CN103004160A - Apparatus, method and computer program product for selecting beam group and subset of beams in communication system - Google Patents

Abstract

An apparatus and method for selecting a beam group and a subset of beams in a communication system are disclosed. The method includes: measuring channel state information (CSI) on a downlink from a base station (920); identifying a selected beam group out of a set of beam groups according to a wideband property of the CSI (930); identifying a selected subset of beams in the selected beam group according to at least one subband (940). Wherein the characteristic of the set of beam groups depends on a transmission rank and the number of beams in the selected subset of beams is equal to the transmission rank. The method further includes: generating encoded feedback information identifying the selected beam group and the selected subset of beams for each subband in a double codebook format (950), transmitting the encoded feedback information to the base station. A computer program product comprising the computer program code which is configured to cause the apparatus to implement above operations is also disclosed.

Description

In communication system, select device, the method and computer program product of wave beam group and beam subset

Related application

The priority that the title that the present invention requires on June 1st, 2010 to submit to SIPO is applied for PCT/CN2010/073411 (attorney docket EIE100124PCT) for the PCT of " Apparatus and Method for Selection of Beam Groups and Subset of Beams in a Communication System ", its full content is incorporated herein by reference.

Technical field

Relate generally to communication system of the present invention, and particularly, relate to for device, the method and system of selecting wave beam group and beam subset in communication system.

Background technology

Long Term Evolution (" LTE ") (also the being called as 3GPP LTE) reference of third generation partner program (" 3GPP ") and 3GPP LTE version 8 and the later on research and development of version thereof, this is usually to be used in the industry describing being intended to identify technology and title ability, ongoing effort that can improve such as the such system of Universal Mobile Telecommunications System (" UMTS ").Mark " LTE-A " is used in reference to further developing of LTE usually in the industry.The target of the plan that this is broad-based comprises the better integration that improves communication efficiency, reduction cost, improvement service, uses new frequency spectrum resource and realization and other open standards.

The universal terrestrial radio access network of the evolution among the 3GPP (" E-UTRAN ") comprises towards user plane (comprising packet data polymerized agreement/radio link control/media access control/physics (" PDCP/RLC/MAC/PHY ") sublayer) and the control plane base station that (comprising radio resource control (" RRC ") sublayer), agreement stopped is provided such as the such Wireless Telecom Equipment of cell phone.Wireless Telecom Equipment or terminal are commonly called subscriber equipment (also being called " UE ").The base station is commonly referred to as the entity of the communication network of NodeB or NB.Particularly, in E-UTRAN, " evolution " base station is called as eNodeB or eNB.About the details of E-UTRAN general frame, referring to the 3GPP technical specification that is incorporated herein by reference (" TS ") 36.300 v8.7.0 (2008-12).For the details of radio resource control and management, referring to the 3GPP TS 25.331 that is incorporated herein by reference v.9.1.0 (2009-12) and 3GPP TS 36.331 v.9.1.0 (2009-12).

Along with becoming by widespread deployment such as the such wireless communication system of cell phone, satellite and microwave telecommunication system and continue to attract the user of the number of sustainable growth, in fixing spectrum allocation may and wired delivering power, transmit increasing data volume, large and communication equipment variable number in the urgent need to adapting to.The data volume that increases is the result that Wireless Telecom Equipment transmits video information and surfing internet and execution ordinary voice communications.The needs that continue in order to solve these, effective use of the cellular transmission that current general interested theme is spatial reuse in 3GPP.Effective use of the transmission of spatial reuse can be supported with limited delivering power level at the higher data rate of the lower transmission of every bandwidth hertz (" Hz "), thereby so that Wireless Telecom Equipment can transmit more substantial data in the short time period, perhaps equally, adapt to the basically operation of while of greater amount Wireless Telecom Equipment.

Require in order to satisfy peaks spectrum efficient (up to 30 bits/Hz), in down link (" DL "), will in 3GPP LTE version 10, obtain standardization to the support of 8 emissions (" Tx ") antenna nearly, and make it possible to utilize nearly 8 space layer to carry out the down link spatial reuse and transmit.Agree now the 8-transmitting down link input more/many outputs (" MIMO ") and the multi-users that strengthen input more/many outputs (" MU-MIMO ") the two as transmitting parts of relevant version 10 jobs with the downlink mimo that strengthens.Such process will make it possible to transmit higher data rate with limited transmitter power level under every bandwidth hertz.

Yet, introduced a lot of challenges with other relevant informations so that the base station can be carried out the process of the spatial reuse transmission in down link effectively so that Wireless Telecom Equipment can send back to the base station channel status.How in a plurality of problems one is that in the degree of freedom and the communication channel dimension that do not have to solve in the situation of channel status information reports the increase that is associated with downlink antenna beam forming (also being called as the emission precoding), this channel status information reports has increased the weight of the burden for the uplink communication channel of Wireless Telecom Equipment.Another problem is to be in the situation that has large azimuth expansion in the radio communication channel at transmitting antenna array, and input/many output (" SU-MIMO ") performances more at the alone family that realization improves.It has been generally acknowledged that under current configuration, the covering of Wireless Telecom Equipment that is used for being positioned at the beam intersects place in antenna beam space may be relatively poor.

In view of deployment and these an open questions such as the sustainable growth of the such communication system of cellular communication system, useful is, adopt improved code book form to come so that Wireless Telecom Equipment can be determined channel status and antenna beam characteristic effectively, and this channel status and antenna beam characteristic are delivered to the base station, and this has been avoided the defective of current communication system.

Summary of the invention

These and other problems are usually solved or are avoided by embodiments of the invention, and usually realize technological merit by embodiments of the invention, embodiments of the invention comprise for device, the method and system of selecting wave beam group and beam subset in communication system.In one embodiment, a kind of device comprises processor and the memory that comprises computer program code.Memory and computer program code are configured to, come so that measurement device about the channel condition information from the down link of base station, and is identified selecteed wave beam group from the set of wave beam group according to the broadband attribute of channel condition information by processor.The characteristic of wave beam group set depends on transmission rank.Memory and computer program code further are configured to, and come so that device is identified selecteed beam subset according at least one subband in selected wave beam group by processor.The number of the wave beam in the described selecteed beam subset equals transmission rank.

In order to understand better following detailed description of the present invention, aforementioned content has been summarized feature of the present invention and technological merit quite widely.The other features and advantages of the present invention of the theme that forms claim of the present invention will be described hereinafter.One of ordinary skill in the art appreciates that disclosed concept and specific embodiment can be easily with acting on modification or being designed for other structures of execution identical purpose of the present invention or the basis of process.Those skilled in the art it should also be appreciated that such equivalent construction does not deviate from the spirit and scope of the present invention as setting forth in the claims.

Description of drawings

For a more complete understanding of the present invention and advantage, come by reference to the accompanying drawings the following detailed description of reference now, in the accompanying drawings:

Fig. 1 and Fig. 2 illustrate the system-level diagram of the embodiment of the communication system that is provided for the application of the principles of the present invention environment, and this communication system comprises base station and Wireless Telecom Equipment;

Fig. 3 and Fig. 4 illustrate the system-level diagram of the embodiment of the communication system that is provided for the application of the principles of the present invention environment, and this communication system comprises wireless communication system;

Fig. 5 illustrates the system-level diagram for the embodiment of the communication unit of the communication system of the application of the principles of the present invention;

Fig. 6 A, Fig. 6 B, Fig. 7 A and Fig. 7 B illustrate the diagrammatic representation that forms the embodiment of wave beam group according to the principle of the invention;

Fig. 8 illustrates the in accordance with the principles of the present invention diagrammatic representation of the embodiment of wave beam group; And

Fig. 9 illustrates the flow chart of the embodiment of the method that communication system is operated according to the principle of the invention.

Embodiment

Below discuss formation and the use of currently preferred embodiments in detail.Yet, will be appreciated that, the invention provides a lot of applicable inventive concept that can in large-scale specific background, realize.The specific embodiment of discussing has only illustrated and has been used for making and using ad hoc fashion of the present invention, and do not limited the scope of the invention.According to aforementioned content, with reference in communication system, be used for to determine channel status and antenna beam characteristic and with channel status and antenna beam characteristic from describing the present invention such as the wireless communication device delivery of subscriber equipment to the exemplary embodiment of the specific background of the device of base station, method and system.Device, method and system is applicable to but it is existing to be not limited to comprise and any communication system (that is, UMTS, LTE and change in future thereof are such as the 4th generation (" 4G ") communication system) of following 3GPP technology.

Forward now Fig. 1 to, illustrate the system-level diagram of the embodiment that is provided for communication system the application of the principles of the present invention environment, that comprise base station 115 and Wireless Telecom Equipment (for example, subscriber equipment) 135,140,145.The PSTN (not shown) is coupled in base station 115.Base station 115 disposes a plurality of antennas, is used for transmitting and receiving signal in a plurality of sectors, and described a plurality of sectors comprise the first sector 120, the second sector 125 and the 3rd sector 130, and each sector is wherein crossed over 120 degree usually.Although Fig. 1 illustrates a Wireless Telecom Equipment (for example, Wireless Telecom Equipment 140) in (for example, the first sector 120) in each sector, sector (for example, the first sector 120) can comprise a plurality of Wireless Telecom Equipments usually.In alternate embodiment, base station 115 can be only by a sector (for example, the first sector 120) form, and a plurality of base station can be built as how input/many outputs (" C-MIMO ") operation etc. transmits according to cooperation (co-operative).

Adjustment forms sector (for example, the first sector 120) with phase place by the radiation signal from antenna for base station is focused on, and every sector (for example, the first sector 120) can adopt discrete antenna.A plurality of sectors 120,125,130 can (for example increase the subscriber station that can communicate simultaneously with base station 115 to the interference that antenna for base station focuses on and the phase place adjustment obtains by reducing, Wireless Telecom Equipment 135,140,145) number, and do not need to increase the bandwidth of utilizing.Although Wireless Telecom Equipment 135,140, the 145th, the part of main communication system, but Wireless Telecom Equipment 135,140,145 and can be that the part of auxiliary communication system is to participate in such as other equipment of machine (not shown), but be not limited to, equipment is to communication or other communication to machine of equipment and machine.

Forward now Fig. 2 to, illustrate the system-level diagram of the embodiment that is provided for communication system the application of the principles of the present invention environment, that comprise base station 210 and Wireless Telecom Equipment (for example, subscriber equipment) 260,270.Communication system comprises by communication path or link 220 (for example, passing through fiber-optic communication path) and is coupled to base station 210 such as the such core telecommunications network of PSTN (" PSTN ") 230.The Wireless Telecom Equipment 260,270 that is in its cellular zone 290 is coupled to respectively in base station 210 by wireless communications path or link 240,250.

