CN113573395A - Power control method, system and terminal for sounding reference signal - Google Patents
Power control method, system and terminal for sounding reference signal Download PDFInfo
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- CN113573395A CN113573395A CN202111115837.7A CN202111115837A CN113573395A CN 113573395 A CN113573395 A CN 113573395A CN 202111115837 A CN202111115837 A CN 202111115837A CN 113573395 A CN113573395 A CN 113573395A
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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
- H04W52/06—TPC algorithms
- H04W52/08—Closed loop power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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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
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/365—Power headroom reporting
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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 control method, a system and a terminal of a sounding reference signal, wherein the method comprises the following steps: when a base station receives a sounding reference signal sent by user equipment, acquiring a measured value of the sounding reference signal, and outputting the measured value of the processed sounding reference signal and a power margin calculated in real time; acquiring a target value of the closed-loop power control maintained at present, and outputting the target value of the closed-loop power control adjusted in a self-adaptive manner; calculating a closed-loop power control adjustment value of the sounding reference signal according to the processed measurement value of the sounding reference signal, the real-time calculated power margin and the adjusted target value of the closed-loop power control; and acquiring all power control commands to be scheduled, sequentially allocating control resources for the power control commands to be scheduled according to the priority order, and sending downlink control information to the user equipment. The invention realizes effective power control of the sounding reference signal and meets the requirement of the base station side on the receiving performance of the sounding reference signal.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, a system, a terminal, and a computer-readable storage medium for controlling power of a sounding reference signal.
Background
In a 5G NR (5G New Radio, a global 5G standard designed based on a New air interface of an orthogonal frequency division multiplexing technology, which is also a very important cellular mobile technology base of the next generation, and a 5G technology will realize ultra-low time delay and high reliability), a Sounding Reference Signal SRS (Sounding Reference Signal) is mainly used for uplink or downlink channel quality feedback, and the specific functions include the following two types: the base station acquires uplink channel information by measuring the SRS so as to assist uplink scheduling, resource allocation and data transmission; the base station obtains downlink channel information (suitable for TDD, Time Division Duplexing) by measuring the SRS, so as to assist downlink scheduling, resource allocation, and data transmission. An unreasonable SRS power control mechanism can affect the performance of a wireless communication system, the requirement cannot be met if the power is too low, redundant energy consumption is caused if the power is too high, the same frequency interference is increased, and in addition, precious control channel resources can be occupied by redundant control command issuing.
In the prior art, there are two main implementation manners for SRS power control: open loop power control, namely, a base station initially configures power control parameters for a terminal, and then the terminal autonomously determines the transmitting power; closed loop Power Control, that is, the base station sends DCI (Downlink Control Information) to the terminal through a Downlink Control channel, where a TPC (Transmit Power Control) field is carried as a Power Control command.
The SRS transmission power includes two parts (i) of open-loop power and closed-loop adjustment amount h (i) (which are added), and the open-loop power control cannot meet the SRS transmission requirements in various scenes, and specifically has the following problems: firstly, tracking open loop power is a downlink PL (path loss), the path loss is calculated by a reference signal configured by a base station, and in many scenarios (for example, an air interface path loss asymmetric scenario or a base station multi-antenna scenario), the downlink PL and an uplink PL of a channel for transmitting an SRS are not symmetric; secondly, the requirement of the base station side on the SRS receiving performance, such as the Signal to Interference plus Noise Ratio (SINR), needs to consider the influence of the wireless channel environment such as Interference Noise, and obviously, the requirement cannot be realized by an open-loop power control mechanism; and thirdly, the updating time of the downlink PL depends on the reference signal configuration for measuring the path loss, so that the time for adjusting the terminal power is not flexible enough. In summary, due to the limitation of the open-loop power control mechanism, the requirement of the base station side on the SRS reception performance cannot be met.
The existing SRS closed-loop power control technology mainly uses a non-independent mode of following PUSCH (Physical uplink shared channel) power control, that is, a mode in which a base station configures power control for a terminal is a mode of following PUSCH (or may be configured as an independent mode), and SRS TPC is equal to PUSCH TPC under such configuration, which cannot meet the power requirement that SRS is different from PUSCH. While the SRS independent closed-loop power control technology is applied less in the existing commercial scenarios, the existing implementation manner is similar to the PUSCH closed-loop power control (setting the signal to interference plus noise ratio SINR as the target value of the power control). Specifically, for the new 5G NR technology SRS-carrier switching, sounding reference signal technology, the existing SRS closed-loop power control technology exists where the following needs to be improved:
(1) in an SRS-carrier switching scene, as only an SRS is transmitted on a subcarrier without a PUSCH, a common closed-loop power control mechanism that the SRS follows the PUSCH cannot be used; moreover, for the SRS independent closed-loop power control mechanism, the SRS-carrier switching new scene puts new requirements on the flow design, and the existing flow of the non-SRS-carrier switching scene cannot be used.
(2) The existing SINR target value closed-loop power control mechanism cannot be well adapted to the specific use of a specific SRS resource type, for example, for an SRS-carrier switching scenario, subcarriers are used for calculating an SRS of downlink channel quality, and unreasonable SRS transmission power affects calculation of a downlink beamforming weight.
