CN101662825B - Power control method for code division multiple access system and system thereof - Google Patents
Power control method for code division multiple access system and system thereof Download PDFInfo
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Abstract
The invention provides a power control method for a code division multiple access system, comprising the steps: a base station adjusts a base station signal to interference ratio target value according to a coding result of a transmission block; a wireless network controller obtains a new wireless network controller signal to interference ratio target value according a signal to interference ratio deviation value reported to the base station and the coding result of the transmission block, and controls outer loop power with the new wireless network controller signal to interference ratio target value; and the base station obtains a new base station signal to interference ratio target value according to the adjusted base station signal to interference ratio target value target value and the new wireless network controller signal to interference ratio target value. The invention also provides a power control method for the code division multiple access system. The invention can fast reduce the wireless network controller signal to interference ratio target value for the outer loop power control and the base station signal to interference ratio target value for the inner power control, and has fast convergence speed, thereby effectively saving the transmission power of UE and the capacity resource of the network.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of Poewr control method and system that is used for code division multiple access system.
Background technology
Code division multiple access (Code Division Multiple Access, CDMA) in the wireless communication system, each wireless terminal (User Equipment, signal phase mutual interference UE), the also phase mutual interference of signal between neighbor base station and sub-district (Cell).Soaring each other for the signal that prevents each terminal in each sub-district, Poewr control method is most important.(Wideband CDMA WCDMA) is example, in 3GPP (The 3rdGeneration Partnership Project) agreement, has defined the method for multiple power control, comprises external circule power control and inner-loop power control with WCDMA.At the SIRtarget (sir target value) that use the external circule power control adjustment base station (NodeB) that radio network controller (RNC) carries out, the SIRtarget that inner-loop power control provides according to external circule power control carries out power control (such as in 3GPP standard TS 25.214, having defined up inner-loop power control method).According to the mechanism of 3GPP protocol definition, the SIRtarget of inner-loop power control is directly adjusted by the external circule power control of RNC, and granularity is 0.1dB.
Fig. 1 shows the power control flow of prior art.Handling process above among the figure in the big square frame is accomplished in RNC, below flow process in the big square frame in NodeB, accomplish.The measurement of SIRerror and participation are not necessarily in existing power control techniques; So in the RNC of Fig. 1 handles; Dot the SIRerror related content or bracket with bracket, expression can SIRerror measures and participation with also carrying out.The measurement of SIRerror and report clear and definite definition has been arranged in the agreement of 3GPP.In the prior art, the sir target value of NodeB inner-loop power control is directly with the RNCSIRtarget of RNC configuration.
The inventor finds that there is following problem at least in prior art: when the mistake piece occurring; RNC can in time raise SIRtarget; But when not missing piece, RNC needs the long time measure block error rate BLER, thereby causes the power of industry to control the phenomenon that the fast liter of ubiquity falls slowly.Descending just means also that slowly the SIRtarget convergence rate is slower, the transmitting power of waste UE, the capacity resource of waste network.That is, existing Poewr control method exists SIRtarget adjustment granularity bigger, and convergence rate waits shortcoming more slowly.
Summary of the invention
The present invention aims to provide a kind of Poewr control method and system that is used for code division multiple access system, and the SIRtarget adjustment granularity that exists with the solution prior art is bigger, the problem that convergence rate is slower.
According to an aspect of the present invention, a kind of Poewr control method that is used for code division multiple access system is provided, has may further comprise the steps: the base station is according to transmission block decode results adjustment base station signal interference ratio desired value; Radio network controller obtains new radio network controller signal interference ratio desired value according to signal interference ratio deviate and the transmission block decode results that the base station reports, and carries out exterior ring power control with new radio network controller signal interference ratio desired value; The base station obtains new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value, and carries out inner loop power control with new base station signal interference ratio desired value.
Preferably, the base station comprises according to transmission block decode results adjustment base station signal interference ratio desired value: decipher the uplink transmission block of each wireless terminal of receiving the base station, and the transmission block decode results is reported radio network controller; Adjusted base station signal interference ratio desired value is calculated according to the transmission block decode results in the base station:
When the transmission block decode results is correct for deciphering, then base station signal interference ratio desired value is adjusted into: NBSIRtarget
Adj=NBSIRtarget-NBDnStep, wherein, NBSIRtarget
AdjBe adjusted base station signal interference ratio desired value, NBSIRtarget is a present base station signal interference ratio desired value, and NBDnStep is the decline step-length of base station signal interference ratio desired value;
When the transmission block decode results is decoding error, then base station signal interference ratio desired value is adjusted into: NBSIRtarget
Adj=min (RNCSIRtarget, NBSIRtarget+NBUpStep), wherein, NBSIRtarget
AdjBe adjusted base station signal interference ratio desired value, RNCSIRtarget is current radio network controller signal interference ratio desired value, and NBSIRtarget is a present base station signal interference ratio desired value, and NBUpStep is the rising step-length of base station signal interference ratio desired value.
Preferably, the value of the decline step-length of the rising step-length of base station signal interference ratio desired value and base station signal interference ratio desired value is set to fixed value or dynamically adjusts according to the current reception condition of each wireless terminal.
Preferably, the difference statistics that the signal interference ratio deviate signal interference ratio that to be the base station estimate according to each wireless terminal deducts the current radio network controller signal interference ratio desired value that the base station receives obtains, and the signal interference ratio deviate be on the occasion of, negative value perhaps 0.
