JP2000004277A - Radio communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the power consumption of a transmitter by making the transmission power of an insignificant part low, attaching the beginning of a word information which displays the existence of a significant part to just before the beginning of the significant part, attaching the end of a work information to just after the end of the significant part and judging the category of each information according to a header added to the information. SOLUTION: The transmission power of an insignificant part is made lower than the transmission power of a significant part in the case of transmitting a signal in which the significant part and the insignificant part are mixed from the viewpoint of a time base. The beginning of a word information that displays the existence of the significant part is attached just before the beginning of the significant part, the end of a word information is attached just after the end of the significant part and the category of each information is judged according to a header to which the information is attached. For instance, a transmitting part is provided with a sound detecting part 2, a header attaching part 7, a power controlling part 9, a transmission power setting part 10, etc. The part 10 sets the power of the significant part M higher than the power of the insignificant part X and suppresses useless transmission power consumption in the part X.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication method for reducing power consumption of a transceiver in mobile station communication, especially in radio communication such as a portable telephone.

[0002]

2. Description of the Related Art Mobile phones tend to be increasingly used as easy communication means. In order for a large number of mobile stations such as a mobile phone to communicate with each other with weak radio waves, a large number of radio stations called base stations are arranged at an appropriate distance in advance. An area having a constant radius centered on each base station is called a cell, and mobile stations in the cell perform radio communication with a base station at the center of the cell. The base stations are interconnected by a communication line such as an ATM (Asynchronous Transfer Mode) line. This communication line enables a call between a mobile station in a cell of a certain base station and a mobile station in a cell of another base station.

[0003]

However, the above-mentioned prior art has the following problems to be solved.
The mobile station transmits radio waves of a predetermined format to the base station, and receives radio waves of the predetermined format from the base station to perform wireless communication. In order to reduce the size and power consumption of each mobile station, it is necessary to sufficiently reduce the power for transmission and reception. However, according to the conventional communication system, the format of the transmission / reception signal is fixed beforehand, and the transmitting side is obliged to transmit the signal at a level equal to or higher than a predetermined level for a predetermined time. The receiving side must receive the signal for a certain period of time and perform a predetermined decoding process. For this reason, even in the silent state, the transceiver continues to operate, causing a waste of power.

[0004]

The present invention employs the following structure to solve the above problems. <Configuration 1> When a signal in which a significant portion and an insignificant portion coexist from the time axis is transmitted by radio, the transmission power of the insignificant portion is made lower than the transmission power of the significant portion, and at least the significant portion is transmitted. A radio head characterized by adding prefix information indicating the presence of a significant part immediately before the start, adding ending information immediately after the end of the significant part, and judging the type of each of the above information based on the header added to the information. Communication method.

<Structure 2> In the method described in Structure 1,
A wireless communication method characterized by lowering the transmission power of information added to a significant part of transmission power.

<Structure 3> In the method described in Structure 1,
A wireless communication method, characterized by adding a header with two or more spreading gains to the prefix information.

<Structure 4> In the method described in Structure 1,
A wireless communication method characterized by lowering the transmission power of ending information relative to the transmission power of prefix information.

<Structure 5> When a signal in which a significant part and an insignificant part are mixed in the time axis is transmitted and received by radio,
On the transmitting side, the transmission power of the insignificant part is made lower than the transmission power of the significant part, and at least the beginning information indicating the presence of the significant part is added immediately before the start of the significant part. A wireless communication method comprising adding information and receiving the prefix information on a receiving side, and then operating a signal processing unit of the receiver.

<Structure 6> When a signal in which a significant part and an insignificant part are mixed from the time axis is transmitted and received by radio,
On the transmitting side, the transmission power of the insignificant part is made lower than the transmission power of the significant part, and at least the beginning information indicating the presence of the significant part is added immediately before the start of the significant part. A wireless communication method comprising adding information and stopping operation of a signal processing unit of a receiver when receiving the ending information on a receiving side.

<Structure 7> When a signal in which a significant part and an insignificant part are mixed in the time axis is transmitted and received by radio,
On the transmitting side, the transmission power of the insignificant part is made lower than the transmission power of the significant part, and at least the beginning information indicating the presence of the significant part is added immediately before the start of the significant part. A wireless communication method comprising adding information and stopping the operation of a signal processing unit of a receiver when the receiving side does not receive the ending information for a predetermined time after receiving the significant part.

