JP2006109519A - Mobile station device and receiving method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile station device in which a wasteful power consumption is suppressed by efficiently performing reception process. <P>SOLUTION: A signaling detector 71 detects a gap section of compressed mode of an upstream line, in other words, a section where an upstream line signal is not transmitted to a base station, from the signaling contained in DPCH after despreading, and informs a control unit 72 of the section. The control unit 72 controls a HS-PDSCH reception process part 40 so as to stop the reception process of packet data corresponding to ACK signal/NACK signal when the section detected by the signaling detector 71 contains transmission timing of the ACK signal/NACK signal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mobile station apparatus and a reception method in the mobile station apparatus.

Currently, in a mobile communication system, HSDPA (High Speed Downlink Packet Access) technology for data transmission between a mobile station apparatus (hereinafter abbreviated as a mobile station) and a base station apparatus (hereinafter abbreviated as a base station). Various studies have been conducted on the application of. HSDPA is a technique for standardization is underway in the ^{3GPP (3 rd Generation Partnership Project)} . In HSDPA, by using adaptive modulation, H-ARQ (Hybrid Automatic Repeat reQuest), high-speed selection of a destination mobile station, adaptive control of transmission parameters according to the state of the radio link, etc., the downlink from the base station to the mobile station is used. Increases the throughput of the line.

  As main channels used in HSDPA, HS-SCCH (Shared Control Channel for HS-DSCH, HS-DSCH: High Speed Downlink Shared Channel), HS-PDSCH (High Speed Physical Downlink Shared Channel), and HS-DPCCH (Dedicated Physical Channel) Control Channel (uplink) for HS-DSCH). HS-SCCH is a downlink control channel composed of sub-frames consisting of 3 slots. From the base station to the mobile station via HS-SCCH, the HS-PDSCH modulation scheme, the number of multicodes, and the transport block size Control information indicating, etc. is transmitted. The HS-PDSCH is a downlink data channel for transmitting packet data, which is composed of 3 slots of subframes. The HS-DPCCH is an uplink control channel configured by a sub-frame having 3 slots and transmitting a feedback signal related to the HS-PDSCH. In the HS-DPCCH subframe, an H-ARQ ACK (ACKnowledgment) signal / NACK (Negative ACKnowledgment) signal is transmitted in the first slot, and a downlink CQI is transmitted in the second and third slots. (Channel Quality Indicator: transmission quality report value) is transmitted. For the H-ARQ ACK signal / NACK signal, if there is no error in the decoding result of the HS-PDSCH corresponding to the HS-DPCCH, the ACK signal is OK, and if there is an error, the NACK signal is used for HSDPA service. It is transmitted to the base station of the cell to be provided (HSDPA serving cell). The CQI is used to report the downlink transmission quality in the quality measurement interval (Reference Measurement Period) to the base station of the HSDPA serving cell, and is usually indicated by a number corresponding to the transmission quality. It shows a combination of a modulation method and a coding rate that can be demodulated by the mobile station in terms of quality. The base station performs scheduling based on the CQI to determine a mobile station that is a transmission destination of the HS-PDSCH, and transmits HS-PDSCH packet data to the mobile station at a transmission rate based on the CQI. The configuration of each of these channels is described in Non-Patent Document 1, for example.