(3) The existing SRS closed-loop power control mechanism does not consider the limitation of control resources, and particularly, the SRS closed-loop power control command TPC is issued to the terminal through the multicast DCI2_3 format, and the occupied common control resources are more precious. The redundant power control command is issued, which causes the waste of control resources and influences the overall performance of the cell; when the control resources are limited, a strategy is also needed for coordination.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The invention mainly aims to provide a method, a system, a terminal and a computer readable storage medium for controlling power of sounding reference signals, and aims to solve the problem that closed-loop power control cannot be effectively performed on SRS of each subcarrier in a carrier aggregation scene in the prior art.
In order to achieve the above object, the present invention provides a method for controlling power of a sounding reference signal, including:
when a base station receives a sounding reference signal sent by user equipment, acquiring a measured value of the sounding reference signal, and outputting the processed measured value of the sounding reference signal and a real-time calculated power margin;
acquiring a target value of the closed-loop power control maintained at present, and outputting the target value of the closed-loop power control adjusted in a self-adaptive manner;
calculating a closed-loop power control adjustment value and a power control command of the sounding reference signal according to the processed measurement value of the sounding reference signal, the real-time calculated power margin and the adjusted target value of the closed-loop power control;
and acquiring all power control commands to be scheduled, sequentially allocating control resources for the power control commands to be scheduled according to the priority order, and sending downlink control information to the user equipment.
The method for controlling the power of the sounding reference signal, wherein after the sounding reference signal measurement value is obtained, the processing of the sounding reference signal measurement value comprises:
acquiring the receiving power and the interference noise value of each resource unit;
respectively carrying out linear value averaging on the received power and the interference noise values of all resource units to obtain the average value of the received power and the average value of the interference noise value of each resource unit;
and calculating the difference value of the average value of the received power and the average value of the interference noise value to obtain the signal-to-interference-and-noise ratio.
The method for controlling power of sounding reference signal, wherein the base station receives the sounding reference signal sent by the user equipment, and then the method further comprises:
and calculating the real-time measurement power margin of the measurement value of the sounding reference signal corresponding to the sending moment according to a preset algorithm.
The power control method of the sounding reference signal, wherein the preset algorithm is as follows:
wherein the content of the first and second substances,
a real-time measured power headroom indicating a time when the measured value of the sounding reference signal corresponds to transmission,
indicating the power headroom reported by the ue,
indicating correspondence of this sounding reference signal measurementRBThe size of the capsule is determined by the size of the capsule,
refers to the closed loop adjustment amount of the sounding reference signal when the power headroom is reported,
the closed-loop adjustment amount of the sounding reference signal corresponding to the sounding reference signal measurement is referred to.
The method for controlling power of a sounding reference signal, where the obtaining of a target value of a currently maintained closed-loop power control and outputting of a target value of a closed-loop power control after adaptive adjustment, specifically includes:
according to a preset judgment condition, if the preset condition of improving the target value of the closed-loop power control is met, improving the target value; and if the preset condition for reducing the target value of the closed-loop power control is met, reducing the target value.
The method for controlling power of sounding reference signal, wherein the obtaining of the target value of the currently maintained closed-loop power control and outputting the target value of the closed-loop power control after adaptive adjustment, further include:
when the base station receives the sounding reference signal and calculates the beamforming gain each time, the first counter is increased by one;
and judging whether the beamforming gain is smaller than a downlink beamforming gain target or not, if so, adding one to the second counter, and if not, keeping the second counter unchanged.
The method for controlling the power of the sounding reference signal, wherein the downlink beamforming gain target is a configurable flexible parameter.
The method for controlling power of a sounding reference signal, wherein the calculating a closed-loop power control adjustment value and a power control command of the sounding reference signal according to a processed measurement value of the sounding reference signal, a real-time calculated power headroom, and an adjusted target value of closed-loop power control further includes:
judging whether the closed-loop power control adjustment value needs to be corrected according to preset conditions, and if so, correcting the closed-loop power control adjustment value;
and mapping the closed-loop power control adjustment value into a power control command filled in the downlink control information.
The method for controlling power of a sounding reference signal, where mapping the closed-loop power control adjustment value to a power control command filled in downlink control information, specifically includes:
mapping the positive closed-loop power control adjustment value to a positive power control command value closest to the closed-loop power control adjustment value;
and mapping the negative closed-loop power control adjustment value to a negative power control command value closest to the closed-loop power control adjustment value.
The method for controlling power of sounding reference signals, where the obtaining all power control commands to be scheduled, sequentially allocating control resources to the power control commands to be scheduled according to a priority order, and sending downlink control information to the user equipment, specifically includes:
carrying out priority sequencing on all power control commands to be scheduled;
and allocating control resources for the power control commands to be scheduled in sequence according to the priority order until the number of the scheduled user equipment reaches an upper limit value, and waiting for the next scheduling opportunity for the remaining unscheduled power control commands.
In the power control method for sounding reference signals, a base station scheduler maintains power control commands on subcarriers of all user equipment in real time.
