WO2014048158A1 - 基站、无线通信终端、无线通信系统和无线通信方法 - Google Patents

基站、无线通信终端、无线通信系统和无线通信方法 Download PDF

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Publication number
WO2014048158A1
WO2014048158A1 PCT/CN2013/078987 CN2013078987W WO2014048158A1 WO 2014048158 A1 WO2014048158 A1 WO 2014048158A1 CN 2013078987 W CN2013078987 W CN 2013078987W WO 2014048158 A1 WO2014048158 A1 WO 2014048158A1
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WIPO (PCT)
Prior art keywords
state information
channel state
feedback
channel
base station
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2013/078987
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English (en)
French (fr)
Inventor
崔棋楣
王辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
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Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Priority to EP13842745.5A priority Critical patent/EP2903194B1/en
Priority to US14/431,356 priority patent/US9948360B2/en
Priority to ES13842745T priority patent/ES2738103T3/es
Priority to KR1020177023099A priority patent/KR101910309B1/ko
Priority to KR1020157010705A priority patent/KR101771826B1/ko
Priority to JP2015533414A priority patent/JP6028869B2/ja
Publication of WO2014048158A1 publication Critical patent/WO2014048158A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04B7/022Site diversity; Macro-diversity
    • H04B7/024Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • 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]
    • 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
    • H04L1/0026Transmission of channel quality indication
    • 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
    • H04L1/0027Scheduling of signalling, e.g. occurrence thereof

Definitions

  • Base station wireless communication terminal, wireless communication system, and wireless communication method
  • the present invention relates to the field of wireless communications, and in particular, to a base station, a wireless communication terminal, a wireless communication system, and a wireless communication method.
  • Cooperative multipoint transmission is a technology in which a plurality of base stations cooperate with each other to perform data communication with a communication terminal.
  • cooperative multipoint transmission refers to a technique in which a plurality of base stations simultaneously perform data communication with one communication terminal. This technology can expand the coverage of high data rate communication and effectively solve the problem of inter-cell interference caused by orthogonal frequency division multiplexing (OFDM).
  • OFDM orthogonal frequency division multiplexing
  • a wireless communication terminal as a user equipment needs to feed back to each cooperative base station a design capable of reflecting a downlink channel state and for assisting a base station in determining a transmission scheme (cooperative multipoint transmission point set)
  • channel state information is collectively referred to as channel state information.
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • CDM non-time division multiplexing of code division multiplexing
  • a plurality of channel state information are transmitted on the same physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH), and arrive at the base station end at different times.
  • PUSCH physical uplink control channel
  • a plurality of channel state information adopts a multiplexing method such as frequency division multiplexing or code division multiplexing, and a plurality of channel state information arrives at the base station end at the same time.
  • multi-channel status information feedback involves two important factors: scheduling delay and PUCCH or PUSCH coverage.
  • scheduling delay and PUCCH or PUSCH coverage.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a novel and improved base station, a wireless communication terminal, a wireless communication system, and a wireless communication method capable of determining that it needs to be considered by considering an uplink channel quality
  • a base station that feeds back channel state information and determines the specific manner in which feedback is used by considering the amount of state information to be fed back and the quality of the uplink channel.
  • the channel state information can be fed back only to the base station with good uplink channel quality; secondly, after determining the base station for which feedback is needed, if the number of channel state information to be fed back is required If the number of channel state information is large, the non-time-separated feedback scheme may be used to reduce the coverage of PUCCH or PUSCH. In this case, a hybrid multiplexing feedback scheme may be adopted. In addition, the specific multiplexing feedback manner of the channel state information may be determined according to the uplink channel quality, and the channel state information more related to the uplink channel with better channel quality is given a higher multiplexing feedback priority.
  • a base station that can be used for coordinated multi-point transmission, including: a channel quality acquiring unit, configured to acquire an uplink channel quality between a user equipment and a cooperative base station; a quality determining unit, configured to determine, by comparing the obtained uplink channel quality with a first quality threshold, a quality of the uplink channel; and a feedback control unit, configured to determine, according to the determination result, whether the user equipment is allowed to feed back the channel state to the corresponding cooperative base station Information And a sending unit, configured to send information indicating how to perform channel state information feedback to the user equipment.
