JP2009089420A - Method and apparatus for data transmission in mobile communication system supporting enhanced uplink service - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for data transmission, in a mobile communication system supporting enhanced uplink service. <P>SOLUTION: The disclosed method includes the steps of: determining transmit power factors for a dedicated physical channel and an enhanced physical channel to confirm whether total transmit power required for transmission of the channels exceeds maximum allowed power; reducing the transmit power factor for an enhanced physical data channel in the enhanced physical channel, if the total transmit power exceeds the maximum allowed power; and transmitting data through the enhanced physical data channel using the transmit power factor reduced, corresponding to the enhanced physical channel; and transmitting data through the dedicated physical channel and enhanced physical control channel, by using the transmit power factors corresponding to the dedicated physical channel and the enhanced physical channel. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mobile communication system that supports an improved uplink service, and more particularly, to a power setting method and apparatus for transmitting data considering characteristics of an uplink channel.

  An enhanced uplink dedicated channel (hereinafter referred to as “E-DCH”) is an uplink packet of a wideband code division multiple access (hereinafter referred to as “WCDMA”) system. Proposed to improve the performance of transmission. In accordance with the introduction of E-DCH, in the uplink of Adaptive Modulation and Coding (AMC), Hybrid Automatic Retransmission Request (HARQ), and Node B controlled Scheduling The use of is being discussed.

FIG. 1 is a basic conceptual diagram showing a situation in which E-DCH is used.
Referring to FIG. 1, the base station 100 supports E-DCH, grasps channel conditions of terminals 101, 102, 103, and 104 that use E-DCH, and routes 111, 112, 113, and 114. Then, scheduling suitable for each terminal is performed. That is, the base station 100 maintains a noise increase value equal to or lower than a threshold noise increase value (Threshold Noise Rise Value) in order to improve the performance of the entire system, while the remote terminal 104 has a low data rate ( data rate) and a high data rate is assigned to the nearby terminal 101.

FIG. 2 shows a basic transmission / reception procedure of E-DCH.
Referring to FIG. 2, in step 203, the base station 200 and the UE 202 configure E-DCH. The setting of the E-DCH includes a procedure for transmitting a message via a dedicated transport channel.
In step 204, the UE 202 notifies the base station 200 of scheduling information. The scheduling information may be information on the UE's transmission power that can analogize the uplink channel information, or is stored in the UE's buffer and information on the remaining power at which the UE can transmit data. May include the amount of data to be transmitted.

In step 211, the base station 200 performs scheduling for several UEs including the UE 202 while monitoring scheduling information received from each UE.
If the base station 200 determines that the UE 202 allows uplink packet transmission, the base station 201 transmits scheduling assignment information to the UE 202 in step 205. Here, the scheduling allocation information may include retention (KEEP) / up (UP) / down (DOWN) regarding an allowed rate, an allowable timing, and an uplink data rate.
In step 212, the UE 202 determines a transmission format (Transport Format; hereinafter referred to as 'TF') of E-DCH transmitted through the uplink using the scheduling assignment information.

In step 206 and step 207, UE 202 transmits uplink (UL) packet data including TFRI (Transport Format Resource Indicator), which is information related to the determined TF, and E-DCH data, to base station 200. To do.
In step 213, the base station 200 determines whether there is an error in the information related to the TF and the E-DCH data. At this time, if there is even one error, the base station 200 determines negative acknowledgment (hereinafter referred to as NACK), and if there is no error, the base station 200 is referred to as positive acknowledgment (hereinafter referred to as ACK). ).
In step 208, the base station 200 transmits ACK / NACK information to the UE 202 through the ACK and NACK channels according to the result determined in step 213. At this time, when the UE 202 receives the ACK, new data is transmitted, and when the UE 202 receives the NACK, the previous data is retransmitted.

FIG. 3 shows an example of data transmission via E-DCH in a WCDMA system.
As shown in FIG. 3, when data 316 including video telephony to be transmitted, uploading of multimedia mails, games, etc. is generated, the UE 317 allocates to the physical channel 318. The data 316 is spread using the generated code and then transmitted to the base station 319.
The E-DCH is mapped and transmitted via an enhanced dedicated physical data channel (hereinafter referred to as 'E-DPDCH') that is improved by using a code multiplexing scheme. The E-DPDCH is a DPDCH to which a typical uplink transmission channel DCH of a UE is mapped, a DPCCH (Dedicated Physical Control Channel; hereinafter referred to as 'DPCCH') that carries control information related to the DPDCH, and the above You may coexist with E-DPCCH (henceforth called "E-DPCCH") which carries the control information relevant to E-DPDCH. The UE sets the transmission power of the physical channel according to the maximum transmission power allowed for the UE. The maximum transmission power is determined by the transmission capacity of the UE power amplifier and the minimum value of transmission power set in the network. At this time, the transmission power of the remaining physical channels excluding the DPCCH is determined according to the power ratio associated with the DPCCH.

FIG. 4 is a block diagram illustrating a configuration of a physical layer transmission side of a UE according to a conventional technique.
Referring to FIG. 4, the UE 317 encodes data transmitted through the data channel through the coding block 305. Also, control information necessary for receiving the data channel is generated separately. Here, the data channel means DPDCH or E-DPDCH, and the control channel means DPCCH or E-DPCCH.
The control information and the encoded data are modulated by modulators 300 and 306, respectively. The modulated control information and data are spread by the spreaders 301 and 307 using C _c and C _d which are channel division codes of the data channel and the control channel, respectively, and then the gain adjuster 302. , 308. The spread control information and data are multiplied by β _c and β _d which are gain factors given to the data channel and the control channel by the gain adjusters 302 and 308, and then multiplexed by the multiplexer 303. It becomes. The multiplexed data is input to a scrambler 304 and scrambled with a dedicated physical channel (DPCH) scrambling code S _{dpch, n} , and then an RF signal through an RF (Radio Frequency) unit 309. And is transmitted wirelessly by an antenna.

  The gain coefficient is a value for setting the power of the corresponding physical channel with reference to the power-controlled DPCCH, and is set according to the data size and service type of each physical channel. The gain coefficient, which is one of the elements constituting the transport format (TF), is set according to the transport format combination (hereinafter referred to as TFC). The gain coefficient is determined by an upper layer TFC selection unit that determines the format of transmission channel data, and is transmitted to the physical layer. The physical channel sets the transmission power of each physical channel according to the gain coefficient. At this time, the UE adjusts the gain coefficient of each physical channel so as not to exceed the maximum allowed power.

  When E-DCH is to be further used in addition to the transmission channels defined in the conventional system, if only TFCs that satisfy an allowable power level (level) are selected through the TFC selection, total transmission power (total When the transmit power exceeds the maximum allowed power, the gain factors of all physical channels are scaled equally by the same ratio. In the case of E-DCH, HARQ technology is supported. However, HARQ can be demodulated on the receiving side only by using the same transmission format as the initial transmission, even during retransmission. It is. Accordingly, when retransmitting E-DCH data, the TFC selection unit always selects the same TFC as the initial transmission regardless of the allowable TFC. In general, the transmission power during re-transmission is set to the same level as during initial transmission.

  In some cases, there is no DCH data during the initial transmission of E-DCH, and DCH data may be generated during retransmission. In addition, when the transmission time interval (hereinafter referred to as TTI) of E-DCH is set to be smaller than the minimum TTI of DCH, under the condition of fixed TF of DCH and fixed transmission power In some cases, E-DCH data must be retransmitted. In the above situation, if the UE uses the same power as the initial transmission for retransmission of E-DCH data, a result that the total transmission power exceeds the maximum allowable power may occur. By reducing the power of all physical channels to the same while maintaining the power ratio, all physical channels can be transmitted within the maximum allowable power, but the transmission quality of each physical channel cannot be guaranteed. .

