking as an example a case where the frame conforms to APCO Project 25.

  FIG. 2 is a diagram showing a data structure of a frame received by the data receiving apparatus. That is, as shown in FIG. 2 (a), (b) or (c), this frame has one FS (frame synchronization word), one NID (Network Identifier), one to three, in order from the top. TSBK (Trunking Signaling Block), SS (Status Symbol), and null data are included.

  A frame including one TSBK, that is, a frame as shown in FIG. 2A is called a single TSBK OBP (Outbound Signaling Packet), and a frame including two TSBKs, that is, a frame as shown in FIG. Is referred to as Double TSBK OBP, and a frame including three TSBKs, that is, a frame as shown in FIG. 2C is referred to as Triple TSBK OBP. Single TSBK OBP is transmitted at 37.5 milliseconds, Double TSBK OBP is transmitted at 60 milliseconds, and Triple TSBK OBP is transmitted at 75 milliseconds.

  One TSBK has, for example, a data structure shown in FIG. 3 in a state before being subjected to trellis coding and interleaving processing described later. That is, one TSBK, in order from the top, is 1-bit LB (Last Block), 1-bit P, 6-bit Opcode, 8-bit (ie, 1 octet) manufacturer ID (Manufacturer's ID), arbitrary content 8 octets of Arguments, and 2 octets of TSBK CRC (Circular Redundancy Code). Note that the Opcode and the message may be encrypted.

  LB is data indicating whether or not the TSBK including the LB is the last TSBK in the frame. P is data indicating whether or not the subsequent Opcode and message are encrypted. Opcode is data indicating the type of subsequent message. The manufacturer ID is data for identifying the producer of the message. The TSBK CRC is a CRC of the entire data excluding the TSBK CRC itself from the TSBK including the TSBK CRC.

  FIG. 4 shows a TSBK format in which the message conforms to the format “Network_Status_Broadcast” (the format in which the status of the communication network that transmits this message is simultaneously transmitted to all receiving devices by the base station in the communication network). FIG. 5 is a diagram showing a data structure, and FIG. 5 shows a message of the format “Group Voice Channel Grant” (a data receiving device belonging to a specific group when a plurality of data receiving devices receiving this message are divided into a plurality of groups. FIG. 2 is a diagram showing a data structure of TSBK conforming to a format for permitting transmission of voice to

As shown in the figure, in the TSBK of FIG. 4, the message is a 1-octet reserved area (the portion marked “Reserved” in FIG. 4), 3 octets of data “System Services Available”, 3 octets from the beginning. Data “System Services Supported” and 1-octet data “Request Priority Level”.
On the other hand, in the TSBK of FIG. 5, the message is, in order from the beginning, 1 octet data “Service Options”, 2 octet data “Channel”, 2 octet data “Group Address”, and 2 octet data “Source Address”. Is included.

The TSBK described above is subjected to trellis coding and interleaving processing before being incorporated into a frame.
That is, for example, a TSBK having the data structure shown in FIG. 3, FIG. 4 or FIG. 5 is first subjected to trellis encoding by 2 bits from the beginning as shown in FIG. (In FIG. 6, each 2-bit part numbered from 0 to 47, that is, a dibit, is subjected to trellis coding in 48 times in the order of the number.)
As shown in FIG. 7, a 2-bit termination code is added to the end of the TSBK that has been subjected to trellis encoding (2 bits numbered “96” and “97” in FIG. 7. (The numbers from 0 to 97 attached to each bit in FIG. 7 indicate the order from the beginning of each bit in the TSBK subjected to trellis coding.)
The TSBK with the termination code is interleaved as shown in FIG. That is, the same numbered bits in FIG. 7 and FIG. 8 are the same bits. Therefore, as shown in FIG. 8, each bit is 0th, 1st, 26th, 27th in order from the top. , 50th,..., 73th, 96th, 97th, 24th, 25th.

Next, processing in which the FEC decoding unit 6 and the message decoding unit 7 control the RF power supply control unit 2 will be described with reference to FIGS. 9 and 10.
First, in the initial state, the FEC decoding unit 6 and the message decoding unit 7 decide to supply power to the RF unit 3 continuously, and instruct the RF power supply control unit 2 to supply power to the RF unit 3. . As a result, the RF power supply control unit 2 supplies power from the system control unit 1 to the RF unit 3 and the RF unit 3 is driven. Therefore, the data receiving apparatus continuously performs an operation of receiving data. That is, the continuous reception mode is entered (FIG. 9, step S1). In step S1, the FEC decoding unit 6 erases the storage of the frame if there is a frame temporarily stored in step S6 described later.

