JP2006295679A - Cdma wireless communication apparatus and cdma wireless communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the influence of an interference wave in the reception of a transmission power control bit or PI data in an inferior reception environment without increasing throughput. <P>SOLUTION: In an uplink transmission power control bit generating section 111 of a CDMA base station device 100, levels of an SIR measured value and a target SIR value are compared and if the SIR measured value is less than the target SIR, an UP command instructing a mobile station to increase transmission power is generated and if the SIR measured value is equal with or higher than the target SIR, on the other hand, a DOWN command instructing the mobile station to decrease the transmission power is generated but TPC bits corresponding to the UP command and the DOWN command are generated so as to alternately switch a bit "0" and a bit "1" for each slot. In a CDMA mobile station device, the influence of the interference wave can be reduced without increasing reception throughput. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a CDMA wireless communication apparatus which is a base station apparatus or a mobile station apparatus in a CDMA mobile communication system, and a CDMA wireless communication method implemented by the CDMA wireless communication apparatus.

  In a CDMA mobile communication system, closed loop transmission power control is generally applied as a transmission power control method. For example, in the case of uplink transmission power control, the base station measures uplink reception quality, creates a TPC (Transmit Power Control) bit, which is a transmission power control bit, from the measured value and the target value, and creates a mobile station. Send to. The mobile station controls the uplink transmission power based on the received TPC bit. As a result, the uplink transmission power is minimized, and low power consumption and increase in subscriber capacity are realized.

  As for the TPC bit, for example, in 3GPP (3rd Generation Partnership Project), the UP command defines a bit pattern in which all the bits are set to “1”, and the DOWN command defines all the bits in “0” (non-notified). Patent Document 1).

  By the way, conventionally, in the case of uplink transmission power control, there is a problem that the mobile station cannot accurately perform uplink transmission power control when the downlink reception environment is bad. This is because, in the CDMA system, many channels share time and frequency, so that interference occurs with each other, and each mobile station is affected by interference waves from other channels.

  FIG. 13 is a constellation diagram for explaining the transition of reception signal points when reception quality is poor. That is, when the signal of the other channel (for example, the common pilot channel having a large transmission power) is larger than the reception level of the channel being received, the reception signal point is shown in FIG. 13 due to the interference wave from the other channel. In addition, an offset from the original reception signal point 1301 to the reception signal point 1302 occurs.

  In such a situation, even if the base station transmits the UP command and the DOWN command with the same probability, the mobile station has a higher probability of determining it as an UP command, or conversely, has a higher probability of determining it as a DOWN command. May occur. In the former case, since the transmission power of the mobile station becomes excessive, interference with many users is increased, resulting in a decrease in subscriber capacity. On the other hand, in the latter case, call disconnection occurs.

As a solution for preventing such erroneous determination, conventionally, a mobile station measures a received SIR (Signal to Interference Ratio) from each base station, and the SIR value is equal to or less than a predetermined reference value. By ignoring the transmission power control information (TPC bit) from the base station and maintaining the current transmission power, it is possible to prevent the uplink transmission power from being erroneously controlled according to the transmission power control information with low reliability ( For example, see Patent Document 1).
JP-A-9-312609 3GPP TS 25.211

  However, in the conventional uplink transmission power control method described above, the mobile station requires a large amount of processing, for example, it is necessary to measure the SIR for each base station or for each path. This can also be pointed out in downlink transmission power control.

  On the other hand, the reception of PI (Paging indicator) data for controlling incoming / outgoing calls is also affected by the interference wave in the mobile station, as with TPC bit demodulation, and the received signal is offset, making it easy to make an erroneous determination. There is also a problem that performance deteriorates.

  The present invention has been made in view of such a point, and even when the downlink reception quality or the uplink reception quality is poor, the influence of the interference wave can be reduced without increasing the processing amount in reception of the transmission power control information. An object of the present invention is to provide a CDMA wireless communication apparatus and a CDMA wireless communication method.

  The present invention also provides a CDMA radio communication apparatus and a CDMA radio communication method capable of reducing the influence of interference waves without increasing the amount of processing in PI data reception even when the downlink reception quality is poor. Objective.

  In order to solve such a problem, the CDMA radio communication apparatus according to the present invention transmits a bit “0” for each transmission power control bit to be transmitted corresponding to the UP command and the DOWN command to the other CDMA radio communication apparatus. "And the bit" 1 "are configured to include a means for generating a bit pattern in which the bit" 1 "is alternately switched.

