JP2005051807A - Communication apparatus and communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a reception quality from being deteriorated in the case of asymmetric traffic. <P>SOLUTION: A demodulation section 101 outputs a demodulation signal to quality measuring sections 103 to 105 in a time slot at reception. The quality measuring sections 103 to 105 measure the quality of the demodulation signal from the demodulation section 101. TPC generating sections 106 to 108 respectively set transmission TPC commands in response to a result of the quality measurement by the quality measuring sections 103 to 105. A frame assembling section 109 use the transmission TPC commands 1 to 3 and transmission data to assemble transmission frames. A modulation section 110 applies processing such as prescribed modulation and frequency conversion to signals configured with the frames assembled by the frame assembling section 109. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a communication device and a communication method in a mobile communication system.

  A transmission power control apparatus in a conventional mobile communication system will be described with reference to FIG. Here, a case where wireless communication is performed between two communication devices, that is, a base station device and a mobile station device provided with a conventional transmission power control device will be described as an example. FIG. 14 is a schematic diagram showing a state of downlink closed-loop transmission power control in a base station apparatus and mobile station apparatus provided with a conventional transmission power control apparatus. FIG. 14 shows the control contents of the base station apparatus and the mobile station apparatus in each time slot.

  In time slot 1401, the base station apparatus transmits a signal to the mobile station apparatus. The signal transmitted by the base station apparatus is received by the mobile station apparatus via the transmission path. This mobile station apparatus measures the communication quality of the signal received in time slot 1401, and sets the content of the TPC command for instructing the base station apparatus to raise or lower the transmission power based on the measured communication quality. .

  In time slot 1402, the mobile station apparatus transmits a signal including the TPC command set as described above to the base station apparatus. The signal transmitted by the mobile station apparatus is received by the base station apparatus via the transmission path. The base station apparatus determines the content of the TPC command included in the received signal, and sets the transmission power for the mobile station apparatus according to the TPC command.

  In time slot 1403, the base station apparatus transmits a signal to the mobile station apparatus with the transmission power set as described above. Thereafter, transmission power control is similarly performed between the base station apparatus and the mobile station apparatus.

  However, the communication device including the conventional transmission power control device has the following problems. Here, the base station apparatus and mobile station apparatus described above will be described as an example with reference to FIG. FIG. 15 is a schematic diagram illustrating a state of closed-loop transmission power control of a downlink during asymmetric traffic in a base station apparatus and a mobile station apparatus provided with a conventional transmission power control apparatus.

  When uplink and downlink traffic are asymmetric, the number of uplink time slots and the number of downlink time slots in each frame are different. That is, for example, as shown in FIG. 15, one uplink time slot is provided for one frame, whereas three downlink time slots are provided.

  In this case, the mobile station apparatus controls transmission power in the three time slots of the base station apparatus using one time slot. That is, the mobile station apparatus controls, for example, the transmission power in the three time slots 1502 to 1504 by using the TPC command included in the reception signal in one time slot 1501. For this reason, the base station apparatus performs the same control on the transmission power at the time of three time slots in each frame.

  By the way, although the fading fluctuation of each time slot has a correlation, since the change in the interference amount of each time slot is different, the communication quality in the mobile station apparatus may be greatly different for each time slot. Therefore, the base station apparatus needs to change transmission power individually for three time slots in the downlink.

  However, for the reason described above, since the base station apparatus performs the same control on the transmission power in three time slots in each frame, the accuracy of transmission power control as a whole decreases.

  As described above, in the communication apparatus including the conventional transmission power control apparatus, there is a problem that the reception quality is deteriorated because the accuracy of the transmission power control is reduced during asymmetric traffic.

  SUMMARY An advantage of some aspects of the invention is that it provides a communication device and a communication method capable of preventing deterioration of reception quality during asymmetric traffic.

  The communication apparatus of the present invention comprises: a receiving unit that receives a plurality of TPC commands in one time slot; and a transmitting unit that performs transmission in a plurality of time slots included in one communication unit frame. The TPC command is used to control the transmission power of the plurality of time slots.

  The communication method of the present invention includes a reception step of receiving a plurality of TPC commands in one time slot, and a transmission step of transmitting in a plurality of time slots included in one communication unit frame. The transmission power of the plurality of time slots is controlled by the TPC command.

  According to the present invention, the reception side transmits a signal including information indicating transmission power in each unit slot based on the quality of the signal received by each unit slot in the communication unit frame. Since the transmission power in each unit slot is individually set according to the information, it is possible to prevent the reception quality from deteriorating during asymmetric traffic.

  The essence of the present invention is that the receiving side transmits a signal including information indicating transmission power in each unit slot based on the quality of the signal received by each unit slot in the communication unit frame. The transmission power in each unit slot is individually set according to the information.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, a case where the first communication device and the second communication device each including the transmission power control device according to the present invention perform wireless communication will be described as an example.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a reception unit in a first communication device provided with a transmission power control device according to Embodiment 1 of the present invention. FIG. 2 is a block diagram showing a configuration of a transmission unit in the second communication apparatus provided with the transmission power control apparatus according to Embodiment 1 of the present invention. FIG. 3 is a schematic diagram illustrating a state of a time slot in communication performed between the first communication device and the second communication device including the transmission power control apparatus according to Embodiment 1 of the present invention.

