JP2007028500A - Radio communication terminal, radio base station apparatus, radio communication system, radio communication method and computer program, and its recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication terminal which flattens the number of times of communication without depending on a distance from a radio base station apparatus. <P>SOLUTION: In the radio communication terminal 10a, a storing portion 20a stores informations of a plurality of combinations comprised of a receiving intensity value of a radio signal and a prescribed value which increases as the receiving intensity value increases. A radio receiving portion 16 receives the radio signal. A measuring portion 12 measures the receiving intensity value of the received radio signal and outputs the measured receiving intensity value. A candidate value recording portion 14a records the prescribed value corresponding to the measured receiving intensity value as the candidate value in the storing portion 20a based on the informations stored in the storing portion 20a. A selecting portion 11 generates a random number value from a numerical value range which regards the candidate value stored in the storing portion 20a as a maximum value and selects one random number value generated. After a waiting time calculated based on the random number value has passed, a radio transmitting portion 17 transmits the radio signal to the radio base station apparatus in the case that a transmission indication is input. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a radio communication terminal, a radio base station apparatus, a radio communication system, a radio communication method, a computer program, and a recording medium for transmitting and receiving radio signals mainly by random access.

  Conventionally, various means have been proposed for avoiding a collision that occurs when a radio signal is transmitted from a plurality of radio communication terminals simultaneously in communication between a radio communication terminal and a radio base station apparatus.

For example, in the IEEE802.11 wireless LAN (Local Area Network) system disclosed in Non-Patent Document 1, the wireless communication channel is switched from a state in which another wireless communication terminal is transmitting (hereinafter, busy state) to DIFS ( A wireless communication terminal that transmits a wireless signal after being in an idle state during a Distributed Inter-Frame Space (EIFS) time or an EIFS (Extended Inter-Frame Space) time is within a predetermined back-off window size range. Generate uniform random numbers. Then, by calculating a standby time (also referred to as a back-off time) based on the random number value and transmitting a radio signal after the standby time has elapsed, a radio signal is simultaneously transmitted from a plurality of radio communication terminals, and a collision occurs. A method of reducing the probability of occurrence is applied.
IEEE Standard Department, “Wireless LAN medium access control (MAC) and physical layer (PHY) specifications” ANSI / IEEE Standard 802.11, Aug. 1999.

  However, in the technique of Non-Patent Document 1 described above, the collision probability can be lowered according to the degree of variation of the generated random numbers. However, when the number of wireless communication terminals increases, random numbers generated by the wireless communication terminals are increased. There is a high probability that the random number values will be the same, and if they are the same value, a collision will occur. When a collision occurs, if the electric field strength of the radio signal received by the radio base station apparatus is the same level, the reception intensity value is the same level, and all radio signals are lost. However, when there is a radio signal having a stronger electric field strength than other radio signals, only the radio signal having the stronger electric field strength is demodulated by the radio base station apparatus and is normally received, and other radio signals are noise and It will be regarded. That is, a radio communication terminal that is close to the radio base station device has a higher electric field strength of a radio signal received by the radio base station device, so that the number of radio communications can be increased, but the distance from the radio base station device is increased. A remote wireless communication terminal has a problem that the number of times of wireless communication can be reduced, and the fairness of the number of communication performed with the wireless base station device cannot be maintained.

  The present invention has been made to solve the above problems, and its object is to maintain fairness of the number of communications performed with a radio base station apparatus without depending on the distance from the radio base station apparatus. A wireless communication terminal, a wireless base station device, a wireless communication system, a wireless communication method, a computer program, and a recording medium thereof.

  In order to solve the above problem, the present invention provides a radio base station apparatus that performs transmission / reception using a radio signal, and a radio communication terminal that performs transmission / reception using a radio signal with the radio base station apparatus according to a transmission instruction input at an arbitrary time. A wireless communication terminal in a wireless communication system comprising: a wireless receiving means for receiving a wireless signal transmitted from the wireless base station apparatus; and a reception strength value of the wireless signal received by the wireless receiving means; Based on information of a plurality of combinations consisting of a measurement means for outputting the measured reception intensity value, and a predetermined value that increases as the reception intensity value and the reception intensity value increase, the measurement means that is output from the measurement means Candidate value recording means for recording the predetermined value corresponding to the received intensity value as a candidate value in the first storage means, and the candidate value stored in the first storage means A selection unit that selects a random number value from a numerical value range that is a maximum value; A wireless communication terminal comprising: a wireless transmission means for transmitting a wireless signal to the apparatus.

  The present invention, in the invention described above, comprises second storage means for storing information of a plurality of combinations consisting of the reception strength value and a predetermined value that increases as the reception strength value increases, and the candidate The value recording means corresponds to the reception intensity value output from the measurement means based on information of a plurality of combinations consisting of the reception intensity value stored in the second storage means and a predetermined value. A predetermined value is recorded as a candidate value in the first storage means.

  According to the present invention, in the above-described invention, the wireless reception unit transmits a wireless signal including a plurality of combinations of information including the reception strength value and a predetermined value that increases as the reception strength value increases. Received from the base station apparatus, the candidate value recording means includes a plurality of combinations comprising a reception intensity value included in the radio signal received by the radio reception means and a predetermined value that increases as the reception intensity value increases On the basis of this information, the predetermined value corresponding to the received intensity value output from the measuring means is recorded as a candidate value in the first storage means.

  According to the present invention, in the above-described invention, a determination unit that determines whether or not a control start instruction is included in a wireless signal received by the wireless reception unit, and a third storage unit that stores a standard candidate value in advance The candidate value recording means includes the predetermined value corresponding to the received intensity value output from the measuring means when the determining means determines that a control start instruction is included in the radio signal. Is stored as a candidate value in the first storage means, and when the determination means determines that the wireless signal does not include a control start instruction, the standard stored in the third storage means The candidate value is recorded in the first storage means.

  The present invention is a radio base station apparatus in a radio communication system comprising: a radio base station apparatus that performs transmission / reception using radio signals; and a radio communication terminal that performs radio signal transmission / reception with the radio base station apparatus; Alternatively, based on the measurement means for measuring the number of terminals of the wireless communication terminal in communication and the number of terminals measured by the measurement means and a preset threshold, the reception intensity value on the wireless communication terminal side is used. Determining means for determining whether or not to transmit a radio signal including a control start instruction for starting control of a radio signal transmission interval of a radio communication terminal, and determining that the determining means transmits the control start instruction In this case, the wireless base station apparatus includes: a wireless transmission unit configured to transmit a wireless signal including the control start instruction to the wireless communication terminal.

  The present invention stores, in the above-described invention, information of a plurality of combinations including a reception strength value of a radio signal received by the wireless communication terminal and a predetermined value that increases as the reception strength value increases. Storage means, wherein the wireless transmission means reads information of a plurality of combinations consisting of the reception intensity value and a predetermined value from the storage means, and transmits a wireless signal including the read information and the control start instruction to the wireless signal It transmits to a communication terminal, It is characterized by the above-mentioned.

  The present invention is a radio base station apparatus in a radio communication system comprising: a radio base station apparatus that performs transmission / reception using a radio signal; and a radio communication terminal that performs transmission / reception using a radio signal with the radio base station apparatus, wherein the radio communication Storage means for storing a plurality of combinations of information consisting of a reception intensity value of a radio signal received at a terminal and a predetermined value that increases as the reception intensity value increases, and the reception intensity value and a predetermined value from the storage means And a wireless transmission means for reading a plurality of combinations of the information and transmitting a wireless signal including the read information to the wireless communication terminal.