  According to this configuration, the CDMA radio communication apparatus that instructs transmission power control reduces the influence of interference waves on the other CDMA radio communication apparatus receiving the instruction without increasing the processing amount. It can be transmitted in a format that can be received.

  When controlling the transmission power to be transmitted based on the received transmission power control bit, the CDMA wireless communication apparatus according to the present invention has a bit “0” and a bit “1” for each fixed period of the received transmission power control bit. A configuration is adopted in which means is provided for interpreting a bit pattern in which "" is alternately switched and determining whether the command is an UP command or a DOWN command.

  According to this configuration, a CDMA wireless communication apparatus that receives an instruction and controls transmission power can perform transmission power control bit reception processing with less influence of interference waves without increasing the amount of processing. As a result, the transmission power control information reception determination performance can be improved.

  The CDMA radio communication apparatus according to the present invention transmits the transmission power control bit when the slot format for transmitting the transmission power control bits corresponding to the UP command and the DOWN command to the other CDMA radio communication apparatus can collectively transmit a plurality of bits. A configuration is adopted that includes means for generating the power control bits as a bit pattern in which the number of bits “0” is equal to the number of bits “1”.

  According to this configuration, the CDMA radio communication apparatus that instructs transmission power control reduces the influence of interference waves on the other CDMA radio communication apparatus receiving the instruction without increasing the processing amount. It can be transmitted in a format that can be received.

  When controlling the transmission power to be transmitted based on the received transmission power control bit, the CDMA wireless communication apparatus according to the present invention has the number of bits “0” and the bit “1” of the received transmission power control bit. A configuration is adopted that includes means for determining whether the command is an UP command or a DOWN command by taking a correlation between a bit pattern equal in number and a bit pattern prepared in advance.

  According to this configuration, a CDMA wireless communication apparatus that receives an instruction and controls transmission power can perform transmission power control bit reception processing with less influence of interference waves without increasing the amount of processing. As a result, the transmission power control information reception determination performance can be improved.

  In the CDMA radio communication method according to the present invention, one CDMA radio communication device transmits a transmission power control bit corresponding to an UP command and a DOWN command, and the other CDMA radio communication device receives the transmission power control bit. When the transmission power to be transmitted is controlled based on this, the one CDMA wireless communication apparatus transmits the transmission power control bit as a bit pattern in which the bit “0” and the bit “1” are alternately switched at regular intervals. The other CDMA wireless communication apparatus interprets the received bit pattern of the transmission power control bits and determines whether the command is an UP command or a DOWN command.

  According to this method, transmission power control bit reception processing can be performed with less influence of interference waves without increasing the amount of processing even when downlink reception quality or uplink reception quality is poor. Control information reception determination performance can be improved.

  In the CDMA radio communication method according to the present invention, one CDMA radio communication device transmits a transmission power control bit corresponding to an UP command and a DOWN command, and the other CDMA radio communication device receives the transmission power control bit. When controlling the transmission power to be transmitted based on, the one CDMA wireless communication device transmits the transmission power control bits as a bit pattern in which the number of bits “0” and the number of bits “1” are equal, The other CDMA wireless communication apparatus determines whether the received command is a UP command or a DOWN command by correlating the bit pattern of the received transmission power control bit with a previously prepared bit pattern.

  According to this method, transmission power control bit reception processing can be performed with less influence of interference waves without increasing the amount of processing even when downlink reception quality or uplink reception quality is poor. Control information reception determination performance can be improved.

  When the CDMA base station apparatus according to the present invention transmits PI data for controlling incoming / outgoing calls in the CDMA mobile station apparatus, the PI data corresponding to incoming / outgoing calls is transmitted with a bit “0” for each fixed period. "And the bit" 1 "are configured to include a means for generating a bit pattern in which the bit" 1 "is alternately switched.

  According to this configuration, PI data for controlling incoming / outgoing calls at the CDMA mobile station apparatus can be transmitted in a format that allows reception processing with less influence of interference waves without increasing the amount of processing. it can.

  The CDMA mobile station apparatus according to the present invention decodes bits of a bit pattern in which bit “0” and bit “1” are alternately switched every fixed period of received PI data for controlling incoming / outgoing calls. A configuration is provided that includes a means for switching each time and determining whether or not there is an incoming call.