FIG. 5 is a diagram illustrating an example of a problem that occurs during retransmission of E-DCH data according to the prior art.
As shown in FIG. 5, in time slot T1, the UE first transmits E-DCH data via E-DPDCH. Since there is no DCH data in the time slot T1, the total transmission power 401 does not exceed the maximum allowable power (Pmax) 407. However, in time slot T <b> 2 in which retransmission of E-DCH occurs, DCH data is transmitted via DPDCH, so that total transmission power 402 including E-DPDCH and DPDCH exceeds maximum allowable power (Pmax) 407. . Therefore, as indicated by reference numeral 405, the transmission powers of E-DPDCH, DPDCH, and DPCCH are adjusted at the same ratio. Therefore, after the transmission power of the physical channel is adjusted, the total transmission power 404 does not exceed the maximum allowable power 407 in the time slot T3.

However, since the E-DPDCH, DPDCH, and DPCCH in the time slot T3 are all transmitted using power smaller than that in the time slot T2, the quality of the physical channel is deteriorated on the receiving side. In particular, when the priorities of DCH and E-DCH are different, if the power of all the physical channels is always adjusted at the same ratio, the transmission quality of DCH or E-DCH may be reduced due to retransmission. For example, even if DCH is used for voice calls with high priority, retransmission of E-DCH data with low priority causes DCH data to be very large in some time slots within one TTI. The voice call quality may be deteriorated by being transmitted at a low power level.
Therefore, when there is an E-DCH that supports HARQ, a technique for more efficiently controlling the transmission power of each physical channel when the total transmission power of the UE exceeds the permitted maximum transmission power is required. It is coming.

In view of the above background, an object of the present invention is to efficiently reduce the transmission power of each physical channel when the total transmission power of the UE exceeds the maximum allowable power when supporting packet services via an uplink channel. It is to provide a method and apparatus for adjusting.
It is another object of the present invention to provide a method and apparatus for adjusting power of a specific transmission channel when E-DCH data is retransmitted.
It is another object of the present invention to provide a method and apparatus for adjusting E-DCH and DCH transmission powers differently according to transmission conditions and channel priorities.

  In order to achieve such an object, according to one aspect of the present invention, in a mobile communication system supporting improved uplink services, a dedicated physical channel in which a terminal does not support complex automatic retransmission request (HARQ) and A method of transmitting an enhanced physical channel supporting HARQ, wherein transmission power coefficients for the dedicated physical channel and the enhanced physical channel are determined, and a total transmission power required for transmission of the channel is a maximum allowable power. And, when the total transmission power exceeds the maximum allowable power, reducing the transmission power coefficient for the improved physical data channel among the improved physical channels; The enhancement using the reduced transmit power factor corresponding to the enhanced physical channel Transmitting the data channel, characterized in that it comprises the step of transmitting the physical control channel and the dedicated physical channel and improved by using the transmission power coefficient corresponding to the dedicated physical channel and enhanced physical channel.

  According to another aspect of the present invention, in a mobile communication system that supports an improved uplink service, a terminal that transmits a dedicated physical channel that does not support complex automatic retransmission request (HARQ) and an improved physical channel that supports HARQ. An apparatus for determining a transmission power coefficient for the dedicated physical channel and the enhanced physical channel and confirming whether a total transmission power required for transmission of the channel exceeds a maximum allowable power; When the total transmission power exceeds the maximum allowable power, a controller that decreases a transmission power coefficient for the improved physical data channel among the improved physical channels, and the dedicated physical channel and the improved physical channel. A channel generator for generating data frames by performing channel coding and modulation , Characterized in that it comprises a gain adjuster for adjusting the transmit power factor and the dedicated physical channel and improved transmission power coefficient of the physical data channel of a physical data channel and improvements said reduced.

  In the present invention, when data transmitted through the DCH is generated while performing the packet service through the E-DCH, and the total transmission power exceeds the maximum allowable power, the E-DPDCH having a lower priority is used. By reducing only the transmission power, there is an effect that it is possible to guarantee the transmission quality of other channels with higher priority and to efficiently use the transmission power of the UE.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, detailed descriptions of well-known functions or configurations are omitted to clarify only the gist of the present invention.
The present invention described below reduces the transmission power of the E-DPDCH to which the E-DCH is mapped when the total transmission power of the UE supporting the E-DCH exceeds the maximum allowable power of the UE. Guarantee the transmission quality of the remaining physical channels.

FIG. 6 shows an example of changing the transmission power of a UE according to an embodiment of the present invention.
Referring to FIG. 6, the UE first transmits E-DCH data via E-DPDCH in time slot T1. Since there is no DCH data in the time slot T1, the total transmission power 501 does not exceed the maximum allowable power (P _max ) 507. However, in time slot T <b> 2 in which retransmission of E-DCH data occurs, the total transmission power 502 exceeds the maximum allowable power 507 because the DCH data is transmitted via the DPDCH. At this time, as indicated by reference numeral 505, only the transmission power of E-DPDCH is reduced. As a result, after the transmission power of the E-DPDCH is reduced, the total transmission power 504 does not exceed the maximum allowable power 507 in time slot T3, and other channels, that is, E-DPCCH, DPDCH , And the DPCCH power level is kept the same as in time slot T2. Therefore, the problem that the power level of the DCH is reduced by the E-DCH can be avoided, and the DCH data can be transmitted stably.

  The transmission power of E-DCH and DCH is controlled by varying a transmission power coefficient set in advance for a physical channel to which the corresponding channel is mapped. In the WCDMA system, the transmission power coefficient means a unique gain factor of each channel. FIG. 6 shows a case where transmission of DCH data is preferentially guaranteed by adjusting the gain coefficient of E-DCH. Even when the E-DCH has a higher priority than the DCH, the transmission power of the DCH can be adjusted. In the following description, the transmission power is adjusted using the gain coefficient of each channel. Hereinafter, various embodiments of the present invention will be described.

First Embodiment In the first embodiment of the present invention, a gain factor of a specific channel, that is, E-DPDCH is further calculated so that the total transmission power does not exceed the maximum allowable power in the upper layer of the UE. Adjust the total transmit power. According to the first embodiment of the present invention, when E-DCH data and DCH data are all present, the UE checks whether the E-DCH data is retransmitted. If the result of the check indicates retransmission of E-DCH data, the gain coefficient of E-DPDCH to which E-DCH is mapped is reset at the corresponding transmission time.

FIG. 7 shows a procedure for setting the transmission power of the physical layer of the UE according to the first embodiment of the present invention.
Referring to FIG. 7, in step 601, the UE detects a transmission request for E-DPDCH / DPDCH / DPCCH data including a gain factor of each channel. In step 602, the UE that senses the transmission request estimates the total transmission power P _tx using the gain coefficient of the channel that should be transmitted. That is, the UE measures the transmission power of the UE in order to confirm the power state for each time slot. The UE estimates the total transmission power P _tx of the channel to be transmitted based on the measured transmission power and using a predetermined gain factor necessary for the next transmission.

