CN102378275B - A kind of method and apparatus obtaining the channel quality indication (CQI) information of enhancing - Google Patents
A kind of method and apparatus obtaining the channel quality indication (CQI) information of enhancing Download PDFInfo
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- CN102378275B CN102378275B CN201010253111.5A CN201010253111A CN102378275B CN 102378275 B CN102378275 B CN 102378275B CN 201010253111 A CN201010253111 A CN 201010253111A CN 102378275 B CN102378275 B CN 102378275B
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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
- H04L1/0001—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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- 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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- 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
- H04L25/0224—Channel estimation using sounding signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- 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 present invention proposes a kind of method and apparatus obtaining the channel quality indication (CQI) information of enhancing, the present invention utilizes demodulated reference signal to carry out the calculating of CQI.In addition, except utilizing the CQI based on demodulated reference signal to carry out except modulation coding mode selection, the CQI based on restituted signal can also be utilized to calibrate CoMP transmission.Can also utilize the feedback of CQI or other implicit expression, such as positive acknowledgement message and negative acknowledgment message are calibrated CoMP transmission.
Description
Technical field
The present invention relates to cordless communication network, particularly relate to the method and apparatus obtaining the channel quality indication (CQI) information strengthened.
Background technology
At present, at third generation Partnership Program (Third Generation Partnership Project, in the 8th edition (Rel.8) 3GPP), channel quality indication (CQI) information (Channel QualityIndicator) is based on the specific reference signal in community (Cell-specific Reference Signal, CRS).This CQI comprises three kinds of forms: the CQI of the CQI of the subband that the CQI in broadband, user terminal (User Equipment, UE) are selected and the subband of high-rise configuration.In recent meeting, agreed to that the tenth edition (Rel.10) CQI calculates the imagination utilizing specific precoder based on base station.
Summary of the invention
For adopting CRS or based on the channel quality instruction that the reference signal (Channel StateInformation-Reference Signal, CSI-RS) of channel condition information obtains, there is following shortcoming:
1. dispatch forecasting inaccuracy true:
This scheduling information of forecasting comprises channel pretreatment information, such as: coordinate multipoint community, also namely: which is base stations united carries out multi-cell cooperating, thus is one or more subscriber terminal service jointly; Pre-coding matrix instruction (Precoding Matrix Index, PMI), also be, base station is determined to adopt the code word of which kind of precoding to carry out precoding to channel, and the pairing situation of user terminal, also, for multi-user's multiple-input and multiple-output (Multi-User Multi-Input Multi-Output, MU-MIMO), under scene, one or more base station will take multiple data flow of identical running time-frequency resource to the combination of which user terminal.But, because CRS or CSI-RS is the reference signal of non-channel precoding, therefore, these channel pretreatment informations above-mentioned are not all comprised in CRS and CSI-RS, therefore, user terminal is also inaccurate based on the CQI that CRS and CSI-RS obtains, and can not reflect the actual conditions of channel.
2. in the sparse distribution of time domain and frequency domain:
The distribution of CSI-RS in Resource Block (Resource Block, RB) is very sparse, only comprises several CSI-RS, thus cause the inaccurate of the calculating of CQI in a Resource Block for a community.
3. postpone:
Delay between CQI and object transmission also have impact on the performance of communication system.
Therefore, the present invention proposes a kind of method and apparatus obtaining the channel quality indication (CQI) information of enhancing, the present invention utilizes demodulated reference signal for the calculating of CQI.
In addition, carry out beyond modulation coding mode (Modulation and CodingScheme, MCS) selects except utilizing CQI, CQI has also been hopeful other function.Such as, the feedback of CQI or other implicit expression can be utilized, such as positive acknowledgement message (Acknowledge, and negative acknowledgment message (Not Acknowledge ACK), NACK) the CSI calibration very important to CoMP (Coordinative Multiple Point, collaborative multiple spot) transmission is carried out.
According to a first aspect of the invention, provide a kind of method being used to indicate user terminal feedback channel relevant information in the base station of cordless communication network, the method comprises the following steps: A. is by the relevant information informing user terminal of demodulated reference signal, wherein, described user terminal will utilize described demodulated reference signal to measure and feedback channel quality indication information; B. channel preliminary treatment is carried out to described demodulated reference signal; D. send described through the pretreated demodulated reference signal of channel to described user terminal.
