Cdma mobile communication station, cdma mobile communication system and cdma packet transmission system

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a CDMA (Code Division Multiple Access) mobile communication system to which multi-code transmission, closed-loop transmission power control and DTX (Discontinuous Transmission) control are applied, a CDMA mobile communication station applied to the CDMA mobile communication system, and CDMA packet transmission. Regarding the method.

【0002】

[Conventional technology]

CDMA multiplexes a plurality of calls on the same frequency by assigning different spreading codes to each call and spreading packet data. As a method for realizing higher speed transmission by utilizing this feature, there is a multi-code transmission method in which a plurality of data channels using a plurality of spread codes are assigned to one call. This multi-code transmission method is disclosed in, for example, the "Specification of Air-Interface for the 3G Mobile System Ver.1.0", which is an air interface specification established by the Association of Radio Industries and Businesses (ARIB).

【0003】

The multi-code transmission scheme disclosed in this specification uses multiple spread codes (4 codes in this example: spread codes C1, C2, C3, C4) for a single call, as shown in Figure 21. Multiple data channels DPCH1, DPCH2, DPCH3 and DPCH4 (DPCH: Dedicated Physical CHannel) are used at the same time. In this case, packet data related to one call is allocated to each data channel DPCH1 to DPCH4 in parallel on a frame-by-frame basis. As a result, packet data of one call can be transmitted at a speed that is multiple times (four times in this example) that is transmitted via one data channel.

【0004】

Further, in the above-mentioned multi-code transmission method, for all channels DPCH1 to DPCH4, a pilot symbol for establishing synchronization, a so-called TPC (Transmitter Power Control) symbol for closed-loop transmission power, and an upper logical channel multiplexing are used. Add control information including the TFCI (Transport Format Combination Indicator) symbol for.

【0005】

In this case, the control information is spread by the same spread code (spread code C1 in this example) and shared for each data channel DPCH. That is, the same control information is transmitted to each channel DPCH1 to DPCH4 via a common control channel. Therefore, all the data channels DPCH1 to DPCH4 involved in multi-code transmission are transmitted at the same timing.

【0006】

By the way, so-called closed-loop transmission power control is known as a technique for controlling transmission power (transmission power). Closed-loop transmission power control is the following processing. The receiving power to interference ratio (SIR) is measured on the receiving side, the measured SIR is compared with the reference value, and the transmitting side is instructed to increase or decrease the transmission power. In this case, the increase width and the decrease width are set to predetermined constant values. On the other hand, the transmitting side increases or decreases the transmission power by the above-mentioned constant value according to the instruction of increasing or decreasing the transmission power.

【0007】

Further, DTX control is also known as a technique for controlling transmission power. DTX control is disclosed, for example, in the above specifications. The DTX control prohibits the transmission operation when there is no packet data to be transmitted, and starts the transmission operation when the packet data to be transmitted occurs.

【0008】

[Problems to be Solved by the Invention]

As described above, since multi-code transmission allocates a plurality of data channels to one call, there is a concern that the transmission power will increase. Therefore, it is conceivable to apply the closed-loop transmission power control and the DTX control to the multi-code transmission to control the transmission power.

【0009】

However, in the multi-code transmission in which the control information is shared as described above, the transmission related to the plurality of data channels assigned to one call is started and stopped at the same timing. Therefore, when DTX control is applied to this multi-code transmission, the transmission power increases or decreases sharply. Therefore, the closed-loop transmission power control cannot follow. Therefore, there are problems such as deterioration of transmission quality between the mobile station and the base station related to other users, and wasteful power consumption in the mobile station and base station related to other users.

【0010】

More specifically, when the transmission power increases sharply, the power of interference with other users also sharply increases. On the other hand, in the closed loop transmission power control, as described above, the transmission power can be increased only by a predetermined constant value. Therefore, if the interference power to another user increases rapidly beyond the above-mentioned constant value, it takes time for the mobile station and the base station related to the other user to sufficiently increase the transmission power. Therefore, the mobile station and the base station related to other users must perform transmission in a state where the interference power is large, so that the transmission quality deteriorates.

【0011】

Further, when the transmission power decreases sharply, the interference power to other users also sharply decreases. In this case, if the interference power to other users is rapidly reduced beyond the above-mentioned constant value, it will take time for the mobile station and the base station related to the other user to reduce the transmission power to the minimum necessary. .. In this case, the mobile station and the base station related to other users will continue the transmission with a transmission power larger than the transmission power for maintaining the minimum necessary transmission quality, so that wasteful power will be consumed. ..

【0012】

Therefore, an object of the present invention is to solve the above-mentioned technical problem, and to provide packet data when packet data related to one call is wirelessly transmitted via a plurality of data channels by sharing predetermined control information. It is an object of the present invention to provide a CDMA mobile communication station, a CDMA mobile communication system, and a CDMA packet transmission method capable of suppressing a sudden change in transmission power even when transmission operation is permitted only in a case.

【0013】

[Means for solving problems]

The present invention for achieving the above object is from a multi-code transmission means for wirelessly transmitting packet data related to one call in CDMA mobile communication via a plurality of data channels by sharing predetermined control information, and this multi. A transmission power control means that controls the transmission power when transmitting the packet data based on an instruction for increasing or decreasing the transmission power from the communication partner station that has received the packet data transmitted by the code transmission means, and the packet. Until the data is generated, the transmission by the multi-code transmission means is not started, and when the packet data is generated, the multi-code transmission means is controlled and the packet data is transmitted in the data channel unit for a predetermined time. It includes a transmission start control means for starting the data in a staggered manner.

【0014】

Further, the present invention is transmitted by a multi-code transmission means for wirelessly transmitting packet data related to one call in CDMA mobile communication via a plurality of data channels by sharing predetermined control information, and the multi-code transmission means. It is transmitted by the transmission power control means that controls the transmission power when transmitting the packet data and the multi-code transmission means based on the instruction of the increase or decrease of the transmission power from the communication partner station that has received the packet data. The transmission by the multi-code transmission means is not stopped until the packet data is exhausted, and when the packet data is exhausted, the multi-code transmission means is controlled to perform data transmission via the data channel. It includes a transmission stop control means for stopping the data at a predetermined time for each channel.

【0015】

BEST MODE FOR CARRYING OUT THE INVENTION

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

【0016】

Embodiment 1 FIG. 1 is a conceptual diagram showing the overall configuration of the CDMA mobile communication system according to the first embodiment of the present invention. This CDMA mobile communication system includes a mobile station 1 and a base station 2. The mobile station 1 is composed of a mobile phone or the like. Base station 2 forms a unique cell 3. This CDMA mobile communication system realizes mobile communication by wirelessly multi-coding packet data between a base station 2 and a mobile station 1 existing in cell 3 of the base station 2.

【0017】

More specifically, the mobile station 1 and the base station 2 wirelessly communicate using the data channel DCH (DPDCH: Dedicated Physical Data CHannel) and the control channel CCH (DPCCH: Dedicated Physical Control CHannel). More specifically, the base station 2 transmits downlink packet data and control information to the mobile station 1 via the downlink data channel IDCH and the downlink control channel ICCH, respectively. Further, the mobile station 1 transmits the uplink packet data and the control information to the base station 2 via the uplink data channel ODCH and the uplink control channel OCCH, respectively.