In step 602, the UE checks whether the total transmission power P _tx exceeds the maximum allowable power P _max . If the total transmission power does not exceed the maximum allowable power, the UE proceeds to step 606 and transmits the data through each corresponding channel using the gain factor.
If the total transmission power exceeds the maximum allowable power, in step 603, the UE determines whether the E-DCH data transmitted via E-DPDCH is initial transmission data or retransmission data. to decide. As a result of the determination, if the E-DCH data is the first transmission, in step 604, the UE adjusts the power of all channels to the same level while keeping the power ratio between channels constant. In other embodiments, the UE defers data transmission on lower priority channels according to the priority of DCH data or E-DCH data and selects gain factors for other channels in a conventional manner, or First, the transmission power of a channel with a high priority is set, and the power for other channels is set so that the total transmission power does not exceed the maximum allowable power.

  If the E-DCH data is retransmitted as a result of the determination, in step 605, the UE further obtains a gain coefficient of E-DPDCH so that the total transmission power does not exceed the maximum allowable power. Only adjust the power of E-DPDCH. Hereinafter, a method for obtaining the gain coefficient will be described in detail. After completing Step 604 or Step 605, the UE proceeds to Step 606, and transmits the corresponding data through the channel using the gain coefficient of the E-DPDCH and the gain coefficient of another channel.

In FIG. 7, the procedure for determining whether the total transmission power exceeds the maximum allowable power (step 602) is a procedure for determining whether the E-DCH data is first transmission data or retransmission data. Even if it is described as preceding, the order of step 602 and step 603 may be changed.
When the total transmission power exceeds the maximum allowable power, it occurs only during one TTI, so the UE performs the procedure shown in FIG. 7 for each TTI. During actual transmission, if the total transmission power continuously increases based on power control and exceeds the maximum permissible power, all the conventional methods while maintaining the power ratio The power of the other channels is adjusted at the same ratio.

  The gain coefficient of E-DPDCH that prevents the total transmission power from exceeding the maximum allowable power can be obtained from the following equation (1). This means that the retransmission power of the E-DCH is decreased by a certain ratio with the previous transmission power within a range not exceeding the maximum allowable power.

Here, β _{e, ori} , β _c , and β _d indicate the gain factors of E-DPDCH / DPCCH / DPDCH determined by the TFC selector, and β _e indicates that the total transmission power is the maximum allowable power. Denote the new gain factor of E-DPDCH not to exceed, P _{tx, ori} indicates the total transmit power predicted using β _{e, ori} , β _c , and β _d , and the subscript 'ori' Indicates that the previous value to be adjusted, β _{e, ori,} has been applied to the estimation, P _max indicates the maximum transmit power allowed for the UE (ie, the maximum allowable power), and sqrt is Indicates the square root.

When the total transmission power exceeds the maximum allowable power, the above equation (1) indicates that a new gain of E-DPDCH for reducing the power of E-DPDCH while keeping the transmission power of DPDCH and DPCCH constant. It is a formula for obtaining the coefficient β _e . Β _e obtained by equation (1) is smaller than β _{e, ori} . That is, the UE can transmit the E-DPDCH within the total transmission power that does not exceed the maximum allowable power. If β _e calculated by equation (1) is an imaginary value, the transmission power of the E-DPDCH is regarded as zero. On the other hand, if β _e calculated by Equation 1 is smaller than a preset minimum value, the UE does not retransmit the E-DCH data in the current interval, and the E-DCH data in the next interval. A retransmission can be attempted.

In an environment where the E-DPCCH is transmitted only when the E-DPDCH exists, the E-DPCCH can be transmitted only when the E-DPDCH is retransmitted. In addition, when information indicating that the E-DPDCH power ratio is adjusted is necessary due to the configuration of the receiver of the base station scheduler, the UE adjusts the E-DPDCH power ratio by physical layer signaling. Information indicating this can be signaled to the base station.
In an environment serving the E-DCH, the transmission power of the E-DCH is adjusted through a gain factor of the E-DPDCH set according to the TF. Further, if necessary, the transmission power adjusted through the gain coefficient can be additionally adjusted. As an example, the transmission power of the E-DCH to be serviced is controlled according to the required quality of service (QoS). Here, when the transmission power is increased, one bit indicating the increase in the transmission power is included in the E-DCH control information and signaled to the base station. In another example, if the amount of E-DCH data to be transmitted is transmitted via E-DCH, the UE increases the transmission power of E-DCH. At this time, one bit for notifying the increase of the transmission power is included in the E-DCH control information and signaled to the base station via the E-DPCCH.

Hereinafter, a method for signaling information indicating that the transmission power of E-DPDCH is adjusted in the physical layer will be described.
A 1-bit indicator indicating that the transmission power of the E-DPDCH is adjusted is assigned to the E-DPDCH. Table 1 below shows the types of control information including a 1-bit indicator and the bit configuration according to each control information.

  The TFI (TF Index) is an index that informs the transmission format (TF) of the E-DCH transmitted to the corresponding TTI, and the 'Power de-boosting indicator' is an E-DCH according to the first embodiment of the present invention. This is an identifier indicating that the transmission power is reduced. 'Power boosting indicator' is an identifier indicating that the transmission power of E-DCH is increased in consideration of QoS, and 'MAC-e signaling indicator' is used to transmit buffer status information. , An identifier indicating that the transmission power of E-DCH is increased. NDI (New Data Indicator) is an identifier for notifying the first transmission packet as HARQ information. As described above, the E-DPCCH is assigned with a bit distinguished according to the control information.

  Here, 'Power de-boosting indicator', 'power boosting indicator', and 'MAC-e signaling indicator' are directly related to transmission power increase / decrease and / or normal transmission. In another embodiment of the control information as shown in FIG. 2, a 2-bit indicator is used.

  Table 2 shows a configuration of configuring physical layer signaling information for notifying power adjustment of E-DCH using a 2-bit power indicator. At this time, the power indicator shows contents as shown in Table 3 below.

  In Table 3, 'MAC-e signaling' generally means an increase in the transmission power of E-DCH. Therefore, in another embodiment, the 'Power indicator' has the contents shown in Table 4 below.

Hereinafter, with reference to FIG. 8, a UE transmission apparatus for realizing the first exemplary embodiment of the present invention will be described.
Referring to FIG. 8, the UE uses DPCCH, DPDCH, E-DPCCH, and E-DPDCH as uplink channels. The TFC selector 701 sets a corresponding gain coefficient in accordance with required conditions from the viewpoint of the data rate and transmission quality of the channel. The HARQ controller 726 transmits information for rate matching of data encoded to match the channel characteristics of the E-DCH to the rate matching unit 710 including the HARQ buffer, and sets the gain coefficient at the time of initial transmission and retransmission. HARQ information 702 for setting is transmitted to the physical channel transmission controller 706.

The physical channel transmission controller 706 sets parameters necessary for transmission of the physical channel. Specifically, the physical channel transmission controller 706 is received from the HARQ controller 726 indicating the initial transmission and retransmission information 702, the power parameters P _max , P _{tx, ori} 704, and the TFC selector 701. A new gain coefficient β _e of the E-DCH is reset according to the procedure shown in FIG. 6 with the gain coefficients β _{e, ori} , β _c , β _d 705.
When control information regarding DCH, that is, DPDCH is received, the DPCCH generator 719 generates the control information in a DPCCH frame, and the coding block 720 encodes the DPCCH frame. The encoded data is modulated by a modulator 721, spread by a DPCCH channel partition code C _c by a spreader 708, multiplied by a gain coefficient β _c of the DPCCH by a gain adjuster 722, and then multiplexed by a multiplexer 723. Is transmitted to.