Preferably, radio network controller comprises according to signal interference ratio deviate and the new radio network controller signal interference ratio desired value of transmission block decode results acquisition that the base station reports: radio network controller according to signal interference ratio deviate and the new radio network controller signal interference ratio desired value of transmission block decode results calculating is:
RNCSIRtarget
New=RNCSIRtarget+SIRerror+RNCStep, wherein, RNCSIRtarget
NewBe new radio network controller signal interference ratio desired value; RNCSIRtarget is current radio network controller signal interference ratio desired value; SIRerror is the signal interference ratio deviate that the base station reports; RNCStep is the radio network controller that the is provided with step value according to lifting of transmission block decode results or decline radio network controller signal interference ratio desired value, and its value can be on the occasion of, negative value or 0;
Radio network controller sends to the base station with new radio network controller signal interference ratio desired value.
Preferably, the base station obtains new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value and comprises: with of the up-to-date acquisition in adjusted base station signal interference ratio desired value and the new radio network controller signal interference ratio desired value as new base station signal interference ratio desired value.
Preferably, the base station obtains new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value and also comprises: get the smaller value in new radio network controller signal interference ratio desired value and the present base station signal interference ratio desired value; With of the up-to-date acquisition in adjusted base station signal interference ratio desired value and the smaller value as new base station signal interference ratio desired value.
Preferably; The base station obtains new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value and also comprises: when the newly-built or new radio network controller signal interference ratio desired value of link is bigger than its previous radio network controller signal interference ratio desired value, with of the up-to-date acquisition in adjusted base station signal interference ratio desired value and the new radio network controller signal interference ratio desired value as new base station signal interference ratio desired value; When new radio network controller signal interference ratio desired value than its previous radio network controller signal interference ratio desired value hour; Get the smaller value in new radio network controller signal interference ratio desired value and the present base station signal interference ratio desired value, and with of the up-to-date acquisition in adjusted base station signal interference ratio desired value and the smaller value as new base station signal interference ratio desired value.
According to another aspect of the present invention; A kind of power control system that is used for code division multiple access system also is provided; Comprise: radio network controller; The signal interference ratio deviate and the transmission block decode results that are used for reporting according to the base station obtain new radio network controller signal interference ratio desired value, and carry out exterior ring power control with new radio network controller signal interference ratio desired value; The base station; Be used for according to transmission block decode results adjustment base station signal interference ratio desired value; Obtain new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value, and carry out inner loop power control with new base station signal interference ratio desired value.
Preferably, the base station comprises: decoding module is used for the uplink transmission block of each wireless terminal of receiving is deciphered, and the transmission block decode results is reported radio network controller; Adjusting module is used for calculating adjusted base station signal interference ratio desired value according to the transmission block decode results and is:
When the transmission block decode results is correct for deciphering, then base station signal interference ratio desired value is adjusted into: NBSIRtarget
Adj=NBSIRtarget-NBDnStep, wherein, NBSIRtarget
AdjBe adjusted base station signal interference ratio desired value, NBSIRtarget is a present base station signal interference ratio desired value, and NBDnStep is the decline step-length of base station signal interference ratio desired value;
When the transmission block decode results is decoding error, then base station signal interference ratio desired value is adjusted into: NBSIRtarget
Adj=min (RNCSIRtarget, NBSIRtarget+NBUpStep), wherein, NBSIRtarget
AdjBe adjusted base station signal interference ratio desired value, RNCSIRtarget is current radio network controller signal interference ratio desired value, and NBSIRtarget is a present base station signal interference ratio desired value, and NBUpStep is the rising step-length of base station signal interference ratio desired value.
Preferably, the difference statistics that the signal interference ratio deviate signal interference ratio that to be the base station estimate according to each wireless terminal deducts the current radio network controller signal interference ratio desired value that the base station receives obtains, and the signal interference ratio deviate be on the occasion of, negative value perhaps 0.
Preferably, radio network controller comprises: computing module is used for calculating new radio network controller signal interference ratio desired value according to signal interference ratio deviate and transmission block decode results and is: RNCSIRtarget
New=RNCSIRtarget+SIRerror+RNCStep, wherein, RNCSIRtarget
NewBe new radio network controller signal interference ratio desired value; RNCSIRtarget is current radio network controller signal interference ratio desired value; SIRerror is the signal interference ratio deviate that the base station reports; RNCStep is the radio network controller that the is provided with step value according to lifting of transmission block decode results or decline radio network controller signal interference ratio desired value, and its value can be on the occasion of, negative value or 0; Sending module is used for new radio network controller signal interference ratio desired value is sent to the base station.
Preferably, the base station also comprises: up-to-date desired value acquisition module is used for the up-to-date acquisition of adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value one as new base station signal interference ratio desired value.
Preferably; The base station also comprises: up-to-date desired value acquisition module; Be used for getting the smaller value of new radio network controller signal interference ratio desired value and present base station signal interference ratio desired value, and with of the up-to-date acquisition in adjusted base station signal interference ratio desired value and the smaller value as new base station signal interference ratio desired value.