<Structure 8> In the method described in Structure 7,
On the receiving side, after receiving the significant part, when the ending information is not received for a certain period of time, when the operation of the signal processing unit of the receiver is stopped, the error rate of the received signal is monitored, and the error rate is equal to or less than the threshold. In the wireless communication method, when the error rate exceeds a threshold, the constant value is lengthened.

<Configuration 9> When a signal in which a significant part and an insignificant part are mixed in the time axis is transmitted and received by radio,
On the transmitting side, the transmission power of the insignificant part is made lower than the transmission power of the significant part, and at least the beginning information indicating the presence of the significant part is added immediately before the start of the significant part. A wireless communication method comprising adding information, adding noise level information indicating a noise level at the time of transmission to an insignificant part, and increasing the transmission power when the noise level information changes frequently.

<Structure 10> When a signal in which a significant part and an insignificant part coexist from the time axis is transmitted and received by radio, the transmission power of the insignificant part is set lower on the transmitting side than the transmission power of the significant part. At the same time, at least immediately before the start of the significant portion, the beginning information indicating the presence of the significant portion is added, and immediately after the end of the significant portion, the ending information is added. A wireless communication method characterized by increasing the transmission power in many cases.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below using specific examples. <Specific Example> FIG. 1 is a block diagram of a transmitter for implementing the communication method of the present invention. The transmitting unit includes an A / D converter 1, a sound detection unit 2, a voice coding unit 3, a blocking unit 4, a convolution coding unit 5, an interleave processing unit 6, a header adding unit 7, a spreading unit 8, Power control unit 9, transmission power setting unit 10, noise level calculation unit 11, transmission determination unit 12,
A counter 13, a convolutional coding unit 14, an interleave processing unit 15, a header adding unit 16 and a spreading unit 17 are provided. On the input side of the power control unit 9, a switching unit 18 for selecting and outputting one of the outputs of the spreading unit 17 and the spreading unit 8 is provided.

The A / D converter 1 is a circuit for converting an analog signal to be transmitted input from a microphone or the like of a mobile station into a digital signal. The sound detection unit 2 is a circuit that detects when a sound to be transmitted from a microphone is input, and outputs the sound to the audio encoding unit 3. The audio encoding unit 3
This is a part for converting an input audio signal into a preset multi-valued digital signal. The blocking unit 4 is a unit that performs processing for transmitting the audio signal in block units. The convolution encoding unit 5, the interleave processing unit 6, the header adding unit 7, and the spreading unit 8 are all well-known functional blocks for performing signal processing specified by the spread spectrum communication method.

On the other hand, when the sound detection unit 2 detects that the sound is not a sound part, the signal input from the microphone is noise around the microphone. This is input to the noise level calculator 11. The noise level calculator 11 is a part that calculates a noise level and generates information to be described later. The output of the noise level calculation unit 11 is used for processing relating to an insignificant part. The output of the noise level calculator 11 is input to the transmission determiner 12 and the counter 13. Counter 13
Is used for control described later.

As for the silent part, similarly to the sound part,
In the convolutional coding unit 14, the interleave processing unit 15, the header adding unit 16 and the spreading unit 17, signal processing specified by the spread spectrum communication method is executed. Then, one of the outputs of the spreading unit 8 and the spreading unit 17 is selected by the switching unit 18 and sent to the power control unit 9, and the time multiplexed signal is wirelessly transmitted via a transmitter (not shown) or the like. The switching unit 18 is a switch for performing the time multiplexing control.

The transmission power setting unit 10 includes a power control unit 9
Is a part for giving a predetermined ratio to the outputs of the diffusion unit 17 and the diffusion unit 8. Specifically, the transmission power setting unit 10 is configured to set the power of the sound portion, ie, the significant portion M, higher than the power of the silent portion, ie, the insignificant portion X, and to suppress unnecessary transmission power consumption in the insignificant portion X. Have been.

FIG. 2 shows a block diagram of a receiving section for implementing the communication method of the present invention. The receiving unit includes a demodulating unit 21 that receives an output of a wireless receiving circuit (not shown), a despreading unit 22 that processes a signal of a sound part, a header detecting unit 23,
It includes a deinterleave processing unit 24, a Viterbi decoding unit 25, a blocking unit 26, an audio decoding unit 27, and a D / A converter 28. Further, it comprises a deinterleave processing unit 33, a Viterbi decoding unit 34, and a noise reproducing unit 35 for processing a signal of a silent part.

