WO2012171387A1 - 一种信道信息获取和反馈方法、***及装置 - Google Patents

一种信道信息获取和反馈方法、***及装置 Download PDF

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Publication number
WO2012171387A1
WO2012171387A1 PCT/CN2012/073064 CN2012073064W WO2012171387A1 WO 2012171387 A1 WO2012171387 A1 WO 2012171387A1 CN 2012073064 W CN2012073064 W CN 2012073064W WO 2012171387 A1 WO2012171387 A1 WO 2012171387A1
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Prior art keywords
transmission point
downlink channel
channel matrix
channel
receiving end
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PCT/CN2012/073064
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English (en)
French (fr)
Inventor
张然然
拉盖施
高秋彬
苏昕
彭莹
孙韶辉
Original Assignee
电信科学技术研究院
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Publication of WO2012171387A1 publication Critical patent/WO2012171387A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621Feedback content
    • H04B7/0626Channel coefficients, e.g. channel state information [CSI]

Definitions

  • the present invention relates to communication technologies, and in particular, to a channel information acquisition and feedback method, system and device. Background technique
  • LTE-A Long Term Evolution Advanced
  • CoMP Coordinated Multi-Point Transmission/Reception
  • RRHs distributed remote radio heads
  • ID independent cell identifier
  • ID the cell identifier
  • the terminal can be provided with a communication service with a high shield. Since the data of all RRHs in a cell are processed centrally by the baseband processing unit, this brings about the possibility of efficient cooperation between RRHs. Therefore, distributed RRH is also an important scenario for CoMP technology applications.
  • a transmission point in a CoMP transmission To achieve joint processing of CoMP transmissions, it is necessary to know the joint channel of each coordinated transmission point to the user.
  • an uplink channel can be measured by a Sounding Reference Signal (SRS), and a channel can be obtained by using channel reciprocity. This not only saves feedback overhead on the downlink channel, but also avoids quantization and feedback errors in the feedback process.
  • SRS Sounding Reference Signal
  • the base station side can use the channel reciprocity and obtain the downlink channel information through the uplink SRS measurement.
  • the pilot is measured by the uplink. There is only one complex difference between the obtained transmission point 1 and the uplink channel H and the downlink channel ⁇ between the users, and the modulus is approximately 1 . Similarly, the uplink channel and the downlink between the transmission point 2 and the user obtained by the uplink measurement pilot are obtained.
  • the mismatch of the transmitting and receiving circuits will result in the reciprocity of the uplink and downlink channels not strictly established. As a result, the downlink channel estimation is inaccurate.
  • the calibration between the antennas in each transmission point can be achieved by self-calibration, etc., and the antenna calibration between the transmission points requires signaling interaction and/or standardization.
  • the antenna calibration between transmission points cannot be supported. , then. If the joint channel of the uplink measurement is directly used to estimate the downlink joint channel [Hi 1 " H "],
  • the embodiment of the invention provides a method, a system and a device for acquiring and feeding channel information, so as to improve the accuracy of the downlink channel acquired by the transmitting end.
  • a channel information acquisition method includes:
  • the reciprocal relationship is determined according to the uplink channel parameters of each transmission point and the downlink channel information fed back by the receiving end.
  • a channel information feedback method includes:
  • a channel information acquiring apparatus includes:
  • Obtaining a unit configured to obtain channel parameters of an uplink channel of the receiving end to each transmission point, and determine an uplink channel matrix of the receiving end to each transmission point;
  • a channel information acquiring unit configured to: according to an uplink channel matrix of each transmission point and the determined each transmission point a reciprocal relationship between the row channel and the uplink channel, determining a joint downlink channel matrix of each transmission point, and a reciprocal relationship between the downlink channel and the uplink channel of each transmission point according to an uplink channel parameter and a receiving end of each transmission point The feedback downlink channel information is determined.
  • a channel information feedback device includes:
  • a determining unit configured to determine a downlink channel matrix or a joint downlink channel matrix of each transmission point
  • a feedback unit configured to feed back downlink channel information according to the downlink channel matrix or the joint downlink channel matrix of each transmission point.
  • the invention provides a channel information acquisition and feedback method, system and device.
  • a small amount of channel information is fed back by the receiving end, and the channel reciprocity and the received
  • the channel information determines a joint channel of the plurality of transmission points, and the reciprocal relationship between the downlink channel and the uplink channel of each transmission point is determined according to the feedback information, and the downlink channel is determined according to the reciprocity relationship, thereby improving The accuracy of the downlink channel acquired by the sender.
  • FIG. 1 is a schematic diagram of a multiple transmission point channel in an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for acquiring channel information according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a channel information feedback method according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a channel information acquiring system according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a channel information acquiring apparatus according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of a channel information feedback apparatus according to an embodiment of the present invention. Detailed ways
  • the invention provides a channel information acquisition and feedback method, system and device.
  • a small amount of channel information is fed back by the receiving end, and the channel reciprocity and the received
  • the channel information determines a joint channel of the plurality of transmission points, and the reciprocal relationship between the downlink channel and the uplink channel of each transmission point is determined according to the feedback information, and the downlink channel is determined according to the reciprocity relationship, thereby improving The accuracy of the downlink channel acquired by the sender.
  • the method for acquiring channel information includes:
  • Step S201 Determine, according to the obtained channel parameter of the uplink channel of the receiving end to each transmission point, an uplink channel matrix of the receiving end to each transmission point;
  • Step S202 Determine, according to a reciprocal relationship between the uplink channel matrix of each transmission point and the determined downlink channel and the uplink channel of each transmission point, a joint downlink channel matrix of each transmission point, where the downlink channel and the uplink of each transmission point
  • the reciprocal relationship between channels is based on the uplink channel parameters of each transmission point and the downlink channel fed back by the receiving end. Information is determined.
  • the reciprocal relationship between the uplink channels can determine the joint downlink channel matrix of each transmission point according to the uplink channel matrix and the reciprocity relationship of each transmission point, so the accuracy of the downlink channel acquired by the transmitting end is improved.
  • the device performing channel acquisition may be based on the already identified downlink channel and A reciprocal relationship between the upstream channels and an uplink channel matrix of each transmission point to determine a joint downlink channel matrix for each transmission point.
  • the device for performing channel information acquisition may be one of the transmission points, that is, a preset central transmission point, or may be another node such as an evolved base station (e-NodeB, e B ), as long as the node and each transmission point are between It is more convenient to carry out data interaction.
  • e-NodeB evolved base station
  • the device for performing channel information acquisition that is, the transmitting end needs to first determine the downlink channel information fed back by the receiving end and the uplink channel matrix or each transmission of each transmission point before determining the reciprocal relationship between the downlink channel and the uplink channel of each transmission point.
  • the joint uplink channel matrix of the points, and then the joint downlink channel matrix of each transmission point is determined according to the uplink channel matrix of each transmission point and the reciprocal relationship.
  • the preset central transmission point needs to determine the downlink channel information fed back by the receiving end, and the uplink channel matrix of each transmission point or the joint uplink of each transmission point.
  • the uplink channel matrix of each transmission point or the joint uplink channel matrix of each transmission point may be sent by the other transmission points to the preset central transmission point, and the downlink channel information fed back by the receiving end may be All the downlink channel information is directly fed back to the preset central transmission point by the receiving end, and the downlink channel information corresponding to each transmission point is respectively fed back to the preset central transmission point and other transmission points by the receiving end.
  • the other transmission point forwards the downlink channel information fed back by the receiving end to a preset central transmission point.
  • the preset non-transmission point node needs to determine the downlink channel information fed back by the receiving end and the uplink channel matrix of each transmission point or the joint uplink channel of each transmission point. matrix.
