CN102014447A - Wireless communication method, terminal device, base station device and wireless communication system - Google Patents
Wireless communication method, terminal device, base station device and wireless communication system Download PDFInfo
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Abstract
In the wireless communication method of a wireless communication system in which wireless communication is conducted between a terminal device and a base station device, the base station device selects a first sending method or a second sending method according to the sending power of sending signals sent by the terminal device, and the terminal device sends the sending signals to the base station device according to the selected first or second sending method.
Description
The application is that the original bill application number is the application for a patent for invention (international application no: PCT/JP2008/000717 of No.200880128242.1, the dividing an application applying date: on March 25th, 2008, denomination of invention: wireless communications method, terminal installation, base station apparatus and wireless communication system).
Technical field
The present invention relates to wireless communications method, terminal installation, base station apparatus and wireless communication system.
Background technology
At present, at 3GPP (3
RdGeneration Partnership Project: third generation partner program), as the next generation wireless communication standard, studying LTE (Long Term Evolution or EvaluatedUTRA and UTRAN) (for example, following non-patent literature 1).
LTE adopts OFDM (Orthogonal FrequencyDivision Multiplexing: OFDM), adopting SC-FDMA (Single-Carrier Frequency Division Multiple Access: single-carrier frequency division multiple access) from the up link (Uplink) of terminal to base station in the down link from the base station to the terminal (Downlink).
OFDM is to be a plurality of subcarriers with band segmentation, the direct send mode that sends of mounting data in each subcarrier.On the other hand, SC-FDMA is with DFT (Discrete Fourier Transform: the discrete Fourier transform) send mode that sends to the subcarrier of the data mounting after the conversion.Figure 18 is the figure of structure example that the signal processing circuit of SC-FDMA is shown, and Figure 19 is the figure of structure example that the signal processing circuit of OFDM is shown.With reference to Figure 18 as can be known, (Discrete Fourier Transform: discrete Fourier transform) portion 101, and the signal after DFT handles is input to subcarrier mapping portion 102 successively, (InverseDiscrete Fourier Transform: inverse discrete Fourier transform) (Cyclic Prefix: Cyclic Prefix) insertion section 104 for portion 103 and CP for IDFT to comprise DFT before the subcarrier mapping.With reference to Figure 19 as can be known, send data and be imported into subcarrier mapping portion 111, and be imported into IDFT portion 112, CP insertion section 113 successively.
On the other hand, base station or terminal are used amplifier (amplifier) in order to send data.There is following problem in amplifier: thus when input power is big, can not keep the linearity data distortion.Out-of-band radiation power increases during data distortion.At ACLR (Adjacent carrier Leakage Ratio: adjacent carrier leak ratio) in the standard out-of-band radiation power has been stipulated higher limit (hereinafter to be referred as making " ACLR "), when data distortion is big, can not satisfy ACLR.
When considering ACLR, (Peak to Average Power Ratio: peak-to-average power ratio) lower SC-FDMA is favourable mode to PAPR, and in LTE, the SC-FDMA mode is applied to being derived from the up link of terminal.
Non-patent literature 1:3GPP TS 36.211V8.0.0 (2007-09)
Non-patent literature 2:Hikmet Sari, Geroges Karam, and Isabell Jeanclaude, " Transmission Techniques for Digital Terrestrial TV Broadcasting ", IEEECommunication Magazine, pp100-109, Feb.1995
SC-FDMA is favourable for PAPR, but owing to use continuous sub-carriers on frequency, therefore chooser carrier wave continuously on frequency, and when carrying out resource allocation etc., aspect scheduling, have restriction.In addition, as Figure 20 (for example non-patent literature 2), even under the situation of identical reception E/N, also be easy to generate mistake with respect to alternate manner.
Summary of the invention
Therefore, the object of the invention is to improve the unfavorable condition that is produced by the application of SC-FDMA.
Preferably, at this moment, to realize having considered the purpose that is improved as of dispatching flexibility or quality aspect.
According to a mode of the present invention, wireless communications method in a kind of wireless communication system is provided, in this wireless communication system, carry out radio communication between terminal installation and the base station apparatus, described wireless communications method is characterised in that to have following steps: described base station apparatus adopts MIMO to select the 1st send mode when signal sends to sending at described terminal installation, do not adopting MIMO to select the 2nd send mode to sending when signal sends, described terminal installation sends to described base station apparatus by selected described the 1st send mode or described the 2nd send mode with described transmission signal.