The signal of the sound part input to the demodulation unit 21 is
Decoding is performed by circuits such as a despreading unit 22, a header detection unit 23, a deinterleave processing unit 24, a Viterbi decoding unit 25, and a blocking unit 26. Thus, the signal subjected to the spectrum despreading encoding is passed through the audio decoding unit 27 to the D / A
Input to the converter 28. The audio signal is converted into an analog signal by the D / A converter 28, and reaches an ear of a caller via a speaker or the like. These circuit configurations are the same as those of a conventional general mobile phone receiving circuit.

When the present invention is implemented, a significant part and an insignificant part are switched by detecting a header in a signal subjected to despreading. Control is performed so that the significant part is output from the header detection unit 23 to the deinterleave processing unit 24 side, and the insignificant part is output from the header detection unit 23 to the deinterleave processing unit 33 side. The insignificant part with less received power is
Thus, the deinterleave processing unit 33, the Viterbi decoding unit 3
4 and is demodulated and decoded. Then, the noise reproducing unit 35
To a suitable level of noise, and the D / A converter 2
Enter 8 The specific operation of this part will be described later.

Next, the specific contents of the present invention will be described in order. <Method of Embodiment 1> FIG. 3 is an explanatory diagram of the method of Embodiment 1. First, in the present invention, in order to save the transmission power of a mobile station such as a mobile phone, the transmission power of the significant part M and the insignificant part X are differentiated as shown in FIG. The significant part M is a signal when an audio signal is actually input. On the other hand, the insignificant part X is a signal in the case where an interrupted part of the voice is input as a break in the speech. The transmission power P is shown in the vertical direction of the figure. The horizontal direction shown in the figure is a time axis. Therefore, the significant portion M having a large width has higher transmission power than the meaningless portion X having a small width. In this way, the transmission power can be reduced except for the sound portion M to be transmitted clearly, and the transmission power can be omitted.

When viewed from the receiver side, the insignificant part X
By detecting the header of the received signal, the subsequent processing can be switched, so that power consumption can be saved. Such a method is not necessarily applied only to voice data communication such as telephone. All of these methods are effective when transmitting various signals in which a significant part and a meaningless part are mixed in the time axis direction. The voice signal when a person speaks is discontinuous, and there are many cases where only ambient noise is input to a microphone during a call. Such ambient noise need not be transmitted with the same clarity as speech. Therefore, when noise other than voice is input, it is determined by the sound detection unit 2 shown in FIG. 1 and the transmission power is reduced as an insignificant part.

The transmission power setting unit 10 shown in FIG. 1 sends the power control unit 9 the ratio of the transmission power to the output of the spreading unit 8 to the transmission power to the output of the spreading unit 17 as shown in FIG. If set, such transmission control is possible. Further, the transmission power of the insignificant portion may be controlled to be zero.

When such a special signal is received on the receiver side, it is necessary to determine a significant part M and a meaningless part X. For this reason, in the first specific example, the head information H is placed at the beginning of the significant part, and the ending information B is placed at the end of the significant part M.
Is added. This may be simple several-bit code data. In order to determine the type of information such as the prefix information H and the ending information B, a header H1 is added to the prefix information H, for example, as shown in the lower left of FIG. Are combined. Similarly, the significant part may be composed of a header and significant information, and the ending information part may be composed of a header and ending information.

<Effect of Specific Example 1> With the above configuration,
The receiving side reliably recognizes the initial information, and then detects the presence of a significant portion and demodulates the audio signal. On the other hand, when the ending information B is detected, it is possible to determine that an insignificant part has been received, and to perform a signal processing method using another method.
Thereby, the transmission power of the transmitter can be sufficiently saved.

<Embodiment 2> FIG. 4 is an explanatory view of the method of Embodiment 2. In the above specific example 1, the head information and the ending information are added to the beginning and end of the significant part with the same transmission power as the significant part. However, these information does not necessarily require as high a signal quality as the significant part M. What is necessary is just to be able to identify whether it is the initial information or the end information. Therefore, the transmission power can be slightly reduced in this portion as well, and power consumption can be saved. There are several types of setting methods.

First, the head information H and the significant part M have the same transmission power, and the end information B has a slightly lower transmission power than the significant part M. Even if the ending information B cannot be recognized on the receiving side, it can be recognized if reception is continued. This is because if there is a sufficient difference between the signal levels of the significant part M and the insignificant part X, the reception level may be monitored and the control may be switched.

The noise level information C obtained by the noise level calculator 11 shown in FIG. 1 can be added to the insignificant part X at an appropriate timing. In such a case, the noise level information C is not always as important as the significant part for the receiving side. Therefore, the transmission power may be reduced by the lower importance. Of course, the transmission powers of the initial information H and the final information B may both be lower than the significant part M by a predetermined level.

