CN102378275A - Method for obtaining enhanced channel quality indication information and apparatus thereof - Google Patents
Method for obtaining enhanced channel quality indication information and apparatus thereof Download PDFInfo
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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- H—ELECTRICITY
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- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H04B7/00—Radio transmission systems, i.e. using radiation field
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- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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Abstract
The invention provides a method for obtaining enhanced channel quality indication information and an apparatus thereof. In the invention, a demodulation reference signal is utilized to calculate a CQI (channel quality indicator). In addition, apart from utilizing the CQI based on the demodulation reference signal to carry out modulation coding, the CQI based on the demodulation reference signal also can be utilized to carry out calibration on CoMP (coordinative multiple point) transmission. The CQI or other implicit feedback such as a positive acknowledgement message and a negative acknowledgement message also can be utilized to calibrate the CoMP transmission.
Description
Technical field
The present invention relates to cordless communication network, relate in particular to the method and apparatus of the channel quality indication (CQI) information that obtains enhancing.
Background technology
At present; At third generation gpp (Third Generation Partnership Project; In 3GPP) the 8th edition (Rel.8); Channel quality indication (CQI) information (Channel QualityIndicator) be based on the specific reference signal in sub-district (Cell-specific Reference Signal, CRS).This CQI comprises three kinds of forms: the CQI in broadband, user terminal (User Equipment, the CQI of the subband of the CQI of the subband of UE) selecting and high-rise configuration.Agreed that in a recent meeting the tenth edition (Rel.10) CQI calculates the imagination of utilizing specific precoder based on the base station.
Summary of the invention
For adopt CRS or based on the reference signal of channel condition information (Channel StateInformation-Reference Signal, there is following shortcoming in the channel quality that CSI-RS) obtains indication:
1. the scheduling forecasting inaccuracy is true:
This scheduling information of forecasting comprises the channel pretreatment information, for example: the coordinate multipoint sub-district, also promptly: which is base stations united to carry out multi-cell cooperating, thereby is one or more subscriber terminal service jointly; (Precoding Matrix Index PMI), also is in the pre-coding matrix indication; The base station confirms to adopt the code word of which kind of precoding that channel is carried out precoding; And the pairing situation of user terminal, also promptly, for multi-user's multiple-input and multiple-output (Multi-User Multi-Input Multi-Output; MU-MIMO) under the scene, a plurality of data flow that one or more base stations will take identical running time-frequency resource send to the combination of which user terminal.Yet, because CRS or CSI-RS are the reference signals of channel precoding not, therefore; All do not comprise above-mentioned these channel pretreatment informations among CRS and the CSI-RS; Therefore, user terminal also is inaccurate based on the CQI that CRS and CSI-RS obtained, and can not reflect the actual conditions of channel.
2. in the sparse distribution of time domain and frequency domain:
(Resource Block, the distribution in RB) is very sparse, only comprises several CSI-RS to a sub-district in the Resource Block, thereby has caused calculating inaccurate of CQI at Resource Block for CSI-RS.
3. postpone:
Delay between CQI report and the object transmission has also influenced the performance of communication system.
Therefore, the present invention proposes a kind of method and apparatus that obtains the channel quality indication (CQI) information of enhancing, the present invention utilizes demodulated reference signal to be used for the calculating of CQI.
In addition, (Modulation and CodingScheme, MCS) beyond the selection, CQI also is hopeful to accomplish other function except utilizing CQI to carry out modulation coding mode.For example; Can utilize the feedback of CQI or other implicit expression, for example positive acknowledgement message (Acknowledge, ACK) and negative acknowledgment message (Not Acknowledge; NACK) carry out the crucial CSI calibration of CoMP (Coordinative Multiple Point, collaborative multiple spot) transmission.
According to a first aspect of the invention; A kind of method that in wireless communication network base station, is used for indicating user terminal feedback channel relevant information is provided; This method may further comprise the steps: A. is with the relevant information informing user terminal of demodulated reference signal; Wherein, said user terminal will utilize said demodulated reference signal to measure and the feedback channel quality indication information; B. said demodulated reference signal is carried out the channel preliminary treatment; D. send said through the pretreated demodulated reference signal of channel to said user terminal.
