WO2010135924A1 - 通信装置、通信方法和基站 - Google Patents

通信装置、通信方法和基站 Download PDF

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Publication number
WO2010135924A1
WO2010135924A1 PCT/CN2010/070923 CN2010070923W WO2010135924A1 WO 2010135924 A1 WO2010135924 A1 WO 2010135924A1 CN 2010070923 W CN2010070923 W CN 2010070923W WO 2010135924 A1 WO2010135924 A1 WO 2010135924A1
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WO
WIPO (PCT)
Prior art keywords
terminal
base station
precoding matrix
communication device
output mode
Prior art date
Application number
PCT/CN2010/070923
Other languages
English (en)
French (fr)
Inventor
周华
田军
张�杰
Original Assignee
富士通株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 富士通株式会社 filed Critical 富士通株式会社
Priority to EP10780006A priority Critical patent/EP2437405A4/en
Priority to JP2012507579A priority patent/JP2012525739A/ja
Priority to CN2010800194115A priority patent/CN102415004A/zh
Publication of WO2010135924A1 publication Critical patent/WO2010135924A1/zh
Priority to US13/285,795 priority patent/US20120045018A1/en

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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
    • H04B7/0686Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • 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
    • H04B7/0413MIMO systems
    • H04B7/0426Power distribution
    • H04B7/0434Power distribution using multiple eigenmodes
    • 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
    • H04B7/0617Diversity 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 for beam forming
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025Transmission of mode-switching indication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006Arrangements for removing intersymbol interference
    • H04L25/03343Arrangements at the transmitter end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006Arrangements for removing intersymbol interference
    • H04L2025/0335Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03426Arrangements for removing intersymbol interference characterised by the type of transmission transmission using multiple-input and multiple-output channels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006Arrangements for removing intersymbol interference
    • H04L2025/03777Arrangements for removing intersymbol interference characterised by the signalling
    • H04L2025/03802Signalling on the reverse channel
    • H04L2025/03808Transmission of equaliser coefficients
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037Inter-user or inter-terminal allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044Arrangements for allocating sub-channels of the transmission path allocation of payload
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058Allocation criteria
    • H04L5/0064Rate requirement of the data, e.g. scalable bandwidth, data priority

Definitions

  • the present invention relates to communication systems, and in particular to communication systems employing MIMO technology. Background technique
  • the base station communicates with multiple terminals.
  • multiple transmitting antennas of the base station and receiving antennas of the terminal there are many multi-antenna technologies that can be used.
  • MIMO Multi-Input Multi-Output
  • MIMO technology can be divided into single-user MIMO (SU-MIMO) mode, multi-user MIMO (MU-MIMO) mode, and inter-base-station cooperative MIMO (Multiple Cell MIMO). ) mode.
  • SU-MIMO single-user MIMO
  • MU-MIMO multi-user MIMO
  • Inter-base-station cooperative MIMO Multiple Cell MIMO
  • W is the precoding matrix
  • s is the pre-transmission signal
  • X is the signal that is weighted and sent to the antenna.
  • H is the MIMO channel, if H and W are ideally matched, such that:
  • the receiver can easily demodulate s.
  • the terminal estimates the appropriate W by measuring the MIM0 channel H, and then feeds the sequence number of the W in the code book C to the base station. After obtaining the sequence number, the base station can check the code book C to obtain the weight matrix W that is really needed.
  • PMI Precoding Matrix Index
  • the terminal needs to feed back the necessary channel information (such as PMI). How to reduce the feedback overhead is a hot topic.
  • PMI channel information
  • the inventors of the present invention have found that since the processing of the terminal and the base station are different in various MIMO modes, unified PMI feedback cannot be performed. Summary of the invention
  • Embodiments of the present invention have been made in view of the above problems of the prior art to overcome one or more disadvantages of the prior art, and at least provide a beneficial alternative.
  • the present invention provides the following aspects.
  • a communication device having a plurality of antennas which may employ multiple input multiple output techniques, and the communication device includes:
  • a multiple input multiple output mode determining unit configured to determine a multiple input multiple output mode to be adopted
  • a precoding matrix information determining unit configured to determine a precoding matrix according to the determined multiple input multiple output mode
  • a sending unit transmitting information related to the precoding matrix
  • the precoding matrix information determining unit determines a precoding matrix to be used when a serving base station of a cell in which the communication device is located communicates with the communication device, and the serving base station and the communication device in the cell A precoding matrix that should be used when communicating with other communication devices.
  • the communication device characterized in that, when the multiple input multiple output mode to be used is a multi-base station cooperative multiple input multiple output mode, the precoding matrix information determining unit determines the serving base station and The precoding matrix to be used when the communication device performs communication and the precoding matrix to be used when the neighboring base station of the serving base station communicates with other communication devices in the neighboring cell and the communication device group.
  • Aspect 3 The communication device according to aspect 1, characterized in that, when the multiple input multiple output mode to be used is a single cell multi-user multiple input multiple output mode, the precoding matrix information determining unit is configured to cause the communication Determining, by the device, a quality-optimized criterion of a signal obtained from the serving base station, a precoding matrix to be used when the serving base station communicates with the communication device, based on a signal obtained by the communication device from the serving base station The worst quality criteria determine the precoding matrix that should be used by the serving base station to communicate with other communication devices in the cell that are grouped with the communication device.
  • Aspect 4 The communication device according to aspect 2, wherein, when the multiple input multiple output mode to be employed is a multi-base station cooperative multiple input multiple output mode, the precoding matrix information determining unit is configured to cause the communication device a quality-optimized criterion of a signal obtained from the serving base station determining a precoding matrix to be used when the serving base station communicates with the communication device, based on a signal obtained by the communication device from the neighboring base station The worst quality criterion determines the precoding matrix that should be used by neighboring base stations to communicate with other communication devices in the neighboring cell that are grouped with the communication device.
  • Aspect 5 The communication device according to aspect 1 or 2, wherein, when the multiple input multiple output mode to be used is a single user multiple input multiple output mode, the precoding matrix information determining unit is based on a capacity maximization principle Or minimizing the error rate principle to determine that the serving base station is in communication with the communication device Two or more precoding matrices that should be used in the letter.
  • Aspect 6 The communication apparatus according to aspect 1, wherein the information related to the precoding matrix is the precoding matrix itself or a precoding matrix index.
  • Aspect 7 The communication device according to aspect 1, wherein the transmitting unit transmits information related to the precoding matrix in various MIMO modes in a unified format.
  • a base station, the base station includes:
  • a multiple input multiple output mode determining unit configured to determine a multiple input multiple output mode to be employed;
  • a notification unit configured to notify the determined terminal of the determined multiple input multiple output mode;
  • a receiving unit configured to receive the Information about the precoding matrix of the terminal;
  • a terminal grouping unit configured to perform, according to the information about the precoding matrix sent by the terminal, when the determined multiple input multiple output mode is a single cell multiple user multiple input multiple output mode, group.
