CN106685623A - Time-delay compensation method, user equipment and base station - Google Patents

Time-delay compensation method, user equipment and base station Download PDF

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Publication number
CN106685623A
CN106685623A CN201611067482.8A CN201611067482A CN106685623A CN 106685623 A CN106685623 A CN 106685623A CN 201611067482 A CN201611067482 A CN 201611067482A CN 106685623 A CN106685623 A CN 106685623A
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antenna port
channel
trx
time delay
base station
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CN106685623B (en
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周宝龙
胡宏杰
朱有团
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Huawei Technologies Co Ltd
Shanghai Huawei Technologies Co Ltd
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Shanghai Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
    • H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

The embodiment of the invention discloses a time-delay compensation method, user equipment and a base station. The channel time delay of each antenna port can be reduced, so codebook gain can be increased. The method comprises steps that the user equipment UE receives the downlink pilot frequency sent by the base station through at least two antenna ports; the UE carries out time delay measurement according to the downlink pilot frequency so as to obtain the channel time delay of each antenna port; when the UE sends the channel time delays to the base station, the UE carries out time delay compensation on downlink base band channels according to the channel time delays so as to obtain downlink base band channels subjected to the time delay compensation; the UE carries out precoding matrix index PMI measurement on the downlink base band channels subjected to the time delay compensation so as to obtain a codebook vector; and the UE sends the codebook vector to the base station.

Description

A kind of delay compensation method, user equipment and base station
Technical field
The present invention relates to communication technical field, more particularly to a kind of delay compensation method, user equipment and base station.
Background technology
5th third-generation mobile communication (English full name：5th-Generation, english abbreviation：5G) high frequency using mixed-beam into Shape (English full name：Hybrid Beamforming, english abbreviation：HBF) technology carrys out transmission data.Beamforming patterns have two Kind, one kind is based on time division duplex (English full name：Time DivisionDuplex, english abbreviation：TDD) up-downgoing reciprocity Beam shaping, another is based on user equipment (English full name：User Equipment, english abbreviation：UE) the code of feedback This vector.In 5G high frequencies, there are different time delays in the signal of each antenna port transmission of base station, this can cause UE when reaching UE Pre-coding matrix index (the English full name of selection：Precoding Matrix Index, english abbreviation：) and actual transmissions PMI Channel Incomplete matching, so as to reduce codebook gain.It is therefore desirable to during the passage of each antenna port of UE measurements and feedback base station Prolong, and feed back to base station, so that base station first carries out delay compensation before downlink data transmission.
In existing scheme, typically delay compensation is carried out using subband feedback technology.
However, in 5G high frequencies, if still adopting subband feedback technology, need significantly to reduce subband bandwidth, and by It is very big in 5G high frequency bandwidths, so feedback overhead can be caused to be significantly increased, so the delay compensation method that existing scheme is adopted It is inapplicable.
The content of the invention
A kind of delay compensation method, user equipment and base station are embodiments provided, each antenna port can be reduced Channel time delay, so as to improve codebook gain.
Embodiment of the present invention first aspect provides a kind of delay compensation method, it may include：Base station passes through at least two days Line end mouth to user equipment (UE) sends descending pilot frequency, and descending pilot frequency can be, but not limited to CSI pilot tones and beam scanning pilot tone etc.； UE is received after descending pilot frequency, and UE carries out latency measurement according to the descending pilot frequency for receiving, and by latency measurement each antenna is obtained The channel time delay of port；Channel time delay is sent to base station by one side UE, and another aspect UE is according to channel time delay to downgoing baseband Channel carries out delay compensation, obtains the downgoing baseband channel after delay compensation；Then UE is according to the downgoing baseband after delay compensation Channel carries out PMI measurements, obtains codebook vectors；Finally, codebook vectors are sent to base station by UE.It can be seen that, UE is based on descending pilot frequency Latency measurement is carried out, the channel time delay of each antenna port is obtained, UE carries out delay compensation to downgoing baseband channel, when being finally based on Prolonging the downgoing baseband channel after compensation carries out PMI measurements, obtains codebook vectors, codebook vectors is sent to into base station, so as to base station Process is weighted to the data for being sent to UE using the codebook vectors, so as to reduce the channel time delay of each antenna port, is carried High codebook gain.
In some possible implementations, UE carries out LS channel estimation according to the descending pilot frequency for receiving, and Latency measurement is carried out according to least square channel, the channel time delay of each antenna port is obtained.Least square channel can be frequency domain Least square channel, or time domain least square channel.That is UE can be directly each in frequency domain measurement using frequency domain least square channel The channel time delay of antenna port, it is also possible to frequency domain least square channel conversion be time domain least square channel, using time domain work( Rate delay profile is measuring the channel time delay of each antenna port.
