CN102056248A - Method and equipment for reducing peak-to-average ratio - Google Patents
Method and equipment for reducing peak-to-average ratio Download PDFInfo
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- CN102056248A CN102056248A CN2009102366986A CN200910236698A CN102056248A CN 102056248 A CN102056248 A CN 102056248A CN 2009102366986 A CN2009102366986 A CN 2009102366986A CN 200910236698 A CN200910236698 A CN 200910236698A CN 102056248 A CN102056248 A CN 102056248A
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Abstract
The embodiment of the invention discloses a method and equipment for reducing a peak-to-average ratio. The method comprises the following steps that: network side equipment allocates data subcarriers to a cell internal terminal and a cell edge terminal respectively; the network side equipment selects part or all of the data subcarriers from the data subcarriers of the cell internal terminal as the reserved subcarriers of the cell edge terminal; and the network side equipment superposes the reserved subcarriers and the data subcarriers of the cell edge terminal so as to reduce the peak-to-average ratio of the cell edge terminal. By the method and the equipment, the peak-to-average ratio of the cell edge terminal is reduced, the reserved subcarriers can transmit data, and the spectrum utilization efficiency of a system is improved.
Description
Technical field
The embodiment of the invention relates to communication technical field, relates in particular to a kind of method and apparatus that reduces peak-to-average force ratio.
Background technology
At OFDM (Orthogonal Frequency Division Multiplex, OFDM) in the system, ofdm signal is independently to be formed by stacking through the sub-carrier signal of ovennodulation by a plurality of, wherein, this ofdm signal that is formed by stacking may produce bigger peak power, thereby bring bigger PAPR (Peak-to-Average Power Ratio, peak-to-average power ratio), abbreviate peak-to-average force ratio as.In actual applications, when the peak-to-average force ratio of system is higher, increase the power consumption of terminal, caused the reduction of the front-end amplifier performance of terminal, and influenced the communication quality of system.
At present, the method of a variety of reduction peak-to-average force ratios has been proposed, for example, reduce peak-to-average force ratio by limit filtration, by SLM (Selected Mapping, the selectivity mapping) technology reduces peak-to-average force ratio, reduce peak-to-average force ratio by coding class technology, by TR (Tone Reservation, the subcarrier reservation) reduces peak-to-average force ratio, by TI (Tone Injection, the subcarrier injection) reduces peak-to-average force ratio, by ACE (Active Constellation Extension, effective constellation extension) reduces peak-to-average force ratio and reduce peak-to-average force ratio etc. by PTS (Partial Transmit Sequence, partial transmission sequence).
Concrete, in the method for above-mentioned reduction peak-to-average force ratio, it is a kind of based on the peak value that reduces original signal on the original signal that the data in time domain piece is added to that subcarrier is reserved TR, thereby reduces the method for terminal peak-to-average force ratio.Wherein, in TR, whole N subcarriers for system, some is used to carry the transfer of data between terminal and the base station, remainder will be as preserved sub-carrier, do not carry effective information in this preserved sub-carrier, can be positioned at the center and the two ends of frequency band, be used for spectrum shaping or rejection band and disturb.
In the prior art, the sub-carriers reservation can have following implementation for system: in ofdm system, by the method that the data-signal of frequency domain is carried out zero padding, realize that the subcarrier in the ofdm system is reserved, thereby provide protection frequency band and inhibition to disturb.As shown in Figure 1, for having the ofdm system schematic diagram of preserved sub-carrier, specific algorithm comprises: earlier to effective information string and conversion, and data are extended to the data that length is N in mode in the terminal zero padding of data, then the data after the expansion are carried out IFFT (Inverse Fast Fourier Transform, invert fast fourier transformation) computing is at last with data after the IFFT computing and string conversion.
From Fig. 1, have in the ofdm system structure of preserved sub-carrier as can be seen, in ofdm system with subcarrier reservation, therefore the carrier channel that is used for zero padding is not transmitted any effective information, can consider these carrier channels of not transmitting effective information are used to reduce the peak-to-average force ratio of system.As shown in Figure 2, by the preserved sub-carrier channel (promptly not transmitting the carrier channel of effective information) that is used for zero padding in the said system is improved, thereby reduce peak-to-average force ratio in the ofdm system.
From can drawing of Fig. 2, the specific algorithm that utilizes preserved sub-carrier to reduce the peak-to-average force ratio in the ofdm system is: earlier to effective information string and conversion, and in the additional control information (being non-zero) that is used to reduce peak-to-average force ratio of the end of data, thereby input is extended to the data that length is N, then the data after the expansion are carried out the IFFT computing, at last with data after the IFFT computing and string conversion.As can be seen, by using Peak-to-Average Power Ratio method shown in Figure 2, can effectively utilize the frequency spectrum resource of system.
Theory based on above-mentioned preserved sub-carrier, the basic thought that obtains the subcarrier preservation algorithm is: utilize a kind of frequency-region signal and original frequency-region signal with special construction to superpose, resulting time-domain signal can reduce the peak value of the pairing time-domain signal of the latter effectively after making the former through the IFFT computing, thereby reaches the purpose that reduces the system peak-to-average ratio.
In realizing process of the present invention, the inventor thinks and has following problem in the prior art at least:
Reserving TR by subcarrier reduces in the process of system peak-to-average ratio, though can be good at reducing the peak-to-average force ratio of system, but, adopting subcarrier to reserve needs the outer subcarrier of occupying volume when TR reduces peak-to-average force ratio, and transmitting data information not in the extra subcarrier, thereby caused the waste of resource, and caused the spectrum efficiency of system to reduce.
