JP4429822B2 - Wireless communication apparatus and program thereof - Google Patents

Description

  The present invention relates to a radio communication apparatus in a radio communication system that controls a maximum transmission data rate of a radio communication apparatus based on an instruction from a base station and a predetermined random variable parameter.

  In a conventional EV-DO communication system based on CDMA 2000 1x EV-DO (Code Division Multiple Access 1x Evolution Data Only) that realizes a high-speed data communication network, the transmission power of each wireless communication device such as a mobile phone is set to another wireless communication device. Therefore, the maximum transmission data rate (maximum transmission rate) of each wireless communication apparatus is controlled by an instruction from the base station (the transmission power is controlled by controlling the transmission data rate (transmission rate)). ). The maximum transmission data rate of each wireless communication device is controlled by uplink channel activity (CombinedBusyBit: 0 or 1) given by the base station and random variable parameters (Transition009k6_019k2 to Transition153k2_076k8) (see FIG. 6).

The uplink channel activity is information that is periodically and individually given to each wireless communication device in a short period, and indicates whether it is better to increase or decrease the next transmission data rate of the wireless communication device. Is.
On the other hand, the random variable parameter is a constant value determined when a session between the wireless communication apparatus and the base station is established. The table regarding the determination of the maximum transmission data rate in the EV-DO communication system is shown below.

Here, it is assumed that the wireless communication apparatus transmits the previous transmission frame at 19.2 kbps (that is, CurrentRate = 19.2 kbps).
In this case, if the uplink channel activity given from the base station is “0” (that is, CombinedBusyBit = 0), the probability that the maximum transmission data rate can be increased from 19.2 kbps to 38.4 kbps is the random variable parameter Transition019k2_038k4. Indicated.

  On the other hand, the probability that the maximum transmission data rate remains 19.2 kbps is (1-Transition019k2_038k4). Similarly, when the uplink channel activity is “1” (that is, CombinedBusyBit = 1), the probability that the maximum transmission data rate should be reduced from 19.2 kbps to 9.6 kbps is indicated by Transition019k2 — 009k6 of the random variable parameter. On the other hand, the probability that the maximum transmission data rate remains 19.2 kbps is (1-Transition019k2_009k6).

Whether the wireless communication apparatus performs the maximum transmission data rate decrease determination or the maximum transmission data rate increase determination illustrated in FIG. 6 using the uplink channel activity and the random variable parameter, and determines whether to increase the maximum transmission data rate according to the determination result. Maintain or lower.
The following document discloses the CDMA 2000 1x EV-DO system.
JP 2003-143657 A

  In the conventional EV-DO communication system, as described above, the base station controls the maximum transmission data rate of the wireless communication apparatus using the uplink channel activity and the random variable parameter. When the variable parameter is given to each wireless communication device, the transmission data rate required by the communication application of each wireless communication device is not considered. This causes the following problems.

  For example, when the maximum transmission data rate of the wireless communication devices A and B is 19.2 kbps, the communication application of the wireless communication device A requires a transmission data rate of 9.6 kbps in the next transmission frame, and the communication of the wireless communication device B Consider the case where the application required a transmission data rate of 38.4 kbps in the next transmission frame. In both wireless communication apparatuses, when the uplink channel activity is “0” (CombinedBusyBit = 0), the maximum transmission data rate of the next transmission frame can be increased with the probability of Transition019k2_038k4.

  At this time, the maximum transmission data rate of the wireless communication apparatus A may increase to 38.4 kbps, and the maximum transmission data rate of the wireless communication apparatus B may remain at 19.2 kbps. In such a case, the wireless communication device A actually transmits the next transmission frame at 9.6 kbps, and the wireless communication device B transmits the next transmission frame at 19.2 kbps.