  The present invention is a radio communication system comprising a radio base station apparatus that performs transmission / reception using radio signals and a radio communication terminal that performs transmission / reception using radio signals according to a transmission instruction input at an arbitrary time. The radio base station apparatus performs control based on a measuring unit that measures the number of terminals of the wireless communication terminal in a communication standby state or in communication, the number of terminals measured by the measuring unit, and a preset threshold value. A first determination unit that determines whether or not to transmit a radio signal including a start instruction; and when the first determination unit determines to transmit the control start instruction, the radio signal including the control start instruction is Means for transmitting to a wireless communication terminal, wherein the wireless communication terminal includes a plurality of combinations of the reception strength value and a predetermined value that increases as the reception strength value increases. Second storage means for storing information, third storage means for storing standard candidate values in advance, wireless reception means for receiving a radio signal transmitted from the radio base station apparatus, and reception by the radio reception means Measuring a reception strength value of the radio signal received by the radio reception unit, and outputting the measured reception intensity value When the measurement unit and the second determination unit determine that the radio signal includes a control start instruction, the reception unit includes a reception intensity value stored in the second storage unit and a predetermined value. The predetermined value corresponding to the received intensity value output from the measurement unit based on a plurality of combinations of information is recorded as a candidate value in a first storage unit, and the second determination unit is configured to transmit the radio signal Includes control start instruction If it is determined that the standard candidate value stored in the third storage unit is not stored, the candidate value recording unit records the standard candidate value stored in the first storage unit, and the first storage unit stores the standard candidate value stored in the first storage unit. A selection means for selecting a random value from a numerical value range having a candidate value as a maximum value, and when the transmission instruction is input after a waiting time calculated based on the random value selected by the selection means, And a means for transmitting a radio signal to the radio base station apparatus.

  The present invention is a radio communication system comprising a radio base station apparatus that performs transmission / reception using radio signals and a radio communication terminal that performs transmission / reception using radio signals according to a transmission instruction input at an arbitrary time. Then, the radio base station apparatus stores a plurality of combinations of information including a reception strength value of a radio signal received by the radio communication terminal and a predetermined value that increases as the reception strength value increases. A control start instruction based on the number of terminals measured by the measuring means and a preset threshold value, the measuring means for measuring the number of terminals of the wireless communication terminal in communication standby state or in communication A first determination unit that determines whether or not to transmit a radio signal; and when the first determination unit determines to transmit the control start instruction, from the fourth storage unit Means for reading a plurality of combinations of information consisting of a signal strength value and a predetermined value, and transmitting a radio signal including the read information and the control start instruction to the radio communication terminal, the radio communication terminal comprising: A third storage means for storing standard candidate values in advance; a wireless reception means for receiving a wireless signal transmitted from the wireless base station apparatus; and a control start instruction is included in the wireless signal received by the wireless reception means Second determination means for determining whether or not the radio signal is received, measurement means for measuring a reception intensity value of a radio signal received by the radio reception means, and outputting the measured reception intensity value, and the second determination means However, when it is determined that a control start instruction is included in the wireless signal, based on information of a plurality of combinations including a reception intensity value and a predetermined value included in the wireless signal received by the wireless reception unit The predetermined value corresponding to the received intensity value output from the measurement unit is recorded as a candidate value in a first storage unit, and the second determination unit includes a control start instruction in the radio signal. If it is determined that there is no candidate value recording means for recording the standard candidate value stored in the third storage means in the first storage means, and the candidate stored in the first storage means A selection means for selecting a random value from a numerical value range having a maximum value, and when the transmission instruction is input after a waiting time calculated based on the random value selected by the selection means, the wireless And a means for transmitting a radio signal to a base station apparatus.

  The present invention performs radio signal transmission / reception with a radio base station apparatus that performs radio signal transmission / reception and a radio signal according to a transmission instruction input at an arbitrary time, and increases a reception intensity value and the reception intensity value. Wireless communication in a wireless communication system comprising: a second storage means for storing a plurality of combinations of information consisting of a predetermined value that increases in accordance with the wireless communication terminal; and a wireless communication terminal provided with a third storage means for storing standard candidate values in advance. In the communication method, the wireless base station device measures the number of terminals of the wireless communication terminal in a communication standby state or in communication, and the wireless base station device is preset with the measured number of terminals. Determining whether to transmit a radio signal including a control start instruction based on a threshold; and determining that the radio base station apparatus transmits the control start instruction. In this case, a step of transmitting a wireless signal including the control start instruction to the wireless communication terminal, a step of receiving the wireless signal transmitted from the wireless base station device, and the wireless communication terminal, Determining whether or not a control start instruction is included in the received radio signal; and measuring the received intensity value of the received radio signal by the radio communication terminal and outputting the measured received intensity value; When the wireless communication terminal determines that a control start instruction is included in the wireless signal, information on a plurality of combinations of reception intensity values and predetermined values stored in the second storage means Recording the predetermined value corresponding to the received intensity value measured based on the first storage means as a candidate value, and the wireless communication terminal instructs the wireless signal to start control If it is determined that it is not included, the step of recording the standard candidate value stored in the third storage unit in the first storage unit, and the wireless communication terminal in the first storage unit The step of selecting a random number value from a numerical range in which the stored candidate value is the maximum value, and the transmission instruction is input after the standby time calculated based on the random value selected by the wireless communication terminal has elapsed. And a step of transmitting a radio signal to the radio base station device.

  The present invention performs transmission / reception by a radio signal, and stores information of a plurality of combinations including a reception intensity value of a radio signal received by the radio communication terminal and a predetermined value that increases as the reception intensity value increases. A radio base station apparatus comprising a fourth storage means, and a third storage means for performing transmission / reception by radio signals with the radio base station apparatus in accordance with a transmission instruction inputted at an arbitrary time, and storing standard candidate values in advance A wireless communication method in a wireless communication system comprising a wireless communication terminal provided with the wireless base station device measuring the number of terminals of the wireless communication terminal in a communication standby state or communicating, Determining whether or not the station apparatus transmits a radio signal including a control start instruction based on the measured number of terminals and a preset threshold; and When it is determined that the apparatus transmits the control start instruction, information of a plurality of combinations including the reception intensity value and a predetermined value is read from the fourth storage unit, and the read information and the control start instruction are A wireless signal including the step of transmitting to the wireless communication terminal, the wireless communication terminal receiving a wireless signal transmitted from the wireless base station device, and the wireless communication terminal starting to control the received wireless signal Determining whether or not an instruction is included; measuring a reception intensity value of a radio signal received by the radio communication terminal; outputting the measured reception intensity value; and When it is determined that a control start instruction is included in the wireless signal, a plurality of reception intensity values and predetermined values included in the wireless signal received by the wireless reception unit Recording the predetermined value corresponding to the received intensity value measured based on the matching information in a first storage means as a candidate value; and the wireless communication terminal, the second determination means, When it is determined that a control start instruction is not included in the wireless signal, the step of recording the standard candidate value stored in the third storage unit in the first storage unit, and the wireless communication terminal, A step of selecting a random value from a numerical range in which the candidate value stored in the first storage means is a maximum value, and a waiting time elapsed calculated by the wireless communication terminal based on the selected random value And a step of transmitting a radio signal to the radio base station apparatus when the transmission instruction is input later.

