CN102647794B - Uplink resource allocation method in combination with PHR (Power Headroom Report) in LTE (Long Term Evolution) system - Google Patents

Uplink resource allocation method in combination with PHR (Power Headroom Report) in LTE (Long Term Evolution) system Download PDF

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CN102647794B
CN102647794B CN201210153268.XA CN201210153268A CN102647794B CN 102647794 B CN102647794 B CN 102647794B CN 201210153268 A CN201210153268 A CN 201210153268A CN 102647794 B CN102647794 B CN 102647794B
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刘星
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BEIJING HAPH TECHNOLOGIES CO.,LTD.
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Abstract

The invention provides an uplink resource allocation method in combination with PHR (Power Headroom Report) in an LTE (Long Term Evolution) system, which comprises the following steps that: after receiving the PHR reported by a terminal, a base station carries out smoothing processing on the obtained current downlink road loss estimated value of the terminal and the downlink road loss estimated value stored at the base station side. According to the invention, through carrying out smoothing processing on the downlink road loss estimated value of the terminal obtained from the PHR, the stability of reporting action of the PHR can be ensured, i.e., the stability of the uplink resource allocation is increased.

Description

In conjunction with the method that the ascending resource of PHR distributes in LTE system
Technical field
The present invention relates to a kind of method that in LTE system, ascending resource distributes, particularly relate in a kind of LTE system in conjunction with the method that the ascending resource of PHR distributes.
Background technology
LTE (Long Term Evolution, Long Term Evolution) in system, base station when giving terminal distribution ascending resource first based on uplink user ability height, uplink transmission data amount size, the up PUSCH(Physical Uplink Shared Channel of terminal, Physical Uplink Shared Channel) channel quality is fine or not etc., and factor forms multiple available resource set.Because LTE system adopts based on PSD(Power spectraldensity, power spectral density) uplink power control criterion, the total transmitted power of terminal changes along with the change of bandwidth when being no more than the maximum transmission power upper limit to realize MCS(Modulation andCoding Scheme, Modulation and Coding Scheme), coupling between the total transmitted power of bandwidth sum, therefore in the process choosing the available resource set meeting terminal most, the available resource set MCS transmitting power corresponding with bandwidth is compared by when being no more than the terminal transmit power upper limit in transmitting power in base station, the usable set chosen corresponding to maximum is optimal set.Detailed process is as follows:
According to agreement TS36.213 regulation, the PUSCH transmitting power of LTE terminal sub-frame of uplink i is determined by following formula:
P PUSCH(i)＝min{P CMAX,10log 10(M PUSCH(i))+P O_PUSCH(j)+α(j)·PL+Δ TF(i)+f(i)}[dBm]，
Formula 2.1
P cMAXbe the maximum transmission power allowed by UE (User Equipment, subscriber equipment or terminal), unit is dbm; M pUSCHi () is i-th subframe is the amount of bandwidth that PUSCH distributes, i.e. PRB number, and unit is individual; 10log 10(M pUSCH(i)) unit be dB; P o_PUSCHj () represents the expectation transmitting power of terminal, be the absolute magnitude in computing formula, unit is dbm; PL is the downlink path loss that UE measures, and unit is dB; Δ tFi () represents the power increment that the modulating-coding grade of i-th subframe is corresponding, unit is dB; F (i) is the exclusive correction value of UE, and unit is db.In a word, foregoing is as the criterion with agreement regulation.
P cMAXthe maximum transmission power allowed by terminal, M pUSCHi () is i-th subframe is the amount of bandwidth that PUSCH distributes, P o_PUSCH(j) be by interference noise normalization after expectation transmitting power, α (j) PL compensates the path loss in transmitting procedure, wherein α (j) is compensating factor, and j is the parameter in agreement TS36.213, characterize the type of service of current sub-frame of uplink, be divided into j=1 general service and the semi-continuous business of j=0, PL(Pathloss, path loss or path loss) be the descending path loss that terminal goes out according to descending reference sign estimation, Δ tFi () is the power back-off drawn according to efficiency of transmission, f (i) is that base station is based on the adjusted value of the upward signal quality of reception to terminal transmit power.If be greater than maximum permission transmitted power according to the uplink transmission power that each power control parameters and resource allocation result calculate, use maximum transmit power value sends by terminal.
For the transmitting power making base station know terminal, agreement TS36.321 prescribed terminal is at periodicPHR-Timer(Cyclical power headroom reporting timer) time-out or prohibitPHR-Timer(forbid power headroom reporting (PHR) timer) time-out simultaneously PL hop value more than the change of dl-PathlossChange(downlink path loss) after report PHR(PowerHeadroomReport, power headroom reporting (PHR)).PHR computing formula following (PH (i) is the power headroom of the i-th subframe):
PH (i)=P cMAX-{ 10log 10(M pUSCH(i))+P o_PUSCH(j)+α (j) PL+ Δ tF(i)+f (i) } formula 2.2
