CN102387575B - The control method of a kind of power and system - Google Patents

Abstract

The invention discloses a power control method, which includes: counting the related information of the downlink shared channel; comparing the related information of the downlink shared channel with a preset threshold value to obtain a comparison result; adjusting the The transmission power of the downlink shared channel; the present invention also provides a power control system. According to the technical solution of the present invention, the transmission power of the downlink shared channel can be adjusted.

Description

A power control method and system

technical field

The present invention relates to power control technology, in particular to a power control method and system.

Background technique

High Speed Downlink Package Access (HSDPA, High Speed Downlink Package Access) technology is also applicable to Wideband Code Division Multiple Access (WCDMA, Wide band Code Division Multiple Access) communication system and Time Division Synchronous Code Division Multiple Access (TD-SCDMA, Time Division Synchronous Code Division Multiple Access) communication system. In the HSDPA technology, a High Speed Physical Downlink Shared Channel (HS-PDSCH, High Speed Physical Downlink Shared Channel) is used for data transmission, and multiple user equipments (UE, User Equipment) share the channel through time division multiplexing and code division multiplexing. In order to realize fast adaptive modulation and coding (AMC, Adaptive Modulation and Coding) control of HS-PDSCH, the shared control channel (HS-SCCH, High Speed Shared Control Channel Channel) of HS-PDSCH needs to be used as its downlink control channel to carry HS -The control information of PDSCH is used as its uplink control channel through HS-SICH (High Speed Shared InformationChannel), which is used to feed back downlink channel quality indicator (CQI, Channel Quality Indicator) information and CQI information to the base station Including the transport block size (TBS, Transport BlockSize), the recommended modulation format (RMF, Recommended Modulation Format), and the acknowledgment character (ACK, ACKnowledge Character) or non-acknowledgment character (NACK, NotACKnowledge Character) of the transport block, etc.

The key technology of HSDPA technology is to give up fast power control of the shared channel, and adopt AMC to adapt to the change of the wireless channel. When the channel environment of the UE is good, the network side adopts a higher transmission block size under certain resource conditions in order to obtain a higher peak rate; when the channel environment deteriorates, the network side adopts a lower transmission block size to facilitate Get higher transmission reliability. However, for HS-PDSCH, power control is generally not used. However, in some cases, the channel environment of the UE is very good. SNR required by the highest coding rate or the largest transmission block), at this time, if the transmission power of HS-PDSCH can be reduced through power control, the interference within and between cells can be reduced, the throughput of the cell can be improved, and the unnecessary waste of power. In some special cases, when the transmission power of the HS-PDSCH is too high, the power exceeds the dynamic range of the receiver when the UE receives it, which will cause the UE receiver to be saturated, so the higher power cannot bring about an effective signal-to-noise ratio. promote. At this time, reducing the transmission power can reduce interference to neighboring cells and waste of power without loss of performance. For a UE with a bad channel environment, in order to achieve a higher transmission rate, it is necessary to increase the transmission power of the HS-PDSCH. Therefore, it is very necessary to control the transmission power of the HS-PDSCH.

In the prior art, the control of the transmission power of the HS-PDSCH belonging to the downlink shared channel mainly adopts the following two processing methods. One processing method is that when the UE finds that the received Signal to Interference Ratio (SIR, Signal to Interference Ratio) of the downlink HS-PDSCH reaches or exceeds the highest coding rate or the largest transport block, it actively reports the indication of the transmission power adjustment to the base station NodeB. This processing method needs to add relevant indications of transmission power adjustment in the feedback of the uplink control channel, such as Frequency Division Duplex (FDD, Frequency Division Duplex) in the 3rd Generation Partnership Project (3GPP, the ^3rd Generation Partnership Project) In the standard, an invalid CQI index is used as an indication of transmission power adjustment, for example, when CQI=30, it means that the transmission power is lowered by 1dB; but for 3GPP Time Division Duplex (TDD, Time Division Duplex), since there is no invalid CQI, so In order to increase the indication of transmission power adjustment, it is necessary to modify the physical layer HS-SICH frame structure, so that it cannot be compatible with terminals that only support the original frame structure, so there are great limitations in application; even for FDD, due to invalid CQI The index is limited, and the transmission power can only be adjusted down by 2dB at most, which greatly limits the application of this technology.