  In this embodiment, as an example of asymmetric traffic, as shown in FIG. 3, in each frame (each communication unit frame), one time slot (for transmission from the first communication device to the second communication device) A case where a unit slot) is used and three time slots are used for transmission from the second communication device to the first communication device will be described.

  First, the structure of the receiving part in the 1st communication apparatus provided with the transmission power control apparatus which concerns on Embodiment 1 is demonstrated. In FIG. 1, a signal transmitted by the second communication device is received by the first communication device via an antenna (not shown), and then subjected to predetermined processing such as frequency conversion in the first communication device and demodulated as a received signal. Sent to the unit 101.

  Demodulation section 101 performs demodulation processing on the received signal and outputs the demodulated signal to separation section 102. Separating section 102 separates the demodulated signal into a received TPC command and received data. The received TPC command is set by the second communication apparatus based on the quality of the received signal, as will be described later.

  Demodulation section 101 outputs a demodulated signal to quality measurement section 103 through quality measurement section 105 according to the time slot at the time of reception. That is, for example, the demodulation unit 101 outputs the demodulated signals in the time slot 302, the time slot 303, and the time slot 304 shown in FIG. 3 to the quality measurement unit 103, the quality measurement unit 104, and the quality measurement unit 105, respectively.

  Quality measuring section 103 to quality measuring section 105 measure the quality of the demodulated signal from demodulating section 101. As a quality measurement standard, SIR (desired wave to interference wave power ratio) of a demodulated signal or the like can be used.

  The TPC generation unit 106 to the TPC generation unit 108 set a transmission TPC command according to the quality measurement results obtained by the quality measurement unit 103 to the quality measurement unit 105, respectively. That is, the TPC generation unit 106 to the TPC generation unit 108 set the transmission TPC command 1 to the transmission TPC command 3 for instructing to increase or decrease the transmission power in each time slot for transmission of the second communication device. Specifically, for example, in frame # 1, TPC generation unit 106 to TPC generation unit 108 transmit for instructing to increase or decrease the transmission power in time slot 306 to time slot 308 of the second communication device. TPC command 1 to transmission TPC command 3 are set.

  Both the quality measurement unit and the TPC generation unit are provided corresponding to the number of transmission time slots from the second communication device to the first communication device.

  Frame assembly section 109 assembles a transmission frame using transmission TPC command 1 to transmission TPC command 3 and transmission data. An example of a transmission frame assembled by the frame assembly unit 109 is shown in FIG. FIG. 4 is a schematic diagram showing an example of a configuration of a transmission frame used by the first communication device including the transmission power control device according to Embodiment 1 of the present invention.

  As shown in FIG. 4, the transmission frame mainly includes a DATA unit 401, a PL unit 402, and a TPC unit 403. Transmission data is inserted into the DATA unit 401, and transmission TPC command 1 to transmission TPC command 3 are inserted into the TPC unit 403. In this embodiment, since three transmission TPC commands are used, the TPC section has a 3-bit configuration. Needless to say, this transmission frame is only an example, and other transmission frames can be used.

  The modulation unit 110 performs predetermined modulation, frequency conversion, and the like on the signal composed of the frames assembled by the frame assembly unit 109. The processed signal is transmitted as a transmission signal to the second communication device via an antenna (not shown).

  Next, the configuration of the transmission unit in the second communication apparatus provided with the transmission power control apparatus according to Embodiment 1 will be described. In FIG. 2, the signal transmitted by the first communication device is received by the second communication device via an antenna (not shown), and then subjected to predetermined processing such as frequency conversion in the second communication device and demodulated as a received signal. Sent to the unit 201.

  Demodulation section 201 performs demodulation processing on the received signal and outputs the demodulated signal to frame decomposition section 202. Frame decomposition section 202 decomposes the demodulated signal into a TPC section and a DATA section, and outputs reception TPC command 1 to reception TPC command 3 included in the TPC section to transmission power control section 203 to transmission power control section 205, respectively. . The contents of the reception TPC command 1 to the reception TPC command correspond to the contents of the transmission TPC command 1 to the transmission TPC command 3 transmitted by the first communication apparatus using the TPC unit 403 in the transmission frame shown in FIG. .

  The frame assembly unit 206 assembles a transmission frame using the transmission data and the transmission TPC command. The transmission TPC command is set based on the quality of the demodulated signal by the demodulator 201. Further, as the transmission frame assembled by the frame assembling unit 206, the transmission frame shown in FIG. 4 can be used. However, since only one transmission TPC command is used for the TPC section, a 1-bit configuration can be used. In addition, this transmission frame is an example, and it cannot be overemphasized that other transmission frames can be used.

  Furthermore, frame decomposition section 202 outputs received TPC command 1 to received TPC command 3 to transmission power control section 203 to transmission power control section 205, respectively, for each frame.

