CN104837189B - A kind of close-loop power control modification method based on lte-a system - Google Patents
A kind of close-loop power control modification method based on lte-a system Download PDFInfo
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Abstract
本发明公开了一种基于LTE‑A系统的闭环功率控制修正方法，计算用户与基站的之间的距离并估算路径损耗、阴影衰落及天线的相关增益；根据路径损耗确定相关的路径损耗补偿因子α；根据基站发送的公共参考信号及路径损耗，统计测量本小区所有UE的参考信号的接收功率RSRP；将小区划分为三个区域：UE位于优区，在原发射功率的基础上继续增大发射功率；UE位于中区，随着路径损耗的增大对路径损耗进行适当的补偿，即随着路径损耗的增加，发射功率逐渐增大；UE位于边缘区，在闭环功率的基础上对发射功率进行减小；根据上述修正因子，重新进行TPC命令的发送，根据UE所在区域选择发射功率。本发明兼顾了小区平均吞吐量、边缘用户吞吐量及对相邻小区的干扰三种因素。
The invention discloses a closed-loop power control correction method based on the LTE-A system, which calculates the distance between a user and a base station and estimates the path loss, shadow fading and the relative gain of the antenna; and determines the relative path loss compensation factor according to the path loss α; According to the common reference signal and path loss sent by the base station, the received power RSRP of the reference signals of all UEs in the cell is statistically measured; the cell is divided into three areas: the UE is located in the optimal area, and the transmission continues to increase on the basis of the original transmission power power; the UE is located in the middle area, and the path loss is properly compensated with the increase of the path loss, that is, the transmit power gradually increases with the increase of the path loss; the UE is located in the edge area, and the transmit power is calculated on the basis of the closed-loop power. Reduce; according to the above correction factor, send the TPC command again, and select the transmission power according to the area where the UE is located. The present invention takes into account three factors of cell average throughput, edge user throughput and interference to adjacent cells.
Description
Technical field
The present invention relates to LTE communication technical fields, more particularly to the power control algorithm in lte-a system.
Background technique
" mobile to change life ", with the development of mobile communication and issuing for 4G licence plate, 4G also gradually comes into the life of people
In work, the maximized superiority of high-throughput, low error rate, minimum interference, battery life of the technology is directly apparent in logical
During letter.These technical progress be unable to do without power control techniques, and no matter for base station or UE itself, power is all logical
The most important resource of frequency is only second to during letter, it is intended that it is communicated as far as possible with reasonable power, it is good in guarantee
While the communication quality and user experience got well, the saving of power consumption is carried out to greatest extent.
Although maximizing transmission power corresponds to maximum handling capacity, used since inter-cell interference will limit cell edge
The capacity of family handling capacity and whole system, meanwhile, if between the excessive subcarrier being likely to cause in SC-FDMA of transmission power just
The loss for the property handed over, this will cause a degree of frequency shift (FS), so as to cause intra-cell interference, so cannot increase function simply
Rate will determine the transmission power of UE according to the service quality QoS demand of UE.
Power control, essence are a kind of optimization methods, be exactly by sent on physical control channel certain instruction come
Conduct power is emitted with suitable size.One good power control strategy plays the role of following five aspect: first is that electrode compensation,
Shadow fading is influenced caused by communication link；Second is that enable eNodeB or UE with reasonable power transmission signal to
Guarantee good communication quality, to reduce the interference generated to neighboring community；Third is that improving Cell Edge User and entire system
The capacity of system；Fourth is that guaranteeing the transmission for carrying out data with alap power, so as to extend the service life of battery；Five
It is the dynamic range of receiving for adjusting receiver, this is because will lead to the subcarrier in SC-FDMA if dynamic range of receiving is excessive
Orthogonality is lost, to generate intra-cell interference.In power control process should as much as possible with higher control speed, compared with
Low delay of control come realize power control to interference, the influence to energy consumption.