In the operation of illustrated communication system, the control that base station 210 is distributed by base station 210 on communication path 240,250 respectively and data resource communication come to communicate with each Wireless Telecom Equipment 260,270 in Fig. 2.Under Frequency Division Duplexing (FDD) (" FDD ") and/or time division duplex (" TDD ") communication pattern, control and data resource communication can comprise frequency and the time slot communication resource.Although Wireless Telecom Equipment 260, the 270th, the part of main communication system, but Wireless Telecom Equipment 260,270 and can be that the part of auxiliary communication system is to participate in such as other equipment of machine (not shown), but be not limited to, equipment is to communication or other communication to machine of equipment and machine.

Forward now Fig. 3 to, illustrate the system-level diagram of the embodiment that is provided for communication system the application of the principles of the present invention environment, that comprise wireless communication system.Wireless communication system can be configured to provide UMTS terrestrial radio access network (" E-UTRAN ") the universal mobile telecommunications service of evolution.Mobile management entity/System Architecture Evolution gateway (" MME/SAE GW ", one of them is with 310 indications) be provided for the E-UTRAN Node B via S1 communication link (some of them with " S1 link " indication) and (be indicated as " eNB ", " Node B of evolution ", also be called as " base station ", one of them with 320 the indication) the control function.Base station 320 communicates via X2 communication link (wherein some are indicated with " X2 link ").Various communication links are optical fiber, microwave or other electric metal communication paths normally, such as coaxial link or its combination.

Base station 320 communicates with Wireless Telecom Equipment such as subscriber equipment (" UE ", wherein some are indicated with 330), and subscriber equipment is user's mobile transceiver of carrying normally.Therefore, the communication link of subscriber equipment 330 is coupled to (with the indication of " Uu " communication link in base station 320, wherein some are with " Uu link " indication) be to adopt such as, the airlink of the such wireless communication signals of OFDM (" OFDM ") signal for example.Although Wireless Telecom Equipment 330 is parts of main communication system, but subscriber equipment 330 and such as other equipment of machine (not shown) can be the part of auxiliary communication system participating in, but the equipment that is not limited to is to communication or other communication to machine of equipment and machine.

Forward now Fig. 4 to, illustrate the system-level diagram of the embodiment that is provided for communication system the application of the principles of the present invention environment, that comprise wireless communication system.Wireless communication system provides the E-UTRAN framework, comprise to such as the such Wireless Telecom Equipment of subscriber equipment 420 and the base station (one of them is indicated with 410) that provides E-UTRAN user plane (packet data polymerized agreement/radio link control/media access control/physics) and control plane (radio resource control) agreement to stop such as other such equipment of machine 425 (for example, electrical equipment, TV, instrument etc.).Base station 410 and X2 interface or communication link (with " X2 " indication) interconnection.Base station 410 also is connected to the evolution block core (" EPC ") that comprises mobile management entity/System Architecture Evolution gateway (" MME/SAE GW ", one of them is indicated with 430) by S1 interface or communication link (with " S1 " indication).The S1 interface is supported in the multiple entity relation between mobile management entity/System Architecture Evolution gateway 430 and the base station 410.For the application of supporting to switch between the public-land mobile device, by supporting activity pattern mobility between eNB via the mobile management entity of S1 interface/System Architecture Evolution gateway 430 reorientations.

Base station 410 can the such function of master control such as provided for radio resources management.For example, various functions can be carried out in base station 410, such as the encryption of Internet Protocol (" IP ") header-compressed and customer traffic, the decoding of customer traffic, radio bearer control, the radio access control, connect mobility control, in up link and down link to the dynamic assignment of the communication resource of subscriber equipment, when subscriber equipment adheres to the selection of Mobility Management Entity, to the route towards the user plane data of user plane entity, scheduling and the transmission of (sending out from the Mobility Management Entity source) beep-page message, scheduling and the transmission of (sending out from Mobility Management Entity or operation and maintenance source) broadcast message, and for the measurement of mobility and scheduling and report configuration.Mobile management entity/System Architecture Evolution gateway 430 can the various functions of master control, such as to distribution, the security control of the beep-page message of base station 410, be used for the U plane packet of paging reason termination, be used for switching, the control of idle condition mobility and System Architecture Evolution Bearer Control to the U plane of the ambulant support of subscriber equipment.The distribution of subscriber equipment 420 and the machine 425 410 reception block of information groups from the base station.

In addition, some in the base station 410 are home base stations 440 (equipment) of coupling, and it is coupled to the equipment such as subscriber equipment 450 and/or machine (not shown) for auxiliary communication system.Auxiliary telecommunication system resources can be directly distributed to subscriber equipment 420 and machine 425 or to home base station 440 in base station 410, to communicate (for example, local communication) in auxiliary communication system.In order to understand better home base station (with " HeNB " indication), referring to the 3GPP TS 32.871 that is incorporated herein by reference v.9.1.0 (2010-03).Although subscriber equipment 420, machine 425 are parts of main communication system, but subscriber equipment 420, machine 425 and home base station 440 (communicating with other subscriber equipmenies 450 and machine (not shown)) can be the part of auxiliary communication system participating in, but the equipment that is not limited to is to communication or other communication to machine of equipment and machine.

Forward now Fig. 5 to, illustrate the system-level diagram for the embodiment of the communication unit 510 of the communication system of the application of the principles of the present invention.Communication unit or equipment 510 can represent but be not limited to base station, Wireless Telecom Equipment (for example, subscriber station, terminal, mobile radio station, subscriber equipment, machine), network control unit, communication node etc.Communication unit 510 comprise at least processor 520, the storage temporarily or the program of more lasting attribute and data storage device 550, antenna 560 and be coupled to antenna 560 and the radio-frequency (RF) transceiver 570 of processor 520 to carry out two-way wireless communication.Communication unit 510 can provide point-to-point and/or the point-to-multipoint delivery service.

The communication unit 510 such such as the base station in the cellular network can be coupled to grid cell, such as the network control unit 580 of Public Switched Telephone Network (" PSTN ").Network control unit 580 can and then be formed by processor, memory and other electronic component (not shown).Network control unit 580 provides usually to the access such as the such communication network of PSTN.Can or be coupled to optical fiber, coaxial, twisted-pair feeder, microwave communication the similar link that suitable link stops the unit access is provided.The self-contained equipment that the communication unit 510 that forms Wireless Telecom Equipment normally will be carried by the end user.

Can utilize the processor 520 in the communication unit 510 that one or more treatment facilities realize to carry out the function that is associated with its operation, include but not limited to the format of the precoding (precoder 521) of antenna gain/phase parameter, the Code And Decode (encoder/decoder 523) that forms each bit of communication information, information and the integral body control (controller 525) of communication unit, comprise the process relevant with the management of the communication resource (explorer 528).The exemplary functions relevant with the management of the communication resource comprises but is not limited to management, toll administration, subscription, safety, charging of tracking, configuration management, end user management, the Wireless Telecom Equipment of hardware installation, service management, performance data analysis, end user and equipment etc.For example, according to memory 550, explorer 528 is configured to distribute (for example advocates peace the auxiliary communication resource, time and frequency communication resource), with to/transmit voice communication and data from communication unit 510, and therefore in the auxiliary communication system of advocating peace, the message that comprises the communication resource is formatd.

The concrete function relevant with the management of the communication resource or all or part of execution of process be can in the equipment that separates with communication unit 510 and/or be coupled, carry out, and such function or the result of process transmitted about this execution to communication unit 510.The processor 520 of communication unit 510 can be any type that is applicable to local applied environment, and as non-limiting example, can comprise all-purpose computer, special-purpose computer, microprocessor, digital signal processor (" DSP "), field programmable gate array (" FPGA "), application-specific integrated circuit (ASIC) (" ASIC ") and one or more based in the processor of polycaryon processor framework.

The transceiver 570 of communication unit 510 is modulated to information on the carrier waveform, to be sent to another communication unit by communication unit 510 via antenna 560.570 pairs of information that receive via antenna 560 of transceiver are carried out demodulation further to be processed by other communication units.Transceiver 570 can be supported the duplex operation of communication unit 510.

As mentioned above, the memory 550 of communication unit 510 can be one or more memories, and has any type that is applicable to local applied environment, and can realize with any suitable volatibility or nonvolatile data storage technology, such as memory devices, magnetic storage device and system, optical memory devices and system, read-only storage and the removable memory of based semiconductor.The program that is stored in the memory 550 can comprise program command or computer program code, when it is carried out by association processor, so that communication unit 510 can be carried out task as described herein.Certainly, memory 550 can be formed for being sent to communication unit 510 or the data buffer of the data that transmit from communication unit 510.The exemplary embodiment of system as described herein, subsystem and module can be at least in part by realizing by the processor of for example Wireless Telecom Equipment and base station or by the computer software that hardware or its combination are carried out.As becoming more obviously, as illustrating here and describing, system, subsystem and module can realize in communication unit 510.

Discussion among the 3GPP concentrates on recently for the design of the code book of 8 base station transmit antennas and associated transmissions precoding, and this is unexistent in new LTE version 10 standards.In RAN1 No.59 meeting, agreed version 8 implicit feedback frameworks are expanded to LTE version 10.This is based on the design of modularization (or many granularities), has made up two feedback components from the independent code book of the different qualities that represents channel condition information.A feedback component is for broadband communication channel attribute (also being called as the broadband attribute) and/or long-term communication channel attribute (also being called as long-term attribute), and another is for frequency selectivity communication channel attribute (also being called as the frequency selectivity attribute) and/or short-term communication channel attribute (also being called as the short-term attribute).The example of long-term attribute is the direction structure of optimum launching beam.For example, the position of subscriber equipment can not change rapidly, and therefore, its azimuth direction may be fixed basically.Therefore, the direction structure that can represent with the long-term attribute that by chance has broadband nature launching beam, when particularly having strong spatial coherence at the transmitting antenna array place, this may be observed under the hypothesis of the antenna element of tight spacing (for example, interval half wavelength) very much.The example of short-term attribute is by quick amplitude and phase fluctuation in the aerial communication path.Can represent this rapid fluctuations with the short-term attribute that usually has frequency selectivity matter (that is, changing according to frequency subband).