【0018】

When transmitting packet data, the mobile station 1 and the base station 2 control the transmission power by using the so-called closed-loop transmission power control. More specifically, the mobile station 1 is based on the power of the packet data destined for its own station transmitted from the base station 2 and the power (interference power) of the packet data destined for the mobile station 1 related to another user. Measure SIR. After that, the mobile station 1 compares the measured SIR with the reference value, and instructs the base station 2 to increase or decrease the transmission power of the packet data addressed to the mobile station 1. In this case, the increase width and the decrease width are predetermined constant values, respectively. On the other hand, the base station 2 increases or decreases the transmission power of the packet data addressed to the mobile station 1 by the above-mentioned constant value according to the instruction from the mobile station 1.

【0019】

Further, the base station 2 measures the SIR based on the power of the packet data transmitted from the mobile station 1 and the power (interference power) of the packet data transmitted from the mobile station 1 related to another user. .. After that, the base station 2 compares the measured SIR with the reference value, and instructs the mobile station 1 to increase or decrease the transmission power of the packet data addressed to the base station 2. In this case, the increase width and the decrease width are predetermined constant values, respectively. On the other hand, the mobile station 1 increases or decreases the transmission power of the packet data by the above-mentioned constant value according to the instruction from the base station 2.

【0020】

Further, the mobile station 1 and the base station 2 control the transmission power by using the so-called DTX control in addition to the closed-loop transmission power control. More specifically, the mobile station 1 and the base station 2 prohibit the transmission operation until the packet data to be transmitted is generated, and start the transmission operation when the packet data is generated. Further, the mobile station 1 and the base station 2 continue the transmission operation until the packet data to be transmitted is exhausted, and stop the transmission operation when the packet data is exhausted.

【0021】

As described above, by controlling the transmission power of the mobile station 1 and the base station 2, the transmission quality above a certain level is ensured.

【0022】

FIG. 2 is a diagram for explaining multi-code transmission of downlink packet data. Base station 2 realizes high-speed multi-code transmission by assigning four downlink data channel IDCHs to one call. That is, the base station 2 executes parallel transmission by dividing the packet data into frame units and appropriately allocating each data frame to the four downlink data channel IDCHs.

【0023】

More specifically, base station 2 uses four spread codes C1, C2, C3, and C4 for packet data related to one call, as shown in FIGS. 2 (b) to 2 (e). One data channel, namely downlink 1st data channel IDCH1, downlink 2nd data channel IDCH2, downlink 3rd data channel IDCH3, and downlink 4th data channel IDCH4, is assigned.

【0024】

The structure of the data frame created in the base station 2 is as shown in FIG. 2 (f). That is, the data frame consists of 16 slots. One slot has a data symbol and a control symbol including a pilot symbol for establishing synchronization, a TPC symbol used for closed-loop transmission power control, and a TFCI symbol used for higher logical channel multiplexing.

【0025】

The base station 2 monitors whether or not downlink packet data has occurred in a state where there is no downlink packet data to be transmitted and transmission of downlink packet data is suspended. When downlink packet data is generated, the base station 2 sets the data transmission timing immediately after the data generation as a reference timing, and starts transmission via the downlink first data channel IDCH1 in response to this reference timing. In this way, the base station 2 performs so-called DTX control.

【0026】

Specifically, as shown in FIG. 2B, the base station 2 transmits a predetermined number of dummy frames via the downlink first data channel IDCH 1, and then downlinks a predetermined frame of packet data. 1 Transmit via data channel IDCH1. In this case, the control symbol included in the packet data frame is transmitted via the downlink control channel ICCH different from the downlink first data channel IDCH1. This downlink control channel ICCH is a channel that uses the spread code C1 in the first embodiment. As for the uplink control channel OCCH, as shown in Fig. 2 (a), transmission is started by establishing downlink synchronization.

【0027】

Further, as shown in FIG. 2C, the base station 2 transmits the same number of dummy frames as described above via the second data channel IDCH 2 in response to the timing delayed by a predetermined frame from the reference timing. .. After that, the base station 2 transmits a predetermined frame of packet data via the second data channel IDCH2. In this case, the base station 2 updates the transmission start timing of the downlink second data channel IDCH2 as a reference timing.

【0028】

Further, as shown in FIG. 2D, the base station 2 descends the dummy frame and the predetermined frame of the packet data in response to the timing delayed by the predetermined frame from the new reference timing, and sets the third data channel IDCH3. Transmit via. Furthermore, as shown in FIG. 2E, the base station 2 responds to the timing delayed by the predetermined frame from the reference timing, which is the transmission start timing of the downlink third data channel IDCH3, to display the dummy frame and the packet data. A predetermined frame is transmitted via the fourth data channel IDCH4.

【0029】

FIG. 3 is a diagram for explaining multi-code transmission of uplink packet data. Mobile station 1 suspends data transmission until uplink packet data is generated. In this situation, when uplink packet data is generated, the mobile station 1 uplinks a predetermined number of dummy frames and sets the first data channel ODCH1 in response to the reference timing which is the data transmission timing immediately after the data is generated. After transmission via, packet data is subsequently transmitted via the first data channel ODCH1. Further, the mobile station 1 starts transmission via the uplink second data channel ODCH2 in response to a timing delayed by a predetermined frame from the reference timing, and each time the uplink third data channel ODCH3 and the uplink third data channel ODCH3 are further delayed. Transmission via the 4th upstream data channel ODCH4 is started. As for the downlink control channel ICCH, as shown in FIG. 3A, transmission is started by establishing uplink synchronization.

【0030】

As described above, according to the first embodiment, when the data transmission is suspended until the packet data is generated and the transmission is started in response to the generation of the packet data, the data is assigned to one call. Instead of starting transmission for all data channel DCHs at the same time, transmission is started for each data channel DCH in order with a delay of a predetermined frame. Therefore, it is possible to suppress a rapid increase in transmission power.

【0031】

Therefore, it is possible to suppress a rapid increase in interference power with respect to other users. To give a numerical example, it is possible to realize power suppression of about -15 dBμ to + 50 dBμ. Therefore, the mobile station 1 and the base station 2 can perform closed-loop transmission power control satisfactorily. More specifically, when the mobile station 1 starts data transmission, the mobile station 1 related to another user increases the transmission power instructed by the base station 2 of the mobile station 1 that started the data transmission. It can follow the increase in power. Further, when the data transmission to the mobile station 1 is started by the base station 2, the base station 2 starts the above-mentioned data transmission to increase the transmission power instructed by the mobile station 1 related to another user. It can follow the increase in power. Therefore, it is possible to prevent a deterioration in transmission quality between the mobile station 1 and the base station 2 related to another user. Therefore, a highly reliable CDMA mobile communication system can be constructed.

【0032】

Embodiment 2 FIG. 4 is a diagram for explaining multi-code transmission of packet data according to the second embodiment of the present invention. The second embodiment is for more specifically explaining the first embodiment.