  According to this configuration, even when the downlink reception quality is poor, the CDMA mobile station apparatus can perform the PI data reception determination by reducing the influence of the interference wave without increasing the processing amount.

  The CDMA base station apparatus according to the present invention, when the downlink format for transmitting the PI data for controlling the incoming / outgoing in the CDMA mobile station apparatus can transmit a plurality of bits collectively, the PI corresponding to the incoming and the non-incoming A configuration is employed that includes means for generating data as a bit pattern in which the number of bits “0” is equal to the number of bits “1”.

  According to this configuration, PI data for controlling incoming / outgoing calls at the CDMA mobile station apparatus can be transmitted in a format that allows reception processing with less influence of interference waves without increasing the amount of processing. it can.

  The CDMA mobile station apparatus according to the present invention correlates a bit pattern in which the number of bits “0” and the number of bits “1” of received PI data for controlling incoming / outgoing calls are equal to a bit pattern prepared in advance. And adopting a configuration including means for determining whether or not there is an incoming call.

  According to this configuration, even when the downlink reception quality is poor, the CDMA mobile station apparatus can perform the PI data reception determination by reducing the influence of the interference wave without increasing the processing amount.

  In the CDMA radio communication method according to the present invention, the CDMA base station device transmits PI data for controlling incoming / outgoing calls as a bit pattern in which bit “0” and bit “1” are alternately switched at regular intervals. The CDMA mobile station apparatus that receives the PI data switches the decoding of the bits of the received PI data at regular intervals to determine whether there is an incoming call.

  According to this method, even when the reception quality of the PI data is poor, it is possible to reduce the influence of the interference wave without increasing the processing amount, thereby improving the PI data reception determination performance. be able to.

  In the CDMA radio communication method according to the present invention, the CDMA base station device transmits PI data for controlling incoming / outgoing calls as a bit pattern in which the number of bits “0” and the number of bits “1” are equal, The CDMA mobile station apparatus that receives the PI data determines whether or not there is an incoming call by correlating the bit pattern of the received PI data with a bit pattern prepared in advance.

  According to this method, even when the reception quality of the PI data is poor, it is possible to reduce the influence of the interference wave without increasing the processing amount, thereby improving the PI data reception determination performance. be able to.

  According to the present invention, even when downlink reception quality or uplink reception quality is poor, the influence of interference waves can be reduced without increasing the amount of processing in reception of transmission power control information. Judgment performance can be improved.

  In addition, according to the present invention, even when the downlink reception quality is poor, the influence of interference waves can be reduced without increasing the amount of processing in PI data reception, so that the PI data reception determination performance can be improved. Can do.

  The essence of the present invention is that the bit pattern of the TPC bit for transmission power control corresponding to the UP command and the DOWN command is switched at regular intervals, or when the slot format capable of transmitting a plurality of bits is used, the bit pattern of the TPC bit is changed to the bit pattern. By generating the number of “0” s equal to the number of bits “1”, even when downlink reception quality or uplink reception quality is poor, transmission is performed with less influence of interference waves without increasing the amount of reception processing. It is to enable reception determination of the power control TPC bit.

  In addition, the gist of the present invention transmits PI data corresponding to incoming and non-incoming as a bit pattern in which bit “0” and bit “1” are periodically switched in transmission / reception of PI data using PICH. Alternatively, when a downlink format capable of transmitting a plurality of bits is used, transmission is performed as a bit pattern in which the number of bits “0” is equal to the number of bits “1”, thereby increasing the amount of processing even when the downlink reception quality is poor. In other words, it is possible to reduce the influence of the interference wave and perform the PI data reception determination.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
The first embodiment relates to a TPC bit transmission / reception method (part 1) that is a transmission power control command. Although the uplink transmission power control will be described, the downlink transmission power control can be similarly implemented.

