CN1681221A - Power controlling method in base station - Google Patents
Power controlling method in base station Download PDFInfo
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- CN1681221A CN1681221A CN 200410030853 CN200410030853A CN1681221A CN 1681221 A CN1681221 A CN 1681221A CN 200410030853 CN200410030853 CN 200410030853 CN 200410030853 A CN200410030853 A CN 200410030853A CN 1681221 A CN1681221 A CN 1681221A
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Abstract
The method includes following steps: 1) with the evaluation result for down stream reception quality, user terminal creates TPC instruction that is sent to base station; 2) the base station demodulates the down stream TPC instruction, and gets the regulation for the down stream transmitting power. The user terminal creates up stream TPC instruction and up stream reception quality index according to evaluating result for up stream reception quality, and generates a down stream power regulation according to up stream reception quality index, and adjusts the down stream transmitting power of base station by using down stream transmitting power regulation and the down stream TPC instruction; 3) the base station transmits the TPC instruction to user terminal that adjusts up stream transmitting power according to the up stream TPC instruction.
Description
Technical field
The present invention relates to power control techniques, relate in particular to the method for carrying out power control in a kind of base station.
Background technology
Along with the rise of third generation communication network technique, Wideband Code Division Multiple Access (WCDMA) (WCDMA) technology is also in development constantly.Poewr control method is one of physical layer core technology of WCDMA, and it can overcome near-far interference effectively, makes that CDMA technology is moved towards to use; And soft handover also is one of major function of cdma system, and it had both realized the free of discontinuities switching, brings system gain simultaneously.
Current 3G standard is formulated tissue (3GPP) and is disclosed a kind of 3GPP agreement in " 3GPP TS 25.214 530 Physical LayerProcedures (FDD) (Release 5) ", and this agreement discloses a kind of WCDMA base station system Poewr control method.As shown in Figure 1, in wireless network, a user terminal (UE) can connect a plurality of Radio Links (RL), for example, RL1 and RL2, every RL is corresponding to a sub-district and a group network side transmitter and receiver, and the network side of every RL is a base station system.In this method, each RLUE side and network side are measured the quality of reception in real time also by physical layer transmitting power control (TPC) the order reduction of feedback or the power of rising transmitter, so that the quality of reception maintains the level of requirement.
This method comprises up inner-loop power control system process and descending inner-loop power control process, described up finger from the UE side to network side, described down behavior (UE) side from the network side to the user terminal.Wherein up inner-loop power control process comprises shown in the dotted arrow among Fig. 1:
A1, UE side transmitter send ascending idle port information 101 to the network side receiver of each Radio Link (RL);
A2, each RL network side receiver are assessed up signal interference ratio (SIR), being about to the signal actual reception quality compares with the predefined standard target quality of reception, if the up quality of reception, then generates the up TPC order that reduces uplink transmission power than target quality of reception height; If the up quality of reception is lower than the target quality of reception, then generate the up TPC order that improves uplink transmission power.And the up TPC order that will generate sends to the network side transmitter of this RL.
A3, each RL network side transmitter send downlink space interface information 102 to UE side receiver, comprising the up TPC order and the data flow of eating dishes without rice or wine;
A4, UE side receiver receive downlink space interface information 102, and judge whether keep up TPC order in this RL downlink space interface information 102 according to the descending quality of reception of every RL, if the descending quality of reception of this RL is lower than quality of reception minimum threshold, then ignore the up TPC order in this RL downlink space interface information 102, otherwise, keep the up TPC order in this RL downlink space interface information 102.Then, up TPC order in each RL downlink space interface information 102 that the demodulation of UE side receiver keeps, and to every up TPC order carrying out judgement of lifting power, if the up TPC order of every RL all requires to improve uplink transmission power, then merge and generate a up TPC order that requires to improve uplink transmission power, otherwise, generate a TPC who reduces uplink transmission power and order.
A5, UE side transmitter are adjusted uplink transmission power according to the up TPC order that receives.