Preferably; The base station also comprises: up-to-date desired value acquisition module; Be used for when the newly-built or new radio network controller signal interference ratio desired value of link is bigger than its previous radio network controller signal interference ratio desired value, with of the up-to-date acquisition in adjusted base station signal interference ratio desired value and the new radio network controller signal interference ratio desired value as new base station signal interference ratio desired value; When new radio network controller signal interference ratio desired value than its previous radio network controller signal interference ratio desired value hour; Get the smaller value in new radio network controller signal interference ratio desired value and the present base station signal interference ratio desired value, and with of the up-to-date acquisition in adjusted base station signal interference ratio desired value and the smaller value as new base station signal interference ratio desired value.
Because unite adjustment SIRtarget through base station and radio network controller; It is bigger to have solved in the CDMA sub-district that prior art exists SIRtarget adjustment granularity; The problem that convergence rate is slower; Can make radio network controller signal interference ratio desired value (being RNCSIRtarget) that is used for external circule power control and the base station signal interference ratio desired value (being NBSIRtarget) that is used for inner-loop power control descend comparatively fast, fast convergence rate, thus saved the transmitting power of UE and the capacity resource of network effectively.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the power control flow of prior art;
Fig. 2 shows the flow chart according to the Poewr control method that is used for code division multiple access system of the embodiment of the invention;
Fig. 3 shows the flow chart of the Poewr control method that is used for code division multiple access system according to the preferred embodiment of the invention;
Fig. 4 shows the Poewr control method of prior art and the simulated effect comparison diagram of Poewr control method according to the preferred embodiment of the invention;
Fig. 5 shows the sketch map according to the power control system that is used for code division multiple access system of the embodiment of the invention.
Embodiment
Below with reference to accompanying drawing and combine embodiment, specify the present invention.
Fig. 2 shows the flow chart according to the Poewr control method that is used for code division multiple access system of the embodiment of the invention, may further comprise the steps:
Step S10, the base station is according to transmission block decode results adjustment base station signal interference ratio desired value;
Step S20, radio network controller obtains new radio network controller signal interference ratio desired value according to signal interference ratio deviate and the transmission block decode results that the base station reports, and carries out exterior ring power control with new radio network controller signal interference ratio desired value;
Step S30, the base station obtains new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value, and carries out inner loop power control with new base station signal interference ratio desired value.
This embodiment unites adjustment SIRtarget through base station and radio network controller, and it is bigger to have solved in the CDMA sub-district that prior art exists SIRtarget adjustment granularity, problem that convergence rate is slower.Radio network controller signal interference ratio desired value (being RNCSIRtarget) that is used for external circule power control and the base station signal interference ratio desired value (being NBSIRtarget) that is used for inner-loop power control descend comparatively fast to use this embodiment to make; Fast convergence rate, thus the transmitting power of UE and the capacity resource of network saved effectively.
Preferably, step S10 comprises: decipher the uplink transmission block of each wireless terminal of receiving the base station, and the transmission block decode results is reported radio network controller; Adjusted base station signal interference ratio desired value is calculated according to the transmission block decode results in the base station:
When the transmission block decode results is correct for deciphering, then base station signal interference ratio desired value is adjusted into: NBSIRtarget
Adj=NBSIRtarget-NBDnStep, wherein, NBSIRtarget
AdjBe adjusted base station signal interference ratio desired value, NBSIRtarget is a present base station signal interference ratio desired value, and NBDnStep is the decline step-length of base station signal interference ratio desired value;
When the transmission block decode results is decoding error, then base station signal interference ratio desired value is adjusted into: NBSIRtarget
Adj=min (RNCSIRtarget, NBSIRtarget+NBUpStep), wherein, NBSIRtarget
AdjBe adjusted base station signal interference ratio desired value, RNCSIRtarget is a present base station controller signal interference ratio desired value, and NBSIRtarget is a present base station signal interference ratio desired value, and NBUpStep is the rising step-length of base station signal interference ratio desired value.
Wherein, the value of the decline step-length NBDnStep of the rising step-length NBUpStep of base station signal interference ratio desired value and base station signal interference ratio desired value is set to fixed value or dynamically adjusts according to the current reception condition of each wireless terminal.
The preferred embodiment provides the specific embodiments of base station according to transmission block decode results adjustment base station signal interference ratio desired value.
Preferably, the difference statistics that the signal interference ratio that signal interference ratio deviate (being SIRerror) is estimated according to each wireless terminal for the base station deducts the current radio network controller signal interference ratio desired value that the base station receives obtains, and the signal interference ratio deviate be on the occasion of, negative value perhaps 0.In Poewr control method of the present invention, when the RNC external circule power control is adjusted RNCSIRtarget, need add the signal interference ratio deviate, with the RNCSIRtarget of assurance RNC adjustment and the NBSIRtarget step basically identical of NodeB self adjustment.
Preferably, step S20 comprises: radio network controller according to signal interference ratio deviate and the new radio network controller signal interference ratio desired value of transmission block decode results calculating is:
RNCSIRtarget
New=RNCSIRtarget+SIRerror+RNCStep, wherein, RNCSIRtarget
NewBe new radio network controller signal interference ratio desired value; RNCSIRtarget is current radio network controller signal interference ratio desired value; SIRerror is the signal interference ratio deviate that the base station reports; RNCStep is the radio network controller that the is provided with step value according to lifting of transmission block decode results or decline radio network controller signal interference ratio desired value, and its value can be on the occasion of, negative value or 0;
Radio network controller sends to the base station with new radio network controller signal interference ratio desired value.
The specific embodiments that the preferred embodiment provides signal interference ratio deviate that radio network controller reports according to the base station and transmission block decode results to obtain new radio network controller signal interference ratio desired value.
