CN101599814A - Downlink transfer preprocess method and system in the collaboration communication - Google Patents

Abstract

The invention discloses downlink transfer preprocess method and system in a kind of collaboration communication.Wherein, this method comprises: main controlled node determines to adopt combined treatment procedure or the interior cooperative scheduling flow process of main controlled node between cooperative node; In the combined treatment procedure between cooperative node, each cooperative node obtains pre-coding matrix between node, and utilizes pre-coding matrix between node respectively each cooperative node to be carried out internodal precoding to a plurality of downstream data flows that subscriber equipment sends; In the cooperative scheduling flow process in main controlled node, main controlled node obtains the intranodal pre-coding matrix, and utilizes the intranodal pre-coding matrix respectively main controlled node to be carried out the precoding of intranodal to a plurality of downstream data flows that subscriber equipment sends.The present invention eliminates the correlation of mimo channel by the pre-coding matrix that obtains, and makes downstream data flow can adapt to descending channel circumstance, thereby improves descending joint transmission user or cooperative scheduling user's performance gain.

Description

Downlink transfer preprocess method and system in the collaboration communication

Technical field

The present invention relates to wireless communication system, more specifically, relate to downlink transfer preprocess method and system in a kind of collaboration communication.

Background technology

In next generation mobile communication system, (Cooperated Multipoint, CoMP) transmission technology is considered to a kind of effective ways that improve the Cell Edge User transmission performance to coordinate multipoint.Particularly, down collaboration multicast communication technology can be divided into two classes: (1) Combined Treatment/emission; (2) cooperative scheduling and/or beam shaping (Beam Forming).

In existing cooperative multipoint transmission The Application of Technology scene, the service node unit that user by selecting is different makes up cooperation cell bunch, carries out the Combined Treatment of minizone with this.The beam shaping Combined Treatment of many cooperation cell is not only brought lower lobe utilance, and extra same frequency lobe also can cause bigger interference, and this scheme is had relatively high expectations synchronously to the minizone beam shaping, and has stronger delay sensitive.

In existing sub-district in the down collaboration scheduling scheme, based on the cooperative scheduling method of beam shaping owing to there is the multi-beam collision problem of minizone, cause extra co-channel interference easily, and because the secondary lobe of the existing interference user of beam shaping technology self, makes that the performance gain that brings based on the descending Combined Treatment of beam shaping technology is limited to the co-channel interference of the main lobe of directed towards user.In addition, use the beam shaping technology also require antenna distance as half-wavelength to avoid occurring graing lobe.

In addition, the descending power allocative decision in the existing cooperative multipoint transmission mainly adopts the average power allocation mode.In this scheme, no matter be Cell Center User or Cell Edge User, the eNodeB of sub-district is user's mean allocation descending power, the power that a plurality of cooperative nodes distribute is also identical.

Summary of the invention

The technical problem that the present invention will solve provides downlink transfer preprocess method and the system in a kind of collaboration communication, not only for descending joint transmission user or cooperative scheduling user bring performance gain, and has avoided co-channel interference by pre-coding matrix.

To achieve these goals, the invention provides the downlink transfer preprocess method in a kind of collaboration communication, comprising: main controlled node is according to combined treatment procedure between the definite employing of the type cooperative node of the subscriber equipment in the overlay area of main controlled node or the cooperative scheduling flow process in the main controlled node; In the combined treatment procedure between cooperative node, each cooperative node obtain with each cooperative node to pre-coding matrix between the corresponding node of the current channel condition information of subscriber equipment, and utilize pre-coding matrix between node respectively each cooperative node to be carried out internodal precoding to a plurality of downstream data flows that subscriber equipment sends, wherein, comprise main controlled node in each cooperative node; In the cooperative scheduling flow process in main controlled node, main controlled node obtain with main controlled node to the corresponding intranodal pre-coding matrix of the current channel condition information of subscriber equipment, and utilize the intranodal pre-coding matrix respectively main controlled node to be carried out the precoding of intranodal to a plurality of downstream data flows that subscriber equipment sends.

An embodiment according to the inventive method, in the combined treatment procedure between cooperative node, comprise that also a plurality of downstream data flows that each cooperative node is sent to subscriber equipment carry out the step that descending power is regulated, comprise: calculate between cooperative node each by the descending power regulatory factor of Combined Treatment subscriber equipment, and according to the descending power of each a plurality of downstream data flow that sent to subscriber equipment by the descending power regulatory factor of Combined Treatment subscriber equipment and each cooperative node to each cooperative node of current channel condition information calculations of subscriber equipment between cooperative node.

Another embodiment according to the inventive method, in the cooperative scheduling flow process in main controlled node, comprise that also a plurality of downstream data flows that main controlled node is sent to subscriber equipment carry out the step that descending power is regulated, comprise: calculate in the main controlled node each by the descending power regulatory factor of cooperative scheduling subscriber equipment, and according to the descending power of each a plurality of downstream data flow that sent to subscriber equipment by the descending power regulatory factor of cooperative scheduling subscriber equipment and main controlled node to the current channel condition information calculations main controlled node of subscriber equipment in the main controlled node.

Above-mentioned two kinds of technical schemes can not only provide the performance gain that is brought by pre-coding matrix for subscriber equipment, and can also pass through descending power regulatory factor allocation of downlink power share, guaranteed the fairness of power division between each subscriber equipment and each cooperative node, can improve the resource utilization of whole system effectively, reduce internodal interference simultaneously.

Another embodiment according to the inventive method, in the combined treatment procedure between cooperative node, each cooperative node obtain as follows with each cooperative node to pre-coding matrix between the corresponding node of the current channel condition information of subscriber equipment: that each cooperative node calculates based on each cooperative node or calculate pre-coding matrix between corresponding node respectively from each cooperative node to the current channel condition information of subscriber equipment that subscriber equipment obtains; And/or each cooperative node is according to selecting pre-coding matrix between the node corresponding with precoding matrix indicators from the precoding matrix indicators of subscriber equipment from code book, wherein, precoding matrix indicators is to be determined based on each cooperative node to the current channel condition information of subscriber equipment by subscriber equipment.

Embodiment again according to the inventive method, in the cooperative scheduling flow process in main controlled node, main controlled node obtain as follows with main controlled node to the corresponding intranodal pre-coding matrix of the current channel condition information of subscriber equipment: that main controlled node calculates based on main controlled node or calculate corresponding intranodal pre-coding matrix respectively from main controlled node to the current channel condition information of subscriber equipment that subscriber equipment obtains; Or main controlled node is according to selecting the intranodal pre-coding matrix corresponding with precoding matrix indicators from the precoding matrix indicators of subscriber equipment from code book, wherein, precoding matrix indicators is to be determined based on main controlled node to the current channel condition information of subscriber equipment by subscriber equipment.

According to an embodiment again of the inventive method, a plurality of downstream data flows that each cooperative node is sent to subscriber equipment carry out the step that descending power regulates and specifically comprise: according to each by the thresholding Signal to Interference plus Noise Ratio of the current Signal to Interference plus Noise Ratio of Combined Treatment subscriber equipment and setting calculate be inversely proportional to by the current Signal to Interference plus Noise Ratio of Combined Treatment subscriber equipment with each each by the descending power regulatory factor β of Combined Treatment subscriber equipment; According to $P^{\left(i\right)}=\frac{{\mathrm{\β}}_i}{\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\β}}_k}.$ P ₀I is individual by the descending gross power of Combined Treatment subscriber equipment between the calculating cooperative node, wherein, and 1≤i≤n, β _iAnd β _kIt is individual individual by the descending power regulatory factor of Combined Treatment subscriber equipment with k to be respectively i, P ₀For between cooperative node by the descending gross power of all subscriber equipmenies of Combined Treatment, n is by the number of the subscriber equipment of Combined Treatment between cooperative node; According to ${\mathrm{PP}}_j=\frac{x_j}{\underset{k=1}{\overset{m}{\mathrm{\Σ}}}{x}_k}.$ P ⁽ⁱ⁾Calculate the descending power of the j road downstream data flow that j cooperative node send by the Combined Treatment subscriber equipment to i, wherein, 1≤j≤m, x _jAnd x _kBe respectively j cooperative node and k cooperative node current channel condition information, P to subscriber equipment ⁽ⁱ⁾Individual by the descending gross power of Combined Treatment subscriber equipment for i between cooperative node, m is that i is individual by the number of the downstream data flow of Combined Treatment subscriber equipment.