In this way, when the base station gives the uplink channel activity and the random variable parameters to each wireless communication device, the transmission data rate required by the communication application of each wireless communication device is not considered. As a result, there is a possibility that a low maximum transmission data rate may be given to a wireless communication apparatus that requires the above. In this case, the quality of service (QoS: Quality of Service) of the communication application of the wireless communication apparatus having a low maximum transmission data rate is significantly reduced.
That is, when the transmission data rate is determined in accordance with the instruction from the base station as in the conventional EV-DO communication system, there is a problem that the service quality of the communication application of the wireless communication apparatus may deteriorate.

  The present invention has been made in view of the above points, and the base station instructs to increase / decrease the maximum transmission data rate in order to control the transmission power of the wireless communication apparatus, and based on the instruction and a predetermined random variable parameter. In a wireless communication system in which a wireless communication device changes a transmission data rate stochastically, a wireless communication device capable of preventing deterioration in service quality of a communication application installed in the wireless communication device with respect to the transmission data rate, and a program thereof It is.

In order to solve the above-described problem, the radio communication apparatus according to the present invention, when instructed by the base station to increase the maximum transmission rate, determines whether or not to increase the maximum transmission data rate based on an increase determination threshold. If the current transmission rate is lower than the required transmission rate determined based on the amount of data stored in the transmission buffer or determined by the application, the increase determination by the increase determination unit is likely to succeed. And a means for raising the threshold value for the rise determination .

The wireless communication apparatus according to the present invention, when instructed to increase the maximum transmission rate from the base station , an increase determination means for determining whether to increase the maximum transmission data rate based on a threshold for determination of increase, If the transmission rate is higher than the transmission rate required based on the amount of data stored in the transmission buffer or determined by the application, the increase determination unit is configured to use the increase determination unit so that the increase determination by the increase determination unit is likely to fail. And a means for lowering the threshold value.

The wireless communication apparatus according to the present invention, when instructed to lower the maximum transmission rate from the base station, a lowering determination unit that determines whether to lower the maximum transmission rate based on a threshold for lowering determination, When the transmission rate is higher than the transmission rate required based on the amount of data stored in the transmission buffer or determined by the application, the threshold value of the descent determination unit is set so that the descent determination by the descent determination unit is easy to succeed. And a means for raising.

The wireless communication apparatus according to the present invention, when instructed to lower the maximum transmission rate from the base station, a lowering determination unit that determines whether to lower the maximum transmission rate based on a threshold for lowering determination, When the transmission rate is lower than the transmission rate required based on the amount of data stored in the transmission buffer or determined by the application, the threshold value of the lowering determination unit is set so that the lowering determination by the lowering determination unit is likely to fail. And a means for lowering.

The wireless communication apparatus according to the present invention, in the wireless communication apparatus that determines the change of the maximum transmission rate based on the generated random number and a threshold corresponding to the current transmission rate, an instruction indicating permission to increase the maximum transmission rate from the base station When the required transmission rate is determined based on the amount of data stored in the transmission buffer or determined by the application with respect to the current transmission rate, the maximum transmission rate is easily increased. The threshold value is changed as described above, and a change in the maximum transmission rate is determined based on the changed threshold value and a random number.

The wireless communication apparatus according to the present invention, in the wireless communication apparatus that determines the change of the maximum transmission rate based on the generated random number and a threshold corresponding to the current transmission rate, an instruction indicating permission to increase the maximum transmission rate from the base station When the transmission rate that is determined based on the amount of data stored in the transmission buffer or determined by the application is lower than the current transmission rate, the maximum transmission rate is difficult to increase. The threshold value is changed as described above, and a change in the maximum transmission rate is determined based on the changed threshold value and a random number.

The wireless communication device according to the present invention, in the wireless communication device that determines the change of the maximum transmission rate based on the generated random number and a threshold corresponding to the current transmission rate, an instruction indicating a decrease in the maximum transmission rate from the base station When receiving, if the required transmission rate determined based on the amount of data stored in the transmission buffer or determined by the application is lower than the current transmission rate, the maximum transmission rate is easily lowered. The threshold value is changed, and a change in the maximum transmission rate is determined based on the changed threshold value and a random number.