<Effect of Specific Example 2> While maintaining the signal quality of the significant part, the transmission power of information having a slightly lower importance than the significant part can be reduced to further reduce the transmission power.

<Embodiment 3> FIG. 5 shows an explanatory diagram of the prefix information of Embodiment 3. Of the above prefix information, ending information, and noise level information, the prefix information is relatively important information indicating the head of a significant part. This is because, when the receiving side distinguishes between signal processing for the insignificant part and signal processing for the significant part, if the head of the significant part cannot be detected, the significant part cannot be clearly restored. Therefore, in order to reliably detect the head information provided at the head of the significant part, a plurality of headers H3 and H4 are added to the head information part H2 as shown in FIG.

<Effect of Specific Example 3> As described above, if any one of the first header H3 and the second header H4 can be reliably detected, the initial information is not overlooked. Thus, the significant part can be processed without error on the receiving side. Note that the word prefix information may be provided in any number of two or more.

<Fourth Embodiment> FIG. 6 is a flowchart showing the receiving operation of the fourth embodiment. Next, a method for reducing the power consumption of the receiving side will be described. The receiving circuit of the mobile station operates to always receive and decode signals during a call and output the result to a speaker. In this example, unnecessary operation of the circuit is stopped or the capacity is reduced to save power consumption except when the significant portion described above is received. In the receiving unit shown in FIG. 2, the receiving unit is divided into a circuit block on the left side of the header detecting units 23 and 32 in the figure and a circuit block after the right deinterleave processing units 24 and 33. The former is called a receiving function unit, and the latter is called a decoding function unit.

The receiving function unit is a part capable of detecting a received signal and analyzing initial information, ending information, and the like. On the other hand, the decoding function unit is a part that performs error correction decoding, audio decoding, and the like on the received signal. Except when a significant signal is received, there is no need to operate this decoding function unit. Therefore, as shown in this figure, control is performed to operate the decoding function unit only when necessary.

First, in step S1, only the receiving function unit is operated. Here, for the received signal, it is determined in step S2 whether or not word prefix information has been received. When the prefix information is received, the process proceeds to step S3, where the decoding function unit is activated. Thus, the entire reception function operates, the decoded signal is output from the speaker, and communication is started (step S4).

On the other hand, in step S5, reception monitoring of the ending information is performed. When the ending information is not received, the state in which the receiving function unit and the decoding function unit are operated continues as before, and the significant part is received. On the other hand, when the ending information is received, the process proceeds to step S6, and the operation of the decoding function unit is stopped. Then, in step S7, while only the receiving function unit is operated, it waits until the next significant part is received. When the next significant part is received, the process returns to step S1 again.

<Effect of Specific Example 4> During reception, the decoding function unit is started for the first time when the prefix information indicating that the significant part has been received is detected, and when the ending information is received, the operation of the decoding function unit is stopped. At the time of reception, useless power consumption is suppressed, and power saving of the receiving unit is achieved. Note that a configuration may be employed in which only one of the operation of activating the decoding function unit when receiving the prefix information and the operation of stopping the decoding function unit when receiving the ending information is performed.

<Embodiment 5> In this embodiment, a description will be given of the case where the end information is not detected when the operation of the decoding function unit is stopped after receiving the end information as described above. In addition, since the ending information is not always important information, it can be omitted on the transmission side.

FIG. 7 is a flowchart of the receiving operation of the fifth embodiment. First, step S1 is a state in which the reception function unit and the decoding function unit are operated to start communication as shown in FIG. Next, in step S2, the ending information is monitored. When the ending information is received, the example 4 has already been given.
As described above, in step S3, the operation of the decoding function unit is stopped, and in step S4, the operation of only the reception function unit is continued.

On the other hand, if the ending information cannot be received in step S2, the process proceeds to step S5, and it is determined whether the reception of the significant portion has been completed. This can be determined by monitoring the change in the reception level and determining that the significant portion has a higher level than the insignificant portion. If it is determined that the reception of the significant part has been completed, the process proceeds to step S6, and a timer is set. Then, in a step S7, time up is monitored. Then, if a certain time has elapsed, step S3
Then, the operation of the decoding function unit is stopped. If any information is received before the time expires, the process proceeds to a normal reception process. The reason for extending the time until the operation of the decoding function unit is stopped by the timer is to prevent a change in the level of the reception power from being erroneously detected.