Hereinafter, conventional HS-PDSCH reception processing in a mobile station will be described.
(1) The mobile station receives and monitors the HS-SCCH set indicated by the higher layer. The HS-SCCH set includes a plurality of HS-SCCHs, and the mobile station monitors whether there is an HS-SCCH addressed to itself in these HS-SCCHs. When there are a plurality of mobile stations in the HSDPA serving cell, each HS-SCCH in the HS-SCCH set also encodes and transmits information indicating which mobile station each HS-SCCH is addressed. The mobile station can detect the HS-SCCH addressed to itself from the received plurality of HS-SCCHs.
(2) When the mobile station detects the HS-SCCH addressed to itself from the HS-SCCH set, the mobile station starts receiving the HS-PDSCH indicated by the control information transmitted on the HS-SCCH. If the HS-SCCH addressed to itself is not detected, the mobile station does not receive the HS-PDSCH. In addition to the information on which mobile station the HS-SCCH is destined for, the control information includes HS-PDSCH modulation scheme, the number of multicodes, and the transport block size as information necessary for receiving the HS-PDSCH. Etc. are included.
(3) The mobile station performs demodulation, decoding, and error detection (CRC: Cyclic Redundancy Check) on the received HS-PDSCH.
(4) As a result of error detection, the mobile station transmits an ACK signal to the base station of the HSDPA serving cell as a response signal for error detection if there is no error and is OK and the error is NG. At this time, the mobile station repeatedly transmits the ACK signal / NACK signal for the number of times specified by signaling (N # acknack # transmit) from the higher layer. Note that H-ARQ is used in HSDPA as the ARQ scheme. The mobile station reception processing as described above is described in Non-Patent Document 2, for example.
3GPP TS 25.211 V5.4.0 (3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical channels and mapping of transport channels onto physical channels (FDD) (Release 5)) 3GPP TS 25.214 V5.5.0 (3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical layer procedures (FDD) (Release 5))

  Here, signaling from the upper layer to the mobile station receiving the HSDPA service includes the compressed mode gap timing (start timing and gap length), switching of the HSDPA serving cell, in addition to the number of repeated transmissions of the ACK signal / NACK signal. The timing, the switching timing of the transmission diversity mode of the base station of the HSDPA serving cell, and the like are targeted.

  In the conventional mobile station, although these signalings are detected, HS-SCCH and HS-PDSCH are received and ACK signals / NACK signals are transmitted without considering this signaling information. The efficiency was poor and as a result, wasted power was consumed.

  The present invention has been made in view of this point, and an object of the present invention is to provide a mobile station apparatus and a reception method in the mobile station apparatus that can efficiently perform reception processing and suppress unnecessary power consumption.

  A mobile station apparatus according to the present invention includes: a first receiving unit that performs a first reception process including demodulation, decoding, and error detection of a downlink data channel; and a downlink control channel that transmits control information necessary for receiving the downlink data channel Second receiving means for performing a second receiving process including demodulation and decoding of the above, a transmitting means for transmitting a response signal for error detection in the first receiving means to the base station apparatus via an uplink control channel, and the response signal And a control unit that stops at least one of the first reception process, the second reception process, and the transmission process of the response signal in the transmission unit based on the transmission timing.

  According to this configuration, at least one of the first reception process, the second reception process, and the response signal transmission process is stopped based on the transmission timing of the response signal (ACK signal / NACK signal). In addition, transmission processing can be performed efficiently.

  ADVANTAGE OF THE INVENTION According to this invention, the useless power consumption of a mobile station apparatus can be suppressed.

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

(Embodiment 1)
As described above, signaling for notifying the compressed mode gap timing is performed from the upper layer to the mobile station. Here, the compressed mode refers to a method in which a predetermined empty section (gap section) is provided between slots or frames by temporarily lowering the spreading factor. In the uplink compressed mode gap section, the base station does not receive the uplink signal from the mobile station to which the DPCH is assigned, and therefore the mobile station does not transmit the uplink signal to the base station. Therefore, in HSDPA, in the uplink compressed mode gap section, the base station of the HSDPA serving cell does not receive the HS-DPCCH from the mobile station to which the DPCH is assigned, so the mobile station transmits an ACK signal on the HS-DPCCH. / NACK signal is not transmitted.

  Here, if the base station of the HSDPA serving cell does not receive an ACK signal / NACK signal for the packet data from the mobile station even after a predetermined time has elapsed after transmitting the packet data on the HS-PDSCH, The packet data is retransmitted on the assumption that a packet loss has occurred. H-ARQ is used as the retransmission method. As described above, since the ACK signal / NACK signal is not transmitted on the HS-DPCCH in the compressed mode gap section on the uplink, the base station of the HSDPA serving cell retransmits the packet data to the mobile station. To do. Therefore, even if the mobile station loses packet data that does not transmit an ACK signal / NACK signal, the packet data is retransmitted, so there is no particular problem in terms of packet loss. Therefore, in the mobile station according to the present embodiment, the packet data reception process that does not transmit the ACK signal / NACK signal is stopped in the first place to reduce power consumption. Hereinafter, the mobile station according to the present embodiment will be described.