【0033】

As shown in FIG. 4A, for example, a transmitting station composed of mobile station 1 or base station 2 outputs packet data A, B, C, ... Related to one call to a plurality of frames (A-1). , A-2, A-3, A-4), (B-1, B-2, B-3) and (C-1, C-2, C-3, C-4, C-5, C -6, divide into C-7). In addition, as shown in FIGS. 4 (b), (c), (d) and (e), the transmitting station spreads four packets data A, B, C, ... Related to one call. Allocate the first data channel DCH1, the second data channel DCH2, the third data channel DCH3, and the fourth data channel DCH4 using the codes C1, C2, C3, C4. The number of spread codes, that is, the number of data channels is preset as the number of multi-codes Ccode. In the example of FIG. 4, the multicode number Ccode is set to 4.

【0034】

The transmitting station transmits the plurality of generated frames using any of the first to fourth data channels DCH1 to DCH4. In this case, the transmitting station makes the transmission start timing different for each data channel DCH. At this time, the number of channels having the same transmission start timing, that is, the number of spreading codes, is preset as the number of simultaneous processing codes Cnum. In the example of FIG. 4, the number of simultaneous processing codes Cnum is set to 1. Further, the delay width of the transmission start timing is preset for each frame. More specifically, the delay width of the transmission start timing is preset as the number of delay frames Cfrm. The delay frame number Cfrm is determined based on the time required to follow the transmission power control using the TPC symbol with respect to the increase in the interference power caused by increasing the number of multicodes Ccode by one, for example. In the example of FIG. 4, the delay frame number Cfrm is set to 1.

【0035】

More specifically, when packet data is generated, the transmitting station transmits one dummy frame dmy via the first data channel DCH1 in response to a reference timing corresponding to the data transmission timing immediately after the data is generated. To start. The dummy frame dmy may be two or more frames. Next, the transmitting station transmits the data frame related to the packet data via the first data channel DCH1 in response to the end of transmission of the dummy frame dmy. Further, the transmitting station starts transmission of one dummy frame dmy via the second data channel DCH2 in response to one frame elapse from the start of transmission of the dummy frame dmy via the first data channel DCH1. Then, the transmitting station transmits the data frame via the second data channel DCH2 following the dummy frame.

【0036】

Further, the transmitting station starts transmission of one dummy frame dmy via the third data channel DCH3 in response to one frame elapse from the start of transmission of the dummy frame dmy via the second data channel DCH2. The transmission of the data frame is started following the dummy frame dmy. Furthermore, the transmitting station starts transmission of one dummy frame dmy via the fourth data channel DCH4 in response to one frame elapse from the start of transmission of the dummy frame dmy via the third data channel DCH3. , The transmission of the data frame is started following the dummy frame dmy.

【0037】

FIG. 5 is a diagram for explaining multi-code transmission of packet data when the number of delay frames Cfrm is set to 2. That is, the transmitting station starts the transmission related to the first data channel DCH1 and then starts the transmission related to the second data channel DCH2 at intervals of two frames. After that, for the 3rd data channel DCH3 and the 4th data channel DCH4, similarly, the timing when 2 frames have passed from the start of transmission of the dummy frame dmy via the 2nd data channel DCH2 and the dummy via the 3rd data channel DCH3. Transmission is started in response to the timing when two frames have passed from the start of transmission of frame dmy.

【0038】

FIG. 6 is a diagram for explaining multi-code transmission of packet data when the number of delay frames Cfrm is set to 3 and the number of simultaneous processing codes Cnum is set to 2. That is, the transmitting station starts transmission related to the two data channels DCH at the same time. More specifically, the transmitting station starts the transmission related to the first and second data channels DCH1 and DCH2 at the same time, and then transmits the transmission related to the third and fourth data channels DCH3 and DCH4 at intervals of 3 frames. Start at the same time.

【0039】

As described above, according to the second embodiment, when transmitting packet data, transmission can be started in various patterns by appropriately setting the number of delay frames Cfrm and the number of simultaneous processing codes Cnum. Therefore, the transmission power increase pattern can be arbitrarily set. Therefore, it is possible to realize desired transmission power control suitable for the surrounding radio wave environment.

【0040】

Embodiment 3 FIG. 7 is a block diagram showing an internal configuration of the mobile station 1 and the base station 2 according to the third embodiment of the present invention. The third embodiment is for more specifically explaining the first and second embodiments.

【0041】

The mobile station 1 and the base station 2 include a transmitting unit 10, a receiving unit 20, and an antenna unit 30. The transmission unit 10 includes one wireless frame generation unit 11, one control unit 12, four modulation units 13, four diffusion units 14 provided in a one-to-one correspondence with each modulation unit 13, and one synthesis unit. It includes 15 and one transmission amplification unit 16. The modulation unit 13 and the diffusion unit 14 are associated with the data channel DCH assigned to one call, respectively. In the third embodiment, since four data channel DCHs are assigned to one call, the modulation unit 13 and the diffusion unit 14 are associated with the four data channel DCHs, respectively.

【0042】

The receiving unit 20 includes one receiving amplification unit 21, four despreading units 22, four demodulation units 23, and one packet data extraction unit 24. The despreading unit 22 and the demodulating unit 23 are associated with the data channel DCH assigned to one call, respectively, as in the case of the transmitting unit 10. The antenna unit 30 includes a transmitting antenna 31 and a receiving antenna 32.

【0043】

Various information for closed-loop transmission power control is given to the transmitting unit 10 from the receiving unit 20. Specifically, the transmitting unit 10 is given the TPC symbol demodulated by the receiving unit 20 and the SIR measured by the receiving unit 20. The transmission unit 10 realizes the increase / decrease of the transmission power according to the instruction of the partner station based on the TPC symbol, and sets the TPC symbol for instructing the increase / decrease of the transmission power of the partner station based on the SIR. As a result, closed-loop transmission power control is realized.

【0044】

Next, the internal configurations of the transmitting unit 10 and the receiving unit 20 will be described in more detail. The radio frame generation unit 11 provided in the transmission unit 10 includes a transmission buffer 11a. The transmission buffer 11a temporarily holds packet data and control information to be transmitted. When the wireless frame generation unit 11 receives the packet data and the control information, the wireless frame generation unit 11 stores the received packet data and the control information in the transmission buffer 11a.

【0045】

The control unit 12 includes, for example, a CPU (Central Processing Unit). The control unit 12 constantly monitors the transmission buffer 11a in the wireless frame generation unit 11 in order to detect the presence or absence of packet data generation. That is, when the control unit 12 detects that the packet data has begun to be accumulated in the transmission buffer 11a, it detects that the downlink packet data has occurred. Further, when the control unit 12 detects that the packet data has disappeared from the transmission buffer 11a, it detects that the packet data has disappeared.

【0046】

When the control unit 12 detects the generation of packet data, the control unit 12 controls the operations of the radio frame generation unit 11, the modulation unit 13, the diffusion unit 14, and the transmission amplification unit 16, and executes the transmission start control process. More specifically, the control unit 12 instructs the radio frame generation unit 11 to start transmission of the radio frame. In this case, the control unit 12 instructs the four data channel DCHs assigned to one call to have different transmission start timings for each one or a plurality of data channels.