  The modulation unit 207 performs processing such as predetermined modulation and frequency conversion on the signal composed of the frames assembled by the frame assembly unit 206. Furthermore, modulation section 207 outputs the processed signal to transmission power control section 203 to transmission power control section 205 according to the time slot at the time of transmission. That is, for example, modulation section 207 outputs the processed signals in time slot 302, time slot 303, and time slot 304 shown in FIG. 3 to transmission power control section 203 to transmission power control section 205, respectively.

  The transmission power control unit 203 to the transmission power control unit 205 transmit the processed signals from the modulation unit 207 in predetermined time slots at the time of transmission (time slot 302 to time slot 304 in frame # 1 in FIG. 3, respectively). Are transmitted using reception TPC command 1 to reception TPC command 3, respectively. Specifically, the transmission power control unit 203 to the transmission power control unit 205 set the transmission power of the signal from the modulation unit 207 based on the contents of the reception TPC command 1 to the reception TPC command 3, respectively. It amplifies to set power and transmits it to the first communication device via an antenna (not shown).

  The transmission power control unit is provided corresponding to the number of transmission time slots from the second communication device to the first communication device.

  Next, the operation of transmission power control by the first communication apparatus and the second communication apparatus having the above-described configuration will be described with reference to FIGS. 1 and 2 again while following the time slots shown in FIG.

  First, in frame # 1, the signal transmitted by the second communication device in time slot 302 to time slot 304 is demodulated by demodulation unit 101 in the first communication device, and then quality measurement unit 103 to quality measurement unit, respectively. The quality is measured by 105. That is, the communication quality is measured for each time slot for transmission of the second communication device.

  Furthermore, transmission TPC command 1 to transmission TPC command 3 are set by TPC generation unit 106 to TPC generation unit 108 based on the measurement results by quality measurement unit 103 to quality measurement unit 105, respectively.

  The transmission TPC command 1 to the transmission TPC command 3 and the transmission data set as described above are inserted into the frame by the frame assembling unit 109 to assemble the transmission frame. The transmission frame is subjected to predetermined modulation and frequency conversion by the modulation unit 110.

  Next, in frame # 2, in the time slot 305, a signal subjected to the predetermined modulation and frequency conversion is transmitted from the first communication apparatus to the second communication apparatus.

  On the other hand, in the second communication device, the signal transmitted from the first communication device is received, and the received signal is demodulated by the demodulation unit 201 and then received by the frame decomposition unit 202 and received TPC commands 1 to 1 are received. The TPC command 3 is decomposed.

  The frame assembly unit 206 assembles a transmission frame using the transmission data and the transmission TPC command. The transmission frame is subjected to predetermined modulation and frequency conversion by the modulation unit 207.

  Further, in transmission power control section 203 to transmission power control section 205, the transmission power for the signal from modulation section 207 is set based on reception TPC command 1 to reception TPC command 3, respectively.

  In time slot 306 to time slot 308, the signal from modulation section 207 is amplified and transmitted to the first communication device so that the transmission power set as described above is obtained. That is, the transmission power of the signal transmitted by the second communication device in time slot 306 to time slot 308 depends on the quality of the signal received by the first communication device in time slot 302 to time slot 304, respectively. These are set so that the reception quality of the first communication device in slot 306 to time slot 308 is good.

  Thus, according to the present embodiment, the first communication device sets the TPC command for each time slot according to the quality of the signal received from the second communication device in each time slot in the frame. The second communication device transmits a signal including the set TPC command to the second communication device, while the second communication device controls the transmission power in each time slot in accordance with the TPC command. Even in different situations, it is possible to perform transmission power control with high accuracy according to the communication quality. As a result, it is possible to provide a transmission power device capable of preventing degradation of reception quality even during asymmetric traffic.

  In the present embodiment, as an example of asymmetric traffic, one time slot is used for transmission from the first communication device to the second communication device in each frame, and the second communication device to the first communication device. Although the case where three time slots are used for transmission to the communication device has been described, the present invention is not limited to this, and the number of time slots for transmission from the first communication device to the second communication device, and the first The present invention is also applicable when the number of transmission time slots from the two communication devices to the first communication device and the order of the transmission time slots are appropriately changed. In this case, for example, the number of quality measurement units and TPC generation units illustrated in FIG. 1 and the transmission power control unit illustrated in FIG. 2 may be appropriately changed.

  In the present embodiment, only the receiving unit in the transmission power control device has been described for the first communication device, and only the transmission unit in the transmission power control device has been described for the second communication device. Both the device and the second communication device can be equipped with a receiving unit and a transmitting unit in the transmission power control device. Therefore, the 2nd communication apparatus can also control the transmission power of the 1st communication apparatus based on the reception quality of the signal which the 1st communication apparatus transmitted like the 1st communication apparatus mentioned above.

  Furthermore, although the case where the first communication device and the second communication device perform wireless communication has been described in the present embodiment, the present invention is not limited to this, for example, the transmission power according to the present embodiment. The present invention is also applicable when a base station device provided with a control device and a mobile station device perform wireless communication.

(Embodiment 2)
The second embodiment is a form in which the TPC portion of each transmission frame in the first communication device has a 1-bit configuration in the first embodiment.

