CN109428639A - Method and apparatus for determining channel state information - Google Patents

Method and apparatus for determining channel state information Download PDF

Info

Publication number
CN109428639A
CN109428639A CN201710736921.8A CN201710736921A CN109428639A CN 109428639 A CN109428639 A CN 109428639A CN 201710736921 A CN201710736921 A CN 201710736921A CN 109428639 A CN109428639 A CN 109428639A
Authority
CN
China
Prior art keywords
subchannel
csi
communication equipment
network equipment
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201710736921.8A
Other languages
Chinese (zh)
Other versions
CN109428639B (en
Inventor
孙欢
宋暖
李楠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Shanghai Bell Co Ltd
Original Assignee
Nokia Shanghai Bell Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Shanghai Bell Co Ltd filed Critical Nokia Shanghai Bell Co Ltd
Priority to CN201710736921.8A priority Critical patent/CN109428639B/en
Priority to PCT/CN2018/101789 priority patent/WO2019037745A1/en
Publication of CN109428639A publication Critical patent/CN109428639A/en
Application granted granted Critical
Publication of CN109428639B publication Critical patent/CN109428639B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0675—Space-time coding characterised by the signaling
    • H04L1/0693—Partial feedback, e.g. partial channel state information [CSI]

Abstract

Embodiment of the disclosure provides the method, apparatus and computer program product for determining channel state information (CSI).A kind of method implemented at the communication equipment operated in a wireless communication system includes: to obtain the CSI of the channel between the communication equipment and the network equipment based on the signal from the network equipment, and wherein the channel includes the first subchannel and the second subchannel；Reference signal is sent to the network equipment, to indicate the information of the CSI about first subchannel；The CSI of CSI and second subchannel based on first subchannel, the information for the CSI about second subchannel that determination will be sent to the network equipment；And the information of the identified CSI about second subchannel is sent to the network equipment.Using embodiment of the disclosure, the CSI precision that network equipment side can obtain can be improved, and/or improve the capacity of uplink reference signals.

