CN102170330B - The sending method and system of measuring reference signals - Google Patents
The sending method and system of measuring reference signals Download PDFInfo
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- CN102170330B CN102170330B CN201110111822.3A CN201110111822A CN102170330B CN 102170330 B CN102170330 B CN 102170330B CN 201110111822 A CN201110111822 A CN 201110111822A CN 102170330 B CN102170330 B CN 102170330B
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Abstract
The invention provides a kind of sending method of measuring reference signals and system, wherein, the above method, including：Base station issues the configuration information for sending measuring reference signals SRS to user terminal, wherein, the configuration information includes：Precoding enable instruction for indicating whether to carry out SRS precoding；User terminal receives configuration information；When precoding enable instruction indicates to enable, user terminal carries out precoding to the SRS to be sent, and sends the SRS after precoding to base station；When precoding enable instruction indicates not enable, the SRS for not carrying out precoding is sent to base station.The above-mentioned technological means provided using the present invention, solve the technical problems such as user's multiplexing capacity deficiency of SRS in correlation technique, it is achieved thereby that saving SRS resource, the purpose of SRS resource utilization rate is more efficiently improved, and then has reached the effect for the user's multiplexing capacity for improving SRS.
Description
Technical field
The present invention relates to the communications field, more particularly, to a kind of measuring reference signals (Sounding Reference
Signal, referred to as SRS) sending method and system.
Background technology
The uplink physical channel of Long Term Evolution (Long Term Evolution, referred to as LTE) system includes physical accidental
Access channel (Physical Random Access Channel, referred to as PRACH), Physical Uplink Shared Channel
(Physical uplink shared channel, referred to as PUSCH), Physical Uplink Control Channel (Physical uplink
Control channel, referred to as PUCCH).
In LTE, and physical downlink control channel PDCCH (Physical downlink control channel, referred to as
For PDCCH) it is used to carry uplink and downlink schedule information, and uplink power control information.Base station (e-Node-B, referred to as eNB)
User terminal (User Equipment, referred to as UE) can be configured by Downlink Control Information, or terminal device receives high
The configuration of layer (higher layers), also referred to as configures UE by high-level signaling.Downlink Control Information (Downlink
Control Information, referred to as DCI) form (format) be divided into DCI format 0,1,1A, 1B, 1C, 1D, 2,
2A, 2B, 3,3A etc..Wherein,
DCI format 0 be used for indicate Physical Uplink Shared Channel (Physical uplink shared channel,
Referred to as PUSCH) scheduling；
DCI format 1,1A, 1B, 1C, 1D are used for the Physical Downlink Shared Channel (Physical of single transport block
Downlink Shared Channel, referred to as PDSCH) different transmission mode；
DCI format 2,2A, 2B are used for the different transmission mode of descending PDSCH space division multiplexings；
DCI format 3,3A be used for Physical Uplink Control Channel (Physical uplink control channel,
Referred to as PUCCH) and PUSCH power control instruction transmission.
Above-mentioned DCI format 0,1A, 3,3A transport block size is the same, wherein DCI format 0, and 1A uses 1 bit
Enter row format differentiation.
SRS is to be used for measuring radio channel information (Channel State between a kind of terminal device and base station
Information, referred to as CSI) signal.In long evolving system, bandwidth that UE is indicated according to eNB, frequency domain position, sequence
The parameters such as row cyclic shift, cycle and sub-frame offset, regularly send up on last data symbol for sending subframe
SRS.ENB judges the up CSI of UE according to the SRS received, and carries out frequency domain selection scheduling, closed loop work(according to obtained CSI
The operations such as rate control.
In LTE system, the SRS sequences that UE is sent are by a root sequenceCyclic shift α is carried out in time domain
Obtain.Different cyclic shift α are carried out to same root sequence, it becomes possible to obtain different SRS sequences, and obtain this
It is mutually orthogonal between a little SRS sequences, it therefore, it can these SRS sequences distributing to different UE and use, to realize the code between UE
Divide multiple access.In LTE system, 8 cyclic shift α of SRS sequence definitions are provided by following formula (1)：
... formula (1)
Wherein,Indicated by 3bit signaling, respectively 0,1,2,3,4,5,6 and 7.That is, in same time-frequency
Under resource, the UE in cell has 8 available code resources, and eNB can at most configure 8 UE on identical running time-frequency resource simultaneously
Send SRS.Formula (1) is considered as SRS sequences being divided into 8 parts at equal intervals in time domain, but due to SRS sequence lengths for 12 times
Number, so the minimum length of SRS sequences is 24.