  • the feedback control unit determines that the user equipment is allowed to feed back the channel state information to the corresponding cooperative base station; when the judgment result is that the uplink channel quality is worse than the first quality threshold.
  • the feedback control unit determines that the user equipment is not allowed to feed back the channel state information to the corresponding cooperative base station.
  • a wireless communication system including the base station which can be used for coordinated multipoint transmission mentioned in the above aspect is provided.
  • a wireless communication method for cooperative multipoint transmission including: a channel quality acquisition step of acquiring an uplink channel quality between a user equipment and a cooperative base station; a judging step of judging the quality of the uplink channel quality by comparing the obtained uplink channel quality with the first quality threshold; and a feedback control step of determining, according to the determination result, whether the user equipment is allowed to feed back the channel state information to the corresponding cooperative base station; and sending step Sending information indicating how to perform channel state information feedback to the user equipment.
  • the feedback control step when the result of the determination is that the uplink channel quality is better than the signal represented by the first quality threshold, it is determined that the user equipment is allowed to feed back the channel state information to the corresponding cooperative base station; when the judgment result is that the uplink channel quality is worse than the first When the channel quality represented by the quality threshold is determined, it is determined that the user equipment is not allowed to feed back the channel state information to the corresponding cooperative base station.
  • a base station that can be used for coordinated multi-point transmission, including: a channel quality acquisition unit, configured to acquire an uplink channel quality between a user equipment and a cooperative base station; a setting unit, configured to set a priority for channel state information according to a definition of channel state information and an uplink channel quality between the user equipment and each cooperative base station; and a determining unit for feeding, when the user equipment is to be time-divided a feedback multiplexing mode for determining the channel state information according to the set priority, and a sending unit, configured to send the information indicating the determined feedback multiplexing mode to the user equipment, .
  • the priority setting unit sets the priority: setting a higher priority to the channel state information more relevant to the uplink channel with better channel quality; and wherein the feedback mode determining unit determines the feedback multiplexing mode such that: The channel state information using time division multiplexing has a higher priority than the channel state information using non-time division multiplexing, and in the channel state information using non-time division multiplexing feedback, a group of non-time division complexes sharing the same time period is used. The channel state information having a small number of channel state information is used with a higher priority than the channel state information having a larger number of non-time division multiplexed channel state information sharing another another period of time.
  • a wireless communication system comprising the base station which can be used for coordinated multipoint transmission as mentioned in the above aspect. - -
  • a wireless communication method for coordinated multipoint transmission including: a channel quality acquisition step of acquiring an uplink channel quality between a user equipment and a cooperative base station; priority setting a step of setting a priority for the channel state information according to the definition of the channel state information and the uplink channel quality between the user equipment and each of the cooperative base stations; and a feedback mode determining step of mixing the time and the time division in the user equipment When the feedback mode feeds back the channel state information, the feedback multiplexing mode of the channel state information is determined according to the set priority; and the sending step is performed, and the information indicating the determined feedback multiplexing mode is sent to the user equipment.
  • the priority is set in the priority setting step: setting a higher priority to the channel state information more relevant to the uplink channel with better channel quality; and wherein the feedback complex is determined in the feedback mode determining step Usage: the priority of channel state information using time division multiplexing is higher than the priority of channel state information using non-time division multiplexing, and in channel state information using non-time division multiplexing feedback, one group shares the same time period
  • the channel state information with a small number of non-time division multiplexed channel state information has a higher priority than the channel state information of another group of non-time division multiplexed channel state information sharing another identical time period.
  • a wireless communication terminal capable of being used for coordinated multipoint transmission, including: a channel quality acquisition unit, configured to acquire an uplink between a wireless communication terminal and each coordinated base station a quality setting unit; a priority setting unit configured to set a priority for channel state information by defining a channel state information and an uplink channel shield between the wireless communication terminal and each of the cooperative base stations; and determining a feedback manner a unit, configured to: when a wireless communication terminal feeds back channel state information in a feedback manner that is time-division and non-time-division mixed, determining a feedback multiplexing mode of the channel state information according to the set priority; and a feedback unit, configured to determine according to the feedback manner The determination result of the unit feeds back channel state information.
  • the priority setting unit sets the priority: setting a higher priority to the channel state information more relevant to the uplink channel with better channel quality; and wherein the feedback mode determining unit determines the feedback multiplexing mode such that: The channel state information using time division multiplexing has a higher priority than the channel state information using non-time division multiplexing, and in the channel state information using non-time division multiplexing feedback, a group of non-time division complexes sharing the same time period is used. The channel state information having a small number of channel state information is used with a higher priority than the channel state information having a larger number of non-time division multiplexed channel state information sharing another another period of time.
  • a wireless communication terminal capable of being used for cooperative multipoint transmission, including: a channel state information quantity determining unit, configured to determine a feedback to be based on a definition of channel state information a quantity of channel state information; a feedback mode determining unit, configured to determine a feedback manner of the channel state information according to the determined number of channel state information to be fed back; and a feedback unit configured to determine a feedback channel of the determining result according to the feedback manner shape - state information, wherein, when the number of channel state information to be fed back is greater than a predetermined threshold, the feedback mode; and when the number of channel state information to be fed back is less than or equal to a predetermined threshold, the reverse request mode determining unit determines a single feedback mode As a feedback method of channel state information.
  • the present invention it is possible to determine a base station that needs to feed back channel state information by considering the uplink channel quality, and to determine the specific manner in which feedback is used by considering the number of state information to be fed back and the quality of the uplink channel.
  • the overhead of unnecessary feedback is reduced; on the other hand, a satisfactory trade-off is made between the scheduling delay of the coordinated multi-point transmission system and the PUCCH or PUSCH coverage.
  • FIG. 1 is an explanatory diagram illustrating a configuration of a communication system 1 according to an embodiment of the present invention.
  • FIG. 2 is a block diagram illustrating a functional structure of a base station according to an embodiment of the present invention.
  • FIG. 3 is a flow chart showing a control method of channel state information feedback according to an embodiment of the present invention.
  • FIG. 4 is a block diagram illustrating a functional structure of a base station according to another embodiment of the present invention.
  • FIG. 5 are diagrams each showing a feedback manner of non-time division multiplexing and time division and non-time division hybrid multiplexing of channel state information.
  • FIG. 6 is a block diagram illustrating a functional configuration of a base station according to another embodiment of the present invention.
  • FIG. 7 is a block diagram showing a functional configuration of a base station according to an embodiment of the present invention.
  • FIG. 8 is a flowchart showing a method of determining a channel state information feedback multiplexing mode according to an embodiment of the present invention.
  • FIG. 9 is a block diagram schematically showing a functional configuration of a communication terminal according to an embodiment of the present invention.
  • a plurality of elements having substantially the same function and structure may be distinguished from each other by the same reference numerals of different letter suffixes.
  • a plurality of elements having substantially the same function and structure are distinguished from each other, such as base stations 10A, 10B, 10C, and 10D.
  • base stations 10A, 10B, 10C, and 10D when it is not necessary to separately distinguish a plurality of elements having substantially the same function and structure, only the same reference numerals are attached.
  • the base station 10A, 10B, 10C, and 10D it is simply referred to as the base station 10.
  • a communication system 1 is an explanatory diagram illustrating a configuration of a communication system 1 according to an embodiment of the present invention.
  • a communication system 1 according to an embodiment of the present invention includes a plurality of base stations 10 and communication terminals 20.
  • the communication terminal 20 (user equipment) communicates with the base station 10 under the control of the base station 10. For example, the communication terminal 20 performs reception processing in the downlink resources assigned by the base station 10, and performs transmission processing in the uplink resources.
  • the communication terminal 20 may be an information processing device such as a personal computer (PC), a home video processing device (DVD recorder, video tape recorder, etc.), a personal digital assistant (PDA), a home game machine, or a home appliance. Further, the communication terminal 20 may be a mobile communication device such as a portable telephone, a personal handy phone system (PHS), a portable music playback device, a portable video processing device, or a portable game machine.