  • the terminal grouping unit comprises: a terminal priority determining unit, a same priority terminal grouping unit, a determining unit, a secondary priority terminal grouping unit, and a second Excellent group unit,
  • the terminal priority determining unit determines the priority of the terminal, and the same priority terminal grouping unit determines the terminal grouped with the terminal concerned in the terminal of the same priority, and the determining unit determines whether the group is found.
  • the terminal of the sub-priority terminal grouping unit searches for the terminal in the sub-priority terminal when the judging unit judges that the terminal that is not grouped with the terminal of interest is found in the terminal of the same priority.
  • the terminal group in which the terminal is concerned, the secondary priority grouping unit performs the sub-optimal grouping when the determining unit determines that the terminal grouped with the terminal of interest is not found in the terminal of the secondary priority.
  • a communication method for use in a communication device that accepts a service of a base station comprising: Determine the multiple input multiple output mode that should be used;
  • the multiple input multiple output mode to be used is a single cell multiple user multiple input multiple output mode
  • determining a precoding matrix to be used when the serving base station of the cell in which the communication device is located communicates with the communication device, and the A precoding matrix to be used by the serving base station when communicating with other communication devices in the cell that are grouped with the communication device.
  • a base station, the base station includes:
  • a receiving unit configured to receive information about a precoding matrix from another base station
  • a terminal grouping unit for performing grouping between the terminals according to the information related to the precoding matrix.
  • a multiple input multiple output mode determining unit configured to determine a multiple input multiple output mode to be adopted
  • a precoding matrix information determining unit configured to determine a precoding matrix according to the determined multiple input multiple output mode
  • a sending unit transmitting information related to the precoding matrix
  • the precoding matrix information determining unit determines a plurality of precoding matrices associated with the multiple input multiple output mode determined by the multiple input multiple output mode determining unit, and is determined by the multiple input multiple output mode determining unit. In the multiple input multiple output mode, the transmitting unit transmits the information related to the plurality of precoding matrices in the same message format.
  • Aspect 13 The communication device according to aspect 12, wherein, when the multiple input multiple output mode to be used is a single cell multiple user multiple input multiple output mode, the precoding matrix information determining unit determines a precoding matrix to be used when the serving base station of the cell in which the communication device is located communicates with the communication device, and a communication base station to use when communicating with other communication devices in the cell that are grouped with the communication device Precoding matrix.
  • Aspect 14 The communication device according to aspect 12, wherein, when the multiple input multiple output mode to be employed is a multi-base station cooperative multiple input multiple output mode, the precoding matrix information determining unit determines the serving base station and the A precoding matrix to be used when the communication device communicates and a precoding matrix to be used when the neighboring base station of the serving base station communicates with other communication devices in the neighboring cell that are grouped with the communication device.
  • Aspect 15 The communication device according to aspect 12, wherein the precoding matrix information determining unit is based on a capacity maximization principle or minimizing an error when the multiple input multiple output mode to be employed is a single user multiple input multiple output mode
  • the rate principle determines two or more precoding matrices that the serving base station should use when communicating with the communication device.
  • a multiple input multiple output mode determining unit configured to determine a multiple input multiple output mode to be adopted
  • a precoding matrix information determining unit configured to determine a precoding matrix according to the determined multiple input multiple output mode
  • a sending unit transmitting information related to the precoding matrix
  • the precoding matrix information determining unit determines a precoding matrix to be used when the serving base station communicates with the communication device, and the A precoding matrix to be used when a neighboring base station of the serving base station communicates with other communication devices in the neighboring cell that are grouped with the communication device.
  • unified feedback signaling can be designed, which can simplify the location at the terminal Reason.
  • the terminal feeds back multiple (including two) PMI information regardless of the multiple input multiple output mode, so that the base station can more conveniently control the inter-user interference when scheduling multiple users.
  • FIG. 1 schematically shows the processing of a communication system in accordance with an embodiment of the present invention in a SU-MIMO mode
  • FIG. 2 schematically illustrates processing of a communication system in accordance with an embodiment of the present invention in a MU-MIMO mode
  • Figure 3 is a diagrammatic view showing the processing of a communication system in accordance with an embodiment of the present invention in an inter-base station cooperative MIMO mode;
  • FIG. 4 is a schematic illustration of the principle of pairing terminals in accordance with an embodiment of the present invention
  • FIG. 5 is a view schematically showing an embodiment of a structure of a terminal according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram showing an embodiment of a structure of a base station according to an embodiment of the present invention
  • FIG. 7 is a diagram showing another embodiment of the present invention, in which two terminals are paired as an example, a terminal group unit Processing performed;
  • FIG. 8 is a schematic structural diagram of a terminal grouping unit 64 of a base station according to the above embodiment.
  • FIG. 9 is a diagram showing the structure of a neighboring base station according to an embodiment of the present invention. detailed description
  • Fig. 1 schematically shows the processing of a communication system in accordance with an embodiment of the present invention in a SU-MIMO mode.
  • a base station transmits multiple signals to a user using the same physical resources.
  • the base station needs to perform matrix weighting on the multiple signals when transmitting them.
  • the weighting matrix is a code matrix in a codebook known to the base station and the terminal.
  • a terminal feeds back two or more PMIs, one for each data stream, in which case the precoding matrix is reduced to a precoding vector.
  • the principle of selection may be the principle of capacity maximization or the principle of minimizing the error rate.
  • the base station weights the transmitted data stream based on the fed back PMI.
  • Fig. 2 schematically shows the processing of a communication system in accordance with an embodiment of the present invention in a MU-MIMO mode.
  • a base station transmits signals to multiple users using the same physical resources.
  • the base station needs to use the PMI pairing (grouping) method.
  • each terminal feeds back two or more PMIs (two PMIs are shown in the figure), wherein one PMI is used by the terminal for feedback, and the other is desired.
  • the PMI is for users who are required to pair with the terminal. Although only two terminals are shown in the figure, it should be noted that there may be more terminals.
  • the PMI selection can be performed using the following formula:
  • H k is the MIMO channel matrix from base station to user k
  • w is the codeword in the codebook
  • its index in the codebook is abbreviated as PMI
  • PMI1 is the largest SNR
  • PMI2 is the smallest SNR
  • Fig. 4 schematically illustrates the principle of pairing terminals in accordance with an embodiment of the present invention.
  • user N feeds back two PMIs, it corresponds to the best SNR and the worst SNR, respectively, the best SNR is the best PMI, and the worst SNR is called the worst PMI.
  • PMI1 X
  • the worst PMI2 Y
  • another user also feeds back two PMIs, preferably PMI 1 is Y, and the worst ⁇ 2 is X, then the two users are just paired, and the user's best ⁇ corresponds to the user. ⁇ The worst, the worst of the user, the best choice for the user.
