CN101702824B - Method for controlling power of enhanced uplink absolute grant channel and subscriber terminal - Google Patents

Abstract

The invention provides a method for controlling the power of an enhanced uplink absolute grant channel (E-AGCH) and a subscriber terminal. The method comprises the following steps: demodulating a received E-AGCH and measuring the SNR (signal-to-noise ratio) of the E-AGCH according to the demodulation results; decoding the demodulated E-AGCH and acquiring the RDI (resource duration indicator) carried by the E-AGCH when the E-AGCH is correctly decoded; counting the number Th of the continuously received E-AGCHs until the current sub-frame when the RDI is equal to 0; averaging the Th continuous SNR measured values until the current sub-frame when Th is smaller than the preset threshold, and comparing the average value with the SNR target value to determine the TPC (transmit power control) command word; and predicting the SNR of the following sub-frame according to the Th continuous SNR measured values until the current sub-frame when Th is no smaller than the preset threshold, and comparing the SNR predicted value with the SNR target value to determine the TPC command word. Accordingly, the invention is capable of controlling the power of the E-AGCH more accurately and more effectively.

Description

The Poewr control method of the absolute access grant channel of enhanced uplink and user terminal

Technical field

The invention belongs to wireless communication field, the Poewr control method and the user terminal of the absolute access grant channel of particularly a kind of enhanced uplink (E-AGCH).

Background technology

In the standard of third generation affiliate (3GPP), insert (HSUPA) characteristic in order to support high speed uplink packet, TD SDMA (TD-SCDMA) system uplink has increased Enhanced Uplink Dedicated Channel (E-DCH) newly.E-DCH is a transmission channel, is used to carry the high speed uplink data, and its Transmission Time Interval (TTI) is 5ms; Support high order modulation, and layer 1 (L1) mixes automatic repeat requests (HARQ) process, the resource of its use; Comprise power, time slot, code channel etc., can distribute by base station (NodeB) scheduling.

Also defined two control channels up: up-enhancing control channel (E-UCCH) and enhanced uplink random access channel (E-RUCCH) are used to transmit the relevant signaling information of up enhancing.E-UCCH is in the same place with E-DCH is multiplexing usually, transmits the relevant information of current E-DCH HARQ.E-RUCCH is mapped on the physical accidental access-in resource, is mainly used in the up professional access request that strengthens.

E-DCH is mapped on the enhanced uplink physical channel (E-PUCH); The E-PUCH channel resource be divided into scheduling with two types of non-scheduling; Wherein non-scheduling part is distributed by radio network controller (RNC), and the scheduling part is then dispatched distribution by the MAC-e entity among the NodeB.

At down direction; In order to support base station scheduling; Increased the absolute access grant channel of enhanced uplink (E-AGCH) transmission base station scheduling information, and enhanced uplink HARQ answering indication signal channel (E-HICH) is supported the response information transmission (like ACK/NACK) of HARQ process.

Simultaneously, defined the principle of E-AGCH power control among the 3GPP25.224, the maximum transmission power of high-rise indication E-AGCH can not surpass this maximum power when NodeB is provided with E-AGCH power.The Initial Trans of E-AGCH is determined that by NodeB after the initial transmissions, NodeB will arbitrarily carry out power control to E-AGCH.Control can realize through the power that on scheduling E-PUCH, carries control (TPC) command word that user terminal (UE) sends.UE is through transmission TPC command word on scheduling E-PUCH, thus the transmitted power of control E-AGCH, and the setting of TPC command word should be to reach target Block Error Rate (BLER) purpose of E-AGCH.

Though 3GPP has defined the power control principle of E-AGCH, does not provide concrete power control flow.

Summary of the invention

Technical problem to be solved by this invention provides the Poewr control method and the user terminal of the absolute access grant channel of a kind of enhanced uplink, makes the power of E-AGCH is controlled accurate and effective more.

For solving the problems of the technologies described above, the present invention provides technical scheme following:

The Poewr control method of the absolute access grant channel of a kind of enhanced uplink comprises:

E-AGCH to receiving carries out demodulation, and measures the SNR of said E-AGCH according to demodulation result;

E-AGCH to after the demodulation decodes, and when decoding is correct, obtains the resource continuous indication (RDI) that said E-AGCH carries;

When said RDI equals 0, count on till the current subframe number Th of the E-AGCH that receives continuously;

As Th during, calculate the mean value of continuous T h SNR measured value till the current subframe, and compare to confirm the TPC command word through the SNR desired value that said mean value and exterior ring power control are produced less than first thresholding; When Th is not less than first thresholding, according to the SNR of continuous T h next subframe of SNR measured value prediction till current subframe, and through SNR predicted value and said SNR desired value are compared to confirm the TPC command word;

Said TPC command word is sent to the base station through enhanced uplink physical channel (E-PUCH), make the base station confirm transmitting power E-AGCH according to said TPC command word.

Above-mentioned Poewr control method, wherein, said counting on till the current subframe; The number Th of the E-AGCH that receives continuously specifically comprises: E-AGCH respectively corresponding ESCN and the SFN correct according to nearest twice decoding, confirm whether the E-AGCH of current reception is continuous with the last E-AGCH that receives; If; Th is increased by 1, otherwise Th is set to 1.

Above-mentioned Poewr control method wherein, also comprises: when said RDI is not equal to 0, through correct corresponding SNR measured value and the said SNR desired value of E-AGCH of current decoding compared to confirm the TPC command word.

Above-mentioned Poewr control method wherein, also comprises: when said RDI is not equal to 0, for the E-PUCH that does not have corresponding E-AGCH, alternately fill the TPC command word of " rising power " and " reduction power " therein.

Above-mentioned Poewr control method, wherein, said exterior ring power control comprises:

The number Th2 of the number Th1 of the E-AGCH that statistical decoder is correct and the E-AGCH of decoding error;

As Th2 during greater than second thresholding, heighten said SNR desired value, and with Th1 and Th2 zero clearing;

When Th1 greater than the 3rd thresholding, and Th2 equals at 0 o'clock, turns down said SNR desired value, and with the Th1 zero clearing.

Above-mentioned Poewr control method, wherein, said exterior ring power control also comprises:

Calculate the correct E-AGCH of the nearest twice decoding difference of corresponding SFN respectively;

When said difference during greater than the 4th thresholding, said SNR desired value is set to initial value, and with Th1 and Th2 zero clearing.

Above-mentioned Poewr control method; Wherein, Also comprise: the base station is carried out zero-signal to the E-PUCH of the user terminal that is scheduled and is detected, and when the number of sub frames of the E-PUCH no signal that is consecutively detected said user terminal surpasses the 5th thresholding, starts the open Loop Power control of E-AGCH.

Above-mentioned Poewr control method; Wherein, Also comprise: when there is other physical code channel in the base station on the time slot of the E-AGCH place of the user terminal of confirming to be scheduled; Also the transmitting power of E-AGCH or other physical code channels is adjusted, made the difference of transmitting power of transmitting power and said other physical code channels of E-AGCH be lower than the 6th thresholding.

A kind of user terminal comprises:

Demodulation module is used for the E-AGCH that receives is carried out demodulation;

The snr measurement module is used for measuring according to demodulation result the SNR of said E-AGCH;

Decoder module is used for the E-AGCH after the demodulation is decoded, and when decoding is correct, obtains the RDI that said E-AGCH carries;

First statistical module is used for when said RDI equals 0, counting on till the current subframe number Th of the E-AGCH that receives continuously;

Power control commands word generation module; Be used for as Th during less than first thresholding; Calculate the mean value of continuous T h SNR measured value till the current subframe, and compare to confirm the TPC command word, when Th is not less than first thresholding through the SNR desired value that said mean value and exterior ring power control are produced; According to the SNR of continuous T h next subframe of SNR measured value prediction till current subframe, and through SNR predicted value and said SNR desired value are compared to confirm the TPC command word;

Power control commands word sending module is used for said TPC command word is sent to the base station through E-PUCH, makes the base station confirm the transmitting power to E-AGCH according to said TPC command word.

Above-mentioned user terminal, wherein, said first statistical module is further used for: E-AGCH respectively corresponding ESCN and the SFN correct according to nearest twice decoding; Whether the E-AGCH that confirms current reception is continuous with the last E-AGCH that receives, if Th is increased by 1; Otherwise Th is set to 1.

Above-mentioned user terminal, wherein, said power control commands word generation module also is used for: when said RDI is not equal to 0, through correct corresponding SNR measured value and the said SNR desired value of E-AGCH of current decoding compared to confirm the TPC command word.

Above-mentioned user terminal, wherein, said power control commands word generation module also is used for: when said RDI is not equal to 0, for the E-PUCH that does not have corresponding E-AGCH, alternately fill the TPC command word of " rising power " and " reduction power " therein.

Above-mentioned user terminal wherein, also comprises:

Second statistical module is used for the number Th2 of E-AGCH of number Th1 and the decoding error of the correct E-AGCH of statistical decoder;

The signal-to-noise target value adjusting module is used for heightening said SNR desired value as Th2 during greater than second thresholding, and with Th1 and Th2 zero clearing; When Th1 greater than the 3rd thresholding, and Th2 equals at 0 o'clock, turns down said SNR desired value, and with the Th1 zero clearing.

Above-mentioned user terminal wherein, also comprises:

The outer shroud initialization module is used to calculate the correct E-AGCH of the nearest twice decoding difference of corresponding SFN respectively, and when said difference during greater than the 4th thresholding, said SNR desired value is set to initial value, and with Th1 and Th2 zero clearing.

In the power control process of the E-AGCH of the embodiment of the invention; Add up the number of the E-AGCH that receives continuously earlier; Statistics and first thresholding are compared to confirm to select the average algorithm of link-quality still to select prediction algorithm, like this, when the E-AGCH number that receives continuously more after a little while; Also can guaranteed output control can restrain, make power control more accurately with effective.

Further, when up E-PUCH need send invalid TPC, alternately fill the TPC command word, make NodeB both can ignore these command words, also can respond these command words and the capacity of whole network is had no influence.

Further, NodeB carries out zero-signal to the up E-PUCH of scheduled terminals and detects, and has solved the terminal and has perhaps run into big decline and separate wrong E-AGCH for a long time, the up problem that stops to send E-PUCH because get into the shadow region suddenly.

Description of drawings

Fig. 1 is the Poewr control method flow chart of the E-AGCH of the embodiment of the invention;

Fig. 2 is the embodiment of the invention is filled invalid TPC in E-PUCH a kind of mode sketch map;

Fig. 3 is the embodiment of the invention is filled invalid TPC in E-PUCH an another kind of mode sketch map;

Fig. 4 is the embodiment of the invention is filled invalid TPC in E-PUCH another mode sketch map;

Fig. 5 is the exterior ring power control flow chart of E-AGCH in the embodiment of the invention;

Fig. 6 is the structural representation of the user terminal of the embodiment of the invention.

Embodiment

For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing and specific embodiment to describe the present invention below.

With reference to Fig. 1, the Poewr control method of the E-AGCH of the embodiment of the invention, wherein, carry out following inner loop power control flow in subscriber terminal side:

Step 101: the E-AGCH to receiving carries out demodulation, and measures the SNR of said E-AGCH according to demodulation result;

User terminal demodulation E-AGCH place descending time slot signal extracts the demodulation symbol that belongs to E-AGCH, carries out SNR according to said demodulation symbol and measures.

Step 102: the E-AGCH to after the demodulation decodes, and when decoding is correct, obtains the resource continuous indication (RDI) that said E-AGCH carries;

When RDI equaled 0, if the indication user terminal is scheduled, then to send to the E-AGCH of this user terminal be continuous in the base station.

When RDI was not equal to 0, if the indication user terminal is scheduled, then to send to the E-AGCH of this user terminal be discontinuous in the base station.

Step 103: when said RDI equals 0, count on till the current subframe number Th of the E-AGCH that receives continuously;

When RDI equals 0, comprise two kinds of situation again, a kind of situation is that user terminal is dispatched continuously, like this, sees on the whole that a plurality of E-AGCH that user terminal receives are continuous.

Another kind of situation be user terminal not by continuous scheduling, like this, see on the whole that a plurality of E-AGCH that user terminal receives are discontinuous.For example; The terminal receives the E-AGCH (terminal is scheduled) of 4 sub-frame earlier continuously, after midfeather 3 sub-frame (terminal is not scheduled), receives the E-AGCH (terminal is scheduled) of 4 sub-frame again continuously; Though these 8 E-AGCH part wherein is continuous, is discontinuous on the whole.

In addition, in embodiments of the present invention, the E-AGCH that what is called receives promptly comprises the E-AGCH that decoding is correct, comprises the E-AGCH of decoding error again.

In this step, said counting on till the current subframe, the number Th of the E-AGCH that receives continuously; Comprise: E-AGCH respectively corresponding E-AGCH cyclic sequence number (ESCN) and the subframe numbers (SFN) correct according to nearest twice decoding, confirm whether the E-AGCH (decoding is correctly) of current reception is continuous with the last E-AGCH that receives (it is correct to decode, also the possibility decoding error); If; Th is increased by 1, otherwise Th is set to 1.

Wherein, ECSN is also carried by E-AGCH, and its initial value is 0, and NodeB is every to send an E-AGCH to UE, and this value just increases once automatically.

So, in this step, calculate first between the corresponding respectively ESCN of the correct E-AGCH of nearest twice decoding earlier at interval; And calculate second between the corresponding respectively SFN of the correct E-AGCH of nearest twice decoding at interval; Judge then whether said first equate with said second at interval at interval, if confirm that then the E-AGCH of current reception is continuous with the last E-AGCH that receives; Otherwise, confirm that the E-AGCH of current reception is discontinuous with the last E-AGCH that receives.

For example, in the TD-SCDMA system, the span of ESCN is 0～7, and the span of SFN is 0～8191, then decode when correct as new E-AGCH, relatively before and after the twice E-AGCH subframe numbers when correct: SFN ' that decodes _iAnd SFN ' _I-1, and the cyclic sequence that obtains of decoding number: ECSN _iAnd ECSN _I-1, if (SFN ' _i-SFN ' _I-1) %8192=(ECSN _i-ECSN _I-1) the %8 establishment, confirm that then the E-AGCH of current reception is continuous with the last E-AGCH that receives, otherwise, confirm that the E-AGCH of current reception and the last E-AGCH that receives are discontinuous.

Step 104: whether judge Th less than first thresholding (Th_Pred), if, get into step 105, otherwise, step 107 got into;

Step 105: the mean value that calculates continuous T h SNR measured value till the current subframe;

Step 106: the SNR desired value through to said mean value and exterior ring power control generation compares to confirm the TPC command word, then, gets into step 109;

That is,, produce the TPC command word with following mode as Th during less than Th_Pred:

Wherein, TPC=" down " expression rising power, TPC=" up " expression reduces power, and SNR_target is the SNR desired value.

Step 107: according to the SNR of continuous T h next subframe of SNR measured value prediction till current subframe;

Step 108: through SNR predicted value and said SNR desired value are compared to confirm the TPC command word;

That is, as Th during more than or equal to Th_Pred, use prediction algorithm, such as least square method, the prediction link-quality also produces corresponding TPC command word:

Wherein, func_pred is the link-quality anticipation function, except least square method, can also be other known prediction algorithms.

Step 109: said TPC command word is sent to the base station through enhanced uplink physical channel (E-PUCH), make the base station confirm transmitting power to E-AGCH according to said TPC command word.

After executing this step, return step 101, carry out operation next subframe.

In the above-mentioned inner loop power control procedure of the embodiment of the invention; Add up the number of the E-AGCH that receives continuously earlier; Statistics and first thresholding are compared to confirm to select the average algorithm of link-quality still to select prediction algorithm, like this, when the E-AGCH number that receives continuously more after a little while; Also can guaranteed output control can restrain, make power control more accurately with effective.

When said RDI is not equal to 0; Except producing according to the method for prior art the TPC command word; The embodiment of the invention also provides the production method of following TPC command word: when said RDI is not equal to 0, through correct corresponding SNR measured value and the said SNR desired value of E-AGCH of current decoding compared to confirm the TPC command word.

Be specially:

In addition, when said RDI is not equal to 0,, alternately fill the TPC command word of " rising power " and " reduction power " therein for the E-PUCH that does not have corresponding E-AGCH.Because it is right that the number of E-PUCH, makes that the part E-PUCH of user terminal does not have corresponding E-AGCH to form closed power control greater than the number of E-AGCH, then need in this E-PUCH, fill invalid TPC command word, can fill according to following mode:

Mode one will not have the invalid TPC command word among the corresponding up E-PUCH of descending E-AGCH alternately to be filled to " up " and " down ", and will be as shown in Figure 2.

Mode two will not have the invalid TPC command word among the corresponding up E-PUCH of descending E-AGCH alternately to be filled to " down " and " up ", and will be as shown in Figure 3.

Mode three will not have the invalid TPC command word of the corresponding up E-PUCH of descending E-AGCH alternately to fill, and wherein first invalid TPC command word is set to and a nearest TPC command word that effective TPC command word is opposite, and is as shown in Figure 4.

Mode four, NodeB ignores the invalid TPC command word of carrying on the up E-PUCH.

The effect of exterior ring power control is the adjustment of carrying out SNR_target according to quality of service.For external circule power control; Can adopt the method for prior art, promptly add up the Block Error Rate (BLER) of E-AGCH, BLER statistical value and target BLER are compared; Obtain the SNR desired value of a real-time update, and this SNR desired value is configured to the use of inner-loop power control process.

In addition, the embodiment of the invention also provides following outer-loop power controlling method.

With reference to Fig. 5, said outer-loop power controlling method comprises the steps:

Step 501: user terminal receives E-AGCH, and said E-AGCH is carried out the demodulation sign indicating number;

Step 502: whether the decoded result of judging current E-AGCH is correct, if, get into step 503, otherwise, step 501 returned;

Step 503: write down current cyclic sequence ECSN _i, and current subframe numbers SFN ' _i

Step 504～505: judge the correct E-AGCH of nearest twice decoding respectively the difference of corresponding SFN whether greater than the 4th thresholding, if control is carried out returning step 501 after the initialization to exterior ring power, otherwise, get into step 506;

Calculate the correct SFN ' constantly of current E-AGCH decoding _iWith the correct SFN ' constantly of the last E-AGCH decoding _I-1Between time difference (SFN ' _i-SFN ' _I-1) %8192 (and unit: subframe),, explain that the correct time interval of twice decoding is longer when said time difference during greater than the 4th thresholding, need be to exterior ring power control carrying out initialization, thus make to the power control of E-AGCH more accurate.

Initialization is carried out in exterior ring power control be meant that the SNR desired value is set to initial value, and with Th1 and Th2 zero clearing, wherein, Th1 and Th2 are respectively the number of E-AGCH of number and the decoding error of the correct E-AGCH that decodes.

Said the 4th thresholding is according to the real needs setting, and preferably, it is set to 8 * Period_EAGCH; Wherein, Period_EAGCH is the transmission cycle when being scheduled (terminal is double, the transmission time interval of E-AGCH) of E-AGCH, and the RDI that carries through E-AGCH looks into following table and obtains.

RDI	The TTI that distributes	TTI at interval	The transmission cycle (TTI)
				0	1	1	1
1	2	1	2
				2	2	2	4
3	2	4	8
				4	4	1	4
5	4	2	8
				6	4	4	16
7	8	1	8

Step 506: the E-AGCH number Th2 of the number Th1 of the E-AGCH that statistical decoder is correct and decoding error;

The statistical method of Th1 is: during the exterior ring power initialization, and Th1=0 in addition, the correct E-AGCH of every decoding then increases by 1 with Th1, that is, and Th1=Th1+1.

The statistical method of Th2 is: during the exterior ring power initialization; Th2=0 in addition, the correct E-AGCH of every decoding calculates the E-AGCH number Err_Blk of the correct E-AGCH of current decoding and the last decoding error between the correct E-AGCH of decoding earlier; Then Th2 is increased Err_Blk, that is:

Th2＝Th2+Err_Blk

Wherein, the computational methods of Err_Blk do, obtain the cyclic sequence that carries among the correct E-AGCH of current decoding and the correct E-AGCH of last decoding number respectively, and the spacing value of this two cyclic sequences number is Err_Blk, for example, and in the TD-SCDMA system:

Err_Blk＝(ECSN _i-ECSN _i-1)％8-1

Step 507: the Th1 and the Th2 that obtain according to statistics adjust the SNR desired value.

If the E-AGCH number Th2 of decoding error then heighten said SNR desired value, and with Th1 and Th2 zero clearing, preferably, the adjustment mode is greater than second thresholding (Th_Err):

SNR_target＝SNR_target+Th2×step_size

Wherein, step_size is the minimum adjustment step-length of the SNR_target of exterior ring power control.

If the sum of the E-AGCH that receives is greater than the 3rd thresholding (Th_Right), and neither one E-AGCH separates mistake (be equivalent to, Th1 is greater than the 3rd thresholding, and Th2 equals 0), then turn down said SNR desired value, and with the Th1 zero clearing, preferably, the adjustment mode is:

SNR_target＝SNR_target-step_size

The above is exterior ring power control procedure and inner loop power control procedure at the E-AGCH of subscriber terminal side execution.

When the user terminal that is scheduled continuously gets into the shadow region; Perhaps run into deep fade suddenly; Terminal continuous decoding E-AGCH failure possibly, thus can to fall be zero (E-PUCH is not sent at the terminal) to the HSUPA uplink data rate that causes the terminal, like this; The base station can remain unchanged to the transmitting power of E-AGCH, and this will cause the terminal to E-AGCH decoding error always.Therefore, in inventive embodiment, also launch open Loop Power control in this case to E-AGCH.

Particularly; NodeB receives upward signal; The E-PUCH of the user terminal that is scheduled is carried out zero-signal detect, when the number of sub frames of the E-PUCH no signal that is consecutively detected said user terminal surpasses the 5th thresholding (Th_Sbfrm), start the open Loop Power control of E-AGCH.

It is following that zero-signal detects detection method:

Step 1 is calculated the terminal channel estimating window power p that is scheduled _h, and channel estimation window power and noise ratio $\mathrm{Ratio}=p_h/{\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="2"\; label="AV"\; filenames="H2009102412274E00021.png,H2009102412274E00022.png"\; state="\{\{state\}\}">AV</figure-callout>}}^2$

Step 2, the relation of Ratio and thresholding γ relatively, whether judge that scheduled terminals is up has an existence of E-PUCH signal:

If Ratio is greater than γ, then the E-PUCH signal exists, otherwise the E-PUCH signal does not exist.

Surpass Th_Sbfrm if NodeB is consecutively detected the up E-PUCH no signal sub-frame number at the terminal that is scheduled, then start the open Loop Power control of E-AGCH, that is, the transmitted power of E-AGCH is carried out initialization.

If NodeB detects the up E-PUCH of existence signal; The E-PUCH signal is carried out demodulation; Take out TPC corresponding symbol in the demodulation symbol, and the TPC symbol at the current terminal of demodulation is declared firmly, declare the be scheduled transmitted power P of E-AGCH at terminal of sign computation firmly according to TPC _E-AGCHPerhaps, ignore the TPC command word of carrying on the E-PUCH that does not have corresponding descending E-AGCH pairing.

In addition; Be not defined in power relation between a plurality of physical code channels that same time slot belongs to different coding composite transport channel (CCTrCH) in the 3GPP standard yet; If difference power is excessive in the network of network of reality; Lower powered physical code channel " is covered " in high-power physical code channel meeting, reduces the capacity of network and the decoding capability at terminal, thereby influences the up throughput of HSUPA.Therefore; In an embodiment of the present invention; When there is other physical code channel in the base station on the time slot of the E-AGCH place of the user terminal of confirming to be scheduled; Also the transmitting power of E-AGCH or other physical code channels is adjusted, made the difference of transmitting power of transmitting power and said other physical code channels of E-AGCH be lower than the 6th thresholding (P _{CODE_DIF_MAX}).

For example, can adjust the transmitted power of corresponding physical code channel according to following method:

Wherein, P _{PhCH_other}Be the physical code channel power of other activation on the terminal E-AGCH place time slot that is scheduled, P _{E_AGCH}Be the transmitting power of the current terminal E-AGCH that is scheduled, P _{CODE_DIF_MAX}The difference power that same time slot solid size road is maximum, P _{PhCH_max}Terminal E-AGCH place time slot activates maximum transmitted power in the set of physics sign indicating number in order to be scheduled.

Corresponding to the Poewr control method of the above-mentioned E-AGCH of the embodiment of the invention, below introduce the user terminal of the embodiment of the invention.

With reference to Fig. 6, said user terminal comprises: demodulation module, snr measurement module, decoder module, first statistical module, power control commands word generation module, power control commands word sending module, second statistical module, signal-to-noise target value adjusting module and outer shroud initialization module.

Demodulation module is used for the E-AGCH that receives is carried out demodulation.

The snr measurement module is used for measuring according to demodulation result the SNR of said E-AGCH.

Decoder module is used for the E-AGCH after the demodulation is decoded, and when decoding is correct, obtains the RDI that said E-AGCH carries.When RDI equaled 0, if the indication user terminal is scheduled, then to send to the E-AGCH of this user terminal be continuous in the base station; When RDI was not equal to 0, if the indication user terminal is scheduled, then to send to the E-AGCH of this user terminal be discontinuous in the base station.

First statistical module is used for when said RDI equals 0, counting on till the current subframe number Th of the E-AGCH that receives continuously.

When RDI equals 0, comprise two kinds of situation again, a kind of situation is that user terminal is dispatched continuously, like this, sees on the whole that a plurality of E-AGCH that user terminal receives are continuous.

Another kind of situation be user terminal not by continuous scheduling, like this, see on the whole that a plurality of E-AGCH that user terminal receives are discontinuous.For example; The terminal receives the E-AGCH (terminal is scheduled) of 4 sub-frame earlier continuously, after midfeather 3 sub-frame (terminal is not scheduled), receives the E-AGCH (terminal is scheduled) of 4 sub-frame again continuously; Though these 8 E-AGCH part wherein is continuous, is discontinuous on the whole.

In addition, in embodiments of the present invention, the E-AGCH that what is called receives promptly comprises the E-AGCH that decoding is correct, comprises the E-AGCH of decoding error again.

Particularly, said first statistical module advances E-AGCH respectively corresponding ESCN and the SFN correct according to nearest twice decoding, confirms whether the E-AGCH of current reception is continuous with the last E-AGCH that receives, if Th is increased by 1, otherwise Th is set to 1.

Wherein, ECSN is also carried by E-AGCH, and its initial value is 0, and NodeB is every to send an E-AGCH to UE, and this value just increases once automatically.

So; Said first statistical module calculates first between the corresponding respectively ESCN of the correct E-AGCH of nearest twice decoding earlier at interval, and calculates second between the corresponding respectively SFN of the correct E-AGCH of nearest twice decoding at interval, judges then whether said first equate with said second at interval at interval; If; The E-AGCH that then confirms current reception is continuous with the last E-AGCH that receives, otherwise, confirm that the E-AGCH of current reception is discontinuous with the last E-AGCH that receives.

Power control commands word generation module; Be used for as Th during less than first thresholding (Th_Pred); Calculate the mean value of continuous T h SNR measured value till the current subframe; And the SNR desired value that produces through the control to said mean value and exterior ring power compares to confirm the TPC command word; When Th is not less than first thresholding (Th_Pred), according to the SNR of continuous T h next subframe of SNR measured value prediction till current subframe, and through SNR predicted value and said SNR desired value are compared to confirm the TPC command word.

That is,, produce the TPC command word with following mode as Th during less than Th_Pred:

Wherein, TPC=" down " expression rising power, TPC=" up " expression reduces power, and SNR_target is the SNR desired value.

As Th during more than or equal to Th_Pred, use prediction algorithm, such as least square method, the prediction link-quality also produces corresponding TPC command word:

Wherein, func_pred is the link-quality anticipation function, except least square method, can also be other known prediction algorithms.

Power control commands word sending module is used for said TPC command word is sent to the base station through E-PUCH, makes the base station confirm the transmitting power to E-AGCH according to said TPC command word.

Further, said power control commands word generation module also is used for: when said RDI is not equal to 0, through correct corresponding SNR measured value and the said SNR desired value of E-AGCH of current decoding compared to confirm the TPC command word.

Be specially:

Further, said power control commands word generation module also is used for: when said RDI is not equal to 0, for the E-PUCH that does not have corresponding E-AGCH, alternately fill the TPC command word of " rising power " and " reduction power " therein.

More than each module accomplished the control of the inner loop power of E-AGCH, below each module be used for the exterior ring power control of E-AGCH.

Second statistical module is used for the number Th2 of E-AGCH of number Th1 and the decoding error of the correct E-AGCH of statistical decoder.

The statistical method of Th1 is: during the exterior ring power initialization, and Th1=0 in addition, the correct E-AGCH of every decoding then increases by 1 with Th1, that is, and Th1=Th1+1.

The statistical method of Th2 is: during the exterior ring power initialization; Th2=0 in addition, the correct E-AGCH of every decoding calculates the E-AGCH number Err_Blk of the correct E-AGCH of current decoding and the last decoding error between the correct E-AGCH of decoding earlier; Then Th2 is increased Err_Blk, that is:

Th2＝Th2+Err_Blk

Wherein, the computational methods of Err_Blk do, obtain the cyclic sequence that carries among the correct E-AGCH of current decoding and the correct E-AGCH of last decoding number respectively, and the spacing value of this two cyclic sequences number is Err_Blk, for example, and in the TD-SCDMA system:

Err_Blk＝(ECSN _i-ECSN _i-1)％8-1

The signal-to-noise target value adjusting module is used for heightening said SNR desired value as Th2 during greater than second thresholding (Th_Err), and with Th1 and Th2 zero clearing; When Th1 greater than the 3rd thresholding (Th_Right), and Th2 equals at 0 o'clock, turns down said SNR desired value, and with the Th1 zero clearing.

Preferably, said heighten and turn down be respectively:

SNR_target＝SNR_target+Th2×step_size

SNR_target＝SNR_target-step_size

The outer shroud initialization module is used to calculate the correct E-AGCH of the nearest twice decoding difference of corresponding SFN respectively, and when said difference during greater than the 4th thresholding, said SNR desired value is set to initial value, and with Th1 and Th2 zero clearing.

In sum; In the power control process of the E-AGCH of the embodiment of the invention, the number of the E-AGCH that receives continuously of statistics earlier compares to confirm that with the statistics and first thresholding average algorithm of selection link-quality still selects prediction algorithm; Like this; When the E-AGCH number that receives continuously more after a little while, also can guaranteed output control can restrain, make power control more accurately with effectively.When up E-PUCH need send invalid TPC, alternately fill the TPC command word, make NodeB both can ignore these command words, also can respond these command words and the capacity of whole network is had no influence.NodeB carries out zero-signal to the up E-PUCH of scheduled terminals and detects, and has solved the terminal and has perhaps run into big decline and separate wrong E-AGCH for a long time, the up problem that stops to send E-PUCH because get into the shadow region suddenly.

Should be noted that at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Those of ordinary skill in the art is to be understood that; Can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (14)

1. the Poewr control method of the absolute access grant channel E-AGCH of enhanced uplink is characterized in that, comprising:

E-AGCH to receiving carries out demodulation, and measures the signal to noise ratio snr of said E-AGCH according to demodulation result;

E-AGCH to after the demodulation decodes, and when decoding is correct, obtains the resource continuous indication RDI that said E-AGCH carries;

When said RDI equals 0, count on till the current subframe number Th of the E-AGCH that receives continuously;

As Th during, calculate the mean value of continuous T h SNR measured value till the current subframe, and compare to confirm that through the SNR desired value that said mean value and exterior ring power control are produced power controls the TPC command word less than first thresholding; When Th is not less than first thresholding, according to the SNR of continuous T h next subframe of SNR measured value prediction till current subframe, and through SNR predicted value and said SNR desired value are compared to confirm the TPC command word;

Said TPC command word is sent to the base station through enhanced uplink physical channel E-PUCH, make the base station confirm transmitting power E-AGCH according to said TPC command word.

2. Poewr control method as claimed in claim 1 is characterized in that, said counting on till the current subframe, and the number Th of the E-AGCH that receives continuously specifically comprises:

E-AGCH respectively corresponding E-AGCH cyclic sequence ESCN and the subframe numbers SFN correct according to nearest twice decoding confirms whether the E-AGCH of current reception is continuous with the last E-AGCH that receives, if Th is increased by 1, otherwise Th is set to 1.

3. Poewr control method as claimed in claim 1 is characterized in that, also comprises:

When said RDI is not equal to 0, through correct corresponding SNR measured value and the said SNR desired value of E-AGCH of current decoding compared to confirm the TPC command word.

4. method as claimed in claim 3 is characterized in that, also comprises:

When said RDI is not equal to 0,, alternately fill the TPC command word of " rising power " and " reduction power " therein for the E-PUCH that does not have corresponding E-AGCH.

5. the method for claim 1 is characterized in that, said exterior ring power control comprises:

The number Th2 of the number Th1 of the E-AGCH that statistical decoder is correct and the E-AGCH of decoding error;

As Th2 during greater than second thresholding, heighten said SNR desired value, and with Th1 and Th2 zero clearing;

When Th1 greater than the 3rd thresholding, and Th2 equals at 0 o'clock, turns down said SNR desired value, and with the Th1 zero clearing.

6. method as claimed in claim 5 is characterized in that, said exterior ring power control also comprises:

Calculate the correct E-AGCH of the nearest twice decoding difference of corresponding SFN respectively;

When said difference during greater than the 4th thresholding, said SNR desired value is set to initial value, and with Th1 and Th2 zero clearing.

7. the method for claim 1 is characterized in that, also comprises:

The base station is carried out zero-signal to the E-PUCH of the user terminal that is scheduled and is detected, and when the number of sub frames of the E-PUCH no signal that is consecutively detected said user terminal surpasses the 5th thresholding, starts the open Loop Power control of E-AGCH.

8. the method for claim 1 is characterized in that, also comprises:

When there is other physical code channel in the base station on the time slot of the E-AGCH place of the user terminal of confirming to be scheduled; Also the transmitting power of E-AGCH or other physical code channels is adjusted, made the difference of transmitting power of transmitting power and said other physical code channels of E-AGCH be lower than the 6th thresholding.

9. a user terminal is characterized in that, comprising:

Demodulation module is used for the E-AGCH that receives is carried out demodulation;

The snr measurement module is used for measuring according to demodulation result the SNR of said E-AGCH;

Decoder module is used for the E-AGCH after the demodulation is decoded, and when decoding is correct, obtains the RDI that said E-AGCH carries;

First statistical module is used for when said RDI equals 0, counting on till the current subframe number Th of the E-AGCH that receives continuously;

Power control commands word generation module; Be used for as Th during less than first thresholding; Calculate the mean value of continuous T h SNR measured value till the current subframe, and compare to confirm the TPC command word, when Th is not less than first thresholding through the SNR desired value that said mean value and exterior ring power control are produced; According to the SNR of continuous T h next subframe of SNR measured value prediction till current subframe, and through SNR predicted value and said SNR desired value are compared to confirm the TPC command word;

Power control commands word sending module is used for said TPC command word is sent to the base station through E-PUCH, makes the base station confirm the transmitting power to E-AGCH according to said TPC command word.

10. user terminal as claimed in claim 9 is characterized in that, said first statistical module is further used for:

E-AGCH respectively corresponding ESCN and the SFN correct according to nearest twice decoding confirms whether the E-AGCH of current reception is continuous with the last E-AGCH that receives, if Th is increased by 1, otherwise Th is set to 1.

11. user terminal as claimed in claim 9 is characterized in that, said power control commands word generation module also is used for:

When said RDI is not equal to 0, through correct corresponding SNR measured value and the said SNR desired value of E-AGCH of current decoding compared to confirm the TPC command word.

12. user terminal as claimed in claim 11 is characterized in that, said power control commands word generation module also is used for:

When said RDI is not equal to 0,, alternately fill the TPC command word of " rising power " and " reduction power " therein for the E-PUCH that does not have corresponding E-AGCH.

13. user terminal as claimed in claim 9 is characterized in that, also comprises:

Second statistical module is used for the number Th2 of E-AGCH of number Th1 and the decoding error of the correct E-AGCH of statistical decoder;

The signal-to-noise target value adjusting module is used for heightening said SNR desired value as Th2 during greater than second thresholding, and with Th1 and Th2 zero clearing; When Th1 greater than the 3rd thresholding, and Th2 equals at 0 o'clock, turns down said SNR desired value, and with the Th1 zero clearing.

14. user terminal as claimed in claim 13 is characterized in that, also comprises:

The outer shroud initialization module is used to calculate the correct E-AGCH of the nearest twice decoding difference of corresponding SFN respectively, and when said difference during greater than the 4th thresholding, said SNR desired value is set to initial value, and with Th1 and Th2 zero clearing.

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