【0047】

Further, the control unit 12 determines a value to be set for the TPC symbol in the data frame to be transmitted based on the SIR given by the reception unit 20. Specifically, the control unit 12 compares the SIR with the reference value and determines an increase or decrease in the transmission power at the partner station. The control unit 12 notifies the wireless frame generation unit 11 of the bit information corresponding to the increase / decrease in order to indicate the increase / decrease of the transmission power in the determined partner station to the partner station, and the TPC of the control information to be transmitted in the next slot. Set as a symbol.

【0048】

Further, the control unit 12 instructs the start of operation of the modulation unit 13, the diffusion unit 14, and the transmission amplification unit 16. In this case, the control unit 12 controls the transmission amplification unit 16 according to the TPC symbol given by the reception unit 20 and adjusts the transmission power. Specifically, the control unit 12 separately executes transmission power control with respect to the packet data in the wireless frame and the control information.

【0049】

More specifically, the control unit 12 increases the transmission power of the transmission amplification unit 16 by a predetermined constant width when the TPC symbol indicates an increase in the transmission power of the packet data. To increase. Further, when the TPC symbol indicates a decrease in the transmission power of the packet data, the control unit 12 reduces the amplification degree of the transmission amplification unit 16 so that the transmission power is reduced by a predetermined constant width. Further, the control unit 12 sets Ccode × based on the number Ccode of the data channel DCH assigned to one call, the transmission power Pt per data channel, and a predetermined coefficient η (η> 0) with respect to the control information. The amplification degree of the transmission amplification unit 16 is controlled so that the transmission power is Pt × η.

【0050】

Upon receiving the transmission start instruction, the radio frame generation unit 11 generates a radio frame of a predetermined format based on the packet data and control information stored in the transmission buffer 11a. For example, the radio frame generation unit 11 in the base station 2 generates a plurality of radio frames in which a pilot symbol, a data symbol, a TPC symbol, a data symbol, and a TFCI symbol are arranged in this order, as shown in FIG. 2 (f). The TPC symbol in this case corresponds to the bit information notified from the control unit 12 according to the increase / decrease in the transmission power of the partner station.

【0051】

The radio frame generation unit 11 selectively gives the generated plurality of radio frames to the specific modulation unit 13. In this case, the wireless frame generation unit 11 starts transmitting wireless frames individually for each of the four data channel DCHs in response to the transmission start timing instructed by the control unit 12. However, the control information in the radio frame is given to the modulation unit 13 corresponding to the spreading code C1 in order to be shared by the four data channels DCH.

【0052】

Each modulation unit 13 performs a predetermined primary modulation process such as QPSK (Quadrature Phase Shift-Keying) on the given radio frame to generate a modulation frame. Each modulation unit 13 gives the generated modulation frame to the corresponding diffusion unit 14.

【0053】

Each spreading unit 14 performs a spreading process on the given modulation frame to generate a spreading frame. More specifically, diffusion codes C1, C2, C3 and C4 are preset in each diffusion unit 14. Each spreading unit 14 generates a spreading frame by calculating a given modulation frame and a preset spreading code. Each diffusion unit 14 gives this diffusion frame to the synthesis unit 14.

【0054】

The synthesizing unit 15 synthesizes four diffusion frames given by each diffusion unit 14 in order to transmit them as one diffusion signal. The synthesis unit 15 gives the created diffusion signal to the transmission amplification unit 16. The transmission amplification unit 16 amplifies the diffusion signal at an amplification degree according to the instruction of the control unit 12, and then transmits the diffusion signal to the partner station via the transmission antenna 31.

【0055】

The diffused signal transmitted from the partner station is received by the receiving antenna 32 and then given to the receiving amplification unit 21. The reception amplification unit 21 amplifies the diffusion signal, and then gives the amplified diffusion signal to each reverse diffusion unit 22. Different diffusion codes C1 to C4 used in the transmission unit 10 are set in the reverse diffusion unit 22. The back-diffusion unit 22 executes a back-diffusion process, which is the reverse process of the diffusion process in the diffusion unit 14. Specifically, the despreading unit 22 despreads the spreading signal and restores the demodulated signal by multiplying the spreading signal and the set spreading codes C1 to C4, respectively. The restored demodulation signal is given to the demodulation unit 23.

【0056】

The demodulation unit 23 restores the baseband signal from the demodulation signal by executing a demodulation process which is the reverse process of the modulation process in the modulation unit 13. This restored baseband signal is given to the packet data extraction unit 24. The packet data extraction unit 24 separates and extracts packet data from the baseband signal.

【0057】

Further, the demodulation unit 23 corresponding to the diffusion code C1 extracts control information from the baseband signal, and further extracts the TPC symbol from this. The demodulation unit 23 gives the extracted TPC symbol to the control unit 11 provided in the transmission unit 10 as information for controlling the transmission power of its own station. Further, the demodulation unit 23 corresponding to the diffusion code C1 obtains the received power based on the pilot symbol from the extracted control information, and measures the SIR based on the obtained received power. The demodulation unit 23 gives the measured SIR to the control unit 11 provided in the transmission unit 10 as information for controlling the transmission power of the partner station.

【0058】

FIG. 8 is a flowchart for explaining the transmission start control process in the control unit 12 in more detail. The control unit 12 realizes this transmission start control process by software. Note that this transmission start control process may be executed by hardware that realizes each process, for example.

【0059】

The control unit 12 checks for the presence or absence of packet data at each start timing of the wireless frame held in advance (step S1). Specifically, the control unit 12 determines whether or not packet data has begun to be accumulated in the transmission buffer 11a in the wireless frame generation unit 11. When there is no packet data (NO in step S1), the control unit 12 ends the transmission start control process and resumes the process in step S1 in response to the start timing of the next wireless frame.

【0060】

When there is packet data (YES in step S1), the control unit 12 first acquires the number of currently used codes m and the number of delayed frames count value f, and clears the number of simultaneous processing codes count value k (step S2). ). After that, the control unit 12 compares the number of multi-codes Ccode assigned to one call with the number of currently used codes m (step S3). If the number of multi-codes Ccode is less than the number of currently used codes m (NO in step S3), all the data channel DCHs to be assigned have already been used, and the control unit 12 ends the transmission start control process. On the other hand, if the number of multi-codes Ccode is larger than the number of currently used codes (YES in step S3), the control unit 12 increments the delay frame number count value f by one (step S4).

【0061】

Next, the control unit 12 determines whether or not the delay frame count value f is equal to or greater than the predetermined delay frame number Cfrm (step S5). If the delay frame count value f is less than the delay frame count Cfrm (NO in step S5), the preset delay timing has not yet elapsed, so the control unit 12 ends the process. On the other hand, if the delay frame count value f is the delay frame count Cfrm or more (YES in step S5), the delay timing has elapsed, so the control unit 12 first delays in preparation for the next processing. Clear the frame count value f (step S6).

【0062】

Next, the control unit 12 determines whether or not the simultaneous processing code number count value k is smaller than the simultaneous processing code number Cnum (step S7). If the simultaneous processing code count value k is less than the simultaneous processing code number Cnum (YES in step S7), the control unit 12 increments the currently used code number m and the simultaneous processing code number count value k by one (step S8). ). After that, the control unit 12 starts transmission related to the mth data channel DCHm corresponding to the number of currently used codes m (step S9).