Wherein descending inner loop power control specifically comprises shown in the solid line among Fig. 1:
The network side transmitter of b1, each RL sends downlink space interface information 102 to UE side receiver, comprises downlink space interface data and descending TPC order;
B2, UE side receiver are assessed the descending SIR of each RL, and the descending SIR that utilizes each RL is weighted merging to the downlink space interface data of each RL, the result that this weighting merges has reflected that mainly SIR is the highest, it is the data cases of the best RL of the quality of reception, therefore UE side receiver merges the descending TPC order that generates the best RL downlink power control demand of a main reflection quality of reception, and the descending TPC order that will generate sends to UE side transmitter;
The descending TPC order that b3, UE side transmitter will receive is forwarded to each receiver of network side;
B4, the descending TPC of each RL network side receiver demodulation order, and this descending TPC order are sent to the transmitter of this RL correspondence;
B5, each RL transmitter of network side are adjusted down transmitting power according to the descending TPC order that receives.
The method of 3GPP has two kinds of patterns to carry out downlink power control, is respectively downlink power control pattern 0 and downlink power control pattern 1.For downlink power control pattern 0, each time slot of network side transmitter is adjusted a down transmitting power; For downlink power control pattern 1, per three time slots of network side transmitter are adjusted a down transmitting power.The network side transmitter is adjusted down transmitting power according to following formula (1):
P(k)＝P(k-1)+Ptpc(k)+Pbal(k) (1)
Wherein: P (k) is the down transmitting power of k time slot, and Ptpc (k) is the power control adjustment amount that the descending TPC of k time slot requires, and Pbal (k) is the power adjustment of k time slot utilizing the download power balancing algorithm computation and obtain.Described Ptpc (k) obtains according to following formula (2):
In the formula (2), TPCdl (k) is the power control index that k time slot TPC requires, and power is heightened in " 1 " expression, and power is turned down in " 0 " expression.Δ
TPCBe the power control step-length, the adjustment amount of expression power.In the 3GPP agreement, stipulated the value of four power control step-lengths, one of them value is the power control step-length of a unit, value is 0.5dB, other three values are the integral multiple of this unit power control step-length, when concrete the application, can choose the adjustment amount of a value as power control as the case may be wantonly.Power control step-length value herein is unit, i.e. a 0.5dB.+ Δ
TPCThe power of a unit power control step-length of expression rising ,-Δ
TPCExpression reduces the power of a unit power control step-length, and described power control step-length is the variable that can set.
Described Pbal (k) obtains according to following formula (3):
∑P
bal＝(1-r)(P
ref+P
P-CPICH-P
init) (3)
In the formula (3), ∑ P
BalBe total adjustment amount of the download power balancing algorithm in the adjustment cycle, wherein P
RefBe reference power amount of bias, P
P-CPICHBe the pilot power amount of bias of this sub-district, P
InitBe the down transmitting power of last time slot in the last power adjustment cycle of current RL, r is an adjustment rate.According to above-mentioned ∑ P
Bal, and relevant parameter, network side can calculate the adjustment amount Pbal (k) of each time slot in the adjustment cycle.
Said method is a kind of more direct processing procedure, do not have the crosspoint between up as can be seen from Figure 1 inner-loop power control loop and the descending inner-loop power control loop, so the up-downgoing inner-loop power control is separately independently.Up inner-loop power control is only considered the up quality of reception, and descending inner-loop power control is only considered the descending quality of reception.
Said method is under the situation of wall scroll RL, be under the situation of UE in a sub-district, because network side has only one group of transmitter and receiver, transmit leg can in time respond recipient's feedback TPC order, thereby adjust transmitted power apace, the convergence of inner loop power control is to meet the requirements of very easily.
