CN101873687A - Power control method and device of high-speed physical downlink shared channel (HS-PDSCH) - Google Patents

Abstract

The invention discloses a power control method of a high-speed physical downlink shared channel (HS-PDSCH), which comprises the following steps of: converting a channel quality indicator (CQI) fed back by user equipment (UE) at the last time into a code rate; computing the difference value between the preset object code rate and the converted code rate; computing power adjustment quantity by utilizing the difference value; and adding the transmitting power of the HS-PDSCH corresponding to the CQI fed back by the UE at the last time with the power adjustment quantity to compute the current transmitting power of the HS-PDSCH. The invention also discloses a power control device of the HS-PDSCH. The invention can be used for realizing power control of the HS-PDSCH in VoIP (Voice over Internet Protocol) services.

Description

The Poewr control method of high-speed physical downlink shared channel (HS-PDSCH) and device

Technical field

The present invention relates to 3G (Third Generation) Moblie (3G, 3 ^RdGeneration Mobile Communications) field, the particularly Poewr control method and the device of high-speed physical downlink shared channel (HS-PDSCH) (HS-PDSCH, High Speed PhysicalDownlink Shared Channel).

Background technology

In 3GPP R5 agreement, in order to satisfy the demand of high-speed mobile data, services, propose a kind of high speed downlink packet and inserted (HSDPA, High Speed Downlink Packet Access) technology, the main target of HSDPA is the high speed support to Packet data service, it is very high that message transmission rate requires, and will obtain lower time delay, higher system throughput capacity and stronger service quality (QoS, Quality of Service) and guarantee.

HSDPA is descending to comprise two channels: High-Speed Shared Control Channel (HS-SCCH, High SpeedShared Control Channel) and high speed descending sharing channel (HS-DSCH, High SpeedDownlink Shared Channel).Wherein, HS-DSCH bearing downlink business datum, a plurality of subscriber equipment (UE, User Equipment) shares this channel by time division multiplexing and code division multiplexing, HS-DSCH can map to an above high-speed physical downlink shared channel (HS-PDSCH) (HS-PDSCH, High SpeedPhysical Downlink Shared Channel); HS-SCCH takies two descending spreading factor (SF, Spreading Factor) is 16 code channel, adopt four fixing absolute mutually phase-shift keying (QPSK, Quadrature Phase Shift Keying) modulation system, scheduling and the control information of carrying HS-DSCH, UE instructs separating of downlink data to be in harmonious proportion according to the decode results to HS-SCCH and deciphers.Adopt link adaptation techniques, the descending DPCH (DPCH, DedicatedPhysical Channel) that also is attended by of HSDPA.

HSDPA is up also to comprise a high-speed shared indication channel (H-SICH, High Speed SharedInformation Channel), take a up SF and be 16 code channel, adopt fixedly QPSK modulation system, be used for the channel quality indication (CQI that UE receives feeding back downlink link behind the HS-SCCH, Channel Quality Indicator) and to the transmission data reply affirmation (ACK, Acknowledgement) or non-affirmation (NACK, Non Acknowledgement) message.

HSPA+ is the HSDPA technology of upgrading, in order to make full use of resource, improve the number of users that inserts, removed dedicated channel DPCH, undertaken by the professional downlink transfer of the voice (VoIP, Voice ofInternet Protocol) of Internet protocol transmission by HSDPA.In the VoIP business, adopt the semi-continuous scheduling pattern usually, the base station at first begins the semi-continuous scheduling pattern by HS-SCCH notice UE, the base station no longer sends HS-SCCH then, and HS-PDSCH sends data according to pre-configured resource, and UE still feeds back CQI, ACK or NACK message.

At present, under the semi-continuous scheduling pattern, power control is not carried out to HS-PDSCH in the base station, only by Adaptive Modulation and Coding (AMC, Adaptive Modulation and Coding) variation that comes tracking environmental meets the requirements of QoS by the code check of adjusting HS-PDSCH.But when under the semi-continuous scheduling pattern, realizing that VoIP is professional, the resource and the data packets for transmission basic fixed of distributing for each user, it is the code check basic fixed of HS-PDSCH, in this case if meet the requirements of QoS, just need to utilize the power of HS-PDSCH is controlled the variation of following the tracks of channel circumstance, but also do not have Poewr control method in the prior art at HS-PDSCH.