Preferably, step S30 comprises: with of the up-to-date acquisition in adjusted base station signal interference ratio desired value and the new radio network controller signal interference ratio desired value as new base station signal interference ratio desired value.
The preferred embodiment provides the base station to obtain a kind of specific embodiments of new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value.
Preferably, step S30 also comprises: get the smaller value in new radio network controller signal interference ratio desired value and the present base station signal interference ratio desired value; With of the up-to-date acquisition in adjusted base station signal interference ratio desired value and the smaller value as new base station signal interference ratio desired value.
The preferred embodiment provides the base station to obtain the another kind of specific embodiments of new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value.
Preferably; Step S30 also comprises: when the newly-built or new radio network controller signal interference ratio desired value of link is bigger than its previous radio network controller signal interference ratio desired value, with of the up-to-date acquisition in adjusted base station signal interference ratio desired value and the new radio network controller signal interference ratio desired value as new base station signal interference ratio desired value; When new radio network controller signal interference ratio desired value than its previous radio network controller signal interference ratio desired value hour; Get the smaller value in new radio network controller signal interference ratio desired value and the present base station signal interference ratio desired value, and with of the up-to-date acquisition in adjusted base station signal interference ratio desired value and the smaller value as new base station signal interference ratio desired value.
The preferred embodiment provides the base station to obtain another specific embodiments of new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value.
Above-mentioned preferred embodiment provides the base station to obtain three kinds of specific embodiments arranged side by side of new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value.In the process that actual implementation is executed, adopt wherein a kind of getting final product.
The present invention for the technical scheme that technical problem adopted that solves the prior art existence is: adopt base station (Node B) and radio network controller (RNC) to unite adjustment SIRtarget method.Method flow is divided into two flow processs, and one is the flow process of NodeB self adjustment sir target value, the flow process for the adjustment sir target value of RNC external circule power control triggering.Be designated as RNCSIRtarget to the sir target value of RNC adjustment among the present invention for convenience, be designated as NBSIRtarget to the sir target value of NodeB adjustment.
As shown in Figure 3, wherein the flow process of NodeB self adjustment sir target value is:
Step S302, NodeB receives and deciphers the uplink transmission block of each UE, and decode results will report RNC simultaneously.
Step S304, each UE of NodeB adjustment really is used for the sir target value of inner-loop power control: NBSIRtarget.NodeB judges whether the current transmission block decode results of each UE is correct, if, then change step S306 over to, if not, then change step S308 over to.
Step S306 if the decoding of current transmission block is correct, then reduces NBDnStep to NBSIRtarget, that is:
NBSIRtarget
adj＝NBSIRtarget-NBDnStep。
Step S308 if current transmission block decoding error then promotes NBUpStep to NBSIRtarget, disposes RNCSIRtarget but can not surpass RNC, that is: recently
NBSIRtarget
Adj=min (RNCSIRtarget, NBSIRtarget+NBUpStep); Wherein the min function representation is selected less one of numerical value from two input parameters.
In above-mentioned step S306 and step S308, NBUpStep and NBDnStep are the sir target value rising step-length of the NodeB of setting in advance and the sir target value NBSIRtarget decline step-length of NodeB.The unit of these values can be dB.NBUpStep and NBDnStep can be provided with fixed value, span 0～3dB.Such as NBUpStep=0.1dB, NBDnStep=0.01dB.NBUpStep and NBDnStep also can dynamically adjust according to the current reception condition of each UE.
Step S310 carries out inner-loop power control with the up-to-date NBSIRtarget of each UE as the sir target value of each UE.
The flow process of the adjustment sir target value that the RNC external circule power control triggers is:
Step S312, RNC carry out external circule power control and handle (OLPC).RNC obtains the SIRerror that NodeB reports, and information such as transmission block decoding are carried out external circule power control and handled, adjustment RNCSIRtarget, and when adjusting RNCSIRtarget at every turn, the method below adopting:
RNCSIRtarget
new＝RNCSIRtarget+SIRerror+RNCStep；
Wherein, SIRerror is the signal interference ratio deviate that NodeB reports, and can be on the occasion of, negative value or 0.RNCStep lifting that to be RNC provide according to transmission block decoding information or the step value of decline RNCSIRtarget, can be on the occasion of or negative value, or 0.
Step S314, RNC judge whether RNCSIRtarget changes, if, then change step S316 over to, if not, then return step S312.
Step S316, RNC sends new RNCSIRtarget and gives NodeB.
Step S318, NodeB receives new RNCSIRtarget from RNC.
Step S320, NodeB changes step S310 over to according to the SIRtarget adjustment NBSIRtarget of RNC after the adjustment.NodeB receives new RNCSIRtarget from RNC, and is adjusted into NBSIRtarget RNCSIRtarget or is adjusted into the smaller value among RNCSIRtarget and the NBSIRtarget, that is:
NBSIRtarget
adj＝RNCSIRtarget；
Perhaps NBSIRtarget
Adj(RNCSIRtarget, NBSIRtarget), wherein the peek from two input parameters of min function representation is worth less one to=min.
Step S310 carries out inner-loop power control with the up-to-date NBSIRtarget of each UE as the sir target value of each UE.
The RNCSIRtarget that step S322, the SIR that uses each UE to estimate deduct the RNC configuration adds up SIRerror, and reports RNC.Statistics during SIRerror without NBSIRtarget.
