JP5413145B2 - Mobile terminal device - Google Patents

Description

  The present invention relates to a portable terminal device that performs transmission power control of a dedicated physical channel (DPCH).

  The DPCH transmission power is controlled so that the minimum power that can ensure the necessary communication quality between the base station and the mobile terminal device can be delivered without excess or deficiency. This transmission power control measures the signal power to interference power ratio (SIR) of the received signal, compares the SIR with the SIR target value in the base station, and makes the SIR approach the SIR target value. The transmission side is requested to increase or decrease the power by a predetermined step by using a transmission power control (TPC) bit. Such transmission power control is called an inner loop or a closed loop.

  FIG. 2 is a diagram illustrating DPCH transmission power control. FIG. 3 is a diagram for explaining the data format of the uplink DPCH. FIG. 4 is a diagram for explaining a bit pattern of TPC. The 3rd generation mobile communication system standardization project (3GPP: 3rd Generation Partnership Project) terminal closed loop power control (Closed Loop POWER control) will be described with reference to FIGS.

  As shown in FIG. 2, in 3GPP, a base station (BTS: Base Transceiver Station) performs DPCH transmission power control for each mobile terminal device (UE: User Equipment) using TPC. The TPC bit is defined in the dedicated control channel (DCCH) of the uplink (UL: Up Link) and the downlink (DL: Down Link), and is transmitted and received by each BTS and UE. FIG. 2 is a diagram in which downlink DPCH quality (SIR) is observed and transmission power of the BTS downlink DPCH is controlled by the uplink TPC bits. A is the downlink and B is the uplink. The UE measures the SIR of the downlink DPCH. For example, the UE compares the SIR target value notified from the BTS with the measured SIR, and determines whether the transmission power of the downlink DPCH is increased or decreased. And UE transmits the TPC bit which instruct | indicates increase or reduction of transmission power to BTS using an uplink. The BTS receives the TPC bit and changes the downlink DPCH transmission power accordingly.

  FIG. 2 illustrates an example in which the UE controls downlink DPCH transmission power from the BTS, but the same applies when the BTS controls uplink DPCH transmission power from the UE. That is, the BTS measures the SIR of the uplink DPCH. The BTS compares the SIR target value with the measured SIR to determine whether the uplink DPCH transmission power is increased or decreased. Then, the BTS transmits a TPC bit instructing increase or decrease in transmission power to the UE using the downlink. The UE receives the TPC bit and changes the uplink DPCH transmit power accordingly.

  As shown in FIG. 3, the DPCH is a 10 mS radio frame divided into 15 slots, each consisting of a dedicated physical control channel (DPCCH) and a dedicated physical data channel (DPDCH). Is a channel for transmitting data of a link layer or higher.

  DPCCH is a channel for transmitting DPCH control information, and transmission format information (TFCI: Transport Format Combination Indicator) bits for notifying a combination of data units, and a pilot signal (Pilot Bit) that is information for synchronizing timing. ), Feedback information (FBI: Feedback information), and TPC bits.

  For example, as shown in FIG. 4, the TPC bit is defined as 11 transmissions (= 1 dBUp request) requesting an increase in transmission power and 00 transmissions (= 1 dBDown request) requesting a reduction in transmission power.

  As described above, in the closed loop power control in the 3GPP mobile terminal device, the DPCCH is used to control the other party's DPCH transmission power so as to obtain the transmission power desired by both the BTS and the UE.

Next, SIR that is a reference for transmission power control will be described. SIR is defined as:
(Formula 1)
SIR = (RSCP / ISCP) * SF
Here, RSCP (Received Signal Code Power) is the power of DPCH that can be extracted by despreading, and ISCP (Interference Signal Code Power) is the interference power for DPCH. SF (Spreading Factor) is the number of spreading chips used in the DPCCH.