According to a second aspect of the invention; A kind of method that in the user terminal of cordless communication network, is used for feedback channel quality information is provided; This method may further comprise the steps: a. obtains the notice signaling from the base station of the said user terminal of administration; Wherein, said notice signaling is used to notify the relevant information of the demodulated reference signal that said user terminal is used to measure; B. according to the demodulated reference signal of said notice, the calculating channel quality is indicated; C. said channel quality indication is fed back to said base station.
According to a third aspect of the invention we, a kind of method that in wireless communication network base station, is used to compensate the reciprocal error of up-downgoing is provided, wherein, has may further comprise the steps:
I. with show or the latent informing user terminal that shows of information of reference signal, wherein, said user terminal utilizes said reference signal to measure and the feedback channel quality indication information;
II. utilize compensating parameter that said reference signal is compensated, measure to be used to carrying out descending channel information, wherein, said reference signal comprises cell special reference and/or channel state information reference signals and/or demodulated reference signal;
III. the reference signal after said user terminal sends said compensation;
IV. obtain and preserve the channel quality information that said user terminal feeds back obtains according to the reference signal after the said compensation;
Also comprise after the said step IV:
V. with the time period of predetermined length or with pre-determined number repeating said steps II to IV; Wherein, The Step II that repeats each time adopts identical compensating parameter, in said predetermined amount of time or said pre-determined number, to obtain the assembly average of a plurality of channel quality informations;
Also comprise after the said step V:
VI. every the wheel adopted different compensating parameters respectively; Time period or the many wheels of said pre-determined number group with said predetermined length repeat said Step II to V; Obtaining the assembly average of a plurality of channel quality informations respectively, and the size of the assembly average of more said a plurality of channel quality informations;
Also comprise after the said step VI:
VII. in the assembly average with said a plurality of channel quality informations, the corresponding compensating parameter of assembly average with maximum channel quality information is used for compensate for channel.
According to a forth aspect of the invention, a kind of method that in wireless communication network base station, is used to compensate the reciprocal error of up-downgoing is provided, wherein, has may further comprise the steps:
M. utilize compensating parameter to compensate to sent a plurality of data;
N. obtain and preserve that said user terminal fed back in the time period of predetermined length to one group of response message of said a plurality of data through overcompensation, wherein, this group response message comprises positive acknowledgement message and/or negative acknowledgment message;
O. calculate the ratio of positive acknowledgement message and negative acknowledgment message in the time period of said predetermined length;
Also comprise after the said step O:
-with the time period of said predetermined length or with pre-determined number repeating said steps M to O; Wherein, Each is taken turns and adopts different compensating parameters among the step M of repetition; Take turns said predetermined amount of time or the corresponding many group response messages of said pre-determined number to obtain with each, and the said ratio in more said many groups;
With in said many group response messages, be used for compensate for channel with one group of the highest corresponding compensating parameter of response message of said ratio.
According to a fifth aspect of the invention, a kind of first device that in wireless communication network base station, is used for indicating user terminal feedback channel relevant information is provided, this first device comprises:
Notifying device is used for the relevant information informing user terminal with demodulated reference signal, and wherein, said user terminal will utilize said demodulated reference signal to measure and the feedback channel quality indication information;
Pretreatment unit is used for said demodulated reference signal is carried out the channel preliminary treatment;
Dispensing device is used for sending to said user terminal said through the pretreated demodulated reference signal of channel.
According to a sixth aspect of the invention, a kind of second device that in the user terminal of cordless communication network, is used for feedback channel quality information is provided, this second device comprises:
Deriving means is used to obtain the notice signaling from the base station of the said user terminal of administration, and wherein, said notice signaling is used to notify the relevant information of the demodulated reference signal that said user terminal is used to measure;
Calculation element is used for the demodulated reference signal according to said notice, the indication of calculating channel quality;
Feedback device is used for said channel quality indication is fed back to said base station.
Adopt scheme of the present invention,, can in the performance of obtaining, only need less feedback overhead, and reduce the complexity of calculating for system with spatial coherence.
Description of drawings
Through with reference to the detailed description of being done below the advantages to non-limiting example, other features, objects and advantages of the present invention will become more obvious.
Fig. 1 shows the systems approach flow chart according to a specific embodiment of the present invention;
Fig. 2 shows the sequential chart according to a specific embodiment of the present invention;
Fig. 3 shows the sketch map based on the CoMP of CRS transmission according to a specific embodiment of the present invention;
Fig. 4 shows the device block diagram according to a specific embodiment of the present invention.