In other possible implementations, UE calculates the relative reference antenna in each target antenna port according to channel time delay Port each pilot tone phase shift on sub-carriers, above-mentioned each target antenna port and reference antenna port composition above-mentioned at least two Individual antenna port, that is, assume at least two antenna ports for antenna port 1, antenna port 2 and antenna port 3, then each target Antenna port can be antenna port 1 and antenna port 2, then reference antenna port is antenna port 3；UE constitutes phase shift Default vector；UE carries out delay compensation according to default vector to downgoing baseband channel.
In other possible implementations, above-mentioned target antenna port is located with respect to reference antenna port in each pilot tone Phase shift on subcarrier is generated according to equation below：Wherein, TRXiFor target antenna Port, TRX1For reference antenna port,For phase shift,For target antenna port TRXiWith respect to reference antenna port TRX1 Delay inequality, k is TRXiL-th pilot frequency locations place subcarrier numbering, NIFFTFor IFFT length, NTxRepresent the day of base station Line port number.
In other possible implementations, it is following vector to preset vector：Its In, δlTo preset vector.
In other possible implementations, the downgoing baseband channel after delay compensation is obtained by equation belowWherein, ⊙ is represented Dot product, heff,1L () represents the downgoing baseband channel before delay compensation, (δk)*Represent default vector deltalConjugation.
Embodiment of the present invention second aspect provides a kind of delay compensation method, it may include：Base station passes through at least two days Line end mouth to user equipment (UE) sends descending pilot frequency, and descending pilot frequency can be, but not limited to CSI pilot tones and beam scanning pilot tone etc.； UE carries out latency measurement according to the descending pilot frequency for receiving, and obtains the channel time delay of each antenna port, and UE sends channel time delay To base station, and UE carries out delay compensation according to channel time delay to downgoing baseband channel, obtains the downgoing baseband after delay compensation Channel, UE carries out PMI measurements and obtains the first codebook vectors according to the downgoing baseband channel after delay compensation, and the first code book is being sweared Amount is sent to base station；Base station is received after channel time delay and the first codebook vectors, and base station is according to channel time delay and first yard This vector carries out delay compensation to downgoing baseband channel, obtains the second codebook vectors after delay compensation.It can be seen that, base station is according to logical Road time delay and the first codebook vectors for receiving carry out delay compensation to downgoing baseband channel, obtain second after delay compensation Codebook vectors, base station can carry out precoding weighting process using second codebook vectors to the data for being sent to UE, so as to subtract The little channel time delay of each antenna port, improves codebook gain.
In some possible implementations, base station calculates the relative reference antenna in each target antenna port according to channel time delay Phase shift of the port on each subcarrier, each target antenna port and reference antenna port constitute at least two antenna ports, i.e., false If at least two antenna ports are antenna port 1, antenna port 2 and antenna port 3, then each target antenna port can be day Line end mouth 1 and antenna port 2, then reference antenna port is antenna port 3；Base station phase shift composition is preset into vector；Base station Delay compensation is carried out to downgoing baseband channel according to default vector and the first codebook vectors, the second code after delay compensation is obtained This vector.
In other possible implementations, above-mentioned target antenna port is with respect to reference antenna port on each subcarrier Phase shift according to equation below generate：
Wherein, TRXiFor target antenna port, TRX1For reference antenna port,It is target antenna port TRXiRelatively Reference antenna port TRX1Delay inequality, k for subcarrier numbering, NIFFTFor IFFT length, NTxRepresent the antenna port of base station Number.
Now, it is following vector to preset vector：
Wherein, δkTo preset vector.
In other possible implementations, the second codebook vectors w' after delay compensation are obtained by equation belowm (k):
Wherein, ⊙ represents dot product, (δk)*Represent default vector deltakConjugation, wmThe first codebook vectors are represented,
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：User equipment is based on descending pilot frequency Latency measurement is carried out, the channel time delay of each antenna port is obtained, user equipment carries out delay compensation to downgoing baseband channel, finally PMI measurements are carried out based on the downgoing baseband channel after delay compensation, codebook vectors are obtained, codebook vectors are sent to into base station, with Just base station is weighted process using the codebook vectors to the data for being sent to UE, during so as to the passage for reducing each antenna port Prolong, improve codebook gain.
Description of the drawings
Fig. 1 is the principle schematic of the delay compensation method in the embodiment of the present invention；
Fig. 2 is the delay compensation method one embodiment schematic diagram in the embodiment of the present invention；
Fig. 3 is the user equipment (UE) one embodiment schematic diagram in the embodiment of the present invention；
Fig. 4 is user equipment (UE) another embodiment schematic diagram in the embodiment of the present invention；
Fig. 5 is the base station one embodiment schematic diagram in the embodiment of the present invention；
Fig. 6 is another embodiment schematic diagram of base station in the embodiment of the present invention.