This communication channel feedback arrangement also is called as this structure of dicode here.Although LTE version 10 standard criterions of disappearance with have the base station that 8 transmitting antennas dispose in 8 layers of transmission in one relevant, the principle of this structure of dicode still can be generalized to the transmitting antenna of arbitrary number.As described here, for be not limited to LTE version 10 and later in the version should be used for describing support down link SU-/MU-MIMO operation, be used for based on this new code book design and the structure of channel condition information (" CSI ") feedback of dicode.

3GPP LTE downlink mimo operation is in some jobs under the consideration of LTE version 10.To two of the LTE version 8/9 of downlink mimo new improve just considered.An improvement is the optimization of MU-MIMO operation, it is benefited from the specific reference symbol of subscriber equipment (being called as UE-RS, perhaps " dedicated reference symbol " DM-RS " " in the 3GPP tissue) and the new reference symbol (" RS ") of cycle channel condition information reference symbol (" CSI-RS ") that adopt precoding and designs bag.The second improvement is that the down link transfer operation is extended to 8 layers of down link SU-MIMO.

These improve as for the support of following from the subscriber equipment feedback model of the enhancing of the implicit feedback principle of LTE version 8.Information feedback is communicated by letter, is particularly played an important role for MU-MIMO for reliable, noiseless (or essentially no interference) accurately.In addition, because the degree of freedom that wherein increases and communication channel dimension and so that when considering the expansion that operates for 8 emission SU/MU-MIMO, signaling aspect and codebook size are very important.

Similar with LTE version 8, the subscriber equipment Feedback Design of LTE version 10 is based upon on the implicit feedback principle (CQI/precoding matrix indicators/order designator), but has following difference: namely, used dicode Ben Geshi rather than single code book form.Yet single code book feedback still can be considered special circumstances that are set to unit matrix in the code-book entry.The RAN1 No.59 of 3GPP working group is traced back in decision about version 10 designs, is to have described by two matrixes that belong to different code books in the lantern slide exhibition that represents among the 3GPP document R1-101683 of " Way Forward for Rel-10 Feedback Framework " to form the precoder that is used for subband at the title that is incorporated in by reference this wherein.A code book is for broadband communication channel attribute and/or long-term attribute, and therefore matrix is represented as " W here ₁".Another code book is for frequency selectivity and/or short-term attribute, and therefore matrix is represented as " W here ₂".The resulting matrix multiple that can for example be constructed to two matrixes for the precoder of each subband.

In nearest 3GPP RAN1 meeting, proposed to utilize the mode of long-term/short-term attribute and the design of some code books to propose.The design aspect that has comprised some keys in these are proposed: the antenna for base station setting that feedback concept is envisioned for by the array type of cross polarization (" XP ") and uniform linear array (" ULA ") operates, and therefore, must correspondingly design and optimize code book.Can sample to long-term and short-term attribute and correspondingly report (in the identical or different moment) with the identical or different time cycle.When considering relatively-stationary total feedback velocity budget (that is, fixing total bit number in given interval), can attempt finding take long-term attribute and short-term attribute as dropping into the optimum balance of feedback bits between the code book of feature.Final precoder is the output of the computing (for example, matrix multiplication) between long-term precoder and the short-term precoder.

In such product, broadband/long-term pre-encoder matrix W ₁With short-term pre-encoder matrix W ₂Rank can further distinguish this concept.(that is, channel matrix " H " is taken advantage of by the right side and is H*W if broadband/long-term attribute is processed after communication channel ₁), then can regard as and handle the main antenna wave beam towards the subscriber equipment signal space, and further fine setting (refinement) can strengthen common phase position (transmission rank-1) or orthogonality (transmission rank＞1) between wave beam/precoder in the subband rank.This can be considered W ₁* W ₂Matrix multiplication operation.On the other hand, can be for matrix W ₁Create larger beam space, it can pass through the premultiplication matrix W ₂Finely tuned.Final pre-encoder matrix W is W ₂* W ₁The output of matrix multiplication.Can prove, these the two kinds modes that form the product of two code books almost are identical.Main difference is how to define matrix W ₂And W ₁Wave beam and fine setting.Denominator (denominator) is to use (over-sampling) discrete Fourier transform (" DFT ") vector or matrix to matrix W ₁Make up.

From the angle of complexity, at the selection matrix W of the subscriber equipment place of communication channel ₂And W ₁Method also be important, and this may affect the performance of scheme itself.For example, in the broadband/long-term and short-term precoder (matrix W ₂And W ₁) all possible combination in the hypothesis of exhaustive search under, a feedback proposes and can carry out best, and deteriorated under actual and not too complicated precoder is selected.When considering to reach 8 space layer (or stream), main for lower transmission rank, i.e. transmission rank 1-2 and also may be for transmission rank 3-4, this concept of dicode is attracting, (for example, size multiply by the matrix W of R for Nt and higher transmission rank may only depend on single feedback component ₂, wherein Nt and R are respectively number and the transmission rank of the transmitting antenna at place, base station) operate, (for example, size multiply by the matrix W of Nt for Nt and other components are set to unit matrix in theory ₁=I).

Each point as previously discussed, this concept of dicode can be lowered to wave beam and the beam selection/combination restriction as vector or the precoder of the part of two code books.Because matrix W ₁Structure can adopt the discrete Fourier transform matrix/vector of over-sampling, this design is based upon on some form of known wave beam grid concept effectively, wherein, subscriber equipment selects to provide a wave beam (row of discrete Fourier transform matrix) of optimum transmission performance effectively.

Version 10 feedback concepts should be supported SU-MIMO and MU-MIMO, wherein, for the not too relevant situation with higher communication channel azimuth (angle) expansion, SU-MIMO is typical and most of performance gains is provided, and for the situation with height correlation of expanding at little azimuth, MU-MIMO is typical and most of performance gains is provided.In the situation of the expansion of higher azimuth and SU-MIMO operation, as in the conventional wave beam grid, only select a wave beam (the perhaps a plurality of wave beams in the situation of transmission rank＞1) usually to be not enough to the communication performance that reaches good for whole frequency band, because carry out in this case preferably knownly in other frequency selectivity precoding of sub-band levels and beam selection.On the other hand, for the expansion of low-down azimuth and MU-MIMO operation, known wave beam grid is carried out finely, because in this case broadband and frequency selectivity precoding realize very near identical performance, and the broadband precoding is owing to much lower associated channel status information feedback expense and more attractive.As described here, traditional wave beam grid concept is modified, so that still support well low azimuth expansion situation, and in the situation with the expansion of high azimuth, improve the performance of SU-/MU-MIMO operation.

Introduced main codebook structure in 10-14 day in May, 2010 in the RAN1 in the Canadian Montreal No.61 session.Yet, part concept even more outmoded.Be " Refinements of Feedback and Codebook Design " (Montreal at title, Canada, in May, 2010 10-14) 3GPP TSG-RAN WG1#61 document R1-102630 in a kind of codebook structure has been described, it is incorporated herein by reference.

Being used for the first proposal of codebook structure, mainly process pre-encoder matrix W in the broadband meaning ₁, minimize communications channel in Spatial Dimension is so that the communication channel matrix H * W of equal value that obtains ₁Have than the lower dimension of physical transfer communication channel matrix H (for example, have the size that Nr takes advantage of Nt, wherein Nt and Nr are respectively the numbers of transmitting antenna and reception antenna).Pass through matrix W ₂Process the further combination (common phase position) of two all the other dimensions (or wave beam) (for cross-polarized antenna) or the orthogonalization between the stream, this is applicable in other frequency selectivity mode of sub-band levels.Pre-encoder matrix W ₁Be block diagonal matrix, wherein, each piece comprises the discrete Fourier transform matrix column of over-sampling.Two matrix W ₂And W ₁Careful design can allow to support to utilize cross polarization and the uniform linear array antenna configuration of same codebook.This passes through matrix W ₁Use 4 bits and to matrix W ₂Realize with two bits.(for example, corresponding or corresponding with each piece of four co-polarization transmission antenna unit in the situation of the cross-polarized 8 transmitting antennas configuration of supposition with the configuration of four emission uniform linear arrays) is used for matrix W in the situation of four antenna transmissions ₁4 bits convert in essence over-sampling coefficient for four discrete Fourier transform matrixes to.Be used for matrix W ₂Code book in clauses and subclauses comprise 2 transmitting antenna code books of version 8, this concept also solves the operation of the transmission rank 1-2 in the version 10 simultaneously.At W ₁Matrix structure has been applicable to after the communication channel, pre-encoder matrix W ₂Purpose be to process cross polarization combination (common phase position and orthogonalization), and provide the support for the uniform linear array operation, all are based on W ₂The subband rank that operates in of matrix is finished in the frequency selectivity mode.

In addition/alternatively, under the constraint of low-down related feedback overhead, can design some subscriber equipment feedback report patterns (for example, physically line link control channel (" PUCCH ") on).Under latter event, meaningfully, for example consider to carry out W with wide band system ₂And W ₁Matrix is selected and is reported both.The main difference part of comparing with the wave beam grid of routine is, feedback is based on dicode Ben Geshi or structure, wherein, and the operation of the similar wave beam grid of the array that this form is used for utilizing identical feedback to be provided for uniform linear array and cross polarization type.The problem of utilizing this scheme is that (that is, when azimuth expansion was higher, this scheme was not supported the SU-MIMO performance improved) that aforementioned content is mentioned just.

In second proposes, pre-encoder matrix W ₁From the discrete Fourier transform matrix of over-sampling, select the set of column vector.For the situation of cross polarised antenna, create four antenna beams according to polarity, and use 8 wave beams for uniform linear array.For matrix W ₁Signaling is used 1 bit, and code book is divided into two nonoverlapping parts with code word (wave beam) space, and selects one of them to be further used for via pre-encoder matrix W ₂Fine setting on the subband rank or suitable wave beam adjustment.Notice, select in the space at a bit that the predefine wave beam is to be used for further processing; Therefore, in the situation of 8 transmitting antennas, because exist by a W ₁8 wave beams that matrix limits, matrix W ₁Size be 8 * 16 matrix.At title be " 8Tx Codebook Design " (Montreal, Canada, in May, 2010 10-14) 3GPP TSG-RAN WG1#61 document R1-102823 in codebook structure has been described, it is incorporated herein by reference.

Also note, be with the main difference part of previous proposal, utilize matrix W ₁Minimize communications channel in Spatial Dimension.Allow to utilize matrix W ₂Process larger space (that is, having full communication channel dimension) in an enterprising step of subband rank and can be considered one advantage in the concept, particularly in the situation of the SU-MIMO transmission with the expansion of larger azimuth and higher transmission order.Send pre-encoder matrix W by four bits with signal ₂, and related code book comprises combiner and beam selection device.