  The present invention provides a radio in a radio communication system comprising a radio base station apparatus that performs transmission / reception using radio signals and a radio communication terminal that performs transmission / reception using radio signals according to a transmission instruction input at an arbitrary time. A communication terminal computer for receiving a radio signal transmitted from the radio base station apparatus; measuring a reception intensity value of the radio signal received by the radio reception means; and outputting the measured reception intensity value The predetermined value corresponding to the received intensity value output from the measuring means based on information of a plurality of combinations consisting of a measuring means, a received intensity value and a predetermined value that increases as the received intensity value increases Candidate value recording means for recording as a candidate value in the first storage means, a numerical value range in which the candidate value stored in the first storage means is the maximum value Selection means for selecting a random number value, and when the transmission instruction is input after the waiting time calculated based on the random value selected by the selection means has elapsed, a radio signal is transmitted to the radio base station apparatus It is a computer program for functioning as a wireless transmission means.

  The present invention relates to a computer of a radio base station apparatus in a radio communication system comprising a radio base station apparatus that performs transmission / reception using radio signals and a radio communication terminal that performs transmission / reception using radio signals with the radio base station apparatus. Alternatively, based on the measurement means for measuring the number of terminals of the wireless communication terminal in communication, the number of terminals measured by the measurement means and a preset threshold value, the wireless communication terminal is configured to perform wireless communication according to a reception intensity value on the wireless communication terminal side. A determination unit that determines whether or not to transmit a radio signal including a control start instruction for starting control of a radio signal transmission interval of a communication terminal, and when the determination unit determines to transmit the control start instruction, A computer program for causing a wireless signal including the control start instruction to be transmitted to the wireless communication terminal.

  The present invention relates to a radio base station apparatus that performs transmission / reception using a radio signal, a radio signal reception intensity value that is transmitted / received to / from the radio base station apparatus, and a predetermined value that increases as the reception intensity value increases. A computer of a radio base station apparatus in a radio communication system comprising a radio communication terminal comprising a storage means for storing a plurality of combinations of information comprising a plurality of reception intensity values and predetermined values from the storage means Is a computer program for functioning as wireless transmission means for reading information on the combination of the above and transmitting a wireless signal including the read information to the wireless communication terminal.

  The present invention is a computer-readable recording medium recording any one of the computer programs described above.

  According to the present invention, the wireless communication terminal measures the reception intensity value of the received wireless signal. Based on information of a plurality of combinations consisting of a reception strength value and a predetermined value that increases as the reception strength value increases, a predetermined value corresponding to the measured reception strength value is recorded as a candidate value in the storage means, A random value is selected from a numerical range in which the candidate value is the maximum value. And when the transmission instruction | indication is input after the standby | waiting time calculated based on the random value to select, it was set as the structure which transmits a radio signal to a radio base station apparatus. With this configuration, it is possible to perform control to increase and decrease the standby time stochastically. That is, as the reception strength value of the received radio signal is larger, a random value is selected from a wider range, and the probability that a larger random value is selected increases. That is, it is possible to reduce the probability that communication is performed in a radio communication terminal that is close to the radio base station apparatus in which the reception intensity value is large. In addition, the smaller the reception strength value of the radio signal to be received, the more random value is selected from a narrow range, and the probability that a small random value will be selected increases. That is, it is possible to increase the probability that communication is performed in a radio communication terminal that is far from the radio base station apparatus with a small reception intensity value. Thereby, it becomes possible to maintain the fairness of the number of times of communication performed with the radio base station apparatus without depending on the distance from the radio base station apparatus.

  Further, according to the present invention, the wireless communication terminal stores in advance information of a plurality of combinations including a reception strength value of a wireless signal and a predetermined value that increases as the reception strength value increases. On the basis of the information, a predetermined value corresponding to the measured received intensity value is recorded as a candidate value in the storage means. Thereby, it is possible to perform control to increase and decrease the standby time stochastically with only the configuration of the radio communication terminal without depending on the configuration of the radio base station apparatus.

  According to the present invention, the wireless communication terminal converts the received strength value to a measured received strength value based on a plurality of combinations of information including a received strength value and a predetermined value that increases as the received strength value increases. A corresponding predetermined value is recorded in the storage means as a candidate value. As a result, it is possible to receive information consisting of a combination of a reception intensity value and a predetermined value from the radio base station apparatus, and probabilistically increase and decrease standby time without setting the information in the radio communication terminal in advance. It is possible to perform control.

  According to the present invention, the wireless communication terminal stores the standard candidate value in advance, determines whether or not the received radio signal includes a control start instruction, and includes the control start instruction in the radio signal. A predetermined value corresponding to the measured received intensity value is recorded in the storage means as a candidate value, and if it is determined that a control start instruction is not included in the radio signal, the stored standard The candidate value is recorded in the storage means. As a result, only when the control start instruction is included, it is possible to perform control to increase and decrease the standby time stochastically.

  Further, according to the present invention, the radio base station apparatus measures the number of terminals in a communication standby state or in communication, and based on the measured number of terminals and a preset threshold value, It is determined whether or not to transmit a radio signal including a control start instruction for starting control of the radio signal transmission interval of the radio communication terminal according to the received intensity value. And when it determines with transmitting a control start instruction | indication, it was set as the structure which transmits the radio signal containing a control start instruction | indication to a radio | wireless communication terminal. As a result, it is possible to cause the wireless communication terminal to start control to increase and decrease the standby time stochastically in accordance with the number of wireless communication terminals that exist in an area that can communicate with the wireless base station device.

  Further, according to the present invention, the radio base station apparatus stores information of a plurality of combinations including a reception strength value of a radio signal received by a radio communication terminal and a predetermined value that increases as the reception strength value increases. Remember. And it was set as the structure which reads the information of the several combination which consists of the memorize | stored received intensity value and predetermined value, and transmits the radio signal containing the read information and a control start instruction | indication to a radio | wireless communication terminal. Thereby, the radio base station apparatus can cause the radio communication terminal to receive information on a plurality of combinations including a control start instruction, a reception intensity value, and a predetermined value, and the standby time is stochastically based on the information. It is possible to cause the wireless communication terminal to perform control for increasing and decreasing.

  Further, according to the present invention, the radio base station apparatus stores information of a plurality of combinations including a reception strength value of a radio signal received by a radio communication terminal and a predetermined value that increases as the reception strength value increases. The information is stored in a plurality of combinations of the received intensity value and the predetermined value, and a wireless signal including the read information is transmitted to the wireless communication terminal. As a result, it is possible to cause the wireless communication terminal to perform control to increase and decrease the standby time stochastically. As a result, the radio base station apparatus can cause the radio communication terminal to receive information of a plurality of combinations including the reception intensity value and the predetermined value, and increase and decrease the standby time stochastically based on the information. It is possible to cause the wireless communication terminal to perform control.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic block diagram showing a wireless communication system 1 according to the present embodiment.
The wireless communication system 1 includes a plurality of wireless communication terminals 10-1 to 10-3 (hereinafter referred to as a wireless communication terminal 10 when the entire wireless communication terminal is shown) and a wireless base station device 30.

  The wireless communication terminal 10 is a portable terminal device having, for example, an IEEE802.11 wireless LAN system, and performs communication with the wireless base station device 30 by a wireless signal at an arbitrary time.

The wireless base station device 30 is, for example, an AP (Access Point) in a wireless LAN system of IEEE 802.11, is connected to a network such as the Internet, transmits a wireless signal received from the wireless communication terminal 10 to the network, Information received from the network is converted into a radio signal and transmitted to the radio communication terminal 10.
In addition, the broken line in FIG. 1 has shown the distance from the radio base station apparatus 30, and has shown that the distance is long in order of the radio | wireless communication terminals 10-1, 10-2, and 10-3.