The invention is characterized in:
According to current transmission block decoding situation, adjustment is used for the desired value of inner-loop power control among the NodeB, and the adjustment step-length can be very fine, and such as reaching 0.01dB even littler, adjustment cycle can be very little, such as a transmission block adjustment once.
In addition, when the RNC external circule power control is adjusted RNCSIRtarget, need add SIRerror, with the RNCSIRtarget of assurance RNC adjustment and the NBSIRtarget step basically identical of NodeB self adjustment.
According to accompanying drawing and embodiment the present invention is done further explain below.According to these accompanying drawings, the technical staff in same field can be easy to realize the present invention.
Fig. 3 shows the flow chart of the Poewr control method that is used for code division multiple access system according to the preferred embodiment of the invention.Wherein the RNC part must be adjusted RNCSIRtarget according to the SIRerror measured value.For NodeB, then increased two aspect contents newly:
(1) with the sir target value of NBSIRtarget as inner loop power control.Adjust NBSIRtarget according to current transmission block decode results.If decoding is correctly then NBSIRtarget decline NBDnStep, this NBDnStep can be provided with meticulouslyr, dispose the little one magnitude of granularity such as RNC to the SIRtarget of NodeB, reach 0.01dB.If decoding error, the NBUpStep that then rises, but can not surpass the up-to-date RNCSIRtarget that RNC disposes.NBUpStep also can be provided with meticulouslyr, such as 0.05dB, and perhaps 0.25dB etc.
(2) when RNC disposes new RNCSIRtarget; Can directly make the NBSIRtarget of NodeB into RNCSIRtarget, perhaps in existing NBSIRtarget and new RNCSIRtarget, keep the value of the new NBSIRtarget of a less conduct of numerical value.The effect difference of these two kinds of methods is little.A kind of more desirable way is when the newly-built or new RNCSIRtarget of link is bigger than old RNCSIRtarget, directly to make the NBSIRtarget of NodeB into RNCSIRtarget, otherwise do not change the value (promptly keeping little) of NBSIRtarget.That is, if RNC lifting RNCSIRtarget then does inner-loop power control with the value of RNC; If RNC reduces RNCSIRtarget, then do inner-loop power control with value less among NBSIRtarget and the RNCSIRtarget.The sir target value of inner-loop power control is used NBSIRtarget always.It is necessary calculating SIRerror, and uses the SIR that estimates to deduct RNCSIRtarget always and add up.
Fig. 4 shows the Poewr control method of prior art and the simulated effect comparison diagram of Poewr control method according to the preferred embodiment of the invention.This example is example with voice user, and every 20ms time produces a transmission block.The sir target value was 3dB when Radio Link had just been set up.UE alternately is in two kinds of wireless environments, and the time of staying is 20 seconds in every kind of wireless environment, i.e. the time of 1000 transmission blocks.Adopt the power control algorithm of typical R NC: if Block Error Rate is greater than 1% in nearest 100 transmission blocks, lifting RNCSIRtarget then, the lifting amount is 0.3dB, and restarts the Block Error Rate statistics; If Block Error Rate is smaller or equal to 1% in nearest 100 transmission blocks, the RNCSIRtarget that then descends, slippage is 0.1dB.For two kinds of different wireless environments, in order to reach 1% Block Error Rate, required SIRtarget is respectively-2.56dB ,-0.41dB, and what the fine line of square wave type was represented among Fig. 4 is exactly that two kinds of environment replace SIRtarget desirable under the situation.The power control algorithm of prior art directly carries out power control with RNCSIRtarget as the sir target value, thereby the RNCSIRtarget change curve that obtains is shown in the heavy line among Fig. 4.
Adopt Poewr control method of the present invention, parameter is set is:
NBUpStep＝0.08dB；
NBDnStep＝0.01dB；
If RNC lifting RNCSIRtarget then does inner-loop power control with the value of RNC; If RNC reduces RNCSIRtarget, then do inner-loop power control with value less among NBSIRtarget and the RNCSIRtarget.
Thick dashed line is exactly the change curve of NBSIRtarget of the Poewr control method of the preferred embodiment of the present invention among Fig. 4, and chain-dotted line is the change curve of RNCSIRtarget of the Poewr control method of the preferred embodiment of the present invention.Visible from figure:
When 1. link had just been set up, two kinds of algorithms all began toward decline from initial sir target value 3dB, but the sir target value of prior art descends slowly, has spent 3000 transmission blocks (i.e. 60 seconds) just to converge near the normal SIR, and 3dB has descended.And the sir target value of the inventive method descends than very fast, has used 500 transmission blocks just to drop to-2.5dB from 3dB, the 5.5dB that descended, and convergence rate is 11 times of prior art.In this 60 second, prior art has obviously been wasted the capacity of transmitting power and the system of UE.
2. when wireless environment variation; Prior art can't in time be adjusted SIRtarget to follow the tracks of the variation of wireless environment; When required sir target value is low; The SIRtarget of prior art is still than higher, and also restrained not 20 seconds (1000 transmission blocks), has also caused the waste of UE power dissipation and power system capacity.And no matter method of the present invention is the variation that NBSIRtarget or RNCSIRtarget can both catch up with wireless environment quickly, and dynamic stability can not cause the waste of tangible UE power dissipation and power system capacity near desirable SIRtarget value.