In LTE system, SRS frequency domain bandwidth is configured using tree.Each SRS band width configuration (SRS
Bandwidth configuration) one tree structure of correspondence, the SRS bandwidth (SRS- of top (or being first layer)
Bandwidth) to should SRS band width configurations maximum SRS bandwidth, or for SRS bandwidth ranges.UE refers to according to the signaling of base station
Show, calculating is obtained after the SRS bandwidth of itself, the top signaling frequency domain position n sent further according to eNBRRCTo determine itself to send
SRS frequency domain initial position.Fig. 1 is the different n of distribution of correlation techniqueRRCUE send SRS frequency domain initial position schematic diagram,
As shown in figure 1, being assigned with different nRRCUE will cell SRS bandwidth different zones send SRS, wherein, UE1 is according to nRRC=
0 determines to send SRS frequency initial position, and UE2 is according to nRRC=3 determine to send SRS frequency initial position, and UE3 is according to nRRC
=4 determine to send SRS frequency initial position, and UE4 is according to nRRC=6 determine to send SRS frequency initial position.
Sequence used in SRS is selected from demodulation pilot frequency sequence group, when UE SRS is with a width of 4 resource blocks
When (Resource Block, referred to as RB), (Computer Generated, abbreviation are generated using the computer that length is 2 RB
For CG) sequence；When UE SRS bands are wider than 4 RB, the Zadoff-Chu sequence of correspondence length is used.
In addition, in same SRS bandwidth, SRS subcarrier (sub-carrier) is spaced apart, that is to say, that
SRS transmission uses the quantity of the frequency comb (frequency comb) in pectinate texture, LTE system to be 2, also corresponds to time domain
Repeat factor value (RePetition Factor, referred to as RPF) be 2.Fig. 2 is the SRS of correlation technique pectinate texture signal
Figure, as shown in Fig. 2 when each UE sends SRS, only using one in two frequency combs, comb=0 or comb=1.So,
UE only indexes the subcarrier for even number or odd number according to the frequency comb comb position instructions of the top signaling of 1 bit using frequency domain
Send SRS.This pectinate texture allows more UE to send SRS in same SRS bandwidth.
In same SRS bandwidth, multiple UE can use different cyclic shifts in same frequency comb, then pass through
Code division multiplexing send SRS, can also two UE in different frequency combs, SRS is sent by frequency division multiplexing.For example, exist
In LTE system, SRS UE is sent in some SRS bandwidth (4 RB), the cyclic shift that can be used there are 8, can used
Frequency comb be 2, the resource that thus a total of 16 of UE can be used to send SRS, that is to say, that in this SRS bandwidth,
16 SRS can be at most sent simultaneously.Due to not supporting uplink single user multiple-input and multiple-output (Single in LTE system
User Multiple Input Multiple Output, referred to as SU-MI MO), UE can only have a day at each moment
Line sends SRS, so a UE only needs to a SRS resource, therefore, in above-mentioned SRS bandwidth, system can at most be answered simultaneously
With 16 UE.
Senior LTE (LTE-Advanced, referred to as LTE-A) system is the evolution system of future generation of LTE system, up
SU-MIMO is supported, and can at most use 4 antennas as up transmitting antenna.That is, UE can be with synchronization
Send SRS simultaneously on many antennas, and eNB needs to estimate the shape on every channel according to the SRS received on every antenna
State.Descending control information format is on the basis of the original forms of LTE, and adding format 4 is used for uplink MEVlO transmissions,
Format 2C are used for the MIMO transmission of descending 8 antenna.
