CN106817760B - Power distribution method and device - Google Patents
Power distribution method and device Download PDFInfo
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- CN106817760B CN106817760B CN201510865988.2A CN201510865988A CN106817760B CN 106817760 B CN106817760 B CN 106817760B CN 201510865988 A CN201510865988 A CN 201510865988A CN 106817760 B CN106817760 B CN 106817760B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
Abstract
The invention discloses a power distribution method, which comprises the following steps: acquiring the uplink Physical Resource Block (PRB) idle rate of each component carrier and the uplink transmission efficiency of User Equipment (UE) on each component carrier in the current detection period; determining the power allocation factor of the UE on each component carrier according to each uplink transmission efficiency and the uplink PRB idle rate corresponding to the uplink transmission efficiency; and determining and configuring the maximum transmitting power of the UE on each component carrier according to each power distribution factor and the total transmitting power of the UE. The invention also discloses a power distribution device. The invention can solve the problem of reduced working performance caused by power reduction of the UE.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a power allocation method and apparatus.
Background
In a Long Term Evolution (LTE) communication system supporting multiple carriers and an LTE-Advanced (LTE-a) communication system, User Equipment (UE) is indicated to perform uplink transmission on multiple CCs (Component carriers) at the same uplink subframe time in a CA (Carrier Aggregation) scenario, and since the total power of the UE is limited, the total transmit power calculated by the UE according to the power parameters indicated by each CC must exceed the maximum transmit power of the terminal in the CA scenario, which is more so due to the large coverage in macro-station models such as Massive MIMO. At this time, the UE needs to reduce the transmission power of the multiple CCs according to the protocol, so that the sum of the transmission powers of the multiple CCs does not exceed the maximum transmission power of the terminal. For example, LTE-a adopts a scheme of performing hierarchical power reduction according to channel types and transmitted information, and when multiple PUSCHs are simultaneously transmitted and the transmission power exceeds the maximum transmission power configured by the terminal, the transmission power of the multiple PUSCHs is reduced proportionally by multiplying the transmission power of the multiple PUSCHs by the same power reduction factor, so as to ensure that the uplink transmission power does not exceed the maximum transmission power configured by the terminal; if multiple PUSCHs and PUCCHs are simultaneously transmitted and the transmission power exceeds the maximum transmission power configured by the terminal, the transmission power of the PUCCH is firstly ensured, and then the transmission power of the multiple PUSCHs is reduced in an equal proportion by multiplying the transmission power of the multiple PUSCHs by the same power reduction factor, so that the uplink transmission power is ensured not to exceed the maximum transmission power configured by the terminal. However, after the UE reduces the transmission power on each CC according to the protocol, the scheduling result of each CC is no longer appropriate, the uplink packet error rate increases, and the uplink transmission efficiency, SRS demodulation performance, downlink beamforming and space division multiplexing performance, etc. are all seriously degraded.
Disclosure of Invention
The invention mainly aims to provide a power distribution method and a power distribution device, and aims to solve the problem of reduced working performance caused by power reduction of UE.
In order to achieve the above object, the present invention provides a power allocation method, including:
acquiring the uplink Physical Resource Block (PRB) idle rate of each component carrier and the uplink transmission efficiency of User Equipment (UE) on each component carrier in the current detection period;
determining the power allocation factor of the UE on each component carrier according to each uplink transmission efficiency and the uplink PRB idle rate corresponding to the uplink transmission efficiency;
and determining and configuring the maximum transmitting power of the UE on each component carrier according to each power distribution factor and the total transmitting power of the UE.
Preferably, the obtaining the uplink transmission efficiency of the UE in each component carrier in the current detection period includes:
measuring the SINR value of the UE on each component carrier, and receiving a Power Headroom Report (PHR) of the UE on each component carrier;
and determining the SINR value of the single PRB of the UE on each component carrier according to each SINR measured value and the PHR value carried by the corresponding PHR, and taking the SINR value of each single PRB as the uplink transmission efficiency of the UE on each component carrier.
Preferably, the step of determining the power allocation factor of the UE on each component carrier according to each uplink transmission efficiency and the uplink PRB idle rate corresponding to the uplink transmission efficiency includes:
calculating the product of each uplink transmission efficiency and the corresponding uplink PRB idle rate, and calculating the sum of each product;
and respectively taking the ratio of each product to the sum as the power distribution factor of the UE on each component carrier.
Preferably, before the step of determining and configuring the maximum transmit power of each component carrier for the UE according to each of the power allocation factors and the total transmit power of the UE, the method further includes:
obtaining and correcting each power distribution factor according to the service type of the UE on each component carrier;
and when the correction is completed, executing the step of determining and configuring the maximum transmission power of the UE in each component carrier for the UE according to each power allocation factor and the total transmission power of the UE.
Preferably, when receiving the PHR reported by the UE, the following steps are further performed:
smoothing the current downlink path loss value of the UE deduced by the corresponding PHR by adopting the saved downlink path loss value of the UE on each component carrier;
and storing each downlink loss value after the smoothing processing, and adjusting the detection period according to each downlink loss value after the smoothing processing.
Preferably, the power allocation method further includes:
and adjusting the detection period according to the uplink PRB idle rate of each component carrier in the current detection period.
Further, to achieve the above object, the present invention also provides a power distribution apparatus, including:
the acquisition module is used for acquiring the uplink Physical Resource Block (PRB) idle rate of each component carrier and the uplink transmission efficiency of User Equipment (UE) on each component carrier in the current detection period;
a determining module, configured to determine a power allocation factor of the UE on each component carrier according to each uplink transmission efficiency and an uplink PRB idle rate corresponding to the uplink transmission efficiency;
and the configuration module is used for determining and configuring the maximum transmitting power of the UE in each component carrier according to each power distribution factor and the total transmitting power of the UE.