Based on the resource allocation parameters M of transmission PHR sub-frame of uplink pUSCH(i) and Δ tFthe expectation received power P of (i), high-rise configuration o_PUSCHj () is with path loss factor-alpha (j) and according to closed-loop power control pattern, add up the TPC(Transmission Power Control issued between current PHR and last PHR, transmitting power controls), base station also can obtain the descending path loss PL that end side calculates according to descending reference frequency pilot sign while obtaining PHR.Parameter relevant to Resourse Distribute in formula 2.1 is that ascending resource distributes bandwidth M pUSCH(i) and modulating-coding gain delta tF(i).At known P o_PUSCHj, when (), α (j) PL, f (i), base station is carrying out terminal to calculate resource allocation result M in real time according to formula 2.1 in new ascending resource assigning process pUSCH(i) and Δ tFi terminal transmit power that () is corresponding, and compare with the upper limit of emission power of this transmitting power and terminal and then obtain the maximum PRB(physical resource block that can get, Physical Resource Block) number and modulating-coding grade.
Report in process at PHR, the violent saltus step of descending path loss even PHR value itself is transmitted the descending circuit loss value that mistake can make base station obtain from PHR and does not mate with actual downstream circuit loss value, is specially:
If the PHR of terminal to report is comparatively large, the descending circuit loss value PL that base station obtains from PHR 1relative actual downstream circuit loss value PL 0too small, base station then thinks that the power headroom of Resourse Distribute is relatively many, and the PRB number of Resourse Distribute increases relative with modulating-coding grade, i.e. M pUSCH(i) and Δ tFi () value becomes large.Terminal at UL-GRANT(uplink Grant, uplink authorization) actual transmission power of corresponding subframe is 10log 10(M pUSCH(i))+P o_PUSCH(j)+α (j) PL 1+ Δ tF(i)+f (i), and base station end received power is 10log 10(M pUSCH(i))+P o_PUSCH(j)+α (j) (PL 1-PL 0)+Δ tFi the received power of ()+f (i), PUSCH will reduce relatively, because next PHR needs just can report after periodicPHR-Timer or prohibitPHR-Timer time-out, therefore uplink demodulation performance will receive impact before this.
If the PHR index value of terminal to report is less, the descending circuit loss value PL1 that base station obtains from PHR is excessive relative to actual downstream circuit loss value PL0, base station then thinks that the power headroom of Resourse Distribute is relatively less, and the PRB number of Resourse Distribute reduces relative with modulating-coding grade, i.e. M pUSCH(i) and Δ tFi () value diminishes.Because next PHR needs just can report after periodicPHR-Timer and prohibitPHR-Timer time-out, therefore uplink transmission data amount will receive impact before this.If get 1 in PRB number, under modulating-coding grade gets 0 situation, terminal transmit power P o_PUSCH(j)+α (j) PL+ Δ tFi ()+f (i) is still greater than P cMAX, then base station stops as this terminal distribution resource, and terminal cannot carry out any uplink service before again obtaining ascending resource by Stochastic accessing simultaneously.
To sum up, in LTE system, ascending resource distribution more effectively can be carried out in base station after acquisition terminal PUSCH transmitted power.Agreement TS36.321 prescribed terminal periodicPHR-Timer time-out or prohibitPHR-Timer overtime while PL hop value more than dl-PathlossChange after report PHR, report in process at PHR, the violent saltus step of descending path loss even PHR value itself is transmitted mistake and can causes following problem:
1, base station thinks that the power headroom of terminal is terminal distribution comparatively multiple resource comparatively greatly, and the actual emission power of terminal on each PRB is less than expects that transmitting power will cause uplink demodulation penalty.
2, base station is thought that the power headroom of terminal is less and is the less resource not even Resources allocation of terminal distribution.
Summary of the invention
The object of the present invention is to provide in conjunction with the method that the ascending resource of PHR distributes in a kind of LTE system, to solve the problem that the violent saltus step of descending path loss that exists in prior art or the error of transmission of PHR value cause.
In order to realize object of the present invention, the method of distributing in conjunction with the ascending resource of PHR in LTE system provided by the invention comprises the following steps: after receiving the PHR of terminal to report, and the descending circuit loss value that terminal current downlink path loss estimated value and the base station side of acquisition are preserved is done smoothing processing by base station.
According to a kind of preferred implementation of the method for distributing in conjunction with the ascending resource of PHR in above-mentioned LTE system, wherein, described smoothing process is: PL enb=(1-α) PL enb+ α PL cur, wherein, α is smoothing factor, PL on the left of equal sign enbfor the descending circuit loss value after smoothing processing, PL on the right side of equal sign enbfor the descending circuit loss value that current base station side is preserved, PL curfor current downlink circuit loss value.
According to a kind of preferred implementation of the method for distributing in conjunction with the ascending resource of PHR in above-mentioned LTE system, wherein, the descending circuit loss value PL that preserves before upgrading of base station enbwhile to PL enbjudge, if PL enbat interval [PL downThr, PL upThr] outside then by reprovision make periodicPHR-Timer and prohibitPHR-Timer shorten the cycle, PHR LongtCounter count value reset; Wherein, interval [PL downThr, PL upThr] in two threshold values respectively correspondence systems to the assignable maximum and minimum ascending resource block of terminal.