According to an embodiment again of the inventive method, a plurality of downstream data flows that main controlled node is sent to subscriber equipment carry out the step that descending power regulates and specifically comprise: according to each by the thresholding Signal to Interference plus Noise Ratio of the current Signal to Interference plus Noise Ratio of cooperative scheduling subscriber equipment and setting calculate be inversely proportional to by the current Signal to Interference plus Noise Ratio of cooperative scheduling subscriber equipment with each each by the descending power regulatory factor α of cooperative scheduling subscriber equipment; According to $P^{\left(i\right)}=\frac{{\mathrm{\α}}_i}{\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\α}}_k}.$ P ₀It is individual by the descending gross power of cooperative scheduling subscriber equipment to calculate the interior i of main controlled node, wherein, and 1≤i≤n, α _iAnd α _kIt is individual individual by the descending power regulatory factor of cooperative scheduling subscriber equipment with k to be respectively i, P ₀For in the main controlled node by the descending gross power of all subscriber equipmenies of cooperative scheduling, n is by the number of the subscriber equipment of cooperative scheduling in the main controlled node; According to ${\mathrm{PP}}_j=\frac{y_j}{\underset{k=1}{\overset{m}{\mathrm{\Σ}}}{y}_k}.$ P ⁽ⁱ⁾Calculate the descending power of main controlled node to i j road downstream data flow that is sent by the cooperative scheduling subscriber equipment, wherein, 1≤j≤m, y _jAnd y _kBe respectively main controlled node j and k current channel condition information, P to subscriber equipment ⁽ⁱ⁾Individual by the descending gross power of cooperative scheduling subscriber equipment for i in the main controlled node, m is that i is individual by the number of the downstream data flow of cooperative scheduling subscriber equipment.

According to an embodiment again of the inventive method, current channel condition information is channel gain, channel gain interference ratio or Signal to Interference plus Noise Ratio.

To achieve these goals, the present invention also provides the pretreatment system of the downlink transfer in a kind of collaboration communication, comprise: select module, be used for according to combined treatment procedure between the definite employing of the type cooperative node of the subscriber equipment in the overlay area of main controlled node or the cooperative scheduling flow process in the main controlled node; Precoding module between node, be used for when selecting module to determine to adopt combined treatment procedure between cooperative node, obtaining with each cooperative node to pre-coding matrix between the corresponding node of the current channel condition information of subscriber equipment, and utilize pre-coding matrix between node respectively each cooperative node to be carried out internodal precoding to a plurality of downstream data flows that subscriber equipment sends, wherein, comprise main controlled node in each cooperative node; The intranodal precoding module, be used for when selecting module to determine to adopt cooperative scheduling flow process in the main controlled node, obtaining with main controlled node to the corresponding intranodal pre-coding matrix of the current channel condition information of subscriber equipment, and utilize the intranodal pre-coding matrix respectively main controlled node to be carried out the precoding of intranodal to a plurality of downstream data flows that subscriber equipment sends.

An embodiment of system according to the invention, also comprise: power division module between node, be used for when selecting module to determine to adopt combined treatment procedure between cooperative node, calculating between cooperative node each by the descending power regulatory factor of Combined Treatment subscriber equipment, and according to the descending power of each a plurality of downstream data flow that sent to subscriber equipment by the descending power regulatory factor of Combined Treatment subscriber equipment and each cooperative node to each cooperative node of current channel condition information calculations of subscriber equipment between cooperative node; Intranodal power division module, be used for when selecting module to determine to adopt cooperative scheduling flow process in the main controlled node, calculating in the main controlled node each by the descending power regulatory factor of cooperative scheduling subscriber equipment, and according to the descending power of each a plurality of downstream data flow that sent to subscriber equipment by the descending power regulatory factor of cooperative scheduling subscriber equipment and main controlled node to the current channel condition information calculations main controlled node of subscriber equipment in the main controlled node.

Therefore, the present invention is according to the pre-coding matrix of the current channel condition information acquisition correspondence of subscriber equipment, the pre-coding matrix that passes through to be obtained is again eliminated multiple-input and multiple-output (Multi InputMulti Output, MIMO) correlation between channels, make downstream data flow can adapt to descending channel circumstance, thereby improve descending joint transmission user or cooperative scheduling user's performance gain.Do not use the beam shaping technology owing to adopt above-mentioned pre-coding scheme simultaneously, thereby avoided problem of co-channel interference.In addition, this pre-coding scheme also is applicable to the situation of antenna distance less than half-wavelength, thereby is easier to realize than beam shaping technology from project angle.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part.In the accompanying drawings:

Fig. 1 is the schematic flow sheet of first embodiment of the inventive method.

Fig. 2 is the schematic flow sheet of second embodiment of the inventive method.

Fig. 3 is the schematic flow sheet of the 3rd embodiment of the inventive method.

Fig. 4 is about the application schematic diagram of combined treatment procedure between cooperative node among the 4th embodiment of the inventive method.

Fig. 5 is about the application schematic diagram of cooperative scheduling flow process in the main controlled node among the 4th embodiment of the inventive method.

Fig. 6 is the structural representation of first embodiment of system of the present invention.

Fig. 7 is the structural representation of second embodiment of system of the present invention.

Embodiment

With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention wherein is described.Exemplary embodiment of the present invention and explanation thereof are used to explain the present invention, but do not constitute improper qualification of the present invention.

As shown in Figure 1, be the schematic flow sheet of first embodiment of the inventive method.This embodiment specifically comprises the steps:

S101, main controlled node is according to combined treatment procedure between the definite employing of the type cooperative node of the subscriber equipment in the overlay area of main controlled node or the cooperative scheduling flow process in the main controlled node;

S102, in the combined treatment procedure between cooperative node, each cooperative node obtain with each cooperative node to pre-coding matrix between the corresponding node of the current channel condition information of subscriber equipment, and utilize pre-coding matrix between node respectively each cooperative node to be carried out internodal precoding to a plurality of downstream data flows that subscriber equipment sends, wherein, comprise main controlled node in each cooperative node;

S103, in the cooperative scheduling flow process in main controlled node, main controlled node obtain with main controlled node to the corresponding intranodal pre-coding matrix of the current channel condition information of subscriber equipment, and utilize the intranodal pre-coding matrix respectively main controlled node to be carried out the precoding of intranodal to a plurality of downstream data flows that subscriber equipment sends.

Particularly, each cooperative node among the step S102 can be obtained with the step of each cooperative node and be refined as to pre-coding matrix between the corresponding node of the current channel condition information of subscriber equipment:

Each cooperative node is based on pre-coding matrix between node each cooperative node calculating or calculate correspondence respectively from each cooperative node to the current channel condition information of subscriber equipment that subscriber equipment obtains; And/or

Each cooperative node is according to selecting pre-coding matrix between the node corresponding with precoding matrix indicators from the precoding matrix indicators of subscriber equipment from code book, wherein, precoding matrix indicators is to be determined based on each cooperative node to the current channel condition information of subscriber equipment by subscriber equipment.

In addition, also the main controlled node among the step S103 can be obtained with the step of main controlled node and be refined as to the corresponding intranodal pre-coding matrix of the current channel condition information of subscriber equipment:

Main controlled node is based on intranodal pre-coding matrix main controlled node calculating or calculate correspondence respectively from main controlled node to the current channel condition information of subscriber equipment that subscriber equipment obtains; And/or

Main controlled node is according to selecting the intranodal pre-coding matrix corresponding with precoding matrix indicators from the precoding matrix indicators of subscriber equipment from code book, wherein, precoding matrix indicators is to be determined based on main controlled node to the current channel condition information of subscriber equipment by subscriber equipment.

When subscriber equipment is Cell Edge User, can adopt the combined treatment procedure between cooperative node.When subscriber equipment is Cell Center User, can adopt the cooperative scheduling flow process in the main controlled node.The pre-coding matrix that is adopted in above-mentioned two flow processs can be eliminated the correlation of mimo channel, makes downstream data flow can adapt to descending channel circumstance, thereby improves descending joint transmission user or cooperative scheduling user's performance gain.Owing to adopt precoding technique not adopt the beam shaping technology to improve performance gain, also avoided problem of co-channel interference simultaneously.