Preferably, the obtaining module is further configured to measure a signal to interference plus noise ratio SINR value of the UE on each component carrier, and receive a power headroom report PHR of the UE on each component carrier, where the PHR is reported by the UE; and determining the SINR value of the single PRB of the UE on each component carrier according to each SINR measured value and the PHR value carried by the corresponding PHR, and taking the SINR value of each single PRB as the uplink transmission efficiency of the UE on each component carrier.
Preferably, the determining module is further configured to calculate a product of each uplink transmission efficiency and its corresponding uplink PRB idle rate, and calculate a sum of each product; and respectively taking the ratio of each product to the sum as the power allocation factor of the UE on each component carrier.
Preferably, the power allocation apparatus further includes a modification module, configured to obtain and modify each power allocation factor according to a service type of the UE in each component carrier;
and the configuration module is further used for determining and configuring the maximum transmission power of the UE in each component carrier according to each power allocation factor and the total transmission power of the UE when the correction is completed.
Preferably, the power allocation apparatus further includes a first adjusting module, configured to perform smoothing processing on a current downlink path loss value of the UE derived from the PHR corresponding to the stored downlink path loss value of the UE in each component carrier while receiving the PHR reported by the UE; and storing each downlink loss value after the smoothing processing, and adjusting the detection period according to each downlink loss value after the smoothing processing.
Preferably, the power allocation apparatus further includes a second adjusting module, configured to adjust the detection period according to an uplink PRB idle rate of each component carrier.
The power allocation method or device provided by the invention firstly determines the power allocation factors of the UE on each component carrier according to the uplink Physical Resource Block (PRB) idle rate of each component carrier in the current detection period and the uplink transmission efficiency of the UE on each component carrier, and then determines and configures the maximum transmission power of the UE on each component carrier according to each power allocation factor and the total transmission power of the UE, so that when the UE is scheduled among each component carrier, the sum of the expected transmission power of each component carrier does not exceed the actual total transmission power of the UE, namely, the situation of power limitation does not occur, and the power reduction is avoided, thereby solving the problem of working performance reduction caused by the power reduction of the UE.
Drawings
FIG. 1 is a schematic flow chart of a power allocation method according to a first embodiment of the present invention;
fig. 2 is a functional block diagram of a power distribution apparatus according to a first embodiment of the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The present invention provides a power allocation method, and referring to fig. 1, in a first embodiment of the power allocation method of the present invention, the power allocation method includes:
step S10, acquiring the uplink Physical Resource Block (PRB) idle rate of each component carrier and the uplink transmission efficiency of User Equipment (UE) on each component carrier in the current detection period;
the power allocation method provided in this embodiment may be applied to a base station in a communication system such as LTE (Long Term Evolution ) and LTE-a (LTE-Advanced, Long Term Evolution), for example, when the method is applied to a CA (Carrier Aggregation) enabled macro base station such as Massive MIMO, the base station configures uplink transmit power between component carriers for a UE (User Equipment) in advance, so that when the UE is scheduled on multiple component carriers at the same time, the transmit power of the multiple component carriers does not exceed the total transmit power, thereby avoiding the problem of reduced working performance caused by power reduction of the UE.
In this embodiment, when performing power allocation, first, the idle rate of an uplink PRB (Physical Resource Block, which is a basic unit for allocating air interface Physical resources) of each component carrier in a current detection period and the uplink transmission efficiency of the UE in each component carrier are obtained. Specifically, when the uplink transmission efficiency of the UE on each component carrier is obtained, a SINR (Signal Interference Plus Noise Ratio) value of the UE converted to a single PRB on each component carrier is calculated, and the SINR value of the single PRB of the UE on each component carrier is respectively used as the uplink transmission efficiency of the UE on each component carrier.
Here, the SINR value is a ratio of the strength of the received useful signal to the strength of the received interference signal (noise and interference), and may be simply understood as "signal-to-noise ratio". In practical engineering scenarios, especially in MIMO scenarios, it is not practical to estimate the channel matrix accurately and timely, and the feedback information is limited by the feedback channel, so that the feedback information is unlikely to be too much. Therefore, in the 3GPP proposal, SINR is generally adopted as feedback information and used as a control parameter for adaptive modulation.
Specifically, SINR initially occurs in multi-user detection, and it is assumed that there are two users 1 and 2, two signals of a transmitting antenna (CDMA (Code Division Multiple Access) are Orthogonal by using codes, and OFDM (Orthogonal Frequency Division Multiplexing) is Orthogonal by using spectrums, so as to distinguish different data sent to the two users), and user 1 receives data sent by the transmitting antenna itself, which is a useful Signal, and also receives data sent by the transmitting antenna to user 2, which is an Interference, and certainly, Noise.
When acquiring the uplink PRB idle rate of each component carrier, the uplink PRB idle rate of the component carrier CC1 is calculated.
In this embodiment, the number Ucc1 of uplink PRB usage of the CC1 in the current detection period and the number Tcc1 of uplink PRB usage of the CC1 are counted, and the ratio of (Tcc1-Ucc1) to Tcc1 is used as the idle rate of the uplink PRB of the CC 1.
Step S20, determining the power distribution factor of the UE on each component carrier according to each uplink transmission efficiency and the uplink PRB idle rate corresponding to the uplink transmission efficiency;
in this embodiment, after acquiring the uplink PRB idle rate of each component carrier and the uplink transmission efficiency of the UE on each component carrier, the power allocation factor of the UE on each component carrier is determined according to each uplink transmission efficiency and the uplink PRB idle rate corresponding to the uplink transmission efficiency.
Specifically, the product of each uplink transmission efficiency and the corresponding uplink PRB idle rate is calculated, and the sum of each product is calculated; and respectively taking the ratio of each product to the sum as the power distribution factor of the UE on each component carrier.
