CN104104492B - A kind of enhanced method and apparatus of LTE system link - Google Patents
A kind of enhanced method and apparatus of LTE system link Download PDFInfo
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Abstract
The invention provides a kind of enhanced method and apparatus of LTE system link.Methods described includes：Communication terminal carries out spread processing for each Physical Resource Block on time-frequency domain, and the spread processing includes time domain spread processing and/or frequency domain spread spectrum is handled；Continuous multiple Transmission Time Intervals in time domain are bound, the same data block for transmitting upstream data, each Transmission Time Interval includes multiple Physical Resource Block after spread processing on frequency domain；The transmission of upstream data is carried out in time-domain resource after binding.The present invention can strengthen the coverage effect of upward signal, it is to avoid increase propagation delay time, reduce the complexity of data transfer.
Description
Technical field
The present invention relates to mobile communication technology field, the enhanced method of more particularly to a kind of LTE system link, Yi Jiyi
Plant the enhanced device of LTE system link.
Background technology
In LTE (Long Term Evolution, Long Term Evolution project) system, due to being limited to the communication terminal of user
Transmission power, if communication terminal be in relatively rugged environment (such as cell boarder), the uplink of the communication terminal
Quality is difficult to ensure that, is this frequently with HARQ (Hybrid Automatic Repeat Request, mixed automatic retransfer requirement)
Retransmission mode, the decoding rate of channel is improved by repeatedly sending the different redundancy versions of a transmission data block, to strengthen signal
The performance of covering.
In HARQ patterns, determine whether to carry out next re-transmission after the feedback of last time transmission is received, therefore biography can be increased
Defeated time delay, especially for MTC (Mobile Terminating Call, Mobile terminating call) business, according to wanting for 3GPP agreements
Ask, in order to expand the scope of covering, under FDD (Frequency Division Duplexing, FDD) pattern each
Channel data reduces 15dB, so that the coverage strength reduction of cell uplink signal, only leans on existing HARQ technologies here,
Reach that the effect of enhancing covering brings the complexity of very big processing delay and data transfer.
Therefore, a kind of new enhanced mechanism of LTE system link is also needed in actual applications to strengthen upward signal
Coverage effect, it is to avoid increase propagation delay time, reduces the complexity of data transfer.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of enhanced method of LTE system link, to strengthen up letter
Number coverage effect, it is to avoid increase propagation delay time, reduce data transfer complexity.
Present invention also offers a kind of enhanced device of LTE system link, to ensure the above method in practice should
With and realize.
In order to solve the above problems, the invention discloses a kind of enhanced method of LTE system link, including：
Communication terminal carries out spread processing for each Physical Resource Block on time-frequency domain, and the spread processing includes time domain
Spread processing and/or frequency domain spread spectrum processing；
Continuous multiple Transmission Time Intervals in time domain are bound, the same data block for transmitting upstream data,
Each Transmission Time Interval includes multiple Physical Resource Block after spread processing on frequency domain；
The transmission of upstream data is carried out in time-domain resource after binding.
Preferably, the communication terminal carries out spread processing for each Physical Resource Block on time-frequency domain includes：
The communication terminal is carried out at spread spectrum according to preset spreading factor for each Physical Resource Block on time-frequency domain
Reason；
Further, when the spread processing includes time domain spread processing and frequency domain spread spectrum processing, the communication terminal
Carrying out spread processing for each Physical Resource Block on time-frequency domain according to preset spreading factor includes：
Preset spreading factor is split as time domain spreading factor and the frequency domain spread spectrum factor, when the spreading factor is described
The product of domain spreading factor and the frequency domain spread spectrum factor；
Respectively according to each Physical Resource Block on the time domain spreading factor and the frequency domain spread spectrum factor pair frequency domain according to
Secondary progress time domain spread processing and frequency domain spread spectrum processing, or frequency domain spread spectrum processing and time domain spread processing are carried out successively.
Preferably, before the communication terminal carries out spread processing for each Physical Resource Block on time-frequency domain, institute
Stating method also includes：
Calculate path loss of the LTE signals between the communication terminal and the base station；
Determined to carry out corresponding spreading factor, the expansion in spread processing to the communication terminal according to the path loss
The frequency factor increases with the increase of the path loss；
Further, path loss of the calculating LTE signals between communication terminal and base station includes：
The communication terminal sends uplink reference signals to the base station, and receives the base station according to the up reference
The LTE signals that the transmission power of the Reference Signal Received Power of signal and the communication terminal is calculated are whole in the communication
Path loss between end and the base station；
Further, it is described to be determined to carry out corresponding spreading factor bag in spread processing to communication terminal according to path loss
Include：
According to the path loss and the predefined path loss and the signal coverage enhancement of the communication terminal
The mapping relations of grade, determine the signal coverage enhancement grade of the communication terminal；
The number of retransmissions set for the signal coverage enhancement grade is extracted, and the number of retransmissions is divided into waits to tie up
The number of fixed Transmission Time Interval and to the communication terminal carry out spread processing in corresponding spreading factor.
Preferably, it is described to be determined also to wrap corresponding spreading factor in communication terminal progress spread processing according to path loss
Include：
Calculate the base station to extend with maximum delay in the transmission channel of the communication terminal, and search for the maximum
The frequency domain spread spectrum factor that delay spread is set；
The frequency domain spread spectrum factor spread according to the spreading factor and to frequency domain, calculate time domain is spread when
Domain spreading factor；
Further, maximum delay extension includes in the transmission channel of the calculation base station and communication terminal：
The communication terminal carries out channel estimation in frequency domain according to the pilot signal received；
The estimated result to frequency domain channel will be obtained by inverse fast Fourier transform to the estimated result of frequency domain channel；
Power maximum diameter and the farthest footpath of time delay of the base station are determined according to the estimated result to frequency domain channel, and according to institute
Power maximum diameter and the farthest footpath of the time delay are stated, the base station and maximum delay in the transmission channel of the communication terminal is calculated
Extension.
