CN103812619B - Realize the method and device of channel measurement - Google Patents
Realize the method and device of channel measurement Download PDFInfo
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- CN103812619B CN103812619B CN201410040140.1A CN201410040140A CN103812619B CN 103812619 B CN103812619 B CN 103812619B CN 201410040140 A CN201410040140 A CN 201410040140A CN 103812619 B CN103812619 B CN 103812619B
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Abstract
The invention discloses the method and device for realizing channel measurement, wherein, methods described includes：It is that UE determines to need the antenna port subset of measurement according to the current status information of user equipment (UE)；Notify that UE carries out channel measurement and feeding back channel state information for the antenna port subset for needing measurement.By the present invention, the status information of UE can only measure the reference signal of some antennas port in the case where certain condition is met, and for this some antennas port feeding back channel state information, so as to reduce feedback overheads of the UE to channel condition information.
Description
Technical field
The present invention relates to communication technical field, the method and device of channel measurement is more particularly to realized.
Background technology
OFDM（Orthogonal Frequency Division Multiplexing, OFDM）It is a kind of special
Different Multicarrier Transmission Technology, a transmission bandwidth wider is separated into mutually orthogonal multiple subcarriers for passing parallel by it
Transmission of data.
In an ofdm system, in order to carry out wireless resource scheduling, base station needs to obtain the downlink channel condition information of UE.It is logical
Often, using UE（User Equipment, user equipment）The method that measurement is reported obtains the information.The method master that the measurement is reported
Including：Base station sends reference signal；UE obtains downlink channel condition information using the reference signal measurement for receiving；Then,
The downlink channel condition information that UE will be measured feeds back to base station.The downlink channel condition that base station is fed back according to each UE for receiving
Information carries out wireless resource scheduling, i.e. to determine how to the limited running time-frequency resource of each UE distribution, to maximize Radio Resource profit
With rate.
But, the present inventor realize it is of the invention during find, in MIMO（Multiple Input Multiple
Output, multiple-input, multiple-output）In system, base station end has multiple antenna ports, and each antenna port has reference signal to send, and UE is needed
The channel condition information of all antenna ports is measured, and to base station feedback, therefore, measurement and feedback overhead are larger.
The content of the invention
The invention provides the method and device for realizing channel measurement, UE can be reduced the feedback of channel condition information is opened
Pin.
The invention provides following scheme：
A kind of method for realizing channel measurement, including：
It is that UE determines to need the antenna port subset of measurement according to the current status information of user equipment (UE), wherein, it is described
UE current status information includes the currently used transmission modes of UE；
It is the UE choosings from advance ready-portioned each antenna port subset according to the currently used transmission modes of UE
Select the antenna port subset for needing measurement；
Notify that UE carries out channel measurement and feeding back channel state information for the antenna port subset for needing measurement.
A kind of device for realizing channel measurement, including：
Determining unit, for according to the current status information of user equipment (UE), being that UE determines to need the antenna port of measurement
Subset, wherein, the UE current status information includes the currently used transmission modes of UE；
The determining unit includes：
Selection subelement, for according to UE currently used transmission mode, from advance ready-portioned each antenna end openning
Concentrate, be the antenna port subset of the UE selections needs measurement；
Notification unit, for notifying that UE carries out channel measurement and feedback letter for the antenna port subset for needing measurement
Channel state information.
A kind of user equipment, including：
Notification receiving unit, the notice for receiving base station transmission, knows the antenna port subset for needing measurement；The need
The antenna port subset to be measured is determined by the base station according to the current status information of the user equipment；
Measurement feedback unit, for carrying out channel measurement and feedback channel for the antenna port subset for needing measurement
Status information.
A kind of method for realizing channel measurement, including：
According to itself the current status information known from base station, from advance ready-portioned each antenna port subset,
Selection needs the antenna port subset of measurement；
Channel measurement and feeding back channel state information are carried out for the antenna port subset for needing measurement.
A kind of device for realizing channel measurement, including：
Select unit, for itself current status information that basis is known from base station, from advance ready-portioned each day
Line end openning is concentrated, and selection needs the antenna port subset of measurement；
Feedback unit, for carrying out channel measurement and fed-back channel status for the antenna port subset for needing measurement
Information.
According to the specific embodiment that the present invention is provided, the invention discloses following technique effect：
The embodiment of the present invention can be the antenna port subset of UE selection needs measurements according to UE current status information,
And notify that UE carries out channel measurement and feeding back channel state information for the antenna port subset for needing measurement.By this hair
It is bright, UE can be made only to measure the reference signal of some antennas port in the status information of UE in the case where certain condition is met,
And for this some antennas port feeding back channel state information, therefore, reduce feedback overheads of the UE to channel condition information.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing for needing to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the flow chart of the method that the embodiment of the present invention one is provided；
Fig. 2 is single cell distributing antenna system schematic diagram provided in an embodiment of the present invention；
Fig. 3 is the flow chart of the method that the embodiment of the present invention two is provided；
Fig. 4 is the schematic diagram of device provided in an embodiment of the present invention；
Fig. 5 is the schematic diagram of another device provided in an embodiment of the present invention；
Fig. 6 is the schematic diagram of user equipment provided in an embodiment of the present invention；
Fig. 7 is the schematic diagram of another device provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Embodiment one, referring to Fig. 1, the channel measuring method method that the embodiment of the present invention one is provided is comprised the following steps：
S101：It is the antenna port subset of UE selection needs measurements according to the current status information of user equipment (UE)；
S102：Notify that UE carries out channel measurement and fed-back channel status letter for the antenna port subset for needing measurement
Breath.
Wherein, the UE current status information can include the geographical position of the translational speed of UE, UE and each antenna port
Put the path loss relation information of relation, UE and each antenna port, transmission mode that UE is currently at etc..When being selected,
One or more antenna ports can be selected from all antenna ports of base station according to above-mentioned status information, constituting needs measurement
Antenna port subset, and notify UE only measure and feed back it is described need measurement antenna port subset and UE between channel shape
State information.For example, the information such as signal intensity reported from UE when base station knows the geographical position relation of UE and each antenna port, so
Selecting one or more closest with UE antenna ports compositions afterwards needs the antenna port subset of measurement, and notify to
After UE, UE receive notice, the antenna port subset of needs measurement, other antenna ends outside the antenna port subset are only measured
Mouth will not be measured, and the information feedback of the above-mentioned respective antenna port subset of the correspondence that then UE obtains measurement is to base
Stand.