Wherein, same or analogous Reference numeral is represented same or analogous steps characteristic or device/module.
Embodiment
In the present invention, we are that example describes with the multipoint cooperative sub-district.Wherein, base station 1 is the dominant base of user terminal 2.It will be understood by those skilled in the art that the present invention is equally applicable to single cell wireless communication system.
Fig. 1 shows the systems approach flow chart according to an embodiment of the present invention.At first, in step S10, base station 1 is with the relevant information informing user terminal 2 of demodulated reference signal, and wherein, user terminal 2 utilizes this demodulated reference signal to measure and the feedback channel quality indication information.Wherein, the relevant information of this demodulated reference signal comprises the sequence number of this DMRS, and that position or this DMRS adopt is which kind of sequence (sequence).
This demodulated reference signal comprises the demodulated reference signal that is not used for the demodulation Physical Downlink Shared Channel or is used for the demodulated reference signal of demodulation Physical Downlink Shared Channel.When demodulated reference signal is used for the demodulation Physical Downlink Shared Channel; The characteristic of channel that this demodulated reference signal experienced is identical with the characteristic of channel that the information sharing channel is experienced; Therefore, the DMRS that is used for demodulation PDSCH channel is applicable to and also is the channel of smooth variation; When next channel constantly that utilizes DMRS prediction remains unchanged with the current PDSCH characteristic of channel that is used to transmit data, be accurately based on the channel feedback information in next moment that CQI fed back of DMRS; Therefore and work as demodulated reference signal is not to be used for the demodulation Physical Downlink Shared Channel, because this DMRS need not bind together with PDSCH; This DMRS has the freedom of height, can carry out the channel preliminary treatment that next need carry out constantly to this DMRS neatly according to scheduling strategy; For example, DMRS can be without the channel precoding, and because the density of DMRS is higher than the density of CSI-RS; Therefore, can be used as the CSI-RS of enhancing; In addition, DMRS can adopt the PMI different with the PMI that gives tacit consent to; And community associated and based on the user pairing of transmission next time, thereby predict next characteristic of channel transmitted next time constantly exactly based on the CoMP of transmission next time.
In addition, base station 1 can adopt the descending control indication of user terminal special-purpose (UE specific) (Downlink Control Indicator, DCI) the signaling indication is used for user terminal 1 and carries out DMRS that CQI measures and be positioned at which or which resource (ResourceElement; RE) information, thus user terminal 1 can carry out CQI and measure according to the DMRS of this indication; Wherein, the information of this DMRS comprises the position of this DMRS, for example; This DMRS is arranged on which RE of Resource Block; Also promptly, corresponding to which time-domain symbol and subcarrier in frequency domain, carry out index with the sequence number of time domain and frequency domain respectively.
Consider and adopt the information of the special-purpose signaling indication DMRS of user terminal to cause bigger signaling consumption, alternatively, also can adopt the indication signaling of cell-specific to be used to indicate the DMRS that is used to carry out the CQI measurement.For example, base station 1 can dispose specific subframe as being used for the DMRS that CQI measures, and also promptly, base station 1 keeps some DMRS port and is used for the CQI measurement.Can pass through high-level signaling, for example radio resource control signaling (Radio ResourceControl, RRC); Perhaps implicit expression; For example combine SFN (Single FrequencyNetwork, the mode of sequence number SFN), the DMRS that is used for the CQI measurement that definition is reserved; Then, user terminal is triggered and carries out the measurement of CQI according to the indicated DMRS of these signalings.
Then, in step S11, the 1 pair of demodulated reference signal in base station carries out the channel preliminary treatment.Preferably, this be used for user terminal 2 carry out DMRS that CQI measures the channel preliminary treatment of process when transmitting next time channel the preliminary treatment of process identical.
Then, in step S13, send to user terminal 2 base station 1 should be through the pretreated demodulated reference signal of channel.
Then, in step S14, user terminal 2 is according to the demodulated reference signal of this notice, and the calculating channel quality is indicated.
Then, in step S15, user terminal 2 feeds back to base station 1 with the channel quality indication of calculating again.
