CN103916948A - Method and device for power control - Google Patents
Method and device for power control Download PDFInfo
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- CN103916948A CN103916948A CN201310006155.1A CN201310006155A CN103916948A CN 103916948 A CN103916948 A CN 103916948A CN 201310006155 A CN201310006155 A CN 201310006155A CN 103916948 A CN103916948 A CN 103916948A
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Abstract
The invention discloses a method for power control. The method comprises the steps that a power alternative set is set, wherein the power alternative set is a set of power values adopted in transmission cooperation points in a transmission cooperation set in the data transmission process and comprises a full power value and at least one reduced power value between the full power value and zero power; the full power value is selected to serve as a transmitting power value of the first transmission cooperation point in the transmission cooperation set; according to the transmission cooperation points except for the first transmission cooperation point in the transmission cooperation set, each power value is selected from the power alternative set to serve as the transmitting power value of the corresponding transmission cooperation point. The invention further discloses the device for power control. Due to the fact that the transmitting power values can be selected from the power alternative set for the transmission cooperation points except for the first transmission cooperation point, the purpose that the resource use rate is improved as much as possible under the condition that interference between the transmission cooperation points is controlled is achieved.
Description
Technical field
The application relates to the cooperative multipoint transmission technology (Coordinated Multiple Point, CoMP) of mobile radio communication, particularly in CoMP system, multiple cooperative transmission points in a cooperative transmission collection is carried out to Poewr control method and device.
Background technology
Cellular mobile telephone brings great convenience to people's communication, and second generation global system for mobile communications (Global System for Mobile Communication, GSM) adopts digital communication, has further improved the speech quality of mobile communication.Third generation partner program (3rd Generation Partnership Project, 3GPP) as the vital tissue of moving communicating field, greatly promote 3G (Third Generation) Moblie technology (The Third Generation, Standardization 3G), a series of Wideband Code Division Multiple Access (WCDMA) access (Wide Code Division Multiple Access that comprise are formulated, WCDMA), high speed downlink packet access (High Speed Downlink Packet Access, HSDPA), high speed uplink packet access (High Speed Uplink Packet Access, etc. HSUPA) in interior communication system standard.
In order to tackle the challenge of broadband access technology, and meet the demand of growing new business, 3GPP will have started 3G Long Term Evolution (Long Term Evolution in the end of the year 2004, LTE) standardization effort of technology, wish further to improve spectrum efficiency, improve the performance of Cell Edge User, reduce system delay, for high-speed mobile user provides the access service etc. of higher rate.Following advanced LTE(LTE-Advanced, LTE-A) technology on the basis of LTE, promotes heterogeneous network especially, and several times increase spectral bandwidth, significantly improve data rate, for more mobile subscribers provide the service of higher rate, better performance.
CoMP, as improving one of important technology of community marginal user performance, is introduced in LTE-A.The main thought of CoMP technology is to set up a cooperative transmission collection that comprises multiple cooperative transmission points, the transfer of data that cooperated of all cooperative transmission points in this cooperative transmission collection.CoMP technology comprises multiple cooperative mode, for example Combined Treatment (Joint processing, JP) and cooperative scheduling/cooperative beam figuration (Coordinated Scheduling/Coordinated Beamforming, CS/CB).In JP mode, user's transmission data will be got ready at multiple cooperative transmission points of cooperative transmission collection in advance in advance.JP is divided into again joint transmission (Joint Transmission, JT) and two kinds of modes of dynamic transmission point selection (Dynamic Point Selection, DPS).Wherein, JT refers to that multiple cooperative transmission points above transmit data for identical user at identical Resource Block (Resource Block, RB).DPS refers to that each moment only has a cooperative transmission point to transmit data to user, and other cooperative transmission point is on identical RB, and data or the power that can transmit other user are 0.Wherein, if other cooperative transmission point transmits other user's data on identical RB, now claim single cell transmission mode for this cooperative transmission centralized procurement; If the power of other cooperative transmission point on identical RB is zero, now claim this cooperative transmission centralized procurement dynamic transmission point blank (Dynamic Point Blanking, DPB) transmission means.In actual application, employing can be combined use DPS and DPB transmission means conventionally, for example, if cooperative transmission collection comprises two transfer point (Transmission Point, TP) TP0 and TP1, in the time adopting DPS/DPB mode, can select TP0 transmission data the first Transmission Time Interval (Transmission Time Interval, TTI) user, and strong interferers TP1 configures zero energy on this RB.And at the 2nd TTI, user can select TP1 transmission data, and strong interferers TP0 at this RB in configuration zero energy.Clearly, adopt DPB transmission means because the power of other cooperative transmission points is 0, therefore can greatly reduce the interference between cooperation transmission point, but also can reduce the utilance of resource simultaneously.
Summary of the invention
In order to address the above problem, embodiments of the invention have proposed a kind of Poewr control method, can take into account between cooperative transmission point and disturb and resource utilization, can in the situation that disturbing between control cooperative transmission point, improve the utilance of resource as far as possible.