  • the terminal priority can be matched according to the terminal priority, for example, if terminal 1 priority Whether the PMI1 used by the terminal 1 is the PMI 4 required by the terminal 2 is not specified, as shown in FIG. 2. If there are more than two PMIs, the PMIs other than PMI1 are removed. The PMIs that the terminal wants to be grouped with should be used. The terminals in the group can be multi-water.
  • Fig. 3 schematically shows the processing of a communication system in accordance with an embodiment of the present invention in an inter-base station cooperative MIMO mode.
  • each water-sending terminal feeds back two or more ⁇ , where one ⁇ (for example, PMI1) is a base station (also called a cell base station or a serving base station) of a cell (serving cell) where the terminal wants the terminal to be located.
  • for example, PMI1
  • a precoding matrix used to weight the messages sent to itself.
  • Other ⁇ eg ⁇ 2
  • the terminal can make a selection according to the following formula:
  • H is the MIMO channel matrix from the serving base station to the user k
  • H 2 k is the MIMO channel from the neighboring base station to the user k
  • w ⁇ nw 2 is the best PMI of the serving base station to the user
  • the neighboring base station is The worst PMI for the user.
  • the pairing principle is slightly different from the single-cell multi-user MIMO pairing. For example, after the terminal feeds back two PMIs to the cell base station, the cell base station transmits the PMI (for example, PMI2) used by the user to the neighboring cell user to the neighboring base station.
  • the neighboring base station finds the user who wants to use PMI2 from its cell, so that this user can be matched with the user of the original cell. If there are more than two PMIs, the PMI other than PMI1 is a set of weighting precoding matrices that the terminal can use when transmitting signals on the same physical resource as the cell in which the terminal is located.
  • the base station can adopt the PMI feedback format shown in Table 1 below.
  • PMI report1 and PMI report2 are the PMI information required for various MIMO modes.
  • PMI reportl and PMI report2 have different meanings for different MIMO modes.
  • PMI report1 and PMI report2 are the respective precoding matrices for the two streams sent to the user; for MU-MIMO mode, PMI reportl and PMI report2 are the PMIs used by the users themselves and wish to be paired with them.
  • PMI used by the user; for the multi-base station cooperative MIMO mode, PMI report1 and PMI report2 are respectively the PMI used by the user and the PMI used by the user who is expected to be paired with other neighboring cells.
  • the terminal can transmit various PMI feedbacks to the base station by using the same feedback format, thereby achieving the purpose of simplifying the feedback signaling overhead.
  • the terminal can feed back more than two PMIs for unifying PMI feedback of various MIMO formats. For example, for SU-MIMO mode, more than two PMIs can be used to transmit more users. Precoding weighting of two data streams; for MU-MIMO mode, more than two PMIs can be used to group terminals, and each PMI fed back by the terminal removes the other PMIs other than the first one. PMIs that other terminals of the group should use; for multi-base station cooperative MIMO mode, more than two PMIs can be used to group terminals between cells, and each PMI fed back by the terminal removes other PMIs other than the first PMI. The PMI that the terminal wants other terminals with other cells to use.
  • Fig. 5 schematically shows an embodiment of the structure of a terminal according to an embodiment of the present invention.
  • the terminal 50 includes a MIMO mode determining unit 51, a PMI determining unit 52, and a feedback unit 53.
  • the MIMO mode determining unit 51 is configured to determine a MIMO mode employed by the mobile terminal.
  • the MIMO mode determining unit 51 may receive an indication from the base station indicating the MIMO mode and determine the MIMO mode to be employed based on the indication.
  • the mode determining unit 51 may determine the MIMO mode that should be adopted according to the channel quality between the cell base station of the cell in which the cell is located, the channel quality between the neighboring base stations, and the like, and notify the cell base station of the determined MIMO mode, and Waiting for confirmation from the base station. In an alternative embodiment, no base station is required for confirmation.
  • the PMI determining unit 52 determines the PMI to be fed back based on the determined MIMO mode. Specifically, for the terminal single-user MIMO mode, the PMI determining unit determines the PMI used by two data streams (or multiple data streams if there are more than two PMIs) for a single user. For the MU-MIMO mode and the multi-base station cooperative MIMO mode, the PMI determining unit determines the PMI that the terminal wishes to use, and the PMI that the user who wishes to use with the group.
  • the feedback unit 53 is configured to feed back the PMI determined by the PMI determining unit to the cell base station. As described above, the feedback unit 53 can feed back PMI information in various MIMO modes in a unified format.
  • FIG. 6 is a view schematically showing an embodiment of a structure of a base station according to an embodiment of the present invention.
  • the base station 60 includes a MIMO mode determining unit 61, a notifying unit 62, a receiving unit 63, and a terminal grouping unit 64.
  • the MIMO mode determining unit 61 determines the MIMO mode that should be used. Specifically, the MIMO mode that should be taken may be determined according to channel information between the base station and the served terminal, or location information of the terminal, and the like. For example, if the terminal is located in a central area of the service area of the base station, the SU-MIMO mode is adopted, and if the terminal is located in the middle area of the base station, the MU-MIMO mode is adopted, and if located in the edge area of the base station, A multi-base station cooperative MIMO mode is adopted.
  • the MIMO mode to be employed may also be determined by the terminal, and a request to request the use of the determined MIMO mode is transmitted to the base station.
  • the notifying unit 62 notifies the terminal of the determined MIMO mode. In addition, when the multi-base station cooperative MIMO mode is employed, the notifying unit 62 also notifies the neighboring base station of the PMI information received from the terminal.
  • the receiving unit 63 receives PMI information from the terminal. As described above, the received PMI information is transmitted by the terminal in a unified format and has different meanings depending on the MIMO mode. In the MU-MIMO mode, the index of the precoding matrix used by the terminal when the terminal wants to communicate with itself, and the precoding matrix used by the terminal when the terminal wants to communicate with other communication devices of its group index.
  • the terminal grouping unit 64 determines the terminals that should be grouped based on the PMI information transmitted by each terminal.
  • the terminal grouping unit searches for PMI4 according to PMI1 and PMI2 transmitted by the first terminal, and PMI3 and PMI4 transmitted by the second terminal.
  • multiple terminals can be grouped.
  • Fig. 7 shows a process performed by a terminal group unit by taking pairing of two terminals as an example in accordance with another embodiment of the present invention.
  • the priority of the first terminal is determined (step 701).
  • the priority of the terminal can be predetermined according to the service agreement.
  • the priority of the terminal can also be determined according to the nature of the data to be transmitted. For example, if data with high real-time requirements, such as video data or voice data, is transmitted between the terminals, it is determined that the terminal has a higher priority, and if the data that is not required for real-time performance is transmitted, such as EMAIL.
  • the data determines that the terminal has a lower priority.