  In Embodiment 1 described above, since three time slots are used for transmission from the second communication apparatus to the first communication apparatus, three transmissions are included in the TPC section in each transmission frame in the first communication apparatus. A TPC command (3 bits) was included.

  However, when the number of transmission time slots from the second communication device to the first communication device increases, it is necessary to increase the number of bits of the TPC section in each transmission frame in the first communication device according to the increase number. Therefore, there is a possibility that the use efficiency of the transmission frame in the first communication device is lowered.

  Therefore, in the present embodiment, the first communication device controls the transmission power in any one of the plurality of transmission time slots of the second communication device in the transmission time slot in each frame. Therefore, the TPC part in each transmission frame is configured to have a 1-bit configuration. Hereinafter, the transmission power control apparatus according to the present embodiment will be described with reference to FIGS. It is assumed that the state of asymmetric traffic is the same as that in the first embodiment.

  FIG. 5 is a schematic diagram showing a concept of a transmission power control method performed between the first communication apparatus and the second communication apparatus provided with the transmission power control apparatus according to Embodiment 2 of the present invention. FIG. 6 is a block diagram showing a configuration of a reception unit in the first communication device including the transmission power control apparatus according to Embodiment 2 of the present invention. FIG. 7 is a block diagram illustrating a configuration of a transmission unit in the second communication apparatus including the transmission power control apparatus according to the second embodiment.

  First, a transmission power control method performed between the first communication device and the second communication device will be conceptually described. As shown in FIG. 5, in the transmission time slot 504 in frame # 2, the first communication apparatus transmits a TPC command set based on the quality of the signal received in time slot 501 in frame # 1. . Thereafter, the first communication apparatus transmits a TPC command set based on the quality of the signal received in the time slot 506 in the frame # 2 in the transmission time slot 508 in the frame # 3. In the transmission time slot 512 in # 4, a TPC command set based on the quality of the signal received in the time slot 511 in frame # 3 is transmitted. Thereafter, the first communication device repeats the series of operations described above.

  That is, in each frame, the first communication device selects any one of the plurality of transmission time slots (1) to (3) of the second communication device according to a predetermined order, and selects the selected time. A TPC command for controlling the transmission power of the second communication device in the slot is transmitted in the transmission time slot.

  Next, configurations of the first communication device and the second communication device for realizing the transmission power control as described above will be described with reference to FIGS. 6 and 7. First, the configuration of the first communication device will be described with reference to FIG. In addition, about the structure similar to Embodiment 1 (FIG. 1) in FIG. 6, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The switching unit 601 selects one of the demodulated signals for each reception time slot output from the demodulator 101 as an input signal for each frame according to a preset order, and selects the selected demodulated signal for quality Output to the measurement unit 602. That is, referring to FIG. 5, switching unit 601 selects a demodulated signal in time slot 501 (time slot (1)) in frame # 1, and each time in frame # 2 and frame # 3. The demodulated signals in slot 506 (time slot (2)) and time slot 511 (time slot (3)) are selected.

  Quality measuring section 602 measures the quality of the demodulated signal sent via switching section 601. The TPC generation unit 603 sets a transmission TPC command according to the quality measurement result by the quality measurement unit 602.

  The frame assembling unit 604 assembles a transmission frame using the transmission TPC command and transmission data. The transmission frame assembled by the frame assembly unit 109 is the same as that by the frame assembly unit 109 in the first embodiment (see FIG. 3). However, in this embodiment, only one transmission TPC command is sent from the TPC generation unit 603, so the TPC unit 403 has a 1-bit configuration.

  Next, the configuration of the second communication device will be described with reference to FIG. In addition, about the structure similar to Embodiment 1 (FIG. 2) in FIG. 7, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  Frame decomposition section 701 decomposes the demodulated signal into a TPC section and a DATA section, and outputs a received TPC command included in the TPC section to switching section 702. The content of the reception TPC command corresponds to the content of the transmission TPC command transmitted by the first communication apparatus using the TPC unit 403 in the transmission frame shown in FIG.

  For each frame, switching unit 702 selects one of transmission power control unit 703 to transmission power control unit 705 as the output destination of the received TPC command from frame decomposition unit 701 according to a preset order. That is, for example, the switching unit 702 selects the transmission power control unit 703 corresponding to the time slot (1) in the frame # 2 (see FIG. 5) as the output destination, and in the frame # 3 and the frame # 4, respectively, The transmission power control unit 704 corresponding to the slot (2) and the transmission power control unit 705 corresponding to the time slot (3) are selected.

  The transmission power control unit 703 to the transmission power control unit 705 set the transmission power of the signal from the modulation unit 207 based on the content of the received TPC command from the switching unit 702 in a predetermined time slot at the time of transmission. The signal is amplified to the set power and transmitted to the first communication device via an antenna (not shown). For example, referring to FIG. 5, the predetermined time slot corresponds to the transmission power control unit 703 to the transmission power control unit 705 in time slot 505 to time slot 507, respectively.

  Further, when the transmission power control unit 703 to the transmission power control unit 705 are not selected as the output destination by the switching unit 702, the transmission power control unit 703 sets the transmission power based on the content of the received TPC command that was input when it was selected as the previous output destination. Use.