Summary of the invention
The embodiment of the invention provides a kind of method and apparatus that reduces peak-to-average force ratio, utilizes the preserved sub-carrier of the data subcarrier of sub-district inside terminals as the cell edge terminal, to reduce the peak-to-average force ratio of cell edge terminal, has improved the spectrum utilization efficiency of system.
In order to achieve the above object, the embodiment of the invention provides a kind of method that reduces peak-to-average force ratio, comprising:
Network equipment is sub-district inside terminals and cell edge terminal difference distribute data subcarrier;
Described network equipment selects part or total data subcarrier as the preserved sub-carrier of described cell edge terminal from the data subcarrier of described sub-district inside terminals;
Described network equipment superposes the data subcarrier of described preserved sub-carrier and described cell edge terminal, to reduce the peak-to-average force ratio of described cell edge terminal.
Preferably, described network equipment is sub-district inside terminals and cell edge terminal difference distribute data subcarrier, also comprises before:
Described network equipment obtains described location information of terminals, and determines that according to described positional information described terminal is the sub-district inside terminals, perhaps is the cell edge terminal.
Preferably, described network equipment obtains described location information of terminals, comprising:
Described network equipment receives the transmission power information from described terminal, and determines described location information of terminals according to described transmission power information; Perhaps,
Described network equipment receives from described location information of terminals, and described location information of terminals is that described terminal is determined according to the transmitting power of self.
Preferably, described network equipment superposes the data subcarrier of described preserved sub-carrier and described cell edge terminal, comprising:
Described network equipment is the signal that is used to reduce cell edge terminal data subcarrier peak value of described preserved sub-carrier transmission, superposes with the signal of the data subcarrier of described cell edge terminal transmission.
Preferably, described network equipment superposes the data subcarrier of described preserved sub-carrier and described cell edge terminal, also comprises afterwards:
Described network equipment determines according to described cell edge location information of terminals whether described cell edge terminal is moved;
When described cell edge terminal moved to inside, sub-district, described network equipment cancellation was the preserved sub-carrier of described cell edge terminal distribution.
The embodiment of the invention also provides a kind of network equipment, comprising:
Sub-carrier assignment module is used to sub-district inside terminals and cell edge terminal distribute data subcarrier respectively;
Preserved sub-carrier is selected module, is used for selecting part or the total data subcarrier preserved sub-carrier as described cell edge terminal from the data subcarrier of described sub-district inside terminals;
Peak-to-average force ratio reduces module, is used for the data subcarrier of described preserved sub-carrier and described cell edge terminal is superposeed, to reduce the peak-to-average force ratio of described cell edge terminal.
Preferably, also comprise:
Position information acquisition module is used to obtain described location information of terminals, and determines that according to described positional information described terminal is the sub-district inside terminals, is the cell edge terminal perhaps, specifically be used for,
Reception is from the transmission power information of described terminal, and determines described location information of terminals according to described transmission power information; Perhaps,
Reception is from described location information of terminals, and described location information of terminals is that described terminal is determined according to the transmitting power of self.
Preferably, described peak-to-average force ratio reduces module,
Specifically be used for the signal that is used to reduce cell edge terminal data subcarrier peak value, superpose with the signal of the data subcarrier of described cell edge terminal transmission with the transmission of described preserved sub-carrier.
Preferably, described position information acquisition module,
Also be used for determining according to described cell edge location information of terminals whether described cell edge terminal is moved; And when described cell edge terminal moves to inside, sub-district, cancel preserved sub-carrier for described cell edge terminal distribution.
The invention process a kind of terminal is provided, comprising:
The transmitting power detection module is used for the transmitting power of sense terminals;
The positional information judge module is used for according to detected transmitting power, determines that described terminal is the sub-district inside terminals, perhaps is the cell edge terminal,
The positional information sending module, be used for sending detected transmission power information to described network equipment, perhaps location information of terminals, and obtain described location information of terminals according to described transmission power information or location information of terminals by described network equipment, determining that according to described positional information described terminal is the sub-district inside terminals, perhaps is the cell edge terminal.
Compared with prior art, the embodiment of the invention has the following advantages: determine terminal residing position in the sub-district by the transmitting power of sense terminals, terminal is divided into sub-district inside terminals and cell edge terminal, network equipment is sub-district inside terminals and cell edge terminal distribution data subcarrier, and utilize the preserved sub-carrier of the data subcarrier of sub-district inside terminals as the cell edge terminal, in order to reduce the peak-to-average force ratio of cell edge terminal, under the prerequisite that does not influence sub-district inside terminals communication, reduced the peak-to-average force ratio of cell edge terminal, make preserved sub-carrier can transmit data, improved the spectrum utilization efficiency of system.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the ofdm system schematic diagram with preserved sub-carrier;
Fig. 2 utilizes preserved sub-carrier to reduce the schematic diagram of ofdm system peak-to-average force ratio;
A kind of schematic flow sheet that reduces the method for peak-to-average force ratio that Fig. 3 provides for the embodiment of the invention;
Fig. 4 is the schematic diagram that concerns of signal strength signal intensity and distance;
Fig. 5 reserves for subcarrier and reduces the peak-to-average force ratio power consumption diagram;
Fig. 6 is a kind of schematic flow sheet that reduces the method for peak-to-average force ratio under the concrete application scenarios of the present invention;
Fig. 7 is a kind of schematic flow sheet that reduces the method for peak-to-average force ratio under the Another Application scene of the present invention;
A kind of network equipment structural representation that Fig. 8 provides for the embodiment of the invention;
A kind of terminal structure schematic diagram that Fig. 9 provides for the embodiment of the invention.