  • step 702 pairing is performed in the terminal of the same priority, that is, PMI1 and PMI2 transmitted by the first terminal, and PMI3 and PMI4 transmitted by the second terminal of the same priority, and the PMI4 is the same as PMI1.
  • the second terminal having the same PMI 3 as the PMI 2 thereby determining the second terminal paired (grouped) with the first terminal.
  • step 703 If the paired second terminal is found (step 703, YES), the processing ends. On the other hand, if the paired second terminal is not found (step 703, No), then in step 704, pairing is performed in the terminal of the secondary priority. That is, according to PMI1 and PMI2 transmitted by the first terminal, and PMI3 and PMI4 transmitted by the second terminal of the second priority, the second terminal with the same PMI4 and PMI1 and the same PMI 3 and PMI2 is searched, thereby determining the first The second terminal of the terminal pairing (grouping).
  • FIG. 8 is a block diagram showing the structure of the terminal grouping unit 64 of the base station according to the above embodiment.
  • the terminal grouping unit includes a terminal priority determining unit 81, a same priority terminal grouping unit 82, a determining unit 83, a secondary priority terminal grouping unit 84, and a sub-optimal grouping unit 85.
  • the terminal priority determining unit 81 determines the priority of the terminal, and the priority terminal grouping unit 82 determines the terminal grouped with the terminal of interest among the terminals of the same priority, and the determining unit 83 determines whether the grouped terminal is found.
  • the sub-priority terminal grouping unit 84 searches for the terminal grouped with the terminal of interest in the sub-priority terminal.
  • the sub-priority grouping unit 85 performs the sub-optimal grouping.
  • FIG. 9 is a diagram showing the structure of a neighboring base station according to an embodiment of the present invention.
  • a neighboring base station according to the present invention includes a receiving unit 91 and a terminal grouping unit 92.
  • the receiving unit 91 receives PMI information from the cell base station described earlier.
  • the terminal grouping unit 92 performs the grouping of the terminals, and the processing thereof is the same as the processing of the terminal grouping unit 64, and details are not described herein.
  • the base station can better control inter-user interference when scheduling multiple users, thereby improving system throughput.
  • the communication system to which the present invention is applicable may be any multiple access system, broadcast/multicast/unicast system, and may be based on any multiple access technology such as OFDMA, CDMA, TDMA, and the like.
  • the above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software.
  • the present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or a step.
  • the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash, or the like.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Description

通信装置、 通信方法和基站 技术领域
本发明涉及通信***, 具体地, 涉及采用 MIMO技术的通信***。 背景技术