But, under the state of soft handover, there are many RL the switch area, be that the switch area has a plurality of sub-districts, network side has many group transmitter and receivers, UE and network side keep many RL simultaneously, for up inner-loop power control, the up TPC that UE will take into account each RL orders the ascending power of adjusting UE, therefore all reach under the situation of reliable request in the descending quality of reception be rational to this method, yet because the existence of switch area rapid fading, the descending coupling loss of each RL has bigger deviation, to such an extent as to wherein the descending quality of reception of some RL is unreliable, its up TPC order is left in the basket, therefore cause the up TPC order of this RL in time not responded, cause the inner-loop power control of this RL not restrain.Not restraining of this inner-loop power control caused following defective:
Suppose that UE keeps two wireless links RL1 and RL2 in the switch area.If in certain position, the up quality of reception of RL1 is littler than the up coupling loss of RL2, but its descending coupling loss is bigger than the descending coupling loss of RL2, the descending coupling loss of then working as RL1 and RL2 differs and acquires a certain degree, the descending quality of reception of RL1 reaches UE terminal " reliably " when decision threshold is following, the up TPC order of RL1 is considered to unreliable and is left in the basket, therefore, UE side uplink transmission power will be ordered according to the TPC of the high RL2 of the up quality of reception and be adjusted, thereby can cause the up quality of reception of RL1 to surpass the value that requires, the waste ascending power.This situation is called as " up-downgoing coupling loss imbalance between soft switching link ".In addition, this method does not all have " reliably " required to stipulate up at present, causes understanding differently of different business terminals to cause, thereby whether reliably the various UE in the switch area judge quality of reception mode difference.
Remove the situation of above-mentioned " up-downgoing coupling loss imbalance between soft switching link ", situation for " up-downgoing coupling loss balance between soft switching link ": for example, suppose that UE keeps two wireless links RL1 and RL2 in the switch area, if in certain position, the up coupling loss of RL1 is littler than the up coupling loss of RL2, the descending coupling loss also descending coupling loss than RL2 is little, so the inner-loop power control of uplink and downlink all is converged on the RL1.The down transmitting power of RL1 plays a leading role, and the down transmitting power of RL2 is on the low side, and little to the contribution of the UE quality of reception, but UE also will consume this share external power, promptly a UE has consumed surplus power, thereby has increased the interference to other UE, promptly descending interference.Therefore in this case, network holds the quantity of UE when being in many cell scenario, compares when promptly downlink capacity is with single cell scenario and can significantly decrease; Simultaneously, because the ascending power of RL2 also has interference to other user uplink power of other each sub-districts, therefore the up-link capacity of network also decreases, but because UE has only a transmitter to send ascending idle port information 101, descend though compare to some extent when therefore the up-link capacity of network is with single cell scenario when many cell scenario, but descend to such an extent that lack than the downlink capacity of network.But actual conditions are: in 3G network, the downlink space interface amount of information contains much information than ascending idle port, and for example, the users from networks side is downloaded lot of data, and the data of uploading are fewer, so the demand of the mechanism of above-mentioned 3GPP method and reality is a contradiction.
Except the method for above-mentioned 3GPP, current also have a kind of cell selecting transmit diversity power to control (SSDT, Site Selection Diversity Transmition Power Control) method, this method is that network system is in a kind of emission diversity method under the soft changing state, its operating process is: for UE keeps an Active Set, this Active Set is used to store the effective sub-district of signal in this switch area, UE chooses the main plot of a sub-district as it from Active Set, other be non-main plot.When UE is in the switch area, have only the main plot emission information of eating dishes without rice or wine, but not the main plot stops the emission information of eating dishes without rice or wine, and reaches the purpose that reduces descending interference thus.In addition, this method is switched fast by physical layer signaling, thereby reduces the high level intervention of base station.In order to realize the differentiation of main plot and non-main plot, this SSDT method need be safeguarded an interim sign for the every wireless links in the Active Set, UE notifies by the temporary sign of specifying the main plot link and distinguishes the main plot, it is the main plot that UE comes that sub-district of informing network side by feedback information (FBI, the Feedback Information) territory in the ascending physical signal frame format.
The shortcoming of above-mentioned SSDT method is to implement complexity, needs network side and UE side to safeguard the temporary sign of each sub-district in the Active Set, and needs UE subsidiary main plot, is the main plot by which sub-district of up link FBI informing network side then.In addition, this method only could be used under the situation that the common signal channel (P-CPICH, Primary Common Pilot Chanel) of WCDMA is used, so its restriction is also many, can not use in any occasion; Simultaneously, because UE measures mistake or FBI transmission error also may cause network side not use real main plot, thereby influence the stability of link power control.
Summary of the invention
In view of this, main purpose of the present invention provides a kind of inner loop power control method, when making UE be in soft handover area, saves power, improves system's up-downgoing capacity.