FIG. 2 is a diagram showing an outline of CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance), which is an access control method in the wireless LAN system of IEEE802.11 in the wireless communication system 1.
In FIG. 2, the first state is that the wireless communication terminal 10 is busy. The busy state is a state in which communication is performed between another wireless communication terminal and the wireless base station device 30. The wireless communication terminal 10 determines that it is in a busy state by detecting the presence of a wireless signal transmitted / received between another wireless communication terminal and the wireless base station device 30. The wireless communication terminal 10 reads the value of the back-off window size set in advance in the internal storage area during the busy state. Here, the value of the back-off window size is 63. Then, a uniform random number is generated within a numerical value range of 0 to 63, and a value obtained by adding 1 to record the random number value obtained by the generation in association with the slot position is recorded in the internal storage area. Here, it is assumed that 9 is selected as the random value and 10 is recorded as the value corresponding to the slot position where the radio signal is transmitted.

  When detecting that there is no radio signal transmitted / received between the other radio communication terminal and the radio base station apparatus 30, the radio communication terminal 10 transitions from the busy state to the idle state. After entering the idle state, the wireless communication terminal 10 waits for the DIFS time, and after the DIFS time elapses, the wireless communication terminal 10 is selected at a time corresponding to one slot of a slot predetermined in the IEEE802.11 wireless LAN system. A waiting time that is a time obtained by multiplying a random value obtained by adding 10 that is a value of 1, ie, a time corresponding to 10 slots, is further waited. Then, after the standby time has elapsed, a radio signal is transmitted to the radio base station apparatus 30. With this method, the time for transmission from each wireless communication terminal 10 to the wireless base station device 30 is distributed by uniform random numbers, and the probability of collision can be reduced.

  The radio base station apparatus receives radio signals from other radio communication terminals during the DIFS time or during the standby time after the DIFS time has elapsed and the time for one slot multiplied by a value obtained by adding 1 to the random number value. When the wireless communication terminal 10 is transmitted to 30, the wireless communication terminal 10 that is on standby further waits because the state transitions from the idle state to the busy state again. At this time, when the standby wireless communication terminal 10 becomes busy, it stores the remaining standby time obtained by subtracting the elapsed time after the DIFS time has elapsed from the standby time, and then enters the idle state. In this case, the radio signal is transmitted to the radio base station apparatus 30 after the DIFS time has elapsed and the stored remaining standby time has elapsed without generating a uniform random number. Thereby, when the distance between the radio communication terminal 10 and the radio base station apparatus 30 is the same and the reception intensity value of the radio signal is the same, communication between the radio communication terminal 10 and the radio base station apparatus 30 is performed. The number of times will maintain fairness according to the degree of variation of uniform random numbers.

Next, two embodiments of the radio communication system that changes the back-off window size based on the reception intensity value that changes according to the distance from the radio base station apparatus 30 according to the present invention will be described below.
The first embodiment is an embodiment in which the wireless communication terminal 10 stores therein a plurality of combinations of information including reception intensity values and backoff window size values in advance. Further, the second embodiment is an embodiment in which information of a plurality of combinations including a reception intensity value and a backoff window size value is transmitted from the radio base station apparatus 30 to the radio communication terminal.

(First embodiment)
FIG. 3 is a block diagram showing an internal configuration of the wireless communication terminal 10a according to the first embodiment. In FIG. 3, the radio reception unit 16 receives and demodulates a radio signal received from the radio base station apparatus 30a according to the first embodiment, which will be described later, by the antenna 15, and reads information contained in the radio signal. The radio transmission unit 17 converts information input by the information input unit 19 into a radio signal, and transmits the radio signal to the radio base station device 30a according to the first embodiment described later using the antenna 15. Further, the wireless transmission unit 17 executes the above-described access control procedure by CSMA / CA.

  The detection unit 18 detects a busy state and an idle state in the above-described IEEE802.11 wireless LAN system based on information read from the wireless signal by the wireless reception unit 16. The measurement unit 12 measures a reception intensity value of a broadcast radio signal (hereinafter referred to as a broadcast signal) periodically transmitted from the radio base station device 30a received by the radio reception unit 16. The determination unit 13 determines whether or not the broadcast signal received by the wireless reception unit 16 includes a control start instruction for controlling the back-off window size based on the reception intensity value.

  The storage unit 20a stores candidate value data 21, standard value data 22, and correspondence table data 23 shown in FIG. Here, the candidate value data 21 is a back-off window size value used by the wireless communication terminal 10a when the above-described access control by CSMA / CA is performed. The standard value data 22 is a predetermined default value, that is, a standard back-off window size value, and is used when a control start instruction is not included in the broadcast signal from the radio base station apparatus 30a. The correspondence table data 23 is a value of the backoff window size for each range of the reception strength value of the wireless signal set in advance, and is used when a control start instruction is included in the broadcast signal from the wireless base station device 30a. It is done. Here, when the range of the received intensity value is in the range of 0 to −10, a received intensity value of less than 0 to −10 or more corresponds.

  Here, the value of the back-off window size corresponding to the reception strength value set in the correspondence table data 23 is set so that the value of the back-off window size increases as the reception strength value increases. For example, when the reception strength value is divided into N stages and the backoff window size when the reception strength value is the largest is BO_1, BO_N which is the backoff window size when the reception strength value is the smallest is BO_1 / N. Set as follows. FIG. 4C shows an example in which the received intensity value changes by −10 between 0 and −120 and the backoff window size changes by 5 between 60 and 5 when N = 12. ing.

  In FIG. 3, the selection unit 11 reads the value set in the candidate value data 21 of the storage unit 20a as the back-off window size, and uniform random numbers in a range from 0 to the maximum value of the back-off window size. And a random value obtained by the generation is output to the wireless transmission unit 17. When the determination unit 13 includes a control start instruction in the broadcast signal, the candidate value recording unit 14a stores the back-off window size value corresponding to the reception intensity value of the radio signal measured by the measurement unit 12 in the storage unit 20a. The value is read from the correspondence table data 23, and the read value is recorded in the candidate value data 21 of the storage unit 20a. When the determination unit 13 does not include a control start instruction in the broadcast signal, the backoff window size value stored in the standard value data 22 of the storage unit 20 a is recorded in the candidate value data 21.

  FIG. 5 is a block diagram showing an internal configuration of the radio base station apparatus 30a according to the first embodiment. In the radio base station apparatus 30a, the radio reception unit 32 demodulates a radio signal received from the radio communication terminal 10a by the antenna 31, and reads information included in the radio signal. The wireless transmission unit 33 converts information to be transmitted to the wireless communication terminal 10 into a wireless signal and transmits it by the antenna 31. Further, the wireless transmission unit 33 receives an output from the determination unit 35 described later, and transmits a broadcast signal including a control start instruction for causing the wireless communication terminal 10a to start control of the backoff window size.

  The measuring unit 34 measures the number of terminals of the wireless communication terminal 10a in communication for a predetermined time based on the wireless signal received by the wireless receiving unit 32. The determination unit 35 determines whether or not the number of wireless communication terminals 10a in communication within a certain time measured by the measurement unit 34 is equal to or greater than a preset threshold value. If the number of terminals is equal to or greater than the threshold value, wireless transmission is performed. An instruction for causing the unit 33 to transmit a control start instruction is output.

  Next, processing of the radio base station device 30a and the radio communication terminal 10a according to the first embodiment will be described with reference to FIGS. FIG. 6 is a flowchart showing processing of the radio base station device 30a. First, the measurement unit 34 of the radio base station device 30a measures the number of terminals of the radio communication terminal 10a in communication (Step Sa1). Next, the determination unit 35 determines whether or not the number of terminals measured by the measurement unit 34 is equal to or greater than a preset threshold value (step Sa2). When the number of terminals is equal to or greater than the threshold, the determination unit 35 outputs an instruction for transmitting a control start instruction to the wireless transmission unit 33. The wireless transmission unit 33 to which the instruction is input transmits a broadcast signal including a control start instruction when transmitting the broadcast signal (step Sa3). On the other hand, when the number of terminals is less than the threshold, the determination unit 35 outputs nothing, and the wireless transmission unit 33 transmits a broadcast signal that does not include a control start instruction when transmitting the broadcast signal (step Sa4).