  Thus, according to the present embodiment, the first communication device transmits the transmission power in any one of the plurality of transmission time slots of the second communication device in the transmission time slot in each frame. By selecting and transmitting a TPC command for controlling the TPC command according to a preset order, the TPC section in each transmission frame can be configured with one bit. Furthermore, since the first communication device can individually control the transmission power in each transmission time slot of the second communication device according to the quality of the signal received in each reception time slot, the communication quality is time Even in a situation that varies from slot to slot, it is possible to execute transmission power with high accuracy in accordance with the communication quality without reducing transmission frame utilization efficiency.

  In the present embodiment, the example in which the transmission power in each transmission time slot of the second communication device is controlled as described above is shown as an example. However, the present invention is based on various conditions. The present invention can also be applied when appropriately changed accordingly.

(Embodiment 3)
The third embodiment is a combination of the first embodiment and the first embodiment in order to cope with a case where the communication quality varies at a high speed. In Embodiment 2 described above, the first communication device controls the transmission power in any one of the plurality of transmission time slots of the second communication device in the transmission time slot in each frame. By transmitting the TPC command for this purpose, the TPC portion in each transmission frame can be configured with 1 bit.

  However, since the TPC section in the transmission frame of the first communication device has a 1-bit configuration, only the transmission power in one transmission time slot per frame is controlled for the second communication device. That is, in order to control the transmission power in all the transmission time slots in the second communication device, only frames corresponding to the total number of transmission time slots in one frame are required.

  For this reason, when the fluctuation speed of the communication quality is high, the transmission power control for the second communication apparatus becomes inaccurate, and the reception quality of the first communication apparatus may deteriorate. In particular, when the number of transmission time slots in each frame of the second communication device is large, the possibility that the reception quality of the first communication device is deteriorated further increases.

  Therefore, in the present embodiment, the first embodiment and the second embodiment described above are combined. Hereinafter, the transmission power control apparatus according to the present embodiment will be described with reference to FIGS. FIG. 8 is a schematic diagram showing a concept of a transmission power control method performed by the first communication apparatus and the second communication apparatus provided with the transmission power control apparatus according to Embodiment 3 of the present invention. FIG. 9 is a block diagram illustrating a configuration of a reception unit in the first communication device including the transmission power control apparatus according to Embodiment 3 of the present invention. FIG. 10 is a block diagram illustrating a configuration of a transmission unit in the second communication apparatus including the transmission power control apparatus according to the third embodiment.

  In this embodiment, as an example of asymmetric traffic, as shown in FIG. 8, one time slot is used for transmission from the first communication device to the second communication device in each frame, as shown in FIG. A case will be described where four time slots are used for transmission from to the first communication device.

  First, a transmission power control method performed between the first communication device and the second communication device will be conceptually described. As shown in FIG. 8, in the transmission time slot 805 in frame # 2, the first communication device sets each of the time slots 801 and time slot 802 in frame # 1 based on the quality of the signal received Send a TPC command. Thereafter, in the transmission time slot 810 in frame # 3, the first communication apparatus transmits each TPC command set based on the quality of the signal received in time slot 808 and time slot 809 in frame # 2. To do. Thereafter, the first communication device repeats the series of operations described above.

  That is, in each frame, the first communication device selects any two of the plurality of transmission time slots (1) to (3) of the second communication device according to a predetermined order, and selects the selected time. A TPC command for controlling the transmission power of the second communication device in the slot is transmitted at once in the transmission time slot. In the example shown in FIG. 8, any two of the transmission time slots (1) to (3) are selected according to a predetermined order, but there are four or more transmission time slots. Needless to say, the number of transmission time slots to be selected in each frame is appropriately changed.

  Next, configurations of the first communication device and the second communication device for realizing the transmission power control as described above will be described with reference to FIGS. 9 and 10. First, the configuration of the first communication device will be described with reference to FIG. In addition, about the structure similar to Embodiment 2 (FIG. 6) in FIG. 9, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The difference between demodulating section 901 and demodulating section 101 in Embodiment 2 is that the demodulated signal is output to switching section 902 and switching section 903 according to the time slot at the time of reception. That is, for example, demodulation section 901 outputs the demodulated signals in time slot 801 and time slot 803 shown in FIG. 8 to switching section 902 and outputs the demodulated signals in time slot 802 and time slot 804 to switching section 903.

  Switching section 902 selects one of the demodulated signals for each reception time slot output from demodulating section 901 as an input signal for each frame according to a preset order, and selects the selected demodulated signal for quality Output to the measurement unit 602. That is, referring to FIG. 8, switching unit 902 selects a demodulated signal in time slot 801 (time slot (1)) in frame # 1, and time slot 808 (time slot) in frame # 2. Select the demodulated signal in (3)).

  The basic configuration of the switching unit 903 is the same as that of the switching unit 902. That is, referring to FIG. 8, switching section 903 selects a demodulated signal in time slot 802 (time slot (2)) in frame # 1, and time slot 809 (time slot) in frame # 2. Select the demodulated signal in (4)).