To achieve these goals, technical scheme of the present invention specifically is achieved in that
The method of power control in a kind of base station, this method comprises:
A1, user terminal are assessed the descending quality of reception, generate down transmitting power control TPC order according to assessment result, and should descending TPC order send to the base station;
A2, the described descending TPC order of base station demodulation, obtain the down transmitting power adjustment amount of this descending TPC order, and the up quality of reception assessed, generate up TPC order and up quality of reception index, generate capable transmitting power adjustment amount according to up quality of reception index again, and utilize this to adjust base station down transmitting power by the down transmitting power adjustment amount of up quality of reception generation and the down transmitting power adjustment amount of described descending TPC order;
A3, base station send to user terminal with described up TPC order, and user terminal is resolved this up TPC order, obtain the uplink transmission power adjustment amount of this up TPC order, according to this power adjustment uplink transmission power are adjusted.
Generating according to up quality of reception index described in the step a2, the process of capable transmitting power adjustment amount comprises:
Judge the convergence of the up quality of reception according to up quality of reception index, if up quality of reception index superelevation, then generates an adjustment amount of heightening down transmitting power in a predefined superelevation thresholding; If up quality of reception index is ultralow in a predefined ultralow thresholding, then generate the adjustment amount of a reduction down transmitting power, otherwise, generate a zero energy adjustment amount.
The process that generates a descending transmitting power adjustment amount according to the up quality of reception described in the step a2 comprises:
B1, the described up quality of reception index of record, and the up quality of reception index in the stipulated time carried out level and smooth filtration treatment, obtain the accumulation amount of level and smooth up quality of reception index in this stipulated time;
B2, judge the convergence of the up quality of reception according to the accumulation amount of described level and smooth up quality of reception index, the thresholding if the predefined superelevation that is higher than the accumulation amount of described level and smooth up quality of reception index adds up then generates the adjustment request of a rising down transmitting power; If the accumulation amount of described level and smooth up quality of reception index is lower than the ultralow thresholding that adds up that sets, then generate an adjustment request that reduces down transmitting power; Otherwise, then generate an adjustment request of not adjusting down transmitting power;
B3, the down transmitting power adjustment request that generates suddenly according to previous step generate a descending transmitting power adjustment amount.
Further comprise after the described step b3:
C1, record described down transmitting power adjustment request and down transmitting power adjustment amount, and the down transmitting power adjustment amount in the stipulated time carried out level and smooth filtration treatment, obtain the accumulation amount of level and smooth down transmitting power adjustment amount in this stipulated time;
C2, in adjusting the scope of power, judge the state of current adjustment request and described level and smooth down transmitting power adjustment amount: if the adjustment request of current time slots is the rising down transmitting power, and the accumulation amount of level and smooth down transmitting power adjustment amount is lower than the maximum of predefined rising power in the described stipulated time, then generates the down transmitting power adjustment amount of the certain power control step-length of a rising; If the adjustment request of current time slots is for reducing down transmitting power, and the accumulation amount of level and smooth down transmitting power adjustment amount is higher than the maximum of predefined reduction power in the described stipulated time, then generates the down transmitting power adjustment amount of the certain power control step-length of a reduction; Otherwise, then generate a subzero capable transmitting power adjustment amount.
The method of described adjustment base station down transmitting power is:
Obtain the down transmitting power adjustment amount that obtains by the download power balancing algorithm and the down transmitting power of a last time slot, the down transmitting power adjustment amount that obtains with the down transmitting power adjustment amount of described descending TPC order, the described down transmitting power adjustment amount that generates according to up quality of reception index, by the download power balancing algorithm and the down transmitting power addition of a last time slot, obtain the down transmitting power of current time slots, adjust base station down transmitting power according to this down transmitting power.
Preestablish an associating inner loop power control algolithm switch, in described step a2, generate after up TPC order and the up quality of reception index, further comprise:
Judge the state of described associating inner loop power control algolithm switch, if this switch is in out state, then generate capable transmitting power adjustment amount, and utilize this to adjust base station down transmitting power by the down transmitting power adjustment amount of up quality of reception generation and the down transmitting power adjustment amount of described descending TPC order according to up quality of reception index; Otherwise, utilize the down transmitting power adjustment amount of described descending TPC order to adjust base station down transmitting power.
Execution in step a1 is to step a3 in the power control process of each time slot; Perhaps, only the regulation time slot power control process in execution in step a1 to step a3.
