CN100539459C - Channel power control method - Google Patents

Channel power control method Download PDF

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CN100539459C
CN100539459C CNB2006100783204A CN200610078320A CN100539459C CN 100539459 C CN100539459 C CN 100539459C CN B2006100783204 A CNB2006100783204 A CN B2006100783204A CN 200610078320 A CN200610078320 A CN 200610078320A CN 100539459 C CN100539459 C CN 100539459C
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rgch
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hich
threshold value
probability threshold
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CN1983849A (en
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张劲林
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XFusion Digital Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention discloses the control method that two kinds of High Speed Uplink Packet insert (HSUPA) down control channel power.A kind of method is to setover to determine this channel transmitting power by TPC transmitting power and the corresponding constant power of channel; Another kind method is according to the situation of ACK on the HICH channel HICH transmitting power to be adjusted, and further setovers to determine the RGCH transmitting power according to RGCH with respect to the constant power of HICH.By control method provided by the present invention, can effectively control the transmitting power of HSUPA down control channel RGCH and HICH, and can satisfy under user's demodulation requirement prerequisite, make transmitting power require to minimize.

Description

Channel power control method
Technical field
The present invention relates to wireless communication control method, be meant that especially High Speed Uplink Packet inserts the control method of (HSUPA) down control channel power.
Background technology
HSUPA is the up-high speed data service enhancement techniques in Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, and it adopts fast and retransmits, mixed automatic retransmission request (ARQ) reaches based on the distributed control method of base station and finishes transmitting uplink data function at a high speed.
System has distributed two control channels following each user of behavior: hybrid ARQ indicating channel (HICH) and relative authorization channel (RGCH) are used for transfer data packets confirmation and at user's control authorization message respectively.Wherein, carried affirmation information on the HICH, comprised affirmation (ACK), deny (NACK) and do not launch (DTX) three kinds up enhancing dedicated channel (E-DCH) data; The information of carrying on the RGCH comprises rising (RG_UP), descends (RG_DOWN) and does not launch (DTX) three kinds.The base station must rationally be provided with this two channel transmitting power, to guarantee the user demodulation error probability of these two channels is controlled under certain level.
In the prior art, the base station is generally the fixing power of every channel configuration, and the power of base station configuration must guarantee that the user of cell edge has enough good signal quality.Though this method implementation is simple, the problem of its existence is: total channel power consumption meeting is much larger than actual needs.
Summary of the invention
In view of this, the object of the present invention is to provide the control method of two kinds of HSUPA down control channel power, to control the transmitting power of HICH and RGCH better.
Technical scheme of the present invention is as follows:
First kind of channel power control method provided by the invention may further comprise the steps:
A1, according to the channel error demodulation probability threshold value that is provided with, draw the required signal to noise ratio of channel demodulation, wherein, described channel comprises mixed automatic retransmission request indicating channel HICH and relative authorization channel RGCH, when described channel is HICH, the channel error demodulation probability threshold value that described channel error demodulation probability threshold value is HICH, when described channel is RGCH, the channel error demodulation probability threshold value that described channel error demodulation probability threshold value is RGCH;
B1, according to power control commands word (TPC) the mistake demodulation probability threshold value that is provided with, draw the required signal to noise ratio of TPC demodulation;
Two signal to noise ratios that C1, calculation procedure A1 and step B1 draw poor is as the constant power biasing of channel with respect to TPC;
D1, TPC transmitting power and channel are set to channel emission power with respect to the constant power biasing sum of TPC.
Wherein, drawing the required signal to noise ratio of demodulation described in above-mentioned steps A1 or the step B1 is: draw or draw by emulation by Theoretical Calculation.
According to first kind of above-mentioned control method, the channel error demodulation probability threshold value of described HICH comprises: the last DTX false solution of HICH is adjusted to the probability threshold value of ACK and the probability threshold value that the ACK false solution is adjusted to DTX.
According to first kind of above-mentioned control method, the channel error demodulation probability threshold value of described RGCH comprises: the last DTX false solution of RGCH is adjusted to the probability threshold value that the probability threshold value of RG_UP or RG_DOWN and RG_UP or RG_DOWN false solution are adjusted to DTX.