  The SIR calculation is performed in the pilot portion of the DPCH where the expected data pattern is known in advance. That is, the SIR variation factors are the DPCH received power amount (RSCP) and the DPCH interference component amount (ISCP). Based on this ratio, the closed channel is used to converge to the desired communication quality. Specifically, the closed loop controls the RPC to be increased by requesting an increase in DPCH transmission power with the TPC bit if the SIR is poor (if low) with respect to the target value. If it is good (if it is high), request a reduction in DPCH transmission power with the TPC bit and control the RSCP to be low. The SIR is converged to the target value.

  Other examples of transmission power control are described in Patent Documents 1 to 3. The transmission power control method disclosed in Patent Document 1 considers the reception power of a common pilot channel (CPICH). Specifically, the mobile station estimates the difference in propagation loss from the base station from the measurement result of the reception quality of CPICH transmitted by the base station at a predetermined transmission power, and the offset power determined according to the difference. Only the transmission power of the uplink DPCH is added.

  The transmission power control method of Patent Document 2 controls the transmission power of the common channel.

  In the transmission power control method of Patent Document 3, the SIR target value that is the reference for DPCH transmission power control is changed. The method of transmission power control of Patent Document 3 determines the reception quality of CPICH, changes the SIR target value, and controls the transmission power of the DPCH on the transmission side so that the changed SIR target value is obtained.

JP 2004-080235 A JP 2004-215305 A JP 2006-319462 A

  Next, it will be described that the transmission power of the DPCH may not be appropriately controlled depending on the timing of other channels other than the DPCH. FIG. 5 is a diagram for explaining the DPCH format on the downlink side. The format is slightly different from that on the uplink side, and DPDCH / DPCCH are on the same phase and mapped on the time axis. The pilot bit is at the end of the format. FIG. 6 is an example of the timing of another channel having interference (with correlation) with the DPCH on the downlink side in FIG. In this example, a channel with interference is set at a DPCH communication timing other than pilot bits.

  FIG. 7 is a flowchart for explaining that the transmission power decreases and DPCH data reception becomes impossible. RSCP and ISCP which are the basis of SIR calculation are calculated in the pilot part of DPCH. In the example of FIG. 6, since there is no interfering component in the pilot portion, a good calculation result is obtained for the SIR. In particular, in a good communication environment where BTS and UE with little electric path propagation are close, the SIR becomes high (RSCP> ISCP), and UE makes a request for reducing DPCH transmission power using uplink TPC bits (7-2). Here, when interference due to other channels as shown in FIG. 6 occurs, if the DPCH transmission power is reduced by control using SIR, the DPDCH portion in which the data of the link layer or higher is contained is data due to interference. Reception becomes impossible (7-3). As a result, the data communication is not established despite the good communication environment, and the communication is interrupted.

  In addition, since the transmission power control method disclosed in Patent Document 3 checks the SIR and changes the SIR target value, depending on the timing of other channels, avoiding data communication not being established as described above and communication interruption being avoided. There was a problem that it was not possible.

  The transmission power control method of Patent Document 1 can increase the DPCH transmission power when it interferes with other channels, but avoids communication interruption when reducing the DPCH transmission power in the case shown in FIG. There was a problem that it was not possible.

  Therefore, an object of the present invention is to provide a portable terminal device that can avoid communication interruption regardless of the timing at which interference between the DPCH and another channel, which is the above-described problem, occurs.

  The mobile terminal device according to the present invention measures the SIR of the DPCH received signal, compares the SIR with the SIR target value in the base station, and uses the TPC bit so that the SIR approaches the SIR target value. Closed loop means for adjusting the DPCH transmission power of the base station, and if the SIR is higher than the SIR target value, confirm the interference between the common channel and the DPCH on the reception power of the common channel and the DPCH format, A common channel confirmation means for causing the closed-loop means to stop transmission of a TPC bit that lowers the DPCH transmission power of the base station when the interference occurs and the reception power of the common channel is lower than a predetermined value; Prepare.