  • the uplink channel matrix of each transmission point or the joint uplink channel matrix of each transmission point may be sent by each transmission point to the preset non-transmission point node, and the downlink channel information fed back by the receiving end may be All the downlink channel information is directly fed back to a transmission point by the receiving end, and then forwarded to the preset non-transmission point node by the transmission point, or the receiving end may respectively feed back the downlink channel information corresponding to each transmission point to multiple Transmission point, after receiving the downlink channel information fed back by the receiving end, the transmission point feedbacks the downlink of the receiving end
  • the channel information is forwarded to a preset non-transmission point node.
  • all the downlink channel information can be directly fed back to the preset non-transmission point node by the receiving end.
  • the receiving end feeds back the downlink channel information, it can actively perform feedback at the timing, or can perform feedback under the trigger of the transmitting end.
  • the downlink channel information fed back by the receiving end may be such that the transmitting end determines the reciprocal relationship between the downlink channel and the uplink channel, and may be at least one element in the downlink channel matrix corresponding to the corresponding transmission point determined by each transmission point, Or at least one channel ratio determined corresponding to each transmission point except the set transmission point, where the channel ratio determined by the corresponding one of the transmission points is: the setting element in the downlink channel matrix of the transmission point is not
  • the transmission point directly or indirectly determines the ratio of the set elements in the downlink channel matrix of the transmission point of the ratio relationship, and may also feed back the channel ratio corresponding to the transmission point for the part of the transmission point, and feed back the downlink channel matrix of the transmission point for other transmission points. At least one element in .
  • the transmitting end determines the reciprocal relationship between the downlink channel and the uplink channel by using the at least N elements.
  • the receiving end has NR receiving antennas, and the joint channel of N transmission points needs to be measured.
  • the nth transmission point has ⁇ ⁇ "root transmission day, then the receiving end can measure the downlink joint channel according to the downlink pilot, and downlink.
  • Joint channel can be expressed as Dimension complex matrix H D
  • H DL a L ... ].
  • the transmitting end uses the uplink pilot to measure the uplink channel from the receiving end to each transmission point, which is expressed as
  • m is an arbitrary integer from 1 to N, that is, the reciprocal relationship between each uplink channel matrix and the 2 3 ⁇ 4 downlink channel matrix is determined by using the uplink channel matrix of the mth transmission point and the downlink channel matrix as a ratio reference.
  • the transmitting end can determine:
  • the transmitting end determines the reciprocal relationship between the downlink channel and the uplink channel by using each channel ratio.
  • the proportional relationship between them can be, so that the sender can be based on Determine the joint downlink channel.
  • the receiving end determines at least one channel ratio corresponding to each transmission point except the set transmission point and feeds back, the total feedback is at least N-1 channel ratios, and the channel ratio fed back by the transmitting end is: ⁇ , and " ⁇ ;
  • k m ft '' d, / ⁇ ⁇ i, '",N; ⁇ , the value of each transmission point value ⁇ z" values are set in advance, usually, for convenience of calculation, it is necessary to be m Pre-set, if the m value is not set, when selecting the m value, it is necessary to make m a transmission point number that does not directly or indirectly determine the ratio relationship with the transmission point n to ensure the validity of the feedback channel ratio.
  • n takes values other than m in 1 ⁇ N, which can be obtained by this formula.
  • the value determines the reciprocal relationship between the downlink channel and the uplink channel.
  • the joint downlink channel matrix of each transmission point can be determined according to the following formula:
  • is the uplink channel matrix of the nth transmission point, which is a constant, indicating the difference between the uplink and downlink channels of the mth transmission point.
  • the downlink channel can be obtained by using the uplink channel as follows:
  • the receiving end can also feed back the channel ratio for some transmission points, and feed back the elements in the downlink channel matrix for another part of the transmission point.
  • the downlink channel information that is fed back is sufficient and effective, a person skilled in the art can obtain, by mathematical calculation, the channel ratio and/or the elements in the downlink channel matrix by using the method provided by the embodiment of the present invention.
  • the ratio between the two determines the joint downlink channel matrix.
  • the feedback downlink channel information includes at least one element in the downlink channel matrix of the corresponding transmission point and/or a set channel in the downlink channel matrix of the corresponding transmission point and a downlink channel matrix in the non-set transmission point.
  • the joint downlink channel matrix of each transmission point can be determined as follows:
  • the transmitting end knows at least N-1 effective channel ratios, and the joint downlink channel matrix H DL of each transmission point can be determined according to the following formula:
  • N is the number of transmission points
  • is the N R XN ⁇ dimension upstream channel matrix from the receiving end to the nth transmission point
  • N R is the number of antennas at the receiving end
  • is N transmission points
  • the number of antennas at the nth transmission point, indicating the 1st column element of the kth row in the downlink channel matrix H ", 13 ⁇ 4 and ⁇ ⁇ are preset values
  • k n e ⁇ i, —, N B ⁇ , ⁇ ⁇ ⁇ 1, ⁇ , ⁇ , m is the number of the set transmission point
  • the channel information acquisition method may also be used.
  • the transmission point 1 is the serving cell of the user
  • the receiving matrix of the user is calculated as the dimension matrix based on the downlink channel H.
  • L is the number of data streams
  • ( ⁇ )" means conjugate transposition
  • the downlink equivalent channel is:
  • N is the downlink equivalent channel of each cell;
  • the row channel ⁇ calculates that the receiving matrix of the user is a dimensional matrix, and the equivalent channel obtained by the uplink channel is
  • the k n and l n are all pre-set, and the setting elements of each transmission point are also set at the transmitting end, so that when the terminal feeds back the element value or the channel ratio of the corresponding transmission point, only the sequential feedback A set of values is sufficient, and no feedback is needed for k n and l n , where ⁇ and ⁇ can be set by standard or by higher layer signaling.
  • the receiving end may quantize the element value or the channel ratio, and feedback the quantized value to facilitate feedback on the channel information, and further reduce the burden on the system caused by the feedback channel information.
  • the receiving end feeds back at least one element value, that is, feedbacks at least N element values, or for other transmission points except the set transmission point, the receiving end feeds back at least one channel ratio, that is, feedback at least N- 1 channel ratio.
  • the receiving end only feeds back N element values or N-1 channel ratios, the reciprocal relationship between the downlink channel and the uplink channel can be determined. If the system conditions permit, the receiving end can have more By feeding back several element values or channel ratios, the transmitting end can more accurately determine the reciprocal relationship between the downlink channel and the uplink channel, thereby further improving the accuracy of the downlink channel acquired by the transmitting end.
  • the embodiment of the present invention further provides a channel information feedback method, as shown in FIG. 3, including:
  • Step S301 Determine a downlink channel matrix or a joint downlink channel matrix of each transmission point.
  • Step S302 Feed back downlink channel information according to a downlink channel matrix or a joint downlink channel matrix of each transmission point.
  • the receiving end may obtain a downlink channel matrix of each transmission point or a joint downlink channel matrix by using downlink pilots.
  • the receiving end can actively feed back the downlink channel information, and can also feed back the downlink channel information after being triggered by the transmitting end, thereby further reducing the feedback amount of the receiving end and reducing the burden on the system.
  • the receiving end may feed back the feedback downlink channel information to a preset central transmission point, or may feed back the downlink channel information corresponding to each transmission point to each transmission point respectively, when the channel is performed by a preset non-transmission point node.
  • the receiving end may directly feed back the feedback downlink channel information to a preset non-transmission point node. Therefore, in step S302, the downlink channel information is fed back to the transmission point, specifically:
  • the downlink channel information is fed back to a preset non-transmission point node.
