CN101030798A - Method for controlling high-speed down shared channel HS-SICH closed-loop power - Google Patents

Abstract

The method comprises: when the HS-SICH quality of a certain UE can't be measured and updated in long time due to the overlong scheduling interval, the variance values of actual channel quality of UE uplink DPCH is summarized; taking off the variation of self-emitting power of DPCH, and making the estimation for the quality of HS-SICH accordingly; then using the TPC command word generated with estimation value to control the next HS-SICH power of said UE.

Description

The method of the HS-SICH closed power control of high speed descending sharing channel

Technical field

The present invention relates to code division multiple access system, relate in particular to a kind of method of utilizing up shared information channel (HS-SICH) the closed power control of the auxiliary high speed descending sharing channel (HS-DSCH) of uplink special physical channel (DPCH) information in synchronous time division code division multiple access (TD-SCDMA) system.

Background technology

Power control is an important technology of cdma system.Because the cdma system that 3G adopts all is the identical networking mode, therefore can control the interference and the load of whole network by power controlling, power control can also have the near-far interference of overcoming in addition, a series of advantages such as asthenia.

In following document, disclosed content about the control of cdma system power:

[1] CN1728585A " method that is used for Circuit-switched forward link power control in a kind of TD-SCDMA system ";

[2] CN1728586A " method that is used for the forward link power control of packet switching in a kind of TD-SCDMA system ";

[3] CN1479541A " a kind of time-division duplex (TDD CDMA) system power control method and device ";

[4] CN1551526A " output control device of tdd CDMA mobile communication system and method ";

[5] CN1578489A " Poewr control method of mobile communication system ".

Ring control and outer shroud control two parts in the control of the closed power of traditional uplink special physical channel (DPCH) is divided in the TD-SCDMA system.Inner loop power is controlled at base-station node (Node B) side and finishes, mainly be that the up DPCH demodulation symbol signal interference ratio (SIR) that Node B will measure and suitably handle after (as level and smooth, prediction) compares with the sir target value of setting, the former then is made as " downward modulation " with power control commands word TPC by height, the former low or etc. then power control commands word TPC is made as " rise ".And being controlled at base station controller (RNC), finishes exterior ring power, mainly be dynamically to set rational sir target value according to the Block Error Rate in the special measurement (BLER) statistics and according to suitable RRM (RRM) algorithm, and dispose B, thereby influence the effect of inner loop power control to Node by system message.

Different with traditional up DPCH, for some user terminals (UE), the distribution of up HS-SICH channel resource is by the decision of the scheduler of the MAC-hs protocol sublayers that is arranged in Node B.Although a certain HS-SICH physical channel is continuous effective for Node B, it is to be shared by a plurality of UE.Therefore for some UE, the appearance of its HS-SICH is not only not necessarily continuous, and cycle not necessarily.The UE that some service priority are not high or quality of wireless channel is relatively poor may can not get scheduling the long period, the appearance that is to say its adjacent HS-SICH long time (for example more than ten TTI) of will being separated by to more than 20 5 milliseconds of length, if therefore this moment, Node B acted on the follow-up HS-SICH closed power adjustment of this UE according to the last HS-SICH quality of reception generation power control commands word long ago of certain UE, the very big reduction of front and back channel relevancy will cause the severe exacerbation of closed-loop power control effect so.

Summary of the invention

In view of this, for defective and the deficiency that overcomes prior art, the object of the present invention is to provide the method for utilizing the auxiliary HS-SICH closed power control of up DPCH information in a kind of TD-SCDMA system, because the HS-SICH channel quality of certain UE of the long initiation of scheduling interval can not get measuring the moment of renewal for a long time, the variable quantity (deduction falls the adjustment variable effect of DPCH self transmitting power) of the up DPCH actual channel quality of this UE of accumulative total, and in view of the above the channel quality of HS-SICH is made a prediction, produce the power adjustment that the TPC command word is used to control the follow-up HS-SICH of this UE according to predicted value then.