  FIG. 1 is a block diagram showing a configuration of a mobile station according to Embodiment 1 of the present invention. In the mobile station shown in FIG. 1, the signal transmitted from the base station is received by the receiving unit 30 via the antenna 10 and the duplexer 20, and the receiving unit 30 performs a predetermined conversion such as down-conversion on the received signal. Apply wireless processing. The received signal after radio processing is input to the HS-PDSCH reception processing unit 40, the HS-SCCH reception processing unit 50, the CPICH (Common Pilot Channel) despreading unit 60, and the DPCH despreading unit 70, respectively. The received signal includes an HS-PDSCH signal, an HS-SCCH signal, a CPICH signal, and a DPCH signal.

  The HS-SCCH reception processing unit 50 includes a despreading unit 501, a demodulation unit 502, a decoding unit 503, and a determination unit 504, and performs reception processing on the HS-SCCH transmitted from the base station. In HS-SCCH, a plurality of HS-SCCHs constitute one set (HS-SCCH set). In addition, in each HS-SCCH, in addition to information about which mobile station each HS-SCCH is addressed to, the HS-PDSCH modulation scheme as information necessary for receiving packet data transmitted on the HS-PDSCH Control information including the number of multicodes, transport block size, etc. is transmitted. Despreading section 501 performs despreading with a predetermined spreading code for each HS-SCCH included in the HS-SCCH set. Each HS-SCCH after despreading is demodulated by demodulation section 502, decoded by decoding section 503, and the decoding result is input to determination section 504. Based on the input decoding result, the determination unit 504 determines whether there is an HS-SCCH addressed to itself in a plurality of HS-SCCHs included in the HS-SCCH set. As a result of the determination, if there is an HS-SCCH addressed to the own station, the determining unit 504 modulates the spreading code information such as the number of multicodes indicated by the control information of the HS-SCCH addressed to the own station to the despreading unit 401. The modulation scheme information such as the scheme is sent to the demodulation section 402, and the encoded information such as the transport block size is sent to the decoding section 403.

  The HS-PDSCH reception processing unit 40 includes a despreading unit 401, a demodulation unit 402, a decoding unit 403, and an error detection unit 404, and performs reception processing on the HS-PDSCH transmitted from the base station. In HS-PDSCH, packet data composed of information bits is transmitted. The despreading unit 401 performs despreading on the HS-PDSCH based on the spreading code information instructed from the determination unit 504. The HS-PDSCH after despreading is demodulated by the demodulation unit 402 based on the modulation scheme information instructed by the determination unit 504, decoded by the decoding unit 403 based on the encoded information instructed by the determination unit 504, and decoded. The result (packet data) is input to the error detection unit 404. The error detection unit 404 performs error detection such as CRC on the input packet data. Then, the error detection unit 404 creates an ACK signal or a NACK signal based on the error detection result and inputs it to the transmission unit 80. The error detection unit 404 creates an ACK signal as a response signal for error detection when the packet data has no error and is OK, and when there is an error, and inputs it to the transmission unit 80. The transmission unit 80 transmits an ACK signal / NACK signal to the base station via the HS-DPCCH under the control of the control unit 72.

  The CPICH despreading unit 60 performs despreading on the CPICH with a predetermined spreading code. In CPICH, a pilot signal is transmitted. The CPICH after despreading is input to the SIR measurement unit 61. The SIR measurement unit 61 measures SIR (Signal to Interference Ratio) as the reception quality of the pilot signal, and inputs the measured SIR value to the CQI selection unit 62. The CQI selection unit 62 has a table in which a plurality of CQIs are set in association with a plurality of SIR values, and selects a CQI corresponding to the SIR value input from the SIR measurement unit 61 with reference to the table. The selected CQI is input to the transmission unit 80. Since the reception SIR value of the pilot signal represents downlink transmission quality, the CQI corresponding to the higher transmission rate is selected as the SIR value is larger. The transmission unit 80 transmits the input CQI to the base station via the HS-DPCCH.