Specific embodiment
A kind of delay compensation method, user equipment and base station are embodiments provided, each antenna port can be reduced Channel time delay, so as to improve codebook gain.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.
Term " first ", " second ", " the 3rd " in description and claims of this specification and above-mentioned accompanying drawing, " Four " etc. (if present) is the object for distinguishing similar, without for describing specific order or precedence.Should manage The data that solution is so used can be exchanged in the appropriate case, so that the embodiments described herein can be with except illustrating here Or the order beyond the content of description is implemented.Additionally, term " comprising " and " having " and their any deformation, it is intended that Covering is non-exclusive to be included, and for example, containing process, method, system, product or the equipment of series of steps or unit need not limit In those steps or unit for clearly listing, but may include clearly not list or for these processes, method, product Other intrinsic steps of product or equipment or unit.
The principle of the delay compensation method in the embodiment of the present invention is illustrated below, refers to Fig. 1, Fig. 1 is this The principle schematic of the delay compensation method in bright embodiment.In FIG, descending pilot frequency, such as channel status are launched in base station to UE Information (English full name：Channel State Information, english abbreviation：CSI) pilot tone, beam scanning pilot tone etc..UE can Least square (English full name is carried out based on this kind of descending pilot frequency：Least Square, english abbreviation：LS) channel estimation, then Latency measurement is carried out based on LS channel estimations.After obtaining the channel time delay of each antenna port, when UE is carried out to downgoing baseband channel Prolong compensation, being finally based on the downgoing baseband channel after delay compensation carries out PMI measurements.Meanwhile, UE is needed each antenna for measuring The time delay feedback of port is to base station.Base station obtain each antenna port when delay, it is also desirable to carry out delay compensation, then could be right Being sent to the user data of UE carries out precoding weighting.
The delay compensation method in the embodiment of the present invention is illustrated below by specific embodiment, refers to Fig. 2, this Delay compensation method one embodiment includes in inventive embodiments：
101st, base station sends descending pilot frequency by least two antenna ports to user equipment (UE)；
In the present embodiment, descending pilot frequency can be, but not limited to CSI pilot tones and beam scanning pilot tone etc..
102nd, UE carries out latency measurement according to descending pilot frequency, obtains the channel time delay of each antenna port, performs respectively afterwards Step 103 and step 106；
Optionally, in some possible embodiments, above-mentioned UE carries out latency measurement according to descending pilot frequency, obtains each antenna The channel time delay of port can be：
UE carries out LS channel estimation according to descending pilot frequency, and carries out latency measurement according to least square channel, obtains To the channel time delay of each antenna port.
Further, above-mentioned least square channel can be frequency domain least square channel, or time domain least square channel.
It should be understood that UE can utilize frequency domain least square channel directly in the channel time delay of each antenna port of frequency domain measurement, Can also be time domain least square channel frequency domain least square channel conversion, using time-domain power delay profile (English full name： Power Delay Profile, english abbreviation：PDP) measuring the channel time delay of each antenna port.Certainly the present invention can also Using other modes come Measurement channel time delay, it is not construed as limiting herein.
103rd, UE carries out delay compensation according to channel time delay to downgoing baseband channel, obtains the downgoing baseband after delay compensation Channel；
Optionally, in some possible embodiments, above-mentioned UE carries out time delay according to channel time delay to downgoing baseband channel Compensating to be：
UE calculates the relative reference antenna port in each target antenna port in each pilot tone institute on sub-carriers according to channel time delay Phase shift, above-mentioned each target antenna port and reference antenna port constitute above-mentioned at least two antenna port；
Phase shift composition is preset vector by UE；
UE carries out delay compensation according to default vector to downgoing baseband channel.
Further, above-mentioned target antenna port with respect to reference antenna port each pilot tone phase shift on sub-carriers press Generate according to equation below：
Wherein, TRXiFor target antenna port, TRX1For reference antenna port,For phase shift,For target day line end Mouth TRXiWith respect to reference antenna port TRX1Delay inequality, k is TRXiL-th pilot frequency locations place subcarrier numbering, NIFFT For IFFT length, NTxRepresent the antenna port number of base station.
Now, it is following vector to preset vector：
Wherein, δlTo preset vector.
Further, above-mentioned UE carries out delay compensation according to default vector to downgoing baseband channel, after obtaining delay compensation Downgoing baseband channel can be：
Downgoing baseband channel H ' after delay compensation is obtained by equation beloweff(l)：
Wherein, ⊙ represents dot product, heff,1L () represents the downgoing baseband channel before delay compensation, (δk)*Represent default vector δlConjugation.