  • the receiving end feeds back the downlink channel information to the receiving end, and may feed back to the transmission point, corresponding to each transmission point, the determined at least one channel ratio and/or at least one element in the downlink channel matrix corresponding to the transmission point, or may be a transmission
  • the point feedback corresponds to each of the transmission points except the set transmission point, and the determined at least one channel ratio, wherein the channel ratio determined by the corresponding one of the transmission points is: the setting element in the downlink channel matrix of the transmission point is not
  • the transmission point directly or indirectly determines the ratio of the set elements in the downlink channel matrix of the transmission point of the ratio relationship.
  • the receiving end may feed back to the transmission point at least one element in the downlink channel matrix corresponding to each transmission point, that is, at least N element values, or may feed back each transmission point except the set transmission point, and determine at least A channel ratio, that is, at least N-1 channel ratios.
  • the receiving end may feed back at least one element of the downlink channel matrix to a part of the transmission points, and feedback at least one channel ratio to another part of the transmission points. At this time, at least feedback is also required. N values.
  • N is a number of transmission points "represents k n row downlink channel matrix H 1 of" column element, k n, and l n is a predetermined value, and k n ⁇ 1, -, N B ⁇ , l n 6 ⁇ 1, ⁇ ⁇ ⁇ , ⁇ , ⁇ for the first ⁇ transmission point N R xN ⁇ dimensional downlink channel matrix receiving end, N R is the number of antennas of the receiving end, ⁇ ⁇ is ⁇ transmission point of The number of antennas of n transmission points, m is a preset value, and m ⁇ l , ... , ⁇ ⁇
  • the embodiment of the present invention further provides a channel information acquiring apparatus, a channel information feedback apparatus, and a channel information acquiring system in a channel information acquiring system, and the principle of solving the problem and the channel information acquiring method by the devices
  • the channel information feedback is similar, so the implementation of these devices can be referred to the implementation of the method, and the repeated description will not be repeated.
  • the embodiment of the present invention further provides a channel information acquiring system, as shown in FIG. 4, including:
  • the receiving end 401 is configured to determine a downlink channel matrix or a joint downlink channel matrix of each transmission point, and feed back downlink channel information according to a downlink channel matrix or a joint downlink channel matrix of each transmission point.
  • the central node 402 is configured to obtain channel parameters of the uplink channel of the receiving end to each transmission point, determine an uplink channel matrix of the receiving end to each transmission point, and determine an uplink channel matrix of each transmission point and a determined downlink channel of each transmission point. Determining the reciprocal relationship between the uplink channels, determining a joint downlink channel matrix of each transmission point, wherein the reciprocal relationship between the downlink channel and the uplink channel of each transmission point is based on the uplink channel parameters of each transmission point and the downlink feedback of the receiving end Channel information is determined.
  • the central node 402 When the central node 402 needs to update the reciprocal relationship between the downlink channel and the uplink channel of each transmission point, the central node 402 is further configured to obtain downlink channel information fed back by the receiving end, and according to uplink channel parameters and reception of each transmission point. The downlink channel information fed back is used to determine a reciprocal relationship between the downlink channel and the uplink channel of each transmission point.
  • the central node 402 can be specifically:
  • a preset central transmission point or a preset non-transmission point node A preset central transmission point or a preset non-transmission point node.
  • the preset central transmission point is further configured to: receive channel parameters of an uplink channel sent by other transmission points, and determine an uplink channel matrix of each transmission point; The other transmission points are also used to send the channel parameters of the uplink channel to a preset transmission point.
  • the receiving end feeds back the downlink channel information to the transmission point
  • the downlink channel information corresponding to each transmission point is respectively fed back to each transmission point
  • the preset central transmission point is further used for: receiving the receiving end feedback sent by other transmission points.
  • other transmission points are further used to: after receiving the downlink channel information fed back by the receiving end, forward the downlink channel information fed back by the receiving end to a preset transmission point.
  • the downlink channel information fed back by the receiving end is concentrated into a preset central transmission point, and the joint downlink channel matrix of each transmission point is determined by a preset central transmission point.
  • the preset non-transmission point node is further used for:
  • each transmission point is used to send the channel parameter of the uplink channel to a preset non-transmission point node.
  • the transmission channel that receives the downlink channel information needs to forward the downlink channel information to the preset non-set
  • the transmission point node, at this time, the preset non-transport point node is also used for:
  • the transmission point is further configured to: after receiving the downlink channel information fed back by the receiving end, forward the downlink channel information fed back by the receiving end to the preset non-transmission point node.
  • the embodiment of the present invention further provides a channel information acquiring device, which may be specifically a preset central transmission point, or a preset non-transmission point node such as a base station. As shown in FIG. 5, the device includes:
  • the obtaining unit 501 is configured to obtain channel parameters of an uplink channel of the receiving end to each transmission point, and determine an uplink channel matrix of the receiving end to each transmission point;
  • the channel information acquiring unit 502 is configured to determine a joint downlink channel matrix of each transmission point according to an uplink channel matrix of each transmission point and a determined reciprocal relationship between the downlink channel and the uplink channel of each transmission point, where each transmission point The reciprocal relationship between the downlink channel and the uplink channel is based on the uplink channel parameters and reception of each transmission point.
  • the downlink channel information of the end feedback is determined.
  • the obtaining unit 501 is further configured to:
  • the downlink channel information fed back by the receiving end is obtained, and the reciprocal relationship between the downlink channel and the uplink channel of each transmission point is determined according to the uplink channel parameter of each transmission point and the downlink channel information fed back by the receiving end.
  • the obtaining unit 501 is specifically configured to:
  • the channel parameters of the uplink channel sent by other transmission points are received, and the uplink channel matrix of the receiving end to each transmission point is determined.
  • the obtaining unit 501 is further configured to:
  • the obtaining unit 501 is specifically configured to:
  • the channel parameters of the uplink channel transmitted by each transmission point are received, and the uplink channel matrix of each receiving end to the transmission point is determined.
  • the 501 is further configured to: receive downlink channel information fed back by the receiving end sent by each transmission point.
  • the embodiment of the present invention further provides a channel information feedback device, which may be specifically a receiving end such as a user terminal, or may be another receiving end node. As shown in FIG. 6, the device includes:
  • the determining unit 601 is configured to determine a downlink channel matrix or a joint downlink channel matrix of each transmission point.
  • the feedback unit 602 is configured to feed back downlink channel information according to a downlink channel matrix or a joint downlink channel matrix of each transmission point.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can be embodied in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.