The value of the described down transmitting power adjustment amount that generates according to up quality of reception index is the integral multiple of unit power control step-length.
Described up quality of reception index is: the assessed value of the assessed value of up signal interference ratio, up TPC command word or up signal interference ratio and the desired value of up signal interference ratio poor.
Because it is easy that method of the present invention based on the 3GPP agreement, realizes, the inner loop power control performance when therefore not influencing single-link substantially.Again because this method is heightened down transmitting power when up quality of reception superelevation, thereby up received power waste problem appears in the switch area of having brought when having solved up-downgoing coupling loss non-equilibrium state between soft handover branches effectively, thereby improved up handoff gain, and make that the soft handover area ratio is big more, the user in the soft handover area is many more, the power of saving is many more, and up handoff gain is high more.The difference of the descending rapid fading of each RL when having eliminated simultaneously up-downgoing coupling loss non-equilibrium state between soft handover branches effectively, thus make the RL of switch area connect more stable; Because this method reduces down transmitting power when the up quality of reception is ultralow, thereby between soft handover branches, realized only by the strongest descending sub-district transmission information, so improved the up-downgoing capacity of base station system during up-downgoing coupling loss poised state.
In addition, method of the present invention is only made amendment to the flow process of each base station of prior art network side, and does not revise the flow process of user terminal, do not need transmission information between the different base station yet, therefore, the present invention can compatible existing various user terminals, and can cross over different base stations.
Description of drawings
Fig. 1 is the inner-loop power control loop schematic diagram of 3GPP method described in the prior art;
Fig. 2 is the inner-loop power control loop schematic diagram of the method for the invention;
Fig. 3 is a kind of flow chart of descending inner-loop power control of the present invention;
Fig. 4 is a kind of realization block diagram of down transmitting power being controlled at the network side transmitter of the present invention.
Embodiment
Further specify implementation method of the present invention below in conjunction with the drawings and specific embodiments.
Core concept of the present invention is: when network side carries out descending inner-loop power control, according to the descending quality of reception and the up quality of reception down transmitting power is regulated and control simultaneously, the inner-loop power control loop of two separate operations is joined together mutually at network side.Therefore method of the present invention is called " associating inner loop power control method " (UILPC, United Inner Loop Power Control).
" associating inner loop power control method " of the present invention can be used for the power control of third generation communication network base station, be particularly useful for the power control in WCDMA frequency-duplex (FDD) system and the CDMA FDD system, therefore following is example with the Poewr control method in the WCDMA FDD system, and method of the present invention is described.
As shown in Figure 2, the method of the invention comprises up inner-loop power control process and descending inner-loop power control process, wherein up inner-loop power control process is shown in the dotted arrow among Fig. 2, and this process is identical with up inner-loop power control process in the 3GPP agreement of the prior art, promptly comprises in each time slot:
A1, UE side transmitter send ascending idle port information 101 to the network side receiver of each RL;
A2, each RL network side receiver are assessed up SIR, if the up quality of reception is than target quality of reception height then generate the up TPC order that is used to reduce uplink transmission power, if the up quality of reception is lower then generate the up TPC that is used to improve uplink transmission power and order than the target quality of reception.And the up TPC order that will generate sends to the network side transmitter of this RL;
A3, each RL network side transmitter send downlink space interface information 102 to UE side receiver, comprising the up TPC order and the data flow of eating dishes without rice or wine;
A4, UE side receiver receive downlink space interface information 102, and judge whether keep up TPC order in this RL downlink space interface information 102 according to the descending quality of reception of every RL, if the descending quality of reception of this RL is lower than quality of reception minimum threshold, then ignore the up TPC order in this RL downlink space interface information 102, otherwise, keep the up TPC order in this RL downlink space interface information 102.Then, up TPC order in each RL downlink space interface information 102 that the demodulation of UE side receiver keeps, and to every up TPC order carrying out judgement of lifting power, if the up TPC order of every RL all requires to improve uplink transmission power, then merge and generate a up TPC order that requires to improve uplink transmission power, otherwise, generate a TPC who reduces uplink transmission power and order;
A5, UE side transmitter are according to the up TPC order control uplink transmission power that receives.