Embodiment
In the embodiment of the invention, terminal is by detecting the transmitting power of self, and definite terminal residing position in the sub-district, terminal is divided into sub-district inside terminals and cell edge terminal, network equipment is the data subcarrier that sub-district inside terminals and cell edge terminal distribution are used to transmit data, and utilize the preserved sub-carrier of the data subcarrier of sub-district inside terminals as the cell edge terminal, in order to reduce the peak-to-average force ratio of cell edge terminal, make preserved sub-carrier can transmit data, improved the spectrum utilization efficiency of system.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of embodiment of the invention protection.
As shown in Figure 3, a kind of schematic flow sheet that reduces the method for peak-to-average force ratio for the embodiment of the invention provides specifically comprises the steps:
In embodiments of the present invention, network equipment need judge whether to the terminal distribution preserved sub-carrier according to terminal residing positional information in the sub-district, to reduce the peak-to-average force ratio that terminal may occur.Wherein, before carrying out the operation that network equipment is sub-district inside terminals and cell edge terminal difference distribute data subcarrier, need determine the positional information of terminal in the sub-district, and terminal is divided into sub-district inside terminals and cell edge terminal according to the positional information of terminal in the sub-district.
Concrete, the mode that the positional information of terminal in the sub-district determined comprises: terminal detects the transmitting power of self, and according to the relation between detected transmitting power and the default transmitting power threshold value, determines that terminal is the sub-district inside terminals, perhaps, be the cell edge terminal.Wherein, the setting of this transmitting power threshold value is to decide according to the applied environment of reality; When the transmitting power of terminal is more than default transmitting power threshold value, determine that this terminal is the cell edge terminal; When the transmitting power of terminal is not more than default transmitting power threshold value, determine that this terminal is the sub-district inside terminals.
Further, when terminal has been determined self to be sub-district inside terminals or cell edge terminal, the positional information of self directly can be reported network equipment, thereby make network equipment determine the positional information of terminal in the sub-district.Certainly, in actual applications, terminal can also directly report network equipment with detected transmission power information, then determine the positional information of this terminal in the sub-district by network equipment according to the transmitting power of this terminal, this network equipment is determined the processing procedure of the positional information of this terminal in the sub-district according to the transmitting power of this terminal, the processing procedure of determining the positional information in self sub-district with above-mentioned terminal is identical, gives unnecessary details no longer in detail in the embodiment of the invention.
Need to prove, in the real network system, terminal is to be distributed in zones of different in the sub-district, terminal is also different different along with distributed areas of residing position in the sub-district, terminal is residing position difference in the sub-district, and it is also different to cause terminal to receive the data signal strength that network equipment sends.A kind of signal strength signal intensity as shown in Figure 4 and distance concern schematic diagram, as can be seen from Figure 4, when the close together between terminal and the network equipment, the signal strength signal intensity that terminal receives is stronger, along with the increase of distance between terminal and the network equipment, the signal strength signal intensity that terminal receives more and more a little less than.Therefore, when terminal is far away apart from network equipment,, need to increase the transmitting power of terminal, to obtain stronger signal strength signal intensity in order to realize communicating by letter between terminal and the network equipment; And the terminal nearer apart from the subzone network side apparatus only needs lower transmitting power to realize communicating by letter with network equipment, and obtains signal to noise ratio preferably.
In summary it can be seen that the transmitting power of terminal is big more, terminal is far away more apart from the distance of subzone network side apparatus, otherwise the transmitting power of terminal is more little, and terminal is near more apart from the distance of subzone network side apparatus; Therefore, can use the transmission power level of terminal to determine terminal residing position in the sub-district.
In this step, when network equipment receives the positional information of terminal in the sub-district, after determining that terminal is sub-district inside terminals or cell edge terminal, need be sub-district inside terminals and cell edge terminal difference distribute data subcarrier, and use this data subcarrier to be corresponding district inside terminals, perhaps cell edge terminal transmission data.
Because the transmitting power of sub-district inside terminals is less, and when carrying out transfer of data between the network equipment, the probability that peak-to-average force ratio occurs is very low, promptly can be that sub-district inside terminals preserved sub-carrier is with the reduction peak-to-average force ratio; And the transmitting power of cell edge terminal is bigger, and when carrying out transfer of data between the network equipment, the probability that peak-to-average force ratio occurs is very high, and promptly needing is that cell edge terminal preserved sub-carrier is to reduce the peak-to-average force ratio of cell edge terminal.
Concrete, data subcarrier is used for the data-signal between transmission network side apparatus and the terminal, and preserved sub-carrier is used to transmit the signal of reduction data subcarrier peak value to reduce the peak-to-average force ratio of terminal.
As shown in Figure 5, for subcarrier is reserved reduction peak-to-average force ratio power consumption diagram, as can be seen from Figure 5, with respect to data signals transmitted power on the data subcarrier, the signal power of transmitting on preserved sub-carrier in order to reduce the data subcarrier peak value is low-down.For example, when the quantity of the preserved sub-carrier that is used to reduce the terminal peak-to-average force ratio is 50, the quantity that is used for the data subcarrier of transfer of data is 500, the ratio of preserved sub-carrier and data subcarrier is 0.1 o'clock, and it is 10 that being used to of transmitting on the preserved sub-carrier reduced the probability that data signals transmitted power takes place to disturb on the signal power of data subcarrier crest value and the data subcarrier
-4To 10
-5Between, so low probability is ignored in the practical communication process.
Very low based on the signal power of transmitting on the preserved sub-carrier in order to reduce the data subcarrier peak value, in embodiments of the present invention, the data subcarrier that utilizes the sub-district inside terminals as the preserved sub-carrier of cell edge terminal to reduce the peak-to-average force ratio of edge termination, data subcarrier has improved the spectrum efficiency of system at the peak-to-average force ratio of realizing having reduced in the transfer of data between sub-district inside terminals and the network equipment cell edge terminal.
Therefore, network equipment can for sub-district inside terminals and cell edge terminal respectively the distribute data subcarrier be used for transfer of data, and from the data subcarrier of sub-district inside terminals, select part or total data subcarrier preserved sub-carrier as the cell edge terminal, in order to reduce the peak-to-average force ratio of cell edge terminal.In the practical application scene, network equipment need be according to the required preserved sub-carrier quantity that reduces the cell edge terminal, from the data subcarrier of one or more sub-districts inside terminals, select part or total data subcarrier as the preserved sub-carrier of cell edge terminal, repeat no more in the embodiment of the invention.
Utilize the preserved sub-carrier of the part or all of data subcarrier of sub-district inside terminals as the cell edge terminal, transmission is used to reduce the signal of data subcarrier peak value on this preserved sub-carrier, in this step, with the signal that is used to reduce the data subcarrier peak value that transmits on the preserved sub-carrier, superpose with the data subcarrier data signals transmitted of cell edge terminal, the result of stack makes the peak-to-average force ratio of cell edge terminal reduce.
In the embodiment of the invention, determine terminal residing position in the sub-district by the transmitting power of sense terminals, terminal is divided into sub-district inside terminals and cell edge terminal, network equipment is sub-district inside terminals and cell edge terminal distribution data subcarrier, and utilize the preserved sub-carrier of the data subcarrier of sub-district inside terminals as the cell edge terminal, in order to reduce the peak-to-average force ratio of cell edge terminal, under the prerequisite that does not influence sub-district inside terminals communication, reduced the peak-to-average force ratio of cell edge terminal, make preserved sub-carrier can transmit data, improved the spectrum utilization efficiency of system.
Concrete application scenarios below in conjunction with the embodiment of the invention is described in detail technical scheme of the present invention, as shown in Figure 6, for a kind of method flow diagram that reduces peak-to-average force ratio under the concrete application scenarios of the present invention, comprises the steps:
In the network system of reality (for example, ofdm system) in, terminal will be distributed in the zones of different in the sub-district, the terminal of zones of different is in order to realize that (this network equipment comprises base station and eNB etc. with network equipment in the sub-district, should use in the scene, with the base station is that example describes) between communication, transmitting power also has nothing in common with each other, when terminal is very near apart from the base station, the transmitting power of terminal in very low scope, just can realize with the base station between communicate by letter, and obtain good signal to noise ratio, and the too high problem of peak-to-average force ratio can not take place; When terminal is far away more apart from the base station, need to strengthen the transmitting power of terminal, and and the base station between communicate, the increase of transmitting power, the probability that makes the terminal far away apart from the base station peak-to-average force ratio occur increases.
Based on the position difference of terminal in the sub-district, the corresponding different characteristics of transmitting power, can utilize the transmitting power of terminal to determine terminal residing position in the sub-district, the base station can judge whether to the terminal preserved sub-carrier according to terminal residing positional information in the sub-district, and reduce the peak-to-average force ratio problem that terminal may occur.
Need to prove that when the terminal occurrence positions in the sub-district changed, the distance between terminal and the base station changed immediately, corresponding, the transmitting power of terminal may become big or diminish.Therefore, can be periodically to detect, regularly detect or the transmitting power of sense terminals when between sub-district and base station, carrying out transfer of data to the detection of terminal transmit power, the variation of concrete detection mode does not influence protection scope of the present invention.
Determine terminal residing position in the sub-district according to the transmitting power of terminal, be whether to be higher than default transmitting power threshold value by the transmitting power of judging detected terminal to carry out, when judged result when being, determine that this terminal is the cell edge terminal, when judged result for not the time, determine that this terminal is the sub-district inside terminals.
Further, relation between transmitting power by terminal and the default transmitting power threshold value is divided into sub-district inside terminals and cell edge terminal with terminal, this transmitting power threshold value is the lowest transmit power that the peak-to-average force ratio problem of too appears in terminal, when the transmitting power of terminal is higher than this transmitting power threshold value, this terminal is defined as the cell edge terminal, the probability that peak-to-average force ratio occurs is very high, need for cell edge terminal distribution preserved sub-carrier to reduce peak-to-average force ratio.Need to prove, this transmitting power threshold value can require to set according to the difference under the actual application environment, for example, it is lower to set the transmitting power threshold value, increase the scope of application of cell edge terminal, occur the probability of peak-to-average force ratio problem of too for more cell edge terminal distribution preserved sub-carrier with the minimizing terminal.
Should be with under the scene, with two terminals in the sub-district is that example describes, and wherein the transmitting power of terminal A is higher than default transmitting power threshold value, and terminal A is the cell edge terminal, the transmitting power of terminal B is lower than default transmitting power threshold value, and terminal B is the sub-district inside terminals.
Terminal reports the base station with the positional information of self, it is sub-district inside terminals or cell edge terminal information that this positional information comprises terminal, after the base station receives location information of terminals, be sub-district inside terminals and cell edge terminal distribution data subcarrier, data subcarrier is used for the transfer of data between terminal and the base station.
The base station is sub-district inside terminals and cell edge terminal distribution data subcarrier, data subcarrier is used for the transfer of data between terminal and the base station, wherein, the transmitting power of sub-district inside terminals is lower, when carrying out transfer of data with the base station, the probability that the peak-to-average force ratio problem of too occurs is very low, need not to distribute preserved sub-carrier into the sub-district inside terminals; The transmitting power of cell edge terminal is higher than default transmitting power threshold value, and when carrying out transfer of data with the base station, it is very high the higher probability of peak-to-average force ratio to occur, need be the peak-to-average force ratio of cell edge terminal distribution preserved sub-carrier in order to reduction cell edge terminal.In order to reduce the peak-to-average force ratio of cell edge terminal, in the embodiment of the invention data subcarrier that utilizes the sub-district inside terminals as the preserved sub-carrier of cell edge terminal, utilize the signal that is used to reduce cell edge terminal data subcarrier peak value that transmits on this preserved sub-carrier, superpose with the data subcarrier data signals transmitted of cell edge terminal, the result of stack makes the peak-to-average force ratio of cell edge terminal reduce.
Should be with under the scene, terminal B is the sub-district inside terminals, and when carrying out transfer of data with the base station, its transmitting power is lower, and it is very low the higher probability of peak-to-average force ratio to occur, need not to distribute preserved sub-carrier into terminal B; Terminal A is the cell edge terminal, the base station is a terminal A distribute data subcarrier, terminal A needs to carry out the transmission of data between bigger transmitting power and the base station, and it is higher that the higher probability of peak-to-average force ratio takes place terminal A, and the base station need distribute preserved sub-carrier in order to reduce the peak-to-average force ratio of terminal A for terminal A.
The base station utilizes the preserved sub-carrier of the data subcarrier of terminal B as terminal A, the data subcarrier of terminal B is realized the transfer of data between terminal B and base station, and transmission is used to reduce the signal of terminal A data subcarrier peak value, the data subcarrier data signals transmitted of this signal and terminal A superposes, and reduces the peak-to-average force ratio of terminal A.
For example, base station assigns is given terminal A and each 100 data subcarrier of terminal B, the base station can utilize wherein 10 data subcarriers of distributing to terminal B preserved sub-carrier as terminal A, and as 10 data subcarriers of the terminal B of the preserved sub-carrier of terminal A, can between terminal B and base station, carry out transfer of data, and as the preserved sub-carrier of terminal A transmission is used to reduce the signal of terminal A data subcarrier peak value, superpose with the data subcarrier data signals transmitted of terminal A, reduce the peak-to-average force ratio of terminal A.
Need to prove, the required preserved sub-carrier of peak-to-average force ratio that is used to reduce terminal A can be the part or all of data subcarrier of a sub-district inside terminals, also can be the part or all of data subcarrier of a plurality of sub-districts inside terminals, concrete, select according to the quantity of the required preserved sub-carrier of peak-to-average force ratio that reduces terminal A and concrete applied environment.
Data subcarrier by utilizing the sub-district inside terminals is as the preserved sub-carrier of cell edge terminal, to reduce the peak-to-average force ratio of cell edge terminal, under the prerequisite that does not influence sub-district inside terminals communication, reduced the peak-to-average force ratio of cell edge terminal, make preserved sub-carrier can transmit data, need not to be the extra preserved sub-carrier of cell edge terminal distribution, improved the spectrum utilization efficiency of system.
In addition, need to prove that in above-mentioned application scenarios, the base station receives from location information of terminals, this positional information is that terminal is determined according to the transmitting power of self, promptly determines that according to the transmitting power of terminal self terminal is sub-district inside terminals and cell edge terminal.In application scenarios of the present invention, terminal is when detecting the transmitting power of self, the residing positional information of terminal is not judged, directly the transmitting power message of self is issued the base station, the base station receives the transmitting power message of terminal the residing positional information of terminal is judged, judge that terminal is sub-district inside terminals or cell edge terminal, and be terminal difference distribute data subcarrier.Concrete, the transmitting power message that sends according to terminal determines that terminal residing position in the sub-district is the relation between transmitting power and the transmitting power threshold value of presetting by comparison terminal, and this process is given unnecessary details no longer in detail.
In the real network environment, terminal occurrence positions in cell range substitutes, be the position of terminal in the sub-district when changing, in order to realize the transfer of data between terminal and the base station, the transmitting power of terminal will be along with corresponding the change taken place from the evolution in the sub-district.For example, the sub-district inside terminals is when occurrence positions substitutes, and the distance between terminal and the base station may increase, to such an extent as to need increasing transmitting power and base station to carry out transfer of data, thereby cause the sub-district inside terminals to become the cell edge terminal, need preserved sub-carrier then; Same, the cell edge terminal may be transformed to the sub-district inside terminals when occurrence positions substitutes, and promptly not needing the base station is that it distributes preserved sub-carrier.Therefore, when the terminal occurrence positions substituted, the corresponding change took place in the transmitting power of terminal, and terminal the higher probability of peak-to-average force ratio occurs corresponding variation also takes place; Promptly when the terminal occurrence positions substituted, the sub-district inside terminals that the base station may need to substitute for occurrence positions distributed preserved sub-carrier to reduce peak-to-average force ratio, maybe may cancel the cell edge that substitutes for occurrence positions and distribute preserved sub-carrier.
As shown in Figure 7, be a kind of schematic flow sheet that reduces the method for peak-to-average force ratio under the Another Application scene of the present invention, should be with under the scene, be that to distribute the process of preserved sub-carrier with starting terminal be that example describes.Wherein, when receiving the startup of terminal transmission in the base station or cancelling the TR request message, the startup TR request message that sends according to terminal is the terminal distribution preserved sub-carrier, and the cancellation TR request message cancellation that sends according to terminal is the terminal distribution preserved sub-carrier, specifically comprises the steps:
Whether step 301, terminal judges have started the peak-to-average force ratio that TR is used to reduce terminal, and detect the transmitting power of self.When judged result for not the time, execution in step 302; When judged result when being, execution in step 306.Wherein, when terminal received preserved sub-carrier, then explanation had started the peak-to-average force ratio that TR is used to reduce terminal, otherwise, be not activated the peak-to-average force ratio that TR is used to reduce terminal.
Need to prove, when terminal is not activated TR and is used to reduce the peak-to-average force ratio of terminal, illustrate that then this terminal is the sub-district inside terminals in the previous sense cycle, in this step, when knowing that transmitting power is higher than transmitting power threshold value M1, illustrate that then this terminal occurrence positions substitutes, and has become the cell edge terminal.
Concrete, when the current transmit power of judging this terminal was higher than transmitting power threshold value M1, peak-to-average force ratio problem of too, execution in step 303 may appear causing in this terminal; When its current transmitting power of terminal judges is not higher than default transmitting power M1, the transmitting power of terminal can realize communicating by letter preferably in lower scope with the base station, it is very low that the higher probability of peak-to-average force ratio appears in terminal, do not need to start the peak-to-average force ratio that TR is used to reduce terminal.
Above-mentioned transmitting power threshold value M1 is used to reduce the transmitting power threshold value of terminal peak-to-average force ratio for starting terminal TR, or the terminal transmit power of peak-to-average force ratio when higher may take place default terminal, can set according to concrete applied environment.
The current transmit power of step 303, statistics terminal is higher than the number of times of transmitting power threshold value M1, and judges whether this number of times surpasses and start the frequency threshold value T1 that TR is used to reduce the peak-to-average force ratio of terminal, when judged result when being, execution in step 304; When judged result for not the time, process ends.
When the current transmitting power of terminal judges is higher than transmitting power threshold value M1, the current transmit power of statistics terminal is higher than the number of times of transmitting power threshold value M1, add 1 time on former number of times basis, the current transmit power that obtains terminal is higher than the total degree t1 of transmitting power threshold value M1.Terminal judges according to default frequency threshold value T1 whether t1 is higher than this frequency threshold value T1, and this frequency threshold value T1 is used to reduce the frequency threshold value of the peak-to-average force ratio of terminal for starting terminal TR, or according to the frequency threshold value of real network environment set.When judging t1 greater than T1, total degree that the transmitting power that shows terminal surpasses transmitting power threshold value M1 has reached the frequency threshold value that starting terminal TR is used to reduce the peak-to-average force ratio of terminal, and terminal reports request to start the request message that TR is used to reduce the peak-to-average force ratio of terminal to the base station; When judged result for not the time, number of times that the transmitting power that shows terminal surpasses transmitting power threshold value M1 has not reached the frequency threshold value T1 that starting terminal TR is used to reduce the peak-to-average force ratio of terminal, process ends.
Need to prove, the number of times that is higher than transmitting power threshold value M1 by the transmitting power that terminal is set, in the position of network environment instability or terminal temporary variation takes place and cause and guaranteed the accurate judgement to positional information in the sub-district, terminal place under the situation of transmitting power fluctuation of terminal; Certainly, in actual applications, the number of times that this transmitting power is higher than transmitting power threshold value M1 can be set yet, promptly not carry out this step, directly execution in step 304 does not repeat them here.
When terminal judges need start TR and is used to reduce the terminal peak-to-average force ratio, report to the base station to start the request message that TR is used to reduce the terminal peak-to-average force ratio, and wait for the response of base station this request message.
After the startup TR that the base station obtains terminal to report is used to reduce the request message of terminal peak-to-average force ratio, select the preserved sub-carrier of the data subcarrier of sub-district inside terminals as this terminal, to reduce the higher problem of this terminal peak-to-average force ratio, and to the response message of terminal transmission to this request message, this process is given unnecessary details no longer in detail.
Need to prove, when the base station receives the startup TR request message of terminal transmission, according to the sub-district inside terminals is the actual conditions of cell edge terminal preserved sub-carrier, and terminal is to the startup TR request message or the cancellation TR request message of base station transmission, generate cell resource scheduling information according to predetermined strategy, be the terminal distribution preserved sub-carrier, realized that the optimization of cell range intercarrier rationally utilizes.
The part or all of data subcarrier of step 305, base station selected sub-district inside terminals starts TR and is used to reduce the terminal peak-to-average force ratio as the preserved sub-carrier of this terminal.Wherein, when being used to reduce peak-to-average force ratio for the terminal distribution preserved sub-carrier, the transmitting power of terminal is higher than the statistics number value zero clearing of transmitting power threshold value M1 in the base station.
Need to prove, the data subcarrier of the terminal of inside, base station selected sub-district is as the preserved sub-carrier of cell edge terminal, can select and the near terminal of cell edge terminal distance, the perhaps good terminal of sub-district inside terminals channel quality, and can select the preserved sub-carrier of the part or all of data subcarrier of a sub-district inside terminals as the cell edge terminal, can also select the preserved sub-carrier of the part or all of data subcarrier of a plurality of sub-districts inside terminals, specifically adopt in which kind of mode embodiment of the invention to repeat no more as the cell edge terminal.
