CN105917593B

CN105917593B - Base station, mobile station and its method

Info

Publication number: CN105917593B
Application number: CN201480073522.2A
Authority: CN
Inventors: 朴在铉; 布鲁诺·克勒克斯; 代明波; 大卫·马瑞泽; 刘鹍鹏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2014-12-12
Filing date: 2014-12-12
Publication date: 2019-11-19
Anticipated expiration: 2034-12-12
Also published as: CN105917593A; WO2016090631A1

Abstract

The embodiment of the invention discloses a kind of base station, mobile station and its methods.A kind of transmission method of base station, the base station is equipped with multiple polar transmission points, the described method includes: the transfer point for the first cluster of mobile station in selecting for being first group from the multiple polar transmission point, to maximize the objective function for representing overall performance of network, first group of the mobile station is one of multiple groups of the mobile station divided according to polarization direction and/or path loss；And data are sent to first group of the mobile station by the transfer point of first cluster.The present invention selects suitable transfer point to maximize the objective function for representing overall performance of network, to serve the mobile station with similar polarization direction or path loss.

Description

Base station, mobile station and its method

Technical field

The present invention relates to mobile communication technology field more particularly to base stations, mobile station and its method.

Background technique

DAS (distributing antenna system) is used equipped with (may be a large amount of) the multiple poles for serving multiple MS (mobile station) Change the BS (base station) or eNode B of DA (spaced antenna) port.The port DA is also referred to as transfer point.

However, needing transfer point selection scheme with the increase of antenna amount at BS to select suitable transfer point to take It is engaged in MS.

Summary of the invention

The present embodiments relate to base station, mobile station and its sides that mobile station is served for selecting suitable transfer point Method.

In a first aspect, providing a kind of transmission method of base station, the base station is equipped with multiple polar transmission points, the side The transfer point for the first cluster of mobile station in selecting that it is first group that method, which includes: from the multiple polar transmission point, is represented with maximizing The objective function of overall performance of network, first group of the mobile station are the mobile stations divided according to polarization direction and/or path loss One of multiple groups；And data are sent to first group of the mobile station by the transfer point of first cluster.

In the first possible implementation according to the method for first aspect, the objective function is written as signal to letting out Dew and noise ratio SLNR, the SLNR be channel state information CSIT at long-term transmitter, first group of the polarization direction and The function of short-term CSIT.

In second of possible reality of the method according to first aspect or according to any aforementioned implementation of first aspect In existing mode, the objective function is written as the lower bound of asymptotic SLNR.

In the third possible reality of the method according to first aspect or according to any aforementioned implementation of first aspect In existing mode, it includes: based on described that the transfer point by first cluster, which sends data to first group of the mobile station, The long-term CSIT of all mobile stations in first group carries out the precoding of channel dimensionality reduction to the data；The data are identified Precoding is to distinguish the mobile station in described first group；And send the data after the precoding.

In the 4th kind of possible reality of the method according to first aspect or according to any aforementioned implementation of first aspect In existing mode, it includes: described in selection that the transfer point by first cluster, which sends data to first group of the mobile station, The polarization direction at each transmission point in first cluster；And institute is sent by the transfer point using selected polarization direction State data.

In the 5th kind of possible reality of the method according to first aspect or according to any aforementioned implementation of first aspect In existing mode, the method also includes sending instruction information to first group of the mobile station, to notify the biography of first cluster The type of the transmission mode of defeated point, wherein the type of the transmission mode includes transmitting in single polarization direction and in multiple poles Change and is transmitted on direction.

In the 6th kind of possible reality of the method according to first aspect or according to any aforementioned implementation of first aspect In existing mode, the method also includes: sending from each physical antenna or polarization direction of all transfer points has the period 1 Property the first kind reference signal so that the mobile station in described first group can measure its respective global long term space and Polarization direction CSI, the reference signal of the first kind are non-precoded；It is sent to all mobile stations in described first group The reference signal of Second Type with Secondary periodicity, so that can to measure precoding short-term for the mobile station in described first group The accuracy valuation of CSI and CSIT, the reference signal of the Second Type are to carry out precoding using the specific pre-coding matrix of group 's；And the reference signal with the third type of third periodic is sent to the specific mobile station in described first group, to survey Amount precoding CSI simultaneously demodulates the data of transmission, and the reference signal of the third type is to utilize the specific precoding square of stream Battle array carries out precoding, wherein the period 1 property is longer than the Secondary periodicity and the Secondary periodicity is than the third It is periodically long, or wherein the period 1 property is shorter than the Secondary periodicity and the Secondary periodicity is than the third week Phase property is short.

In the 7th kind of possible reality of the method according to first aspect or according to any aforementioned implementation of first aspect In existing mode, the method also includes: each mobile station in first group of Xiang Suoshu sends group information, to notify described first Group by described first group and carries the ginseng of first group of the Second Type so as to each mobile station in described first group The time/frequency resource for examining signal is associated.

In the 8th kind of possible reality of the method according to first aspect or according to any aforementioned implementation of first aspect In existing mode, the method also includes: the first movement platform in first group of Xiang Suoshu sends distribution information, to move to described first Dynamic platform distributes orthogonal pilot pattern, so that the first movement platform can be sent based on the orthogonal pilot pattern to be had first week The detectable signal of phase property；First group of the angle of arrival is estimated based on the detectable signal；All shiftings in described first group Dynamic platform sends the reference signal with the Second Type of Secondary periodicity so that the mobile station in described first group can measure it is pre- Encode the accuracy valuation of short-term CSI and CSIT, the reference signal of the Second Type be using the specific pre-coding matrix of group into Row precoding；And the reference letter of the third type with third periodic is sent to the specific mobile station in described first group Number, to measure precoding CSI and demodulate to the data of transmission, the reference signal of the third type is specific pre- using flowing Encoder matrix carries out precoding, wherein the period 1 property is longer than the Secondary periodicity and the Secondary periodicity compares institute It is long to state third periodic, or wherein the period 1 property is shorter than the Secondary periodicity and the Secondary periodicity ratio described in Third periodic is short.

In the 9th kind of possible reality of the method according to first aspect or according to any aforementioned implementation of first aspect In existing mode, the method also includes: sending from the selected polarization direction of the transfer point in first cluster has the period 1 The reference signal of the first kind of property, so that the mobile station in described first group can measure its long term space and polarization direction CSI, the reference signal of the first kind are non-precoded；Sending to all mobile stations in described first group has second The reference signal of periodic Second Type so that the mobile station in described first group can measure the short-term CSI of precoding and The reference signal of the accuracy valuation of CSIT, the Second Type carries out precoding using the specific pre-coding matrix of group；With And the reference signal with the third type of third periodic is sent to the specific mobile station in described first group, it is prelisted with measurement Code CSI simultaneously demodulates the data of transmission, and the reference signal of the third type is carried out using the specific pre-coding matrix of stream Precoding, wherein the period 1 property is longer than the Secondary periodicity and the Secondary periodicity is than the third periodic It is long, or wherein the period 1 property is shorter than the Secondary periodicity and the Secondary periodicity is than the third periodic It is short.

Second aspect provides a kind of transmission method of mobile station, and the mobile station is serviced by base station, and the base station is equipped with There are multiple polar transmission points, which comprises receive the transmission of the first cluster selected in the multiple polar transmission point Data after the precoding of point, to maximize the objective function for representing overall performance of network, the mobile station belongs to first group Mobile station, first group of the mobile station are one of multiple groups of the mobile station divided according to polarization direction and/or path loss；And Data after decoding the precoding.

In the first possible way of realization according to the method for second aspect, the objective function is written as signal to letting out Dew and noise ratio SLNR, the SLNR be channel state information CSIT at long-term transmitter, first group of the polarization direction and The function of short-term CSIT.

In second of possible reality of the method according to second aspect or according to any aforementioned way of realization of second aspect In existing form, the objective function is written as the lower bound of asymptotic SLNR.

In the third possible reality of the method according to second aspect or according to any aforementioned way of realization of second aspect In existing mode, the method also includes from the transfer point of first cluster reception instruction information so that the transfer point of first cluster The type of notification transmission mode, wherein the type of the transmission mode includes transmitting in single polarization direction and in multiple polarization It is transmitted on direction.

In the 4th kind of possible reality of the method according to second aspect or according to any aforementioned way of realization of second aspect In existing mode, the method also includes receiving to have period 1 property from each physical antenna or polarization direction of all transfer points The first kind reference signal, the reference signal of the first kind is non-precoded；Utilize the ginseng of the first kind Examine signal measurement overall situation long term space and polarization direction CSI；Receive it is for all mobile stations in described first group, have the The reference signal of the Second Type of two cycles, the reference signal of the Second Type are carried out using the specific pre-coding matrix of group Precoding；Utilize the accuracy valuation of the reference signal measurement short-term CSI and CSIT of precoding of the Second Type；Receive tool There is the reference signal of the third type of third periodic, the reference signal of the third type is to utilize the specific pre-coding matrix of stream Carry out precoding；And precoding CSI is measured using the reference signal of the third type and the data of transmission are solved It adjusts, wherein the period 1 property is longer than the Secondary periodicity and the Secondary periodicity is longer than the third periodic, or Wherein the period 1 property is shorter than the Secondary periodicity and the Secondary periodicity is shorter than the third periodic by person.