  The frame assembly unit 904 is different from the frame assembly unit 604 in the second embodiment in that the TPC unit 403 in the transmission frame shown in FIG. 3 is changed to a 2-bit configuration in order to include two TPC commands in the transmission frame. The transmission frame is used. That is, the frame assembling unit 904 assembles a transmission frame using the transmission data and two transmission TPC commands.

  Next, the configuration of the second communication device will be described with reference to FIG. In addition, about the structure similar to Embodiment 2 (FIG. 7) in FIG. 10, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The difference between frame decomposition section 1001 and frame decomposition section 701 in Embodiment 2 is that reception TPC command 1 and reception TPC command 2 included in the TPC section in the demodulated signal are output to switching section 1002 and switching section 1003, respectively. That is.

  The switching unit 1002 selects either the transmission power control unit 1006 or the transmission power control unit 1007 as an output destination of the reception TPC command 1 from the frame decomposition unit 1001 for each frame according to a preset order. That is, referring to FIG. 8, switching unit 1002 selects transmission power control unit 1006 in frame # 2 and output power control unit 1007 in frame # 3 as an output destination.

  The basic configuration of the switching unit 1003 is the same as that of the switching unit 1002. That is, referring to FIG. 8, switching unit 1003 selects transmission power control unit 1004 in frame # 2 and output power control unit 1005 in frame # 3 as an output destination.

  The basic configuration of each of transmission power control section 1004 to transmission power control section 1007 is the same as that of each transmission power control section in the second embodiment. It goes without saying that the number of transmission power control units provided corresponds to the total number of transmission time slots of the second communication device in each frame shown in FIG.

  Here, the effect of transmission power control by the first communication device and the second communication device having the above-described configuration will be described in comparison with the above-described first and second embodiments.

  In the asymmetric traffic shown in FIG. 5, according to the first embodiment, the first communication device can perform transmission power in each transmission time slot of the second communication device individually and for each frame. Although the control cycle can be shortened, the configuration of the TPC section in the transmission frame becomes large (4 bits). Next, according to the second embodiment, the first communication device can reduce the configuration of the TPC unit in the transmission frame. For example, when the TPC unit has a 1-bit configuration, In order to individually control the transmission power in the time slot, four frames are required, so that the control cycle becomes long.

  On the other hand, according to the third embodiment, the first communication device, for example, by controlling the transmission power in all the transmission time slots of the second communication device individually by setting the TPC unit to a 2-bit configuration, Only two frames are needed. That is, the control cycle can be shortened.

  Thus, according to the present embodiment, by combining the first embodiment and the second embodiment, the first communication device individually controls the transmission power in each transmission time slot of the second communication device. The control cycle can be shortened. Thereby, even when the fluctuation speed of the communication quality is high, the transmission power control for the second communication apparatus can be performed with high accuracy, and thus the possibility that the reception quality of the first communication apparatus is deteriorated can be suppressed. it can.

  In the present embodiment, the control order for the transmission power in each transmission time slot of the second communication device, the number of bits of the TPC section, and the state of asymmetric traffic are examples, and the present invention appropriately sets them. It can also be applied when changed.

(Embodiment 4)
The fourth embodiment is a form in which only the transmission power in the specific transmission time slot of the second communication device can be controlled in the first embodiment. In wireless communication, it may be necessary to centrally control only the transmission power in a specific time slot. This case will be described with reference to FIG.

  FIG. 11 is a schematic diagram illustrating how another base station apparatus interferes with communication between the mobile station apparatus and the base station apparatus. FIG. 11 shows a state in which wireless communication is performed between the mobile station apparatus (MS) 1101 and the base station apparatus (BTS1) 1102, and the cell 1104 and the base station apparatus ( The respective ranges of the BTS 2) 1103 cell 1105 are shown. Here, the base station apparatus 1102 uses time slots # 1 to # 3 for wireless communication with the mobile station apparatus 1101, and the base station apparatus 1103 uses time for wireless communication with other mobile station apparatuses. Assume that slot # 3 is used and time slot # 1 and time slot # 2 are not used.

  In the state after moving from P1 to P2, the mobile station apparatus (MS) receives almost no interference from the base station apparatus 1103 in the time slot # 1 and the time slot # 2. The signal can be received well. However, in time slot # 3, since the base station apparatus 1103 transmits a signal to another mobile station apparatus, the mobile station apparatus 1101 receives interference due to the signal transmitted by the base station apparatus 1103. There is a possibility that the reception situation for the signal from the base station apparatus 1102 will deteriorate.

  Furthermore, in the state after moving from P2 to P3, the mobile station apparatus 1101 hardly receives interference from the base station apparatus 1103. Therefore, not only the time slot # 1 and the time slot # 2, but also the time slot # 3 However, the reception status with respect to the signal from the base station apparatus 1102 becomes good.

  As described above, in wireless communication, fluctuations in communication status may become high in a specific time slot (in the above example, time slot # 3). Therefore, in such a case, it is necessary to centrally control the transmission power in a specific time slot.

