CN102413557B - Uplink reference signal transmission method, terminal and multi-antenna communication system - Google Patents
Uplink reference signal transmission method, terminal and multi-antenna communication system Download PDFInfo
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- CN102413557B CN102413557B CN201110378916.7A CN201110378916A CN102413557B CN 102413557 B CN102413557 B CN 102413557B CN 201110378916 A CN201110378916 A CN 201110378916A CN 102413557 B CN102413557 B CN 102413557B
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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
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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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
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
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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
- H04W52/32—TPC of broadcast or control channels
- H04W52/325—Power control of control or pilot channels
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Abstract
The invention discloses an uplink reference signal transmission method, a terminal and a multi-antenna communication system, which are used for an LTE (Long Term Evolution) system. The uplink reference transmission method comprises the following steps of: determining uplink reference signal power of a current frame according to the SNR (Signal to Noise Ratio) of a link of a previous frame; and adjusting the transmission power of uplink reference signals of the current frame on the basis of the uplink reference signal power of the current frame and transmitting the uplink reference signals, through the terminal. According to the method, the terminal and the system disclosed by the invention, the power of the uplink reference signals is adjusted by the terminal according to the real-time state information of a channel, so that transmission of the uplink reference signals is controlled, problem of whole system performance loss caused by larger channel estimation error in an uplink of the LTE multi-antenna system can be effectively solved, channel estimation precision is effectively increased, and data demodulating capability and uplink scheduling capability of the system are promoted, therefore coverage range of the system is promoted, and the purpose of enhancing effect of the system by LTE coverage is achieved.
Description
Technical field
The present invention relates to wireless communication technology field, particularly a kind of uplink reference signal transmission, terminal and multiple antenna communication.
Background technology
Along with the develop rapidly of wireless communication technology, the main business demand of current mobile user is become based on the multimedia service of image, video and internet browsing etc., its data traffic demand and day increase severely, therefore, be how the main target of Generation Mobile Communication System evolution when user provides that speed is faster, more, picture is more excellent and tonequality is better connected to become B3G/4G.LTE (Long Term Evolution, Long Term Evolution) as a kind of high speed data network, with advantages such as its two-forty, low delay and the flat network architectures, the ever-increasing rate transmission requirements of user can be met, for user provides the mobile broadband Consumer's Experience that can reach close to current home xDSL and fiber to the home.Become while operator deployment next generation network primarily selects in LTE network, radio spectrum resources becomes more and more rare along with a large amount of continuing to bring out of wireless system, the network design of LTE appears at the high band of more than 2GHz possibly, and frequency is higher, and radio wave is larger in the propagation loss of free space, diffracting power is poorer, penetration loss is also larger, therefore, and the deployment of LTE network, owing to being the deployment based on high band, coverage has very large challenge.Especially in the uplink, because user side transmit power limited, so the problem covered is more outstanding.
In the up link of existing LTE system, utilize reference signal (Reference Signal, RS) data demodulates and channel detection is carried out, its effect comprises the channel estimating that user carries out needed for coherent demodulation, channel quality for uplink scheduling detects, power control, timing estimation etc., for realizing these two aspects function, up link supports two kinds of RS:
(1) demodulated reference signal (Demodulation Reference Signal, DM-RS), at PUSCH (Physical Uplink Shared Channel, Uplink Shared Channel)/PUCCH (Physical Uplink Control Channel, ascending control channel) be above associated with the transmission of uplink data, for the coherent demodulation in channel estimating.
(2) detection reference signal (Sounding Reference Signal, SRS), is not associated with upstream data and controls transfer, is mainly used in determining channel quality, makes can carry out frequency selective scheduling in the uplink.
The two kinds of RS power defined in existing LTE up link are fixed and consistent with data power.
Technically analyze from physical layer transmission, it is solve one of the most effective means of up covering problem that base station end multiple antennas is disposed.Based on the hypothesis of perfect channel estimation, in up link, adopt multiple antennas (as 8 antennas) to receive, receive the performance gain of the 6dB that has an appointment compared to traditional 2 antennas:
G＝10lg(8)-10lg(2)≈6dB (1)
But, in actual LTE system, the performance gain that multiple antennas receives is difficult to reach theory expectation result, this is because system to adopt based on the channel estimation method of RS in order to data demodulates and channel detection, need to estimate accurately propagation channel, as received signal to noise ratio (the Signal noise ratio of RS, SNR) time lower, channel estimation errors is comparatively large, and make the data demodulates hydraulic performance decline on Uplink Shared Channel, the performance gain finally causing multiple antennas to receive is lost.