From statistics during this period of time; The average of desirable sir target value is-1.485dB; The mean value of the SIRtarget of prior art is 0.3212dB, and the average of RNCSIRtarget of the present invention is-1.0825dB, and the average of NBSIRtarget is-1.4119dB; It is thus clear that the sir target value of prior art is higher 1.8062dB.And the inventive method only higher 0.0731dB.1.8dB power dissipation mean the waste of capacity about 13%.Just because of this, some operators recognize this waste of capacity problem at present, and require equipment vendor that solution is provided, and the inventive method is a proper solution.
According to last surface analysis, in the system of visible the inventive method code division multiple access, can obtain very significantly beneficial effect.
Fig. 5 shows the sketch map according to the power control system that is used for code division multiple access system of the embodiment of the invention; Comprise: radio network controller 10; The signal interference ratio deviate and the transmission block decode results that are used for reporting according to the base station obtain new radio network controller signal interference ratio desired value, and carry out exterior ring power control with new radio network controller signal interference ratio desired value; Base station 20; Be used for according to transmission block decode results adjustment base station signal interference ratio desired value; Obtain new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value, and carry out inner loop power control with new base station signal interference ratio desired value.
This embodiment unites adjustment SIRtarget through base station and radio network controller, and it is bigger to have solved in the CDMA sub-district that prior art exists SIRtarget adjustment granularity, problem that convergence rate is slower.Radio network controller signal interference ratio desired value (being RNCSIRtarget) that is used for external circule power control and the base station signal interference ratio desired value (being NBSIRtarget) that is used for inner-loop power control descend comparatively fast to use this embodiment to make; Fast convergence rate, thus the transmitting power of UE and the capacity resource of network saved effectively.
Preferably, base station 20 comprises: decoding module 201 is used for the uplink transmission block of each wireless terminal of receiving is deciphered, and the transmission block decode results is reported radio network controller; Adjusting module 202 is used for calculating adjusted base station signal interference ratio desired value according to the transmission block decode results and is:
When the transmission block decode results is correct for deciphering, then base station signal interference ratio desired value is adjusted into: NBSIRtarget
Adj=NBSIRtarget-NBDnStep, wherein, NBSIRtarget
AdjBe adjusted base station signal interference ratio desired value, NBSIRtarget is a present base station signal interference ratio desired value, and NBDnStep is the decline step-length of base station signal interference ratio desired value;
When the transmission block decode results is decoding error, then base station signal interference ratio desired value is adjusted into: NBSIRtarget
Adj=min (RNCSIRtarget, NBSIRtarget+NBUpStep), wherein, NBSIRtarget
AdjBe adjusted base station signal interference ratio desired value, RNCSIRtarget is a present base station controller signal interference ratio desired value, and NBSIRtarget is a present base station signal interference ratio desired value, and NBUpStep is the rising step-length of base station signal interference ratio desired value.
The preferred embodiment provides the specific embodiments of base station according to transmission block decode results adjustment base station signal interference ratio desired value.
Preferably, the difference statistics that the signal interference ratio that signal interference ratio deviate (being SIRerror) is estimated according to each wireless terminal for the base station deducts the current radio network controller signal interference ratio desired value that the base station receives obtains, and the signal interference ratio deviate be on the occasion of, negative value perhaps 0.In power control system of the present invention, when the RNC external circule power control is adjusted RNCSIRtarget, need add the signal interference ratio deviate, with the RNCSIRtarget of assurance RNC adjustment and the NBSIRtarget step basically identical of NodeB self adjustment.
Preferably, radio network controller 10 comprises: computing module 101 is used for calculating new radio network controller signal interference ratio desired value according to signal interference ratio deviate and transmission block decode results and is: RNCSIRtarget
New=RNCSIRtarget+SIRerror+RNCStep, wherein, RNCSIRtarget
NewBe new radio network controller signal interference ratio desired value; RNCSIRtarget is current radio network controller signal interference ratio desired value; SIRerror is the signal interference ratio deviate that the base station reports; RNCStep is the radio network controller that the is provided with step value according to lifting of transmission block decode results or decline radio network controller signal interference ratio desired value, and its value can be on the occasion of, negative value or 0; Sending module 102 is used for new radio network controller signal interference ratio desired value is sent to the base station.
The specific embodiments that the preferred embodiment provides signal interference ratio deviate that radio network controller reports according to the base station and transmission block decode results to obtain new radio network controller signal interference ratio desired value.
Preferably, base station 20 also comprises: up-to-date desired value acquisition module 203 is used for the up-to-date acquisition of adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value one as new base station signal interference ratio desired value.
The preferred embodiment provides the base station to obtain a kind of specific embodiments of new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value.
Perhaps; Up-to-date desired value acquisition module 203 is used for getting the smaller value of new radio network controller signal interference ratio desired value and present base station signal interference ratio desired value, and with of the up-to-date acquisition in adjusted base station signal interference ratio desired value and the smaller value as new base station signal interference ratio desired value.
The preferred embodiment provides the base station to obtain the another kind of specific embodiments of new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value.
Perhaps; Up-to-date desired value acquisition module 203 is used for when the newly-built or new radio network controller signal interference ratio desired value of link is bigger than its previous radio network controller signal interference ratio desired value, with of the up-to-date acquisition in adjusted base station signal interference ratio desired value and the new radio network controller signal interference ratio desired value as new base station signal interference ratio desired value; When new radio network controller signal interference ratio desired value than its previous radio network controller signal interference ratio desired value hour; Get the smaller value in new radio network controller signal interference ratio desired value and the present base station signal interference ratio desired value, and with of the up-to-date acquisition in adjusted base station signal interference ratio desired value and the smaller value as new base station signal interference ratio desired value.