According to a second aspect of the invention, provide a kind of in the user terminal of cordless communication network the method for feedback channel quality information, the method comprises the following steps: a. obtains the notice signaling of the base station from the described user terminal of administration, wherein, described notice signaling is for notifying the relevant information of demodulated reference signal of described user terminal for measuring; B. according to the demodulated reference signal of described notice, channel quality instruction is calculated; C. described base station is given by described channel quality indication feedback.
According to a third aspect of the invention we, provide a kind of in the base station of cordless communication network for compensating the method for the reciprocal error of up-downgoing, wherein, comprise the following steps:
I. information displaying or the hidden informing user terminal shown of Reference Signal, wherein, described user terminal utilizes described reference signal to measure and feedback channel quality indication information;
II. utilize compensating parameter to compensate described reference signal, for carrying out descending channel information measurement, wherein, described reference signal comprises cell special reference and/or channel state information reference signals and/or demodulated reference signal;
III. the reference signal after described compensation is sent to described user terminal;
IV. obtain and preserve the channel quality information obtained according to the reference signal after described compensation that described user terminal feeds back;
Also comprise after described 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 repeated each time adopts identical compensating parameter, to obtain the assembly average of multiple channel quality information in described predetermined amount of time or described pre-determined number;
Also comprise after described step V:
VI. often take turns and adopt different compensating parameters respectively, take turns Step II described in repetition to V with the time period of described predetermined length or described pre-determined number group more, to obtain the assembly average of multiple channel quality information respectively, and the size of the assembly average of more described multiple channel quality information;
Also comprise after described step VI:
VII. by the assembly average of described multiple channel quality information, the compensating parameter corresponding with the assembly average of maximum channel quality information be used for compensate for channel.
According to a forth aspect of the invention, provide a kind of in the base station of cordless communication network for compensating the method for the reciprocal error of up-downgoing, wherein, comprise the following steps:
M. compensating parameter is utilized to compensate to sent multiple data;
N. obtain and preserve one group of response message to described multiple data through overcompensation that described user terminal feeds back within the time period of predetermined length, wherein, this group response message comprises positive acknowledgement message and/or negative acknowledgment message;
O. the ratio of positive acknowledgement message and negative acknowledgment message within the time period of described predetermined length is calculated;
Also comprise after described step O:
-with the time period of described predetermined length or with pre-determined number repeating said steps M to O, wherein, each is taken turns in the step M of repetition and adopts different compensating parameters, described predetermined amount of time or the corresponding many groups response message of described pre-determined number is taken turns with each to obtain, and the described ratio in more described many groups;
By in described many group response messages, compensating parameter that the one group response message the highest with described ratio is corresponding is used for compensate for channel.
According to a fifth aspect of the invention, provide a kind of first device being used to indicate user terminal feedback channel relevant information in the base station of cordless communication network, this first device comprises:
Notifying device, for the relevant information informing user terminal by demodulated reference signal, wherein, described user terminal will utilize described demodulated reference signal to measure and feedback channel quality indication information;
Pretreatment unit, for carrying out channel preliminary treatment to described demodulated reference signal;
Dispensing device, for sending described through the pretreated demodulated reference signal of channel to described user terminal.
According to a sixth aspect of the invention, provide a kind of in the user terminal of cordless communication network the second device for feedback channel quality information, this second device comprises:
Acquisition device, for obtaining the notice signaling of base station from the described user terminal of administration, wherein, described notice signaling is for notifying the relevant information of demodulated reference signal of described user terminal for measuring;
Calculation element, for the demodulated reference signal according to described notice, calculates channel quality instruction;
Feedback device, for giving described base station by described channel quality indication feedback.
Adopt the solution of the present invention, for the system with spatial coherence, while the performance obtained, can only need less feedback overhead, and reduce the complexity of calculating.
Accompanying drawing explanation
Read the following detailed description to non-limiting example by referring to accompanying drawing, 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 schematic diagram of the CoMP transmission based on CRS 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 represents same or analogous steps characteristic or device/module.