When data transmitted via the DCH and E-DCH is received, the E-DPDCH generator 703 and the DPDCH generator 714 select the TFC information selected by the TFC selector 701 according to the transmission format of the corresponding channel. The coding blocks 709 and 715 encode the DCH frame and the E-DCH frame, respectively. The DPDCH data encoded by the coding block 715 is modulated by a modulator 716, spread by a DPDCH channel partition code C _d by a spreader 717, and multiplied by a gain coefficient β _d of the DPDCH by a gain adjuster 718. To the multiplexer 723.

The E-DPDCH frame generated by the E-DPDCH generator 703 is also encoded by the coding block 709 and then transmitted to the rate matching unit 710. The rate matching unit 710 performs rate matching of the encoded E-DPDCH data under the control of the HARQ controller 726. The rate matched data is modulated by a modulator 711, it is spread by a channelization code _{C e} of the E-DPDCH in a spreader 712, a gain controller 713 of DPCCH that is reset by the physical channel transmission controller 706 After being multiplied by the gain coefficient β _e , it is transmitted to the multiplexer 723.

Further, when control information related to the E-DCH including the TFC information selected for the E-DPDCH (that is, control information related to E-DPDCH) is received, the E-DPCCH generator 731 An E-DPCCH frame including control information related to DCH is generated. The E-DPCCH frame is encoded by a coding block 727, modulated by a modulator 728, spread by a spreader 729 with an E-DPCCH channel partition code _Cec , and a gain adjuster 730 gains an E-DPCCH gain coefficient β. After being multiplied by _ec , it is transmitted to the multiplexer 723.
Data from the gain adjusters 722, 718, 713, and 730 are multiplexed by a multiplexer 723, input to a scrambler 724, and scrambled by a scrambling code S _{dpch, n} , and then RF-processed by an RF unit 725. It is converted and transmitted.

Second Embodiment In the second embodiment of the present invention, when E-DCH data is retransmitted, if the total transmission power exceeds the maximum allowable power, the gain of E-DCH is set to a preset gain. The total transmission power is adjusted by decreasing the offset.
In the second embodiment of the present invention, when the total transmission power exceeds the maximum allowable power, a new gain coefficient of E-DPDCH is calculated by the following equation (2).

Here, delta _offset denotes the gain offset which can be set through higher layer signaling.

FIG. 9 shows a procedure for setting the transmission power of the physical layer of the UE according to the second embodiment of the present invention.
Referring to FIG. 9, in step 621, the UE senses a transmission request for E-DPDCH / DPDCH / DPCCH data constituting a gain factor of each channel. In step 622, the UE that senses the transmission request estimates the total transmission power P _tx using the gain coefficient of the transmitted channel. That is, the UE measures the transmission power of the UE in order to confirm the power state for each slot. The UE estimates the total transmission power P _tx of the channel to be transmitted based on the measured transmission power and using a predetermined gain factor necessary for the next transmission.
In step 622, UE checks if exceeds the maximum allowed power _{P max} of the total transmit power _{P tx} is set in advance. If the total transmission power does not exceed the maximum allowable power, the UE proceeds to step 626 and transmits the data through each corresponding channel using the gain factor.

  If the total transmission power exceeds the maximum allowable power, the UE determines in step 623 whether the E-DCH data transmitted via the E-DPDCH is initial transmission data or retransmission data. To do. If the E-DCH data is the first transmission as a result of the determination, in step 624, the UE adjusts the power of all channels to the same level while keeping the power ratio between channels constant. In other embodiments, the UE defers data transmission on lower priority channels according to the priority of DCH data and E-DCH data and selects gain factors for other channels in a conventional manner, or First, the transmission power of a channel with a high priority is set, and the power for other channels is set so that the total transmission power does not exceed the maximum allowable power.

  If the E-DCH data is retransmitted as a result of the above determination, in step 625, the UE further determines the gain coefficient of E-DPDCH and adjusts only the power of E-DPDCH. At this time, the gain coefficient is decreased by a preset gain offset as shown in Equation (2). After step 624 or step 625 is completed, the UE proceeds to step 626 and transmits the corresponding data through the channel using the gain coefficient of the E-DPDCH and the gain coefficient of another channel.

Since the UE transmission apparatus according to the second embodiment is the same as that shown in FIG. 8, the second embodiment will be described below with reference to FIG. Here, the rest of the configuration excluding the physical channel transmission controller 706, the HARQ controller 726, and the rate matching unit 710 of the transmission device is the same as the configuration of FIG. Is omitted.
The physical channel transmission controller 706 takes charge of the function of resetting the gain coefficient of the E-DPDCH, and sets parameters necessary for transmission of the physical channel. Specifically, when the total transmission power P _{tx, ori} exceeds the maximum allowable power P _max , the physical channel transmission controller 706 receives information 702 indicating the initial transmission and retransmission received from the HARQ controller 726. The new gain coefficient β _e is obtained according to the procedure shown in FIG. 7 using the power parameters P _max , P _{tx, ori} 704 and the gain coefficients β _{e, ori} , β _c , β _d 705 received from the TFC selector 701.

  If the total transmission power exceeds the maximum allowable power even after adjusting the gain coefficient of the E-DPDCH, the transmission power of other channels is reduced while keeping the power ratio between channels constant. In addition, when information indicating that the E-DPDCH power ratio is adjusted is necessary due to the configuration of the receiver of the base station scheduler, the UE adjusts the E-DPDCH power ratio by physical layer signaling. Information indicating this can be signaled to the base station. In such a case, physical layer signaling notifying that the transmission power of the E-DPDCH has been adjusted is performed using a 1-bit identifier or a 2-bit identifier as described in the first embodiment of the present invention. May be.

Third Embodiment In the third embodiment of the present invention, the UE selects the gain factor of the E-DPDCH so that the total transmission power does not exceed the maximum allowable power considering retransmission. Adjust the channel power. In the third embodiment of the present invention, when DCH occurs at the time of retransmission of E-DCH unlike the initial transmission, the gain coefficient is selected in a procedure different from the initial setting in the procedure for selecting TFC.
In particular, the UE checks the transmission power for each of a plurality of channels to be transmitted, and reduces the transmission power of a specific channel step by step according to the channel priority. The priority may be determined according to whether the corresponding channel is a channel for which retransmission is guaranteed or a control channel.

  First, a transmission environment will be described in order to help understanding of the present embodiment. In the transmission environment according to the present embodiment, one DCH and one E-DCH are set simultaneously, and possible transmission format combinations (TFC) of each channel are set as shown in Tables 5 and 6 below. Since there is one DCH, the TFC actually includes a TF set (TF set) constituting each TF, and the TF of the E-DCH is represented by E-TF in Table 6. As shown in Tables 5 and 6, TF can transmit more data as the index value is larger. Tables 5 and 6 show cases in which DCH and E-DCH are mapped and transmitted via different physical channels. When DCH and E-DCH are mapped and transmitted via the same physical channel, a gain coefficient is set according to each TFC.

In the present embodiment, for the sake of brevity of the present invention, a detailed description of the scheduling operation required for E-DCH is omitted, and it is assumed that resources are allocated so that transmission of E-DCH is possible.
When DCH and E-DCH are mapped to different physical channels, the total transmission power that can be used by the UE is the sum of the transmission powers of all physical channels. The TFC that can be transmitted is set in consideration of the above.