  • computer-usable storage interfaces including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本申请公开了一种信道信息获取和反馈方法、***及装置,涉及通信技术,在多个传输点间未进行天线校准的情况下,由接收端反馈少量的信道信息,同时利用信道互易性以及所接收到的信道信息确定多个传输点的联合信道,由于根据所反馈的信息确定出了每个传输点的下行信道和上行信道之间的互易关系,再根据该互易关系确定下行信道,从而提高了发送端获取的下行信道的准确性。

Description

一种信道信息获取和反馈方法、 ***及装置 本申请要求在 2011年 6月 17日提交中国专利局、 申请号为 201110164364.X、 发明名 称为"一种信道信息获取和反馈方法、 ***及装置"的中国专利申请的优先权, 其全部内容 通过引用结合在本申请中。
技术领域
本发明涉及通信技术, 尤其涉及一种信道信息获取和反馈方法、 ***及装置。 背景技术
后续长期演进 ( Long Term Evolution Advanced, LTE-A )釆用同频组网, 在大幅度提 高频谱利用率的同时, 也会造成小区边缘的用户信号衰落严重, 同时受到较高的来自其他 小区的千扰, 若不对信号衰落和千扰问题加以处理, 将会严重影响边缘用户的体验。 多点 协作协作多点发送 /接收 ( Coordinated Multi-Point Transmission/Reception, CoMP )技术通 过引入多小区之间的信息交互和联合传输, 不仅可以提高信号盾量也可以降低小区间千 扰, 从而可以大幅度提高小区边缘用户的数据传输性能。
为了提高对热点地区的覆盖同时节约网络成本, 不少运营商和设备商希望引入分布式 远端无线头 ( Remote Radio Head, RRH )。 RRH分散在一个小区内部, 一个 RRH可以有 自己独立的小区标识符(Identification, ID ), 也可以和其他 RRH或宏基站从属于同一' J、 区。 由于距离终端用户的距离较小, 可以给终端提供盾量较高的通信服务。 由于一个小区 内所有 RRH的数据都由基带处理单元集中处理,这就给 RRH之间的高效协作带来了可能, 因此分布式 RRH也是 CoMP技术应用的重要场景。
无论是多小区中的各个小区, 或者是分布式 RRH场景中的一个 RRH, 都可以看作是
CoMP传输中的一个传输点。 要实现联合处理的 CoMP传输, 都需要知道各协作传输点到 用户的联合信道。
在时分双工(Time Division Duplex, TDD )***中, 可以通过探测参考信号(Sounding Reference Signal, SRS ) 来测量上行信道, 并利用信道互易性, 获得下行信道。 这样不仅 节省了对下行信道的反馈开销, 还避免了反馈过程中的量化和反馈误差。
具体的, 在 TDD ***各传输点内天线间理想校准, 和各传输点间理想天线校准的情 况下, 基站端可以利用信道互易性以及通过上行 SRS测量得到下行信道信息。
如图 1所示,要实现传输点 1和传输点 2 的 CoMP传输, 需要知道传输点 1和传输点
2 到用户的联合信道 [ Η^]。 若各传输点内天线间已经得到校准, 通过上行测量导频 得到的传输点 1和用户间的上行信道 H 与下行信道 Η 之间只存在一个模值近似为 1的复 数差异, 同样, 通过上行测量导频得到的传输点 2和用户间的上行信道 与下行信道 之间也是只存在一个模值近似为 1 的复数差异, 即, 《 = ^^,《2¾^ = H ; 若各传输点 间也实现理想天线校准, 则 = «2 = « , 则上行测量所得到的联合信道 [H 与下行联 厂 DL 1 厂 UL ~1 _ ^厂 DL 1
合信道 LHi 」只存在一个复数差异, 即: LH' 」 = «LH' H2 」。 此时, 信道互易 性成立, 即使 α未知, 也可以通过上行测量获得下行的联合信道。
但是, 若未对发射电路和接收电路的天线进行校准, 收发电路的不匹配会导致上下行 信道互易性并不严格成立。 从而导致下行信道估计不准确。
而在实际***中, 各传输点内天线间的校准可以通过自校准等方法实现, 而各传输点 间的天线校准则需要信令交互和 /或标准化, 目前尚无法支持传输点间的天线校准, 那么 。 若直接利用上行测量的联合信道 来估计下行联合信道 [Hi1" H"] , 由于
[H' L H" ] = ["iHi L ¾Η"] , 信道互异性不成立, 若不考虑各 α之间的差异, 则会造成信 道信息的估计错误, 从而影响 CoMP性能。 发明内容
本发明实施例提供一种信道信息获取和反馈方法、 ***及装置, 以提高发送端获取的 下行信道的准确性。
一种信道信息获取方法, 包括:
获得接收端到各传输点的上行信道的信道参数 , 确定接收端到各个传输点的上行信道 矩阵;
根据各个传输点的上行信道矩阵以及确定的各个传输点的下行信道与上行信道之间 的互易关系, 确定各个传输点的联合下行信道矩阵, 所述各个传输点的下行信道与上行信 道之间的互易关系根据各个传输点的上行信道参数和接收端反馈的下行信道信息确定。
一种信道信息反馈方法, 包括:
确定各个传输点的下行信道矩阵或联合下行信道矩阵;
根据所述各个传输点的下行信道矩阵或联合下行信道矩阵, 反馈下行信道信息。 一种信道信息获取装置, 包括:
获得单元, 用于获得接收端到各传输点的上行信道的信道参数 , 确定接收端到各个传 输点的上行信道矩阵;
信道信息获取单元, 用于根据各个传输点的上行信道矩阵以及确定的各个传输点的下 行信道与上行信道之间的互易关系, 确定各个传输点的联合下行信道矩阵, 所述各个传输 点的下行信道与上行信道之间的互易关系根据各个传输点的上行信道参数和接收端反馈 的下行信道信息确定。
一种信道信息反馈装置, 包括:
确定单元, 用于确定各个传输点的下行信道矩阵或联合下行信道矩阵;
反馈单元, 用于根据所述各个传输点的下行信道矩阵或联合下行信道矩阵, 反馈下行 信道信息。
本发明提供一种信道信息获取和反馈方法、 ***及装置, 在多个传输点间未进行天线 校准的情况下, 由接收端反馈少量的信道信息, 同时利用信道互易性以及所接收到的信道 信息确定多个传输点的联合信道, 由于根据所反馈的信息确定出了每个传输点的下行信道 和上行信道之间的互易关系, 再根据该互易关系确定下行信道, 从而提高了发送端获取的 下行信道的准确性。 附图说明
图 1为本发明实施例中的多传输点信道示意图;
图 2为本发明实施例提供的信道信息获取方法流程图;
图 3为本发明实施例提供的信道信息反馈方法流程图;
图 4为本发明实施例提供的信道信息获取***结构示意图;
图 5为本发明实施例提供的信道信息获取装置结构示意图;
图 6为本发明实施例提供的信道信息反馈装置结构示意图。 具体实施方式
本发明提供一种信道信息获取和反馈方法、 ***及装置, 在多个传输点间未进行天线 校准的情况下, 由接收端反馈少量的信道信息, 同时利用信道互易性以及所接收到的信道 信息确定多个传输点的联合信道, 由于根据所反馈的信息确定出了每个传输点的下行信道 和上行信道之间的互易关系, 再根据该互易关系确定下行信道, 从而提高了发送端获取的 下行信道的准确性。
如图 2所示, 本发明实施例提供的信道信息获取方法包括:
步骤 S201、根据获得的接收端到各传输点的上行信道的信道参数, 确定接收端到各个 传输点的上行信道矩阵;
步骤 S202、根据各个传输点的上行信道矩阵以及确定的各个传输点的下行信道与上行 信道之间的互易关系, 确定各个传输点的联合下行信道矩阵, 其中, 各个传输点的下行信 道与上行信道之间的互易关系根据各个传输点的上行信道参数和接收端反馈的下行信道 信息确定。