Summary of the invention
In view of above problem proposes the present invention.
An object of the present invention is to provide a kind of technical scheme for uplink reference signals transmission.
According to a first aspect of the invention, provide a kind of uplink reference signal transmission, comprising: according to the uplink reference signals power of the signal to noise ratio snr determination present frame of previous frame link; Terminal is based on the through-put power of the uplink reference signals power adjustment present frame uplink reference signals of present frame and transmitting uplink reference signal.
Preferably, determine that the uplink reference signals power of present frame comprises according to the SNR of previous frame link: the correspondence table of inquiry SNR and reference signal power obtains the uplink reference signals power corresponding with the SNR of previous frame link.
Preferably, the SNR of previous frame link is the SNR of previous frame up link, and the method also comprises: base station calculates the SNR of previous frame up link by the channel condition information of the up link of previous frame.
Preferably, determine that the uplink reference signals power of present frame comprises according to the SNR of previous frame link: the uplink reference signals power of present frame is determined according to the SNR of previous frame up link in base station, the uplink reference signals power of present frame is sent to terminal; Or the SNR of previous frame up link is sent to terminal by base station, terminal determines the uplink reference signals power of present frame according to the SNR of previous frame up link.
Preferably, base station sends the uplink reference signals power of present frame or the SNR of previous frame up link by Downlink Control Information or upper strata instruction to terminal.
Preferably, the method also comprises: terminal estimates the SNR of present frame up link by the channel condition information of the down link of previous frame; Terminal determines the uplink reference signals power of present frame according to the SNR of present frame up link.
Preferably, the method also comprises: determine that up link is for transmitting the position of the Resource Block of the uplink reference signals of required power adjustment.
According to a further aspect in the invention, provide a kind of terminal, comprising: power acquisition module, for obtaining the uplink reference signals power of present frame, the uplink reference signals power of present frame is determined according to the SNR of previous frame link; Power regulation module, for the through-put power of the uplink reference signals power adjustment present frame uplink reference signals based on present frame; Signal transmission module, for transmitting uplink reference signal.
Preferably, power acquisition module receives the uplink reference signals power of present frame from base station, the uplink reference signals power of present frame is determined by the SNR of base station according to previous frame up link.
Preferably, power acquisition module comprises: signal to noise ratio receiving element, for receiving the SNR of previous frame up link from base station, sends the SNR of previous frame up link; Power determining unit, for receiving the SNR of the previous frame up link from signal to noise ratio receiving element, determines the uplink reference signals power of present frame according to the SNR of previous frame up link.
Preferably, the SNR of previous frame up link calculates acquisition by base station by the channel condition information of the up link of previous frame.
Preferably, the SNR of the uplink reference signals power/previous frame up link of the Downlink Control Information that sent by base station of power acquisition module or upper strata command reception present frame.
Preferably, this terminal also comprises snr computation module, and the channel condition information for the down link by previous frame estimates the SNR of present frame up link, sends the SNR of present frame up link; Power acquisition module receives the SNR from the present frame up link of snr computation module, determines the uplink reference signals power of present frame according to the SNR of present frame up link.
Preferably, this terminal also comprises corresponding table memory module: for storing the correspondence table of SNR and reference signal power; Power acquisition module receives the SNR of previous frame up link, determines the uplink reference signals power corresponding with the SNR of previous frame up link by the correspondence table of inquiry SNR and reference signal power.
Preferably, this terminal also comprises: resource block location acquisition module, for obtaining in up link for transmitting the position of the Resource Block of the uplink reference signals of required power adjustment.
Another aspect of the present invention, provides a kind of multi-aerial radio communication system, comprises above-mentioned terminal and base station.
An advantage of the present invention is, according to the uplink reference signals power of the signal to noise ratio snr determination present frame of previous frame, according to channel circumstance adjustment uplink reference signals power, can improve precision of channel estimation.
By referring to the detailed description of accompanying drawing to exemplary embodiment of the present invention, further feature of the present invention and advantage thereof will become clear.
Accompanying drawing explanation
What form a part for specification drawings describes embodiments of the invention, and together with the description for explaining principle of the present invention.