  FIG. 1 is a block diagram showing a configuration of a CDMA base station apparatus that is a CDMA radio communication apparatus according to Embodiment 1 of the present invention. A CDMA base station apparatus 100 shown in FIG. 1 includes a reception antenna 101 that receives an uplink signal, a reception radio unit 102 that amplifies the reception signal input from the reception antenna 101 and down-converts the signal to a baseband signal, and a reception radio. An A / D converter 103 that converts the received signal output from the unit 102 into a digital signal, a despreading unit 104 that despreads the output of the A / D converter 103, and a despread signal output from the despreading unit 104 Phase estimation unit 105 that performs phase estimation, synchronous detection unit 106 that performs synchronous detection of a despread signal output from despreading unit 104 using the phase estimation value output from phase estimation unit 105, and output from synchronous detection unit 106 A decoder unit 107 that decodes the synchronous detection data and outputs received data.

  In addition, the CDMA base station apparatus 100 shown in FIG. 1 includes an ISCP calculation unit 108 that measures interference signal received power (ISCP) from a despread signal output from the despreading unit 104, and a despreading unit 104. An RSCP calculation unit 109 that measures a received signal received power (RSCP: Received Signal Code Power) from an output despread signal, and an SIR calculation that obtains a received SIR that is a ratio of the measured desired wave received power and interference wave received power Unit 110, and an uplink transmission power control bit generation unit 111 that receives a measurement SIR output from SIR calculation unit 110 and a slot number, for example, and generates an uplink transmission power control TPC as described later.

  The CDMA base station apparatus 100 shown in FIG. 1 encodes downlink transmission data input from the outside, and inserts the TPC bit generated by the uplink transmission power control bit generation unit 111 into the encoder unit 112 that generates a transmission frame. A spreader 113 that spreads the frame signal output from the encoder 112, a D / A converter 114 that converts the spread data output from the spreader 113 into an analog signal, and amplifies the converted analog signal, A transmission radio unit 115 that up-converts the signal to a frequency transmission signal, and a transmission antenna 116 that transmits the transmission signal output from the transmission radio unit 115 to the downlink.

  FIG. 2 is a block diagram illustrating a configuration example of the uplink transmission power control bit generation unit 111 illustrated in FIG. In FIG. 2, an uplink transmission power control bit generation unit 111 generates a TPC bit from a comparison unit 200 that compares an SIR measurement value with a target SIR value, a comparison result in the comparison unit 200, and information on a slot number, for example. And a TPC generation unit 201.

  Next, FIG. 3 is a block diagram showing a configuration of a CDMA mobile station apparatus that is a CDMA radio communication apparatus according to Embodiment 1 of the present invention. A CDMA mobile station apparatus 300 shown in FIG. 3 includes a reception antenna 301 that receives a downlink signal, a reception radio unit 302 that amplifies the reception signal input from the reception antenna 301 and down-converts the signal to a baseband signal, and a reception radio. An A / D converter 303 that converts the received signal output from the unit 302 into a digital signal, a despreading unit 304 that despreads the output of the A / D converter 303, and a despread signal output from the despreading unit 304 A phase estimation unit 305 that performs phase estimation, a synchronous detection unit 306 that performs synchronous detection of a despread signal output from the despreading unit 304 using the phase estimation value output from the phase estimation unit 305, and an output from the synchronous detection unit 306 A decoder unit 307 that decodes the synchronous detection data and outputs received data.

  3 includes a TPC synchronous detector 308 that demodulates a TPC bit from the despread signal output from the despreader 304, and a TPC bit reception result in the TPC synchronous detector 308, for example. An uplink transmission power control unit 309 that receives the slot number, determines uplink transmission power, and outputs an uplink transmission power control signal, as will be described later, is provided.

  The CDMA mobile station apparatus 300 shown in FIG. 3 includes an encoder unit 310 that encodes uplink transmission data input from the outside, a spreading unit 311 that spreads an encoded signal output from the encoder unit 310, and a spreading unit 311. A D / A converter 312 that converts the spread data to be output into an analog signal, a transmission radio unit 313 that amplifies the converted analog signal and up-converts it to a radio frequency transmission signal, and the transmission radio unit 313 has an upstream transmission power. And a transmission antenna 314 that transmits a transmission signal output with power according to the uplink transmission power control signal from the control unit 309 to the uplink.

  FIG. 4 is a block diagram illustrating a configuration example of the uplink transmission power control unit 309 illustrated in FIG. In FIG. 4, the uplink transmission power control unit 309 includes a TPC decoder unit 400 that determines an uplink transmission power command from the received TPC bit demodulation result and, for example, slot number information.