The wireless communication device according to the present invention, in the wireless communication device that determines the change of the maximum transmission rate based on the generated random number and a threshold corresponding to the current transmission rate, an instruction indicating a decrease in the maximum transmission rate from the base station When receiving, if the required transmission rate is determined based on the amount of data stored in the transmission buffer or determined by the application with respect to the current transmission rate, the maximum transmission rate becomes difficult to decrease. The threshold value is changed, and a change in the maximum transmission rate is determined based on the changed threshold value and a random number.

The program according to the present invention, when instructed by the base station to increase the maximum transmission rate, determines whether to increase the maximum transmission data rate based on a threshold for determining the increase, and the current transmission When the rate is lower than the transmission rate required based on the amount of data stored in the transmission buffer or determined by the application, the increase determination threshold is set so that the increase determination in the increase determination procedure is easy to succeed. It is a program for causing a computer to execute a procedure for increasing the speed.

The program according to the present invention, when instructed by the base station to increase the maximum transmission rate, determines whether to increase the maximum transmission data rate based on a threshold for determining the increase, and the current transmission If the rate is higher than the required transmission rate determined based on the amount of data stored in the transmission buffer or determined by the application, the increase determination threshold is set so that the increase determination in the increase determination procedure is likely to fail. It is a program for causing a computer to execute a lowering procedure.

The program according to the present invention, when instructed by the base station to lower the maximum transmission rate, determines whether or not to lower the maximum transmission rate based on a threshold for lowering determination, and the current transmission rate Is higher than the necessary transmission rate determined based on the amount of data stored in the transmission buffer or determined by the application, the threshold value for the lowering determination is increased so that the lowering determination in the lowering determination procedure is easy to succeed. It is a program for causing a computer to execute the procedure.

The program according to the present invention, when instructed by the base station to lower the maximum transmission rate, determines whether or not to lower the maximum transmission rate based on a threshold for lowering determination, and the current transmission rate Is lower than the transmission rate required based on the amount of data stored in the transmission buffer or determined by the application, the threshold value for the lowering determination is lowered so that the lowering determination in the lowering determination procedure is likely to fail. It is a program for causing a computer to execute the procedure.

  According to the present invention, the transmission data rate required by the communication application installed in the wireless communication device can be easily secured (increased probability of being secured) by the control in the wireless communication device. Service quality degradation can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a functional configuration of a wireless communication apparatus according to an embodiment of the present invention. Hereinafter, an EV-DO communication system that controls the maximum transmission data rate of the wireless communication apparatus based on an instruction from the base station and a predetermined random variable parameter will be described as an example.
In addition, the common code | symbol is attached | subjected to the common part.

The transmission data buffer 12 shown in the figure accumulates transmission data from all communication applications 11 that intend to transmit data according to the EV-DO protocol. Then, the accumulated transmission data is output to the following uplink traffic channel transmission data encoding unit 14.
The transmission buffer monitoring unit 13 monitors increase / decrease in the amount of data stored in the transmission data buffer 12 and calculates a necessary transmission data rate (ExpectedRate). This transmission data rate (ExpectedRate) is used in the maximum transmission data rate determination process (FIG. 3) described later.

  The uplink traffic channel transmission data encoding unit 14 selects an appropriate transmission data rate and encodes the transmission data passed from the transmission data buffer 12. The transmission data rate selected at this time must be lower than the maximum transmission data rate. The encoded transmission data is output to the uplink traffic channel transmission RF control unit 15 that controls the EV-DO RF circuit 16, and is further modulated and RF-transmitted by the EV-DO RF circuit 16.