With reference to accompanying drawing, according to detailed description below, clearly the present invention can be understood, wherein:
Fig. 1 illustrates channel estimation errors schematic diagram;
Fig. 2 illustrates the system schematic of an embodiment of multi-aerial radio communication system;
Fig. 3 illustrates the flow chart of an embodiment of uplink reference signal transmission of the present invention;
Fig. 4 illustrates the flow chart of another embodiment of uplink reference signal transmission of the present invention;
Fig. 5 illustrates the flow chart of another embodiment of uplink reference signal transmission of the present invention;
Fig. 6 illustrates the flow chart of another embodiment of uplink reference signal transmission of the present invention;
Fig. 7 illustrates the structured flowchart of an embodiment of terminal of the present invention;
Fig. 8 illustrates the structured flowchart of an embodiment of wireless communication system of the present invention;
Fig. 9 illustrates the structured flowchart of another embodiment of terminal of the present invention;
Figure 10 illustrates the structured flowchart of another embodiment of terminal of the present invention.
Embodiment
Various exemplary embodiment of the present invention is described in detail now with reference to accompanying drawing.It should be noted that: unless specifically stated otherwise, otherwise positioned opposite, the numerical expression of the parts of setting forth in these embodiments and step and numerical value do not limit the scope of the invention.
Meanwhile, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not draw according to the proportionate relationship of reality.
Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the present invention and application or use.
May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in the appropriate case, technology, method and apparatus should be regarded as a part of authorizing specification.
In all examples with discussing shown here, any occurrence should be construed as merely exemplary, instead of as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to be further discussed it in accompanying drawing subsequently.
In existing up RS transmission mechanism, DM-RS and SRS is adopted to the transmission of fixing RS power, RS takies the resource units (Resource Element, RE) of fixed qty.For channel estimating, first channel estimation method (such as LS (the LeastSquare determined is utilized, least square method) channel estimation method, LMMSE (Linear minimummean square error, Linear Minimum Mean-Square Error Estimation) algorithm etc.) obtain the channel fading value of RE shared by RS; Then such as by the method for interpolation, the RE not configuring RS is carried out Interpolate estimation, to obtain the channel fading of required all RE, thus obtain complete channel information.
Supposing the system actual experience channel matrix is H, and the channel matrix drawn by RS channel estimating is
(generalized channel estimated value is made a general reference in order to the equivalent channel of demodulation and the channel fading in order to scheduling), then the power average of channel estimation errors
trend can be represented by Fig. 1.In Fig. 1, curve table is shown in the power average of the channel estimation errors in different signal to noise ratio (SNR) rank, and when SNR increases, channel estimation errors reduces thereupon, Ψ in Fig. 1
0representing when the very high situation lower channel evaluated error of SNR is by being tending towards a constant value, namely representing the error because Interpolate estimation brings.
It can thus be appreciated that the precision of channel estimation under different SNR is different.In existing LTE up link, the power of RS immobilizes, and makes the channel estimation errors when low SNR comparatively large, and affects overall system performance, comprise data demodulates performance and frequency selective scheduling ability.
In sum, the static RS power configuration strategy adopted in existing LTE system up link can not improve channel estimation quality, needs to define new RS power configuration strategy at elevator system aspect of performance.
Affect the problem of precision of channel estimation for RS power static configuration in current LTE system up link, the present invention openly proposes technical method, terminal and the system that a kind of up link RS power being suitable for LTE multiaerial system adjusts.Adjustment refers to the power by the real-time state information acquisition RS of channel, and the power ascension of RS is higher under low snr conditions in general, and under high SNR condition, RS power ascension reduces.
Fig. 2 illustrates the system schematic of an embodiment of multi-aerial radio communication system.As shown in Figure 2, this multi-aerial radio communication system comprises base station 21 and terminal 22.Base station 22 is such as LTE function base station, and the present invention is not limited base station.Terminal 22 such as comprises processor 201, memory 202, transmitter unit 203 and transmitting antenna 204.In transmitting procedure, base station 21 by RS power adjustment information needed in up link, such as, characterizes the signal of SNR or the direct power for RS, sends to terminal 22 in the downlink; In the uplink, terminal 22 according to the information obtained to RS (such as, SRS and DM-RS, or one of them) carry out power adjustment, this process can perform in processor 201 or memory 202, and then the RS that power adjusts together is launched by transmitting antenna 204 with other data by transmitter unit 203.
Fig. 3 illustrates the flow chart of an embodiment of uplink reference signal transmission of the present invention.
As shown in Figure 3, step 302, determines the uplink reference signals power of present frame according to the SNR of previous frame link.Previous frame link can comprise a frame or multiframe before up link or down link.Such as set the corresponding relation of uplink reference signals power and SNR in advance by test data or real network empirical value, obtain the uplink reference signals power corresponding with SNR according to this corresponding relation.