In addition, to achieve the above object, the present invention further provides a system for controlling power of a sounding reference signal, wherein the system for controlling power of a sounding reference signal includes:
the auxiliary data maintenance module is used for acquiring a measured value of a sounding reference signal when a base station receives the sounding reference signal sent by user equipment, and outputting the processed measured value of the sounding reference signal and a power margin calculated in real time;
the target value self-adaptive module is used for acquiring a target value of the closed-loop power control maintained at present and outputting the target value of the closed-loop power control adjusted in a self-adaptive manner;
a power control command calculation module, configured to calculate a closed-loop power control adjustment value and a power control command of the sounding reference signal according to the processed measurement value of the sounding reference signal, the real-time calculated power headroom, and the adjusted target value of closed-loop power control;
and the group downlink control information module is used for acquiring all power control commands to be scheduled, sequentially allocating control resources for the power control commands to be scheduled according to the priority order, and sending downlink control information to the user equipment.
In addition, to achieve the above object, the present invention further provides a terminal, wherein the terminal includes: the present invention relates to a sounding reference signal power control method, and more particularly, to a sounding reference signal power control method, which includes the steps of the above-described sounding reference signal power control method, when executed by a processor.
In addition, to achieve the above object, the present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a power control program of a sounding reference signal, and the power control program of the sounding reference signal, when executed by a processor, implements the steps of the power control method of the sounding reference signal as described above.
In the invention, when a base station receives a sounding reference signal sent by user equipment, a measured value of the sounding reference signal is obtained, and the processed measured value of the sounding reference signal and a real-time calculated power margin are output; acquiring a target value of the closed-loop power control maintained at present, and outputting the target value of the closed-loop power control adjusted in a self-adaptive manner; calculating a closed-loop power control adjustment value and a power control command of the sounding reference signal according to the processed measurement value of the sounding reference signal, the real-time calculated power margin and the adjusted target value of the closed-loop power control; and acquiring all power control commands to be scheduled, sequentially allocating control resources for the power control commands to be scheduled according to the priority order, and sending downlink control information to the user equipment. The invention realizes effective power control of the sounding reference signal and meets the requirement of the base station side on the receiving performance of the sounding reference signal.
Drawings
FIG. 1 is a flow chart of a preferred embodiment of a method for power control of SRS in accordance with the present invention;
FIG. 2 is a flow chart illustrating a target value of closed-loop power control for outputting adaptive adjustment according to a preferred embodiment of the method for power control of SRS of the present invention;
FIG. 3 is a schematic diagram of a preferred embodiment of a power control system for SRS of the present invention;
FIG. 4 is a schematic diagram illustrating the implementation of power control of each module in the preferred embodiment of the SRS power control system according to the present invention;
FIG. 5 is a schematic diagram illustrating SRS power control over carriers of a base station in a preferred embodiment of a sounding reference signal power control system according to the invention;
FIG. 6 is a schematic diagram of a power control system for SRS according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. 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 relates to 5G NR (New Radio) wireless communication, and is capable of performing effective power control on Sounding Reference Signal (SRS) (sounding Reference signal). Specifically, a power control method for sounding reference signals is provided for a SRS-carrier switching scenario in carrier aggregation ca (carrier aggregation), that is, a scenario in which multiple carriers are configured in a downlink, and pusch (physical uplink shared channel) and pucch (physical uplink control channel) are not configured on an uplink subcarrier, and only sounding reference signals are transmitted.
As shown in fig. 1, the method for controlling power of a sounding reference signal according to a preferred embodiment of the present invention includes the following steps:
step S10, when the base station receives the sounding reference signal sent by the user equipment, obtaining a measurement value of the sounding reference signal, and outputting the processed measurement value of the sounding reference signal and the power headroom calculated in real time.
Specifically, when a base station receives an SRS (sounding reference signal) sent by a ue (user equipment), a physical layer measurement module obtains a measurement value of the SRS, a received power Pw of each RE (Resource element) and a received NI (interference + noise) of each RE, where the measurement value needs to be processed as follows: firstly, respectively carrying out linear value averaging on the received power Pw and the received NI of all RE levels to obtain an average value Pw _ Avg and an average value NI _ Avg (converted into a dB value from a linear value) of each RE; signal to interference and noise ratio SINR (in dB) is calculated, SRS _ SINRpc = Pw _ Avg-NI _ Avg.
Further, when the base station receives the SRS measurement of the UEx, it needs to calculate the corresponding transmission time of the SRS measurement according to a preset algorithm
Wherein the preset algorithm is as follows:
wherein the content of the first and second substances,
a real-time measured power headroom indicating a time when the measured value of the sounding reference signal corresponds to transmission,
indicating the power headroom reported by the ue,
indicating correspondence of this sounding reference signal measurementRBThe size of the capsule is determined by the size of the capsule,
refers to the closed loop adjustment amount of the sounding reference signal when the power headroom is reported,
the closed-loop adjustment amount of the sounding reference signal corresponding to the sounding reference signal measurement is referred to.