<Effect of Specific Example 5> As described above, even when the ending information is not added to the significant part or when the ending information to be added to the end of the significant part cannot be recognized, the significant part is not recognized. When a certain period of time has elapsed after the reception is completed, the operation of the decoding function unit is stopped, so that the power consumption of the receiver can be suppressed.

<Embodiment 6> FIG. 8 is a flowchart showing the receiving operation of the embodiment 6. In the specific example 5, after the reception of the significant part is completed, if the ending information cannot be detected, a timer is set, and if the time is up, the operation of the decoding function unit is stopped. The timer is provided when there is an error in the received signal and the reception of the significant part is mistakenly recognized.
This was to enable the reception of the significant part to be continued.
Therefore, as long as it can reliably detect the end of the reception of the significant part,
It is preferable to stop the operation of the decoding function unit as soon as possible. In this specific example 6, two types of time to be set in the timer are prepared as shown in steps S3 and S4 in FIG. 8 for that purpose. The times T1 and T2 are prepared, and the time T2 is set to be longer.

First, in step S1, the error rate of the received signal is monitored. This process is performed by the reception control unit 30 shown in FIG. Then, in step S2, it is determined whether or not the error rate is equal to or less than a preset threshold. If the error rate is equal to or less than the threshold, reception can be performed relatively accurately with a low false detection rate, so the process proceeds to step S3, and the timer is set at the fixed position for a relatively short time. At this time, the time up in step S7 in FIG. 7 is monitored.

On the other hand, if it is determined in step S2 in FIG. 8 that the error rate is not equal to or smaller than the threshold, the process proceeds to step S4, and the timer is set to time T2. That is, it is determined whether a significant portion is not input again for a longer time.

<Effect of Specific Example 6> The time until the operation of the decoding function unit is stopped is extended or shortened depending on the error rate of the received signal. And power consumption can be suppressed.
In addition, the timer value can be set longer if necessary, thereby preventing malfunction.

<Embodiment 7> FIG. 9 is a flowchart showing the transmission operation of Embodiment 7. Here, an appropriate stage is set for the transmission power of the significant part. If the noise level fluctuates greatly, the loss of the information causes deterioration of sound quality. Therefore, the transmission power level is increased to make it easier to capture on the receiving side. Such control is performed in this specific example.

First, in step S1, information on the noise level is monitored. This is performed by the noise level calculator 11 shown in FIG. This noise level is, for example, incorporated into the noise level information as described above and transmitted. In this case, the counter 13 shown in FIG. 1 monitors that the noise level information transmitted at a constant cycle is switched due to a change in the noise level. Then, in step S2, the number of times of switching is counted. In this way, frequency information such as how many times the noise level information has been switched during a certain period of time is calculated.

Next, in step S3, a threshold value set in advance and its frequency are compared. If the frequency is high, it is determined that the environment around the microphone is changing frequently,
In step S4, the transmission power is increased. On the other hand, if the frequency is equal to or less than the threshold, the process proceeds to step S5, and the transmission power is reduced. The power increase rate and the power decrease rate when the transmission power is increased or decreased may be appropriately set. Also, it is preferable to always keep the level constant at the start of the first transmission, and to increase or decrease the power from that level.

<Effect of Specific Example 7> As described above, when the noise level fluctuates drastically, the number of changes in the noise level information is counted, and when the number of times changes beyond a certain value, the transmission power is increased. In the opposite case, if the transmission power is reduced, it is possible to cope with a change in the noise environment around the microphone and to ensure good sound quality.

<Embodiment 8> FIG. 10 is a flowchart showing the transmission operation of Embodiment 8. In the specific example 7, the transmission power was increased or decreased by monitoring the fluctuation of the noise level. Here, the error rates of the head information and the end information are monitored. Thereby, the transmission power according to the error rate is selected. First, in step S1, the error rate of the head information and the end information is monitored. Then, in step S2, it is determined whether or not the value is equal to or smaller than the threshold value. The threshold is set in advance according to the communication status. If the mobile station is located below the threshold, it is determined that the environment in which the mobile station is located is good, and the process proceeds to step S3 to reduce the transmission power.

On the other hand, if it is determined that the transmission power is not less than the threshold, the process proceeds to step S4, and the transmission power is increased. In this way, the transmission power of a mobile station placed in a bad environment is
Judgment is made based on the error rate of the received head information and end information to increase or decrease, and select an optimal transmission power.