  • a personal computer PC
  • PDA personal digital assistant
  • the communication terminal 20 may be a mobile communication device such as a portable telephone, a personal handy phone system (PHS), a portable music playback device, a portable video processing device, or a portable game machine.
  • PHS personal handy phone system
  • the base station 10 communicates with a communication terminal 20 located within its coverage.
  • base station 10A can communicate with communication terminal 20A located within the coverage of base station 10A.
  • the description will be made under the assumption that the base station 10 is a macro cell base station (eNodeB), but the base station 10 is not limited to the macro cell base station.
  • the base station 10 may be a picocell/microcell base station having a maximum transmission power smaller than a macrocell base station, or may be a relay node or a femtocell base station.
  • Data communication between base stations 10 can be facilitated to facilitate coordinated multipoint transmission.
  • the base station serving the communication terminal 20 when the communication method of the coordinated multi-point transmission is stopped and the communication is switched to the conventional non-cooperative mode is referred to as the primary base station.
  • the base stations that cooperate outside the primary base station will be referred to as other base stations.
  • the respective operations in the control of channel state information feedback may be performed in the primary base station, in one of the other base stations, or in cooperation with the primary base station and one or several other base stations.
  • FIG. 2 is a block diagram illustrating a functional configuration of a base station 200 according to an embodiment of the present invention.
  • the base station 200 can be an example of the base station 10 in the communication system 1 shown in FIG.
  • a base station 200 according to an embodiment of the present invention includes a channel quality acquiring unit 210 and a channel quality determining unit. - -
  • the channel quality acquisition unit 210 acquires the uplink channel quality between the communication terminal 20 and the cooperative base station.
  • the channel quality acquisition unit 210 can acquire the uplink channel quality using various methods conventionally employed in the art. For example, a value of a parameter capable of indicating the quality of the uplink channel is obtained based on the communication signal (uplink channel signal) received from the communication terminal 20 via the corresponding uplink channel.
  • the parameter fci capable of indicating the quality of the uplink channel such as the uplink received signal power, the uplink received signal signal to interference and noise ratio, and the like.
  • the channel quality judging unit 220 judges the quality of the uplink channel quality by comparing the uplink channel quality obtained by the channel quality obtaining unit 210 with a predetermined quality threshold Thl (corresponding to the "first quality threshold").
  • the quality threshold Thl can be designed based on the design requirements of the system. In one example, considering that when the base station receives the channel state information for feedback, if the channel state information cannot be accurately demodulated, the feedback will be inefficient or invalid. In this case, it is not necessary to perform channel state information feedback for such a base station whose uplink channel quality is not good. Therefore, the quality threshold Th1 can be set to: when the uplink channel quality is better than the channel quality represented by the quality threshold Th1, the demodulation result of the feedback channel state information can reach the system requirement; and, when the uplink signal i1 ⁇ 2 is worse than the quality When the channel quality represented by the threshold Th1 is reached, the demodulation result of the feedback channel state information cannot meet the system requirements. Specifically, the threshold value Thl is determined as the sum value to satisfy the system demodulation performance, and the system test needs to be performed in advance, and is determined according to the test result.
  • the feedback control unit 230 determines, based on the judgment result supplied from the channel quality judging unit 220, whether or not the communication terminal 20 is allowed to feed back the channel state information to the corresponding cooperative base station.
  • the feedback control unit 230 determines that the communication terminal 20 is allowed to feed back the channel state information to the corresponding cooperative base station; when the judgment result is that the uplink channel quality is worse than the quality threshold Thl At the channel quality, the feedback control unit 230 determines that the communication terminal 20 is not allowed to feed back channel state information to the corresponding cooperative base station.
  • the transmitting unit 240 transmits information indicating how to perform channel state information feedback to the communication terminal 20.
  • the communication terminal 20 performs channel state information feedback based on the information received from the base station 10 indicating how to perform channel state information feedback.
  • the information fed back by the channel state information may include a determination result of the feedback control unit 230, a specific feedback manner of the channel state information determined in other manners, and the like.