由于仅需要接收端反馈能够确定各个传输点的下行信道与上行信道之间的互易关系 的少量下行信道信息, 所以不会给***带来过大的负担, 同时, 由于确知了下行信道与上 行信道之间的互易关系, 可以根据各个传输点的上行信道矩阵以及互易关系来确定各个传 输点的联合下行信道矩阵, 所以提高了发送端获取的下行信道的准确性。
在下行信道与上行信道之间的互易关系已经确知的情况下, 由于下行信道与上行信道 之间的互易关系变化较小, 所以进行信道获取的装置可以根据已经确知的下行信道与上行 信道之间的互易关系以及各个传输点的上行信道矩阵来确定各个传输点的联合下行信道 矩阵。
通常, 进行信道信息获取的装置可以为传输点之一, 即预先设定的中心传输点, 也可 以为演进基站(e-NodeB , e B )等其它节点, 只要该节点和各个传输点之间能够较方便的 进行数据交互即可。
进行信道信息获取的装置, 即发送端在确定各个传输点的下行信道与上行信道之间的 互易关系前, 需要首先确定接收端反馈的下行信道信息以及各个传输点的上行信道矩阵或 各个传输点的联合上行信道矩阵, 进而根据各个传输点的上行信道矩阵以及互易关系, 确 定各个传输点的联合下行信道矩阵。
具体的, 当信道信息获取装置为预先设定的中心传输点时, 则预先设定的中心传输点 需要确定接收端反馈的下行信道信息以及各个传输点的上行信道矩阵或各个传输点的联 合上行信道矩阵。 其中, 各个传输点的上行信道矩阵或各个传输点的联合上行信道矩阵可 以由其它各传输点将各自的上行信道矩阵发送给该预先设定的中心传输点, 而接收端反馈 的下行信道信息可以由接收端直接将所有下行信道信息反馈给该预先设定的中心传输点, 也可以由接收端将对应各个传输点的下行信道信息分别反馈给该预先设定的中心传输点 和其它传输点, 其它传输点在接收到接收端反馈的下行信道信息后, 再将接收端反馈的下 行信道信息转发给预先设定的中心传输点。
当信道信息获取装置为预先设定的非传输点节点时, 则预先设定的非传输点节点需要 确定接收端反馈的下行信道信息以及各个传输点的上行信道矩阵或各个传输点的联合上 行信道矩阵。 其中, 各个传输点的上行信道矩阵或各个传输点的联合上行信道矩阵可以由 各传输点将各自的上行信道矩阵发送给该预先设定的非传输点节点, 而接收端反馈的下行 信道信息可以由接收端直接将所有下行信道信息反馈给一个传输点, 再由该传输点转发给 预先设定的非传输点节点, 也可以由接收端将对应各个传输点的下行信道信息分别反馈给 多个传输点, 这些传输点在接收到接收端反馈的下行信道信息后, 再将接收端反馈的下行 信道信息转发给预先设定的非传输点节点, 当然, 在允许的情况下, 还可以由接收端直接 将所有下行信道信息反馈给该预先设定的非传输点节点。
接收端反馈下行信道信息时, 可以主动定时进行反馈, 也可以在发送端的触发下进行 反馈。
接收端反馈的下行信道信息只要能够使得发送端确定下行信道与上行信道之间的互 易关系即可, 可以是对应每个传输点确定的对应该传输点的下行信道矩阵中的至少一个元 素, 也可以是对应除设定传输点外的每个传输点确定的至少一个信道比值, 其中, 对应一 个传输点确定的信道比值为: 该传输点的下行信道矩阵中的设定元素与未与该传输点直接 或间接确定比值关系的传输点的下行信道矩阵中的设定元素的比值, 还可以对于部分传输 点反馈对应该传输点的信道比值, 对于其它传输点反馈该传输点的下行信道矩阵中的至少 一个元素。
具体的, 接收端反馈对应每个传输点确定的对应该传输点的下行信道矩阵中的至少一 个元素时, 发送端通过该至少 N个元素确定下行信道与上行信道之间的互易关系。
假设接收端有 NR根接收天线,共需测量 N个传输点的联合信道,第 n个传输点有 Ντ"根 发送天 , 那么接收端根据下行导频, 可以测量得到下行联合信道, 下行联合信道可表示 为
Figure imgf000006_0001
维的复矩阵 HD
HDL = a L … ]. 其中, " = 1,'''^为^ "维复矩阵, 为第 n个传输点到该接收端的下行信道矩阵。 C = 1..,NJ = 1..,NrJ = 1,… 表示 ΗΓ的第 行第 j列元素。 发送端利用上行导频, 可以测量得到接收端到各传输点的上行信道, 表示为
H " = 1,''',N , 为^ < "维复矩阵, IC " = UJ = URJ = 1 --,N; , 表示 的第 行第 j列元素。 由于传输点内各天线已经完成校准, 下行信道 H 和上行信道 L之间近似满足 如下关系:
= αηΉ^,η = \,·-,Ν . 其中, " "为复数, 且为常数。 由于未完成各传输点间的天线校准, 当 η取不同值时,
«„,"=1,'",W中元素各不相等。 因此无法由上行信道矩阵直接得到联合下行信道矩阵。 所以, 只要接收端反馈的下行信道信息能够使得发送端确知 a"'n=u各个元素之间 的比例关系即可, 即确定了各个传输点的下行信道与上行信道之间的互易关系, 这样发送 a2
端就可以根据 确定联合下行信道。 若接收端对每个下行信道矩阵, 都至少反馈一个元素 ," = U , 共反馈至少 Ν个 信道元素时, 发送端可以确定: a HDL =
Figure imgf000007_0001
其中, m为 1~N中的任意整数, 即以第 m个传输点的上行信道矩阵和下行信道矩阵 为比值基准确定各上行信道矩阵和 2 ¾下行信道矩阵之间的互易关系。
当 m为 1时, 即使用第 1个传输点 ½ D为基准时, 则发送端可以确定:
DL h!V h. UL
Η
'k 由于 为常数,所以作为联合下行信道矩阵的系数,并不影响发送端确定该联合下行 信道的特性。
当接收端反馈对应除设定传输点外的每个传输点确定的至少一个信道比值时, 发送端 则通过各信道比值确定下行信道与上行信道之间的互易关系。
同样道理, 只要接收端反馈的下行信道信息能够使得发送端确知 ," = 1,…, w各个元素
H H
之间的比例关系即可, 这样发送端就可以根据
Figure imgf000007_0002
确定联合 下行信道。
若接收端对应除设定传输点外的每个传输点确定至少一个信道比值并反馈, 共反馈至 少 N-1个信道比值, 发送端反馈的信道比值为: δη , 且"≠ ;
Figure imgf000007_0003
其中, km ft ' ' d , /∞ {i, ' ",N;},每个传输值点的^ 值 z "值都是预先设定好的,通常, 为了计算方便,需要对 m进行预先设定,若未设定 m值, 则在选取 m值时, 需要使得 m为未与传输点 n直接或间接确定比值关系的传输点编号, 以确保所反馈的信道比值的有效性。
例如, 若存在 4个传输点, 确定第 1个传输点的信道比值时, 使用第 3个传输点建立 比值关系, 此时 n=l , m=3 , 在确定第 2个传输点的信道比值时, 使用第 1个传输点建立 比值关系, 此时 n=2, m=l, 则在确定 3个传输点的信道比值时, 由于已经确定第 1个传 输点和第 3个传输点的比值关系, 则不再使用第 1个传输点建立比值关系, 并且, 由于根 据第 1个传输点的信道比值和第 2个传输点的信道比值能够确定第 2个传输点和第 3个传 输点之间的比值关系, 所以也不再使用第 2个传输点建立比值关系, 即 n=3时, m≠l, m ≠2。
由于 = «„H ," = l,"',N, 所以可以确定:
UL,n
H h DL,
h UL,m a hDL'm a. 若 m为固定值, 则 n分别取 1~N中除 m外的其它值, 进而可以通过该式得到■ ^的
D
值, 确定了下行信道与上行信道之间的互易关系。
当 m值为预先设定的固定值时, 即可根据下式确定各个传输点的联合下行信道矩阵
DL
H
i UL,m i UL,m UL,m a HDL = H: H;
hUL' hUL'N 其中, Η 为第 n个传输点的上行信道矩阵, 为常数, 表示第 m个传输点上下行信 道的差异。
具体的, 当 m设定为 1时, 则所反馈的信道比值为: δ =
h DL,1 n = 2,···,Ν h Κλ,
UL,1 δ ,n = 2 --- N
进而可以确定: U ,1
因此可以得到:
Figure imgf000008_0001
可以按照如下方法利用上行信道得到下行信道:
Figure imgf000008_0002
当然, 接收端也可以对于部分传输点反馈信道比值, 对另一部分传输点反馈下行信道 矩阵中的元素, 总之所反馈信息能使发送端获得"《,"=1,'",W中两两之间的比值, 即可按照 下式利用上行信道矩阵得到联合下行信道矩阵:
Figure imgf000009_0001
只要所反馈的下行信道信息是足够且有效的, 本领域技术人员可以通过本发明实施例 提供的方法,通过数学计算通过信道比值和 /或下行信道矩阵中的元素获得 = …, 中两 两之间的比值, 进而确定出联合下行信道矩阵。
例如, 反馈的下行信道信息包括所述对应传输点的下行信道矩阵中的至少一个元素和 /或包括对应传输点的下行信道矩阵中的设定元素与非设定传输点的下行信道矩阵中的设 定元素的比值时, 可以通过如下方式确定各个传输点的联合下行信道矩阵:
首先根据对应传输点的下行信道矩阵中的至少一个元素和 /或根据各个对应传输点的 下行信道矩阵中的设定元素与非设定传输点的下行信道矩阵中的设定元素的比值, 确定各 个传输点与设定传输点的信道比值:
Πί;
Figure imgf000009_0002
这样,加上接收端直接反馈的信道比值,发送端就获知了至少 N-1个有效的信道比值, 即可根据下式确定各个传输点的联合下行信道矩阵 HDL:
i UL i UL i UL
a HDL km m nkm m jjUL JM
k-[ -[ J J 其中, N为传输点的数量, Η 为接收端到第 η个传输点的 NR XN^维上行信道矩阵, NR为接收端的天线数目, Λ^ 为 N个传输点中第 η个传输点的天线数目, 表示下 行信道矩阵 H" 中的第 kn行第 1„列元素, 1¾和 ιη为预先设定的值, 且 kne {i,—,NB} , ιη {1,···,Λ^} , m为设定传输点的编号, 且 m {l, ..., Ν}, 为常数, 表示第 m个传 输点上下行信道的差异。
对于单小区接收机处理的信道反馈, 同样可以使用本发明实施例提供的信道信息获取 方法, 例如: 传输点 1 为该用户的服务小区, 基于下行信道 H 计算得到该用户的接收矩 阵为 维矩阵
Figure imgf000009_0003
, 其中 L 表示数据流数, (·)"表示共轭转置, 下行等效信道为:
¾ =Ui Η , Heq _LHe 1 He¾2 - He N」, He„," = l,'",N为各小区下行等效信道; 基于上 行信道 ^^计算得到该用户的接收矩阵为 维矩阵 , 由上行信道得到的等效信道为
Η ¾ = U' Η , q _ LH 1 He¾2 … H N」, H „," = 1,'",N为各小区上行等效信道。 则上下 行等效信道间满足: H = H ," = 1,''',W。 因此, 在获知了上下行等效信道间的互易关系 后, 即可通过上行等效信道矩阵和上下行等效信道间的互易关系确定下行等效信道矩阵。 在接收端反馈元素值/ ¾ / "或反馈信道比值^ = ^ « = 1, ..., N且 W≠ 时, 其中
"'" Z
的 kn, ln都是预先设定好的, 在发送端也同样设定了每个传输点的设定元素, 这样, 终端 在反馈对应传输点的元素值或信道比值时, 只要顺序反馈一组数值即可, 不需要反馈 kn 和 ln, 其中, ^和^可以通过标准设定, 也可以通过高层信令设定。
接收端在反馈元素值或反馈信道比值时, 可以对元素值或信道比值进行量化, 在反馈 量化后的值, 以便于对信道信息进行反馈, 同时进一步减小了反馈信道信息对***造成的 负担。
当然, 对于每个传输点, 接收端反馈至少一个元素值, 即反馈至少 N个元素值, 或对 于除设定传输点外的其它传输点, 接收端反馈至少一个信道比值, 即反馈至少 N-1个信道 比值, 当接收端只反馈 N个元素值或 N-1个信道比值时, 就能够确定下行信道与上行信道 之间的互易关系, 在***条件允许的情况下, 接收端可以多反馈几个元素值或信道比值, 从而可以使得发送端更准确的确定出下行信道与上行信道之间的互易关系, 进而进一步提 高发送端获取的下行信道的准确性。
本发明实施例还相应的提供一种信道信息反馈方法, 如图 3所示, 包括:
步骤 S301、 确定各个传输点的下行信道矩阵或联合下行信道矩阵;
步骤 S302、根据各个传输点的下行信道矩阵或联合下行信道矩阵,反馈下行信道信息。 在步骤 S301 中, 接收端可以通过下行导频获得各个传输点的下行信道矩阵或联合下 行信道矩阵。
接收端可以主动定时反馈下行信道信息, 也可以在得到发送端的触发后反馈下行信道 信息, 从而进一步减少接收端的反馈量, 减轻***的负担。
接收端可以将反馈的下行信道信息反馈给一个预先设定的中心传输点, 也可以将对应 各传输点的下行信道信息分别反馈给各个传输点, 当由预先设定的非传输点节点进行信道 信息的获取时, 接收端也可以将反馈的下行信道信息直接反馈给预先设定的非传输点节 点。 所以, 在步骤 S302中, 向传输点反馈下行信道信息具体为:
向预先设定的中心传输点反馈下行信道信息; 或者 向每个传输点反馈对应该传输点的下行信道信息; 或者
向预先设定的非传输点节点反馈所述下行信道信息。
接收端向接收端反馈下行信道信息, 可以是向传输点反馈对应每个传输点, 确定的至 少一个信道比值和 /或对应该传输点的下行信道矩阵中的至少一个元素,也可以是向传输点 反馈对应除设定传输点外的每个传输点, 确定的至少一个信道比值, 其中, 对应一个传输 点确定的信道比值为: 该传输点的下行信道矩阵中的设定元素与未与该传输点直接或间接 确定比值关系的传输点的下行信道矩阵中的设定元素的比值。
即, 接收端可以向传输点反馈对应每个传输点的下行信道矩阵中的至少一个元素, 即 至少 N个元素值, 也可以反馈对应除设定传输点外的每个传输点, 确定的至少一个信道比 值, 即至少 N-1个信道比值, 当然, 也可以对一部分传输点反馈其下行信道矩阵中的至少 一个元素, 对另一部分传输点反馈至少一个信道比值, 此时, 也需要至少反馈 N个值。
具体的, 所反馈的信道比值具体为: = 1, -, Ν , 且"≠ W;
Figure imgf000011_0001
其中, N为传输点的数量, "表示下行信道矩阵 H 中的第 kn行第 1„列元素, kn 和 ln为预先设定的值, 且 kn {1,— , NB} , ln 6 {1, · · · , ^ } , Η 为第 η个传输点到接收 端的 NR xN^维下行信道矩阵, NR为接收端的天线数目, Λ^ 为 Ν个传输点中第 η个 传输点的天线数目, m为预先设定的值, 且 m { l , ... , Ν} ο
基于同一发明构思, 本发明实施例中还提供了一种信道信息获取***中的信道信息获 取装置、 信道信息反馈装置、 及信道信息获取***, 由于这些设备解决问题的原理与信道 信息获取方法和信道信息反馈相似, 因此这些设备的实施可以参见方法的实施, 重复之处 不再赘述。
本发明实施例还提供一种信道信息获取***, 如图 4所示, 包括:
接收端 401 , 用于确定各个传输点的下行信道矩阵或联合下行信道矩阵; 并根据各个 传输点的下行信道矩阵或联合下行信道矩阵, 反馈下行信道信息。