Summary of the invention

First purpose of the present invention is to provide the Poewr control method of a kind of HS-PDSCH, uses this method can realize the power of HS-PDSCH is controlled in the VoIP business.

Second purpose of the present invention is to provide the output control device of a kind of HS-PDSCH, uses this device can realize the power of HS-PDSCH is controlled in the VoIP business.

Technical scheme of the present invention is achieved in that

A kind of Poewr control method of high-speed physical downlink shared channel (HS-PDSCH), the Initial Trans of default high-speed physical downlink shared channel (HS-PDSCH) HS-PDSCH; Key is, the target bit rate of default HS-PDSCH; This method comprises:

Use the channel quality indicator (CQI) of the last feedback of user equipment (UE) to convert out code check;

The difference of the code check that calculates described target bit rate and convert out;

Utilize described difference rated output adjustment amount;

Use the transmitting power of the pairing HS-PDSCH of CQI of the last feedback of UE to add the above power adjustment, calculate the transmitting power of current HS-PDSCH.

A kind of output control device of high-speed physical downlink shared channel (HS-PDSCH) sets in advance the Initial Trans of the linear shared channel HS-PDSCH of high-speed physical; Key is that this device comprises:

Code check conversion module is used to use the CQI of the last feedback of UE to convert out code check; The difference of the target bit rate of the HS-PDSCH that calculating sets in advance and the code check of converting out;

Power control module is used to the difference rated output adjustment amount that utilizes code check conversion module to draw; Use the transmitting power of the pairing HS-PDSCH of CQI of the last feedback of UE to add the above power adjustment, calculate the transmitting power of current HS-PDSCH.

As seen the Poewr control method of the HS-PDSCH among the present invention, the code check that the CQI that utilizes UE to feed back converts out and the difference of goal-selling code check, the rated output adjustment amount, transmitting power at the last pairing HS-PDSCH of CQI that feeds back of UE adds the above power adjustment again, calculates the transmitting power of current HS-PDSCH.Because CQI is the reflection of channel circumstance quality, therefore the code check that utilizes CQI to convert out carries out power control, can follow the tracks of the variation of channel circumstance, therefore make the VoIP business under the situation of resource of distributing for each user and data packets for transmission basic fixed, realized power control, thereby met the requirements of the transmission quality of QoS, assurance VoIP business HS-PDSCH.

Description of drawings

Fig. 1 is the flow chart of the Poewr control method of HS-PDSCH of the present invention;

Fig. 2 is the structural representation of the output control device of HS-PDSCH of the present invention.

Embodiment

For making objects and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with drawings and Examples.

Fig. 1 before this flow process begins, sets in advance Initial Trans and the target bit rate of HS-PDSCH for the flow chart of the Poewr control method of HS-PDSCH of the present invention;

Flow process shown in Figure 1 comprises:

Step 101: use the CQI of the last feedback of UE to convert out code check.

Step 102: the difference of calculating target bit rate that sets in advance and the code check of converting out.

Step 103: utilize described difference rated output adjustment amount.

Step 104: use the transmitting power of the pairing HS-PDSCH of CQI of the last feedback of UE to add the above power adjustment, calculate the transmitting power of current HS-PDSCH.

As seen the Poewr control method of the HS-PDSCH among the present invention, the code check that the CQI that utilizes UE to feed back converts out and the difference of goal-selling code check, the rated output adjustment amount, transmitting power at the last pairing HS-PDSCH of CQI that feeds back of UE adds the above power adjustment again, calculates the transmitting power of current HS-PDSCH.Because CQI is the reflection of channel circumstance quality, therefore the code check that utilizes CQI to convert out carries out power control, can follow the tracks of the variation of channel circumstance, therefore make the VoIP business under the situation of resource of distributing for each user and data packets for transmission basic fixed, realized power control to HS-PDSCH, thereby meet the requirements of QoS, guaranteed the transmission quality of VoIP.