  Next, the FEC decoding unit 6 determines whether or not the frame supplied from the frame dividing unit 5 is a frame according to a single block format (that is, Single TSBK OBP) (step S2). If it is determined that the data is not obeyed, the data receiving apparatus maintains the continuous reception mode (step S1). On the other hand, if it is determined that the single block format is followed, the FEC decoding unit 6 corrects the error of the frame and restores the bit arrangement order, and then supplies the frame to the message decoding unit 7. 7 decodes the TSBK of the frame (step S3).

  Then, the message decoding unit 7 determines whether or not the TSBK decoded in step S3 is a notification message (step S4). If it is determined that the message is not a notification message, the data reception device maintains the continuous reception mode. (Step S1).

  Note that the determination as to whether or not the TSBK is a broadcast message is specifically, for example, when the broadcast message conforms to the format “Group Voice Channel Grant”, as shown in FIG. This can be done by verifying the contents of the octet (that is, the first three octets) and the fifth and sixth octets from the beginning (except for the first two bits of the fifth octet).

On the other hand, if it is determined that the message is a notification message, the message decoding unit 7 determines whether or not the notification message has been continuously received for a predetermined number of consecutive times including this time (step S5). Specifically, for example, the message decoding unit 7 stores data of the number of times that the notification message has been continuously received, and increments the data by 1 when determining that the notification message has been received in step S4. On the other hand, when it is determined that the notification message has not been received, the data is reset to 0. In step S5, whether the data has reached a predetermined value after the data is incremented. May be discriminated.
If it is determined in step S5 that the notification message has not been received for a predetermined number of times or more, the data receiving apparatus maintains the continuous reception mode (step S1).

  On the other hand, when the message decoding unit 7 determines that the notification message has been received for a predetermined number of times or more in step S5, the FEC decoding unit 6 has determined that the notification message has been received for a predetermined number of times or more. In response to the above, the frame including the notification message is temporarily stored in a state before error correction or bit order is restored (step S6), and the intermittent reception mode is entered (FIGS. 9, 10, and S10). ).

When the intermittent reception mode is entered, first, the FEC decoding unit 6 secures a storage area for storing a variable Cn used in step S15 described later, and stores a predetermined initial value in this storage area. Note that this initial value is smaller than the data length of TSBK.
Then, the FEC decoding unit 6 starts an operation of continuously generating intermittent reception mode duration data indicating an elapsed time from the latest time point when the continuous reception mode is changed to the intermittent reception mode, and in parallel with this, Step S11 and subsequent steps are performed.

In step S11, the data receiving apparatus determines whether or not the electric field strength of the FSK modulated wave to be received has reached a predetermined value (FIG. 10). Specifically, in the processing of step S11, for example, the RF unit 3 includes an electronic circuit that measures the intensity of the FSK modulated wave induced in its own antenna. According to the instruction of the decoding unit 6 or the message decoding unit 7, the intensity of the FSK modulated wave induced in its own antenna is measured, and a signal representing the measurement result is supplied to the FEC decoding unit 6 or the message decoding unit 7. This can be done according to the procedure.
If it is determined in step S11 that the electric field strength has not reached the predetermined value, the data receiving apparatus returns to the continuous reception mode (step S1 in FIG. 9). If it is determined that the electric field strength has been reached, the process proceeds to step S12.

  In step S12, the FEC decoding unit 6 determines whether or not the current value of the intermittent reception mode duration data generated by itself indicates that a predetermined expiration period has elapsed since the time when the intermittent reception mode was entered. If it is determined that the time has elapsed, the data receiving apparatus returns to the continuous reception mode (FIG. 9, step S1). If it is determined that the time has not elapsed, the process proceeds to step S13.

  In step S13, the FEC decoding unit 6 newly acquires a predetermined number of bit groups from the top of the TSBK, specifically, a number of bits equal to the value of the variable Cn, from the frame dividing unit 5. Then, it is determined whether or not the value of the bit corresponding to LB in these bit groups matches the value expected as the value that should be taken (step S14). Specifically, for example, when it is determined that the TSBK including the bit group newly acquired in step S13 is the last TSBK in the frame with reference to the contents of data constituting the already acquired frame, etc. , It is determined whether or not the value of the bit corresponding to LB matches “0”. On the other hand, if it is determined that the bit is not the last TSBK, whether or not the value of the bit matches “1”. Can be determined.