Consider from real network angle, due to the use of OFDMA technology, the power of existing downlink is mainly using average
Power distribution method determines the transmission power of base station, and the power control of uplink is more complicated, uplink common at present
Road power control strategy is divided into two kinds: one is open Loop Power control OLPC；One is close-loop power control CLPC.The base of OLPC
Present principles are exactly foundation UE itself measured value transmission power is arranged；The basic principle of CLPC is that UE will carry out information to eNodeB
Feedback, that is to say, that the more accurate control information that UE can be issued according to eNodeB is come transmission power, so this function
The performance of rate controlling mechanism is more preferable, but also to occupy more channels, generate bigger time delay to send control signaling.
It is emulated by the power control strategy different to both the above, both discoveries have respective respectively in effect
Advantage and disadvantage are embodied in:
From the point of view of the above comparison result, in existing two kinds of power control schemes, cell average throughput and edge customer
Both handling capacities are shifting relationships, and it is that we are not intended to see that this, which is in communication process,.So proposing one kind more
Power control scheme well can carry out preferably compromise and tradeoff between cell average throughput and edge user throughput
It is necessary.Compared with existing power control scheme, the present invention has carried out to a certain degree the power control algorithm in agreement
Amendment, on the basis of original power control for varying environment, different zones UE use different transmission power controls
Scheme accomplished " because UE applies power ", and has taken into account cell average throughput, edge user throughput and to neighboring community
Three kinds of factors are interfered, a kind of novel power control scheme is proposed.
Summary of the invention
In conjunction with the above-mentioned prior art, the invention proposes a kind of close-loop power control modification method based on lte-a system,
Certain amendment and improvement are done on the basis of close-loop power control, it is intended to guarantee edge customer when using close-loop power control
Guarantee the size of cell average throughput while handling capacity improves and reduces the increase due to edge UE power and produce
Influence of the raw inter-cell interference for systematic entirety energy.
The invention proposes a kind of close-loop power control modification method based on lte-a system, this method includes following step
It is rapid:
Step 201, calculate user and base station the distance between and estimate the related of path loss, shadow fading and antenna
Gain；
Step 202 determines relevant path loss compensation factor α according to path loss；
Step 203, according to base station send public reference signal and path loss, the ginseng of all UE of this cell of statistical measurement
The reception power RSRP of signal is examined, and determines the value range (RSRP of RSRPmin, RSRPmax)；
Step 204, the thresholding RSRP for being located at which region for judgement UEth1And RSRPth2If step-lengthThen RSRPth2=RSRPmin+ l, RSRPth1=RSRPmax-l；According to two thresholding RSRPth1And
RSRPth2And the reception power RSRP of the reference signal of current UE itselfselfDetermine subdistrict position locating for current UE, then
Different power control schemes is used to the UE for being located at three kinds of different locations；Cell is divided into three areas according to two thresholdings
Domain, i.e. marginal zone, middle area and excellent area；
If step 205 meets RSRPself>RSRPth1, then the position UE is excellent area, on the basis of former transmission power
Continue to increase transmission power, incrementss are g* △RSRP, wherein g is reference power difference compensation factor, △RSRPTo improve closed power
Control modifying factor；
If step 206 meets RSRPth2<RSRPself<RSRPth1, then the position UE is middle area, is carried out to path loss
Compensation appropriate, i.e., with the increase of path loss, transmission power is gradually increased；
If step 207, RSRPself<RSRPth2When, it is determined that the position UE is marginal zone, on the basis of closed power
On the transmission power of this part UE is reduced, reduction step-length be g* | ΔRSRP|, promote the handling capacity of Cell Edge User；
The power of this part UE is reduced, slightly on the basis of close-loop power control to reduce the interference that it generates adjacent cell；
Step 208, according to the above-mentioned modifying factor added on the basis of close-loop power control, re-start transmission power control
The transmission of system order TPC, to select different transmission powers according to the region UE.