  On the other hand, if there is E-DCH data to be retransmitted, the UE sets the same E-TF as the E-TF at the time of initial transmission. This is because the DCH has a higher priority than the E-DCH at the time of retransmission, and the same E-TF as at the time of initial transmission may not be selected. Such cases may also occur due to channel conditions or scheduling.

Specifically, it is as follows.
The UE compares the E-TF of the initial transmission with the E-TF of the retransmission. If the E-TF index of the first transmission is less than or equal to the E-TF index of the retransmission, the UE determines that it can sufficiently support the E-TF of the first transmission, and the E of the first transmission -Select TF and the corresponding gain factor. However, if the E-TF index of the first transmission is larger than the E-TF index of the retransmission, the UE selects the same E-TF as the E-TF of the first transmission and adjusted for retransmission. Select a new gain factor. An example of setting the gain coefficient according to Table 6 is shown in Table 7.

  Referring to Tables 6 and 7, if E-TF = 2 is selected during the initial transmission, the UE transmits (2 × 300) bits of data using the gain coefficient = beta6. At the time of retransmission, if DCH data exists and the amount of data that can be transmitted by the UE via E-DCH is limited to E-TF = 1, the UE may use the TFC for DCH among the allowable TFCs. And E-TF = 1 and gain coefficient = beta5 are selected through a procedure for selecting E-TF of E-DCH that can be transmitted using the remaining power. Since E-TF = 2 of the initial transmission is larger than E-TF = 1 of the retransmission, E-TF_new = 2 and gain coefficient = beta5 are selected for E-DCH at the time of retransmission.

  Hereinafter, a process of selecting a TFC with the above-described channel setting according to the third embodiment of the present invention will be described with reference to FIG. In this embodiment, it is assumed that the TCHs of DCH and E-DCH are the same, and TFC selection can always be performed at the same time. When TFC selection for DCH and E-DCH is different from each other or because TTI of both channels is different from each other, TFC selection cannot be performed at the same time. A TFC selection of a channel is performed, and a TFC selection process of another channel is performed using the remaining power.

FIG. 10 illustrates a process of selecting a TFC according to the third embodiment of the present invention.
Referring to FIG. 10, in step 802, the UE checks whether DCH data and E-DCH data exist.
If only the DCH data exists as a result of the above check, in step 804, the UE selects a TFC for the DCH among the allowable TFCs through a normal TFC selection process. If only E-DCH data is present, in step 803, the UE selects an E-TF of E-DCH within a transmittable data rate.
If all the E-DCH data and DCH data are present as a result of the inspection, in step 805, the UE sets the priority of E-DCH (Priority of E-DCH; P_EDCH) to the priority of DCH (P_DCH). Compare with

If the priority of the DCH (P_DCH) is higher than the priority of the E-DCH as a result of the comparison, in step 806, the UE first selects a TFC necessary for transmission of DCH data from among allowable TFCs. In step 808, the power allocated to the TFC selected for the DCH is excluded, and the E-TF for transmitting data via the E-DCH is selected in the remaining power. Later, proceed to step 810.
On the other hand, if the priority of E-DCH (P_EDCH) is higher than the priority of DCH (P_DCH) as a result of the comparison, in step 807, the UE first selects E-DCH among the allowable E-TFs. The E-TF is selected, and the process proceeds to step 809 to exclude the power allocated to the selected E-TF for the E-DCH, and to transmit the DCH data within the remaining power. After selecting, go to step 810. In another embodiment, when all of the E-DCH data and DCH data are present, the UE defers transmission of one channel according to the priority order of the two channels, and in a conventional manner, After selecting TF, go to step 815.

  In step 810, the UE determines whether E-DCH data is transmitted initially or retransmitted. If the E-DCH data is transmitted for the first time as a result of the determination, in step 815, the UE transmits the E-DCH data via the selected E-TF. On the other hand, if the E-DCH data is retransmitted as a result of the determination, the UE proceeds to step 811 and sets the E-TF (TF_initial) selected at the time of initial transmission to steps 803, 807, or 808. To the E-TF selected in (i.e., TF_re).

  In step 812, if the index of the first transmission E-TF (TF_initial) is smaller than or equal to the index of the retransmission E-TF (TF_re), in step 813, the UE transmits the first transmission E-TF. (TF_initial) and a corresponding gain factor (gain factor (TF_initial)) are selected. On the other hand, if the index of the first transmission E-TF (TF_initial) is larger than the index of the retransmission E-TF (TF_re) as a result of the comparison, in step 814, the UE performs the first transmission E-TF. A new TF (TF_new) is selected, and a gain factor (gain factor (TF_re)) of retransmission E-TF is selected as a new gain factor. Thereafter, in step 815, the UE transmits DCH data and E-DCH data using the E-TF, TFC, and gain factor selected in steps 802 to 814, respectively.

FIG. 11 shows a UE transmission apparatus according to the third embodiment of the present invention. Here, the UE uses DPCCH, DPDCH, E-DPDCH, and E-DPCCH as uplink channels. However, for convenience of explanation, the configuration related to E-DPCCH is omitted.
Referring to FIG. 11, the TFC selector 901 determines the transmission format (TF) of the channel. The TFC selector 901 receives the predicted total transmission power P _tx information 902 and maximum allowable power P _max information 903 and receives HARQ information 904 indicating initial transmission / retransmission from the HARQ controller 913. The TFC selector 901 performs the procedure shown in FIG. 10 to determine the TFC, E-TF, and gain coefficient, and performs physical channel transmission control on the information 905 on the determined TFC, E-TF, and gain coefficient. To the device 906. The physical channel transmission controller 906 sets the gain coefficient 907 in the gain adjusters 926, 921, and 916 corresponding to the corresponding channel.

When control information 908 related to DCH, that is, DPDCH, is received, DPCCH generator 922 generates control information 908 in a DPCCH frame, and coding block 923 encodes the DPCCH frame. The encoded data is modulated by a modulator 924, spread by a DPCCH channel partition code C _c by a spreader 925, multiplied by a gain coefficient β _c of the DPCCH by a gain adjuster 926, and then multiplexed by a multiplexer 927. Is transmitted to.

When data 909 transmitted via the DCH and E-DCH is received, the E-DPDCH generator 910 and the DPDCH generator 917 receive the data 909 according to the TFC information selected according to the transmission format by the TFC selector 901. The coding blocks 918 and 911 encode the DPDCH frame and the E-DPDCH frame, respectively. DPDCH data encoded in the coding block 918 is modulated by a modulator 919, is transmitted to the spreader 920 is spread by a channelization code _{C d} of the DPDCH, it is multiplied by a gain factor beta _d of DPDCH in a gain scaler 921 Is transmitted to the multiplexer 927.

The E-DPDCH data encoded by the coding block 911 is transmitted to the rate matching unit 912. The rate matching unit 912 performs rate matching of the encoded E-DPDCH data under the control of the HARQ controller 913. The rate matched data is modulated by a modulator 914, it is spread by a channelization code _{C e} of the E-DPDCH in spreader 915, gain adjuster 916 is set by the physical channel transmission controller 906 the E-DPDCH After being multiplied by the gain coefficient β _e of the signal, it is transmitted to the multiplexer 927.
Data from the gain adjusters 926, 921, 916 are multiplexed by a multiplexer 927, input to a scrambler 928, scrambled with a scrambling code S _{dpch, n} , and then RF-converted through an RF unit 929. Is transmitted.