  The DPCH despreading unit 70 performs despreading on the DPCH with a predetermined spreading code. In DPCH, signaling from an upper layer is transmitted. With this signaling, the mobile station repeats the number of ACK / NACK signal transmissions, uplink compressed mode gap timing (start timing and gap length), HSDPA serving cell switching timing, and HSDPA serving cell base station transmission diversity. The mode switching timing and the like are notified. The DPCH after despreading is input to the signaling detection unit 71, and the signaling detection unit 71 uses the signaling included in the DPCH after despreading to transmit the uplink compressed mode gap section, that is, the uplink signal to the base station. A section that is not transmitted is detected, and the control section 72 is notified of the section.

  If the transmission timing of the ACK signal / NACK signal is included in the section detected by the signaling detection unit 71, the control unit 72 stops the reception processing for the packet data corresponding to the ACK signal / NACK signal. The PDSCH reception processing unit 40 is controlled. That is, the control unit 72 stops the reception process of the HS-PDSCH subframe that transmits the packet data corresponding to the ACK signal / NACK signal. Further, when packet data is not received, HS-SCCH control information for the packet data is not necessary, and therefore the control unit 72 performs control necessary for the packet data reception process for which reception processing is stopped. The HS-SCCH reception processing unit 50 is controlled to stop the reception processing for information. That is, the control unit 72 also stops the reception processing of the HS-SCCH subframe that transmits the control information.

  In stopping the reception process, the HS-PDSCH reception processing unit 40 may stop all processes of despreading, demodulation, decoding, and error detection, or any one or more of them may be stopped. . Similarly, all processes of despreading, demodulation, decoding, and determination may be stopped in the HS-SCCH reception processing unit 50, or any one or more of them may be stopped. Furthermore, in the above configuration, both the HS-PDSCH reception process and the HS-SCCH reception process are stopped, but only one of them may be stopped. The same applies to the following embodiments.

  Next, the operation flow of the mobile station according to the present embodiment will be described using FIG. When HSDPA is started, the mobile station repeats a series of processes (HS-SCCH monitoring loop) from steps (hereinafter abbreviated as ST) 10 to ST20 until HSDPA ends. In the HS-SCCH monitoring loop, the mobile station receives and monitors the HS-SCCH set indicated by the higher layer. That is, the mobile station decodes a plurality of HS-SCCHs included in the HS-SCCH set (ST31), and monitors whether these HS-SCCHs have an HS-SCCH addressed to itself (ST32). When there is no HS-SCCH addressed to the own station (ST32: NO), the process proceeds to ST20 and the HS-SCCH is continuously monitored. On the other hand, when there is an HS-SCCH addressed to the own station (ST32: YES), the HS-PDSCH is decoded according to the control information transmitted on the HS-SCCH addressed to the own station (ST33), and the packet of the decoding result is obtained. CRC is performed on the data (ST34). Then, the ACK signal or NACK signal created based on the CRC result is transmitted to the base station of the HSPDA serving cell (ST40). In the flowchart of FIG. 2, HS-SCCH and HS-PDSCH reception processing (ST30) is configured in ST31 to ST34.

  On the other hand, the mobile station performs the processing of ST50 to ST70 in parallel with the processing of ST30. In other words, the uplink compressed mode gap timing is detected by signaling from the higher layer (ST50). When the transmission timing of the ACK signal / NACK signal overlaps with the compressed mode gap section, that is, when the transmission mode of the ACK signal / NACK signal is included in the compressed mode gap section (ST60: YES). , ST30 series of reception processing is stopped (ST70). After the reception process is stopped, the process proceeds to ST20 and the HS-SCCH is continuously monitored. When the transmission timing of the ACK signal / NACK signal does not overlap the compressed mode gap section (in the case of ST60: NO), the process proceeds to ST20 without stopping the reception process, and the HS-SCCH is continuously monitored.