中心节点 402, 用于获得接收端到各传输点的上行信道的信道参数, 确定接收端到各 个传输点的上行信道矩阵; 根据各个传输点的上行信道矩阵以及确定的各个传输点的下行 信道与上行信道之间的互易关系, 确定各个传输点的联合下行信道矩阵, 其中, 各个传输 点的下行信道与上行信道之间的互易关系根据各个传输点的上行信道参数和接收端反馈 的下行信道信息确定。 在中心节点 402需要更新各个传输点的下行信道与上行信道之间的互易关系时, 中心 节点 402还用于, 获得接收端反馈的下行信道信息, 并根据各个传输点的上行信道参数和 接收端反馈的下行信道信息确定各个传输点的下行信道与上行信道之间的互易关系。
其中, 中心节点 402可以具体为:
预先设定的中心传输点或者预先设定的非传输点节点。
当中心节点 402为预先设定的中心传输点, 时, 该预先设定的中心传输点还用于: 接 收其它传输点发送的上行信道的信道参数, 确定各个传输点的上行信道矩阵; 此时, 其它 传输点还用于, 将上行信道的信道参数发送给预先设定的传输点。
当接收端向传输点反馈下行信道信息时, 是将对应各个传输点的下行信道信息分别反 馈给各传输点时, 预先设定的中心传输点还用于: 接收其它传输点发送的接收端反馈的下 行信道信息; 此时, 其它传输点还用于, 在接收到接收端反馈的下行信道信息后, 将接收 端反馈的下行信道信息转发给预先设定的传输点。 从而将接收端反馈的下行信道信息集中 到预先设定的中心传输点中, 由预先设定的中心传输点确定各个传输点的联合下行信道矩 阵。
当中心节点 402具体为预先设定的非传输点节点, 且未在预先设定的非传输点节点中 设置各个传输点的上行信道矩阵时, 该预先设定的非传输点节点还用于:
接收各个传输点发送的上行信道的信道参数,确定各个传输点的上行信道矩阵;此时, 各个传输点用于, 将上行信道的信道参数发送给预先设定的非传输点节点。
若接收端不直接将下行信道信息反馈给预先设定的非传输点节点, 而是反馈给传输 点, 则需要由接收到下行信道信息的传输点将该下行信道信息转发给预先设定的非传输点 节点, 此时, 该预先设定的非传输点节点还用于:
接收各传输点发送的接收端反馈的下行信道信息;
传输点还用于, 在接收到接收端反馈的下行信道信息后, 将接收端反馈的下行信道信 息转发给预先设定的非传输点节点。
本发明实施例还相应提供一种信道信息获取装置, 该装置可以具体为预先设定的中心 传输点, 或者基站等预先设定的非传输点节点, 如图 5所示, 该装置包括:
获得单元 501 , 用于获得接收端到各传输点的上行信道的信道参数, 确定接收端到各 个传输点的上行信道矩阵;
信道信息获取单元 502 , 用于根据各个传输点的上行信道矩阵以及确定的各个传输点 的下行信道与上行信道之间的互易关系, 确定各个传输点的联合下行信道矩阵, 其中, 各 个传输点的下行信道与上行信道之间的互易关系根据各个传输点的上行信道参数和接收 端反馈的下行信道信息确定。
当需要信道信息获取装置更新各个传输点的下行信道与上行信道之间的互易关系时, 获得单元 501还用于:
获得接收端反馈的下行信道信息, 并根据各个传输点的上行信道参数和接收端反馈的 下行信道信息确定各个传输点的下行信道与上行信道之间的互易关系。
当该装置具体为预先设定的中心传输点时, 获得单元 501具体用于:
接收其它传输点发送的上行信道的信道参数, 确定接收端到各个传输点的上行信道矩 阵。
当接收端向传输点反馈下行信道信息时, 是将对应各个传输点的下行信道信息分别反 馈给各传输点时, 预先设定的中心传输点中, 获得单元 501还用于:
接收其它传输点发送的接收端反馈的下行信道信息。
该装置具体为预先设定的非传输点节点时, 获得单元 501具体用于:
接收各传输点发送的上行信道的信道参数, 确定各个接收端到传输点的上行信道矩 阵。
当接收端向传输点反馈下行信道信息时, 是将下行信道信息反馈给传输点, 而不是反 馈给预先设定的非传输点节点, 此时, 预先设定的非传输点节点中, 获得单元 501还用于: 接收各传输点发送的接收端反馈的下行信道信息。
本发明实施例还相应提供一种信道信息反馈装置, 该装置可以具体为用户终端等接收 端, 也可以为其它接收端节点, 如图 6所示, 该装置包括:
确定单元 601 , 用于确定各个传输点的下行信道矩阵或联合下行信道矩阵; 反馈单元 602, 用于根据各个传输点的下行信道矩阵或联合下行信道矩阵, 反馈下行 信道信息。
本领域内的技术人员应明白, 本发明的实施例可提供为方法、 ***、 或计算机程序产 品。 因此, 本发明可釆用完全硬件实施例、 完全软件实施例、 或结合软件和硬件方面的实 施例的形式。 而且, 本发明可釆用在一个或多个其中包含有计算机可用程序代码的计算机 可用存储介盾 (包括但不限于磁盘存储器、 CD-ROM、 光学存储器等)上实施的计算机程 序产品的形式。
本发明是参照根据本发明实施例的方法、 设备(***)、 和计算机程序产品的流程图 和 /或方框图来描述的。 应理解可由计算机程序指令实现流程图和 /或方框图中的每一流 程和 /或方框、 以及流程图和 /或方框图中的流程和 /或方框的结合。 可提供这些计算机 程序指令到通用计算机、 专用计算机、 嵌入式处理机或其他可编程数据处理设备的处理器 以产生一个机器, 使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用 于实现在流程图一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的 装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方 式工作的计算机可读存储器中, 使得存储在该计算机可读存储器中的指令产生包括指令装 置的制造品, 该指令装置实现在流程图一个流程或多个流程和 /或方框图一个方框或多个 方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上, 使得在计算机 或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理, 从而在计算机或其他 可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和 /或方框图一个 方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例, 但本领域内的技术人员一旦得知了基本创造性概 念, 则可对这些实施例作出另外的变更和修改。 所以, 所附权利要求意欲解释为包括优选 实施例以及落入本发明范围的所有变更和修改。
显然, 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和 范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种信道信息获取方法, 其特征在于, 包括:
根据获得的接收端到各传输点的上行信道的信道参数, 确定接收端到各个传输点的上 行信道矩阵;
根据各个传输点的上行信道矩阵以及确定的各个传输点的下行信道与上行信道之间 的互易关系, 确定各个传输点的联合下行信道矩阵, 所述各个传输点的下行信道与上行信 道之间的互易关系根据各个传输点的上行信道参数和接收端反馈的下行信道信息确定。
2、 如权利要求 1 所述的方法, 其特征在于, 确定各个传输点的联合下行信道矩阵之 前, 还包括:
获得接收端反馈的下行信道信息, 并根据各个传输点的上行信道参数和接收端反馈的 下行信道信息确定各个传输点的下行信道与上行信道之间的互易关系。
3、 如权利要求 1或 2所述的方法, 其特征在于, 所述接收端反馈的下行信道信息, 具体包括:
对应每个传输点确定的至少一个信道比值和 /或对应该传输点的下行信道矩阵中的至 少一个元素, 所述对应一个传输点确定的信道比值为: 该传输点的下行信道矩阵中的设定 元素与未与该传输点直接或间接确定比值关系的传输点的下行信道矩阵中的设定元素的 比值; 或者
对应除设定传输点外的每个传输点确定的至少一个信道比值, 所述对应一个传输点确 定的信道比值为: 该传输点的下行信道矩阵中的设定元素与未与该传输点直接或间接确定 比值关系的传输点的下行信道矩阵中的设定元素的比值。
4、 如权利要求 3 所述的方法, 其特征在于, 所述信道比值具体为: 该传输点的下行 信道矩阵中的设定元素与设定传输点的下行信道矩阵中的设定元素的比值。
5、 如权利要求 4 所述的方法, 其特征在于, 当所述对应一个传输点确定的信道比值 为该传输点的下行信道矩阵中的设定元素与预先设定传输点的下行信道矩阵中的设定元 素的比值时, 所述对除预先设定的传输点外的每个传输点至少一个信道比值, 具体为:
r DL,n
nk l
δη = , η=1 , ... , N W≠W ;
Figure imgf000015_0001
其中, N为传输点的数量, ¾J "表示下行信道矩阵 H 中的第 kn行第 1„列元素, kn 和 ln为预先设定的值, 且 kn {1,— , NB } , ln 6 {1, · · · , ^ } , Η 为第 η个传输点到接收 端的 NR xN^维下行信道矩阵, NR为接收端的天线数目, Λ^ 为 N个传输点中第 η个 传输点的天线数目, m为所述设定传输点的编号, 且 m { 1 , ..., N}o
6、 如权利要求 5 所述的方法, 其特征在于, 确定各个传输点的联合下行信道矩阵, 具体包括:
根据下式确定各个传输点的联合下行信道矩阵 HDL:
7 UL,m
HDL = H
Figure imgf000016_0001
其中, Η 为接收端到第 η个传输点的 NR X Ντ维上行信道矩阵, ^为接收端的天 线数目, ^为 N个传输点中第 n个传输点的天线数目, m为所述设定传输点的编号, 且 m6 {1, ..., N}, ¾„为常数, 表示第 m个传输点上下行信道的差异。
7、 如权利要求 3 所述的方法, 其特征在于, 当所述接收端反馈的下行信道信息包括 所述对应传输点的下行信道矩阵中的至少一个元素和 /或包括对应传输点的下行信道矩阵 中的设定元素与非设定传输点的下行信道矩阵中的设定元素的比值时, 确定各个传输点的 联合下行信道矩阵, 具体包括:
根据对应传输点的下行信道矩阵中的至少一个元素和 /或根据各个对应传输点的下行 信道矩阵中的设定元素与非设定传输点的下行信道矩阵中的设定元素的比值, 确定各个传 输点与设定传输点的信道比值:
r DL,n
Sn = , n=l, N M≠W;
Figure imgf000016_0002
根据下式确定各个传输点的联合下行信道矩阵 HDL:
Figure imgf000016_0003
其中, N为传输点的数量, Η 为接收端到第 η个传输点的 NR XNT维上行信道矩阵, NR为接收端的天线数目, Λ^ 为 N个传输点中第 η个传输点的天线数目, 表示下 行信道矩阵 H" 中的第 kn行第 1„列元素, 1¾和 ιη为预先设定的值, 且 kne {ΐ,···,^} , ιη {1,···,Λ^} , m为所述设定传输点的编号, 且 m {l, ..., N}, (¾为常数, 表示第 m 个传输点上下行信道的差异。
8、 如权利要求 3 所述的方法, 其特征在于, 当所述接收端反馈的下行信道信息具体 为: 接收端反馈的对应该传输点的下行信道矩阵中的至少一个元素时, 确定各个传输, 联合下行信道矩阵, 具体包括:
根据下式确定各个传输点的联合下行信道矩阵 HDL:
Figure imgf000017_0001
其中, N为传输点的数量, Η 为接收端到第 η个传输点的 NR XN^维上行信道矩阵, NR为接收端的天线数目, Λ^ 为 N个传输点中第 η个传输点的天线数目, 表示下 行信道矩阵 H" 中的第 kn行第 1„列元素, 1¾和 ιη为预先设定的值, 且 kne {ΐ,···,^} , ιη {1,···,Λ^} , m为所述设定传输点的编号, 且 m {l, ..., N}, (¾为常数, 表示第 m 个传输点上下行信道的差异。
9、 一种信道信息反馈方法, 其特征在于, 包括:
确定各个传输点的下行信道矩阵或联合下行信道矩阵;
根据所述各个传输点的下行信道矩阵或联合下行信道矩阵, 反馈下行信道信息。
10、 如权利要求 9所述的方法, 其特征在于, 所述反馈下行信道信息, 包括: 反馈对应每个传输点确定的至少一个信道比值和 /或对应该传输点的下行信道矩阵中 的至少一个元素, 所述对应一个传输点确定的信道比值为: 该传输点的下行信道矩阵中的 设定元素与未与该传输点直接或间接确定比值关系的传输点的下行信道矩阵中的设定元 素的比值; 或者
反馈对应除设定传输点外的每个传输点确定的至少一个信道比值, 所述对应一个传输 点确定的信道比值为: 该传输点的下行信道矩阵中的设定元素与未与该传输点直接或间接 确定比值关系的传输点的下行信道矩阵中的设定元素的比值。
11、 如权利要求 10所述的方法, 其特征在于, 所述信道比值具体为: , 且"≠ W ;
Figure imgf000017_0002
其中, Ν为传输点的数量, "表示下行信道矩阵 Η 中的第 kn行第 1„列元素, kn 和 ln为预先设定的值, 且 kn {1,— ,NB} , ln6 {1,···,^ } , Η 为第 η个传输点到接收 端的 NR XN^维下行信道矩阵, NR为接收端的天线数目, Λ^ 为 Ν个传输点中第 η个 传输点的天线数目, m为预先设定的值, 且 m {l, ..., Ν}。
12、 如权利要求 9-11任一所述的方法, 其特征在于, 所述反馈下行信道信息具体为: 向预先设定的中心传输点反馈所述下行信道信息; 或者
向每个传输点反馈对应该传输点的下行信道信息; 或者
向预先设定的非传输点节点反馈所述下行信道信息。
13、 一种信道信息获取***, 其特征在于, 包括:
接收端, 用于确定各个传输点的下行信道矩阵或联合下行信道矩阵; 并根据所述各个 传输点的下行信道矩阵或联合下行信道矩阵, 反馈下行信道信息;
中心节点, 用于根据获得的接收端到各传输点的上行信道的信道参数, 确定接收端到 各个传输点的上行信道矩阵; 根据各个传输点的上行信道矩阵以及确定的各个传输点的下 行信道与上行信道之间的互易关系, 确定各个传输点的联合下行信道矩阵, 所述各个传输 点的下行信道与上行信道之间的互易关系根据各个传输点的上行信道参数和接收端反馈 的下行信道信息确定。
14、 一种信道信息获取装置, 其特征在于, 包括:
获得单元, 用于根据获得的接收端到各传输点的上行信道的信道参数, 确定接收端到 各个传输点的上行信道矩阵;
信道信息获取单元, 用于根据各个传输点的上行信道矩阵以及确定的各个传输点的下 行信道与上行信道之间的互易关系, 确定各个传输点的联合下行信道矩阵, 所述各个传输 点的下行信道与上行信道之间的互易关系根据各个传输点的上行信道参数和接收端反馈 的下行信道信息确定。
15、 如权利要求 14所述的装置, 其特征在于, 所述获得单元还用于:
获得接收端反馈的下行信道信息, 并根据各个传输点的上行信道参数和接收端反馈的 下行信道信息确定各个传输点的下行信道与上行信道之间的互易关系。
16、 一种信道信息反馈装置, 其特征在于, 包括:
确定单元, 用于确定各个传输点的下行信道矩阵或联合下行信道矩阵; 反馈单元, 用于根据所述各个传输点的下行信道矩阵或联合下行信道矩阵, 反馈下行 信道信息。
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