The Poewr control method that the embodiment of the present invention proposes, comprising:
An alternative set of power is set, and wherein, the alternative set of described power is the set of the performance number that adopts in the time of transfer of data of the cooperative transmission point in cooperative transmission collection, comprises total power and at least one the reduction power between total power and zero energy;
Select the transmitting power of total power as the first cooperative transmission point in cooperative transmission collection; And
Concentrate each other cooperative transmission point except the first cooperative transmission point from the alternative set of described power, to select respectively a performance number as its transmitting power for cooperative transmission.
Concentrate each other cooperative transmission point except the first cooperative transmission point from the alternative set of described power, to select respectively a performance number to comprise as its transmitting power for cooperative transmission: from the alternative set of described power, be respectively each described in performance number of other cooperative transmission point selection make the transmission priority sum maximum of all cooperative transmission points institute dispatched users in whole cooperative transmission collection as its transmitting power.
The Poewr control method that another embodiment of the present invention proposes comprises:
The alternative set of the first power and the alternative set of the second power are set, wherein, the alternative set of the first power and the alternative set of the second power are the set of the performance number that in cooperative transmission collection, cooperative transmission point adopts in the time of transfer of data, the alternative set of the first power comprises total power and zero energy, and the alternative set of the second power comprises total power and at least one the reduction power between total power and zero energy;
Select total power to concentrate the transmitting power of the first cooperative transmission point as cooperative transmission;
Calculate the difference of channel characteristics parameter corresponding to cooperative transmission collection first cooperative transmission point institute dispatched users in the time adopting dynamic transmission to put blank transmission means and adopt single cell transmission mode;
In the time that this difference is greater than predetermined threshold value, using the alternative set of the first power as the alternative set of candidate's power; Otherwise, using the alternative set of the second power as the alternative set of candidate's power; And
Concentrate each other cooperative transmission point except the first cooperative transmission point from the alternative set of described candidate's power, to select a performance number as its transmitting power respectively for cooperative transmission.
Wherein, channel characteristics parameter comprises: channel quality indication (CQI), signal to noise ratio (snr), signal to interference and noise ratio (SINR), Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ).
Concentrate each other cooperative transmission point except the first cooperative transmission point from the alternative set of described candidate's power, to select a performance number to comprise as its transmitting power respectively for cooperative transmission: from described candidate state the alternative set of power, be respectively each described in performance number of other cooperative transmission point selection make the transmission priority sum maximum of all cooperative transmission points institute dispatched users in whole cooperative transmission collection as its transmitting power.
Performance number of above-mentioned selection comprises: calculate respectively the interior all scheduled users of cooperative transmission collection at the transmission priority under various transmission meanss for cooperative transmission centralized procurement; For every kind of transmission means, calculate respectively under this transmission means all scheduled users' transmission priority sum in cooperative transmission collection; Selection makes the transmission means of above-mentioned transmission priority sum maximum and scheduling result transmission means and the scheduling result as cooperative transmission collection, and each user's transmitting power in definite cooperative transmission collection.
Above-mentionedly calculate respectively all scheduled users in cooperative transmission collection and comprise at the transmission priority of cooperative transmission centralized procurement under various transmission meanss: for each transmission means, the transmission rate that the CQI under described transmission means can support with all scheduled users respectively divided by the past period in the throughput that is transmitted of described user obtain described user's transmission priority.
In cooperative transmission centralized procurement when reducing power delivery mode, the CQI of the first cooperative transmission point institute dispatched users according to cooperative transmission centralized procurement during by single cell transmission mode described in the user's that dispatches of the first cooperative transmission point CQI, cooperative transmission centralized procurement dynamic transmission while putting blank transmission means described in the CQI, reduction power and the total power of other cooperative transmission points employings except described the first cooperative transmission point of the first cooperative transmission point institute dispatched users calculate; In cooperative transmission centralized procurement when reducing power delivery mode, the CQI of described other cooperative transmission point institute dispatched users according to cooperative transmission centralized procurement during by single cell transmission mode described in the user's that dispatches of other cooperative transmission points CQI, reduction power and the total power of described other cooperative transmission points employings calculate.
Said method further comprises: cooperative transmission point is by the performance number of radio resource control RRC signaling and/or the current use of its dispatched users of Downlink Control Information DCI signaling.
Said method further comprises: put the performance number of the current use of its dispatched users by each cooperative transmission in signaling cooperative transmission collection.
The output control device that the embodiment of the present invention provides comprises:
The alternative set of power arranges module, be used for arranging an alternative set of power, wherein, the alternative set of described power is the set of the performance number that adopts in the time of transfer of data of the cooperative transmission point in cooperative transmission collection, at least comprises total power and at least one the reduction power between total power and zero energy; And
Performance number determination module, for selecting total power to concentrate the transmitting power of the first cooperative transmission point as cooperative transmission, and concentrate other cooperative transmission point except the first cooperative transmission point from the alternative set of above-mentioned power, to select respectively a performance number as its transmitting power for above-mentioned cooperative transmission.
Above-mentioned performance number determination module comprises:
Transmission priority determining unit, for calculating respectively the interior all scheduled users of cooperative transmission collection at the transmission priority under various transmission meanss for cooperative transmission centralized procurement, and for every kind of transmission means, calculate respectively under this transmission means all scheduled users' transmission priority sum in cooperative transmission collection; And
Selected cell, for selecting to make the transmission means of above-mentioned transmission priority sum maximum and scheduling result transmission means and the scheduling result as cooperative transmission collection, and each user's transmitting power in definite cooperative transmission collection.
The output control device that another embodiment of the present invention provides comprises:
The alternative set of the second power arranges module, be used for arranging the alternative set of the first power and the alternative set of the second power, wherein, the alternative set of the first power and the alternative set of the second power are the set of the performance number that in cooperative transmission collection, cooperative transmission point adopts in the time of transfer of data, the alternative set of the first power comprises total power and zero energy, and the alternative set of the second power comprises total power and at least one the reduction power between total power and zero energy;
The alternative Resource selection module of power, for calculating the difference of defeated collaboration set channel characteristics parameter of the first cooperative transmission point institute dispatched users in the time adopting dynamic transmission to put blank transmission means and adopt single cell transmission mode, in the time that this difference is greater than predetermined threshold value, using the alternative set of the first power as the alternative set of candidate's power; In the time that this difference is less than or equal to predetermined threshold value, using the alternative set of the second power as the alternative set of candidate's power; And
The second performance number determination module, for selecting total power to concentrate the transmitting power of the first cooperative transmission point as cooperative transmission, and concentrate each other cooperative transmission point except the first cooperative transmission point from the alternative set of described candidate's power, to select a performance number as its transmitting power respectively for cooperative transmission.
Above-mentioned the second performance number determination module comprises:
Transmission priority determining unit, for calculating respectively the interior all scheduled users of cooperative transmission collection at the transmission priority under various transmission meanss for cooperative transmission centralized procurement, and for every kind of transmission means, calculate respectively under this transmission means all scheduled users' transmission priority sum in cooperative transmission collection; And
Selected cell, for selecting to make the transmission means of above-mentioned transmission priority sum maximum and scheduling result transmission means and the scheduling result as cooperative transmission collection, and each user's transmitting power in definite cooperative transmission collection.
As previously mentioned, because cooperative transmission is concentrated other cooperative transmission points except the first cooperative transmission point can select the transmitting power of self from the alternative set of power, therefore, in the time that above-mentioned other cooperative transmission points adopt the reduction power between total power and zero energy, and can reduce the interference between cooperative transmission point compared with the single cell transmission mode of employing; And compared with it adopts DPB transmission means, can improve resource utilization, thereby realize the object that as far as possible improves the utilance of resource in the situation that disturbing between control cooperative transmission point.
Accompanying drawing explanation
Fig. 1 is the Poewr control method flow chart described in one embodiment of the invention;
Fig. 2 is the method flow diagram of the performance number of selection described in the embodiment of the present invention;
Fig. 3 is the Poewr control method flow chart described in another embodiment of the present invention;
Fig. 4 is the output control device internal structure schematic diagram described in one embodiment of the invention; And
Fig. 5 is the output control device internal structure schematic diagram described in another embodiment of the present invention.
Embodiment
In order to address the above problem, embodiments of the invention provide a kind of Poewr control method.As shown in Figure 1, the method comprises the steps:
Step 101: an alternative set of power (Power Pool) is set.
In the present embodiment, first introduce the concept of the alternative set of power (Power Pool).The alternative set of power is the set of the performance number that can adopt in the time of transfer of data of the cooperative transmission point in cooperative transmission collection, and this set at least can comprise total power and at least one the reduction power (Reduced Power) between total power and zero energy.The alternative set of above-mentioned power can also comprise zero energy.For example, if the total power of a cooperative transmission point is 40w, the alternative set of power can comprise following performance number { 0w, 10w, 20w, 30w, 40w}, or comprise following performance number { 0w, 20w, 40w}, or comprise following performance number { 20w, 40w}.
Step 102: select the transmitting power of total power as the first cooperative transmission point in cooperative transmission collection;
In the present embodiment, above-mentioned the first cooperative transmission point is main cooperative transmission point, and in cooperative transmission collection, other cooperative transmission point except the first cooperative transmission point is from cooperative transmission point.
Step 103: concentrate other cooperative transmission point except the first cooperative transmission point to select respectively a performance number as its transmitting power from the alternative set of above-mentioned power for above-mentioned cooperative transmission.
Next, the first cooperative transmission point that this cooperative transmission is concentrated just can use total power to send data for first user, and other cooperative transmission point can be just that other users except first user send data according to selected performance number.
Particularly, if above-mentioned other cooperation points are also selected total power in the alternative set of the power transmitting power as self, actual what adopt is single cell transmission mode to this cooperative transmission collection; If the zero energy in the alternative set of above-mentioned other cooperation points selection power is as the transmitting power of self, the actual employing of this cooperative transmission collection is DPB transmission means.And if one of above-mentioned other cooperation points select one in the alternative set of power to reduce the transmitting power of power as self, in the present invention, claim this transmission means for reducing power delivery mode.In addition,, owing to may comprising multiple reduction power in the alternative set of power, therefore, the reduction power delivery mode that cooperative transmission collection can be selected also has multiple.
Pass through said method, in the time that reduction power delivery mode is used in cooperative transmission centralized procurement, because the transmitting power of at least one other cooperative transmission point except the first cooperative transmission point in cooperative transmission collection is between zero energy and total power, therefore and its adopt compared with single cell transmission mode and can reduce the interference between cooperative transmission point; And compared with it adopts DPB transmission means, can improve resource utilization.
Described in describing above-mentioned steps 103 in detail, from the alternative set of above-mentioned power, select the method for a performance number as the transmitting power of concentrated other cooperative transmission point except the first cooperative transmission point of this cooperative transmission below.
In the present embodiment, for the basic principle of cooperative transmission point selection transmission power level is exactly to make whole cooperative transmission concentrate scheduled user's transmission priority sum maximum, also in the situation that of multi-plot joint dispatching, make all users' that are scheduled transmission priority sum maximum.Particularly, the alleged transmission priority of the present embodiment is a kind of dispatching priority, and its computational methods are relevant with concrete dispatching method, is also dispatching method difference, and above-mentioned transmission priority computational methods are also different.For example, if the dispatching method of adoption rate justice (Proportional Fair, PF), the transmission rate that a user's transmission priority can be supported for the current channel condition of this user and the business of the throughput that in the past period, this user is transmitted.Particularly, a current channel condition of user can be weighed in order to one of lower channel characteristic parameter: channel quality indication (CQI), signal to noise ratio (snr) and signal to interference and noise ratio (SINR) etc.For example, if a current channel condition of user weigh with the current CQI of this user, the transmission rate that a user's transmission priority can be supported for this user's current C QI and the business of the throughput that in the past period, this user is transmitted.As can be seen here, in this case, for cooperative transmission point selection transmission power level concrete grammar is with regard to as shown in Figure 2, mainly comprise the steps:
Step 1031: calculate respectively the interior all scheduled users of cooperative transmission collection at the transmission priority under various transmission meanss for cooperative transmission centralized procurement;
Take with CQI as weighing the channel characteristics parameter of channel condition as example, concrete computational methods be for each transmission means transmission rate that the CQI under this transmission means can support with user divided by the past period in the throughput that is transmitted of this user;
Step 1032: for every kind of transmission means, calculate respectively under this transmission means all scheduled users' transmission priority sum in cooperative transmission collection;
Step 1033: select to make the transmission means of above-mentioned transmission priority sum maximum and scheduling result transmission means and the scheduling result as cooperative transmission collection, and each user's transmitting power in definite cooperative transmission collection.
To describe the method for cooperative transmission point selection performance number in detail by a concrete example below.In this example, cooperative transmission collection comprises two cooperative transmission points: the first cooperative transmission point and the second cooperative transmission point.The alternative set of power is { 0w, 10w, 20w, 30w, 40w}.The transmission means that can adopt one of cooperative transmission collection has 5 kinds, comprise: single cell transmission mode (transmitting power of the first cooperative transmission point and the second cooperative transmission point is all total power 40w), (transmitting power of the first cooperative transmission point is total power 40w to DPB transmission means, the transmitting power of the second cooperative transmission point is zero energy 0w) and three kinds of reduction power delivery modes (transmitting power of the first cooperative transmission point is total power 40w, and the transmitting power of the second cooperative transmission point is respectively 10w, 20w and 40w).Carry out again the method shown in above-mentioned Fig. 2 below.In step 1031, all users that definite the first cooperative transmission point and the second cooperative transmission point are dispatched are respectively at the CQI under above-mentioned 5 kinds of transmission meanss for cooperative transmission centralized procurement.Then,, in step 1032, according to the computational methods of transmission priority, calculate respectively all users that the first cooperative transmission point and the second cooperative transmission point dispatch at the transmission priority under above-mentioned 5 kinds of transmission meanss for cooperative transmission centralized procurement.Next,, in step 1033, for each in transmission means in above-mentioned 5, calculate respectively all users' that the first cooperative transmission point and the second cooperative transmission point are dispatched under this transmission means transmission priority sum.Finally, in step 1034, selection makes the transmission means of above-mentioned transmission priority sum maximum as the transmission means of cooperative transmission collection, for example, if be total power 40w in the transmitting power of the first cooperative transmission point, when the transmitting power of the second cooperative transmission point is 20w, the first cooperative transmission point and the second cooperative transmission point institute dispatching office have user's transmission priority sum maximum, can determine the under powered transmission mode of cooperative transmission centralized procurement, and the transmitting power of the first cooperative transmission point is total power 40w, the transmitting power of the second cooperative transmission point is 20w.
But because in existing CoMP system existing protocol has only stipulated that cooperative transmission collection is in the method that adopts user feedback CQI under single cell transmission mode and DPB transmission means, and the method for user feedback CQI while not being defined in the various reduction power delivery mode of cooperative transmission centralized procurement.Therefore,, in order to determine that respectively in cooperative transmission collection, all scheduled users are at the CQI under various transmission meanss for cooperative transmission centralized procurement, each cooperative transmission point also needs to carry out CQI renewal.As following table 1 has shown in single cell transmission mode, DPB transmission means for cooperative transmission centralized procurement and has reduced under power delivery mode the basic calculating formula of the CQI of the first cooperative transmission point in cooperative transmission collection and other cooperative transmission points (being called the second cooperative transmission point) institute's dispatched users.
Table 1
Wherein, CQI
s1the CQI of the first cooperative transmission point institute dispatched users during by single cell transmission mode for cooperative transmission centralized procurement; CQI
s2the CQI of the second cooperative transmission point institute dispatched users during by single cell transmission mode for cooperative transmission centralized procurement; CQI
bthe CQI of the first cooperative transmission point institute dispatched users while using DPB transmission means for cooperative transmission centralized procurement, now the CQI of the second cooperative transmission point institute dispatched users is 0; CQI
r1the CQI of the first cooperative transmission point institute dispatched users while using reduction power delivery mode for cooperative transmission centralized procurement; CQI
r2the CQI of the second cooperative transmission point institute dispatched users while using reduction power delivery mode for cooperative transmission centralized procurement; S
1the user's who dispatches for the first cooperative transmission point signal; S
2the user's who dispatches for the second cooperative transmission point signal; I is from the interference outside cooperative transmission collection; N is noise; Tx
rbe the reduction power that the second cooperative transmission point can adopt; Tx
fit is the total power that the second cooperative transmission point can adopt.
Formula in above-mentioned table 1 is derived and can be obtained following formula (1) and (2):
Can be found out by above-mentioned formula (1) and (2), at known CQI
s1, CQI
s2, CQI
band Tx
rand Tx
fsituation under, can calculate in the time that cooperative transmission centralized procurement reduces power delivery mode with each according to above-mentioned formula (1) and (2) the first cooperative transmission point and CQI corresponding to the second cooperative transmission point institute dispatched users.
That is to say, in cooperative transmission centralized procurement, when reducing power delivery mode, the reduction power of the CQI of the first cooperative transmission point institute dispatched users when the CQI of the first cooperative transmission point institute dispatched users user's that the first cooperative transmission point is dispatched during by single cell transmission mode according to cooperative transmission centralized procurement CQI, cooperative transmission centralized procurement dynamic transmission put blank transmission means, other cooperative transmission points employings except the first cooperative transmission point and the total power that cooperative transmission point can adopt calculate; In cooperative transmission centralized procurement, when reducing power delivery mode, the CQI of other cooperative transmission point institute dispatched users except the first cooperative transmission point the user's that other cooperative transmission points are dispatched during by single cell transmission mode according to cooperative transmission centralized procurement CQI, the reduction power of other cooperative transmission points employings and the total power that cooperative transmission point can adopt calculate.
It will be appreciated by those skilled in the art that, because the second cooperative transmission point except the first cooperative transmission point in cooperative transmission collection in said method can select to reduce the transmitting power of power as self, therefore can take into account interference and the resource utilization between cooperative transmission point simultaneously, realize the object that as far as possible improves the utilance of resource in the situation that disturbing between control cooperative transmission point.
In said method, describe as an example of CQI example, as previously mentioned, can also be by other channel characteristics parameters, for example SNR, SINR, Reference Signal Received Power (Reference Signal Received Power, RSRP) or Reference Signal Received Quality (Reference Signal Received Quality, RSRQ) etc. replace above-mentioned CQI.Concrete grammar can, with reference to the method for CQI, just repeat no more.
In addition,, in upper example, cooperative transmission collection only includes two cooperative transmission points.But the method for the present embodiment is not limited to this kind of situation, that is to say, cooperative transmission collection can comprise two or more cooperative transmission points.Especially, in the time of other cooperative transmission point selection transmitting powers for except the first cooperative transmission point, each other cooperative transmission points are independently, are not subject to the impact of other cooperative transmission points.
In above-mentioned example, if because optional performance number in the alternative set of power is too many, the computation complexity can cause the scheduling of cooperative transmission point time increases.Therefore, the complexity while scheduling in order to reduce cooperative transmission point, can suitably reduce the performance number number in the alternative set of power.For example, by power power that alternative set comprises 0w, 10w, 20w, 30w, 40w} changes to { 0w, 20w, 40w}, or further change to { 20w, 40w}.
In addition, can find by statistics, in the time that the difference of the CQI of cooperative transmission centralized procurement first cooperative transmission point institute dispatched users during by DPB transmission means CQI of the first cooperative transmission point institute dispatched users when when the single cell transmission mode of cooperative transmission centralized procurement is greater than 13dB, the overwhelming majority's situations have been selected DPB transmission means.Based on above-mentioned statistics, an alternative embodiment of the invention has proposed a kind of alternative Poewr control method, and as shown in Figure 3, the method mainly comprises the steps:
Step 301: the alternative set of the first power and the alternative set of the second power are set.