According to a kind of preferred implementation of the method for distributing in conjunction with the ascending resource of PHR in above-mentioned LTE system, wherein, the method shortening periodicPHR-Timer and the prohibitPHR-Timer cycle comprises: judge PL enband PL upThrsize, as PL enbbe greater than PL upThrthen make PL enbvalue is PL upThr, as PL enbbe less than PL downThrthen make PL enbvalue is PL downThr.
According to a kind of preferred implementation of the method for distributing in conjunction with the ascending resource of PHR in above-mentioned LTE system, wherein, the descending circuit loss value PL that preserves before upgrading of base station enbwhile to PL enbjudge, if PL enbat interval [PL downThr, PL upThr] within, then make PHR_LongtCounter count value add 1, and make periodicPHR-Timer and prohibitPHR-Timer extend the cycle by reprovision after PHR_LongtCounter count value is greater than PHR_LongPeriodThr.
According to a kind of preferred implementation of the method for distributing in conjunction with the ascending resource of PHR in above-mentioned LTE system, wherein, the scope of described smoothing factor α is 0< α <1.
According to a kind of preferred implementation of the method for distributing in conjunction with the ascending resource of PHR in above-mentioned LTE system, wherein, described smoothing factor α is 0.5.
The present invention, by the smoothing process of user equipment downlink path loss estimated value obtained from PHR, can ensure that PHR reports the stability of effect, also namely increases the stability that ascending resource distributes.
Accompanying drawing explanation
Fig. 1 is the FB(flow block) of the preferred embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.
Fig. 1 schematically illustrates the FB(flow block) of the preferred embodiment of the present invention, as shown in it, in step S100, after receiving the PHR of terminal to report, then as step S101, and the terminal current downlink path loss estimated value PL that base station obtains from PHR curthe descending circuit loss value of preserving with base station side does smoothing processing, and processing procedure is:
PL enb＝(1-α)·PL enb+α·PL cur，
Wherein α is smoothing factor, and 0< α <1, preferably, α gets 0.5, (1-α) PL enbin PL enbthe descending circuit loss value that current base station side is preserved, PL on the left of equal sign enbthe descending circuit loss value after smoothing processing, the descending circuit loss value that namely after smoothing processing, base station is preserved again.As step S103, after smoothing processing, the descending circuit loss value PL preserved before base station upgrades enb.Perform step S105, to this PL simultaneously enbjudge.First judge PL enbwhether at interval [PL downThr, PL upThr] outside, set up interval [PL downThr, PL upThr] in be to prevent PL curabrupt change, causes PL enbexcessive or too small, two threshold value PL upThr, PL downThrcorrespondence system is to the assignable maximum and minimum ascending resource block of terminal respectively.As step S123, if PL enbbe greater than PL upThr, then PL is made enbvalue is PL upThr, as step S107, if PL enbbe less than PL downThr, then PL is made enbvalue is PL downThr, then perform step S111 and S113: reprovision makes periodicPHR-Timer and prohibitPHR-Timer shorten the cycle, PHR_LongtCounter(long period jump on count device) and count value clearing.After judging through step S105 and S1L07, if TL enb[PL between PH district R downThr, PL upThr] within, then perform step S117:PHR_LongtCounter count value and add 1, and the judgement then performed as step S119, if PHR_LongtCounter count value is greater than PHR_LongPeriodThr(long period PHR jump on count threshold value), then perform step S121: make timer periodicPHR-Timer and prohibitPHR-Timer extend the cycle by reprovision.Step S113, step S119 be judged as NO with step S121 after, perform step S115: carry out ascending resource distribution.
To sum up, the present invention is by estimating that to the user equipment downlink path loss obtained from PHR the smoothing process of PL value is to guarantee the stability that ascending resource distributes, while, passes through when sudden change appears in this value to shorten the instantaneous value that periodicPHR-Timer and prohibitPHR-Timer duration follows the tracks of descending PL more timely, extends the duration of periodicPHR-Timer and prohibitPHR-Timer to reduce the expense controlling upstream data when descending path loss PL is comparatively steady.Therefore, the present invention can obtain multinomial beneficial effect, and such as, the present invention, by the smoothing process of user equipment downlink path loss estimated value obtained from terminal to report PHR, can increase the stability that ascending resource distributes; Based on the monitoring to terminal to report PHR, the duration of dynamic reprovision adjustment periodicPHR-Timer and prohibitPHR-Timer, can make PHR value more have real-time.In addition, the present invention is the extension of protocol realization, is easy to realize, and facilitates product up-gradation.
As known by the technical knowledge, the present invention can be realized by other the embodiment not departing from its Spirit Essence or essential feature.Therefore, above-mentioned disclosed embodiment, with regard to each side, all just illustrates, is not only.Within the scope of the present invention all or be all included in the invention being equal to the change in scope of the present invention.