  The base station according to the present invention measures the SIR of the received signal on the DPCH, compares the SIR with the SIR target value, and uses the TPC bit so that the SIR approaches the SIR target value. Closed loop means for adjusting transmission power, and if the SIR is higher than the SIR target value, check the interference between the common channel and the DPCH on the reception power of the common channel and the format of the DPCH, and cause the interference. And, when the reception power of the common channel is lower than a predetermined value, common channel confirmation means for stopping the TPC bit transmission for lowering the DPCH transmission power of the portable terminal device to the closed loop means.

  The radio | wireless communications system which concerns on this invention has the said portable terminal device and the said base station.

  The base station transmission power control method according to the present invention measures the SIR of the DPCH received signal, compares the SIR with the SIR target value in the base station, and sets the TPC bit so that the SIR approaches the SIR target value. A closed-loop procedure for adjusting the DPCH transmission power of the base station using the IF, and if the SIR is higher than the SIR target value, interference between the common channel and the DPCH on the reception power of the common channel and the format of the DPCH And a common channel confirmation procedure for stopping transmission of the TPC bit that lowers the DPCH transmission power of the base station when the interference occurs and the reception power of the common channel is lower than a predetermined value.

  The transmission power control method of the mobile terminal device according to the present invention measures the SIR of the DPCH received signal, compares the SIR with the SIR target value, and uses the TPC bit so that the SIR approaches the SIR target value. To check the interference between the common channel and the DPCH on the received power of the common channel and the DPCH format if the SIR is higher than the SIR target value. And a common channel confirmation procedure for stopping transmission of a TPC bit that lowers the DPCH transmission power of the mobile terminal device when the interference occurs and the reception power of the common channel is lower than a predetermined value.

  A transmission power control method for a wireless communication system according to the present invention includes the transmission power control method for the base station and the transmission power control method for the mobile terminal device.

  The transmission power control program according to the present invention measures the SIR of the DPCH received signal, compares the SIR with the SIR target value in the base station, and uses the TPC bit so that the SIR approaches the SIR target value. Closed loop procedure for adjusting the DPCH transmission power of the base station, and if the SIR is higher than the SIR target value, confirm the interference between the common channel and the DPCH on the common channel reception power and the DPCH format. , Causing the mobile terminal device to implement a common channel confirmation procedure for stopping transmission of a TPC bit that lowers the DPCH transmission power of the base station when the interference occurs and the reception power of the common channel is lower than a predetermined value. .

  The transmission power control program according to the present invention measures the SIR of the DPCH received signal, compares the SIR with the SIR target value, and uses the TPC bit so that the SIR approaches the SIR target value. A closed loop procedure for adjusting the DPCH transmission power of the communication channel, and if the SIR is higher than the SIR target value, confirm the interference between the common channel and the DPCH on the reception power of the common channel and the format of the DPCH, and the interference When the reception power of the common channel is lower than a predetermined value, the base station is made to realize a common channel confirmation procedure for stopping the transmission of the TPC bit that lowers the DPCH transmission power of the mobile terminal device.

  The present invention can provide a mobile terminal device capable of avoiding communication disconnection regardless of the timing at which interference between DPCH and other channels occurs.

It is a figure explaining the portable terminal device which concerns on this invention. It is a figure explaining the transmission power control of DPCH. It is a figure explaining the data format of uplink DPCH. It is a figure explaining the bit pattern of TPC. It is a figure explaining the DPCH format by the side of a downlink. It is a figure explaining the position of downlink DPCH and other channels. It is a flowchart explaining that transmission power falls and cannot receive data of DPCH. It is a figure explaining the communication timing of each channel in 3GPP. It is a flowchart explaining the transmission power control method which concerns on this invention. It is a figure explaining estimating DPCH reception impossible area. It is a figure explaining the radio | wireless communications system which concerns on this invention.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In the present specification and drawings, the same reference numerals denote the same components.

  FIG. 11 is a diagram illustrating the wireless communication system according to the present embodiment. The wireless communication system includes a base station 10 and a mobile terminal device 20. For example, this wireless system is a system compatible with 3GPP. The mobile terminal device 20 is a device compatible with 3GPP. For example, the mobile terminal device 20 is a mobile phone, a portable information terminal, a household appliance, or an industrial appliance.