As shown in Figure 2, be the schematic flow sheet of second embodiment of the inventive method.This embodiment compares with embodiment among Fig. 1 has increased following steps:

S204, in the combined treatment procedure between cooperative node, increase a plurality of downstream data flows that each cooperative node is sent to subscriber equipment and carried out the step that descending power is regulated, comprise: calculate between cooperative node each by the descending power regulatory factor of Combined Treatment subscriber equipment, and according to the descending power of each a plurality of downstream data flow that sent to subscriber equipment by the descending power regulatory factor of Combined Treatment subscriber equipment and each cooperative node to each cooperative node of current channel condition information calculations of subscriber equipment between cooperative node.

Wherein, a plurality of downstream data flows that each cooperative node sends to subscriber equipment can be carried out the step that descending power regulates further is refined as:

According to each by the thresholding Signal to Interference plus Noise Ratio of the current Signal to Interference plus Noise Ratio of Combined Treatment subscriber equipment and setting calculate be inversely proportional to by the current Signal to Interference plus Noise Ratio of Combined Treatment subscriber equipment with each each by the descending power regulatory factor β of Combined Treatment subscriber equipment;

According to $P^{\left(i\right)}=\frac{{\mathrm{\β}}_i}{\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\β}}_k}.$ P ₀I is individual by the descending gross power of Combined Treatment subscriber equipment between the calculating cooperative node, wherein, and 1≤i≤n, β _iAnd β _kIt is individual individual by the descending power regulatory factor of Combined Treatment subscriber equipment with k to be respectively i, P ₀For between cooperative node by the descending gross power of all subscriber equipmenies of Combined Treatment, n is by the number of the subscriber equipment of Combined Treatment between cooperative node;

According to ${\mathrm{PP}}_j=\frac{x_j}{\underset{k=1}{\overset{m}{\mathrm{\Σ}}}{x}_k}.$ P ⁽ⁱ⁾Calculate the descending power of the j road downstream data flow that j cooperative node send by the Combined Treatment subscriber equipment to i, wherein, 1≤j≤m, x _jAnd x _kBe respectively j cooperative node and k cooperative node current channel condition information, P to subscriber equipment ⁽ⁱ⁾Individual by the descending gross power of Combined Treatment subscriber equipment for i between cooperative node, m is that i is individual by the number of the downstream data flow of Combined Treatment subscriber equipment.

S205, in the cooperative scheduling flow process in main controlled node, increase a plurality of downstream data flows that main controlled node is sent to subscriber equipment and carried out the step that descending power is regulated, comprise: calculate in the main controlled node each by the descending power regulatory factor of cooperative scheduling subscriber equipment, and according to the descending power of each a plurality of downstream data flow that sent to subscriber equipment by the descending power regulatory factor of cooperative scheduling subscriber equipment and main controlled node to the current channel condition information calculations main controlled node of subscriber equipment in the main controlled node.

Wherein, also a plurality of downstream data flows that main controlled node sends to subscriber equipment can be carried out the step that descending power regulates further is refined as:

According to each by the thresholding Signal to Interference plus Noise Ratio of the current Signal to Interference plus Noise Ratio of cooperative scheduling subscriber equipment and setting calculate be inversely proportional to by the current Signal to Interference plus Noise Ratio of cooperative scheduling subscriber equipment with each each by the descending power regulatory factor α of cooperative scheduling subscriber equipment;

According to $P^{\left(i\right)}=\frac{{\mathrm{\α}}_i}{\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\α}}_k}.$ P ₀It is individual by the descending gross power of cooperative scheduling subscriber equipment to calculate the interior i of main controlled node, wherein, and 1≤i≤n, α _iAnd α _kIt is individual individual by the descending power regulatory factor of cooperative scheduling subscriber equipment with k to be respectively i, P ₀For in the main controlled node by the descending gross power of all subscriber equipmenies of cooperative scheduling, n is by the number of the subscriber equipment of cooperative scheduling in the main controlled node;

According to ${\mathrm{PP}}_j=\frac{y_j}{\underset{k=1}{\overset{m}{\mathrm{\Σ}}}{y}_k}.$ P ⁽ⁱ⁾Calculate the descending power of main controlled node to i j road downstream data flow that is sent by the cooperative scheduling subscriber equipment, wherein, 1≤j≤m, y _jAnd y _kBe respectively main controlled node j and k current channel condition information, P to subscriber equipment ⁽ⁱ⁾Individual by the descending gross power of cooperative scheduling subscriber equipment for i in the main controlled node, m is that i is individual by the number of the downstream data flow of cooperative scheduling subscriber equipment.

In the above-described embodiments, each cooperative node to the current channel condition information of subscriber equipment can be channel gain, channel gain interference ratio or Signal to Interference plus Noise Ratio.In addition, main controlled node to the current channel condition information of subscriber equipment also can be channel gain, channel gain interference ratio or Signal to Interference plus Noise Ratio.

Embodiment among Fig. 2 distributes by descending power regulatory factor and descending weighted power, make the distribution of descending power reach the poised state of business demand, Cell Center User and edge customer descending power distributional equity have been improved, reduce interfering with each other of inter-cell user equipment, promoted the throughput of community user integral body simultaneously.

As shown in Figure 3, be the schematic flow sheet of the 3rd embodiment of the inventive method.This embodiment may further comprise the steps:

S301, main controlled node are that Cell Center User or Cell Edge User are determined to adopt the combined treatment procedure between cooperative node or adopted cooperative scheduling flow process in the main controlled node according to the subscriber equipment in the main controlled node institute overlay area;

When the combined treatment procedure between definite employing cooperative node, main controlled node at first oneself is measured or the user measures the pilot signal strength of back to its feedback adjacent node, each stronger cooperative node of X2 interface notice pilot signal by core net carries out Combined Treatment to this subscriber equipment then, next, each cooperative node obtains the current channel condition information (this channel condition information is the current channel condition information of each cooperative node to subscriber equipment) of subscriber equipment, and then each road downstream data flow of subscriber equipment is carried out precoding respectively according to these channel condition informations, on descending gross power certain basis between cooperative node, each cooperative node is that subscriber equipment is provided with the descending power regulatory factor according to the current channel conditions and the threshold value of subscriber equipment, and then utilize this its descending power of descending power regulatory factor correction, current channel condition information according to subscriber equipment is weighted power division again, specifically may further comprise the steps:

S302, each cooperative node (comprising main controlled node) obtains subscriber equipment current channel condition information, wherein, can directly obtain the current channel condition information (CSI of subscriber equipment by the symmetry of up-downgoing channel by each cooperative node, Channel State Information), perhaps measure and inform the relevant information of current channel condition information, Signal to Interference plus Noise Ratio SINR and service attribute etc. self of each cooperative node subscriber equipment to the method for each cooperative node feedback by the user;

S303, each cooperative node carries out internodal precoding according to the current channel condition information of the subscriber equipment subscriber equipment feedback or that self calculate for a plurality of downstream data flows that need carry out joint transmission;

S304, each cooperative node is provided with the thresholding Signal to Interference plus Noise Ratio according to the service attribute of subscriber equipment, and is that subscriber equipment is set the descending power regulatory factor in conjunction with the current Signal to Interference plus Noise Ratio of subscriber equipment and relaxation factor;

S305, each cooperative node at first regulate the descending power share of subscriber equipment by the descending power regulatory factor, and then are that subscriber equipment is further adjusted descending power according to channel gain, channel gain interference ratio or Signal to Interference plus Noise Ratio.

Receive the multichannel downstream data flow of each cooperative node transmission at subscriber equipment after, at first respectively the multichannel downstream data flow that each cooperative node sends is decoded, and then merge processing according to the pre-coding matrix of correspondence.Can carry out the merging of data for subscriber equipment exactly and handle, each cooperative node before sending the multichannel downstream data flow, at first need to carry out between each cooperative node synchronously.