104th, UE carries out pre-coding matrix index PMI measurements according to the downgoing baseband channel after delay compensation, obtains first Codebook vectors；
105th, the first codebook vectors are sent to base station by UE；
106th, channel time delay is sent to base station by UE；
107th, base station carries out delay compensation according to channel time delay and the first codebook vectors to downgoing baseband channel, when obtaining Prolong the second codebook vectors after compensation.
In the present embodiment, user equipment carries out latency measurement based on descending pilot frequency, obtains the channel time delay of each antenna port, User equipment carries out delay compensation to downgoing baseband channel, and being finally based on the downgoing baseband channel after delay compensation carries out PMI surveys Amount, obtains codebook vectors, codebook vectors is sent to into base station, so that base station is entered using the codebook vectors to the data for being sent to UE Row weighting is processed, and so as to reduce the channel time delay of each antenna port, improves codebook gain.
Optionally, in some possible embodiments, above-mentioned base station is according to channel time delay and the first codebook vectors under Row baseband channel carries out delay compensation, and obtaining the second codebook vectors after delay compensation can be：
Base station calculates relative phase shift of the reference antenna port on each subcarrier in each target antenna port according to channel time delay, Each target antenna port and reference antenna port constitute at least two antenna ports；
Base station phase shift composition is preset into vector；
Base station carries out delay compensation according to default vector and the first codebook vectors to downgoing baseband channel, obtains time delay benefit The second codebook vectors after repaying.
Further, phase shift of the above-mentioned target antenna port with respect to reference antenna port on each subcarrier is according to following public affairs Formula is generated：
Wherein, TRXiFor target antenna port, TRX1For reference antenna port,It is target antenna port TRXiRelatively Reference antenna port TRX1Delay inequality, k for subcarrier numbering, NIFFTFor IFFT length, NTxRepresent the antenna port of base station Number.
Now, it is following vector to preset vector：
Wherein, δkTo preset vector.
Further, above-mentioned base station carries out time delay benefit according to default vector and the first codebook vectors to downgoing baseband channel Repay, obtaining the second codebook vectors after delay compensation is：
The second codebook vectors w' after delay compensation are obtained by equation belowm(k):
Wherein, ⊙ represents dot product, (δk)*Represent default vector deltakConjugation, wmThe first codebook vectors are represented,
The delay compensation method in the embodiment of the present invention is described above with embodiment, below by embodiment this is introduced User equipment (UE) in inventive embodiments.
Fig. 3 is referred to, user equipment (UE) one embodiment includes in the embodiment of the present invention：
Receiver module 201, for receiving the descending pilot frequency that base station is sent by least two antenna ports；
First processing module 202, for carrying out latency measurement according to descending pilot frequency, when obtaining the passage of each antenna port Prolong；
First sending module 203, for channel time delay to be sent to into base station；
Second processing module 204, for when channel time delay is sent to base station by the first sending module 203, according to passage Time delay carries out delay compensation to downgoing baseband channel, obtains the downgoing baseband channel after delay compensation；
3rd processing module 205, for carrying out pre-coding matrix index PMI according to the downgoing baseband channel after delay compensation Measurement, obtains codebook vectors；
Second sending module 206, for codebook vectors to be sent to into base station.
In the present embodiment, first processing module 202 carries out latency measurement based on descending pilot frequency, obtains the logical of each antenna port Road time delay, Second processing module 204 carries out delay compensation to downgoing baseband channel, and last 3rd processing module 205 is based on time delay Downgoing baseband channel after compensation carries out PMI measurements, obtains codebook vectors, and codebook vectors are sent to into base station, so that base station makes Process is weighted to the data for being sent to UE with the codebook vectors, so as to reduce the channel time delay of each antenna port, is improved Codebook gain.
In some alternative embodiments of the present invention, above-mentioned first processing module 202, specifically for being entered according to descending pilot frequency Row LS channel estimation, and latency measurement is carried out according to least square channel, obtain the channel time delay of each antenna port.
Further, above-mentioned least square channel can be frequency domain least square channel, or time domain least square channel.
It should be understood that first processing module 202 can be using frequency domain least square channel directly in each antenna end of frequency domain measurement Mouthful channel time delay, it is also possible to frequency domain least square channel conversion be time domain least square channel, each day is measured using PDP The channel time delay of line end mouth.Certainly the present invention can also be herein not construed as limiting using other modes come Measurement channel time delay.
In some alternative embodiments of the present invention, above-mentioned Second processing module 204, specifically for according to channel time delay meter Calculate each target antenna port with respect to reference antenna port each pilot tone phase shift on sub-carriers, each target antenna port and ginseng Examine antenna port and constitute at least two antenna ports；By the default vector of phase shift composition；According to default vector to downgoing baseband channel Carry out delay compensation.