The uplink traffic channel maximum transmission data rate determination unit 17 determines the maximum transmission data rate of the next transmission frame by a maximum transmission data rate determination process (FIG. 3) described later. The determined maximum transmission data rate is used as an element for selecting a transmission data rate in the uplink traffic channel transmission data encoding unit 14.
The maximum transmission data rate determination probability variable parameter storage unit 18 stores a random variable parameter used for the maximum transmission data rate increase determination or the decrease determination described later. As described above, this random variable parameter is normally given from the base station to the wireless communication apparatus 1 when a session is established with the base station.

  The downlink traffic channel data receiving unit (entire) 19 demodulates the received signal and decodes the demodulated received data. The uplink channel activity receiving unit 20 extracts the uplink channel activity from the decoded received data, and provides it to the uplink traffic channel maximum transmission data rate determining unit 17.

Note that the wireless communication device 1 of the present embodiment can be configured using hardware of a wireless communication device used in a conventional EV-DO communication system.
The transmission data buffer 12 and the maximum transmission data rate determination probability variable parameter storage unit 18 are included in a RAM (Random-Access Memory) built in the wireless communication apparatus 1, and the communication application 11 and other control programs are stored in ROM ( It is stored in a non-volatile storage device such as Read Only Memory).

The transmission buffer monitoring unit 13, the uplink traffic channel transmission data encoding unit 14, the uplink traffic channel transmission RF control unit 15, the uplink traffic channel maximum transmission data rate determination unit 17, the downlink traffic channel data reception unit (whole) 19, the uplink channel The activity receiving unit 20 and the determination failure number counter 21 of the second embodiment to be described later are realized by a processing unit (all not shown) including a memory, a DSP (digital signal processor), and the like. This processing unit is realized by loading a program (not shown) for realizing each function of each unit described above into a memory and executing it, or by executing a built-in microprogram And
The EV-DO RF circuit 16 is configured using a dedicated circuit that has been used conventionally.

  Here, FIG. 2 shows a functional configuration of a conventional wireless communication apparatus 1 ′. The wireless communication device 1 according to the present embodiment is different from the conventional wireless communication device 1 ′ in that the transmission buffer monitoring unit 13 is provided and the maximum transmission data described below is used in the uplink traffic channel maximum transmission data rate determination unit 17. The difference is that the rate determination process is executed.

Here, basic change control of the maximum transmission data rate will be described.
The wireless communication device 1 receives transmission data rate control based on uplink channel activity (CombinedBusyBit) received from the base station. When “0” is set for the uplink channel activity, the maximum transmission rate is allowed to be increased. When the uplink channel activity is “1”, the maximum transmission data rate is decreased. Then, the wireless communication device 1 determines that the relationship between the uplink channel activity, a threshold value corresponding to the current transmission data rate (CurrentRate) (hereinafter, random variable parameter), and the generated random number (x) satisfies the condition in Table 1. The maximum transmission data rate is changed or maintained based on whether it is met.

  The random number generation unit also serves as the configuration unit of FIG. In the following description, the determination of the change (increase or decrease) of the maximum transmission data rate based on the modified random variable parameter is the relationship between the random number and the modified random variable parameter corresponding to the current transmission data rate. For example, the determination of the change (increase or decrease) of the maximum transmission data rate based on whether or not the condition in Table 1 is satisfied will be omitted.

Next, the operation of the wireless communication device 1 will be described with reference to FIG.
The wireless communication device 1 receives uplink channel activity periodically transmitted from the base station (S101).
Each communication application 11 of the wireless communication apparatus 1 sends data to be transmitted to the transmission data buffer 12. The transmission buffer monitoring unit 13 calculates a necessary transmission data rate (ExpectedRate) from the current data accumulation amount of the transmission data buffer 12 and the transmission data increase rate (S102). This ExpectedRate can be calculated relatively easily. For example, ExpectedRate can be obtained by the following calculation formula (1). The required transmission data rate depends on the application and may be variable or fixed.