Need to prove, when terminal has started TR and is used to reduce the peak-to-average force ratio of terminal, illustrate that then this terminal is the cell edge terminal in the previous sense cycle, in this step, when knowing that transmitting power is lower than transmitting power threshold value M2, illustrate that then this terminal occurrence positions substitutes, and has become the sub-district inside terminals.
Concrete, when the current transmit power of judging this terminal is lower than transmitting power threshold value M2, distance between this terminal and the base station shortens, need not too high transmitting power, just can carry out transfer of data with the base station under less transmitting power, and obtain signal to noise ratio preferably, the cell edge terminal is after occurrence positions substitutes, it is very little that higher probability of peak-to-average force ratio takes place for it, needs execution in step 307.
The current transmit power of step 307, statistics terminal is lower than the number of times of transmitting power threshold value M2, and judges that whether this number of times surpasses the frequency threshold value T2 of cancellation TR, when judged result when being, execution in step 308; When judged result for not the time, process ends.
When the current transmitting power of terminal judges was lower than transmitting power threshold value M2, the statistics current transmit power was lower than the number of times of transmitting power threshold value M2, adds 1 time on former number of times basis, and the current transmit power that obtains terminal is lower than the total degree t2 of transmitting power threshold value M2.This frequency threshold value T2 is the frequency threshold value that terminal cancellation TR is used to reduce the peak-to-average force ratio of terminal, or according to the frequency threshold value of real network environment set.When judging that t2 is greater than T2, the total degree that the transmitting power that shows terminal is lower than transmitting power threshold value M2 has reached the frequency threshold value of cancellation TR, and terminal reports the request message of request cancellation TR to the base station; When judged result for not the time, the number of times that the transmitting power that shows terminal is lower than transmitting power threshold value M2 has not reached terminal cancellation TR frequency threshold value T2, process ends.
Need to prove that in embodiments of the present invention, above-mentioned transmitting power threshold value M1 and transmitting power threshold value M2 can be identical, also can be different.Corresponding, above-mentioned frequency threshold value T1 and frequency threshold value T2 can be identical, also can be different.
When terminal judges need be cancelled TR, report the request message of cancellation TR to the base station, and wait for the response of base station this request message.When the base station obtains the request message of the cancellation TR of terminal to report, to the terminal feedback response message.
Concrete, the base station need not to this terminal distribution preserved sub-carrier in order to reduce the peak-to-average force ratio of terminal, simultaneously, according to the demand of terminal in the cell range, the preserved sub-carrier of distributing to this terminal is started the required preserved sub-carrier that TR is used to reduce the terminal of terminal peak-to-average force ratio as needs to preserved sub-carrier.When terminal cancellation TR, starting terminal is reduced the statistics number value zero clearing that transmitting power before the scheme is lower than transmitting power threshold value M2.
In the embodiment of the invention, determine terminal residing position in the sub-district by the transmitting power that detects self, terminal is divided into sub-district inside terminals and cell edge terminal, the base station is sub-district inside terminals and cell edge terminal distribution data subcarrier, and utilize the preserved sub-carrier of the data subcarrier of sub-district inside terminals as the cell edge terminal, in order to reduce the peak-to-average force ratio of cell edge terminal, under the prerequisite that does not influence sub-district inside terminals communication, reduced the peak-to-average force ratio of cell edge terminal, make preserved sub-carrier can transmit data, improved the spectrum utilization efficiency of system.
As shown in Figure 8, a kind of network equipment structural representation for the embodiment of the invention provides comprises:
Position information acquisition module 410 is used to obtain described location information of terminals, and determines that according to described positional information described terminal is the sub-district inside terminals, perhaps is the cell edge terminal, and is concrete,
Reception is from the transmission power information of described terminal, and determines described location information of terminals according to described transmission power information; Perhaps,
Reception is from described location information of terminals, and described location information of terminals is that described terminal is determined according to the transmitting power of self.
Preserved sub-carrier is selected module 430, is connected with sub-carrier assignment module 420, be used for from the data subcarrier of described sub-district inside terminals select partly or the total data subcarrier as the preserved sub-carrier of described cell edge terminal;
Peak-to-average force ratio reduces module 440, selects module 430 to be connected with sub-carrier assignment module 420 and preserved sub-carrier, is used for the data subcarrier of described preserved sub-carrier and described cell edge terminal is superposeed, to reduce the peak-to-average force ratio of described cell edge terminal.
Wherein, preserved sub-carrier is selected module 430,
Specifically being used to utilize the data subcarrier of sub-district inside terminals is described sub-district inside terminals transmission data, utilizes the preserved sub-carrier of the part or all of data subcarrier of sub-district inside terminals as the cell edge terminal simultaneously.
Wherein, peak-to-average force ratio reduces module 440,
Specifically be used for the signal of the signal that is used to reduce cell edge terminal data subcarrier peak value of described preserved sub-carrier transmission and the data subcarrier of cell edge terminal transmission is superposeed the peak value of the data subcarrier of reduction cell edge terminal transmission.
In addition, described position information acquisition module 410,
Also be used for determining according to described cell edge location information of terminals whether described cell edge terminal is moved; And when described cell edge terminal moves to inside, sub-district, cancel preserved sub-carrier for described cell edge terminal distribution.