  FIG. 7 is a flowchart showing processing of the wireless communication terminal 10a. First, the radio receiving unit 16 of the radio communication terminal 10a receives a broadcast signal transmitted from the radio base station device 30a, demodulates the received broadcast signal, and reads information included in the broadcast signal (step Sb1). ). Next, the determination unit 13 determines whether or not a control start instruction is included in the information read from the broadcast signal by the wireless reception unit 16 (step Sb2). When the determination unit 13 determines that the control start instruction is included, the measurement unit 12 measures the reception intensity value of the broadcast signal for a certain period of time (step Sb4). Then, the candidate value recording unit 14a reads the back-off window size corresponding to the reception intensity value measured by the measurement unit 12 based on the correspondence table data 23 set in advance in the storage unit 20a, and the read back-off window size Is recorded in the candidate value data 21 of the storage unit 20a (step Sb5). On the other hand, when the determination unit 13 determines that the control start instruction is not included, the candidate value recording unit 14a reads the value of the back-off window size of the standard value data 22 preset in the storage unit 20a, The candidate value data 21 is recorded (step Sb3). Thereby, when the control start instruction is included in the broadcast signal from the radio base station apparatus 30a, the back-off window size according to the reception intensity value can be set. On the other hand, when the control start instruction is not included, that is, when the control for changing the back-off window size is canceled, the value of the standard back-off window size can be restored.

FIG. 8 is a flowchart showing a process for controlling the backoff window size based on the access control method by CSMA / CA in the radio communication terminal 10a.
As a premise of the operation shown in FIG. 8, it is assumed that the value of the back-off window size is set in the candidate value data 21 of the storage unit 20a by the process shown in FIG. Further, it is assumed that the busy state has already been detected by the detection unit 18.

  When information is input by the information input unit 19 of the wireless communication terminal 10a in the busy state, a transmission instruction is input by the information input unit 19 to the wireless transmission unit 17 (step Sc1). A transmission instruction is input to the wireless transmission unit 17 and a transmission instruction is also input to the selection unit 11. The selection unit 11 reads the backoff window size value from the candidate value data 21 of the storage unit 20 a and reads it from 0. A uniform random number is generated within a range of values, and a random value obtained by the generation is output to the wireless transmission unit 17. In the example of FIG. 4A, since 50 is set as the value of the back-off window size, uniform random numbers are generated in the range of 0 to 50. The wireless transmission unit 17 calculates a standby time calculated by multiplying the value obtained by adding 1 to the random value output from the selection unit 11 by the time for one slot (step Sc2). Then, the wireless transmission unit 17 waits until the DIFS time elapses after the detection unit 18 detects the idle state (step Sc3).

  After waiting until the DIFS time has elapsed, the wireless transmission unit 17 measures the elapsed time since the DIFS time has elapsed, and determines whether or not the measured elapsed time exceeds the calculated standby time ( Step Sc4). While the elapsed time does not exceed the standby time, the wireless transmission unit 17 determines whether the busy state is not detected by the detection unit 18 (step Sc5). If the detection unit 18 detects a busy state while the elapsed time does not exceed the standby time (Sc5; Yes), a value obtained by subtracting the elapsed time from the standby time is set as the standby time, and the process of step Sc3 is performed. Return (step Sc6). On the other hand, when the measured elapsed time exceeds the standby time (Sc4; Yes), the wireless transmission unit 17 transmits a wireless signal including information input by the information input unit 19 (step Sc7).

In the example of FIG. 8, an example is shown in which the backoff window is controlled by inputting a transmission instruction in the busy state. However, the present invention is not limited to this mode, and the transmission instruction is input in the idle state. May be activated when the elapsed time since entering the idle state is less than the DIFS time.
When data communication is completed by transmitting data and receiving ACK when the wireless communication terminal 10a receives data, the data communication is completed regardless of whether or not a transmission instruction is input. The process may be activated.

  Although not shown in FIG. 8, if the elapsed time since the detection of the idle state has exceeded the DIFS time, the data is transmitted without controlling the back-off window. Also good.

  With the above configuration, the back-off window size can be changed according to the reception strength value of the radio signal received by the radio communication terminal 10a. The wireless communication terminal 10a having a short distance from the radio base station device 30a is configured so that the backoff window size value is increased in advance in the correspondence table data 23 as the reception strength value increases. Since the value is large, a large backoff window size is selected. When a large backoff window size is selected, a random value is selected from a long time range in access control by CSMA / CA, and a standard backoff window size is set. The probability of waiting for a longer time than other wireless terminal devices 10a increases.

  On the other hand, since the radio communication terminal 10a that is far from the radio base station device 30a has a small reception intensity value, a small back-off window size is selected. The selection of a small back-off window size means that a random value is selected from a short time range, and the other wireless communication terminal 10a in which a standard back-off window size is set. There is a higher probability that the waiting time will be shorter. As a result, the number of times of communication between all the radio communication terminals 10a can be determined without depending on the distance from the radio base station device 30a by the combination of the reception intensity value and the back-off window size value set in the correspondence table data 23. It becomes possible to maintain fairness.

  Note that the radio communication terminal 10a and the radio base station apparatus 30a according to the first embodiment correspond to the radio communication terminal 10 and the radio base station apparatus 30 in the configuration of the radio communication system 1, respectively.

  In the first embodiment, when the broadcast start signal transmitted from the radio base station device 30a includes a control start instruction, the radio communication terminal 10a performs a process of changing the value of the backoff window size. It was. However, the present invention is not limited to this embodiment, and the radio communication terminal 10a always receives from the radio base station apparatus 30a regardless of whether or not a control start instruction is included in the broadcast signal from the radio base station apparatus 30a. The reception intensity value of the radio signal to be measured may be measured, and the back-off window size may be changed to the back-off window size value corresponding to the reception intensity value measured based on the correspondence table data 23.

(Second Embodiment)
Next, the radio communication terminal 10b and the radio base station apparatus 30b according to the second embodiment will be described. As described above, in the second embodiment, when the radio base station device 30b determines that the back-off window size needs to be changed, the combination of the reception strength value and the back-off window size value is used. Information is transmitted to the wireless communication terminal 10b.

  FIG. 9 is a block diagram showing an internal configuration of the wireless communication device 10b according to the second embodiment. In the wireless communication device 10b according to the second embodiment, configurations other than the storage unit 20b and the candidate value recording unit 14b are the same as the configuration of the wireless communication terminal 10a according to the first embodiment, and thus are denoted by the same reference numerals. Hereinafter, the storage unit 20b and the candidate value recording unit 14b will be described.

  The recording unit 20b stores the candidate value data 21 and the standard value data 22 as in the storage unit 20a of the first embodiment, but the correspondence table data 23 is the same as the correspondence table data 23 from the radio base station device 30b. The correspondence table data of the data structure is not stored because it is received.

  The candidate value recording unit 14b reads correspondence table data included in the broadcast signal received by the wireless reception unit 16, and corresponds to the reception intensity value of the broadcast signal measured by the measurement unit 12 based on the read correspondence table data. The back-off window size value is read, and the read back-off window size value is recorded in the candidate value data 21 of the recording unit 20b.