Another processing method is to rely on the CQI information fed back by the UE on the HS-SICH, that is, when the UE continuously receives multiple transport blocks whose TBS is higher than a certain threshold, it can lower the transmission power; or continuously receives multiple TBS When the transmission block is lower than a certain threshold, the transmit power can be adjusted up. Although this processing method can adjust the transmission power of the HS-PDSCH up and down, it has inherent limitations. For example, the basis for lowering the transmit power is that the TBS in the CQI information fed back on N consecutive HS-SICHs has reached the recommended maximum transmission block. However, according to this CQI information, the system cannot distinguish the real Whether the SIR is much higher than the quality required by the largest transmission block or just equal to the quality required by the largest transmission block, so that the adjustment of the transmission power cannot be really effectively implemented, and according to this algorithm, the user cannot always reach the maximum peak rate; In addition, for some UEs, due to the problem of terminal design, it may be difficult to achieve the maximum rate. At this time, even if the transmission power is reduced, the rate will not be greatly affected. Even if the above method is used, the goal cannot be achieved.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a power control method and system capable of adjusting the transmission power of the downlink shared channel.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

The present invention provides a power control method, including:

Statistical information about the downlink shared channel;

Comparing the relevant information of the downlink shared channel with a preset threshold value to obtain a comparison result;

According to the comparison result, the transmission power of the downlink shared channel is adjusted.

In the above method, the relevant information of the statistical downlink shared channel is:

Statistical information about the downlink shared channel, the related information includes: the probability that the transport block size (TBS) information selected for the user equipment (UE) on the downlink shared channel is greater than the target TBS information, and the confirmation carried on the uplink feedback channel of the downlink shared channel The probability of a character (ACK) and/or the probability of a non-acknowledgement character (NACK).

In the above method, the comparison of the relevant information of the downlink shared channel with the preset threshold value is as follows:

The TBS information includes TBS and one of the code rates corresponding to the TBS;

When the downlink period of the transmit power is reached, the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value is compared with the preset code rate probability threshold value, and the The probability of the ACK carried on the uplink feedback channel of the downlink shared channel is compared with the preset ACK probability threshold.

In the above method, the comparison of the relevant information of the downlink shared channel with the preset threshold value is as follows:

The TBS information includes TBS and one of the code rates corresponding to the TBS;

When the up-regulation period of the transmit power is reached, the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value is compared with the preset code rate probability threshold value, or the downlink The probability of NACK carried on the uplink feedback channel of the shared channel is compared with the preset probability threshold of NACK.

In the above method, according to the comparison result, adjusting the transmit power of the downlink shared channel is:

The probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate is greater than the probability threshold value of the preset code rate, and the probability of the ACK carried on the uplink feedback channel of the downlink shared channel is greater than The preset ACK probability threshold value adjusts the transmission power of the downlink shared channel downward by one power step.

In the above method, according to the comparison result, adjusting the transmit power of the downlink shared channel is:

The probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value, less than the probability threshold value of the preset code rate, or the probability of NACK carried on the uplink feedback channel of the downlink shared channel , is greater than the preset NACK probability threshold, and the transmit power of the downlink shared channel is adjusted upward by one power step.

The present invention also provides a power control system, including: a statistics module, a comparison module, and an adjustment module; wherein,

A statistical module, configured to count relevant information of the downlink shared channel;

A comparison module, configured to compare the relevant information of the downlink shared channel with a preset threshold value to obtain a comparison result;

An adjustment module, configured to adjust the transmit power of the downlink shared channel according to the comparison result.