For example, the base station includes a primary component carrier PCC, two secondary component carriers SCC1 and SCC2, the base station acquires that uplink PRB idle rates of the SCC1, the SCC2, and the PCC are ulprbsage (1), ulprbsage (2), and ulprbsage (3), respectively, and acquires that uplink transmission efficiencies of the UE on the SCC1, the SCC2, and the PCC are NormalizedUlSinr (1), NormalizedUlSinr (2), and NormalizedUlSinr (3), respectively;
the power allocation factors of the UE in SCC1, SCC2, and PCC are respectively denoted as ScaleFactor (1), ScaleFactor (2), and ScaleFactor (3), then
ScaleFactor(1)＝ULPrbUsage(1)*NormalizedUlSinr(1)/(ULPrbUsage(1)*NormalizedUlSinr(1)+ULPrbUsage(2)*NormalizedUlSinr(2)+ULPrbUsage(3)*NormalizedUlSinr(3))；
ScaleFactor(2)＝ULPrbUsage(2)*NormalizedUlSinr(2)/(ULPrbUsage(1)*NormalizedUlSinr(1)+ULPrbUsage(2)*NormalizedUlSinr(2)+ULPrbUsage(3)*NormalizedUlSinr(3))；
ScaleFactor(3)＝ULPrbUsage(3)*NormalizedUlSinr(3)/(ULPrbUsage(1)*NormalizedUlSinr(1)+ULPrbUsage(2)*NormalizedUlSinr(2)+ULPrbUsage(3)*NormalizedUlSinr(3))。
Step S30, determining and configuring the maximum transmission power of the UE in each component carrier according to each power allocation factor and the total transmission power of the UE.
After determining the power distribution factors of the UE on each component carrier, determining and configuring the maximum transmission power of the UE on each component carrier according to each power distribution factor and the total transmission power of the UE.
For example, the Total transmission power of the UE is Pmcax _ Total, and the maximum transmission powers of the UE in SCC1, SCC2, and PCC are PmcaxOnCC (1), PmcaxOnCC (2), and PmcaxOnCC (3), respectively, then
PmcaxOnCC(1)＝Pmcax_Total*ScaleFactor(1)；
PmcaxOnCC(2)＝Pmcax_Total*ScaleFactor(2)；
PmcaxOnCC(3)＝Pmcax_Total*ScaleFactor(3)。
In this embodiment, after determining the maximum transmission power PmcaxOnCC (1), PmcaxOnCC (2), and PmcaxOnCC (3) of the UE in each component carrier, the PmcaxOnCC (1), PmcaxOnCC (2), and PmcaxOnCC (3) are sent to the UE through RRC (Radio Resource Control) reconfiguration signaling. After receiving the reconfiguration signaling, the UE resolves PmcaxOnCC (1), PmcaxOnCC (2), and PmcaxOnCC (3) carried by the reconfiguration signaling, and sets the maximum transmission power of the UE in SCC1, SCC2, and PCC to PmcaxOnCC (1), PmcaxOnCC (2), and PmcaxOnCC (3), respectively.
According to the power allocation method provided by the embodiment, firstly, the power allocation factors of the UE on each component carrier are determined according to the uplink Physical Resource Block (PRB) idle rate of each component carrier in the current detection period and the uplink transmission efficiency of the UE on each component carrier, and then the maximum transmission power of the UE on each component carrier is determined and configured for the UE according to each power allocation factor and the total transmission power of the UE, so that when the UE is scheduled among the component carriers, the sum of the expected transmission power of each component carrier does not exceed the actual total transmission power of the component carrier, namely, the situation of power limitation does not occur, and the power reduction is avoided, so that the problem of working performance reduction caused by the power reduction of the UE can be solved.
Further, based on the first embodiment, a second embodiment of the power allocation method of the present invention is provided, in this embodiment, the obtaining the uplink transmission efficiency of the UE on each component carrier in the current detection period in step S10 includes:
measuring SINR values of the UE on each component carrier, and receiving a power headroom report PHR of the UE on each component carrier, wherein the PHR is reported by the UE;
and determining the SINR value of the single PRB of the UE on each component carrier according to each SINR measured value and the PHR value carried by the corresponding PHR, and taking the SINR value of each single PRB as the uplink transmission efficiency of the UE on each component carrier.
In this embodiment, an SINR measurement value and a PHR value are used to determine an SINR value of a single PRB, and specifically, the SINR value of the UE on each component carrier is measured first, and a power headroom report PHR of the UE on each component carrier is received, which is reported by the UE; when the SINR measured value of the UE on each component carrier is obtained and the PHR reported by the UE on each component carrier is received, determining the SINR value of a single PRB of the UE on each component carrier according to each SINR measured value and the PHR value carried by the corresponding PHR, and taking the SINR value of each single PRB as the uplink transmission efficiency of the UE on each component carrier. The following description is given by taking an example of obtaining uplink transmission efficiency of the UE on the component carrier SCC 1.
Alternatively, the SINR value of a UE on a SCC1 for a single PRB (uplink transmission efficiency) is determined using the following formula
NormalizedUlSinr(1)＝SINR1+ΔSINR1+δ1；
Wherein, SINR1 represents the measured SINR of UE in SCC1, which includes the adjustment amount of AMC (Adaptive Modulation and Coding), Δ SINR1 represents the influence of bandwidth when measuring SINR1, δ 1 is the PHR value corresponding to SINR1, and
PmcaxOnCC (1) is the maximum transmission power of the UE in SCC1, PP_PUSCHFor the desired transmit power of the UE in SCC1, PP_PUSCH(i)＝10log10(M0)+Po_Pusch+αPL1+ΔTF(i) + f (i), M0 is the number of PRBs, P, that the UE needs to send currentlyP_PUSCHSetting power parameters for the base station for identifying the expected UE received power spectral density, where α is a smoothing factor, PL1 is the current downlink path loss value of the UE in SCC1, ΔTF(i) When the power control parameter DeltaMCS _ Enable is 1, the adjustment amount is based on MCS, when DeltaMCS _ Enable is 0, f (i) is closed-loop power controlThe value is 0 in the open loop power control, and i is the ith frame of the PUSCH (Physical Uplink Shared Channel).
Further, based on the first or second embodiment, a third embodiment of the power allocation method of the present invention is proposed, and in this embodiment, before the step S30, the method further includes:
and obtaining and correcting each power allocation factor according to the service type of the UE in each component carrier, and executing step S30 when the correction is completed.
As is well known, a base station carries various services of a UE, such as a VoIP voice service, a web page text service, an audio/video service, and the like, but when the UE transmits the services, the service type of the UE is often transparent to the base station, that is, the base station does not know the service type of the UE carried by the UE.
In this embodiment, in each detection period, the UE may push the service type information transmitted by the UE on each component carrier to the base station, or the base station may obtain the service type information transmitted by the UE on each component carrier from the core network.
And after the service type information of the UE on each component carrier is acquired, correcting each power distribution factor according to the service type of the UE on each component carrier. It should be noted that, in this embodiment, corresponding priorities are preset for different service types, and corresponding correction amounts are allocated to different service types according to the priorities, for example, for a VoIP voice service, a web page text service, and an audio/video service, the priority of the VoIP voice service is the highest, the priority of the audio/video service is the next, and the priority of the web page text service is the lowest. To put it differently, the modification of each power allocation factor in this embodiment is to increase the power allocation factor corresponding to the component carrier where the service with the high priority is located, and correspondingly decrease the power allocation factor corresponding to the component carrier where the service with the low priority is located.
The following description will be given by taking the current services transmitted by the UE in SCC1, SCC2, and PCC as VoIP voice service, web page text service, and audio/video service, respectively:
after determining the power allocation factors of the UE on each component carrier according to each uplink transmission efficiency and the uplink PRB idle rate corresponding to the uplink transmission efficiency, identifying that the services transmitted by the UE on SCC1, SCC2 and PCC are respectively VoIP voice service, web page text service and audio-video service as examples, acquiring the correction quantities corresponding to each power allocation factor according to the priority relationship of each service as CorrtOnCC (1), CorrtOnCC (2) and CorrtOnCC (3), wherein,
CorrtOnCC(1)＝+10％(ULPrbUsage(1)*NormalizedUlSinr(1)+ULPrbUsage(2)*NormalizedUlSinr(2)+ULPrbUsage(3)*NormalizedUlSinr(3))；
CorrtOnCC(2)＝-6％(ULPrbUsage(1)*NormalizedUlSinr(1)+ULPrbUsage(2)*NormalizedUlSinr(2)+ULPrbUsage(3)*NormalizedUlSinr(3))；
CorrtOnCC(3)＝-4％(ULPrbUsage(1)*NormalizedUlSinr(1)+ULPrbUsage(2)*NormalizedUlSinr(2)+ULPrbUsage(3)*NormalizedUlSinr(3))；
the corrected power allocation factors are respectively:
ScaleFactor(1)’＝ScaleFactor(1)+CorrtOnCC(1)；
ScaleFactor(2)’＝ScaleFactor(2)+CorrtOnCC(2)；
ScaleFactor(3)’＝ScaleFactor(3)+CorrtOnCC(3)；
in this embodiment, after completing the correction of each power allocation factor, the UE is allocated with the corrected power allocation factors to the maximum transmission power of each component carrier, that is, the UE is allocated with the corrected power allocation factors
PmcaxOnCC(1)＝Pmcax_Total*ScaleFactor(1)’；
PmcaxOnCC(2)＝Pmcax_Total*ScaleFactor(2)’；
PmcaxOnCC(3)＝Pmcax_Total*ScaleFactor(3)’。
The allocation strategy of this embodiment not only considers the uplink PRB idle rate of each component carrier and the transmission efficiency of the UE on each component carrier, but also considers the service type of the UE on each component carrier, and can improve the communication efficiency of the entire communication system.
Further, based on the second embodiment, a fourth embodiment of the power allocation method of the present invention is provided, and in this embodiment, while receiving the PHR reported by the UE, the following steps are further performed:
smoothing the current downlink path loss value of the UE deduced by the corresponding PHR by adopting the saved downlink path loss value of the UE on each component carrier;
and storing each downlink loss value after the smoothing processing, and adjusting the detection period according to each downlink loss value after the smoothing processing.
As will be understood by those skilled in the art, in an actual engineering scenario, wireless communication is affected by various factors and dynamically changes, which obviously does not meet practical requirements if the detection period of power allocation is kept inconvenient, and therefore, the present embodiment provides an alternative adjustment scheme for the detection period.
Specifically, when receiving the PHR reported by the UE, this embodiment not only obtains the PHR value carried by the PHR, but also derives the current downlink path loss value of the UE on each component carrier according to each PHR, and respectively smoothes each corresponding current downlink path loss value by using the stored downlink path loss value of the UE on each component carrier, where the following formula is shown:
PLj＝(1-α)*PLj+α*PLcurr(j)；
the PLj on the left side of the formula represents the downlink loss value after the smoothing processing, the PLj on the right side of the formula represents the stored downlink loss value, PLcurr represents the current downlink loss value, j represents different component carriers, α represents a smoothing factor, and the value range is [0,1], for example, α is 0.5 in this embodiment.
After the smoothing process is completed, the smoothed PLj is judged,
wherein, PLjminAnd PLjmaxRespectively representing a low downlink path loss threshold and a high downlink path loss threshold used for adjusting the detection period on the corresponding component carrier.
If it is
If the detection period is larger than zero, the detection period is shortened, and the adjusted detection period cannot be smaller than the minimum detection period; if it is
Keeping the detection period if the value is equal to zero; if it is
And if the detection period is less than zero, the detection period is prolonged, and the adjusted detection period cannot be greater than the maximum detection period.
It should be noted that the adjustment amount of the detection period and the minimum and maximum values of the detection period can be set as required, for example, the embodiment sets the adjustment amount to 5 seconds, i.e., the detection period is extended or shortened by 5 seconds each time the detection period is adjusted.
In this embodiment, the detection period is correspondingly adjusted according to the downlink path loss value reported by the UE, so that the stability of power allocation can be increased.
Further, based on the first or second embodiment, a fifth embodiment of the power allocation method of the present invention is provided, and in this embodiment, the power allocation method further includes:
and adjusting the detection period according to the uplink PRB idle rate of each component carrier in the current detection period.
To increase the stability of power allocation, the present embodiment proposes another adjustment scheme for optionally detecting the period. Specifically, when acquiring the uplink PRB idle rate of each component carrier in the current detection period, this embodiment not only performs power allocation for the UE based on each uplink PRB idle rate (specifically, refer to the foregoing embodiment, and are not described here again), but also performs statistics on each uplink PRB idle rate, and determines whether to adjust the detection period according to a result of the statistics, where the following formula is shown:
where k denotes different component carriers, RbUsagekminAnd RbUsagekmaxRespectively representing the minimum PRB utilization rate and the maximum PRB utilization rate used for adjusting the detection period on the corresponding component carrier.
If it is
If the detection period is larger than zero, the detection period is shortened, and the adjusted detection period cannot be smaller than the minimum detection period; if it is
Keeping the detection period if the value is equal to zero; if it is
And if the detection period is less than zero, the detection period is prolonged, and the adjusted detection period cannot be greater than the maximum detection period.
It should be noted that the adjustment amount of the detection period and the minimum and maximum values of the detection period can be set as required, for example, the embodiment sets the adjustment amount to 5 seconds, i.e., the detection period is extended or shortened by 5 seconds each time the detection period is adjusted.
The present invention also provides a power distribution apparatus, and referring to fig. 2, in a first embodiment of the power distribution apparatus of the present invention, the power distribution apparatus includes:
an obtaining module 10, configured to obtain an uplink physical resource block PRB idle rate of each component carrier in a current detection period and an uplink transmission efficiency of a user equipment UE in each component carrier;
the power distribution apparatus provided in this embodiment may be applied to a base station in a communication system such as LTE (Long Term Evolution ) and LTE-a (LTE-Advanced, Long Term Evolution-Advanced), for example, when being applied to a CA (Carrier Aggregation) enabled macro base station such as Massive MIMO, the power distribution apparatus is built in the base station to operate, so that the base station configures uplink transmit power between component carriers for a UE (User Equipment) in advance, so that when the UE schedules on multiple component carriers at the same time, the transmit power of the multiple component carriers does not exceed the total transmit power, thereby avoiding a problem that the UE reduces power to cause a decrease in working performance.
In this embodiment, when performing power allocation, first, the obtaining module 10 obtains an uplink PRB (Physical Resource Block, which is a basic unit for allocating air interface Physical resources) idle rate of each component carrier in a current detection period and uplink transmission efficiency of the UE on each component carrier. Specifically, when acquiring the uplink transmission efficiency of the UE on each component carrier, the acquiring module 10 calculates a SINR (Signal Interference Plus Noise Ratio) value converted to a single PRB by the UE on each component carrier, and takes the SINR value of the single PRB by the UE on each component carrier as the uplink transmission efficiency of the UE on each component carrier.
Here, the SINR value is a ratio of the strength of the received useful signal to the strength of the received interference signal (noise and interference), and may be simply understood as "signal-to-noise ratio". In practical engineering scenarios, especially in MIMO scenarios, it is not practical to estimate the channel matrix accurately and timely, and the feedback information is limited by the feedback channel, so that the feedback information is unlikely to be too much. Therefore, in the 3GPP proposal, SINR is generally adopted as feedback information and used as a control parameter for adaptive modulation.
Specifically, SINR initially occurs in multi-user detection, and it is assumed that there are two users 1 and 2, two signals of a transmitting antenna (CDMA (Code Division Multiple Access) are Orthogonal by using codes, and OFDM (Orthogonal Frequency Division Multiplexing) is Orthogonal by using spectrums, so as to distinguish different data sent to the two users), and user 1 receives data sent by the transmitting antenna itself, which is a useful Signal, and also receives data sent by the transmitting antenna to user 2, which is an Interference, and certainly, Noise.
When the obtaining module 10 obtains the uplink PRB idle rate of each component carrier, it is described to calculate the uplink PRB idle rate of the component carrier CC 1.
In this embodiment, the obtaining module 10 counts the number Ucc1 of uplink PRB usage of the CC1 in the current detection period and counts the number Tcc1 of uplink PRB usage of the CC1, and takes the ratio of (Tcc1-Ucc1) to Tcc1 as the idle rate of uplink PRB of the CC 1.
A determining module 20, configured to determine a power allocation factor of the UE on each component carrier according to each uplink transmission efficiency and an uplink PRB idle rate corresponding to the uplink transmission efficiency;
in this embodiment, after the obtaining module 10 obtains the uplink PRB idle rates of the component carriers and the uplink transmission efficiencies of the UEs in the component carriers, the determining module 20 determines the power allocation factors of the UEs in the component carriers according to the uplink transmission efficiencies and the uplink PRB idle rates corresponding to the uplink transmission efficiencies.
Specifically, the determining module 20 calculates a product of each uplink transmission efficiency and the uplink PRB idle rate corresponding thereto, calculates a sum of each product, and takes a ratio of each product to the sum as a power allocation factor of the UE on each component carrier.