In the above embodiments; In step S10; Send after to comprise signaling that indication is used for the DMRS that CQI measures be to consider that user terminal 2 is receiving this signaling to user terminal 2 earlier base station 1, need carry out demodulation, thereby cause certain delay; For user terminal 2 can in time perhaps these be used for the DMRS that CQI measures, need in advance these indication signalings are sent to user terminal 2.Certainly, those skilled in the art are appreciated that fully between above-mentioned steps S10 and the step S11 and also can walk abreast that perhaps step S11 is sent in before the step S10.
Fig. 2 shows the sequential chart according to above-mentioned execution mode of the present invention.Compare with traditional CQI, the report of adopting untapped DMRS to carry out CQI has prolonged the interval between the transmission of transmission and " reality " of " prediction ", and is as shown in Figure 2.It will be understood by those skilled in the art that the blanking time between the two is short more, channel estimating information is accurate more.
In order to reduce the interval of this prolongation, need to select suitable the shortest downlink transfer and the up report mechanism that postpones that have.For the TDD system, can adopt that (Sounding Reference Signal SRS), thereby does not need actual downlink transfer based on acyclic detection reference signal.For the FDD system, adopt descending CRS or DMRS and, can remove up report, and shorten processing delay based on up long-term precoding matrix indicators.
In the embodiment of a variation, consider the mismatch of the radio frequency between the antenna of each base station of many sub-districts, also be; The radio circuit of transmitting set and the radio circuit of wireless receiver have very big difference; Therefore, caused the error of reciprocity between the uplink and downlink of channel, and traditional self calibration can not solve the radio frequency mismatch problems between many sub-districts fully; Therefore, can adopt CQI to calibrate the RF match error between many antennas based on DMRS.Below, be that example describes with two base stations.Certainly, it will be understood by those skilled in the art that following described technical scheme can extend to the multi-cell cooperating system more than two base stations fully.
Be illustrated respectively in 1 * M vector with
and
, be illustrated respectively in the channel parameter of the uplink and downlink between the single antenna of M transmit antennas and CoMP user terminal of i sub-district.Therefore, the radio frequency mismatch between antenna 1 and the antenna 2 can be expressed as:
Wherein, σ representes energy; It also is the side-play amount of amplitude; And the side-play amount of
expression phase place; σ is the compensating parameter
that acts on the antenna with
and representes i element in
and
respectively, and mean representes to get repeatedly measurements and calculations result's mean value.
For example, base station 1 and base station 3 be collaborative to be user terminal 2 services, and then after the 1 couple of DMRS in step S11 base station carries out the channel preliminary treatment, and at step S13, base station 1 is sent and also comprised following set-up procedure S12 after this reference signal:
The CoMP cooperation cell is according to relative amplitude between maximum likelihood class (Maximum Likelihood-alike, ML alike) method adjustment base station 3 and the base station 1 and the error between the phase place.Specifically, the step S12 of this adjustment can be divided into:
Substep S120: if the possible relative phase deviation range between the antenna of base station 1 and base station 3 is between
; Then the hunting zone at
wherein; G representes the stepping by the determined search of precision of calibration; For example; If hope the ERROR CONTROL of final calibration in the scope of
, then g can value representes in each circulation the increment with respect to a last cycle phase for
this g.And; With to the adjustment of phase place similarly; Can the adjusting range and the stepping of amplitude be defined as
wherein; 0.1dB be the stepping of amplitude adjustment, hereinafter, 0.1dB is expressed as s.For example; When initial; Base station 1 is confirmed will
value be
as first compensating parameter, and the antenna of base station 1 and base station 3 is compensated.The calibration process to antenna that occurs hereinafter also promptly refers to antenna is compensated.
Substep S121: then; Base station 1 and base station 3 are with high specific (Maximum RatioTransmission; MRT) send mode adopts following formula that separately transmitting antenna is compensated respectively; Also promptly, after step S12 DMRS to be sent was passing through the channel preliminary treatment of base band, the formula below radio frequency adopts compensated DMRS to be sent further:
For the antenna of base station 1, compensation formula is:
For the antenna of base station 3, compensation formula is
Substep S122: the DMRS that send after overcompensation to user terminal 2 base station 1 and base station 3.
Substep S123: base station 1 obtains and preserves that user terminal 2 fed back according to the CQI that DMRS fed back after this compensation.