If 
PowerLimitCount=PowerLimitCount+1；
Elseif
I PowerLimitCount has failed
PowerLimitCount=0；
End
The definition counter powerlimit count is initialized to 0, the timeliness of the definition counter powerlimit count is defined, and if the definition counter is not updated after a certain time (such as 1 s), the counter is considered to be invalid.
And step S20, acquiring the target value of the closed-loop power control maintained at present, and outputting the target value of the closed-loop power control adjusted in a self-adaptive manner.
Specifically, according to a preset judgment condition, if a preset condition for improving the target value of the closed-loop power control is met, the target value is improved; and if the preset condition for reducing the target value of the closed-loop power control is met, reducing the target value.
As shown in fig. 2, each time the base station receives the SRS measurement and calculates BFGain, the procedure of updating the counters BFCount and negtivecount is as follows:
BFCount=BFCount+1；
and judging whether the BFgain is less than the BFGainTarget, counting Negativecount = Negativecount +1, otherwise, keeping the Negativecount unchanged.
Defining a downlink beamforming gain target as BFGainTarget, wherein the BFGainTarget is used as a configurable flexible parameter; a counter BFCount, NegativeCount, is defined, initialized to 0.
The target value adaptive process is as follows:
If NegativeCount/BFCount>NegativeRatio+NegativeRatioMargin && BFCount>BFCountThr
Tatget = Target+TargetStep；
Elseif NegativeCount/BFCount<NegativeRatio-NegativeRatioMargin && BFCount>BFCountThr
Tatget = Target-TargetStep；
Else
tatget remains unchanged;
END
the Target value (Target SRS _ SINR) is initialized to Target = Target _ origin, the Target _ origin refers to an initial power control Target value and is set as a configurable parameter, and a default value is configured according to a specific requirement for SRS _ SINR in a specific application scenario; BFCountThr is a configurable parameter, with the aim of ensuring a sufficient number of samples; NegativeRatioMarkin is the adaptive target lag, which is a configurable parameter that sets the adaptive target upper and lower lags to smooth the Tatget adjustment, reducing unnecessary frequent adjustments due to normal fluctuations.
And step S30, calculating a closed-loop power control adjustment value and a power control command of the sounding reference signal according to the processed measurement value of the sounding reference signal, the real-time calculated power headroom and the adjusted target value of the closed-loop power control.
Specifically, an SRS closed-loop Power Control command TPC of the UEx is designed to be periodically triggered, and when a periodic point arrives, the base station calculates TPCvalue (Transmit Power Control value, Power Control adjustment value, unit is dB) according to the following calculation method.
The TPC calculation procedure is as follows:
If SRS_SINRpc>Target+TargetMargin
TPCvalue= Target+TargetMargin-SRS_SINRpc；
ElseIf SRS_SINRpc<Target-TargetMargin
TPCvalue= Target-TargetMargin-SRS_SINRpc；
Else
TPCvalue= 0；
END
the Target is the Target SINR of SRS closed-loop power control output by the Target self-adaptive module, the targetMargin is the hysteresis of the Target SINR, the upper and lower hysteresis of the Target SINR is set to smooth the adjustment of the closed-loop power control, the power control adjustment which is too frequent and has no positive effect and caused by measurement fluctuation or other reasons is reduced, and control resources are saved as much as possible.
The TPC correction procedure is as follows,
If PowerLimitCount> PowerLimitCountThr && TPCvalue>0
TPCvalue= 0；
Else
TPCvalue is not modified.
End
The powerlimit count is an SRS power margin evaluation result maintained by the auxiliary data maintenance module, a cumulative power limited time threshold powerlimit count Thr is set as a configurable flexible parameter, the parameter can be configured according to the control resource limited degree, for example, if the TPC to be scheduled fed back in real time exceeds a certain time, the powerlimit count Thr is automatically reduced, otherwise, if the number of the TPC to be scheduled does not exceed the threshold, the powerlimit count Thr can be automatically increased. The TPC correction flow is intended to avoid redundant power control adjustment and save control resources.
Mapping all TPCvalues to power control commands filled in the DCI2_3, wherein the specific mapping method is as follows: positive TPCvalue is mapped to a positive power control command value closest to the value, and negative TPCvalue is mapped to a negative power control command value closest to the value.
Step S40, obtaining all power control commands to be scheduled, allocating control resources to the power control commands to be scheduled in sequence according to the priority order, and sending downlink control information to the user equipment.
Specifically, the carrier c0 is defined as a primary carrier of UEx (x =0, 1 …). The group downlink control information module maintained by the carrier (cell) c0 on the base station side serves as a control center to coordinate overall issuing opportunities of power control commands of UEx (x =0, 1 …).
The group downlink control information module of the carrier c0 traverses the power control command transmission requirement of the subcarrier ci (i =1, 2 …) of the UEx (x =0, 1 …), allocates control resources for each power control command to be scheduled according to the priority order, and issues a group DCI2_3, where the specific flow is as follows:
the power control commands of all subcarriers ci (i =1, 2 …) of UEx (x =0, 1 …) to be scheduled are prioritized, and the priority factor of the power control commands of subcarriers ci of UEx is calculated as follows (according to the following formula
Higher priority higher):
And allocating control resources for the power control commands to be scheduled in sequence according to the priority order until the number of the scheduled UE of the DCI2_3 reaches an upper limit value, and waiting for the next scheduling opportunity by the remaining unscheduled power control commands.