Further, above-mentioned Second processing module 204, it is relative specifically for generating target antenna port according to equation below Reference antenna port each pilot tone phase shift on sub-carriers：
Wherein, TRXiFor target antenna port, TRX1For reference antenna port,For phase shift,For target day line end Mouth TRXiWith respect to reference antenna port TRX1Delay inequality, k is TRXiL-th pilot frequency locations place subcarrier numbering, NIFFT For IFFT length, NTxRepresent the antenna port number of base station.
Further, it is following vector to preset vector：
Wherein, δlTo preset vector.
Further, above-mentioned Second processing module 204, specifically for obtaining descending after delay compensation by equation below Baseband channel H 'eff(l)：
Wherein, ⊙ represents dot product, heff,1L () represents the downgoing baseband channel before delay compensation, (δk)*Represent default vector δlConjugation.
Above the angle of slave module functional entity is described to the user equipment (UE) in the embodiment of the present invention, below The user equipment (UE) in the embodiment of the present invention is described from the angle of hardware handles, Fig. 4 is referred to, in the embodiment of the present invention User equipment (UE) include：Receptor 301, processor 302, emitter 303 and memorizer 304.
The present embodiments relate to user equipment (UE) can have than more or less of part illustrated in fig. 4, can To combine two or more parts, or there can be different parts to configure or set up, all parts can be including one Individual or multiple signal processing and/or special IC are realized in the combination of interior hardware, software or hardware and software.
Receptor 301 is used to perform following operation：
Receive the descending pilot frequency that base station is sent by least two antenna ports.
Processor 302 is used to perform following operation：
Latency measurement is carried out according to descending pilot frequency, the channel time delay of each antenna port is obtained.
Emitter 303 is used to perform following operation：
The channel time delay is sent to into the base station.
Processor 302 is additionally operable to perform following operation：
When channel time delay is sent to base station by emitter 303, time delay is carried out to downgoing baseband channel according to channel time delay Compensation, obtains the downgoing baseband channel after delay compensation；Pre-coding matrix is carried out according to the downgoing baseband channel after delay compensation Index PMI measurements, obtain codebook vectors.
Emitter 303 is additionally operable to perform following operation：
Codebook vectors are sent to into base station.
Memorizer 304 is used to store the code needed for the execution corresponding operating of processor 302.
In the present embodiment, processor 302 carries out latency measurement based on descending pilot frequency, when obtaining the passage of each antenna port Prolong, delay compensation is carried out to downgoing baseband channel, being finally based on the downgoing baseband channel after delay compensation carries out PMI measurements, obtains To codebook vectors, codebook vectors are sent to into base station, so that base station carries out adding using the codebook vectors to the data for being sent to UE Power process, so as to reduce the channel time delay of each antenna port, improves codebook gain.
Processor 302 is additionally operable to perform following operation：
LS channel estimation is carried out according to descending pilot frequency, and latency measurement is carried out according to least square channel, obtained The channel time delay of each antenna port.
Processor 302 is additionally operable to perform following operation：
According to channel time delay calculate each target antenna port relative reference antenna port in each pilot tone on sub-carriers Phase shift, each target antenna port and reference antenna port constitute above-mentioned at least two antenna port；By the default vector of phase shift composition； Delay compensation is carried out to downgoing baseband channel according to default vector.
The user equipment (UE) in the embodiment of the present invention is described above with embodiment, below by embodiment this is introduced Base station in bright embodiment.
Fig. 5 is referred to, base station one embodiment includes in the embodiment of the present invention：
Sending module 401, for sending descending pilot frequency to user equipment (UE) by least two antenna ports；
Receiver module 402, for receiving the channel time delay of UE transmissions, channel time delay is UE according to the descending pilot frequency for receiving Latency measurement is carried out, the channel time delay of each antenna port for obtaining；
Processing module 403, for being entered to downgoing baseband channel according to channel time delay and the first codebook vectors for receiving Row delay compensation, obtains the second codebook vectors after delay compensation, the first codebook vectors be UE according to delay compensation after it is descending Baseband channel carries out what pre-coding matrix index PMI measurements were obtained.
In the present embodiment, processing module 403 is according to channel time delay and the first codebook vectors for receiving to downgoing baseband Channel carries out delay compensation, obtains the second codebook vectors after delay compensation, and processing module 403 can be using the second code book arrow Measuring the data to being sent to UE carries out precoding weighting process, so as to reduce the channel time delay of each antenna port, improves code This gain.
In some alternative embodiments of the present invention, above-mentioned processing module 403, specifically for calculating each according to channel time delay Phase shift of the target antenna port with respect to reference antenna port on each subcarrier, each target antenna port and reference antenna port set Into above-mentioned at least two antenna port；By the default vector of phase shift composition；Sweared according to default vector and the first code book for receiving Amount carries out delay compensation to downgoing baseband channel, obtains the second codebook vectors after delay compensation.