In actual applications, for the ease of selection, the set that in advance can be constituted each antenna port of base station end is drawn
It is divided into multiple antenna port subsets, then when the antenna port subset of measurement is needed for UE selections, according to the current states of UE
Information, is the UE selections antenna port subset from these ready-portioned each antenna port subsets.
In this manner, base station can prenotice all of possible aggregate manners of UE, and to various collection cooperation marks
Know（For example it is numbered）.When needing to obtain channel condition information, according to UE state in which by certain or multiple antenna end
The identification notification of openning collection carries out channel condition information measurement and feedback to UE, the set that UE is based on respective identification.
For example, base station A is configured with N number of antenna port, N number of antenna port is divided into m antenna port subclass, respectively
It is N0, N1, N2..., Nm, wherein, can mutually be overlapped between each antenna port subset, for example, N0In can include antenna end
Mouth 1 and antenna port 2；N1In can include antenna port 2 and antenna port 3, wherein, antenna port 2 is both in N0In, also in N1
In, when specifically dividing, can determine according to actual conditions, do not limit here.Base station A can be according to the state information notification of UE
UE measures the antenna port subset of one or more or the whole in m antenna port subset；Then, above-mentioned UE is measurement
Information feedback give base station A.Specific embodiment is described in detail below.
Implementation method one, in the specific embodiment one, the set that can be constituted all antenna ports of base station is drawn
It is divided into the antenna port subset suitable for different UE translational speeds.I.e., it is possible to the temporal correlation according to channel divides antenna end
The set of mouth, for example, the set of all antenna ports can be divided into two antenna port subsets, one of antenna port
Subset is applied to the UE of high speed, and reference signal is sent with frequency higher, and another antenna port subset is applied to the UE of low speed,
Reference signal is sent with relatively low frequency.
When UE reporting status information of channel is needed, can notify that high speed UE only measures the antenna port suitable for high speed UE
Subset, and feeding back channel state information；Notify low speed UE measurements suitable for the antenna port subset of low speed UE, and feedback channel shape
State information.So, can both ensure that the UE of low speed does not result in the wasting of resources, can ensure that the UE of high speed can be with sufficiently high again
Frequency in time to base station reflect channel status change, meanwhile, the UE of the either UE of low speed, or high speed need not be surveyed
All of antenna port is measured, therefore, it can reduce feedback overhead, the performance of system is improved on the whole.Certainly, for low speed
For UE, it is also possible to while measuring the antenna port subset of high speed and the antenna port subset of low speed.
For example, all antenna ports of base station can be divided into antenna port subset A and antenna port subset B in advance,
Antenna port subset A sends cycle is short（Frequency is high）, it is long that antenna port subset B sends the cycle（Such as antenna port subset A sends
Cycle is 5ms, and antenna port subset B sends the cycle for 10ms）, and UE1 and UE2 belong to the base station, wherein, UE1 is height
Fast user, UE2 is low speed user.Then base station can notify that UE1 measures antenna port subset A, notify UE2 measurement antenna end opennings
Collection B, or can notify that UE2 measures antenna port subset A and antenna port subset B simultaneously.
Because in actual applications, the translational speed of UE may be different, for example, some users are probably in certain fixed position
Place, some users may walked about, and user also may be rided on certain vehicles with the movement of comparatively faster speed
Etc..The translational speed of UE is corresponding with the temporal correlation of channel, for example, UE is when low speed is moved, the time correlation of channel
Property it is stronger, channel condition information changes with time not substantially, therefore, UE can be believed with relatively low frequency feedback channel status
Breath；Conversely, UE is in high-speed mobile, channel is weaker temporal correlation, and channel condition information changes with time may be to non-
Chang Mingxian, therefore, in order to more accurately obtain real-time channel condition information, it may be necessary to which UE is with frequency measurement higher and instead
Feedback channel condition information.Wherein, the frequency that the frequency of UE measurements and feeding back channel state information sends reference signal with base station has
Close, i.e. when base station sends reference signal with high-frequency, the frequency of UE measurements and feedback just can be higher, when base station is with low frequency
When rate sends reference signal, UE can only be using relatively low measurement and the frequency of feedback.
In the prior art, all antenna ports of base station all send reference signal with identical frequency.And in fact, same
Each UE under one base station might have different states in synchronization, always have translational speed UE faster, while
There is the relatively slow UE not moved even of translational speed.Reference signal is all sent with frequency higher if all of antenna port, then
For the relatively slow UE not moved even of translational speed, because its channel state variations is slower, it is not necessary to which frequency higher is entered
Row channel status is measured and fed back, therefore, the waste of resource will necessarily be caused.And if all of antenna port all with relatively low
Frequency sends reference signal, and for translational speed faster UE, base station may again obtained sufficiently exact
Channel condition information.
And the method that the implementation method one offer is provided, each antenna port of base station can be sent with different frequencies joins
Signal is examined, if the translational speed of UE is very fast, can notify that the ginseng that UE measures transmission frequency antenna port subset higher is believed
Number；Otherwise, the ginseng signal of the relatively low antenna port subset of UE measurements transmission frequency is notified.Therefore, the implementation method one also has
Advantages below：Both can ensure that the fast UE of translational speed can feed back sufficiently exact channel condition information, can ensure right again
The waste of resource is not resulted in the low UE of translational speed.
It should be noted that in actual applications, the translational speed of UE can not only include high speed and two kinds of feelings of low speed
Condition, for example, several different intervals can be divided into UE translational speeds, is also divided into multiple antenna end opennings by antenna port accordingly
Collection, during specially UE selection antenna port subsets, it can be determined which interval is the translational speed of user fall in, and selects corresponding
Antenna port subset.
It is further to note that base station can obtain the translational speed information of UE, tool by the uplink channel information of UE
The method prior art of body has been able to realize, repeats no more here.