In following examples, the present frame of supposing the data that send on the HS-PDSCH is the n frame; The physical resource that distributes for HS-PDSCH is that N spreading factor is 16 code channel, and under the situation that modulation system is fixed, the value of N also immobilizes; The current transmit power of HS-PDSCH is

, wherein the current transmit power of certain code channel is

The descending time slot maximum power of base station baseband restriction is P _Max, this value can obtain by the method for emulation, test or other prior aries.

According to the method for prior art, the initial power of HS-PDSCH distributes according to following formula 1.

Formula 1: $P_{S\_\mathrm{code}}^n=P_{\max }/16;$ $P_S^n=(P_{\max }/16)\×N.$

Based on the configuration of initial power, suppose that HS-PDSCH goes up the data block transmitted size and is TBS, then according to the method for prior art, need the desired value of the code check that transmits to determine on the HS-PDSCH according to following formula 2.

Formula 2: ${\mathrm{\λ}}_{t\arg \mathrm{et}}=\frac{\mathrm{TBS}}{44\×\mathrm{Modbit}\×N}.$

Wherein, if modulation system is QPSK, then the correction value Modbit in the formula is 2 bits, if modulation system is the quadrature amplitude modulation (16QAM of 16 systems, 16 Quadrature AmplitudeModulation), then the correction value Modbit in the formula is 4 bits.

The Poewr control method of HS-PDSCH provided by the invention comprises following two kinds of concrete execution modes.

First kind of execution mode is converted to code check λ according to the method for prior art with the CQI of HS-SICH feedback _n, again with λ _nWith λ _TargetRelatively, produce the TPC command word according to comparative result.

Comprise among the CQI that HS-PDSCH goes up data block TBS index and the modulation system that sends, therefore the method according to prior art can be converted to code check with CQI.

The TPC command word produces according to following formula 3.

Formula 3: $\mathrm{TPC}\left(n\right)=\left\{\begin{array}{cc}{}^{\&prime;\&prime;}\mathrm{UP}^{\&prime;\&prime;},& {\mathrm{\&lambda;}}_{t\arg \mathrm{et}}-{\mathrm{\&lambda;}}_n\&GreaterEqual;0\\ {}^{\&prime;\&prime;}\mathrm{Down}^{\&prime;\&prime;},& {\mathrm{\&lambda;}}_{\mathrm{terget}}-{\mathrm{\&lambda;}}_n<0\end{array}\right..$

Wherein, " UP " indication increases the power control value of HS-PDSCH, represents addition in follow-up computing formula, and " Down " indication reduces the power control value of HS-PDSCH, represents in follow-up computing formula and subtracts each other.

Base station record is made as N from the time of the pairing HS-PDSCH of CQI of the last UE feedback and the interval of current time _Gap, the frame number of establishing the pairing HS-PDSCH of CQI of the last UE feedback is n ', then N _Gap=n-n '; If T _GapBe time interval threshold value, this value can obtain by the method for emulation, test or other prior aries; If adjusting step-length with reference to the power control of HS-SCCH is P _{Step_HS-SCCH}, can be configured to 1,2 or 3dB according to actual needs.

At the interval of the time of the pairing HS-PDSCH of CQI of the last UE feedback and current time during less than predetermined threshold value, the transmitting power of the pairing HS-PDSCH of CQI of the transmitting power of current HS-PDSCH and the last UE feedback has big relevance, and the transmitting power of current HS-PDSCH is determined in the base station according to following formula 4.

Formula 4: $P_S^n=P_S^{n-N_{\mathrm{gap}}}+\underset{i=n-N_{\mathrm{gap}}+1}{\overset{n}{\mathrm{\&Sigma;}}}\mathrm{TPC}\left(i\right)\&times;P_{\mathrm{step}\_\mathrm{HS}-\mathrm{SCCH}},$ N _gap＜T _gap。

At the interval of the time of the pairing HS-PDSCH of CQI of the last UE feedback and current time during more than or equal to predetermined threshold value, illustrate what relevance the transmitting power of current HS-PDSCH and the transmitting power of the pairing HS-PDSCH of CQI that the last UE feeds back do not have, do not adopt formula 4 to determine the transmitting power of current HS-PDSCH, and can keep the transmitting power of the pairing HS-PDSCH of CQI of the last UE feedback constant, perhaps adopt the initial power of configuration again.These two kinds are chosen in and there is no too big-difference on the effect, and just when adopting the initial power of configuration, it is bigger that the transmitting power of HS-PDSCH is jumped, and channel disturbance can be strong.