  FIG. 10 is a block diagram showing an internal configuration of the radio base station apparatus 30b according to the second embodiment. In the radio base station apparatus 30b according to the second embodiment, a storage unit 36 that stores correspondence table data is added to the configuration of the radio base station apparatus 30a according to the first embodiment, and the radio transmission unit 33 instructs to start control. Is different from the radio base station apparatus 30a according to the first embodiment in that the correspondence table data is read from the storage unit 36 and the broadcast signal including the correspondence table data is transmitted. As described above, the correspondence table data stored in the storage unit 36 is data having the same data configuration as the correspondence table data 23 according to the first embodiment.

Next, with reference to FIG.11 and FIG.12, the process of the radio | wireless communications system which concerns on 2nd Embodiment is demonstrated.
FIG. 11 is a flowchart showing processing of the radio base station device 30b. First, the measurement unit 34 of the radio base station device 30b measures the number of terminals of the radio communication terminal 10b in communication (step Sd1). Next, the determination unit 35 determines whether or not the number of terminals measured by the measurement unit 34 is equal to or greater than a preset threshold value (step Sd2). When the number of terminals is equal to or greater than the threshold, the determination unit 35 outputs an instruction for transmitting a control start instruction to the wireless transmission unit 33. The wireless transmission unit 33 to which the instruction is input reads the correspondence table data from the storage unit 36 when transmitting the broadcast signal, and transmits the broadcast signal including the read correspondence table data and the control start instruction (step Sd3). ). On the other hand, when the number of terminals is less than the threshold, the determination unit 35 outputs nothing, and the wireless transmission unit 33 transmits a broadcast signal that does not include a control start instruction when transmitting the broadcast signal (step Sd4).

  FIG. 12 is a flowchart showing processing of the wireless communication terminal 10b. First, the radio reception unit 16 of the radio communication terminal 10b receives a broadcast signal transmitted from the radio base station device 30b, demodulates the received broadcast signal, and reads information included in the broadcast signal (step Se1). ). Next, the determination unit 13 determines whether or not a control start instruction is included in the information read from the broadcast signal by the wireless reception unit 16 (step Se2). When the determination unit 13 determines that the control start instruction is included, the measurement unit 12 measures the reception intensity value of the broadcast signal for a certain period of time (step Se4). Then, the candidate value recording unit 14b reads the backoff window size corresponding to the reception intensity value measured by the measurement unit 12 based on the correspondence table data included in the information read by the wireless reception unit 16, and reads the backoff window read out The size is recorded in the candidate value data 21 of the storage unit 20b (step Se5). On the other hand, when the determination unit 13 determines that the control start instruction is not included, the candidate value recording unit 14b reads the value of the back-off window size of the standard value data 22 preset in the storage unit 20b, The candidate value data 21 is recorded (step Se3). As a result, when a control start instruction is included in the broadcast signal from the radio base station device 30b, the backoff window size corresponding to the received intensity value is set based on the correspondence table data also included in the broadcast signal. can do. On the other hand, when the control start instruction is not included, that is, when the control for changing the back-off window is released, the value of the standard back-off window size can be restored.

  The access control process after the value of the back-off window size is set in the candidate value data 21 is the same as the process in the first embodiment described with reference to FIG.

  With the above configuration, the back-off window size can be changed according to the reception strength value of the radio signal received by the radio communication terminal 10b, as in the first embodiment. Further, even if the combination information including the reception intensity value and the back-off window size value is not stored in advance in the wireless communication terminal 10b, each wireless communication terminal 10b can be set by setting in the wireless base station device 30b. Can be sent to.

  Note that the radio communication terminal 10b and the radio base station apparatus 30b according to the second embodiment correspond to the radio communication terminal 10 and the radio base station apparatus 30 in the configuration of the radio communication system 1, respectively.

  In the second embodiment, the correspondence table data set in the storage unit 36 of the radio base station device 30b is set in advance. However, the present invention is not limited to this embodiment, and the measurement unit 34 The radio base station apparatus 30b may change the value of the correspondence table data according to the number of terminals to be measured. Thereby, it is possible to change the value of the back-off window size according to the number of terminals.

  The first storage unit described above corresponds to the candidate value data 21 of the storage unit 20a and the storage unit 20b, the second storage unit corresponds to the correspondence table data of the storage unit 20a, and the third storage unit. Corresponds to the standard value data 22 of the storage unit 20a and the storage unit 20b. The fourth storage means corresponds to the storage unit 36.

  In the above embodiment, the random number is assumed to be a uniform random number, but is not limited to a uniform random number, and may be a normal random number, an exponential random number, or the like.

  In the above embodiment, the control for changing the back-off window size is performed based on the IEEE802.11 wireless LAN system. However, the present invention is not limited to this embodiment. For example, TDMA / TDD ( It can also be applied to a channel selection method at the time of random access in RCH (Random access CHannel) in a radio communication system of Time Division Multiple Access / Time Division Duplex, and by this application, even in a TDMA / TDD radio communication system, distance Regardless, the number of communication times of all wireless communication terminals can be made the same.

  Further, the radio base station apparatus 30 according to the first and second embodiments controls whether to include a control start instruction in the broadcast signal based on the number of radio communication terminals 10 that are in communication. However, the present invention is not limited to this embodiment. For example, in the TDMA / TDD wireless communication system, control based on the number of wireless communication terminals 10 in the communication standby state, that is, in the association state may be performed.

  In the first and second embodiments described above, the control start instruction is included in the broadcast signal and transmitted. However, the present invention is not limited to this embodiment, and the signal for the control start instruction is transmitted. And the radio base station apparatus 30 may transmit the signal to the corresponding radio communication terminal 10.

  In the first and second embodiments, a Persistent Factor (hereinafter referred to as PF) value can be added to a predetermined value that increases as the reception strength value increases. This is because by adding the PF value, retransmission control can be performed by a back-off window according to the wireless communication state.

  In the existing IEEE802.11 wireless LAN system, when collision occurs and retransmission is performed, the value of the back-off window size is doubled and retransmission processing is performed. This is because the above-mentioned PF value is set to 2, so that the back-off window size twice as large is applied by multiplying the back-off window size value by the PF value. Because. Further, in the existing IEEE802.11 wireless LAN system, when retransmission fails and further retransmission is performed, the backoff window size is further increased. This configuration is multiplied by the value of the PF value. This is realized by further multiplying the value of the back-off window by the PF value.

  Hereinafter, in the wireless communication terminal 10 of the first and second embodiments, the reception strength value is applied while applying the configuration for changing the backoff window size value using the PF value in the existing IEEE802.11 wireless LAN system. A configuration in which the PF value is applied to a predetermined value that increases as the value increases will be described.

  First, a PF value corresponding to the received intensity value is stored in the correspondence table data. For example, when the received intensity value is “0 to −60”, the PF value is “2”, and when it is “−60 to −120”, the PF value is “1.5”. Data in which the PF value changes is set in advance. When a collision occurs and retransmission is performed, the backoff window size value obtained from the correspondence table data corresponding to the reception strength value and the PF value obtained from the correspondence table data corresponding to the reception strength value are also used. Is stored in the candidate value data, a uniform random number is generated from the candidate value, and the waiting time is calculated based on the random value obtained by the generation. Further, when retransmission is failed and further retransmission is performed, a value obtained by further multiplying the candidate value data by the PF value is stored in the candidate value data. When retransmission is successful, or when the number of retransmissions reaches a predetermined number and the retransmission process is stopped, the candidate value data is set to the value of the backoff window size obtained from the correspondence table data corresponding to the reception intensity value at that time. By returning it, it is possible to realize a configuration in which the PF value is applied to the predetermined value.

