JP2012134600A - Transmission and reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission and reception device that can eradicate a reception error of a control channel and also prevent waste of transmission power and reduction of radio channel capacity.SOLUTION: A transmission and reception device controls transmission power of a partner device by comparing an SIR of a reception signal with a target SIR. A target SIR calculation unit 37 obtains a calculated SIR based on communication quality of the reception signal, and stores the calculated SIR, which is renewed as needed, to a calculated SIR storage unit 40. A required SIR storage unit 41 has stored the value of a required SIR necessary for reception of control data. When the control data is transmitted, a target SIR switching control unit 42 compares the calculated SIR with the required SIR, and if the relation is the calculated SIR≥the required SIR, the calculated SIR is set as the target SIR, and if the relation is the calculated SIR<the required SIR, the required SIR is set as the target SIR. If the control data has been completely received or if a certain time has elapsed, the renewed calculated SIR is set as the target SIR.

Description

  The present invention relates to a transmission / reception apparatus used in a W-CDMA (Wideband-Code Division Multiple Access) mobile communication system, and in particular, prevents control data reception errors and prevents radio channel capacity from being reduced due to excessive transmission power. The present invention relates to a transmitting / receiving device capable of

[Description of Prior Art]
In the W-CDMA mobile communication system, in order to increase the radio channel capacity, the transmission / reception apparatus performs transmission power control so that each channel is transmitted with as low power as possible.
Closed loop transmission power control is applied to a channel (for example, dedicated physical channel) in which upper and lower lines are used as a pair. The closed loop transmission power control is a process performed by the transmission power control circuit of the transmission / reception device, and is configured in two stages, an inner loop control and an outer loop control.

Here, closed loop transmission power control in a conventional transmission / reception apparatus will be described with reference to FIG. FIG. 6 is a schematic explanatory diagram of a transmission power control circuit in a conventional transmission / reception apparatus.
As shown in FIG. 6, the conventional transmission / reception apparatus includes a despreading unit 31, a rake receiving unit 32, and a transmission power control circuit 6 'as an SIR (Signal to Interference Ratio) measuring unit. 33, a comparison / determination unit 34, a TPCbit generation unit 35, a long interval quality measurement unit 36, a target SIR calculation unit 37, a target quality storage unit 38, and a target SIR storage unit 39.
Although not shown, a control unit that controls transmission power based on the received TPCbit is provided.

The despreading unit 31 performs despreading processing on the input received baseband signal and decodes it.
The Rake receiving unit 32 combines the multipath components obtained by despreading by adjusting the time.
The SIR measurement unit 33 measures the SIR of the combined received signal.
The target SIR storage unit 39 stores the target SIR value calculated by the outer loop so as to satisfy the target quality input from the outside.

The comparison determination unit 34 compares the SIR value of the received signal (reception SIR) with the target SIR value (target SIR) stored in the target SIR storage unit 39 to generate a command for controlling the transmission power of the communication partner. Is output.
Specifically, the comparison / determination unit 34 outputs an instruction to generate a Down command for reducing transmission power if reception SIR ≧ target SIR, and generates an Up command for increasing transmission power if reception SIR <target SIR. Output instructions.
The TPCbit generation unit 35 generates a Down command or an Up command in accordance with an instruction from the comparison determination unit 34, and outputs it to the modulation unit so as to be mapped to the transmission side control channel.

The long section quality measurement unit 36 measures communication quality such as BLER (Block Error Rate) in a long section (several hundred ms to several s) to some extent.
The target quality storage unit 38 stores communication quality (target quality) that is a preset target.
The target SIR calculation unit 37 compares the measured BLER with the target quality, calculates a target SIR that satisfies the target quality and suppresses transmission power as much as possible, and stores the target SIR in the target SIR storage unit 39.
Specifically, if the measured communication quality is better than the target quality (measurement BLER ≦ target quality error rate), the target SIR calculation unit 37 sets the target SIR by lowering it by a predetermined reduction amount, and performs measurement. If the transmitted communication quality is lower than the target quality (measurement BLER> target quality error rate), the target SIR is set to a predetermined increase.