The descending inner-loop power control process of the method for the invention is shown in solid arrow among Fig. 2, and this descending inner-loop power control process is improved the descending inner-loop power control process in the 3GPP agreement.As shown in Figure 3, its specific implementation method is to comprise in each time slot:
The up quality of reception index of step 305, record current time slots, and the up quality of reception index in the stipulated time carried out level and smooth filtration treatment, to change express up quality of reception index and filter out, obtain the accumulation amount of one group of level and smooth quality of reception index.The mode that realizes this level and smooth filtration treatment is many, for example can use a filter that up quality of reception index is handled.
Step 306, judge the convergence of the up quality of reception according to described up quality of reception index, promptly in official hour, if described level and smooth up quality of reception index is higher than the predefined superelevation thresholding that adds up, illustrate that up quality of reception superelevation is in the up quality of reception of standard, generate the adjustment request of a rising down transmitting power this moment, adjust the adjustment amount that request generates the certain power control step-length power of a rising according to this, the value of certain power control step-length described herein is the power control step-length of a unit, and this mechanism is called when quality of reception superelevation " up raise its down transmitting power ".If described level and smooth up quality of reception index is lower than the ultralow thresholding that adds up that sets, illustrate that then the up quality of reception is ultralow in the up quality of reception of standard, generate an adjustment request that reduces down transmitting power this moment, adjust request according to this and generate the adjustment amount that reduces certain power control step-length, this mechanism is called " turning down its down transmitting power when the up quality of reception is ultralow "; Except that above-mentioned two kinds of situations, up quality of reception convergence then is described, generate an adjustment request of not adjusting down transmitting power this moment, adjust the adjustment amount that request generates a zero energy according to this.
The adjustment request of step 307, record current time slots and this are adjusted the adjustment amount of request, and the adjustment amount in the stipulated time is carried out level and smooth filtration treatment, will change express adjustment amount and filter out, and obtain one group of level and smooth adjustment request amount.
A kind of realization block diagram that Fig. 4 controls down transmitting power at the network side transmitter for the method for the invention, as shown in Figure 4, P (k) is the down transmitting power of k time slot; P (k-1) is the down transmitting power of k-1 time slot; Pbal (k) is the desired down transmitting power adjustment amount of download power balancing algorithm in k the time slot, and download power balancing algorithm described herein is a known algorithm in the industry, in inferior no longer narration; Ptpc (k) is that descending TPC orders desired down transmitting power adjustment amount in k the time slot; Qul (k) is up TPC order in k the time slot; Ulest (k) is the down transmitting power adjustment request that obtains according to up TPC order in k the time slot; Pun (k) is the down transmitting power adjustment amount that generates according to the up quality of reception in k the time slot.Described P (k-1), Ptpc (k) and Pbal (k) are input to adder unit 403 summations, and will be input in the adder unit 404 with value, above-mentioned Qul (k) is input to up quality judge module 401, up quality judge module 401 is handled the Qul (k) that imports according to above-mentioned steps 305 and the described flow process of step 306, and the adjustment request Ulest (k) of output down transmitting power, limited power regulation module 402 is handled Ulest (k) according to step 307 and the described flow process of step 308, output Pun (k) also is input in the adder unit 404 by a UILPC switch, if the UILPC switch is for opening state, then final P (k) value of adder unit 404 outputs is: P (k-1)+Ptpc (k)+Pun (k)+Pbal (k), otherwise final P (k) value of adder unit 404 outputs is: P (k-1)+Ptpc (k)+Pbal (k).
According to Fig. 4, total down transmitting power adjustment amount of RL network side transmitter can be according to obtaining with following formula (4):
In the above-mentioned formula (4), United ILPC Switch=' used ' expression UILPC switch is " opening " state, and United ILPC Switch=' notused ' expression UILPC switch is " pass " state.
Illustrate the implementation procedure of the method for the invention below:
If a UE is in a sub-district, what carry out communication in the network system is the wall scroll Radio Link, because the convergence of inner loop power control is very easy to reach convergent requirement, up quality of reception this moment superelevation not, not ultralow yet, do not need to adjust down transmitting power according to the up quality of reception again, the influence when therefore method of the present invention is to single Radio Link is very little, and whether therefore need not distinguish is soft changing state.