  When the uplink channel activity received last is “0” in the reception cycle of the uplink channel activity or the transmission start timing, it is determined whether the maximum transmission data rate is increased or decreased from the current transmission data rate (S103). . At this time, when the required transmission data rate (ExpectedRate) is higher than the current transmission data rate (CurrentRate) that is the current transmission data rate, the wireless communication device 1 increases the transmission data rate from the next transmission frame. The maximum transmission data rate increase determination is made easier to succeed. In order to increase the success rate of the maximum transmission data rate increase determination, the value of the increase determination random variable parameter, which has been constant in the past, is increased (S104).

  The increase correction method of the rising determination random variable parameter is difficult to obtain an optimal one because of the balance with other wireless communication devices, but can be obtained, for example, by the following calculation formula (2).

  According to this calculation formula, when the current transmission data rate is 9.6 kbps, the required transmission data rate is 19.2 kbps, and the random variable parameter Transition009k6_019k2 (TransitionPrm in the equation) is 0.5, the modified random variable parameter ( ModifiedTransitionPrm) in the formula is 0.75. This is equivalent to a two-fold increase in success rate.

  Further, the wireless communication device 1 determines that the maximum transmission data rate is increased so that the transmission data rate is less likely to increase in the next transmission frame when the necessary transmission data rate (ExpectedRate) is lower than the current transmission data rate (CurrentRate). Make it easier to fail. That is, in order to reduce the success rate of the maximum transmission data rate increase determination, the value of the increase determination random variable parameter is decreased (S105).

  As with the increase correction method described above, it is difficult to obtain the optimum correction method for the increase determination random variable parameter because there is a balance with other wireless communication devices, but the above equation (2) Can be used. According to this, when the current transmission data rate is 19.2 kbps, the necessary transmission data rate is 9.6 kbps, and the random variable parameter Transition009k6_019k2 is 0.5, the corrected random variable is 0.293. This is equivalent to halving the success rate of rising judgment.

As described above, the random variable parameter is corrected, and the maximum transmission data rate increase determination is performed based on the corrected random variable parameter (S106).
If the determination of the maximum transmission data rate increase is successful, the maximum transmission data rate becomes one step higher than the current transmission data rate (S107), and if it fails, the current transmission data rate remains the same (S108).

  On the other hand, when the uplink channel activity received last is “1” in the reception cycle or transmission start timing of the uplink channel activity, it is determined whether the maximum transmission data rate is lowered or increased from the current transmission data rate (S109). . At this time, when the required transmission data rate (ExpectedRate) is lower than the current transmission data rate (CurrentRate), the wireless communication device 1 determines to decrease the maximum transmission data rate in order to decrease the transmission data rate from the next transmission frame. Make it easier to succeed. In order to increase the success rate of the maximum transmission data rate decrease determination, the value of the decrease determination random variable parameter is increased (S110).

  The method for increasing the decrease determination random variable parameter, like the method for increasing the increase determination random variable parameter, is difficult to obtain the optimal because there is a balance with other wireless communication devices. The following calculation formula (3) can be used.

  According to this equation, when the current transmission data rate (CurrentRate) is 19.2 kbps, the necessary transmission data rate is 9.6 kbps, and the random variable Transition019k2_009k6 is 0.5, the corrected random variable is 0.75. This is equivalent to the fact that the success rate of the descent determination has doubled.

  Also, the wireless communication device 1 determines that the maximum transmission data rate is low so that the transmission data rate is less likely to decrease in the next transmission frame when the necessary transmission data rate (ExpectedRate) is higher than the current transmission data rate (CurrentRate). Make it easier to fail. That is, in order to lower the success rate of the maximum transmission data rate decrease determination, the value of the decrease determination random variable parameter is decreased (S111).