The invention discloses the control method of two kinds of HSUPA down control channel power.A kind of method is to setover to determine this channel transmitting power by the transmitting power of power control commands word (TPC) and the corresponding constant power of channel; Another kind method is according to the situation of ACK on the HICH channel HICH transmitting power to be adjusted, and further setovers to determine the RGCH transmitting power according to RGCH with respect to the constant power of HICH.By control method provided by the present invention, can effectively control the transmitting power of HSUPA down control channel RGCH and HICH, and can satisfy under user's demodulation requirement prerequisite, make transmitting power require to minimize.
Description of drawings
Fig. 1 is for determining the embodiment schematic diagram of HICH transmitting power according to first kind of control method provided by the invention;
Fig. 2 is for determining the embodiment schematic diagram of RGCH transmitting power according to first kind of control method provided by the invention;
Fig. 3 is for determining the first embodiment schematic diagram of HICH and RGCH transmitting power according to second kind of control method provided by the invention;
Fig. 4 is for determining the second embodiment schematic diagram of HICH and RGCH transmitting power according to second kind of control method provided by the invention.
Embodiment
For making 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.
In order to finish to the control of the fast power of user uplink channel, there is the base station that is connected all can be with the user periodically at TPC of downlink, the transmitting power of TPC is to be determined by the power of Dedicated Physical Data Channel (DPDCH) and power bias.Because the descending TPC of each base station is inequality, so the user can not receive with high specific merging method.The power bias of TPC is by radio network controller (RNC) control in the WCDMA system, and RNC can adjust the power bias of TPC to remedy TPC and the difference of DPDCH on power demand that the soft changing state change brings in real time according to the user radio connection status.Similar with the situation of TPC, the information of carrying on HICH and the RGCH on each base station also is different, and the transmitting power of the two also can be provided with according to DPDCH power and corresponding power bias.Like this, the transmitting power of HICH and RGCH just can be provided with in real time according to TPC power and corresponding power bias, to adapt to the change of soft changing state.
Determine the method for HICH or RGCH channel emission power for above-mentioned according to TPC transmitting power and corresponding power bias, power wherein and power bias all are unit with dB.Like this, in fact the TPC transmitting power is added corresponding power offset of channel, just can determine channel emission power.
In first kind of control method of HSUPA down control channel power provided by the invention, setover to determine the transmitting power of HICH, RGCH by TPC transmitting power and precalculated constant power.When the user radio linking number changed, the TPC transmitting power also changed thereupon, at this moment, can setover with respect to the constant power of TPC according to HICH and RGCH, came to determine and adjust respectively the transmitting power of HICH and RGCH, with real-time adaptation network state.
Fig. 1 is for determining the embodiment schematic diagram of HICH transmitting power according to first kind of control method provided by the invention, concrete steps are as follows:
Step 110, the wrong demodulation probability threshold value according to HICH is provided with calculates the required signal to noise ratio SIR of HICH demodulation HICHHere, described wrong demodulation probability threshold value is meant that the DTX false solution that sets in advance is adjusted to the probability threshold value of ACK and the probability threshold value that the ACK false solution is adjusted to DTX.This step can adopt Theoretical Calculation or method of emulation to realize.Specific as follows:
Suppose to disturb to be white Gauss noise, then the user with the probability that the DTX false solution is adjusted to ACK is:
P f = ∫ TN 0 ∞ 1 π N 0 e - r 2 / N 0 dr = 1 2 π ∫ 2 T ∞ e - x 2 / 2 dx = Q ( 2 T HICH ) - - - ( 1 )
Wherein, Q = 1 2 π ∫ x ∞ e - t 2 / 2 dt , T HICHBe demodulation threshold.Therefore, according to preset user the DTX false solution is adjusted to the probability P of ACK fThreshold value, can calculate the demodulation threshold T that the user should use HICH
Under given SIR and demodulation threshold T, the user with the probability that the ACK false solution is adjusted to DTX is:
P f = Q ( 2 ( SIR HICH G HICH ) - 2 T HICH ) - - - ( 2 )
G wherein HICHSpreading gain for the HICH symbol.Then can calculate the required signal to noise ratio SIR of HICH demodulation by following formula HICH
Step 120, the wrong demodulation probability threshold value according to TPC is set in advance calculates the required signal to noise ratio SIR of TPC demodulation TPCThis step can adopt Theoretical Calculation or method of emulation to realize equally, and the method in concrete computational methods and the step 110 is similar, and then the wrong demodulation probability calculation formula of TPC is:
P f = Q ( 2 ( SIR TPC G TPC ) ) - - - ( 3 )
G wherein TPCSpreading gain for the TPC symbol.Can calculate the required signal to noise ratio SIR of TPC demodulation by following formula TPC
Step 130, HICH is with respect to the constant power biasing BIAS of TPC transmitting power HICH, poor for two signal to noise ratios calculating respectively in step 110 and the step 120, that is:
BIAS HICH＝SIR HICH-SIR TPC (4)
Wherein, in the above-mentioned formula (4), BIAS HICH, SIR HICHAnd SIR TPCUnit be dB.