【0063】

Next, the control unit 12 determines whether or not the number of currently used codes m is smaller than the number of multi-codes Ccode (step S10). If the number of currently used codes m is larger than the number of multi-codes Ccode (NO in step S10), it means that all the data channel DCHs are already used, and the control unit 12 ends the transmission start control process. .. On the other hand, if the number of currently used codes m is smaller than the number of multi-codes Ccode (YES in step S10), the surplus data channel DCH remains, and the one to be processed at the same time as the mth data channel DCHm remains. It may be. Therefore, the control unit 12 re-executes the process of step S7 as to whether or not the simultaneous processing code number count value k is smaller than the simultaneous processing code number Cnum.

【0064】

If the data channel DCH to be processed at the same time remains, that is, if the number of simultaneous processing codes Cnum is 2 or more, the control unit 12 sets the number of currently used codes m and the number of simultaneous processing codes k to 1 in step S8. After incrementing by one, transmission related to the incremented mth data channel DCHm is started in step S9. On the other hand, if there is no data channel DCH to be processed at the same time, that is, if the number of simultaneous processing codes Cnum is 1, the control unit 12 ends the transmission start control process.

【0065】

By executing the transmission start control process as described above, transmission is performed via the four data channels DCH1 to DCH4 for one call.

【0066】

Embodiment 4 FIG. 9 is a diagram for explaining multi-code transmission of packet data according to the fourth embodiment of the present invention. In the description of the fourth embodiment, FIG. 7 will be referred to as necessary.

【0067】

In the above-described first to third embodiments, all the data channel DCHs assigned to one call are used regardless of the amount of packet data to be transmitted. On the other hand, in the fourth embodiment, the data channel DCH used is limited when the amount of packet data to be transmitted is small.

【0068】

More specifically, the control unit 12 determines the number of data channels to be used based on the amount of data in the buffer Dbuf. The amount of data in the buffer Dbuf is the amount of data of packet data stored in the transmission buffer 11a in the wireless frame generation unit 11. More specifically, the control unit 12 determines the comparison result between the amount of data in the buffer Dbuf and the (m + 1) th (m + 1) transmission start threshold value Tth- (m + 1) and the code (m + 1) transmission start time Tstr. -Determine the data channel DCH to start transmission based on (m + 1).

【0069】

The th (m + 1) transmission start threshold value Tth- (m + 1) and the code (m + 1) transmission start time Tstr- (m + 1) are set to appropriate values according to the transmission environment. More specifically, when the amount of packet data generated is large on average and when the retention in the transmission buffer 11a is avoided, the (m + 1) th transmission start threshold value Tth- (m + 1) is relative. The code (m + 1) transmission start time Tstr- (m + 1) is set to a relatively short value. In addition, when the amount of packet data generated is small on average and the amount of interference itself is small, the (m + 1) th transmission start threshold value Tth- (m + 1) is set to a relatively high value. , Code (m + 1) transmission start time Tstr- (m + 1) is set to a relatively long value.

【0070】

More specifically, the control unit 12 starts transmission via the first data channel DCH1 in response to the detection that the packet data is present. After that, the control unit 12 responds to the timing when the amount of data in the buffer Dbuf is equal to or higher than the code 2 transmission start threshold value Tth-2 over the predetermined code 2 transmission start time Tstr-2, and the control unit 12 of the second data channel DCH2. Start transmission.

【0071】

Further, the control unit 12 has a code 3 transmission start threshold Tth-3 or more in which the amount of data in the buffer Dbuf is larger than the code 2 transmission start threshold Tth-2 over a predetermined code 3 transmission start time Tstr-3. In response to the timing, transmission of the third data channel DCH3 is started. Furthermore, the control unit 12 sets the amount of data in the buffer Dbuf to be greater than or equal to the code 4 transmission start threshold Tth-4, which is larger than the code 3 transmission start threshold Tth-3 over the predetermined code 4 transmission start time Tstr-4. In response to the timing, transmission of the 4th data channel DCH4 is started.

【0072】

In this way, since the transmission start timing is determined based on the amount of data in the buffer Dbuf, the delay width from the transmission start of the other data channels is relatively random. More specifically, as shown in FIG. 10, the delay width between the first data channel DCH1 and the second data channel DCH2 is one frame, and the delay width between the second data channel DCH2 and the third data channel DCH3 is one frame. The delay width is 3 frames, and the delay width between the 3rd data channel DCH3 and the 4th data channel DCH4 is 2 frames.

【0073】

As described above, according to the fourth embodiment, every time the amount of data in the buffer Dbuf is equal to or greater than the predetermined transmission start threshold value Tth over the predetermined transmission start time Tstr, the transmission related to each data channel DCH is started. Therefore, the transmission start timing of each data channel DCH deviates. Therefore, as in the first embodiment, the closed-loop transmission power control can be performed satisfactorily, so that it is possible to prevent a deterioration in transmission quality between the mobile station 1 and the base station 2 related to another user.

【0074】

Moreover, when the amount of data in the buffer Dbuf is small, all data channel DCHs are not used. For example, if the amount of data in the buffer Dbuf does not exceed the code 4 transmission start threshold Tth-4, only 3 of the 4 data channels DCH1 to DCH4 assigned to one call are DCH1 to DCH3. Will be used. Therefore, it is possible to suppress a rapid increase in transmission power as compared with the case where all data channels DCH are used. Therefore, it is possible to suppress a rapid increase in interference power with respect to other users as compared with the case where all data channels DCH are used.

【0075】

Embodiment 5 FIG. 11 is a flowchart for explaining the transmission start control process according to the fifth embodiment of the present invention. The fifth embodiment is a more specific description of the fourth embodiment.

【0076】

The control unit 12 first acquires the number of currently used codes m in response to the start timing of the possessed wireless frame (step T1). Next, the control unit 12 determines whether or not the acquired number of currently used codes m is smaller than the preset number of multi-codes Ccode (step T2). If the number of currently used codes m is larger than the number of multi-codes Ccode (NO in step T2), the control unit 12 is already using all the data channel DCHs assigned to one call. , The transmission start control process is terminated.

【0077】

On the other hand, if the number of currently used codes m is less than or equal to the number of multi-codes Ccode (YES in step T2), the control unit 12 has the data amount Dbuf in the buffer equal to or more than the code m transmission start threshold Tth- (m + 1). Determine if it exists (step T3). If the amount of data in the buffer Dbuf is less than the code m transmission start threshold Tth- (m + 1) (NO in step T3), the packet data is in the transmission buffer 11a so that another data channel DCH must be used. Since it is not accumulated, the control unit 12 ends the transmission start control process after executing the stop process (step T4) of the code m transmission start determination timer Tstr- (m + 1).