Proposed in the research of existing LTE-A Release 10 (LTE-A versions 10)：In uplink communication, it should make
With the SRS of non-precoded (i.e. antenna is proprietary), and precoding is then carried out to PUSCH DMRS.Base station is by receiving non-precoded
SRS, up original CSI can be estimated, and have passed through precoding DMRS that base station can not then estimated is up original
CSI.Now, when UE sends the SRS of non-precoded using multiple antennas, the SRS resource required for each UE can increase, also
Causing in system can be declined with the UE quantity of concurrent multiplexing.UE (can also referred to as pass through trigger type by high-level signaling
0 triggering) or Downlink Control Information (also referred to as triggered by trigger type 1) both triggering modes send SRS, be based on
High-level signaling triggering for cycle SRS, that triggered based on Downlink Control Information is aperiodic SRS, although in LTE-A Release
Aperiodic transmission SRS mode is added in 10, the utilization rate of SRS resource is improved to a certain extent, scheduling of resource is improved
Flexibility, but in following LTE-A Release 11 (LTE-A versions 11) researchs, CoMP (Coordinated Multi-
Point, coordinate multipoint) system, in order to reduce UE feedback quantity, can usually be obtained down using channel reciprocity by measuring SRS
Row CSI, therefore, higher requirement is just proposed to SRS multiplexing capacity.SRS resource how is further saved, SRS is improved
Resource utilization, to realize that more effectively aperiodic transmission SRS and cycle send SRS, more effectively support CoMP system application,
The problem of being to be solved.For the above mentioned problem in correlation technique, effective solution is there is no at present.
The content of the invention
It is a primary object of the present invention to provide the sending method and system of a kind of measuring reference signals, at least to solve
State problem.
According to an aspect of the invention, there is provided a kind of sending method of measuring reference signals, including：Base station is to user
Terminal issues the configuration information for sending SRS, wherein, the configuration information includes：For indicating whether carry out the pre- of precoding to SRS
Encode enable instruction；User terminal receives configuration information；When precoding enable instruction indicates to enable, user terminal
Precoding is carried out to the SRS to be sent, and the SRS after precoding is sent to base station；Indicated not in precoding enable instruction
During enable, the SRS for not carrying out precoding is sent to the base station.
According to another aspect of the present invention there is provided a kind of transmission system of measuring reference signals, including：Base station and user
Terminal.Wherein, base station, including：First sending module, SRS configuration information is sent for being issued to user terminal, wherein, should
Configuration information includes：Precoding enable instruction for indicating whether to carry out SRS precoding；User terminal, including：Connect
Module is received, for receiving configuration information；Precoding module, for when precoding enable instruction indicates to enable, to send out
The SRS sent carries out precoding；Second sending module, refers to for sending the SRS after precoding to base station, and in precoding enable
When showing that information indicates not enable, the SRS for not carrying out precoding is sent to base station.
The present invention, the configuration information issued according to the SRS to be sent to user terminal from base station to user terminal prelists
Code, is solved in correlation technique, the technical problem such as SRS user's multiplexing capacity deficiency, it is achieved thereby that saving SRS resource, more
Plus the purpose of SRS resource utilization rate is effectively improved, and then reached the effect for the user's multiplexing capacity for improving SRS.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the different n of distribution according to correlation techniqueRRCUE send SRS frequency domain initial position schematic diagram；
Fig. 2 is the pectinate texture schematic diagram of the SRS according to correlation technique；
Fig. 3 is the flow chart of the sending method of the measuring reference signals according to the embodiment of the present invention；
Fig. 4 is the schematic diagram of the transmission cycle SRS and aperiodic SRS according to present example；
Fig. 5 is to issue the schematic diagram that the SRS of precoding is crossed in the warp let-off according to the CoMP system of present example；
Fig. 6 is the structured flowchart of the transmission system of the measuring reference signals according to the embodiment of the present invention；
Fig. 7 is the structural representation of the transmission system of the measuring reference signals according to the preferred embodiment of the present invention.
Embodiment
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
Fig. 3 is the flow chart of the sending method of the measuring reference signals according to the embodiment of the present invention.As shown in figure 3, the party
Method includes：
Step S302, base station issues the configuration information for sending SRS to user terminal UE, wherein, the configuration information includes：With
The precoding enable instruction of precoding whether is carried out to SRS in instruction；
Step S304, user terminal receives configuration information；
Step S306, when precoding enable instruction indicates to enable, UE carries out precoding to the SRS to be sent, and
The SRS after precoding is sent to base station；When the precoding enable instruction indicates not enable, send and do not carry out to base station
The SRS of precoding.
In above-described embodiment, because user terminal has carried out precoding to the SRS to be sent, SRS resource is saved, from
And improve SRS user's multiplexing capacity.
During concrete application, above-mentioned configuration information can also include：SRS precoding information；UE is according to precoding
Information carries out precoding to the SRS to be sent.Wherein, above-mentioned precoding information indicates that SRS used during precoding
Pre-coding matrix.Certainly, in the specific implementation, the precoding information that UE can also be obtained according to other channels is prelisted
Code, for example, UE can be encoded etc. according to the default precoding informations of UE.
Because in correlation technique, general base station triggers UE is sent after SRS, and UE only sends a SRS, so, needed in base station
When wanting many transmission SRS of UE, base station is also required to send the instruction that triggering UE sends SRS several times, and DCI signaling consumptions are big.Therefore,
To solve the above problems, during concrete application, above-mentioned configuration information can also include：SRS transmission times information, then UE
SRS (including SRS after the precoding or SRS for not carrying out precoding) is sent to base station according to transmission times information.So, pass through
Set in configuration information and send SRS number informations, UE just can be set to send SRS number of times, when base station needs many hairs of UE
When sending SRS, it is not necessary to the instruction that triggering UE sends SRS is sent every time, so as to improve operational efficiency.
In specific implementation process, as previously described, UE sends SRS, it is necessary to which base station is triggered to base station.Specific
Using when, base station, which can pass through high-level signaling or descending control signaling, triggers UE and sends SRS.Above-mentioned processing procedure can be in UE
Carried out before sending the SRS after precoding to base station.
In specific implementation process, as mentioned above, the encoder matrix information that UE can also be obtained according to other channels
Precoding is carried out, for example, the SRS that UE can also be sent according to a pair of in the following manner carries out precoding：
(1) precoding information according to entrained by presently described descending control signaling carries out precoding；
(2) precoding is carried out according to the precoding information of last transmission or nearest descending control signaling；
(3) UE is by measuring the reference signal (Reference for channel condition information in downlink reference signal
Signals targeting CSI estimation, referred to as CSI-RS) and/or the proprietary reference signal (Cell- of cell
Specific Reference signals, referred to as CRS) down channel is obtained, and predicted by channel reciprocity up
Channel, obtains left singular matrix, right singular matrix and diagonal matrix, from right singular matrix by up channel progress singular value decomposition
Column vector corresponding to the maximum singular value of middle selection is as pre-coding matrix to SRS progress precodings.In the specific implementation, on
Processing procedure is stated to specifically include：Down channel is obtained by measuring CSI-RS and/or CRS in downlink reference signal, and is led to
Cross channel reciprocity prediction up channel HUL, by HULCarry out singular value decomposition：
HUL=U Λ VH
Obtain left singular matrix U, right singular matrix V and diagonal matrix Λ, its diagonal element right and wrong of wherein diagonal matrix Λ
Negative real number, referred to as singular value, off-diagonal element are 0.Selected from right singular matrix V maximum singular value corresponding to row to
Amount carries out precoding as pre-coding matrix to SRS.
During concrete application, above-mentioned descending control signaling is one below form：format 4、format 2B、
Format 2C forms.For example, containing the SRS triggering signalings of 2 bits in format 4, and 3 kinds are configured with by high-level signaling
SRS parameter set, the SRS triggering signalings of 2 bits, " 00 " represents not trigger SRS, and " 01 ", " 10 ", " 11 " represent selection first respectively
Kind, second, the third SRS parameter set and trigger SRS.Assuming that the precoding enable instruction in the first SRS parameter set
It is configured to enable, the precoding enable instruction of second of SRS parameter set is configured to not enable, can thus passed through
2 bit SRS triggering signalings in format 4, realize precoding SRS and non-precoded SRS switching at runtime.