  FIG. 1 is a configuration diagram illustrating a configuration example when the mobile terminal device 20 is a mobile phone. 1 includes a display unit 1-1, a key operation unit 1-2, a CPU (Central Processing Unit) 1-3, a storage unit 1-4, a radio unit 1-5, and an antenna unit 1-6. . The display unit 1-1 notifies the user of the operation of the mobile phone, the communication state, and the like. The key operation unit 1-2 allows the user to perform operations such as outgoing and incoming calls of the mobile phone. The CPU unit 1-3 recognizes an input from the key operation unit 1-2, controls the display unit 1-1, and transmits / receives data to / from the wireless unit 1-5 and state control. The storage unit 1-4 temporarily holds data when the CPU 1-3 operates, and stores user settings of the mobile phone. The radio unit 1-5 and the antenna unit 1-6 transmit and receive radio waves for communication.

  The mobile terminal device 20 measures the SIR of the DPCH received signal, compares the SIR with the SIR target value 13 in the base station 10, and uses the TPC bit so that the SIR approaches the SIR target value 13. Closed loop means 21 for adjusting the transmission power of the station 10, and if the SIR is higher than the SIR target value 13, confirm the interference between the common channel and the DPCH on the reception power of the common channel and the format of the DPCH, A common channel confirmation unit 22 for causing the closed loop unit 21 to stop transmission of a TPC bit that lowers the transmission power of the base station 10 when the interference occurs and the reception power of the common channel is lower than a predetermined value; Prepare.

  The mobile terminal device 20 controls the DPCH transmission power from the base station 10 by the following transmission power control method. This transmission power control method measures the SIR of the DPCH received signal, compares the SIR with the SIR target value 13 in the base station 10, and uses the TPC bit so that the SIR approaches the SIR target value 13. Closed loop procedure for adjusting the transmission power of the base station 10 and, if the SIR is higher than the SIR target value 13, confirm the interference between the common channel and the DPCH on the reception power of the common channel and the format of the DPCH, A common channel confirmation procedure for stopping transmission of a TPC bit that lowers the transmission power of the base station 10 when the interference occurs and the reception power of the common channel is lower than a predetermined value.

  The portable terminal device 20 performs the transmission power control method by executing the following transmission power control program. This program measures the SIR of the DPCH received signal, compares the SIR with the SIR target value 13 in the base station 10, and uses the TPC bit so that the SIR approaches the SIR target value 13. If the SIR is higher than the SIR target value 13, the interference between the common channel and the DPCH is confirmed on the received power of the common channel and the format of the DPCH, and the interference is reduced. A transmission power control program for causing the mobile terminal device 20 to realize a common channel confirmation procedure for stopping transmission of a TPC bit that lowers the transmission power of the base station 10 when the reception power of the common channel is lower than a predetermined value. It is. For example, the storage unit 1-4 stores the transmission power control program, and the CPU 1-3 reads and executes the transmission power control program from the storage unit 1-4, so that the mobile terminal device 20 performs the transmission power control. The method can be done.

  When the mobile terminal device 20 attempts to reduce the transmission power of the DPCH with respect to the base station 10, the TPC bit is determined in consideration of not only the determination result of the SIR but also the reception power of the common channel.

  On the other hand, the base station 10 measures the SIR of the DPCH received signal, compares the SIR with the SIR target value 13, and uses the TPC bit so that the SIR approaches the SIR target value 13. Closed loop means 11 for adjusting the transmission power, and if the SIR is higher than the SIR target value 13, check the interference between the common channel and the DPCH on the reception power of the common channel and the format of the DPCH. And a common channel confirmation unit 12 that causes the closed loop unit 11 to stop transmitting the TPC bit that lowers the transmission power of the mobile terminal device 20 when the reception power of the common channel is lower than a predetermined value.