If two UE are in the switch area of a plurality of sub-districts, then UE has many RL, when " up-downgoing coupling loss imbalance between soft handover branches ", because UE adjusts uplink transmission power according to the TPC order of the big RL of up coupling loss, thereby the up quality of reception of the RL that up coupling loss is little will superelevation, the waste ascending power.According to method of the present invention, when the up quality of reception superelevation of RL, suitably heighten the down transmitting power of this RL, the descending quality of reception of this RL is raise, thereby make UE not ignore the downlink space interface information 102 of this RL, and demodulate the up TPC order of this RL, adjust uplink transmission power according to this TPC order again, finally make this up inner-loop power control convergence, saved power.
When " up-downgoing coupling loss balance between soft handover branches ", up inner-loop power control is converged on the little RL of up coupling loss, thereby the up quality of reception of the big RL of up coupling loss will be ultralow.This moment, descending inner-loop power control also was converged on the little RL of descending coupling loss, and the transmitting power of the RL that descending coupling loss is big is also little for the contribution of descending reception, but UE also will consume the down transmitting power of this RL, and downlink capacity is not high.According to method of the present invention, when the up quality of reception is ultralow, turn down its down transmitting power, minimum up to down transmitting power is transferred to, the down transmitting power that UE is consumed drops to low, thereby improves the up-downgoing capacity.Down transmitting power is transferred to when minimum, just be equivalent to the effect that the SSDT method is reached in the prior art, but the method for the invention is simplified manyly than the SSDT method on realization mechanism.
Two mechanism provided by the invention can play the effect that mutually replenishes: suppose that UE 1 moves to sub-district 2 from the sub-district in soft handover area, the Radio Link of sub-district 1 correspondence is RL1, and the Radio Link of sub-district 2 correspondences is RL2.When UE is in the main area of coverage of sub-district 1, be in " up-downgoing coupling loss balance between soft handover branches " state, the up quality of reception of RL2 is ultralow, regulating action according to " turning down its down transmitting power when the up quality of reception is ultralow " mechanism is adjusted to minimum value with the down transmitting power of RL2, the up-downgoing inner-loop power control all is converged in RL1, has improved downlink capacity.Along with UE moves to sub-district 2, the up coupling loss of RL2 is less than RL1, this moment is because the down transmitting power of RL2 is a minimum value, the descending quality of reception of RL2 is lower than the quality of reception of RL1, the up quality of reception superelevation that causes RL2, above-mentioned " up-downgoing coupling loss imbalance between soft handover branches " phenomenon has appearred, because when quality of reception superelevation " up heighten its down transmitting power " mechanism can be come up the down transmitting power adjustment of RL2, this moment, UE was in the main area of coverage of sub-district 2, from and reach " up-downgoing coupling loss balance between soft handover branches " state, this moment, the quality of reception of RL1 was ultralow, regulating action according to " turning down its down transmitting power when the up quality of reception is ultralow " mechanism is adjusted to minimum value with the down transmitting power of RL1, the up-downgoing inner-loop power control all is converged in RL2, so far completes successfully the power control of switch area.In addition, also can use respectively in order to solve these two adjustment mechanism of different problems.For example, can be on the base station only use when quality of reception superelevation " up heighten its down transmitting power " mechanism, perhaps only use " turning down its down transmitting power when the up quality of reception is ultralow " mechanism.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of 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 (9)
1, the method for power control in a kind of base station is characterized in that this method comprises:
A1, user terminal are assessed the descending quality of reception, generate down transmitting power control TPC order according to assessment result, and should descending TPC order send to the base station;
A2, the described descending TPC order of base station demodulation, obtain the down transmitting power adjustment amount of this descending TPC order, and the up quality of reception assessed, generate up TPC order and up quality of reception index, generate capable transmitting power adjustment amount according to up quality of reception index again, and utilize this to adjust base station down transmitting power by the down transmitting power adjustment amount of up quality of reception generation and the down transmitting power adjustment amount of described descending TPC order;
A3, base station send to user terminal with described up TPC order, and user terminal is resolved this up TPC order, obtain the uplink transmission power adjustment amount of this up TPC order, according to this power adjustment uplink transmission power are adjusted.