Second kind of execution mode is converted to code check λ according to the method for prior art with the CQI of HS-SICH feedback _n, again with λ _nWith λ _TargetRelatively, produce power adjustment according to comparative result.

With λ _nWith λ _TargetDifference range relatively is quantified as the N section, obtains the adjusted value of each section correspondence by the relevant mode of emulation, test or other prior aries.Determine λ _nWith λ _TargetAfter in the difference range relatively each quantizes the pairing adjusted value of section, obtain comprising the quantization table that quantizes section and corresponding adjusted value corresponding relation.

Base station record is made as N from the time of the pairing HS-PDSCH of CQI of the last UE feedback and the interval of current time _Gap, the subframe numbers of establishing the pairing HS-PDSCH of CQI of the last UE feedback is n ', then N _Gap=n-n '; If T _GapBe time interval threshold value, this value can obtain by the method for emulation, test or other prior aries.

Calculate Δ λ=λ _Target-λ _n,, be assumed to be Δ P by looking into the power adjustment that quantization table obtains Δ λ correspondence _n(x), wherein x represents the affiliated x section of Δ λ.

At the interval of the time of the pairing HS-PDSCH of CQI of the last UE feedback and current time during less than predetermined threshold value, the transmitting power of the pairing HS-PDSCH of CQI of the transmitting power of current HS-PDSCH and the last UE feedback has big relevance, and the transmitting power of current HS-PDSCH is determined in the base station according to following formula 5.

Formula 5: $P_S^n=\left\{\begin{array}{cc}{P}_S^{n-N_{\mathrm{gap}}}+\underset{i=n-N_{\mathrm{gap}}+1}{\overset{n}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{P}_i\left(x\right),& \mathrm{\&Delta;\&lambda;}\&GreaterEqual;0\\ P_S^{n-N_{\mathrm{gap}}}-\underset{i=n-N_{\mathrm{gap}}+1}{\overset{n}{\mathrm{\&Sigma;}}}\mathrm{\&Delta;}{P}_i\left(x\right),& \mathrm{\&Delta;\&lambda;}<0\end{array}\right..$

At the interval of the time of the pairing HS-PDSCH of CQI of the last UE feedback and current time during more than or equal to predetermined threshold value, illustrate what relevance the transmitting power of current HS-PDSCH and the transmitting power of the pairing HS-PDSCH of CQI that the last UE feeds back do not have, the base station can keep the transmitting power of the pairing HS-PDSCH of CQI of the last UE feedback constant, perhaps adopts the initial power of configuration again.These two kinds are chosen in and there is no too big-difference on the effect, and just when selecting to adopt the initial power of configuration, it is bigger that the transmitting power of HS-PDSCH is jumped, and channel disturbance can be strong.

Because may there be error in the CQI of UE feedback sometimes, therefore determine the transmitting power of HS-PDSCH more accurately for further assurance, no matter be to adopt above-mentioned first kind of execution mode or second kind of execution mode to determine the transmitting power of current HS-PDSCH, the base station can be before the code check of the last CQI that feeds back of conversion UE, utilize the ACK or the NACK message of UE feedback before the current time that CQI is revised earlier, within the limits prescribed with the QoS of the code check correspondence that guarantees to use the CQI conversion.Above-mentioned correction belongs to the method for prior art, repeats no more here.

In the VoIP business, corresponding to the variation of channel circumstance, in order better to improve the utilization ratio of power and code channel resource, the base station can also adaptive adjustment channel modulation mode.Provide with reference to the transmitting power of HS-PDSCH at this and to carry out method that channel modulation mode adjusts for example.

If the modulation system of current HS-PDSCH is QPSK, the mean value of transmitting power in a period of time of supposing the HS-PDSCH that determines according to method provided by the invention is lower than the threshold value that sets in advance, think that then channel circumstance during this period of time is relatively good, the base station can change the modulation system of HS-PDSCH into 16QAM.On the contrary, if the modulation system of current HS-PDSCH is 16QAM, the mean value of transmitting power in a period of time of supposing the HS-PDSCH that determines according to method provided by the invention is higher than the threshold value that sets in advance, think that then channel circumstance during this period of time is poor, the base station can change the modulation system of HS-PDSCH into QPSK.Above-mentioned threshold value can obtain by the correlation technique of emulation, test or other prior aries.