In the above system, the relevant information of the downlink shared channel includes:

The probability that the TBS information selected for the UE on the downlink shared channel is greater than the target TBS information, the probability of ACK and/or the probability of NACK carried on the uplink feedback channel of the downlink shared channel.

In the above system, the comparison module compares the relevant information of the downlink shared channel with a preset threshold value, and the comparison result is:

When the downlink period of the transmit power is reached, the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value is compared with the preset code rate probability threshold value, and the The probability of the ACK carried on the uplink feedback channel of the downlink shared channel is compared with the preset ACK probability threshold;

Or, when the up-regulation period of the transmit power is reached, the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value is compared with the preset probability threshold value of the code rate, or The probability of NACK carried on the uplink feedback channel of the downlink shared channel is compared with a preset NACK probability threshold.

In the above system, the adjustment module adjusts the transmit power of the downlink shared channel according to the comparison result as:

The probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate is greater than the probability threshold value of the preset code rate, and the probability of the ACK carried on the uplink feedback channel of the downlink shared channel is greater than The preset probability threshold value of ACK, the adjustment module adjusts the transmission power of the downlink shared channel downward by one power step;

The probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value, less than the probability threshold value of the preset code rate, or the probability of NACK carried on the uplink feedback channel of the downlink shared channel , greater than the preset NACK probability threshold, the adjustment module adjusts the transmit power of the downlink shared channel upward by one power step.

The power control method and system provided by the present invention can determine the transmission power adjustment method of the downlink shared channel according to the comparison result between the relevant information of the downlink shared channel and the threshold value, and can adjust the transmission power of the downlink shared channel. Dynamically and periodically count the related information of the downlink shared channel, that is, the probability that the TBS information selected for the UE on the downlink shared channel is greater than the target TBS information, the probability of ACK and/or the probability of NACK carried on the uplink feedback channel of the downlink shared channel , based on the relevant information to determine the adjustment mode of the transmission power, so that the basis for processing the up-regulation and down-regulation of the transmission power of the downlink shared channel is very simple. In addition, by appropriately reducing the transmit power of the downlink shared channel that is closer to the base station and has a better channel environment, limited power resources can be allocated to the cell that can improve throughput the most, thereby improving the utilization rate of the transmit power of the base station and improving the overall communication efficiency. The power resource utilization of the system improves the throughput performance and coverage performance of the entire communication system.

Description of drawings

Fig. 1 is a schematic flow chart of the control method for realizing power in the present invention;

Fig. 2 is a schematic structural diagram of the control system for realizing power in the present invention.

detailed description

The basic idea of the present invention is: to count the related information of the downlink shared channel; compare the related information of the downlink shared channel with the preset threshold value to obtain the comparison result; adjust the transmission of the downlink shared channel according to the comparison result power.

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

The present invention provides a power control method. Fig. 1 is a schematic flow chart of the present invention to realize the power control method. As shown in Fig. 1, the method includes the following steps:

Step 101, making statistics on the relevant information of the downlink shared channel;

Specifically, the statistics module of the base station counts the relevant information of the downlink shared channel, the relevant information includes: the probability that the TBS information selected for the UE on the downlink shared channel is greater than the target TBS information, and the probability of the ACK carried on the uplink feedback channel of the downlink shared channel and/or the probability of NACK; wherein, the TBS information can be TBS, or the code rate corresponding to TBS, and the code rate corresponding to TBS and TBS are two completely equivalent parameters; the statistical module will count the obtained downlink sharing The relevant information of the channel is sent to the comparison module of the base station.