  As with the above-described increase correction method, it is difficult to obtain the optimum correction method for the decrease determination random variable parameter because there is a balance with other wireless communication devices, but the above equation (3) Can be used. According to this equation, when the current transmission data rate is 9.6 kbps, the necessary transmission data rate is 19.2 kbps, and the random variable Transition009k6_019k2 is 0.5, the corrected random variable is 0.293. This is equivalent to halving the success rate of the descent judgment.

As described above, the random variable parameter is corrected, and the maximum transmission data rate decrease determination is performed based on the corrected random variable parameter (S112).
If this maximum transmission data rate decrease determination is successful, the maximum transmission data rate is one step lower than the current transmission data rate (S113), and if it fails, the current transmission data rate remains the same (S108).
The wireless communication device 1 according to the present embodiment is configured and operates as described above.

  In the wireless communication device 1 of the above-described form, there is a problem when there are many such devices and data transmission is started at a high transmission data rate at the same time. In this case, each wireless communication device 1 ignores the instruction of the base station and tries to transmit at a high transmission data rate. However, since a number of transmission errors occur due to interference of transmission signals of other wireless communication devices 1, The transmission data rate is not improved. In such a case, useless power is consumed only for transmission at a high transmission data rate and high transmission power. That is, when each wireless communication device 1 operates on its own, the actual transmission data rate is reduced and the continuous communication time of all the wireless communication devices 1 is reduced.

  For example, when the transmission radio wave of each wireless communication device 1 is causing interference, the base station transmits an uplink channel activity “1” to the wireless communication device 1 causing the interference in order to reduce the interference. Send]. In the above-described maximum transmission data rate determination process shown in FIG. 3, when the communication application 11 requests a high transmission data rate, the maximum transmission data rate decrease determination is failed as a result. If the uplink channel activity “1” is substantially repeatedly ignored in this way, the interference control by the base station becomes invalid, and the above-described problem occurs.

A second embodiment for improving this problem will be described next.
FIG. 4 shows a functional configuration of the wireless communication apparatus 1 in this embodiment.
In the present embodiment, a determination failure frequency counter 21 that counts (counts) the number of failures in the maximum transmission data rate increase determination and the maximum transmission data rate decrease determination is further provided in the first embodiment.
The wireless communication apparatus 1 in the present embodiment operates as shown in the flowchart of FIG. The difference from the operation flow of the above-described embodiment is that steps S121 to S122 and steps S123 to S124 are added in the present embodiment.

  By configuring and operating in this way, every time the uplink channel activity “1” is ignored as a result, the maximum transmission data rate decrease determination is likely to be successful, and the uplink channel activity “0” is ignored as a result. Each time it is done, the maximum transmission data rate increase judgment is made easier to succeed. That is, the radio communication apparatus 1 according to the present embodiment operates in accordance with the instruction of the original base station every time the instruction due to the uplink channel activity is virtually ignored.

  Specifically, in the process of FIG. 5, when the number of failures counted by the determination failure number counter 21 is 0, the process shown in FIG. 3 is performed, but when the number of failures is 1 or more (here, , "1", but the criteria for this determination can be determined separately) was corrected based on the required transmission data rate (ExpectedRate) and the current transmission data rate (CurrentRate) in the processing of FIG. The random variable parameter is further modified (S122 or S124).

  Since the calculation formulas (2) and (3) change the threshold value (probability variable parameter) based on the current transmission data rate and the required transmission data rate, the change of the maximum transmission data rate is performed by the wireless communication apparatus 1. Depending on the application, there may be devices in the system that do not follow the control of the base station. Therefore, a calculation formula that incorporates into the calculation formulas (2) and (3) a change in the threshold value that depends on the control of the base station as shown in the following calculation formula (4) using the count value. If (5) and (6) are used, the rate required by the application of the wireless communication apparatus 1 and the rate that the base station wants to control can be kept in good balance.