Step 304, terminal is based on the through-put power of the uplink reference signals power adjustment present frame uplink reference signals of present frame and transmitting uplink reference signal.Before the uplink reference signals sending present frame, terminal adjusts the through-put power sending uplink reference signals according to the uplink reference signals power obtained, and sends uplink reference signals with the power after adjusting.
In above-described embodiment, terminal adjusts the power of uplink reference signals according to the SNR in link, terminal can be made in the uplink to change RS power in real time according to channel circumstance, RS power is adjusted to improve precision of channel estimation under different SNR environment, can effectively promote uplink data demodulation performance, or/and improve uplink scheduling result; By the method for adjustment up link RS power, can elevator system coverage; In addition, dynamically control RS power can control coverage radius of cell flexibly under the prerequisite that terminal transmission gross power is certain, meets the primary demand of LTE coverage enhancement.
In one embodiment, can according to test data or real network empirical value setting " SNR-P
rScorresponding table ".The RS power boosting levels P that SNR scopes different in correspondence table is corresponding different
rS, and this table is placed in user terminal or base station (dB).Here is a SNR-P
rSthe example of corresponding table:
| SNR(dB) | P RS(dB) |
| ＜0 | 6dB |
| 0～3 | 5dB |
| 3～6 | 4dB |
| 6～9 | 3dB |
| 9～12 | 2dB |
| ＞12 | 1dB |
Table 1
It may be noted that only above table 1 form is that example is described, wherein numerical value does not limit scope of the present invention.Can be determined by detailed simulation analysis in practical application that this correspondence is shown, and does not limit this table content in the present invention.By arranging corresponding table, RS power can be obtained fast in processing procedure, alleviating the performance requirement to terminal or base station, improve processing speed.
In LTE, RS can take different resource unit (Recourse Element, RE), and its minimum thread is Resource Block (Resource Block, RB).Different resource unit takies different time-frequency location, may be different at different time-frequency location upper signal channel environment, and therefore, the SNR on different RE may be different, and the RS power on different RB just may occur difference.In one embodiment, for the RB of diverse location, calculate the SNR on different RB, and determine the position of this RB, use I
rSrepresent.
Fig. 4 illustrates the flow chart of another embodiment of uplink reference signal transmission of the present invention.This embodiment in the downlink base station by control signal or other high-level signalings by the SNR information feed back of the channel in up link to terminal, terminal obtains RS power boosting levels by the correspondence table of self configuration.
As shown in Figure 4, step 402, configures SNR-P in the terminal
rScorresponding table.According to real network empirical value setting " SNR-P
rScorresponding table ", RS power boosting levels P corresponding different according to different SNR scopes in table
rS, and this table is placed in user terminal (dB).
Step 404, base station calculates channel SNR by the channel condition information of previous frame up link, obtains Resource Block (RB) the position I needing to change RS power
rS.The CQI (Channel Quality Information, channel quality information) that such as this SNR can calculate for base station and this CQI corresponds to the side-play amount of concrete multiple antennas number.
Step 406, base station in downlink transmission by SNR and I
rSuser terminal is fed back to by Downlink Control Information (Downlink Control Information, DCI)/top signaling.
Step 408, terminal inquires about " SNR-P according to SNR
rScorresponding table ", obtain this I
rSthe RS power boosting levels P of corresponding RB position
rS.
Step 410, terminal is based on P
rSthe RS power carrying out present frame adjusts and starts uplink reference signals DM-RS and SRS and transfer of data.
In the above-described embodiments, SNR and RS positional information I
rScan be transmitted by Downlink Control Information DCI, also directly can be indicated by top signaling, not limit in the present invention.
In above-described embodiment, the requirement to terminal computing capability can be reduced by base station calculating SNR, terminal obtains RS power by tabling look-up can obtain rapidly the RS power corresponding with SNR, can arrange corresponding table, thus make the adjustment more accurate and effective of RS power for each terminal.
Fig. 5 illustrates the flow chart of another embodiment of uplink reference signal transmission of the present invention.In this embodiment, base station obtains the power boosting levels of terminal RS according to the correspondence table of the SNR in up link before and self configuration, and in the downlink, this power boosting levels is fed back to terminal by control signal or other high-level signalings by base station.
As shown in Figure 5, step 502, configures SNR-P in a base station
rScorresponding table.According to real network empirical value setting " SNR-P
rScorresponding table ", RS power level P corresponding different according to different SNR scopes in table
rS, and this table is placed in base station (dB).