Description

Method and apparatus for determining channel state information
Technical field
The present disclosure relates generally to the technical fields of wireless communication, and more particularly to the nothing for being based on time division duplex (TDD) For determining the method, apparatus and computer program product of channel state information (CSI) in line communication system.
Background technique
The introduction of this section is intended to promote to better understand the disclosure.Therefore, the content of this section should based on this into Row is read, and is understood not to belonging in the prior art about which or which is not belonging to the prior art and recognizes.
In a wireless communication system, in order to support efficiently to send and receive, reduce interference etc., it is expected that sending side and connecing Receive the information that side obtains the CSI about communication channel.
In the 5th generation (5G) wireless communication system, also known as in new radio (NR) system, multiple antennas or have extensive The multi-panel of antenna is used in the transmitting-receiving point side (TRP) and user side.Using multiple antennas/multi-panel, TRP can be supported simultaneously To the multiple stream transmission of multiple users.In order to be effectively reduced multi-user interference by scheduling and/or precoding, needed in the side TRP Obtain the accurate downlink CSI for being directed to each user.
Summary of the invention
For different wireless communication systems, TRP can obtain the information of downlink channel by different modes.Example Such as, in time division duplex (TDD) system, TRP can utilize the reciprocity, logical between downlink channel and uplink channel Cross the information for measuring corresponding uplink channel and obtaining downlink channel.In frequency division duplex (FDD) system, TRP energy The information of downlink channel is enough obtained by the CSI feedback of each user.For being based on being based on CSI feedback in FDD system Scheme, since CSI will be quantized to save uplink overhead before feedback, TRP can not obtain pinpoint accuracy CSI.If TRP is transmitted and/or is dispatched for multi-user-multiple-input and multiple-output (MU-MIMO) using quantified CSI, can Serious multi-user interference can be generated, limits the performance of system significantly.Therefore, in 5G NR system, tdd mode has more High priority, because it can obtain higher CSI accuracy and therefore obtain better performance.However for TDD system For system, there are some actual factors, these factors will affect the precision of available CSI, and then influence such as downlink The performance of MU-MIMO.
In the disclosure, it proposes in TDD system for determining the new solution of CSI.Some embodiments can be used It is obtained in the CSI for for example improving the side TRP, and/or is used for reality by enhancing using part reciprocity and Limited Feedback The SRS capacity of TDD system.The additional letter for further enhancing proposed solution is additionally provided in other embodiments It enables.
It will be appreciated that though the communication scenes with reference to 5G NR describe some embodiments of the present disclosure, but the disclosure Embodiment is not limited to use in this scenario, but can be applied more broadly in there are any communication network of similar problems, System and scene.
When read in conjunction with the accompanying drawings, the middle other spies for understanding embodiment of the disclosure will be described below from various embodiments It seeks peace advantage, the principle of embodiment of the disclosure has been illustrated by way of example in attached drawing.
In a kind of implementing at the communication equipment operated in TDD wireless communication system in a first aspect, providing for the disclosure Method.This method comprises: obtaining the channel between communication equipment and the network equipment based on the signal from the network equipment CSI, wherein the channel includes the first subchannel and the second subchannel；Reference signal is sent to the network equipment, with instruction about the The information of the CSI of one subchannel；The CSI of CSI and the second subchannel based on the first subchannel, determination will be sent to the network equipment The CSI about the second subchannel information；And the letter of the identified CSI about the second subchannel is sent to the network equipment Breath.
In one embodiment, communication equipment can be obtained based on the CSI reference signal (CSI-RS) from the network equipment Obtain the CSI of channel.
In another embodiment, the first subchannel and the second subchannel can respectively with the antenna port of communication equipment One subset is associated with second subset.In a further embodiment, communication equipment can by with the associated day of the first subchannel First subset of line end mouth to send reference signal to the network equipment.
In some embodiments, communication equipment can by it is following operation determination will to the network equipment send about second The information of the CSI of subchannel: the CSI based on the first subchannel obtains the transmission covariance matrix of the first subchannel；Based on transmission Covariance matrix and common codebook for the second subchannel, determine the specific code book of communication equipment；It is set from identified communication The matched code word of CSI of selection and the second subchannel in standby specific code book；And be determined as the instruction of the code word will be to net The information for the CSI about the second subchannel that network equipment is sent.
In another embodiment, communication equipment can by it is following operation determination will to the network equipment send about second The information of the CSI of subchannel: the CSI of CSI and the second subchannel based on the first subchannel obtain the second subchannel and the first son Same phase matrix between channel；And believe what the instruction with phase matrix was determined as sending to the network equipment about the second son The information of the CSI in road.In a further embodiment, which may include: from the code for same phase matrix Select in this with the index of the matched code word of same phase matrix or the value with the element in phase matrix.
In another embodiment, the method for communication equipment can also include sending in following information to the network equipment The instruction of at least one: the CSI feedback ability of communication equipment；And the antenna configuration state of communication equipment.
In another embodiment, the method for communication equipment can further include: receiving from the network equipment will be by The instruction of the type for the CSI feedback that the communication equipment uses.
In the second aspect of the disclosure, provides and implement at a kind of network equipment operated in TDD wireless communication system Method.This method comprises: sending the letter for determining the CSI of the channel between communication equipment and the network equipment to communication equipment Number, wherein the channel includes the first subchannel and the second subchannel；Reference signal is received from communication equipment；Based on the received ginseng of institute Signal is examined, determines the CSI of the first subchannel；The information that the CSI about the second subchannel is received from communication equipment, wherein being connect CSI of the information based on the CSI of the first subchannel and the second subchannel of the CSI about second subchannel received；And base In the received CSI about the second subchannel information, determine the CSI of the second subchannel.
In one embodiment, receiving from communication equipment about the information of the CSI of the second subchannel may include for the The index of the code word of two subchannels, the code word come from the specific code book of communication equipment；And the network equipment can pass through following behaviour Make based on the received CSI about the second subchannel information, determine the CSI of the second subchannel: based on the first subchannel CSI obtains the transmission covariance matrix of the first subchannel；Based on transmission covariance matrix and for the public affairs of second subchannel Code book altogether, determines the specific code book of communication equipment；And it based on the received index of institute, determines and uses from identified code book In the code word of the second subchannel.
It in another embodiment, may include second from the information of the received CSI about the second subchannel of communication equipment The instruction of same phase matrix between subchannel and the first subchannel；And the network equipment can be by based on identified first son The CSI of channel and received same phase matrix the instruction, to obtain the CSI of second subchannel.
In another embodiment, the network equipment can also send the CSI to be used by communication equipment to the communication equipment The instruction of the type of feedback.
In another embodiment, the network equipment can also be from the finger of the CSI feedback ability of communication equipment receiving communication device Show and/or the instruction of the antenna configuration state of communication equipment.
In the third aspect of the disclosure, a kind of communication equipment operated in a wireless communication system is provided.The communication Equipment includes CSI obtaining unit, reference signal transmission unit, feedback information determination unit and feedback unit.Wherein CSI obtains single Member is configured as obtaining the CSI of the channel between communication equipment and the network equipment based on the signal from the network equipment.With reference to letter Number transmission unit is configured as sending reference signal to the network equipment, to indicate the CSI's about the first subchannel in channel Information.Feedback information determination unit is configured as the CSI of CSI and the second subchannel based on the first subchannel in channel, really Surely the information for the CSI about the second subchannel that sent to the network equipment, and feedback unit is configured as to the network equipment Information determined by sending about the CSI of the second subchannel.
In one embodiment, which can also optionally include instruction transmission unit and/or CSI type refers to Show receiving unit.Indicate transmission unit be configured as to the network equipment send communication equipment CSI feedback ability instruction and/or The instruction of the antenna configuration state of communication equipment, and be configured as receiving from the network equipment will be by for CSI type instruction receiving unit The instruction for the CSI feedback type that communication equipment uses.
In the fourth aspect of the disclosure, a kind of network equipment operated in a wireless communication system is provided.The network Equipment includes signal transmitting unit, reference signal receiving unit, the first CSI determination unit, CSI information receiving unit, Yi Ji Two CSI determination units.Wherein, signal transmitting unit is configured as sending to communication equipment for determining that communication equipment and network are set The signal of the CSI of channel between standby.The channel includes the first subchannel and the second subchannel.Reference signal receiving unit is matched It is set to from communication equipment and receives reference signal, and the first CSI determination unit is configured as based on the received reference signal of institute, Determine the CSI of the first subchannel.CSI information receiving unit is configured as receiving the CSI about the second subchannel from communication equipment Information, wherein the received CSI about the second subchannel information based on the CSI of the first subchannel and the second subchannel CSI.2nd CSI determination unit be configured as based on the received CSI about the second subchannel information, determine second son The CSI of channel.
At the 5th aspect of the disclosure, a kind of device is provided.The device includes processor and memory, the memory Comprising the instruction that can be performed by the processor, thus described device operation is first aspect, the second party executed in the disclosure Any one in method described in face.
At the 6th aspect of the disclosure, a kind of computer program product is provided comprising instruction, when the instruction is at one Or it is performed on multiple processors so that the one or more processors execute the first aspect and second party according to the disclosure Method either described in face.
In the 7th aspect of the disclosure, a kind of computer-readable storage for being embodied with computer program product thereon is provided Medium.Computer program product includes instruction, when instruction is performed on at least one processor, so that at this at least one Device is managed to execute according to method either in the first aspect and second aspect of the disclosure.
Detailed description of the invention
According to the described in detail below of reference attached drawing, above and other aspects of the various embodiments of the disclosure, feature and Benefit will be apparent.The same reference numbers in the drawings refer to identical or equivalent elements.Attached drawing is only used for promotion pair Embodiment of the disclosure is best understood from, and is not drawn necessarily to scale, in the accompanying drawings:
Fig. 1 is shown in which that the example communication network of embodiment of the disclosure may be implemented；
The channel between the network equipment and communication equipment is obtained Fig. 2 schematically shows the measurement based on reference signal The example of CSI；
Fig. 3 shows the simplification system model according to some embodiments of the present disclosure；
Fig. 4 A-4C is shown to be implemented at the communication equipment according to an embodiment of the present disclosure operated in a wireless communication system Method example flow diagram；
Fig. 5 schematically shows the comparison of common codebook and the specific code book of communication equipment；
Fig. 6 A-6B show carried out between communication equipment and the network equipment in accordance with an embodiment of the present disclosure for obtaining The instantiation procedure of the CSI of channel；
Fig. 7 A-7C is shown to be implemented at the network equipment according to an embodiment of the present disclosure operated in a wireless communication system Method example flow diagram；
Fig. 8 shows the simplified block diagram of device according to an embodiment of the present disclosure；And
Fig. 9-Figure 10 shows exemplary scenario according to an embodiment of the present disclosure compared with the performance of prior art.
Specific embodiment