Wherein, the alternative set of the first power and the alternative set of the second power are the set of the performance number that in cooperative transmission collection, cooperative transmission point can adopt in the time of transfer of data; Wherein the alternative set of the first power comprises total power and zero energy, and the alternative set of the second power comprises total power and at least one the reduction power between total power and zero energy.The alternative set of above-mentioned the second power can further include zero energy.
Step 302: select total power to concentrate the transmitting power of the first cooperative transmission point as cooperative transmission.
Step 303: the difference of the channel characteristics parameter (for example CQI) of institute's dispatched users in the first cooperative transmission point when calculating cooperative transmission collection in employing DPB transmission means and adopting single cell transmission mode.
Step 304: in the time that this difference is greater than predetermined threshold value, using the alternative set of the first power as the alternative set of candidate's power; Otherwise, using the alternative set of the second power as the alternative set of candidate's power.
Above-mentioned predetermined threshold value can dynamically determine according to statistics, and for example, if above-mentioned channel characteristics parameter is CQI, above-mentioned predetermined threshold value can be 13dB.
Step 305: concentrate each other cooperative transmission point except the first cooperative transmission point to select a performance number as its transmitting power from the alternative set of described candidate's power respectively for cooperative transmission.
System of selection described in this step 305 can adopt the method as shown in above-mentioned steps 1031-1034.
In order further to reduce computation complexity and the signaling consumption of cooperative transmission point, can further reduce the number of performance number in the alternative set of the second power.
Owing to having introduced the alternative set of power in the method described in above-mentioned two embodiment, therefore need to utilize that relevant signaling goes notification transmission cooperation point and the current use of user is that performance number.For example, between cooperative transmission point, if comprise 2 non-zero power values in the alternative set of power, such as 40w and 20w, can indicate the second cooperative transmission point to adopt which performance number with 1bit, such as " 0 " represents 40w, " 1 " represents 20w.In the time that the alternative set-inclusion of power has 3 or 4 non-zero power values, need 2bit to indicate the second cooperative transmission point to adopt which performance number.
In addition, cooperative transmission point need to notify its scheduling the current use of user be which performance number.Particularly can adopt multiple Notification Method, for example, cooperative transmission point utilizes Radio Resource control (Radio Resource Control, RRC) which performance number the current use of user of signaling and/or Downlink Control Information (Downlink Control Information, DCI) its scheduling of signaling is.Particularly, can be directly by RRC signaling or DCI signaling provide the performance number of current use or with this power and flat-out ratio; Or indicate the alternative set of power of current use by RRC signaling, and be which power (for example for each performance number, an index being set, the index of the power of the current use of DCI signaling user) in the alternative set of power by the current use of DCI signaling user.
It should be noted that, the disclosed method of above-described embodiment can be applied to various CoMP cooperation modes, as DPS or JT etc.
Corresponding above-mentioned Poewr control method, embodiments of the invention also provide the output control device of carrying out above-mentioned Poewr control method.Fig. 4 has shown the internal structure of the output control device described in one embodiment of the invention.As shown in Figure 4, this output control device mainly comprises:
The alternative set of power arranges module 401, for an alternative set of power is set; The alternative set of this power at least can comprise total power and at least one the reduction power between total power and zero energy.The alternative set of above-mentioned power can also comprise zero energy.
Performance number determination module 402, for selecting total power to concentrate the transmitting power of the first cooperative transmission point as cooperative transmission, and concentrate other cooperative transmission point except the first cooperative transmission point from the alternative set of above-mentioned power, to select respectively a performance number as its transmitting power for above-mentioned cooperative transmission.
As previously mentioned, to select the basic principle of performance number be exactly the transmission priority sum maximum that makes institute's dispatched users in cooperative transmission collection to above-mentioned performance number determination module 402.
Particularly, above-mentioned performance number determination module 402 can comprise:
Transmission priority determining unit, for calculating respectively the interior all scheduled users of cooperative transmission collection at the transmission priority under various transmission meanss for cooperative transmission centralized procurement, and for every kind of transmission means, calculate respectively under this transmission means all scheduled users' transmission priority sum in cooperative transmission collection.Take with CQI as weighing the channel characteristics parameter of channel condition as example, concrete computational methods be for each transmission means transmission rate that the CQI under this transmission means can support with user divided by the past period in the throughput that is transmitted of this user.Wherein, the update method of CQI can be with reference to above-mentioned formula (1) and (2).
Selected cell, for selecting to make the transmission means of above-mentioned transmission priority sum maximum and scheduling result transmission means and the scheduling result as cooperative transmission collection, and each user's transmitting power in definite cooperative transmission collection.
In order to reduce the computation complexity of cooperative transmission point, an alternative embodiment of the invention also provides a kind of output control device.As shown in Figure 5, this device comprises:
The alternative set of the second power arranges module 501, for the alternative set of the first power and the alternative set of the second power are set;
Wherein, the total power that the alternative set of the first power is cooperative transmission point and the set of zero energy; The alternative set of the second power is the set of the performance number that in cooperative transmission collection, cooperative transmission point can adopt in the time of transfer of data, at least comprises total power and at least one the reduction power between total power and zero energy.The alternative set of above-mentioned the second power can further include zero energy.
The alternative Resource selection module 502 of power, for example, for calculating the difference of defeated collaboration set channel characteristics parameter (CQI) of the first cooperative transmission point institute dispatched users in the time adopting DPB transmission means and adopt single cell transmission mode, in the time that this difference is greater than predetermined threshold value, using the alternative set of the first power as the alternative set of candidate's power; In the time that this difference is less than or equal to predetermined threshold value, using the alternative set of the second power as the alternative set of candidate's power.
The second performance number determination module 503, for selecting total power to concentrate the transmitting power of the first cooperative transmission point as cooperative transmission, and concentrate each other cooperative transmission point except the first cooperative transmission point from the alternative set of described candidate's power, to select a performance number as its transmitting power respectively for cooperative transmission.
It should be noted that, now, above-mentioned the second performance number determination module 503 also can comprise above-mentioned transmission priority determining unit and selected cell.
In addition it should be noted that, in actual application, above-mentioned two kinds of output control devices can be arranged in main cooperative transmission point.
As previously mentioned, when cooperative transmission centralized procurement is when reducing power delivery mode, and it adopts compared with single cell transmission mode and can reduce the interference between cooperative transmission point; And compared with it adopts DPB transmission means, can improve resource utilization.Therefore, realize and in the situation that disturbing between control cooperative transmission point, improve as far as possible resource utilization by method and apparatus of the present invention.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (14)
1. a Poewr control method, is characterized in that, comprising:
An alternative set of power is set, and wherein, the alternative set of described power is the set of the performance number that adopts in the time of transfer of data of the cooperative transmission point in cooperative transmission collection, comprises total power and at least one the reduction power between total power and zero energy;
Select the transmitting power of total power as the first cooperative transmission point in cooperative transmission collection; And
Concentrate each other cooperative transmission point except the first cooperative transmission point from the alternative set of described power, to select respectively a performance number as its transmitting power for cooperative transmission.
2. Poewr control method according to claim 1, it is characterized in that, concentrate each other cooperative transmission point except the first cooperative transmission point from the alternative set of described power, to select respectively a performance number to comprise as its transmitting power for cooperative transmission: from the alternative set of described power, be respectively each described in performance number of other cooperative transmission point selection make the transmission priority sum maximum of all cooperative transmission points institute dispatched users in whole cooperative transmission collection as its transmitting power.
3. a Poewr control method, is characterized in that, comprising:
The alternative set of the first power and the alternative set of the second power are set, wherein, the alternative set of the first power and the alternative set of the second power are the set of the performance number that in cooperative transmission collection, cooperative transmission point adopts in the time of transfer of data, the alternative set of the first power comprises total power and zero energy, and the alternative set of the second power comprises total power and at least one the reduction power between total power and zero energy;
Select total power to concentrate the transmitting power of the first cooperative transmission point as cooperative transmission;
Calculate the difference of channel characteristics parameter corresponding to cooperative transmission collection first cooperative transmission point institute dispatched users in the time adopting dynamic transmission to put blank transmission means and adopt full power transmission mode;
In the time that this difference is greater than predetermined threshold value, using the alternative set of the first power as the alternative set of candidate's power; Otherwise, using the alternative set of the second power as the alternative set of candidate's power; And
Concentrate each other cooperative transmission point except the first cooperative transmission point from the alternative set of described candidate's power, to select a performance number as its transmitting power respectively for cooperative transmission.
4. Poewr control method according to claim 3, is characterized in that, described channel characteristics parameter comprises: channel quality indicator (CQI), signal to noise ratio snr, signal to interference and noise ratio SINR, Reference Signal Received Power RSRP or Reference Signal Received Quality RSRQ.
5. Poewr control method according to claim 3, it is characterized in that, concentrate each other cooperative transmission point except the first cooperative transmission point from the alternative set of described candidate's power, to select a performance number to comprise as its transmitting power respectively for cooperative transmission: from described candidate state the alternative set of power, be respectively each described in performance number of other cooperative transmission point selection make the transmission priority sum maximum of all cooperative transmission points institute dispatched users in whole cooperative transmission collection as its transmitting power.
6. according to the Poewr control method described in claim 2 or 5, it is characterized in that, performance number of described selection comprises:
Calculate respectively the interior all scheduled users of cooperative transmission collection at the transmission priority under various transmission meanss for cooperative transmission centralized procurement;
For every kind of transmission means, calculate respectively under this transmission means all scheduled users' transmission priority sum in cooperative transmission collection;
Selection makes the transmission means of above-mentioned transmission priority sum maximum and scheduling result transmission means and the scheduling result as cooperative transmission collection, and each user's transmitting power in definite cooperative transmission collection.