In the 5th kind of possible reality of the method according to second aspect or according to any aforementioned way of realization of second aspect In existing mode, the method also includes receiving to notify first group of the group information；And by described first group and described in carrying The time/frequency resource of the reference signal of first group of the Second Type is associated.

In the 6th kind of possible reality of the method according to second aspect or according to any aforementioned way of realization of second aspect In existing mode, the method also includes receiving distribution information from base station, with to the mobile station distribution orthogonal pilot pattern；It is based on The orthogonal pilot pattern sends the detectable signal with period 1 property；It is measured using the reference signal of the first kind complete Office's long term space and polarization direction CSI；Receive it is for all mobile stations in described first group, with Secondary periodicity the The reference signal of the reference signal of two types, the Second Type carries out precoding using the specific pre-coding matrix of group；Benefit With the accuracy valuation of the reference signal measurement short-term CSI and CSIT of precoding of the Second Type；Receiving has the period 3 Property third type reference signal, the reference signal of the third type is that the specific pre-coding matrix of stream is utilized to carry out precoding 's；And measure precoding CSI using the reference signal of third type and the data of transmission are demodulated, wherein described first Periodically longer than the Secondary periodicity and described Secondary periodicity is longer than the third periodic, or wherein described first week Phase property is shorter than the Secondary periodicity and the Secondary periodicity is shorter than the third periodic.

In the 7th kind of possible reality of the method according to second aspect or according to any aforementioned way of realization of second aspect In existing mode, the method also includes the first kind with period 1 property is received from the selected polarization direction of all transfer points Reference signal, the reference signal of the first kind is non-precoded；It is measured using the reference signal of the first kind Global long term space and polarization direction CSI；It receives for all mobile stations in described first group, with Secondary periodicity The reference signal of the reference signal of Second Type, the Second Type carries out precoding using the specific pre-coding matrix of group； Utilize the accuracy valuation of the reference signal measurement short-term CSI and CSIT of precoding of the Second Type；Receiving has third week The reference signal of the third type of phase property, the reference signal of the third type are prelisted using the specific pre-coding matrix of stream Code；And measure and precoding CSI and the data of transmission are demodulated using the reference signal of the third type, wherein institute State that period 1 property is longer than the Secondary periodicity and the Secondary periodicity is longer than the third periodic, or wherein described Period 1 property is shorter than the Secondary periodicity and the Secondary periodicity is shorter than the third periodic.

The third aspect provides a kind of base station, and equipped with multiple polar transmission points, the base station includes: choosing for the base station Select device, for from the multiple polar transmission point be first group the first cluster of mobile station in selecting transfer point, to maximize generation The objective function of table overall performance of network, first group of the mobile station are the movements divided according to polarization direction and/or path loss One of multiple groups of platform；And transmitter, it is sent for the transfer point by first cluster to first group of the mobile station Data.

In the first possible way of realization according to the base station of the third aspect, the objective function is written as signal to letting out Dew and noise ratio SLNR, the SLNR be channel state information CSIT at long-term transmitter, first group of the polarization direction and The function of short-term CSIT.

Second of possible reality in the base station according to the third aspect or according to any aforementioned way of realization of the third aspect In existing mode, the objective function is written as the lower bound of asymptotic SLNR.

The third possible reality in the base station according to the third aspect or according to any aforementioned way of realization of the third aspect In existing mode, the base station further includes central controller, for acquiring the long-term CSIT of all transfer points；First precoder, Including the selector, and be further used for the long-term CSIT based on all mobile stations in described first group to the data into Row channel dimensionality reduction precoding；And second precoder, for being carried out to the data exported from first precoder Identify precoding to distinguish the mobile station in described first group；And the transmitter, for sending from second precoding Data after the precoding of device output.

The 4th kind of possible reality in the base station according to the third aspect or according to any aforementioned way of realization of the third aspect In existing mode, the base station further includes central controller, for acquiring the long-term CSIT of all transfer points；First precoder, Including the selector；Second precoder, for the long-term CSIT based on all mobile stations in described first group to described Data carry out the precoding of channel dimensionality reduction；And third precoder, for the number exported from second precoder According to identification precoding is carried out, to distinguish the mobile station in described first group；And the transmitter, for sending from the third Data after the precoding of precoder output.

The 5th kind of possible reality in the base station according to the third aspect or according to any aforementioned way of realization of the third aspect In existing mode, the selector is also used to select the polarization direction at each transmission point in first cluster；And the hair Machine is penetrated, for sending the data by the transfer point using selected polarization direction.

The 6th kind of possible reality in the base station according to the third aspect or according to any aforementioned way of realization of the third aspect In existing mode, the transmitter is also used to send instruction information to first group of the mobile station, to notify first cluster The type of the transmission mode of transfer point, wherein the type of the transmission mode includes transmitting in single polarization direction and multiple It is transmitted in polarization direction.

The 7th kind of possible reality in the base station according to the third aspect or according to any aforementioned way of realization of the third aspect In existing mode, the transmitter, which is also used to send from each physical antenna or polarization direction of all transfer points, has the period 1 Property the first kind reference signal so that the mobile station in described first group can measure its respective global long term space and Polarization direction CSI, the reference signal of the first kind are non-precoded；It is sent to all mobile stations in described first group The reference signal of Second Type with Secondary periodicity, so that can to measure precoding short-term for the mobile station in described first group The accuracy valuation of CSI and CSIT, the reference signal of the Second Type are to carry out precoding using the specific pre-coding matrix of group 's；And the reference signal with the third type of third periodic is sent to the specific mobile station in described first group, to survey Amount precoding CSI simultaneously demodulates the data of transmission, and the reference signal of the third type is to utilize the specific precoding square of stream Battle array carries out precoding, wherein the period 1 property is longer than the Secondary periodicity and the Secondary periodicity is than the third It is periodically long, or wherein the period 1 property is shorter than the Secondary periodicity and the Secondary periodicity is than the third week Phase property is short.

The 8th kind of possible reality in the base station according to the third aspect or according to any aforementioned way of realization of the third aspect In existing mode, the transmitter is also used to each mobile station in described first group and sends group information, to notify described first Group by described first group and carries the ginseng of first group of the Second Type so as to each mobile station in described first group The time/frequency resource for examining signal is associated.

The 9th kind of possible reality in the base station according to the third aspect or according to any aforementioned way of realization of the third aspect In existing mode, the transmitter is also used to the first movement platform in described first group and sends distribution information, with to described first Mobile station distribution orthogonal pilot pattern, so that the first movement platform can be sent based on the orthogonal pilot pattern has first Periodic detectable signal；The base station further includes estimator, for estimating that described first group arrives based on the detectable signal Up to angle；The transmitter, all mobile stations being also used in described first group send the Second Type with Secondary periodicity Reference signal so that the mobile station in described first group can measure the accuracy valuation of precoding short-term CSI and CSIT, institute The reference signal for stating Second Type carries out precoding using the specific pre-coding matrix of group；And to the spy in described first group Determine mobile station and send the reference signal with the third type of third periodic, to measure precoding CSI and to the data of transmission It is demodulated, the reference signal of the third type carries out precoding using specific pre-coding matrix is flowed, wherein described the One is periodically longer than the Secondary periodicity and the Secondary periodicity is longer than the third periodic, or wherein described first Periodically shorter than the Secondary periodicity and described Secondary periodicity is shorter than the third periodic.

The tenth kind of possible reality in the base station according to the third aspect or according to any aforementioned way of realization of the third aspect In existing mode, the selected polarization direction that the transmitter is also used to the transfer point from first cluster, which is sent, has the period 1 The reference signal of the first kind of property, so that the mobile station in described first group can measure its long term space and polarization direction CSI, the reference signal of the first kind are non-precoded；Sending to all mobile stations in described first group has second The reference signal of periodic Second Type so that the mobile station in described first group can measure the short-term CSI of precoding and The reference signal of the accuracy valuation of CSIT, the Second Type carries out precoding using the specific pre-coding matrix of group；With And the reference signal with the third type of third periodic is sent to the specific mobile station in described first group, it is prelisted with measurement Code CSI simultaneously demodulates the data of transmission, and the reference signal of the third type is carried out using the specific pre-coding matrix of stream Precoding, wherein the period 1 property is longer than the Secondary periodicity and the Secondary periodicity is than the third periodic It is long, or wherein the period 1 property is shorter than the Secondary periodicity and the Secondary periodicity is than the third periodic It is short.

Fourth aspect provides a kind of mobile station, and the mobile station is serviced by base station, and the base station is equipped with multiple polarization Transfer point, the mobile station include: receiver, for receiving the biography of the first cluster selected in the multiple polar transmission point Data after the precoding of defeated point, to maximize the objective function for representing overall performance of network, the mobile station belongs to first group Mobile station, first group of the mobile station is one of multiple groups of the mobile station divided according to polarization direction and/or path loss；With And decoder, for decoding from the data after the received precoding of the receiver.