  If it is determined in step S14 that the value does not match the expected value, the data receiving apparatus returns to the continuous reception mode (FIG. 9, step S1). If it is determined that the values match, the process proceeds to step S15.

  In step S15, the bit group newly acquired in step S13 by the FEC decoding unit 6 matches the value of the bit corresponding to each bit belonging to the bit group in the TSBK included in the frame temporarily stored in step S6. It is determined whether or not. (Specifically, for example, among the bits in the bit group newly extracted in step S13, the value of the bit to be discriminated at the position subsequent to the bit to be discriminated last in step S15, and temporary in step S6 It is determined whether or not the value of the bit at the position corresponding to the bit to be determined matches in the TSBK included in the stored frame). If it is determined that they do not match, the data receiving device returns to the continuous reception mode (step S1 in FIG. 9). If it is determined that they match, the process proceeds to step S16.

  In step S16, the FEC decoding unit 6 determines the total number of times of determination in step S15 for the bit group acquired most recently in step S13 (that is, the total number of bits determined in the TSBK) as the above variable. It is determined whether or not the value of Cn has been reached. If it is determined that it has not been reached, the FEC decoding unit 6 returns the process to step S15, and if it is determined that it has been reached, the process proceeds to step S17.

  In step S <b> 17, the FEC decoding unit 6 determines whether or not the bit group newly acquired in step S <b> 13 matches the data stored by itself as a reception-required message. If it is determined that they match, the variable Cn is incremented by 1 (step S18), and the process returns to step S15.

  On the other hand, if it is determined in step S17 that the message does not match the reception-required message, the FEC decoding unit 6 determines to cut off the supply of power to the RF unit 3, and sends the RF power supply control unit 2 to the RF unit 3. Instructing the power to be cut off. As a result, the RF power supply control unit 2 cuts off the supply of power from the system control unit 1 to the RF unit 3 and stops the driving of the RF unit 3, so that the data receiving apparatus stops the operation of receiving data.

  After the data receiving apparatus stops the operation of receiving data, the FEC decoding unit 6 starts the operation of continuously generating the standby time data indicating the elapsed time from the time when the stop started, and this standby time It waits for the current value of the data to reach a value corresponding to the timing at which transmission of the next frame is started. When the value corresponding to the timing is reached, the FEC decoding unit 6 stops generating the waiting time data on the assumption that the waiting period has expired, and the data receiving apparatus returns the process to step S11. As a result, the intermittent reception mode is maintained.

  Note that, for example, if the FEC decoding unit 6 is known to transmit the above-described notification message using a frame having a predetermined time length (for example, always transmitted using Single TSBK OBP), the FEC decoding unit 6 The timing at which the transmission of the next frame is started may be specified based on the predetermined time length.

By performing the operation described above, the data receiving apparatus receives data while changing between the continuous reception mode and the intermittent reception mode.
As a result, this data receiving apparatus is provided with certain features of the notification message when data determined to be the notification message is obtained continuously from a certain number of consecutive frames in the continuous reception mode. The intermittent reception mode in which the reception operation is performed only during the period during which the portion is transmitted is entered. Then, the intermittent reception mode is continued while this part that is sequentially received in the intermittent reception mode has the characteristic, and when the part having contents different from the characteristic is received, the continuous reception mode is restored. .

However, when the electric field intensity of the modulated wave representing the packet is not sufficient and there is a high possibility that the data constituting the frame is erroneously restored, the continuous reception mode is restored.
In addition, even when a certain amount of time has elapsed after entering the intermittent reception mode, since the return to the continuous reception mode is performed, for example, even when the feature itself of the notification message changes, the feature is expressed. As a result of periodically updating the data, intermittent reception is performed correctly.

  In addition, the number of bits of the data representing the above-mentioned characteristics, which are subject to verification in the intermittent reception mode, is extended to a number of bits that can be distinguished without matching with the characteristics of a predetermined reception-required message. The On the other hand, as a result of this extension, the part corresponding to the reception-required message in the frame is always received.

Note that the configuration of the data receiving apparatus is not limited to that described above.
For example, a portion configured by a processor in each unit of the data receiving apparatus may be configured by a dedicated electronic circuit instead of the processor. Further, the RF unit 3 may receive a modulated wave via a wired line.