7. Poewr control method according to claim 6, it is characterized in that, describedly calculate respectively all scheduled users in cooperative transmission collection and comprise at the transmission priority of cooperative transmission centralized procurement under various transmission meanss: for each transmission means, the transmission rate that the CQI under described transmission means can support with all scheduled users respectively divided by the past period in the throughput that is transmitted of described user obtain described user's transmission priority.
8. Poewr control method according to claim 7, it is characterized in that, in cooperative transmission centralized procurement when reducing power delivery mode, the CQI of the first cooperative transmission point institute dispatched users according to cooperative transmission centralized procurement during by single cell transmission mode described in the user's that dispatches of the first cooperative transmission point CQI, cooperative transmission centralized procurement dynamic transmission while putting blank transmission means described in the CQI, reduction power and the total power of other cooperative transmission points employings except described the first cooperative transmission point of the first cooperative transmission point institute dispatched users calculate;
In cooperative transmission centralized procurement when reducing power delivery mode, the CQI of described other cooperative transmission point institute dispatched users according to cooperative transmission centralized procurement during by single cell transmission mode described in the user's that dispatches of other cooperative transmission points CQI, reduction power and the total power of described other cooperative transmission points employings calculate.
9. according to the Poewr control method described in claim 1 or 3, it is characterized in that, further comprise: cooperative transmission point is by the performance number of radio resource control RRC signaling and/or the current use of its dispatched users of Downlink Control Information DCI signaling.
10. according to the Poewr control method described in claim 1 or 3, it is characterized in that, further comprise: put the performance number of the current use of its dispatched users by each cooperative transmission in signaling cooperative transmission collection.
11. 1 kinds of output control devices, is characterized in that, comprising:
The alternative set of power arranges module, be used for arranging an alternative set of power, wherein, the alternative set of described power is the set of the performance number that adopts in the time of transfer of data of the cooperative transmission point in cooperative transmission collection, at least comprises total power and at least one the reduction power between total power and zero energy; And
Performance number determination module, for selecting total power to concentrate the transmitting power of the first cooperative transmission point as cooperative transmission, and concentrate other cooperative transmission point except the first cooperative transmission point from the alternative set of above-mentioned power, to select respectively a performance number as its transmitting power for above-mentioned cooperative transmission.
12. output control devices as claimed in claim 11, is characterized in that, described performance number determination module comprises:
Transmission priority determining unit, for calculating respectively the interior all scheduled users of cooperative transmission collection at the transmission priority under various transmission meanss for cooperative transmission centralized procurement, and for every kind of transmission means, calculate respectively under this transmission means all scheduled users' transmission priority sum in cooperative transmission collection; And
Selected cell, for selecting to make the transmission means of above-mentioned transmission priority sum maximum and scheduling result transmission means and the scheduling result as cooperative transmission collection, and each user's transmitting power in definite cooperative transmission collection.
13. 1 kinds of output control devices, is characterized in that, comprising:
The alternative set of the second power arranges module, be used for arranging the alternative set of the first power and the alternative set of the second power, wherein, the alternative set of the first power and the alternative set of the second power are the set of the performance number that in cooperative transmission collection, cooperative transmission point adopts in the time of transfer of data, the alternative set of the first power comprises total power and zero energy, and the alternative set of the second power comprises total power and at least one the reduction power between total power and zero energy;
The alternative Resource selection module of power, for calculating the difference of defeated collaboration set channel characteristics parameter of the first cooperative transmission point institute dispatched users in the time adopting dynamic transmission to put blank transmission means and adopt single cell transmission mode, in the time that this difference is greater than predetermined threshold value, using the alternative set of the first power as the alternative set of candidate's power; In the time that this difference is less than or equal to predetermined threshold value, using the alternative set of the second power as the alternative set of candidate's power; And
The second performance number determination module, for selecting total power to concentrate the transmitting power of the first cooperative transmission point as cooperative transmission, and concentrate each other cooperative transmission point except the first cooperative transmission point from the alternative set of described candidate's power, to select a performance number as its transmitting power respectively for cooperative transmission.
14. output control devices as claimed in claim 13, is characterized in that, described the second performance number determination module comprises:
Transmission priority determining unit, for calculating respectively the interior all scheduled users of cooperative transmission collection at the transmission priority under various transmission meanss for cooperative transmission centralized procurement, and for every kind of transmission means, calculate respectively under this transmission means all scheduled users' transmission priority sum in cooperative transmission collection; And
Selected cell, for selecting to make the transmission means of above-mentioned transmission priority sum maximum and scheduling result transmission means and the scheduling result as cooperative transmission collection, and each user's transmitting power in definite cooperative transmission collection.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310006155.1A CN103916948A (en) | 2013-01-08 | 2013-01-08 | Method and device for power control |
| JP2014000891A JP2014135723A (en) | 2013-01-08 | 2014-01-07 | Power control method and device therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310006155.1A CN103916948A (en) | 2013-01-08 | 2013-01-08 | Method and device for power control |
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| JP2014135723A (en) | 2014-07-24 |
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