  Next, the relationship between transmission and reception timings of each channel transmitted and received by the mobile station according to the present embodiment will be described using FIG. Each of the HS-SCCH subframe and the HS-PDSCH subframe includes three slots. The relationship between the HS-PDSCH and the HS-SCCH corresponding to the HS-PDSCH (HS-SCCH that transmits control information necessary for receiving the HS-PDSCH) is the same as that of the first slot of the HS-PDSCH subframe and the HS-PDSCH. The last slot of the SCCH subframe overlaps. That is, reception of an HS-PDSCH subframe corresponding to the HS-SCCH is started at a timing one slot before the reception end timing of the HS-SCCH subframe. Then, an ACK signal or NACK signal for the HS-PDSCH subframe is transmitted using the HS-DPCCH subframe at a timing approximately 7.5 slots after the HS-PDSCH subframe reception end timing. Further, in parallel with the reception of the HS-SCCH and the HS-PDSCH, the mobile station detects the compressed mode gap section of the uplink (uplink DPCH in FIG. 3) by signaling from the higher layer. And the reception process of HS-PDSCH corresponding to the ACK signal / NACK signal with transmission timing in the gap section is stopped. That is, the reception process of the HS-PDSCH subframe having the reception end timing approximately 7.5 slots before the transmission start timing of the ACK signal / NACK signal having the transmission timing in the compressed mode gap section is stopped. Further, the HS-SCCH reception process corresponding to the HS-PDSCH for which the reception process has been stopped is also stopped. That is, the reception process of the HS-SCCH subframe having the last slot that overlaps the first slot of the HS-PDSCH subframe for which the reception process has been stopped is also stopped.

  As described above, according to the present embodiment, wasteful reception processing of HS-SCCH and HS-PDSCH is stopped, so that wasteful power consumption of the mobile station can be suppressed and power consumption can be reduced.

(Embodiment 2)
In HSDPA, a mobile station may repeatedly transmit an ACK signal / NACK signal for a number of times specified by signaling from an upper layer to the same subframe of HS-PDSCH a plurality of times. When the ACK signal / NACK signal is repeatedly transmitted, the mobile station does not decode the HS-PDSCH once the HS-PDSCH is assigned. This is specified in 3GPP. Therefore, in the mobile station according to the present embodiment, when the ACK signal / NACK signal is repeatedly transmitted to the same subframe of HS-PDSCH multiple times, reception processing of HS-PDSCH addressed to the own station is performed once Thereafter, HS-PDSCH and HS-SCCH reception processing corresponding to the HS-PDSCH corresponding to the number of repetitions after the second time are originally stopped to reduce power consumption. Hereinafter, the mobile station according to the present embodiment will be described.

  First, the configuration of the mobile station according to the present embodiment will be described using FIG. 1 again. Only parts different from the first embodiment will be described. In FIG. 1, the DPCH after despreading is input to the signaling detection unit 71, and the signaling detection unit 71 determines the number of repeated transmissions of the ACK signal / NACK signal (hereinafter, the number of repetitions) from the signaling included in the DPCH after despreading. And the control unit 72 is informed of the number of repetitions.

  The control unit 72 notifies the transmission unit 80 of the number of repetitions. The transmission unit 80 repeatedly transmits the ACK signal / NACK signal input from the error detection unit 404 by the number of repetitions notified from the control unit 72. That is, the ACK signal / NACK signal for the same subframe of HS-PDSCH is repeatedly transmitted.

  In addition, the control unit 72 controls the HS-PDSCH reception processing unit 40 to stop the reception processing for the subframe of the HS-PDSCH by an amount corresponding to the second and subsequent times out of the number of repetitions. For example, when the number of repetitions is 2 (N # acknack # transmit = 2), the control unit 72 receives the subframe corresponding to the first ACK signal / NACK signal to the HS-PDSCH reception processing unit 40. After performing the processing, the reception processing in the next one subframe section is stopped. In addition, when packet data is not received by the HS-PDSCH, HS-SCCH control information for the packet data is not necessary, and thus the control unit 72 is necessary for the reception processing of the packet data whose reception processing is stopped. The HS-SCCH reception processing unit 50 is controlled so as to stop the reception processing for the control information. That is, the control unit 72 also stops the reception processing of the HS-SCCH subframe that transmits the control information.