The method of counting the probability that the TBS information selected for the UE on the downlink shared channel is greater than the target TBS information value is: taking the TBS information as the code rate corresponding to the TBS as an example, within the measurement period, when the statistics module determines that the UE sends a TBS, it will Update the counter, that is, Cont_N=Cont_N+1, where Cont_N is the total number of TBS issued by the UE; use the formula CR=TBS/NSize to calculate the code rate corresponding to TBS, where CR is the code rate corresponding to TBS, and TBS is the transmission The size of the block, Nsize is the maximum number of bits that can be carried by the HS-PDSCH resource allocated to the UE; compare the calculated code rate CR corresponding to the TBS with the preset target code rate value, if the code rate CR is greater than the target code rate Rate value, update the counter, that is, Cont_M=Cont_M+1; when the measurement period ends, according to the formula Obtain the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value;

The method of counting the probability of ACK and NACK carried on the uplink feedback channel of the downlink shared channel is: within the measurement period, when the statistical module determines that the ACK and/or NACK fed back by the UE on the HS-SICH is received, the counter is updated, That is, Cont_B=Cont_B+1, Cont_B is the total number of ACKs and/or NACKs received by the UE on the HS-SICH; if ACK is received, the ACK counter is updated at the same time, that is, Cont_ACK=Cont_ACK+1, Cont_ACK is received The number of ACKs fed back by UE on HS-SICH. If NACK is received, update the NACK counter at the same time, that is, Cont_NACK=Cont_NACK+1, Cont_NACK is the number of NACKs received by UE on HS-SICH; when the measurement period ends , according to the formula and / or respectively obtaining the probability of ACK and/or the probability of NACK carried on the uplink feedback channel of the downlink shared channel;

The measurement period is preset in the statistics module, and the size of the measurement period can be determined according to the number of samples required by the statistics module.

Step 102, comparing the statistically obtained related information of the downlink shared channel with a preset threshold value to obtain a comparison result;

Specifically, the comparison module of the base station receives the related information of the downlink shared channel sent by the statistical module, and compares the related information of the downlink shared channel with a preset threshold value;

Taking the TBS information as the code rate corresponding to the TBS as an example, when the downlink period of the transmit power is reached, the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value is compared with the preset target code rate value. The probability threshold value of the code rate is compared, and the probability of the ACK carried on the uplink feedback channel of the downlink shared channel is compared with the preset probability threshold value of the ACK; or, when the increase period of the transmission power is reached, The probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value is compared with the probability threshold value of the preset code rate, or the uplink feedback channel carried on the downlink shared channel The probability of NACK is compared with the preset probability threshold value of NACK; the comparison module sends the comparison result to the adjustment module of the base station;

Among them, the down-regulation period and up-regulation period can be set in the comparison module. The down-regulation period is a specified transmission power down-adjustment period, which is one or more times the measurement period; the up-regulation period is a specified transmission power up-adjustment period, which is 1 or more times of the measurement period; when setting the down-regulation period and up-regulation period, if the up-regulation period is greater than the down-regulation period, the effect of fast decrease and slow rise of the transmission power adjustment can be achieved; if the up-regulation period is smaller than the down-regulation period, then To achieve the effect of slow drop and fast rise of the transmission power adjustment; in addition, in order to achieve the real required power level of the detection UE, the up-regulation cycle can be made greater than the down-regulation cycle, that is, the mechanism of fast drop and slow rise is used to suppress power fluctuations. Probing to obtain the real required power level of the UE.

Step 103, adjusting the transmit power of the downlink shared channel according to the comparison result;

Specifically, the adjustment module of the base station receives the comparison result sent by the comparison module, and adjusts the transmission power of the downlink shared channel according to the comparison result;

Taking the TBS information as the code rate corresponding to the TBS as an example, if the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the probability of the preset target code rate, greater than the probability threshold of the preset code rate, and the downlink shared channel When the probability of ACK carried on the uplink feedback channel of the channel is greater than the preset ACK probability threshold, that is, when CRP>CRP_TH and P_ACK>P_ACK_TH, the adjustment module adjusts the transmission power of the downlink shared channel downward by one power step, CRP_TH is the probability threshold value of the preset code rate, and P_ACK_TH is the probability threshold value of the preset ACK; otherwise, the adjustment module does not adjust the transmit power of the downlink shared channel; in addition, it also needs to be satisfied: the adjusted transmit power cannot Lower than the preset minimum transmission power; the probability threshold of the preset code rate is set according to the application environment, for example, when it is applied to an indoor environment, since the indoor environment is relatively stable and the change is small, the probability threshold The limit value can be set relatively small; when it is applied to the outdoor environment, because the outdoor environment is relatively unstable and changes greatly, the probability threshold value can be set relatively large;

If the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the probability of the preset target code rate value, less than the probability threshold value of the preset code rate, or the NACK carried on the uplink feedback channel of the downlink shared channel Probability, greater than the preset probability threshold of NACK, that is, when CRP<CRP_TH or P_NACK>P_NACK_TH, the adjustment module adjusts the transmit power of the downlink shared channel upward by one power step; where P_NACK_TH is the preset probability gate of NACK Limit value; otherwise, the adjustment module does not adjust the transmit power of the downlink shared channel; in addition, it also needs to be satisfied: the adjusted transmit power cannot be higher than the set maximum transmit power; the threshold value of the preset probability of ACK and NACK It is set according to the requirements of the operator and the quality of service. For example, for the preset ACK probability threshold, if the service quality requirements are higher, the ACK probability threshold is larger; for the preset NACK The probability threshold value of , if the quality of service requirements are higher, the probability threshold value of NACK is smaller;

Wherein, the power step is set in the adjustment module according to the application environment. For example, when it is applied to an indoor environment, since the indoor environment is relatively stable and the change is small, the power step can be set relatively small; In the outdoor environment, because the outdoor environment is relatively unstable and changes greatly, the power step size can be set relatively large.

In order to realize the above method, the present invention also provides a power control system. Fig. 2 is a schematic structural diagram of the power control system of the present invention. As shown in Fig. 2, the system includes: a statistics module 21, a comparison module 22, an adjustment module 23; where,

Statistical module 21, used to count relevant information of the downlink shared channel;

A comparison module 22, configured to compare the relevant information of the downlink shared channel with a preset threshold value to obtain a comparison result;

The adjustment module 23 is configured to adjust the transmission power of the downlink shared channel according to the comparison result.

The relevant information of the downlink shared channel includes:

The probability that the TBS information selected for the UE on the downlink shared channel is greater than the target TBS information, the probability of ACK and/or the probability of NACK carried on the uplink feedback channel of the downlink shared channel.

The comparison module 22 compares the relevant information of the downlink shared channel with a preset threshold value, and obtains the comparison result as follows:

When the downlink period of the transmit power is reached, the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value is compared with the preset code rate probability threshold value, and the The probability of the ACK carried on the uplink feedback channel of the downlink shared channel is compared with the preset ACK probability threshold;

Or, when the up-regulation period of the transmit power is reached, the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value is compared with the preset probability threshold value of the code rate, or The probability of NACK carried on the uplink feedback channel of the downlink shared channel is compared with a preset NACK probability threshold.

The adjustment module 23 adjusts the transmit power of the downlink shared channel according to the comparison result as:

The probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate is greater than the probability threshold value of the preset code rate, and the probability of the ACK carried on the uplink feedback channel of the downlink shared channel is greater than For the preset probability threshold value of ACK, the adjustment module 23 adjusts the transmission power of the downlink shared channel downward by one power step;

The probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value, less than the probability threshold value of the preset code rate, or the probability of NACK carried on the uplink feedback channel of the downlink shared channel , greater than the preset NACK probability threshold, the adjustment module 23 adjusts the transmit power of the downlink shared channel upward by one power step.

The power control system composed of the statistics module 21, the comparison module 22 and the adjustment module 23 described in the present invention is applied to the base station in the communication system, and the communication system is mainly the third generation mobile communication technology (3G, 3rd-generation) system.

The above description is only a preferred embodiment of the present invention, and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (6)

1. A method for controlling power, the method comprising:

counting the relevant information of the downlink shared channel;

comparing the relevant information of the downlink shared channel with a preset threshold value to obtain a comparison result;

adjusting the sending power of the downlink shared channel according to the comparison result;

wherein, the related information of the downlink shared channel includes: the probability that the Transmission Block Size (TBS) information selected for User Equipment (UE) on a downlink shared channel is larger than target TBS information, and the probability of Acknowledgement Characters (ACK) and/or the probability of non-acknowledgement characters (NACK) borne on an uplink feedback channel of the downlink shared channel;

the method for counting the probability that the TBS information selected for the UE on the downlink shared channel is greater than the target TBS information value comprises the following steps: taking the example that the TBS information is the code rate corresponding to the TBS, in the measurement period, when the statistical module determines that the UE issues one TBS, the counter is updated, that is, Cont _ N is Cont _ N +1, where Cont _ N is the total number of TBSs issued by the UE; calculating a code rate corresponding to the TBS by using a formula CR (TBS/NSize), wherein CR is the code rate corresponding to the TBS, the TBS is the size of a transmission block, and Nsize is the maximum bit number which can be borne by HS-PDSCH resources allocated to the UE; comparing the code rate CR corresponding to the calculated TBS with a preset target code rate value, and if the code rate CR is greater than the target code rate value, updating a counter, namely Cont _ M is Cont _ M + 1; when the measuring period is over, according to the formulaObtaining the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than a preset target code rate value;

the method for counting the probability of ACK and the probability of NACK carried on the uplink feedback channel of the downlink shared channel comprises the following steps: in the measurement period, when the counting module determines that ACK and/or NACK fed back by the UE in the HS-SICH is received, the counting module updates a counter, namely Cont _ B is Cont _ B +1, and Cont _ B is the total times of receiving the ACK and/or NACK fed back by the UE in the HS-SICH; if the ACK is received, updating an ACK counter at the same time, namely Cont _ ACK is Cont _ ACK +1, wherein Cont _ ACK is the number of times of receiving the ACK fed back by the UE in the HS-SICH, if NACK is received, updating a NACK counter at the same time, namely Cont _ NACK is Cont _ NACK +1, and Cont _ NACK is the number of times of receiving the NACK fed back by the UE in the HS-SICH; when the measuring period is over, according to the formulaAnd/orRespectively obtaining the probability of ACK (acknowledgement character) and/or the probability of NACK (negative acknowledgement character) carried on an uplink feedback channel of a downlink shared channel;

wherein the comparing the related information of the downlink shared channel with a preset threshold value comprises:

the TBS information comprises TBS and one of code rates corresponding to the TBS;

when the down-regulation period of the sending power is reached, comparing the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value with the preset probability threshold value of the code rate, and comparing the probability of the ACK loaded on the uplink feedback channel of the downlink shared channel with the preset probability threshold value of the ACK;

the adjusting the transmission power of the downlink shared channel according to the comparison result includes:

and adjusting the sending power of the downlink shared channel downwards by one power step length according to the probability that the corresponding code rate of the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate and the probability threshold value of the preset code rate, and the probability of the ACK carried on the uplink feedback channel of the downlink shared channel is greater than the probability threshold value of the preset ACK.

2. The method of claim 1, wherein the comparing the related information of the downlink shared channel with a preset threshold value:

the TBS information comprises TBS and one of code rates corresponding to the TBS;

when the up-regulation period of the transmission power is reached, the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value is compared with the preset probability threshold value of the code rate, or the probability of NACK carried on the uplink feedback channel of the downlink shared channel is compared with the preset probability threshold value of NACK.

3. The method according to claim 1 or 2, wherein the adjusting the transmission power of the downlink shared channel according to the comparison result is:

and adjusting the sending power of the downlink shared channel by one power step length upwards according to the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is larger than a preset target code rate value and is smaller than a preset code rate probability threshold value, or the probability of NACK carried on the uplink feedback channel of the downlink shared channel is larger than a preset NACK probability threshold value.