【0078】

On the other hand, if the amount of data in the buffer Dbuf is equal to or greater than the code m transmission start threshold value Tth- (m + 1) (YES in step T3), the control unit 12 controls the code m transmission start determination timer Tstr- (m + 1). ) Has already been started (step T5). If the code m transmission start determination timer Tstr- (m + 1) has not been activated (NO in step T5), the control unit 12 activates the code m transmission start determination timer Tstr- (m + 1) (step T6). ), After that, the transmission start control process is terminated. On the other hand, if the code m transmission start determination timer Tstr- (m + 1) is activated (YES in step T5), does the control unit 12 time out the code m transmission start determination timer Tstr- (m + 1)? Determine if not (step T7).

【0079】

If the code m transmission start determination timer Tstr- (m + 1) has not timed out (NO in step T7), the amount of data in the buffer Dbuf temporarily sets the code m transmission start threshold value Tth- (m + 1). Since it may have just exceeded, the control unit 12 ends this transmission start control process. After that, after the start timing of the next wireless frame elapses, the amount of data in the buffer Dbuf is equal to or higher than the code m transmission start threshold value Tth- (m + 1), and the code m transmission start determination timer Tstr- (m + 1) times out. If so (YES in step T7), the control unit 12 starts communication via the mth data channel after incrementing the number of currently used codes m by one (step T8). After that, the control unit 12 returns to step T2, determines whether or not all the data channels DCH have been used, and if not all have been used yet, repeatedly executes the process from step T3.

【0080】

Embodiment 6 FIG. 12 is a diagram illustrating multi-code transmission of downlink packet data according to the sixth embodiment of the present invention.

【0081】

In the above-described first to fifth embodiments, the packet data transmission start control is described. On the other hand, in the sixth embodiment, the transmission stop control of packet data is taken as an example.

【0082】

The base station 2 monitors whether or not the downlink packet data to be transmitted exists and the downlink packet data is lost from the transmission buffer 11a in the state where the downlink packet data is being transmitted. When the downlink packet data is lost, the base station 2 starts to stop the transmission via the data channel IDCH in response to this timing.

【0083】

Specifically, when the control unit 12 detects that the downlink packet data has disappeared from the transmission buffer 11a, the control unit 12 stops transmission via the downlink fourth data channel IDCH 4 in response to this detection. After that, the control unit 12 stops the transmission related to the downlink third data channel IDCH 3 after a predetermined frame delay. Further, the control unit 12 stops the transmission related to the downlink second data channel IDCH2 after the predetermined frame delay, and after the predetermined frame delay from the transmission stop of the downlink second data channel IDCH2, transmits the downlink first data channel IDCH1. Stop. As for the uplink control channel OCCH, as shown in FIG. 12 (e), the transmission is stopped due to the downlink synchronization loss.

【0084】

FIG. 13 is a diagram for explaining multi-code transmission of uplink packet data. Similarly, in the case of uplink packet data, the mobile station 1 stops the transmission related to the uplink 4th data channel ODCH4 in response to the loss of the uplink packet data, and then every time a predetermined frame is delayed thereafter, the uplink 3 and The transmission related to the uplink 2nd and uplink 1st data channels ODCH3, ODCH2 and ODCH1 is stopped in order.

【0085】

As described above, according to the sixth embodiment, when the transmission of packet data is stopped, the transmission of all the data channel DCHs assigned to one call is not stopped at the same time, but a delay of a predetermined frame is applied. And stop the transmission one channel at a time. Therefore, it is possible to suppress a sudden decrease in transmission power. Therefore, the mobile station 1 and the base station 2 can perform closed-loop transmission power control satisfactorily.

【0086】

More specifically, when the data transmission is stopped at the mobile station 1, the mobile station 1 related to another user reduces the transmission power instructed by the base station 2 of the mobile station 1 that started the data transmission. It can be performed in accordance with the decrease in power. Further, when the data transmission to the mobile station 1 is stopped at the base station 2, the base station 2 stops the data transmission due to the decrease in the transmission power instructed by the mobile station 1 related to the other user. It can be performed in accordance with the decrease in power. Therefore, it is possible to suppress unnecessary power consumption of the mobile station 1 and the base station 2 related to other users.

【0087】

Embodiment 7 FIG. 14 is a diagram for explaining multi-code transmission of packet data according to the seventh embodiment of the present invention. The seventh embodiment is for more specifically explaining the sixth embodiment.

【0088】

The transmitting station uses the same parameters as the transmission start control process for the four data channels DCH1 to DCH4 assigned to one call. Specifically, the transmitting station uses the number of multi-codes Ccode, the number of simultaneous processing codes Cnum, and the number of delay frames Cfrm. Multi-code number Ccode indicates the number of data channels assigned to one call, as in the transmission start control process. The number of simultaneous processing codes Cnum indicates the number of channels that stop processing at the same time. The number of delay frames Cfrm indicates the delay width from the transmission stop related to other data channels. These parameters are preset as in the transmission start control process. In the example of FIG. 14, the number of multi-codes m, the number of simultaneous processing codes Cnum, and the number of delay frames Cfrm are set to 4, 1 and 1, respectively.

【0089】

When the packet data is lost from the transmission buffer 11a, the transmitting station starts to stop the transmission related to the four data channels DCH1 to DCH4 in response to the lost timing. In this case, the data frames to be transmitted at the same time in all the data channel DCHs are not eliminated, and usually disappear at different timings. Therefore, when there are no more data frames to be transmitted, the transmitting station transmits so-called idle frames (Idle).

【0090】

In the seventh embodiment, the third and fourth data channels DCH3 and DCH4 have no data frames at the same timing, and one frame later, the first and second data channels DCH1 and DCH2 have no data frames at the same timing. Therefore, when the transmission of the data frame related to the third and fourth data channels DCH3 and DCH4 is completed, the transmitting station transmits the idle frame in response to the end of the data frame.

【0091】

In such a situation, as shown in FIG. 14E, the transmitting station stops the transmission related to the fourth data channel DCH4 in response to the loss of packet data from the transmission buffer 11a. Specifically, in the case of the seventh embodiment, the transmission of the data frames in all the data channels ends at the timing of transmitting one idle frame via the fourth data channel DCH4. Therefore, the transmitting station stops the transmission related to the fourth data channel DCH4 when the transmission of the idle frame of the second frame is completed.

【0092】

Further, considering that 1 is set as the delay frame number Cfrm, the transmitting station considers that, as shown in FIG. 14 (d), the third data is obtained one frame after the transmission stop related to the fourth data channel DCH4. Stop the transmission related to channel DCH3. As described above, the third data channel DCH3 loses data frames at the same timing as the fourth data channel DCH4. Therefore, after transmitting 3 idle frames, which is one frame more than the 4th data channel DCH4, the transmission related to the 3rd data channel DCH3 is stopped.

【0093】

Further, as shown in FIG. 14 (c), the transmitting station stops the transmission related to the second data channel DCH2 one frame after the transmission stop related to the third data channel DCH3. In this case, after transmitting 3 idle frames, the transmission of the second data channel DCH2 is stopped.

【0094】

Furthermore, as shown in FIG. 14B, the transmitting station stops the transmission related to the first data channel DCH1 one frame after the transmission stop related to the second data channel DCH2. In this case, after transmitting 4 idle frames, the transmission of the first data channel DCH1 is stopped.