Substep S124: base station 1 with identical compensating parameter σ and
also is; Still adopt
parameter by way of compensation; Repeat above-mentioned substep S121 to S123, until satisfying predetermined condition.This predetermined condition for example comprises:
The DMRS that base station 1 repeats to send through
parametric compensation reaches the time period of predetermined length; The number of times that perhaps repeats to send reaches pre-determined number; Then; Base station 1 is according to the CQI of each feedback; Calculate the assembly average of the CQI of these feedbacks, thereby accomplish the compensation of an antenna of taking turns.
Then, the compensation of the antenna of next round is carried out in base station 1.For example; Base station 1 is adjusted σ and
according to the value of g and s.With
value also is that above-mentioned substep S121 is repeated to substep S124 according to
more again in
base station 1 for
; After iteron step S121 and substep S124 satisfy above-mentioned predetermined condition; Also be; After the time span that repeats or the number of times of repetition have satisfied preset time length or predetermined number of repetition, calculate the assembly average that this takes turns the CQI after the compensation again.Then; Progressively increase the again value of σ and
; And repeat above-mentioned substep S121 to substep S124; Until all combinations that traveled through in
and
; Thereby obtain the assembly average that each makes up corresponding a plurality of channel quality informations respectively, and the size of the assembly average of these a plurality of channel quality informations relatively.
Then, base station 1 is chosen in the assembly average of these a plurality of channel quality informations, is used for compensate for channel with the corresponding compensating parameter of assembly average of maximum channel quality information.
In one embodiment; Based on the simulation parameter that table one sets, table two shows corresponding and the simulation result of each compensating parameter to the mean value of
corresponding CQI.
Table one
| Parameter | Assum?ption |
| Channel model | SCM?Case?C |
| Bandwidth | 10M |
| CQI postpones | 5ms |
| Carrier frequency | 2.0GHz |
| Rate travel | 3Km/h |
| The user terminal number | 570 |
| The sub-district number | 19 |
| Descending control DL CE | Desirable |
| The Resource Block that is scheduled | 10 Resource Block (RB) |
| The |
1 Resource Block (RB) |
| The UE rate travel | 3km/h |
| Simulation time | 216 Transmission Time Intervals (TTI) |
Table two
From table two, can find out at an easy rate, be very accurately based on the calibration of the CQI of DMRS.In addition; Carry out assisted calibration, for example if preferred user terminal is selected,, for example select the slow user terminal of rate travel according to certain rule; Perhaps select not carry out the user terminal that switch the sub-district; The user terminal that perhaps is in the centre position of a plurality of base stations in distance C oMP bunch of cell edge is calibrated, and perhaps adopts longer timing statistics, and then the performance of calibration will further improve.
In above-mentioned emulation, we suppose that the calibration in the sub-district accomplishes.Having 4 antennas with a base station is example, when the sub-district internal calibration has been accomplished, means that 4 antennas of a base station are calibrated.
Certainly, the present invention is applicable to the unregulated situation of antenna in the sub-district too.When if the antenna in the sub-district is not calibrated, at first fixing antenna, other antennas during alternately is selected CoMP bunch are adjusted according to formula (1) and formula (2).
In each above-mentioned embodiment, the scheme that compensates according to the CQI based on DMRS has been described.Be appreciated that and also can adopt the calibration of carrying out the antenna of many base stations based on the CQI of CRS/CSI-RS except CQI based on DMRS.
Fig. 3 shows the sketch map according to the antenna of this embodiment.Wherein, 8 transmit antennas have been shown among the figure, 8 reception antennas.Therefore the scheme of antenna compensation and above-mentioned step S12 all fours, do not repeat them here.
Calibration process is for the influence of CRS CoMP transmission
-for the influence of PDSCH:
For not influence of Cell Edge User.For Cell Center User, of Fig. 3, because the antenna of serving this sub-district originally is when carrying out the CoMP cooperation; Need serve the user terminal of neighbor cell; Therefore, common CRS position, the interference that can bring average 0dB for the minizone; This may reduce the detection performance of PDSCH, but can compensate through the selection of modulation coding mode.