Implementation method two, in the specific embodiment two, can be according to the geographical position of antenna, by all days of base station
The set of line end mouthful composition is divided into multiple antenna port subsets.For example, can be closer by mutual distance on geographical position
Antenna port constitutes an antenna port subset, and the closer antenna port of mutual distance can constitute it on other geographical position
His antenna port subset.When UE feeding back channel state informations are needed, can be selected according to UE current geographical location information
With the antenna port subset that the distance of the UE meets prerequisite；And/or, can be according between current UE and each antenna port subset
Information on path loss（The information on path loss can be released by the geographical location information of UE, it is also possible to by the uplink information of UE
Obtain）, the path loss between selection and UE meets the antenna port subset of prerequisite.
As a example by single cell distributing antenna system shown in figure 2 below：Wherein geographically it is distributed in the antenna of diverse location
Port subset N1 and antenna port subset N2 are under the jurisdiction of a base station A, and accordingly, base station A is used for the reference of channel measurement
Signal is also divided into two antenna port subsets A and B（Antenna port is one-to-one with reference signal）, they are respectively by day
Line port subset N1 and N2 launch.PLij（i=1,2;j=1,2,3）It is the path loss of antenna port subset i to UEj.Consider
To the difference of the path loss of UE, UE can use different antenna port subsets to each antenna port subset.For example, one can
The antenna port of energy distributes measurement scheme：The corresponding reference signals of UE1 measurement antenna port subsets N1；UE3 measures day
The corresponding reference signals of line port subset N2；UE2 measures the corresponding reference signal of antenna port subset N1 and N2 simultaneously.
In actual applications, multiple antenna ports of base station are probably to be dispersed in multiple positions in a distributed manner, the current institutes of UE
The position at place also determine the quality of channel condition information with the relativeness of antenna port present position.
For example, if UE is closer apart from certain antenna port, the path loss that UE receives signal may be smaller, UE
The signal for receiving the antenna port may be relatively strong, therefore, channel status may also can be relatively good；, whereas if UE is apart from certain
Antenna port is very remote, then UE receive the path loss of signal may be than larger, the signal that UE receives the antenna port can
Can be very weak, therefore, channel status may also can be poor.Now, the channel status of the very remote antenna port of the distance
Information is probably very small for the effect that base station carries out wireless resource scheduling, the business for finally also allowing the antenna port to carry
Information also can be considerably less, does not carry the business information of the UE using the antenna port even.Therefore, for all antenna ports
All measure, and in the case of feeding back channel state information, the channel shape that this part is carried out for the very remote antenna port
State measures and feeds back the waste for having resulted in resource.
And the method for utilizing the implementation method two to provide, believe for the reference apart from UE very remote antenna port subset
Number, can notify that UE need not be measured, corresponding channel condition information need not also feed back, therefore, reduce measurement and feed back
Expense.
It should be noted that base station can obtain the geographical location information of UE by the uplink channel information of UE, specifically
Method prior art has been able to realize, repeats no more here.
Implementation method three, in actual applications, base station may be that UE selects different biographies according to status information of UE etc.
Defeated pattern, to ensure that UE obtains optimal service quality, it is ensured that the optimum performance of system.Wherein, transmission mode can include
CoMP（Coordinated Multi-point Transmission, cooperative multipoint transmission）Pattern, JP（Joint
Processing, is jointly processed by）Pattern, CBF（Coordinated beam forming, cooperate with Wave beam forming）Pattern, CBS
（Coordinated beam switching, collaboration wave beam conversion）Pattern, single cell serves pattern, multi-user mode etc..
Preferably in three, it is also possible to by the set of all antenna ports of base station, it is divided into suitable for not simultaneous interpretation
The antenna port subset of defeated pattern, for example, can using some antenna ports as the antenna port subset suitable for CoMP patterns,
Other antenna ports are used as antenna port antenna port subset suitable for single cell serves pattern etc..So, needs are worked as
During UE feeding back channel state informations, can select to be applied to the transmission mode of the UE according to UE currently used transmission mode
Antenna port subset, then notifies the UE for the antenna port subset suitable for the UE transmission modes, to base station feedback
Channel condition information.For example, UE1 is in CoMP patterns, then base station notifies that UE1 only measures the sets of reference signals of CoMP patterns,
And feed back corresponding channel condition information.
In actual applications, under different transmission modes, the transmission to reference signal may need to carry out some spies
Different configuration.For example, when there is UE to be in CoMP patterns, it is necessary to lifting（Power boosting）The transmitting work(of reference signal
Rate, under prior art manner, can only just allow the equal lifting of transmission power of all antenna ports.But, it is under the jurisdiction of the base station
Other UE are probably to be in other patterns such as single cell serves, in these modes, it is not necessary to carry out transmission power high, because
This, in this case, the high emission power of reference signal is clearly one kind for these are not at the UE of CoMP patterns
Waste.
And preferably, due in advance being divided antenna port, therefore, it can only in three methods for providing
The reference signal that antenna port subset suitable for CoMP patterns sends is configured according to the feature of CoMP patterns, it is other
Antenna port subset can not carry out specially treated.So, another advantage of the implementation method three is the presence of CoMP moulds
In the case of formula, can avoid for the reference signal of whole antenna ports all carrying out special configuration, save resource.
For example, for the reference signal of the antenna port subset for CoMP patterns, in CoMP cell collection, adjacent cell exists
The RE of the above-mentioned reference signal of correspondence（Resource element, Resource Unit）On data do not send；It is not used in for other
The reference signal of the antenna port subset of CoMP patterns, in CoMP cell collection, RE of the adjacent cell in the above-mentioned reference signal of correspondence
On data still send, i.e., do not carry out particular arrangement.
Or, power lifting, rather than CoMP can be carried out to the reference signal of the antenna port subset for CoMP patterns
The reference signal of the antenna port subset of pattern does not carry out power lifting.
And for example, for the reference signal of the antenna port subset for CoMP patterns, in CoMP cell collection, each cell pair
Above-mentioned reference signal configuration is answered for code division is orthogonal or frequency division is orthogonal；And for the antenna port subset of other non-CoMP patterns
Reference signal, in CoMP cell collection, the above-mentioned reference signal of each cell correspondence can code division be orthogonal or frequency division without being configured to
It is orthogonal.