When the cooperative scheduling flow process in definite employing main controlled node, main controlled node obtains the current channel condition information (this channel condition information is the current channel condition information of main controlled node to subscriber equipment) of subscriber equipment, and then respectively the multichannel downstream data flow of subscriber equipment is carried out precoding according to this channel condition information, on the descending gross power certain basis in main controlled node, main controlled node is that subscriber equipment is provided with the descending power regulatory factor respectively according to the current channel condition information and the threshold value of each subscriber equipment of intranodal, and then utilize these its descending powers of descending power regulatory factor correction, current channel condition information according to subscriber equipment is weighted power division again, specifically may further comprise the steps:

S306, main controlled node obtains the current channel condition information of subscriber equipment, wherein, can directly obtain the current channel condition information of subscriber equipment by main controlled node by the symmetry of up-downgoing channel, inform the relevant information of current channel condition information, Signal to Interference plus Noise Ratio SINR and service attribute etc. self of main controlled node subscriber equipment after perhaps measuring again to the method for main controlled node feedback by subscriber equipment;

S307, main controlled node carries out the precoding of intranodal according to the current channel condition information of subscriber equipment respectively for the multichannel downstream data flow that need carry out cooperative scheduling;

S308, main controlled node is provided with the thresholding Signal to Interference plus Noise Ratio according to the service attribute of subscriber equipment, and is that subscriber equipment is set the descending power regulatory factor in conjunction with the current Signal to Interference plus Noise Ratio of subscriber equipment and relaxation factor;

S309, main controlled node at first regulate the descending power share by the descending power regulatory factor, further regulate descending power for subscriber equipment according to channel gain, channel gain interference ratio or Signal to Interference plus Noise Ratio again.

Receive the multichannel downstream data flow of main controlled node transmission at subscriber equipment after, at first respectively the multichannel downstream data flow that main controlled node sends is decoded, and then merge processing according to the pre-coding matrix of correspondence.

In step S303, internodal precoding comprises that different nodes based on non-code book (for example, obtain pre-coding matrix by Calculation Method) precoding joint transmission, different node based on the precoding joint transmission of code book (for example, obtaining pre-coding matrix) and different node joint transmission based on non-code book and code book mixing precoding by the method for tabling look-up.In addition, based on the precoding joint transmission of code book comprise based on solid size this precoding joint transmission and based on the precoding joint transmission of many code books.

In step S307, the precoding of intranodal comprise main controlled node based on the precoding joint transmission of non-code book, main controlled node unit based on the precoding joint transmission of code book and main controlled node joint transmission based on non-code book and code book mixing precoding.In addition, based on the precoding joint transmission of code book comprise based on solid size this precoding joint transmission and based on the precoding joint transmission of many code books.

In step S304 and S308, the distribution of descending power is not only relevant with the current channel condition of subscriber equipment, but also relevant with the value of the service attribute of user's request.Wherein, the service attribute of user's request is reflected in the power division by the descending power regulatory factor.The Signal to Interference plus Noise Ratio of the value of descending power regulatory factor and the current environment of subscriber equipment, relevant to the factors such as down channel gain of subscriber equipment based on thresholding Signal to Interference plus Noise Ratio and each cooperative node/main controlled node of service attribute.The descending power regulatory factor can be the Signal to Interference plus Noise Ratio, thresholding Signal to Interference plus Noise Ratio and each the cooperative node/main controlled node that comprise the current environment of the subscriber equipment combining form to any algebraic expression of the down channel gain of subscriber equipment, can also be the expression formula that comprises other performance factors.

Especially, the Signal to Interference plus Noise Ratio that is exemplified as the current environment that comprises subscriber equipment of given descending power regulatory factor, thresholding Signal to Interference plus Noise Ratio and each cooperative node be to the expression formula of the down channel of subscriber equipment gain in the step S304 of this embodiment, and be as follows:

${\mathrm{\β}}_i=\frac{k\·\mathrm{\γ}}{{\mathrm{SINR}}_i}---\left(1\right)$

Wherein, β _iIndividual by the descending power regulatory factor of the subscriber equipment of Combined Treatment for i between cooperative node, k is a relaxation factor, SINR _iIndividual by current total Signal to Interference plus Noise Ratio of the subscriber equipment of Combined Treatment for i between cooperative node, γ is the thresholding Signal to Interference plus Noise Ratio.

Further, the setting of thresholding Signal to Interference plus Noise Ratio γ can synthetically weigh subscriber equipment many aspects performance index and select suitable thresholding Signal to Interference plus Noise Ratio in conjunction with the current business attribute of each subscriber equipment, provide the demand of high-quality business thereby can satisfy for whole subscriber equipmenies.Particularly, thresholding Signal to Interference plus Noise Ratio γ can be provided with based on the service attribute and the service quality (QoS) of subscriber equipment.For the subscriber equipment of session service, be set at I class thresholding Signal to Interference plus Noise Ratio; For the subscriber equipment of streaming media service, be set at II class thresholding Signal to Interference plus Noise Ratio; For the subscriber equipment of interaction service, be set at III class thresholding Signal to Interference plus Noise Ratio; For the subscriber equipment of background business, be set at IV class thresholding Signal to Interference plus Noise Ratio.The value size of relaxation factor k is relevant with modulation system, channel circumstance, decline situation and disturbing factor etc., and generally the value of k is: 0＜k≤1.

Except that above-mentioned (1) formula, this embodiment gives the example of another descending power regulatory factor, and is specific as follows:

${\mathrm{\β}}_i=k\·{\left(\frac{\mathrm{\γ}}{{\mathrm{SINR}}_i}\right)}^n---\left(2\right)$

Wherein, β _iIndividual by the descending power regulatory factor of the subscriber equipment of Combined Treatment for i between cooperative node, k is a relaxation factor, SINR _iγ is the thresholding Signal to Interference plus Noise Ratio by current total Signal to Interference plus Noise Ratio of the subscriber equipment of Combined Treatment for i between cooperative node is individual, and n is any real number.

From above-mentioned example as can be seen, comprise the current channel condition of subscriber equipment and reflect that the expression formula of descending power regulatory factor of thresholding Signal to Interference plus Noise Ratio of the business demand of subscriber equipment can be the form of free-throw line or nonlinear mathematics expression formula, for example, arithmetic, norm, square, content such as index, logarithm.

It is worthy of note, except the example of above-mentioned rule, the descending power regulatory factor of subscriber equipment also is included in the similar change of being done based on above-mentioned rule intension among this embodiment, comprises the expansion deformation of parameter increase and decrease, processing, modification, replacement and other mathematics parameters.In addition, the Signal to Interference plus Noise Ratio among this embodiment in the descending power regulatory factor of subscriber equipment is replaceable to be other performances measurement parameters of other types, for example, and signal interference ratio, signal to noise ratio, blocking rate, throughput and other utility function forms etc.

In step S305, on the basis of the descending power regulatory factor of determining subscriber equipment, the gross power of being distributed between (that is, the cooperative node that is made of each cooperative node bunch) different user devices between cooperative node satisfies:

P ^(l)：…：P ⁽ⁱ⁾：…：P ⁽ⁿ⁾＝β ₁：…：β _i：…：β _n (3)

Wherein, n is by the number of the subscriber equipment of Combined Treatment between cooperative node.

Individual by the subscriber equipment of Combined Treatment for the i between cooperative node, the gross power of distribution is as follows:

$P^{\left(i\right)}=\frac{{\mathrm{\β}}_i}{\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\β}}_k}\·P_0---\left(4\right)$

Wherein, 1≤i≤n, P ⁽ⁱ⁾Be that i is individual by the gross power of the multichannel downstream data flow of the subscriber equipment of Combined Treatment, β _iAnd β _kIt is individual individual by the descending power regulatory factor of the subscriber equipment of Combined Treatment with k to be respectively i, P ₀For between cooperative node by the gross power of the n of a Combined Treatment subscriber equipment.

Each cooperative node is at first by the descending power regulatory factor of subscriber equipment, the power division share of using formula (3) and formula (4) to regulate Cell Center User equipment and Cell Edge User equipment, adopt the power division mode of weighting again according to the down channel situation, for example, according to the current channel condition information of each cooperative node such as channel gain, gain interference ratio or Signal to Interference plus Noise Ratio to subscriber equipment.

The precoding that each cooperative node carries out and for the step of user equipment allocation descending power except said sequence, also can adjust sequencing according to actual conditions.