-for the influence of PDCCH:
With PDSCH similarly, the robustness (non-time shift characteristic) of PDCCH channel is considered in the interference that usually can bring average 0dB to PDCCH for the user terminal of center of housing estate, these interference are acceptables.In addition; If necessary; Can pass through frequency division multiplexing (Frequency Division Multiplexing, FDM comprise the carrier dispatching of striding among the Rel.10) and time division multiplexing (Time Division Multiplexing; TDM adopts different OFDM symbols for different sub-district) etc. mode eliminate interference.
It should be noted that these influences only occur in calibration phase, it only takies the sub-fraction of whole call duration time.
Because CRS is with through operation such as predefined scrambler, the corresponding information of indicating user terminal CRS so that user terminal measures, and does not need the signaling indication, therefore is called the advice method of implicit expression.
Certainly; It is relevant to it will be understood by those skilled in the art that above-mentioned feedback of how to carry out CQI and concrete UE realize, those skilled in the art fully can content disclosed according to the present invention; Utilize more than a kind of reference signal to calculate CQI, as long as the definition compliant of CQI.
In each above-mentioned embodiment, we all utilize CQI information to carry out the calibration between the antenna of many base stations.Except CQI information, we can also utilize thick feedback information, and for example ACK or NACK message are carried out the calibration between the antenna of many base stations.
For example, at first, base station 1 utilizes compensating parameter, and CoMP mode and base station are 3 that cooperate to adopting, a plurality of data to be sent compensate, and compensation formula is identical with formula (2) with formula (1).
Then, base station 1 obtains and preserves that user terminal 2 fed back to this response message through a plurality of data of overcompensation in the time period of predetermined length, and wherein, this group response message comprises positive acknowledgement message and/or negative acknowledgment message.
Then, the ratio of positive acknowledgement message and negative acknowledgment message in the time period of this predetermined length is calculated in base station 1.
Then; Base station 1 selects another to compensating parameter; And time period of this predetermined length or with pre-determined number continue to send through this another to a plurality of data that compensating parameter was compensated; With obtain with this another to the pairing one group of response message of compensating parameter, and calculate and this ratio corresponding positive acknowledgement message of compensating parameter and negative acknowledgment message.Base station 1 selects different compensating parameters right, and repeats above-mentioned step, has traveled through the right combination of all possible compensating parameter until base station 1.
Then, the many groups positive acknowledgement message that base station 1 relatively obtains and the ratio of negative acknowledgment message, and general's one group of pairing compensating parameter that wherein ratio is the highest is as the compensating parameter of transmission channel.
More than from the angle of systems approach, a plurality of embodiment of the present invention are described.Below, will be from the angle of device, the description that embodiments of the invention are summarized.
Fig. 4 shows the device block diagram according to a specific embodiment of the present invention.Wherein, first device 10 is arranged in base station 1, the second device 20 and is arranged in user terminal 2.First device 10 comprises notifying device 100, pretreatment unit 101 and dispensing device 102.Second device 20 comprises deriving means 200, calculation element 201 and feedback device 202.
At first notifying device 100 is used for the relevant information informing user terminal with demodulated reference signal, and wherein, said user terminal will utilize said demodulated reference signal to measure and the feedback channel quality indication information.
Then, deriving means 200 is used to obtain the notice signaling from the base station of the said user terminal of administration, and wherein, said notice signaling is used to notify the relevant information of the demodulated reference signal that said user terminal is used to measure.
Then, pretreatment unit 101 is used for said demodulated reference signal is carried out the channel preliminary treatment.
Then, dispensing device 102 is used for sending to said user terminal said through the pretreated demodulated reference signal of channel.
Then, calculation element 201 is used for the demodulated reference signal according to said notice, the indication of calculating channel quality;
At last, feedback device 202 is used for said channel quality indication is fed back to said base station.
Need to prove that the foregoing description only is exemplary, but not limitation of the present invention.Any technical scheme that does not deviate from spirit of the present invention all should fall within protection scope of the present invention, and this comprises the different technologies characteristic that use occurs in different embodiment, and dispatching method can make up, to obtain beneficial effect.In addition, should any Reference numeral in the claim be regarded as limit related claim; " comprise " that a speech do not get rid of device unlisted in other claim or the specification or step; " one " before the device does not get rid of the existence of a plurality of such devices; In comprising the equipment of multiple arrangement, the one or more function in this multiple arrangement can be realized by same hardware or software module; Words such as " first ", " second ", " the 3rd " only are used for representing title, and do not represent any specific order.