Step 504, the channel condition information that base station is arrived by the uplink sounding of previous frame calculates SNR, and obtains the concrete RB position I that this user needs to promote RS power
rS, the CQI that such as this SNR can calculate for base station and this CQI corresponds to the side-play amount of concrete multiple antennas number.
Step 506, " SNR-P is inquired about by the SNR calculated in base station
rScorresponding table " information, obtain the RS power boosting levels P corresponding with SNR
rS.
Step 508, in the downlink, the P that base station will get
rSand I
rSuser terminal is sent to by Downlink Control Information (DCI)/top signaling.
Step 510, terminal in the up link of present frame based on P
rScarry out the RS power configuration of relevant position and start transfer of data.
In above-described embodiment, RS positional information I
rSand P
rScan be transmitted by control information in PDCCH, also directly can be indicated by top signaling, not limit in the present invention.
In above-described embodiment, calculate SNR by base station and acquisition RS power of tabling look-up, can reduce the requirement to terminal capability, base station obtains RS power by tabling look-up can obtain rapidly the RS power corresponding with SNR.
Fig. 6 illustrates the flow chart of another embodiment of uplink reference signal transmission of the present invention, this embodiment can be applied in the transmission system of feedback quantity very critical, wherein base station is specifically defined without the need to doing, terminal calculates SNR according to the channel information obtained in down link, by the power boosting levels of this SNR with terminal RS in the correspondence table acquisition up link of self configuration.
As shown in Figure 6, step 602, configures " SNR-P in the terminal
rScorresponding table ".According to real network empirical value setting " SNR-P
rScorresponding table ", the RS power boosting levels P that SNR scopes different in table is corresponding different
rS, and this table is placed in user terminal (dB).
Step 604, terminal calculates the SNR of previous frame down link by the channel status of the down link of previous frame, the SNR of each frequency domain position of computing terminal, this SNR can correspond to the side-play amount of concrete multiple antennas number for the CQI that calculates and this CQI, in current LTE system, terminal has supported that CQI calculates, and does not need Additional definitions.
Step 606, terminal estimates the SNR of present frame up link according to the SNR of previous frame down link.
Step 608, the present frame up link SNR that terminal is passed through to calculate is at " SNR-P
rScorresponding table " in inquire about, know the RS power boosting levels P on concrete RB position
rS.
Step 610, terminal in the up link of present frame based on P
rScarry out RS power configuration and start transfer of data.
In above-described embodiment, calculate SNR by terminal and acquisition RS power of tabling look-up, can reduce taking channel resource, terminal obtains RS power by tabling look-up can obtain rapidly the RS power corresponding with SNR.
By embodiment above, describe the RS power adjustment technology scheme of LTE uplink of multi-antenna system, " SNR-P in embodiment
rScorresponding table " different, between base station from terminal the feedback content of allocation position is different, transmission mechanism is different.
Above embodiment also can combine with the scheme of RS power static state/semi-static configuration, namely adopts the method for RS power ascension/control switch.This switch, by system upper-layer configured, determines RS power dynamic conditioning or static state/semi-static configuration.The typical signaling width of this switch is such as 1 bit, is configured by top signaling.
Technical scheme disclosed by the invention, compared with existing LTE up link RS transmission plan, according to transmission channel Environmental adjustments RS power, can improve precision of channel estimation, effective elevator system data demodulates performance and uplink scheduling ability.In addition, above-mentioned specific embodiment defines, respectively by " SNR-P for different feedback content
rScorresponding table " be placed in terminal or base station, define the different feedback mechanisms of application RS power adjustment technology.Compare with existing RS transmission plan, can change the power configuration of RS according to the real-time change of channel, be preferred transmission plan.The RS power adjustment technology scheme of the up link that the present invention openly proposes is a kind of technical solution of system, can be applicable in the up link of existing LTE system, forms LTE multiple antennas coverage reinforcing system.
Fig. 7 illustrates the structured flowchart of an embodiment of terminal of the present invention.As shown in Figure 7, in this embodiment, terminal 70 comprises power acquisition module 701, power regulation module 702 and signal transmission module 703.Power acquisition module 701 obtains the uplink reference signals power of present frame, and the uplink reference signals power of this present frame is determined according to the SNR of previous frame link.The uplink reference signals power of present frame can be determined according to the SNR of previous frame up link by base station or terminal; Or the SNR estimating present frame up link according to the SNR of previous frame down link by terminal, determines the uplink reference signals power of present frame according to the SNR of present frame up link; If determined the uplink reference signals power of present frame by base station, power acquisition module 701 receives this uplink reference signals power from base station.The uplink reference signals power of acquisition is sent to power regulation module 702 by power acquisition module 701.Power regulation module 702 receives this uplink reference signals power, based on the through-put power of the uplink reference signals power adjustment present frame uplink reference signals of this present frame; Signal transmission module 703 transmitting uplink reference signal.In one embodiment, by the uplink reference signals power of terminal according to the SNR information determination present frame of base station feedback, terminal 70 also comprises corresponding table memory module 704, for storing the correspondence table of SNR and reference signal power; Power acquisition module 701 receives the SNR of previous frame up link, determines the uplink reference signals power corresponding with the SNR of previous frame up link by the correspondence table of the SNR and reference signal power that inquire about the storage of corresponding table memory module 704.