According to another mode of the present invention, a kind of terminal installation is provided, carry out radio communication between itself and the base station apparatus, this terminal installation is characterised in that, have: acceptance division, it receives send mode from described base station apparatus and selects information, and described send mode selects information representation to adopt MIMO to carry out selecting when signal sends the 1st send mode at described terminal installation, is not adopting MIMO to carry out selecting when signal sends the 2nd send mode; And sending part, it selects information according to described send mode, sends described transmission signal by described the 1st send mode or described the 2nd send mode to described base station.
According to another mode of the present invention, a kind of base station apparatus is provided, carry out radio communication between itself and the terminal installation, this base station apparatus is characterised in that, have: selection portion, it adopts MIMO to select the 1st send mode when signal sends to sending at described terminal installation, is not adopting MIMO to select the 2nd send mode when signal sends to sending; And sending part, its the send mode selection information that will represent selected described the 1st send mode or described the 2nd send mode sends to described terminal installation, and described terminal installation sends described transmission signal by selected described the 1st send mode or described the 2nd send mode.
According to another mode of the present invention, a kind of wireless communication system is provided, in this wireless communication system, carry out radio communication between terminal installation and the base station apparatus, this wireless communication system is characterised in that, described base station apparatus has: selection portion, and it adopts MIMO to select the 1st send mode when signal sends to sending at described terminal installation, is not adopting MIMO to select the 2nd send mode when signal sends to sending; And sending part, its send mode that sends selected described the 1st send mode of expression or described the 2nd send mode is selected information, and described terminal installation has: acceptance division, it receives described send mode and selects information; And sending part, it selects information according to described send mode, sends described transmission signal by described the 1st send mode or described the 2nd send mode to described base station.
According to another mode of the present invention, wireless communications method in a kind of wireless communication system that carries out radio communication between terminal installation and base station apparatus is provided, wherein, described base station apparatus is according to the transmitted power of the transmission signal that sends from described terminal installation, select the 1st send mode or the 2nd send mode, described terminal installation sends described transmission signal by the selected the described the 1st or the 2nd send mode to described base station apparatus.
In addition, according to another way of the present invention, wireless communications method in a kind of wireless communication system that carries out radio communication between terminal installation and base station apparatus is provided, wherein, described base station apparatus adopts MIMO to select the 1st send mode when signal sends to sending at described terminal installation, otherwise select the 2nd send mode, described terminal installation sends described transmission signal by the selected the described the 1st or the 2nd send mode to described base station apparatus.
In addition, according to another way of the present invention, the terminal installation that carries out radio communication between a kind of and the base station apparatus is provided, wherein, this terminal installation has: acceptance division, and the 1st send mode that the transmitted power of the transmission signal that it sends from described base station apparatus reception expression basis from described terminal installation is selected or the send mode of the 2nd send mode are selected information; And sending part, it selects information according to described send mode, sends described transmission signal by the described the 1st or the 2nd send mode to described base station apparatus.
In addition, according to another way of the present invention, the terminal installation that carries out radio communication between a kind of and the base station apparatus is provided, wherein, this terminal installation has: acceptance division, it receives send mode from described base station apparatus and selects information, and described send mode selects information representation to select the 1st send mode when described terminal installation adopts MIMO to send, otherwise selects the 2nd send mode; And sending part, it selects information according to described send mode, by the described the 1st or the 2nd send mode described transmission signal is sent to described base station.
In addition, according to another way of the present invention, the base station apparatus that carries out radio communication between a kind of and the terminal installation is provided, wherein, this base station apparatus has: selection portion, it selects any one of the 1st send mode or the 2nd send mode according to the transmitted power of the transmission signal that sends from described terminal installation; And sending part, its send mode selection information that will represent the selected the described the 1st or the 2nd send mode sends to described terminal installation, and described terminal installation sends described transmission signal by the selected the described the 1st or the 2nd send mode.
In addition, according to another way of the present invention, the base station apparatus that carries out radio communication between a kind of and the terminal installation is provided, wherein, this base station apparatus has: selection portion, it adopts MIMO to select the 1st send mode to sending when signal sends at described terminal installation, otherwise selects the 2nd send mode; And sending part, its send mode selection information that will represent the selected the described the 1st or the 2nd send mode sends to described terminal installation, and described terminal installation sends described transmission signal by the selected the described the 1st or the 2nd send mode.