Hereinafter, reference illustrative examples are described to the principle and spirit of the disclosure.It should be appreciated that all these realities Applying example is only so that those skilled in the art is more fully understood and is further implemented the disclosure and provide, rather than be used to limit this public affairs The range opened.For example, the feature that a part as one embodiment shows or describes can make together with another embodiment To generate another embodiment.For the sake of clarity, some features of the practical realization described in the present specification can be by It omits.
It is described to the reference instruction of " one embodiment ", " embodiment ", " example embodiment " etc. in specification to implement Example may include a particular feature, structure, or characteristic, but need not each embodiment include a particular feature, structure, or characteristic. In addition, such phrase is not necessarily referring to identical embodiment.In addition, special characteristic, structure or spy ought be described in conjunction with the embodiments When property, it is believed that realize that such feature, structure or characteristic are the knowledge models in those skilled in the art in conjunction with other embodiments In enclosing, regardless of whether being explicitly described.
It will be appreciated that though term " first " and " second " etc. can be used for describing various elements herein, but this A little elements should not be limited by these terms.These terms are only used to distinguish an element with another element.For example, In the case where the range for not departing from example embodiment, first element can be referred to as second element, and similarly, second element First element can be referred to as.As used herein term "and/or" includes one or more associated entries listed Any and all combinations.
Term as used herein is used only for the purpose of describing specific embodiments, and is not intended to be limited to example embodiment. As used herein singular " one ", "one" and "the" are intended to also include plural form, clear unless the context otherwise Instruction.It will also be understood that as used herein, the terms "include", "comprise", " having ", specified this feature, element and/group The presence of part etc., but the presence or addition for being not excluded for one or more of the other feature, element, component and/or combination thereof.Term " optional " expression described embodiment or realization are not enforceable, can be omitted in some cases.
Generally, terms used herein have identical as being generally understood for disclosure those of ordinary skill in the art Meaning, unless otherwise expressly defined.
As it is used herein, term " communication network ", which refers to, follows any suitable communication standard (such as NR, long term evolution (LTE), LTE advanced (LTE-A), wideband code division multiple access WCDMA), high-speed packet access (HSPA), CDMA2000, time division synchronous CDMA (TD-CDMA) etc.) network.Furthermore, it is possible to be executed in communication network according to any suitable communication protocol Communication between equipment, communication protocol include but are not limited to global system for mobile communications (GSM), Universal Mobile Communication System (UMTS), long term evolution (LTE), and/or other suitable communication protocols, such as first generation (1G), the second generation (2G), 2.5G, 2.75G, 3G, 4G, 4.5G, 5G communication protocol, WLAN (WLAN) standard (such as 802.11 standard of IEEE)；And/or Any other wireless communication standard appropriate, and/or any other is currently known or the following agreement by exploitation.
As it is used herein, term " network equipment " refer in communication network terminal device via its access network and from It receives the equipment of service.According to the term and technology used, the network equipment can refer to base station (BS), access point (AP) etc..? In some embodiments, " network equipment " can also refer to the end of repeater or (part) function with base station or repeater End equipment.
Term " communication equipment " refers to any equipment with communication capacity.As an example, not a limit, communication equipment can With the terminal device that is otherwise known as, user equipment (UE), subscriber station (SS), portable subscriber station, movement station (MS) or access terminal (AT).Communication equipment can include but is not limited to mobile phone, cellular phone, smart phone, ip voice (VoIP) phone, plate Computer, wearable terminal equipment, personal digital assistant (PDA), portable computer, desktop computer, such as digital camera Image capture terminal device, gaming terminal device, music storage and playback reproducer, vehicle-mounted wireless terminal device, wireless endpoint, Mobile station, embedded device on knee (LEE), installation equipment (LME) on knee, USB softdog, smart machine, wireless client Premises equipment (CPE), D2D equipment, machine to machine (M2M) equipment, V2X equipment etc..In the following description, term " communication Equipment ", " terminal device ", " terminal ", " user equipment " and " UE " may be used interchangeably.
The signal that can be implemented within the example wireless communication system 100 of embodiment of the disclosure is shown in FIG. 1 Figure.Wireless communication system 100 may include one or more network equipment 101.For example, in this example, the network equipment 101 can be presented as base station, for example, gNB.It should be understood that the network equipment 101 can also be presented as other forms, example Such as NB, eNB, BTS, BS or BSS, repeater etc..The network equipment 101 is that multiple communications within its coverage area are set Standby 111-1,111-2 (hereafter referred to collectively as communication equipment 111) provides wireless connection.Communication equipment 111 can be via wireless transmission Channel 131 or 132 is communicated with the network equipment 101.Wherein, downlink refers to from the network equipment 101 to communication equipment 111 Communication link, and uplink refers in opposite direction from communication equipment 111 to the communication link of the network equipment 101.It will be appreciated that , the arrangement in figure is only example, the wireless communication system 100 also may include more or less communication equipment or The network equipment.
The wireless communication system 100 can be the communication system based on TDD, that is, uplink and downlink can be with works Make in identical frequency band, distinguished by the different time.For example, a radio frame for communication may include 10 sons Frame, and some of which subframe for uplink and other subframes are used for downlink.
As previously mentioned, in a tdd system, the network equipment 101 can be by measuring under corresponding uplink channel, utilization Reciprocity between Downlink channels and uplink channel obtains the information about downlink channel.Similarly, communication is set Standby 111 can also obtain the information of uplink channel by measuring downlink channel.It is schematically shown in Fig. 2 Measurement based on reference signal (RS) obtains the example of the CSI of the channel between the network equipment 101 and communication equipment 111.
As shown in Fig. 2, being respectively equipped with mutiple antennas 201 and 202 in the network equipment 101 and 111 two sides of communication equipment.It is logical Letter equipment 111 can measure the CSI-RS from the network equipment and know/determine the CSI of downlink channel (for example, channel The value of matrix).Theoretically, based on the channel reciprocity of TDD, in ideal conditions, communication equipment 111 can will be obtained The downlink channel CSI be used as uplink channel CSI.Similarly, the network equipment 101 can be measured sets from communication Standby 111 detection reference signal (SRS) and the CSI for determining uplink channel, and according to channel reciprocity by the uplink The CSI of channel is used for the scheduling and transmission of downlink.
However, due to some actual factors, sending survey in actual TDD system and being difficult to obtain based on channel reciprocity Whole CSI required for obtaining.These actual factors will affect the performance of downlink MU-MIMO.It is exemplified below two mainly Factor as example.
One is SRS capacity limit.In the wireless communication system of such as NR, multiple antennas is can be used to TRP in user side It sends and is received from TRP.If TRP goes for the complete CSI between each UE and TRP, need to configure more SRS resource is measured for uplink channel.Theoretically, in the case where SRS resource is unrestricted, TRP can be obtained ideally The channel information of all users.However in practice, the SRS resource of each cell is limited, and this will limit SRS resource Distribution between candidate user.In addition, multi-subscriber dispatching gain is also limited.If TRP goes for each user's The complete CSI of channel will expend long time and be used for SRS measurement, this causes to survey in more early time slot (or subframe) The partial channel knowledge of amount is out-of-date.For more TRP transmission, the program will face more challenges.
Secondly can power limit for UE.In the system of such as NR, user side can be used multiple antennas to TRP send and from TRP is received.However the configuration of the antenna port of user side may be asymmetric for uplink and downlink.For example, UE Usually have receiving antenna ports more more than uplink transmission antenna port number for receiving down link signal, to obtain Diversity gain and merging gain.In this case, it is sent using only the subgroup of the antenna of user side for uplink, to increase The transmission power of strong every mobile radio.However, this will destroy the uplink in TDD system and the reciprocity between downlink Characteristic, because receiving side cannot be known/be determined the complete CSI of downlink channel based on the measurement to uplink signal. Such case is otherwise known as the part reciprocity of TDD channel herein.
The actual factor of the above (and some other factors) will lead to downlink channel and uplink channel Between part reciprocity, and then deteriorate NR TDD MU-MIMO performance.In view of the above problems, in third generation affiliate The solution proposed in (3GPP) radio access network 1 (RAN1) working group includes: 1) part SRS sends and passes through public affairs The part CSI quantization that code book carries out altogether；2) part SRS is sent and antenna sets switch；And 3) codebook quantification.For solution 1), due to having used common codebook, the error of part CSI quantization is big.Therefore the feedback of quantization cannot reflect practical letter well Road information.For solution 2), the side TRP needs the more time to obtain complete channel matrix.Therefore, scene is being sent When changing fast, risk when CSI measurement part is already expired previous is deposited.And solution 3) it is used for single user transmission.For Multiuser transmission, the program 3) it will lead to more multi-user interferences, and deteriorate the performance of multiuser transmission.
In order to for example improve the SRS capacity in the CSI precision of the side TRP acquisition, and/or raising cell, in the disclosure In new solution for obtaining/determining CSI is proposed in the case where considering the practical limitation of TDD system.It is some Embodiment can be with such as (but not limited to) uses in the first stage of the NR system of 3GPP, and some embodiments can be used for example The such as (but not limited to) second stage of the NR system with low complex degree.It additionally provides in some embodiments for further enhancing The additional signaling of the solution proposed.
The basic thought of one embodiment of the disclosure is improved using the part reciprocity of channel and improved code book The capacity of precision and/or raising SRS that CSI is obtained.For whole uplink and downlink, there is only parts mutually Easy characteristic.However for some subchannels (such as channel between the transmission antenna subgroup of the side TRP and UE), still deposit In complete reciprocity.UE can measure the information for obtaining the local channel by CSI-RS, and TRP can pass through uplink SRS measurement in road obtains the information of the local channel.That is, the information of the local channel can for known to UE and TRP the two, This pellucidly establishes bridge between UE and TRP.The transmission covariance matrix of the local channel can be distinguished by UE and TRP It obtains.In one embodiment, which can be used for finely turning to common codebook into the specific code book of user, example Such as, which can be mapped to existing common codebook the subspace on the airspace of specific user channel.After update The specific code book of user there is high-resolution, and can be used to quantify the remaining downlink channel of user side.From The code word selected in the specific new code book of user is fed back to TRP.The side TRP can take same process to update common code This is to obtain the same specific code book of user.TRP selects code word then according to user feedback from the code book of update, and It is used as the remaining downlink channel that can not be obtained by uplink SRS measurement.To pass through merga pass SRS measurement obtain first part CSI and UE feedback second part CSI, TRP can restore for every user it is complete under Downlink channel information.
The basic thought of another embodiment of the disclosure is mentioned using the part reciprocity of channel and the correlation of channel The capacity of precision and/or raising SRS that high CSI is obtained.As described above, although coming for whole uplink and downlink It says, there is only part reciprocity properties, however for some subchannels, however it remains complete reciprocity.Therefore, it can incite somebody to action Channel between sending side and receiving side is divided into two parts.The first part of downlink channel has corresponding uplink Channel, therefore the local channel as known to being the side UE and TRP with complete reciprocity (such as passing through measurement).And downlink The second part of link can not have corresponding uplink.In this embodiment, user can be based on such as downlink CSI-RS measurement feeds back this with phase matrix to calculate the same phase matrix between first part's channel and second part channel To TRP.TRP can be used (such as being measured by SRS) acquisition first part CSI and feedback same phase matrix come obtain/really Determine the CSI of second part downlink channel.It can be extensive by the second part CSI, TRP of combination first part CSI and acquisition Multiple complete user's downlink channel information.The embodiment can reduce significantly the computation complexity of user side, and keep away Exempt from the search process of optimal code word.