Particularly in above-mentioned SU-MIMO situation, because by matrix W ₁Mainly cutting apart of operation and cause in every subband selecting the freedom of a plurality of wave beams can be considered advantage.Yet, because by a matrix W ₁The beam space that limits causes very greatly matrix W ₁Can't use separately well, so this flexibility has brought the shortcoming of himself.In addition, owing to utilize matrix W ₁Two spaces that create and cause having relatively poor coverage for the subscriber equipment of the infall that is positioned at the space.

In the 3rd proposes, pass through matrix W ₁, support a plurality of wave beams for every subband.The second pre-encoder matrix W ₂Again limit W by premultiplication ₁(that is, W ₂* W ₁), thereby the rotation of execution initial beam.The first code book is (that is, with matrix W ₁The code book that is associated) also comprise along the combiner of main wave beam, and have the altogether size of 32 wave beams, and the second code book is (that is, with W ₂The code book that is associated) can only have 2-3 bit, comprise some spin matrixs.In fact, only exist two interpolar combiners to can be used for cross-polarized operation, this can be considered shortcoming.Be used for matrix W ₁Codebook subset restriction also be possible.Be " Views on the Feedback Framework for Rel.10 " (Montreal at title, Canada, in May, 2010 10-14) 3GPP TSG-RAN WG1#61 document R1-103026 in codebook structure has been described, it is incorporated herein by reference.

Below the general introduction of the concept of main proposition has been described in table 1:

Table I

Consideration is for matrix W ₁And W ₂Same time report (this affects the utilization of physics uplink shared channel (" PUSCH ")) and have matrix W ₂6 PRB granularities and 10 milliseconds of (" ms ") cycles 50 Physical Resource Block (" PRB ") of being used for report, following table 2 has illustrated the feedback velocity of the concept of main proposition.

Table II

As described here, the codebook structure that provides for the improved support of the situation with low spatial correlation/high azimuth expansion has been described, wherein, need improved frequency selectivity feedback for superperformance.Code book form or structure also provide improved support for the higher transmission order, particularly for the situation of uniform linear array.

As previously mentioned, codebook structure based on similar wave beam in groups (that is, the first of feedback signal carries out the wave beam group selection, and the second portion of feedback signal is carried out the beam selection from selected wave beam group) in second proposes.The first of feedback is applicable to whole frequency band or broadband attribute, and the second portion of feedback is specific to subband.As special circumstances, the second portion of feedback also can be used with wide band system.At this in particular cases, should be appreciated that for information feedback to have single subband that wherein width equals the broadband system bandwidth.For the wave beam group selection of supporting to utilize dicode Ben Geshi or structure with from the beam selection of selected wave beam group, there is the pre-encoder matrix W that for example comprises based on the submatrix of discrete Fourier transform ₁And the pre-encoder matrix W that comprises column selection vector sum phase shifts ₂, so that determine actual beam in the wave beam group by the matrix multiplication of following form:

W＝W ₁*W ₂。

As described here, the wave beam group can be overlapping.Overlapping wave beam group is intended to cover the situation with the expansion of higher azimuth, and wherein, the broadband of enhancing/long-term direction of transfer is in " edge " or in other words at the boundary of two wave beam groups.Do not exist under these circumstances the wave beam group overlapping, utilize precoding may not capture the part that the azimuth is expanded, because it falls into the adjacent beams group.It is overlapping that to be often referred to total angle domain (or angle domain) that the wave beam group strides be overlapping.Angle domain can refer to that the direction of maximum array gain of the first wave beam from the wave beam group is to the angular range of the direction of the maximum array gain of last wave beam, perhaps equally, the maximum possible angular range aspect the direction of the gain of the maximum array between any two wave beams in the wave beam group.Overlapping special circumstances of such wave beam group are that the wave beam group partly comprises identical wave beam.In this case, can partly make up different matrix W according to identical column vector ₁

Secondly, transmission rank is depended in the number of wave beam group and/or wave beam group size (number of the wave beam in this group) and/or wave beam group total angle territory (angular range that the wave beam group is striden).Common 8 transmitting antenna arrays have the physically very near antenna in interval.Because higher transmission rank adopts quite incoherent communication channel, so the expansion of communication channel azimuth must be very large to support the transmission of higher rank.In the situation of dicode Ben Geshi or structure, if the wave beam group is big or small and total large must being enough to so that it covers large-scale azimuth angle of angle domain, then can suitably catch so high azimuth expansion.Therefore, for the higher transmission order, should be so that wave beam group size and total angle domain be larger.Therefore, two aspects introducing can be combined.Make up overlapping wave beam group, wherein size, number and the angle domain of overlapping wave beam group can change according to transmission rank.

As introducing in the exemplary embodiment here, select and possible overlapping wave beam prescription face provides this explanation in the wave beam group of from the set of wave beam group, selecting with from the beam subset of selected wave beam group.This describes and code book form or structure aspects can be changed equally in matrix/vector.The W that converts the transmission rank under the broadband take code book as target and/or the long-term attribute to or be associated with broadband take code book as target and/or the transmission rank under the long-term attribute specific to the set of the wave beam group of transmission rank ₁The set of matrix.The number of the wave beam group in the wave beam group set depends on that transmission rank refers to the W in the set of matrices with given rank correlation connection ₁The number of matrix depends on order itself.The W that switched-beam in the given wave beam group becomes to be associated with the wave beam group ₁Particular column vector in the matrix or equally, resulting pre-encoder matrix W=W ₁* W ₂Particular column.Therefore, the number of the wave beam in the wave beam group converts the number of the row in the related precoder to.Wave beam group in the wave beam group set overlapping can be described to and have other precoders (for example, other W that are associated with other wave beam groups in the set of wave beam group ₁Matrix or a plurality of matrix) in precoder (for example, the W that is associated of the wave beam group of subset of the column vector that finds ₁Matrix).For example convert matrix (for example, the W that is associated from selected wave beam group to from selected wave beam group selection beam subset ₁Matrix) selects column selection vector/matrix (for example, W of row subset in ₂Matrix).In addition, can utilize other vectors or matrix precoder component process wave beam common phase position on the subband rank or orthogonalization (for example, except the column selection element, W ₂Comprise phase shifter).

Therefore, employing subscriber equipment feedback, wherein, subscriber equipment is measure channel state information at first, and then from the set of wave beam group, select the wave beam group according to broadband or long-term channel state information, wherein, the size of each wave beam group (namely, the number of the wave beam in each wave beam group of wave beam group set) and/or the number of wave beam group (namely, the number of the wave beam group in the set of wave beam group) and/or total angle domain of being striden by each wave beam group (namely, total angle domain of in each the wave beam group in the wave beam group set, striding to the direction of the maximum array gain of last wave beam from the direction of the maximum array gain of the first wave beam) depends on transmission rank, and/or wherein different wave beam group is overlapping.In other words, the characteristic of wave beam group set comprises one of the following at least: total angle domain of striding to the direction of the maximum array gain of last wave beam from the direction of the maximum array gain of the first wave beam in the number of the wave beam group in the number of the wave beam in each wave beam group of wave beam group set, the set of wave beam group and each the wave beam group in the set of wave beam group.For each subband, subscriber equipment is selected beam subset in selected wave beam group, and the size of wherein said subset equals transmission rank.In addition, selected beam subset can comprise orthogonal wave beam.Subscriber equipment is encoded into the employing matrix W with feedback information ₁And W ₂Dicode this or precoder form, transmitting in uplink communication channel, and transmit dicode Ben Geshi to the base station.

The base station is received in the feedback that transmits on the uplink communication channel, feedback information is decoded, and convert thereof into dicode this or precoder form or structure (that is, converts matrix W to ₁And W ₂).The base station is for example by following matrix multiplication, based on matrix W ₁And W ₂Calculate the final precoder (that is, antenna weight) that will be used for for the transmission of subscriber equipment by frequency subband:

W＝W ₁*W ₂。

When transmitting data to subscriber equipment, the base station is carried out antenna weighting according to the weight in the matrix W to the subband of dispatching.

In order to calculate the feedback to the base station, subscriber equipment is measure channel state information at first.In the situation based on the communication system of LTE, can carry out this measurement with reference signal, reference signal is the CSI-RS in the situation of the CSI-RS under 8 transmit antenna case or 4 transmitting antennas (or still less) for example.Then, subscriber equipment obtains to be used for the channel condition information of whole system bandwidth.

In case subscriber equipment has obtained channel condition information, just can calculate feedback (that is, subscriber equipment determines that wave beam group and selection are used for the wave beam of each subband).In the situation of dicode Ben Geshi or structure, subscriber equipment is selected broadband/long-term pre-encoder matrix W ₁, and at selected pre-encoder matrix W ₁Condition under, select to be used for the pre-encoder matrix W of each subband ₂In one aspect, utilize matrix W ₁Select the wave beam group, and pre-encoder matrix W ₁And W ₂In each wave beam group, form together final wave beam (precoder).Then, adopt matrix multiplication to make up final precoder:

W＝W ₁*W ₂。

Forward now Fig. 6 A and Fig. 6 B to, illustrate the diagrammatic representation that forms the embodiment of wave beam group according to the principle of the invention.Should be appreciated that the azimuthal gain characteristic of particular transmission wave beam and uneven and accurately be limited in the angle domain such as in the accompanying drawings expression.In Fig. 6 A, illustrate 4 wave beam groups for the situation of transmission rank 1-2, each wave beam group comprises for example 4 wave beams.As among Fig. 6 B for shown in the transmission rank 3-4, have two wave beam groups, but have larger wave beam group angle (azimuth) territory, each group comprises for example 8 wave beams.Total angle domain that the number of the size of wave beam group and/or wave beam group and/or wave beam group are striden depends on transmission rank.Below proposed to be used for supporting the pre-encoder matrix W of this form or structure ₁, W ₂Exemplary code book clauses and subclauses.

Forward now Fig. 7 A and Fig. 7 B to, illustrate the diagrammatic representation that forms the embodiment of wave beam group according to the principle of the invention.In illustrated embodiment, the wave beam group is overlapping.Notice that the angle domain that the number of wave beam group, size and each wave beam group are striden depends on transmission rank.Such form or the exemplary code book clauses and subclauses of structure have below been proposed to be used for.

The two knows the code book that uses these principles to make up base station and subscriber equipment.Subscriber equipment can be selected code-book entry with for example following example matrix selection scheme.At first, subscriber devices compute broadband communication channel space covariance matrix R:

R＝E{H ^HH}，

Wherein, E is expectation operator, and subscript operator " H " expression Hermitian operator (that is, corresponding matrix being carried out conjugation and transposition).Again, (non-subscript) H represents the communication channel matrix.Then, the subscriber equipment utilization, such as but not limited to, one in the following mode is come selection matrix W ₁

In illustrative methods, subscriber equipment is by for matrix W ₁And W ₂All possible selection in scan (search) and form the combination of all matrix,

W＝W ₁*W ₂

This search can be used for matrix W ₂Broadband (that is, in the whole system bandwidth) finish, with the limit calculation complexity.Then, subscriber equipment finds the relatively pre-encoder matrix W of two norm (projection two-norm) distances of string, Fu Bini-Shi Tu or projection of V of minimizing (for example, minimizing), matrix S wherein,

R＝USV ^H

It is the singular value decomposition of matrix R.Matrix U and V are and matrix R are converted to the customization unitary matrice that diagonal matrix S is associated.Pre-encoder matrix W ₁Be selected as and strengthen corresponding one of (for example, optimum) W.

In another illustrative methods, subscriber equipment passes through matrix W ₁And W ₂All possible selection scan all combinations that (for example, on the meaning of broadband) forms matrix.

W＝W ₁*W ₂。

Then, subscriber equipment finds the pre-encoder matrix W of enhancing (for example, maximization) ability (for example, maximizing following expression formula):

$\det (I+\frac{1}{{\mathrm{\σ}}^2}{W}^H\mathrm{RW}).$

Pre-encoder matrix W ₁Corresponding one of (for example, the optimum) W that is selected as and strengthens.

In order to reduce the complexity of said method, combination

W＝W ₁*W ₂

Can be sampled, so that for example be selected as the representative of wave beam group from only wave beam of each wave beam group, and finish selection based on the subset of matrix W, selective enhancement (for example, maximization) $\det (I+\frac{1}{{\mathrm{\σ}}^2}{W_1}^H{\mathrm{RW}}_1)$ Matrix W ₁

The second option is selective enhancement (for example, maximization) trace (W ₁ ^HRW ₁) matrix W ₁In case selected broadband/long-term pre-encoder matrix W ₁, just in matrix W ₁The condition of selection under, for example by finding the pre-encoder matrix W that strengthens (for example, maximization) throughput at given subband ₂Come to select pre-encoder matrix W by frequency subband ₂

In case subscriber equipment has been determined the wave beam group and has determined beam selection in this wave beam group by subband that subscriber equipment just encodes to transmit in uplink communication channel to this selection.Matrix W ₁And W ₂The two is encoded as the index in base station and the two known code book of subscriber equipment.Subscriber equipment transmits selected matrix W to the base station ₁Index and the matrix W of selection ₂Index (for example, dicode Ben Geshi).In the situation based on the communication system of LTE, the uplink communication channel that is used for feedback transmission can be physical uplink control channel (" PUCCH ") or PUSCH.In the situation of PUCCH, consider at least two alternative signaling solutions.

In a signaling solution, matrix W ₁Index can be coded in the PUCCH report with the transmission rank designator and matrix W ₂Index can be coded in another PUCCH report with CQI (" CQI ").In another signaling solution, in PUCCH report, transmit discretely the transmission rank designator, and in another PUCCH report, transmit matrix W ₁Index and matrix W ₂Index and CQI.In the exemplary embodiment, can be used for matrix W with identical frequency report ₁Data and be used for matrix W ₂Data, perhaps can use than being used for matrix W ₁The higher frequency of data report for matrix W ₂Data.In the situation of PUSCH, can in a PUSCH report, transmit all information that comprise transmission rank designator, two code book indexes (for example, dicode Ben Geshi) and CQI.Opposite with PUCCH, usually trigger the transmission of PUSCH feedback report by the base station, this periodically occurs according to some semi-static configurations.

The base station obtains final pre-encoder matrix according to the result of matrix multiplication,

W＝W ₁*W ₂。

Any one of codebook matrix is not self-contained, and it is favourable receiving two matrixes in a report.Yet, because matrix W ₁When utilizing the broadband of communication channel/long-term attribute, therefore can utilize lower time cycle property to carry out matrix W ₁Report, and can come sending metrix W with higher time cycle property ₂Fine setting.Suppose matrix W ₁Along with the time quite stable and carried out the inerrancy transmission, can adopt such uncoupling signaling.

Be described in now in the situation of transmission rank 1-4 operation the exemplary code the design to the wave beam group that depends on transmission rank.In this exemplary design, in the situation of transmission rank 1 and 2, there are 4 wave beam groups, and in the situation of transmission rank 3 and 4, have two wave beam groups of striding larger beam space.Use based on the block diagonal matrix of discrete Fourier transform and come 4 wave beam groups in the following situation that is described in transmission rank 1 and 2.

$W_1^{\left(\mathrm{1,2}\right)}\left(0\right)=\frac{1}{2}\left[\begin{array}{cccccccc}1& 1& 1& 1& 0& 0& 0& 0\\ 1& e^{i\frac{\mathrm{\π}}{8}}& e^{i\frac{\mathrm{\π}}{4}}& e^{i\frac{3\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 1& e^{i\frac{\mathrm{\π}}{4}}& i& e^{i\frac{3\mathrm{\π}}{4}}& 0& 0& 0& 0\\ 1& e^{i\frac{3\mathrm{\π}}{8}}& e^{i\frac{3\mathrm{\π}}{4}}& e^{i\frac{9\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 0& 0& 0& 0& 1& 1& 1& 1\\ 0& 0& 0& 0& 1& e^{i\frac{\mathrm{\π}}{8}}& e^{i\frac{\mathrm{\π}}{4}}& e^{i\frac{3\mathrm{\π}}{8}}\\ 0& 0& 0& 0& 1& e^{i\frac{\mathrm{\π}}{4}}& i& e^{i\frac{3\mathrm{\π}}{4}}\\ 0& 0& 0& 0& 1& e^{i\frac{3\mathrm{\π}}{8}}& e^{i\frac{3\mathrm{\π}}{4}}& e^{i\frac{9\mathrm{\π}}{8}}\end{array}\right]$

$W_1^{\left(\mathrm{1,2}\right)}\left(1\right)=\frac{1}{2}\left[\begin{array}{cccccccc}1& 1& 1& 1& 0& 0& 0& 0\\ i& e^{i\frac{5\mathrm{\π}}{8}}& e^{i\frac{3\mathrm{\π}}{4}}& e^{i\frac{7\mathrm{\π}}{8}}& 0& 0& 0& 0\\ -1& e^{i\frac{5\mathrm{\π}}{4}}& -i& e^{i\frac{7\mathrm{\π}}{4}}& 0& 0& 0& 0\\ -i& e^{i\frac{15\mathrm{\π}}{8}}& e^{i\frac{\mathrm{\π}}{4}}& e^{i\frac{5\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 0& 0& 0& 0& 1& 1& 1& 1\\ 0& 0& 0& 0& i& e^{i\frac{5\mathrm{\π}}{8}}& e^{i\frac{3\mathrm{\π}}{4}}& e^{i\frac{7\mathrm{\π}}{8}}\\ 0& 0& 0& 0& -1& e^{i\frac{5\mathrm{\π}}{4}}& -i& e^{i\frac{7\mathrm{\π}}{4}}\\ 0& 0& 0& 0& -i& e^{i\frac{15\mathrm{\π}}{8}}& e^{i\frac{\mathrm{\π}}{4}}& e^{i\frac{5\mathrm{\π}}{8}}\end{array}\right]$

$W_1^{\left(\mathrm{1,2}\right)}\left(2\right)=\frac{1}{2}\left[\begin{array}{cccccccc}1& 1& 1& 1& 0& 0& 0& 0\\ -1& e^{i\frac{9\mathrm{\π}}{8}}& e^{i\frac{5\mathrm{\π}}{4}}& e^{i\frac{11\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 1& e^{i\frac{\mathrm{\π}}{4}}& i& e^{i\frac{3\mathrm{\π}}{4}}& 0& 0& 0& 0\\ -1& e^{i\frac{11\mathrm{\π}}{8}}& e^{i\frac{7\mathrm{\π}}{4}}& e^{i\frac{\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 0& 0& 0& 0& 1& 1& 1& 1\\ 0& 0& 0& 0& -1& e^{i\frac{9\mathrm{\π}}{8}}& e^{i\frac{5\mathrm{\π}}{4}}& e^{i\frac{11\mathrm{\π}}{8}}\\ 0& 0& 0& 0& 1& e^{i\frac{\mathrm{\π}}{4}}& i& e^{i\frac{3\mathrm{\π}}{4}}\\ 0& 0& 0& 0& -1& e^{i\frac{11\mathrm{\π}}{8}}& e^{i\frac{7\mathrm{\π}}{4}}& e^{i\frac{\mathrm{\π}}{8}}\end{array}\right]$

$W_1^{\left(\mathrm{1,2}\right)}\left(3\right)=\frac{1}{2}\left[\begin{array}{cccccccc}1& 1& 1& 1& 0& 0& 0& 0\\ -i& e^{i\frac{13\mathrm{\π}}{8}}& e^{i\frac{7\mathrm{\π}}{4}}& e^{i\frac{15\mathrm{\π}}{8}}& 0& 0& 0& 0\\ -1& e^{i\frac{5\mathrm{\π}}{4}}& -i& e^{i\frac{7\mathrm{\π}}{4}}& 0& 0& 0& 0\\ i& e^{i\frac{7\mathrm{\π}}{8}}& e^{i\frac{5\mathrm{\π}}{4}}& e^{i\frac{13\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 0& 0& 0& 0& 1& 1& 1& 1\\ 0& 0& 0& 0& -i& e^{i\frac{13\mathrm{\π}}{8}}& e^{i\frac{7\mathrm{\π}}{4}}& e^{i\frac{15\mathrm{\π}}{8}}\\ 0& 0& 0& 0& -1& e^{i\frac{5\mathrm{\π}}{4}}& -i& e^{i\frac{7\mathrm{\π}}{4}}\\ 0& 0& 0& 0& i& e^{i\frac{7\mathrm{\π}}{8}}& e^{i\frac{5\mathrm{\π}}{4}}& e^{i\frac{13\mathrm{\π}}{8}}\end{array}\right]$

Two wave beam groups in can the situation of following description transmission rank 3-4:

$W_1^{\left(\mathrm{3,4}\right)}\left(n\right)=\frac{1}{2}\·\left[\begin{array}{cc}X\left(n\right)& 0\\ 0& X\left(n\right)\end{array}\right],n=\mathrm{0,1}$