Further, above-mentioned processing module 403, specifically for generating according to equation below, target antenna port is relative to be referred to Phase shift of the antenna port on each subcarrier：
Wherein, TRXiFor target antenna port, TRX1For reference antenna port,It is target antenna port TRXiRelatively Reference antenna port TRX1Delay inequality, k for subcarrier numbering, NIFFTFor IFFT length, NTxRepresent the antenna port of base station Number.
Above-mentioned default vector is following vector：
Wherein, δkTo preset vector.
Further, above-mentioned processing module 403, specifically for obtaining the second code book after delay compensation by equation below Vector w'm(k)：
Wherein, ⊙ represents dot product, (δk)*Represent default vector deltakConjugation, wmThe first codebook vectors are represented,
Above the angle of slave module functional entity is described to the base station in the embodiment of the present invention, below from hardware The angle of process is described to the base station in the embodiment of the present invention, refers to Fig. 6, and the base station in the embodiment of the present invention includes： Emitter 501, receptor 502, processor 503 and memorizer 504.
The present embodiments relate to base station can have than more or less of part illustrated in fig. 6, can combine Two or more parts, or can have different parts to configure or set up, all parts can be including one or many Individual signal processing and/or special IC are realized in the combination of interior hardware, software or hardware and software.
Emitter 501 is used to perform following operation：
Descending pilot frequency is sent by least two antenna ports to user equipment (UE).
Receptor 502 is used to perform following operation：
The channel time delay that UE sends is received, channel time delay carries out latency measurement, obtains for UE according to the descending pilot frequency for receiving The channel time delay of each antenna port for arriving.
Processor 503 is used to perform following operation：
Delay compensation is carried out to downgoing baseband channel according to channel time delay and the first codebook vectors for receiving, when obtaining Prolong the second codebook vectors after compensation, the first codebook vectors carry out precoding for UE according to the downgoing baseband channel after delay compensation Matrix index PMI measurements are obtained.
Memorizer 504 is used to store the code needed for the execution corresponding operating of processor 502.
In the present embodiment, processor 503 is believed downgoing baseband according to channel time delay and the first codebook vectors for receiving Road carries out delay compensation, obtains the second codebook vectors after delay compensation, and processor 503 can use second codebook vectors pair Being sent to the data of UE carries out precoding weighting process, so as to reduce the channel time delay of each antenna port, improves code book increasing Benefit.
Processor 503 is additionally operable to perform following operation：
Relative phase shift of the reference antenna port on each subcarrier in each target antenna port, each mesh are calculated according to channel time delay Mark antenna port and reference antenna port constitute above-mentioned at least two antenna port；By the default vector of phase shift composition；According to default Vector and the first codebook vectors for receiving carry out delay compensation to downgoing baseband channel, obtain the second code after delay compensation This vector.
Those skilled in the art can be understood that, for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, will not be described here.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method can be with Realize by another way.For example, device embodiment described above is only schematic, for example, the unit Divide, only a kind of division of logic function can have other dividing mode, such as multiple units or component when actually realizing Can with reference to or be desirably integrated into another system, or some features can be ignored, or not perform.It is another, it is shown or The coupling each other for discussing or direct-coupling or communication connection can be the indirect couplings by some interfaces, device or unit Close or communicate to connect, can be electrical, mechanical or other forms.
The unit as separating component explanation can be or may not be it is physically separate, it is aobvious as unit The part for showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple On NE.Some or all of unit therein can according to the actual needs be selected to realize the mesh of this embodiment scheme 's.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit, it is also possible to It is that unit is individually physically present, it is also possible to which two or more units are integrated in a unit.Above-mentioned integrated list Unit both can be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If the integrated unit is realized using in the form of SFU software functional unit and as independent production marketing or used When, during a computer read/write memory medium can be stored in.Based on such understanding, technical scheme is substantially The part for contributing to prior art in other words or all or part of the technical scheme can be in the form of software products Embody, the computer software product is stored in a storage medium, including some instructions are used so that a computer Equipment (can be personal computer, server, or network equipment etc.) performs the complete of each embodiment methods described of the invention Portion or part steps.And aforesaid storage medium includes：USB flash disk, portable hard drive, read only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. are various can store journey The medium of sequence code.
The above, above example only to illustrate technical scheme, rather than a limitation；Although with reference to front State embodiment to be described in detail the present invention, it will be understood by those within the art that：It still can be to front State the technical scheme described in each embodiment to modify, or equivalent is carried out to which part technical characteristic；And these Modification is replaced, and does not make the spirit and scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution.