  Next, with reference to FIG. 1 to FIG. 5, an operation of uplink transmission power control performed in the CDMA radio communication apparatus according to the first embodiment configured as described above will be described. FIG. 5 is a diagram for explaining a bit pattern of uplink transmission power control bits transmitted and received between the CDMA base station apparatus 100 shown in FIG. 1 and the CDMA mobile station apparatus 300 shown in FIG.

  In uplink transmission power control bit generation section 111 of CDMA base station apparatus 100, in FIG. 2, comparison section 200 compares the magnitude relationship between the SIR measurement value and the target SIR value, and the SIR measurement value is less than the target SIR. Generates an UP command that instructs the mobile station to increase the transmission power, and conversely generates a DOWN command that instructs the mobile station to decrease the transmission power when the SIR measurement value is equal to or greater than the target SIR. .

  The TPC generation unit 201 generates a TPC bit that is a transmission power control command corresponding to an UP command and a DOWN command mapped to a bit pattern of “0” and “1” from the UP command or DOWN command output from the comparison unit 200 To do. At this time, as shown in FIG. 5, for example, TPC bits are generated that are mapped so that bit “0” and bit “1” are alternately switched for each slot. The TPC bits of such a bit pattern are output to the encoder unit 112.

  On the other hand, in uplink transmission power control section 309 in CDMA mobile station apparatus 300, in FIG. 4, in the TPC decoder section, the value of the TPC bit (TPC demodulation result) extracted by the TPC synchronous detection section from the downlink signal and the slot number information The bit pattern is interpreted to determine whether the command is an UP command or a DOWN command. At this time, the correspondence between the slot number and the bits “0” and “1” must be the same as that of the CDMA base station apparatus 100. Then, uplink transmission power control section 309 determines an uplink transmission power value based on the UP / DOWN determination result, and controls transmission radio section 313.

  Here, the switching of the TPC bit pattern has been described as being performed for each slot using the slot number, but is not limited to the slot number. For example, when the number of slots per frame is an odd number, it is necessary to consider the frame number.

  Further, the switching period of the TPC bits is not limited to the slot, and may be, for example, every period of the spreading code to be used. As a result, a switching cycle can be set in accordance with the interference generation cycle.

  As described above, according to the first embodiment, the transmission power control TPC bit corresponding to the UP command and the DOWN command is a bit pattern in which the bit “0” and the bit “1” are periodically switched. Even when the downlink reception quality is poor, it is possible to determine the TPC bit for transmission power control while reducing the influence of the interference wave without increasing the processing amount.

  In the above description, the 3GPP standard is described, but the present invention can be similarly applied to other systems.

(Embodiment 2)
The second embodiment relates to a TPC bit transmission / reception method (part 2) which is a transmission power control command. In addition, although uplink transmission power control is demonstrated, the point which can be similarly implemented about downlink transmission power control is the same as that of Embodiment 1.

  FIG. 6 is a block diagram showing a configuration of a CDMA base station apparatus which is a CDMA radio communication apparatus according to Embodiment 2 of the present invention. FIG. 7 is a block diagram showing a configuration of a CDMA mobile station apparatus that is a CDMA radio communication apparatus according to Embodiment 2 of the present invention. 6 and 7, the same reference numerals are given to the same or equivalent components as those shown in the first embodiment (FIGS. 1 and 3). Here, the description will be focused on the portion related to the second embodiment.

  As shown in FIG. 6, in CDMA base station apparatus 600 according to Embodiment 2, in the configuration shown in Embodiment 1 (FIG. 1), uplink transmission power control is performed instead of uplink transmission power control bit generation section 111. A bit generation unit 601 is provided. The uplink transmission power control bit generation unit 601 includes the comparison unit and the TPC generation unit illustrated in FIG. 2, but the TPC generation unit according to the second embodiment is different from the TPC generation unit 201 illustrated in FIG. 2. A TPC bit is generated.

  Also, as shown in FIG. 7, in CDMA mobile station apparatus 700 according to Embodiment 2, in the configuration shown in Embodiment 1 (FIG. 3), uplink transmission power control is performed instead of uplink transmission power control section 309. A part 701 is provided. Uplink transmission power control section 701 includes the TPC decoding section shown in FIG. 4, but the TPC decoding section according to Embodiment 2 determines the TPC demodulation result by a method different from TPC decoder section 400 shown in FIG. It is like that.

  Next, with reference to FIGS. 6 to 8, the operation of uplink transmission power control performed in the CDMA radio communication apparatus according to the first embodiment configured as described above will be described. FIG. 8 is a diagram for explaining a bit pattern of uplink transmission power control bits transmitted and received between the CDMA base station apparatus 600 shown in FIG. 6 and the CDMA mobile station apparatus 700 shown in FIG.

  The second embodiment relates to a slot format in which a plurality of TPC bits are transmitted in one slot. In this case, the uplink transmission power control bit generation unit 601 of the CDMA base station apparatus 600 has a transmission power having a bit pattern in which the number of bits “0” and bits “1” are equal, as shown in FIG. 8, for example. A TPC bit which is a control command is generated.

  On the other hand, the uplink transmission power control section 701 in the CDMA mobile station apparatus 700 calculates the correlation between the received TPC bit that is the TPC demodulation result and the bit pattern prepared in advance, and determines whether it is an UP command or a DOWN command from the correlation value. Determine if there is.

  As described above, according to the second embodiment, in the case of a slot format in which a plurality of TPC bits are transmitted in one slot, the transmission power control TPC bits corresponding to the UP command and the DOWN command are converted into the bit “ Since the bit pattern has the same number of “0” and bit “1”, even when the downlink reception quality is poor, the influence of the interference wave can be reduced without increasing the processing amount, and the TPC bit for transmission power control can be determined. It becomes like this.

(Embodiment 3)
The third embodiment relates to a method (part 1) of transmitting and receiving PI data using PICH for controlling incoming / outgoing calls at a CDMA mobile station apparatus. Here, a CDMA base station apparatus will be described.

  FIG. 9 is a block diagram showing a configuration of a CDMA base station apparatus according to Embodiment 3 of the present invention. CDMA base station apparatus 900 according to the third embodiment shown in FIG. 9 receives an externally input PICH transmission data and, for example, a slot number, and creates a frame signal including PI data having a bit pattern having the contents described later. 901, a spreader 902 that spreads the frame signal output from the encoder 901, a D / A converter 903 that converts the spread data output from the spreader 902 into an analog signal, and amplifies the converted analog signal A transmission radio unit 904 for up-converting to a radio frequency transmission signal, and a transmission antenna 905 for transmitting the transmission signal output from the transmission radio unit 904 to the downlink.

  Next, with reference to FIG. 9 and FIG. 10, the PI data transmission operation performed in the CDMA base station apparatus 900 according to the third embodiment configured as described above will be described. FIG. 10 is a diagram for explaining a bit pattern of PI data transmitted by the CDMA base station apparatus shown in FIG.

  When the encoder unit 901 generates a frame signal from externally input PICH transmission data, as shown in FIG. 10, PI data corresponding to incoming and non-incoming, for example, bit number “ A bit pattern in which “0” and bit “1” are alternately switched is generated.

  FIG. 10 shows a case where the PI data has a 4-bit configuration. The “incoming” PI data is switched to “0000”, “1111”, “0000”, and “1111” for each slot. On the other hand, the PI data of “no incoming call” is switched to “1111”, “0000”, “1111”, and “0000” for each slot, contrary to “incoming call”.

  In a CDMA mobile station apparatus (not shown), the presence or absence of an incoming call is determined by switching the decoding of the received PI data for each slot, such as every slot.

  The period to be changed need not be a slot period, but may be a frame period or an SFN (System Frame Number) period. In short, the bit pattern is switched at a constant cycle.

  Thus, according to the third embodiment, in the CDMA base station apparatus, the PI data corresponding to incoming and non-incoming is periodically converted into a bit pattern in which bit “0” and bit “1” are switched. Since the transmission is performed, the CDMA mobile station apparatus that receives the received signal can perform the PI bit determination process by reducing the influence of the interference wave without increasing the processing amount even when the downlink reception quality is poor. Can be improved.

(Embodiment 4)
The fourth embodiment relates to a method (part 2) for transmitting and receiving PI data using PICH for controlling incoming / outgoing calls in a CDMA mobile station apparatus. Here, a CDMA base station apparatus will be described.

  FIG. 11 is a block diagram showing a configuration of a CDMA base station apparatus according to Embodiment 4 of the present invention. In FIG. 11, the same reference numerals are given to components that are the same as or equivalent to those shown in FIG. 9 (Embodiment 3). Here, the description will be focused on the portion related to the fourth embodiment.