In the first possible way of realization according to the mobile station of fourth aspect, the objective function is written as signal pair Leakage and noise ratio SLNR, the SLNR are channel state information CSIT at long-term transmitter, first group of the polarization direction With the function of short-term CSIT.

Possible according to fourth aspect or according to second of the mobile station of any aforementioned way of realization of fourth aspect In way of realization, the objective function is written as the lower bound of asymptotic SLNR.

Possible according to fourth aspect or according to the third of the mobile station of any aforementioned way of realization of fourth aspect In implementation, the receiver is also used to receive instruction information from the transfer point of first cluster biography so that first cluster The type of defeated notification transmission mode, wherein the type of the transmission mode includes transmitting in single polarization direction and multiple It is transmitted in polarization direction.

Possible according to fourth aspect or according to the 4th kind of the mobile station of any aforementioned way of realization of fourth aspect In implementation, the receiver, which is also used to receive from each physical antenna or polarization direction of all transfer points, to be had first week The reference signal of the first kind of phase property, the reference signal of the first kind are non-precoded；Utilize the first kind Reference signal measure global long term space and polarization direction CSI；Receive for all mobile stations in described first group, tool There is the reference signal of the Second Type of Secondary periodicity, the reference signal of the Second Type is to utilize the specific pre-coding matrix of group Carry out precoding；Utilize the accuracy valuation of the reference signal measurement short-term CSI and CSIT of precoding of the Second Type；It connects The reference signal with the third type of third periodic is received, the reference signal of the third type is to utilize the specific precoding of stream Matrix carries out precoding；And using the third type reference signal measurement precoding CSI and to the data of transmission into Row demodulation, wherein the period 1 property is longer than the Secondary periodicity and the Secondary periodicity is than the third periodic It is long, or wherein the period 1 property is shorter than the Secondary periodicity and the Secondary periodicity is than the third periodic It is short.

Possible according to fourth aspect or according to the 5th kind of the mobile station of any aforementioned way of realization of fourth aspect In implementation, the receiver, which is also used to receive, notifies first group of the group information, and will described first group with carrying institute The time/frequency resource for stating the reference signal of first group of the Second Type is associated.

Possible according to fourth aspect or according to the 6th kind of the mobile station of any aforementioned way of realization of fourth aspect In implementation, the receiver is also used to receive distribution information from base station, with to the mobile station distribution orthogonal pilot pattern； The mobile station further includes transmitter, for sending the detectable signal with period 1 property based on the orthogonal pilot pattern； And the receiver, be also used to receive it is for all mobile stations in described first group, with Secondary periodicity second The reference signal of the reference signal of type, the Second Type carries out precoding using the specific pre-coding matrix of group；It utilizes The accuracy valuation of the reference signal measurement short-term CSI and CSIT of precoding of the Second Type；Receiving has third periodic Third type reference signal, the reference signal of the third type is that the specific pre-coding matrix of stream is utilized to carry out precoding 's；And measure precoding CSI using the reference signal of third type and the data of transmission are demodulated, wherein described first Periodically longer than the Secondary periodicity and described Secondary periodicity is longer than the third periodic, or wherein described first week Phase property is shorter than the Secondary periodicity and the Secondary periodicity is shorter than the third periodic.

Possible according to fourth aspect or according to the 7th kind of the mobile station of any aforementioned way of realization of fourth aspect In implementation, the receiver, which is also used to receive from the selected polarization direction of all transfer points, has the first of period 1 property The reference signal of type, the reference signal of the first kind are non-precoded；Utilize the reference signal of the first kind Measure global long term space and polarization direction CSI；Receive it is for all mobile stations in described first group, there is second round Property Second Type reference signal, the reference signal of the Second Type is that the specific pre-coding matrix of group is utilized to carry out a precoding 's；Utilize the accuracy valuation of the reference signal measurement short-term CSI and CSIT of precoding of the Second Type；Receiving has third The reference signal of periodic third type, the reference signal of the third type are pre- using specific pre-coding matrix progress is flowed Coding；And measure precoding CSI using the reference signal of the third type and the data of transmission are demodulated, wherein The period 1 property is longer than the Secondary periodicity and the Secondary periodicity is longer than the third periodic, or wherein institute State that period 1 property is shorter than the Secondary periodicity and the Secondary periodicity is shorter than the third periodic.

Therefore, the embodiment of the present invention selects the cluster of transfer point to maximize the objective function for representing overall performance of network, with Just suitable transfer point can serve the mobile station with similar polarization direction or path loss.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described.It should be evident that these attached drawings in being described below are only It is some embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also Other drawings may be obtained according to these drawings without any creative labor.

Fig. 1 shows the example that can apply DAS of the invention.

Fig. 2 shows the methods of one embodiment of the invention.

Fig. 3 shows the method for another embodiment of the present invention.

Fig. 4 shows signaling and feedback/precoding process example.

Fig. 5 shows the example of dual-structured precoding/feedback pilot tone (reference signaling) distribution.

Fig. 6 (a) to (c) shows the example of the port DA selection.

Fig. 7 shows signaling and feedback/precoding process another example.

Fig. 8 shows signaling and feedback/precoding process another example.

Fig. 9 shows another example of dual-structured precoding/feedback pilot tone (reference signaling) distribution.

Figure 10 shows the block diagram of the base station in one embodiment of the invention.

Figure 11 shows the block diagram of the base station in another embodiment of the present invention.

Figure 12 shows the block diagram of the base station in another embodiment of the present invention.

Figure 13 shows the block diagram of the base station in another embodiment of the present invention.

Figure 14 shows the block diagram of the mobile station in one embodiment of the invention.

Figure 15 shows the block diagram of the mobile station in another embodiment of the present invention.

Specific embodiment

Below in conjunction with the attached drawing of these embodiments, technical solution in the embodiment of the present invention is carried out clearly and completely Description.Obviously, described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Based on this A little embodiments, all other embodiment obtained by those of ordinary skill in the art without making creative efforts, It shall fall within the protection scope of the present invention.

The present invention be directed to BS with the multiple poliarizing antenna ports for serving multiple MS (may a large amount of) distribution or The transmission strategy of eNodeB.Fig. 1 shows the example that can apply DAS of the invention.

Specifically, Fig. 1 shows extensive distribution BS days with the horizontal or vertical polarization direction indicated with corner block The example of line.Here, there is single poliarizing antenna with the MS that rectangular block indicates, and cluster as several co-polarization groups.That is, same group The distance between middle MS is far smaller than the distance between port MS and DA, and the MS in given group has identical polarization direction.

Here, the quantity of the port DA is M, and there are single vertical/horizontal polarized antenna elements in each port DA, but this can expand Open up the scene that there is mutiple antennas in each port DA.In this way, under the hypothesis of flat weak channel, the reception signal of g groupIt indicates are as follows:

Wherein,It is the channel matrix from all ports DA to g group, n_gIt is zero-mean complex Gaussian Noise vector.N_gIt is the quantity of MS in g group.For sake of simplicity, assuming(that is,).Kth in g group The channel of a MS is expressed as h_gk=[H_g]_k.The vector x of M in this way × 1 is then linear predictive coding transmitting signal, is indicated are as follows:

Wherein, V_gAnd d_gIt is the Linear precoding matrix and data symbol vector of the MS in g group respectively.After precoding Signal x should meet power constraint E [| | x²||]≤P。

Because the port DA is spatially separated and uncorrelated, the transmitting correlation matrix R of g group_gIt may be expressed as:

R_g=diag { I (χ_g1)(1+(d_g1/d₀)^α)^-1..., I (χ_gM)(1+(d_gM/d₀)^α)^-1} (3)

Wherein,

0≤χ of parameter_gm≤ 1 is the inverse of the XPD (cross polarization discrimination) between m-th of port DA and g group, wherein 1 ≤XPD≤∞.The distance between m-th of port DA and g group are expressed as d_gm, path loss exponential representation is α.Here, d₀It is reference Distance.Here it is possible to assume that the distance of MS in same group is far smaller than the distance between MS and DA (spaced antenna) port.This Outside, the MS in given group has identical polarization direction.That is, MS can be grouped based on geometric distance and polarization direction, then R_gIt can It is broken down into:

Wherein, U_gIt is permutation matrix, such characteristic value is just sorted with the descending series of amplitude, Λ_gIt is with space covariance Matrix R_gNonzero eigenvalue M × Metzler matrix.Therefore,It can be modeled as:

Wherein,Element be have the multiple Gauss of zero-mean and unit variance distribution.It can be obtained at transmitter The non-perfect CSIT (channel state information at transmitter) obtainedIt is modeled as:

Wherein, Z_gElement be have the multiple Gauss of zero-mean and unit variance distribution, τ_g∈ [0,1] indicate g group can The inaccuracy of the CSIT of acquisition.

Fig. 2 shows the transmission method of base station, the base station is equipped with multiple polar transmission points (such as the port DA).

201, the base station is the transfer point of first group of the first cluster of mobile station in selecting from multiple polar transmission point, with most Bigization represents the objective function of overall performance of network, which divided according to polarization direction and/or path loss One of multiple groups of mobile station.

202, the base station sends data to first group of the mobile station by the transfer point of first cluster.

