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.
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
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:
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).
Equivalent command word TPC
UL *Value by control command word TPC
ULDetermine that correlation is as follows:
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,
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.