In specific implementation process, precoding enable instruction can indicate to enable or do not enable in the following manner：
When base station determines that UE needs the SRS sent for cycle SRS, precoding enable instruction indicates not enable；When base station is determined
When UE needs the SRS sent for aperiodic SRS, precoding enable instruction indicates to enable；Or when base station determines UE
When not having data to need transmission, precoding enable instruction indicates not enable；When base station determines that UE has data to need transmission,
Precoding enable instruction indicates to enable.
In specific implementation process, base station can issue configuration information in the following manner to UE：Base station passes through high-rise nothing
Line resources control RRC signaling issues configuration information to UE.
In specific implementation process, base station can select a long distance wireless front end (remote according to pre-defined rule
Radio head, referred to as RRH) it is connected with UE foundation.For example, base station can be according to the SRS of reception (including after precoding
The SRS or SRS for not carrying out precoding) signal intensity selection signal intensity most strong long distance wireless front end RRH and UE set up and pass
Defeated link.So, due to transmissions links need not be set up with all RRH for receiving SRS signal, Radio Link money can be saved
Source.Above-mentioned processing procedure can be carried out after UE sends the SRS after precoding to base station.
In order to more fully understand above-described embodiment, described in detail below in conjunction with instantiation and relevant drawings.
Example 1
The sending method for the measuring reference signals that this example is provided can solve that SRS multiplexing capacities in the prior art are not enough to ask
Topic.
The sending method for the measuring reference signals that this example is provided, including：
Base station triggers user terminal sends measuring reference signals, and issues the transmission measuring reference signals to user terminal
Configuration information.The configuration information includes following one or more configured informations：The precoding of measuring reference signals, which is enabled, to be referred to
Show information, the precoding information of measuring reference signals, the transmission times of measuring reference signals.Measuring reference signals in this example
Precoding enable instruction, for indicating whether measuring reference signals will carry out precoding.
User terminal sends measuring reference signals according to the configuration information of acquisition to base station.
In this example, above-mentioned base station triggers user terminal by high-level signaling or descending control signaling and sends measurement reference
Signal.
In this example, the measuring reference signals include period measurement reference signal and aperiodic measuring reference signals.This
In example, for cycle SRS then without precoding, it is for the configuration information determination that aperiodic SRS is then issued according to base station
It is no to carry out precoding.
In this example, above-mentioned configuration information is that user terminal is handed down in base station by high-rise RRC signaling.
In this example, the precoding information of measuring reference signals, what is used during for indicating that SRS carries out precoding prelists
Code matrix.
If carrying out precoding, the precoding information according to entrained by inside the descending control signaling
(Precoding Matrix Index, referred to as PMI) carries out precoding；Or according to last transmission or recently corresponding descending
The precoding information of control signaling carries out precoding；Or the precoding information in the configuration information carries out precoding；Or
Person, UE is proprietary by measuring reference signal (CSI-RS) for channel condition information and/or cell in downlink reference signal
Reference signal (CRS) to obtain down channel, and up channel is predicted by channel reciprocity, the up channel is carried out
Singular value decomposition obtains left singular matrix, right singular matrix and diagonal matrix, and the singular value of maximum is selected from right singular matrix
Corresponding column vector carries out precoding as pre-coding matrix to SRS.
Descending control signaling in this example is format 4 or format 2B or format 2C.
Embodiment 2
The sending method for the measuring reference signals that this example is provided is realized by the system including base station and user terminal.
Wherein,
Base station, sends measuring reference signals, and issue the above-mentioned measurement of transmission to user terminal for triggering user terminal
The configuration information of reference signal；
Above-mentioned configuration information includes following one or more configured informations：The precoding of measuring reference signals, which is enabled, indicates letter
Breath, the precoding information of measuring reference signals, the transmission times of measuring reference signals.
User terminal, measuring reference signals are sent for the configuration information according to acquisition to base station.
The configuration information that base station issues transmission measuring reference signals to user terminal can be matched somebody with somebody according to mode shown in Fig. 4
Put：
For cycle SRS, then it is configured to without precoding.