The preferred embodiment provides the base station to obtain another specific embodiments of new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value.
Above-mentioned preferred embodiment provides the base station to obtain three kinds of specific embodiments arranged side by side of new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and new radio network controller signal interference ratio desired value.In the process that actual implementation is executed, adopt wherein a kind of getting final product.
From above description, can find out that the present invention has realized following technique effect:
(1) can make radio network controller signal interference ratio desired value (being RNCSIRtarget) that is used for external circule power control and the base station signal interference ratio desired value (being NBSIRtarget) that is used for inner-loop power control descend comparatively fast, fast convergence rate.
(2) when wireless network environment changes, no matter be the variation that RNCSIRtarget or NBSIRtarget can both catch up with wireless environment quickly, thereby avoided the waste of capacity resource of transmitting power and the network of UE effectively.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize by calculation element.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a Poewr control method that is used for code division multiple access system is characterized in that, may further comprise the steps:
The base station is according to transmission block decode results adjustment base station signal interference ratio desired value;
Radio network controller obtains new radio network controller signal interference ratio desired value according to signal interference ratio deviate and the said transmission block decode results that said base station reports; And carry out exterior ring power with said new radio network controller signal interference ratio desired value and control; Wherein, The difference statistics that the said signal interference ratio deviate signal interference ratio that to be said base station estimate according to each wireless terminal deducts the current radio network controller signal interference ratio desired value that said base station receives obtains, and said signal interference ratio deviate be on the occasion of, negative value perhaps 0;
Wherein, said radio network controller comprises according to signal interference ratio deviate and the new radio network controller signal interference ratio desired value of said transmission block decode results acquisition that said base station reports:
Said radio network controller calculates said new radio network controller signal interference ratio desired value according to said signal interference ratio deviate and said transmission block decode results: RNCSIRtargetnew=RNCSIRtarget+SIRerror+RNCStep; Wherein, RNCSIRtargetnew is new radio network controller signal interference ratio desired value; RNCSIRtarget is current radio network controller signal interference ratio desired value; SIRerror is the signal interference ratio deviate that the base station reports, and RNCStep is the radio network controller that the is provided with step value according to lifting of transmission block decode results or decline radio network controller signal interference ratio desired value, and its value can be on the occasion of, negative value or 0;
Said radio network controller sends to said base station with said new radio network controller signal interference ratio desired value;
Said base station obtains new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and said new radio network controller signal interference ratio desired value, and carries out inner loop power control with said new base station signal interference ratio desired value.
2. Poewr control method according to claim 1 is characterized in that, the base station comprises according to transmission block decode results adjustment base station signal interference ratio desired value:
Decipher the uplink transmission block of each wireless terminal of receiving said base station, and the transmission block decode results is reported said radio network controller;
Said adjusted base station signal interference ratio desired value is calculated according to said transmission block decode results in said base station:
When said transmission block decode results is correct for deciphering, then base station signal interference ratio desired value is adjusted into:
NBSIRtarget
Adj=NBSIRtarget-NBDnStep, wherein, NBSIRtarget
AdjBe adjusted base station signal interference ratio desired value, NBSIRtarget is a present base station signal interference ratio desired value, and NBDnStep is the decline step-length of base station signal interference ratio desired value;
When said transmission block decode results is decoding error, then base station signal interference ratio desired value is adjusted into:
NBSIRtarget
Adj=min (RNCSIRtarget, NBSIRtarget+NBUpStep), wherein, NBSIRtarget
AdjBe adjusted base station signal interference ratio desired value, RNCSIRtarget is current radio network controller signal interference ratio desired value, and NBSIRtarget is a present base station signal interference ratio desired value, and NBUpStep is the rising step-length of base station signal interference ratio desired value.
3. Poewr control method according to claim 2; It is characterized in that the value of the decline step-length of the rising step-length of said base station signal interference ratio desired value and said base station signal interference ratio desired value is set to fixed value or dynamically adjusts according to the current reception condition of each wireless terminal.
4. Poewr control method according to claim 1 is characterized in that, said base station obtains new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and said new radio network controller signal interference ratio desired value and comprises:
With of the up-to-date acquisition in said adjusted base station signal interference ratio desired value and the said new radio network controller signal interference ratio desired value as said new base station signal interference ratio desired value.
5. Poewr control method according to claim 1 is characterized in that, said base station obtains new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and said new radio network controller signal interference ratio desired value and also comprises:
Get said new radio network controller signal interference ratio desired value and the smaller value in the present base station signal interference ratio desired value;
With of the up-to-date acquisition in said adjusted base station signal interference ratio desired value and the said smaller value as said new base station signal interference ratio desired value.
6. Poewr control method according to claim 1 is characterized in that, said base station obtains new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and said new radio network controller signal interference ratio desired value and also comprises:
When the newly-built or said new radio network controller signal interference ratio desired value of link is bigger than its previous radio network controller signal interference ratio desired value, with of the up-to-date acquisition in said adjusted base station signal interference ratio desired value and the said new radio network controller signal interference ratio desired value as said new base station signal interference ratio desired value;
When said new radio network controller signal interference ratio desired value than its previous radio network controller signal interference ratio desired value hour; Get said new radio network controller signal interference ratio desired value and the smaller value in the present base station signal interference ratio desired value, and with of the up-to-date acquisition in said adjusted base station signal interference ratio desired value and the said smaller value as said new base station signal interference ratio desired value.