Fourth Embodiment In the fourth embodiment of the present invention, when the total transmission power of the UE exceeds the maximum allowable power, the transmission power of the E-DPDCH is preferentially reduced. According to the fourth embodiment, the E-DCH gain coefficient is recalculated for each slot, which is a power control unit, so that the total transmission power does not exceed the maximum allowable power. Regardless of the initial transmission or retransmission, the E-DCH gain factor is reset even when the total transmission power exceeds the maximum allowable transmission power. This is because the total transmission power of the UE is controlled by a transmit power control (TPC) command received from the base station for each slot. Specifically, the TPC command is applied to DPCCH power adjustment. Since the power ratio between DPCCH and DPDCH / E-DPDCH / E-DPCCH is held by the gain coefficient of the corresponding channel, the TPC command is related to the total transmission power of the UE.

  FIG. 12 checks whether or not the total transmission power exceeds the maximum allowable power for each slot, and when the total transmission power exceeds the maximum allowable power, the E-DPDCH to which the E-DCH is mapped is checked. An example of adjusting only the transmission power is shown. Since E-DPCCH carries control information for E-DPDCH demodulation and decoding, reliability must be guaranteed. Therefore, even when the E-DPDCH transmission power is adjusted, the E-DPCCH power ratio 800 is maintained.

  Referring to FIG. 12, the TPC command continuously indicates power increase (UP) within one TTI, and the total transmission power exceeds the maximum allowable power. Reference numeral '802' indicates transmission power setting according to the prior art, and when the total transmission power reaches the maximum allowable power, all the TPC commands for instructing power increase are continuously received. The channel transmit power is reduced at the same rate. Reference numeral '804' indicates transmission power setting according to the fourth embodiment of the present invention, and after the total transmission power reaches the maximum allowable power, a TPC command instructing power increase continues. When received, only the transmission power of E-DPDCH is decreased, and the transmission power of other channels DPDCH / E-DPCCH / DPCCH is increased at the same ratio while maintaining a preset power ratio.

  Even if the transmission power of the E-DPDCH is decreased by a certain ratio, when the total transmission power exceeds the maximum allowable power, the operation of adjusting the transmission power of the E-DPDCH can be repeated. At this time, if the transmission power of the E-DPDCH becomes a preset minimum value, for example, 0, the E-DPDCH is not transmitted. Nevertheless, when the total transmission power exceeds the maximum allowable power, the transmission power of each channel is reduced while maintaining the power ratio for the remaining channels.

Hereinafter, the procedure for setting the transmission power of the UE according to the fourth embodiment of the present invention will be described in detail with reference to FIG.
Referring to FIG. 13, in step 1301, the physical layer of the UE confirms whether or not it is the transmission time of E-DPDCH, DPDCH, DPCCH, or E-DPCCH for each slot, and transmits the physical channel. At the time, the UE compares the total transmission power P _tx of the physical channel with a preset maximum allowable power P _max . Here, the total transmission power is a transmission power predicted according to the TPC command received from the base station.

As a result of the comparison, when the total transmission power P _tx exceeds the maximum allowable power P _max , the process proceeds to step 1303. At this time, P _tx becomes P _{tx, ori} in Equation 1. The UE obtains a gain factor of E-DPDCH in which the total transmission power P _tx does not exceed the maximum allowable power P _max . The method for obtaining the gain coefficient can be obtained by a method such as Equation (1). As another example, the UE can reduce the gain coefficient of the E-DPDCH by a predetermined gain offset as shown in Equation (2). After obtaining the gain factor, the UE proceeds to step 1304.

In step 1304, it is further compared whether the total transmission power to which the obtained gain coefficient is applied exceeds the maximum allowable power. Here, P _tx ′ means the total transmission power updated by applying the new gain coefficient β _e obtained in step 1303. At this time, if the total transmission power still exceeds the maximum allowable power, the UE proceeds to step 1305. Here, when using Equation (2), the UE repeats Step 1303 while gradually decreasing the gain coefficient of the E-DPDCH until the total transmission power does not exceed the maximum allowable power. be able to.

As a result of the comparison in step 1304, the transmission power of E-DPDCH, that is, the minimum possible transmission power updated by applying the gain coefficient calculated in step 1303, for example, becomes zero, and the E-DPDCH is transmitted. If the total transmit power still exceeds the maximum allowable power, the UE proceeds to step 1305 because it can be considered that the UE has insufficient power resources. In step 1305, the other channel E-DPCCH / DPDCH / DPCCH has the same power ratio, and the total transmission power can be reduced while maintaining the same power ratio. Ask for. That is, in step 1305, the power ratio between DPCCH and E-DPCCH, between DPCCH and DPDCH, and between DPCCH and E-DPCCH is kept constant. The above steps are performed for each slot. Even in a slot where the E-DPDCH is not transmitted, the E-DPCCH is transmitted while maintaining reliability, so the E-DPCCH is transmitted with a transmission power reduced at the same rate as other channels.
In step 1306, the UE transmits E-DPDCH / DPDCH / DPCCH / E-DPCCH data with transmission power according to the obtained gain factor.

  FIG. 14 shows a UE transmission apparatus according to a fourth embodiment of the present invention. In FIG. 14, the transmission apparatus is configured such that the UE performs DPDCH / DPCCH / E-DPDCH / E-DPCCH transmission. In the UE, DPCCH / DPDCH / E-DPCCH generators 1413, 1414, 1415, 1404, a rate matching unit 1420, and a HARQ controller 1407, which are the same parts as those described with reference to FIGS. Coding blocks 1417, 1418, 1419, 1416, modulators 1422, 1423, 1424, 1425, spreaders 1426, 1427, 1428, 1429, gain adjusters 1430, 1431, 1432, 1433, and channel multiplexing. A detailed description of the device 1434 and the scrambler 1435 will be omitted, and only the portion directly related to the fourth embodiment of the present invention will be described.

When data transmission is requested, the TFC selector 1401 selects a TFC for the E-DCH data 1402 and the DCH data 1403, and gain coefficient values 1405 corresponding to the TFC, that is, β _{e, ori} , β _ec , β _c and β _d are transmitted to the physical channel transmission controller 1408. Further, the physical channel transmission controller 1408 receives the maximum allowable power information 1405. The power amplifier controller 1409 controls the power amplifier 1412 using the power offset P _offset according to the TPC command received from the base station for each slot, and the transmission power value P_est 1410 predicted according to the TPC command is calculated as the total transmission power P _tx. To the physical channel transmission controller 1408. The physical channel transmission controller 1408 resets the gain coefficient of each channel according to the procedure shown in FIG. 13 using the total transmission power value 1410, and resets the gain coefficients β _c , β _d , β _ec , β _e is provided to gain adjusters 1430, 1431, 1432, 1433.

In the fourth embodiment of the present invention, when the E-DPDCH gain coefficient is recalculated for each slot so that the total transmission power does not exceed the maximum allowable power, the total transmission power P_est is determined from the power amplifier controller 1409 for each slot. Receive. However, due to the structural characteristics of the UE in which the RF unit and the modem are separated, the physical channel transmission controller 1408 cannot receive the total transmission power information from the power amplifier controller 1409 for each slot. .
Therefore, to solve such a problem, FIG. 15 shows another example of the transmission apparatus according to the fourth embodiment of the present invention.