In above-described embodiment, the Real-time Channel environment that power regulation module obtains according to power acquisition module promotes RS power, effectively can improve precision of channel estimation, elevator system data demodulates ability and uplink scheduling result.
Fig. 8 illustrates the structured flowchart of an embodiment of wireless communication system of the present invention.As shown in Figure 8, in this embodiment, system comprises base station 81 and terminal 80.Base station 81 calculates by the channel condition information of the up link of previous frame the SNR obtaining previous frame up link.Terminal 80 comprises power acquisition module 801, power regulation module 702 and signal transmission module 703.Power regulation module 702 and signal transmission module 703 can describe see the correspondence of above-described embodiment, for being not described in detail at this for purpose of brevity.Power acquisition module 801 comprises signal to noise ratio receiving element 8011 and power determining unit 8012.Signal to noise ratio receiving element 8011 receives the SNR of previous frame up link from base station, power determining unit 8012 receives the SNR of the previous frame up link from signal to noise ratio receiving element 8011, determine the uplink reference signals power of present frame according to the SNR of previous frame up link, the uplink reference signals power of the present frame determined is sent to power regulation module 702.In above-described embodiment, signal to noise ratio receiving element receives the SNR of previous frame up link from base station, power determining unit determines the uplink reference signals power of present frame according to the SNR of previous frame up link, realize dynamically promoting RS power according to Real-time Channel environment, effectively can improve precision of channel estimation.In addition, calculated the SNR of previous frame up link by base station, the performance requirement to terminal can be reduced.
Fig. 9 illustrates the structured flowchart of an embodiment of terminal of the present invention.As shown in Figure 9, in this embodiment, terminal 90 comprises snr computation module 900, power acquisition module 901, power regulation module 702 and signal transmission module 703.Power regulation module 702 and signal transmission module 703 can describe see the correspondence of above-described embodiment, for being not described in detail at this for purpose of brevity.Snr computation module 900 calculates the SNR of present frame up link by the channel condition information of the down link of previous frame, sends to power acquisition module 901; Power acquisition module 901 determines the uplink reference signals power of present frame according to the SNR of present frame up link.Such as, power acquisition module 901 determines the uplink reference signals power corresponding with the SNR of previous frame up link by the correspondence table of inquiry SNR and reference signal power.In above-described embodiment, calculate SNR by snr computation module and acquisition RS power of tabling look-up, can reduce taking channel resource, terminal obtains RS power by tabling look-up can obtain rapidly the RS power corresponding with SNR.
Figure 10 illustrates the structured flowchart of another embodiment of terminal of the present invention.As shown in Figure 10, in this embodiment, terminal 100 comprises power acquisition module 701, power regulation module 702, signal transmission module 703 and position acquisition module 1004.Power acquisition module 701, power regulation module 702 and signal transmission module 703 can describe see the correspondence of above-described embodiment, for being not described in detail at this for purpose of brevity.Position acquisition module 1004 obtains for transmitting the position of Resource Block of the uplink reference signals of required power adjustment in up link, according to the power delivery uplink reference signals of the position of this Resource Block and the RS of correspondence.
Suitable lifting RS through-put power effectively can improve precision of channel estimation, thus elevator system performance; But, can not blindly promote RS power.The present invention openly provides a kind of technical scheme being applicable to the adjustment RS power of LTE up link, terminal can be made in the uplink to change RS power in real time according to channel circumstance, under different SNR environment, adjust RS power to improve precision of channel estimation, effectively can promote uplink data demodulation performance or/and improve uplink scheduling result.By promoting the method for up link RS power, can elevator system coverage, in addition, dynamic control RS power can control coverage radius of cell flexibly under the prerequisite that terminal transmission gross power is certain, meets the primary demand of LTE coverage enhancement.In addition, low cubic metric weighs an important indicator of system transfers data peak-to-average force ratio, in up link design, this index occupies important proportion, and in up link, the low cubic metric of RS is lower compared to data, is conducive to the power ascension carrying out to a certain degree to RS.In sum, the RS power regulating method of LTE up link is a kind of technical solution being applicable to LTE uplink of multi-antenna system, meets the technical need of LTE coverage enhancement.