  As shown in FIG. 11, in CDMA base station apparatus 1100 according to Embodiment 4, encoder 1101 is provided in place of encoder 901 in the configuration shown in FIG. 9 (Embodiment 3). .

  Next, with reference to FIG. 11 and FIG. 12, the PI data transmission operation performed in CDMA base station apparatus 1100 according to the fourth embodiment configured as described above will be described. FIG. 12 is a diagram for explaining a bit pattern of PI data transmitted by the CDMA base station apparatus shown in FIG.

  The fourth embodiment relates to the case of a downlink format that can transmit multiple bits of PI data. In this case, when the encoder unit 1101 generates the frame signal from the PICH transmission data input from the outside, as shown in FIG. Is generated as a bit pattern in which the number of bits “0” is equal to the number of bits “1”.

  FIG. 12 shows a case where the PI data has a 4-bit configuration. The PI data of “incoming call” is “1100”. On the other hand, the PI data of “no incoming call” is “0011”, contrary to “with incoming call”.

  A CDMA mobile station device (not shown) calculates the correlation between the bit pattern of the received PI data and the bit pattern prepared in advance, and determines whether there is an incoming call from the correlation value.

  Thus, according to the fourth embodiment, the CDMA base station apparatus transmits PI data corresponding to incoming and non-incoming as a bit pattern in which the number of bits “0” is equal to the number of bits “1”. Therefore, in the CDMA mobile station apparatus that receives it, even if the downlink reception quality is poor, it is possible to solve the problem of an increase in the erroneous determination probability of PI bits due to the influence of interference waves without increasing the amount of processing. And the incoming call performance can be improved.

  The CDMA wireless communication apparatus and the CDMA wireless communication method according to the present invention are suitable for improving the transmission power control bit and PI data reception determination performance in a poor reception environment.

1 is a block diagram showing a configuration of a CDMA base station apparatus that is a CDMA radio communication apparatus according to Embodiment 1 of the present invention. The block diagram which shows the structural example of the uplink transmission power control bit production | generation part shown in FIG. 1 is a block diagram showing a configuration of a CDMA mobile station apparatus that is a CDMA radio communication apparatus according to Embodiment 1 of the present invention. The block diagram which shows the structural example of the uplink transmission power control part shown in FIG. The figure explaining the bit pattern of the uplink transmission power control bit transmitted / received between the CDMA base station apparatus shown in FIG. 1 and the CDMA mobile station apparatus shown in FIG. Block diagram showing the configuration of a CDMA base station apparatus which is a CDMA radio communication apparatus according to Embodiment 2 of the present invention. Block diagram showing a configuration of a CDMA mobile station apparatus which is a CDMA radio communication apparatus according to Embodiment 2 of the present invention. The figure explaining the bit pattern of the uplink transmission power control bit transmitted / received between the CDMA base station apparatus shown in FIG. 6 and the CDMA mobile station apparatus shown in FIG. Block diagram showing the configuration of a CDMA base station apparatus according to Embodiment 3 of the present invention The figure explaining the bit pattern of PI data which the CDMA base station apparatus shown in FIG. 9 transmits Block diagram showing the configuration of a CDMA base station apparatus according to Embodiment 4 of the present invention. The figure explaining the bit pattern of PI data which the CDMA base station apparatus shown in FIG. 11 transmits Constellation diagram explaining the transition of received signal points when reception quality is poor

Explanation of symbols

100, 600 CDMA base station apparatus (CDMA wireless communication apparatus)
DESCRIPTION OF SYMBOLS 101 Reception antenna 102 Reception radio | wireless part 103 A / D converter 104 Despreading part 105 Phase estimation part 106 Synchronous detection part 107 Decoder part 108 ISCP calculation part 109 RSCP calculation part 110 SIR calculation part 111,601 Uplink transmission power control bit generation part DESCRIPTION OF SYMBOLS 112 Encoder part 113 Spreading part 114 D / A converter 115 Transmission radio | wireless part 116 Transmission antenna 200 Comparison part 201 TPC generation part 300, 700 CDMA mobile station apparatus (CDMA radio | wireless communication apparatus)
301 reception antenna 302 reception radio unit 303 A / D converter 304 despreading unit 305 phase estimation unit 306 synchronous detection unit 307 decoder unit 308 TPC synchronous detection unit 309, 701 uplink transmission power control unit 310 encoder unit 311 spreading unit 312 D / A converter 313 Transmission radio unit 314 Transmission antenna 400 TPC decoder unit 900, 1100 CDMA base station apparatus 901, 1101 Encoder unit 902 Spreading unit 903 D / A converter 904 Transmission radio unit 905 Transmission antenna