In order to achieve the above object, a kind of method of utilizing the auxiliary HS-SICH closed power control of up DPCH information in the synchronous time division code division multiple access system of the present invention may further comprise the steps:

1) if Node B receives new HS-SICH, then the sir measurement value according to this HS-SICH independently produces corresponding TPC command word, carries out subsequent power control, and execution in step 2); Can not get upgrading in the scope at the fixed time if the channel quality of HS-SICH is the sir measurement value, Node B just starts the auxiliary HS-SICH closed power control of up DPCH information, execution in step 3);

2) Node B with moment of newly receiving HS-SICH as the reference point, the measurement SIR of up DPCH puts SIR as reference with this moment, poor with the measurement SIR of up DPCH of follow-up arbitrary moment and this reference point SIR then, the adjustment of up DPCH transmitting power in deduction falls during this period of time again is with this SIR variable quantity prediction as distance reference point HS-SICH constantly;

3) in the auxiliary HS-SICH closed power control stage of up DPCH information, as long as the HS-SICH channel quality does not upgrade always, just with the last, it is the SIR variable quantity prediction that the sir measurement value of the HS-SICH of reference point adds the HS-SICH that step 2 obtains, obtain the SIR predicted value of current time HS-SICH, and produce corresponding TPC command word according to this HS-SICH SIR predicted value, carry out subsequent power control; If receive new HS-SICH, just return step 1) in this stage.

The adjustment of up DPCH transmitting power was meant that deduction falls the accumulative total TPC power control commands word that is used to control up DPCH that effective Node B issues during this period of time in described deduction fell during this period of time.

The SIR change information of the periodic up DPCH that utilization of the present invention measures is assisted the SIR of prediction HS-SICH, can still can produce power control commands word more accurately when HS-SICH is separated by for a long time.

These and other advantage of the present invention, target, to set forth in the following description to a certain extent with feature, and to a certain extent, based on being conspicuous to those skilled in the art, perhaps can obtain instruction from the practice of the present invention to investigating hereinafter.Target of the present invention and other advantages can be passed through following specification, claims, and the specifically noted structure realizes and obtains in the accompanying drawing.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, wherein:

Fig. 1 is for utilizing the schematic diagram of the auxiliary HS-SICH closed power control of up DPCH information in the TD-CDMA system;

Fig. 2 is the SIR predictive compensation amount δ of the auxiliary HS-SICH closed-loop power control of the up DPCH information of step a _SICH(k _u, the schematic diagram of renewal process n);

Fig. 3 is the schematic diagram of the SIR renewal process of the auxiliary HS-SICH closed-loop power control of the up DPCH information of step b.

Embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.

Stipulate according to the 3GPP agreement, network side will dispose at least one up DPCH for the UE that adopts the down high speed grouped data to insert (HSDPA) technology, it can be concurrent traditional voice service, also can be the up DPCH of following that transmits signaling message specially, and (it is 1 that the DPCH division cycle for example is set) periodically appear or even occur continuously in up DPCH.Can think, deduction falls after up DPCH and HS-SICH self transmitting power adjustment different, the variation of both demodulation symbol signal interference ratios (SIR) has stronger correlation, therefore we assist the SIR that predicts HS-SICH at the SIR change information that just can make full use of the periodic up DPCH that measures, so that still can produce power control commands word more accurately when HS-SICH is separated by for a long time.

According to the present invention, because the HS-SICH channel quality of certain UE of the long initiation of scheduling interval can not get measuring the moment of renewal for a long time, the variable quantity (deduction falls the adjustment variable effect of DPCH self transmitting power) of the up DPCH actual channel quality of this UE of accumulative total, and in view of the above the channel quality of HS-SICH is made a prediction, produce the power adjustment that the TPC command word is used to control the follow-up HS-SICH of this UE according to predicted value then.Its specific implementation step is as follows:

1) if the channel quality of HS-SICH, promptly the sir measurement value can not get upgrading in the certain hour scope, Node B is with regard to setting up procedure 3) in the method for the auxiliary HS-SICH closed power control of up DPCH information; Otherwise Node B produces the TPC command word independently according to the channel quality of HS-SICH self carries out closed power control;

2) each Node B receives HS-SICH, just will being somebody's turn to do constantly, the measurement SIR of up DPCH puts SIR as reference, poor with the measurement SIR in follow-up arbitrary moment and this reference point SIR then, the adjustment of up DPCH transmitting power in deduction falls during this period of time again, the TPC command word that is used to control up DPCH that effective Node B issues in promptly adding up is during this period of time predicted as distance reference point HS-SICH SIR variable quantity constantly with this;