It should be noted that can be after antenna port subset have been divided according to transmission mode, just only to being applied to
The reference signal that the antenna port subset of CoMP patterns sends is configured according to the feature of CoMP patterns；Divide and configuration terminates
Afterwards, each antenna port subset will send reference signal according to the mode for having configured, and will not be influenceed by UE states.
It is further to note that being likely to be in an initial condition due to UE under the transmission mode of certain acquiescence, base station
The channel condition information fed back according to UE is needed to decide whether the transmission mode of change UE.Therefore, preferably in three,
UE is probably initially to be fed back the channel condition information of all antenna ports, when base station is believed according to the channel status of UE
Cease for UE have selected certain new transmission mode when, reinform UE only for the antenna port suitable for the transmission mode, feedback
Channel condition information.Certainly, after a kind of transmission mode is selected for UE, it is also possible to further according to new status information be UE
The other transmission modes of selection, at this time it is also possible to the corresponding antenna port subset of reselection, and notify UE to the antenna end openning
Collection is measured and fed back.
It is of course also possible to above-mentioned various specific embodiments are combined, according to various partitioning standards to the day of base station
Line end mouthful is divided.When antenna port subset is selected for UE, can be chosen any one kind of them from the status information of the UE for getting,
Selected in each antenna port subset under corresponding dividing mode.
It is the UE from advance ready-portioned each antenna port subset in the foregoing status information current according to UE
During selection antenna port subset, the possible only one of which of antenna port subset measured the need for choosing, it is also possible to multiple.
When the antenna port subset for needing to measure is one, UE can be based on the ginseng of the antenna port subset for notifying
Examining signal carries out channel measurement, obtain to should antenna port subset channel condition information.Need what is measured when described
When antenna port subset is for multiple, the channel condition information that UE can feed back can not only include the letter of each antenna port subset
Channel state information, in order to more accurately reflect the status information of channel, can also include that the channel status between each subset is mutual
Relevant information.Due to the combination that cross-correlation information is related to might have it is various.But, UE can not arbitrarily carry out cross-correlation
The feedback of information, since it is desired that make base station be able to know that UE feedback be which kind of information, otherwise base station will be unable to identification.Therefore,
When implementing, can be by the way of base station notifies that UE needs to feed back which information, for example, can notify that UE feeds back following letter
Breath：
First, can notify that UE carries out channel measurement respectively to the reference signal of the antenna port subset of each needs measurement,
And the channel condition information of each antenna port subset for needing measurement is fed back respectively；For example notify that UE1 needs to measure antenna end
The reference signal of openning collection N1, N2 and N3, then UE1 can obtain the channel condition information between UE1 and antenna port subset N1
Channel condition information CSI2/CQI2/PMI2/RI2 between CSI1/CQI1/PMI1/RI1, UE1 and antenna port subset N2,
Channel condition information CSI3/CQI3/PMI3/RI3 between UE1 and antenna port subset N3；Then, UE1 will be measured respectively
To CSI1/CQI1/PMI1/RI1, CSI2/CQI2/PMI2/RI2 and CSI3/CQI3/PMI3/RI3 feed back to base station；
The channel condition information that base station is fed back according to UE1 and other UE, wireless resource scheduling is carried out to UE1 and other UE.
2nd, can notify that UE carries out channel measurement respectively to the reference signal of the antenna port subset of each needs measurement,
The channel condition information of each antenna port subset for needing measurement is fed back respectively, and each needs the antenna end openning of measurement
Collection channel status cross-correlation information between any two；For example notify that UE1 needs to measure antenna port subset N1, N2 and N3, then UE1
Obtain the channel shape between channel condition information CSI1, UE1 between UE1 and antenna port subset N1 and antenna port subset N2
Channel condition information CSI3 between state information CSI2, UE1 and antenna port subset N3；Measurement simultaneously obtains UE1 and N1 and N2
Channel status cross-correlation information R12, and/or UE1 and N1 and N3 channel status cross-correlation information R13, and/or UE1 and N2
With the channel status cross-correlation information R23 of N3, and/or UE1 and N1, N2 and N3 channel status cross-correlation information R123.Then,
CSI1, CSI2, CSI3, R12, R13, R23, R123 are fed back to base station by UE1 respectively；Fed back according to UE1 and other UE base station
Channel condition information, wireless resource scheduling is carried out to UE1 and other UE.
Wherein, by feeding back the channel status cross-correlation information so that base station can not only know every channel itself
Channel condition information, the cross correlation between each channel can also be known, more to have for wireless resource scheduling is provided
Effect information.It should be noted that theoretically, on the channel status cross-correlation information, it is also possible to received by base station
After every channel condition information of channel itself, calculating acquisition is carried out, but, it is why mutual by UE calculating acquisition channel status
Relevant information, because UE is before to base station feedback channel condition information, it usually needs channel condition information is carried out etc.
Reason, in order to transmit in the channel, therefore base station get be UE treatment after channel condition information, if by base station receive
To after channel condition information, then the channel status cross-correlation information between each channel is calculated, be then inaccurate.And UE then may be used
The channel status cross-correlation information is calculated with according to original channel sounding data, it may therefore be assured that channel status
The accuracy of cross-correlation information.
3rd, whole combinations are carried out to the antenna port subset for needing measurement, notifies that UE is based on all combinations
Needing the reference signal of the antenna port subset of measurement carries out channel measurement, feeds back the letter that the antenna port subset is all combined
Channel state information；For example notify that UE1 needs to measure antenna port subset N1, N2, N1 includes that antenna port 1,2, N2 includes
Antenna port 3,4, then between UE1 is while measure each antenna port (antenna port 1,2,3,4) obtained in UE1 and N1, N2
Channel condition information CSI12, CSI12 is then fed back into base station；The channel status letter that base station is fed back according to UE1 and other UE
Breath, wireless resource scheduling is carried out to U1 and other UE.