Claims (12)

  Means for generating transmission power control bits corresponding to an UP command and a DOWN command transmitted to the other CDMA wireless communication apparatus as a bit pattern in which bit “0” and bit “1” are alternately switched at regular intervals. A CDMA wireless communication apparatus comprising:   When controlling the transmission power to be transmitted based on the received transmission power control bit, interprets the bit pattern in which the bit “0” and the bit “1” are alternately switched every predetermined period of the received transmission power control bit. And a means for determining whether the command is an UP command or a DOWN command.   When the slot format for transmitting the transmission power control bits corresponding to the UP command and the DOWN command to the other CDMA wireless communication apparatus can transmit a plurality of bits collectively, the transmission power control bit is set to bit “0”. And a means for generating a bit pattern in which the number of bits and the number of bits “1” are equal to each other.   When controlling the transmission power to be transmitted based on the received transmission power control bits, a bit pattern in which the number of bits “0” and the number of bits “1” of the received transmission power control bits are equal is prepared in advance. And a means for determining whether the command is an UP command or a DOWN command by correlating with the bit pattern.   When one CDMA radio communication apparatus transmits a transmission power control bit corresponding to an UP command and a DOWN command, and the other CDMA radio communication apparatus controls transmission power to be transmitted based on the transmission power control bit received The one CDMA wireless communication apparatus transmits the transmission power control bit as a bit pattern in which a bit “0” and a bit “1” are alternately switched at regular intervals, and the other CDMA wireless communication apparatus A CDMA wireless communication method characterized by interpreting a bit pattern of the received transmission power control bit and determining whether it is an UP command or a DOWN command.   When one CDMA radio communication apparatus transmits a transmission power control bit corresponding to an UP command and a DOWN command, and the other CDMA radio communication apparatus controls transmission power to be transmitted based on the transmission power control bit received The one CDMA radio communication apparatus transmits the transmission power control bits as a bit pattern in which the number of bits “0” and the number of bits “1” are equal, and the other CDMA radio communication apparatus receives A CDMA wireless communication method, wherein a correlation between a bit pattern of the transmission power control bit and a bit pattern prepared in advance is taken to determine whether the command is an UP command or a DOWN command.   When transmitting PI data for controlling incoming / outgoing calls in the CDMA mobile station apparatus, the bit data “0” and bit “1” are alternately shown in the PI data corresponding to incoming / outgoing calls at regular intervals. A CDMA base station apparatus comprising: means for generating a bit pattern to be switched.   Check whether or not there is an incoming call by switching the bit pattern bit that alternates between bit “0” and bit “1” at regular intervals of PI data that controls incoming / outgoing incoming calls. A CDMA mobile station apparatus.   When the downlink format for transmitting PI data for controlling incoming / non-incoming calls at the CDMA mobile station apparatus can transmit a plurality of bits collectively, the PI data corresponding to incoming and non-incoming numbers is set to the number of bits “0” and the bit A CDMA base station apparatus comprising: means for generating bit patterns in which the number of “1” s is equal.   Means for determining presence / absence of an incoming call by correlating a bit pattern in which the number of bits “0” and the number of bits “1” of PI data for controlling incoming / outgoing incoming calls are equal to each other. A CDMA mobile station apparatus comprising:   A CDMA base station apparatus transmits PI data for controlling incoming / outgoing calls as a bit pattern in which bit “0” and bit “1” are alternately switched at regular intervals, and receives the PI data. A CDMA wireless communication method, wherein the apparatus determines whether or not there is an incoming call by switching the decoding of the bits of the received PI data at regular intervals.   The CDMA base station apparatus transmits PI data for controlling incoming / outgoing calls as a bit pattern in which the number of bits “0” and the number of bits “1” are equal, and the CDMA mobile station apparatus that receives the PI data A CDMA wireless communication method, wherein the presence / absence of an incoming call is determined by correlating a bit pattern of received PI data with a bit pattern prepared in advance.

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