Adjust the modulation system of HS-PDSCH in the base station after, the transmitting power that modulation system changes first HS-PDSCH of back need reinitialize, and the present invention provides following two kinds of methods that reinitialize:

The first, obtain according to formula 1;

When the second, supposing the code check variation of HS-PDSCH, the transmitting power in corresponding solid size road can change in same ratio, then concerns the initial power of 6 calculating HS-PDSCH according to the following equation according to this;

Formula 6: $P_S^n=P_S^m+10\log \left(\frac{N_n\&times;{\mathrm{\&lambda;}}_{t\arg \mathrm{et},n}}{N_m\&times;{\mathrm{\&lambda;}}_{t\arg \mathrm{et},m}}\right)+\mathrm{\&delta;}.$

Wherein, n is that modulation system changes the frame number that first HS-PDSCH of back sends, and m is the frame number that last HS-PDSCH sent before modulation system changed, N _nFor modulation system changes the code channel number that back HS-PDSCH disposes, N _mChange the code channel number of preceding HS-PDSCH configuration for modulation system; δ is the surplus when adjusting transmitting power according to the code check ratio, replenishes the difference power that causes owing to error, and δ can obtain by the relevant mode of emulation, test or other prior aries.

Calculate first HS-PDSCH transmitting power of modulation system change back according to above-mentioned formula 6 after, this value can once be adjusted to the transmitting power of HS-PDSCH in the base station, also can be divided into several steps, each Transmission Time Interval (TTI) is adjusted a step-length, adjust to gradually on this value, the purpose of doing like this is in order to reduce the paroxysmal interference to the adjacent area user, concrete several steps of branch are adjusted and can determine according to actual conditions, but preferably total adjustment time is less than the adjustment cycle of current modulation mode.

After modulation system changed, the target bit rate of HS-PDSCH also needed to reset, and got final product according to formula 2, and wherein Modbit in the formula 2 and N get the pairing value of modulation system after the change.

For realizing method provided by the invention, the present invention also provides the output control device of a kind of HS-PDSCH, and Fig. 2 is the structural representation of the output control device of HS-PDSCH of the present invention, and this device comprises: code check conversion module and power control module.Wherein,

Code check conversion module is used to use the CQI of the last feedback of UE to convert out code check; The difference of the target bit rate of the HS-PDSCH that calculating sets in advance and the code check of converting out.

Power control module is used to the difference rated output adjustment amount that utilizes code check conversion module to draw; Use the transmitting power of the pairing HS-PDSCH of CQI of the last feedback of UE to add the above power adjustment, calculate the transmitting power of current HS-PDSCH.

Whether relevant property is made judgement in order to be implemented in before the conversion code check earlier transmitting power to current HS-PDSCH and the last pairing HS-PDSCH of CQI that feeds back of UE, further comprise in this device: trigger module, be used to calculate the time of the last pairing HS-PDSCH of CQI that feeds back of UE and the time interval of current time, when time interval that calculates during, trigger described code check conversion module and begin operation less than predetermined threshold value; When calculate when equaling described threshold value, trigger power control module with the transmitting power of the pairing HS-PDSCH of CQI of the last feedback of UE transmitting power, perhaps with the transmitting power of default initial power as current HS-PDSCH as current HS-PDSCH.

For realizing carrying out the adjustment of modulation system based on the transmitting power of HS-PDSCH, this device further comprises: the modulation system control module, be used to calculate the mean value of the transmitting power of HS-PDSCH in the setting-up time, if it is QPSK that this mean value is lower than the modulation system of predetermined threshold value and current HS-PDSCH, then modulation system is changed to 16QAM; If it is 16QAM that this mean value is higher than the modulation system of described thresholding and current HS-PDSCH, then modulation system is changed to QPSK.

In this case, power control module is further used for, change the modulation system of HS-PDSCH in described modulation system control module after, the Initial Trans that modulation system changes first HS-PDSCH of back is set, and resets the target bit rate of HS-PDSCH.