Therefore, the cluster of selection of embodiment of the present invention transfer point, to maximize the objective function for representing overall performance of network, with Just suitable transfer point serves the mobile station with similar polarization direction or path loss.

Relative to traditional associated selection scheme of nearest access point, the present invention considers overall performance of network, so as to improve System performance.

Optionally, as one embodiment, which can be written as SLNR (signal is to leakage and noise ratio).The SLNR It is the function of long-term CSIT, first group of polarization direction and short-term CSIT.The long-term CSIT includes that related large scale is weak and pole Change the information in direction.Therefore, the embodiment of the present invention can consider simultaneously channel estimation errors and long-term in terms of the selection of the port DA CSIT, to improve system performance.

Optionally, as another embodiment, in order to reduce the complexity of selection, which can be written as asymptotic (asymptotic) lower bound of SLNR.

Specifically, the port DA selection (pretreatment also referred to as based on long-term CSIT) is described below and utilizes the selected end DA The implementation of every group of multi-user pre-coding of mouth.

Selection matrix (or being preconditioning matrix) B_gColumn by M × M unit matrix I_MColumn composition.If B_gIt is given, Then the efficient channel of g group isIts corresponding covariance matrix is expressed asIn this way, when rule Whole ZF is applied to g groupEfficient channel after, we are it can be concluded that asymptotic SINR are as follows:

Here,And

Note that asymptotic SINR depends on long-term CSIT, preconditioning matrix and channel inaccuracy, rather than short-term CSIT.I The port DA can be selected in pre-treatment step, can thus maximize total rate of all MS groups.That is:

However, the port DA that each group of asymptotic SINR depends not only on as its selection, additionally depends on the end DA of other groups Mouthful.Therefore, because the variable of coupling, finds and maximize the antenna assembly of total rate and do not allow computationally.Instead, we Introduce asymptotic SLNR are as follows:

(9) preconditioning matrix that the SLNR in is organized independently of other.When using with N_BThe random vector of bit quantifies (RVQ) when, the quantization error of short-term CSIT is about are as follows:

In this way, the port the DA selection algorithm for maximizing asymptotic SLNR is indicated as:

Algorithm 1.Pretreatment: the port the DA selection of asymptotic SLNR is maximized

For g=1:G

1) it initializes With

2) set i=i+1, and find so thatMaximum DA port index i_g, wherein

Wherein, it is obtained by using fixed point iterationWith

If 3)Then set I^g=I^g∪{i_gAndIn addition, It updatesThen, step 2) is gone to.

4) otherwise,

If a)Then set I^g=I^g∪{i_gAndIn addition, updatingThen, step 2) is gone to.

B) otherwise, termination algorithm.

Note that in the step 2.a of algorithm 1) in, in order to calculate asymptotic SLNR, it is necessary to fixed point iteration.Alternatively, low Under SNR state (regime),Lower bound can indicate are as follows:

Under high SNR state,Lower bound can indicate are as follows:

WhereinIt isMaximum eigenvalue.Therefore, by under low SNR state (10) or high SNR state under (11) the step 2.a of algorithm 1 is replaced) inWe can be to avoid fixed point iteration.Note that each group of the port DA selects It can complete parallel independently of each other, because SLNR is not influenced by the port the DA selection that other are organized.

Once the selection of the port DA is completed (that is, determining all groups of preconditioning matrix B_g), according to the efficient channel of g groupRegular ZF pre-coding matrix can be calculated as:

Wherein,Here,It is obtainable channel guess value at BS, α is regularization parameter.Normalization factor ξ_gIt may be expressed as:

Therefore, in the embodiment of the present invention, joint considers polarization direction parameter and path loss and CSIT mass in pretreatment, To maximize SLNR or asymptotic SLNR, this, which is suitable for BS, the case where a large amount of ports DA.

After pretreatment, linear multi-user precoding may be implemented.Specifically, dual-structured (dual structured) is pre- Coding/feedback scheme can be applied to the embodiment of the present invention, can reduce feedback overhead in this way.It, can for the data flow to be transmitted Execute multistage precoding and feedback.For example, in an embodiment of the invention, when the transfer point by the first cluster is to first group When mobile station sends data, the long-term CSIT based on all mobile stations in this first group carries out channel dimensionality reduction to the data and prelists Code carries out identification precoding to the data to distinguish the mobile station in this first group, and sends the data after the precoding to MS.

Optionally, as another embodiment, in addition to selecting transfer point, it is also an option that the polarization side at each transmission point To.In this case, when the transfer point by the first cluster sends data to first group of mobile station, base station can choose first The polarization direction at each transmission point in cluster, and the data are sent by the transfer point using selected polarization direction.

Optionally, as another embodiment, which can send instruction information to first group of the mobile station, with notice The type of the transmission mode of the transfer point of first cluster, wherein the type of the transmission mode includes transmitting in single polarization direction It is transmitted in multiple polarization directions.

Executable layered channel estimation procedure and reference signaling transmission, transmit three types using the periodicity successively decreased Reference signal, wherein MS can independently measure the reference signal of three types, and independently report three measured CSI.

Specifically, as one embodiment, which can send out from each physical antenna or polarization direction of all transfer points The reference signal of the first kind with period 1 property is sent, so that can to measure its respective complete for the mobile station in this first group Office's long term space and polarization direction CSI, the reference signal of the first kind are non-precoded.

Further, which can send the Second Type with Secondary periodicity to all mobile stations in this first group Reference signal, so that the mobile station in this first group can measure the accuracy valuation of precoding short-term CSI and CSIT, this second The reference signal of type carries out precoding using the specific pre-coding matrix of group.

Then the BS can send the ginseng with the third type of third periodic to the specific mobile station in this first group Signal is examined, to measure precoding CSI and demodulate to the data of transmission, the reference signal of the third type is specific using flowing Pre-coding matrix carries out precoding.

The period 1 property is longer than the Secondary periodicity and the Secondary periodicity is longer than the third periodic.Or this first Periodically and Secondary periodicity shorter than the Secondary periodicity is shorter than the third periodic.

In addition, the BS can send group information to each mobile station in this first group, to notify this first group, so as to this Each mobile station in first group by this first group and carry first group of the Second Type reference signal time/frequency Resource is associated.

Specifically, as another embodiment, which can send distribution information to the first movement platform in this first group, with Orthogonal pilot pattern is distributed to the first movement platform, so that the first movement platform can be had based on orthogonal pilot pattern transmission The detectable signal of period 1 property, and first group of the AoA (angle of arrival) is estimated based on the detectable signal.

Further, which can send the third type with third periodic to the specific mobile station in this first group Reference signal, to measure precoding CSI and demodulate to the data of transmission, the reference signal of the third type is special using stream Determine pre-coding matrix and carries out precoding.

Specifically, as another embodiment, when having selected the polarization direction of transfer point, BS can be from first cluster The selected polarization direction of transfer point sends the reference signal with the first kind of period 1 property, so that the shifting in this first group Dynamic platform can measure its long term space and polarization direction CSI, and the reference signal of the first kind is non-precoded.

Fig. 3 shows a kind of sending method of mobile station, which is serviced by base station, and the base station is equipped with multiple polarization Transfer point (such as the port DA).

301, after the precoding of the transfer point for the first cluster that mobile station reception selects in multiple polar transmission point Data, represent the objective function of overall performance of network to maximize, which belongs to first group of mobile station, this first group Mobile station be one of multiple groups of the mobile station divided according to polarization direction and/or path loss.

302, the data after mobile station decoding precoding.

Therefore, the embodiment of the present invention selects the cluster of transfer point to maximize the objective function for representing overall performance of network, with Just suitable transfer point serves the mobile station with similar polarization direction or path loss.

Relative to traditional closest to the associated selection scheme of access point, the present invention considers overall performance of network, to change Kind system performance.

Optionally, as one embodiment, which can be written as SLNR.The SLNR is long-term CSIT, first group The function of polarization direction and short-term CSIT.The long-term CSIT includes the information in relation to large-scale fading and polarization direction.Therefore, should Inventive embodiments can consider channel estimation errors and long-term CSIT simultaneously in terms of the selection of the port DA, to improve system performance.

Optionally, as another embodiment, in order to reduce the complexity of selection, which can be written as asymptotic SLNR's Lower bound.

After pretreatment, linear multi-user precoding may be implemented.Specifically, dual-structured precoding/feedback scheme can be with Applied to the embodiment of the present invention, feedback overhead can be reduced in this way.

Optionally, as another embodiment, the MS can receive instruction information from the transfer point of first cluster so that this The type of the transfer point notification transmission mode of cluster, wherein the type of the transmission mode include in single polarization direction transmission and It is transmitted in multiple polarization directions.

Specifically, as one embodiment, which can connect from each physical antenna or polarization direction of all transfer points The reference signal with the first kind of period 1 property is received, the reference signal of the first kind is non-precoded, and benefit Global long term space and polarization direction CSI are measured with the reference signal of the first kind.

Further, the MS can receive it is for all mobile stations in this first group, with Secondary periodicity second The reference signal of the reference signal of type, the Second Type carries out precoding, and benefit using the specific pre-coding matrix of group With the accuracy valuation of the reference signal measurement short-term CSI and CSIT of precoding of the Second Type.

Further, which can receive the reference signal of the third type with third periodic, the ginseng of the third type It examines signal and carries out precoding using specific pre-coding matrix is flowed, and prelisted using the reference signal measurement of the third type Code CSI simultaneously demodulates the data of transmission.

Optionally, as another embodiment, which, which can receive, notifies first group of the group information, and by this first group with The time/frequency resource for carrying the reference signal of first group of the Second Type is associated.

Optionally, as another embodiment, which can receive distribution information from base station, with orthogonal to the mobile station distribution Pilot frequency design, and the detectable signal with period 1 property is sent based on the orthogonal pilot pattern.

Further, the MS can receive it is for all mobile stations in this first group, with Secondary periodicity second The reference signal of the reference signal of type, the Second Type carries out precoding using the specific pre-coding matrix of group, and utilizes The accuracy valuation of the reference signal measurement short-term CSI and CSIT of precoding of the Second Type.

Further, which can receive the reference signal of the third type with third periodic, the ginseng of the third type It examines signal and carries out precoding using specific pre-coding matrix is flowed, and measure precoding using the reference signal of third type CSI simultaneously demodulates the data of transmission.

Optionally, as another embodiment, which can receive from the selected polarization direction of all transfer points has first The reference signal of the periodic first kind, the reference signal of the first kind is non-precoded, and utilizes the first kind Reference signal measure global long term space and polarization direction CSI.

Further, which can receive the reference signal of the third type with third periodic, the ginseng of the third type It examines signal and carries out precoding using specific pre-coding matrix is flowed, and measure precoding using the reference signal of the third type CSI simultaneously demodulates the data of transmission.

Hereafter it will be applied to layered pre-encoding and channel estimation process of the invention according to some specific examples detailed description, These examples are only used for those skilled in the art and more fully understand the present invention, and should not be taken as limiting the scope of the invention.

When there is dual polarization multiple antennas in each port DA, covariance matrix can be indicated are as follows:

Wherein,It is the local covariance matrix of m-th of port DA of g group.In order to execute pretreatment, (i.e. the port DA is selected Select), each MS must estimate all ports DAAnd it reports to BS.Fig. 4 shows corresponding signaling and feeds back/prelist The example of code process.In the example in fig. 4, MS can be grouped based on geometric distance and polarization direction, and MS should estimate, measure Change and reports all ports DA

401, initialization (such as ranging process) is executed.

402, BS receives long-term CSI (d from MS_gm,χ_gm)。

403, BS sends the reference signal (pilot tone) of the first kind to MS.

The referred to as reference signal of CSI-RS1 can be used in pilot tone, and reference signal CSI-RS1 will be said with reference to Fig. 5 example It is bright.

404, MS is estimated based on CSI-RS1 and quantifies the long-term CSI of all ports DAWith channel estimation errors (or Accuracy) parameter

405, MS is to BS Report ParametersWith

406, it is based on long-term CSIT (including the local covariance matrix at the port DA), it is suitable to serve to distribute the port DA MS group.

407, the wave beam forming at each port DA is calculated then, to obtain preconditioning matrix B_g。

408, BS sends the reference signal CSI-RS2 of Second Type to MS.

Reference signal CSI-RS2 will be illustrated with reference to Fig. 5.

409, MS is based on CSI-RS2 estimation feedback quantization statistical parameter, such as

410, MS is estimated based on CSI-RS2 and is quantified group polarization direction specifically short-term CSIT.

411, the effective group polarization CSI measurement result of MS report, i.e., short-term CSIT.

412, BS utilizes (short-term) effective CSIT to calculate pre-coding matrix.

413, BS carries out precoding to data stream using pre-coding matrix.

414, BS is sent by the reference signal of the third type of pre-coding matrix precoding.

The reference signal of the third type is referred to as DM-RS, and description refers to Fig. 5.

415, BS sends the data flow after precoding to MS.

416, MS is based on the specific CSI of DM-RS estimation stream.

417, the data flow after the specific CSI decoding precoding of the stream of MS estimation.

Therefore, non-perfect CSIT and long-term CSIT can be considered (that is, polarization direction, road in the selection of the port DA jointly Damage), to select the suitable port DA.

To complete the channel acquisition at BS, by the example of design channel collection process as described in Figure 5.Note that in Fig. 5, often The dimension of the CSI-RS1 of group is MM_t×N_g, wherein M_tIt is the antenna amount of each port DA.The dimension of every group of CSI-RS2 is K_g× N, wherein N >=N_g.Note that when MS does not have co-polarization (for example, the MS in same group has horizontal or vertical polarization direction, or Their polarization direction is not exclusively aligned), still can by estimation the port DA selection when SLNR come apply proposed precoding/ Feedback.

In Fig. 4, MS reports the spatial correlation matrix of all ports DA in pre-treatment step, this needs big feedback to open Pin and big computational complexity.

In order to reduce feedback overhead, the aerial array with single polarized antenna elements is considered first.In this way, although each There is mutiple antennas in port, but executes the selection of the port DA, just as each only one single antenna of the port DA.Then, in a group MS be only be attached to the group port reportIn this way, feedback overhead can be reduced, because MS does not need to estimate The local covariance matrix of all of the port.Therefore, pre-treatment step can include: 1) DA port select, and 2) it is based on each port DA (part) spatial correlation linear preconditioning matrix.

Next consider that the port DA has dual polarized antenna (that is, each polarization direction has single antenna unit).It then, is being every Before the port a group selection DA, the transmitting antenna list of each port DA selection or opening and the MS group co-polarization of " geometrically closest " Member.In this way, we can increase effective long-term channel gain between the selected port DA and the group serviced, simultaneously The efficient channel gain between the selected port DA and other groups is reduced, leakage is thus reduced.

Fig. 6 (a) to (c) shows the example of the port DA selection.In Fig. 6 (a) to (c), the cluster-a of the port DA is selected to take It is engaged in selecting the cluster-b of the port DA in the group-a of MS to serve the group-b of MS, selects the cluster-c of the port DA to serve the group-of MS c.Note that in figure (a) to (c), with wherein one group of the DA miniport service of filled black in group-a, group-b and group-c, and not The port DA of filling does not serve any group in group-a, group-b and group-c.

Specifically, Fig. 6 (a) and (b) respectively illustrate the example with the selection of the port DA of single antenna and dual polarized antenna. In Fig. 6 (a), the port DA 601 is close to MS group group-a, but their polarization direction is different, and therefore, effective long-term channel gain is simultaneously Less, because supporting group-a without selecting the port DA 601.

However, in Fig. 6 (b), as described above, because the polarization direction of each DA is selected based on geometry, the end DA Mouth usually has co-polarization direction with neighbouring MS group, this will increase asymptotic SLNR, without will increase feedback overhead.In this way, pre- place Manage step can include: 1) 2) DA port select for polarization direction selection.

Now, it is contemplated that general dual polarization linear array antenna shown in Fig. 6 (c).Find out from two above example, in advance Processing step may include three steps: 1) the polarization direction selection of each port DA, each port DA have identical with neighbouring MS group Polarization direction, 2) selection of the port DA, the local space degree of correlation such as algorithm 1 and 3) based on each port DA it is linear pre- The calculating of processing array (or vector).

Fig. 7 describes corresponding signaling and feedback/precoding process example.In the example of fig. 7, it is selected in the port DA Before, MS estimates feedback quantization statistical parameterMS is only the selected port DA estimationAnd MS is only the selected port DA It calculates, quantify and report local wave beam forming vector.

701, initialization (such as ranging process) is executed.

702, BS receives long-term CSI (d from MS_gm,χ_gm)。

703, the geological information based on MS can determine the polarization direction at each port DA.

704, the port DA is distributed to serve MS group.

705, BS sends the reference signal (also referred to as pilot tone or CSI-RS1) of the first kind to MS.

706, MS is estimated based on CSI-RS1 and quantifies the long-term CSI of the selected port DA

707, MS is calculated and is quantified local wave beam forming vector.

708, MS reports part long-term CSI (the space phase of each port DA and array antenna unit to the associated port DA Pass degree matrix).

709, the wave beam forming at each port DA is calculated then, to obtain preconditioning matrix B_g。

710, BS sends the reference signal CSI-RS2 of Second Type to MS.

711, MS is based on CSI-RS2 estimation feedback quantization statistical parameter, such as

712, MS is estimated based on CSI-RS2 and is quantified group polarization direction specifically short-term CSIT.

713, the effective group polarization CSI measurement of MS report, i.e., short-term CSIT.

714, BS utilizes (short-term) effective CSIT to calculate pre-coding matrix.

715, BS carries out precoding to data stream using pre-coding matrix.

716, BS is sent by the reference signal DM-RS of the third type of pre-coding matrix precoding.

717, BS sends the data flow after precoding to MS.

718, MS is based on the specific CSI of DM-RS estimation stream.

719, the data flow after the specific CSI decoding precoding of the stream of MS estimation.

In the example of fig. 7, in order to complete the channel acquisition at BS, it can use the channel collection process in Fig. 4.But In the case of this, the dimension of each group of CSI-RS1 can be K_gM_t×N_g, wherein usual K_g< < M, and reduce feedback overhead.Note Meaning, MS should estimate feedback quantization statistical parameter before DA port assignment, such as

Note that MS reports the spatial correlation of all ports DA in pre-treatment step to the associated port DA in Fig. 7 Matrix.M at array antenna and each port DA_tWhen a antenna element is associated with completely, channel is come from

Wherein, θ_gmIt is the angle of arrival (AoA) from g group to m-th of port DA.In order to be further reduced the feedback overhead, Such as Fig. 8, a MS in every group sends quadrature detection signal, and the associated port DA signal estimation AoA.

801, initialization (such as ranging process) is executed.

802, BS receives long-term CSI (d from MS_gm,χ_gm)。

803, the geological information based on MS can determine the polarization direction at each port DA.

804, the port DA is distributed to serve MS group.

805, BS distributes orthogonal pilot pattern to every group of a MS.

806, MS sends every group of detectable signal based on the orthogonal pilot pattern of distribution to BS.

807, BS estimates the AoA of the group.

808, the wave beam forming at each port DA is calculated to obtain preconditioning matrix B_g。

809, BS sends the reference signal CSI-RS2 of Second Type to MS.

810, MS is based on CSI-RS2 estimation feedback quantization statistical parameter, such as

811, MS is estimated based on CSI-RS2 and is quantified group polarization direction specifically short-term CSIT.

812, the effective group polarization CSI measurement of MS report, i.e., short-term CSIT.

813, BS utilizes (short-term) effective CSIT to calculate pre-coding matrix.

814, BS carries out precoding to data stream using pre-coding matrix.

815, BS is sent by the reference signal DM-RS of the third type of pre-coding matrix precoding.

816, BS sends the data flow after precoding to MS.

817, MS is based on the specific CSI of DM-RS estimation stream.

818, the data flow after the specific CSI decoding precoding of the stream of MS estimation.

Channel acquisition corresponding with Fig. 8 can be designed as shown in Figure 9.Note that in this case, it may be unnecessary to CSI- RS1。

In addition, because there is its own power amplifier in each port DA, when to calculate regular ZF precoding all for we Such as (12) and when sending the signal after its precoding, the power for distributing to some ports DA can exceed that its power constraint.Therefore, In order to meet the constraint of each antenna power, power can be scaled to

BecauseDepending on the power P after scaling_g, and P_gIt is also the function of α in (14), we can be further anti- Regularization parameter α and P are maximized again_g。

Therefore, in the present invention, precoding can be divided into two steps.In first (pretreatment) step, DA is selected in pre-treatment step To maximize SLNR or asymptotic SLNR, this, which is also suitable for BS, the case where a large amount of ports DA for port.In addition, in pre-treatment step Joint considers polarization direction parameter and path loss and CSIT mass.It is every in order to meet in second step (linear multi-user precoding) Antenna power constrains (PAPC), and the transmission power of each port DA can bi-directional scaling.Here, pre- by adjusting linear multi-user Regularization parameter in coding, we can further improve system performance.The embodiment of the present invention, which can extend to the port DA, to be had The case where mutiple antennas unit.DA is improved in particular, bringing using the double antenna deployment of each port DA of polarization direction selection Port density while the lower effect of lower deployment cost.Finally, it for dual-structured precoding/feedback scheme in DAS, optimizes Channel estimation process and reference signaling.

Figure 10 shows the base station in one embodiment of the invention.The base station 100 equipped with multiple polar transmission points (such as The port DA).As shown in Figure 10, base station 100 includes selector 101 and transmitter 102.Selector 101 can pass through base station 100 Processing function is realized, such as CPU (central processing unit), or is realized by the processing function of the transceiver of base station 100, such as Processing part in transmitting/reception chip.

The transmission for the first cluster of mobile station in selecting that it is first group that selector 101, which is used for from the multiple polar transmission point, Point, to maximize the objective function for representing overall performance of network, which is according to polarization direction and/or path loss One of multiple groups of the mobile station of division.

Transmitter 102 is used to send data to first group of the mobile station by the transfer point of first cluster.

The relevant respective process of the BS being somebody's turn to do in the embodiment based on Fig. 1 to Fig. 9 may be implemented in the component of base station 100, for letter For the sake of clean, details are not described herein again.

Optionally, as one embodiment, it is long to leakage and noise ratio SLNR, the SLNR which, which is written as signal, The function of channel state information CSIT at phase transmitter, first group of the polarization direction and short-term CSIT.

Optionally, as another embodiment, which is written as the lower bound of asymptotic SLNR.

Optionally, as another embodiment, which is also used to select at each transmission point in first cluster Polarization direction.The transmitter 102, for sending the data by the transfer point using selected polarization direction.

Optionally, as another embodiment, which is also used to send instruction information to first group of the mobile station, with Notify the type of the transmission mode of the transfer point of first cluster, wherein the type of the transmission mode includes in single polarization direction It transmits and is transmitted in multiple polarization directions.

Optionally, as another embodiment, which is also used to from each physical antenna of all transfer points or pole Change direction and send the reference signal with the first kind of period 1 property, so that the mobile station in this first group can measure it Respective overall situation long term space and polarization direction CSI, the reference signal of the first kind are non-precoded；To in this first group All mobile stations send have Secondary periodicity Second Type reference signal so that the mobile station in this first group can The accuracy valuation of the short-term CSI and CSIT of precoding is measured, the reference signal of the Second Type is to utilize the specific precoding square of group Battle array carries out precoding；And the reference with the third type of third periodic is sent to the specific mobile station in this first group Signal, to measure precoding CSI and demodulate to the data of transmission, the reference signal of the third type is specific pre- using flowing Encoder matrix carries out precoding.The period 1 property is longer than the Secondary periodicity and the Secondary periodicity is than the third periodic It is long, or wherein the period 1 property is shorter than the Secondary periodicity and the Secondary periodicity is shorter than the third periodic.

Optionally, as another embodiment, which is also used to each mobile station transmission group in this first group Information, to notify this first group, so as to each mobile station in this first group by this first group with carry this first group this The time/frequency resource of the reference signal of two types is associated.

Optionally, as another embodiment, which is also used to the selected polarization of the transfer point from first cluster Direction sends the reference signal with the first kind of period 1 property, so that the mobile station in this first group can measure its length Phase space and polarization direction CSI, the reference signal of the first kind be non-precoded；All mobile stations in this first group The reference signal with the Second Type of Secondary periodicity is sent, so that can to measure precoding short for the mobile station in this first group The accuracy valuation of phase CSI and CSIT, the reference signal of the Second Type are to carry out precoding using the specific pre-coding matrix of group 's；And the reference signal with the third type of third periodic is sent to the specific mobile station in this first group, with measurement Precoding CSI simultaneously demodulates the data of transmission, the reference signal of the third type be using flow specific pre-coding matrix into Row precoding.The period 1 property is longer than the Secondary periodicity and the Secondary periodicity is longer than the third periodic, Huo Zheqi In the period 1 property it is shorter than the Secondary periodicity and the Secondary periodicity is shorter than the third periodic.

Figure 11 shows the block diagram of the base station in another embodiment of the present invention.Base station 110 in Figure 11 is as shown in Figure 10 Base station 100 a kind of implementation.In Figure 11 and Figure 10, the identical part of reference number is no longer described in detail.

As shown in figure 11, base station 110 is in addition to transmitter 102, further include central controller 111, the first precoder 112, Second precoder 113 and third precoder 114.

Central controller 111 is used to acquire the long-term CSIT of all transfer points.Central controller 121 can be by base station 100 Processing function realize, for example, CPU (central processing unit), or realized by the processing function of the transceiver of base station 100, For example, the processing component in transmitting/reception chip.

First precoder 112 includes selector 101, and is further used for based on all mobile stations in this first group Long-term CSIT carries out the precoding of channel dimensionality reduction to the data.

Second precoder 113 be used for data export from first precoder 112 carry out identify precoding with Distinguish the mobile station in this first group.

The transmitter 102, for sending from the data after the precoding that second precoder 113 exports.

Figure 12 shows the block diagram of the base station in another embodiment of the present invention.Base station 120 in Figure 12 is as shown in Figure 10 Base station 100 a kind of implementation.In Figure 12 and Figure 10, the identical part of reference number is no longer described in detail.

As shown in figure 12, base station 120 is in addition to transmitter 102, further include central controller 121, the first precoder 122, Second precoder 123 and third precoder 124.

Central controller 121 is used to acquire the long-term CSIT of all transfer points.Central controller 121 can be by base station 100 Processing function realize, for example, CPU (central processing unit), or realized by the processing function of the transceiver of base station 100, For example, the processing component in transmitting/reception chip.

First precoder 122 includes selector 101.

Second precoder 123 carries out the data for the long-term CSIT based on all mobile stations in this first group Channel dimensionality reduction precoding.

Third precoder 124, for carrying out identification precoding to the data exported from second precoder 123, To distinguish the mobile station in this first group.

The transmitter 102, for sending from the data after the precoding that the third precoder 124 exports.