Modifying factor constant current journey really, comprising the following steps:
Step 301, range estimation path loss, the related gain of shadow fading and antenna for calculating user and base station；
Step 302, determine current neighboring community downlink public reference signal CRS carrier power；
Step 303, UE are according to the carrier power and correlative coupling of public reference signals all in current neighbor cell list
Loss determines the Reference Signal Received Power RSRP of all neighboring communitiesneighbour；
Step 304, from all RSRPneighbourSelect maximum value RSRPneighbor-max, determine and most strong jamming generated to oneself
Base station；
Step 305 determines that power control improves factor △RSRP, △RSRP=RSRPself- RSRPneighbor-max；
Step 306, when UE is located at excellent area, △RSRP> 0, increase the power of this part UE；When UE is located at marginal zone, take
△RSRPAbsolute value, this value is then subtracted on the basis of original close-loop power control, thus to the power of edge UE using first
The fine tuning reduced after increase has taken into account Inter-Cell Interference Coordination on the basis of guaranteeing cell edge user throughput.
Compared with existing power control scheme, the present invention has carried out the power control algorithm in agreement a degree of
Amendment, UE on the basis of original power control for varying environment, different zones use different transmission power control sides
Case, has accomplished " because UE applies power ", has taken into account cell average throughput, edge customer as a kind of novel power control scheme
Handling capacity and three kinds of factors of interference to neighboring community.
Detailed description of the invention
Fig. 1 is the close-loop power control schematic diagram of standard.
Fig. 2 is to improve close-loop power control flow chart.
Fig. 3 is to determine the flow chart for improving close-loop power control modifying factor.
Specific embodiment
In existing uplink power control strategy, as path loss compensation factor αcOne timing of value, with UE path loss
Increase, give path loss compensation it is more.That is when UE is located at center of housing estate, since its PL is relatively small,
So the power compensation for Cell Center User is also smaller, can similarly it obtain, when UE is located at cell edge, since its path is damaged
Consume it is relatively large, so the power compensation that opposite its obtains is also more.The strategy of this " high person faces upward it, and Sinking disorders should be treated with drugs of raising property " is right
For user, undoubtedly a kind of strategy that comparison is fair.But pass through emulation discovery, existing closed loop power control scheme ratio
Open loop power scheme averagely has 47.82% promotion in terms of cell edge user throughput, but this promotion is to sacrifice
24.66% cell average throughput is realized.So the present invention proposed for closed loop power control scheme it is a kind of new upper
Cell is divided into three kinds of different types by row power control strategy, respectively " excellent area ", " middle area ", " marginal zone ", to positioned at not
UE with region uses different transmission power strategies, realizes " because UE applies power ", thus at cell average throughput and edge
Compromise well is realized between user throughput.
Below in conjunction with the drawings and the specific embodiments, technical solution of the present invention is described in further detail.
According to the relevant regulations of agreement, the present invention is only in the PUSCH of uplink (Physical Uplink Shared Channel), PUCCH (physics
Uplink control channel), SRS (detection reference signal), carry out power control on the channels such as PRACH (random access channel).
PRACH before sending leading code when use open Loop Power control, PUSCH and PUCCH are close-loop power controls,
Because its course of work is all first one initial power control of setting, TPC command is then sent according to actual environment in the process again and (is tired out
Product type) carry out power adjusting, the purpose of SRS be carry out uplink signal-channel quality detection, so in order to save resource generally not
Hair.In a communications system, PUSCH carry data signals, RRC control signal superposed thereon and aperiodic CQI signaling, it is main
The transmission of user data is completed, if system bandwidth is 10MHz (50 RB), PUSCH need to account for 48 RB, it is seen that carry out to it
Corresponding power control directly determines the size of data throughout.It can be seen that power control is primarily referred to as the function to PUSCH
Rate control, since data transmission is carried out on PUSCH, so the research for PUSCH power control just seems especially heavy
It wants, directly decides the size and user experience of throughput of system.PUSCH power control formula specified in agreement TS36.213
Are as follows:
Unit is dBm, compensates part α by the path loss in formulac(j)·PLcAs can be seen that when path loss compensates
Factor-alphacOne timing of value, with the increase of UE path loss, the path loss compensation given is more.That is when UE
When center of housing estate, since its path loss PL is relatively small, so the power compensation for Cell Center User is also smaller, together
Li Ke get, when UE is located at cell edge, since its path loss is relatively large, so the power compensation that its opposite obtains
It is more, so the edge UE handling capacity that just will cause close-loop power control than open Loop Power control has a degree of promotion,
At the same time, since which give more power compensations, so it has also resulted in relatively bigger interference to adjacent cell.