In addition, according to another way of the present invention, a kind of wireless communication system that carries out radio communication between terminal installation and base station apparatus is provided, wherein, described base station has: selection portion, it selects the 1st send mode or the 2nd send mode according to the transmitted power of the transmission signal that sends from described terminal installation; And sending part, its send mode that sends expression the selected the described the 1st or the 2nd send mode is selected information, and described terminal installation has: acceptance division, it receives described send mode and selects information; And sending part, it selects information according to described send mode, sends described transmission signal by the described the 1st or the 2nd send mode to described base station.
In addition, according to another way of the present invention, a kind of wireless communication system that carries out radio communication between terminal installation and base station apparatus is provided, wherein, described base station has: selection portion, it selects 1st send mode to sending when signal sends by MIMO at described terminal installation, otherwise selects the 2nd send mode; And sending part, its send mode that sends expression the selected the described the 1st or the 2nd send mode is selected information, and described terminal installation has: acceptance division, it receives described send mode and selects information; And sending part, it selects information according to described send mode, sends described transmission signal by the described the 1st or the 2nd send mode to described base station.
In addition, according to another way of the present invention, provide a kind of wireless communication system that between terminal installation and base station, carries out radio communication, wherein, described base station or terminal installation have: modulation portion, and it can be corresponding with a plurality of transmission forms of selecting according to the size of transmitted power; And sending part, it sends the signal by described modulation portion modulation, and described a plurality of transmission forms comprise SC-FDMA mode and OFDM mode, along with the increase of transmitted power, carry out switching to from described OFDM mode the selection of described SC-FDMA mode.
According to the present invention, can improve the unfavorable condition that the application owing to SC-FDMA produces.
Description of drawings
Fig. 1 is the figure that the structure example of wireless communication system is shown.
Fig. 2 is the figure that the structure example of terminal installation is shown.
Fig. 3 is the figure that the structure example of base station apparatus is shown.
Fig. 4 is the figure that the example of MPR table is shown.
Fig. 5 is the sequential chart that the example of total body action is shown.
Fig. 6 illustrates the flow chart that send mode is determined the action example of processing.
Fig. 7 (A) and Fig. 7 (B) are the figure of example that the reduction amplitude of transmitted power is shown.
Fig. 8 illustrates the flow chart that send mode is determined another action example of processing.
Fig. 9 is the figure that the example of MPR table is shown.
Figure 10 illustrates the flow chart that send mode is determined another action example of processing.
Figure 11 is the figure that another structure example of base station apparatus is shown.
Figure 12 is the figure that another structure example of base station apparatus is shown.
Figure 13 illustrates the flow chart that send mode is determined another action example of processing.
Figure 14 illustrates the flow chart that send mode is determined another action example of processing.
Figure 15 is the figure that another structure example of terminal installation is shown.
Figure 16 is the figure that another structure example of base station apparatus is shown.
Figure 17 is the flow chart that another example of overall process is shown.
Figure 18 is the figure that the structure example of the signal processing circuit when utilizing SC-FDMA is shown.
Figure 19 is the figure that the structure example of the signal processing circuit when utilizing OFDM is shown.
Figure 20 is the curve chart that the characteristic example of SC-FDMA and OFDM is shown.
Symbol description:
1: wireless communication system; 10 (10-1～10-3): terminal installation; 11: the known signal acceptance division; 12: path loss calculation portion; 13: the transmitted power calculating part; 14: the known signal sending part; 15: Δ (maximum power-current power) sending part; 17: the scheduling sending part; 18: the send mode acceptance division; 19: data signal modulation portion; 20: the data-signal sending part; 50 (50-1～50-4): base station apparatus; 51: the known signal sending part; 52: Δ (maximum power-current power) acceptance division; 53: the dispatch request acceptance division; The 54:MPR table; 55: the send mode determination portion; 56: the send mode sending part; 57: data reception portion; 60: send the bit numerical table; 70: the network acceptance division.
Embodiment
Below explanation is used to implement best mode of the present invention.
[embodiment 1]
At first, describe at embodiment 1.Fig. 1 is the figure that the structure example of wireless communication system 1 is shown.Wireless communication system 1 has terminal installation (hereinafter referred to as " terminal ") 10-1～10-3 and base station apparatus (hereinafter referred to as " base station ") 50-1～50-4.Dotted line is represented the cell range of each base station 50-1～50-4.Terminal 10-1～10-3 can carry out radio communication with this base station 50-1～50-4 when being positioned at the sub-district.