<Effect of Specific Example 8> Since the transmission power is optimized according to the environment where the mobile station is located, unnecessary transmission power is not consumed and power can be saved.

[Brief description of the drawings]

FIG. 1 is a block diagram of a transmission unit for implementing a communication method of the present invention.

FIG. 2 is a block diagram of a receiving unit for implementing the communication method of the present invention.

FIG. 3 is an explanatory diagram of a method of a specific example 1.

FIG. 4 is an explanatory diagram of a method of a specific example 2.

FIG. 5 is an explanatory diagram of word prefix information of a specific example 3.

FIG. 6 is a flowchart of a receiving operation according to the fourth embodiment.

FIG. 7 is a flowchart of a receiving operation according to the fifth embodiment.

FIG. 8 is a flowchart of a receiving operation of Example 6;

FIG. 9 is a flowchart illustrating a transmission operation according to the seventh embodiment.

FIG. 10 is a flowchart illustrating a transmission operation according to a specific example 8;

[Explanation of symbols]

 Reference Signs List 2 voiced detection unit 3 voice encoding unit 8 spreading unit 9 power control unit 10 transmission power setting unit 11 noise level calculation unit 17 spreading unit M significant part X insignificant part

Claims (10)

[Claims] When transmitting a signal in which a significant part and an insignificant part coexist when viewed from the time axis, the transmission power of the insignificant part is made lower than the transmission power of the significant part, and at least the significant part is transmitted. At the end of the significant part, and add the ending information immediately after the end of the significant part. The type of each information is determined by the header added to the information. Wireless communication method. 2. The wireless communication method according to claim 1, wherein the transmission power of the information added to the significant part of the transmission power is reduced. 3. The wireless communication method according to claim 1, wherein a header with an increased spreading gain of two or more is added to the prefix information. 4. The wireless communication method according to claim 1, wherein the transmission power of the ending information is made lower than the transmission power of the initial information. 5. When wirelessly transmitting and receiving a signal in which a significant part and an insignificant part coexist when viewed from the time axis, the transmitting side reduces the transmission power of the insignificant part as compared with the transmission power of the significant part. At least immediately before the start of the significant part, add the prefix information indicating the presence of the significant portion, add the ending information immediately after the end of the significant portion, and on the receiving side, after receiving the prefix information, the signal of the receiver A wireless communication method comprising operating a processing unit. 6. When transmitting and receiving wirelessly a signal in which a significant part and an insignificant part coexist when viewed from the time axis, the transmitting side lowers the transmission power of the insignificant part as compared with the transmission power of the significant part. At least immediately before the start of the significant part, add the prefix information indicating the presence of the significant part, add the ending information immediately after the end of the significant part, and on the receiving side, when the ending information is received, signal processing of the receiver A wireless communication method, wherein the operation of the unit is stopped. 7. When transmitting and receiving a signal in which a significant part and an insignificant part coexist from the time axis by radio, the transmitting side lowers the transmission power of the insignificant part as compared with the transmission power of the significant part. At least, prefix information indicating the presence of a significant portion is added immediately before the start of the significant portion, and ending information is added immediately after the end of the significant portion. After receiving the significant portion, the receiving side receives the ending information for a certain period of time. A wireless communication method, wherein the operation of the signal processing unit of the receiver is stopped when the operation is not performed. 8. The method according to claim 7, wherein, when the receiving side does not receive the ending information for a predetermined time after receiving the significant part, the operation of the signal processing unit of the receiver is stopped. Monitoring the error rate, and when the error rate is equal to or less than a threshold, the fixed value is shortened, and when the error rate exceeds the threshold, the fixed value is lengthened. 9. When wirelessly transmitting and receiving a signal in which a significant part and an insignificant part coexist when viewed from the time axis, the transmitting side reduces the transmission power of the insignificant part as compared with the transmission power of the significant part. , At least immediately before the start of the significant portion, add prefix information indicating the presence of the significant portion, add ending information immediately after the end of the significant portion, and add noise level information indicating the noise level at the time of transmission to the insignificant portion. A wireless communication method comprising: increasing the transmission power when the frequency of changing the noise level information is high. 10. When transmitting and receiving a signal in which a significant part and an insignificant part coexist as viewed from the time axis by radio, the transmitting side lowers the transmission power of the insignificant part as compared with the transmission power of the significant part. At least immediately before the start of the significant part, add the prefix information indicating the presence of the significant portion, add the ending information immediately after the end of the significant portion, and monitor the prefix information and the ending information, if the error rate is high. In the wireless communication method, the transmission power is increased.