Further, as shown in fig. 3, based on the above method for controlling power of a sounding reference signal, the present invention also provides a system for controlling power of a sounding reference signal, wherein the system for controlling power of a sounding reference signal includes:
an auxiliary data maintenance module 51, configured to, when a base station receives a sounding reference signal sent by a user equipment, obtain a measured value of the sounding reference signal, and output the processed measured value of the sounding reference signal and a power headroom calculated in real time;
a target value adaptive module 52, configured to obtain a target value of the currently maintained closed-loop power control, and output a target value of the closed-loop power control after adaptive adjustment;
a power control command calculation module 53, configured to calculate a closed-loop power control adjustment value and a power control command of the sounding reference signal according to the processed measurement value of the sounding reference signal, the power headroom calculated in real time, and the adjusted target value of the closed-loop power control;
a group downlink control information module 54, configured to acquire all power control commands to be scheduled, allocate control resources to the power control commands to be scheduled in sequence according to the priority order, and send downlink control information to the user equipment.
Specifically, as shown in fig. 4 and fig. 5, the power control command calculation module 53 is a TCP calculation module, and the group downlink control information module 54 is a group DCI module; when the current base station receives the SRS transmitted by the subcarrier c1 of the UE3 (the UE3 refers to one of the UEs 0 to UEx), the flows of the auxiliary data maintenance module 51 and the target value adaptation module 52 are triggered, and all the flows are maintained on the main carrier (cell) c0 of the UE 3.
Wherein, the auxiliary data maintenance module 51 is configured to calculate SRS _ SINRpc of the UE3 subcarrier c 1; inputting: received power per RE of SRS and received interference noise. Respectively carrying out linear value averaging on the SRS receiving power and the receiving interference noise measured values of all RE levels, and then converting into a dB value to obtain an average value Pw _ Avg and an average value NI _ Avg (unit dB) of each RE; SRS _ SINRpc = Pw _ Avg-NI _ Avg is calculated (assuming that the calculation result is 20 dB).
The assistance data maintenance module 51 is further configured to calculate SRS real-time power headroom for UE3 subcarrier c 1; inputting: SRSPHR report for subcarrier c1 reported by UE3 (assumed to be 3 dB); powerlimit count history save value (assumed to be 1); SRS bandwidth RB real-time measurement of current SRS measurement (assumed to be 34 RB); subcarrier spacing (assumed to be 15 kHz); and reporting the closed loop power adjustment amount hi and measuring hi (assuming that the closed loop power adjustment amount hi is 0) at the SRSPHR reporting time and the time corresponding to the current SRS measurement. When the base station receives the SRS measurement of the subcarrier c1 of the UE3, the corresponding transmission time of the SRS measurement needs to be calculated
：
Due to the satisfaction of the conditions
；
Update counter powerlimit count = powerlimit count +1= 2.
The target value adaptation module 52 is configured to output a target value of the adaptively adjusted closed-loop power control. Inputting: base station network management configuration, including BFGainTarget of 5dB, Negatievaratio of 10%, NegatievaratioMargin of 2%, TargetStep of 0.5dB, BFCountThr of 100; the current Target maintained by the base station is 25 dB. The base station calculates BFgain (assuming the calculation result is 3 dB) according to the received SRS; update counter BFCount = BFCount +1 (assuming the calculation result is 121); since the condition BFGain =3dB < BFGainTarget (5 dB) is satisfied, the update counter NegativeCount = NegativeCount +1 (assuming that the calculation result is 15); entering a target value self-adaptive flow:
because the conditions are satisfied:
NegativeCount/BFCount =15/121=12.4 > (NegativeRatio + NegativeRatioMargin) 12% and BFCount =121> BFCountThr (100),
update Target = Target + TargetStep =25+0.5=25.5 dB.
When the SRS closed-loop power control cycle time point arrives, the TPC calculation procedure of the UE3 subcarrier c1 of the power control command calculation module 53 is triggered, and all the procedures are maintained on the main carrier (cell) c0 of the UE 3.
The power control command calculation module 53 is configured to calculate an SRS closed-loop power control adjustment value and a power control command. Inputting: the base station network management configuration-TargetMargin is 2dB, and the Power LimitCountThr is 3; output of the auxiliary data maintenance module 51: SRS _ SINRpc is 20dB, and PowerLimitCount is 2; the output-Target of the Target adaptation block 52 is 23.5 dB. Since the condition SRS _ SINRpc =20dB < (Target-TargetMargin) 23.5dB is satisfied, it is calculated:
TPCvalue= Target-TargetMargin-SRS_SINRpc=23.5-20=3.5dB；
entering a TPC correction flow, and not correcting TPCvalue because the condition PowerLimitCount > PowerLimitCountThr & & TPCvalue >0 is not met.