  Therefore, in the present embodiment, transmission power in a specific time slot is intensively controlled according to the communication status in each time slot. Hereinafter, the transmission power control apparatus according to the present embodiment will be described with reference to FIG. 12 and FIG. In the present embodiment, a case will be described in which various conditions (see FIG. 3) such as the state of asymmetric traffic are the same as those in the first embodiment.

  FIG. 12 is a block diagram showing a configuration of a reception unit in the first communication device including the transmission power control apparatus according to Embodiment 4 of the present invention. FIG. 13 is a block diagram showing a configuration of a transmission unit in the second communication apparatus provided with the transmission power control apparatus according to Embodiment 4 of the present invention.

  First, the configuration of the first communication device will be described with reference to FIG. In addition, about the structure similar to Embodiment 1 (FIG. 1) in FIG. 12, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The TPC generation unit 1201 selects a time slot to be controlled from each transmission time slot in the second communication device based on the reception quality measurement results from the quality measurement unit 103 to the quality measurement unit 105. That is, the TPC generation unit 1201 searches for reception quality from the quality measurement unit 103 to the quality measurement unit 105 that is too good or bad, and sets the corresponding time slot as a control target. For example, in frame # 2, when the reception quality measurement result from the quality measurement unit 104 is bad, the time slot (2) is set as a control target (see FIG. 3).

  Further, the TPC command generation unit 1201 sets a transmission TPC command according to the reception quality in the time slot to be controlled, and outputs the time slot number corresponding to the transmission TPC command to the frame assembly unit 1202. In the above example, the time slot number is “2”.

  The frame assembly unit 1202 is different from the frame assembly unit 109 in the first embodiment in that a transmission frame is assembled using transmission data, a transmission TPC command, and a time slot number. As the transmission frame, for example, the transmission frame shown in FIG. 4 can be used as in the first embodiment. The time slot number may be transmitted using 1 bit of the TPC unit 403 having a 2-bit configuration, for example.

  Next, the configuration of the second communication device will be described with reference to FIG. In addition, about the structure similar to Embodiment 1 (FIG. 2) in FIG. 13, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  Frame decomposition section 1301 decomposes the demodulated signal into a TPC section and a DATA section, and outputs the received TPC command and time slot number contained in the TPC section to switching section 1302.

  Switching unit 1302 selects the output destination of the received TPC command according to the time slot number. That is, for example, in the above example, since the time slot number is “2”, the switching unit 1302 selects the transmission power control unit 204 as the output destination of the received TPC command. As a result, the received TPC command is output to the transmission power control unit 204. Therefore, the transmission power control unit 204 sets the transmission power of the signal from the modulation unit 207 based on the content of the reception TPC command, and then the above signal. Is transmitted to the first communication device via an antenna (not shown).

  As described above, according to the present embodiment, only the transmission power in the specific transmission time slot of the second communication device can be controlled intensively, and therefore, when the fluctuation of the communication status in the specific time slot becomes high speed In this case, the state of the first communication device can be maintained well.

  In the present embodiment, a case has been described in which one time slot is a target for which transmission power is intensively controlled. However, the present invention is not limited to this, and the target time slot is set to two. It is also applicable when there are more than two. In this case, the first communication device may transmit two or more transmission TPC commands and a target time slot number to the second communication device. As a method for transmitting two or more transmission TPC commands and a target time slot number, the above-described first to third embodiments can be applied.

  Also, in the communication situation shown in FIG. 11, the above-mentioned problems are solved by installing the transmission power control apparatus according to the present embodiment in mobile station apparatus 1101 and base station apparatus 1102, respectively. That is, when the mobile station device 1101 is located at P2, the reception status in the time slot # 3 of the mobile station device 1101 is good by centrally controlling the transmission power of the base station device 1102 in the time slot # 3. Maintained in a state.

  The transmission power control apparatus according to the present invention can be installed in a communication terminal apparatus or base station apparatus in a digital radio communication system.

  The present invention is suitable for use in a communication device in a mobile communication system.