The invention described above device is positioned at base station side, can be positioned at inside of base station, also can be arranged in the other system that links to each other with the base station.Each module in this device is all carried out according to step corresponding in the method provided by the invention when carrying out concrete function, repeats no more here.

In sum, more than be the preferred embodiment of present embodiment only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (15)

1. the Poewr control method of a high-speed physical downlink shared channel (HS-PDSCH), the Initial Trans of default high-speed physical downlink shared channel (HS-PDSCH) HS-PDSCH; It is characterized in that the target bit rate of default HS-PDSCH; This method comprises:

Use the channel quality indicator (CQI) of the last feedback of user equipment (UE) to convert out code check;

The difference of the code check that calculates described target bit rate and convert out;

Utilize described difference rated output adjustment amount;

Use the transmitting power of the pairing HS-PDSCH of CQI of the last feedback of UE to add the above power adjustment, calculate the transmitting power of current HS-PDSCH.

2. the method for claim 1 is characterized in that, the time of the pairing HS-PDSCH of CQI of the last feedback of default UE and the time interval threshold value of current time;

Use the CQI of the last feedback of UE to convert out before the code check, further comprise:

Calculate the time of the last pairing HS-PDSCH of CQI that feeds back of UE and the time interval of current time;

When time interval that calculates during, continue to carry out the step that the CQI that uses the last feedback of UE converts out code check less than described threshold value; When calculate when equaling described threshold value, with the transmitting power of the pairing HS-PDSCH of CQI of the last feedback of UE transmitting power, perhaps with the transmitting power of described initial power as current HS-PDSCH as current HS-PDSCH.

3. method as claimed in claim 2 is characterized in that, described continuation is carried out and used the CQI of the last feedback of UE to convert out before the step of code check, further comprises:

The affirmation ACK or the non-affirmation NACK message of UE feedback before the use current time are revised the last CQI that feeds back of described UE.

4. as claim 2 or 3 described methods, it is characterized in that the frame number of establishing current HS-PDSCH transmission is n; The frame number that the pairing HS-PDSCH of CQI of the last feedback of UE sends is n ';

The time of the pairing HS-PDSCH of CQI of the last feedback of described calculating UE and the time interval N of current time _GapThe time, according to following formula: N _Gap=n-n '.

5. method as claimed in claim 4 is characterized in that, establishing and adjusting step-length with reference to the power control of high-speed shared control channel HS-SCCH is P _{Step_HS-SCCH}The transmitting power of the pairing HS-PDSCH of CQI of the last feedback of UE is

, the transmitting power of current HS-PDSCH is

Described target bit rate is λ _Target, the described code check of converting out is λ _n

Utilize described difference rated output adjustment amount to comprise:

Produce the TPC command word according to following formula:

Wherein UP represent positive 1, DOWN representative negative 1;

During the rated output adjustment amount, according to following formula:

During the transmitting power of the current HS-PDSCH of described calculating, according to following formula:

$P_S^n=P_S^{n-N_{\mathrm{gap}}}+\underset{i=n-N_{\mathrm{gap}}+1}{\overset{n}{\mathrm{\&Sigma;}}}\mathrm{TPC}\left(i\right)\&times;P_{\mathrm{step}\_\mathrm{HS}-\mathrm{SCCH}}.$

6. method as claimed in claim 4 is characterized in that, the transmitting power of establishing the pairing HS-PDSCH of CQI of the last feedback of UE is

, the transmitting power of current HS-PDSCH is

Set in advance the scope of described difference, and this scope is quantified as the N section, the wherein adjusted value Δ P of each section correspondence is set _i(x); Described target bit rate is λ _Target, the described code check of converting out is λ _n

During the transmitting power of the current HS-PDSCH of described calculating, according to following formula:

Wherein

Be described power adjustment.

7. the method for claim 1 is characterized in that, the thresholding of the transmitting power mean value of default HS-PDSCH;

After the transmitting power of the current HS-PDSCH of described calculating, further comprise:

Calculate the mean value of the transmitting power of HS-PDSCH in the setting-up time, if this mean value is lower than the thresholding of described transmitting power mean value and the modulation system of current HS-PDSCH is four absolute mutually phase-shift keying QPSK, then modulation system is changed to the quadrature amplitude modulation 16QAM of 16 systems; If this mean value is higher than the thresholding of described transmitting power mean value and the modulation system of current HS-PDSCH is 16QAM, then modulation system is changed to QPSK.