Fig. 2 is the figure that the structure example of terminal 10 is shown, and Fig. 3 is the figure that the structure example of base station 50 is shown.Terminal 10 has known signal acceptance division 11, path loss calculation portion 12, transmitted power calculating part 13, known signal sending part 14, Δ (maximum power-current power) sending part (hereinafter referred to as the Δ sending part) 15, sends data buffer 16, dispatch request sending part 17, send mode acceptance division 18, data signal modulation portion 19 and data-signal sending part 20.
The known signal that known signal acceptance division 11 receives from base station 50, and output to path loss calculation portion 12.For example, the 50 regular known signals that send from the base station.
Path loss calculation portion 12 is according to known signal, to and base station 50 between the propagation path loss (path loss PL) of down link direction calculate, and the path loss PL that calculates is outputed to transmitted power calculating part 13.
Transmitted power calculating part 13 is according to calculating transmitted powers such as path loss PL.Calculate and use following formula.
[formula 1]
Herein, P
tBe data sending power according to the terminal 10 of the hypothesis on location of terminal 10, P
MaxBe the maximum transmit power of determining according to the ability of terminal 10, PL is a path loss, PL
X-ileAnd R
MinIt is the constant that is used for power control.Maximum transmit power P
MaxWith two constant P L
X-ile, R
MinFor example be stored in the memory, from memory they read, calculate with path loss PL from path loss calculation portion 12 by transmitted power calculating part 13.
Known signal sending part 14 for example regularly sends known signal to base station 50.
Sending 16 pairs of data buffers comes the transmission data of self-application portion etc. to store.
Dispatch request sending part 17 sends dispatch request to base station 50 when the transmission data are sent.17 pairs of dispatch request sending parts are stored in that the data volume that sends the transmission data in the data buffer 16 is calculated etc. and data volume or data rate are also contained in the dispatch request and send.
Send mode acceptance division 18 receives 50 send modes that send from the base station, and outputs to data signal modulation portion 19.
The transmission data are read from sending data buffer 16 by data signal modulation portion 19, and according to the send mode from send mode acceptance division 18, modulation sends data.
Transmission data after data-signal sending part 20 will be modulated send to base station 50.
On the other hand, as shown in Figure 3, base station 50 has known signal sending part 51, Δ (maximum power-current power) acceptance division (hereinafter referred to as the Δ acceptance division) 52, dispatch request acceptance division 53, MPR (Maximum PowerReduction: maximum power reduces) table 54, send mode determination portion 55, send mode sending part 56 and data reception portion 57.
Known signal sending part 51 for example regularly sends known signal to terminal 10.
Dispatch request acceptance division 53 receives the dispatch request of self terminal 10, and outputs to send mode determination portion 55.
Each value of MPR table 54 pair send mode (OFDM or SC-FDMA), modulation system (QPSK, 16QAM etc.), number of resource blocks (sub-carrier number that can distribute on frequency axis), reduction amount (hereinafter referred to as the transmitted power reduction) Pr that reduces from the maximum transmit power of terminal 10 is stored.
Fig. 4 is the figure that the example of MPR table 54 is shown.As shown in the drawing, the value of transmitted power reduction Pr is according to send mode, modulation system or number of resource blocks and difference.This is that transmitted power reduction Pr also gets different values because the transmission waveform that sends from terminal 10 according to send mode etc. and different, sends waveform accordingly with this.In addition, even identical modulation system and number of resource blocks, send mode not simultaneously, transmitted power reduction Pr is also different.This is that the PAPR of transmitted power is bigger because OFDM compares with SC-FDMA, reduces transmitted power in order to satisfy the ACLR needs.
Return Fig. 3, send mode determination portion 55 is according to the maximum of difference Δ and the transmitted power reduction Pr that reads from MPR table 54, selects and the send mode of definite OFDM or SC-FDMA.Definite processing will be narrated in the back.Send mode determination portion 55 is determined to handle when for example dispatch request acceptance division 53 receives dispatch request.
Send mode sending part 56 sends determined send mode.Terminal 10 sends (with reference to Fig. 2) according to this send mode to sending data.
Then, send mode is determined that the details of handling describes.Fig. 5 is the sequential chart that the example of overall process is shown, and Fig. 6 illustrates the flow chart that send mode is determined the example of processing.
At first, the known signal sending part 51 of base station 50 sends to terminal 10 (S10) with known signal.
Then, 13 couples of maximum transmit power P of the transmitted power calculating part of terminal 10
MaxTransmitted power P with the terminal 10 corresponding with the position
tBetween poor Δ calculate (S11).
Then, the dispatch request sending part 17 of terminal 10 sends dispatch request (S12).Δ sending part 15 sends the difference Δ in the timing that sends dispatch request.Δ sending part 15 also can output to dispatch request sending part 17 with the poor Δ that calculates, and dispatch request sending part 17 comprises poor Δ and sends in dispatch request.
Then, the send mode determination portion 55 of base station 50 is determined send mode (S13).
Then, handle and transfer to definite handle (Fig. 6) of send mode, the maximum of 55 pairs of transmitted power reductions of send mode determination portion Pr compares (S20) with the difference Δ.Then, send mode determination portion 55 is selected SC-FDMA (S21) when the maximum ratio Δ of transmitted power reduction Pr is big.On the other hand, send mode determination portion 55 is when or difference Δ one side identical with the difference Δ is bigger in the maximum of transmitted power reduction Pr, selection OFDM (S22).
In addition, also can be, when 50 transmitted powers that detect travelling carriage have surpassed predetermined threshold in the base station, select SC-FDMA, 50 transmitted powers that detect travelling carriage be selected OFDM than predetermined threshold hour in the base station.
With reference to Fig. 7 (A) and Fig. 7 (B) reason that so both is compared is described.Fig. 7 (A) is the example of the maximum ratio Δ of transmitted power reduction Pr when the longitudinal axis is made as transmitted power when big, and Fig. 7 (B) is the figure that its opposite example is shown.
As mentioned above, differing from Δ is the amplitude that the transmitted power corresponding with the position of terminal 10 reduces from maximum transmit power.On the other hand, transmitted power reduction Pr (maximum) thus be that linearity for the amplifier that satisfies terminal 10 satisfies ACLR (higher limit of out-of-band radiation power), the amplitude of having to reduce from maximum transmit power owing to the restriction of amplifier (maximum).Transmitted power reduction Pr (the maximum) situation (with reference to Fig. 7 (A)) that the ratio Δ is big is meant following situation: terminal 10 should adopt according to the position and reduce amplitude, ao and send, but since the restriction of amplifier need further additionally to reduce power and send.
Since the restriction of amplifier and further reduce situation that transmitted power sends be meant terminal 10 from the base station 50 situations far away.That is, as also illustrating in the prior art, OFDM compares with SC-FDMA, and its PAPR is bigger, therefore for linearity that satisfies amplifier and the standard that satisfies ACLR, compares with SC-FDMA, needs to reduce average transmitting power.When terminal 10 is positioned at from the base station 50 places far away,, adopt maximum transmit power to send data as far as possible in order to improve the receiving feature of base station 50.
But PAPR is bigger in OFDM, therefore in order to satisfy the linearity of amplifier, needs to reduce average transmitting power.If owing to OFDM needs to reduce transmitted power, when then adopting the higher SC-FDMA of average transmitting power to send, the receiving feature of base station 50 can be better.
Thus, because the restriction of amplifier and further reducing under the situation that transmitted power sends, when promptly the maximum ratio Δ of transmitted power reduction Pr is big (Fig. 7 (A)), send mode determination portion 55 selects SC-FDMA as send mode.
On the other hand, when difference Δ and transmitted power reduction Pr (maximum) are identical or bigger than it (Fig. 7 (B)), with the corresponding power in position reduce amplitude, ao with because the transmitted power reduction amplitude Pr that the restriction of amplifier causes (maximum) identical or bigger, transmitted power fully is reduced to the degree of the restriction of satisfying amplifier.In the time can reducing transmitted power thus,, in addition,, also in the scope of the linearity that satisfies amplifier, also satisfy ACLR even adopt the bigger OFDM of PAPR to send even under the nearer situation in base station 50, also data can be sent fully in terminal 10.
Therefore, when transmitted power was low, promptly transmitted power reduction Pr was identical with the difference Δ or than its hour, send mode determination portion 55 selection OFDM.By selecting OFDM, to compare with SC-FDMA, radio characteristics improves, and scheduling becomes flexibly.
In present embodiment 1, send mode determination portion 55 is read the maximum (in the example of Fig. 4, being 4.5dB) of transmitted power reduction Pr from MPR table 54.Perhaps, only the maximum of transmitted power reduction Pr is stored in the MPR table 54 as threshold value.Send mode determination portion 55 also can compare threshold value and difference Δ.
Return Fig. 5, the send mode sending part 56 of base station 50 is notified to terminal 10 (S14) with determined send mode.
The send mode modulation that the data signal modulation portion 19 of terminal 10 passes through to be notified sends data (S15).
Then, the data-signal sending part 20 of terminal 10 sends to base station 50 (S16) with data-signal.
Then, the data reception portion 57 of base station 50 is according to selected send mode demodulated data signal (S17).Then, a series of processing finish.
Like this, in the present embodiment, not to send data by SC-FDMA without exception in up link, send data and can for example switch to OFDM.OFDM is better than the radio characteristics of SC-FDMA, therefore with without exception compares by SC-FDMA transmission data conditions, can realize the improvement of radio characteristics.
In addition, in OFDMA, can also carry out on frequency axis, utilizing discontinuously the resource allocation scheduling of subcarrier, and send data conditions by SC-FDMA without exception and compare, can also guarantee the flexibility of dispatching.
Consequently, can also improve throughput.
In addition, in above-mentioned example, the transmitted power of sense terminals 10 surpasses the situation of predetermined threshold or the big situation of maximum Pr ratio Δ of transmitted power reduction in base station 50, but also can be that travelling carriage has send mode determination portion 55.
By differing from the send mode determination portion 55 that Δ or transmitted power itself are input to travelling carriage, determine send mode at travelling carriage from transmitted power calculating part 13.
That is to say, the send mode determination portion 55 of travelling carriage surpasses under the situation of predetermined threshold in the transmitted power that detects itself, or under the big situation of the maximum Pr ratio Δ that detects the transmitted power reduction, control data modulation portion 19 sends to use the SC-FDMA mode.
In addition, the send mode determination portion 55 of travelling carriage is lower than under the situation of predetermined threshold in the transmitted power that detects self, or under the little situation of the maximum Pr ratio Δ that detects the transmitted power reduction, control data modulation portion 19 sends to use the OFDM mode.
Preferably, before switching mode, the mode according to before switching sends to base station 50 with switching target mode (SC-FDMA mode or OFDM mode) from data-signal sending part 20, in base station 50, can also before switching, mode notify the switching target mode thus.Even under situation about not notifying, base station 50 also can receive the switching target mode that detects of handling at dual mode respectively.
In addition, can also enumerate the embodiment of the position of transposing base station and travelling carriage.
[embodiment 2]
The structure of the general structure of wireless communication system 1, terminal 10 and base station 50 and embodiment are 1 identical (with reference to Fig. 1～Fig. 3).In addition, up to base station 50 till the terminal 10 receiving scheduling requests (S12 of Fig. 5) all identical with embodiment 1.
When the dispatch request of having imported from dispatch request acceptance division 53, send mode determination portion 55 is carried out send mode and is determined to handle (S13).
Fig. 8 illustrates the flow chart that send mode is determined the action example of processing, and Fig. 9 is the figure that the example of MPR table 54 is shown.
Send mode determination portion 55 is selected (S31) according to determined form (modulation system and number of resource blocks) when selecting send mode (S30).
For example, send mode determination portion 55 definite forms that modulation system are made as " 16QAM ", number of resource blocks are made as " 1 ".Send mode determination portion 55 is read corresponding project from MPR table 54.Fig. 9 is the example that respective items purpose MPR table 54 is shown.Then, send mode determination portion 55 is read the transmitted power reduction Pr of OFDM mode in the corresponding project.In the example of Fig. 9 be " 3 ".The transmitted power reduction Pr (=" 3 ") of the OFDM that send mode determination portion 55 is relatively read and difference Δ, similarly to Example 1, when transmitted power reduction Pr ratio Δ is big, select SC-FDMA, when transmitted power reduction Pr is identical or lower than it with the difference Δ, select OFDM (S32).Later on identical with embodiment 1.
Send mode determination portion 55 is read transmitted power reduction Pr among OFDM and these two transmitted power reduction Pr of SC-FDMA, OFDM, and its reason is because big than SC-FDMA of the power extraction amount Pr of OFDM, with the stricter side of condition as benchmark.
In addition, in present embodiment 2, the definite of form can not carry out in send mode determination portion 55 yet, and determined by dispatch request acceptance division 53.At this moment, dispatch request acceptance division 53 outputs to send mode determination portion 55 with determined form, and send mode determination portion 55 is carried out above-mentioned processing according to form.
[embodiment 3]
Then embodiment 3 is described.In present embodiment 3, also consider to send bit number with respect to embodiment 2 and select send mode.