Step 140 is by TPC transmitting power and HICH constant power biasing BIAS HICH, determine the transmitting power of HICH.
Fig. 2 is for determining the embodiment schematic diagram of RGCH transmitting power according to first kind of control method provided by the invention, the method for concrete computational methods and definite HICH transmitting power as shown in Figure 1 is similar, and concrete steps are as follows:
Step 210, the wrong demodulation probability threshold value according to RGCH is provided with calculates the needed signal to noise ratio SIR of RGCH demodulation RGCHHere, described wrong demodulation probability threshold value is meant that the DTX false solution that sets in advance is adjusted to the probability threshold value that the probability threshold value of RG_UP or RG_DOWN and RG_UP or RG_DOWN false solution are adjusted to DTX.This step can adopt Theoretical Calculation or method of emulation to realize.Specific as follows:
Suppose to disturb is white Gauss noise, the above-mentioned wrong demodulation probability threshold value that sets in advance, be meant that the DTX false solution that sets in advance is adjusted to the probability threshold value of RG_UP and the probability threshold value that the RG_UP false solution is adjusted to DTX, then the user with the probability that the DTX false solution is adjusted to RG_UP is:
P f = ∫ TN 0 ∞ 1 π N 0 e - r 2 / N 0 dr = 1 2 π ∫ 2 T ∞ e - x 2 / 2 dx = Q ( 2 T RGCH ) - - - ( 5 )
Wherein, Q = 1 2 π ∫ x ∞ e - t 2 / 2 dt , T RGCHBe demodulation threshold.Therefore, according to preset user the DTX false solution is adjusted to the probability P of RG_UP fThreshold value, can calculate the demodulation threshold T that the user should use RGCH
Under given SIR and demodulation threshold T, the user with the probability that the RG_UP false solution is adjusted to DTX is:
P f = Q ( 2 ( SIR RGCH G RGCH ) - 2 T RGCH ) - - - ( 6 )
G wherein RGCHSpreading gain for the RGCH symbol.Then can calculate the required signal to noise ratio SIR of RGCH demodulation by following formula RGCH
Step 220, the wrong demodulation probability threshold value according to TPC is set in advance calculates the required signal to noise ratio SIR of TPC demodulation TPCThis step can adopt Theoretical Calculation or method of emulation to realize equally.By the identical method shown in step 120 among Fig. 1, draw the required signal to noise ratio SIR of TPC demodulation TPC
Step 230, RGCH is with respect to the constant power biasing BIAS of TPC transmitting power RGCH, poor for two signal to noise ratios calculating respectively in step 210 and the step 220, that is:
BIAS RGCH＝SIR RGCH-SIR TPC (7)
Wherein, in the above-mentioned formula (7), BIAS RGCH, SIR RGCHAnd SIR TPCUnit be dB.