  Further, the data structure of the frame to be received is not necessarily limited to the above-described one, and the encoding and rearrangement modes of the bits constituting the frame are not limited to the above-described one. In addition, the frame to be received does not necessarily have to be encoded or bit rearranged. In addition, the part to be verified in the intermittent reception mode does not necessarily need to be the head part of TSBK.

Although the embodiments of the present invention have been described above, the data receiving apparatus according to the present invention can be realized using a normal computer system, not a dedicated system.
For example, installing the program from a recording medium (CD-ROM, flexible disk, etc.) storing a program for causing a computer equipped with a power supply circuit, an antenna, a high-frequency amplifier circuit, etc. to execute the operation of the data receiving device described above Thus, a data receiving apparatus that executes the above-described processing can be configured.

Further, for example, the program may be uploaded to the BBS of the communication line, and these may be distributed via the communication line. Also, the carrier wave is modulated by a signal representing the program, and the obtained modulated wave is transmitted. A device that receives the modulated wave may demodulate the modulated wave to restore the program.
The above-described processing can be executed by starting this program and executing it under the control of the OS in the same manner as other application programs.

  When the OS shares a part of the processing, or when the OS constitutes a part of one component of the present invention, a program excluding the part is stored in the recording medium. May be. Also in this case, in the present invention, it is assumed that the recording medium stores a program for executing each function or step executed by the computer.

It is a figure which shows the structure of the data receiver which concerns on embodiment of this invention. (A), (b), and (c) are figures which show the data structure of a frame, respectively. It is a figure which shows the data structure of TSBK. It is a figure which shows the data structure of TSBK according to format "Network_Status_Broadcast". It is a figure which shows the data structure of TSBK according to format "Group Voice Channel Grant". It is a figure which shows the order which the dibit in TSBK receives a trellis encoding. It is a figure which shows the state by which the termination code was attached | subjected to TSBK. It is a figure which shows the state by which TSBK was interleaved. It is a flowchart which shows the flow of a process in which an FEC decoding part and a message decoding part control RF power supply control part. It is a continuation of the flowchart which shows the flow of the process in which an FEC decoding part and a message decoding part control RF power supply control part. It is a figure which shows the bit used as verification object among TSBK according to format "Group Voice Channel Grant". It is a figure which shows the structure of the data receiver which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 System control part 2 RF power supply control part 3 RF part 4 Digital conversion part 5 Frame division part 6 FEC decoding part 7 Message decoding part

Claims (7)