  Next, the operation flow of the mobile station according to the present embodiment will be described using FIG. However, the same steps as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. Based on the CRC result, the mobile station transmits an ACK signal or NACK signal to the base station of the HSPDA serving cell (ST41). At this time, the mobile station repeatedly transmits ACK signals or NACK signals for the number of times specified by signaling from the higher layer. For example, when the number of repetitions is designated as 2, the transmission of the ACK signal / NACK signal is repeated twice for the same subframe of HS-PDSCH.

  On the other hand, the mobile station performs the processing of ST51 to ST71 in parallel with the processing of ST30, and receives HS-PDSCH and HS-SCCH based on the number of repetitions (N # acknack # transmit) signaled from the higher layer. Stop processing. That is, the mobile station first detects the number of repetitions (N # acknack # transmit) by signaling from the higher layer (ST51). Then, the series of reception processing of ST30 is stopped only for the subframe period corresponding to the second and subsequent times (ST71). After the reception process is stopped, the process proceeds to ST20 and the HS-SCCH is continuously monitored.

  Next, the relationship between transmission and reception timings of each channel transmitted and received by the mobile station according to the present embodiment will be described using FIG. Each of the HS-SCCH subframe and the HS-PDSCH subframe includes three slots. Regarding the relationship between the HS-PDSCH and the HS-SCCH corresponding to the HS-PDSCH, the first slot of the HS-PDSCH subframe and the last slot of the HS-SCCH subframe overlap. That is, reception of an HS-PDSCH subframe corresponding to the HS-SCCH is started at a timing one slot before the reception end timing of the HS-SCCH subframe. Then, an ACK signal or NACK signal for the HS-PDSCH subframe is transmitted using the HS-DPCCH subframe at a timing approximately 7.5 slots after the HS-PDSCH subframe reception end timing. At this time, for example, when the number of repetitions is 2, the same ACK signal or NACK signal is repeatedly transmitted in the next subframe of the HS-DPCCH. Then, the mobile station has a subframe period corresponding to the second ACK signal / NACK signal, that is, the HS- in which the reception end timing ends approximately 7.5 slots before the transmission start timing of the second ACK signal / NACK signal. Stop the PDSCH subframe reception process. Similarly, when the number of repetitions is 3 times or more, reception processing of all subframes of HS-PDSCH in which reception end timing ends approximately 7.5 slots before the transmission start timing of the second and subsequent ACK signals / NACK signals, respectively. To stop. That is, the mobile station stops receiving processing of HS-PDSCH subframes corresponding to the second and subsequent repetitions. Further, the HS-SCCH reception process corresponding to the HS-PDSCH for which the reception process is stopped is also stopped. That is, the reception process of the HS-SCCH subframe having the last slot that overlaps the first slot of the HS-PDSCH subframe for which the reception process has been stopped is also stopped.

  As described above, according to the present embodiment, as in the first embodiment, the wasteful reception process of HS-SCCH and HS-PDSCH is stopped, so that wasteful power consumption of the mobile station is suppressed and power consumption is reduced. be able to.

(Embodiment 3)
In HSDPA, when the HSDPA serving cell is switched before the mobile station transmits the ACK signal / NACK signal after decoding the HS-PDSCH, the mobile station receives the ACK signal / NACK signal with the base station that transmitted the HS-PDSCH. Since the base station is different from the base station, the base station that has received the ACK signal / NACK signal cannot identify which packet data is the ACK signal / NACK signal. Therefore, such an ACK signal / NACK signal becomes a meaningless ACK signal / NACK signal for the received base station. In such a case, the packet data corresponding to the ACK signal / NACK signal is retransmitted from the base station of the switched HSDPA serving cell to the mobile station as in the first embodiment. From this point, there is no particular problem. Therefore, in the mobile station according to the present embodiment, the transmission of ACK / NACK signals that cannot be transmitted by the timing when the HSDPA serving cell is switched is stopped to reduce interference with other mobile stations. Furthermore, in the present embodiment, the reception processing of packet data that cannot transmit an ACK signal / NACK signal by the timing at which the HSDPA serving cell is switched is stopped in the first place to reduce power consumption. Hereinafter, the mobile station according to the present embodiment will be described.