Step 240 is by TPC transmitting power and RGCH constant power biasing BIAS RGCH, determine the transmitting power of RGCH.
This shows, adopt first kind of channel power control method provided by the invention, the transmitting power of HICH can be by TPC transmitting power and HICH constant power biasing BIAS HICHDetermine, as shown in Figure 1; And the RGCH transmitting power can be by TPC transmitting power and RGCH constant power biasing BIAS RGCHDetermine, as shown in Figure 2.If but that the TPC transmitting power is provided with itself is inaccurate, will influence the transmitting power setting of HICH, RGCH.
Therefore, the present invention also provides second kind of channel power control method, this is the method that a kind of base station self adaptation is adjusted HICH, RGCH transmitting power, according to HICH is gone up the statistical analysis that the ACK mistake receives number, adjust the transmitting power of HICH in real time, can make system that the transmitting power of HICH, RGCH is set more accurately.
Fig. 3 is for determining the first embodiment schematic diagram of HICH and RGCH transmitting power according to second kind of control method provided by the invention, concrete steps are as follows:
Step 310, when a confirmation ACK is being launched in the base station on the HICH after, check the packet state that the next corresponding moment receives at up E-DCH: if this packet was the retransmission data packet may in a last moment, judge that then this ACK is received by user error, count the wrong number that receives; Otherwise judge it is the correct ACK that receives of user, be not counted in the wrong number that receives.
Step 320, cycle statistics ACK mistake receives number and total number that sends.
Step 330, calculating ACK mistake receives the number estimated probability and is: mistake reception number/always send number, and the mistake that will calculate receives estimated probability and set ACK mistake probability of acceptance threshold value E rCompare.
Whether step 340, misjudgment receive estimated probability greater than ACK mistake probability of acceptance threshold value E rIf, greater than E r, then execution in step 340A promptly raises the HICH transmitting power; If less than E r, then execution in step 340B promptly reduces the HICH transmitting power.Wherein, the last tone pitch of HICH transmitting power or following tone pitch can be one or more step-lengths, and the value that raises and reduce can be the same or different.
Step 350 is adjusted to the probability threshold value of ACK and the probability threshold value that the ACK false solution is adjusted to DTX according to the DTX false solution that HICH is provided with, and calculates the required signal to noise ratio SIR of HICH demodulation HICH
Step 360 is adjusted to the probability threshold value that the probability threshold value of RG_UP or RG_DOWN and RG_UP or RG_DOWN false solution are adjusted to DTX according to the DTX false solution that RGCH is provided with, and calculates the needed signal to noise ratio SIR of RGCH demodulation RGCH
Step 370, RGCH is with respect to the constant power biasing BIAS of HICH RGCH, poor for two signal to noise ratios calculating respectively in step 331 and the step 332, that is:
BIAS RGCH＝SIR RGCH-SIR HICH (8)
Wherein, in the above-mentioned formula (8), BIAS RGCH, SIR RGCHAnd SIR HICHUnit be dB.
Step 380 is by HICH transmitting power and RGCH constant power biasing BIAS RGCHDetermine the RGCH transmitting power.
Shown in the step 310 among Fig. 3,320,330,340, system cycle statistics and calculate the probability that the ACK mistake receives number, and with ACK mistake probability of acceptance threshold value E rCompare, the HICH transmitting power is carried out the dynamic self-adapting adjustment, shown in step 340A or 340B among Fig. 3 with this.In step 350 after this, 360,370, adopted with as shown in Figures 1 and 2 first method provided by the invention in similar computational methods, calculate the constant power biasing BIAS of RGCH with respect to HICH RGCH, shown in above-mentioned formula (8), and in step 380 according to HICH transmitting power and BIAS RGCHFurther adjust the transmitting power of RGCH in real time.
Fig. 4 is for determining the second embodiment schematic diagram of HICH and RGCH transmitting power according to second kind of control method provided by the invention, present embodiment has been taked and different self-adapting regulation method embodiment illustrated in fig. 3, and concrete steps are as follows:
Step 410, when a confirmation ACK is being launched in the base station on the HICH after, check the packet state that the next corresponding moment receives at up E-DCH:, judge that then this ACK is received by user error if this packet was the retransmission data packet may in a last moment; Otherwise judge it is the correct ACK that receives of user.