For example, the base station includes a primary component carrier PCC, two secondary component carriers SCC1 and SCC2, the obtaining module 10 obtains that uplink PRB idle rates of the SCC1, the SCC2, and the PCC are ulprbsage (1), ulprbsage (2), and ulprbsage (3), respectively, and obtains that uplink transmission efficiencies of the UE on the SCC1, the SCC2, and the PCC are NormalizedUlSinr (1), NormalizedUlSinr (2), and NormalizedUlSinr (3), respectively;
the power allocation factors of the UE in SCC1, SCC2, and PCC are respectively denoted as ScaleFactor (1), ScaleFactor (2), and ScaleFactor (3), then
ScaleFactor(1)＝ULPrbUsage(1)*NormalizedUlSinr(1)/(ULPrbUsage(1)*NormalizedUlSinr(1)+ULPrbUsage(2)*NormalizedUlSinr(2)+ULPrbUsage(3)*NormalizedUlSinr(3))；
ScaleFactor(2)＝ULPrbUsage(2)*NormalizedUlSinr(2)/(ULPrbUsage(1)*NormalizedUlSinr(1)+ULPrbUsage(2)*NormalizedUlSinr(2)+ULPrbUsage(3)*NormalizedUlSinr(3))；
ScaleFactor(3)＝ULPrbUsage(3)*NormalizedUlSinr(3)/(ULPrbUsage(1)*NormalizedUlSinr(1)+ULPrbUsage(2)*NormalizedUlSinr(2)+ULPrbUsage(3)*NormalizedUlSinr(3))。
A configuration module 30, configured to determine and configure the maximum transmit power of the UE in each component carrier according to each power allocation factor and the total transmit power of the UE.
After the determining module 20 determines the power allocation factors of the UE on each component carrier, the configuring module 30 determines and configures the maximum transmit power of the UE on each component carrier according to each power allocation factor and the total transmit power of the UE.
For example, the Total transmission power of the UE is Pmcax _ Total, and the maximum transmission powers of the UE in SCC1, SCC2, and PCC are PmcaxOnCC (1), PmcaxOnCC (2), and PmcaxOnCC (3), respectively, then
PmcaxOnCC(1)＝Pmcax_Total*ScaleFactor(1)；
PmcaxOnCC(2)＝Pmcax_Total*ScaleFactor(2)；
PmcaxOnCC(3)＝Pmcax_Total*ScaleFactor(3)。
In this embodiment, after determining the maximum transmission power PmcaxOnCC (1), PmcaxOnCC (2), and PmcaxOnCC (3) of the UE in each component carrier, the configuration module 30 sends the PmcaxOnCC (1), PmcaxOnCC (2), and PmcaxOnCC (3) to the UE through Radio Resource Control (RRC) reconfiguration signaling. After receiving the reconfiguration signaling, the UE resolves PmcaxOnCC (1), PmcaxOnCC (2), and PmcaxOnCC (3) carried by the reconfiguration signaling, and sets the maximum transmission power of the UE in SCC1, SCC2, and PCC to PmcaxOnCC (1), PmcaxOnCC (2), and PmcaxOnCC (3), respectively.
The power allocation apparatus provided in this embodiment determines power allocation factors of the UE in each component carrier according to an uplink physical resource block PRB idle rate of each component carrier in a current detection period and an uplink transmission efficiency of the UE in each component carrier, and then determines and configures a maximum transmission power of the UE in each component carrier according to each power allocation factor and a total transmission power of the UE, so that when the UE is scheduled among the component carriers, a sum of expected transmission powers of the component carriers does not exceed an actual total transmission power of the component carriers, that is, a power limitation condition does not occur, and power reduction is avoided.
Further, based on the first embodiment, a second embodiment of the power allocation apparatus of the present invention is provided, in this embodiment, the obtaining module 10 is further configured to measure a signal to interference and noise ratio SINR value of the UE on each component carrier, and receive a power headroom report PHR of the UE on each component carrier, where the power headroom report PHR is reported by the UE; and determining the SINR value of the single PRB of the UE on each component carrier according to each SINR measured value and the PHR value carried by the corresponding PHR, and taking the SINR value of each single PRB as the uplink transmission efficiency of the UE on each component carrier.
In this embodiment, the obtaining module 10 determines the SINR value of a single PRB by using the SINR measurement value and the PHR value, specifically, the obtaining module 10 first measures the SINR value of the UE on each component carrier, and receives a power headroom report PHR of the UE on each component carrier, which is reported by the UE; when the SINR measurement value of the UE on each component carrier is obtained and the PHR reported by the UE on the power headroom report of each component carrier is received, the obtaining module 10 determines the SINR value of the single PRB of the UE on each component carrier according to each SINR measurement value and the PHR value carried by the PHR corresponding to the SINR measurement value, and uses the SINR value of each single PRB as the uplink transmission efficiency of the UE on each component carrier. The following description will take the example that the obtaining module 10 obtains the uplink transmission efficiency of the UE on the component carrier SCC 1.
Alternatively, the SINR value of a UE on a SCC1 for a single PRB (uplink transmission efficiency) is determined using the following formula
NormalizedUlSinr(1)＝SINR1+ΔSINR1+δ1；
Wherein, SINR1 represents the measured SINR of UE in SCC1, which includes the adjustment amount of AMC (Adaptive Modulation and Coding), Δ SINR1 represents the influence of bandwidth when measuring SINR1, δ 1 is the PHR value corresponding to SINR1, and
Further, based on the first or second embodiment, a third embodiment of the power allocation apparatus of the present invention is provided, in this embodiment, the power allocation apparatus further includes a modification module, configured to obtain and modify each power allocation factor according to a service type of the UE in each component carrier;
and the configuration module is further used for determining and configuring the maximum transmission power of the UE in each component carrier according to each power allocation factor and the total transmission power of the UE when the correction is completed.
As is well known, a base station carries various services of a UE, such as a VoIP voice service, a web page text service, an audio/video service, and the like, but when the UE transmits the services, the service type of the UE is often transparent to the base station, that is, the base station does not know the service type of the UE carried by the UE.
In this embodiment, in each detection period, the UE may push the service type information transmitted by the UE in each component carrier to a base station (a modification module), or the modification module acquires the service type information transmitted by the UE in each component carrier from a core network.