The structure of the wireless communication system 1 of present embodiment 3, terminal 10 and base station 50 is identical with embodiment 1.But send mode determination portion 55 determines that the power corresponding with sending bit number reduces amplitude, ao 1.Determine for example also can followingly to carry out: in send mode determination portion 55, have the table of the reduction amplitude, ao 1 corresponding, read the reduction amplitude, ao 1 corresponding and determine with sending bit number with sending bit number.Perhaps, also can be that send mode determination portion 55 is used for calculating reduction amplitude, ao 1 according to this calculating formula and determining according to sending the calculating formula that bit number calculates the reduction amplitude in storage inside.Perhaps, also can be also to have the bit of transmission numerical table 60 as shown in Figure 11, send mode determination portion 55 is read the reduction amplitude, ao 1 corresponding with sending bit number.
Figure 10 is the flow chart that the definite example of handling of send mode in the present embodiment 3 is shown.It is all identical till base station 50 receives dispatch request with embodiment 1.
Send mode determination portion 55 is when dispatch request acceptance division 53 has been imported dispatch request, determine that according to the transmission bit number that is included in the dispatch request power reduces amplitude, ao 1 (S41), select the send mode (S40, S42) corresponding similarly to Example 2 with form.
In addition, send mode determination portion 55 is selected SC-FDMA when the power extraction amount Pr of OFDM is bigger than reduction amplitude (Δ+Δ 1), otherwise selects OFDM (S43).In other words, data volume is few and can select OFDM so that fully low transmitted power send sending, otherwise selects SC-FDMA.Later processing is identical with embodiment 1.
In addition, in present embodiment 3, except that sending bit number, also can be encoding rate.In sending bit numerical table 60, store the reduction amplitude, ao 1 corresponding with encoding rate.When receiving dispatch request, dispatch request acceptance division 53 determines encoding rate and outputs to send mode determination portion 55 that send mode determination portion 55 is read the reduction amplitude, ao corresponding with encoding rate 1 from table 60 and determined send mode.
[embodiment 4]
This indication also is known as overload indicator (Overload Indicator), and it is that transmitted power when terminal 10 is bigger, and the terminal of other sub-district is produced when disturbing, and is used to reduce the indication of the transmitted power of terminal 10.
The structure of wireless communication system 1 and terminal 10 is identical with embodiment 1.Figure 12 is the figure that the structure example of base station 50 is shown.As shown in the drawing, base station 50 has network acceptance division 70, can be via the indication (overload indicator) of network reception from other base station.
Figure 13 illustrates the flow chart that send mode is selected the example of processing.Processing (S12 of Fig. 5) till the 50 receiving scheduling requests of base station is all identical with embodiment 1 etc.
Then, network acceptance division 70 is when receiving indication from other base station, and the output power corresponding with this indication reduces amplitude, ao 2 (S50).Network acceptance division 70 for example has table in inside, reads corresponding reduction amplitude, ao 2 and output.
Send mode determination portion 55 is determined form (S52) similarly to Example 2, reads corresponding project from MPR table 54, and the transmitted power reduction Pr of reduction amplitude (Δ+Δ 2) with OFDM compared, thereby determines send mode (S51, S53).
That is, send mode determination portion 55 is selected SC-FDMA when the power extraction amount Pr of OFDM is bigger than reduction amplitude (Δ+Δ 2), otherwise selects OFDM (S53).In other words, in the time can sending with abundant low transmitted power, select OFDM, otherwise select SC-FDMA according to indication.Later processing is identical with embodiment 1 etc.
[embodiment 5]
Then embodiment 5 is described.Whether present embodiment 5 is to be MIMO (Multiple-Input Multiple-Output: multiple-input and multiple-output) send the example of determining send mode according to terminal 10.
MIMO is following mode: for example receive the transmission signal that sends from many transmitting antennas with 1 reception antenna, synthesize in the mode of offsetting received signal, thereby obtain sending signal.MIMO is used for receiving SIR (Signalto Interference Ratio: further obtain throughput under signal-to-jamming ratio) the good environment.
But, under situation about sending,, but can not eliminate between stream and disturb owing to this frequency equalizer in receiver side frequency of utilization equalizer processes received signal by SC-FDMA.Therefore, there are the following problems: produce contradiction in interference and the multipath interference weight coefficient separately between the stream of MIMO, the characteristic of received signal is deterioration on the contrary.