4. A system for controlling power, the system comprising: the device comprises a statistic module, a comparison module and an adjusting module; wherein,

the statistic module is used for counting the relevant information of the downlink shared channel;

the comparison module is used for comparing the relevant information of the downlink shared channel with a preset threshold value to obtain a comparison result;

an adjusting module, configured to adjust the transmit power of the downlink shared channel according to the comparison result;

wherein, the related information of the downlink shared channel includes:

the probability that the TBS information selected for the UE on the downlink shared channel is greater than the target TBS information, the probability of ACK and/or the probability of NACK carried on an uplink feedback channel of the downlink shared channel;

the method for counting the probability that the TBS information selected for the UE on the downlink shared channel is greater than the target TBS information value comprises the following steps: taking the example that the TBS information is the code rate corresponding to the TBS, in the measurement period, when the statistical module determines that the UE issues one TBS, the counter is updated, that is, Cont _ N is Cont _ N +1, where Cont _ N is the total number of TBSs issued by the UE; calculating a code rate corresponding to the TBS by using a formula CR (TBS/NSize), wherein CR is the code rate corresponding to the TBS, the TBS is the size of a transmission block, and Nsize is the maximum bit number which can be borne by HS-PDSCH resources allocated to the UE; comparing the code rate CR corresponding to the calculated TBS with a preset target code rate value, and if the code rate CR is greater than the target code rate value, updating a counter, namely Cont _ M is Cont _ M + 1; when the measuring period is over, according to the formulaObtaining the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than a preset target code rate value;

the method for counting the probability of ACK and the probability of NACK carried on the uplink feedback channel of the downlink shared channel comprises the following steps: in the measurement period, when the counting module determines that ACK and/or NACK fed back by the UE in the HS-SICH is received, the counting module updates a counter, namely Cont _ B is Cont _ B +1, and Cont _ B is the total times of receiving the ACK and/or NACK fed back by the UE in the HS-SICH; if the ACK is received, updating an ACK counter at the same time, namely Cont _ ACK is Cont _ ACK +1, wherein Cont _ ACK is the number of times of receiving the ACK fed back by the UE in the HS-SICH, if NACK is received, updating a NACK counter at the same time, namely Cont _ NACK is Cont _ NACK +1, and Cont _ NACK is the number of times of receiving the NACK fed back by the UE in the HS-SICH; when the measuring period is over, according to the formulaAnd/orRespectively obtaining the probability of ACK (acknowledgement character) and/or the probability of NACK (negative acknowledgement character) carried on an uplink feedback channel of a downlink shared channel;

wherein, the comparing module compares the relevant information of the downlink shared channel with a preset threshold value, and the obtained comparison result is: when the down-regulation period of the sending power is reached, comparing the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value with the preset probability threshold value of the code rate, and comparing the probability of the ACK loaded on the uplink feedback channel of the downlink shared channel with the preset probability threshold value of the ACK;

the adjusting module adjusts the sending power of the downlink shared channel according to the comparison result as follows: the probability that the corresponding code rate of the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate and is greater than the preset probability threshold value of the code rate, and the probability of the ACK carried on the uplink feedback channel of the downlink shared channel is greater than the preset probability threshold value of the ACK, and the adjusting module adjusts the sending power of the downlink shared channel by one power step length downwards.

5. The system according to claim 4, wherein the comparing module compares the related information of the downlink shared channel with a preset threshold value, and obtains a comparison result as:

when the up-regulation period of the transmission power is reached, the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is greater than the preset target code rate value is compared with the preset probability threshold value of the code rate, or the probability of NACK carried on the uplink feedback channel of the downlink shared channel is compared with the preset probability threshold value of NACK.

6. The system according to claim 4 or 5, wherein the adjusting module adjusts the transmission power of the downlink shared channel according to the comparison result as follows:

the probability that the code rate corresponding to the TBS selected for the UE on the downlink shared channel is larger than a preset target code rate value and smaller than a preset code rate probability threshold value, or the probability of NACK carried on an uplink feedback channel of the downlink shared channel is larger than a preset NACK probability threshold value, and the adjusting module adjusts the sending power of the downlink shared channel by one power step length upwards.