2, the method for claim 1 is characterized in that, generating according to up quality of reception index described in the step a2, the process of capable transmitting power adjustment amount comprises:
Judge the convergence of the up quality of reception according to up quality of reception index, if up quality of reception index superelevation, then generates an adjustment amount of heightening down transmitting power in a predefined superelevation thresholding; If up quality of reception index is ultralow in a predefined ultralow thresholding, then generate the adjustment amount of a reduction down transmitting power, otherwise, generate a zero energy adjustment amount.
3, the method for claim 1 is characterized in that, the process that generates a descending transmitting power adjustment amount according to the up quality of reception described in the step a2 comprises:
B1, the described up quality of reception index of record, and the up quality of reception index in the stipulated time carried out level and smooth filtration treatment, obtain the accumulation amount of level and smooth up quality of reception index in this stipulated time;
B2, judge the convergence of the up quality of reception according to the accumulation amount of described level and smooth up quality of reception index, the thresholding if the predefined superelevation that is higher than the accumulation amount of described level and smooth up quality of reception index adds up then generates the adjustment request of a rising down transmitting power; If the accumulation amount of described level and smooth up quality of reception index is lower than the ultralow thresholding that adds up that sets, then generate an adjustment request that reduces down transmitting power; Otherwise, then generate an adjustment request of not adjusting down transmitting power;
B3, the down transmitting power adjustment request that generates suddenly according to previous step generate a descending transmitting power adjustment amount.
4, method as claimed in claim 3 is characterized in that, further comprises after the described step b3:
C1, record described down transmitting power adjustment request and down transmitting power adjustment amount, and the down transmitting power adjustment amount in the stipulated time carried out level and smooth filtration treatment, obtain the accumulation amount of level and smooth down transmitting power adjustment amount in this stipulated time;
C2, in adjusting the scope of power, judge the state of current adjustment request and described level and smooth down transmitting power adjustment amount: if the adjustment request of current time slots is the rising down transmitting power, and the accumulation amount of level and smooth down transmitting power adjustment amount is lower than the maximum of predefined rising power in the described stipulated time, then generates the down transmitting power adjustment amount of the certain power control step-length of a rising; If the adjustment request of current time slots is for reducing down transmitting power, and the accumulation amount of level and smooth down transmitting power adjustment amount is higher than the maximum of predefined reduction power in the described stipulated time, then generates the down transmitting power adjustment amount of the certain power control step-length of a reduction; Otherwise, then generate a subzero capable transmitting power adjustment amount.
5, the method for claim 1 is characterized in that, the method for described adjustment base station down transmitting power is:
Obtain the down transmitting power adjustment amount that obtains by the download power balancing algorithm and the down transmitting power of a last time slot, the down transmitting power adjustment amount that obtains with the down transmitting power adjustment amount of described descending TPC order, the described down transmitting power adjustment amount that generates according to up quality of reception index, by the download power balancing algorithm and the down transmitting power addition of a last time slot, obtain the down transmitting power of current time slots, adjust base station down transmitting power according to this down transmitting power.
6, the method for claim 1 is characterized in that, preestablishes an associating inner loop power control algolithm switch, generates in described step a2 after up TPC order and the up quality of reception index, further comprises:
Judge the state of described associating inner loop power control algolithm switch, if this switch is in out state, then generate capable transmitting power adjustment amount, and utilize this to adjust base station down transmitting power by the down transmitting power adjustment amount of up quality of reception generation and the down transmitting power adjustment amount of described descending TPC order according to up quality of reception index; Otherwise, utilize the down transmitting power adjustment amount of described descending TPC order to adjust base station down transmitting power.
7, the method for claim 1 is characterized in that, execution in step a1 is to step a3 in the power control process of each time slot; Perhaps, only the regulation time slot power control process in execution in step a1 to step a3.
As claim 1 or 7 described methods, it is characterized in that 8, the value of the described down transmitting power adjustment amount that generates according to up quality of reception index is the integral multiple of unit power control step-length.
As claim 1,2,3,5 or 6 described methods, it is characterized in that 9, described up quality of reception index is: the assessed value of the assessed value of up signal interference ratio, up TPC command word or up signal interference ratio and the desired value of up signal interference ratio poor.
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