  First, the configuration of the mobile station according to the present embodiment will be described using FIG. 1 again. Only parts different from the first embodiment will be described. In FIG. 1, the DPCH after despreading is input to the signaling detection unit 71, and the signaling detection unit 71 determines the switching timing of the HSDPA serving cell, that is, the ACK signal / NACK signal, from the signaling included in the DPCH after despreading. The switching timing at which the transmission destination is switched to another base station is detected, and the control unit 72 is notified of the switching timing.

  The control unit 72 causes the transmission unit 80 to stop transmission of an ACK signal / NACK signal whose transmission end timing is shifted after the switching timing detected by the signaling detection unit 71. When an ACK signal / NACK signal is being transmitted, the transmission is stopped halfway. In addition, the control unit 72 controls the HS-PDSCH reception processing unit 40 so as to stop the reception processing for packet data corresponding to the ACK signal / NACK signal for which transmission has been stopped. That is, the control unit 72 stops the reception process of the HS-PDSCH subframe that transmits the packet data corresponding to the ACK signal / NACK signal. Further, when packet data is not received, HS-SCCH control information for the packet data is not necessary, and therefore the control unit 72 performs control necessary for the packet data reception process for which reception processing is stopped. The HS-SCCH reception processing unit 50 is controlled to stop the reception processing for information. That is, the control unit 72 also stops the reception processing of the HS-SCCH subframe that transmits the control information.

  Next, the operation flow of the mobile station according to the present embodiment will be described using FIG. However, the same steps as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. The mobile station performs the processing of ST52 to ST72 in parallel with the processing of ST30. That is, the switching timing of the HSDPA serving cell is detected by signaling from the higher layer (ST52). If the transmission of the ACK signal / NACK signal cannot be completed by the switching timing, that is, the switching timing is the reception start timing of the HS-PDSCH subframe and the ACK signal / NACK signal corresponding to the subframe. If it is within the transmission end timing (in the case of ST62: NO), the series of reception processing of ST30 is stopped and the transmission processing of ST40 is stopped (ST72). Thereafter, the process proceeds to ST20 and the HS-SCCH is continuously monitored. If transmission of the ACK signal / NACK signal can be completed by the switching timing of the HSDPA serving cell (ST62: YES), the process proceeds to ST20 without stopping the reception process and the transmission process, and the HS-SCCH is monitored. Continue to do.

  Next, the relationship between transmission and reception timings of each channel transmitted and received by the mobile station according to the present embodiment will be described using FIG. Each of the HS-SCCH subframe and the HS-PDSCH subframe includes three slots. Regarding the relationship between the HS-PDSCH and the HS-SCCH corresponding to the HS-PDSCH, the first slot of the HS-PDSCH subframe and the last slot of the HS-SCCH subframe overlap. That is, reception of an HS-PDSCH subframe corresponding to the HS-SCCH is started at a timing one slot before the reception end timing of the HS-SCCH subframe. Then, an ACK signal or NACK signal for the HS-PDSCH subframe is transmitted using the HS-DPCCH subframe at a timing approximately 7.5 slots after the HS-PDSCH subframe reception end timing. In addition, the mobile station detects the switching timing of the HSDPA serving cell by signaling from the higher layer in parallel with the reception of the HS-SCCH and the HS-PDSCH. If the switching timing is between the reception start timing of the subframe of HS-PDSCH and the transmission end timing of the ACK signal / NACK signal corresponding to the subframe, transmission of the ACK signal / NACK signal is performed. In addition to stopping, reception processing of the subframe is stopped. That is, the reception processing of the HS-PDSCH subframe having the reception end timing approximately 7.5 slots before the transmission start timing of the ACK signal / NACK signal whose transmission is stopped is stopped. Further, the HS-SCCH reception process corresponding to the HS-PDSCH for which the reception process has been stopped is also stopped. That is, the reception process of the HS-SCCH subframe having the last slot that overlaps the first slot of the HS-PDSCH subframe for which the reception process has been stopped is also stopped.