【0095】

FIG. 15 is a diagram for explaining multi-code transmission of packet data when the number of delay frames Cfrm is set to 2. That is, the transmitting station stops the transmission related to the third data channel DCH3 two frames after the transmission stop timing related to the fourth data channel DCH4. Further, the transmitting station stops the transmission related to the second data channel DCH2 two frames after the timing at which the transmission related to the third data channel DCH3 is stopped, and further, the transmission station is related to the first data channel DCH1 two frames later. Stop transmission.

【0096】

FIG. 16 is a diagram for explaining multi-code transmission of packet data when the number of delay frames Cfrm is set to 3 and the number of simultaneous processing codes Cnum is set to 2. That is, the transmitting station stops the transmission of the two data channels at the same time. More specifically, the transmitting station simultaneously transmits the second and first data channels DCH2 and DCH1 in response to the timing three frames after the transmission stop of the fourth and third data channels DCH4 and DCH3. Stop.

【0097】

As described above, according to the seventh embodiment, when the transmission of packet data is stopped, the transmission can be stopped in various patterns by appropriately setting the number of delay frames Cfrm and the number of simultaneous processing codes Cnum. Therefore, the reduction pattern of the transmission power can be arbitrarily set. Therefore, it is possible to realize desired transmission power control suitable for the surrounding radio wave environment.

【0098】

Embodiment 8 FIG. 17 is a flowchart for explaining the transmission stop control process according to the eighth embodiment of the present invention. The eighth embodiment is for more specifically explaining the sixth and seventh embodiments.

【0099】

This transmission stop control process is similar to the transmission start control process described with reference to FIG. 8 in the third embodiment. The differences are step U1, step U3, step U8, step U9 and step U10. That is, in step U1, it is a process of determining whether or not the packet data has disappeared from the transmission buffer 11a. Step U3 is a process of determining whether or not the number of currently used codes m is greater than 0, considering that the number of data channels used decreases each time transmission is stopped. That is, if the number of currently used codes is 0, there is no data channel to stop the transmission. Step U8 is a process of stopping the transmission related to the mth data channel DCHm. The difference in step U9 is that when the transmission related to one data channel DCH is stopped, the number of currently used codes m is decremented by one. Step U10 is a process for determining whether or not the number m of currently used codes is larger than 0 for the same reason as in step U3.

【0100】

Embodiment 9 FIG. 18 is a conceptual diagram for explaining the transmission stop control process according to the ninth embodiment of the present invention.

【0101】

In the above embodiments 6 to 8, the transmission stop control process is executed in response to the timing when the packet data disappears in the transmission buffer 11a. In this case, until the packet data is exhausted in the transmission buffer 11a, the transmission is continued via all the data channel DCHs assigned to one call, and then the transmission is stopped at different timings. On the other hand, in the ninth embodiment, the transmission via the data channel DCH is stopped at different timings in the situation where the packet data is still accumulated in the transmission buffer 11a.

【0102】

More specifically, this transmission stop control process is performed by the control unit 12. The control unit 12 determines the channel to stop the transmission based on the amount of data in the buffer Dbuf. More specifically, the control unit 12 determines the transmission stop channel based on the comparison result between the amount of data in the buffer Dbuf and the code m transmission stop threshold value Sth-m and the code m transmission stop time Tstp-m. .. Code m transmission stop threshold Sth-m and code m transmission stop time Tstp-m are the above code (m + 1) transmission start threshold Tth- (m + 1) and code (m + 1) transmission start time. Similar to Tstr- (m + 1), it is set to a value suitable for the transmission environment.

【0103】

More specifically, the control unit 12 constantly monitors the amount of data in the buffer, Dbuf. As a result of this monitoring, the transmission related to the 4th data channel DCH4 is stopped in response to the timing when the amount of data in the buffer Dbuf is equal to or less than the code 4 transmission stop threshold value Sth-4 over the code 4 transmission stop time Tstp-4. To do.

【0104】

Further, the control unit 12 determines that the amount of data in the buffer Dbuf is smaller than the code 4 transmission stop threshold Sth-4 over the code 3 transmission stop time Tstp-3 and is equal to or less than the code 3 transmission stop threshold Sth-3. In response to, the transmission related to the third data channel DCH3 is stopped. Further, the control unit 12 determines when the amount of data in the buffer Dbuf is less than or equal to the code 2 transmission stop threshold value Sth-2, which is smaller than the code 3 transmission stop threshold value Sth-3 over the code 2 transmission stop time Tstp-2. In response to, the transmission related to the second data channel DCH2 is stopped. Furthermore, the control unit 12 stops the transmission related to the first data channel DCH1 in response to the timing when the data amount Dbuf in the buffer is 0 over the code 1 transmission stop time Tstp-1.

【0105】

In this way, the transmission stop timing is determined based on the amount of data in the buffer Dbuf. Therefore, the delay width from the transmission stop of other data channels is relatively random. More specifically, as shown in FIG. 19, the delay width between the 4th data channel DCH4 and the 3rd data channel DCH3 is 2 frames, and between the 3rd data channel DCH3 and the 2nd data channel DCH2. The delay width is 1 frame, and the delay width between the 2nd data channel DCH2 and the 1st data channel DCH1 is 2 frames.

【0106】

As described above, according to the ninth embodiment, when the amount of data in the buffer Dbuf is equal to or less than the predetermined transmission stop threshold Sth-m over the predetermined transmission stop time Tstp-m, the data is sequentially transmitted for each data channel DCH. Will stop. Therefore, it is possible to prevent a sudden decrease in transmission power. Therefore, the mobile station 1 and the base station 2 can satisfactorily perform the closed-loop transmission power control as in the sixth embodiment. Therefore, wasteful power consumption of the mobile station 1 and the base station 2 can be suppressed.

【0107】

Moreover, the number of data channels used is reduced as the amount of data in the buffer Dbuf decreases. Therefore, it is possible to reduce the interference power to other users as compared with the case where all the data channels are continuously used until the amount of data in the buffer Dbuf becomes 0.

【0108】

Embodiment 10 FIG. 20 is a flowchart for explaining the transmission stop control process according to the tenth embodiment of the present invention. The tenth embodiment is for more specifically explaining the ninth embodiment.

【0109】

The control unit 12 first acquires the number of currently used codes m in response to the start timing of the possessed wireless frame (step U1). Next, the control unit 12 determines whether or not the acquired number m of currently used codes is larger than 0 (step U2). If the number of currently used codes m is less than 0 (NO in step U2), the transmission of all the data channels DCh assigned to one call is stopped, so the control unit 12 stops the transmission. Stop the control process.

【0110】

On the other hand, if the number of currently used codes m is larger than 0 (YES in step U2), is the control unit 12 whether the amount of data in the buffer Dbuf is equal to or less than the predetermined code m transmission stop threshold Sth-m? Determine if not (step U3). If the amount of data in the buffer Dbuf is larger than the code m transmission stop threshold value Sth-m (NO in step U3), the control unit 12 executes the stop processing (step U4) of the code m transmission stop timer Tstp-m. After that, the transmission stop control process is stopped.