Mapping all TPCvalues to power control commands filled in the DCI2_3, wherein the specific mapping method is as follows: positive TPCvalue is mapped to a positive power control command value closest to the value, and negative TPCvalue is mapped to a negative power control command value closest to the value.
For carrier level flows, i.e. the group downlink control information module 54: after the power control command of the current UE3 subcarrier c1 is generated by the power control command calculation module 53, it enters the group downlink control information module 54. Assume that in the power control command queue to be scheduled of the current downlink control information module to be grouped 54, except that the power control command of the UE3 subcarrier c1 is newly added to the queue, there are power control commands of the UE0 subcarrier c1 and c2 and the UE2 subcarrier c1, c2 and c3 that have failed in the last scheduling.
As shown in fig. 5, the group downlink control information module 54 is configured to execute a power control command TPC to be scheduled, execute a base station side flow, fill in downlink control information, and finally issue the power control command TPC to a user terminal. Inputting: base station network management configuration
And
(ii) a Output of the auxiliary data maintenance module 51:
，
，
，
， 
， 
(ii) a Output of the target value adaptation module 52:
，
，
，
，
，
(ii) a Output of the power control command calculation block 53: power control command for UE3 subcarrier c 1; downlink scheduling priority of UE0 subcarriers c1 and c2, UE2 subcarriers c1 and c2 and c3 and UE3 subcarrier c1 maintained by base station scheduler in real time
，
，
，
，
，
。
The group downlink control information module of the base station side carrier c0 traverses the TPC transmission requirements of all the UEs currently using c0 as the main carrier, and allocates and issues the control resource group DCI2_3 according to the priority order, and the specific flow is as follows:
the priority ranking is performed on all power control commands to be scheduled, and the priority factor calculation method of the power control commands of the UEx subcarriers ci is as follows (
Higher priority higher):
and sequentially allocating control resources for the power control commands to be scheduled according to the priority order until the number of the scheduled UE of the DCI2_3 reaches an upper limit value, and waiting for the next scheduling opportunity by the remaining unscheduled power control commands: assuming that the upper limit value of each scheduling is 5, according to the priority, the power control commands of this scheduling are the power control commands of UE3 subcarrier 1, UE0 subcarriers c1 and c2, and UE2 subcarriers c1 and c 2. While the power control command for UE2 subcarrier c3 is not scheduled this time.
Aiming at a UE level flow of a terminal UEx, a main carrier of the UEx is used as a control center of the UE level flow, and a sounding reference signal closed-loop power control flow of each sub-carrier of the UEx is comprehensively maintained; namely, the closed-loop power control calculation flow of the subcarrier of the UEx and the maintenance of related data are centralized to the main carrier of the UEx; meanwhile, aiming at the carrier level (cell level) flow of one carrier, overall coordination is carried out on all issuing opportunities of the power control command of the UE taking the carrier as the main carrier.
For UE level flows: specifically aiming at the SRS resource type and the application in an SRS-carrierswitching scene, a self-adaptive SRS closed-loop power control target based on a beamforming gain BFgain (beamforming gain) is designed; and (4) considering the saving of control resources, designing a TPC calculation scheme and avoiding the issuing of redundant TPC control signaling as much as possible. Aiming at the carrier level flow: considering the problem of control resource limitation, a rule of group DCI is designed that considers both the power requirement and scheduling priority of each UE.
Further, as shown in fig. 6, based on the above method and system for controlling power of the sounding reference signal, the present invention also provides a terminal, which includes a processor 10, a memory 20 and a display 30. Fig. 6 shows only some of the components of the terminal, but it is to be understood that not all of the shown components are required to be implemented, and that more or fewer components may be implemented instead.
The memory 20 may in some embodiments be an internal storage unit of the terminal, such as a hard disk or a memory of the terminal. The memory 20 may also be an external storage device of the terminal in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the terminal. Further, the memory 20 may also include both an internal storage unit and an external storage device of the terminal. The memory 20 is used for storing application software installed in the terminal and various types of data, such as program codes of the installation terminal. The memory 20 may also be used to temporarily store data that has been output or is to be output. In an embodiment, the memory 20 stores a power control program 40 for a sounding reference signal, and the power control program 40 for a sounding reference signal can be executed by the processor 10, so as to implement the power control method for a sounding reference signal in the present application.
The processor 10 may be a Central Processing Unit (CPU), a microprocessor or other data Processing chip in some embodiments, and is used for executing program codes stored in the memory 20 or Processing data, such as executing the power control method of the sounding reference signal.
The display 30 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch panel, or the like in some embodiments. The display 30 is used for displaying information at the terminal and for displaying a visual user interface. The components 10-30 of the terminal communicate with each other via a system bus.
In one embodiment, when the processor 10 executes the power control program 40 for the sounding reference signal in the memory 20, the following steps are implemented:
when a base station receives a sounding reference signal sent by user equipment, acquiring a measured value of the sounding reference signal, and outputting the processed measured value of the sounding reference signal and a real-time calculated power margin;
acquiring a target value of the closed-loop power control maintained at present, and outputting the target value of the closed-loop power control adjusted in a self-adaptive manner;
calculating a closed-loop power control adjustment value and a power control command of the sounding reference signal according to the processed measurement value of the sounding reference signal, the real-time calculated power margin and the adjusted target value of the closed-loop power control;
and acquiring all power control commands to be scheduled, sequentially allocating control resources for the power control commands to be scheduled according to the priority order, and sending downlink control information to the user equipment.