In addition, above embodiment does not need to obtain complete CSI by SRS, therefore, it is configured for every user's SRS resource can be reduced, to improve the capacity of SRS in cell.That is, more residue SRS resources can be used for Other candidate users, or other special transmission purposes, for example, for supporting the multi-user based on nonlinear precoding to send out It send.This helps to improve the overall performance of system.
The simplification system model according to some embodiments of the present disclosure is shown in FIG. 3.In the example system, TRP 310 and UE 320 is respectively equipped with mutiple antennas 301 and 302.UE 320 can be obtained by measuring the CSI-RS of downlink Obtain complete downlink channel status information H.Theoretically, TRP 310 can be by measuring uplink channel, utilizing channel Reciprocity and obtain downlink channel H.However, the limiting factor of some reality makes TRP 310 be difficult to obtain by measurement Complete channel.For example, user is received using mutiple antennas 302 for downlink, and it is used only the one of mutiple antennas 302 A subgroup 312 is sent for uplink.In this case, TRP 310 can only be obtained by measurement corresponds to antenna subset 312 channel.Therefore, in some embodiments of the present disclosure, complete downlink channel matrix H can be expressed as [H1； H2], wherein first part's channel H1 can measuring by reference to signal 330 (such as uplink SRS) in 310 side TRP It arrives, and second part channel H2 can be restored by other means by TRP 310.
Information in Fig. 3, by the feedback 340 of low complex degree to TRP offer about H2.Restore subchannel with high precision Matrix H 2 becomes the key for obtaining accurate complete downlink channel matrix.In some embodiments, believe to enhance user The resolution ratio of road quantization based on common codebook and utilizes part reciprocity, determines the specific code book of user for channel H2's Quantization.And the side TRP can take operation identical with user side, realize that the CSI of pinpoint accuracy restores.In other embodiments In, the feedback quantity of H2 can be reduced based on the correlation of channel matrix and/or improves the precision of CSI.
Described below in conjunction with attached drawing 4A it is according to one embodiment of the disclosure, operate in TDD wireless communication system Communication equipment at implement method 400.The wireless communication system is, for example, the communication system 100 in Fig. 1, and the communication is set It is standby to can be communication equipment 320 shown in communication equipment 111 shown in (such as, but not limited to) Fig. 1 or Fig. 3.In order to Convenient for discussing, method 400 is described below with reference to network environment 100 described in communication equipment 111 and Fig. 1.
As shown in Figure 4 A, in block 410, communication equipment 111 obtains itself and the net based on the signal from the network equipment 101 The CSI of channel between network equipment 101.The channel includes the first subchannel and the second subchannel.Such as the channel can indicate For H=[H1；H2].Therefore, in block 410, communication equipment obtains the first subchannel H1 and the second subchannel H2.
In one embodiment, in block 410, communication equipment 111 can based on the CSI-RS from the network equipment 101 come Obtain channel H.Embodiment of the disclosure is not limited to divide the first subchannel H1 and the second subchannel H2 in any particular manner. Only as an example, the first subchannel H1 and the second subchannel H2 can respectively with the antenna port of communication equipment 111 first Subset A1 is associated with second subset A2.In one embodiment, A1 and A2 are configurable.For example, A1 can be configured as packet Include the antenna port 1 and 2 in four antenna ports of communication equipment, and A2 can be configured as including communication equipment this four Antenna port 3 and 4 in a antenna port.In another embodiment, it may include 1 antenna port in A1, and can be in A2 Comprising 3 antenna ports or on the contrary.In another embodiment, the first subchannel H1 and the second subchannel H2 can distinguish Polarization direction associations different from the antenna of communication equipment 111.
In block 420, communication equipment 111 sends reference signal to the network equipment 101, to indicate about first subchannel CSI information.This enables the network equipment 101 to believe by measurement uplink reference signals and using uplink Reciprocity between road and downlink channel obtains sub-channel matrix H1.It means that sub-channel matrix H1 be thus UE and Known to TRP the two.
In one embodiment, which can be SRS, however embodiment of the disclosure is without being limited thereto.For example, In another embodiment, which can be demodulated reference signal (DMRS).In one embodiment, communication equipment 111 can To send the reference signal to the network equipment 101 with the associated first subset A1 of the first subchannel H1 by antenna port.
As shown in Figure 4 A, in block 430, CSI H1 and of the communication equipment 111 based on the first subchannel obtained in block 410 The CSI H2 of two subchannels, the information for the CSI about second subchannel that determination will be sent to the network equipment 101.Communication is set Standby 111 can the CSI about H2 to be sent of determination in several ways information.Only exist in example in figs. 4 b and 4 c rather than The purpose of limitation shows several embodiments of block 430.
In the example of Fig. 4 B, in block 431, communication equipment 111 can obtain the first son letter based on the CSI of the first subchannel The transmission covariance matrix in road.For example, communication equipment 111 can determine the transmission covariance square of the first subchannel by formula (1) Battle array R:
Wherein, ()HIndicate to take the operation of conjugation, f indicates sub-carrier indices, and wherein it is assumed that covariance matrix R complete Portion NfIt is obtained in a sub-carrier channels.
In another embodiment, communication equipment 111 can future automatic network equipment the signal bandwidth (i.e. NfHeight Carrier wave) it is divided into multiple subbands, and obtain the transmission association side of the first subchannel respectively for each subband in multiple subband Poor matrix more accurately sends covariance matrix for each subband to obtain.
In block 432, communication equipment 111 can be based on transmission covariance matrix R and for the common code of the second subchannel H2 This, determines the specific code book of communication equipment 111.
In existing NR system, the codebook quantification that channel matrix can be predefined, however TRP and all users Use predefined common codebook.That is, each user quantifies its channel using same code book, and the index of code word is fed back To TRP.It is indexed using the feedback and the code book, TRP can restore subscriber channel matrix.In NR system, TRP and UE have There is mutiple antennas, this makes channel matrix dimension very big；Meanwhile in order to reduce uplink feedback expense, codebook size is that have Limit.In addition, current code book is the common codebook for all users and TRP.In this case, which is expanded Open up all spaces onto airspace, this cause the common codebook on airspace on stator space have low resolution.
Unlike existing codebook quantification method, the operation of block 432 can pass through the portion using common codebook and channel Divide reciprocity, obtains the specific code book of communication equipment 111, common codebook is restricted to smaller subspace, to enhance user The resolution ratio of channel quantitative.By taking operation identical with user side, TRP can also obtain the specific code of communication equipment 111 This, the recovery for CSI.
As an example, not a limit, in block 432, communication equipment 111 can obtain communication equipment 111 by following formula (2) Specific code book:
Wherein wiIndicate i-th of code word in common codebook, L indicates that the code word in common codebook is total, described in R expression Covariance matrix is sent, | | | |FIndicate to take the operation of F norm, and ciIn the specific code book of communication equipment 111 determined by indicating I-th of code word.
The comparison of common codebook and the specific code book of communication equipment 111 is schematically shown in Fig. 5.Show on the left of Fig. 5 Code word w in common codebook outiDistribution in space, and as seen from the figure, which expands to entire space, thus resolution ratio It is lower.The code word of the common codebook can be mapped to the subspace on the airspace of the subscriber channel shown on the right side of Fig. 5, to obtain The specific code book of user.By the right side Fig. 5 as it can be seen that being collected by the specific code book of communication equipment 111 that the operation of block 432 obtains In in the specific subspace of communication equipment 111.Since the code book of an equal amount of fining be used to quantify space subspace, this Mean code word ciThe channel information in the particular subspace can be indicated with higher resolution ratio.Although only with example in Fig. 5 Mode show the transformation for the code book that size is 8, it should be appreciated that similarly extended operation in block 432 is suitable for more Big codebook size.
Fig. 4 B is now returned to, in block 433, communication equipment 111 can be selected from the specific code book of identified communication equipment Select the matched code word of CSI H2 with the second subchannel；And being determined as the instruction of the code word in block 434 will be to the network equipment The information of 101 CSI about the second subchannel sent.
Fig. 4 C shows another example embodiment 430 ' of block 430.In this example, in block 435, communication equipment 111 Based on the first subchannel H1 and the second subchannel H2 obtained in block 410, the second subchannel and the first subchannel are obtained Between same phase matrix；In block 436, which can be determined as by communication equipment 111 will be to the network equipment The information of 101 CSI about the second subchannel sent.In the embodiment, communication equipment 111 utilizes subchannel H1 and son Correlation between channel H1 and subchannel H2 determines the feedback information for being used for subchannel H2, so as to reduce feedback quantity simultaneously And/or person improves feedback accuracy.
As an example, this can be expressed as followsin with phase matrix G:
Wherein operatePseudoinverse is sought in expression Operation.In another embodiment, the same phase matrix between H1 and H2 can also be obtained by other suitable algorithms and operation.
The instruction of the same phase matrix to be sent determined in block 436 can include but is not limited to: from this is used for phase square Selected in the code book of battle array with the index with the matched code word of phase matrix G, alternatively, the value with the element in phase matrix G.It is logical The size for crossing matrix G known to formula (3) will be less than the number of the antenna of user side.It means that about the second subchannel The feedback quantity of the information of CSI is relatively small.
Such as (but not limited to) determined in a manner of Fig. 4 B or Fig. 4 C to be sent to the network equipment 101 about the After the information of the CSI of two subchannels, in block 440, communication equipment 111 sends identified about second to the network equipment 101 The information of the CSI of subchannel, as shown in Figure 4 A.The information enable the network equipment combine obtained by reference to signal measurement Subchannel H1 obtain the CSI of complete channel H.
It shows and is in accordance with an embodiment of the present disclosure carried out between communication equipment 111 and the network equipment 101 in fig. 6 For obtaining the instantiation procedure 610 of the CSI of channel H.
The example of Fig. 6 A is associated with the embodiment of Fig. 4 B.The exemplary key point is the transmission covariance square of channel H1 Battle array R can get in the network equipment 101 and 111 side of communication equipment.Therefore, local channel reciprocity, the covariance matrix are utilized The public information being considered between the network equipment 101 and given communication equipment 111.If communication equipment 111 notifies net Network equipment 101 its will use the specific code book of user or TRP notice UE be passed through using the specific code book of user or the two Scheduled configuration is known together, then the network equipment 101 can take movement same as communication equipment 111 public to update Code book is to obtain the specific code book of same communication equipment 111.To be indexed using the feedback from communication equipment 111, network Equipment 101 can be restored pass through (due to limiting such as SRS capacity limit or UE uplink transmitting capacity) The local channel matrix that uplink SRS measurement obtains.
As shown in Figure 6A, downlink CSI-RS of 111 receptions of the communication equipment/measurement (611) from the network equipment 101, The complete downlink channel matrix H of estimation/acquisition (612), and user sends configuration for channel square according to its uplink Battle array is divided into two parts [H1；H2].Then, communication equipment 111 is based on H1 and H2, true for example, by embodiment shown in Fig. 4 B Fixed (613) will be sent to the information about subchannel H2 of the network equipment 101.Reference signal (such as SRS) for H1 measurement And the information about H2 sends (614) to the network equipment 101 by uplink by communication equipment 111.In one embodiment In, communication equipment 111 sends SRS by antenna subset associated by subchannel H1, in order to which the network equipment 101 passes through survey It measures SRS and obtains subchannel H1, and the index of the channel H2 based on the specific code book C quantization of user is fed back to the network equipment 101.It should be noted that SRS and the information about H2 were not necessarily sent simultaneously.For example, the transmission of SRS can be early In the transmission of the information about H2.
The network equipment 101 obtains (615) H1 by measuring uplink SRS, and updates common code using the H1 This, with the specific code book C of acquisition (616) user same as 111 side of communication equipment.In addition, based on from communication equipment 111 The feedback of code word corresponding with H2 indexes, and the network equipment 101 can find corresponding code word from the specific code book C of user, make Restore (617) subchannel H2 with the correspondence code word.By combining H1 and H2, the network equipment 101 can obtain complete channel square The CSI of battle array H.The CSI of channel H obtained can be used for multi-subscriber dispatching, and/or be used for downlink send with Encoder design is with pre-stamped multi-user interference.