3) when the stage that enters the auxiliary HS-SICH closed power control of up DPCH information according to step 1), as long as the HS-SICH channel quality does not upgrade always, just with the last, it is the SIR variable quantity prediction that the sir measurement value of reference point HS-SICH adds the HS-SICH that step 2 obtains, obtain the SIR predicted value of this moment HS-SICH, and produce corresponding TPC command word according to this HS-SICH SIR predicted value;

4) in a single day receive new HS-SICH, then the sir measurement value according to this HS-SICH independently produces corresponding TPC command word in the certain hour scope, and carry out the statistic processes of the auxiliary HS-SICH variable quantity prediction of the up DPCH information of a new round according to step 2.

Referring to Fig. 1, Fig. 1 shows the flow process of utilizing the auxiliary HS-SICH closed power control of up DPCH information in the TD-CDMA system.

The parameter declaration that processing procedure relates to below at first introducing:

UpdateFlag_ δ _SICH(k _u, n): user k _uThe HS-SICH updating mark of n subframe;

SIR _DPCH(k _u, n): user k _uThe up DPCH of n subframe measures SIR;

SIR _{Ref_dpch}(k _u): be used for assisted user k _uThe up DPCH SIR reference point of HS-SICH power control;

δ _SICH(k _u, n): user k _uThe HS-SICH SIR predictive compensation amount of n subframe;

CntTPC (k _u): be used for assisted user k _uThe TPC accumulator of HS-SICH power control;

SIR _{Ctrl_SICH}(k _u, n): the n subframe is to n+1 subframe user k _uThe predicted value of up HS-SICH demodulation Signal to Interference plus Noise Ratio;

TPC _{UL_SICH} ^*(k _u, n): (containing the n+1 subframe) is to user k after the n+1 subframe that the n subframe generates _uThe HS-SICH power control equivalent command word (the power control prediction algorithm is used) that works;

SIR _SICH(K _u, n): user k _uThe HS-SICH of n subframe measures SIR;

SIR _{Ref_sich}(k _u): user k _uThe HS-SICH SIR reference point of the auxiliary HS-SICH power control of up DPCH;

SIR _{Tgt_SICH}: HS-SICH closed-loop power control sir target value;

T _SICH(k _u): user k _uThe startup judgement timer of the auxiliary HS-SICH power control of up DPCH is initialized as 0 when RL sets up;

TPC _{UL_DPCH} ^*(k _u, n): the n+1 subframe that the n subframe generates is to user k _uThe up DPCH power control equivalent command word that works;

The I:SIR Prediction distance is a unit with 5 milliseconds of subframes;

L _DPCH: the startup thresholding of the auxiliary HS-SICH closed-loop power control of up DPCH;

P _{Step_UL}: uplink power control is adjusted step-length;

Current subframe n user k _uThe generation and the processing procedure that issues of HS-SICH power control commands word as follows:

Step a: the SIR predictive compensation amount δ of the auxiliary HS-SICH closed-loop power control of up DPCH information _SICH(k _u, renewal process n), user k _uThe HS-SICH SIR predictive compensation amount δ of n subframe _SICH(k _u, n) equal user k _uThe up DPCH of n subframe measures SIRSIR _DPCH(k _u, n) deduct and be used for assisted user k _uThe SIR reference point SIR of the up DPCH of HS-SICH power control _{Ref_dpch}(k _u) and be used for assisted user k _uThe TPC accumulator CntTPC (k of HS-SICH power control _u) value, below the idiographic flow of step a will be described referring to Fig. 2:

If a1 UpdateFlag_ is δ _SICH(k _u, n)==1, then arrive a2, otherwise to a4;

If a2 imports SIR _DPCH(k _u, n) be not sky, then reference point SIR _{Ref_dpch}(k _u)=SIR _DPCH(k _u, n); Otherwise reference point SIR _{Ref_dpch}(k _u) be changed to sky;

A3 predictive compensation amount δ _SICH(k _u, n)=0; TPC accumulator CntTPC (k _u)=0; Finish.

If a4 reference point SIR _{Ref_dpch}(k _u) be empty, then arrive a5, otherwise to a7;

If a5 imports SIR _DPCH(k _u, be not empty n), SIR _{Ref_dpch}(k _u)=SIR _DPCH(k _u, n); Otherwise directly arrive a6;

A6 predictive compensation amount δ _SICH(k _u, n)=0; Finish.