Embodiment
In the present invention, we are described for multipoint cooperative community.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 a specific embodiment of the present invention.First, in step slo, base station 1 is by the relevant information informing user terminal 2 of demodulated reference signal, and wherein, user terminal 2 utilizes this demodulated reference signal to measure and 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 not for the demodulated reference signal of demodulation Physical Downlink Shared Channel or the demodulated reference signal for demodulation Physical Downlink Shared Channel.When demodulated reference signal is used for demodulation Physical Downlink Shared Channel, the characteristic of channel that this demodulated reference signal experiences is identical with the characteristic of channel that information sharing channel experiences, therefore, DMRS for demodulation PDSCH channel is applicable to the channel of smooth variation, also be, when the channel of the subsequent time utilizing DMRS to predict and the current PDSCH characteristic of channel for transmitting data remain unchanged, the channel feedback information of the subsequent time that the CQI based on DMRS feeds back is accurately; And when demodulated reference signal is not for demodulation Physical Downlink Shared Channel, because this DMRS does not need to bind together with PDSCH, therefore, this DMRS has the freedom of height, can according to scheduling strategy, neatly the channel preliminary treatment that subsequent time needs to carry out is carried out to this DMRS, such as, DMRS can without channel precoding, and due to the density of the density ratio CSI-RS of DMRS higher, therefore, can as the CSI-RS strengthened; In addition, DMRS can adopt the PMI different from the PMI given tacit consent to; And based on the CoMP cell associating transmitted next time and based on the user's pairing transmitted next time, thus predict the characteristic of channel next time transmitted of subsequent time exactly.
In addition, (UE specific) that base station 1 can adopt user terminal special descending control instruction (Downlink Control Indicator, DCI) signaling instruction is used for user terminal 1 DMRS that carries out CQI measurement and is positioned at which or which resource particle (ResourceElement, RE) information, thus user terminal 1 can according to the DMRS of this instruction, carry out CQI measurement, wherein, the information of this DMRS comprises the position of this DMRS, such as, this DMRS is arranged on which RE of Resource Block, also be, corresponding to which time-domain symbol and subcarrier in frequency domain, index is carried out respectively by the sequence number of time domain and frequency domain.
Considering and adopt the information of user terminal special signaling instruction DMRS to cause larger signaling consumption, alternatively, the indication signaling of cell-specific also can being adopted to be used to indicate DMRS for carrying out CQI measurement.Such as, base station 1 can configure specific subframe as the DMRS measured for CQI, and also, base station 1 retains some DMRS port and measures for CQI.High-level signaling can be passed through, such as radio resource control signaling (Radio ResourceControl, RRC), or implicit expression, such as in conjunction with the mode of the sequence number of single frequency network (Single FrequencyNetwork, SFN), the DMRS measured for CQI that definition is reserved, then, the DMRS that user terminal is triggered indicated by these signalings carries out the measurement of CQI.
Then, in step s 11,1 pair, base station demodulated reference signal carries out channel preliminary treatment.Preferably, this be used for user terminal 2 carry out the DMRS of CQI measurement process channel preliminary treatment and channel when next time transmitting the preliminary treatment of process identical.
Then, in step s 13, base station 1 sends this through the pretreated demodulated reference signal of channel to user terminal 2.
Then, in step S14, user terminal 2, according to the demodulated reference signal of this notice, calculates channel quality instruction.
Then, in step S15, user terminal 2 again by calculate channel quality indication feedback to base station 1.
In the above-described embodiment, in step slo, it is consider user terminal 2 after receiving the signalling that base station 1 first sends to user terminal 2 signaling comprising the DMRS that instruction is measured for CQI, need to carry out demodulation, thus cause certain delay, in order to user terminal 2 can in time or these for CQI measure DMRS, need in advance these indication signalings are sent to user terminal 2.Certainly, those skilled in the art are appreciated that it also can is parallel between above-mentioned steps S10 and step S11 completely, or before step S11 is sent in step S10.
Fig. 2 shows the sequential chart according to above-mentioned execution mode of the present invention.Compared with traditional CQI, the report adopting untapped DMRS to carry out CQI extends the interval between the transmission of " prediction " and the transmission of " reality ", as shown in Figure 2.It will be understood by those skilled in the art that the interval time between both is shorter, channel estimating information is more accurate.