Wherein, after obtaining the measurement value of the sounding reference signal, the processing of the measurement value of the sounding reference signal includes:
acquiring the receiving power and the interference noise value of each resource unit;
respectively carrying out linear value averaging on the received power and the interference noise values of all resource units to obtain the average value of the received power and the average value of the interference noise value of each resource unit;
and calculating the difference value of the average value of the received power and the average value of the interference noise value to obtain the signal-to-interference-and-noise ratio.
Wherein, the base station receives the sounding reference signal sent by the user equipment, and then further comprises:
and calculating the real-time measurement power margin of the measurement value of the sounding reference signal corresponding to the sending moment according to a preset algorithm.
Wherein the preset algorithm is as follows:
wherein the content of the first and second substances,
a real-time measured power headroom indicating a time when the measured value of the sounding reference signal corresponds to transmission,
indicating the power headroom reported by the ue,
indicating correspondence of this sounding reference signal measurementRBThe size of the capsule is determined by the size of the capsule,
refers to the closed loop adjustment amount of the sounding reference signal when the power headroom is reported,
the closed-loop adjustment amount of the sounding reference signal corresponding to the sounding reference signal measurement is referred to.
The obtaining of the target value of the currently maintained closed-loop power control and outputting the target value of the closed-loop power control after the adaptive adjustment specifically include:
according to a preset judgment condition, if the preset condition of improving the target value of the closed-loop power control is met, improving the target value; and if the preset condition for reducing the target value of the closed-loop power control is met, reducing the target value.
The obtaining of the target value of the currently maintained closed-loop power control and outputting the target value of the closed-loop power control after the adaptive adjustment further include:
when the base station receives the sounding reference signal and calculates the beamforming gain each time, the first counter is increased by one;
and judging whether the beamforming gain is smaller than a downlink beamforming gain target or not, if so, adding one to the second counter, and if not, keeping the second counter unchanged.
Wherein the downlink beamforming gain target is a configurable flexible parameter.
Wherein, the calculating a closed-loop power control adjustment value and a power control command of the sounding reference signal according to the processed measurement value of the sounding reference signal, the real-time calculated power margin and the adjusted target value of the closed-loop power control further includes:
judging whether the closed-loop power control adjustment value needs to be corrected according to preset conditions, and if so, correcting the closed-loop power control adjustment value;
and mapping the closed-loop power control adjustment value into a power control command filled in the downlink control information.
The mapping of the closed-loop power control adjustment value to the power control command filled in the downlink control information specifically includes:
mapping the positive closed-loop power control adjustment value to a positive power control command value closest to the closed-loop power control adjustment value;
and mapping the negative closed-loop power control adjustment value to a negative power control command value closest to the closed-loop power control adjustment value.
The obtaining all the power control commands to be scheduled, sequentially allocating control resources to the power control commands to be scheduled according to the priority order, and sending downlink control information to the user equipment specifically includes:
carrying out priority sequencing on all power control commands to be scheduled;
and allocating control resources for the power control commands to be scheduled in sequence according to the priority order until the number of the scheduled user equipment reaches an upper limit value, and waiting for the next scheduling opportunity for the remaining unscheduled power control commands.
The base station scheduler maintains power control commands on subcarriers of all user equipment in real time.
The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a power control program of a sounding reference signal, and the power control program of the sounding reference signal, when executed by a processor, implements the steps of the power control method of the sounding reference signal as described above.
In summary, the present invention provides a method, a system and a terminal for controlling power of a sounding reference signal, where the method includes: when a base station receives a sounding reference signal sent by user equipment, acquiring a measured value of the sounding reference signal, and outputting the processed measured value of the sounding reference signal and a real-time calculated power margin; acquiring a target value of the closed-loop power control maintained at present, and outputting the target value of the closed-loop power control adjusted in a self-adaptive manner; calculating a closed-loop power control adjustment value and a power control command of the sounding reference signal according to the processed measurement value of the sounding reference signal, the real-time calculated power margin and the adjusted target value of the closed-loop power control; and acquiring all power control commands to be scheduled, sequentially allocating control resources for the power control commands to be scheduled according to the priority order, and sending downlink control information to the user equipment. The invention realizes effective power control of the sounding reference signal and meets the requirement of the base station side on the receiving performance of the sounding reference signal.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (14)
1. A method for power control of a Sounding Reference Signal (SRS), the method comprising:
when a base station receives a sounding reference signal sent by user equipment, acquiring a measured value of the sounding reference signal, and outputting the processed measured value of the sounding reference signal and a real-time calculated power margin;
acquiring a target value of the closed-loop power control maintained at present, and outputting the target value of the closed-loop power control adjusted in a self-adaptive manner;
calculating a closed-loop power control adjustment value and a power control command of the sounding reference signal according to the processed measurement value of the sounding reference signal, the real-time calculated power margin and the adjusted target value of the closed-loop power control;
and acquiring all power control commands to be scheduled, sequentially allocating control resources for the power control commands to be scheduled according to the priority order, and sending downlink control information to the user equipment.