【0111】

On the other hand, if the amount of data in the buffer Dbuf is equal to or less than the code m transmission stop threshold value Sth-m (YES in step U3), the control unit 12 determines whether or not the code m transmission stop timer Tstp-m has already been started. Determine (step U5). If the code m transmission stop timer Tstp-m has not been started (NO in step U5), the control unit 12 starts the code m transmission stop timer Tstp-m (step U6), and then ends the transmission stop control process. To do. On the other hand, if the code m transmission stop timer Tstp-m is activated (YES in step U5), the control unit 12 determines whether or not the code m transmission stop timer Tstp-m has timed out (step U7).

【0112】

If the code m transmission stop timer Tstp-m has not timed out (NO in step U7), the amount of data in the buffer Dbuf may only temporarily fall below the code m transmission stop threshold Sth-m, so control Unit 12 ends this transmission stop control process. After that, if the amount of data in the buffer Dbuf is equal to or less than the code m transmission stop threshold value Sth-m and the code m transmission stop timer Tstp-m has timed out after the elapse of the start timing of the next wireless frame (YES in step U7). ), The control unit 12 decrements one currently used code number m (step U8), and then terminates the communication via the mth data channel DCHm. After that, the control unit 12 returns to step U2, determines whether or not the transmission of all the data channel DCHs has been completed, and if all the transmissions have not been completed, repeats the process from step U3. To do.

【0113】

Other embodiments Although the description of the embodiment of the present invention is as described above, the present invention is not limited to the above-described embodiment. For example, in the above embodiment, the number of channels assigned to one call is set to 4. However, it goes without saying that the number of channels may be an integer other than 4.

【0114】

[Effect of the invention]

According to the present invention, when the data is generated in a situation where the first radio station prohibits the start of transmission until the generation of packet data related to one call, the data transmission is shifted by a predetermined time for each data channel. Start in order. Therefore, it is possible to suppress a rapid increase in transmission power as compared with the case where data transmission is started for all data channels at the same time.

【0115】

Therefore, it is possible to prevent a sudden increase in the interference power. Therefore, another first radio station different from the first radio station can increase the transmission power based on the instruction from the second radio station following the increase in the interference power. Therefore, deterioration of transmission quality between the first radio station and the second radio station can be prevented. Therefore, a highly reliable CDMA mobile communication system can be constructed.

【0116】

Further, in a situation where the first radio station continues transmission until the packet data related to one call is exhausted, when the data is lost, the data transmission is stopped in order by shifting the data transmission in units of data channels by a predetermined time. Therefore, it is possible to suppress a sharp decrease in transmission power as compared with the case where data transmission is stopped for all data channels at the same time.

【0117】

Therefore, it is possible to prevent a sudden decrease in the interference power. Therefore, another first radio station different from the first radio station can reduce the transmission power based on the instruction from the second radio station following the decrease in the interference power. Therefore, wasteful power consumption of the first radio station can be prevented.

【0118】

Further, when the data transmission is started based on the amount of data to be transmitted instead of the predetermined time, the data transmission is not started unless the amount of data exceeds the transmission start threshold value. Therefore, when the amount of data is small, The number of data channels used is limited. Therefore, when the amount of data is small, it is possible to suppress a rapid increase in transmission power as compared with the case where all data channels are used.

【0119】

Furthermore, when data transmission is started only when the state in which the amount of data to be transmitted is equal to or higher than the transmission start threshold value is maintained for the transmission start time, erroneous control due to sudden noise or the like is performed. Can be prevented.

【0120】

Furthermore, when data transmission is stopped based on the amount of data to be transmitted instead of a predetermined time, the use of the data channel is stopped during data transmission instead of after the data is lost. Therefore, the data channel is stopped only after the data is lost. It is possible to effectively suppress a sharp drop in transmission power compared to when the use is stopped.

【0121】

Furthermore, when data transmission is stopped only when the amount of data to be transmitted is less than or equal to the transmission stop threshold value for the transmission stop time, erroneous control due to sudden noise or the like is performed. Can be prevented.

【0122】

Further, when one or a plurality of data channels that start or stop transmission at the same time can be set, transmission power control suitable for the transmission environment can be realized.

[Simple explanation of drawings]

[Figure 1]

It is a conceptual diagram which shows the whole structure of the CDMA mobile communication system which concerns on Embodiment 1 of this invention.

[Figure 2]

It is a figure for demonstrating the multi-code transmission of the downlink packet data which concerns on Embodiment 1.

[Fig. 3]

It is a figure for demonstrating the multi-code transmission of the uplink packet data which concerns on Embodiment 1.

[Fig. 4]

It is a figure for demonstrating the multi-code transmission of the packet data which concerns on Embodiment 2 of this invention.

[Fig. 5]

Similarly, it is a figure for demonstrating the multi-code transmission of the packet data which concerns on Embodiment 2.

[Fig. 6]

Similarly, it is a figure for demonstrating the multi-code transmission of the packet data which concerns on Embodiment 2.

[Fig. 7]

It is a block diagram which shows the internal structure of the mobile station and the base station which concerns on Embodiment 3 of this invention.

[Fig. 8]

It is a flowchart for demonstrating the multi-code transmission of the packet data which concerns on Embodiment 3.

[Fig. 9]

It is a figure for demonstrating the multi-code transmission of the packet data which concerns on Embodiment 4 of this invention.

[Fig. 10]

It is a figure for demonstrating more concretely the multi-code transmission of the packet data which concerns on Embodiment 4.

[Fig. 11]

It is a flowchart for demonstrating the transmission start control process which concerns on Embodiment 5 of this invention.

[Fig. 12]

It is a figure for demonstrating the multi-code transmission of the downlink packet data which concerns on Embodiment 6.

[Fig. 13]

It is a figure for demonstrating the multi-code transmission of the uplink packet data which concerns on Embodiment 6.

[Fig. 14]

It is a figure for demonstrating the multi-code transmission of the packet data which concerns on Embodiment 7 of this invention.

[Fig. 15]

Similarly, it is a figure for demonstrating the multi-code transmission of the packet data which concerns on Embodiment 7.

[Fig. 16]

Similarly, it is a figure for demonstrating the multi-code transmission of the packet data which concerns on Embodiment 7.

[Fig. 17]

It is a flowchart for demonstrating the transmission stop control process which concerns on Embodiment 8 of this invention.

[Fig. 18]

It is a figure for demonstrating the transmission stop control process which concerns on Embodiment 9 of this invention.

[Fig. 19]

It is a figure for demonstrating the multi-code transmission of the packet data which concerns on Embodiment 9.

[Fig. 20]

It is a flowchart for demonstrating the transmission stop control process which concerns on Embodiment 10 of this invention.

[Fig. 21]

It is a figure for demonstrating the conventional multi-code transmission.

[Explanation of symbols]

1 mobile station, 2 base stations, 10 transmitters, 11 wireless frame generators, 11a transmission buffers, 12 controls, 14 diffusers, 20 receivers, 21 receiver amplifiers, 22 reverse diffusers, 23 demodulators, 30 antennas. Part, DCH data channel, CCH control channel, C1, C2, C3, C4 spread code, Tth- (m + 1) code m transmission start threshold, Tstr- (m + 1) code m transmission start time, Sth- m code m transmission stop threshold, Tstp-m code m transmission stop time.