In order to reduce the interval of this prolongation, need to select the suitable downlink transfer with the shortest delay and up report mechanism.For TDD system, can adopt based on acyclic detection reference signal (Sounding Reference Signal, SRS), thus not need actual downlink transfer.For FDD system, adopt descending CRS or DMRS and based on up long-term precoding matrix indicators, up report can be removed, and shorten processing delay.
In the embodiment of a change, the mismatch of the radio frequency between the antenna considering each base station of multiple cell, also be, the radio circuit of transmitting set and the radio circuit of wireless receiver have very large difference, therefore, the error of reciprocity between the uplink and downlink causing channel, and traditional self calibration can not solve the radio frequency mismatch problems between multiple cell completely, therefore, the CQI based on DMRS can be adopted to calibrate radio-frequency (RF) match error between multiple antennas.Below, be described for 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 cooperation system more than two base stations completely.
With
with
be illustrated respectively in 1 × M vector, be illustrated respectively in the channel parameter of the uplink and downlink between the M transmit antennas of i-th community and the single antenna of CoMP user terminal.Therefore, the radio frequency mismatch between antenna 1 and antenna 2 can be expressed as:
Wherein, σ represents energy, is also the side-play amount of amplitude, and
represent the side-play amount of phase place, σ and
be the compensating parameter acted on antenna
represent respectively
with
in i-th element, mean represents the mean value getting repetitive measurement and result of calculation.
Such as, base station 1 and base station 3 are worked in coordination with as user terminal 2 is served, then after 1 pair, step S11 base station DMRS carries out channel preliminary treatment, and in step S13, base station 1 also comprises following set-up procedure S12 after sending this reference signal:
CoMP cooperation cell is according to maximum likelihood class (Maximum Likelihood-alike, ML alike) method adjustment base station 3 and the error between the relative amplitude between base station 1 and phase place.Specifically, the step S12 of this adjustment can be divided into:
Sub-step S120: if the possible relative phase offset scope between the antenna of base station 1 and base station 3 exists
between, then hunting zone exists
wherein, g represents the stepping by the determined search of the precision of calibrating, such as, if wish the control errors of final calibration to exist
scope in, then g can value be
this g represents the increment relative to a upper cycle phase in each circulation.Further, and to the adjustment of phase place similarly, the adjusting range of amplitude and stepping can be defined as
wherein, 0.1dB is the stepping of amplitude adjustment, hereinafter, 0.1dB is expressed as s.Such as, time initial, base station 1 determine by
value is
as first compensating parameter, the antenna of base station 1 and base station 3 is compensated.Namely the calibration process to antenna occurred hereinafter also refers to and compensates antenna.
Sub-step S121: then, base station 1 and base station 3 are with high specific (Maximum RatioTransmission, MRT) send mode adopts following formula to compensate respective transmitting antenna respectively, also be, in step S12 DMRS to be sent after the channel preliminary treatment of base band, following formula is adopted to compensate DMRS to be sent further at radio frequency:
For the antenna of base station 1, compensation formula is:
For the antenna of base station 3, compensation formula is
Sub-step S122: base station 1 and base station 3 send the DMRS after overcompensation to user terminal 2.
Sub-step S123: base station 1 obtains and preserves the CQI fed back according to the DMRS after this compensation that user terminal 2 feeds back.
Sub-step S124: base station 1 with identical compensating parameter σ and
also namely, still adopt
as compensating parameter, repeat above-mentioned sub-step S121 to S123, until meet predetermined condition.This predetermined condition such as comprises:
Base station 1 is repeated to send and is passed through
the DMRS of parametric compensation reaches the time period of predetermined length, or the number of times repeating to send reaches pre-determined number, and then, base station 1, according to the CQI of each feedback, calculates the assembly average of the CQI of these feedbacks, thus completes the compensation of the antenna that takes turns.