Claims (15)
1. method that in wireless communication network base station, is used for indicating user terminal feedback channel relevant information, this method may further comprise the steps:
A. with the relevant information informing user terminal of demodulated reference signal, wherein, said user terminal will utilize said demodulated reference signal to measure and the feedback channel quality indication information;
B. said demodulated reference signal is carried out the channel preliminary treatment;
D. send said through the pretreated demodulated reference signal of channel to said user terminal.
2. method according to claim 1 wherein, also comprises after the said step B, before the said step D:
C. utilize compensating parameter that the pretreated demodulated reference signal of said process is compensated, measure to be used to carrying out descending channel information;
Said step D also comprises: send said demodulated reference signal through overcompensation to said user terminal;
Also comprise after the said step D:
E. obtain and preserve the channel quality that demodulated reference signal the obtained indication that said user terminal feeds back according to said compensation;
F. with the time period of predetermined length or with pre-determined number repeating said steps C to E; Wherein, The step C that repeats each time adopts identical compensating parameter, in said predetermined amount of time or said pre-determined number, to obtain an assembly average of channel quality information;
Also comprise after the said step F:
G. every the wheel adopted different compensating parameters respectively; Time period or said pre-determined number group with said predetermined length are taken turns repeating said steps C to F more; Obtaining the assembly average of a plurality of channel quality informations respectively, and the size of the assembly average of more said a plurality of channel quality informations;
Also comprise after the said step G:
H. in the assembly average with said a plurality of channel quality informations, the corresponding compensating parameter of assembly average with maximum channel quality information is used for compensate for channel.
3. method according to claim 1 and 2 wherein, also comprises before the said steps A:
-obtain the pre-coding matrix that feeds back from said user terminal to indicate;
-according to said pre-coding matrix indication, confirm scheduling strategy, wherein, said scheduling strategy comprises said channel pretreatment mode.
4. method according to claim 1 and 2 wherein, also comprises before the said steps A:
-obtain aperiodicity uplink detection signal from said user terminal;
-according to said aperiodicity uplink detection signal, confirm scheduling strategy, wherein, said scheduling strategy comprises said channel pretreatment mode.
5. according to each described method in the claim 1 to 4, wherein, said steps A also comprises:
-explicitly notifies said user terminal to be used for the reference signal information of the cell-specific of the required monitoring of calculating channel quality information.
6. according to each described method in the claim 1 to 5, wherein, said demodulated reference signal comprises the demodulated reference signal that is not used for the demodulation Physical Downlink Shared Channel or is used for the demodulated reference signal of demodulation Physical Downlink Shared Channel.
7. according to each described method in the claim 1 to 6, wherein, said channel preliminary treatment comprises base station multipoint cooperative and/or precoding mode and/or user terminal pairing.
8. method that in the user terminal of cordless communication network, is used for feedback channel quality information, this method may further comprise the steps:
A. obtain the notice signaling of base station from the said user terminal of administration, wherein, said notice signaling is used to notify the relevant information of the demodulated reference signal that said user terminal is used to measure;
B. according to the demodulated reference signal of said notice, the calculating channel quality is indicated;
C. said channel quality indication is fed back to said base station.
9. method according to claim 8 wherein, also comprises before the said step a:
-to the long-term pre-coding matrix indication information of said base station feedback.
10. method according to claim 8 wherein, also comprises before the said step a:
-receiving detectable signal request message from said base station, described request message is used to ask said user terminal to send aperiodic detectable signal to said base station;
-send aperiodic detectable signal to said base station.