In step S309, on the basis of the descending power regulatory factor of determining subscriber equipment, the gross power of being distributed between the different user devices in the main controlled node satisfies:

P ^(l)：…：P ⁽ⁱ⁾：…：P ⁽ⁿ⁾＝α _l：…：α _i：…：α _n (5)

Wherein, n is that main controlled node is interior by the number of the subscriber equipment of cooperative scheduling, the descending power regulatory factor α of subscriber equipment _iCan pass through ${\mathrm{\α}}_i=\frac{{\mathrm{SINR}}_{\mathrm{thr}}}{{\mathrm{SINR}}_i}$ Obtain SINR _ThrBe thresholding Signal to Interference plus Noise Ratio, SINR _iFor i in the main controlled node each by current total Signal to Interference plus Noise Ratio of the subscriber equipment of cooperative scheduling.

Individual by the subscriber equipment of cooperative scheduling for the i in the main controlled node, the gross power of distribution is as follows:

$P^{\left(i\right)}=\frac{{\mathrm{\α}}_i}{\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\α}}_k}\·P_0---\left(6\right)$

Wherein, 1≤i≤n, P ⁽ⁱ⁾Be that i is individual by the gross power of the multichannel downstream data flow of the subscriber equipment of cooperative scheduling, α _iAnd α _kIt is individual individual by the descending power regulatory factor of the subscriber equipment of cooperative scheduling with k to be respectively the interior i of main controlled node, P ₀For in the main controlled node by the gross power of the n of a cooperative scheduling subscriber equipment.

Main controlled node is at first regulated the share of the power division of Cell Center User equipment and Cell Edge User equipment by descending power regulatory factor, formula (5) and the formula (6) of subscriber equipment, adopt the power division mode of weighting again according to the down channel situation, for example, according to the current channel condition information of main controlled nodes such as channel gain, gain interference ratio or Signal to Interference plus Noise Ratio to subscriber equipment.

The precoding that main controlled node carries out and for the step of user equipment allocation descending power except that said sequence, also can adjust sequencing according to actual conditions.

Each cooperative node in the present embodiment and main controlled node not only comprise access points such as eNodeB, far-end radio-cell, Base Band Unit, also comprise other provide air interface for the user all access points.

The above-mentioned performance gain that has improved Cell Edge User equipment based on Combined Treatment between the node of precoding.Simultaneously, by the method that adopts descending weighted power to distribute, make the distribution of descending power reach the poised state of business demand, improved the fairness of the power division of Cell Center User equipment and Cell Edge User equipment, help to promote the throughput of community user integral body.

As shown in Figure 4, be about the application schematic diagram of combined treatment procedure between cooperative node among the 4th embodiment of the inventive method.

In this embodiment, suppose that it is that subscriber equipment carries out joint transmission that subscriber equipment in the master control eNodeB unit has been selected totally three IWUs of master control eNodeB unit and other two cooperation eNodeB unit.Following precoding pattern can be selected in the eNodeB unit of respectively cooperating that comprises master control eNodeB unit:

Precoding pattern (one)

At first, subscriber equipment obtains CSI from three different cooperation eNodeB unit (comprising master control eNodeB unit) by means such as uplink demodulation or detecting pilot frequencies, and these three CSI are fed back to three cooperation eNodeB unit respectively.On this basis, three cooperation eNodeB unit are respectively based on these three pre-coding matrixes that CSI is this subscriber devices compute correspondence.After this, these three cooperation eNodeB unit carry out precoding according to the pre-coding matrix of correspondence for 3 road downstream data flows of this subscriber equipment respectively, and distribute special-purpose pilot channel.

Precoding pattern (two)

Subscriber equipment obtains three CSI by the means such as common pilot signal that receive from three cooperation eNodeB unit, and then from code book, select corresponding pre-coding matrix based on these three CSI, simultaneously respectively to three cooperation eNodeB unit feedback precoding matrix indicators (PrecodingMatrix Indicator, PMI).Corresponding pre-coding matrix is selected based on PMI value separately respectively in these three cooperation eNodeB unit from code book behind the PMI that receives the subscriber equipment feedback.After obtaining pre-coding matrix, three cooperation eNodeB unit carry out precoding to the downstream data flow of this subscriber equipment respectively.In order correctly to decode to the data flow that receives, three cooperation eNodeB unit send the pre-coding matrix authorization information to subscriber equipment respectively, subscriber equipment selects corresponding pre-coding matrix to be used for data stream is decoded from code book based on this PMI value after the PMI information that obtains wherein.

Provide a code book example that is used to search two antenna ports of pre-coding matrix below:

Precoding pattern (three)

Each eNodeB unit of cooperating selects different pre-coding schemes that the user is carried out Combined Treatment respectively.At selecting precoding pattern () to carry out the eNodeB unit of joint transmission, the reciprocal process of eNodeB unit and subscriber equipment is similar to the descending joint transmission mode in the precoding pattern ().At selecting precoding pattern (two) to carry out the eNodeB unit of joint transmission, eNodeB unit and user's reciprocal process is similar to the descending Combined Treatment mode in the precoding pattern (two).

After pre-encode operation is finished in each cooperation eNodeB unit, can also carry out power division to the multichannel downstream data flow.

The gross power of supposing respectively to cooperate between the eNodeB unit is P ₀, each is cooperated between the eNodeB unit by the number of the subscriber equipment of Combined Treatment is n, it is P by the descending gross power that subscriber equipment distributed of Combined Treatment that each eNodeB unit of cooperating is i ⁽ⁱ⁾, cooperation eNodeB unit k is h to the down channel gain of subscriber equipment _k, other cooperation suffered interference in eNodeB unit are N relatively _k, current total Signal to Interference plus Noise Ratio of i subscriber equipment is SINR _i, thresholding Signal to Interference plus Noise Ratio γ is SINR _Thr(wherein, the thresholding Signal to Interference plus Noise Ratio can be provided with according to the QoS of customer service demand, and different user can be different), we can define the descending power regulatory factor β of subscriber equipment _iBe SINR _ThrCurrent SINR with subscriber equipment _iRatio, relaxation factor k is 1, then has:

${\mathrm{\β}}_i=\frac{{\mathrm{SINR}}_{\mathrm{thr}}}{{\mathrm{SINR}}_i}---\left(7\right)$

Work as β _i＜1 o'clock, i subscriber equipment was in the center of its master control eNodeB unit.Work as β _i〉=1 o'clock, i subscriber equipment was in the edge of its master control eNodeB unit.Thresholding Signal to Interference plus Noise Ratio SINR _ThrSetting determine according to the current professional differential and QoS of subscriber equipment.Each is cooperated, and the gross power of different user devices satisfies between the eNodeB unit:

P ^(l)：…：P ⁽ⁱ⁾：…：P ⁽ⁿ⁾＝β ₁：…：β _i：…：β _n (8)

Wherein, n cooperates between eNodeB unit by the number of the subscriber equipment of Combined Treatment for each.

For i between each cooperation eNodeB unit by the subscriber equipment of Combined Treatment, for the gross power of its distribution as follows:

$P^{\left(i\right)}=\frac{{\mathrm{\β}}_i}{\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\β}}_k}\·P_0---\left(9\right)$

Wherein, 1≤i≤n, P ⁽ⁱ⁾Be that i is individual by the gross power of the multichannel downstream data flow of the subscriber equipment of Combined Treatment, β _iAnd β _kIt is individual individual by the descending power regulatory factor of the subscriber equipment of Combined Treatment with k to be respectively i, P ₀For cooperating between the eNodeB unit by the gross power of the n of a Combined Treatment subscriber equipment.

Then the eNodeB unit following method based on weighting of employing of respectively cooperating on the basis of the above is the user equipment allocation descending power.