在现有无线通信***中, 基站与多个终端通信, 当基站的发送天线和终端 的接收天线有多个时, 可以采用的多天线技术很多, 可以笼统地称这种多天线 技术为多入多出 (MIMO, Multi-Input Multi-Output) 技术。 根据使用方法的不 同,又可以将 MIMO技术划分为单用户 MIMO ( SU-MIMO, Single User MIMO ) 模式、 多用户 MIMO (MU-MIMO, Multiple User MIMO) 模式,以及基站间协 作 MIMO (Multiple Cell MIMO) 模式。
下面对此进行简要的介绍。
基站和终端之间采用 MIMO技术时, 如果基站可以获取基站和终端间的信 道矩阵信息, 则可以进行最佳的预编码, §卩:
X = Ws
其中 W为预编码矩阵, s为发送前信号, X为加权后发送到天线上的信号。 终端接收到的经过 MIMO信道后的信号为: r = HWs
其中 H为 MIMO信道, 如果 H和 W理想匹配, 使得:
0 0
HW = 0 ... 0
0 0 6 则接收机很容易解调出 s。
但是实际***中, 基站很难获得 H, 因此也就很难估计出合适的 W。为此, 终端就需要反馈一些简化的信道信息, 通常可以在基站和终端预存一个双方已 知的预编码码书, 如下:
C = {Wi , W2 ,...,WN }
它包括 N个预编码矩阵 W, 每一个 W在码书中的编号称为预编码矩阵索 引 (PMI, Precoding Matrix Index)。 终端通过测量 MIM0信道 H, 自己估算出 一个合适的 W, 然后把该 W在码书 C中的序号反馈给基站, 基站获得序号后就 可查码书 C得到真正所需的加权矩阵 W。
对于各种 MIMO模式, 终端需要反馈必要的信道信息 (例如 PMI), 如何 减少反馈开销是目前研究的热点。 在作出本发明的过程中, 本发明的发明人发 现, 由于在各种 MIMO模式中, 终端和基站的处理都不尽相同, 因而不能进行 统一的 PMI反馈。 发明内容
本发明的实施方式鉴于现有技术的以上问题作出, 用以克服现有技术中存 在的一个或更多个缺点, 至少提供一种有益的选择。
为了实现以后目的, 本发明提供了以下方面。
方面 1、 一种通信装置, 具有多根天线, 可以采用多输入多输出技术, 所述 通信装置包括:
多输入多输出模式确定单元, 用于确定应采用的多输入多输出模式; 预编码矩阵信息确定单元, 用于根据所确定出的多输入多输出模式, 确定 预编码矩阵;
发送单元, 发送与所述预编码矩阵有关的信息,
其中, 当应采用的多输入多输出模式为单小区多用户多输入多输出模式时, 所述预编码矩阵信息确定单元确定所述通信装置所在小区的服务基站与所述通 信装置进行通信时应使用的预编码矩阵以及所述服务基站与所述小区中的和所 述通信装置成组的其它通信装置进行通信时应使用的预编码矩阵。
方面 2、根据方面 1所述的通信装置, 其特征在于, 当应采用的多输入多输 出模式为多基站合作多输入多输出模式时, 所述预编码矩阵信息确定单元确定 所述服务基站与所述通信装置进行通信时应使用的预编码矩阵以及所述服务基 站的相邻基站与相邻小区中的和所述通信装置成组的其它通信装置进行通信时 应使用的预编码矩阵。
方面 3、根据方面 1所述的通信装置, 其特征在于, 当应采用的多输入多输 出模式为单小区多用户多输入多输出模式时,所述预编码矩阵信息确定单元根据 使所述通信装置从所述服务基站获得的信号的质量最优的准则确定所述服务基 站与所述通信装置进行通信时应使用的预编码矩阵, 根据使所述通信装置从所 述服务基站获得的信号的质量最差的准则确定所述服务基站与所述小区中的和 所述通信装置成组的其它通信装置进行通信时应使用的预编码矩阵。
方面 4、根据方面 2所述的通信装置, 其特征在于, 当应采用的多输入多输 出模式为多基站合作多输入多输出模式时,所述预编码矩阵信息确定单元根据使 所述通信装置从所述服务基站获得的信号的质量最优的准则确定所述服务基站 与所述通信装置进行通信时应使用的预编码矩阵, 根据使所述通信装置从所述 相邻基站获得的信号的质量最差的准则确定相邻基站与相邻小区中的和所述通 信装置成组的其它通信装置进行通信时应使用的预编码矩阵。
方面 5、根据方面 1或 2所述的通信装置, 其特征在于, 当应采用的多输入 多输出模式为单用户多输入多输出模式时, 所述预编码矩阵信息确定单元根据 容量最大化原则或最小化错误率原则确定所述服务基站与所述通信装置进行通 信时应使用的两个或更多个预编码矩阵。
方面 6、根据方面 1所述的通信装置, 其特征在于, 与所述预编码矩阵有关 的信息为所述预编码矩阵自身或预编码矩阵索引。
方面 7、根据方面 1所述的通信装置, 其特征在于, 所述发送单元利用统一 的格式发送各种多输入多输出模式的与所述预编码矩阵有关的信息。
方面 8、 一种基站, 所述基站包括:
多输入多输出模式确定单元, 用于确定应采用的多输入多输出模式; 通知单元, 用于将所确定的多输入多输出模式通知给所服务的终端; 接收单元, 用于接收来自所述终端的与预编码矩阵有关的信息;
以及终端成组单元, 用于在所确定的多输入多输出模式为单小区多用户多 输入多输出模式时, 根据终端所发送的所述与预编码矩阵有关的信息, 进行终 端之间的成组。
方面 9、 根据方面 8所述的基站, 其特征在于, 所述终端成组单元包括: 终 端优先级确定单元、 同优先级终端成组单元、 判断单元、 次优先级终端成组单 元、 以及次优成组单元,
所述终端优先级确定单元判断终端的优先级, 所述同优先级终端成组单元 在相同优先级的终端中确定与所关注的终端成组的终端, 所述判断单元判断是 否找到了成组的终端, 所述次优先级终端成组单元在所述判断单元判断出没有 在同优先级的终端中找到与所关注的终端成组的终端时, 在次优先级的终端中 寻找与该所关注的终端成组的终端, 所述次优先级成组单元在所述判断单元判 断出没有在次优先级的终端中找到与所关注的终端成组的终端时, 进行次优成 组。
方面 10、 一种通信方法, 在接受基站的服务的通信装置中使用, 包括: 确定应采用的多输入多输出模式;
根据所确定出的多输入多输出模式, 确定预编码矩阵;
发送与所述预编码矩阵有关的信息,
其中, 当应采用的多输入多输出模式为单小区多用户多输入多输出模式时, 确定所述通信装置所在小区的服务基站与所述通信装置进行通信时应使用的预 编码矩阵以及所述服务基站与所述小区中的和所述通信装置成组的其它通信装 置进行通信时应使用的预编码矩阵。
方面 11、 一种基站, 所述基站包括:
接收单元, 用于接收来自另一基站的与预编码矩阵有关的信息;
以及终端成组单元, 用于在根据所述与预编码矩阵有关的信息, 进行终端 之间的成组。
方面 12、 一种通信装置, 具有多根天线, 可以采用多输入多输出技术, 所 述通信装置包括:
多输入多输出模式确定单元, 用于确定应采用的多输入多输出模式; 预编码矩阵信息确定单元, 用于根据所确定出的多输入多输出模式, 确定 预编码矩阵;
发送单元, 发送与所述预编码矩阵有关的信息,
其中, 所述预编码矩阵信息确定单元确定与所述多输入多输出模式确定单 元确定出的多输入多输出模式相关多个预编码矩阵, 并且无论所述多输入多输 出模式确定单元确定出的多输入多输出模式为何种多输入多输出模式, 发送单 元都采用相同的消息格式发送与所述多个预编码矩阵相关的信息。
方面 13、根据方面 12所述的通信装置, 其中, 当应采用的多输入多输出模 式为单小区多用户多输入多输出模式时, 所述预编码矩阵信息确定单元确定所 述通信装置所在小区的服务基站与所述通信装置进行通信时应使用的预编码矩 阵以及所述服务基站与所述小区中的和所述通信装置成组的其它通信装置进行 通信时应使用的预编码矩阵。
方面 14、根据方面 12所述的通信装置, 其中, 当应采用的多输入多输出模 式为多基站合作多输入多输出模式时, 所述预编码矩阵信息确定单元确定所述 服务基站与所述通信装置进行通信时应使用的预编码矩阵以及所述服务基站的 相邻基站与相邻小区中的和所述通信装置成组的其它通信装置进行通信时应使 用的预编码矩阵。
方面 15、根据方面 12所述的通信装置, 其中, 当应采用的多输入多输出模 式为单用户多输入多输出模式时, 所述预编码矩阵信息确定单元根据容量最大 化原则或最小化错误率原则确定所述服务基站与所述通信装置进行通信时应使 用的两个或更多个预编码矩阵。
方面 16、 一种通信装置, 具有多根天线, 可以采用多输入多输出技术, 所 述通信装置包括:
多输入多输出模式确定单元, 用于确定应采用的多输入多输出模式; 预编码矩阵信息确定单元, 用于根据所确定出的多输入多输出模式, 确定 预编码矩阵;
发送单元, 发送与所述预编码矩阵有关的信息,
当应采用的多输入多输出模式为多基站合作多输入多输出模式时, 所述预 编码矩阵信息确定单元确定所述服务基站与所述通信装置进行通信时应使用的 预编码矩阵以及所述服务基站的相邻基站与相邻小区中的和所述通信装置成组 的其它通信装置进行通信时应使用的预编码矩阵。
依据本发明的实施方式, 可以设计统一的反馈信令, 能够简化终端处的处 理。
依据本发明的实施方式,无论何种多输入多输出模式,终端都反馈多个(含 两个) PMI信息, 使得基站在调度多用户时可以更方便地控制用户间干扰。
参照后文的说明和附图, 本发明的这些和进一歩的方面和特征将变得更加 清楚。 在所述的说明和附图中, 详细公开了本发明的特定实施方式, 指明了本 发明的原理可以被采用的方式。 应该理解, 本发明在范围上并不因而受到限制。 在所附权利要求的精神和条款的范围内, 本发明包括许多改变、 修改和等同。
针对一种实施方式描述和 /或示出的特征可以以相同或类似的方式在一个 或更多个其它实施方式中使用, 与其它实施方式中的特征相组合, 或替代其它 实施方式中的特征。
应该强调, 术语"包括 /包含"在本文使用时指特征、 要件、 歩骤或组件的存 在, 但并不排除一个或更多个其它特征、 要件、 歩骤或组件的存在或附加。 附图说明
附图示出了本发明的优选实施例, 构成了说明书的一部分, 用于与文字说 明一起进一歩详细地阐释本发明的原理。 其中:
图 1概略示出了在 SU-MIMO模式中, 依据本发明实施方式的通信***的 处理;
图 2概略示出了在 MU-MIMO模式中, 依据本发明实施方式的通信***的 处理;
图 3概略示出了在基站间合作 MIMO模式中, 依据本发明实施方式的通信 ***的处理;
图 4示意性示出依据本发明的实施方式对终端进行配对的原则; 图 5示意性示出了依据本发明实施方式的终端的结构的实施例;
图 6示意性示出了依据本发明一种实施方式的基站的结构的实施例; 图 7示出依据本发明的另一种实施方式, 以对两个终端进行配对为例, 终 端成组单元进行的处理;
图 8示出了依据上述实施方式的基站的终端成组单元 64的结构示意图; 以 及
图 9示出了依据本发明一种实施方式的相邻基站的结构的示意图。 具体实施方式
下面结合附图对依据本发明实施方式的通信***在各种 MIMO模式中的处 理进行概略说明。
图 1概略示出了在 SU-MIMO模式中, 依据本发明实施方式的通信***的 处理。
在 SU-MIMO模式中, 基站利用相同的物理资源给某个用户传输多路信号。 为了保证终端能够区分出多路信号, 基站需要在发送多路信号时对它们分别进 行矩阵加权。 加权矩阵为基站和终端已知的码书中的某个码矩阵。 如图 1所示, 根据本发明的实施方式, 终端反馈两个或者更多个 PMI, 每个对应一个数据流, 这种情况下预编码矩阵简化为预编码矢量。 终端在选择所发送的 PMI时, 选择 的原则可以是容量最大化原则, 或者是差错率最小化等原则。 基站根据反馈的 PMI来加权发送的数据流。
图 2概略示出了在 MU-MIMO模式中, 依据本发明实施方式的通信***的 处理。
在 MU-MIMO模式中, 基站利用相同的物理资源给多个用户传输信号。 为 了尽量避免用户间信号干扰, 基站需要利用 PMI配对 (成组) 的方法。 如图 2 所示, 依据本发明的实施方式, 每个终端反馈两个或者更多个 PMI (图中所示 为两个 PMI) , 其中, 一个 PMI为进行反馈的终端希望自己用的, 其他 PMI为 终端要求与之配对的用户用的。 虽然图中仅示出了两个终端, 但应该注意, 可 以有更多个终端。
在一种实施方式中, 可以采用下式进行 PMI选择:
Figure imgf000011_0001
其中, Hk为基站到用户 k的 MIMO信道矩阵, w为码书中的码字, 它在码 书中的索引简写为 PMI, PMI1为使得 SNR最大的, PMI2为使得 SNR最小的。
以两用户为例说明如何配对 (成组), 如果终端 1反馈 PMI1和 PMI2, 终 端 2反馈 PMI3和 PMI4, 如果终端 1所用 PMI (PMI1 )正好为终端 2所希望其 使用的 PMI4; 终端 2所用 PMI3正好为终端 1所希望其使用的 PMI (PMI2), 则这两个用户就完全配对。
图 4示意性示出依据本发明的实施方式对终端进行配对的原则。 如图 4所 小 , 如果用户 N反馈两个 PMI, 分别对应最好的 SNR和最差的 SNR, 对应最好 的 SNR的称最好 PMI, 对应最差 SNR的称为最差 PMI。
最好 PMI1=X, 最差 PMI2=Y, 另一个用户也反馈两个 PMI, 最好 PMI 1为 Y, 最差 ΡΜΙ2为 X, 则这两个用户正好配对, 用户 Ν的最好 ΡΜΙ对应用户 Μ 的最差 ΡΜΙ, 用户 Ν的最差 ΡΜΙ对应用户 Μ的最好 ΡΜΙ。
其他配对原则可以为按照终端优先级部分匹配, 比如, 如果终端 1优先级 端 1使用的 PMI1是否为终端 2所要求其使用的 PMI4不做规定, 如图 2所示。 如果 PMI多于 2个,则除去 PMI1以外的其他 PMI为终端希望与之成组的终端应 该使用的 PMI, 组里的终端可以为多水
图 3概略示出了在基站间合作 MIMO模式中, 依据本发明实施方式的通信 ***的处理。
在基站间合作 MIMO模式中, 多个基站利用相同的物理资源给不同小区内的 多个用户传输信号。 为了尽量避免小区间占用同样物理资源的用户之间发生信号 干扰, 基站间需要利用 ΡΜΙ配对 (成组) 的方法。 在本发明的实施方式中, 每 ϋ水 终端反馈两个或者多个 ΡΜΙ, 其中, 一个 ΡΜΙ (例如 PMI1 ) 是终端希望该终端 在的小区 (服务小区) 的基站 (也称小区基站或服务基站) 对发送给自己的信 进行加权所用的预编码矩阵, 其它的 ΡΜΙ (例如 ΡΜΙ2 )为终端希望其他相邻小 的基站 (也称相邻基站) 在与服务小区相同的物理资源上对传输信号进行加权 所用的预编码矩阵。
例如, 终端可以依据下式进行 ΡΜΙ选择:
Figure imgf000012_0001
其中, H 为服务基站到用户 k的 MIMO信道矩阵, H2 k为相邻基站到用户 k的 MIMO信道, w^n w2分别为服务基站到该用户的最好 PMI, 和相邻基站到 该用户的最差 PMI。 配对原则与单小区多用户 MIMO配对略有不同, 比如: 终 端反馈两个 PMI到小区基站后, 小区基站就把该用户希望相邻小区用户使用的 PMI (例如 PMI2 )发送给相邻基站。相邻基站从它的小区内找到希望使用 PMI2 的用户, 从而可以将这个用户与原小区的用户匹配起来。 如果 PMI多于 2个, 则除去 PMI1以外的其他 PMI为终端希望其他相邻小 区的基站在与该终端所在的小区相同的物理资源上传输信号时可以使用的加权 用预编码矩阵集合。
如前所述, 在各种 MIMO模式中, 都要进行预编码矩阵索引的反馈。 根据 本发明的实施方式, 由于对于各种 MIMO模式,终端都反馈两个或更多个 PMI, 因而可以设计统一的 PMI反馈格式, 从而终端不需要根据 MIMO模式的而采用 不同调整反馈信息格式。
例如, 基站可以采用下表 1所示的 PMI反馈格式。
Figure imgf000013_0001
表 1
其中, PMI reportl和 PMI report2即为各种 MIMO模式需要的 PMI信息。 在 使用这种反馈格式时,对于不同的 MIMO模式, PMI reportl和 PMI report2内容含 义不同。 比如: 对于 SU-MIMO模式, PMI reportl和 PMI report2为发给该用户两 个流的各自的预编码矩阵;对于 MU-MIMO模式, PMI reportl和 PMI report2为用 户自己使用的 PMI和希望与之配对的用户使用的 PMI;对于多基站合作 MIMO模 式, PMI reportl 和 PMI report2分别为用户自己使用的 PMI和希望其他相邻小区 与之配对的用户使用的 PMI。
这样, 使用这种统一格式的 PMI反馈, 终端可以用相同的反馈格式把各种 PMI反馈传输给基站, 从而实现简化反馈信令开销的目的。
另外, 终端可以反馈多于两个的 PMI, 用于统一各种 MIMO格式的 PMI 反馈, 比如, 对于 SU-MIMO模式, 多于两个的 PMI可以用于给用户传输多于 两个数据流的预编码加权; 对于 MU-MIMO模式, 多于两个的 PMI可以用于把 终端分组, 每个终端反馈的 PMI中除去第一个外的其他 PMI为该终端希望与之 成组的其他终端应该使用的 PMI;对于多基站合作 MIMO模式,多于两个的 PMI 可以用于把小区间的终端分组, 每个终端反馈的 PMI中除去第一个 PMI外的其 他 PMI为该终端希望其他小区与之成组的其他终端应该使用的 PMI。
下面结合附图详细说明依据本发明实施方式的通信***中的基站和终端。 图 5示意性示出了依据本发明实施方式的终端的结构的实施例。 如图 5所 示, 依据本发明的实施方式, 终端 50包括 MIMO模式确定单元 51、 PMI确定 单元 52以及反馈单元 53。
MIMO模式确定单元 51用于确定移动终端所采用的 MIMO模式。 MIMO 模式确定单元 51可以接收来自基站的指示 MIMO模式的指示,并根据该指示确 定所应采用的 MIMO模式。此外, 该模式确定单元 51可以根据与所在小区的小 区基站之间的信道质量、 与相邻基站之间的信道质量等确定应采用的 MIMO模 式, 将所确定的 MIMO模式通知给小区基站, 并等待来自基站的确认。 在另选 的实施方式中, 无需基站进行确认。
PMI确定单元 52根据所确定的 MIMO模式确定应反馈的 PMI。 具体地, 对于终端单用户 MIMO模式, PMI确定单元确定单用户的两个数据流 (或多个 数据流, 如果有多于两个 PMI时)使用的 PMI。 对于 MU-MIMO模式和多基站 合作 MIMO模式, PMI确定单元确定终端自己希望使用的 PMI, 以及希望与之 成组的用户使用的 PMI。
反馈单元 53用于向小区基站反馈 PMI确定单元所确定出的 PMI。 如上所 述, 反馈单元 53可以采用统一的格式反馈各种 MIMO模式下的 PMI信息。
图 6示意性示出了依据本发明一种实施方式的基站的结构的实施例。如图 6 所示, 依据本发明的实施方式, 基站 60包括 MIMO模式确定单元 61、 通知单 元 62、 接收单元 63以及终端成组单元 64。
MIMO模式确定单元 61确定应使用的 MIMO模式。 具体地, 可以根据该 基站与所服务的终端之间的信道信息、 或所述终端的位置信息等确定应采取的 MIMO模式。 例如如果所述终端位于所述基站的服务区的中心区域, 则采用 SU 一 MIMO模式, 如果终端位于所述基站的中间区域, 则采用 MU— MIMO模式, 如果位于所述基站的边缘区域, 则采用多基站合作 MIMO模式。 此外, 例如如 果所述基站与所服务的终端之间的信道质量好于第一阈值, 则采用采用 SU— MIMO模式, 如果所述基站与所服务的终端之间的信道质量差于第一阈值但好 于第二阈值, 则采用 MU— MIMO模式, 如果差于第二阈值, 则采用多基站合 作 MIMO模式。 另外, 也可以由终端确定应采用的 MIMO模式, 并将请求采用 所确定的 MIMO模式的请求发送给基站。
通知单元 62将所确定的 MIMO模式通知给终端。 另外, 在采用多基站合 作 MIMO模式时,通知单元 62还将从终端接收来的 PMI信息通知给相邻基站。
接收单元 63从终端接收 PMI信息。 如上所述, 所接收的 PMI信息由终端 利用统一的格式传送, 并根据 MIMO模式的不同而含义不同。 在 MU— MIMO 模式下, 所传送的该终端希望基站与自身通信时所采用的预编码矩阵的索引, 以及该终端希望基站与和其成组的其它通信装置通信时所采用的预编码矩阵的 索引。
在 MU-MIMO模式下, 终端成组单元 64根据各终端发送来的 PMI信息, 确定应该成组的终端。
根据一种实施方式, 以对两个终端进行配对为例, 终端成组单元根据第一 终端所传送来的 PMI1和 PMI2,以及第二终端传送来的 PMI3和 PMI4,查找 PMI4 与 PMI1相同并且 PMI 3与 PMI2相同的第二终端,从而确定与第一终端配对(成 组) 的第二终端。
类似地, 可以对多个终端进行分组。
图 7示出依据本发明的另一种实施方式, 以对两个终端进行配对为例, 终 端成组单元进行的处理。 如图 7所示, 依据本发明的另一种实施方式, 首先, 确定第一终端的优先级(歩骤 701 )。终端的优先级可以根据服务协议预先确定。 也可以根据所要传输的数据的性质确定终端的优先级。 例如如果与终端间传送 的是对实时性要求较高的数据, 例如视频数据或话音数据, 则确定终端具有较 高的优先级, 而如果传送的是对实时性要求不高的数据, 如 EMAIL数据, 则确 定终端具有较低的优先级。
然后, 在歩骤 702, 在同优先级的终端中进行配对, 即根据第一终端所传送 来的 PMI1和 PMI2,以及同优先级的第二终端传送来的 PMI3和 PMI4,查找 PMI4 与 PMI1相同、 并且 PMI 3与 PMI2相同的第二终端, 从而确定与第一终端配对 (成组) 的第二终端。