Claims (4)

1. in LTE system in conjunction with the method that the ascending resource of PHR distributes, it is characterized in that, comprise the following steps:
After receiving the PHR of terminal to report, the descending circuit loss value that terminal current downlink path loss estimated value and the base station side of acquisition are preserved is done smoothing processing by base station;
The descending circuit loss value PL preserved before base station upgrades enb, simultaneously to PL enbjudge, if PL enbat interval [PL downThr, PL upThr] outside then by reprovision make periodicPHR-Timer and prohibitPHR-Timer shorten the cycle, PHR_LongtCounter count value reset;
If PL enbat interval [PL downThr, PL upThr] within, then make PHR_LongtCounter count value add 1, and make periodicPHR-Timer and prohibitPHR-Timer extend the cycle by reprovision after PHR_LongtCounter count value is greater than PHR_LongPeriodThr;
Wherein, interval [PL downThr, PL upThr] in two threshold values respectively correspondence systems to the assignable maximum and minimum ascending resource block of terminal;
Wherein, the method shortening periodicPHR-Timer and the prohibitPHR-Timer cycle comprises: judge PL enband PL upThrsize, as PL enbbe greater than PL upThrthen make PL enbvalue is PL upThr, as PL enbbe less than PL downThrthen make PL enbvalue is PL downThr.
2. in LTE system according to claim 1 in conjunction with the method that the ascending resource of PHR distributes, it is characterized in that,
Described smoothing process is:
PL enb＝(1-α)·PL enb+α·PL cur，
Wherein, α is smoothing factor, PL on the left of equal sign enbfor the descending circuit loss value after smoothing processing, PL on the right side of equal sign enbfor the descending circuit loss value that current base station side is preserved, PL curfor current downlink circuit loss value.
3. in LTE system according to claim 2 in conjunction with the method that the ascending resource of PHR distributes, it is characterized in that,
The scope of described smoothing factor α is 0< α <1.
4. in LTE system according to claim 3 in conjunction with the method that the ascending resource of PHR distributes, it is characterized in that,
Described smoothing factor α is 0.5.
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