Step 420, whether the ACK described in the determining step 430 is the ACK that user error receives, if the ACK that user error receives, then execution in step 420A is about to the HICH transmitting power and raises a step-length P UPOtherwise execution in step 420B is about to step-length P of HICH transmitting power downward modulation DOWNWherein, the rise step-length P of HICH transmitting power UP, downward modulation step-length P DOWNWith default ACK mistake probability of acceptance threshold value E rBetween, satisfy following relation:
E rP UP＝(1-E r)P DOWN (9)
Step 430 is adjusted to the probability threshold value of ACK and the probability threshold value that the ACK false solution is adjusted to DTX according to the DTX false solution that HICH is provided with, and calculates the required signal to noise ratio SIR of HICH demodulation HICH
Step 440 is adjusted to the probability threshold value that the probability threshold value of RG_UP or RG_DOWN and RG_UP or RG_DOWN false solution are adjusted to DTX according to the DTX false solution that RGCH is provided with, and calculates the needed signal to noise ratio SIR of RGCH demodulation RGCH
Step 450, RGCH is with respect to the constant power biasing BIAS of HICH RGCH, poor for two signal to noise ratios calculating respectively in step 431 and the step 432, that is:
BIAS RGCH＝SIR RGCH-SIR HICH
Step 460 is by HICH transmitting power and RGCH constant power biasing BIAS RGCHDetermine the RGCH transmitting power.
In second embodiment of as shown in Figure 4 second method provided by the invention, system is according to the packet status detection to receiving, judge whether ACK information is the ACK that user error is received, and whether respectively the HICH transmitting power is taked different dynamic adjustment strategies according to the mistake of this ACK information.In step 430 after this, 440,450, also adopted with as shown in Figures 1 and 2 first method provided by the invention in similar computational methods, calculate the constant power biasing BIAS of RGCH with respect to HICH RGCH, as the aforementioned shown in the formula (8), and in step 460 according to HICH transmitting power and BIAS RGCHFurther adjust the transmitting power of RGCH in real time.
In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims (4)

1, a kind of High Speed Uplink Packet inserts the control method of (HSUPA) down control channel power, it is characterized in that this method may further comprise the steps:
A1, according to the channel error demodulation probability threshold value that is provided with, draw the required signal to noise ratio of channel demodulation, wherein, described channel comprises mixed automatic retransmission request indicating channel (HICH) and relative authorization channel (RGCH), when described channel is HICH, the channel error demodulation probability threshold value that described channel error demodulation probability threshold value is HICH, when described channel is RGCH, the channel error demodulation probability threshold value that described channel error demodulation probability threshold value is RGCH;
B1, according to power control commands word (TPC) the mistake demodulation probability threshold value that is provided with, draw the required signal to noise ratio of TPC demodulation;
Two signal to noise ratios that C1, calculation procedure A1 and step B1 draw poor is as the constant power biasing of channel with respect to TPC;
D1, TPC transmitting power and channel are set to channel emission power with respect to the constant power biasing sum of TPC.
2, control method as claimed in claim 1, it is characterized in that the channel error demodulation probability threshold value of described HICH comprises: do not launch information (DTX) false solution on the HICH and be adjusted to the probability threshold value of confirmation (ACK) and the probability threshold value that the ACK false solution is adjusted to DTX.
3, control method as claimed in claim 1, it is characterized in that the channel error demodulation probability threshold value of described RGCH comprises: the last DTX false solution of RGCH is adjusted to the probability threshold value that the probability threshold value of RGCH rising information (RG_UP) or RGCH decline information (RG_DOWN) and RG_UP or RG_DOWN false solution are adjusted to DTX.
4, control method as claimed in claim 1 is characterized in that, draws the required signal to noise ratio of demodulation described in steps A 1 or the step B1 to be: draw or draw by emulation by Theoretical Calculation.
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