  As described above, according to the present embodiment, as in the first embodiment, the wasteful reception process of HS-SCCH and HS-PDSCH is stopped, so that wasteful power consumption of the mobile station is suppressed and power consumption is reduced. be able to. In addition, since transmission of useless ACK signals / NACK signals is stopped, interference with other mobile stations can be reduced.

  The present invention is suitable for a mobile station apparatus used in a mobile communication system such as a W-CDMA system.

Block diagram showing a configuration of a mobile station according to Embodiment 1 of the present invention. Operation flow diagram of mobile station according to embodiment 1 of the present invention The figure which shows the transmission / reception timing of each channel in the mobile station which concerns on Embodiment 1 of this invention. Operation flow diagram of mobile station according to embodiment 2 of the present invention The figure which shows the transmission / reception timing of each channel in the mobile station which concerns on Embodiment 2 of this invention. Operation flow diagram of mobile station according to embodiment 3 of the present invention The figure which shows the transmission / reception timing of each channel in the mobile station which concerns on Embodiment 3 of this invention.

Explanation of symbols

10 antenna 20 duplexer 30 receiving unit 40 HS-PDSCH reception processing unit 50 HS-SCCH reception processing unit 60 CPICH despreading unit 61 SIR measurement unit 62 CQI selection unit 70 DPCH despreading unit 71 signaling detection unit 72 control unit 80 transmission unit 401 Despreading unit 402 Demodulating unit 403 Decoding unit 404 Error detecting unit 501 Despreading unit 502 Demodulating unit 503 Decoding unit 504 Determination unit

Claims (6)

First receiving means for performing a first receiving process including demodulation, decoding, and error detection of a downlink data channel;
Second receiving means for performing second receiving processing including demodulation and decoding of a downlink control channel for transmitting control information necessary for the first receiving processing;
Transmitting means for transmitting a response signal for error detection in the first receiving means to the base station apparatus via an uplink control channel;
Control means for stopping at least one of the first reception process, the second reception process, and the transmission process of the response signal in the transmission means based on the transmission timing of the response signal;
A mobile station apparatus comprising: Detecting means for detecting a section in which an uplink signal is not transmitted to the base station apparatus;
When the detected timing includes the transmission timing of the response signal, the control means is necessary for the first reception process and / or reception of the subframe of the downlink data channel corresponding to the response signal. Stopping the second reception process of the subframe of the downlink control channel for transmitting correct control information,
The mobile station apparatus according to claim 1. The control means, when the transmission means repeatedly transmits the response signal for the same subframe of the downlink data channel, the first reception processing of the subframe of the downlink data channel corresponding to the second and subsequent transmission times, and / Or stop the second reception process of the subframe of the downlink control channel that transmits the control information necessary for reception of the subframe,
The mobile station apparatus according to claim 1. Detecting means for detecting a switching timing at which the transmission destination of the response signal is switched from the base station device to another base station device;
If the detected switching timing is between the reception start timing of a subframe of a downlink data channel and the transmission end timing of a response signal corresponding to the subframe, the control means may receive the first reception of the subframe. Stop the second reception process of the subframe of the downlink control channel that transmits the control information necessary for processing and / or reception of the subframe;
The mobile station apparatus according to claim 1. Detecting means for detecting a switching timing at which the transmission destination of the response signal is switched from the base station device to another base station device;
If the detected switching timing is between the reception start timing of the subframe of the downlink data channel and the transmission end timing of the response signal corresponding to the subframe, the control means stops the transmission processing of the response signal Let
The mobile station apparatus according to claim 1. A first reception step for performing a first reception process including demodulation, decoding, and error detection of a downlink data channel;
A second reception step of performing a second reception process including demodulation and decoding of a downlink control channel for transmitting control information necessary for reception of the downlink data channel;
A transmission step of transmitting a response signal for error detection in the first reception step to the base station apparatus via an uplink control channel;
A control step of stopping at least one of the first reception processing, the second reception processing, and the transmission processing of the response signal in the transmission step based on the transmission timing of the response signal;
A receiving method in a mobile station apparatus, comprising:

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