Then, the compensation of the antenna of next round is carried out in base station 1.Such as, base station 1 according to the value of g and s, to σ and
adjust.Will
value is
also be
base station 1 basis again
repeat above-mentioned sub-step S121 again to sub-step S124, after iteron step S121 and sub-step S124 meets above-mentioned predetermined condition, also be, the time span repeated or the number of times of repetition meet predetermined time length or predetermined number of repetition after, then calculate the assembly average that this takes turns the CQI after compensation.Then, then progressively increase σ and
value, and repeat above-mentioned sub-step S121 to sub-step S124, until traveled through
with
in all combinations, thus obtain the assembly average that each combines corresponding multiple channel quality informations respectively, and the size of the assembly average of more the plurality of channel quality information.
Then, compensating parameter in the assembly average of the plurality of channel quality information, corresponding with the assembly average of maximum channel quality information is chosen for compensate for channel in base station 1.
In one embodiment, based on the simulation parameter set by table one, table two shows corresponding to each compensating parameter pair
the simulation result of 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 |
| User terminal number | 570 |
| Community number | 19 |
| Descending control DL CE | Desirable |
| The Resource Block be scheduled | 10 Resource Block (RB) |
| Precoding granularity | 1 Resource Block (RB) |
| UE rate travel | 3km/h |
| Simulation time | 216 Transmission Time Intervals (TTI) |
Table two
Can find out easily from table two, the calibration based on the CQI of DMRS is very accurately.In addition, if preferred user terminal is carried out assisted calibration, such as by selection, according to certain rule, the user terminal that such as optional m igration speed is slow, or select the user terminal not carrying out cell merge, or the user terminal being in the centre position of the multiple base stations in distance CoMP bunch of cell edge is calibrated, or adopt longer timing statistics, then the performance of calibrating will further improve.
In above-mentioned emulation, we suppose that the calibration in community completes.For a base station, there are 4 antennas, when community internal calibration completes, mean that 4 antennas of a base station are calibrated.
Certainly, the present invention is applicable to the unregulated situation of antenna in community too.If when the antenna in community is not calibrated, first fix an antenna, other antennas during alternately selects CoMP bunch, adjust according to formula (1) and formula (2).
In each above-mentioned embodiment, describe the scheme compensated according to the CQI based on DMRS.Be appreciated that except the CQI based on DMRS, the CQI based on CRS/CSI-RS also can be adopted to carry out the calibration of the antenna of many base stations.
Fig. 3 shows the schematic diagram of the antenna according to this embodiment.Wherein, there is shown 8 transmit antennas, 8 reception antennas.The scheme that antenna compensates and above-mentioned step S12 all fours, therefore, do not repeat them here.
Calibration process is for the impact of CRS CoMP transmission
-for the impact of PDSCH:
Cell Edge User is not affected.For Cell Center User, as described in Figure 3, because originally served the antenna of this community when carrying out CoMP cooperation, need the user terminal of serving neighbor cell, therefore, usually for the CRS position of minizone, the interference of average 0dB can be brought, this may reduce the detection perform of PDSCH, but can be compensated by the selection of modulation coding mode.
-for the impact of PDCCH:
With PDSCH similarly, usually can bring the interference of average 0dB to PDCCH for the user terminal of center of housing estate, consider the robustness (non-time shift characteristic) of PDCCH channel, these interference are acceptables.In addition, if necessary, frequency division multiplexing (Frequency Division Multiplexing can be passed through, FDM, comprise in Rel.10 across carrier dispatching) and time division multiplexing (Time Division Multiplexing, TDM, adopts different OFDM symbol for different communities) etc. mode eliminate interference.
It should be noted that these impacts only occur over just calibration phase, it only takies the sub-fraction of whole call duration time.
Because CRS is with through operations such as predefined scramblers, the corresponding information of indicating user terminal CRS, so that user terminal is measured, and does not need signaling to indicate, is therefore called the advice method of implicit expression.
Certainly, it will be understood by those skilled in the art that above-mentioned feedback of how to carry out CQI realizes relevant to concrete UE, those skilled in the art completely can content disclosed according to the present invention, utilize more than a kind of reference signal to calculate CQI, as long as the definition of CQI meets specification.
In each above-mentioned embodiment, the calibration that we all utilize CQI information to carry out between the antenna of many base stations.Except CQI information, we can also utilize thick feedback information, such as ACK or NACK message, the calibration between the antenna carrying out many base stations.
Such as, first, base station 1 utilizes compensating parameter to compensate adopting multiple data that CoMP mode and base station 3 are cooperated, to be sent, and compensation formula is identical with formula (2) with formula (1).
Then, base station 1 obtain and preserve that user terminal 2 feeds back within the time period of predetermined length to this response message through multiple data of overcompensation, wherein, this group response message comprises positive acknowledgement message and/or negative acknowledgment message.
Then, base station 1 calculates the ratio of positive acknowledgement message and negative acknowledgment message within the time period of this predetermined length.
Then, base station 1 selects another to compensating parameter, and this predetermined length time period or continue to send through this another multiple data of compensating compensating parameter with pre-determined number, with obtain with this another to group response message of corresponding to compensating parameter, and calculate the ratio with this to the corresponding positive acknowledgement message of compensating parameter and negative acknowledgment message.Different compensating parameters pair is selected in base station 1, and repeats above-mentioned step, until base station 1 has traveled through the right combination of all possible compensating parameter.
Then, many groups positive acknowledgement message of acquisition and the ratio of negative acknowledgment message are compared in base station 1, and using the compensating parameter of the compensating parameter corresponding to the highest for wherein ratio a group as transmission channel.
Above from the angle of systems approach, multiple embodiment of the present invention is described.Below, by the angle from device, to 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, 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 acquisition device 200, calculation element 201 and feedback device 202.
First notifying device 100 is for the relevant information informing user terminal by demodulated reference signal, and wherein, described user terminal will utilize described demodulated reference signal to measure and feedback channel quality indication information.
Then, acquisition device 200 is for obtaining the notice signaling of base station from the described user terminal of administration, and wherein, described notice signaling is for notifying the relevant information of demodulated reference signal of described user terminal for measuring.
Then, pretreatment unit 101 is for carrying out channel preliminary treatment to described demodulated reference signal.
Then, dispensing device 102 is for sending described through the pretreated demodulated reference signal of channel to described user terminal.
Then, calculation element 201, for the demodulated reference signal according to described notice, calculates channel quality instruction;
Finally, feedback device 202 is for giving described base station by described channel quality indication feedback.
It should be noted that, above-described embodiment is only exemplary, but not limitation of the present invention.Any technical scheme not deviating from spirit of the present invention all should fall within protection scope of the present invention, and this comprises the different technologies feature that use occurs in different embodiments, and dispatching method can combine, to obtain beneficial effect.In addition, any Reference numeral in claim should be considered as the claim involved by restriction; " comprise " word and do not get rid of device unlisted in other claim or specification or step; " one " before device does not get rid of the existence of multiple such device; In the equipment comprising multiple device, the one or more function in the plurality of device can be realized by same hardware or software module; The word such as " first ", " second ", " the 3rd " is only used for representing title, and does not represent any specific order.
Claims (13)
1. in the base station of cordless communication network, be used to indicate a method for user terminal feedback channel relevant information, the method comprises the following steps:
A. by the relevant information informing user terminal of demodulated reference signal, wherein, described user terminal will only utilize described demodulated reference signal to measure and feedback channel quality indication information;
B. channel preliminary treatment is carried out to described demodulated reference signal;
D. send described through the pretreated demodulated reference signal of channel to described user terminal.
2. method according to claim 1, wherein, also comprises after described step B, before described step D:
C. compensating parameter is utilized to compensate through pretreated demodulated reference signal described, for carrying out descending channel information measurement;
Described step D also comprises: send the described demodulated reference signal through overcompensation to described user terminal;
Also comprise after described step D:
E. obtain and preserve the channel quality instruction obtained according to the demodulated reference signal of described compensation that described user terminal feeds back;
F. with the time period of predetermined length or with pre-determined number repeating said steps C to E, wherein, the step C repeated each time adopts identical compensating parameter, to obtain an assembly average of channel quality information in described predetermined amount of time or described pre-determined number;
Also comprise after described step F:
G. often take turns and adopt different compensating parameters respectively, take turns repeating said steps C to F with the time period of described predetermined length or described pre-determined number group more, to obtain the assembly average of multiple channel quality information respectively, and the size of the assembly average of more described multiple channel quality information;
Also comprise after described step G:
H. by the assembly average of described multiple channel quality information, the compensating parameter corresponding with the assembly average of maximum channel quality information be used for compensate for channel.