  The base station 10 controls the DPCH transmission power from the mobile terminal device 20 by the following transmission power control method. This transmission power control method measures the SIR of the DPCH received signal, compares the SIR with the SIR target value 13, and uses the TPC bit so that the SIR approaches the SIR target value 13. If a closed loop procedure for adjusting transmission power and the SIR is higher than the SIR target value 13, the interference between the common channel and the DPCH is confirmed on the reception power of the common channel and the format of the DPCH, and the interference occurs. And a common channel confirmation procedure for stopping transmission of a TPC bit that lowers the transmission power of the mobile terminal device 20 when the reception power of the common channel is lower than a predetermined value.

  The base station 10 performs the transmission power control method by executing the following transmission power control program. This program measures the SIR of the DPCH received signal, compares the SIR with the SIR target value 13, and uses the TPC bit so that the SIR approaches the SIR target value 13. Closed-loop procedure to adjust, and if the SIR is higher than the SIR target value 13, confirm the interference between the common channel and the DPCH on the reception power of the common channel and the format of the DPCH, and cause the interference, and This is a transmission power control program for causing the base station 10 to implement a common channel confirmation procedure for stopping transmission of a TPC bit that lowers the transmission power of the mobile terminal device 20 when the reception power of the common channel is lower than a predetermined value. For example, the storage unit of the base station 10 stores the transmission power control program, and the CPU of the base station 10 reads and executes the transmission power control program from the storage unit, whereby the base station 10 performs the transmission power control program. The method can be done.

  When the base station 10 attempts to reduce the DPCH transmission power to the mobile terminal device 20, the base station 10 considers not only the SIR determination result but also the reception power of the common channel, and determines the TPC bit.

  The common channel for confirming reception power and interference can be, for example, CPICH. CPICH is a reference channel that is broadcast to mobile terminals that are in the area, and unlike the DPCH, the transmission power from the base station does not increase or decrease. In 3GPP, communication is possible with offset from the reference timing of some individual communication channels, but most communication channels communicate at the same timing as CPICH. FIG. 8 shows the timing chart. In the channel shown in FIG. 8, τ can be offset from the reference timing. For example, the timing of DPCH can be adjusted on the base station side for each UE. Depending on this timing, the DPCH receives interference from a common channel including the CPICH on the reference timing as described with reference to FIG. When the DPCH and the common channel interfere as shown in FIG. 6, not only the DPCH but also the received power of the common channel is reduced.

  Therefore, the base station 10 and the mobile terminal device 20 confirm the interference between the common channel and the DPCH on the common channel reception power and the DPCH format by the common channel confirmation unit 12 and the common channel confirmation unit 22, respectively. For example, when the common channel confirmed by the common channel confirming unit 12 and the common channel confirming unit 22 is CPICH, the common channel confirming unit 12 and the common channel confirming unit 22 receive the CPICH received signal after despreading (CPICH-RSCP: CPICH). -Confirm Received Signal Code Power).

  FIG. 9 is a flowchart for explaining a transmission power control method performed by the base station 10 and the mobile terminal device 20. Assume that the SIR rises during communication between the base station 10 and the mobile terminal device 20 (step 9-1). The closed loop means (11, 21) determines that the measured SIR is good with respect to the SIR target value 13 of the base station 10 (step 9-3). In this case, the common channel confirmation means (12, 22) determines timing interference from the common channel and the DPCH timing offset and format (step 9-4). Here, if there is no interference, the common channel confirmation means (12, 22) causes the closed loop means (11, 21) to transmit a TPC bit for requesting a reduction in DPCH transmission power to the transmission side (step 9-6). ).