So far, described in detail according to uplink reference signal transmission of the present invention and terminal, system.In order to avoid covering design of the present invention, details more known in the field are not described.Those skilled in the art, according to description above, can understand how to implement technical scheme disclosed herein completely.
Method and system of the present invention may be realized in many ways.Such as, any combination by software, hardware, firmware or software, hardware, firmware realizes method and system of the present invention.Said sequence for the step of described method is only to be described, and the step of method of the present invention is not limited to above specifically described order, unless specifically stated otherwise.In addition, in certain embodiments, can be also record program in the recording medium by the invention process, these programs comprise the machine readable instructions for realizing according to method of the present invention.Thus, the present invention also covers the recording medium stored for performing the program according to method of the present invention.
Although be described in detail specific embodiments more of the present invention by example, it should be appreciated by those skilled in the art, above example is only to be described, instead of in order to limit the scope of the invention.It should be appreciated by those skilled in the art, can without departing from the scope and spirit of the present invention, above embodiment be modified.Scope of the present invention is limited by claims.
Claims (3)
1. a uplink reference signal transmission, is characterized in that, comprising:
According to the uplink reference signals power boosting levels P of the signal to noise ratio snr determination present frame of previous frame link
rS;
Terminal in the up link of present frame based on P
rScarry out uplink reference signals power configuration and start to transmit described uplink reference signals;
Wherein, the uplink reference signals power boosting levels P of the described signal to noise ratio snr determination present frame according to previous frame link
rSstep comprise:
Base station calculates the SNR of previous frame up link by the channel condition information of the up link of previous frame, obtains the Resource Block RB position I needing to change reference signal power
rS; Base station is by previous frame up link SNR and I
rSterminal is sent to by Downlink Control Information or top signaling; Terminal inquires about SNR and P preset according to previous frame up link SNR
rScorrespondence table, obtain this I
rSthe P of corresponding RB position
rS; Or,
Base station calculates the SNR of previous frame up link by the channel condition information that the uplink sounding of previous frame arrives, and obtains the Resource Block RB position I needing to promote reference signal power
rS; SNR and P preset is inquired about in base station according to the SNR of previous frame up link
rScorrespondence table, obtain the P corresponding with the SNR of previous frame up link
rS; In the downlink, base station will obtain P
rSand I
rSsend to terminal by Downlink Control Information or top signaling, so as terminal in the up link of present frame based on P
rScarry out the reference signal power configuration of relevant position; Or,
Terminal calculates the SNR of previous frame down link by the channel status of the down link of previous frame; Terminal estimates the SNR of present frame up link according to the SNR of previous frame down link; SNR and P that terminal is being preset by the SNR of the present frame up link calculated
rScorrespondence table inquire about, determine to need the Resource Block RB position I promoting reference signal power
rSon P
rS;
Wherein, SNR and P preset
rScorrespondence table in, the P that different SNR scope is corresponding different
rS.
2. a multiple antenna communication, is characterized in that, comprises terminal and base station, wherein:
Base station, the channel condition information for the up link by previous frame calculates the SNR of previous frame up link, obtains the Resource Block RB position I needing to change reference signal power
rS, by previous frame up link SNR and I
rSterminal is sent to by Downlink Control Information or top signaling; Or, calculate the SNR of previous frame up link at the channel condition information of the up link by previous frame, obtain the Resource Block RB position I needing to change reference signal power
rSafterwards, inquire about according to the SNR of previous frame up link SNR and P preset
rScorrespondence table, obtain the P corresponding with the SNR of previous frame up link
rS, in the downlink, the P that base station will obtain
rSand I
rSterminal is sent to by Downlink Control Information or top signaling;
Terminal, for receiving previous frame up link SNR and the I of base station transmission
rStime, SNR and P preset is inquired about according to previous frame up link SNR
rScorrespondence table, obtain this I
rSthe P of corresponding RB position
rS, and based on P in the up link of present frame
rScarry out uplink reference signals power configuration and start to transmit described uplink reference signals; Or, receiving the P of base station transmission
rSand I
rStime, based on P in the up link of present frame
rScarry out uplink reference signals power configuration and start to transmit described uplink reference signals; Or, calculated the SNR of previous frame down link by the channel status of the down link of previous frame, estimate the SNR of present frame up link according to the SNR of previous frame down link, SNR and P preset by the SNR of the present frame up link calculated
rScorrespondence table inquire about, determine to need the Resource Block RB position I promoting reference signal power
rSon P
rS, and based on P in the up link of present frame
rScarry out uplink reference signals power configuration and start to transmit described uplink reference signals.