After the service type information of the UE on each component carrier is acquired, the correction module corrects each power allocation factor according to the service type of the UE on each component carrier. It should be noted that, in this embodiment, corresponding priorities are preset for different service types, and corresponding correction amounts are allocated to different service types according to the priorities, for example, for a VoIP voice service, a web page text service, and an audio/video service, the priority of the VoIP voice service is the highest, the priority of the audio/video service is the next, and the priority of the web page text service is the lowest. Vividly, the modification of each power allocation factor by the modification module is to increase the power allocation factor corresponding to the component carrier where the service with the high priority is located, and correspondingly decrease the power allocation factor corresponding to the component carrier where the service with the low priority is located.
The following description will be given by taking the current services transmitted by the UE in SCC1, SCC2, and PCC as VoIP voice service, web page text service, and audio/video service, respectively:
after the determining module 20 determines the power allocation factors of the UE on each component carrier according to each uplink transmission efficiency and the uplink PRB idle rate corresponding to the uplink transmission efficiency, the correcting module identifies that the services transmitted by the UE in the SCC1, the SCC2, and the PCC are respectively the VoIP voice service, the netpage text service, and the audio video service as examples, and obtains the correction amounts corresponding to each power allocation factor according to the priority relationship of the services as CorrtOnCC (1), CorrtOnCC (2), and CorrtOnCC (3), wherein,
CorrtOnCC(1)＝+10％(ULPrbUsage(1)*NormalizedUlSinr(1)+ULPrbUsage(2)*NormalizedUlSinr(2)+ULPrbUsage(3)*NormalizedUlSinr(3))；
CorrtOnCC(2)＝-6％(ULPrbUsage(1)*NormalizedUlSinr(1)+ULPrbUsage(2)*NormalizedUlSinr(2)+ULPrbUsage(3)*NormalizedUlSinr(3))；
CorrtOnCC(3)＝-4％(ULPrbUsage(1)*NormalizedUlSinr(1)+ULPrbUsage(2)*NormalizedUlSinr(2)+ULPrbUsage(3)*NormalizedUlSinr(3))；
the corrected power allocation factors are respectively:
ScaleFactor(1)’＝ScaleFactor(1)+CorrtOnCC(1)；
ScaleFactor(2)’＝ScaleFactor(2)+CorrtOnCC(2)；
ScaleFactor(3)’＝ScaleFactor(3)+CorrtOnCC(3)；
in this embodiment, after the modification module completes the modification of each power allocation factor, the configuration module 30 uses each modified power allocation factor to respectively allocate the maximum transmission power of the UE in each component carrier, that is, to allocate the maximum transmission power of the UE in each component carrier
PmcaxOnCC(1)＝Pmcax_Total*ScaleFactor(1)’；
PmcaxOnCC(2)＝Pmcax_Total*ScaleFactor(2)’；
PmcaxOnCC(3)＝Pmcax_Total*ScaleFactor(3)’。
The allocation strategy of this embodiment not only considers the uplink PRB idle rate of each component carrier and the transmission efficiency of the UE on each component carrier, but also considers the service type of the UE on each component carrier, and can improve the communication efficiency of the entire communication system.
Further, based on the second embodiment, a fourth embodiment of the power allocation apparatus of the present invention is provided, where in this embodiment, the power allocation apparatus further includes a first adjusting module, configured to, while receiving the PHR reported by the UE, adopt the stored downlink path loss values of the UE on each component carrier, and respectively smooth a current downlink path loss value of the UE derived from the PHR corresponding to the UE; and storing each downlink loss value after the smoothing processing, and adjusting the detection period according to each downlink loss value after the smoothing processing.
As will be understood by those skilled in the art, in an actual engineering scenario, wireless communication is affected by various factors and dynamically changes, which obviously does not meet practical requirements if the detection period of power allocation is kept inconvenient, and therefore, the present embodiment provides an alternative adjustment scheme for the detection period.
Specifically, when receiving the PHR reported by the UE, not only the determining module 10 obtains the PHR value carried by the PHR, but also the first adjusting module deduces the current downlink path loss value of the UE on each component carrier according to each PHR, and respectively smoothes each corresponding current downlink path loss value by using the stored downlink path loss value of the UE on each component carrier, where the formula is as follows:
PLj＝(1-α)*PLj+α*PLcurr(j)；
the PLj on the left side of the formula represents the downlink loss value after the smoothing processing, the PLj on the right side of the formula represents the stored downlink loss value, PLcurr represents the current downlink loss value, j represents different component carriers, α represents a smoothing factor, and the value range is [0,1], for example, α is 0.5 in this embodiment.
After the smoothing processing is finished, the first adjusting module judges the PLj after the smoothing processing,
wherein, PLjminAnd PLjmaxRespectively representing a low downlink path loss threshold and a high downlink path loss threshold used for adjusting the detection period on the corresponding component carrier.
If it is
If the detection period is larger than zero, the first adjusting module shortens the detection period, and the adjusted detection period cannot be smaller than the minimum detection period; if it is
If the value is equal to zero, the first adjusting module keeps the detection period; if it is
And if the detection period is less than zero, the first adjusting module prolongs the detection period, and the adjusted detection period cannot be larger than the maximum detection period.
It should be noted that the adjustment amount of the detection period and the minimum value and the maximum value of the detection period may be set according to actual needs, for example, the adjustment amount is set to 5 seconds in this embodiment, that is, the first adjustment module extends or shortens the detection period by 5 seconds each time the detection period is adjusted.
In this embodiment, the detection period is correspondingly adjusted according to the downlink path loss value reported by the UE, so that the stability of power allocation can be increased.
Further, based on the first or second embodiment, a fifth embodiment of the power allocation apparatus of the present invention is provided, and in this embodiment, the power allocation apparatus further includes a second adjusting module, configured to adjust the detection period according to an uplink PRB idle rate of each component carrier in a current detection period.