By above procedure as it can be seen that covariance matrix R can be obtained by local channel reciprocity, and communication equipment 111 is not It needs to feed back the transmission covariance matrix R to the network equipment 101 and realizes that same common codebook updates.This protects feedback quantity It holds in lower level.
It should be noted that each communication equipment should be independently in the case where there are multiple communication equipments in a communications system It calculates and sends covariance matrix R, update common codebook obtains its specific code book C and quantifies remaining subchannel.And in network 101 side of equipment should independently execute operation shown in Fig. 6 A for different communication equipment.
Another instantiation procedure 620 according to an embodiment of the present disclosure is shown in fig. 6b.The method of the example and Fig. 4 C Association, that is, the CSI of H2 is obtained using the phase relation between H1 and H2.The phase relation can be shown as between H1 and H2 Same phase matrix, and this with phase matrix can (such as in an explicit way) be fed back to the network equipment 101.The network equipment Then 101 obtain H2 with phase matrix and the H1 of (such as passing through SRS) measurement using this.The example can reduce logical significantly Believe the computation complexity of equipment side and the operation complexity that network side restores for the channel of particular communication devices.The program is for example It can be used in NR stage II in 3 gpp.
As shown in Figure 6B, communication equipment 111 receives (621) downlink transmission (such as CSI-RS), passes through downlink CSI-RS measurement obtains complete downlink channel matrix H.The channel matrix can be divided into two parts [H1；H2].It is logical Believe that equipment 111 for example can determine the same phase matrix G of (622) between H1 and H2 by mode described in previously described formula (3).The same phase The instruction (such as index of corresponding code word) of matrix G and the reference signal for measuring subchannel H1 are sent (623) to network Equipment 101.Based on the reference signal from communication equipment 111, the network equipment 101 can determine (624) H1, and based on H1 and The instruction of received G obtains (625) H2.In the case where G is defined shown in such as formula (3), the network equipment can pass through following formula (4) H2 is obtained:
H2=GH1 (4)
Wherein G is the specific same phase matrix of user that communication equipment 111 is fed back.It is more smart that above procedure obtains the network equipment True H1 and H2, and enable the network equipment 101 to pass through combination/Cascade H 1 and H2 to obtain the channel completely estimated Matrix H=[H1；H2].H obtained can be used for by the network equipment such as (but not limited to) multi-subscriber dispatching and downlink Precoder design is sent, to suppress inter-user interference.
As discussed above, in the example of 6 b it, the network equipment 101 can be arrived by explicitly feedback with phase matrix G, with G, which is directly based upon, convenient for the network equipment 101 obtains sub-channel matrix H2.It is multiple that it reduce the operations of both user side and network side Miscellaneous degree.In addition, the size due to G is smaller, uplink overhead is also in control.In some embodiments, communication equipment The index of the corresponding code word of G matrix can be sent to the network equipment by 111, be set alternatively, the element in G matrix is sent to network It is standby.
In addition, by above embodiments as it can be seen that communication equipment 111 and the network equipment 101 have the CSI method of determination used There is common understanding.That is, the network equipment 101 can determine the feedback content of communication equipment 111, and correctly use The feedback content determines H2.In some embodiments, the content of CSI feedback, type and/or format can be predetermined, To which the network equipment 101 can determine the feedback content of communication equipment 111.
In further embodiments, it is alternatively possible to introduce new signaling, so that the operation and communication of the network equipment 101 The operation of equipment 111 is consistent/synchronous, obtains efficient multi-user downlink and sends.For example, communication equipment 111 can be from net The reception of network equipment 101 will be by the instruction for the CSI feedback type that the communication equipment 111 uses, as shown in the block 450 in Fig. 4 A.Make For example, which may include two bit XY to indicate to obtain for different user or the CSI of different user groups Scheme.The value of XY and the example of corresponding meaning are shown in following table 1.In another embodiment, 1 bit can also be used To indicate that CSI obtains scheme.
The instruction of table 1.CSI scheme
Alternatively, or additionally, in another embodiment, communication equipment 111 can be with, block 460 in Figure 4 A, to net Network equipment 101 sends the instruction of its CSI feedback ability, such as indicates for example whether the communication equipment 111 supports Fig. 4 B or 4C Shown in feedback scheme.And alternatively, communication equipment 111 can also send its antenna configuration to the network equipment 101 in block 460 The instruction of state, so that the network equipment determines that the CSI that can be used obtains scheme.
Fig. 7 A shows real at the network equipment that is according to an embodiment of the present disclosure, operating in TDD wireless communication system The flow chart for the method 700 applied.The wireless communication system can be, such as, but not limited to, the system 100 in Fig. 1, and the net Network equipment can be, for example, the network equipment 101 in Fig. 1 or the network equipment in Fig. 3 310.For the ease of discussing, below Network environment 100 referring to the network equipment 101 and Fig. 1 is described into method 700.
As shown in Figure 7 A, in block 710, the network equipment 101 is sent to communication equipment 111 for determining 111 He of communication equipment The signal of the CSI of channel between the network equipment 101.The channel includes the first subchannel and the second subchannel.Implement at one In example, the network equipment 101 may include (but being not limited to) CSI-RS in the signal that block 710 is sent.In another embodiment, the letter Number it is also possible to such as DMRS, CRS, location reference signals (PRS) or data-signal.
As an example, first subchannel and the second subchannel can respectively with the antenna port of communication equipment 111 One subset is associated with second subset, alternatively, the not same polarization side with the antenna of communication equipment 111 is associated with.However the reality of the disclosure It applies example and is not limited to any specific subchannel division mode.
In block 720, the network equipment 101 receives reference signal from communication equipment 111, and in block 730, it is received to be based on institute Reference signal determines the CSI of first subchannel.
In an example embodiment, it is come from from the received reference signal of communication equipment 111 associated with the first subchannel First subset of antenna port.Alternatively, or additionally, which may be, but not limited to, uplink SRS.
In block 740, the network equipment 101 receives the information of the CSI about the second subchannel from communication equipment 111.About CSI of the information of the CSI of two subchannels based on the CSI of the first subchannel and the second subchannel.
In one embodiment, the network equipment 101 is logical in the information of the received CSI about the second subchannel of block 740 Believe that equipment 111 is determined based on method 400 in block 430 and in the transmission of block 440.Therefore, in conjunction with described in method 400 about The description of the information of the CSI of second subchannel is equally applicable herein.
In block 750, the network equipment 101 based on the received CSI about the second subchannel information, determine second son The CSI of channel.Depending on the received CSI about the second subchannel information different form, the network equipment 101 can be with Different operations is taken to determine the CSI of the second subchannel.The different embodiment 750- of block 750 are shown respectively in Fig. 7 B and 7C 1 and 750-2.
For example, the information of the CSI about the second subchannel can be the second subchannel H2 through the specific code of communication equipment 111 Codewords indexes after this quantization.In this example, the network equipment 101 can by execute shown in Fig. 7 B operation 751-753 come Determine H2.
As shown in Figure 7 B, in block 751, the network equipment 101 obtains the first subchannel based on the CSI H1 of the first subchannel Send covariance matrix R.For example, R can be obtained by formula (1) above.In one embodiment, the network equipment 101 can be with The bandwidth of the signal sent to communication equipment 111 is divided into multiple subbands, and for each subband point in multiple subband The transmission covariance matrix of the first subchannel is not obtained.
In block 752, transmission covariance matrix R of the network equipment 101 based on acquisition and for the common code of the second subchannel This, determines the specific code book C of communication equipment 111.Code book C can for example be determined by formula above (2).
In block 753, the network equipment 101 based on received H2 codewords indexes, determination is used for from identified code book C Code word of second subchannel H2, so that it is determined that H2.
In another example, the network equipment 101 can be in the information of the received CSI about the second subchannel of block 740 The instruction of same phase matrix G between second subchannel and the first subchannel.Instruction with phase matrix G can be, for example, from being used for With selected in the code book of phase matrix with the index with the matched code word of phase matrix or this with the element in phase matrix G Value.In this example, the network equipment 101 can determine H2 by executing operation 754 shown in Fig. 7 C.As seen in figure 7 c, exist Block 754, the network equipment 101 based on identified first subchannel CSI H1 and institute received same phase matrix G instruction, acquisition The second subchannel H2.For example, the network equipment 101 can determine H2 by previously described formula (4).
In some embodiments, method 700 can optionally include the operation of block 760, and wherein the network equipment 101 is to communication The transmission of equipment 111 will be by the instruction for the CSI feedback type that the communication equipment 111 uses.For example, the network equipment 101 can be to logical Letter equipment 111 sends the instruction of 2 bits shown in 1 bit or table 1 to indicate that CSI to be used obtains scheme.This refers to Example can such as be carried by new downlink control signaling, either by radio resource control (RRC) signaling or Media access control (MAC) control unit (CE) transmits.If system or network stabilization.Pass through RRC or meeting MAC Transmission can reduce overhead.
Alternatively or additionally, method 700 can optionally include the operation of block 770, and wherein the network equipment 101 is from logical Believe that equipment 111 receives the instruction of the ability of the CSI feedback of the communication equipment 111.In another embodiment, the network equipment 101 can To receive the instruction of the antenna configuration state of the communication equipment 111 from communication equipment 111.These instructions can help the network equipment Determine the feedback content of communication equipment 111.
Embodiment of the disclosure has many advantages, such as.For example, some embodiments can improve the precision of CSI acquisition, reduce Feedback overhead, and/or the capacity for improving SRS.
An aspect of this disclosure also provides the communication in cordless communication network (for example, communication network 100 shown in FIG. 1) Equipment.The communication equipment can be, for example, communication equipment shown in FIG. 1 111.
In one embodiment, communication equipment includes CSI obtaining unit, and reference signal transmission unit, feedback information determine Unit and feedback unit.Wherein CSI obtaining unit is configured as obtaining communication equipment and net based on the signal from the network equipment The CSI of channel between network equipment.Reference signal transmission unit is configured as sending reference signal to the network equipment, to indicate to close The information of the CSI of the first subchannel in channel.Feedback information determination unit is configured as based on the first son letter in channel The CSI of the CSI in road and the second subchannel, the information for the CSI about the second subchannel that determination will be sent to the network equipment, and Feedback unit is configured as sending the information of the identified CSI about the second subchannel to the network equipment.
In one embodiment, which can execute the method 400 in conjunction with described in Fig. 4 A-4C, therefore combination side Content described in method 400 is equally applicable herein, and repeats no more.
In another embodiment, which can also optionally include instruction transmission unit and/or CSI type refers to Show receiving unit.Indicate transmission unit be configured as to the network equipment send communication equipment CSI feedback ability instruction and/or The instruction of the antenna configuration state of communication equipment, and be configured as receiving from the network equipment will be by for CSI type instruction receiving unit The instruction for the CSI feedback type that communication equipment uses.
Another aspect of the disclosure also provides the net in cordless communication network (for example, communication network 100 shown in FIG. 1) Network equipment.The network equipment includes that signal transmitting unit, reference signal receiving unit, the first CSI determination unit, CSI information connect Receive unit and the 2nd CSI determination unit.Wherein, signal transmitting unit is configured as sending to communication equipment logical for determining Believe the signal of the CSI of the channel between equipment and the network equipment.The channel includes the first subchannel and the second subchannel.With reference to letter Number receiving unit is configured as receiving reference signal from communication equipment, and the first CSI determination unit is configured as based on being connect The reference signal of receipts determines the CSI of the first subchannel.CSI information receiving unit is configured as receiving from communication equipment about the The information of the CSI of two subchannels, wherein the received CSI about the second subchannel information based on the CSI of the first subchannel With the CSI of the second subchannel.2nd CSI determination unit be configured as based on the received CSI about the second subchannel letter Breath, determines the CSI of the second subchannel.