4th, part combination is carried out to the antenna port subset for needing measurement, notifies that UE is based on part combination
Needing the reference signal of the antenna port subset of measurement carries out channel measurement, and feeds back the channel of each antenna port sub-combinations
Status information, and/or, each antenna port sub-combinations channel status cross-correlation information between any two.For example notify that UE1 is needed
Antenna port subset N1, N2, N3 and N4 are measured, base station can be combined antenna port subset N1, N2, N3, N4 are carried out
Combination；UE1 measurements and the channel condition information of the combined antenna port subset N12 of N1 and N2 are notified, CSI12 is obtained；And measure
With the channel condition information of the combined antenna port subset N34 of N3 and N4, CSI34 is obtained；Can also measure simultaneously and obtain and N12
Channel status cross-correlation information R1234 and N34 between.Then, CSI12, CSI34, R1234 are fed back into base station A.
It is of course also possible to use other parts combination, for example, base station can also notify that UE1 is measured and N1 and N3
Combined antenna port subset N12 channel condition information, obtain CSI13；And measure sub with the combined antenna port of N2 and N4
Collect the channel condition information of N24, obtain CSI24；The channel status obtained between N13 and N24 can also be measured simultaneously mutual
Pass information R1324.Then, CSI13, U2CSI24, R1324 are fed back to base station A by UE1.Fed back according to UE1 and other UE base station
Channel condition information, wireless resource scheduling is carried out to UE1 and other UE.Certainly, the number according to antenna port subset is not
Together, the mode of part combination may be diversified, in view of length is limited, no longer enumerate here.
It should be noted that the channel condition information of certain antenna port subset, is by measuring the antenna port subset
In the reference signal of each antenna port obtain；What the channel status cross-correlation information between antenna port subset embodied is each
The cross correlation of channel between individual antenna port subset, for example, the channel status cross-correlation information between N1 and N2, it may be necessary to
Channel condition information CSI1, CSI2 of N1, N2 are first calculated respectively, then calculate correlation between the two；And the group of N1, N2
The channel condition information for closing antenna port subset N12 is the reference signal by measuring each antenna port in N1, and N2
In the reference signal of each antenna port obtain, merge equivalent to by two antenna port subsets, collection after being merged
The channel condition information of conjunction, for example, N1 includes that antenna port 1,2, N2 includes antenna port 3,4, combined antenna port
The channel condition information for collecting N12 is directly to be calculated according to the reference signal of antenna port 1,2,3,4.
It is further to note that for UE, how to calculate antenna end according to the reference signal of each antenna port
Channel status cross correlation information between the channel condition information of openning collection, and each antenna port subset, can be based on
Prior art finds solution, repeats no more here.
One of ordinary skill in the art will appreciate that all or part of step in realizing above-described embodiment method can be
The hardware of correlation is instructed to complete by program, described program can be stored in a computer read/write memory medium,
The program upon execution, comprises the following steps：It is that UE determines to need the day of measurement according to the current status information of user equipment (UE)
Line port subset；Notify that UE carries out channel measurement and fed-back channel status letter for the antenna port subset for needing measurement
Breath.Described storage medium, such as：ROM/RAM, magnetic disc, CD etc..
Embodiment two, the method for the channel measurement provided referring to Fig. 3, the embodiment of the present invention two are comprised the following steps：
S301：According to itself the current status information known from base station, from advance ready-portioned each antenna end openning
Concentrate, selection needs the antenna port subset of measurement；
It should be noted that UE can obtain the status information of itself from the down channel message of base station（Work as including UE
The information such as preceding residing transmission state, geographical position, path loss, translational speed）, these down channel message may not be special
Door is used as the message that channel measurement is indicated, but, as long as UE can receive these message, just can therefrom get required shape
State information.Further, since status information is obtained from the down channel message of base station, it may therefore be assured that base station is also known
The current states of UE are known, so that base station can exactly know that UE selects the foundation of antenna port subset, and UE is correctly parsed
Feedack.
S302：Channel measurement and feeding back channel state information are carried out for the antenna port subset for needing measurement.
Itself the current status information specifically known from base station in basis, from advance ready-portioned each antenna end openning
Concentrate, when selection needs the antenna port subset of measurement, UE can obtain the current state information of UE from base station first；Then root
According to the corresponding relation of itself current status information and the antenna port subset described in making an appointment with base station, drawn from advance
In each antenna port subset divided, selection needs the antenna port subset of measurement.Additionally, UE believes to the base station feedback
While channel state information, can also be to antenna port subset identification information described in the base station feedback.
When the antenna port subset for needing to measure is for multiple, UE is in fed-back channel status, it is necessary to according to base station
Can know and be fed back otherwise.Concrete implementation mode can include：Mode one, UE in feeding back channel state information,
Mode according to being made an appointment with base station is carried out, and for example base station is in advance by information feedback order and/or each antenna end
The information such as the combination of openning collection are notified to UE（These letters can be carried when antenna port dividing condition is notified to UE
Breath）, correctly recognized in order to base station and parsed；Mode two, can independently be selected the feedback of channel condition information by UE
Combination of order and/or each antenna port subset etc..But in which two times, it is necessary in feeding back channel state information
Meanwhile, to the mark of the combination of the identification information of antenna port subset described in the base station feedback and/or the antenna port subset
Knowledge information, is correctly recognized and is parsed in order to base station.Specifically, can add in the message of feeding back channel state information
Enter the information such as antenna port subset identification and/or combination mark, notify that the channel condition information selected described in base station is anti-with this
Feedback order, combination of each antenna port subset etc..
The embodiment two is with the difference of embodiment one, is to need UE feeding back channel state informations in embodiment one
When, it is the antenna port subset that UE selections need measurement by base station.And be the advance division by antenna port in the embodiment two
Situation and partitioning standards notify that, to UE, UE can be according to the status information of itself, independently to select corresponding antenna port subset
Measure and feeding back channel state information.That is, the executive agent of each step is base station in embodiment one, and each in embodiment two
The executive agent of step is UE.
The specific method for dividing antenna port subset can be identical with described in embodiment one, repeats no more here.
The embodiment two is described in detail below by a specific example.
For example, when being divided according to the transmission mode of UE, base station can prenotice all possible set sides of UE
Formula, and identify the corresponding transmission mode of every kind of set.When UE is in certain transmission mode, then UE is using associative mode
Set carries out channel condition information measurement and feedback.One pattern switching mark can be further set, if cell is realized leading to
Know that UE switchings are designated to be automatically switched according to transmission mode, then when UE is in certain transmission mode, then UE uses associative mode
Set carry out channel condition information measurement and feedback；Even if otherwise then when UE is in certain transmission mode, UE also will not be automatic
Convert the set of measurement.
In this example embodiment, therefore, it is possible to know UE feedbacks which is because base station knows the transmission mode that UE is presently in
The channel condition information of individual antenna port subset.It can be seen that, in the method that the embodiment two is provided, the example is a kind of preferred
Implementation method.
One of ordinary skill in the art will appreciate that all or part of step in realizing above-described embodiment method can be
The hardware of correlation is instructed to complete by program, described program can be stored in a computer read/write memory medium,
The program upon execution, comprises the following steps：According to itself the current status information known from base station, from ready-portioned in advance
In each antenna port subset, selection needs the antenna port subset of measurement；For the antenna port subset for needing and measuring
Carry out channel measurement and feeding back channel state information.Described storage medium, such as：ROM/RAM, magnetic disc, CD etc..
Corresponding with the method that the embodiment of the present invention one is provided, the embodiment of the present invention additionally provides one kind and realizes channel measurement
Device, referring to Fig. 4, the device includes：
Determining unit U401, for according to UE current status information, being that UE determines to need the antenna port subset of measurement；
Notification unit U402, for notifying that UE carries out channel measurement simultaneously instead for the antenna port subset for needing measurement
Feedback channel condition information.
By device provided in an embodiment of the present invention, base station can be directed to the status information of UE, notify that UE is only measured and anti-
The channel condition information of feedback some antennas port, therefore, reduce feedback overheads of the UE to channel condition information.
When implementing, directly can determine to be suitable for the antenna end of UE current states from multiple antenna ports of base station
Mouthful, by these antenna port（Can be one or more）As the antenna port subset for needing measurement；Can also in advance by day
Line end mouthful set is divided into multiple antenna port subsets, then according to the status information that UE is current, from each antenna port subset
In select need measurement antenna port subset, now, referring to Fig. 5, determining unit U402 can include：
Selection subelement U4021, for according to UE current status information, from advance ready-portioned each antenna end openning
Concentrate, be the antenna port subset of the UE selections needs measurement.
When antenna port set is divided into multiple antenna port subsets in advance, can be according to many factors, its
In, can be divided according to the temporal correlation of channel, now, described each antenna port subset can include being applied to not
With the antenna port subset of UE translational speeds；The UE current status information includes the current translational speeds of UE；Selection is single
First U4021 can include：
First choice subelement, for according to UE current translational speed, selection to be adapted to the antenna end of the UE translational speeds
Openning collection.
In distributed antenna system, it is also possible to which the geographical position according to antenna port carries out drawing for antenna port subset
Point, now, described each antenna port subset can include the antenna port subset divided according to the geographical position of antenna；It is described
UE current status information includes the information on path loss and/or the current geographical position of UE between UE and each antenna port subset
Information；Selection subelement U4021 can include：
Second selection subelement, for according to the information on path loss between UE and each antenna port subset, selecting and being somebody's turn to do
The path loss of UE meets the antenna port subset of prerequisite；
And/or,
3rd selection subelement, for according to UE current geographical location information, selection to meet preset with the distance of the UE
The antenna port subset of condition.
The division of antenna port subset can also be carried out according to the transmission mode of UE, now, described each antenna end openning
Collection includes the antenna port subset suitable for different transmission mode；The UE current status information includes the currently used biographies of UE
Defeated pattern；Selection subelement U4021 can include：
4th selection subelement, for according to UE currently used transmission mode, transmission mode of the selection suitable for the UE
Antenna port subset.
Wherein, the transmission mode can include CoMP transmission pattern, be carried out in the transmission mode that may be used according to UE
During division, special configuration only can be carried out to the reference signal that the antenna port subset for CoMP patterns sends, it is other
The reference signal of antenna port may not necessarily carry out this special configuration, and now, the system can also include：
Dispensing unit, for the reference signal foundation for only being sent to the antenna port subset suitable for CoMP transmission pattern
The feature of CoMP transmission pattern is configured.
When the antenna port subset measured the need for selection from advance ready-portioned each antenna port subset is
When at least two, notification unit U402 can include：
First notifies subelement, for notifying that UE enters respectively to the reference signal of the antenna port subset of each needs measurement
Row channel measurement, and the channel condition information of each antenna port subset for needing measurement is fed back respectively；
Or,
Second notifies subelement, for notifying that UE enters respectively to the reference signal of the antenna port subset of each needs measurement
Row channel measurement, feeds back the channel condition information of each antenna port subset for needing measurement respectively, and each needs measurement
Antenna port subset channel status cross-correlation information between any two；
Or,
Third notice subelement, for carrying out whole combinations to the antenna port subset for needing measurement, notifies UE bases
The reference signal of the antenna port subset measured the need for all combinations carries out channel measurement, and feeds back the antenna end
The channel condition information that openning collection is all combined；
Or,
4th notifies subelement, for carrying out part combination to the antenna port subset for needing measurement, notifies UE bases
The reference signal of the antenna port subset measured the need for the part is combined carries out channel measurement, and feeds back each antenna end
The channel condition information of mouth sub-combinations, and/or, each antenna port sub-combinations channel status cross-correlation letter between any two
Breath.
Corresponding with the method and device that the embodiment of the present invention one is provided, the embodiment of the present invention additionally provides a kind of user and sets
Standby, referring to Fig. 6, the user equipment includes：
Notification receiving unit U601, the notice for receiving base station transmission, knows the antenna port subset for needing measurement；Institute
Stating needs the antenna port subset of measurement to be determined according to the current status information of the user equipment by the base station；
Measurement feedback unit U602, for carrying out channel measurement and feeding back for the antenna port subset for needing measurement
Channel condition information.
Wherein, the tool of the antenna port subset that base station determines to need measurement according to the current status information of the user equipment
The contents such as body method as it was noted above, repeat no more here.
Corresponding with the method that the embodiment of the present invention two is provided, the embodiment of the present invention additionally provides another kind and realizes that channel is surveyed
The device of amount, referring to Fig. 7, the device includes：
Select unit U701, for itself current status information that basis is known from base station, from ready-portioned in advance each
In individual antenna port subset, selection needs the antenna port subset of measurement；
Feedback unit U702, for carrying out channel measurement and feedback channel for the antenna port subset for needing measurement
Status information.
By device provided in an embodiment of the present invention, UE can be according to the status information of itself known from base station, from pre-
The dividing condition of the antenna port subset first known from base station, selection needs the antenna port subset of measurement, thus can be only
The channel condition information of simultaneously feedback fraction antenna port is measured, therefore, reduce feedback overheads of the UE to channel condition information.
Wherein, select unit U702 can specifically include：
Oneself state acquisition of information subelement, for obtaining itself current status information from base station；
Selection subelement, for basis and base station make an appointment described in itself current status information and the antenna end
The corresponding relation of openning collection, from advance ready-portioned each antenna port subset, selection needs the antenna port subset of measurement.
UE, can also be to the antenna port subset of the actual measurement of base station feedback when to base station feedback channel condition information
Identification information, now, the device can also include：
Identification information feedback unit, for antenna port subset identification information described in the base station feedback.
Wherein, when the antenna port subset for needing to measure is at least two, feedback unit U702 includes：
By regulation feedback subelement, for according to the channel condition information made an appointment with base station feedback order and/or
The combination of antenna port subset, channel measurement and feedback channel shape are carried out for the antenna port subset for needing measurement
State information；
Or,
From primary feedback subelement, for the feedback order and/or each antenna port subset of autonomous selection channel condition information
Combination, carry out channel measurement and feeding back channel state information for the antenna port subset for needing measurement；And it is anti-
Present the identification information of the antenna port subset and/or the combination identification information of the antenna port subset.
Above to the method and device for realizing channel measurement provided by the present invention, it is described in detail, herein should
Principle of the invention and implementation method are set forth with specific case, the explanation of above example is only intended to help and manages
The solution method of the present invention and its core concept；Simultaneously for those of ordinary skill in the art, according to thought of the invention,
Be will change in specific embodiment and range of application.In sum, this specification content should not be construed as to this hair
Bright limitation.
Claims (21)
1. a kind of method for realizing channel measurement, it is characterised in that including：
It is described from advance ready-portioned each antenna port subset according to the currently used transmission mode of user equipment (UE)
UE selections need one or more antenna port subsets of measurement；
Notify that the UE carries out channel measurement and feedback channel for described one or more antenna port subsets for needing measurement
Status information.
2. method according to claim 1, it is characterised in that methods described also includes：
Receive the channel condition information of one or more antenna port subsets of the needs measurement of the UE feedbacks.
3. method according to claim 1 and 2, it is characterised in that the transmission mode includes cooperative multipoint transmission CoMP
Transmission mode.
4. method according to claim 3, it is characterised in that methods described also includes：
The reference signal that only one or more the antenna port subsets suitable for CoMP transmission pattern are sent, according to CoMP transmission
The feature of pattern is configured.
5. method according to claim 1, it is characterised in that the transmission mode currently used according to UE, from advance
It is that one or more antenna port subsets of the UE selections needs measurement include in ready-portioned each antenna port subset：
According to the currently used transmission modes of the UE, one or more of antennas of the selection suitable for the transmission mode of the UE
Port subset.
6. method according to claim 1, it is characterised in that when described from advance ready-portioned each antenna port subset
In, it is described to notify that the UE is directed to the need when antenna port subset for being measurement the need for the UE is selected is at least two
The antenna port subset to be measured carries out channel measurement and feeding back channel state information to be included：
Notify that the UE carries out channel measurement to the reference signal of the antenna port subset of each needs measurement respectively, and it is anti-respectively
Present the channel condition information of each antenna port subset for needing measurement；
Or,
Notify that UE carries out channel measurement respectively to the reference signal of the antenna port subset of each needs measurement, each is fed back respectively
Need the channel condition information of the antenna port subset of measurement, and each needs the antenna port subset of measurement between any two
Channel status cross-correlation information；
Or,
Whole combinations are carried out to the antenna port subset for needing measurement, notifies that UE is measured the need for being based on all combinations
The reference signal of antenna port subset carry out channel measurement, and feed back the channel status of the whole combination of the antenna port subset
Information；
Or,
Part combination is carried out to the antenna port subset for needing measurement, notifies that UE is based on being measured the need for the part is combined
The reference signal of antenna port subset carry out channel measurement, and feed back the channel status letter of each antenna port sub-combinations
Breath, and/or, each antenna port sub-combinations channel status cross-correlation information between any two.
7. a kind of method for realizing channel measurement, it is characterised in that including：
The notice that channel measurement is carried out for one or more the antenna port subsets for needing to measure is received, it is one or more of
Antenna port subset is according to the currently used transmission mode of user equipment (UE), from advance ready-portioned each antenna port subset
Middle selection；
Channel measurement is carried out to described one or more antenna port subsets for needing measurement, one or more of antennas are obtained
The channel condition information of port subset.
8. method according to claim 7, it is characterised in that methods described also includes：
Send the channel condition information of one or more antenna port subsets of the acquisition.
9. the method according to claim 7 or 8, it is characterised in that the transmission mode includes cooperative multipoint transmission CoMP
Transmission mode.
10. the method according to claim 7 or 8, it is characterised in that described that one or more antenna port subsets are carried out
Channel measurement simultaneously obtains channel condition information and includes：
Reference signal to the antenna port subset of each needs measurement carries out channel measurement and obtains each antenna port subset
The corresponding channel condition information of difference；
Or
The reference signal of the antenna port subset measured the need for all combinations carries out channel measurement and obtains what is all combined
The corresponding channel condition information of antenna port subset；Or
The reference signal of the antenna port subset measured the need for being combined to part carries out channel measurement and obtains part combination
The corresponding channel condition information of antenna port subset.
11. methods according to claim 8, it is characterised in that one or more antenna end opennings that the transmission is obtained
The channel condition information of collection includes：
The antenna port subset that sending each needs measurement distinguishes corresponding channel condition information；Or
The antenna port subset that sending each needs measurement distinguishes corresponding channel condition information, and each needs the day of measurement
Line port subset channel status cross-correlation information between any two；Or
Send the antenna port subset all corresponding channel condition informations of combination；Or
The channel condition information corresponding to each antenna port sub-combinations is sent, and/or, each antenna port sub-combinations two
Channel status cross-correlation information between two.