Claims (24)

1. a kind of delay compensation method, it is characterised in that include：
User equipment (UE) receives the descending pilot frequency that base station is sent by least two antenna ports；
The UE carries out latency measurement according to the descending pilot frequency, obtains the channel time delay of each antenna port；
When the channel time delay is sent to the base station by the UE, the UE is believed downgoing baseband according to the channel time delay Road carries out delay compensation, obtains the downgoing baseband channel after delay compensation；
The UE carries out pre-coding matrix index PMI measurements according to the downgoing baseband channel after the delay compensation, obtains code book Vector；
The codebook vectors are sent to the base station by the UE.
2. method according to claim 1, it is characterised in that the UE carries out latency measurement according to the descending pilot frequency, Obtaining the channel time delay of each antenna port includes：
The UE carries out LS channel estimation according to the descending pilot frequency, and carries out time delay according to the least square channel Measurement, obtains the channel time delay of each antenna port.
3. method according to claim 2, it is characterised in that the least square channel be frequency domain least square channel or Time domain least square channel.
4. the method according to any one of claims 1 to 3, it is characterised in that the UE is according to the channel time delay under Row baseband channel carries out delay compensation to be included：
The UE calculates the relative reference antenna port in each target antenna port and carries in son that each pilot tone is located according to the channel time delay Phase shift on ripple, each target antenna port and the reference antenna port constitute at least two antenna port；
Phase shift composition is preset vector by the UE；
The UE carries out delay compensation according to the default vector to downgoing baseband channel.
5. method according to claim 4, it is characterised in that the target antenna port is with respect to reference antenna port each Pilot tone phase shift on sub-carriers generate according to equation below：
δ l TRX i = 2 π k τ TRX i N I F F T , i = 2 , 3 , ... , N T x ;
Wherein, TRXiFor target antenna port, TRX1For reference antenna port,For phase shift,For target antenna port TRXiWith respect to reference antenna port TRX1Delay inequality, k is TRXiL-th pilot frequency locations place subcarrier numbering, NIFFTFor IFFT length, NTxRepresent the antenna port number of base station.
6. method according to claim 5, it is characterised in that the default vector is following vector：
Wherein, δlTo preset vector.
7. method according to claim 6, it is characterised in that the UE is according to the default vector to downgoing baseband channel Delay compensation is carried out, obtaining the downgoing baseband channel after delay compensation is：
Downgoing baseband channel H' after delay compensation is obtained by equation beloweff(l)：
Wherein, ⊙ represents dot product, heff,1L () represents the downgoing baseband channel before delay compensation, (δk) * represents default vector deltal's Conjugation.
8. a kind of delay compensation method, it is characterised in that include：
Base station sends descending pilot frequency by least two antenna ports to user equipment (UE)；
The base station receives the channel time delay that the UE sends, and the channel time delay is the UE described descending according to what is received Pilot tone carries out latency measurement, the channel time delay of each antenna port for obtaining；
The base station carries out time delay benefit according to the channel time delay and the first codebook vectors for receiving to downgoing baseband channel Repay, obtain the second codebook vectors after delay compensation, first codebook vectors are the UE according to after delay compensation Downgoing baseband channel carries out what pre-coding matrix index PMI measurements were obtained.
9. method according to claim 8, it is characterised in that the base station is according to the channel time delay and receives First codebook vectors carry out delay compensation to downgoing baseband channel, and obtaining the second codebook vectors after delay compensation includes：
The base station is according to the relative reference antenna port in each target antenna port of channel time delay calculating on each subcarrier Phase shift, each target antenna port and the reference antenna port constitute at least two antenna port；
The base station phase shift composition is preset into vector；
The base station carries out time delay benefit according to the default vector and the first codebook vectors for receiving to downgoing baseband channel Repay, obtain the second codebook vectors after delay compensation.
10. method according to claim 9, it is characterised in that the target antenna port exists with respect to reference antenna port Phase shift on each subcarrier is generated according to equation below：
δ k TRX i = 2 π k τ TRX i N I F F T , i = 2 , 3 , ... , N T x ;
Wherein, TRXiFor target antenna port, TRX1For reference antenna port,It is target antenna port TRXiIt is relative to refer to day Line end mouth TRX1Delay inequality, k for subcarrier numbering, NIFFTFor IFFT length, NTxRepresent the antenna port number of base station.
11. methods according to claim 10, it is characterised in that the default vector is following vector：
δ k = [ 1 e - jδ k TRX 2 ... e - jδ k TRX N T X ] ;
Wherein, δkTo preset vector.