RSRP (Reference Signal Receiving Power, Reference Signal Received Power) is to complete to measure by UE
An absolute value that can characterize received signal strength, can reflect distance of the mobile station apart from base station to a certain extent, because
This can be used to the downlink coverage rate of gauging system wireless network.To sum up, if UE to eNodeB distance is remoter, RSRP is smaller, road
Diameter loss is bigger, that is to say, that and RSRP is smaller to illustrate that transmission power at this time theoretically should be bigger closer to edge, certainly,
The transmission power of UE cannot the unconfined increase with the reduction of RSRP.
Cell is integrally divided into three parts, by users all in cell according to the RSRP value of its own i.e. according to measuring
Channel conditions be divided into three classes, i.e. " excellent area (center) ", " middle area ", " marginal zone " adopt the UE for being located at three kinds of different locations
With different power control schemes.Revised PUSCH transmission power control basic ideas are as follows:
Specific implementation step is as follows:
As shown in Figure 1, standard close-loop power control process the following steps are included:
Step 101: base station issues public reference signal according to average power allocation criterion, to UE in cell；
The Reference Signal Received Power that step 102:UE receives this is assessed；
Step 103:UE comments the pathloss conditions between base station and UE according to the Reference Signal Received Power received
Estimate, estimates the dependent loss between oneself present position and base station；
Step 104:UE carries out uplink power transmitting according to above-mentioned surveyed downlink path loss situation, as oneself
When path loss foundation, to be calculated according to agreement formula and determine oneself current transmission power；
Step 105: if open Loop Power control directly carries out the transmitting of power；If but closed power, then UE will be to base
One SRS detectable signal of transmission of standing is requested；
Step 106: base station assesses the signal SINR received according to this detectable signal, upper will be communicated to UE
The quality of row channel carries out certain assessment；
Step 107: base station sends TPC (transmission power control) order by PDCCH to UE according to the result of assessment；
Step 108:UE carries out the hair of power according to the rating formula of close-loop power control according to this TPC command
It penetrates, realizes communication.
Shown in Fig. 2, for the improved close-loop power control flow chart of the present invention, the process the following steps are included:
Step 201: calculate user and base station the distance between and estimate the related of path loss, shadow fading and antenna
Gain；
Step 202: relevant path loss compensation factor α is determined according to the size of path loss；
Step 203: simultaneously this cell of statistical measurement is all for public reference signal and the coupling loss estimation sent according to base station
The Reference Signal Received Power RSRP of UE, list and the value range (RSRP for determining this RSRPmin, RSRPmax)；
Step 204: determining thresholding to delimit the standard of subdistrict position locating for UE, that is, determine and determine which region UE is located at
Thresholding RSRPth1And RSRPth2.(the RSRP that the value is surveyed by this cellmin, RSRPmax) determine, this thresholding can also preparatory root
It is set according to empirical value.If step-lengthThen RSRPth2=RSRPmin+ l, RSRPth1=RSRPmax-l；Root
According to two of RSRP with reference to thresholding and the Reference Signal Received Power RSRP of current UE itselfselfIt is small locating for current UE to determine
Then zone position uses different power control schemes to the UE for being located at three kinds of different locations.We will be small according to two thresholdings
Zoning is divided into three regions, and specific division rule see the table below:
Step 205: if meeting RSRPself>RSRPth1, it is determined that the position UE is " excellent area (center) ", primary
It penetrates on the basis of power and continues to increase transmission power, incrementss are g* △RSRP, wherein g is reference power difference compensation factor, △RSRP
It will be determined in Fig. 3.The purpose for the arrangement is that the size in order to guarantee cell average throughput, because being located in this region
UE channel condition it is preferable, it is possible to emitted with relatively high power to guarantee the transmission of more data volume, while again due to distance
Other cells can ignore the interference that the increase of its power generates other cells farther out.