In this example, for aperiodic SRS, for the aperiodic SRS of the 1st triggering, then it is configured to without precoding；
For the aperiodic SRS of the 2nd time to the N+1 times, then it is configured to by precoding；For the aperiodic SRS of the N+2 times, then
It is configured to without precoding；By that analogy.Wherein, N is 2 to 1000 a certain integer, and base station can be according to user terminal institute
The factors such as scene, channel conditions, the translational speed at place configure N value.
In this example, above-mentioned configuration information is that user terminal is handed down in base station by high-rise RRC signaling.
In this example, the precoding enable instruction of above-mentioned measuring reference signals indicates that measuring reference signals whether will
Carry out precoding.
In this example, the precoding information of above-mentioned measuring reference signals indicates that what is used during SRS progress precodings prelists
Code matrix.
In this example, if to carry out precoding, the precoding letter according to entrained by inside above-mentioned descending control signaling
Breath carries out precoding；Or precoding is carried out according to the precoding information of last transmission or nearest corresponding descending control signaling；
Or the precoding information in above-mentioned configuration information carries out precoding；Or, UE is by measuring the use in downlink reference signal
Down channel is obtained in the reference signal (CSI-RS) and/or the proprietary reference signal of cell (CRS) of channel condition information, and
Up channel is predicted by channel reciprocity, the up channel progress singular value decomposition left singular matrix is obtained into, right unusual
Matrix and diagonal matrix, select the column vector corresponding to the singular value of maximum as pre-coding matrix pair from right singular matrix
SRS carries out precoding.
In this example, above-mentioned descending control signaling equally can be format 4 or format 2B or format 2C.
Embodiment 3
In this example, base station is used to trigger user terminal transmission SRS, and issues the above-mentioned measurement ginseng of transmission to user terminal
Examine the configuration information of signal；Above-mentioned configuration information includes following one or more configured informations：The precoding of measuring reference signals
Enable instruction, the precoding information of measuring reference signals, the transmission times of measuring reference signals.
As shown in figure 5, in figure, 401 be macro base station, and 402 be RRH0, and 403 be RRH1, in CoMP system, base station to
Family terminal issues the configuration information for sending measuring reference signals, wherein, allocating pre-coding is enable.
User terminal sends the measuring reference signals that have passed through precoding according to the configuration information of acquisition to RRH0 and RRH1.
Macro base station compares the degree of strength for the measuring reference signals that RRH0 and RRH1 are received, and selection receives the strong RRH and user of signal
Terminal sets up descending or uplink link.
In this example, above-mentioned configuration information is that user terminal is handed down in base station by high-rise RRC signaling.
In this example, if to carry out precoding, the precoding letter according to entrained by inside above-mentioned descending control signaling
Cease (Precoding Matrix Index, PMI) and carry out precoding；Or according to last transmission or nearest corresponding descending control
The precoding information of signaling carries out precoding；Or the precoding information in above-mentioned configuration information carries out precoding；Or, UE
By measuring reference signal (CSI-RS) for channel condition information and/or the proprietary reference of cell in downlink reference signal
Signal (CRS) predicts up channel to obtain down channel by channel reciprocity, and the up channel is carried out into singular value
Decomposition obtains left singular matrix, right singular matrix and diagonal matrix, corresponding to the singular value that maximum is selected from right singular matrix
Column vector as pre-coding matrix to SRS carry out precoding.
In this example, above-mentioned descending control signaling is format 4 or format 2B or format 2C.
Embodiment 4
This example equally provides a kind of SRS sending method, wherein, the base station being related to, for triggering user terminal hair
Measuring reference signals are sent, and the configuration information for sending the measuring reference signals is issued to user terminal；Configuration information includes
Following one or more configured information：The precoding enable instruction of measuring reference signals, the precoding of measuring reference signals
Information, the transmission times of measuring reference signals.The user terminal being directed to, for the configuration information according to acquisition to base station
Send measuring reference signals.In this example, the precoding enable instruction of above-mentioned measuring reference signals indicates measurement with reference to letter
Number whether to carry out precoding.In this example, the precoding information of above-mentioned measuring reference signals, when indicating that SRS carries out precoding
The pre-coding matrix used.