7. a power control system that is used for code division multiple access system is characterized in that, comprising:
Radio network controller; The signal interference ratio deviate and the transmission block decode results that are used for reporting according to the base station obtain new radio network controller signal interference ratio desired value; And carry out exterior ring power with said new radio network controller signal interference ratio desired value and control; Wherein, The difference statistics that the said signal interference ratio deviate signal interference ratio that to be said base station estimate according to each wireless terminal deducts the current radio network controller signal interference ratio desired value that said base station receives obtains, and said signal interference ratio deviate be on the occasion of, negative value perhaps 0;
Wherein, said radio network controller comprises: computing module is used for calculating said new radio network controller signal interference ratio desired value according to said signal interference ratio deviate and said transmission block decode results and is:
RNCSIRtargetnew=RNCSIRtarget+SIRerror+RNCStep; Wherein, RNCSIRtargetnew is new radio network controller signal interference ratio desired value, and RNCSIRtarget is current radio network controller signal interference ratio desired value, and SIRerror is the signal interference ratio deviate that the base station reports; RNCStep is the radio network controller that the is provided with step value according to lifting of transmission block decode results or decline radio network controller signal interference ratio desired value, and its value can be on the occasion of, negative value or 0; Sending module is used for said new radio network controller signal interference ratio desired value is sent to said base station;
Said base station; Be used for according to said transmission block decode results adjustment base station signal interference ratio desired value; Obtain new base station signal interference ratio desired value according to adjusted base station signal interference ratio desired value and said new radio network controller signal interference ratio desired value, and carry out inner loop power control with said new base station signal interference ratio desired value.
8. power control system according to claim 7 is characterized in that, said base station comprises:
Decoding module is used for the uplink transmission block of each wireless terminal of receiving is deciphered, and the transmission block decode results is reported said radio network controller;
Adjusting module is used for calculating said adjusted base station signal interference ratio desired value according to said transmission block decode results and is:
When said transmission block decode results is correct for deciphering, then base station signal interference ratio desired value is adjusted into:
NBSIRtarget
Adj=NBSIRtarget-NBDnStep, wherein, NBSIRtarget
AdjBe adjusted base station signal interference ratio desired value, NBSIRtarget is a present base station signal interference ratio desired value, and NBDnStep is the decline step-length of base station signal interference ratio desired value;
When said transmission block decode results is decoding error, then base station signal interference ratio desired value is adjusted into:
NBSIRtarget
Adj=min (RNCSIRtarget, NBSIRtarget+NBUpStep), wherein, NBSIRtarget
AdjBe adjusted base station signal interference ratio desired value, RNCSIRtarget is current radio network controller signal interference ratio desired value, and NBSIRtarget is a present base station signal interference ratio desired value, and NBUpStep is the rising step-length of base station signal interference ratio desired value.
9. according to the said power control system of claim 7, it is characterized in that said base station also comprises:
Up-to-date desired value acquisition module is used for the up-to-date acquisition of said adjusted base station signal interference ratio desired value and said new radio network controller signal interference ratio desired value one as said new base station signal interference ratio desired value.
10. power control system according to claim 7 is characterized in that, said base station also comprises:
Up-to-date desired value acquisition module; Be used for getting the said new radio network controller signal interference ratio desired value and the smaller value of present base station signal interference ratio desired value, and with of the up-to-date acquisition in said adjusted base station signal interference ratio desired value and the said smaller value as said new base station signal interference ratio desired value.
11. power control system according to claim 7 is characterized in that, said base station also comprises:
Up-to-date desired value acquisition module; Be used for when the newly-built or said new radio network controller signal interference ratio desired value of link is bigger than its previous radio network controller signal interference ratio desired value, with of the up-to-date acquisition in said adjusted base station signal interference ratio desired value and the said new radio network controller signal interference ratio desired value as said new base station signal interference ratio desired value; When said new radio network controller signal interference ratio desired value than its previous radio network controller signal interference ratio desired value hour; Get said new radio network controller signal interference ratio desired value and the smaller value in the present base station signal interference ratio desired value, and with of the up-to-date acquisition in said adjusted base station signal interference ratio desired value and the said smaller value as said new base station signal interference ratio desired value.
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| CN2009101788321A CN101662825B (en) | 2009-09-28 | 2009-09-28 | Power control method for code division multiple access system and system thereof |
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| CN2009101788321A CN101662825B (en) | 2009-09-28 | 2009-09-28 | Power control method for code division multiple access system and system thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1514560A (en) * | 2002-12-31 | 2004-07-21 | 深圳市中兴通讯股份有限公司上海第二 | Power control method of broad band CDMA mobile communication system |
| CN1838553A (en) * | 2005-03-24 | 2006-09-27 | 华为技术有限公司 | Method for realizing uplink outer-loop power control in mobile communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1514560A (en) * | 2002-12-31 | 2004-07-21 | 深圳市中兴通讯股份有限公司上海第二 | Power control method of broad band CDMA mobile communication system |
| CN1838553A (en) * | 2005-03-24 | 2006-09-27 | 华为技术有限公司 | Method for realizing uplink outer-loop power control in mobile communication system |
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