  • the base station 200 determines whether to allow the communication terminal 20 to feed back the channel state to the corresponding base station according to the quality of the uplink channel between the communication terminal 20 and each of the cooperative base stations. - - Information. By selecting the base station that allows feedback, the number of base stations that are fed back channel state information is reduced, thereby indirectly reducing the number of channel state information that needs to be fed back, and reducing the communication resources occupied by the channel state information feedback.
  • the feedback control unit 230 can be configured to regardless of the uplink channel quality between the communication terminal 20 and the primary base station (e.g., base station 10A) in the cooperative base station 10. Both allow the communication terminal 20 to feed back the channel state information to the primary base station in accordance with the feedback mode under the non-cooperative multipoint transmission. In other words, the feedback control unit 230 can be configured to always allow feedback of channel state information to the primary base station regardless of the quality of the uplink channel between the communication terminal 20 and the primary base station 10A in the cooperative base station 10.
  • This configuration facilitates switching between multi-point collaboration and non-multipoint collaboration.
  • the communication terminal 20 is in a multi-point coordinated service state, and then for some reason (for example, the communication terminal 20 is moving to the primary base station 10A), the multi-point cooperation service is no longer needed, and the handover can be switched to non-multipoint.
  • the state of cooperation only feeds back the channel state information of the primary base station 10A. It can be seen that whether in the multi-point cooperation or the non-multi-point cooperation state, if the feedback manner of the related information of the primary base station remains unchanged, the switching between the multi-point cooperation and the non-multi-point cooperation is facilitated.
  • FIG. 3 is a flow chart showing a control method of channel state information feedback according to an embodiment of the present invention.
  • step S301 the uplink channel quality between the communication terminal 20 and each of the cooperative base stations is acquired.
  • the uplink channel quality can be obtained using various methods conventionally employed in the art. For example, a value of a parameter capable of indicating the quality of the uplink channel is acquired based on the uplink channel signal received from the communication terminal 20.
  • step S302 the quality of the uplink channel is judged by comparing the obtained uplink channel quality with a predetermined quality threshold Thl.
  • the quality threshold Thl can be designed based on the design requirements of the system.
  • the quality threshold Th1 may be set to: when the uplink channel quality is better than the channel quality represented by the quality threshold Thl, the demodulation result of the feedback channel state information can reach the system requirement; and, when the uplink signal is worse than the quality threshold Thl When the representative signal is received, the demodulated result of the feedback channel state information cannot meet the system requirements.
  • step S303 it is determined according to the result of the determination in step S302 whether or not the communication terminal 20 is allowed to feed back the channel state information to the corresponding cooperative base station.
  • the uplink channel quality is better than the channel quality represented by the quality threshold Thl
  • the uplink channel quality is worse than the channel quality represented by the quality threshold Thl
  • the corresponding cooperative base station feeds back channel status information.
  • step S304 information indicating how to perform channel state information feedback is transmitted to the communication terminal 20 to control the communication terminal 20 to perform channel state information feedback to the corresponding cooperative base station.
  • the information indicating how to perform channel state information feedback may include the determination result in step S303 and the specific feedback manner of the channel state information determined according to other methods.
  • FIG. 4 is a block diagram illustrating a functional configuration of a base station 400 according to another embodiment of the present invention.
  • the base station 400 includes: a channel quality obtaining unit 210, a channel quality determining unit 220, a feedback control unit 230, a transmitting unit 240, a channel state information quantity determining unit 450, and a first feedback mode determining unit 460.
  • the channel quality obtaining unit 210, the signal determining unit 220, the feedback control unit 230, and the transmitting unit 240 have the same structures and functions as those of the corresponding units described with reference to FIG. 2, and a detailed description thereof is omitted herein.
  • the channel state information number determining unit 450 can determine the number of channel state information to be fed back based on the definition of the channel state information.
  • the definition of channel state information can be formulated based on the design requirements of the communication system. The meaning of determining the number of channel state information to be fed back based on the definition of the channel state information is exemplified below.
  • the feedback control unit 230 determines to allow the communication terminal 20 to the primary base station 10A and the base stations 10B and 10C.