Scheme (one): adopt the channel gain among the CSI to be weighted

As shown in Figure 4, suppose that 3 cooperation eNodeB unit are that i is individual by the subscriber equipment service of Combined Treatment, in conjunction with our design philosophy, the descending power that eNodeB distributes to the unit this subscriber equipment is proportional to the weighting of eNodeB unit to the current channel gain of subscriber equipment.The allocative decision of descending power is as follows:

$\left\{\begin{array}{c}{P}_1+P_2+P_3=P^{\left(i\right)}\\ P_1:P_2:P_3=h_1:h_2:h_3\end{array}\right.---\left(10\right)$

The descending power that arrangement can get 3 cooperation eNodeB unit is respectively:

$P_1=\frac{h_1}{h_1+h_2+h_3}\·P^{\left(i\right)}=\frac{h_1{\mathrm{\β}}_i}{(h_1+h_2+h_3)\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\β}}_k}\·P_0---\left(11\right)$

$P_2=\frac{h_2}{h_1+h_2+h_3}\·P^{\left(i\right)}=\frac{h_2{\mathrm{\β}}_i}{(h_1+h_2+h_3)\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\β}}_k}\·P_0---\left(12\right)$

$P_3=\frac{h_3}{h_1+h_2+h_3}\·P^{\left(i\right)}=\frac{h_3{\mathrm{\β}}_i}{(h_1+h_2+h_3)\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\β}}_k}\·P_0---\left(13\right)$

Wherein, 1≤i≤n, P ₁, P ₂And P ₃It is individual by the descending power of 3 road downstream data flows of the subscriber equipment of Combined Treatment transmission, h to i to be respectively 3 cooperation eNodeB unit ₁, h ₂And h ₃It is individual by the channel gain of the subscriber equipment of Combined Treatment, P to be respectively 3 cooperation eNodeB unit to the i ⁽ⁱ⁾Be that i is individual by the gross power of the multichannel downstream data flow of the subscriber equipment of Combined Treatment, β _iAnd β _kIt is individual individual by the descending power regulatory factor of the subscriber equipment of Combined Treatment with k to be respectively i, P ₀For cooperating between eNodeB by the gross power of the n of a Combined Treatment subscriber equipment.

Scheme (two): adopt the channel gain interference ratio among the CSI to be weighted

As shown in Figure 4, suppose that 3 cooperation eNodeB unit are that i is individual by the subscriber equipment service of Combined Treatment, in conjunction with our design philosophy, the descending power that eNodeB distributes to the unit this subscriber equipment is proportional to the weighting of eNodeB unit to the current channel gain interference ratio of subscriber equipment.The allocative decision of descending power is as follows:

$\left\{\begin{array}{c}{P}_1+P_2+P_3=P^{\left(i\right)}\\ P_1:P_2:P_3=(h_1/N_1):(h_2/N_2):(h_3/N_3)\end{array}\right.---\left(14\right)$

The descending power that arrangement can get 3 cooperation eNodeB unit is respectively:

$P_1=\frac{N_2{N}_3{h}_1{\mathrm{\β}}_i}{(N_2{N}_3{h}_1+N_1{N}_3{h}_2+N_1{N}_2{h}_3)\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\β}}_k}\·P_0---\left(15\right)$

$P_2=\frac{N_1{N}_3{h}_2{\mathrm{\β}}_i}{(N_2{N}_3{h}_1+N_1{N}_3{h}_2+N_1{N}_2{h}_3)\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\β}}_k}\·P_0---\left(16\right)$

$P_3=\frac{N_1{N}_2{h}_3{\mathrm{\β}}_i}{(N_2{N}_3{h}_1+N_1{N}_3{h}_2+N_1{N}_2{h}_3)\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\β}}_k}\·P_0---\left(17\right)$

Wherein, 1≤i≤n, P ₁, P ₂And P ₃It is individual by the descending power of 3 road downstream data flows of the subscriber equipment of Combined Treatment transmission, h to i to be respectively 3 cooperation eNodeB unit ₁/ N ₁, h ₂/ N ₂And h ₃/ N ₃It is individual by the channel gain interference ratio of the subscriber equipment of Combined Treatment, P to be respectively 3 cooperation eNodeB unit to the i ⁽ⁱ⁾Be that i is individual by the gross power of the multichannel downstream data flow of the subscriber equipment of Combined Treatment, β _iAnd β _kIt is individual individual by the descending power regulatory factor of the subscriber equipment of Combined Treatment with k to be respectively i, P ₀For cooperating between eNodeB by the gross power of the n of a Combined Treatment subscriber equipment.

It is pointed out that channel gain or channel gain that the signal to noise ratio that can also utilize among the CSI is replaced in the above-mentioned formula disturb the power division that recently realizes the multichannel downstream data flow.

Subscriber equipment is after the downlink data code stream that receives from each cooperation eNodeB unit, and beginning is carried out demodulation respectively at different precoding patterns, and then merges.

Subscriber equipment is after receiving the downing code flow that the eNodeB unit that adopts precoding pattern () sends, in conjunction with pre-coding matrix and the corresponding dedicated pilot demodulation downstream data flow from identical or different eNodeB unit.

Subscriber equipment is behind the downing code flow and common pilot signal that receive the eNodeB unit transmission of adopting precoding pattern (two), in conjunction with this public guide frequency and pre-coding matrix demodulation downstream data flow.

Subscriber equipment is behind the downing code flow that receives the eNodeB unit transmission of adopting precoding pattern (three), the demodulation flow process of the downing code flow that downing code flow that subscriber equipment sends according to the eNodeB unit that adopts precoding pattern () respectively and the eNodeB unit that adopts precoding pattern (two) send is resolved respectively, merges at last again.

Of particular note, merged the thought of Signal to Interference plus Noise Ratio balance in the given scheme of the foregoing description, gross power to the unique user between each cooperation eNodeB unit is optimized, avoid Cell Edge User because of crossing the very few power division that low channel gain causes so effectively, also can suppress the too high and extra interference brought of channel gain simultaneously.

As shown in Figure 5, be about the application schematic diagram of cooperative scheduling flow process in the main controlled node among the 4th embodiment of the inventive method.

In this embodiment, suppose that subscriber equipment 1 selected 3 road downing code flows in the master control eNodeB unit to carry out the cooperative scheduling of subscriber equipment 1.Master control eNodeB can select the unit following precoding pattern:

Precoding pattern (one)

Subscriber equipment passes through 3 CSIs of means acquisitions such as uplink demodulation or detecting pilot frequency from master control eNodeB unit, and these 3 CSI are fed back to master control eNodeB unit respectively.On this basis, master control eNodeB unit is that subscriber equipment 1 calculates corresponding pre-coding matrix based on these 3 CSI respectively.After this, master control eNodeB unit is that subscriber equipment 1 distributes special-purpose pilot channel, and the data flow after frequency pilot sign and the precoding is sent to subscriber equipment together.After subscriber equipment 1 receives 3 road downstream data flows from master control eNodeB unit, can obtain equivalent channel after the precoding by channel estimating, thereby carry out the demodulation of data easily.

Precoding pattern (two)

Corresponding pre-coding matrix is selected based on this PMI value in master control eNodeB unit from code book after the PMI that receives subscriber equipment 1 feedback.After obtaining pre-coding matrix, master control eNodeB unit carries out precoding processing respectively to 3 road downstream data flows of subscriber equipment 1.

This scheme has improved the performance of subscriber equipment by the precoding gain of down collaboration scheduling, and by the weighted power distribution, has further optimized the descending power distributional equity of subscriber equipment, has reduced the interference between the eNodeB unit.

After pre-encode operation is finished to the multichannel downstream data flow of subscriber equipment 1 in master control eNodeB unit, can also carry out descending power and distribute.

The gross power of supposing master control eNodeB unit is P ₀, the number that participates in the subscriber equipment of cooperative scheduling in the master control eNodeB unit is n, being i is P by the descending gross power of the user equipment allocation of cooperative scheduling ⁽ⁱ⁾, master control eNodeB unit is h to i by the descending gain of the subscriber equipment of cooperative scheduling _i, the suffered interference in other eNodeB unit is N relatively _i, i is SINR by current total Signal to Interference plus Noise Ratio of the subscriber equipment of cooperative scheduling _i, thresholding Signal to Interference plus Noise Ratio γ is SINR _Thr(wherein, the thresholding Signal to Interference plus Noise Ratio can be provided with according to the QoS of customer service demand, and different user can be different), we define the descending power regulatory factor α of subscriber equipment _iBe SINR _ThrCurrent Signal to Interference plus Noise Ratio SINR with subscriber equipment _iRatio, relaxation factor k is 1, then has:

${\mathrm{\α}}_i=\frac{{\mathrm{SINR}}_{\mathrm{thr}}}{{\mathrm{SINR}}_i}---\left(18\right)$

Work as α _i＜1 o'clock, i subscriber equipment was in the center of master control eNodeB unit.Work as α _i〉=1 o'clock, i subscriber equipment was in the edge of master control eNodeB unit.Thresholding Signal to Interference plus Noise Ratio SINR _ThrSetting determine according to the differential and QoS of the current business of subscriber equipment.The gross power of different cooperative scheduling subscriber equipmenies satisfies in the master control eNodeB unit:

P ^(l)：…：P ⁽ⁱ⁾：…：P ⁽ⁿ⁾＝α ₁：…：α _i：…：α _n (19)

Wherein, n is by the number of the subscriber equipment of cooperative scheduling in the master control eNodeB unit.

For i subscriber equipment in the master control eNodeB unit, for the gross power of its distribution as follows:

$P^{\left(i\right)}=\frac{{\mathrm{\α}}_i}{\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\α}}_k}\·P_0---\left(20\right)$

Wherein, 1≤i≤n, P ⁽ⁱ⁾Be that i is individual by the gross power of the multichannel downstream data flow of the subscriber equipment of cooperative scheduling, α _iAnd α _kIt is individual individual by the descending power regulatory factor of the subscriber equipment of cooperative scheduling with k to be respectively i, P ₀For in the master control eNodeB unit by the gross power of the n of a cooperative scheduling subscriber equipment.

If master control eNodeB unit provides 3 road downstream data flows for subscriber equipment 1, in conjunction with our design philosophy, the descending power that master control eNodeB distributes to the unit each subscriber equipment is proportional to the weighting of master control eNodeB unit to the current channel gain of subscriber equipment.The allocative decision of descending power is as follows:

$\left\{\begin{array}{c}{P}_1+P_2+P_3=P^{\left(i\right)}\\ P_1:P_2:P_3=h_1:h_2:h_3\end{array}\right.---\left(21\right)$

It is that the power that 3 road downstream data flows of subscriber equipment 1 are distributed is respectively that arrangement can get master control eNodeB unit:

$P_1=\frac{h_1}{h_1+h_2+h_3}\·P^{\left(i\right)}=\frac{h_1{\mathrm{\α}}_i}{(h_1+h_2+h_3)\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\α}}_k}\·P_0---\left(22\right)$

$P_2=\frac{h_2}{h_1+h_2+h_3}\·P^{\left(i\right)}=\frac{h_2{\mathrm{\α}}_i}{(h_1+h_2+h_3)\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\α}}_k}\·P_0---\left(23\right)$

$P_3=\frac{h_3}{h_1+h_2+h_3}\·P^{\left(i\right)}=\frac{h_3{\mathrm{\α}}_i}{(h_1+h_2+h_3)\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\α}}_k}\·P_0---\left(24\right)$

Wherein, 1≤i≤n, P ₁, P ₂And P ₃It is individual by the descending power of 3 road downstream data flows of the subscriber equipment of cooperative scheduling (being subscriber equipment 1 for this embodiment) transmission, h to i to be respectively master control eNodeB unit ₁, h ₂And h ₃Be respectively master control eNodeB unit to the i by the channel gain of the subscriber equipment of cooperative scheduling, P ⁽ⁱ⁾Be that i is individual by the gross power of the multichannel downstream data flow of the subscriber equipment of cooperative scheduling, α _iAnd α _kIt is individual individual by the descending power regulatory factor of the subscriber equipment of cooperative scheduling with k to be respectively i, P ₀For in the master control eNodeB by the gross power of the n of a cooperative scheduling subscriber equipment.

It is pointed out that the channel gain interference ratio that can also utilize among the CSI or signal to noise ratio replace channel gain in the above-mentioned formula and realize power division to the multichannel downstream data flow.

The user is behind the multichannel downing code flow that receives the transmission of master control eNodeB unit, and beginning is carried out demodulation at different precoding patterns, and then merges.

Subscriber equipment is after receiving the downing code flow that the eNodeB unit that adopts precoding pattern () sends, in conjunction with pre-coding matrix and the corresponding dedicated pilot demodulation downstream data flow from master control eNodeB unit.

Subscriber equipment is behind the downing code flow and common pilot signal that receive the eNodeB unit transmission of adopting precoding pattern (two), in conjunction with this public guide frequency and pre-coding matrix demodulation downstream data flow.

What specify is, merged the thought of Signal to Interference plus Noise Ratio balance in the given scheme of the foregoing description, gross power to the unique user in the master control eNodeB unit is optimized, avoid Cell Edge User equipment because of crossing the very few power division that low channel gain causes so effectively, also can suppress the too high and extra interference brought of channel gain simultaneously.

As shown in Figure 6, be the structural representation of first embodiment of system of the present invention.In this embodiment, comprising: select module 11, be used for according to combined treatment procedure between the definite employing of the type cooperative node of the subscriber equipment in the overlay area of main controlled node or the cooperative scheduling flow process in the main controlled node; Precoding module 12 between node, be used for when selecting module to determine to adopt combined treatment procedure between cooperative node, obtaining with each cooperative node to pre-coding matrix between the corresponding node of the current channel condition information of subscriber equipment, and utilize pre-coding matrix between node respectively each cooperative node to be carried out internodal precoding to a plurality of downstream data flows that subscriber equipment sends, wherein, comprise main controlled node in each cooperative node; Intranodal precoding module 13, be used for when selecting module to determine to adopt cooperative scheduling flow process in the main controlled node, obtaining with main controlled node to the corresponding intranodal pre-coding matrix of the current channel condition information of subscriber equipment, and utilize the intranodal pre-coding matrix respectively main controlled node to be carried out the precoding of intranodal to a plurality of downstream data flows that subscriber equipment sends.

The pre-coding matrix that embodiment among Fig. 6 is adopted by precoding module between node or intranodal precoding module is eliminated the correlation of mimo channel, make downstream data flow can adapt to the variation of down channel environment, thereby improve descending Combined Treatment user or cooperative scheduling user's performance gain.Simultaneously owing to do not adopt the beam shaping technology, thereby avoided problem of co-channel interference.

As shown in Figure 7, be the structural representation of second embodiment of system of the present invention.In order to improve the descending power distributional equity, this embodiment compares with embodiment among Fig. 6 have been increased: power division module 21 between node, be used for when selecting module to determine to adopt combined treatment procedure between cooperative node, calculating between cooperative node each by the descending power regulatory factor of Combined Treatment subscriber equipment, and according to the descending power of each a plurality of downstream data flow that sent to subscriber equipment by the descending power regulatory factor of Combined Treatment subscriber equipment and each cooperative node to each cooperative node of current channel condition information calculations of subscriber equipment between cooperative node; Intranodal power division module 22, be used for when selecting module to determine to adopt cooperative scheduling flow process in the main controlled node, calculating in the main controlled node each by the descending power regulatory factor of cooperative scheduling subscriber equipment, and according to the descending power of each a plurality of downstream data flow that sent to subscriber equipment by the descending power regulatory factor of cooperative scheduling subscriber equipment and main controlled node to the current channel condition information calculations main controlled node of subscriber equipment in the main controlled node.

Embodiment among Fig. 7 can not only bring performance gain for subscriber equipment, and can also regulate the descending power share by the descending power regulatory factor that calculates in power division module between node or the intranodal power division module, guaranteed between subscriber equipment and the fairness of power division between each cooperative node, also improved the resource utilization of whole system simultaneously.

One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.

The entire throughput that pre-coding scheme in the cooperative scheduling in Combined Treatment between cooperative node of the present invention and the main controlled node and descending power allocative decision help to promote community user is improved the performance and the fairness of Cell Edge User equipment.

Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are conspicuous for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment that have various modifications that the present invention's design is suitable for special-purpose.

Claims (10)

1. the downlink transfer preprocess method in the collaboration communication is characterized in that described method comprises:

Main controlled node is according to combined treatment procedure between the definite employing of the type cooperative node of the subscriber equipment in the overlay area of described main controlled node or the cooperative scheduling flow process in the main controlled node;

In the combined treatment procedure between described cooperative node, each cooperative node obtain with described each cooperative node to pre-coding matrix between the corresponding node of the current channel condition information of described subscriber equipment, and utilize pre-coding matrix between described node respectively described each cooperative node to be carried out internodal precoding to a plurality of downstream data flows that described subscriber equipment sends, wherein, comprise described main controlled node in described each cooperative node;

In the cooperative scheduling flow process in described main controlled node, described main controlled node obtains and the current channel condition information corresponding intranodal pre-coding matrix of described main controlled node to described subscriber equipment, and utilizes described intranodal pre-coding matrix respectively described main controlled node to be carried out the precoding of intranodal to a plurality of downstream data flows that described subscriber equipment sends.