Preferably, the transmission of upstream data is carried out in the time-domain resource after binding to be included：
The same data block of upstream data is transmitted using the multiple Transmission Time Intervals bound in the time-domain resource；
Whether receive the base station return is properly received the feedback message of upstream data, is not connect correctly if receiving
The feedback message of upstream data is received, then transmits the data block again.
Present invention also offers a kind of enhanced device of LTE system link, including：
Spread spectrum module, spread processing, the expansion are carried out for communication terminal for each Physical Resource Block on time-frequency domain
Frequency processing includes time domain spread processing and/or frequency domain spread spectrum processing；
Binding module, for being bound to continuous multiple Transmission Time Intervals in time domain, for transmitting upstream data
Same data block, each Transmission Time Interval includes multiple Physical Resource Block after spread processing on frequency domain；
Transport module, carries out the transmission of upstream data in the time-domain resource after binding.
Preferably, the spread spectrum module, time-frequency domain is directed to specifically for the communication terminal according to preset spreading factor
On each Physical Resource Block carry out spread processing；
Further, when the spread processing includes time domain spread processing and frequency domain spread spectrum processing, the spread spectrum module
Including：
Submodule is split, it is described for preset spreading factor to be split as into time domain spreading factor and the frequency domain spread spectrum factor
Spreading factor is the product of the time domain spreading factor and the frequency domain spread spectrum factor；
Secondary spread spectrum submodule, for respectively according to the time domain spreading factor and the frequency domain spread spectrum factor pair frequency domain
Each Physical Resource Block carry out successively time domain spread processing and frequency domain spread spectrum processing, or successively carry out frequency domain spread spectrum processing and when
Domain spread processing.
Preferably, described device also includes：
Loss calculation module, for calculating path loss of the LTE signals between the communication terminal and the base station；
Spreading factor determining module, for being determined to carry out in spread processing the communication terminal according to the path loss
Corresponding spreading factor, the spreading factor increases with the increase of the path loss；
Further, the loss calculation module, up reference is sent specifically for the communication terminal to the base station
Signal, and the base station is received according to the Reference Signal Received Power of the uplink reference signals and the hair of the communication terminal
Penetrate path loss of the LTE signals of power signal strength calculating between the communication terminal and the base station；
Further, the spreading factor determining module includes：
Grade determination sub-module, for being communicated according to the path loss and the predefined path loss with described
The mapping relations of the signal coverage enhancement grade of terminal, determine the signal coverage enhancement grade of the communication terminal；
Number extracting sub-module, for extracting the number of retransmissions set for the signal coverage enhancement grade；
Spreading factor calculating sub module, the number for the number of retransmissions to be divided into Transmission Time Interval to be bound
And corresponding spreading factor in spread processing is carried out to the communication terminal.
Preferably, the spreading factor determining module also includes：
Time-delay calculation submodule, expands for calculating the base station with maximum delay in the transmission channel of the communication terminal
Exhibition；
The frequency domain spread spectrum factor search submodule, for search for the maximum delay extend set frequency domain spread spectrum because
Son；
Time domain spreading factor searches submodule, for the frequency domain spread spectrum spread according to the spreading factor and to frequency domain
The factor, calculates the time domain spreading factor spread to time domain；
Further, the time-delay calculation submodule includes：
Channel estimation in frequency domain subelement, carries out frequency domain channel according to the pilot signal received for the communication terminal and estimates
Meter；
Time domain channel estimates subelement, for the estimated result to frequency domain channel to be obtained by inverse fast Fourier transform
To the estimated result of time domain channel；
Delay spread computation subunit, for determining that the power of the base station is maximum according to the estimated result to frequency domain channel
Footpath and the farthest footpath of time delay, and according to the power maximum diameter and the farthest footpath of the time delay, calculate the base station and communicated with described
Maximum delay extends in the transmission channel of terminal.
Preferably, the transport module includes：
Transmission of data blocks submodule, for up using the multiple Transmission Time Intervals transmission bound in the time-domain resource
The same data block of data；
Submodule is retransmitted, for receiving the feedback message for whether being properly received upstream data that the base station is returned, if
The feedback message for being not properly received upstream data is received, then transmits the data block again.
Compared with prior art, the present invention has advantages below：
According to the embodiment of the present invention, for uplink frequency domain resources each Physical Resource Block carry out time domain spread processing and/
Or frequency domain spread spectrum processing, the coverage effect of upward signal can be strengthened.Also, also spread processing is tied with TTI bundling phases
Close, it is ensured that the quality of uplink, further improve up covering, TTI bundling can reduce time of HARQ re-transmissions
Number, therefore processing delay can be reduced, reduce the complexity of data transfer.
Wherein, when being spread to Physical Resource Block, position that can also be according to where communication terminal is according to different
Spreading factor is spread, and spreading factor increases with communication terminal apart from the increase of the position of base station, so that being in
The communication terminal of cell boarder position can obtain more spreading gains, improve the communication terminal of cell boarder in up covering
Systematic function under limitation scene.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the enhanced embodiment of the method 1 of LTE system link of the invention；
Fig. 2 is a kind of flow chart of the enhanced embodiment of the method 2 of LTE system link of the invention；
Fig. 3 is a kind of structured flowchart of the enhanced device embodiment 1 of LTE system link of the invention；
Fig. 4 is a kind of structured flowchart of the enhanced device embodiment 2 of LTE system link of the invention.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is further detailed explanation.
Embodiment 1
With reference to Fig. 1, a kind of flow chart of the enhanced embodiment of the method 1 of LTE system link of the present invention is shown, specifically may be used
To comprise the following steps：
Step 101, communication terminal carry out spread processing for each Physical Resource Block on time-frequency domain, and spread processing includes
Time domain spread processing and/or frequency domain spread spectrum processing.
After communication terminal (UE) access LTE network, base station can select suitable time-frequency domain resources to distribute to UE, for carrying out
The transmission of upstream data.In the embodiment of the present invention, strengthened after being distributed after distributing base station ascending resource by spread processing
The coverage effect of upward signal, especially for the communication terminal in cell boarder position, can improve it in up covering
Systematic function under limitation scene.
Resource is carried out for smallest particles degree with Physical Resource Block (Radio Bear, RB) on frequency domain in current LTE system
Distribution, wherein, a RB includes multiple subcarriers (such as 12 subcarriers, a width of 15KHz of band of each subcarrier), 20MHz
Bandwidth amounts to be made up of 1200 sub- carrier waves, it is possible to is divided into 100 RB resources and is scheduled for using, each RB same moment
It can only once be used for a terminal scheduling.
In concrete implementation, can individually carry out time domain spread spectrum or frequency domain spread spectrum, can also successively respectively carry out time domain and
Frequency domain spread spectrum processing, wherein it is possible to first time domain spread spectrum frequency domain spread spectrum again, can also first frequency domain spread spectrum time domain is spread again, specific
Realization in, advanced row frequency domain spread spectrum again time domain spread spectrum can generally obtain preferably spread spectrum effect.
When carrying out frequency domain spread spectrum to each RB, each PRB is extended to NTIndividual PRB, when carrying out time domain spread spectrum to each RB, often
Individual PRB is extended to NFIndividual PRB, the spreading gain that can be obtained is 10log10 (NTNF)。
Step 102, continuous multiple Transmission Time Intervals in time domain are bound, for transmitting the same of upstream data
Data block, each Transmission Time Interval includes multiple Physical Resource Block after spread processing on frequency domain.
TTI (Transmission Time Interval, transmission have been further introduced into LTE R8 (version 8) standard
Time interval) bundling mechanism, TTI bundling mechanism is by non-self-adapting autonomous retransmission, i.e., to transmission data block not
It is transmitted, only the redundancy versions finally sent is just fed back, so as to reduce in continuous TTI with redundancy versions
The number of times that HARQ is retransmitted, reduces processing delay, reduces the complexity of data transfer, and by continuous T TI energy accumulation, carries
The high effect of upward signal covering.
In the embodiment of the present invention, spread processing is combined with TTI bundling, it is ensured that the quality of uplink, enters one
Step improves the effect of covering.
LTE system is divided in time domain with Transmission Time Interval (Transmission Time Interval, TTI), is
Refer to the length of an independent decoding transmission in Radio Link, each TTI includes multiple Physical Resource Block on frequency domain, at this
In inventive embodiments, the Physical Resource Block in each TTI passes through spread processing, it is however generally that, each TTI is 1ms, each RB
The temporal signatures of resource are 0.5ms, and each TTI includes 2 RB resources.
Specifically, base station can send dispatch to UE, and UE is determined continuously according to dispatch in member carrier
N number of Transmission Time Interval, and bind this N number of Transmission Time Interval, transmitted using multiple Transmission Time Intervals after binding same
One data block.
The transmission of upstream data is carried out in step 103, the time-domain resource after binding.
Carry out TTI binding after, can the enterprising row data of time-domain resource transmission.The embodiment of the present invention is also by spread processing
It is combined with TTI bundling, it is ensured that the quality of uplink, further improves up covering.
In summary, according to the embodiment of the present invention, time domain expansion is carried out for each Physical Resource Block of uplink frequency domain resources
Frequency processing and/or frequency domain spread spectrum processing, can strengthen the coverage effect of upward signal.Also, also by spread processing and TTI
Bundling is combined, it is ensured that the quality of uplink, further improves up covering, and TTI bundling can be reduced
The number of times that HARQ is retransmitted, therefore processing delay can be reduced, reduce the complexity of data transfer.
In one preferred embodiment of the invention, communication terminal is expanded for each Physical Resource Block on time-frequency domain
Frequency processing includes：
Communication terminal carries out spread processing according to preset spreading factor for each Physical Resource Block on time-frequency domain.
In the embodiment of the present invention, spreading factor can be pre-set, in the operation spread, is entered according to spreading factor
Row spread spectrum.
When spread processing includes time domain spread processing, according to preset spreading factor to for each physics on frequency domain
Resource block carries out time domain spread processing；When spread processing include frequency domain spread spectrum handle when, according to preset spreading factor to for
Each Physical Resource Block on frequency domain carries out frequency domain spread spectrum processing；When spread processing is included at time domain spread processing and frequency domain spread spectrum
During reason, communication terminal carries out spread processing according to preset spreading factor for each Physical Resource Block on time-frequency domain to be included：
Sub-step S11, preset spreading factor is split as time domain spreading factor and the frequency domain spread spectrum factor, spreading factor is
The product of time domain spreading factor and the frequency domain spread spectrum factor.
Sub-step S12, respectively according to each thing on the time domain spreading factor and the frequency domain spread spectrum factor pair frequency domain
Reason resource block carries out time domain spread processing and frequency domain spread spectrum processing successively, or carries out successively at frequency domain spread spectrum processing and time domain spread spectrum
Reason.
When being spread to time domain and frequency domain, spreading factor is split first, be able to will be spread previously according to actual demand
The factor is placed hereof after splitting, and then in spread spectrum, split result is read from file, can also be split immediately, preset
The rule of fractionation, for example, after splitting the ratio of time domain spreading factor and the ratio of the frequency domain spread spectrum factor in which scope, or when
The value of domain spreading factor or the frequency domain spread spectrum factor is more than some preset value etc..
In the embodiment of the present invention, it is preferable that the transmission of upstream data is carried out in the time-domain resource after binding to be included：
Sub-step S21, the same number using the multiple Transmission Time Intervals transmission upstream data bound in time-domain resource
According to block.
Sub-step S22, the feedback message for whether being properly received upstream data for receiving base station return, if receiving does not have
The feedback message of upstream data is properly received, then transmission data block again.
In the embodiment of the present invention, data can be transmitted using HARQ+TTI bundling, be transmitted by the multiple TTI bound
Same data block, and re-transmission is determined whether according to the message of base station feedback, the message of base station feedback includes two kinds, and one is correct
ACK (Acknowledgement, correct response) feedback signaling of upstream data is received, one is not to be properly received upstream data
NACK (Negative Acknowledgement, wrong responses) feedback signaling.
Specifically, transmitting N number of redundancy versions of same data block using the TTI after binding, base station receives N number of version
Merge laggard row decoding, ACK feedback signalings or NACK feedback signalings are sent to veto orientation UE according to successfully decoded.Send
ACK or NACK time location is determined according to the time location of last TTI in the TTI of binding；If UE receives NACK,
Need to retransmit N number of redundancy versions of data block, the time location of re-transmission according in the TTI of binding first TTI when
Between position determine.
The mode of re-transmission can at least include following three kinds：
The first, to the various versions in multiple redundancy versions of data block, according to the TTI of binding and data block version
Corresponding relation, determines the corresponding banding of version TTI, and the version is retransmitted using the TTI of determination, i.e. the weight of same version
Pass the TTI utilized identical with the TTI that initial transmission is utilized.
Second, to each version in multiple redundancy versions of data block, according to the TTI of binding and pair of data block version
It should be related to, determine the corresponding binding TTI of the version, tying up for determination is removed at least two up TTI of binding chosen using meaning
Determine other TTI outside TTI and retransmit the version.That is, the TTI that the TTI that the re-transmission of same version is utilized is utilized with initial transmission is not
Together.
The third, is entered using a binding TTI at least two binding TTI chosen to each version of data block
Row is retransmitted.
For the first and second of retransmission scheme, its common trait is using at least two binding TTI to data block
Multiple versions are retransmitted, therefore, as long as meeting the retransmission scheme of this feature, and be not limited to it is above-mentioned the first and second
The mode of kind.Multiple redundancy versions of data block are retransmitted using at least two binding TTI, can obtain terminal bigger
Frequency gain, so as to further improve up covering.
Retransmit many TTI connection that can be specifically sent using which kind of mode according to the retransmission scheme information being pre-configured with or base station
The retransmission scheme information that carries is closed in dispatch to determine.
For example, UE sends 3 redundancy versions of data block in continuous three TTI (No. 0 TTI, No. 1 TTI and No. 2 TTI)
This, the NACK feedback signalings that base station is sended over are being received with No. 2 TTI time interval for 4 TTI No. 6 TTI.Carrying out
When data are retransmitted, continuous 3 up TTI are chosen since K+2*HRAQ RTT TTI, and it is up using 3 chosen
TTI is retransmitted to 3 redundancy versions of data block, wherein, the numbering that K is first TTI in continuous three TTI, HRAQ
RTT is the time that hybrid automatic repeat-request comes and goes.
, can also be after above-mentioned binding when transmitting downlink data between base station and communication terminal in concrete implementation
Time-domain resource on carry out downlink data transmission.
Embodiment 2
With reference to Fig. 2, a kind of flow chart of the enhanced embodiment of the method 1 of LTE system link of the present invention is shown, specifically may be used
To comprise the following steps：
The path loss of step 201, calculating LTE signals between communication terminal and base station, and determined according to path loss
Corresponding spreading factor in spread processing is carried out to communication terminal, spreading factor increases with the increase of path loss.
From unlike last embodiment, in the present embodiment, can according to LTE signals and present communications terminal and base station it
Between the adaptive different size of spreading factor of distribution of path loss, it is possible to use different spreading factors, carry out time domain expansion
Frequency or frequency domain spread spectrum.
In the embodiment of the present invention, it is preferable that calculating path loss of the LTE signals between communication terminal and base station includes：
Sub-step S31, communication terminal send uplink reference signals to base station, and receive base station according to uplink reference signals
Path of the LTE signals that the transmission power of Reference Signal Received Power and communication terminal is calculated between communication terminal and base station
Loss.
Signal, can be lossy among the distance of transmission when being sent to base station from communication terminal, and LTE signals are whole in communication
Path loss between end and base station can be calculated according to uplink reference signals.
In the embodiment of the present invention, calculated by reference to signal (Reference Signal, RS), reference signal
Referred to as pilot signal, is the physical signalling that LTE protocol is defined, and is to be supplied to receiving terminal to be used for channel estimation or letter by transmitting terminal
A kind of signal of road detection, reference signal does not carry data in itself, for example, the up use Single Carrier Frequency Division Multiple Access of LTE
(Frequency Division Multiple Address, frequency division multiple access) technology, reference signal and upstream data are to use
TDM (Time-Division Multiplexing, time division multiplexing) mode is multiplexed together.In LTE system, UE is sent out to base station
Uplink reference signals are sent, uplink reference signals are divided into Sounding Reference Signal (SRS) and demodulated reference signal (DMRS) etc., base
Stand and send downlink reference signal to UE, downlink reference signal is divided into cell special reference (Cell-Specific
Reference Signal, CRS), UE DRS (Dedicated Reference Signal)s and MBSFN (Multicast Broadcast Single
Frequency Network, multicast single frequency network) DRS (Dedicated Reference Signal).
In the embodiment of the present invention, path loss PL be according to the Reference Signal Received Power of uplink reference signals (RSRP's
Estimate (PRSRP)) with and communication terminal transmission power Ptx_ueDifference, PL=Ptx_ue-P can be expressed asRSRP。
Path loss is related to the distance between communication terminal and base station, and the path of the communication terminal more remote apart from base station is damaged
Consumption is bigger, bigger for path loss, then needs to carry out more signal coverage enhancements.Therefore, in concrete implementation, spread spectrum
The factor can increase with the increase of path loss between communication terminal and base station, can band according to the size of spreading factor
Carry out different spreading gains.For the communication terminal nearer apart from base station, preferably, spreading factor can for the situation of LTE signals covering
With smaller, and for the communication terminal in cell boarder position, the location of its signal covering is poor, can distribute
Larger spreading factor, so that the communication terminal in cell boarder position can obtain more spreading gains, is improved
Systematic function of the communication terminal of cell boarder under up covering limitation scene.
Wherein, determining to carry out communication terminal corresponding spreading factor in spread processing according to path loss includes：
Sub-step S41, according to signal coverage enhancement of path loss and predefined path loss and communication terminal etc.
The mapping relations of level, determine the signal coverage enhancement grade of communication terminal.
Sub-step S42, the number of retransmissions set for signal coverage enhancement grade is extracted, and number of retransmissions is divided into treated
The number of the Transmission Time Interval of binding and to communication terminal carry out spread processing in corresponding spreading factor.
In the embodiment of the present invention, for different path loss, different signal coverage enhancement grades, example are pre-set
Such as, the mapping table between pre-set path loss and enhancing rank, and for different signal coverage enhancement grades, sets corresponding
Number of retransmissions, calculating to after path loss, search corresponding signal coverage enhancement grade, further search for corresponding again secondary
Number.It is in the embodiment of the present invention, path loss PL is of equal value into total number of retransmissions Nrep, relation between the two can be expressed as
Number of retransmissions is the number and the product of spreading factor of Transmission Time Interval to be bound in TTI bundling, can
So that further according to specific business demand and application environment, number of retransmissions to be divided into of Transmission Time Interval to be bound
Number and spreading factor, are expressed as Nrep=NTTIBunder_size*NSF, NTTIBunder_sizeIt is TTI Bunder size.In general,
TTIbunder will result in greatly very much and be repeated several times in time, in receiving terminal the multiple merging treatment of needs can be brought to bring big
Processing delay, thus need to need compromise to handle between TTI bunder and total spreading factor.Such as Nrep=64, here
NTTIBunder_size=8, NSF=8.
When spread spectrum includes time domain spread spectrum and during frequency domain spread spectrum, spreading factor is divided into the frequency domain spread spectrum factor and time domain spread because
Son, can set and divide according to specific demand, according to NSF=NT*NFIt is assured that time domain spreading factor NTExpand with frequency domain
The frequency factor, selection frequency spreading factor is greater than the value of time domain spreading factor (for example：Total spreading factor is if 8 (NF*NT=
8) N, is then selectedF=4, NT=2, more effectively to resist due to the frequency selective fading that multipath effect is brought.
It can also be determined to carry out corresponding spread spectrum in spread processing to communication terminal according to path loss as follows
The factor：
Maximum delay extends in sub-step S43, calculation base station and communication terminal transmission channel, and when searching for maximum
Prolong the frequency domain spread spectrum factor that extension is set.
Sub-step S44, the frequency domain spread spectrum factor spread according to spreading factor and to frequency domain, calculating are expanded time domain
The time domain spreading factor of frequency.
In the selection frequency domain spread spectrum factor, multipath transmisstion time delay is estimated, extended and determined according to the maximum delay of multipath transmisstion
Frequency domain expansion factor frequency domain spread spectrum factor NF, and then according to spreading factor NSF=NT*NF, by spreading factor divided by frequency domain spread spectrum because
Son obtains time domain spreading factor and is assured that time domain spreading factor NT。
In concrete implementation, different maximum delay extensions and the mapping relations of the frequency domain spread spectrum factor are pre-set, here
Maximum delay extension can be set as several different brackets, the different frequency domain spread spectrum factors of each grade correspondence.It is such as maximum
Delay spread is segmented into the several grades of 500ns/2000ns/5000ns/, and spreading factor 2/4/8 etc. is corresponded to respectively, obtains following
Mapping table.
More than simply lift simple case, in actual application, corresponding numerical value can be set according to the need for specific.
Wherein, maximum delay extension can include in the transmission channel of calculation base station and communication terminal：
Sub-step S43-1, communication terminal carry out channel estimation in frequency domain according to the pilot signal received；
Sub-step S43-2, the estimated result of frequency domain channel will be obtained to frequency domain channel by inverse fast Fourier transform
Estimated result；
Sub-step S43-3, basis determine power maximum diameter and the farthest footpath of time delay of base station to the estimated result of frequency domain channel,
And according to power maximum diameter and the farthest footpath of time delay, maximum delay extends in the transmission channel of calculation base station and communication terminal.
In the selection frequency domain spread spectrum factor, first have to estimate multipath transmisstion time delay, it is true according to the size of multipath transmisstion time delay
Make the size of the frequency domain spread spectrum factor.During estimating multipath transmisstion time delay, when base station receives business datum, by FFT
After (Fast Fourier Transformation, fast Fourier transform) conversion, frequency domain channel is carried out first with pilot signal
Estimation.
The estimated result of frequency domain channel is by IFFT (Inverse Fast Fourier Transform, quick anti-fourier
Conversion) it is transformed to the estimated result of time domain channel.According to the estimated result of time domain channel determine power maximum diameter (main footpath) and when
Prolong maximum diameter (farthest footpath) (please illustrate how to determine), herein, gone in channel estimation in frequency domain by IFFT conversion in time domain, meeting
Conditions of streaking is produced in end, this is due to that the signal that the points of FFT are caused with the inconsistent of IFFT point number is revealed, and is being estimated
This part trailing portion is not taken into account when meter maximum multipath time delay.
Further, it can determine that maximum delay extension (please be illustrated how really according to the position relationship in main footpath and farthest footpath
It is fixed), the frequency domain spread spectrum factor is determined according to different maximum delay extensions and the mapping table of the frequency domain spread spectrum factor.
Step 202, communication terminal are expanded according to preset spreading factor for each Physical Resource Block on time-frequency domain
Frequency is handled, and spread processing includes time domain spread processing and/or frequency domain spread spectrum is handled.
Step 203, binding is carried out to continuous multiple Transmission Time Intervals in time domain it is used to transmit the same of upstream data
Data block, each Transmission Time Interval includes multiple Physical Resource Block after spread processing on frequency domain.
The transmission of upstream data is carried out in step 204, the time-domain resource after binding.
According to the embodiment of the present invention, for uplink frequency domain resources each Physical Resource Block carry out time domain spread processing and/
Or frequency domain spread spectrum processing, the coverage effect of upward signal can be strengthened.Also, also spread processing is tied with TTI bundling phases
Close, it is ensured that the quality of uplink, further improve up covering, TTI bundling can reduce time of HARQ re-transmissions
Number, therefore processing delay can be reduced, reduce the complexity of data transfer.
Wherein, when being spread to Physical Resource Block, position that can also be according to where communication terminal is according to different
Spreading factor is spread, and spreading factor increases with communication terminal apart from the increase of the position of base station, so that being in
The communication terminal of cell boarder position can obtain more spreading gains, improve the communication terminal of cell boarder in up covering
Systematic function under limitation scene.
For embodiment of the method, in order to be briefly described, therefore it is all expressed as to a series of combination of actions, but this area
Technical staff should know that the present invention is not limited by described sequence of movement, because according to the present invention, some steps can
To carry out using other orders or simultaneously.Secondly, those skilled in the art should also know, described in this description to implement
Example belongs to preferred embodiment, and involved action and the module not necessarily present invention are necessary.
With reference to Fig. 3, a kind of structured flowchart of the enhanced device embodiment 1 of LTE system link of the present invention is shown, specifically
It can include with lower module：Spread spectrum module, 301 binding modules 302 and transport module 303.
Spread spectrum module 301, spread processing, spread spectrum are carried out for communication terminal for each Physical Resource Block on time-frequency domain
Processing includes time domain spread processing and/or frequency domain spread spectrum processing.
Binding module 302 is connected with spread spectrum module 301, and binding module 302 is used for continuous multiple transmission times in time domain
Interval is bound, the same data block for transmitting upstream data, and each Transmission Time Interval is on frequency domain comprising multiple
Physical Resource Block after spread processing.
Transport module 303 is connected with binding module 302, and transport module 303 is used to carry out in the time-domain resource after binding
The transmission of upstream data.
In the embodiment of the present invention, it is preferable that spread spectrum module, it is directed to specifically for communication terminal according to preset spreading factor
Each Physical Resource Block on time-frequency domain carries out spread processing.
In the embodiment of the present invention, it is preferable that when spread processing includes time domain spread processing and frequency domain spread spectrum processing, spread spectrum
Module includes：
Submodule is split, for preset spreading factor to be split as into time domain spreading factor and the frequency domain spread spectrum factor, spread spectrum
The factor is the product of time domain spreading factor and the frequency domain spread spectrum factor.
Secondary spread spectrum submodule is connected with splitting submodule, and secondary spread spectrum submodule is used for respectively according to time domain spreading factor
Time domain spread processing is carried out successively with each Physical Resource Block on frequency domain spread spectrum factor pair frequency domain and frequency domain spread spectrum is handled, or according to
Secondary progress frequency domain spread spectrum processing and time domain spread processing.
In the embodiment of the present invention, it is preferable that transport module includes transmission of data blocks submodule and retransmits submodule.
Wherein, transmission of data blocks submodule is connected with binding module 302, and transmission of data blocks submodule is used for using time domain money
The multiple Transmission Time Intervals bound on source transmit the same data block of upstream data.
Retransmit submodule be connected with transmission of data blocks submodule, retransmit submodule for receive base station return whether just
The feedback message of upstream data is really received, if receiving the feedback message for being not properly received upstream data, number is transmitted again
According to block.
According to the embodiment of the present invention, for uplink frequency domain resources each Physical Resource Block carry out time domain spread processing and/
Or frequency domain spread spectrum processing, the coverage effect of upward signal can be strengthened.Also, also spread processing is tied with TTI bundling phases
Close, it is ensured that the quality of uplink, further improve up covering, TTI bundling can reduce time of HARQ re-transmissions
Number, therefore processing delay can be reduced, reduce the complexity of data transfer.
With reference to Fig. 4, a kind of structured flowchart of the enhanced device embodiment 2 of LTE system link of the present invention is shown, specifically
It can include with lower module：Loss calculation module 401, spreading factor determining module 402, spread spectrum module 403, binding module 404
With transport module 405.
Loss calculation module 401, for calculating path loss of the LTE signals between communication terminal and base station.
Spreading factor determining module 402 is connected with loss calculation module 401, and spreading factor determining module 402 is used for basis
Path loss determines that spreading factor is with the increase of path loss to corresponding spreading factor in communication terminal progress spread processing
And increase.
Spread spectrum module 403 is connected with spreading factor determining module 402, spread spectrum module 403 specifically for communication terminal according to
Preset spreading factor carries out spread processing for each Physical Resource Block on time-frequency domain, and spread processing is included at time domain spread spectrum
Reason and/or frequency domain spread spectrum processing.
Binding module 404 is connected with spread spectrum module 403, and binding module 404 is used for continuous multiple transmission times in time domain
Interval carries out the same data block that binding is used to transmit upstream data, and each Transmission Time Interval includes multiple warps on frequency domain
Physical Resource Block after spread processing.
Transport module 405 is connected with binding module 404, and the biography of upstream data is carried out in the time-domain resource after binding
It is defeated.
In the embodiment of the present invention, it is preferable that loss calculation module sends up reference specifically for communication terminal to base station
Signal, and it is strong according to the Reference Signal Received Power of uplink reference signals and the transmission power signal of communication terminal to receive base station
Spend path loss of the LTE signals calculated between communication terminal and base station.
In the embodiment of the present invention, it is preferable that spreading factor determining module 402 includes grade determination sub-module, number and extracted
Submodule and spreading factor calculating sub module.
Grade determination sub-module is connected with loss calculation module 401, grade determination sub-module be used for according to path loss with
And the mapping relations of predefined path loss and the signal coverage enhancement grade of communication terminal, determine that the signal of communication terminal covers
Lid enhancing grade.
Number extracting sub-module is connected with grade determination sub-module, and number extracting sub-module is used to extract for signal covering
Strengthen the number of retransmissions that grade is set.
Spreading factor calculating sub module is connected with number extracting sub-module, and spreading factor calculating sub module is used for will re-transmission time
Number is divided into the number of Transmission Time Interval to be bound and carries out corresponding spreading factor in spread processing to communication terminal.
In the embodiment of the present invention, it is preferable that spreading factor determining module also include time-delay calculation submodule, frequency domain spread spectrum because
Son searches submodule and time domain spreading factor searches submodule.
Time-delay calculation submodule is connected with spreading factor calculating sub module, and time-delay calculation submodule is used for calculation base station with leading to
Believe that maximum delay extends in the transmission channel of terminal.
The frequency domain spread spectrum factor is searched submodule and is connected with time-delay calculation submodule, and the frequency domain spread spectrum factor, which searches submodule, to be used for
Search and extend the frequency domain spread spectrum factor set for maximum delay.
Time domain spreading factor is searched submodule and is connected with frequency domain spread spectrum factor lookup submodule, and time domain spreading factor searches son
Module is used for the frequency domain spread spectrum factor spread according to spreading factor and to frequency domain, calculates the time domain spread to time domain and expands
The frequency factor.
In the embodiment of the present invention, it is preferable that time-delay calculation submodule includes channel estimation in frequency domain subelement, time domain channel and estimated
Count subelement and delay spread computation subunit.
Channel estimation in frequency domain subelement is connected with spreading factor calculating sub module, and channel estimation in frequency domain subelement is used to communicate
Terminal carries out channel estimation in frequency domain according to the pilot signal received.
Time domain channel estimation subelement is connected with channel estimation in frequency domain subelement, and time domain channel estimation subelement is used for will be right
The estimated result of frequency domain channel obtains the estimated result to time domain channel by inverse fast Fourier transform.
Delay spread computation subunit is connected with time domain channel estimation subelement, and delay spread computation subunit is used for basis
Power maximum diameter and the farthest footpath of time delay of base station are determined to the estimated result of frequency domain channel, and according to power maximum diameter and time delay
Maximum delay extends in the transmission channel of farthest footpath, calculation base station and communication terminal.
In the embodiment of the present invention, it is preferable that spreading factor increases with communication terminal apart from the increase of the position of base station.
According to the embodiment of the present invention, for uplink frequency domain resources each Physical Resource Block carry out time domain spread processing and/
Or frequency domain spread spectrum processing, the coverage effect of upward signal can be strengthened.Also, also spread processing is tied with TTI bundling phases
Close, it is ensured that the quality of uplink, further improve up covering, TTI bundling can reduce time of HARQ re-transmissions
Number, therefore processing delay can be reduced, reduce the complexity of data transfer.
Wherein, when being spread to Physical Resource Block, position that can also be according to where communication terminal is according to different
Spreading factor is spread, and spreading factor increases with communication terminal apart from the increase of the position of base station, so that being in
The communication terminal of cell boarder position can obtain more spreading gains, improve the communication terminal of cell boarder in up covering
Systematic function under limitation scene.
Because said apparatus embodiment essentially corresponds to the embodiment of the method shown in earlier figures 1 and Fig. 2, therefore the present embodiment
Not detailed part, may refer to the related description in previous embodiment, does not just repeat herein in description.
The present invention can be used in numerous general or special purpose computing system environments or configuration.For example：Personal computer, service
Device computer, handheld device or portable set, laptop device, multicomputer system, the system based on microprocessor, top set
Box, programmable consumer-elcetronics devices, network PC, minicom, mainframe computer including any of the above system or equipment
DCE etc..
The present invention can be described in the general context of computer executable instructions, such as program
Module.Usually, program module includes performing particular task or realizes routine, program, object, the group of particular abstract data type
Part, data structure etc..The present invention can also be put into practice in a distributed computing environment, in these DCEs, by
Remote processing devices connected by communication network perform task.In a distributed computing environment, program module can be with
Positioned at including in the local and remote computer-readable storage medium including storage device.
Herein, term " comprising ", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, from
And cause the process, method, article or the equipment that include a series of key elements not only to include those key elements, but also including not bright
Other key elements really listed, or also include for this process, method, article or the intrinsic key element of equipment.Do not having
In the case of more limitations, the key element limited by sentence "including a ...", it is not excluded that the process including the key element,
Also there is other identical element in method, article or equipment.
Above to a kind of enhanced method of LTE system link provided by the present invention, and, a kind of LTE system link increases
Strong device is described in detail, and specific case used herein is explained the principle and embodiment of the present invention
State, the explanation of above example is only intended to the method and its core concept for helping to understand the present invention；Simultaneously for this area
Those skilled in the art, according to the thought of the present invention, will change, to sum up institute in specific embodiments and applications
State, this specification content should not be construed as limiting the invention.
Claims (10)
1. a kind of enhanced method of LTE system link, it is characterised in that including：
Calculate path loss of the LTE signals between communication terminal and base station；
According to the path loss determine to the communication terminal carry out spread processing in corresponding spreading factor, the spread spectrum because
Son increases with the increase of the path loss；
Communication terminal carries out spread processing for each Physical Resource Block on time-frequency domain, and the communication terminal is according to preset expansion
The frequency factor carries out spread processing for each Physical Resource Block on time-frequency domain；The spread processing includes time domain spread processing
And/or frequency domain spread spectrum processing；
Continuous multiple Transmission Time Intervals in time domain are bound, the same data block for transmitting upstream data, each
Transmission Time Interval includes multiple Physical Resource Block after spread processing on frequency domain；
The transmission of upstream data is carried out in time-domain resource after binding.
2. according to the method described in claim 1, it is characterised in that：
When the spread processing includes time domain spread processing and frequency domain spread spectrum processing, the communication terminal is according to preset spread spectrum
The factor carries out spread processing for each Physical Resource Block on time-frequency domain to be included：
Preset spreading factor is split as time domain spreading factor and the frequency domain spread spectrum factor, the spreading factor expands for the time domain
The product of the frequency factor and the frequency domain spread spectrum factor；
Enter successively according to each Physical Resource Block on the time domain spreading factor and the frequency domain spread spectrum factor pair frequency domain respectively
Row time domain spread processing and frequency domain spread spectrum processing, or frequency domain spread spectrum processing and time domain spread processing are carried out successively.
3. according to the method described in claim 1, it is characterised in that
Path loss of the calculating LTE signals between communication terminal and base station includes：
The communication terminal sends uplink reference signals to the base station, and receives the base station according to the uplink reference signals
Reference Signal Received Power and the communication terminal transmission power calculate the LTE signals the communication terminal with
Path loss between the base station；
Further, it is described to be determined to include corresponding spreading factor in communication terminal progress spread processing according to path loss：
According to the path loss and the predefined path loss and the signal coverage enhancement grade of the communication terminal
Mapping relations, determine the signal coverage enhancement grade of the communication terminal；
The number of retransmissions set for the signal coverage enhancement grade is extracted, and the number of retransmissions is divided into be bound
The number of Transmission Time Interval and to the communication terminal carry out spread processing in corresponding spreading factor.
4. method according to claim 3, it is characterised in that described to be determined to expand communication terminal according to path loss
Corresponding spreading factor also includes during frequency is handled：
Calculate the base station to extend with maximum delay in the transmission channel of the communication terminal, and search for the maximum delay
Extend the frequency domain spread spectrum factor set；
The frequency domain spread spectrum factor spread according to the spreading factor and to frequency domain, calculates the time domain spread to time domain and expands
The frequency factor；
Further, maximum delay extension includes in the transmission channel of the calculation base station and communication terminal：
The communication terminal carries out channel estimation in frequency domain according to the pilot signal received；
The estimated result to frequency domain channel will be obtained by inverse fast Fourier transform to the estimated result of frequency domain channel；
Power maximum diameter and the farthest footpath of time delay of the base station are determined according to the estimated result to frequency domain channel, and according to the work(
Rate maximum diameter and the farthest footpath of the time delay, calculate the base station and expand with maximum delay in the transmission channel of the communication terminal
Exhibition.
5. according to the method described in claim 1, it is characterised in that upstream data is carried out in the time-domain resource after binding
Transmission include：
The same data block of upstream data is transmitted using the multiple Transmission Time Intervals bound in the time-domain resource；
The feedback message for whether being properly received upstream data that the base station is returned is received, is not properly received if receiving
The feedback message of row data, then transmit the data block again.
6. a kind of enhanced device of LTE system link, it is characterised in that including：
Loss calculation module, for calculating path loss of the LTE signals between communication terminal and base station；
Spreading factor determining module, for being determined to carry out the communication terminal correspondence in spread processing according to the path loss
Spreading factor, the spreading factor increases with the increase of the path loss；
Spread spectrum module, is carried out at spread processing, the spread spectrum for communication terminal for each Physical Resource Block on time-frequency domain
Reason includes time domain spread processing and/or frequency domain spread spectrum processing；
Binding module, for being bound to continuous multiple Transmission Time Intervals in time domain, for transmitting the same of upstream data
Individual data block, each Transmission Time Interval includes multiple Physical Resource Block after spread processing on frequency domain；
Transport module, carries out the transmission of upstream data in the time-domain resource after binding.
7. device according to claim 6, it is characterised in that the spread spectrum module, is pressed specifically for the communication terminal
According to preset spreading factor spread processing is carried out for each Physical Resource Block on time-frequency domain；
Further, when the spread processing includes time domain spread processing and frequency domain spread spectrum processing, the spread spectrum module includes：
Submodule is split, for preset spreading factor to be split as into time domain spreading factor and the frequency domain spread spectrum factor, the spread spectrum
The factor is the product of the time domain spreading factor and the frequency domain spread spectrum factor；
Secondary spread spectrum submodule, for respectively according to every on the time domain spreading factor and the frequency domain spread spectrum factor pair frequency domain
Individual Physical Resource Block carries out time domain spread processing and frequency domain spread spectrum processing successively, or carries out frequency domain spread spectrum processing and time domain expansion successively
Frequency is handled.
8. device according to claim 6, it is characterised in that also include：
The loss calculation module, sends uplink reference signals, and receive institute specifically for the communication terminal to the base station
State base station strong according to the Reference Signal Received Power of the uplink reference signals and the transmission power signal of the communication terminal
Spend path loss of the LTE signals calculated between the communication terminal and the base station；
Further, the spreading factor determining module includes：
Grade determination sub-module, for according to the path loss and the predefined path loss and the communication terminal
Signal coverage enhancement grade mapping relations, determine the signal coverage enhancement grade of the communication terminal；
Number extracting sub-module, for extracting the number of retransmissions set for the signal coverage enhancement grade；
Spreading factor calculating sub module, for the number of retransmissions is divided into Transmission Time Interval to be bound number and
Corresponding spreading factor in spread processing is carried out to the communication terminal.
9. device according to claim 8, it is characterised in that the spreading factor determining module also includes：
Time-delay calculation submodule, extends for calculating the base station with maximum delay in the transmission channel of the communication terminal；
The frequency domain spread spectrum factor searches submodule, and the frequency domain spread spectrum factor set is extended for the maximum delay for searching；
Time domain spreading factor searches submodule, for the frequency domain spread spectrum that is spread according to the spreading factor and to frequency domain because
Son, calculates the time domain spreading factor spread to time domain；
Further, the time-delay calculation submodule includes：
Channel estimation in frequency domain subelement, channel estimation in frequency domain is carried out for the communication terminal according to the pilot signal received；
Time domain channel estimates subelement, during for by being obtained pair by inverse fast Fourier transform to the estimated result of frequency domain channel
The estimated result of domain channel；
Delay spread computation subunit, for according to the power maximum diameter that the base station is determined to the estimated result of frequency domain channel and
The farthest footpath of time delay, and according to the power maximum diameter and the farthest footpath of the time delay, calculate the base station and the communication terminal
Transmission channel in maximum delay extend.
10. device according to claim 6, it is characterised in that the transport module includes：
Transmission of data blocks submodule, for transmitting upstream data using the multiple Transmission Time Intervals bound in the time-domain resource
Same data block；
Submodule is retransmitted, for receiving the feedback message for whether being properly received upstream data that the base station is returned, if receiving
To the feedback message for being not properly received upstream data, then the data block is transmitted again.
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| ES2773506T3 (en) | 2015-06-25 | 2020-07-13 | Huawei Tech Co Ltd | Uplink data transmission method and apparatus |
| CN106603209B (en) * | 2015-10-16 | 2020-05-05 | 普天信息技术有限公司 | Data transmission method and device for time domain and frequency domain resource joint binding |
| CN107295660B (en) * | 2016-04-01 | 2020-09-04 | 中国移动通信有限公司研究院 | Resource scheduling and data detection method, device, related equipment and system |
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| CN101800572A (en) * | 2010-01-04 | 2010-08-11 | 新邮通信设备有限公司 | Method and system for transmitting uplink reference signal and user equipment |
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