A7 upgrades the TPC accumulator $\mathrm{CntTPC}\left(k_u\right)=\mathrm{CntTPC}\left(k_u\right)+{\mathrm{TPC}}_{\mathrm{UL}\_\mathrm{DPCH}}^{*}(k_u,n-I);$

If a8 is SIR _DPCH(k _u, be not empty n), then

Upgrade predictive compensation amount δ _SICH(k _u, n)=SIR _DPCH(k _u, n)-SIR _{Rf_dpch}(k _u)-CntTPC (k _u);

Otherwise keep predictive compensation amount δ _SICH(k _u, n)=δ _SICH(k _u, n-1); Finish.

Step b: the SIR renewal process of the auxiliary HS-SICH closed-loop power control of up DPCH information, if receive user k at current subframe n _uThe HS-SICH of n subframe measures SIRSIR _SICH(k _u, n), then be worth as HS-SICH and measure SIR reference point SIR with this _{Ref_sich}(k _u); Measure SIR if receive HS-SICH, surpassing preset time is that up DPCH assists the startup thresholding of HS-SICH closed-loop power control then to upgrade SIR with predicted value, promptly current SIRSIR _SICH(k _u, n) equal HS-SICH and measure SIR reference point SIR _{Ref_sich}(k _u) add among the step a predictive compensation amount δ that determines _SICH(k _u, n).

The idiographic flow of step b is described hereinafter with reference to Fig. 3.

If b1 imports SIR _SICH(k _u, be empty n), then arrive b2, otherwise to b4;

If b2 is T _SICH(k _u)＞L _DPCH, then

HS-SICH SIR predicts SIR _SICH(k _u, n)=SIR _{Ref_sich}(k _u)+δ _SICH(k _u, n);

Otherwise

HS-SICH SIR keeps SIR _SICH(k _u, n)=SIR _SICH(k _u, n-1);

B3 update mode judgement counter T _SICH(k _u)=T _SICH(k _u)+1; The HS-SICH updating mark that resets position UpdateFlag_ δ _SICH(k _u, n)=0; Finish.

B4 reference point SIR _{Ref_sich}(k _u)=SIR _SICH(k _u, n);

Reset mode judgement counter T _SICH(k _u)=0;

Set HS-SICH updating mark position UpdateFlag_ δ _SICH(k _u, n)=1; Finish.

Step c: the command word SIR forecasting process of HS-SICH constantly that comes into force.Sir value and HS-SICH power control equivalent command word according to the HS-SICH that determines among the step b determine that the n subframe is to n+1 subframe user k _uThe predicted value of up HS-SICH demodulation Signal to Interference plus Noise Ratio:

$\mathrm{SI}{R}_{\mathrm{ctrl}\_\mathrm{SICH}}(k_u,n)={\mathrm{SIR}}_{\mathrm{SIR}}(k_n,n)+\underset{i=1}{\overset{I-1}{\mathrm{\Σ}}}{\mathrm{TPC}}_{\mathrm{UL}}^{*}(k_u,n-i)\·P_{\mathrm{step}\_\mathrm{UL};}$

Steps d: power control commands word TPC _{UL_SICH}(k _u, n) and the equivalent command word TPC that uses of prediction algorithm _{UL_SICH} ^*(k _u, production process n).

${\mathrm{TPC}}_{\mathrm{UL}\_\mathrm{SICH}}\left(k_{u}n\right)=\left\{\begin{array}{c}11,{\mathrm{SIR}}_{\mathrm{ctrl}\_\mathrm{SICH}}(k_u,n)\&le;{\mathrm{SIR}}_{\mathrm{rgt}\_\mathrm{<figure-callout\; id="00"\; label="SICH"\; filenames="A20071009691700101.png"\; state="\{\{state\}\}">SICH</figure-callout>}}\\ 00,{\mathrm{SIR}}_{\mathrm{ctrl}\_\mathrm{SICH}}(k_u,n)>{\mathrm{SIR}}_{\mathrm{tgt}\_\mathrm{SICH}}\end{array}\right.$

Equivalent command word TPC _UL ^*Value by control command word TPC _ULDetermine that correlation is as follows:

${\mathrm{TPC}}_{\mathrm{UL}\_\mathrm{SICH}}^{*}(k_n,n)=\left\{\begin{array}{c}1,{\mathrm{TPC}}_{\mathrm{UL}\_\mathrm{SICH}}(k_u,n)=11\\ -1,{\mathrm{TPC}}_{\mathrm{UL}\_\mathrm{SICH}}(k_u,n)=00\end{array}\right.$

Step e: the power control commands word issues and the equivalent command tone of Chinese characters is had suffered journey.