Figure 13 shows the block diagram of the base station in another embodiment of the present invention.The base station 130 is as shown in Figure 10 in Figure 13 Base station 100 a kind of implementation.In Figure 13 and Figure 10, the identical part of reference number is no longer described in detail.

As shown in figure 13, base station 130 further includes estimator 131 in addition to selector 101 and transmitter 102.The estimator 131 can be realized by the processing function of base station 100, for example, CPU (central processing unit), or by the transceiver of base station 100 Processing function is realized, for example, the processing component in transmitting/reception chip.

Transmitter 102 is also used to the first movement platform in this first group and sends distribution information, with to the first movement platform Orthogonal pilot pattern is distributed, so that the first movement platform can send the spy with period 1 property based on the orthogonal pilot pattern Survey signal.

Estimator 131 is used to estimate first group of the angle of arrival based on the detectable signal.

Transmitter 101 is also used to all mobile stations in this first group and sends the Second Type with Secondary periodicity Reference signal, so that the mobile station in this first group can measure the accuracy valuation of precoding short-term CSI and CSIT, this second The reference signal of type carries out precoding using the specific pre-coding matrix of group；And to the specific mobile station in this first group The reference signal with the third type of third periodic is sent, to measure precoding CSI and be demodulated to the data of transmission, The reference signal of the third type carries out precoding using specific pre-coding matrix is flowed.

The period 1 property is longer than the Secondary periodicity and the Secondary periodicity is longer than the third periodic, or wherein should Period 1 property is shorter than the Secondary periodicity and the Secondary periodicity is shorter than the third periodic.

Mobile station 140 can be serviced by base station, and the base station is equipped with multiple polar transmission points (for example, above-mentioned base station 100,110,120 or 130).As shown in figure 14, mobile station 140 includes receiver 141 and decoder 142.

After the precoding for the transfer point that receiver 141 is used to receive the first cluster selected in multiple polar transmission point Data, represent the objective function of overall performance of network to maximize, which belongs to first group of mobile station, this first group Mobile station be one of multiple groups of the mobile station divided according to polarization direction and/or path loss.

Decoder is for decoding from the data after the received precoding of the receiver 141.

The relevant respective process of the MS being somebody's turn to do in the embodiment based on Fig. 1 to Fig. 9 may be implemented in the component of mobile station 140, is For purpose of brevity, details are not described herein again.

Optionally, as an embodiment, it is long-term to leakage and noise ratio SLNR, the SLNR which, which is written as signal, The function of channel state information CSIT at transmitter, first group of the polarization direction and short-term CSIT.

Optionally, as another embodiment, receiver 141 be also used to from the transfer point of first cluster receive instruction information with Make the type of the transfer point notification transmission mode of first cluster, wherein the type of the transmission mode includes in single polarization direction It transmits and is transmitted in multiple polarization directions.

Optionally, as another embodiment, receiver 141 is also used to from each physical antenna of all transfer points or polarization Direction receives the reference signal with the first kind of period 1 property, and the reference signal of the first kind is non-precoded； Global long term space and polarization direction CSI are measured using the reference signal of the first kind；It receives for the institute in this first group There is mobile station, Second Type with Secondary periodicity reference signal, the reference signal of the Second Type is special using group Determine pre-coding matrix and carries out precoding；Utilize the standard of the reference signal measurement short-term CSI and CSIT of precoding of the Second Type Exactness valuation；The reference signal with the third type of third periodic is received, the reference signal of the third type is to utilize stream Specific pre-coding matrix carries out precoding；And precoding CSI is measured and to transmission using the reference signal of the third type Data demodulated.The period 1 property is longer than the Secondary periodicity and the Secondary periodicity is longer than the third periodic, or Wherein the period 1 property is shorter than the Secondary periodicity and the Secondary periodicity is shorter than the third periodic by person.

Optionally, as another embodiment, receiver 141, which is also used to receive, notifies first group of the group information, and should First group associated with the time/frequency resource of reference signal of first group of the Second Type is carried.

Optionally, as another embodiment, receiver 141, which is also used to receive from the selected polarization direction of all transfer points, to be had There is the reference signal of the first kind of period 1 property, the reference signal of the first kind is non-precoded；Using this first The reference signal of type measures global long term space and polarization direction CSI；Receive it is for all mobile stations in this first group, The reference signal of Second Type with Secondary periodicity, the reference signal of the Second Type are to utilize the specific pre-coding matrix of group Carry out precoding；Utilize the accuracy valuation of the reference signal measurement short-term CSI and CSIT of precoding of the Second Type；It receives The reference signal of third type with third periodic, the reference signal of the third type are to utilize the specific pre-coding matrix of stream Carry out precoding；And precoding CSI is measured using the reference signal of the third type and the data of transmission are demodulated. The period 1 property is longer than the Secondary periodicity and the Secondary periodicity is longer than the third periodic, or the wherein period 1 Property and Secondary periodicity shorter than the Secondary periodicity is shorter than the third periodic.

Figure 15 shows the block diagram of the mobile station in another embodiment of the present invention.Mobile station 150 in Figure 15 is such as Figure 14 Shown in mobile station 140 a kind of implementation.In Figure 15 and Figure 14, the identical part of reference number is no longer described in detail.

As shown in figure 15, mobile station 150 further includes transmitter 151 in addition to receiver 141 and decoder 142.

Receiver 141 is also used to receive distribution information from base station, with to the mobile station distribution orthogonal pilot pattern.

Transmitter 151 is used to send the detectable signal with period 1 property based on the orthogonal pilot pattern；And

Receiver 141 be also used to receive it is for all mobile stations in this first group, with Secondary periodicity second The reference signal of the reference signal of type, the Second Type carries out precoding using the specific pre-coding matrix of group；Utilize this The accuracy valuation of the reference signal measurement short-term CSI and CSIT of precoding of Second Type；Receiving has the of third periodic The reference signal of three types, the reference signal of the third type carry out precoding using specific pre-coding matrix is flowed；And Precoding CSI is measured using the reference signal of third type and the data of transmission are demodulated.

In embodiments of the present invention, MS can be following any one, can be fixed or moves, the example of fixed MS Son may include user equipment, terminal, mobile station, subscriber unit or website etc..The example of mobile MS may include cellular phone, a People's digit aid (PDA), radio modem, wireless communication device, hand-held device, laptop computer, wireless phone or Wireless local loop (WLL) website etc..

It should be noted that the term of " first, second etc. " for using within a context is only used for an entity or operation It is distinguished with another entity or operation, without the actual relationship or sequence being intended to indicate between these entities or operation.In addition, art Language "include", "comprise" or its modification are intended in inclusive mode, rather than in a manner of removing property, therefore wrap Process, method, object or the equipment for including some elements will include not only these elements, also may include being not explicitly listed Other elements, or further comprise the process, method, object or the intrinsic element of equipment.Unless otherwise defined, term " packet Include one ... " defined in element will be not excluded for including other same element in process, method, object or the equipment of the element Presence.

Description according to an embodiment of the present invention, those skilled in the art are clearly understood that the present invention can be combined by software Necessary general hardware implementation, naturally it is also possible to which only by hardware realization, but the former is preferred.Based on the understanding, the present invention Solution itself or the present invention part that the prior art is made contributions can be realized in the form of software products, and it is soft Part product can store in storage medium, such as ROM/RAM, hard disk, compact-disc, comprising enabling to computer installation (a People's computer, server or network equipment etc.) execute some instructions described in embodiment or section Example.

Although describing the present invention by way of preferred embodiment, it should be noted that those skilled in the art can be to implementation Example carries out a variety of modifications or deformation, and these modifications or deformation should be fallen within the scope of protection of the present invention.

Claims

1. a kind of transmission method of base station, the base station is equipped with multiple polar transmission points, which comprises

The transfer point for the first cluster of mobile station in selecting for being first group from the multiple polar transmission point represents network to maximize The objective function of overall performance, first group of the mobile station are the more of the mobile station divided according to polarization direction and/or path loss One of a group, wherein the objective function is written as signal to the lower bound of leakage and noise ratio SLNR or asymptotic SLNR, the SLNR It is the function of channel state information CSIT at long-term transmitter, first group of the polarization direction and short-term CSIT；And

Data are sent to first group of the mobile station by the transfer point of first cluster.

2. according to the method described in claim 1, wherein the transfer point by first cluster is to first group of the shifting Dynamic platform sends data

Long-term CSIT based on all mobile stations in described first group carries out the precoding of channel dimensionality reduction to the data；

Identification precoding is carried out to distinguish the mobile station in described first group to the data for having carried out the channel dimensionality reduction precoding； And

Data after sending the precoding, wherein the data after the precoding are the number for having carried out the identification precoding According to.

3. according to the method described in claim 1, wherein the transfer point by first cluster is to first group of the shifting Dynamic platform sends data

Select the polarization direction at each transmission point in first cluster；And

The data are sent by the transfer point using selected polarization direction.

4. according to the method described in claim 1, further include:

Instruction information is sent to first group of the mobile station, to notify the class of the transmission mode of the transfer point of first cluster Type, wherein the type of the transmission mode includes transmitting in single polarization direction and transmitting in multiple polarization directions.