When user terminal does not have data to need transmission, then the precoding for configuring measuring reference signals is not enabled；Work as user
When terminal has data to need transmission, then the precoding for configuring measuring reference signals is enabled.
In this example, above-mentioned configuration information is that user terminal is handed down in base station by high-rise RRC signaling.
In this example, if to carry out precoding, the precoding letter according to entrained by inside above-mentioned descending control signaling
Cease (Precoding Matrix Index, referred to as PMI) and carry out precoding；Or according under last transmission or recently corresponding
The precoding information of row control signaling carries out precoding；Or the precoding information in above-mentioned configuration information carries out precoding；
Or, UE is special by measuring reference signal (CSI-RS) for channel condition information and/or cell in downlink reference signal
Some reference signals (CRS) predict up channel to obtain down channel by channel reciprocity, and the up channel is entered
Row singular value decomposition obtains left singular matrix, right singular matrix and diagonal matrix, and the unusual of maximum is selected from right singular matrix
The corresponding column vector of value carries out precoding as pre-coding matrix to SRS.
In this example, above-mentioned descending control signaling is format 4 or format 2B or format 2C.
Fig. 6 is the structured flowchart of the transmission system of the measuring reference signals according to the embodiment of the present invention.As shown in fig. 6, should
System includes：Base station 60 and user terminal 62, wherein,
Above-mentioned base station 60, including：
First sending module 602, SRS configuration information is sent for being issued to user terminal, wherein, the configuration information bag
Include：Precoding enable instruction for indicating whether to carry out SRS precoding；
User terminal 62, including：
Receiving module 622, is connected with the first sending module 602, for receiving configuration information；
Precoding module 624, is connected with receiving module 622, right for when precoding enable instruction indicates to enable
The SRS to be sent carries out precoding；
Second sending module 626, is connected with precoding module 624, for sending the SRS after precoding to base station 60.
During concrete application, above-mentioned configuration information can include：The transmission time of SRS precoding information and/or SRS
Number information；
Then above-mentioned precoding module 624, is additionally operable to carry out precoding to the SRS to be sent according to encoder matrix information；With
And second sending module 626, it is additionally operable to send SRS (including SRS after precoding or not to base station 60 according to transmission times information
Carry out the SRS of precoding).
During concrete application, as shown in fig. 7, base station 60 can also include：Selecting module 604, mould is sent with second
Block 626 is connected, the signal intensity choosing for the SRS (including SRS after the precoding or SRS for not carrying out precoding) according to reception
Signal intensity most strong long distance wireless front end RRH is selected, transmissions links are set up with user terminal 62.
It should be noted that the preferred working method that each module correlation in above-mentioned base station or user terminal is combined specifically may be used
So that referring to the description of above method embodiment, here is omitted.
As can be seen from the above description, the present invention realizes following technique effect：
Using technical scheme, user terminal can be achieved and sends the SRS that have passed through precoding, related skill is solved
SRS resource how is further saved in art, SRS resource utilization rate is improved, to realize more effectively aperiodic transmission SRS and week
Phase sends SRS, more effectively supports the problems such as CoMP system is applied, and SRS resource is saved, so as to improve SRS user
Multiplexing capacity, while can realize RRH selection in Synergistic multi-point system again, can also realize that the dynamic with non-precoded SRS is cut
Change, it is ensured that channel estimation quality.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and constituted
Network on, alternatively, the program code that they can be can perform with computing device be realized, it is thus possible to they are stored
Performed in the storage device by computing device, and in some cases, can be shown to be performed different from order herein
The step of going out or describe, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or
Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (11)
1. a kind of measuring reference signals SRS sending method, it is characterised in that including：
Base station issues the configuration information for sending SRS to user terminal, wherein, the configuration information includes：For indicating to the SRS
Whether the precoding enable instruction of precoding is carried out；
The user terminal receives the configuration information；
Indicate that the user terminal prelists to the SRS to be sent when enabling in the precoding enable instruction
Code, and send the SRS after precoding to the base station；When the precoding enable instruction indicates not enable, to described
Base station sends the SRS for not carrying out precoding；
Wherein, when the base station determines that the user terminal needs the SRS sent for cycle SRS, the precoding makes
Energy configured information indicates not enable；When the base station determines that the user terminal needs the SRS sent to be aperiodic SRS
When, the precoding enable instruction indicates to enable；Or
When the base station determines that the user terminal does not have data to need transmission, the precoding enable instruction is indicated not
Enable；When the base station determines that the user terminal has data to need transmission, the precoding enable instruction indicates to make
Energy.
2. according to the method described in claim 1, it is characterised in that
The configuration information includes：The precoding information of the SRS；
The user terminal carries out precoding according to the precoding information to the SRS to be sent.
3. according to the method described in claim 1, it is characterised in that
The configuration information includes：The transmission times information of the SRS；
The user terminal sends the SRS according to the transmission times information to the base station.
4. according to the method described in claim 1, it is characterised in that also include：
The user terminal is triggered by high-level signaling or descending control signaling and sends SRS in the base station.
5. method according to claim 4, it is characterised in that when the precoding enable instruction indicates to enable,
The user terminal carries out precoding according to a pair of the in the following manner SRS to be sent：
Precoding information according to entrained by presently described descending control signaling carries out precoding；
Precoding is carried out according to the precoding information of last transmission or the nearest descending control signaling；
The user terminal by measure in downlink reference signal for channel condition information reference signal CSI-RS and/or
The proprietary reference signal CRS of cell predicts up channel to obtain down channel by channel reciprocity, by the up letter
Road carries out singular value decomposition and obtains left singular matrix, right singular matrix and diagonal matrix, is selected most from the right singular matrix
Column vector corresponding to big singular value is as pre-coding matrix to SRS progress precodings.
6. the method according to claim 4 or 5, it is characterised in that the descending control signaling is one below form：
format 4、format 2B、format 2C。
7. the method according to any one of claim 1 to 5, it is characterised in that also include：
The base station issues the configuration information to the user terminal by high-rise wireless heterogeneous networks RRC signaling.
8. the method according to any one of claim 1 to 5, it is characterised in that the user terminal is sent to the base station
After the SRS, in addition to：
The base station selects the signal intensity most strong long distance wireless front end RRH according to the SRS of reception signal intensity
Transmissions links are set up with the user terminal.
9. a kind of measuring reference signals SRS transmission system, including：Base station and user terminal, it is characterised in that
The base station, including：
First sending module, SRS configuration information is sent for being issued to the user terminal, wherein, the configuration information includes：
Precoding enable instruction for indicating whether to carry out the SRS precoding；
The user terminal, including：
Receiving module, for receiving the configuration information；
Precoding module, for when the precoding enable instruction indicates to enable, being carried out to the SRS to be sent pre-
Coding；
Second sending module, for sending the SRS after precoding to the base station, and in the precoding enable instruction
When instruction is not enabled, the SRS for not carrying out precoding is sent to the base station；
Wherein, when the base station determines that the user terminal needs the SRS sent for cycle SRS, the precoding makes
Energy configured information indicates not enable；When the base station determines that the user terminal needs the SRS sent to be aperiodic SRS
When, the precoding enable instruction indicates to enable；Or
When the base station determines that the user terminal does not have data to need transmission, the precoding enable instruction is indicated not
Enable；When the base station determines that the user terminal has data to need transmission, the precoding enable instruction indicates to make
Energy.
10. system according to claim 9, it is characterised in that
The configuration information includes：The transmission times information of the precoding information of the SRS and/or the SRS；
The precoding module, is additionally operable to carry out precoding to the SRS to be sent according to the precoding information；
Second sending module, is additionally operable to send the SRS to the base station according to the transmission times information.
11. the system according to claim 9 or 10, it is characterised in that the base station also includes：
Selecting module, the signal intensity for the SRS according to reception is selected before the signal intensity most strong long distance wireless
RRH is held, transmissions links are set up with the user terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110111822.3A CN102170330B (en) | 2011-04-29 | 2011-04-29 | The sending method and system of measuring reference signals |
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| CN201110111822.3A CN102170330B (en) | 2011-04-29 | 2011-04-29 | The sending method and system of measuring reference signals |
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