As described above, the embodiment of the present invention has been described in detail. By configuring the wireless communication device as described above, the probability that transmission can be performed at the transmission data rate required by the communication application 11 installed in the wireless communication device is increased. Therefore, the quality of service (QoS) of the communication application 11 is improved. Further, in the second embodiment, an instruction based on uplink channel activity from the base station is not ignored, but depending on the number of failures of the maximum transmission data rate increase determination and the maximum transmission data rate decrease determination, the original base station Therefore, it is possible to prevent the interference control by the base station from becoming invalid.
Further, according to the present invention, it is not necessary to change the base station or the network connected thereto, and the effect is exhibited by using the wireless communication apparatus of the present invention in the conventional wireless communication system.

The operation flow of the wireless communication device 1 shown in FIGS. 3 and 5 is an example of the operation flow in each embodiment, and the present invention is not limited to the processing flow shown in each drawing.
In addition, a program for realizing the wireless communication device of the present invention is recorded on a computer-readable recording medium (for example, a memory), and the program recorded on the recording medium is used to control the wireless communication device. For example, the above-mentioned maximum transmission data rate may be controlled by being read and executed by a DSP.

The program can be provided by being recorded on a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, or a computer-readable recording medium such as a hard disk built in a computer system.
Further, it can be provided via a network such as the Internet or a communication line such as a telephone line. That is, the above program may be transmitted and installed in the wireless communication apparatus of the present invention from a computer system storing the program in a storage device or the like via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.

Further, the program may be a so-called difference file (difference program) that can realize the above-described function in combination with a program already recorded in the wireless communication apparatus.
The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes a configuration that does not depart from the gist of the present invention.

It is a block diagram which shows the function structure of the radio | wireless communication apparatus of the 1st Embodiment of this invention. It is a block diagram which shows the function structure of the conventional radio | wireless communication apparatus. 3 is a flowchart illustrating an operation (maximum transmission data rate determination process) of the wireless communication apparatus according to the first embodiment. It is a block diagram which shows the function structure of the radio | wireless communication apparatus of the 2nd Embodiment of this invention. 4 is a flowchart showing an operation (maximum transmission data rate determination process) of the wireless communication apparatus of the embodiment. It is a flowchart which shows the operation | movement (maximum transmission data rate determination process) of the conventional radio | wireless communication apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1 '... Wireless communication apparatus 11 ... Communication application 12 ... Transmission data buffer 13 ... Transmission buffer monitoring part 14 ... Up traffic channel transmission data encoding part 15 ... Up traffic channel transmission RF control part 16 ... EV-DO RF circuit 17 ... Uplink traffic channel maximum transmission data rate determination unit (upward determination means, each correction determination means, downward determination means, each correction means)
18 ... Maximum transmission data rate determination random variable parameter storage unit 19 ... Downlink traffic channel data reception unit (whole)
20 ... Uplink channel activity receiving unit 21 ... Determination failure frequency counter (counting means)

Claims (12)

An increase determination means for determining whether or not to increase the maximum transmission data rate based on a threshold for increase determination when instructed to increase the maximum transmission rate from the base station;
When the current transmission rate is lower than the transmission rate that is determined based on the amount of data stored in the transmission buffer or determined by the application, the increase determination means makes the increase determination easy to succeed. Means for raising the threshold of
A wireless communication apparatus comprising: An increase determination means for determining whether or not to increase the maximum transmission data rate based on a threshold for increase determination when instructed to increase the maximum transmission rate from the base station;
If the current transmission rate is higher than the necessary transmission rate determined based on the amount of data stored in the transmission buffer or determined by the application, the increase determination by the increase determination means is likely to fail. Means for lowering the threshold of
A wireless communication apparatus comprising: A lowering determination means for determining whether or not to lower the maximum transmission rate based on a threshold for lowering determination when the base station is instructed to lower the maximum transmission rate;
If the current transmission rate is higher than the transmission rate that is determined based on the amount of data stored in the transmission buffer or that is determined by the application, the descent determination unit is configured to make the descent determination by the descent determination unit easy to succeed. Means for raising the threshold of
A wireless communication apparatus comprising: A lowering determination means for determining whether or not to lower the maximum transmission rate based on a threshold for lowering determination when the base station is instructed to lower the maximum transmission rate;
If the current transmission rate is lower than the required transmission rate determined based on the amount of data stored in the transmission buffer or determined by the application, the descent determination by the descent determination means is likely to fail. Means for lowering the threshold of
A wireless communication apparatus comprising: In a wireless communication device that determines a change in the maximum transmission rate based on a generated random number and a threshold corresponding to the current transmission rate,
When receiving an instruction from the base station indicating permission to increase the maximum transmission rate, the transmission rate that is determined based on the amount of data stored in the transmission buffer or determined by the application is higher than the current transmission rate In this case, the wireless communication apparatus changes the threshold so that the maximum transmission rate can be easily increased , and determines a change in the maximum transmission rate based on the changed threshold and a random number. In a wireless communication device that determines a change in the maximum transmission rate based on a generated random number and a threshold corresponding to the current transmission rate,
When receiving an instruction from the base station indicating permission to increase the maximum transmission rate, the transmission rate that is determined based on the amount of data stored in the transmission buffer or determined by the application is lower than the current transmission rate In this case, the wireless communication apparatus changes the threshold value so that it is difficult to increase the maximum transmission rate, and determines a change in the maximum transmission rate based on the changed threshold value and a random number. In a wireless communication device that determines a change in the maximum transmission rate based on a generated random number and a threshold corresponding to the current transmission rate,
When an instruction indicating a decrease in the maximum transmission rate is received from the base station, the required transmission rate that is determined based on the amount of data stored in the transmission buffer or determined by the application is lower than the current transmission rate A wireless communication apparatus that changes the threshold so that the maximum transmission rate can be easily lowered, and determines a change in the maximum transmission rate based on the changed threshold and a random number. In a wireless communication device that determines a change in the maximum transmission rate based on a generated random number and a threshold corresponding to the current transmission rate,
When an instruction indicating a decrease in the maximum transmission rate is received from the base station, the transmission rate that is determined based on the amount of data stored in the transmission buffer or determined by the application is higher than the current transmission rate A wireless communication apparatus that changes the threshold so that the maximum transmission rate is difficult to decrease, and determines a change in the maximum transmission rate based on the changed threshold and a random number. An increase determination procedure for determining whether or not to increase the maximum transmission data rate based on a threshold for increase determination when instructed by the base station to increase the maximum transmission rate;
If the current transmission rate is lower than the required transmission rate determined based on the amount of data stored in the transmission buffer or determined by the application, the increase determination in the increase determination procedure is likely to succeed. To increase the threshold of
A program that causes a computer to execute. An increase determination procedure for determining whether or not to increase the maximum transmission data rate based on a threshold for increase determination when instructed by the base station to increase the maximum transmission rate;
If the current transmission rate is higher than the required transmission rate determined based on the amount of data stored in the transmission buffer or determined by the application, the increase determination in the increase determination procedure is likely to fail. To lower the threshold of
A program that causes a computer to execute. A lowering determination procedure for determining whether or not to lower the maximum transmission rate based on a threshold for lowering determination when the base station is instructed to lower the maximum transmission rate;
If the current transmission rate is higher than the required transmission rate determined based on the amount of data stored in the transmission buffer or determined by the application, the downward determination is performed so that the downward determination in the downward determination procedure is likely to be successful. To increase the threshold of
A program that causes a computer to execute. A lowering determination procedure for determining whether or not to lower the maximum transmission rate based on a threshold for lowering determination when the base station is instructed to lower the maximum transmission rate;
If the current transmission rate is lower than the transmission rate that is determined based on the amount of data stored in the transmission buffer or that is determined by the application, the descent determination in the descent determination procedure is likely to fail. To lower the threshold of
A program that causes a computer to execute.

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