In a further embodiment, which can also optionally include instruction receiving unit and/or CSI type Indicate transmission unit.U instruction receiving unit is configured as receiving the ability about CSI feedback of the communication equipment from communication equipment Instruction and/or communication equipment antenna configuration state instruction, and CSI type instruction transmission unit be configured as setting to communication Preparation is sent will be by the instruction for the CSI feedback type that the communication equipment uses.
In one embodiment, which can execute the method 700 in conjunction with described in Fig. 7 A-7C, therefore combination side Operation described in method 700 is equally applicable herein, and repeats no more.
Fig. 8 show can be implemented in communication equipment or the network equipment (for example, the network equipment shown in FIG. 1 101 or Person's communication equipment 111) in or be implemented as the communication equipment or the network equipment device 800 simplified block diagram.
Device 800 may include one or more processors 810 (such as data processor) and be coupled to processor 810 One or more memories 820.Device 800 can also include the one or more emitter/receivers for being coupled to processor 810 840.Memory 820 can be non-transitory machinable medium, and it can store program or computer program produces Product 830.Computer program (product) 830 may include, when executing on associated processor 810, enabling device 800 The instruction of (such as executing method 400 or 700) is operated in accordance with an embodiment of the present disclosure.810 He of one or more processors The combination of one or more memories 820 can form the processing component 850 for being adapted for carrying out the various embodiments of the disclosure.
The various embodiments of the disclosure can by computer program or computer program product that processor 810 can be performed, Software, firmware, hardware or combinations thereof are realized.
Memory 820 can be suitable for any type of local technical environment, and any suitable number can be used It is realized according to memory technology, it is such as whole as the memory terminal equipment based on semiconductor of non-limiting example, magnetic memory End equipment and system, optical memory terminal device and system, fixed memory and removable memory.
Processor 810 can be suitable for any type of local technical environment, and may include as non-limiting It is exemplary one or more general purpose computer, special purpose computer, microprocessor, digital signal processor (DSP) and be based on multicore The processor of processor architecture.
Although having carried out some in foregoing description in the context of communication system shown in Fig. 1, this should not be by It is construed to limitation spirit and scope of the present disclosure.The principle and concept of the disclosure can be more generally applicable to other scenes.
In addition, the disclosure can also provide computer readable storage medium, such as comprising computer program as described above Or the memory of computer program product comprising machine readable media and machine readable transmission medium.Machine readable media Computer-readable medium can be referred to as, and may include machine readable storage medium, such as disk, tape, CD, phase transformation Memory or electronic memory terminal device, such as random access memory (RAM), read-only memory (ROM), flash memory device, CD-ROM, DVD, Blu-ray Disc etc..Machine readable transmission medium is referred to as carrier, and may include such as electricity, light, nothing The transmitting signal of line electricity, sound or other forms, carrier wave, infrared signal etc..
Technique described herein can realize by various means, so that the corresponding intrument that realization embodiment describes The device of one or more functions not only includes prior art means, but also including for realizing described in embodiment The component of the one or more functions of corresponding intrument, and it may include the separate part for each independent function, or It can be configured as the component for executing two or more functions.For example, these technologies can be with hardware (one or more dress Set), firmware (one or more devices), software (one or more modules) or combinations thereof realizes.It is real for firmware or software Module (for example, process, function etc.) Lai Jinhang of execution functions described herein can now be passed through.
The example embodiment of this paper is illustrated above by reference to the block diagram and flow chart of method and apparatus.It should be appreciated that block diagram Combination with the frame in each frame and block diagram and flow chart diagram of flow chart diagram respectively can be by including hardware, soft The various means of part, firmware and combinations thereof are realized.For example, in one embodiment, each frame of block diagram and flow chart diagram And the combination of block diagram and the frame in flow chart diagram can be by computer program or computer including computer program instructions Program product is realized.These computer program instructions can be loaded into general purpose computer, special purpose computer or other can compile To generate machine on journey data processing equipment, so that the instruction wound executed on computer or other programmable data processing units It builds for realizing the component for the function of being specified in one or more flow chart box.
Although this is understood not to require this generic operation with shown in addition, operation is described with particular order Particular order execute or execute in order, or execute it is all shown in operation to obtain desired result.In certain situations Under, multitask and parallel processing may be advantageous.Similarly, although it is thin comprising several concrete implementations in discussed above Section, but these are not necessarily to be construed as the limitation to the range of subject matter described herein, but it is distinctive to specific embodiment The description of feature.Certain features described in the context of separated embodiment can also individually implemented in the present specification It is combined to achieve in example.On the contrary, the various features described in the context of single embodiment can also be dividually or with any Suitable sub-portfolio is realized in various embodiments.In addition, although features described above can be described as in the form of certain combinations Work, and it is even so initially so claimed, but claimed combined one or more features are in certain situations Under can be removed from combination, and combination claimed can be related to the variant of sub-portfolio or sub-portfolio.
It will be apparent to one skilled in the art that with advances in technology, idea of the invention can be with various Mode is realized.It provides above-described embodiment and is used to describe rather than limit the disclosure, and it is to be understood that not departing from this field In the case where the readily comprehensible spirit and scope of the present disclosure of technical staff, it can modify and modification.These modifications and change Type is considered in the scope of the disclosure and the accompanying claims.The protection scope of the disclosure is defined by the following claims.
In addition, in the disclosure, additionally providing the performance evaluation result of some solutions for proposition.Following In assessment/analysis, vector [M, N, P, Q] is used to indicate a kind of flat plane antenna configuration, and wherein M indicates line number, and N indicates columns, P Indicate polarization mode, Q indicates to send the number of radio unit (TXRU).P=1 indicates that single polarization, P=2 indicate cross polarization. Main system configuration used in Computer Simulation is as follows:
1.TRP antenna configuration [2,8,2,32] is fixed for all emulation；
2. there is totally 9 users, the antenna configuration of each user is [1,2,2,4], in an uplink transmission, Yong Huke To be configured up to 4 SRS resources.And for large-scale and multiple users scene, SRS should be used to support more subscriber channels Measurement, antenna subset are used for SRS transmission.In simulations, SrsPortNum is used to indicate that the SRS money of every user's actual use Source.
3. subscriber channel information based on acquisition is used for multi-user and multithread tune about maximum and rate greedy search Degree.In each TRP up to 8 stream of dispatching algorithm limitation, each user up to 2 streams.
Have evaluated following 5 solution a)-e obtained for CSI):
A) complete reciprocity CSI.In this scenario, each user uses 4 SRS resources in an uplink transmission, and And TRP is helped to obtain complete downlink channel status information.The performance is UPS upper performance score.
B) the specific code book of SRS+ user.This one of example embodiment proposed for the disclosure.Obtaining portion is measured by SRS Divide channel information, and remaining channel is quantified by the specific adaptive codebook of user and fed back to obtain.Common codebook is version There is defined in this 13 (R13) in horizontal domain and perpendicular domains the code book of 4 times of over-samplings.In simulations, SrsPortNum by with In the SRS resource for indicating every user's actual use.
C) the same phase matrix of SRS+.This is another example embodiment proposed in the disclosure.Equally, in simulations, SrsPortNum is used to indicate that the SRS resource of every user's actual use.
D) SRS+R13 common codebook.This is one of the solution of the prior art.Wherein, partial channel knowledge passes through SRS Measurement obtains, remaining channel is quantified and fed back by common codebook to obtain.Common codebook be R13 defined in horizontal domain and hang down Straight domain has the code book of 4 times of over-samplings.In simulations, SrsPortNum is used to indicate that the SRS resource of every user's actual use.
E) R13 code book.This is the solution of another prior art.In the program, subscriber channel is completely by common codebook Quantization, and the index of the code word selected is fed back to TRP.Common codebook is to have defined in R13 in horizontal domain and perpendicular domains There is the code book of 4 times of over-samplings.
Solution a) is always using 4 SRS resources to help TRP to obtain complete downlink channel, therefore the party Case has upper limit performance.For other solutions, including scheme b)-d), each user uses part SRS resource (SrsPortNum=2 or 3) and limited feedback.In scheme e), user does not use any SRS resource in uplink, And its operation is identical as FDD system.
Fig. 9 shows performance of five solutions under the configuration of SrsPortNum=2 and compares.Wherein abscissa is noise Than (SNR), indulging index is the spectrum efficiency (SE) that each scheme obtains.Fig. 9 shows, the solution b) of proposition and c) both surpasses Existing solution d) and performance e), and the difference with the increase of SNR, between the solution and the upper limit of proposition are crossed Away from keeping close to a steady state value.And existing solution d) and performance e) sharply deteriorate with the increase of SNR.For MU- MIMO is sent, it can be assumed that each user has high-quality channel corresponding with the high region SNR.This means that the solution party proposed It case b) and c) works for MU-MIMO good.As previously described, in simulations, total number for sending stream is limited to up to 8, And the fluxion of every user is restricted to up to 2.Multi-user and multithread scheduling are executed, using greedy search algorithm to maximize System and rate.
Fig. 9 also shows that the performance of scheme c) is more than scheme b), but gain difference is limited, the two performance curve weighs substantially It closes.The advantage of scheme c) is that the computation complexity of the side UE and the side TRP is low.
The performance shown under the scene of SrsPortNum=3 in Figure 10 compares.It can be found that in every user using more When more SRS resources, the gap between complete reciprocity CSI solution a) (upper limit) and the solution proposed reduces.Figure 10 It is also shown under transmission configuration (SrsPortNum=3), the solution b) of proposition and performance c) are still above existing solution Certainly scheme d) and e).
Based on the above analysis and simulation result, it is found that embodiment of the disclosure (such as evaluated scheme b) and C)) there is under the several scenes being for example listed below advantage.
If i) user is received using different antenna configurations for downlink and uplink is sent, for example, being used for The antenna port number of downlink is greater than the antenna port number for uplink, the solution b) proposed and can c) help It helps TRP to obtain the downlink CSI of more accurate every user, and obtains the performance close to the upper limit.Optionally, user can be to TRP feeding back antenna configuration status, and TRP sends confirmation message to user, so that the operation that TRP and UE is obtained about CSI Unanimously (match).
Ii) if user is received using identical antenna configuration for downlink and uplink is sent, for example, being used for The antenna port number of downlink is equal to the antenna port number for uplink, then it is mutual can theoretically to obtain complete channel Yi Xing, and TRP can obtain perfect channel state information.And for real system, SRS resource is limited.If TRP is obtained using the solution proposed for CSI, and TRP can execute scheduling from bigger user's candidate collection, to obtain Obtain higher multi-subscriber dispatching gain.In this case, TRP can for example notify specific CSI acquisition scheme to user, For example, operational version b) or c), so that the operation synchronization/matching of the two.
Iii) if TRP takes different transmission pre-coding schemes for different users, for example, being directed to irrelevant use Family group takes linear predictive coding, takes nonlinear precoding for high correlation user group, then can be directed to different user groups Use different SRS configuration strategies.For example, for high correlation user group, it is preferable to use accurate CSI, because to these use Family uses non-linear transmission scheme, and non-linear transmission scheme requires more accurate CSI.Correspondingly, those users can be divided With more SRS resources.For non-associated users group, the transmission scheme based on linear predictive coding can be used, and can make Scheme is obtained with the CSI of proposition.In this case, TRP can also inform the user CSI and obtain scheme.In other implementations In example, user can know CSI scheme to be used scheduled configuration or by way of implying.In addition, if for using The pre-coding scheme at family due to TRP decision or moving for user and change, then TRP can also be informed the user new CSI obtains scheme.