  On the other hand, when the common channel confirmation means (12, 22) determines that there is interference between the common channel and the DPCH, it confirms the reception power (CPICH-RSCP) of the common channel (step 9-2), and CPICH-RSCP. And a predetermined value set in advance (step 9-5). For example, the predetermined value is set based on the wireless sensitivity of the base station 10 or the mobile terminal device 20. When the common channel confirmation unit (12, 22) determines that the DPCH-RSCP is in the DPCH receivable region of FIG. 10 described later as a result of the comparison between the CPICH-RSCP and the predetermined value, the closed loop unit (11 , 21) transmits a TPC bit requesting a reduction in DPCH transmission power to the transmission side (step 9-6). On the other hand, when the common channel confirmation means (12, 22) determines that DPCH-RSCP is not in the DPCH receivable area as a result of comparison between CPICH-RSCP and a predetermined value, the closed loop means (11, 21) Suppressing transmission of a TPC bit requesting a reduction in transmission power to the transmission side (step 9-7).

  When the base station 10 and the mobile terminal device 20 perform the transmission power control method of FIG. 9, the wireless communication system of FIG. 11 is set to the communication timing at which DPCH interferes with the common channel, and the base station 10 In a communication environment in which the mobile terminal device 20 is near and there is little deterioration in radio quality, closed loop control can reduce the DPCH transmission power too much and avoid an event that causes communication interruption due to inability to receive DPCH. Therefore, the base station 10, the mobile terminal device 20, and the wireless communication system having these according to the present embodiment can avoid communication disconnection at any timing when interference between the DPCH and another channel occurs.

  The above is a description of the mobile terminal device, base station, radio communication system, mobile terminal device transmission power control method, base station transmission power control method, radio communication system transmission power control method, and transmission power control program according to the present invention. It is explained that the object of the present invention can be achieved with a minimum configuration. Next, a mobile terminal device, a base station, a radio communication system, a mobile terminal device transmission power control method, a base station transmission power control method, a radio communication system transmission power control method, and a transmission power control program according to the present invention A preferred embodiment will be described.

  The common channel confirmation unit 22 can estimate a DPCH receivable region in which the mobile terminal device 20 can receive the DPCH based on the reception power of the common channel. Further, the common channel confirmation unit 12 can estimate a DPCH receivable region in which the base station 10 can receive the DPCH based on the reception power of the common channel.

  FIG. 10 is a diagram for explaining estimation of a DPCH unreceivable region of reception power at which DPCH cannot be received based on the reception power of the common channel. The common channel confirmation means (12, 22) estimates the DPCH unreceivable area from the reception power of the common channel. For example, the common channel confirmation means (12, 22) may estimate the DPCH unreceivable area based on the radio sensitivity. The common channel confirmation means (12, 22) may estimate the DPCH unreceivable region based on the DPCH error rate obtained from the power ratio (energy ratio) between CPICH and DPCH. The base station 10 and the mobile terminal device 20 estimate the DPCH receivable area from the DPCH unreceivable area.

  The common channel confirmation unit 22 reduces the DPCH transmission power of the base station 10 to the lowest value in the DPCH receivable area when the SIR is higher than the SIR target value 13 and the reception power of the common channel is higher than the predetermined value. It is preferable to transmit the TPC bit. Further, the common channel confirmation unit 12 performs DPCH transmission of the portable terminal device 20 to the lowest value of the DPCH receivable area when the SIR is higher than the SIR target value 13 and the reception power of the common channel is higher than the predetermined value. It is preferable to transmit a TPC bit that lowers the power.

  It will be described with reference to FIGS. 9 and 10 that the common channel confirmation means (12, 22) limits the reduction amount of the DPCH transmission power. Assume that the SIR has increased during wireless communication as in step 9-1 of FIG. Here, if only the closed loop means (11, 21) is controlled, the transmission side reduces the DPCH transmission power as C, and the reception side cannot receive the DPCH. On the other hand, the common channel confirmation means (12, 22) estimates the DPCH receivable area from the reception power of the common channel as described above, and the minimum of the DPCH receivable area with respect to the closed loop means (11, 21). Instructs to transmit a TPC bit that reduces the DPCH transmission power to a value. By instructing the common channel confirmation means (12, 22) in this way, it is possible to avoid an excessive SIR quality and to suppress a decrease in DPCH transmission power, thereby avoiding a communication interruption event.