2. method according to claim 1 is characterized in that, in the combined treatment procedure between described cooperative node, comprises that also a plurality of downstream data flows that described each cooperative node is sent to described subscriber equipment carry out the step that descending power is regulated, and comprising:

Calculate between cooperative node each by the descending power regulatory factor of Combined Treatment subscriber equipment, and according to the descending power of each a plurality of downstream data flow that sent to described subscriber equipment by the descending power regulatory factor of Combined Treatment subscriber equipment and described each cooperative node to described each cooperative node of current channel condition information calculations of described subscriber equipment between described cooperative node.

3. method according to claim 1 is characterized in that, in the cooperative scheduling flow process in described main controlled node, comprises that also a plurality of downstream data flows that described main controlled node is sent to described subscriber equipment carry out the step that descending power is regulated, and comprising:

Calculate in the described main controlled node each by the descending power regulatory factor of cooperative scheduling subscriber equipment, and according to the descending power of each a plurality of downstream data flow that sent to described subscriber equipment by the descending power regulatory factor of cooperative scheduling subscriber equipment and described main controlled node to the described main controlled node of current channel condition information calculations of described subscriber equipment in the described main controlled node.

4. method according to claim 1, it is characterized in that, in the combined treatment procedure between described cooperative node, described each cooperative node obtain as follows with described each cooperative node to pre-coding matrix between the corresponding node of the current channel condition information of described subscriber equipment:

Described each cooperative node is based on pre-coding matrix between node described each cooperative node calculating or calculate correspondence respectively to the current channel condition information of described subscriber equipment from described each cooperative node that described subscriber equipment obtains; And/or

Described each cooperative node is according to selecting pre-coding matrix between the node corresponding with described precoding matrix indicators from the precoding matrix indicators of described subscriber equipment from code book, wherein, described precoding matrix indicators is to be determined based on described each cooperative node to the current channel condition information of described subscriber equipment by described subscriber equipment.

5. method according to claim 1, it is characterized in that, in the cooperative scheduling flow process in described main controlled node, described main controlled node obtains and the current channel condition information corresponding intranodal pre-coding matrix of described main controlled node to described subscriber equipment as follows:

Described main controlled node is based on intranodal pre-coding matrix described main controlled node calculating or calculate correspondence respectively to the current channel condition information of described subscriber equipment from the described main controlled node that described subscriber equipment obtains; Or

Described main controlled node is according to selecting the intranodal pre-coding matrix corresponding with described precoding matrix indicators from the precoding matrix indicators of described subscriber equipment from code book, wherein, described precoding matrix indicators is to be determined based on described main controlled node to the current channel condition information of described subscriber equipment by described subscriber equipment.

6. method according to claim 2 is characterized in that, the step that described a plurality of downstream data flows that described each cooperative node is sent to described subscriber equipment carry out the descending power adjusting specifically comprises:

According to described each by the thresholding Signal to Interference plus Noise Ratio of the current Signal to Interference plus Noise Ratio of Combined Treatment subscriber equipment and setting calculate with described each by the current Signal to Interference plus Noise Ratio of Combined Treatment subscriber equipment be inversely proportional to described each by the descending power regulatory factor β of Combined Treatment subscriber equipment;

According to $P^{\left(i\right)}=\frac{{\mathrm{\β}}_i}{\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\β}}_k}\·P_0$ Calculate between described cooperative node i by the descending gross power of Combined Treatment subscriber equipment, wherein, 1≤i≤n, β _iAnd β _kIt is individual individual by the descending power regulatory factor of Combined Treatment subscriber equipment with k to be respectively described i, P ₀For between described cooperative node by the descending gross power of all subscriber equipmenies of Combined Treatment, n is by the number of the subscriber equipment of Combined Treatment between described cooperative node;

According to ${\mathrm{PP}}_j=\frac{x_j}{\underset{k=1}{\overset{m}{\mathrm{\Σ}}}{x}_k}\·P^{\left(i\right)}$ Calculate the descending power of the j road downstream data flow that j cooperative node send by the Combined Treatment subscriber equipment to described i, wherein, 1≤j≤m, x _jAnd x _kBe respectively described j cooperative node and k cooperative node current channel condition information, described P to described subscriber equipment ⁽ⁱ⁾Individual by the descending gross power of Combined Treatment subscriber equipment for i between described cooperative node, m is that described i is individual by the number of the downstream data flow of Combined Treatment subscriber equipment.

7. method according to claim 3 is characterized in that, the step that described a plurality of downstream data flows that described main controlled node is sent to described subscriber equipment carry out the descending power adjusting specifically comprises:

According to described each by the thresholding Signal to Interference plus Noise Ratio of the current Signal to Interference plus Noise Ratio of cooperative scheduling subscriber equipment and setting calculate with described each by the current Signal to Interference plus Noise Ratio of cooperative scheduling subscriber equipment be inversely proportional to described each by the descending power regulatory factor α of cooperative scheduling subscriber equipment;

According to $P^{\left(i\right)}=\frac{{\mathrm{\α}}_i}{\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\α}}_k}\·P_0$ It is individual by the descending gross power of cooperative scheduling subscriber equipment to calculate the interior i of described main controlled node, wherein, and 1≤i≤n, α _iAnd α _kIt is individual individual by the descending power regulatory factor of cooperative scheduling subscriber equipment with k to be respectively described i, P ₀For in the described main controlled node by the descending gross power of all subscriber equipmenies of cooperative scheduling, n is by the number of the subscriber equipment of cooperative scheduling in the described main controlled node;

According to ${\mathrm{PP}}_j=\frac{y_j}{\underset{k=1}{\overset{m}{\mathrm{\Σ}}}{y}_k}\·P^{\left(i\right)}$ Calculate the descending power of the j road downstream data flow that described main controlled node sends by the cooperative scheduling subscriber equipment to described i, wherein, 1≤j≤m, y _jAnd y _kBe respectively described main controlled node j and k current channel condition information, described P to described subscriber equipment ⁽ⁱ⁾Individual by the descending gross power of cooperative scheduling subscriber equipment for i in the described main controlled node, m is that described i is individual by the number of the downstream data flow of cooperative scheduling subscriber equipment.

8. according to each described method in the aforementioned claim, it is characterized in that described current channel condition information is channel gain, channel gain interference ratio or Signal to Interference plus Noise Ratio.

9. the downlink transfer pretreatment system in the collaboration communication is characterized in that described system comprises:

Select module, be used for according to combined treatment procedure between the definite employing of the type cooperative node of the subscriber equipment in the overlay area of main controlled node or the cooperative scheduling flow process in the main controlled node;

Precoding module between node, be used for when described selection module determine to adopt combined treatment procedure between described cooperative node, obtaining with each cooperative node to pre-coding matrix between the corresponding node of the current channel condition information of described subscriber equipment, and utilize pre-coding matrix between described node respectively described each cooperative node to be carried out internodal precoding to a plurality of downstream data flows that described subscriber equipment sends, wherein, comprise described main controlled node in described each cooperative node;

The intranodal precoding module, obtain when being used for the cooperative scheduling flow process in described selection module determine to adopt described main controlled node and described main controlled node to the corresponding intranodal pre-coding matrix of current channel condition information of described subscriber equipment, and utilize described intranodal pre-coding matrix respectively described main controlled node to be carried out the precoding of intranodal to a plurality of downstream data flows that described subscriber equipment sends.

10. system according to claim 9 is characterized in that, described system also comprises:

Power division module between node, be used for when described selection module determine to adopt combined treatment procedure between described cooperative node, calculating between cooperative node each by the descending power regulatory factor of Combined Treatment subscriber equipment, and according to the descending power of each a plurality of downstream data flow that sent to described subscriber equipment by the descending power regulatory factor of Combined Treatment subscriber equipment and described each cooperative node to described each cooperative node of current channel condition information calculations of described subscriber equipment between described cooperative node;

Intranodal power division module, calculate in the described main controlled node each when being used for the cooperative scheduling flow process in described selection module determine to adopt described main controlled node by the descending power regulatory factor of cooperative scheduling subscriber equipment, and according to the descending power of each a plurality of downstream data flow that sent to described subscriber equipment by the descending power regulatory factor of cooperative scheduling subscriber equipment and described main controlled node to the described main controlled node of current channel condition information calculations of described subscriber equipment in the described main controlled node.

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