8. method as claimed in claim 7 is characterized in that, described modulation system is changed to 16QAM, or modulation system is changed to after the QPSK, further comprises:

The Initial Trans that modulation system changes first HS-PDSCH of back is set, and resets the target bit rate of HS-PDSCH.

9. method as claimed in claim 8 is characterized in that, establishes HS-PDSCH and takies N the code channel that spreading factor is SF, and the descending time slot maximum power of base band restriction is P _MaxIf it is n that modulation system changes the frame number of first HS-PDSCH transmission of back, the transmitting power of this HS-PDSCH is

Described when modulation system being set changing the Initial Trans of first HS-PDSCH of back, carry out according to following formula:

$P_S^n=(P_{\max }/\mathrm{SF})\&times;N.$

10. method as claimed in claim 8 is characterized in that, the frame number of establishing first HS-PDSCH transmission of modulation system change back is n, and the transmitting power of this HS-PDSCH is

, default target bit rate is λ _{Target, n}The frame number that last HS-PDSCH sent before modulation system changed is m, and the transmitting power of this HS-PDSCH is

, the target bit rate of resetting is λ _{Target, m}The adjustment surplus is δ;

The described Initial Trans that modulation system change first HS-PDSCH of back is set, carry out according to following formula:

$P_S^n=P_S^m+10\log \left(\frac{N_n\&times;{\mathrm{\&lambda;}}_{t\arg \mathrm{et},n}}{N_m\&times;{\mathrm{\&lambda;}}_{t\arg \mathrm{et},m}}\right)+\mathrm{\&delta;}.$

11. method as claimed in claim 10 is characterized in that, establish modulation system change before the code channel number that takies of HS-PDSCH be N _n, the code channel number that HS-PDSCH took after modulation system changed is N _m

During described goal-selling code check, according to following formula:

Described when resetting target bit rate, according to following formula:

Wherein,

Described TBS is the data block size that HS-PDSCH sends, and Modbit is for revising value.

12. the output control device of a high-speed physical downlink shared channel (HS-PDSCH) sets in advance the Initial Trans of the linear shared channel HS-PDSCH of high-speed physical; It is characterized in that this device comprises:

Code check conversion module is used to use the CQI of the last feedback of UE to convert out code check; The difference of the target bit rate of the HS-PDSCH that calculating sets in advance and the code check of converting out;

Power control module is used to the difference rated output adjustment amount that utilizes code check conversion module to draw; Use the transmitting power of the pairing HS-PDSCH of CQI of the last feedback of UE to add the above power adjustment, calculate the transmitting power of current HS-PDSCH.

13. device as claimed in claim 12, it is characterized in that, this device further comprises: trigger module, be used to calculate the time of the last pairing HS-PDSCH of CQI that feeds back of UE and the time interval of current time, when the time interval that calculates less than default time interval during thresholding, trigger described code check conversion module and begin operation; When calculate interval greater than equaling described default time interval during thresholding, trigger power control module with the transmitting power of the pairing HS-PDSCH of CQI of the last feedback of UE transmitting power, perhaps with the transmitting power of default initial power as current HS-PDSCH as current HS-PDSCH.

14. device as claimed in claim 12, it is characterized in that, further comprise in this device: the modulation system control module, be used to calculate the mean value of the transmitting power of HS-PDSCH in the setting-up time, if it is four absolute mutually phase-shift keying QPSK that this mean value is lower than the modulation system of default transmitting power mean value threshold and current HS-PDSCH, then modulation system is changed to the quadrature amplitude modulation 16QAM of 16 systems; If it is 16QAM that this mean value is higher than the modulation system of default transmitting power mean value threshold and current HS-PDSCH, then modulation system is changed to QPSK.

15. device as claimed in claim 14, it is characterized in that, described power control module is further used for, change the modulation system of HS-PDSCH in described modulation system control module after, the Initial Trans that modulation system changes first HS-PDSCH of back is set, and resets the target bit rate of HS-PDSCH.

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