  In the present embodiment, the common channel that interferes with the received power and DPCH format is described as CPICH. However, the common channel confirmation means (12, 22) also considers the timing arrangement of DPCH and other common channels. By determining whether or not to reduce the DPCH transmission power, more appropriate determination can be made. Here, the other common channels are “P-SCH”, “S-SCH”, “P-CCPCH”, “S-CCPCH”, “AICH”, and “HS-SCCH” in FIG. “P-SCH” is a primary synchronization channel, “S-SCH” is a secondary synchronization channel, and “P-CCPCH” is a primary common control physical channel (Primary Common Channel). ), “S-CCPCH” is the primary common control physical channel (Secondary Common Control Physical Channel), “AICH” is the acquisition indication channel (Acquisition Indication Channel), and “HS-SCCH” is the high-speed shared control channel (High) Speed-Share d Control Channel).

1-1: Display unit 1-2: Key operation unit 1-3: CPU
1-4: Storage unit 1-5: Radio unit 1-6: Antenna unit 10: Base station (BTS)
20: Mobile terminal device (UE)
11, 21: Closed loop means 12, 22: Common channel confirmation means 13: SIR target value 14, 24: Transmission / reception unit

Claims (20)

The signal power to interference power ratio (SIR) of a received signal of a dedicated physical channel (DPCH) is measured, and the SIR is compared with the SIR target value in the base station. Closed loop means for adjusting the DPCH transmission power of the base station using a transmission power control (TPC) bit so as to approach the SIR target value;
If the SIR is higher than the SIR target value, the interference between the common channel and the DPCH is confirmed on the reception power of the common channel and the format of the DPCH, the interference occurs, and the reception power of the common channel is predetermined. A common channel confirmation means for stopping transmission of a TPC bit that lowers the DPCH transmission power of the base station to the closed loop means when lower than a value;
A mobile terminal device comprising:   The mobile terminal apparatus according to claim 1, wherein the common channel confirmation unit estimates a DPCH receivable region in which the DPCH can be received based on reception power of the common channel.   The common channel confirmation means lowers the DPCH transmission power of the base station to the lowest value of the DPCH receivable area when the SIR is higher than the SIR target value and the reception power of the common channel is higher than the predetermined value. The mobile terminal apparatus according to claim 2, wherein a TPC bit is transmitted. Closed loop means for measuring the SIR of the received signal on the DPCH, comparing the SIR with the SIR target value, and adjusting the DPCH transmission power of the portable terminal device using the TPC bit so that the SIR approaches the SIR target value When,
If the SIR is higher than the SIR target value, the interference between the common channel and the DPCH is confirmed on the reception power of the common channel and the format of the DPCH, the interference occurs, and the reception power of the common channel is predetermined. A common channel confirmation means for stopping the transmission of the TPC bit that lowers the DPCH transmission power of the portable terminal device to the closed loop means when lower than a value;
A base station comprising:   The base station according to claim 4, wherein the common channel confirmation unit estimates a DPCH receivable area in which the DPCH can be received based on reception power of the common channel.   The common channel confirmation means is configured to reduce the DPCH transmission power of the mobile terminal device to the lowest value of the DPCH receivable area when the SIR is higher than the SIR target value and the reception power of the common channel is higher than the predetermined value. 6. The base station according to claim 5, wherein the lower TPC bit is transmitted. A mobile terminal device according to any one of claims 1 to 3,
A base station according to any of claims 4 to 6;
A wireless communication system. Measure the SIR of the DPCH received signal, compare the SIR with the SIR target value in the base station, and adjust the DPCH transmission power of the base station using the TPC bit so that the SIR approaches the SIR target value Closed-loop procedure;
If the SIR is higher than the SIR target value, the interference between the common channel and the DPCH is confirmed on the reception power of the common channel and the format of the DPCH, the interference occurs, and the reception power of the common channel is predetermined. A common channel confirmation procedure for stopping transmission of a TPC bit that lowers the DPCH transmission power of the base station if lower than a value;