5. according to the method described in claim 1, further include:

The reference letter of the first kind with period 1 property is sent from each physical antenna or polarization direction of all transfer points Number, so that the mobile station in described first group can measure its respective global long term space and polarization direction CSI, described first The reference signal of type is non-precoded；

The reference signal with the Second Type of Secondary periodicity is sent to all mobile stations in described first group, so that described Mobile station in first group can measure the accuracy valuation of precoding short-term CSI and CSIT, the reference letter of the Second Type It number is that the specific pre-coding matrix of group is utilized to carry out a precoding；And

The reference signal with the third type of third periodic is sent to the specific mobile station in described first group, it is pre- to measure Coding CSI simultaneously demodulates the data of transmission, the reference signal of the third type be using flow specific pre-coding matrix into Row precoding,

Wherein the period 1 property is longer than the Secondary periodicity and the Secondary periodicity is longer than the third periodic, or Wherein the period 1 property is shorter than the Secondary periodicity and the Secondary periodicity is shorter than the third periodic by person.

6. according to the method described in claim 5, further include:

Group information is sent to each mobile station in described first group, to notify described first group, so as in described first group Each mobile station by described first group and carry first group of the Second Type reference signal time/frequency resource It is associated.

7. according to the method described in claim 1, further include:

Distribution information is sent to the first movement platform in described first group, to distribute orthogonal guide frequency figure to the first movement platform Case, so that the first movement platform can send the detectable signal with period 1 property based on the orthogonal pilot pattern；

First group of the angle of arrival is estimated based on the detectable signal；

8. according to the method described in claim 3, further include:

The reference letter of the first kind with period 1 property is sent from the selected polarization direction of the transfer point in first cluster Number, so that the mobile station in described first group can measure its long term space and polarization direction CSI, the reference of the first kind Signal is non-precoded；

9. a kind of transmission method of mobile station, the mobile station are serviced by base station, the base station equipped with multiple polar transmission points, The described method includes:

Data after receiving the precoding of the transfer point of the first cluster selected in the multiple polar transmission point, to maximize The objective function of overall performance of network is represented, the mobile station belongs to first group of mobile station, and first group of the mobile station is According to one of multiple groups of the mobile station that polarization direction and/or path loss divide, wherein the objective function is written as signal to leakage With the lower bound of noise ratio SLNR or asymptotic SLNR, the SLNR is channel state information CSIT at long-term transmitter, described first The polarization direction of group and the function of short-term CSIT；And

Data after decoding the precoding.

10. according to the method described in claim 9, further include:

From the transfer point of first cluster receive instruction information so that the transfer point notification transmission mode of first cluster type, Wherein the type of the transmission mode includes transmitting in single polarization direction and transmitting in multiple polarization directions.

11. according to the method described in claim 9, further include:

The reference letter of the first kind with period 1 property is received from each physical antenna or polarization direction of all transfer points Number, the reference signal of the first kind is non-precoded；

Global long term space and polarization direction CSI are measured using the reference signal of the first kind；

Receive the reference signal of Second Type for all mobile stations in described first group, with Secondary periodicity, institute The reference signal for stating Second Type carries out precoding using the specific pre-coding matrix of group；

Utilize the accuracy valuation of the reference signal measurement short-term CSI and CSIT of precoding of the Second Type；

The reference signal with the third type of third periodic is received, the reference signal of the third type is specific using flowing Pre-coding matrix carries out precoding；And

Precoding CSI is measured using the reference signal of the third type and the data of transmission are demodulated,

12. according to the method for claim 11, further includes:

Reception notifies first group of the group information；And

It is related to first group of the time/frequency resource of reference signal of the Second Type is carried by described first group Connection.

13. according to the method described in claim 9, further include:

Distribution information is received from base station, with to the mobile station distribution orthogonal pilot pattern；

The detectable signal with period 1 property is sent based on the orthogonal pilot pattern；

Precoding CSI is measured using the reference signal of third type and the data of transmission are demodulated,

14. according to the method described in claim 9, further include:

From the selected polarization direction of all transfer points receive have period 1 property the first kind reference signal, described first The reference signal of type is non-precoded；

15. a kind of base station, equipped with multiple polar transmission points, the base station includes: for the base station

Selector, for from the multiple polar transmission point be first group the first cluster of mobile station in selecting transfer point, with most Bigization represents the objective function of overall performance of network, and first group of the mobile station is divided according to polarization direction and/or path loss One of multiple groups of mobile station, wherein the objective function is written as signal under leakage and noise ratio SLNR or asymptotic SLNR Boundary, the SLNR are the letter of channel state information CSIT at long-term transmitter, first group of the polarization direction and short-term CSIT Number；And

Transmitter sends data to first group of the mobile station for the transfer point by first cluster.

16. base station according to claim 15, wherein the base station further includes central controller, for acquiring all transmission The long-term CSIT of point；

First precoder, including the selector, and it is further used for the length based on all mobile stations in described first group Phase CSIT carries out the precoding of channel dimensionality reduction to the data；And

Second precoder, for carrying out identification precoding to the data exported from first precoder to distinguish State the mobile station in first group；And

The transmitter, for sending from the data after the precoding that second precoder exports.

17. base station according to claim 15, wherein the base station further includes central controller, for acquiring all transmission The long-term CSIT of point；

First precoder, including the selector；

Second precoder carries out channel to the data for the long-term CSIT based on all mobile stations in described first group Dimensionality reduction precoding；And

Third precoder, for carrying out identification precoding to the data exported from second precoder, to distinguish Mobile station in described first group；And

The transmitter, for sending from the data after the precoding that the third precoder exports.

18. base station according to claim 15, wherein the selector is also used to select each biography in first cluster Polarization direction at defeated point；And

The transmitter, for sending the data by the transfer point using selected polarization direction.

19. base station according to claim 15, wherein the transmitter is also used to send to first group of the mobile station Information is indicated, to notify the type of the transmission mode of the transfer point of first cluster, wherein the type of the transmission mode includes It transmits in single polarization direction and is transmitted in multiple polarization directions.

20. base station according to claim 15, wherein the transmitter is also used to

21. base station according to claim 20, wherein the transmitter is also used to each movement in described first group Platform send group information, to notify described first group, so as to each mobile station in described first group will described first group with carrying The time/frequency resource of the reference signal of described first group of the Second Type is associated.

22. base station according to claim 15, wherein the transmitter is also used to the first movement in described first group Platform sends distribution information, to distribute orthogonal pilot pattern to the first movement platform, so that the first movement platform can be based on The orthogonal pilot pattern sends the detectable signal with period 1 property；

The base station further includes estimator, for estimating first group of the angle of arrival based on the detectable signal；

The transmitter, all mobile stations being also used in described first group send the Second Type with Secondary periodicity Reference signal, so that the mobile station in described first group can measure the accuracy valuation of precoding short-term CSI and CSIT, it is described The reference signal of Second Type carries out precoding using the specific pre-coding matrix of group；And to specific in described first group Mobile station send have third periodic third type reference signal, with measure precoding CSI and to the data of transmission into Row demodulation, the reference signal of the third type carry out precoding using specific pre-coding matrix is flowed,

23. base station according to claim 18, wherein the transmitter is also used to

24. a kind of mobile station, the mobile station is serviced by base station, and the base station is equipped with multiple polar transmission points, the movement Platform includes:

Receiver, the number after the precoding of the transfer point for receiving the first cluster selected in the multiple polar transmission point According to, the objective function of overall performance of network is represented to maximize, the mobile station belongs to first group of mobile station, and described first group Mobile station be one of multiple groups of the mobile station divided according to polarization direction and/or path loss, wherein the objective function is written as For signal to the lower bound of leakage and noise ratio SLNR or asymptotic SLNR, the SLNR is channel state information at long-term transmitter The function of CSIT, first group of the polarization direction and short-term CSIT；And

Decoder, for decoding from the data after the received precoding of the receiver.

25. mobile station according to claim 24, wherein the receiver is also used to connect from the transfer point of first cluster Receive instruction information so that the transfer point notification transmission mode of first cluster type, wherein the type of the transmission mode includes It transmits in single polarization direction and is transmitted in multiple polarization directions.

26. mobile station according to claim 24, wherein the receiver is also used to

27. mobile station according to claim 26, wherein the receiver, which is also used to receive, notifies first group of the group Information, and by described first group and carry first group of the Second Type reference signal time/frequency resource phase Association.

28. mobile station according to claim 24, wherein the receiver is also used to receive distribution information from base station, with to The mobile station distribution orthogonal pilot pattern；

The mobile station further includes transmitter, for sending based on the orthogonal pilot pattern there is the detection of period 1 property to believe Number；

The receiver, be also used to receive it is for all mobile stations in described first group, with Secondary periodicity second The reference signal of the reference signal of type, the Second Type carries out precoding using the specific pre-coding matrix of group；It utilizes The accuracy valuation of the reference signal measurement short-term CSI and CSIT of precoding of the Second Type；Receiving has third periodic Third type reference signal, the reference signal of the third type is that the specific pre-coding matrix of stream is utilized to carry out precoding 's；And measure precoding CSI using the reference signal of third type and the data of transmission are demodulated,

29. mobile station according to claim 24, wherein the receiver is also used to