Claims (25)

1. the method implemented at the communication equipment that one kind operates in time division duplex (TDD) wireless communication system, comprising:
Based on the signal from the network equipment, the channel status of the channel between the communication equipment and the network equipment is obtained Information (CSI)；The channel includes the first subchannel and the second subchannel；
Reference signal is sent to the network equipment, to indicate the information of the CSI about first subchannel；
The CSI of CSI and second subchannel based on first subchannel, the pass that determination will be sent to the network equipment In the information of the CSI of second subchannel；And
The information of the identified CSI about second subchannel is sent to the network equipment.
2. according to the method described in claim 1, wherein obtaining the communication equipment and institute based on the signal from the network equipment The CSI for stating the channel between the network equipment includes:
The CSI of the channel is obtained based on the CSI reference signal (CSI-RS) from the network equipment.
3. according to the method described in claim 1, wherein first subchannel and second subchannel are led to described respectively Believe that the first subset of the antenna port of equipment is associated with second subset.
4. according to the method described in claim 3, wherein including: to network equipment transmission reference signal
Described in being sent by first subset with the associated antenna port of the first subchannel to the network equipment Reference signal.
5. according to the method described in claim 1, CSI and second subchannel wherein based on first subchannel CSI, determination will include: to the information of the CSI about second subchannel of network equipment transmission
CSI based on first subchannel obtains the transmission covariance matrix of first subchannel；
Based on the transmission covariance matrix and for the common codebook of second subchannel, determine that the communication equipment is specific Code book；
The matched code word of CSI with second subchannel is selected from the identified specific code book of communication equipment；With And
The instruction of the code word is determined as described in the CSI about second subchannel to send to the network equipment Information.
6. according to the method described in claim 5, the CSI wherein based on first subchannel obtains first subchannel Sending covariance matrix includes:
Future, the bandwidth of the signal of automatic network equipment was divided into multiple subbands；And
Obtain the transmission covariance matrix of first subchannel respectively for each subband in the multiple subband.
7. according to the method described in claim 5, wherein based on the transmission covariance matrix and being used for second subchannel Common codebook, determine that the specific code book of the communication equipment includes:
The specific code book of the communication equipment is obtained by following formula:
Wherein wiIndicate i-th of code word in the common codebook, L indicates that the sum of the code word in the common codebook, R indicate institute Transmission covariance matrix is stated, | | | |FExpression takes the operation of F norm, and ciThe specific code of communication equipment determined by indicating I-th of code word in this.
8. according to the method described in claim 1, CSI and second subchannel wherein based on first subchannel CSI, determination will include: to the information of the CSI about second subchannel of network equipment transmission
The CSI of CSI and second subchannel based on first subchannel obtain second subchannel and described first Same phase matrix between subchannel；And
The CSI's about second subchannel that the instruction of the same phase matrix is determined as sending to the network equipment The information.
9. according to the method described in claim 8, wherein the instruction of the same phase matrix includes:
The index with the same matched code word of phase matrix selected from the code book for the same phase matrix, or
The value of element in the same phase matrix.
10. according to the method described in claim 1, further comprising at least one sent to the network equipment in following information The instruction of item:
The CSI feedback ability of the communication equipment；And
The antenna configuration state of the communication equipment.
11. according to the method described in claim 1, further comprising:
It will be by the instruction of the type for the CSI feedback that the communication equipment uses from network equipment reception.
12. the method implemented at the network equipment that one kind operates in time division duplex (TDD) wireless communication system, comprising:
The channel state information for determining the channel between the communication equipment and the network equipment is sent to communication equipment (CSI) signal, the channel include the first subchannel and the second subchannel；
Reference signal is received from the communication equipment；
Based on the received reference signal of institute, the CSI of first subchannel is determined；
The information of the CSI about second subchannel is received from the communication equipment, wherein institute is received about described second The CSI of CSI and second subchannel of the information of the CSI of subchannel based on first subchannel；And
Based on the received CSI about second subchannel information, determine the CSI of second subchannel.
13. according to the method for claim 12, wherein sending to communication equipment for estimating the communication equipment and described The signal of the CSI of channel between the network equipment includes:
CSI reference signal (CSI-RS) is sent to the communication equipment.
14. according to the method for claim 12, wherein first subchannel and second subchannel respectively with it is described First subset of the antenna port of communication equipment is associated with second subset.
15. according to the method for claim 14, wherein being come from and institute from the received reference signal of the communication equipment State first subset of the associated antenna port of the first subchannel.
16. according to the method for claim 12, wherein receiving the CSI about second subchannel from the communication equipment Information include:
The index of the code word for second subchannel is received from the communication equipment, the code word comes from the communication equipment Specific code book；And
Based on the received CSI about second subchannel information, determine that the CSI of second subchannel includes:
CSI based on first subchannel obtains the transmission covariance matrix of first subchannel；
Based on the transmission covariance matrix and for the common codebook of second subchannel, determine that the communication equipment is specific Code book；And
Based on the received index of institute, the code word for being used for second subchannel is determined from identified code book.
17. according to the method for claim 16, wherein the CSI based on first subchannel obtains first subchannel Transmission covariance matrix include:
The bandwidth of the signal sent to communication equipment is divided into multiple subbands；And
Obtain the transmission covariance matrix of first subchannel respectively for each subband in the multiple subband.
18. according to the method for claim 16, wherein based on the transmission covariance matrix and for the second son letter The common codebook in road determines that the specific code book of the communication equipment for second subchannel includes:
It is obtained by following formula and is used for the specific code book of the communication equipment:
Wherein wiIndicate i-th of code word in the common codebook, L indicates that the sum of the code word in the common codebook, R indicate institute Transmission covariance matrix is stated, | | | |FExpression takes the operation of F norm, and ciThe specific code of communication equipment determined by indicating I-th of code word in this.
19. according to the method for claim 12, wherein receiving the CSI about second subchannel from the communication equipment Information include:
The instruction of the same phase matrix between second subchannel and first subchannel is received from the communication equipment；And
Based on the received CSI about second subchannel information, determine that the CSI of second subchannel includes:
Based on identified first subchannel CSI and institute the received same phase matrix the instruction, acquisition described second The CSI of subchannel.
20. according to the method for claim 19, wherein the instruction of the same phase matrix includes:
The index with the same matched code word of phase matrix selected from the code book for the same phase matrix, or
The value of element in the same phase matrix.
21. according to the method for claim 12, further comprising:
It will be by the instruction of the type for the CSI feedback that the communication equipment uses to communication equipment transmission.
22. according to the method for claim 21, further including at least one received from the communication equipment in following information Instruction:
The CSI feedback ability of the communication equipment；And
The antenna configuration state of the communication equipment.
23. a kind of device, including processor and memory, the memory includes the instruction that can be performed by the processor, by The operation of this described device is execution method according to any one of claim 1 to 11.
24. a kind of device, including processor and memory, the memory includes the instruction that can be performed by the processor, by The operation of this described device is to execute method described in any one of 2 to 22 according to claim 1.
25. a kind of computer readable storage medium with the computer program product being implemented on, the computer program Product includes instruction, so that at least one described processor is executed basis when described instruction is performed on at least one processor Method described in any one of claim 1 to 22.
CN201710736921.8A 2017-08-24 2017-08-24 Method and apparatus for determining channel state information Active CN109428639B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201710736921.8A CN109428639B (en) 2017-08-24 2017-08-24 Method and apparatus for determining channel state information
PCT/CN2018/101789 WO2019037745A1 (en) 2017-08-24 2018-08-22 Method and apparatus for determining channel state information