[Inner loop control: Fig. 6]
The inner loop control operation will be described with reference to FIG.
The received baseband signal received at the receiving side device is despread by the despreading unit 31, Rake combined by the Rake receiving unit 32, and the SIR measuring unit 33 measures the SIR.
Then, the comparison / determination unit 34 compares the measured SIR with the target SIR in the target SIR storage unit 39 and outputs an instruction to generate a Down command if reception SIR ≧ target SIR, and reception SIR <target SIR. If so, an instruction to generate an Up command is output.

Then, the TPCbit generation unit 35 generates a Down command or an Up command according to the instruction, outputs it to the modulation unit (not shown), is mapped to the transmission side control channel, and is transmitted.
The transmission side apparatus receives and decodes the TPCbit, and controls to reduce the transmission power by 1 dB if the command is a Down command and to increase 1 dB if the command is an Up command.
In this way, inner loop control is performed.

[Outer loop control: Fig. 6]
Next, the outer loop control operation will be described with reference to FIG.
In the outer loop control, the receiving side apparatus controls the target SIR that serves as a reference for the inner loop control so that the communication quality (BLER) satisfies the set target value (target quality) and does not become excessive transmission power. .
Specifically, the long section quality measurement unit 36 measures the communication quality in a long section (several hundreds ms to several s) to some extent, and the target SIR calculation unit 37 stores the measured communication quality and the target quality storage unit 38. When the target quality is better than the target quality, the target SIR is calculated to be decreased. When the target quality is lower than the target quality, the target SIR is calculated to be increased. Store in the target SIR storage unit 39.

At this time, normally, the decrease width (Step Down Size) when lowering the target SIR is small, and the increase width (Step Up Size) when increasing the target SIR is set large.
Step Down Size = Step Up Size x Target BLER / (1-Target BLER)
By setting so as to satisfy the relationship, it is possible to bring the communication quality closer to the target quality.

[Target SIR and reception error: FIG. 7]
The target SIR set in the above outer loop control and the presence or absence of reception errors will be described with reference to FIG. FIG. 7 is a schematic explanatory diagram showing the relationship between the target SIR and the reception error.
As shown in FIG. 7, when the target SIR is high, there is no reception error and the communication quality is equal to or higher than the target quality. Therefore, the target SIR is gradually decreased by Step Down Size by outer loop control to reduce transmission power.

When the target SIR becomes lower than a certain level, a reception error occurs and the communication quality is lower than the target quality. Therefore, the target SIR is increased by Step Up Size.
Thus, in the outer loop control, the target SIR value is set so as to keep the transmission power as small as possible while keeping the communication quality at a certain level or higher.

[Traffic channel and control channel]
In the dedicated physical channel, a traffic channel for user data communication and a control channel for control data communication are multiplexed, and a target quality for outer loop control is set for each channel.

  In packet communication or the like, a certain amount of transmission delay is allowed, and even if there is an error in received data, it is possible to perform data retransmission until it can be received correctly. Therefore, a high quality of service (QoS) is not required in the traffic channel, and a relatively high error rate is set for the target quality (BLER) of the traffic channel, and a certain degree of reception error is allowed.

  On the other hand, since important control data that changes the state of the dedicated physical channel is also transmitted and received on the control channel, if reception fails, the state of the mobile station and the base station becomes inconsistent, causing a call disconnection Sometimes. Therefore, it is desirable that the control channel can be received without error, and a low error rate is set for the target quality (BLER) of the control channel.

In general, since the user data has a larger data amount than the control data, the outer loop control for the traffic channel is dominant in a situation where the traffic channel and the control channel are multiplexed.
That is, during packet data communication, the receiving side device controls the target SIR value so that the communication quality (BLER) of the traffic channel approaches the target value (target BLER) by outer loop control. Since the value is relatively high, the target SIR value is controlled to a low value.

  When control data is transmitted / received under such circumstances, the target SIR value controlled according to the target quality of the traffic channel on the receiving side may not satisfy the required quality for receiving the control channel without error. . As a result, control channel reception may fail.

[Transmission error when multiplexed: FIG. 8]
Next, the target SIR value and the presence / absence of a transmission error when the traffic channel and the control channel are multiplexed will be described with reference to FIG. FIG. 8 is a schematic explanatory diagram showing a target SIR value and presence / absence of a transmission error when a traffic channel and a control channel are multiplexed. However, in FIG. 8, for simplicity of explanation, it is assumed that the outer loop control is performed only for the traffic channel and is not performed for the control channel.
As shown in FIG. 8, when the outer loop control is performed only for the traffic channel, the target SIR value may be lower than the required SIR of the control channel. Even if the traffic channel can be received without error, a reception error occurs when the control channel is received. Will occur.

  In addition, if the target SIR value exceeds the quality required by the control channel in order to receive the control channel normally, the quality of the traffic channel with a large amount of data becomes higher than the target quality, and transmission power is wasted. As a result, the transmission capacity is reduced.

[Related technologies]
In addition, as a technique regarding transmission power control in the transmission / reception apparatus, there is JP-A-2005-15996 “Transmission power control method” (Applicant: Hitachi Kokusai Electric Inc., Patent Document 1).
Patent Document 1 measures the SIR of the signal from the opposite station, divides the absolute value of the difference between the received SIR and the reference quality into a plurality of stages, determines which stage the received SIR belongs to, and corresponds to that stage Thus, it is described that generation of a power control command for each unit cycle time reduces quality deterioration due to parasitic vibration caused by control delay.

JP 2005-159696 A

  However, in the conventional transmission / reception apparatus, if the target SIR value is set by outer loop control based on the traffic channel, a reception error occurs in the control channel. If the required SIR of the control channel is the target SIR value, the quality of the traffic channel However, there is a problem that it becomes unnecessarily good, requires more transmission power than necessary, and causes a reduction in radio channel capacity.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a transmission / reception device that can eliminate reception errors of a control channel, prevent waste of transmission power, and prevent a reduction in radio channel capacity. To do.

  The present invention for solving the problems of the above-described conventional example stores a target value of a set desired wave-to-interference wave power ratio, A transmission / reception device that measures and compares the measured value with a target value to control transmission power in the counterpart device, and calculates a target value candidate value based on the communication quality of the received signal A first storage unit that updates and stores the candidate values calculated by the target value calculation unit over time, and a desired wave-to-interference wave necessary for receiving control data for performing communication control without error A second storage unit that stores the value of the power ratio as a required value, and if control data is transmitted to the counterpart device, the candidate value stored in the first storage unit and the second storage unit If the candidate value is greater than or equal to the required value, the candidate value is If the candidate value is less than the required value, the required value is set as the target value. After a certain period of time has elapsed or when reception of control data from the counterpart device is completed, the first memory is stored. And a target value switching control unit for setting a candidate value updated and stored in the unit as a target value.

  According to the present invention, the target value of the set desired wave-to-interference wave power ratio is stored, the desired signal-to-interference wave power ratio of the received signal from the communication partner apparatus is measured, and the measured value, the target value, Is a transmission / reception device that controls transmission power in a counterpart device, and is calculated by a target value calculation unit that calculates a target value candidate value based on the communication quality of the received signal, and a target value calculation unit A first storage unit that updates and stores the candidate value as time passes, and stores a value of a desired wave to interference wave power ratio necessary to receive control data for performing communication control without error as a required value When the control data is transmitted to the second storage unit and the counterpart device, the candidate value stored in the first storage unit is compared with the required value stored in the second storage unit. If the candidate value is greater than or equal to the required value, set the candidate value as the target value and If it is less than the value, the required value is set as the target value, and after a certain period of time has elapsed or when reception of control data from the counterpart device is completed, it is updated and stored in the first storage unit. Since the transmitter / receiver includes a target value switching control unit that sets a candidate value as a target value, the target value of the desired wave to interference wave power ratio is required at a timing when the possibility of receiving control data from the counterpart device is high. It is possible to receive the control data without error by setting it to a value higher than the value, and to keep setting a higher target value more than necessary so as not to request excessive transmission power, thereby preventing a reduction in radio channel capacity. effective.

It is a block diagram of the configuration of a transmission / reception apparatus according to an embodiment of the present invention. It is a model explanatory drawing which shows the format of transmission data. It is explanatory drawing which shows the outline | summary of the outer loop control in this apparatus. It is a block diagram of the configuration of the transmission power control circuit 6 of the present apparatus. It is a flowchart of the target SIR switching control in the target SIR switching control unit of the present apparatus. It is a schematic explanatory drawing of the transmission power control circuit in the conventional transmission / reception apparatus. It is a schematic explanatory drawing which shows the relationship between target SIR and reception error. It is a schematic explanatory drawing which shows the target SIR value and the presence or absence of a transmission error when a traffic channel and a control channel are multiplexed.

[Outline of the embodiment]
Embodiments of the present invention will be described with reference to the drawings.
The transmission / reception apparatus according to the embodiment of the present invention includes a target SIR switching control unit that sets a target SIR serving as a reference for inner loop control, and the target SIR switching control unit is expected to receive control data from the opposite station. When the calculated SIR is less than the required SIR, the calculated SIR calculated by the normal (similar to the conventional) outer loop control is compared with the required SIR of the control channel. Temporarily raise the value to the required SIR or higher, set the calculated SIR as the target SIR after receiving the control data or after a lapse of a certain time from the raising, so that the control data can be received without error and the transmission power can be reduced. It is possible to reduce as much as possible and to prevent a reduction in line capacity.
The target SIR corresponds to the “target value” in the claims, the calculated SIR corresponds to the “candidate value” in the claims, and the required SIR corresponds to the “required value” in the claims.

[Configuration of Embodiment: FIG. 1]
A configuration of a transmitting / receiving apparatus (this apparatus) according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a configuration block diagram of a transmission / reception apparatus according to an embodiment of the present invention.
As shown in FIG. 1, the present apparatus includes a receiving unit 1, a despreading unit 2, a rake receiving unit 3, a demodulating unit 4, a decoding unit 5, a transmission power control circuit 6, and an encoding unit 7. A modulation unit 8 and a transmission unit 9 are provided.
Although not shown in the figure, a control unit that controls the entire apparatus is provided. The control unit controls transmission power in the transmission unit 9 based on a received and decoded TPC command, and transmits / receives control data. Is transmitted to the transmission power control circuit 6.

The receiving unit 1 receives a radio signal and converts it into a baseband signal.
The despreading unit 2 despreads the received baseband signal.
The Rake receiver 3 combines multipath components obtained by despreading.
The demodulator 4 performs demapping using a demodulation method corresponding to the modulation method on the transmission side.
The decoding unit 5 decodes the demodulated data to obtain received data.

The transmission power control circuit 6 performs closed loop transmission power control for controlling transmission power based on the received signal. The configuration and operation of the transmission power control circuit 6 will be described in detail later.
The encoding unit 7 encodes data to be transmitted by a predetermined encoding method.
The modulation unit 8 maps the encoded data and the TPCbit output from the transmission power control circuit 6 using a predetermined modulation method.
The transmission unit 9 transmits the modulated data with the transmission power specified by the control unit.

[Transmission data format: Fig. 2]
Next, the format of transmission data will be described with reference to FIG. FIG. 2 is a schematic explanatory diagram showing a format of transmission data.
As shown in FIG. 2, the transmission data of this apparatus is composed of a TPC bit (bit), a pilot symbol, and data.

[Outer loop control in this device: FIG. 3]
Next, the outline of the outer loop control in this apparatus will be described with reference to FIG. FIG. 3 is an explanatory diagram showing an outline of outer loop control in the present apparatus.
In this apparatus, the target SIR is raised to the required SIR level required by the control channel so that the control data can be received without error at the timing when the control channel is expected to be received from the opposite apparatus.
At the same time, in this device, while the target SIR is raised and set, processing for obtaining the calculated SIR is performed by outer control similar to the conventional one, and the calculated SIR is updated as needed to complete reception of the control channel. When the target SIR is raised or when a certain time has elapsed after the target SIR is raised, the target SIR is returned to the calculated SIR.

The timing of receiving the control data is generally unknown, but for example, when data is transmitted in the acknowledgment mode, the acknowledgment data (ACK / NACK) is returned from the partner station.
Depending on the control sequence procedure, a response message such as a completion report (Complete), confirmation (Confirm), and response (Response) may be returned from the partner station after a request control message (Request) is transmitted.

  This device utilizes the fact that control data returned from the partner station is likely to be received immediately after transmission of control data, so that the target SIR becomes equal to or higher than the required SIR of control data at the timing immediately after transmission of control data. It is intended to be controlled.

As shown in FIG. 3, in this apparatus, normally, the target SIR is controlled based on the reception result of the traffic channel as in the conventional case, and the SIR calculated by the outer loop control (“conventional target SIR” in the figure, Hereinafter, “calculated SIR” is set as the target SIR.
If there is no reception error in the traffic channel, the target SIR is gradually decreased by a predetermined decrease amount. If there is a reception error, the target SIR is set by increasing the predetermined increase amount.

Here, as a feature of the present apparatus, when control data is transmitted (indicated by “↑” in the figure), the calculated SIR at that time is not directly used as the target SIR, but the required SIR of the control channel stored in advance. And the calculated SIR are compared.
If the calculated SIR is equal to or greater than the required SIR of the control channel after transmitting the control data, the calculated SIR is set as the target SIR as in the conventional case.
On the other hand, if the calculated SIR is lower than the required SIR after transmitting the control data, the apparatus sets the stored required SIR as the target SIR.
As a result, after the control data is transmitted, if there is a control data response from the counterpart station, it can be received without error.

Further, in this apparatus, even when the target SIR value is temporarily increased, the process for obtaining the calculated SIR based on the traffic channel is continued, and when the control data is received from the partner station (reception is completed). Or when a certain time has elapsed after raising the target SIR, the target SIR is returned to the calculated SIR.
As a result, at the timing when reception of control data is not expected, the transmission power is not increased unnecessarily, and the reduction of the radio channel capacity can be prevented.

  The outer loop control when no control data is transmitted is the same as the conventional one, and the calculated SIR is set as the target SIR. That is, if there is no reception error in the traffic channel, the target SIR gradually decreases with a small decrease, but if there is a reception error, the target SIR is increased by a predetermined increase.

[Configuration of Transmission Power Control Circuit: FIG. 4]
Next, the configuration of the transmission power control circuit 6 of the present apparatus will be described with reference to FIG. FIG. 4 is a configuration block diagram of the transmission power control circuit 6 of the present apparatus.
As shown in FIG. 4, the transmission power control circuit 6 of this apparatus is similar to the conventional transmission power control circuit shown in FIG. 6, and includes an SIR measurement unit 33, a comparison determination unit 34, and a TPCbit generation unit 35. A long section quality measurement unit 36, a target SIR calculation unit 37, a target quality storage unit 38, and a target SIR storage unit 39, and a calculated SIR storage unit 40 and a required SIR storage unit as characteristic parts of this apparatus. 41 and a target SIR switching control unit 42.
About the part which attached | subjected the code | symbol same as the past, since a structure and operation | movement are the same, description is abbreviate | omitted.

The characteristic part of this apparatus is demonstrated.
The calculated SIR storage unit 40 stores the calculated SIR calculated by the target SIR calculation unit 37. The calculated SIR is equivalent to the target SIR calculated by the conventional outer loop control. The calculated SIR storage unit 40 corresponds to the first storage unit in the claims.
The required SIR storage unit 41 stores SIR values necessary for receiving control data without error. The required SIR storage unit 41 corresponds to the second storage unit in the claims.

  Further, the target SIR switching control unit 42 is a characteristic part of the present apparatus, and either the calculated SIR value stored in the calculated SIR storage unit 40 or the required SIR value stored in the required SIR storage unit 41. Is set in the target SIR storage unit 39 as the target SIR used in the inner loop control.

Specifically, the target SIR switching control unit 42 sets the calculated SIR normally stored in the calculated SIR storage unit 40 as the target SIR in the target SIR storage unit 39, but the control unit transmits that the control data has been transmitted. , The calculated SIR is compared with the required SIR stored in the required SIR storage unit 41.
Then, the target SIR switching control unit 42 sets the calculated SIR in the target SIR storage unit 39 if the calculated SIR ≧ the required SIR, and sets the required SIR in the target SIR storage unit 39 if the calculated SIR <the required SIR. To do.

  As a result, the target SIR can be made higher than the required SIR necessary for receiving the control data during the period when there is a high possibility of receiving the response control data from the partner station after transmitting the control data, and the control data is received without error. Is something that can be done.

[Operation of the apparatus: FIG. 4]
Next, the operation of this apparatus will be described with reference to FIG.
Since the operation of the inner loop is the same as the conventional one, the description is omitted.
The operation of the outer loop will be described.
In the target SIR calculation unit 37 of the present apparatus, the communication quality such as BLER measured by the long interval quality measurement unit 36 is compared with the target quality stored in the target quality storage unit 38 and measured as in the conventional case. If the transmitted communication quality is better than the target quality, the calculated SIR is lowered by a predetermined reduction amount and set in the calculated SIR storage unit 40. Further, if the measured communication quality is lower than the target quality, the calculated SIR is set by increasing by a predetermined increase amount.
The target SIR calculation unit 37 stores the calculated SIR value calculated by performing the calculation process as needed in the calculation SIR storage unit 40 and updates the calculation SIR storage unit 40 in advance.

  On the other hand, the required SIR is stored in the required SIR storage unit 41 as an SIR level necessary for receiving the control data by an external setting.

  Then, when the target SIR switching control unit 42 is notified of control data transmission from the control unit, the calculated SIR storage unit 40 is compared with the required SIR of the required SIR storage unit 41, and the calculated SIR ≧ If the required SIR, the calculated SIR is set in the target SIR storage unit 39. If the calculated SIR <the required SIR, the required SIR is set in the target SIR storage unit 39 and the target SIR is raised.

When the required SIR is set in the target SIR storage unit 39, the target SIR switching control unit 42 starts timer timing. The timer may be provided inside the target SIR switching control unit 42 or may be configured separately.
When the control unit notifies that the reception of the control data has been completed, the target SIR switching control unit 42 stops the timer and stores the calculated SIR stored in the calculated SIR storage unit 40 as the target SIR storage. Part 39.

  In addition, when a predetermined time has elapsed (timeout) after the timer timing starts, the possibility of receiving control data decreases, so the target SIR switching control unit 42 calculates the calculated SIR stored in the calculated SIR storage unit 40. Is set in the target SIR storage unit 39.

Here, during the period when the required SIR is set in the target SIR storage unit 39 and the control data is awaited, the target SIR is set sufficiently high, and there is usually no traffic data reception error, and the calculated SIR value is the target SIR. Since it is updated as needed by the SIR calculation unit 37, the calculated SIR when the time is up is lower than the value when the required SIR is set in the target SIR storage unit 39 (see FIG. 3).
As a result, only when the possibility of receiving control data is high, the target SIR is set high, and when the possibility of receiving control data is low, the transmission power is wasted and the radio power is wasted so that the target SIR is not high. It is possible to prevent the line capacity from being reduced.

[Control in Target SIR Switching Control Unit 42: FIG. 5]
Next, target SIR switching control in the target SIR switching control unit 42 of the present apparatus will be described with reference to FIG. FIG. 5 is a flowchart of target SIR switching control in the target SIR switching control unit 42 of the present apparatus.
As shown in FIG. 5, the target SIR switching control unit 42 monitors whether or not the control data transmission is notified from the control unit (100), and when the control data is not transmitted (normal state, (No ))), The calculated SIR stored in the calculated SIR storage unit 40 is set as the target SIR in the target SIR storage unit 39 (106), and the process ends.

  Further, when the control data transmission is notified in the process 100 (in the case of Yes), the calculated SIR stored in the calculated SIR storage unit 40 is compared with the required SIR stored in the required SIR storage unit 41. Then, it is determined whether or not the calculated SIR <the required SIR (102).

If the calculated SIR <the desired SIR is not satisfied (in the case of No), the target SIR switching control unit 42 sets the calculated SIR as the target SIR in the target SIR storage unit 39 (106) and ends the process.
If the calculated SIR <the required SIR in the process 102 (Yes), the target SIR switching control unit 42 sets the required SIR as the target SIR in the target SIR storage unit 39 (104).

  Then, the target SIR switching control unit 42 determines whether the control data reception completion is notified from the control unit (110), and if the control data reception completion is not notified (in the case of No), has the timer timed out? (112), and if it has not timed out, the process returns to processing 110 and waits for reception of control data.

In addition, when the reception of the control data is completed in the process 110 (Yes) or timed out in the process 112 (Yes), the target SIR switching control unit 42 is stored in the calculated SIR storage unit 40. The calculated SIR is set as the target SIR in the target SIR storage unit 39 (114), and the process is terminated.
In this way, the processing in the target SIR switching control unit 42 of the present apparatus is performed.

[Effect of the embodiment]
According to the transmission / reception apparatus according to the embodiment of the present invention, the target SIR calculation unit 37 obtains the calculated SIR based on the comparison result between the long-term communication quality and the target quality, stores the calculated SIR in the calculated SIR storage unit 40, The required SIR storage unit 41 stores the value of the required SIR input from the outside, and when the target SIR switching control unit 42 recognizes that the control data has been transmitted, the calculation stored in the calculation SIR storage unit 40 The SIR is compared with the required SIR stored in the required SIR storage unit 41. If the calculated SIR ≧ the required SIR, the calculated SIR is stored as the target SIR in the target SIR storage unit 39, and the calculated SIR <the required SIR. For example, the required SIR is stored in the target SIR storage unit 39 as the target SIR, and the transmission power is controlled by comparing the target SIR with the SIR of the received signal. The time zone of potential receipt of your data, control data and sets the target SIR or more required SIR can receive without error, there is an effect that it is possible to improve the reliability.

  Further, according to the transmission / reception apparatus according to the embodiment of the present invention, the target SIR calculation unit 37 continuously obtains the calculation SIR and updates the calculation SIR storage unit 40, and the target SIR switching control unit 42 When the required SIR is set as the target SIR, the calculated SIR is stored again in the target SIR storage unit 39 as the target SIR when the reception completion of the control data is recognized or when a predetermined time has elapsed since the setting of the required SIR. Therefore, the time to raise the target SIR is limited to the minimum necessary time zone where there is a possibility of receiving control data, and in other time zones, the target SIR is set higher than necessary to increase the excess transmission power. There is an effect that the wireless line capacity can be prevented from being reduced by not requesting it.

  INDUSTRIAL APPLICABILITY The present invention is suitable for a transmission / reception apparatus capable of preventing control data reception errors and preventing radio channel capacity from being reduced due to excessive transmission power.

  DESCRIPTION OF SYMBOLS 1 ... Reception part, 2 ... De-spreading part, 3 ... Rake reception part, 4 ... Demodulation part, 5 ... Decoding part, 6 ... Transmission power control circuit, 7 ... Encoding unit, 8 ... Modulation unit, 9 ... Transmission unit, 33 ... SIR measurement unit, 34 ... Comparison / determination unit, 35 ... TPCbit generation unit, 36 ... Long interval quality measurement , 37 ... target SIR calculation unit, 38 ... target quality storage unit, 39 ... target SIR storage unit, 40 ... calculation SIR storage unit, 41 ... required SIR storage unit, 42 .. .Target SIR switching control unit

Claims (1)

Store the target value of the set desired wave-to-interference wave power ratio, measure the desired wave-to-interference wave power ratio of the received signal from the communication partner device, and compare the measured value with the target value A transmission / reception device for controlling transmission power in the counterpart device,
A target value calculation unit that calculates a candidate value of the target value based on the communication quality of the received signal;
A first storage unit that updates and stores the candidate values calculated by the target value calculation unit over time;
A second storage unit that stores, as a required value, a value of a desired wave-to-interference wave power ratio necessary for receiving control data for performing communication control without error;
When the control data is transmitted to the counterpart device, the candidate value stored in the first storage unit is compared with the required value stored in the second storage unit, and the candidate value becomes the required value. If it is above, the candidate value is set as the target value, and if the candidate value is less than the required value, the required value is set as the target value. And a target value switching control unit that sets a candidate value that is updated and stored in the first storage unit as the target value when reception of the control data is completed. apparatus.

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