CN102378343A - Power allocation method and device in orthogonal frequency division multiplexing access system - Google Patents
Power allocation method and device in orthogonal frequency division multiplexing access system Download PDFInfo
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- CN102378343A CN102378343A CN2010102505394A CN201010250539A CN102378343A CN 102378343 A CN102378343 A CN 102378343A CN 2010102505394 A CN2010102505394 A CN 2010102505394A CN 201010250539 A CN201010250539 A CN 201010250539A CN 102378343 A CN102378343 A CN 102378343A
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Abstract
The invention discloses a power allocation method and a device in an orthogonal frequency division multiplexing access system. The method comprises the steps of conducting preliminary power allocation to all users and conducting power adjustment to users with an actual signal-to-noise ratio exceeding a signal-to-noise ratio upper limit corresponding to a supportable highest-order modulation coding method to obtain residual power; and for users with the actual signal-to-noise ratio not exceeding the signal-to-noise ratio upper limit corresponding to the supportable highest-order modulation coding method, preferentially allocating the residual power to a user who can bring about the largest throughput gain in a single resource unit. By allocating the residual power according to a rule that the largest throughput gain is brought about in each resource unit, the maximization of the throughput gain of the system is realized.
Description
Technical field
The invention belongs to wireless communication technology field, relate in particular to power distribution method and device in a kind of orthogonal frequency division multiple access system.
Background technology
OFDMA (Orthogonal Frequency Division Multiplexing Access; OFDM) be with OFDM (Orthogonal Frequency Division Multiplexing; OFDM) be modulated to basic new generation of wireless access technology, it will insert and modulate effectively and combine.
In the OFDMA system, the user receives the signal that sends from the base station and produces fluctuation because of path loss, shadow fading and small scale decline usually.In order to improve systematic function, adopt link adaptation techniques to compensate these fluctuations usually, one of wherein the most frequently used link adaptation techniques is exactly a power division.
The purpose of power division then is under the certain situation of gross power, according to the channel conditions of different user, reaches the throughput of system maximum through between different user, distributing different power.Existing a kind of power distribution method mainly comprises: first sub-distribution power and certain customers are carried out the power adjustment; Remaining power is distributed to the user who adopts the higher-order modulation coded system as far as possible, makes it further promote the one-level modulation coding mode.
Because for higher-order and two modulation coding modes of lower-order; Be not that the higher-order modulation coded system promotes the throughput gain of throughput gain with regard to necessarily being brought greater than lower order modulated coded system lifting one-level modulation coding mode that the one-level modulation coding mode is brought; Therefore adopt said method can not realize the maximization of throughput gain, and then make systematic function receive certain loss.
Summary of the invention
In view of above-mentioned analysis, the present invention aims to provide power distribution method and the device in a kind of orthogonal frequency division multiple access system, can not realize the maximized problem of throughput gain in order to solve existing power distribution method.
The object of the invention is mainly realized through following technical scheme:
The invention provides the power distribution method in a kind of orthogonal frequency division multiple access system, comprising:
Steps A: all users are carried out first power division, and the user that actual signal to noise ratio exceeds the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding is carried out the power adjustment, obtain dump power;
Step B:, preferentially said dump power is distributed to the user of the throughput gain maximum that can bring on the single resource units for the user that actual signal to noise ratio does not exceed the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding.
Further, said steps A specifically comprises:
All users are carried out first power division;
The user that actual signal to noise ratio is exceeded the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding drops to it with the power of distributing to this user for the first time and can support the required power of high order modulation coded system;
To pass through power that has more after the first power division and the power that will distribute to this user for the first time drops to it and can support to add the power that has more behind the required power of high order modulation coded system together as dump power.
Further, said step B specifically comprises:
Step B1: do not exceed among the user of the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding in actual signal to noise ratio, select to promote the one-level modulation coding mode and give the user that can bring the throughput gain maximum on the single resource units;
Step B2: the user who judges this selection promotes the required power of one-level decode-regulating mode and whether is not more than said dump power, if distribute its required power in said dump power, for this user, and upgrade said dump power; Otherwise will not distribute;
Step B3: judge whether all users that actual signal to noise ratio does not exceed the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding all were selected, if finish dump power and distribute, otherwise forward step B1 to.
Wherein, the throughput gain that can bring on the single resource units is meant, the user promotes the ratio of the number of throughput that one-level decode-regulating mode brought and this CU resource units.
The present invention also provides the power distribution unit in a kind of orthogonal frequency division multiple access system, comprising:
The dump power acquiring unit is used for all users are carried out first power division, and carries out the power adjustment for the user that actual signal to noise ratio exceeds the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding, obtains dump power;
The dump power allocation units are used for actual signal to noise ratio is not exceeded the user of the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding, preferentially said dump power are distributed to the user that can bring the throughput gain maximum on the single resource units.
Further, said dump power acquiring unit specifically comprises:
First power division module is used for all users are carried out first power division;
Fall power model, be used for actual signal to noise ratio is exceeded the user of the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding, the power of distributing to this user is for the first time dropped to it can support the required power of high order modulation coded system;
The dump power statistical module is used for power that has more after the said first power division resume module and the said power that has more after power model is handled that falls are added together as dump power.
Further, said dump power allocation units specifically comprise:
Select module, be used for not exceeding the user of the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding, select to promote the one-level modulation coding mode and give the user that can bring the throughput gain maximum on the single resource units in actual signal to noise ratio;
First judge module; Be used for this selected user of said selection module is judged; Judge that this user promotes the required power of one-level decode-regulating mode and whether is not more than said dump power; If distribute its required power in said dump power, for this user, and upgrade said dump power; Otherwise will not distribute;
Second judge module; Be used to judge whether all users that actual signal to noise ratio does not exceed the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding were all selected by said selection module; If finish dump power and distribute, otherwise trigger said selection module.
Beneficial effect of the present invention is following:
The present invention has realized the maximization of system throughput flow gain through coming the throughput gain maximal criterion that dump power is distributed according to each resource units upper erengy band.
Other features and advantages of the present invention will be set forth in specification subsequently, and from specification, becoming of part is obvious, perhaps understands through embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Description of drawings
Fig. 1 is in the embodiment of the invention, the schematic flow sheet of power distribution method in the LTE system;
Fig. 2 is in the embodiment of the invention, the schematic flow sheet that dump power is distributed;
Fig. 3 is the structural representation of the said device of the embodiment of the invention.
Embodiment
Specifically describe the preferred embodiments of the present invention below in conjunction with accompanying drawing, wherein, accompanying drawing constitutes the application's part, and is used to explain principle of the present invention with embodiments of the invention.For clear and simplification purpose, when it possibly make theme of the present invention smudgy, with specifying in detail of known function and structure in the omission device described herein.
At first, be elaborated in conjunction with accompanying drawing 1 and 2 pairs of said methods of the embodiment of the invention of accompanying drawing.
The embodiment of the invention can be applied to LTE (Long Term Evolution; Long Term Evolution) system and WiMAX (Worldwide Interoperability for Microwave Access; Worldwide interoperability for microwave inserts) OFDMA system such as system is that example describes with the LTE system only here.
As shown in Figure 1, Fig. 1 is the schematic flow sheet of power distribution method in the LTE system, and the flow process of this embodiment specifically can realize that it mainly may further comprise the steps through the base station:
Step 101: first power division is carried out to all users that needs carry out power division in the base station, and the power that has more after the first power division is called first dump power in embodiments of the present invention, and this first dump power also possibly be zero; As a specific embodiment of the present invention, when each user is carried out first power division, can adopt constant power distribution method or water-filling algorithm, specifically select which kind of method to carry out first power division and can decide according to actual conditions;
Step 102: the base station is through calculating or know each user's signal to noise ratio through reception, and each user's signal to noise ratio is sorted according to from big to small order; As a specific embodiment of the present invention, under LTE FDD (Frequency Division Duplex) pattern, the user can measure each user's signal to noise ratio according to downlink reference signal, and reports the base station; Under LTE TDD (Time Division Duplex) pattern, the base station can calculate each user's signal to noise ratio according to uplink reference signals or detectable signal;
Step 103: all users are divided into groups according to its actual signal to noise ratio signal to noise ratio upper limit corresponding with supporting high order modulation coded system; One group is the signal to noise ratio upper limit that actual signal to noise ratio surpasses the high order modulation coded system correspondence that can support; For the ease of explanation, set this group user in the present embodiment and organize 1 for the user; Another group is the signal to noise ratio upper limit that actual signal to noise ratio surpasses the high order modulation coded system correspondence support, and for the ease of explaining, this group of setting user organizes 2 for the user in the present embodiment;
Step 104: the user is organized 1 carry out power adjustment, be about to power that the user organizes each user in 1 and drop to and support its required power of high order modulation coded system, additional that part of power is called second dump power in embodiments of the present invention;
Step 105: total dump power that the second dump power addition that produces in first dump power that produces in the step 101 and the step 104 obtains; And according to bringing the throughput gain maximal criterion to carry out the dump power distribution on the single resource units; Be about to the dump power priority allocation and organize the user that can bring throughput to increase maximum in 2 on the single resource units to the user, the detailed process that dump power is distributed is referring to Fig. 2.
As shown in Figure 2, Fig. 2 is in the embodiment of the invention, and the schematic flow sheet that dump power is distributed specifically can may further comprise the steps:
Step 201: each user in the statistics of user's group 2 promotes throughput gain that the one-level modulation coding mode brought and required power; And the quantity of the resource units of this CU, and through calculate the throughput gain that each user can bring on single resource units;
Wherein, the throughput gain that can bring on the single resource units can obtain through following method:
Calculate the ratio that the user promotes the number of throughput gain that the one-level modulation coding mode brought and this CU resource units, the ratio that calculates is the throughput gain that this user can bring on single resource units;
The user that the user is organized in 2 travels through successively, and ergodic process such as step 202～step 206 is said:
Step 202: the user who selects to bring on the single resource units throughput gain maximum;
Step 203: judge that this user promotes the required power of one-level modulation coding mode and whether is not more than dump power, if forward step 204 to; Otherwise forward step 205 to;
Step 204: distribute it to promote the required power of one-level modulation coding mode in dump power, for this user, upgrade the numerical value of dump power, and forward step 206 to;
Step 205: this user is organized deletion 2 from the user, and forward step 206 to;
Step 206: whether also have the user not traveled through in the judges group 2, if, forward step 202 to, distribute otherwise finish dump power.
Next, be elaborated in conjunction with 3 pairs of said devices of the embodiment of the invention of accompanying drawing.
As shown in Figure 3, Fig. 3 is the structural representation of the said device of the embodiment of the invention, mainly comprises:
(1) dump power acquiring unit, main being responsible for carried out first power division to all users, and carries out power adjustment for the user that actual signal to noise ratio exceeds the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding, obtains dump power;
The dump power acquiring unit specifically can comprise:
First power division module is carried out first power division to all users;
Fall power model, the user that actual signal to noise ratio is exceeded the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding drops to it with the power of distributing to this user for the first time and can support the required power of high order modulation coded system;
The dump power statistical module for the power that has more after the first power division resume module, and falls the power that has more after power model is handled, and both obtain dump power at addition, and notify the dump power allocation units with dump power;
(2) dump power allocation units, main being responsible for given the dump power reasonable distribution actual signal to noise ratio do not exceed to support those users of the signal to noise ratio upper limit of high order modulation coded system correspondence, to reach the maximization of system throughput flow gain; As a specific embodiment of the present invention; Dump power is sent out allocation units can promote the one-level modulation coding mode to the size that can bring throughput gain on the single resource units according to the user; Come the throughput gain maximal criterion according to each resource units upper erengy band, preferentially said dump power is distributed to the user that can bring throughput gain maximum on the single resource units.
The dump power allocation units specifically can comprise:
Select module, do not exceed among the user of the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding, select to promote the one-level modulation coding mode and give the user that can bring the throughput gain maximum on the single resource units in actual signal to noise ratio;
First judge module; To selecting this this selected user of module to judge, judge that this user promotes the required power of one-level decode-regulating mode and whether is not more than said dump power, if; Distribute its required power in dump power, for this user, and upgrade the numerical value of dump power; Otherwise will not distribute;
Second judge module judges whether user that all actual signal to noise ratios do not exceed the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding all is selected module and selected, if, finish dump power and distribute, otherwise the triggering selection module.