The block diagram which shows the structure of the receiving part in the 1st communication apparatus provided with the transmission power control apparatus which concerns on Embodiment 1 of this invention. The block diagram which shows the structure of the transmission part in the 2nd communication apparatus provided with the transmission power control apparatus which concerns on the said Embodiment 1. FIG. The schematic diagram which shows the mode of the time slot in the communication performed between the 1st communication apparatus provided with the transmission power control apparatus which concerns on the said Embodiment 1, and a 2nd communication apparatus. The schematic diagram which shows an example of the structure of the transmission frame which a 1st communication apparatus provided with the transmission power control apparatus which concerns on the said Embodiment 1 uses. The schematic diagram which shows the concept of the transmission power control method performed between the 1st communication apparatus provided with the transmission power control apparatus which concerns on Embodiment 2 of this invention, and a 2nd communication apparatus. The block diagram which shows the structure of the receiving part in the 1st communication apparatus provided with the transmission power control apparatus which concerns on the said Embodiment 2. FIG. The block diagram which shows the structure of the transmission part in the 2nd communication apparatus provided with the transmission power control apparatus which concerns on the said Embodiment 2. FIG. The schematic diagram which shows the concept of the transmission power control method performed by the 1st communication apparatus provided with the transmission power control apparatus which concerns on Embodiment 3 of this invention, and a 2nd communication apparatus. The block diagram which shows the structure of the receiving part in the 1st communication apparatus provided with the transmission power control apparatus which concerns on the said Embodiment 3. FIG. The block diagram which shows the structure of the transmission part in the 2nd communication apparatus provided with the transmission power control apparatus which concerns on the said Embodiment 3. FIG. The schematic diagram which shows a mode that another base station apparatus interferes with respect to communication with a mobile station apparatus and a base station apparatus The block diagram which shows the structure of the receiving part in the 1st communication apparatus provided with the transmission power control apparatus which concerns on Embodiment 4 of this invention. The block diagram which shows the structure of the transmission part in the 2nd communication apparatus provided with the transmission power control apparatus which concerns on the said Embodiment 4. FIG. Schematic diagram showing the state of downlink closed-loop transmission power control in a base station apparatus and mobile station apparatus equipped with a conventional transmission power control apparatus Schematic diagram showing the state of downlink closed-loop transmission power control during asymmetric traffic in a base station apparatus and mobile station apparatus equipped with a conventional transmission power control apparatus

Explanation of symbols

101, 901, 201 Demodulator 202, 701, 1001, 1301 Frame decomposition unit 203-205, 703-705, 1004-1007 Transmission power control unit 103-105, 602 Quality measurement unit 106-108, 603, 1201 TPC generation unit 109,604,904,1202 Frame assembly part 110,207 Modulation part 601,702,902,903,1002,1003,1302 Switching part

Claims (20)

Receiving means for receiving a plurality of TPC commands in one time slot, and transmission means for transmitting in a plurality of time slots included in one communication unit frame,
A communication apparatus that controls transmission power of the plurality of time slots according to the received plurality of TPC commands. Receiving means for receiving a plurality of predetermined number of TPC commands in one time slot, and transmitting means for transmitting in a plurality of time slots included in one communication unit frame,
A communication apparatus that controls transmission power of the same number of time slots as the received TPC command by the TPC command.   The communication apparatus according to claim 2, wherein the transmission power controlled time slot is changed for each communication unit frame.   The communication apparatus according to claim 2, wherein the time slot for which transmission power is controlled is selected according to a predetermined order.   The communication apparatus according to any one of claims 1 to 4, which performs asymmetric communication.   The communication device according to any one of claims 1 to 4, wherein in the communication unit frame, the number of time slots used for reception and the number of time slots used for transmission are different.   The communication apparatus according to claim 6, wherein communication is performed in a unit frame for communication in which one time slot is used for reception and a plurality of time slots are used for transmission.   The communication apparatus according to claim 1, wherein the communication apparatus is a mobile station apparatus.   The communication apparatus according to claim 1, wherein the communication apparatus is a base station apparatus. A communication device that controls transmission power in one time slot used for transmission with one TPC command,
Receiving means for receiving a plurality of TPC commands in one time slot used for reception;
Transmission power control means for controlling transmission power in a plurality of time slots used for transmission included in the same communication unit frame as the one time slot used for reception based on the TPC command. apparatus. A communication device that controls transmission power in one time slot used for transmission with one TPC command,
Receiving means for receiving a plurality of and a predetermined number of TPC commands in one time slot used for reception;
Transmission power control means for controlling transmission power in the same number of time slots used for transmission included in the same communication unit frame as one time slot used for reception based on the TPC command. A communication device. A reception step of receiving a plurality of TPC commands in one time slot; and a transmission step of transmitting in a plurality of time slots included in one communication unit frame,
A communication method for controlling transmission power of the plurality of time slots according to the received plurality of TPC commands. A reception step of receiving a plurality of predetermined number of TPC commands in one time slot, and a transmission step of transmitting in a plurality of time slots included in one communication unit frame,
A communication method for controlling transmission power of the same number of time slots as the received TPC command by the TPC command.   The communication method according to claim 13, wherein the transmission power controlled time slot is changed for each communication unit frame.   The communication method according to claim 13, wherein the transmission power controlled time slots are selected according to a predetermined order.   The communication method according to claim 12, wherein asymmetric communication is performed.   16. The communication method according to claim 12, wherein the number of time slots used for reception and the number of time slots used for transmission are different in the communication unit frame.   The communication method according to claim 17, wherein in the communication unit frame, there is one time slot used for reception and a plurality of time slots used for transmission. A communication method for controlling transmission power in one time slot used for transmission with one TPC command,
A reception step of receiving a plurality of TPC commands in one time slot used for reception;
And a transmission power control step of controlling transmission power in a plurality of time slots used for transmission included in the same communication unit frame as one time slot used for reception based on the TPC command. Method. A communication method for controlling transmission power in one time slot used for transmission with one TPC command,
A reception step of receiving a plurality of and a predetermined number of TPC commands in one time slot used for reception;
A transmission power control step for controlling transmission power in the same number of time slots used for transmission included in the same communication unit frame as one time slot used for reception based on the TPC command. A characteristic communication method.

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