11. a method that in wireless communication network base station, is used to compensate the reciprocal error of up-downgoing wherein, may further comprise the steps:
I. with show or the latent informing user terminal that shows of information of reference signal, wherein, said user terminal utilizes said reference signal to measure and the feedback channel quality indication information;
II. utilize compensating parameter that said reference signal is compensated, measure to be used to carrying out descending channel information, wherein, said reference signal comprises cell special reference and/or channel state information reference signals and/or demodulated reference signal;
III. the reference signal after said user terminal sends said compensation;
IV. obtain and preserve the channel quality information that said user terminal feeds back obtains according to the reference signal after the said compensation;
Also comprise after the said step IV:
V. with the time period of predetermined length or with pre-determined number repeating said steps II to IV; Wherein, The Step II that repeats each time adopts identical compensating parameter, in said predetermined amount of time or said pre-determined number, to obtain the assembly average of a plurality of channel quality informations;
Also comprise after the said step V:
VI. every the wheel adopted different compensating parameters respectively; Time period or the many wheels of said pre-determined number group with said predetermined length repeat said Step II to V; Obtaining the assembly average of a plurality of channel quality informations respectively, and the size of the assembly average of more said a plurality of channel quality informations;
Also comprise after the said step VI:
VII. in the assembly average with said a plurality of channel quality informations, the corresponding compensating parameter of assembly average with maximum channel quality information is used for compensate for channel.
12. a method that in wireless communication network base station, is used to compensate the reciprocal error of up-downgoing wherein, may further comprise the steps:
M. utilize compensating parameter to compensate to sent a plurality of data;
N. obtain and preserve that said user terminal fed back in the time period of predetermined length to one group of response message of said a plurality of data through overcompensation, wherein, this group response message comprises positive acknowledgement message and/or negative acknowledgment message;
O. calculate the ratio of positive acknowledgement message and negative acknowledgment message in the time period of said predetermined length;
Also comprise after the said step O:
-with the time period of said predetermined length or with pre-determined number repeating said steps M to O; Wherein, Each is taken turns and adopts different compensating parameters among the step M of repetition; Take turns said predetermined amount of time or the corresponding many group response messages of said pre-determined number to obtain with each, and the said ratio in more said many groups;
With in said many group response messages, be used for compensate for channel with one group of the highest corresponding compensating parameter of response message of said ratio.
13. first device that in wireless communication network base station, is used for indicating user terminal feedback channel relevant information, this first device comprises:
Notifying device is used for the relevant information informing user terminal with demodulated reference signal, and wherein, said user terminal will utilize said demodulated reference signal to measure and the feedback channel quality indication information;
Pretreatment unit is used for said demodulated reference signal is carried out the channel preliminary treatment;
Dispensing device is used for sending to said user terminal said through the pretreated demodulated reference signal of channel.
14. first device according to claim 13 also comprises:
Compensation arrangement is used to utilize compensating parameter that the pretreated demodulated reference signal of said process is compensated, and measures to be used to carrying out descending channel information;
Said dispensing device also is used for, and sends said demodulated reference signal through overcompensation to said user terminal;
Said first device also comprises:
Save set is used to obtain and preserve the channel quality that demodulated reference signal the obtained indication according to said compensation that said user terminal feeds back;
Said first device also is used for; With the time period of predetermined length or with pre-determined number repeating said steps C to E; Wherein, the step C that repeats each time adopts identical compensating parameter, in said predetermined amount of time or said pre-determined number, to obtain an assembly average of channel quality information;
The every wheel adopted different compensating parameters respectively; Time period or said pre-determined number group with said predetermined length are taken turns repeating said steps C to F more; Obtaining the assembly average of a plurality of channel quality informations respectively, and the size of the assembly average of more said a plurality of channel quality informations;
In the assembly average with said a plurality of channel quality informations, be used for compensate for channel with the corresponding compensating parameter of assembly average of maximum channel quality information.
15. second device that in the user terminal of cordless communication network, is used for feedback channel quality information, this second device comprises:
Deriving means is used to obtain the notice signaling from the base station of the said user terminal of administration, and wherein, said notice signaling is used to notify the relevant information of the demodulated reference signal that said user terminal is used to measure;
Calculation element is used for the demodulated reference signal according to said notice, the indication of calculating channel quality;
Feedback device is used for said channel quality indication is fed back to said base station.
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| CN201010253111.5A CN102378275B (en) | 2010-08-13 | 2010-08-13 | A kind of method and apparatus obtaining the channel quality indication (CQI) information of enhancing |
| PCT/IB2011/002072 WO2012020312A2 (en) | 2010-08-13 | 2011-07-29 | A method and device for obtaining enhanced channel quality indicator |
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Also Published As
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|---|---|
| CN102378275B (en) | 2015-08-05 |
| WO2012020312A3 (en) | 2012-06-28 |
| WO2012020312A2 (en) | 2012-02-16 |
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