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710736921.8A CN109428639B (en) 2017-08-24 2017-08-24 Method and apparatus for determining channel state information

Publications (2)

Publication Number Publication Date
CN109428639A true CN109428639A (en) 2019-03-05
CN109428639B CN109428639B (en) 2021-04-09

Family

ID=65439957

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710736921.8A Active CN109428639B (en) 2017-08-24 2017-08-24 Method and apparatus for determining channel state information

Country Status (2)

Country Link
CN (1) CN109428639B (en)
WO (1) WO2019037745A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111162822A (en) * 2019-12-05 2020-05-15 东南大学 Method and system for acquiring large-scale MIMO beam domain statistical channel information
WO2021102917A1 (en) * 2019-11-29 2021-06-03 Nokia Shanghai Bell Co., Ltd. Feedback of channel state information
WO2021142631A1 (en) * 2020-01-14 2021-07-22 Nokia Shanghai Bell Co., Ltd. Method, device and computer readable medium of communication
CN113645613A (en) * 2021-07-08 2021-11-12 中国人民解放军战略支援部队信息工程大学 Real-time voice encryption equipment and method for cellular mobile network

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100238824A1 (en) * 2009-03-20 2010-09-23 Qualcomm Incorporated Feedback mechanisms for beamforming operation
CN103220068A (en) * 2012-01-19 2013-07-24 中兴通讯股份有限公司 Channel state information processing method, device and system
WO2014101170A1 (en) * 2012-12-31 2014-07-03 上海贝尔股份有限公司 Channel reciprocity compensating method and device in fdd system
WO2015032038A1 (en) * 2013-09-04 2015-03-12 华为技术有限公司 Channel measurement method, terminal device and base station
CN104604285A (en) * 2012-10-23 2015-05-06 Lg电子株式会社 Method for feeding back channel state information in wireless communication system and apparatus therefor
CN106160952A (en) * 2015-04-17 2016-11-23 中国移动通信集团公司 A kind of channel information feedback method and device
CN106452538A (en) * 2015-08-07 2017-02-22 上海贝尔股份有限公司 Short-period feedback method and device for MIMO (multiple-input-multiple-output) communication

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101630966B (en) * 2009-08-20 2015-04-01 中兴通讯股份有限公司 Feedback method of channel quality in multi-input and multi-output system
US10063395B2 (en) * 2015-01-05 2018-08-28 Lg Electronics Inc. Method for estimating channel status in wireless communication system, and apparatus therefor
CN106817720B (en) * 2015-11-27 2019-07-02 中兴通讯股份有限公司 A kind of method and device obtaining channel information

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100238824A1 (en) * 2009-03-20 2010-09-23 Qualcomm Incorporated Feedback mechanisms for beamforming operation
CN103220068A (en) * 2012-01-19 2013-07-24 中兴通讯股份有限公司 Channel state information processing method, device and system
CN104604285A (en) * 2012-10-23 2015-05-06 Lg电子株式会社 Method for feeding back channel state information in wireless communication system and apparatus therefor
WO2014101170A1 (en) * 2012-12-31 2014-07-03 上海贝尔股份有限公司 Channel reciprocity compensating method and device in fdd system
WO2015032038A1 (en) * 2013-09-04 2015-03-12 华为技术有限公司 Channel measurement method, terminal device and base station
CN105264802A (en) * 2013-09-04 2016-01-20 华为技术有限公司 Channel measurement method, terminal device and base station
CN106160952A (en) * 2015-04-17 2016-11-23 中国移动通信集团公司 A kind of channel information feedback method and device
CN106452538A (en) * 2015-08-07 2017-02-22 上海贝尔股份有限公司 Short-period feedback method and device for MIMO (multiple-input-multiple-output) communication

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021102917A1 (en) * 2019-11-29 2021-06-03 Nokia Shanghai Bell Co., Ltd. Feedback of channel state information
CN111162822A (en) * 2019-12-05 2020-05-15 东南大学 Method and system for acquiring large-scale MIMO beam domain statistical channel information
WO2021142631A1 (en) * 2020-01-14 2021-07-22 Nokia Shanghai Bell Co., Ltd. Method, device and computer readable medium of communication
CN113645613A (en) * 2021-07-08 2021-11-12 中国人民解放军战略支援部队信息工程大学 Real-time voice encryption equipment and method for cellular mobile network
CN113645613B (en) * 2021-07-08 2023-07-04 中国人民解放军战略支援部队信息工程大学 Cellular mobile network real-time voice encryption equipment and method

Also Published As

Publication number Publication date
CN109428639B (en) 2021-04-09
WO2019037745A1 (en) 2019-02-28

Similar Documents

Publication Publication Date Title
US11689255B2 (en) Wireless communication system, and device and method in wireless communication system
US11811702B2 (en) System and method for flexible channel state information-reference signal transmission
KR20190044100A (en) Design of Channel State Information Framework for 5G Multiple Input Multiple Output Transmission
CN103703712B (en) The method of configurating channel state information reference signals and base station
CN110365448A (en) The system and method that interference characteristic is used for interference mitigation are provided
CN106575988A (en) Parallel channel training in multi-user multiple-input and multiple-output system
CN101755392A (en) Be used for the beam forming vector is carried out the wireless communications method and the equipment of Code And Decode
WO2021159460A1 (en) Indication of information in channel state information (csi) reporting
CN109428639A (en) Method and apparatus for determining channel state information
CN111512571B (en) Method and apparatus for signal detection in a MIMO communication system
CN112751592B (en) Method and communication device for reporting channel state information
WO2016185749A1 (en) Device, method, and program
CN112583501B (en) Channel measurement method and communication device
CN112751598B (en) Method for processing precoding matrix and communication device
CN105745845B (en) User equipment, the method and apparatus of precoding are carried out using autocorrelation matrix
WO2018154937A1 (en) Wireless base station and wireless communication method
WO2020077504A1 (en) Methods, devices and computer readable medium for downlink transmissions
WO2020042107A1 (en) Determination of downlink channel state information in massive mimo systems
Xu et al. Review of 5g mimo enhancement technologies
WO2022227976A1 (en) Communication method and communication device
Zhao et al. Enhanced CSI acquisition scheme for NR TDD systems with partial channel reciprocity
CN115244863A (en) Updating method and communication device
WO2018127072A1 (en) Channel information feedback method, channel information determining method, receive-end device, and transmit-end device
CN116762283A (en) Method and device for precoding
CN107404345A (en) A kind of method and apparatus in radio communication

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant