CN103001732B - Transmission mode selection method, device and mobile terminal - Google Patents
Transmission mode selection method, device and mobile terminal Download PDFInfo
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Abstract
The invention discloses a kind of transmission mode selection method, device and mobile terminal.Wherein, the method includes the channel matrix in self adaptation transmission cycle in subframe is obtained by channel estimation；Ergodic capacity of each member carrier under different transmission mode and average error sign ratio in subframe is calculated using the channel matrix for obtaining；It is that each member carrier selects to meet the transmission mode combination of system transfer rate and system error sign ratio requirement according to the ergodic capacity for calculating and average error sign ratio.Present invention traversal on the premise of accidental channel calculates the ergodic capacity and average error sign ratio of each member carrier, consider requirement of the system to transfer rate and error sign ratio simultaneously, so as to the handling capacity of user is effectively increased on the premise of the correct transmission of user data is ensured, the spectrum efficiency of mobile terminal is maximised.
Description
Technical field
The present invention relates to LTE evolution technologies, especially, are related to a kind of transmission mode selection method, device and mobile terminal.
Background technology
Long Term Evolution (Long Term Evolution, LTE) system supports maximum 20MHz bandwidth, and downlink peak rates can
Up to 100Mbit/s, upstream peak speed is up to 50Mbit/s.Its follow-up evolution items (Long Term Evolution
Advanced, LTE-A) system support maximum 100MHz system bandwidths, it is desirable to downlink peak rates reach 1Gbit/s, up peak
Value speed reaches 500Mbit/s.In order to reach the bandwidth and peak-data rates demand of lte-a system, and consider existing frequency
The method of salary distribution and planning are difficult to find that whole section of frequency band for carrying lte-a system 100MHz bandwidth enough, and 3GPP adopts carrier aggregation
(Carrier Aggregation, CA) technology is by multiple LTE R compatible carrier waves the carrier wave of definition (LTE-8), i.e. member carrier
(Component Carrier, CC) connects into the transmission carrier wave of lte-a system.
So far, 3GPP RAN1 and RAN4 groups have determined that the polymerization of one-segment continuous carrier, one-segment are discontinuous
The 3 class prevailing scenarios such as carrier aggregation, the polymerization of multiband discontinuous carrier, corresponding member carrier are respectively with interior continuous load
Ripple, with interior discontinuous carrier, with outer discontinuous carrier.As frequency band residing for these member carriers is different, each CC is especially non-
Nature of radio propagation between continuous carrier is widely different, if so all carrier waves of a user all adopt identical to transmit
Pattern, can cause the mobile terminal (User Equipment, UE) under carrier aggregation scene to be difficult to match the channel shape of each CC
The problem of state.
Fig. 1 is that under LTE-A carrier aggregation scenes, media access control layer is illustrated with physical layer interface scheme in prior art
Figure.
As shown in figure 1, transmission block is cut in medium education (Medium Access Control, MAC) layer, each
The correspondingly independent hybrid automatic repeat-request of the transmission block of CC independences (Hybrid Automatic Repeat Request,
HARQ) entity, and each CC is independently modulated encoding scheme selection, it is seen that the channel status that UE has ready conditions according to each CC
Corresponding transmission mode is configured on each CC.
Huawei it is proposed that a kind of scheme of entitled Flexible CA/MIMO configuration, to meet LTE-A's
Peak-data rates demand, uses identical transmission mode on two member carriers of the program under carrier aggregation scene.The party
Case defines the UE of three kinds of new types for LTE-A.The up-downgoing maximum data rate of three classes UE can be configured by upper strata joint
Member carrier number/number of plies reach.Table 1 lists the possible CA/MIMO configurations of 3 kinds of UE types.
Table 1
For example, the up maximum data rate of R-10 UE Class1 is the twice of R-8 UE.This maximum data rate can
With on the premise of the number of plies is constant relative to R-8 UE by two bandwidth identical member carrier aggregation transfers or in transmission belt
The method that number of plies increase is R-8 twices is made to realize on the premise of width is constant, i.e. to be configurable to two one layer of CC aggregation transfers
Or the CC transmission of a two-layer, as shown in figures 2 a and 2b.
Wherein, Fig. 2 a show a case that 2 CC polymerizations, data flows of each CC using an antenna transmission independence；Figure
2b shows a case that 1 CC uses 2 antennas, by two antenna transmission, two independent data flows, in each data flow
Data it is all identical with the data correspondence in the data flow of each member carrier transmission in Fig. 2 a, so after baseband modulation
Transmission block entrained by data volume be single transmission block in Fig. 2 a twice.
The advantage of such scheme be evolved Node B (eNB) can according to the load of each CC and channel status and
Other systems situation is using the one kind in CA/MIMO configurations in table 1.It is still by taking Fig. 2 a and Fig. 2 b as an example, good for channel status
UE, eNB can adopt Fig. 2 b shown in scheme；And for the UE of cell edge, eNB can adopt the scheme shown in Fig. 2 a,
Think the user to distribute more frequency spectrum resources, so as to obtain higher data rate.
However, the program there is also it is clearly disadvantageous.Although the program ensure that LTE-A peak rates by carrier aggregation
Demand, but each CC is difficult to the channel status of each CC of matching using the configuration of identical transmission mode.
Fig. 3 is LTE-A closed loop transmission schematic diagrams.
As shown in figure 3, LTE-A downlink closed-loops are transmitted through up channel and periodically feed back being believed by the channel status of UE
Precoding matrix indicators (the Precoding Matrix that breath (Channel State Information, CSI) is obtained
Index, PMI) and order instruction (Rank Indicator, RI) realization.RI is the short-term transmission mode that UE recommends eNB.LTE-A
In transmission diversity correspond to RI=1, spatial reuse correspond to RI>1 (considers 2 Hes of transmission mode of LTE-A
Transmission mode 4, do not consider the Closed-Loop Spatial Multiplexing of RI=1).In the case of spatial reuse, RI values further refer to
The clear number of plies, namely the data fluxion of transmission.
The weak dependence of transmission diversity and spatial reuse utilization space channel, the selectivity in the former binding time/frequency
Transmission for signal provides more copies, to improve the reliability of signal transmission.The latter is in multiple separate space letters
Different data flows are transmitted on road, to improve the peak rate of data transfer, the data fluxion of its data rate size and transmission
It is closely related.In order that lte-a system is compromised between message transmission rate and reliability well, optimum transmission mode
Selection always is the focus of research.Many research institutions and company propose themselves selection criterion.For example, will receive
At machine, the minimum euclid distance of planisphere is used as open loop multiple-input and multiple-output (Multiple Input Multiple
Output, MIMO) technology (diversity and spatial reuse) switching criterion, additionally, there is scholar to propose based on difference on this basis
The statistics or the switching criterion of BER approximate solutions of the bit error rate (Bit Error Ratio, BER) generated under representative channel scene,
Furthermore it is also possible to the switching of transmission mode is realized based on maximum channel capacity.
MIMO mode allocation plan under existing carrier aggregation scene is less, and the motion of Huawei has certain representative
Property, although the motion can meet the transmission bandwidth and peak-rate requirements of LTE-AR-10, but still there is problems with：
(1) identical transmission mode is adopted in scheme on each CC, does not account for the difference of each CC channel status, typically
In the case of channel matrix is preferable, (for example, full rank) can meet transmission accuracy again using the transmission mode of spatial reuse
Speed can be improved；If conversely, residual order, spatial reuse can cause higher error rate, at this moment general using transmission diversity；
(2) in scheme, the starting point of various CA/MIMO configurations is to meet LTE-A peak-data rates demands, is not accounted for
The reliability of data transfer, that is, each CC cannot be corresponding according to the data-rate requirements of UE and target bit configuration
Transmission mode.
The content of the invention
The invention solves the problems that a technical problem be to provide a kind of transmission mode selection method, device and mobile terminal,
The spectrum efficiency of mobile terminal can be maximized on the premise of LTE-A downlink transmission rates and transmission accuracy is ensured.
According to an aspect of the invention, it is proposed that a kind of transmission mode selection method, including being derived from by channel estimation
Adapt to the channel matrix in subframe in transmission cycle；Using each member carrier in the channel matrix calculating subframe for obtaining in difference
Ergodic capacity and average error sign ratio under transmission mode；According to the ergodic capacity for calculating and average error sign ratio
Select to meet the transmission mode combination of system transfer rate and system error sign ratio requirement for each member carrier.
According to a further aspect in the invention, it is also proposed that a kind of transmission mode selection device, including channel matrix obtains single
Unit, for the channel matrix in self adaptation transmission cycle in subframe is obtained by channel estimation；Information process unit, with channel square
Battle array acquiring unit is connected, and in the channel matrix calculating subframe obtained for utilization, each member carrier is under different transmission mode
Ergodic capacity and average error sign ratio；And mode selecting unit, it is connected with information process unit, calculates for basis
Ergodic capacity and average error sign ratio select to meet system transfer rate and system error sign ratio for each member carrier
The transmission mode combination of requirement.
According to another aspect of the invention, it is also proposed that a kind of mobile terminal, which includes the transmission mould in previous embodiment
Formula selecting device.
Transmission mode selection method, device and mobile terminal that the present invention is provided, the traversal meter on the premise of accidental channel
The ergodic capacity and average error sign ratio of each member carrier are calculated, while system is considered to transfer rate and erratum number
The requirement of rate, so as to the handling capacity of user is effectively improved on the premise of the correct transmission of user data is ensured, maximises
The spectrum efficiency of mobile terminal.
Description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application.Attached
In figure：
Fig. 1 is that under LTE-A carrier aggregation scenes, media access control layer is illustrated with physical layer interface scheme in prior art
Figure.
Fig. 2 a show the process schematic diagram of 2 CC polymerizations.
Fig. 2 b show the process schematic diagram of 1 CC polymerization.
Fig. 3 is LTE-A closed loop transmission schematic diagrams.
Fig. 4 is downlink resource grid schematic diagram.
Fig. 5 is the schematic flow sheet of one embodiment of transmission mode selection method of the present invention.
Fig. 6 is Adaptive Transmission cycle schematic diagram.
Fig. 7 is the schematic flow sheet of another embodiment of transmission mode selection method of the present invention.
Fig. 8 be transmission mode selection method of the present invention another embodiment in UE downlink resource grid schematic diagrams.
Fig. 9 is the structural representation of one embodiment of transmission mode selection device of the present invention.
Figure 10 is the structural representation of another embodiment of transmission mode selection device of the present invention.
Figure 11 is the structural representation of the another embodiment of transmission mode selection device of the present invention.
Specific embodiment
With reference to the accompanying drawings the present invention is described more fully, wherein illustrating the exemplary embodiment of the present invention.This
The exemplary embodiment of invention and its illustrate for explaining the present invention, but do not constitute inappropriate limitation of the present invention.
It is illustrative below to the description only actually of at least one exemplary embodiment, never as to the present invention
And its application or any restriction for using.
Existing transmission mode selection criterion is broadly divided into two classes：The first kind is laid particular emphasis on the premise of transfer rate determines
Reduce error sign ratio；Equations of The Second Kind lays particular emphasis on the maximum channel capacity on the premise of transmission reliability is ensured.Existing Equations of The Second Kind
Channel capacity in selection criterion is mostly it is determined that be derived by the premise of channel, but actual channel is decline, letter
Road capacity is a stochastic variable.
When Doppler frequency shift is larger, channel is block decline or rapid fading, and channel capacity can be using ergodic capacity come table
Show.But ergodic capacity is on the premise of assuming that channel has ergodic theorem, to each channel on unlimited long period
Realize that corresponding channel capacity asks statistical average just obtain, cannot realize in real system.
Encoded on a subframe duration in view of lte-a system code word, the transmittability of system can be with one
Or the ergodic capacity in multiple subframes is representing.
The present invention does not account for each CC channel status for transmission mode configuration strategy under existing carrier aggregation scene
Problem, using average size as transmission mode switching standards, along with the constraint of average error sign ratio, it is proposed that LTE-A carrier waves
Adaptive Transmission model selection strategy under aggregation scene, the strategy can be maximum on the premise of data transmission credibility is ensured
Change the transfer rate of UE.
First, set up system model：
UE is assumed in the individual member carrier transmitting datas of F (F is positive integer), each member carrier is owned by independent RF chains
Road, system transfer rate are required as Rq, on each member carrier, the average error sign ratio of data transfer is no more than δ0。
Fig. 4 is downlink resource grid schematic diagram.
As shown in figure 4, f represents the member carrier numbering is polymerized by UE, each member carrier can include multiple subcarriers
(wherein, each subcarrier bandwidth can be 15khz, and the bandwidth of member carrier is generally 10MHz, 20MHz etc.), k is under LTE-A
Subcarrier number in row resource grid, KfTotal number of sub-carriers before representing included in f member carrier, KFRepresent that UE is used for
The total number of sub-carriers of data transfer, K0=0, Kf-Kf-1The sub-carrier number possessed by f-th member carrier is represented, l is one descending
OFDM symbol numbering in subframe, L represent the sum of OFDM symbol in a descending sub frame.
WithTransmission antenna number, the reception antenna number of the corresponding RF links of f-th member carrier of UE are represented respectively
And the member carrier correspondence RF links that UE is drawn by following Adaptive Transmission mode selecting methods in a upper radio frames
The transmission number of plies (that is, rank number), andWithAll it is positive integer,Kth in downlink resource grid
Downlink transfer of the individual subcarrier within l-th OFDM symbol cycle is represented by：
Wherein,
It is pre-coding matrix of k-th subcarrier within l-th OFDM symbol cycle,Represent pre-coding matrix
W(k,l),fIn the precoding factor, i.e., the data in b-th data flow are mapped to gain factor during a root transmission antennas.
It is channel matrix of k-th subcarrier within l-th OFDM symbol cycle,Represent channel matrix Η(k,l),f
In d roots transmission antenna to the channel gain between c root reception antennas.
Pre-coding matrix W in formula (1)(k,l),fFor the data flow on each layer is mapped to each antenna, orderFor equivalent channel matrix, then formula (1) can be expressed as：
Represent the data flow on each layer, ExIt is the average energy of each symbol,
x(k,l),fEnergy be
The receiving data vector at each reception antenna is represented,
It is the independent identically distributed complex value additive white Gaussian noise vector at each reception antenna, obeys distribution
Next, technology according to the present invention scheme introduces specific embodiment：
Fig. 5 is the schematic flow sheet of one embodiment of transmission mode selection method of the present invention.
As shown in figure 5, the embodiment may comprise steps of：
S502, mobile terminal by channel estimation obtain self adaptation transmission cycle in (for example, can for a LTE-A without
Line frame) channel matrix in subframe, wherein, in the transmission cycle, subframe can be the first half subframe of a radio frames, front
Several subframes or first subframe, the number for calculating the subframe of channel matrix need the operand for considering data, to ensure
Before next radio frames, base station and mobile terminal can know the transmission mode combination that self adaptation goes out, and meet the demand
In the case of can be using subframe as much as possible participating in computing, to improve the accurate of channel capacity and average error sign ratio
Property；
S504, calculates average letter of each member carrier under different transmission mode in subframe using the channel matrix for obtaining
Road capacity and average error sign ratio；
S506, selects to meet system for each member carrier according to the ergodic capacity for calculating and average error sign ratio
The transmission mode combination that transfer rate and system error sign ratio are required.
The embodiment travels through on the premise of accidental channel and calculates the ergodic capacity of each member carrier and averagely miss
Symbol rate, while consider requirement of the system to transfer rate and error sign ratio, so as to correctly transmit in guarantee user data
On the premise of effectively increase the handling capacity of user, maximise the spectrum efficiency of mobile terminal.
In an example, above-mentioned steps S504 can be embodied as：
The transmission of each member carrier is determined respectively according to the transmission antenna number and reception antenna number on each member carrier
The span of the number of plies, wherein, when the number of plies is transmitted equal to 1, the transmission mode adopted by correspondence member carrier is to send diversity
Mode；When the number of plies is transmitted more than 1, the transmission mode adopted by correspondence member carrier is for spatial multiplexing mode；
In the span of the transmission number of plies of each member carrier：
Average letter of each member carrier in each OFDM symbol of its subcarrier and subframe is calculated according to channel matrix
Road capacity；
The scope of the output signal-to-noise ratio of each member carrier is calculated according to channel matrix；
According to the average error sign ratio of range computation each member carrier of the output signal-to-noise ratio of each member carrier.
In another example, above-mentioned steps S506 can be embodied as：
Various transmission mode combinations are gone out according to the span permutation and combination of the transmission number of plies of each member carrier；
Judging whether a kind of ergodic capacity sum of each member carrier in the case where transmission mode is combined is more than or equal to is
System transmission rate request and judge whether the average error sign ratio of each member carrier in the case where this kind of transmission mode is combined is little
Require in system error sign ratio；
If the ergodic capacity sum of each member carrier is passed more than or equal to system under this kind of transmission mode combination
The average error sign ratio of defeated rate requirement and each member carrier is respectively less than system error sign ratio and requires, then by this kind of transmission
Pattern is defined as the transmission mode combination of each member carrier.
Further, when the transmission mode of each member carrier is combined as multiple, select the average of each member carrier
The maximum transmission mode of channel capacity sum is combined as the transmission mode combination of each member carrier.
Further, the transmission mode in each member carrier be combined as it is multiple, and each member carrier average letter
When road capacity sum is equal, in selecting each member carrier in various transmission mode combinations of each member carrier, maximum is flat
The minimum transmission mode of error sign ratio is combined as the transmission mode combination of each member carrier.
Next, as a example by for calculating first subframe of the subframe of channel matrix for radio frames, describing this in detail
Bright above-described embodiment implements process.
Fig. 6 is Adaptive Transmission cycle schematic diagram.
As shown in fig. 6, above-mentioned steps S502 are carried out in first sub- frame in of each radio frames, step S504 and step
S506 is carried out in the remaining nine sub- frame ins of the radio frames.
Fig. 7 is the schematic flow sheet of another embodiment of transmission mode selection method of the present invention.Below in conjunction with Fig. 4 and Fig. 7
The embodiment is illustrated together.
As shown in figs. 4 and 7, the embodiment may comprise steps of：
S702, receiver obtain the channel matrix H in the Adaptive Transmission cycle in first subframe by channel estimation.
Wherein, each element in H is a channel square for representing certain resource particle in downlink resource grid
Battle array, its line number and columns are respectively the reception antenna number and transmission antenna of the RF links corresponding to the member carrier of resource particle place
Number.
S704, calculates ergodic capacity of first sub- frame in each member carrier under different transmission mode according to H
(wherein, the upper limit of the channel capacity for transfer rate) and average error sign ratio.
S704a, in the current radio frames of calculating, the transmission number of plies of member carrier f correspondences RF links is
When, each member carrier is in the corresponding channel capacity in resource grid (k, l) place.
The transmission number of pliesChannel capacity spatially multipling channel capacity computing formula calculate：
The transmission number of pliesChannel capacity by send diversity channel capacity computing formula calculate：
Wherein, γ=Ex/N0It is the average signal-to-noise ratio at reception antenna.
S704b, counting each member carrier in the transmission number of plies isWhen ergodic capacity.
First, count ergodic capacity of each subcarrier in a subframe lengths.
Secondly, the ergodic capacity of the subcarrier included to each member carrier is sued for peace so as to obtain the flat of member carrier
Equal channel capacity：
S704c, ask each member carrier transmission the number of plies beWhen output signal-to-noise ratio model
Enclose.
Calculate the output noise of each resource particle (k, l) of each member carrier in first sub- frame in of transmission cycle
Than.
For spatial reuse, when receiving terminal adopts squeeze theorem, the output signal-to-noise ratio of n-th layer output data adopts following formula
Calculate：
Wherein,Represent data flow sum.It is pointed out that in the case of spatial reuse, receiving terminal can also be adopted
Other detection methods, corresponding output signal-to-noise ratio computing formula need to be adjusted correspondingly.
For transmission diversity, when receiving terminal is using maximum merging than receiving, output signal-to-noise ratio is calculated using following formula：
It is pointed out that in the case of transmission diversity, receiving terminal can also adopt additive method, corresponding output noise
Need to be adjusted correspondingly than computing formula.
Determine that each member carrier in the transmission number of plies is by result of calculationWhen output noise
Compare scope：
Wherein,
Wherein, X ∈ { ZF, div }, ZF represent that transmitting terminal adopts spatial reuse, receiving terminal to adopt squeeze theorem；Div is represented
Transmitting terminal is merged than detection using maximum using diversity, receiving terminal is sent.
S704d, is calculated as follows each member carrier and existsWhen average error sign ratio：
Wherein,It is condition error sign ratio of the sending signal using certain modulation system.For rectangle M-QAM,
Condition error sign ratio under fading channel is：
Wherein,M is number of constellation points,It isProbability density function, press
Formula is calculated：
Wherein, Γ () is Gamma functions,It is the order of diversity of receiver：
Formula (16), (17) are substituted into (15) and just can be tried to achieve
Next, the ergodic capacity of each member carrier tried to achieve and average error sign ratio are stored in following synopsis
In：
Table 2
Wherein,The permutation and combination of the transmission number of plies of line-up of delegates's carrier wave { 1 ..., f ..., F },Line-up of delegates's carrier wave 1 ..., f ..., F } in the transmission number of plies beWhen erratum
Number rate.
S706, is that each member carrier selects optimum transmission mode combination.
In order to ensure the transmission rate requirements of user, the ergodic capacity sum of each member carrier have to be larger than and be equal to
System transfer rate is required：
In addition, the reliability in order to ensure user data transmission, the average error sign ratio on each member carrier is all necessary
δ is constrained less than system error sign ratio0。
It is after the transmission mode combination of two above constraints is unsatisfactory in synopsis is eliminated, remaining in synopsis
In transmission mode combination, the transmission mode that selection makes UE channel capacities maximum is combined as the transmission mould under carrier aggregation scene
Formula；Further, if the channel capacity of multiple transmission modes combination is identical, the biography for selecting maximum average error sign ratio minimum
Defeated mode combinations are combined as the transmission mode under carrier aggregation scene.
Fig. 8 be transmission mode selection method of the present invention another embodiment in UE downlink resource grid schematic diagrams.
As shown in Figure 8, it is assumed that：
The aggregation transfer of (1) two member carrier, the bandwidth of two member carriers are 1.4MHz, herein only with 1.4MHz
As a example by illustrate, realize the bandwidth of each member carrier of carrier aggregation typically in more than 10MHz；
(2) relevant configuration according to LTE-A, two member carriers respectively possess 72 subcarriers；
(3) using the Cyclic Prefix of conventional configuration, a sub- frame in has 14 OFDM symbols；
The transmitting antenna of (4) two member carrier RF links is 2, and the reception antenna quantity of receiving terminal is also 2,
That is,
The embodiment specifically includes following steps：
Step one, receiver obtain the channel matrix H in the Adaptive Transmission cycle in first subframe by channel estimation：
Wherein, each element in H is the matrix of the row of 2 row 2, represents certain resource in downlink resource grid
The channel matrix of particle, for example, H(1,1),1(1, channel matrix 1), the resource particle belong on frequency domain to represent resource particle
Member carrier 1.
Step 2, as the dual-mode antenna number of each member carrier place transmission link is 2, so determining the transmission number of plies
Span be：Wherein, f=1,2.
The transmission number of pliesWhen correspondence spatial reuse, the channel capacity at resource particle (k, l) place calculated according to formula (6),
Wherein,W(k,l),fIt is pre-coding matrix, for the data flow on two layers is mapped to two transmittings
On antenna, it is the matrix of the row of 2 row 2, can tables look-up from LTE-A relevant criterion and obtain.
The transmission number of pliesWhen correspondence send diversity, the channel capacity at resource particle (k, l) place press formula (7) and is calculated.
Thus, we can obtain (the corresponding biography when transmission mode is to send diversity and spatial reuse of member carrier 1,2
The defeated number of plies is respectively 1 and 2) the channel capacity of the subcarrier that included on 14 OFDM symbol cycles, can be with four matrixes
It is expressed as follows：
Wherein, A1、A2、A3、A4Represent that the channel capacity of 1 each resource particle of member carrier, space are multiple when sending diversity respectively
The channel capacity of 1 each resource particle of used time member carrier, the channel capacity of 2 each resource particle of member carrier, sky when sending diversity
Between be multiplexed when 2 each resource particle of member carrier channel capacity.
Step 3, according to aforementioned formula (8) and (9) statistics channel capacity of the member carrier 1,2 under different transmission mode,
That is, to A1、A2、A3、A4Often row be averaging, then again by each row addition summation obtainRepresent respectively and send
The ergodic capacity of member carrier 1 when the ergodic capacity of member carrier 1, spatial reuse during diversity, when sending diversity into
Member carrier wave 2 ergodic capacity, spatial reuse when member carrier 2 ergodic capacity.
Step 4, the resource particle (k, l) included according to formula (10) and (11) calculating member carrier 1,2 are transmitted different
Output signal-to-noise ratio under pattern, equally can use four matrixes to represent：
Wherein, B1、B2、B3、B4The output signal-to-noise ratio of 1 each resource particle of member carrier, space when sending diversity are represented respectively
The output signal-to-noise ratio of 1 each resource particle of member carrier during multiplexing, when sending diversity 2 each resource particle of member carrier output noise
Than the output signal-to-noise ratio of 2 each resource particle of member carrier during, spatial reuse.B2、B4SubmatrixWithDifference table
Show the output signal-to-noise ratio received in two layer datas that machine testing is obtained.
Step 5, finds B1、B2、B3、B4In maximum and minima so as to draw member carrier 1,2 send diversity
With the scope of the respective output signal-to-noise ratio under space multiplexing mode, then substitute into formula (15) and obtain
Respectively represent send diversity when member carrier 1 average error sign ratio, spatial reuse when member carrier 1 average error sign ratio,
Send diversity when member carrier 2 average error sign ratio, spatial reuse when member carrier 2 average error sign ratio.
Step 6, by each member carrier tried to achieveWithIt is stored in following UE
In transmission mode combination synopsis：
Table 3
Step 7, is unsatisfactory for the transmission mode combination of system transfer rate requirement, it is assumed that exclude in excluding above-mentioned synopsis
Synopsis afterwards is：
Table 4
{ 1,1 } is combined in transmission mode, in { 2,1 }, the transmission mode combination for selecting UE channel capacities maximum.If two
The channel capacity of mode combinations is identical, comparesWithSize, select the two in smaller institute it is right
Transmission mode of the transmission mode combination answered as the next Adaptive Transmission cycle, and by uplink feedback to eNB.
It will appreciated by the skilled person that realizing that the whole and part steps of said method embodiment can pass through
Completing, aforesaid program can be stored in a computing device read/write memory medium the related hardware of programmed instruction, the journey
Sequence upon execution, performs the step of including said method embodiment, and two aforesaid storage mediums can include ROM, RAM, magnetic disc
It is various with CD etc. can be with the medium of store program codes.
Fig. 9 is the structural representation of one embodiment of transmission mode selection device of the present invention.
As shown in figure 9, the device 90 in the embodiment can include：
Channel matrix acquiring unit 91, for the channel square in self adaptation transmission cycle in subframe is obtained by channel estimation
Battle array, wherein, the subframe can be first half, former subframes or first subframe of a radio frames；
Information process unit 92, is connected with channel matrix acquiring unit 91, for utilizing the channel matrix for obtaining to calculate son
Frame in each member carrier ergodic capacity and average error sign ratio under different transmission mode；And
Mode selecting unit 93, is connected with information process unit 92, for according to the ergodic capacity peace for calculating
Error sign ratio is that each member carrier selects to meet the transmission mode combination of system transfer rate and system error sign ratio requirement.
The embodiment travels through on the premise of accidental channel and calculates the ergodic capacity of each member carrier and averagely miss
Symbol rate, while consider requirement of the system to transfer rate and error sign ratio, so as to correctly transmit in guarantee user data
On the premise of effectively increase the handling capacity of user, maximise the spectrum efficiency of mobile terminal.
Figure 10 is the structural representation of another embodiment of transmission mode selection device of the present invention.
As shown in Figure 10, the information process unit 101 in device 100 compared with the embodiment in Fig. 9, in the embodiment
Can include：
Transmission number of plies scope determination subelement 1011, for according to the transmission antenna number on each member carrier and reception day
Line number determines the span of the transmission number of plies of each member carrier respectively, wherein, when the number of plies is transmitted equal to 1, correspondence member
The transmission mode adopted by carrier wave is transmission diversity mode；When the number of plies is transmitted more than 1, the transmission adopted by correspondence member carrier
Pattern is spatial multiplexing mode；
With channel matrix acquiring unit 91 and transmission number of plies scope, ergodic capacity computation subunit 1012, determines that son is single
Unit 1011 is connected, for, in the span of the transmission number of plies of each member carrier, calculating each member according to channel matrix
Ergodic capacity of the carrier wave in each OFDM symbol of its subcarrier and subframe；
Output signal-to-noise ratio computation subunit 1013, with channel matrix acquiring unit 91 and transmission number of plies scope determination subelement
1011 are connected, for, in the span of the transmission number of plies of each member carrier, calculating each member according to channel matrix and carrying
The scope of the output signal-to-noise ratio of ripple；
Average error sign ratio computation subunit 1014, with transmission number of plies scope determination subelement 1011 and output signal-to-noise ratio meter
Operator unit 1013 is connected, in the span of the transmission number of plies of each member carrier, according to each member carrier
The average error sign ratio of range computation each member carrier of output signal-to-noise ratio.
Figure 11 is the structural representation of the another embodiment of transmission mode selection device of the present invention.
As shown in figure 11, the mode selecting unit in device 110 compared with the embodiment in Figure 10, in the embodiment
111 can include：
Combination subelement 1111, it is various for being gone out according to the span permutation and combination of the transmission number of plies of each member carrier
Transmission mode is combined；
Judgment sub-unit 1112, with combine subelement 1111 be connected, for judge a kind of transmission mode combination under each
Whether the ergodic capacity sum of member carrier is required more than or equal to system transfer rate, and judge in this kind of transmission mode
Whether the average error sign ratio of lower each member carrier of combination is respectively less than system error sign ratio requires；
Determination subelement 1113, is connected with judgment sub-unit 1112, if under the combination of this kind of transmission mode each
The ergodic capacity sum of member carrier more than or equal to system transfer rate require, and each member carrier average erratum
Number rate is respectively less than system error sign ratio and requires, then this kind of transmission mode is defined as the transmission mode combination of each member carrier.
In an example of device, determination subelement is additionally operable to meet system transfer rate requirement in each member carrier
When the transmission mode required with error sign ratio is combined as multiple, the ergodic capacity sum maximum of each member carrier is selected
Transmission mode is combined as the transmission mode combination of each member carrier.
In another example of device, determination subelement is additionally operable to meet system transfer rate requirement in each member carrier
The transmission mode required with error sign ratio is combined as that multiple, and the ergodic capacity sum of each member carrier is equal
When, in the various transmission modes combination of each member carrier, select maximum average error sign ratio in each member carrier minimum
Transmission mode is combined as the transmission mode combination of each member carrier.
Further, it is also possible to the transmission mode selection device in above-described embodiment is arranged in mobile terminal, can be effectively
Make channel condition information of the Release-10 mobile terminals according to each member carrier under LTE-A carrier aggregation scenes, movement
The transfer rate of demanding terminal and the constraint of average error sign ratio adaptively complete the choosing of the transmission mode on each member carrier
Select, namely the selection of RI, so as to maximize mobile terminal on the premise of mobile terminal transfer rate and transmission accuracy is ensured
Spectrum efficiency.
In this specification, each embodiment is described by the way of progressive, and what each embodiment was stressed is and which
The difference of his embodiment, between each embodiment, identical and similar part can be with cross-reference.For device embodiment
For, due to itself and embodiment of the method basic simlarity, so description is fairly simple, related part may refer to embodiment of the method
Partial explanation.
It is each that the above embodiment of the present invention fails Adaptive matching from transmission mode selection under existing carrier aggregation scene
The problem of member carrier channel status is started with, and considers system transfer rate requirement and transmission reliability requirement, changes existing
There is scheme that the way of channel capacity is calculated on the premise of it is assumed that channel is to determine channel, the calculating time on the premise of accidental channel
Capacity is gone through, and plus the restriction of error sign ratio, on the premise of ensureing that user data is correctly transmitted, effectively improves user's
Handling capacity.
Although being described in detail to some specific embodiments of the present invention by example, the skill of this area
Art personnel it should be understood that above example is merely to illustrate, rather than in order to limit the scope of the present invention.The skill of this area
Art personnel are it should be understood that can modify to above example without departing from the scope and spirit of the present invention.This
Bright scope is defined by the following claims.
Claims (17)
1. a kind of transmission mode selection method, it is characterised in that include：
Channel matrix in self adaptation transmission cycle in subframe is obtained by channel estimation；
Average letter of each member carrier under different transmission mode in the subframe is calculated using the channel matrix for obtaining
Road capacity and average error sign ratio；
Select to meet system for described each member carrier according to the ergodic capacity and average error sign ratio for calculating
The transmission mode combination that transfer rate and system error sign ratio are required.
2. transmission mode selection method according to claim 1, it is characterised in that the son in the Adaptive Transmission cycle
Frame is the first half of a radio frames.
3. transmission mode selection method according to claim 1, it is characterised in that described using the channel square for obtaining
Battle array calculates the step of ergodic capacity of each member carrier under different transmission mode and average error sign ratio in the subframe
Suddenly include：
The transmission number of plies of each member carrier is determined respectively according to the transmission antenna number and reception antenna number on each member carrier
Span；
In the span of the transmission number of plies of each member carrier：
According to the channel matrix is calculated, each member carrier is in each OFDM symbol of its subcarrier and the subframe
Ergodic capacity；
The scope of the output signal-to-noise ratio of each member carrier according to the channel matrix is calculated；
The average error sign ratio of each member carrier according to the range computation of the output signal-to-noise ratio of each member carrier.
4. transmission mode selection method according to claim 3, it is characterised in that when the transmission number of plies is equal to 1, right
The transmission mode adopted by member carrier is answered to send diversity mode.
5. transmission mode selection method according to claim 3, it is characterised in that when the transmission number of plies is more than 1, right
The transmission mode adopted by member carrier is answered for spatial multiplexing mode.
6. transmission mode selection method according to claim 3, it is characterised in that it is described average that the basis is calculated
Channel capacity and average error sign ratio select to meet system transfer rate and system error sign ratio need for described each member carrier
The step of transmission mode asked is combined includes：
Various transmission mode combinations are gone out according to the span permutation and combination of the transmission number of plies of each member carrier；
Judging whether a kind of ergodic capacity sum of each member carrier in the case where transmission mode is combined is more than or equal to is
System transmission rate request and whether judge the average error sign ratio of each member carrier described under the combination of this kind of transmission mode
Respectively less than system error sign ratio is required；
If the ergodic capacity sum of each member carrier is passed more than or equal to system under this kind of transmission mode combination
The average error sign ratio of defeated rate requirement and each member carrier is respectively less than system error sign ratio and requires, then by this kind
Transmission mode is defined as the transmission mode combination of each member carrier.
7. transmission mode selection method according to claim 6, it is characterised in that meet system in described each member carrier
When the transmission mode that system transmission rate request and error sign ratio are required is combined as multiple, the average of each member carrier is selected
The maximum transmission mode of channel capacity sum is combined as the transmission mode combination of each member carrier.
8. transmission mode selection method according to claim 7, it is characterised in that meet system in described each member carrier
System transmission rate request and error sign ratio require transmission mode be combined as it is multiple, and each member carrier average letter
When road capacity sum is equal, described each member carrier is selected in various transmission mode combinations of each member carrier
The minimum transmission mode of middle maximum average error sign ratio is combined as the transmission mode combination of each member carrier.
9. a kind of transmission mode selection device, it is characterised in that include：
Channel matrix acquiring unit, for the channel matrix in self adaptation transmission cycle in subframe is obtained by channel estimation；
Information process unit, is connected with the channel matrix acquiring unit, for utilizing the channel matrix for obtaining to calculate institute
State ergodic capacity of each member carrier under different transmission mode and average error sign ratio in subframe；And
Mode selecting unit, is connected with described information processing unit, for according to the ergodic capacity peace for calculating
Error sign ratio is that described each member carrier selects to meet the transmission mode of system transfer rate and system error sign ratio requirement
Combination.
10. transmission mode selection device according to claim 9, it is characterised in that in the Adaptive Transmission cycle
Subframe is the first half of a radio frames.
11. transmission mode selection devices according to claim 9, it is characterised in that described information processing unit includes：
Transmission number of plies scope determination subelement, for being distinguished according to the transmission antenna number on each member carrier and reception antenna number
Determine the span of the transmission number of plies of each member carrier；
Ergodic capacity computation subunit, with the channel matrix acquiring unit and the transmission number of plies scope determination subelement
It is connected, for, in the span of the transmission number of plies of each member carrier, calculating described each according to the channel matrix
Ergodic capacity of the individual member carrier in each OFDM symbol of its subcarrier and the subframe；
Output signal-to-noise ratio computation subunit, with the channel matrix acquiring unit and the transmission number of plies scope determination subelement phase
Even, in the span of the transmission number of plies of each member carrier, according to channel matrix calculating each
The scope of the output signal-to-noise ratio of member carrier；
Average error sign ratio computation subunit, calculates son with the transmission number of plies scope determination subelement and the output signal-to-noise ratio
Unit is connected, in the span of the transmission number of plies of each member carrier, according to each member carrier
The average error sign ratio of each member carrier described in the range computation of output signal-to-noise ratio.
12. transmission mode selection devices according to claim 11, it is characterised in that when the transmission number of plies is equal to 1,
The transmission mode adopted by correspondence member carrier is transmission diversity mode.
13. transmission mode selection devices according to claim 11, it is characterised in that when the transmission number of plies is more than 1,
The transmission mode adopted by correspondence member carrier is for spatial multiplexing mode.
14. transmission mode selection devices according to claim 11, it is characterised in that the mode selecting unit includes：
Combination subelement, the span permutation and combination for the transmission number of plies according to each member carrier go out various transmission
Mode combinations；
Judgment sub-unit, is connected with the subelement that combines, for judging described each member in the case where a kind of transmission mode is combined
Whether the ergodic capacity sum of carrier wave is required more than or equal to system transfer rate, and judge to combine in this kind of transmission mode
Whether the average error sign ratio of lower each member carrier is respectively less than system error sign ratio requires；
Determination subelement, is connected with the judgment sub-unit, if for described each member under this kind of transmission mode combination
The ergodic capacity sum of carrier wave more than or equal to system transfer rate require, and each member carrier average erratum
Number rate is respectively less than system error sign ratio and requires, then this kind of transmission mode is defined as the transmission mode group of each member carrier
Close.
15. transmission mode selection devices according to claim 14, it is characterised in that the determination subelement is additionally operable to
When described each member carrier meets the transmission mode of system transfer rate requirement and error sign ratio requirement and is combined as multiple, select
The maximum transmission mode of the ergodic capacity sum of each member carrier is combined as the transmission of each member carrier
Mode combinations.
16. transmission mode selection devices according to claim 15, it is characterised in that the determination subelement is additionally operable to
Described each member carrier meets the transmission mode of system transfer rate requirement and error sign ratio requirement and is combined as multiple, and institute
State each member carrier ergodic capacity sum it is equal when, in the various transmission modes combination of each member carrier
In each member carrier described in middle selection, the minimum transmission mode of maximum average error sign ratio is combined as described each member carrier
Transmission mode combination.
17. a kind of mobile terminals, it is characterised in that fill including the transmission mode selection any one of claim 9-16
Put.
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| CN104185206B (en) * | 2013-05-23 | 2019-02-12 | 中兴通讯股份有限公司 | A kind of switching method and device of transmission mode |
| EP3151458B1 (en) * | 2015-10-02 | 2019-03-20 | Mitsubishi Electric R&D Centre Europe B.V. | A method for determining features of an error correcting code system |
| CN107567049B (en) * | 2016-06-30 | 2021-04-20 | 中兴通讯股份有限公司 | Carrier aggregation throughput detection method and device |
| WO2018035866A1 (en) * | 2016-08-26 | 2018-03-01 | 华为技术有限公司 | Data sending method and apparatus |
| CN110572226B (en) * | 2019-07-15 | 2021-11-12 | 兰州理工大学 | Method for calculating average channel capacity of FTN transmission system under double-Gamma turbulent channel |
| CN110933708B (en) * | 2019-12-12 | 2021-02-26 | 北京邮电大学 | Resource allocation method and device for relay-assisted intelligent factory communication |
| WO2022016504A1 (en) * | 2020-07-24 | 2022-01-27 | Zte Corporation | Method for uplink transmission associated with antenna port and panel switching |
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