To increase the stability of power allocation, the present embodiment proposes another adjustment scheme for optionally detecting the period. Specifically, when acquiring the uplink PRB idle rate of each component carrier in the current detection period, this embodiment not only performs power allocation for the UE based on each uplink PRB idle rate (specifically, refer to the foregoing embodiment, and are not described here again), but also performs statistics on each uplink PRB idle rate, and determines whether to adjust the detection period according to a result of the statistics, where the following formula is shown:
where k denotes different component carriers, RbUsagekminAnd RbUsagekmaxRespectively representing the minimum PRB utilization rate and the maximum PRB utilization rate of the UE on the corresponding component carrier for adjusting the detection period.
If it is
If the detection period is larger than zero, the second adjusting module shortens the detection period, and the adjusted detection period cannot be smaller than the minimum detection period; if it is
If the value is equal to zero, the second adjusting module keeps the detection period; if it is
And if the detection period is less than zero, the second adjusting module prolongs the detection period, and the adjusted detection period cannot be larger than the maximum detection period.
It should be noted that the adjustment amount of the detection period and the minimum value and the maximum value of the detection period may be set according to actual needs, for example, the adjustment amount is set to 5 seconds in this embodiment, that is, the second adjustment module extends or shortens the detection period by 5 seconds each time the detection period is adjusted.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method of power allocation, the method comprising:
acquiring the uplink Physical Resource Block (PRB) idle rate of each component carrier and the uplink transmission efficiency of User Equipment (UE) on each component carrier in the current detection period;
determining the power allocation factor of the UE on each component carrier according to each uplink transmission efficiency and the uplink PRB idle rate corresponding to the uplink transmission efficiency;
determining and configuring the maximum transmitting power of the UE on each component carrier according to each power distribution factor and the total transmitting power of the UE;
wherein, the obtaining the uplink transmission efficiency of the UE on each component carrier in the current detection period includes:
measuring the SINR value of the UE on each component carrier, and receiving a Power Headroom Report (PHR) of the UE on each component carrier;
and determining the SINR value of the single PRB of the UE on each component carrier according to each SINR measured value and the PHR value carried by the corresponding PHR, and taking the SINR value of each single PRB as the uplink transmission efficiency of the UE on each component carrier.
2. The power allocation method according to claim 1, wherein the step of determining the power allocation factor of the UE on each component carrier according to each uplink transmission efficiency and its corresponding uplink PRB idle rate comprises:
calculating the product of each uplink transmission efficiency and the corresponding uplink PRB idle rate, and calculating the sum of each product;
and respectively taking the ratio of each product to the sum as the power distribution factor of the UE on each component carrier.
3. The power allocation method according to claim 1, wherein the step of determining and configuring the maximum transmit power for each component carrier for the UE according to each of the power allocation factors and the total transmit power of the UE further comprises:
obtaining and correcting each power distribution factor according to the service type of the UE on each component carrier;
and when the correction is completed, executing the step of determining and configuring the maximum transmission power of the UE in each component carrier for the UE according to each power allocation factor and the total transmission power of the UE.
4. The power allocation method according to claim 1, wherein the following steps are further performed while receiving the PHR reported by the UE:
smoothing the current downlink path loss value of the UE deduced by the corresponding PHR by adopting the saved downlink path loss value of the UE on each component carrier;
and storing each downlink loss value after the smoothing processing, and adjusting the detection period according to each downlink loss value after the smoothing processing.
5. The power allocation method of claim 1, wherein the power allocation method further comprises:
and adjusting the detection period according to the uplink PRB idle rate of each component carrier in the current detection period.
6. A power distribution apparatus, characterized in that the power distribution apparatus comprises:
the acquisition module is used for acquiring the uplink Physical Resource Block (PRB) idle rate of each component carrier and the uplink transmission efficiency of User Equipment (UE) on each component carrier in the current detection period;
a determining module, configured to determine a power allocation factor of the UE on each component carrier according to each uplink transmission efficiency and an uplink PRB idle rate corresponding to the uplink transmission efficiency;
a configuration module, configured to determine and configure the maximum transmit power of each component carrier for the UE according to each of the power allocation factors and the total transmit power of the UE;
the obtaining module is further configured to measure a signal to interference plus noise ratio (SINR) value of the UE on each component carrier, and receive a Power Headroom Report (PHR) of the UE on each component carrier, where the PHR is reported by the UE; and determining the SINR value of the single PRB of the UE on each component carrier according to each SINR measured value and the PHR value carried by the corresponding PHR, and taking the SINR value of each single PRB as the uplink transmission efficiency of the UE on each component carrier.
7. The power allocation apparatus according to claim 6, wherein the determining module is further configured to calculate a product of each of the uplink transmission efficiencies and its corresponding uplink PRB idle rates, and calculate a sum of each of the products; and respectively taking the ratio of each product to the sum as the power allocation factor of the UE on each component carrier.
8. The power allocation apparatus according to claim 6, wherein the power allocation apparatus further comprises a modification module, configured to obtain and modify each of the power allocation factors according to a service type of the UE in each component carrier;
and the configuration module is further used for determining and configuring the maximum transmission power of the UE in each component carrier according to each power allocation factor and the total transmission power of the UE when the correction is completed.
9. The power allocation apparatus according to claim 6, wherein the power allocation apparatus further includes a first adjusting module, configured to, while receiving the PHR reported by the UE, adopt the stored downlink path loss value of the UE on each component carrier, and respectively smooth a current downlink path loss value of the UE derived from the PHR corresponding to the UE; and storing each downlink loss value after the smoothing processing, and adjusting the detection period according to each downlink loss value after the smoothing processing.
10. The power allocation apparatus according to claim 6, wherein the power allocation apparatus further comprises a second adjusting module configured to adjust the detection period according to the uplink PRB idle rate of each component carrier.
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