  In the modified fourth embodiment, the power amplifier controller 1509 does not transmit P_est for each slot to the physical channel transmission controller 1508, but transmits P_est for each preset specific slot. In such a case, the physical channel transmission controller 1508 cannot accurately recognize P_est in the remaining slots excluding the specific slot, and therefore all possible P_est values for the specific slot and the remaining slot. And calculate a gain coefficient of E-DPDCH with respect to the predicted P_est value. Here, the P_est value of the remaining slot is obtained by adding a power control unit value according to TPC (hereinafter referred to as 'Delta') to the P_est value of the specific slot or by calculating the TPC from the P_est value of the specific slot. Is obtained by subtracting Delta according to

As an example, when transmitting P_est every two slots, the form of the predicted gain coefficient is as follows.
First slot: P_est0⇒β ~ _e0
Second slot: When receiving TPC UP
P_est1_up = P_est0 + Delta → _{β to e0_up}
When receiving TPC DOWN,
P_est1_down = P_est0−Delta → _{β to e0_down}
Note that the above β is

. The same shall apply hereinafter.
In the above example, the UE receives P_est0 every second slot and performs the procedure of FIG. 13 based on the P_est0 to calculate the E-DPDCH gain coefficients β to _e0 , and then the next slot The gain coefficients β to _el for the next slot are calculated according to the predicted total transmission powers β to _el . At this time, in the next slot, when the UP TPC command is received and the DOWN TPC command is received, _β to _{e0_up} and _β to _{e0_down} are all obtained.
As described above, the physical channel transmission controller 1508 calculates three β to _e values in advance and selects one of the three β to _e values based on the TPC command received for each slot. Apply.
When P_est0 is transmitted from the power amplifier controller 1509 for each 'K' slot, the number M of predicted gain coefficients in other slots is 2 ^(k−1) .

  In FIG. 15, the same parts as those described with reference to FIGS. 8 and 11, that is, DPCCH / DPDCH / E-DPDCH generators 1513, 1514, 1515, 1504, rate matcher 1520, HARQ controller 1507, coding blocks 1517, 1518, 1519, 1516, modulators 1522, 1523, 1524, 1525, spreaders 1526, 1527, 1528, 1529, gain adjusters 1530, 1531, 1532, 1533, channel multiplexer 1534, and A description of the scrambler 1535 is omitted, and a portion directly related to the fourth embodiment of the present invention will be described.

The TFC selector 1501 selects a TFC for the E-DCH data 1502 and the DCH data 1503, and transmits a gain coefficient value 1505 corresponding to the TFC, that is, β _{e, ori} , β _ec , β _c and β _d to the physical channel. Transmit to the controller 1508. Further, the physical channel transmission controller 1508 receives information related to the maximum allowable power (P _max ) 1506. The power amplifier controller 1509 controls the power amplifier 1512 according to the TPC command received from the base station for each slot, and calculates the total transmission power value (P_est0) 1510 predicted according to the TPC command in a specific slot set in advance. The data is transmitted to the physical channel transmission controller 1508.

The physical channel transmission controller 1508 receives P_est01510 for each specific slot, obtains the gain coefficient 1543 of each channel, and provides it to the gain adjusters 1530, 1531, 1532, and 1533. In particular, for the other slots except the specific slot, capable P_estk_up / down (k = 1,2, ..., 2 (K-1)) to predict, on the predicted P_estk_up / down On the other hand, all possible gain coefficients _{β˜ek_up} , _{β˜ek_down} of E-DPDCH are calculated respectively. After calculating all the possible gain factors, the physical channel transmission controller 1508 receives the TPC command for each kth slot after the specific slot, and calculates the corresponding gain factor _{β˜ek_up} or _{β˜ek_down} . E-DPDCH gain adjuster 1533. At this time, the transmission power of other channels excluding E-DPDCH can be adjusted by the power amplifier 1512 at the same ratio.

Fifth Embodiment In the fifth embodiment of the present invention, when the total transmission power of the UE exceeds the maximum allowable power, the E-DPDCH power is preferentially reduced, and then the channel with the lower priority is used. The power of other channels is sequentially reduced in the order of channels with higher priority.
First, suppose a situation where DPDCH, DPCCH, E-DPDCH, and E-DPCCH exist. At this time, in order to set the priority order of each channel, whether or not the corresponding channel is a control channel is considered after giving priority to whether or not the corresponding channel supports retransmission. In this case, the channel priority may be set in the order of DPCCH / E-DPCCH / DPDCH / E-DPDCH. In addition, when considering whether the corresponding channel is a control channel or not, and considering whether the corresponding channel supports retransmission, the order of DPCCH / DPDCH / E-DPCCH / E-DPDCH The priority of each channel may be set.

Hereinafter, a case where the priority order of each channel is set in the order of DPCCH / E-DPCCH / DPDCH / E-DPDCH will be described as an example. First, when the total transmission power of the UE exceeds the maximum allowable power, the UE adjusts the transmission power of the E-DPDCH with the lowest priority using a gain coefficient or a power offset value, and the other channels The power adjustment is not performed.
If the total transmission power of the UE exceeds the maximum allowable power even though the transmission power of the E-DPDCH is set to a preset minimum value, for example, 0, the transmission power of the E-DPCCH is adjusted. However, power adjustment is not performed for other channels. At this time, since the E-DPCCH carries control information essential for the demodulation and decoding of the E-DPDCH, the E-DPCCH is adjusted to maintain a preset minimum power (not 0). . Similarly, when the total transmission power of the UE exceeds the maximum allowable power even though the transmission power of the E-DPCCH is set as the minimum power, other channels, that is, DPCCH and DPDCH Power adjustment is sequentially performed so as to maintain a preset minimum power.

Sixth Embodiment In the sixth embodiment of the present invention, when the total transmission power exceeds the maximum allowable power and the maximum allowable power is exceeded, E− is used as the unit of the minimum TTI. Reduce the transmission power of DPDCH. The E-DPDCH transmission power can be reduced by adjusting the gain factor of the E-DPDCH.
The total transmission power exceeds the maximum transmission power due to the power control generated in the slot unit, despite the fact that the transmission power of the E-DPDCH is decreased in the minimum TTI unit. In this case, while maintaining the power ratio between channels, the transmission power of all channels is reduced at the same ratio so that the total transmission power does not exceed the maximum allowable power. In this case, the channel means DPDCH, DPCCH, E-DPCCH, etc. including E-DPDCH.

Specifically, when the E-DPDCH is set to a TTI of 2 ms or 10 ms and there is a DPDCH to be transmitted to a TTI of 10 ms or more, the UE is in a 2 ms TTI unit that is the minimum TTI of the E-DPDCH. Then, it is checked whether the total transmission power exceeds the maximum allowable power, and the transmission power of E-DPDCH is adjusted in units of 2 ms. Then, if there are 15 slots in the 10ms TTI and 3 slots in the 2ms TTI, the UE adjusts the transmission power of the E-DPDCH in units of 2ms, and then The total transmission power is adjusted in consideration of power control in units.
A specific execution procedure of the UE operating in the above-described manner is the same as that of the fourth embodiment. However, it is desirable that the period for performing the above operation is set to a minimum TTI unit, particularly an E-DPDCH minimum TTI, instead of a slot unit.

  The details of the present invention have been described above based on the specific embodiments. However, it is apparent that various modifications can be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the above-described embodiment, but should be determined by the description of the claims and the equivalents thereof.