2. The method according to claim 1, wherein after obtaining the sounding reference signal measurement value, the processing of the sounding reference signal measurement value comprises:
acquiring the receiving power and the interference noise value of each resource unit;
respectively carrying out linear value averaging on the received power and the interference noise values of all resource units to obtain the average value of the received power and the average value of the interference noise value of each resource unit;
and calculating the difference value of the average value of the received power and the average value of the interference noise value to obtain the signal-to-interference-and-noise ratio.
3. The method of claim 1, wherein the base station receives the sounding reference signal sent by the user equipment, and then further comprising:
and calculating the real-time measurement power margin of the measurement value of the sounding reference signal corresponding to the sending moment according to a preset algorithm.
4. The method according to claim 3, wherein the predetermined algorithm is:
wherein the content of the first and second substances,
a real-time measured power headroom indicating a time when the measured value of the sounding reference signal corresponds to transmission,
indicating power headroom reported by user equipment
Indicating correspondence of this sounding reference signal measurementRBThe size of the capsule is determined by the size of the capsule,
refers to the closed loop adjustment amount of the sounding reference signal when reporting the power headroom
The closed-loop adjustment amount of the sounding reference signal corresponding to the sounding reference signal measurement is referred to.
5. The method according to claim 1, wherein the obtaining a target value of a currently maintained closed-loop power control and outputting a target value of a closed-loop power control after adaptive adjustment specifically includes:
according to a preset judgment condition, if the preset condition of improving the target value of the closed-loop power control is met, improving the target value; and if the preset condition for reducing the target value of the closed-loop power control is met, reducing the target value.
6. The method according to claim 1, wherein the obtaining a target value of a currently maintained closed-loop power control and outputting a target value of a closed-loop power control after adaptive adjustment further comprise:
when the base station receives the sounding reference signal and calculates the beamforming gain each time, the first counter is increased by one;
and judging whether the beamforming gain is smaller than a downlink beamforming gain target or not, if so, adding one to the second counter, and if not, keeping the second counter unchanged.
7. The method of claim 6, wherein the downlink beamforming gain target is a configurable flexible parameter.
8. The method according to claim 1, wherein the calculating the closed-loop power control adjustment value and the power control command of the sounding reference signal according to the processed measured value of the sounding reference signal, the real-time calculated power headroom, and the adjusted target value of the closed-loop power control further comprises:
judging whether the closed-loop power control adjustment value needs to be corrected according to preset conditions, and if so, correcting the closed-loop power control adjustment value;
and mapping the closed-loop power control adjustment value into a power control command filled in the downlink control information.
9. The method according to claim 8, wherein the mapping the closed-loop power control adjustment value to a power control command filled in downlink control information includes:
mapping the positive closed-loop power control adjustment value to a positive power control command value closest to the closed-loop power control adjustment value;
and mapping the negative closed-loop power control adjustment value to a negative power control command value closest to the closed-loop power control adjustment value.
10. The method according to claim 1, wherein the obtaining all power control commands to be scheduled, sequentially allocating control resources to the power control commands to be scheduled according to a priority order, and sending downlink control information to the ue, specifically comprises:
carrying out priority sequencing on all power control commands to be scheduled;
and allocating control resources for the power control commands to be scheduled in sequence according to the priority order until the number of the scheduled user equipment reaches an upper limit value, and waiting for the next scheduling opportunity for the remaining unscheduled power control commands.
11. The method of claim 10, wherein the base station scheduler maintains the power control commands on the subcarriers of all the ues in real time.
12. A system for power control of a sounding reference signal, the system comprising:
the auxiliary data maintenance module is used for acquiring a measured value of a sounding reference signal when a base station receives the sounding reference signal sent by user equipment, and outputting the processed measured value of the sounding reference signal and a power margin calculated in real time;
the target value self-adaptive module is used for acquiring a target value of the closed-loop power control maintained at present and outputting the target value of the closed-loop power control adjusted in a self-adaptive manner;
a power control command calculation module, configured to calculate a closed-loop power control adjustment value and a power control command of the sounding reference signal according to the processed measurement value of the sounding reference signal, the real-time calculated power headroom, and the adjusted target value of closed-loop power control;
and the group downlink control information module is used for acquiring all power control commands to be scheduled, sequentially allocating control resources for the power control commands to be scheduled according to the priority order, and sending downlink control information to the user equipment.
13. A terminal, characterized in that the terminal comprises: memory, a processor and a sounding reference signal power control program stored on the memory and executable on the processor, the sounding reference signal power control program, when executed by the processor, implementing the steps of the sounding reference signal power control method according to any of claims 1-11.
14. A computer-readable storage medium, wherein the computer-readable storage medium stores a power control program of a sounding reference signal, and the power control program of the sounding reference signal, when executed by a processor, implements the steps of the power control method of the sounding reference signal according to any one of claims 1-11.
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