As shown in Figure 9, a kind of terminal structure schematic diagram for the embodiment of the invention provides comprises:
Transmitting power detection module 510 is used for the transmitting power of sense terminals;
Positional information judge module 520 is connected with transmitting power detection module 510, is used for according to detected transmitting power, determines that described terminal is the sub-district inside terminals, perhaps is the cell edge terminal,
Positional information sending module 530, be connected with positional information judge module 520, be used for detecting transmission power information to described network equipment transmission, or location information of terminals, and obtain described location information of terminals according to described transmission power information or location information of terminals by described network equipment, determining that according to described positional information described terminal is the sub-district inside terminals, perhaps is the cell edge terminal.
In the equipment that the embodiment of the invention provides, determine terminal residing position in the sub-district by the transmitting power that detects self, terminal is divided into sub-district inside terminals and cell edge terminal, the base station is sub-district inside terminals and cell edge terminal distribution data subcarrier, and utilize the preserved sub-carrier of the data subcarrier of sub-district inside terminals as the cell edge terminal, in order to reduce the peak-to-average force ratio of cell edge terminal, under the prerequisite that does not influence sub-district inside terminals communication, reduced the peak-to-average force ratio of cell edge terminal, make preserved sub-carrier can transmit data, improved the spectrum utilization efficiency of system.
Through the above description of the embodiments, those skilled in the art can be well understood to the embodiment of the invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, the technical scheme of the embodiment of the invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module in the accompanying drawing or flow process might not be that the enforcement embodiment of the invention is necessary.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
More than disclosed only be several specific embodiment of the present invention, still, the embodiment of the invention is not limited thereto, any those skilled in the art can think variation all should fall into the protection range of the embodiment of the invention.
Claims (10)
1. a method that reduces peak-to-average force ratio is characterized in that, comprising:
Network equipment is sub-district inside terminals and cell edge terminal difference distribute data subcarrier;
Described network equipment selects part or total data subcarrier as the preserved sub-carrier of described cell edge terminal from the data subcarrier of described sub-district inside terminals;
Described network equipment superposes the data subcarrier of described preserved sub-carrier and described cell edge terminal, to reduce the peak-to-average force ratio of described cell edge terminal.
2. the method for claim 1 is characterized in that, described network equipment is sub-district inside terminals and cell edge terminal difference distribute data subcarrier, also comprises before:
Described network equipment obtains described location information of terminals, and determines that according to described positional information described terminal is the sub-district inside terminals, perhaps is the cell edge terminal.
3. method as claimed in claim 2 is characterized in that, described network equipment obtains described location information of terminals, comprising:
Described network equipment receives the transmission power information from described terminal, and determines described location information of terminals according to described transmission power information; Perhaps,
Described network equipment receives from described location information of terminals, and described location information of terminals is that described terminal is determined according to the transmitting power of self.
4. as each described method of claim 1-3, it is characterized in that described network equipment superposes the data subcarrier of described preserved sub-carrier and described cell edge terminal, comprising:
Described network equipment is the signal that is used to reduce cell edge terminal data subcarrier peak value of described preserved sub-carrier transmission, superposes with the signal of the data subcarrier of described cell edge terminal transmission.
5. method as claimed in claim 4 is characterized in that, described network equipment superposes the data subcarrier of described preserved sub-carrier and described cell edge terminal, also comprises afterwards:
Described network equipment determines according to described cell edge location information of terminals whether described cell edge terminal is moved;
When described cell edge terminal moved to inside, sub-district, described network equipment cancellation was the preserved sub-carrier of described cell edge terminal distribution.
6. a network equipment is characterized in that, comprising:
Sub-carrier assignment module is used to sub-district inside terminals and cell edge terminal distribute data subcarrier respectively;
Preserved sub-carrier is selected module, is used for selecting part or the total data subcarrier preserved sub-carrier as described cell edge terminal from the data subcarrier of described sub-district inside terminals;
Peak-to-average force ratio reduces module, is used for the data subcarrier of described preserved sub-carrier and described cell edge terminal is superposeed, to reduce the peak-to-average force ratio of described cell edge terminal.
7. network equipment as claimed in claim 6 is characterized in that, also comprises:
Position information acquisition module is used to obtain described location information of terminals, and determines that according to described positional information described terminal is the sub-district inside terminals, is the cell edge terminal perhaps, specifically be used for,
Reception is from the transmission power information of described terminal, and determines described location information of terminals according to described transmission power information; Perhaps,
Reception is from described location information of terminals, and described location information of terminals is that described terminal is determined according to the transmitting power of self.
8. as claim 6 or 7 described network equipments, it is characterized in that described peak-to-average force ratio reduces module,
Specifically be used for the signal that is used to reduce cell edge terminal data subcarrier peak value, superpose with the signal of the data subcarrier of described cell edge terminal transmission with the transmission of described preserved sub-carrier.
9. network equipment as claimed in claim 8 is characterized in that, described position information acquisition module,
Also be used for determining according to described cell edge location information of terminals whether described cell edge terminal is moved; And when described cell edge terminal moves to inside, sub-district, cancel preserved sub-carrier for described cell edge terminal distribution.
10. a terminal is characterized in that, comprising:
The transmitting power detection module is used for the transmitting power of sense terminals;
The positional information judge module is used for according to detected transmitting power, determines that described terminal is the sub-district inside terminals, perhaps is the cell edge terminal,
The positional information sending module, be used for sending detected transmission power information to described network equipment, perhaps location information of terminals, and obtain described location information of terminals according to described transmission power information or location information of terminals by described network equipment, determining that according to described positional information described terminal is the sub-district inside terminals, perhaps is the cell edge terminal.
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| WO2024082926A1 (en) * | 2022-09-28 | 2024-04-25 | 华为技术有限公司 | Signal transmission method, communication system and communication apparatus |
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