12. methods according to claim 11, it is characterised in that the base station is according to the default vector and receives The first codebook vectors delay compensation is carried out to downgoing baseband channel, obtaining the second codebook vectors after delay compensation is：
The second codebook vectors w' after delay compensation are obtained by equation belowm(k)：
Wherein, ⊙ represents dot product, (δk) * represents default vector deltakConjugation, wmThe first codebook vectors are represented,
13. a kind of user equipment (UE)s, it is characterised in that include：
Receiver module, for receiving the descending pilot frequency that base station is sent by least two antenna ports；
First processing module, for carrying out latency measurement according to the descending pilot frequency, obtains the channel time delay of each antenna port；
First sending module, for the channel time delay to be sent to into the base station；
Second processing module, for when the channel time delay is sent to the base station by first sending module, according to institute State channel time delay carries out delay compensation to downgoing baseband channel, obtains the downgoing baseband channel after delay compensation；
3rd processing module, for carrying out pre-coding matrix index PMI surveys according to the downgoing baseband channel after the delay compensation Amount, obtains codebook vectors；
Second sending module, for the codebook vectors to be sent to into the base station.
14. UE according to claim 13, it is characterised in that the first processing module, specifically for according under described Row pilot tone carries out LS channel estimation, and carries out latency measurement according to the least square channel, obtains each antenna port Channel time delay.
15. UE according to claim 14, it is characterised in that the least square channel be frequency domain least square channel or Time domain least square channel.
16. UE according to any one of claim 13 to 15, it is characterised in that the Second processing module, specifically for According to the channel time delay calculate the relative reference antenna port in each target antenna port each pilot tone phase shift on sub-carriers, Each target antenna port and the reference antenna port constitute at least two antenna port；Phase shift composition is pre- If vector；Delay compensation is carried out to downgoing baseband channel according to the default vector.
17. UE according to claim 16, it is characterised in that the Second processing module, specifically for according to following public affairs Formula generate target antenna port with respect to reference antenna port each pilot tone phase shift on sub-carriers：
δ l TRX i = 2 π k τ TRX i N I F F T , i = 2 , 3 , ... , N T x ;
Wherein, TRXiFor target antenna port, TRX1For reference antenna port,For phase shift,For target antenna port TRXiWith respect to reference antenna port TRX1Delay inequality, k is TRXiL-th pilot frequency locations place subcarrier numbering, NIFFTFor IFFT length, NTxRepresent the antenna port number of base station.
18. UE according to claim 17, it is characterised in that the default vector is following vector：
δ l = [ 1 e - jδ l TRX 2 ... e - jδ l TRX N T x ] ;
Wherein, δlTo preset vector.
19. UE according to claim 18, it is characterised in that the Second processing module, specifically for by following public Formula obtains the downgoing baseband channel H' after delay compensationeff(l)：
Wherein, ⊙ represents dot product, heff,1L () represents the downgoing baseband channel before delay compensation, (δk) * represents default vector deltal's Conjugation.
20. a kind of base stations, it is characterised in that include：
Sending module, for sending descending pilot frequency to user equipment (UE) by least two antenna ports；
Receiver module, for receiving the channel time delay that the UE sends, the channel time delay is the UE according to the institute for receiving Stating descending pilot frequency carries out latency measurement, the channel time delay of each antenna port for obtaining；
Processing module, during for being carried out to downgoing baseband channel according to the channel time delay and the first codebook vectors for receiving Prolong compensation, obtain the second codebook vectors after delay compensation, first codebook vectors be the UE according to delay compensation after The downgoing baseband channel carries out what pre-coding matrix index PMI measurements were obtained.
21. base stations according to claim 20, it is characterised in that the processing module, specifically for according to the passage Phase shift of each target antenna port of time-delay calculation with respect to reference antenna port on each subcarrier, each target antenna port and The reference antenna port constitutes at least two antenna port；By the default vector of phase shift composition；According to described default Vector and the first codebook vectors for receiving carry out delay compensation to downgoing baseband channel, obtain the second code after delay compensation This vector.
In 22. set according to claim 21 you, it is characterised in that the processing module, specifically for according to as follows Formula generates phase shift of the target antenna port with respect to reference antenna port on each subcarrier：
δ k TRX i = 2 π k τ TRX i N I F F T , i = 2 , 3 , ... , N T x ;
Wherein, TRX is target antenna port, and TRX is reference antenna port,It is target antenna port TRXiIt is relative to refer to day Line end mouth TRX1Delay inequality, k for subcarrier numbering, NIFFTFor IFFT length, NTxRepresent the antenna port number of base station.
23. base stations according to claim 22, it is characterised in that the default vector is following vector：
δ k = [ 1 e - jδ k TRX 2 ... e - jδ k TRX N T X ] ;
Wherein, δkTo preset vector.
24. base stations according to claim 23, it is characterised in that the processing module, specifically for by equation below Obtain the second codebook vectors w' after delay compensationm(k)：
Wherein, ⊙ represents dot product, (δk) * represents default vector deltakConjugation, wmThe first codebook vectors are represented,
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