If the n subframe has the HS-SCCH that is positioned at non-time slot 0 to be handed down to user k _u, in the HS-SCCH of n subframe, issue power control control word TPC _{UL_SICH}(k _u, n); Otherwise, carry out following operation:

If the n+1 subframe has the HS-SCCH that is positioned at time slot 0 to be handed down to user k _u, in the HS-SCCH of n+1 subframe, issue power control control word TPC _{UL_SICH}(k _u, n); Otherwise,

${\mathrm{TPC}}_{\mathrm{UL}\_\mathrm{SICH}}^{*}(k_u,n)=0.$

The above only be the preferable specific implementation of the present invention, but protection scope of the present invention is not limited to therewith; any people who is familiar with this technology; in the disclosed technical scope of the present invention, the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.

Claims (5)

1. the method for the HS-SICH closed power of high speed descending sharing channel control, it is characterized in that utilizing uplink special physical channel DPCH information to assist high speed descending sharing channel HS-SICH is the closed power control of up shared information channel, specifically comprises:

Because the HS-SICH channel quality of certain UE of the long initiation of scheduling interval can not get measuring the moment of renewal in the given time, add up the variable quantity of the up DPCH actual channel quality of this UE;

Deduction falls the adjustment variable effect of DPCH self transmitting power;

According to the variable quantity behind the described deduction adjustment variable effect channel quality of HS-SICH is made a prediction;

Produce the power adjustment that TPC power control commands word is used to control the follow-up HS-SICH of this UE according to described predicted value.

2. method as claimed in claim 2 is characterized in that, the adjustment variable effect that described deduction falls DPCH self transmitting power is meant that deduction falls the TPC power control commands word that is used to control up DPCH that the effective Node B of accumulative total issues.

3. the method for the HS-SICH closed power of high speed descending sharing channel control, in synchronous time division code division multiple access TD-SCDMA system, utilize uplink special physical channel DPCH information to assist the control of high speed descending sharing channel HS-SICH closed power, it is characterized in that may further comprise the steps:

1) if Node B receives new HS-SICH, then the sir measurement value according to this HS-SICH independently produces corresponding TPC command word, carries out subsequent power control, and execution in step 2); Can not get upgrading in the scope at the fixed time if the channel quality of HS-SICH is the sir measurement value, Node B just starts the auxiliary HS-SICH closed power control of up DPCH information, execution in step 3);

2) Node B with moment of newly receiving HS-SICH as the reference point, the measurement SIR of up DPCH puts SIR as reference with this moment, poor with the measurement SIR of up DPCH of follow-up arbitrary moment and this reference point SIR then, the adjustment of up DPCH transmitting power in deduction falls during this period of time again is with this SIR variable quantity prediction as distance reference point HS-SICH constantly;

3) in the auxiliary HS-SICH closed power control stage of up DPCH information, as long as the HS-SICH channel quality does not upgrade always, just with the last, it is the SIR variable quantity prediction that the sir measurement value of the HS-SICH of reference point adds the HS-SICH that step 2 obtains, obtain the SIR predicted value of current time HS-SICH, and produce corresponding TPC command word according to this HS-SICH SIR predicted value, carry out subsequent power control; If receive new HS-SICH, just return step 1) in this stage.

4. method as claimed in claim 3, it is characterized in that described step 2) described in deduction fall during this period of time in the adjustment of up DPCH transmitting power be meant deduction fall accumulative total during this period of time in the effective TPC power control commands word that is used to control up DPCH that issues of Node B.

5. method as claimed in claim 3 is characterized in that, described subsequent power control specifically comprises the equivalent command word that is identified for prediction algorithm according to the TPC power control commands word that produces, and TPC power control commands word is handed down to UE.

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