3. method according to claim 1 and 2, wherein, also comprises before described steps A:
-obtain the pre-coding matrix instruction of feeding back from described user terminal;
-indicate according to described pre-coding matrix, determine scheduling strategy, wherein, described scheduling strategy comprises described channel pretreatment mode.
4. method according to claim 1 and 2, wherein, also comprises before described steps A:
-obtain aperiodicity uplink detection signal from described user terminal;
-according to described aperiodicity uplink detection signal, determine scheduling strategy, wherein, described scheduling strategy comprises described channel pretreatment mode.
5. method according to claim 1 and 2, wherein, described steps A also comprises:
-explicitly notifies the reference signal information of cell-specific of described user terminal for calculating channel quality information and monitoring.
6. method according to claim 1 and 2, wherein, described demodulated reference signal comprises not for the demodulated reference signal of demodulation Physical Downlink Shared Channel or the demodulated reference signal for demodulation Physical Downlink Shared Channel.
7. method according to claim 1 and 2, wherein, described channel preliminary treatment comprises base station multipoint cooperative and/or precoding mode and/or user terminal and matches.
8. in the user terminal of cordless communication network for a method for feedback channel quality information, the method comprises the following steps:
A. obtain the notice signaling of base station from the described user terminal of administration, wherein, described notice signaling is for notifying the relevant information of demodulated reference signal of described user terminal for measuring;
B. only according to the demodulated reference signal of described notice, channel quality instruction is calculated;
C. described base station is given by described channel quality indication feedback.
9. method according to claim 8, wherein, also comprises before described step a:
-to the long-term pre-coding matrix indication information of described base station feedback.
10. method according to claim 8, wherein, also comprises before described step a:
-receiving detectable signal request message from described base station, described request message sends aperiodic detectable signal for asking described user terminal to described base station;
-send aperiodic detectable signal to described base station.
11. 1 kinds of first devices being used to indicate user terminal feedback channel relevant information in the base station of cordless communication network, this first device comprises:
Notifying device, for the relevant information informing user terminal by demodulated reference signal, wherein, described user terminal will only utilize described demodulated reference signal to measure and feedback channel quality indication information;
Pretreatment unit, for carrying out channel preliminary treatment to described demodulated reference signal;
Dispensing device, for sending described through the pretreated demodulated reference signal of channel to described user terminal.
12. first devices according to claim 11, also comprise:
Compensation arrangement, for utilizing compensating parameter to compensate through pretreated demodulated reference signal described, for carrying out descending channel information measurement;
Described dispensing device also for, send the described demodulated reference signal through overcompensation to described user terminal;
Described first device also comprises:
Save set, for obtaining and preserving the channel quality instruction obtained according to the demodulated reference signal of described compensation that described user terminal feeds back;
Wherein, described compensation arrangement is repeated with the time period of predetermined length or with pre-determined number, the function that described dispensing device and described save set perform, wherein, the compensation arrangement repeated each time adopts identical compensating parameter, to obtain an assembly average of channel quality information in described predetermined amount of time or described pre-determined number;
Often take turns and adopt different compensating parameters respectively, take turns compensation arrangement described in repetition with the time period of described predetermined length or described pre-determined number group more, the function that described dispensing device and described save set perform and above-mentioned repetition step, to obtain the assembly average of multiple channel quality information respectively, and the size of the assembly average of more described multiple channel quality information;
By in the assembly average of described multiple channel quality information, the compensating parameter corresponding with the assembly average of maximum channel quality information be used for compensate for channel.
13. 1 kinds in the user terminal of cordless communication network for the second device of feedback channel quality information, this second device comprises:
Acquisition device, for obtaining the notice signaling of base station from the described user terminal of administration, wherein, described notice signaling is for notifying the relevant information of demodulated reference signal of described user terminal for measuring;
Calculation element, for only according to the demodulated reference signal of described notice, calculates channel quality instruction;
Feedback device, for giving described base station by described channel quality indication feedback.
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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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