A transmission power control method for a base station comprising:   The base station transmission power control method according to claim 8, wherein the common channel confirmation procedure estimates a DPCH receivable region in which the DPCH can be received based on reception power of the common channel.   In the common channel confirmation procedure, when the SIR is higher than the SIR target value and the reception power of the common channel is higher than the predetermined value, the DPCH transmission power of the base station is lowered to the lowest value of the DPCH receivable area. 10. The transmission power control method for a base station according to claim 9, wherein the TPC bit is transmitted. Closed loop procedure for measuring SIR of received signal of DPCH, comparing SIR with SIR target value, and adjusting DPCH transmission power of portable terminal device using TPC bit so that SIR approaches SIR target value When,
If the SIR is higher than the SIR target value, the interference between the common channel and the DPCH is confirmed on the reception power of the common channel and the format of the DPCH, the interference occurs, and the reception power of the common channel is predetermined. A common channel confirmation procedure for stopping transmission of a TPC bit that lowers the DPCH transmission power of the mobile terminal device when lower than a value;
A transmission power control method for a portable terminal device.   12. The transmission power control method for a mobile terminal apparatus according to claim 11, wherein the common channel confirmation procedure estimates a DPCH receivable region in which the DPCH can be received based on reception power of the common channel. .   In the common channel confirmation procedure, when the SIR is higher than the SIR target value and the reception power of the common channel is higher than the predetermined value, the DPCH transmission power of the mobile terminal device is reduced to the lowest value of the DPCH receivable area. 13. The transmission power control method for a mobile terminal device according to claim 12, wherein a TPC bit to be lowered is transmitted. A transmission power control method for a base station according to any one of claims 8 to 10,
A transmission power control method for a mobile terminal device according to any one of claims 11 to 13,
A transmission power control method for a wireless communication system comprising: Measure the SIR of the DPCH received signal, compare the SIR with the SIR target value in the base station, and adjust the DPCH transmission power of the base station using the TPC bit so that the SIR approaches the SIR target value Closed-loop procedure;
If the SIR is higher than the SIR target value, the interference between the common channel and the DPCH is confirmed on the reception power of the common channel and the format of the DPCH, the interference occurs, and the reception power of the common channel is predetermined. A common channel confirmation procedure for stopping transmission of a TPC bit that lowers the DPCH transmission power of the base station if lower than a value;
Is a transmission power control program for causing a mobile terminal device to realize the above.   16. The transmission power control program according to claim 15, wherein the common channel confirmation procedure estimates a DPCH receivable region in which the DPCH can be received based on reception power of the common channel.   In the common channel confirmation procedure, when the SIR is higher than the SIR target value and the reception power of the common channel is higher than the predetermined value, the DPCH transmission power of the base station is lowered to the lowest value of the DPCH receivable area. The transmission power control program according to claim 16, wherein the TPC bit is transmitted. Closed loop procedure for measuring SIR of received signal of DPCH, comparing SIR with SIR target value, and adjusting DPCH transmission power of portable terminal device using TPC bit so that SIR approaches SIR target value When,
If the SIR is higher than the SIR target value, the interference between the common channel and the DPCH is confirmed on the reception power of the common channel and the format of the DPCH, the interference occurs, and the reception power of the common channel is predetermined. A common channel confirmation procedure for stopping transmission of a TPC bit that lowers the DPCH transmission power of the mobile terminal device when lower than a value;
A transmission power control program for causing the base station to realize   19. The transmission power control program according to claim 18, wherein the common channel confirmation procedure estimates a DPCH receivable region in which the DPCH can be received based on reception power of the common channel.   In the common channel confirmation procedure, when the SIR is higher than the SIR target value and the reception power of the common channel is higher than the predetermined value, the DPCH transmission power of the mobile terminal device is reduced to the lowest value of the DPCH receivable area. The transmission power control program according to claim 19, wherein the TPC bit to be lowered is transmitted.

Images