FIG. 5 is a basic conceptual diagram illustrating a situation where E-DCH is used for conventional data transmission. It is a figure which shows the basic transmission / reception procedure of the conventional E-DCH. It is a figure which shows an example of the data transmission via the conventional E-DCH in a WCDMA system. It is a block diagram which shows the structure of the transmission side of UE by a prior art. It is a figure which shows an example of the problem which generate | occur | produces during retransmitting the E-DCH data by a prior art. It is a figure which shows an example which changes the transmission power of UE by embodiment of this invention. It is a flowchart which shows the procedure which sets the transmission power of the physical layer of UE by the 1st Embodiment of this invention. It is a block diagram which shows the transmitter of UE by the 1st Embodiment of this invention. 7 is a flowchart illustrating a procedure for setting transmission power of a physical layer of a UE according to the second embodiment of the present invention. It is a flowchart which shows the procedure which selects the transmission format combination (TFC) by the 3rd Embodiment of this invention. It is a block diagram which shows the transmitter of UE by the 3rd Embodiment of this invention. It is a figure which shows the power setting of UE by the 4th Embodiment of this invention compared with a prior art. It is a figure which shows the power setting procedure of UE by the 4th Embodiment of this invention. It is a block diagram which shows an example of the transmitter of UE by the 4th Embodiment of this invention. It is a block diagram which shows the other example of the transmitter of UE by the 4th Embodiment of this invention.

Explanation of symbols

701 TFC selector 703 E-DPDCH generator 706 Physical channel transmission controller 708, 712, 717, 729 Spreader 709, 715, 720, 725 Coding block 710 Rate matcher 711, 716, 721, 728 Modulator 713, 718 722, 730 Gain adjuster 714 DPDCH generator 719 DPCCH generator 723 Multiplexer 724 Scrambler 725 RF unit 726 HARQ controller

Claims (14)

In a mobile communication system supporting improved uplink services, a terminal transmits a dedicated physical channel that does not support complex automatic retransmission request (HARQ) and an improved physical channel that supports HARQ.
Determining transmission power coefficients for the dedicated physical channel and the enhanced physical channel and checking whether the total transmission power required for transmission of the channel exceeds a maximum allowable power;
Reducing the transmit power factor for an improved physical data channel among the improved physical channels when the total transmit power exceeds the maximum allowable power; and
Transmit the enhanced physical data channel using the reduced transmission power factor corresponding to the enhanced physical channel, and use the dedicated physical channel and the dedicated transmission power factor corresponding to the enhanced physical channel to transmit the dedicated physical data channel. Transmitting a physical channel and an enhanced physical control channel. Said reducing step comprises:
The method of claim 1, wherein the method is performed on a slot basis. Said reducing step comprises:
When a dedicated physical data channel is set, the minimum value of the transmission power coefficient for the improved physical data channel is set to 0;
Set the improved physical data channel to not transmit,
The method according to claim 1, wherein if the dedicated physical data channel is not set, the minimum value of the transmission power coefficient for the enhanced physical data channel is set to a preset β value to be reduced.   Even if the transmission power coefficient of the improved physical data channel is reduced, the transmission power coefficient of the dedicated physical channel and the improved physical channel is uniformly reduced when the total transmission power exceeds the maximum allowable power. The method of claim 1 further comprising: Said reducing step comprises:
Reducing the enhanced physical data channel supporting HARQ preferentially over the dedicated physical channel not supporting HARQ;
The method as claimed in claim 1, wherein the data channel for each of the enhanced physical channel and the dedicated physical channel is preferentially reduced over the control channel. Said reducing step comprises:
Obtaining a total transmit power predicted according to a transmit power control (TPC) command received from a base station in a particular slot;
Determining a first transmission power factor for the enhanced physical data channel that prevents the total transmission power from exceeding the maximum allowable power;
Providing the first transmission power coefficient as the reduced transmission power coefficient for the particular slot;
Using the measured total transmission power, the total transmission power value increased by a predetermined power control unit value and the power control unit value for at least one next slot following the specific slot An increased total transmission power value that is reduced by the maximum allowable power so that the increased total transmission power value and the decreased total transmission power value do not exceed the maximum allowable power, respectively. Respectively determining a second transmission power factor of the enhanced physical data channel corresponding to the reduced total transmission power value;
One of the second transmission power factors is received according to whether the TPC command is received in the at least one next slot and the received TPC command indicates an increase (UP) or a decrease (DOWN). A step of selecting one,
Providing the second transmission power factor selected in the at least one next slot as the reduced transmission power factor. The transmission power coefficient is
The method according to claim 1, characterized in that each is determined based on a transmission format (TF) selected according to the scheduling assignment information received from the base station. In a mobile communication system supporting an improved uplink service, a terminal device that transmits a dedicated physical channel that does not support complex automatic retransmission request (HARQ) and an improved physical channel that supports HARQ,
Determine transmission power coefficients for the dedicated physical channel and the enhanced physical channel, check whether the total transmission power required for transmission of the channel exceeds a maximum allowable power, and the total transmission power is A controller that reduces a transmit power factor for an improved physical data channel of the improved physical channels when the maximum allowable power is exceeded;
A channel generator for generating a data frame by performing channel coding and modulation of the dedicated physical channel and the enhanced physical channel;
And a gain adjuster for adjusting the transmission power coefficient of the reduced enhanced physical data channel and the dedicated physical channel and the transmission power coefficient of the enhanced physical data channel. The controller is
The gain adjuster is controlled to decrease a transmission power coefficient of the dedicated physical channel and the improved physical channel per slot when the total transmission power exceeds the maximum allowable power. 8. The apparatus according to 8. The gain adjuster is
If a dedicated physical data channel is set, the minimum value of the transmission power coefficient for the improved physical data channel is set to 0, and the improved physical data channel is not transmitted.
If the dedicated physical data channel is not set, the minimum value of the transmission power coefficient for the improved physical data channel is set to a preset β value, and the improved physical data channel is reduced and transmitted. 9. The apparatus according to claim 8, wherein: The controller is
Even if the transmission power coefficient of the improved physical data channel is reduced, if the total transmission power exceeds the maximum allowable power, the transmission power coefficient of the dedicated physical channel and the improved physical channel is uniformly reduced. 9. The apparatus according to claim 8, wherein the apparatus is controlled. The controller is
Controlling the enhanced physical data channel supporting HARQ to be preferentially reduced over the dedicated physical channel not supporting HARQ;
9. The apparatus of claim 8, wherein the control is performed such that the data channel for each of the improved physical data channel and the dedicated physical channel is preferentially reduced over the control channel. The controller is
In a particular slot, obtain the predicted total transmit power according to the transmit power control (TPC) command received from the base station,
Determining a first transmission power factor for the enhanced physical data channel that prevents the total transmission power from exceeding the maximum allowable power;
Providing the first transmission power factor for the particular slot to the enhanced physical data channel gain adjuster as the reduced transmission power factor;
Using the measured total transmission power, the total transmission power value increased by a predetermined power control unit value and the power control unit value for at least one next slot following the specific slot Find the total transmit power value reduced by
The increased total transmission power value and the decreased total transmission power value corresponding to the increased total transmission power value and the decreased total transmission power value, respectively, so that the maximum allowable power is not exceeded. Determining a second transmission power factor for each of the improved physical data channels;
One of the second transmission power factors is received according to whether the TPC command is received in the at least one next slot and the received TPC command indicates an increase (UP) or a decrease (DOWN). Select
9. The improved physical data channel gain adjuster of claim 8, wherein the second transmit power factor selected in the at least one next slot is provided as a reduced transmit power factor to the enhanced physical data channel gain adjuster. apparatus. The transmission power coefficient is
The apparatus according to claim 8, characterized in that each is determined based on a transmission format (TF) selected according to scheduling assignment information received from the base station.

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