On the other hand, about OFDM, because receiver side does not need the frequency of utilization equalizer, subcarrier is quadrature also, therefore disturb no matter in the processing procedure of received signal, use what kind of weight coefficient can not produce multipath, be used to eliminate the weight coefficient that disturbs between the stream of MIMO and receive thereby can use.
Thus, the send mode determination portion 55 of present embodiment 5 is selected OFDM when MIMO sends, and selection SC-FDMA when not being the MIMO transmission (S60 of Figure 14～S62).
Whether the dispatch request sending part 17 of terminal 10 comprises expression in dispatch request be that the information that MIMO sends sends.Send mode determination portion 55 is read this information from dispatch request, thereby determines that send mode gets final product.
Under the situation that MIMO sends, adopt OFDMA to send data from terminal 10, therefore to compare with the situation that adopts SC-FDMA to send, the radio characteristics of received signal can deterioration.
[embodiment 6]
Figure 15 illustrates the structure example of terminal 10, and Figure 16 illustrates the structure example of base station 50, and Figure 17 illustrates the sequential chart of overall process.In present embodiment 6, owing in base station 50, differ from the calculating of Δ, so known signal acceptance division 11, path loss calculation portion 12 and transmitted power calculating part 13 are arranged in the base station 50.
The known signal sending part 14 of terminal 10 sends to base station 50 (S70) with known signal.
Then, the known signal acceptance division 11 of base station 50 receives this known signal, and maximum transmit power P is calculated in transmitted power calculating part 13 uses (formula 1) etc.
MaxWith the transmitted power P corresponding with current location
tPoor Δ (S71).Later processing is identical with embodiment 1.Present embodiment 6 can both be implemented in any one of embodiment 2 to 4.
Claims (8)
1. the wireless communications method in the wireless communication system in this wireless communication system, carries out radio communication between terminal installation and the base station apparatus, and described wireless communications method is characterised in that to have following steps:
Described base station apparatus adopts MIMO to select the 1st send mode when signal sends to sending at described terminal installation, is not adopting MIMO to select the 2nd send mode when signal sends to sending,
Described terminal installation sends to described base station apparatus by selected described the 1st send mode or described the 2nd send mode with described transmission signal.
2. wireless communications method according to claim 1 is characterized in that the PAPR of described the 1st send mode is greater than the PAPR of described the 2nd send mode.
3. carry out radio communication between terminal installation, itself and base station apparatus, this terminal installation is characterised in that to have:
Acceptance division, it receives send mode from described base station apparatus and selects information, described send mode selects information representation to adopt MIMO to carry out selecting when signal sends the 1st send mode at described terminal installation, is not adopting MIMO to carry out selecting when signal sends the 2nd send mode; And
Sending part, it selects information according to described send mode, sends described transmission signal by described the 1st send mode or described the 2nd send mode to described base station.
4. terminal installation according to claim 3 is characterized in that the PAPR of described the 1st send mode is greater than the PAPR of described the 2nd send mode.
5. carry out radio communication between base station apparatus, itself and terminal installation, this base station apparatus is characterised in that to have:
Selection portion, it adopts MIMO to select the 1st send mode when signal sends to sending at described terminal installation, is not adopting MIMO to select the 2nd send mode when signal sends to sending; And
Sending part, its send mode selection information that will represent selected described the 1st send mode or described the 2nd send mode sends to described terminal installation,
Described terminal installation sends described transmission signal by selected described the 1st send mode or described the 2nd send mode.
6. base station apparatus according to claim 5 is characterized in that the PAPR of described the 1st send mode is greater than the PAPR of described the 2nd send mode.
7. a wireless communication system in this wireless communication system, carries out radio communication between terminal installation and the base station apparatus, and this wireless communication system is characterised in that,
Described base station apparatus has:
Selection portion, it adopts MIMO to select the 1st send mode when signal sends to sending at described terminal installation, is not adopting MIMO to select the 2nd send mode when signal sends to sending; And
Sending part, its send mode that sends selected described the 1st send mode of expression or described the 2nd send mode is selected information,
Described terminal installation has:
Acceptance division, it receives described send mode and selects information; And
Sending part, it selects information according to described send mode, sends described transmission signal by described the 1st send mode or described the 2nd send mode to described base station.
8. wireless communication system according to claim 7 is characterized in that the PAPR of described the 1st send mode is greater than the PAPR of described the 2nd send mode.
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| WO2018127022A1 (en) * | 2017-01-09 | 2018-07-12 | 中兴通讯股份有限公司 | Transmission power determination method, device, and system |
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