In sum; The embodiment of the invention provides power distribution method and the device in a kind of orthogonal frequency division multiple access system, according to the characteristics of OFDMA system, and the combining with adaptive modulation encoding mode; Through obtaining to dump power; Come the throughput gain maximal criterion that dump power is distributed according to each resource units upper erengy band, the maximization of system throughput flow gain, and improved the efficient of power division.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (8)
1. the power distribution method in the orthogonal frequency division multiple access system is characterized in that, comprising:
Steps A: all users are carried out first power division, and the user that actual signal to noise ratio exceeds the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding is carried out the power adjustment, obtain dump power;
Step B:, preferentially said dump power is distributed to the user of the throughput gain maximum that can bring on the single resource units for the user that actual signal to noise ratio does not exceed the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding.
2. method according to claim 1 is characterized in that, said steps A specifically comprises:
All users are carried out first power division;
The user that actual signal to noise ratio is exceeded the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding drops to it with the power of distributing to this user for the first time and can support the required power of high order modulation coded system;
To pass through power that has more after the first power division and the power that will distribute to this user for the first time drops to it and can support to add the power that has more behind the required power of high order modulation coded system together as dump power.
3. method according to claim 1 and 2 is characterized in that, said step B specifically comprises:
Step B1: do not exceed among the user of the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding in actual signal to noise ratio, select to promote the one-level modulation coding mode and give the user that can bring the throughput gain maximum on the single resource units;
Step B2: the user who judges this selection promotes the required power of one-level decode-regulating mode and whether is not more than said dump power, if distribute its required power in said dump power, for this user, and upgrade said dump power; Otherwise will not distribute;
Step B3: judge whether all users that actual signal to noise ratio does not exceed the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding all were selected, if finish dump power and distribute, otherwise forward step B1 to.
4. method according to claim 1 is characterized in that, the throughput gain that can bring on the single resource units is meant, the user promotes the ratio of the number of throughput that one-level decode-regulating mode brought and this CU resource units.
5. the power distribution unit in the orthogonal frequency division multiple access system is characterized in that, comprising:
The dump power acquiring unit is used for all users are carried out first power division, and carries out the power adjustment for the user that actual signal to noise ratio exceeds the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding, obtains dump power;
The dump power allocation units are used for actual signal to noise ratio is not exceeded the user of the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding, preferentially said dump power are distributed to the user that can bring the throughput gain maximum on the single resource units.
6. device according to claim 5 is characterized in that, said dump power acquiring unit specifically comprises:
First power division module is used for all users are carried out first power division;
Fall power model, be used for actual signal to noise ratio is exceeded the user of the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding, the power of distributing to this user is for the first time dropped to it can support the required power of high order modulation coded system;
The dump power statistical module is used for power that has more after the said first power division resume module and the said power that has more after power model is handled that falls are added together as dump power.
7. according to claim 5 or 6 described devices, it is characterized in that said dump power allocation units specifically comprise:
Select module, be used for not exceeding the user of the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding, select to promote the one-level modulation coding mode and give the user that can bring the throughput gain maximum on the single resource units in actual signal to noise ratio;
First judge module; Be used for this selected user of said selection module is judged; Judge that this user promotes the required power of one-level decode-regulating mode and whether is not more than said dump power; If distribute its required power in said dump power, for this user, and upgrade said dump power; Otherwise will not distribute;
Second judge module; Be used to judge whether all users that actual signal to noise ratio does not exceed the signal to noise ratio upper limit that can support that high order modulation coded system is corresponding were all selected by said selection module; If finish dump power and distribute, otherwise trigger said selection module.
8. device according to claim 5 is characterized in that, the throughput gain that can bring on the single resource units is meant, the user promotes the ratio of the number of throughput that one-level decode-regulating mode brought and this CU resource units.
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| CN113645684A (en) * | 2020-05-11 | 2021-11-12 | 大唐移动通信设备有限公司 | Downlink power self-adaptive distribution method, device, apparatus and storage medium |
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Application publication date: 20120314 |