  The wireless terminal device 10a and the wireless base station device 30a according to the first embodiment described above and the wireless terminal device 10b and the wireless base station device 30b according to the second embodiment have a computer system therein. The process for changing the value of the back-off window size and the process for access control are stored in a computer-readable recording medium in the form of a program, and the program is read out and executed by the computer. Processing is performed. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

It is a block diagram which shows the structure of the radio | wireless communications system by this embodiment. It is the figure which showed the outline of the access control in the same embodiment. It is the block diagram which showed the internal structure of the radio | wireless communication terminal which concerns on 1st Embodiment. It is the figure which showed the data memorize | stored in the memory | storage part of the radio | wireless communication terminal which concerns on 1st Embodiment. It is the block diagram which showed the internal structure of the wireless base station apparatus which concerns on 1st Embodiment. 5 is a flowchart showing processing of the radio base station apparatus according to the first embodiment. It is the flowchart which showed the process of the radio | wireless communication terminal which concerns on 1st Embodiment. 5 is a flowchart showing access control processing of the wireless communication terminal according to the first embodiment. It is the block diagram which showed the internal structure of the radio | wireless communication terminal which concerns on 2nd Embodiment. It is the block diagram which showed the internal structure of the wireless base station apparatus which concerns on 2nd Embodiment. It is the flowchart which showed the process of the radio base station apparatus which concerns on 2nd Embodiment. It is the flowchart which showed the process of the radio | wireless communication terminal which concerns on 2nd Embodiment.

Explanation of symbols

10a wireless communication terminal 11 selection unit 12 measurement unit 13 determination unit 14a candidate value recording unit 15 antenna 16 wireless reception unit 17 wireless transmission unit 18 detection unit 19 information input unit 20a storage unit

Claims (15)