Step 206: if meeting RSRPth2<RSRPself<RSRPth1, it is determined that the position UE is " middle area ", this part UE
Position apart from base station and other cells is relatively placed in the middle, it is possible to according to agreement formula with the increase pair of path loss
Path loss carries out compensation appropriate, i.e., with the increase of path loss, transmission power is gradually increased.
Step 209: if RSRPself<RSRPth2When, it is determined that the position UE is " marginal zone ", in the base of closed power
Reduction appropriate is carried out to the transmission power of this part UE on plinth, reduction step-length is g* | ΔRSRP|.When due to close-loop power control
The transmission power of this part UE has obtained promotion appropriate, so as to cause the opposite open loop power of handling capacity of Cell Edge User
Control is promoted, but at the same time, the increase positioned at the power of the UE of cell edge certainly will can generate certain journey to adjacent cell
The interference of degree, so this Partial Power is slightly reduced on the basis of close-loop power control, it can be in cell edge UE handling capacity
On the basis of being promoted, its interference generated to adjacent cell is reduced.
Step 210: according to the above-mentioned modifying factor added on the basis of close-loop power control, re-starting TPC command
It sends, to select different transmission power schemes according to the region UE.
As shown in figure 3, to determine the flow chart for improving close-loop power control modifying factor, comprising the following steps:
Step 301: calculating range estimation path loss, the related gain of shadow fading and antenna of user and base station；
Step 302: determining the carrier power of the downlink public reference signal CRS of current neighboring community；
Step 303:UE is according to the carrier power and correlative coupling of public reference signals all in current neighbor cell list
Loss determines the Reference Signal Received Power RSRP of all neighboring communitiesneighbour；
Step 304: from all RSRPneighbourSelect maximum value RSRPneighbor-max, determine and most strong jamming generated to oneself
Base station；
Step 305: determining that power control improves factor △RSRP, △RSRP=RSRPself- RSRPneighbor-max。
Step 306: when UE is located at " excellent area (center) ", △ > 0, relatively far away from due to the position apart from neighboring community,
So interference will not be generated to adjacent cell by increasing the power of this part UE；When UE is located at " marginal zone ", △RSRPIt is positive and negative cannot
It determines, so the correctness in order to guarantee algorithm, we take absolute value to it, then subtract on the basis of original close-loop power control
This value is gone, to use the fine tuning of first increases and then decreases to the power of edge UE, is guaranteeing cell edge user throughput
On the basis of, take into account the Multiple factors such as Inter-Cell Interference Coordination.