Wherein,

$X\left(n\right)=\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& {(-1)}^n& 0& 0\\ 0& 0& 1& 0\\ 0& 0& 0& {(-1)}^n\end{array}\right]\left[\begin{array}{ccccc}1& 1& 1& ...& 1\\ 1& e^{j\frac{\mathrm{\π}}{8}}& e^{j\left(2\right)\frac{\mathrm{\π}}{8}}& ...& e^{j\left(7\right)\frac{\mathrm{\π}}{8}}\\ 1& e^{j\left(2\right)\frac{\mathrm{\π}}{8}}& e^{j\left(2\right)\left(2\right)\frac{\mathrm{\π}}{8}}& ...& e^{j\left(7\right)\left(2\right)\frac{\mathrm{\π}}{8}}\\ 1& e^{j\left(3\right)\frac{\mathrm{\π}}{8}}& e^{j\left(2\right)\left(3\right)\frac{\mathrm{\π}}{8}}& ...& e^{j\left(7\right)\left(3\right)\frac{\mathrm{\π}}{8}}\end{array}\right]$

Corresponding W ₂Vector/matrix comprises the beam selection vector, multiply by plural number so that the phase-shifts of vector.In table 3, only listed those that are used for transmission rank-1, and by transmission rank 2-4 beam selection vector being carried out suitable phase shift, deferred to like the design class of transmission rank 2-4.In following Table III, e _i4 * 1 vectors of i wave beam are selected in expression, for example,

e ₂＝[0?1?0?0] ^T。

Table III

The exemplary code the design for overlapping wave beam group who is used for transmission rank 1-2 operation is described now.In this exemplary design, there are partly overlapping 8 wave beam groups.Be set to identical so that this overlaps W by some row in two adjacency matrixs ₁In the matrix as seen.

$W_1^{\left(\mathrm{1,2}\right)}\left(0\right)=\frac{1}{2}\left[\begin{array}{cccccccc}1& 1& 1& 1& 0& 0& 0& 0\\ 1& e^{i\frac{\mathrm{\π}}{8}}& e^{i\frac{\mathrm{\π}}{4}}& e^{i\frac{3\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 1& e^{i\frac{\mathrm{\π}}{4}}& i& e^{i\frac{3\mathrm{\π}}{4}}& 0& 0& 0& 0\\ 1& e^{i\frac{3\mathrm{\π}}{8}}& e^{i\frac{3\mathrm{\π}}{4}}& e^{i\frac{9\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 0& 0& 0& 0& 1& 1& 1& 1\\ 0& 0& 0& 0& 1& e^{i\frac{\mathrm{\π}}{8}}& e^{i\frac{\mathrm{\π}}{4}}& e^{i\frac{3\mathrm{\π}}{8}}\\ 0& 0& 0& 0& 1& e^{i\frac{\mathrm{\π}}{4}}& i& e^{i\frac{3\mathrm{\π}}{4}}\\ 0& 0& 0& 0& 1& e^{i\frac{3\mathrm{\π}}{8}}& e^{i\frac{3\mathrm{\π}}{4}}& e^{i\frac{9\mathrm{\π}}{8}}\end{array}\right]$

$W_1^{\left(\mathrm{1,2}\right)}\left(1\right)=\frac{1}{2}\left[\begin{array}{cccccccc}1& 1& 1& 1& 0& 0& 0& 0\\ e^{i\frac{\mathrm{\π}}{4}}& e^{i\frac{3\mathrm{\π}}{8}}& i& e^{i\frac{5\mathrm{\π}}{8}}& 0& 0& 0& 0\\ i& e^{i\frac{3\mathrm{\π}}{4}}& -1& e^{i\frac{5\mathrm{\π}}{4}}& 0& 0& 0& 0\\ e^{i\frac{3\mathrm{\π}}{4}}& e^{i\frac{9\mathrm{\π}}{8}}& -i& e^{i\frac{15\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 0& 0& 0& 0& 1& 1& 1& 1\\ 0& 0& 0& 0& e^{i\frac{\mathrm{\π}}{4}}& e^{i\frac{3\mathrm{\π}}{8}}& i& e^{i\frac{5\mathrm{\π}}{8}}\\ 0& 0& 0& 0& i& e^{i\frac{3\mathrm{\π}}{4}}& -1& e^{i\frac{5\mathrm{\π}}{4}}\\ 0& 0& 0& 0& e^{i\frac{3\mathrm{\π}}{4}}& e^{i\frac{9\mathrm{\π}}{8}}& -i& e^{i\frac{15\mathrm{\π}}{8}}\end{array}\right]$

$W_1^{\left(\mathrm{1,2}\right)}\left(2\right)=\frac{1}{2}\left[\begin{array}{cccccccc}1& 1& 1& 1& 0& 0& 0& 0\\ i& e^{i\frac{5\mathrm{\π}}{8}}& e^{i\frac{3\mathrm{\π}}{4}}& e^{i\frac{7\mathrm{\π}}{8}}& 0& 0& 0& 0\\ -1& e^{i\frac{5\mathrm{\π}}{4}}& -i& e^{i\frac{7\mathrm{\π}}{4}}& 0& 0& 0& 0\\ -i& e^{i\frac{15\mathrm{\π}}{8}}& e^{i\frac{\mathrm{\π}}{4}}& e^{i\frac{5\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 0& 0& 0& 0& 1& 1& 1& 1\\ 0& 0& 0& 0& i& e^{i\frac{5\mathrm{\π}}{8}}& e^{i\frac{3\mathrm{\π}}{4}}& e^{i\frac{7\mathrm{\π}}{8}}\\ 0& 0& 0& 0& -1& e^{i\frac{5\mathrm{\π}}{4}}& -i& e^{i\frac{7\mathrm{\π}}{4}}\\ 0& 0& 0& 0& -i& e^{i\frac{15\mathrm{\π}}{8}}& e^{i\frac{\mathrm{\π}}{4}}& e^{i\frac{5\mathrm{\π}}{8}}\end{array}\right]$

$W_1^{\left(\mathrm{1,2}\right)}\left(3\right)=\frac{1}{2}\left[\begin{array}{cccccccc}1& 1& 1& 1& 0& 0& 0& 0\\ e^{i\frac{3\mathrm{\π}}{4}}& e^{i\frac{7\mathrm{\π}}{8}}& -1& e^{i\frac{9\mathrm{\π}}{8}}& 0& 0& 0& 0\\ -i& e^{i\frac{7\mathrm{\π}}{4}}& 1& e^{i\frac{\mathrm{\π}}{4}}& 0& 0& 0& 0\\ e^{i\frac{\mathrm{\π}}{4}}& e^{i\frac{5\mathrm{\π}}{8}}& -1& e^{i\frac{11\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 0& 0& 0& 0& 1& 1& 1& 1\\ 0& 0& 0& 0& e^{i\frac{3\mathrm{\π}}{4}}& e^{i\frac{7\mathrm{\π}}{8}}& -1& e^{i\frac{9\mathrm{\π}}{8}}\\ 0& 0& 0& 0& -i& e^{i\frac{7\mathrm{\π}}{4}}& 1& e^{i\frac{\mathrm{\π}}{4}}\\ 0& 0& 0& 0& e^{i\frac{\mathrm{\π}}{4}}& e^{i\frac{5\mathrm{\π}}{8}}& -1& e^{i\frac{11\mathrm{\π}}{8}}\end{array}\right]$

$W_1^{\left(\mathrm{1,2}\right)}\left(4\right)=\frac{1}{2}\left[\begin{array}{cccccccc}1& 1& 1& 1& 0& 0& 0& 0\\ -1& e^{i\frac{9\mathrm{\π}}{8}}& e^{i\frac{5\mathrm{\π}}{4}}& e^{i\frac{11\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 1& e^{i\frac{\mathrm{\π}}{4}}& i& e^{i\frac{3\mathrm{\π}}{4}}& 0& 0& 0& 0\\ -1& e^{i\frac{11\mathrm{\π}}{8}}& e^{i\frac{7\mathrm{\π}}{4}}& e^{i\frac{\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 0& 0& 0& 0& 1& 1& 1& 1\\ 0& 0& 0& 0& -1& e^{i\frac{9\mathrm{\π}}{8}}& e^{i\frac{5\mathrm{\π}}{4}}& e^{i\frac{11\mathrm{\π}}{8}}\\ 0& 0& 0& 0& 1& e^{i\frac{\mathrm{\π}}{4}}& i& e^{i\frac{3\mathrm{\π}}{4}}\\ 0& 0& 0& 0& -1& e^{i\frac{11\mathrm{\π}}{8}}& e^{i\frac{7\mathrm{\π}}{4}}& e^{i\frac{\mathrm{\π}}{8}}\end{array}\right]$

$W_1^{\left(\mathrm{1,2}\right)}\left(5\right)=\frac{1}{2}\left[\begin{array}{cccccccc}1& 1& 1& 1& 0& 0& 0& 0\\ e^{i\frac{5\mathrm{\π}}{4}}& e^{i\frac{11\mathrm{\π}}{8}}& -i& e^{i\frac{13\mathrm{\π}}{8}}& 0& 0& 0& 0\\ i& e^{i\frac{3\mathrm{\π}}{4}}& -1& e^{i\frac{5\mathrm{\π}}{4}}& 0& 0& 0& 0\\ e^{i\frac{7\mathrm{\π}}{4}}& e^{i\frac{\mathrm{\π}}{8}}& i& e^{i\frac{7\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 0& 0& 0& 0& 1& 1& 1& 1\\ 0& 0& 0& 0& e^{i\frac{5\mathrm{\π}}{4}}& e^{i\frac{11\mathrm{\π}}{8}}& -i& e^{i\frac{13\mathrm{\π}}{8}}\\ 0& 0& 0& 0& i& e^{i\frac{3\mathrm{\π}}{4}}& -1& e^{i\frac{5\mathrm{\π}}{4}}\\ 0& 0& 0& 0& e^{i\frac{7\mathrm{\π}}{4}}& e^{i\frac{\mathrm{\π}}{8}}& i& e^{i\frac{7\mathrm{\π}}{8}}\end{array}\right]$

$W_1^{\left(\mathrm{1,2}\right)}\left(6\right)=\frac{1}{2}\left[\begin{array}{cccccccc}1& 1& 1& 1& 0& 0& 0& 0\\ -i& e^{i\frac{13\mathrm{\π}}{8}}& e^{i\frac{7\mathrm{\π}}{4}}& e^{i\frac{15\mathrm{\π}}{8}}& 0& 0& 0& 0\\ -1& e^{i\frac{5\mathrm{\π}}{4}}& -i& e^{i\frac{7\mathrm{\π}}{4}}& 0& 0& 0& 0\\ i& e^{i\frac{7\mathrm{\π}}{8}}& e^{i\frac{5\mathrm{\π}}{4}}& e^{i\frac{13\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 0& 0& 0& 0& 1& 1& 1& 1\\ 0& 0& 0& 0& -i& e^{i\frac{13\mathrm{\π}}{8}}& e^{i\frac{7\mathrm{\π}}{4}}& e^{i\frac{15\mathrm{\π}}{8}}\\ 0& 0& 0& 0& -1& e^{i\frac{5\mathrm{\π}}{4}}& -i& e^{i\frac{7\mathrm{\π}}{4}}\\ 0& 0& 0& 0& i& e^{i\frac{7\mathrm{\π}}{8}}& e^{i\frac{5\mathrm{\π}}{4}}& e^{i\frac{13\mathrm{\π}}{8}}\end{array}\right]$

$W_1^{\left(\mathrm{1,2}\right)}\left(7\right)=\frac{1}{2}\left[\begin{array}{cccccccc}1& 1& 1& 1& 0& 0& 0& 0\\ e^{i\frac{7\mathrm{\π}}{4}}& e^{i\frac{15\mathrm{\π}}{8}}& 1& e^{i\frac{\mathrm{\π}}{8}}& 0& 0& 0& 0\\ -i& e^{i\frac{7\mathrm{\π}}{4}}& 1& e^{i\frac{\mathrm{\π}}{4}}& 0& 0& 0& 0\\ e^{i\frac{5\mathrm{\π}}{4}}& e^{i\frac{13\mathrm{\π}}{8}}& 1& e^{i\frac{3\mathrm{\π}}{8}}& 0& 0& 0& 0\\ 0& 0& 0& 0& 1& 1& 1& 1\\ 0& 0& 0& 0& e^{i\frac{7\mathrm{\π}}{4}}& e^{i\frac{15\mathrm{\π}}{8}}& 1& e^{i\frac{\mathrm{\π}}{8}}\\ 0& 0& 0& 0& -i& e^{i\frac{7\mathrm{\π}}{4}}& 1& e^{i\frac{\mathrm{\π}}{4}}\\ 0& 0& 0& 0& e^{i\frac{5\mathrm{\π}}{4}}& e^{i\frac{13\mathrm{\π}}{8}}& 1& e^{i\frac{3\mathrm{\π}}{8}}\end{array}\right]$

Corresponding W ₂Vector/matrix and similar (that is, these matrixes comprise the beam selection column vector) in first exemplary code the design.

Therefore, can feed back the support that realizes in the situation of grid the improvement of higher azimuth expansion situation at beam shape.When in communication channel, having less spatial coherence (, when existing higher azimuth to expand), can catch better whole signal space in the frequency selectivity mode.Also be retained in the benefit that is used for the wave beam grid of MU-MIMO in the situation of height correlation.

Forward Fig. 8 to, illustrate in accordance with the principles of the present invention the diagrammatic representation of embodiment of the wave beam group of the situation that is used for transmission rank 1-2.The first wave beam group (being designated as wave beam group 1) comprises 4 wave beams, wherein the first wave beam 810 has the gain of maximum 6 decibels (" dB ") at the azimuth direction of zero degree, and the 4th wave beam 820 has the gain of maximum 6 decibels (" dB ") at the azimuth directions of-22 degree.The second wave beam group (being designated as wave beam group 2) comprises 4 wave beams, wherein the first wave beam 830 has the gain of maximum 6 decibels (" dB ") at the azimuth directions of 18 degree, and the 4th wave beam has the gain of maximum 6 decibels (" dB ") at the azimuth directions of-4 degree.The angular range 850 of the direction of the maximum array gain of direction to the four wave beams (last wave beam) 820 of the maximum array gain of the first wave beam 810 from the first wave beam group is 22 degree, and the angular range 860 of the direction of the maximum array gain of direction to the four wave beams (last wave beam) 840 of the maximum array of the first wave beam 830 in angle domain and from the second wave beam group (adjacent wave beam group) gain is overlapping.

Forward now Fig. 9 to, illustrate the flow chart of embodiment that comes the method for operation communication system according to the principle of the invention.After beginning step or module 910, the unit of communication system (for example, wherein subscriber equipment and/or base station) measures in step or module 920 about the channel condition information from the down link of base station.In step or module 930, identify the wave beam group of from the set of wave beam group, selecting according to the broadband attribute of channel condition information, wherein, the characteristic of wave beam group set depends on transmission rank.The characteristic of wave beam group set can be total angle domain of striding to the direction of the maximum array gain of last wave beam from the direction of the maximum array gain of the first wave beam in the number of number, the wave beam group in the set of wave beam group of the wave beam in each wave beam group of wave beam group set and/or each the wave beam group in the set of wave beam group.In step or module 940, in selected wave beam group, identify selected beam subset according at least one subband, wherein, the number of the wave beam in the selected beam subset equals transmission rank.

In step or module 950, generate encoder feedback information to identify selected wave beam group and to be used for the selected beam subset of each subband with dicode Ben Geshi.Dicode Ben Geshi is built as the first matrix of the selected wave beam group of expression and the second matrix that expression is used for the selected beam subset of each subband.Can adopt the set of the row that from the discrete Fourier transform matrix of over-sampling, obtain to form the first matrix.Therefore, the direction of the maximum array of the first wave beam from selected wave beam group gain to the angular range of the direction of the maximum array gain of last wave beam may be in angle domain and from the adjacent beams group the angular range of the direction that gains to the maximum array of last wave beam of the direction of maximum array gain of the first wave beam overlapping.Selected wave beam group can be used for driving 8 transmitting antennas of base station.According to encoder feedback information, in step or module 960, use dicode Ben Geshi (for example, in the base station) to form precoder in communication system, to transmit signal.The method finishes in step or module 970 places.

Therefore, introduced device, the method and system that is used for selecting in communication system wave beam group and beam subset here.In one embodiment, (for example, realize in subscriber equipment) that device comprises processor and the memory that comprises computer program code.Memory and computer program code are configured to, and utilize processor so that measurement device about the channel condition information from the down link of base station, and is identified the wave beam group of selecting from the set of wave beam group according to the broadband attribute of channel condition information.The characteristic of wave beam group set depends on transmission rank.Memory and computer program code further are configured to, and utilize processor so that device is identified the beam subset of the selection in the selected wave beam group according at least one subband.The number of the wave beam in the selected beam subset equals transmission rank.

In addition, memory and computer program code further are configured to, utilize processor so that device generates encoder feedback information with dicode Ben Geshi, this encoder feedback information is identified selected wave beam group and is used for the selected beam subset of each subband, and transmits encoder feedback information to the base station.Dicode Ben Geshi comprises the first matrix that represents selected wave beam group and represents to be used for the second matrix of the selected beam subset of each subband.The row that employing is obtained from the discrete Fourier transform matrix of over-sampling gather to form the first matrix.And the characteristic of wave beam group set comprises one of the following at least: the number of the wave beam group in the number of the wave beam in each wave beam group of wave beam group set, the set of wave beam group and total angle domain of striding to the direction of the maximum array gain of last wave beam from the direction of the maximum array gain of the first wave beam in each wave beam group of wave beam group set.In addition, selected wave beam group can be overlapping with the adjacent beams group in total angle domain (or angle domain).For example, the direction of the maximum array of the first wave beam from selected wave beam group gain to the angular range of the direction of the maximum array gain of last wave beam can be in angle domain and from the adjacent beams group the angular range of the direction that gains to the maximum array of last wave beam of the direction of maximum array gain of the first wave beam overlapping.And selected wave beam group can be take 8 transmitting antennas as feature.

In another embodiment, (for example, realize in the base station) that device comprises processor and the memory that comprises computer program code.Memory and computer program code are configured to, utilize processor and have the encoder feedback information of dicode Ben Geshi so that device receives from subscriber equipment, the selected beam subset that this encoder feedback information is used for identifying selected wave beam group and is used at least one subband.One of representing to conform to the broadband attribute of the channel condition information of being measured by subscriber equipment in the wave beam group set of selected wave beam group, and the characteristic that the wave beam group is gathered is based on transmission rank.And, in selected wave beam group, select selected beam subset according at least one subband, and the number of the wave beam in the selected beam subset equals transmission rank.Memory and computer program code further are configured to, and utilize processor so that device is formed for transmitting to subscriber equipment the precoder of signal with this form of dicode.Although about having described device described herein, method and system based on the communication system of honeycomb, apparatus and method are applicable to the communication system of other types equally, such as WiMax

Communication system.

Consist of that the program of various embodiment of the present invention or code segment can be stored in the computer-readable medium or transmit by transmission medium by the computer data signal in carrier wave, realized or by the signal of carrier modulation.For example, comprise that the computer program that is stored in the program code in the computer-readable medium can form various embodiment of the present invention." computer-readable medium " can comprise and can store or any medium of transmission information.The example of computer-readable medium comprises circuit, semiconductor memory devices, read-only memory (" ROM "), flash memory, erasable ROM (" EPROM "), floppy disk, compact disk (" CD ")-ROM, CD, hard disk, fiber medium, radio frequency (" RF ") link etc.Computer data signal can comprise can be at any signal of propagating such as the transmission medium of electronic communication network communication channel, optical fiber, aerial, electromagnetic links, RF link etc.Can download code segment via computer networks such as internet, Intranet.

As mentioned above, exemplary embodiment provides method and the corresponding intrument of the various modules that comprise the function that is provided for the manner of execution step.Module may be implemented as hardware (realizing that in one or more chips it comprises the integrated circuit such as application-specific integrated circuit (ASIC)), perhaps may be implemented as software or the firmware carried out for by computer processor.Particularly, in the situation of firmware or software, exemplary embodiment may be provided in computer program, and it comprises the computer-readable storage organization, realizes on it that computer program code (that is, software or firmware) is to be carried out by computer processor.

Although describe the present invention and advantage thereof here in detail, should be appreciated that and in the situation that does not deviate from the spirit and scope of the present invention that are defined by the following claims, to carry out various changes, substitute and change.For example, above-mentioned a lot of feature and function can make up to realize with software, hardware or firmware or its.And its step of a lot of features, function and operation can be reordered, omits, interpolation etc., and still drop in the broad range of the present invention.

In addition, scope of the present invention and being not intended to is limited to the specific embodiment of composition, parts, method or the step of process described in the specification, machine, goods, object.Those of ordinary skill in the art will easily understand open from of the present invention, can utilize according to the present invention and carry out substantially the same function or basically realize the result's identical with corresponding embodiment described herein current existence or composition, parts, method or the step of process that the back will be developed, machine, goods, object.Therefore, claims are intended to comprise composition, parts, method or the step of such process, machine, goods, object in its scope.

Claims (30)

1. device comprises:

Processor; And

Memory, described memory comprises computer program code;

Described memory and described computer program code are configured to, and utilize described processor to come so that described device is carried out at least:

Measurement is about the channel condition information from the down link of base station,

Identify the selecteed wave beam group of gathering from the wave beam group according to the broadband attribute of described channel condition information, wherein, the characteristic of described wave beam group set depends on transmission rank, and

Identify selecteed beam subset according at least one subband in described selecteed wave beam group, wherein, the number of the wave beam in the described selecteed beam subset equals described transmission rank.

2. device according to claim 1, wherein, described memory and described computer program code further are configured to, and utilize described processor to come so that described device is carried out at least:

Generate encoder feedback information with dicode Ben Geshi, the described selecteed beam subset that described encoder feedback information is used for identifying described selecteed wave beam group and is used for each subband, and

Transmit described encoder feedback information to described base station.

3. device according to claim 2, wherein, described dicode Ben Geshi comprises the second matrix that the first matrix of representing described selecteed wave beam group and expression are used for the described selecteed beam subset of each subband.

4. device according to claim 3 wherein, adopts the row that obtain from discrete Fourier transform (DFT) matrix of over-sampling to gather to form described the first matrix.

5. device according to claim 1, wherein, the described characteristic of described wave beam group set comprises one of the following at least: the number of the wave beam group in the number of the wave beam in each wave beam group of described wave beam group set, the set of described wave beam group and total angle domain of striding to the direction of the maximum array gain of last wave beam from the direction of the maximum array gain of the first wave beam in each wave beam group of described wave beam group set.

6. device according to claim 1, wherein, the direction of the maximum array of the first wave beam from described selecteed wave beam group gain is overlapping to the angular range of the direction of the maximum array gain of last wave beam to the direction of the maximum array gain of first wave beam of angular range in angle domain and from the adjacent beams group of the direction of the maximum array gain of last wave beam.

7. equipment comprises:

Be used for to measure about the device from the channel condition information of the down link of base station,

Be used for identifying according to the broadband attribute of described channel condition information the device of the selecteed wave beam group of gathering from the wave beam group, wherein, the characteristic of described wave beam group set depends on transmission rank, and

Be used for according to the device of at least one subband in the selecteed beam subset of described selecteed wave beam group identification, wherein, the number of the wave beam in the described selecteed beam subset equals described transmission rank.

8. equipment according to claim 7 further comprises:

Be used for generating with this form of dicode the device of encoder feedback information, the described selecteed beam subset that described encoder feedback information is used for identifying described selecteed wave beam group and is used for each subband; And

Be used for transmitting to described base station the device of described encoder feedback information.

9. a computer program comprises the program code that is stored in the computer-readable medium, and described program code is configured to:

Measurement is about the channel condition information from the down link of base station;

Identify the selecteed wave beam group of gathering from the wave beam group according to the broadband attribute of described channel condition information, wherein, the characteristic of described wave beam group set depends on transmission rank; And

Identify selecteed beam subset according at least one subband in described selecteed wave beam group, wherein, the number of the wave beam in the described selecteed beam subset equals described transmission rank.

10. computer program according to claim 9, wherein, the described program code that is stored in the described computer-readable medium is configured to:

Generate encoder feedback information with dicode Ben Geshi, described encoder feedback information is identified described selecteed wave beam group and is used for the described selecteed beam subset of each subband; And

Transmit described encoder feedback information to described base station.

11. a method comprises:

Measurement is about the channel condition information from the down link of base station;

Identify the selecteed wave beam group of gathering from the wave beam group according to the broadband attribute of described channel condition information, wherein, the characteristic of described wave beam group set depends on transmission rank; And

Identify selecteed beam subset according at least one subband in described selecteed wave beam group, wherein, the number of the wave beam in the described selecteed beam subset equals described transmission rank.

12. method according to claim 11 further comprises:

Generate encoder feedback information with dicode Ben Geshi, the described selecteed beam subset that described encoder feedback information is used for identifying described selecteed wave beam group and is used for each subband; And

Transmit described encoder feedback information to described base station.

13. method according to claim 12, wherein, described dicode Ben Geshi comprises the first matrix that represents described selecteed wave beam group and represents to be used for the second matrix of the described selecteed beam subset of each subband.

14. method according to claim 11, wherein, the described characteristic of described wave beam group set comprises one of the following at least: the number of the wave beam group in the number of the wave beam in each wave beam group of described wave beam group set, the set of described wave beam group and total angle domain of striding to the direction of the maximum array gain of last wave beam from the direction of the maximum array gain of the first wave beam in each wave beam group of described wave beam group set.

15. method according to claim 11, wherein, the direction of the maximum array of the first wave beam from described selecteed wave beam group gain is overlapping to the angular range of the direction of the maximum array gain of last wave beam to the direction of the maximum array gain of first wave beam of angular range in angle domain and from the adjacent beams group of the direction of the maximum array gain of last wave beam.

16. a device comprises:

Processor; And

Memory, described memory comprises computer program code;

Described memory and described computer program code are configured to, and utilize described processor to come so that described device is carried out at least:

Has the encoder feedback information of dicode Ben Geshi from the subscriber equipment reception, described encoder feedback information is identified selecteed wave beam group and is used for the selecteed beam subset of at least one subband, wherein, described selecteed wave beam group represents in the wave beam group set wave beam group conforming to broadband attribute by the channel condition information of described subscriber equipment measurement, and the characteristic of described wave beam group set is based on transmission rank, and wherein, in described selecteed wave beam group, select described selecteed beam subset according to described at least one subband, and the number of the wave beam in the described selecteed beam subset equals described transmission rank; And

Be formed for transmitting to described subscriber equipment the precoder of signal with described this form of dicode.

17. device according to claim 16, wherein, described dicode Ben Geshi comprises the first matrix that represents described selecteed wave beam group and represents to be used for the second matrix of the described selecteed beam subset of each subband.

18. device according to claim 17 wherein, adopts the row that obtain from discrete Fourier transform (DFT) matrix of over-sampling to gather to form described the first matrix.

19. device according to claim 16, wherein, the described characteristic of described wave beam group set comprises one of the following at least: the number of the wave beam group in the number of the wave beam in each wave beam group of described wave beam group set, the set of described wave beam group and total angle domain of striding to the direction of the maximum array gain of last wave beam from the direction of the maximum array gain of the first wave beam in each wave beam group of described wave beam group set.

20. device according to claim 16, wherein, the direction of the maximum array of the first wave beam from described selecteed wave beam group gain is overlapping to the angular range of the direction of the maximum array gain of last wave beam to the direction of the maximum array gain of first wave beam of angular range in angle domain and from the adjacent beams group of the direction of the maximum array gain of last wave beam.

21. device according to claim 16, wherein, described selecteed wave beam group is characterised in that 8 transmitting antennas.

22. an equipment comprises:

Be used for receiving from subscriber equipment the device of the encoder feedback information with dicode Ben Geshi, described encoder feedback information is identified selecteed wave beam group and is used for the selecteed beam subset of at least one subband, wherein, described selecteed wave beam group represents in the wave beam group set wave beam group conforming to broadband attribute by the channel condition information of described subscriber equipment measurement, and the characteristic of described wave beam group set is based on transmission rank, and wherein, in described selecteed wave beam group, select described selecteed beam subset according to described at least one subband, and the number of the wave beam in the described selecteed beam subset equals described transmission rank; And

Be used for being formed for to the device of the precoder of described subscriber equipment transmission signal with described this form of dicode.

23. equipment according to claim 22, wherein, described dicode Ben Geshi comprises the first matrix that represents described selecteed wave beam group and represents to be used for the second matrix of the described selecteed beam subset of each subband.

24. a computer program comprises the program code that is stored in the computer-readable medium, described program code is configured to:

Has the encoder feedback information of dicode Ben Geshi from the subscriber equipment reception, described encoder feedback information is identified selecteed wave beam group and is used for the selecteed beam subset of at least one subband, wherein, described selecteed wave beam group represents in the wave beam group set wave beam group conforming to broadband attribute by the channel condition information of described subscriber equipment measurement, and the characteristic of described wave beam group set is based on transmission rank, and wherein, in described selecteed wave beam group, select described selecteed beam subset according to described at least one subband, and the number of the wave beam in the described selecteed beam subset equals described transmission rank; And

Be formed for transmitting to described subscriber equipment the precoder of signal with described this form of dicode.

25. computer program according to claim 24, wherein, described dicode Ben Geshi comprises the first matrix that represents described selecteed wave beam group and represents to be used for the second matrix of the described selecteed beam subset of each subband.

26. a method comprises:

Has the encoder feedback information of dicode Ben Geshi from the subscriber equipment reception, described encoder feedback information is identified selecteed wave beam group and is used for the selecteed beam subset of at least one subband, wherein, described selecteed wave beam group represents in the wave beam group set wave beam group conforming to broadband attribute by the channel condition information of described subscriber equipment measurement, and the characteristic of described wave beam group set is based on transmission rank, and wherein, in described selecteed wave beam group, select described selecteed beam subset according to described at least one subband, and the number of the wave beam in the described selecteed beam subset equals described transmission rank; And

Be formed for transmitting to described subscriber equipment the precoder of signal with described this form of dicode.

27. method according to claim 26, wherein, described dicode Ben Geshi comprises the first matrix that represents described selecteed wave beam group and represents to be used for the second matrix of the described selecteed beam subset of each subband.

28. method according to claim 27 wherein, adopts the row that obtain from discrete Fourier transform (DFT) matrix of over-sampling to gather to form described the first matrix.

29. method according to claim 26, wherein, the described characteristic of described wave beam group set comprises one of the following at least: the number of the wave beam group in the number of the wave beam in each wave beam group of described wave beam group set, the set of described wave beam group and total angle domain of striding to the direction of the maximum array gain of last wave beam from the direction of the maximum array gain of the first wave beam in each wave beam group of described wave beam group set.

30. method according to claim 26, wherein, the direction of the maximum array of the first wave beam from described selecteed wave beam group gain is overlapping to the angular range of the direction of the maximum array gain of last wave beam to the direction of the maximum array gain of first wave beam of angular range in angle domain and from the adjacent beams group of the direction of the maximum array gain of last wave beam.

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