3. system according to claim 2, is characterized in that, described multiple antenna communication is LTE multiple antenna communication.
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| CN201110378916.7A CN102413557B (en) | 2011-11-25 | 2011-11-25 | Uplink reference signal transmission method, terminal and multi-antenna communication system |
| PCT/CN2012/071926 WO2013075425A1 (en) | 2011-11-25 | 2012-03-05 | Uplink reference signal transmission method, terminal, and multi-antenna communication system |
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| US9674710B2 (en) * | 2013-12-20 | 2017-06-06 | Qualcomm Incorporated | Channel dependent coverage enhancement techniques in LTE |
| CN104901787B (en) * | 2014-03-07 | 2018-07-10 | 富士通株式会社 | Signal transmitting apparatus and multi-carrier communications systems |
| WO2017075789A1 (en) * | 2015-11-05 | 2017-05-11 | 华为技术有限公司 | Device, method, and system for transmitting reference signal |
| CN107734673B (en) * | 2016-08-12 | 2023-09-26 | 中兴通讯股份有限公司 | Information configuration method, device, base station and terminal |
| CN108377491B (en) | 2016-11-11 | 2021-06-22 | 华为技术有限公司 | Response method and device for uplink signal |
| CN112398619A (en) * | 2019-08-16 | 2021-02-23 | 上海朗桦通信技术有限公司 | Method and apparatus in a node used for wireless communication |
| CN113014365A (en) * | 2019-12-20 | 2021-06-22 | 中兴通讯股份有限公司 | Measurement reference signal mode adjusting device and method |
| CN111372313B (en) * | 2020-02-14 | 2022-11-04 | 西北大学 | LoRa uplink transmission system-based energy-efficient resource allocation method |
| CN111313951B (en) * | 2020-02-17 | 2022-01-25 | 南京邮电大学 | IRS (inter-Range instrumentation Standard) auxiliary secure communication wireless transmission method based on non-ideal CSI (channel State information) |
| CN112532363B (en) * | 2020-09-14 | 2022-04-22 | 中兴通讯股份有限公司 | SRS transmission method, terminal and storage medium |
| CN115915371A (en) | 2021-09-30 | 2023-04-04 | 南宁富联富桂精密工业有限公司 | Power control method and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1155149A (en) * | 1995-12-20 | 1997-07-23 | 富士通株式会社 | IC card system capable of adopting multiple sellers and method thereof |
| CN1522519A (en) * | 2001-06-29 | 2004-08-18 | 皇家菲利浦电子有限公司 | Signal to noise margin information for power control and bit rate adaptation in IEEE 802.11H wlan |
| CN1653715A (en) * | 2002-05-09 | 2005-08-10 | 诺基亚有限公司 | Multiple level power control command signaling |
| CN1764081A (en) * | 2004-10-22 | 2006-04-26 | 华为技术有限公司 | A power control method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101277132B (en) * | 2007-03-26 | 2013-06-05 | 华为技术有限公司 | Method and equipment for acquiring emitting power of upstream data |
| CN101741437B (en) * | 2008-11-19 | 2013-05-22 | ***通信集团公司 | Uplink power control method, system and equipment |
| CN101437284B (en) * | 2008-12-24 | 2010-08-11 | 华为技术有限公司 | Method, apparatus and system for determining emission power of physical down link sharing channel |
| KR20100088518A (en) * | 2009-01-30 | 2010-08-09 | 엘지전자 주식회사 | Method for transmitting reference signals in downlink multiple input multiple output |
-
2011
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-
2012
- 2012-03-05 WO PCT/CN2012/071926 patent/WO2013075425A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1155149A (en) * | 1995-12-20 | 1997-07-23 | 富士通株式会社 | IC card system capable of adopting multiple sellers and method thereof |
| CN1522519A (en) * | 2001-06-29 | 2004-08-18 | 皇家菲利浦电子有限公司 | Signal to noise margin information for power control and bit rate adaptation in IEEE 802.11H wlan |
| CN1653715A (en) * | 2002-05-09 | 2005-08-10 | 诺基亚有限公司 | Multiple level power control command signaling |
| CN1764081A (en) * | 2004-10-22 | 2006-04-26 | 华为技术有限公司 | A power control method |
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