A wireless communication terminal in a wireless communication system comprising: a wireless base station device that performs transmission / reception using a wireless signal; and a wireless communication terminal that performs transmission / reception using a wireless signal with the wireless base station device according to a transmission instruction input at an arbitrary time. And
Radio receiving means for receiving a radio signal transmitted from the radio base station device;
Measuring means for measuring a received intensity value of a radio signal received by the wireless receiving means and outputting the measured received intensity value;
The predetermined value corresponding to the received intensity value output from the measuring means is selected as a candidate value based on information of a plurality of combinations including a received intensity value and a predetermined value that increases as the received intensity value increases. Candidate value recording means for recording in the first storage means as
Selecting means for selecting a random number value from a numerical value range in which the candidate value stored in the first storage means is a maximum value;
Radio transmission means for transmitting a radio signal to the radio base station apparatus when the transmission instruction is input after the elapse of a standby time calculated based on the random value selected by the selection means;
A wireless communication terminal comprising: Second storage means for storing information of a plurality of combinations of the received intensity value and a predetermined value that increases as the received intensity value increases;
The candidate value recording means includes:
Candidate the predetermined value corresponding to the reception intensity value output from the measurement means based on information of a plurality of combinations of reception intensity values and predetermined values stored in the second storage means The wireless communication terminal according to claim 1, wherein the value is recorded in a first storage means as a value. The radio reception means receives a radio signal including information of a plurality of combinations consisting of the reception intensity value and a predetermined value that increases as the reception intensity value increases from the radio base station apparatus,
The candidate value recording means includes:
Based on information of a plurality of combinations consisting of a reception intensity value included in the radio signal received by the radio reception means and a predetermined value that increases as the reception intensity value increases, the measurement means that is output from the measurement means The wireless communication terminal according to claim 1, wherein the predetermined value corresponding to the reception intensity value is recorded as a candidate value in a first storage means. Determination means for determining whether or not a control start instruction is included in a wireless signal received by the wireless reception means;
Third storage means for storing standard candidate values in advance,
The candidate value recording means includes:
When the determination unit determines that the wireless signal includes a control start instruction, the predetermined value corresponding to the reception intensity value output from the measurement unit is set as a candidate value in the first storage unit. When the determination unit determines that the wireless signal does not include a control start instruction, the standard candidate value stored in the third storage unit is recorded in the first storage unit. The wireless communication terminal according to claim 1, wherein the wireless communication terminal is a wireless communication terminal. A radio base station apparatus in a radio communication system comprising: a radio base station apparatus that performs transmission / reception using a radio signal; and a radio communication terminal that performs radio signal transmission / reception with the radio base station apparatus,
Measuring means for measuring the number of the wireless communication terminals in communication standby state or in communication;
Control for starting control of the radio signal transmission interval of the radio communication terminal according to the reception intensity value on the radio communication terminal side based on the number of terminals measured by the measuring means and a preset threshold value Determining means for determining whether or not to transmit a radio signal including a start instruction;
A wireless transmission means for transmitting a wireless signal including the control start instruction to the wireless communication terminal when the determination means determines to transmit the control start instruction;
A radio base station apparatus comprising: Storage means for storing information of a plurality of combinations consisting of a reception strength value of a radio signal received by the wireless communication terminal and a predetermined value that increases as the reception strength value increases;
The wireless transmission means includes
A plurality of combinations of information including the received intensity value and a predetermined value are read from the storage unit, and a radio signal including the read information and the control start instruction is transmitted to the radio communication terminal. Item 6. The radio base station apparatus according to Item 5. A radio base station apparatus in a radio communication system comprising: a radio base station apparatus that performs transmission / reception using a radio signal; and a radio communication terminal that performs radio signal transmission / reception with the radio base station apparatus,
Storage means for storing information of a plurality of combinations consisting of a reception strength value of a radio signal received by the wireless communication terminal and a predetermined value that increases as the reception strength value increases;
Radio transmission means for reading out information of a plurality of combinations consisting of the reception intensity value and a predetermined value from the storage means, and transmitting a radio signal including the read information to the radio communication terminal;
A radio base station apparatus comprising: A radio communication system comprising: a radio base station apparatus that performs transmission / reception using a radio signal; and a radio communication terminal that performs transmission / reception using a radio signal according to a transmission instruction input at an arbitrary time,
The wireless base station device
Measuring means for measuring the number of the wireless communication terminals in communication standby state or in communication;
First determination means for determining whether to transmit a radio signal including a control start instruction based on the number of terminals measured by the measurement means and a preset threshold value;
Means for transmitting a radio signal including the control start instruction to the radio communication terminal when the first determination means determines to transmit the control start instruction;
The wireless communication terminal is
Second storage means for storing a plurality of combinations of information including the reception strength value and a predetermined value that increases as the reception strength value increases;
Third storage means for storing standard candidate values in advance;
Radio receiving means for receiving a radio signal transmitted from the radio base station device;
Second determination means for determining whether or not a control start instruction is included in a wireless signal received by the wireless reception means;
Measuring means for measuring a received intensity value of a radio signal received by the wireless receiving means and outputting the measured received intensity value;
When the second determination unit determines that the radio signal includes a control start instruction, a plurality of combinations of reception intensity values stored in the second storage unit and predetermined values are stored. Based on the information, the predetermined value corresponding to the received intensity value output from the measurement unit is recorded as a candidate value in a first storage unit, and the second determination unit instructs the radio signal to start control. A candidate value recording means for recording the standard candidate value stored in the third storage means in the first storage means,
Selecting means for selecting a random number value from a numerical value range in which the candidate value stored in the first storage means is a maximum value;
Means for transmitting a radio signal to the radio base station apparatus when the transmission instruction is input after the waiting time calculated based on the random value selected by the selection means has elapsed;
A wireless communication system comprising: A radio communication system comprising: a radio base station apparatus that performs transmission / reception using a radio signal; and a radio communication terminal that performs transmission / reception using a radio signal according to a transmission instruction input at an arbitrary time,
The wireless base station device
Fourth storage means for storing information of a plurality of combinations consisting of a reception strength value of a radio signal received by the wireless communication terminal and a predetermined value that increases as the reception strength value increases;
Measuring means for measuring the number of the wireless communication terminals in communication standby state or in communication;
First determination means for determining whether to transmit a radio signal including a control start instruction based on the number of terminals measured by the measurement means and a preset threshold value;
When the first determination unit determines to transmit the control start instruction, information of a plurality of combinations including the reception intensity value and a predetermined value is read from the fourth storage unit, and the read information and the control Means for transmitting a wireless signal including a start instruction to the wireless communication terminal,
The wireless communication terminal is
Third storage means for storing standard candidate values in advance;
Radio receiving means for receiving a radio signal transmitted from the radio base station device;
Second determination means for determining whether or not a control start instruction is included in a wireless signal received by the wireless reception means;
Measuring means for measuring a received intensity value of a radio signal received by the wireless receiving means and outputting the measured received intensity value;
When the second determination unit determines that the wireless signal includes a control start instruction, a plurality of reception intensity values included in the wireless signal received by the wireless reception unit and a predetermined value are included. Based on the combination information, the predetermined value corresponding to the received intensity value output from the measurement unit is recorded as a candidate value in a first storage unit, and the second determination unit controls the radio signal. If it is determined that a start instruction is not included, candidate value recording means for recording the standard candidate value stored in the third storage means in the first storage means;
Selecting means for selecting a random number value from a numerical value range in which the candidate value stored in the first storage means is a maximum value;
Means for transmitting a radio signal to the radio base station apparatus when the transmission instruction is input after the waiting time calculated based on the random value selected by the selection means has elapsed;
A wireless communication system comprising: A radio base station apparatus that performs transmission / reception using a radio signal and a radio base station apparatus that performs transmission / reception using a radio signal according to a transmission instruction input at an arbitrary time, and a predetermined value that increases as a reception intensity value and the reception intensity value increase. A wireless communication method in a wireless communication system, comprising: a second storage means for storing information of a plurality of combinations of the values of the values; and a wireless communication terminal provided with a third storage means for previously storing standard candidate values. And
The wireless base station device measuring the number of the wireless communication terminals in a communication standby state or in communication; and
Determining whether or not the radio base station device transmits a radio signal including a control start instruction based on the measured number of terminals and a preset threshold;
When the radio base station apparatus determines to transmit the control start instruction, a step of transmitting a radio signal including the control start instruction to the radio communication terminal;
The wireless communication terminal receiving a wireless signal transmitted from the wireless base station device;
The wireless communication terminal determines whether or not a control start instruction is included in a received wireless signal; and
The wireless communication terminal measures a received strength value of a received radio signal and outputs the measured received strength value;
When the wireless communication terminal determines that a control start instruction is included in the wireless signal, information on a plurality of combinations of reception intensity values and predetermined values stored in the second storage unit is included. Recording the predetermined value corresponding to the received intensity value measured based on the first storage means as a candidate value;
A step of recording the standard candidate value stored in the third storage means in the first storage means when the wireless communication terminal determines that the control start instruction is not included in the wireless signal; ,
The wireless communication terminal selecting a random value from a numerical value range in which the candidate value stored in the first storage means is a maximum value;
A step of transmitting a radio signal to the radio base station device when the transmission instruction is input after the elapse of a standby time calculated based on the random number value selected by the radio communication terminal;
A wireless communication method comprising: 4th memory which performs transmission / reception by a radio signal and stores information of a plurality of combinations including a reception intensity value of a radio signal received by the radio communication terminal and a predetermined value that increases as the reception intensity value increases Wireless communication provided with a wireless base station device provided with means and third storage means for performing transmission / reception with the wireless base station device according to a transmission instruction input at an arbitrary time by a wireless signal and storing a standard candidate value in advance A wireless communication method in a wireless communication system comprising a terminal,
The wireless base station device measuring the number of the wireless communication terminals in a communication standby state or in communication; and
Determining whether or not the radio base station device transmits a radio signal including a control start instruction based on the measured number of terminals and a preset threshold;
When it is determined that the radio base station apparatus transmits the control start instruction, information of a plurality of combinations including the reception intensity value and a predetermined value is read from the fourth storage unit, and the read information and the control Transmitting a wireless signal including a start instruction to the wireless communication terminal;
The wireless communication terminal receiving a wireless signal transmitted from the wireless base station device;
The wireless communication terminal determines whether or not a control start instruction is included in a received wireless signal; and
The wireless communication terminal measures a received strength value of a received radio signal and outputs the measured received strength value;
When the wireless communication terminal determines that the wireless signal includes a control start instruction, a plurality of combinations of reception intensity values and predetermined values included in the wireless signal received by the wireless reception unit Recording the predetermined value corresponding to the received intensity value measured based on the information as a candidate value in a first storage means;
When the wireless communication terminal determines that the second determination unit does not include a control start instruction in the wireless signal, the wireless communication terminal uses the standard candidate value stored in the third storage unit as the first candidate value. Recording in the storage means,
The wireless communication terminal selecting a random value from a numerical value range in which the candidate value stored in the first storage means is a maximum value;
When the transmission instruction is input after the waiting time calculated based on the random number value selected by the wireless communication terminal, the wireless base station device transmits a wireless signal to the wireless base station device. Transmitting a signal; and
A wireless communication method comprising: A computer of a radio communication terminal in a radio communication system, comprising: a radio base station apparatus that performs transmission / reception using a radio signal; and a radio communication terminal that performs transmission / reception using a radio signal according to a transmission instruction input at an arbitrary time The
Radio receiving means for receiving a radio signal transmitted from the radio base station device,
Measuring means for measuring a received intensity value of a radio signal received by the wireless receiving means and outputting the measured received intensity value;
The predetermined value corresponding to the received intensity value output from the measuring means is selected as a candidate value based on information of a plurality of combinations including a received intensity value and a predetermined value that increases as the received intensity value increases. Candidate value recording means for recording in the first storage means as
Selecting means for selecting a random number value from a numerical range in which the candidate value stored in the first storage means is a maximum value;
Radio transmission means for transmitting a radio signal to the radio base station apparatus when the transmission instruction is input after the elapse of a standby time calculated based on the random value selected by the selection means,
Computer program to function as. A computer of a radio base station apparatus in a radio communication system comprising: a radio base station apparatus that performs transmission / reception using a radio signal; and a radio communication terminal that performs transmission / reception using a radio signal with the radio base station apparatus;
Measuring means for measuring the number of the wireless communication terminals in communication standby state or in communication,
Control for starting control of the radio signal transmission interval of the radio communication terminal according to the reception intensity value on the radio communication terminal side based on the number of terminals measured by the measuring means and a preset threshold value Determining means for determining whether or not to transmit a radio signal including a start instruction;
A wireless transmission means for transmitting a wireless signal including the control start instruction to the wireless communication terminal when the determination means determines to transmit the control start instruction;
Computer program to function as. A radio base station apparatus that performs transmission / reception using a radio signal, a plurality of radio signal reception intensity values that are transmitted / received to / from the radio base station apparatus, and a predetermined value that increases as the reception intensity value increases A computer of a radio base station apparatus in a radio communication system comprising a radio communication terminal provided with a storage means for storing combination information;
Wireless transmission means for reading out information of a plurality of combinations consisting of the received intensity value and a predetermined value from the storage means, and transmitting a wireless signal including the read information to the wireless communication terminal;
Computer program to function as. The computer-readable recording medium which recorded the computer program in any one of Claims 12-14.

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