如果找到了配对的第二终端 (歩骤 703, 是), 则结束处理。 另一方面, 如 果没有找到配对的第二终端 (歩骤 703, 否), 则在歩骤 704, 在次优先级的终 端中进行配对。 即根据第一终端所传送来的 PMI1和 PMI2, 以及次优先级的第 二终端传送来的 PMI3和 PMI4, 查找 PMI4与 PMI1相同、 并且 PMI 3与 PMI2 相同的第二终端, 从而确定与第一终端配对 (成组) 的第二终端。
如果找到了配对的第二终端 (歩骤 705, 是), 则结束处理。 另一方面, 如 果没有找到配对的第二终端 (歩骤 705, 否), 则在歩骤 706, 在次优先级的终 端中进行次级配对。 即根据第一终端所传送来的 PMI1和 PMI2, 以及次优先级 的第二终端传送来的 PMI3和 PMI4,查找 PMI3与 PMI2相同的第二终端,从而 确定与第一终端配对(成组)的第二终端(次优成组)。该处理在歩骤 707结束。 图 8示出了依据上述实施方式的基站的终端成组单元 64的结构示意图。
如图 8所示, 终端成组单元包括终端优先级确定单元 81、 同优先级终端成 组单元 82、 判断单元 83、 次优先级终端成组单元 84、 以及次优成组单元 85。
终端优先级确定单元 81判断终端的优先级, 同优先级终端成组单元 82在相 同优先级的终端中确定与所关注的终端成组的终端, 判断单元 83判断是否找到了 成组的终端, 在判断单元 83判断出同优先级终端成组单元 82没有找到成组的终 端时, 次优先级终端成组单元 84在次优先级的终端中寻找与该所关注的终端成组 的终端。 在判断单元 83判断出次优先级终端成组单元 84没有找到成组的终端时, 次优先级成组单元 85进行次优成组。
图 9示出了依据本发明一种实施方式的相邻基站的结构的示意图。 如图 9 所示, 依据本发明的相邻基站包括接收单元 91 和终端成组单元 92。 接收单元 91接收来自前面所述的小区基站的 PMI信息。 终端成组单元 92进行终端的成 组, 其处理与上述终端成组单元 64的处理相同, 在此不予赘述。
通过设计统一的反馈信令, 可以使得基站在调度多用户时更好的控制用户 间干扰, 从而提高***吞吐量。
本发明适用的通信***可以是任意的多址***、广播 /组播 /单播***, 可以 基于任意的多址技术, 比如: OFDMA、 CDMA, TDMA等。
本发明以上的装置和方法可以由硬件实现, 也可以由硬件结合软件实现。 本发明涉及这样的计算机可读程序, 当该程序被逻辑部件所执行时, 能够使该 逻辑部件实现上文所述的装置或构成部件, 或使该逻辑部件实现上文所述的各 种方法或歩骤。 本发明还涉及用于存储以上程序的存储介质, 如硬盘、 磁盘、 光盘、 DVD、 flash等。 以上结合具体的实施方式对本发明进行了描述, 但本领域技术人员应该清 楚, 这些描述都是示例性的, 并不是对本发明保护范围的限制。 本领域技术人 员可以根据本发明的精神和原理对本发明作出各种变型和修改, 这些变型和修 改也在本发明的范围内。

Claims

权利要求书
1、 一种通信装置, 具有多根天线, 可以采用多输入多输出技术, 所述通信 装置包括:
多输入多输出模式确定单元, 用于确定应采用的多输入多输出模式; 预编码矩阵信息确定单元, 用于根据所确定出的多输入多输出模式, 确定 预编码矩阵;
发送单元, 发送与所述预编码矩阵有关的信息,
其中, 当应采用的多输入多输出模式为单小区多用户多输入多输出模式时, 所述预编码矩阵信息确定单元确定所述通信装置所在小区的服务基站与所述通 信装置进行通信时应使用的预编码矩阵以及所述服务基站与所述小区中的和所 述通信装置成组的其它通信装置进行通信时应使用的预编码矩阵。
2、 根据权利要求 1所述的通信装置, 其特征在于, 当应采用的多输入多输 出模式为多基站合作多输入多输出模式时, 所述预编码矩阵信息确定单元确定 所述服务基站与所述通信装置进行通信时应使用的预编码矩阵以及所述服务基 站的相邻基站与相邻小区中的和所述通信装置成组的其它通信装置进行通信时 应使用的预编码矩阵。
3、 根据权利要求 1所述的通信装置, 其特征在于, 当应采用的多输入多输 出模式为单小区多用户多输入多输出模式时,所述预编码矩阵信息确定单元根据 使所述通信装置从所述服务基站获得的信号的质量最优的准则确定所述服务基 站与所述通信装置进行通信时应使用的预编码矩阵, 根据使所述通信装置从所 述服务基站获得的信号的质量最差的准则确定所述服务基站与所述小区中的和 所述通信装置成组的其它通信装置进行通信时应使用的预编码矩阵。
4、 根据权利要求 2所述的通信装置, 其特征在于, 当应采用的多输入多输 出模式为多基站合作多输入多输出模式时,所述预编码矩阵信息确定单元根据使 所述通信装置从所述服务基站获得的信号的质量最优的准则确定所述服务基站 与所述通信装置进行通信时应使用的预编码矩阵, 根据使所述通信装置从所述 相邻基站获得的信号的质量最差的准则确定相邻基站与相邻小区中的和所述通 信装置成组的其它通信装置进行通信时应使用的预编码矩阵。
5、 根据权利要求 1或 2所述的通信装置, 其特征在于, 当应采用的多输入 多输出模式为单用户多输入多输出模式时, 所述预编码矩阵信息确定单元根据 容量最大化原则或最小化错误率原则确定所述服务基站与所述通信装置进行通 信时应使用的两个或更多个预编码矩阵。
6、 根据权利要求 1所述的通信装置, 其特征在于, 与所述预编码矩阵有关 的信息为所述预编码矩阵自身或预编码矩阵索引。
7、 根据权利要求 1所述的通信装置, 其特征在于, 所述发送单元利用统一 的格式发送各种多输入多输出模式的与所述预编码矩阵有关的信息。
8、 一种基站, 所述基站包括:
多输入多输出模式确定单元, 用于确定应采用的多输入多输出模式; 通知单元, 用于将所确定的多输入多输出模式通知给所服务的终端; 接收单元, 用于接收来自所述终端的与预编码矩阵有关的信息;
以及终端成组单元, 用于在所确定的多输入多输出模式为单小区多用户多 输入多输出模式时, 根据终端所发送的所述与预编码矩阵有关的信息, 进行终 端之间的成组。
9、 根据权利要求 8所述的基站, 其特征在于, 所述终端成组单元包括: 终 端优先级确定单元、 同优先级终端成组单元、 判断单元、 次优先级终端成组单 元、 以及次优成组单元, 所述终端优先级确定单元判断终端的优先级, 所述同优先级终端成组单元 在相同优先级的终端中确定与所关注的终端成组的终端, 所述判断单元判断是 否找到了成组的终端, 所述次优先级终端成组单元在所述判断单元判断出没有 在同优先级的终端中找到与所关注的终端成组的终端时, 在次优先级的终端中 寻找与该所关注的终端成组的终端, 所述次优先级成组单元在所述判断单元判 断出没有在次优先级的终端中找到与所关注的终端成组的终端时, 进行次优成 组。
10、 一种通信方法, 在接受基站的服务的通信装置中使用, 包括: 确定应采用的多输入多输出模式;
根据所确定出的多输入多输出模式, 确定预编码矩阵;
发送与所述预编码矩阵有关的信息,
其中, 当应采用的多输入多输出模式为单小区多用户多输入多输出模式时, 确定所述通信装置所在小区的服务基站与所述通信装置进行通信时应使用的预 编码矩阵以及所述服务基站与所述小区中的和所述通信装置成组的其它通信装 置进行通信时应使用的预编码矩阵。
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