Claims (2)
1. a kind of close-loop power control modification method based on lte-a system, which is characterized in that method includes the following steps:
Step 201, calculate user and base station the distance between and estimate that the related of path loss, shadow fading and antenna increases
Benefit；
Step 202 determines relevant path loss compensation factor α according to path loss；
Step 203, the public reference signal sent according to base station and path loss, the reference of all UE of this cell of statistical measurement are believed
Number reception power RSRP, and determine RSRP value range (RSRPmin, RSRPmax)；
Step 204, the thresholding RSRP for being located at which region for judgement UEth1And RSRPth2If step-lengthThen RSRPth2=RSRPmin+ l, RSRPth1=RSRPmax-l；According to two thresholding RSRPth1And
RSRPth2And the reception power RSRP of the reference signal of current UE itselfselfDetermine subdistrict position locating for current UE, then
Different power control schemes is used to the UE for being located at three kinds of different locations；Cell is divided into three areas according to two thresholdings
Domain, i.e. marginal zone, middle area and excellent area；
If step 205 meets RSRPself>RSRPth1, then the position UE is excellent area, continues to increase on the basis of former transmission power
Big transmission power, incrementss are g* △RSRP, wherein g is reference power difference compensation factor, △RSRPIt is repaired to improve close-loop power control
Positive divisor；
If step 206 meets RSRPth2<RSRPself<RSRPth1, then the position UE is middle area, and it is appropriate to carry out to path loss
Compensation, i.e., with the increase of path loss, transmission power is gradually increased；
If step 207, RSRPself<RSRPth2When, it is determined that the position UE is marginal zone, to this on the basis of closed power
The transmission power of part UE is reduced, and reduction step-length is g* | ΔRSRP|, promote the handling capacity of Cell Edge User；In closed loop
The power of this part UE is reduced on the basis of power control, slightly to reduce the interference that it generates adjacent cell；
Step 208, according to the above-mentioned modifying factor added on the basis of close-loop power control, re-start transmission power control life
The transmission of TPC is enabled, to select different transmission powers according to the region UE.
2. a kind of close-loop power control modification method based on lte-a system as described in claim 1, which is characterized in that institute
State modifying factor constant current journey really, comprising the following steps:
Step 301, range estimation path loss, the related gain of shadow fading and antenna for calculating user and base station；
Step 302, determine current neighboring community downlink public reference signal CRS carrier power；
Step 303, UE are lost according to the carrier power and correlative coupling of public reference signals all in current neighbor cell list
Determine the Reference Signal Received Power RSRP of all neighboring communitiesneighbour；
Step 304, from all RSRPneighbourSelect maximum value RSRPneighbor-max, determine and most strongly disturbing base generated to oneself
It stands；
Step 305 determines that power control improves factor △RSRP, △RSRP=RSRPself- RSRPneighbor-max；
Step 306, when UE is located at excellent area, △RSRP> 0, increase the power of this part UE；When UE is located at marginal zone, △ is takenRSRP
Absolute value, this value is then subtracted on the basis of original close-loop power control, thus to the power of edge UE using first increasing
The fine tuning reduced afterwards has taken into account Inter-Cell Interference Coordination on the basis of guaranteeing cell edge user throughput.
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| CN107566094A (en) * | 2016-06-30 | 2018-01-09 | 北京信威通信技术股份有限公司 | The method and device that a kind of data retransmit |
| CN107566095A (en) * | 2016-06-30 | 2018-01-09 | 北京信威通信技术股份有限公司 | The method and device that a kind of data retransmit |
| CN107645367A (en) * | 2016-07-22 | 2018-01-30 | 北京信威通信技术股份有限公司 | A kind of method and device of send feedback information |
| CN107360621B (en) * | 2017-07-31 | 2021-01-15 | 天津大学 | LTE-A uplink power control method based on RSRP measurement value |
| CN107666677B (en) * | 2017-08-23 | 2020-08-04 | 国家电网公司 | Shadow fading measurement method of power communication wireless private network |
| CN107548144B (en) * | 2017-10-23 | 2021-04-23 | 中国联合网络通信集团有限公司 | A method and device for downlink power control applied to NB-IoT |
| WO2019205046A1 (en) * | 2018-04-26 | 2019-10-31 | 华为技术有限公司 | Power adjustment method and related device |
| WO2021148031A1 (en) * | 2020-01-23 | 2021-07-29 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Transmission of reference signal for positioning |
| CN111901860B (en) * | 2020-07-06 | 2021-08-31 | 北京科技大学 | A kind of cellular user initial access power control method |
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