A receiving means for sequentially receiving serial data forming a frame while driving power is supplied from the outside;
First discriminating means for discriminating whether or not the plurality of frames received by the receiving unit a plurality of times consecutively are frames of a predetermined time length having common contents;
Frame storage means for storing one of the plurality of frames determined to be frames of a predetermined time length having contents common to each other;
Second determination for determining whether or not serial data further received by the receiving means in a state where the frame storing means stores a frame matches a predetermined feature portion constituting a frame stored by the frame storing means Means,
Continuous reception mode in which the receiving means continuously receives serial data corresponding to the entire frame by supplying power to the receiving means for driving and shutting off the supply, and the receiving means A power control means for realizing an intermittent reception mode for receiving only serial data corresponding to a predetermined portion of a frame, and a data receiving device comprising:
The power control means includes
When the frame storage means does not store a frame, the continuous reception mode is realized by continuously supplying driving power to the reception means,
When the second determining means determines that the serial data further received by the receiving means in a state where the frame storing means stores a frame matches the characteristic portion of the frame stored by the frame storing means, The intermittent reception mode is realized by cutting off the supply of power for driving to the receiving means until reaching the timing at which the supply of one frame having a predetermined time length having the characteristic portion ends.
When the second determining means determines that the serial data further received by the receiving means in a state where the frame storing means stores a frame does not match the feature portion of the frame stored by the frame storing means, Realizing the continuous reception mode by moving to a state in which the driving power is continuously supplied to the receiving means;
A data receiving apparatus. Third discriminating means for discriminating whether or not a predetermined bit of serial data further received by the receiving means in a state where the frame storage means stores a characteristic portion has a predetermined value,
When the third determining unit determines that the predetermined bit of the serial data further received by the receiving unit does not have a predetermined value while the frame storing unit stores the frame, The continuous reception mode is realized by moving to a state where the drive power is continuously supplied to the reception means.
The data receiving device according to claim 1. The power control unit performs a process of shifting to a state in which driving power is continuously supplied to the reception unit regardless of a determination result of the second determination unit, by performing a predetermined cycle. Realizing the continuous reception mode in the predetermined cycle,
The data receiving apparatus according to claim 1, wherein the data receiving apparatus is a data receiving apparatus. Range data storage means for storing rewritable range data specifying the range of the characteristic part;
Of the serial data further received by the receiving means in a state where the frame storage means stores the characteristic portion, the contents of the range designated by the range data currently stored by the range data storage means are predetermined reception-required data. When it is determined whether or not they match and when it is determined that they match, the range data is rewritten and the range specified by the range data is expanded, so that the contents of the range specified by the range data in the serial data are And a range rewriting means for preventing the data from being required to be received.
The second discriminating means includes the contents of the range designated by the range data currently stored in the range data storage means among the serial data further received by the receiving means in a state where the frame storage means stores the characteristic portion. Is to determine whether or not the frame data stored in the frame storage means matches the contents of the range specified by the range data.
The data receiving apparatus according to claim 1, 2, or 3. The receiving means includes means for receiving the serial data by receiving and demodulating a modulated wave representing the serial data,
Electric field strength measuring means for measuring the electric field strength of the modulated wave and generating a signal indicating the result of the measurement;
The power control means acquires the signal generated by the electric field strength measuring means, determines whether or not the electric field strength indicated by the signal has reached a predetermined value, The continuous reception mode is realized by shifting to a state in which power for driving is continuously supplied.
The data receiving device according to claim 1, wherein the data receiving device is a data receiving device. A receiving step in which the receiving means sequentially receives serial data forming a frame while driving power is supplied from the outside;
A first determination step for determining whether or not the plurality of frames received over a plurality of consecutive times in the reception step are frames of a predetermined time length having common contents;
A frame storage step of storing one of the plurality of frames determined to be a frame of a predetermined time length having a common content with each other;
A second discriminating unit for discriminating whether or not the serial data further received in a state in which the frame is stored in the frame storing step matches a predetermined feature portion constituting the stored frame; Determining step,
A continuous reception mode in which the power supply means continuously receives serial data corresponding to the entire frame by supplying power for driving to the reception means and cutting off the supply; And a data reception control method comprising: a power control step for realizing an intermittent reception mode in which the receiving means receives only serial data corresponding to a predetermined part of a frame; and
The power supply means
When the frame is not stored, the continuous reception mode is realized by continuously supplying the driving power to the reception means,
When it is determined that the serial data further received in the state where the frame is stored matches the feature portion of the stored frame, the driving power is supplied to the receiving means. The intermittent reception mode is realized by shutting off until reaching the timing when the supply of one frame having a predetermined time length is completed,
When it is determined that the serial data further received with the frame stored does not match the characteristic portion of the stored frame, the driving power is continuously supplied to the receiving means. Realizing the continuous reception mode by moving to a state;
And a data reception control method. Computer
A receiving means for sequentially receiving serial data forming a frame while driving power is supplied from the outside;
First discriminating means for discriminating whether or not the plurality of frames received by the receiving unit a plurality of times consecutively are frames of a predetermined time length having common contents;
Frame storage means for storing one of the plurality of frames determined to be frames of a predetermined time length having contents common to each other;
Second determination for determining whether or not serial data further received by the receiving means in a state where the frame storing means stores a frame matches a predetermined feature portion constituting a frame stored by the frame storing means Means,
Continuous reception mode in which the receiving means continuously receives serial data corresponding to the entire frame by supplying power to the receiving means for driving and shutting off the supply, and the receiving means Is a program for functioning as a data receiving device comprising a power control means for realizing an intermittent reception mode for receiving only serial data corresponding to a predetermined portion of a frame,
The power control means includes
When the frame storage means does not store a frame, the continuous reception mode is realized by continuously supplying driving power to the reception means,
When the second determining means determines that the serial data further received by the receiving means in a state where the frame storing means stores a frame matches the characteristic portion of the frame stored by the frame storing means, The intermittent reception mode is realized by cutting off the supply of power for driving to the receiving means until reaching the timing at which the supply of one frame having a predetermined time length having the characteristic portion ends.
When the second determining means determines that the serial data further received by the receiving means in a state where the frame storing means stores a frame does not match the feature portion of the frame stored by the frame storing means, Realizing the continuous reception mode by moving to a state in which the driving power is continuously supplied to the receiving means;
A program characterized by that.

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