A kind of 12. devices for realizing channel measurement, it is characterised in that including：
For according to the currently used transmission mode of user equipment (UE), from advance ready-portioned each antenna port subset, being
The UE selections need the unit of one or more antenna port subsets of measurement；
For notifying that the UE carries out channel measurement and feed back for described one or more antenna port subsets for needing measurement
The unit of channel condition information.
13. devices according to claim 12, it is characterised in that described device also includes：
The channel condition information of one or more the antenna port subsets measured for the needs for receiving the UE feedbacks
Unit.
14. device according to claim 12 or 13, it is characterised in that the transmission mode includes cooperative multipoint transmission
CoMP transmission pattern.
15. devices according to claim 14, it is characterised in that described device also includes：
For the reference signal for only being sent to one or more the antenna port subsets suitable for CoMP transmission pattern, according to CoMP
The unit that the feature of transmission mode is configured.
16. devices according to claim 12, it is characterised in that described for notifying that the UE needs measurement for described
One or more antenna port subsets carry out the unit of channel measurement and feeding back channel state information specifically for：
Notify that the UE carries out channel measurement to the reference signal of the antenna port subset of each needs measurement respectively, and it is anti-respectively
Present each need measurement antenna port subset channel condition information, wherein it is described need measurement antenna port subset be to
It is few two；
Or,
Notify that UE carries out channel measurement respectively to the reference signal of the antenna port subset of each needs measurement, each is fed back respectively
Need the channel condition information of the antenna port subset of measurement, and each needs the antenna port subset of measurement between any two
Channel status cross-correlation information, wherein the antenna port subset for needing to measure is at least two；
Or,
Whole combinations are carried out to the antenna port subset for needing measurement, notifies that UE is measured the need for being based on all combinations
The reference signal of antenna port subset carry out channel measurement, and feed back the channel status of the whole combination of the antenna port subset
Information, wherein the antenna port subset for needing to measure is at least two；
Or,
Part combination is carried out to the antenna port subset for needing measurement, notifies that UE is based on being measured the need for the part is combined
The reference signal of antenna port subset carry out channel measurement, and feed back the channel status letter of each antenna port sub-combinations
Breath, wherein it is described need measurement antenna port subset be at least two, and/or, each antenna port sub-combinations two-by-two it
Between channel status cross-correlation information.
A kind of 17. devices for realizing channel measurement, it is characterised in that including：
The unit of channel measurement notice, described one are carried out for one or more the antenna port subsets for needing to measure for receiving
Individual or multiple antenna port subsets are according to UE currently used transmission mode, from advance ready-portioned each antenna port subset
Middle selection；
For carrying out channel measurement to described one or more antenna port subsets for needing measurement, obtain one or more of
The unit of the channel condition information of antenna port subset.
18. devices according to claim 17, it is characterised in that described device also includes：
Unit for sending the channel condition information of one or more the antenna port subsets for needing measurement.
19. device according to claim 17 or 18, it is characterised in that the transmission mode includes cooperative multipoint transmission
CoMP transmission pattern.
20. device according to claim 17 or 18, it is characterised in that it is described for it is described need measurement one or
Multiple antenna port subsets carry out channel measurement, obtain the list of the channel condition information of one or more of antenna port subsets
Unit specifically for：
Reference signal to the antenna port subset of each needs measurement carries out channel measurement and obtains each antenna port subset
The corresponding channel condition information of difference；Or
The reference signal of the antenna port subset measured the need for all combinations carries out channel measurement and obtains what is all combined
The corresponding channel condition information of antenna port subset；Or
The reference signal of the antenna port subset measured the need for being combined to part carries out channel measurement and obtains part combination
The corresponding channel condition information of antenna port subset.
21. devices according to claim 18, it is characterised in that described for sending one or more antenna ends for obtaining
The unit of the channel condition information of openning collection specifically for：
The antenna port subset that sending each needs measurement distinguishes corresponding channel condition information；Or
The antenna port subset that sending each needs measurement distinguishes corresponding channel condition information, and each needs the day of measurement
Line port subset channel status cross-correlation information between any two；Or
Send the antenna port subset all corresponding channel condition informations of combination；Or
The channel condition information corresponding to each antenna port sub-combinations is sent, and/or, each antenna port sub-combinations two
Channel status cross-correlation information between two.
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| CN200910208525.3A CN102056220B (en) | 2009-10-28 | 2009-10-28 | Method and device for realizing channel measurement |
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| CN105376723B (en) * | 2014-08-21 | 2019-06-14 | 中兴通讯股份有限公司 | A kind of method, base station and terminal for realizing Radio Link processing |
| CN104239951B (en) * | 2014-09-10 | 2017-01-25 | 西安交通大学 | Unbound people counting method achieved by means of channel state information |
| US10476563B2 (en) * | 2014-11-06 | 2019-11-12 | Futurewei Technologies, Inc. | System and method for beam-formed channel state reference signals |
| CN105871515B (en) * | 2015-01-23 | 2019-07-19 | 电信科学技术研究院 | A kind of channel state information feedback method, downlink reference signal method and device |
| US10554280B2 (en) * | 2015-05-01 | 2020-02-04 | Futurewei Technologies, Inc. | Device, network, and method for CSI feedback of hybrid beamforming |
| CN107026681B (en) * | 2016-02-01 | 2022-01-14 | 北京三星通信技术研究有限公司 | Signal sending method, receiving method, transmitter and receiver |
| WO2018171786A1 (en) * | 2017-03-24 | 2018-09-27 | 华为技术有限公司 | Information transmission method and device |
| CN113965231A (en) | 2017-03-24 | 2022-01-21 | 华为技术有限公司 | Information transmission method and equipment |
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| WO2019237303A1 (en) * | 2018-06-14 | 2019-12-19 | 华为技术有限公司 | Method for transmitting channel state information, related apparatus, and communication system |
| CN110875766B (en) * | 2018-08-29 | 2021-05-25 | 电信科学技术研究院有限公司 | Channel state information feedback method, precoding matrix determination method and device |
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