  • the channel state information feedback is performed, and the communication terminal 20 is not allowed to perform channel state information feedback to the base station 10D.
  • the communication terminal 20 measures the received signal powers of the primary base station 10A and the base station 10B, the base station 10C, and the base station 10D as S 2 , S 3 , and S 4 , respectively, and the received noise power is N, for example, it can be defined as follows.
  • channel state information is defined as the form of the signal to interference and noise ratio.
  • the channel state information is not limited to this.
  • the channel state information may also be any information that reflects the state of the channel. - - including but not limited to at least one of: a channel state matrix, a rank of a channel state matrix, a multipath delay, a Doppler shift, a rank of a multi-input majority out channel, and a beamforming vector.
  • the channel state information quantity determining unit 450 determines that the number of channel state information to be fed back is
  • the first feedback mode determining unit 460 can determine the feedback mode to be adopted by the communication terminal 20 based on the determined number of channel state information to be fed back. There are currently a number of methods for selecting a feedback mode based on the amount of channel state information to be fed back. In an embodiment in accordance with the present invention, when the number of channel state information to be fed back is less than or equal to a predetermined threshold M, the first feedback mode determining unit 460 determines a single feedback mode as a channel state information feedback mode to be employed by the communication terminal 20.
  • a single feedback method is an instant feedback method or a non-time feedback method. Non-time-division feedback methods such as frequency division multiplexing feedback, code division multiplexing feedback, and other non-time-separated feedback methods.
  • the first feedback mode determining unit 460 determines the feedback mode in which the time division and the non-time division are mixed as the channel state information feedback mode to be adopted by the communication terminal 20.
  • FIG. 5 are diagrams schematically showing an example of a feedback manner in which the channel state information CS1 to CS4 are time-division multiplexed and time-division and non-time-division mixing, respectively, in the above example.
  • the channel state information CS1 to CS4 are fed back in a manner other than time division multiplexing. In this case, although there is no feedback delay, it may result in a significant reduction in the coverage of the PUCCH or PUSCH, even below the acceptable range of the system.
  • the threshold M may be set such that when the number of channel state information requiring feedback is less than or equal to a predetermined threshold M, the PUCCH or PUSCH caused by the non-time division multiplexing feedback mode The coverage is reduced within a range acceptable to the system; when the number of channel state information requiring feedback is greater than a predetermined threshold M, the coverage of the PUCCH or PUSCH caused by the non-time division multiplexing feedback mode is reduced beyond the range acceptable to the system.
  • the value of the threshold M can be determined by pre-system testing to determine the system's coverage tolerance for PUCCH or PUSCH.
  • the first feedback mode determining unit 360 may determine that the channel state information feedback needs to be performed by using a feedback manner of time division and non-time division mixing.
  • the specific manner of feedback can be, for example, as shown in (b) of FIG.
  • the combination of - - and CS4 uses non-time division multiplexing, and the two combinations use time division multiplexing to feedback (here is 2: 2).
  • feedback can also be performed in a 1:3 manner.
  • the channel state information CS1 may be made a single group, and CS2 to CS4 may be time-division multiplexed into one group, and feedback is performed between the two groups by time division multiplexing (not shown).
  • the first feedback mode determining unit 460 may also determine the time division multiplexing feedback mode as the communication terminal when the number of channel state information that needs to be fed back is less than or equal to the predetermined threshold value M. 20 The feedback mode to be used, and when the number of channel state information requiring feedback is greater than the predetermined threshold M, the feedback mode of the time division and the non-time division multiplexing is determined as the feedback mode to be adopted by the communication terminal 20.
  • the predetermined threshold M can be set as follows: When the number of channel state information that needs to be fed back is less than or equal to the predetermined threshold M, the delay caused by the time division feedback mode is Within the acceptable range of the system; when the number of channel state information that needs feedback is greater than a predetermined threshold M, the time delay feedback mode results in a delay that exceeds the acceptable range of the system.
  • the transmitting unit 240 transmits information indicating how to perform channel state information feedback to the communication terminal 20 (user equipment).
  • the information indicating how to perform channel state information feedback may include: a determination result from the feedback control unit 230 that determines which base stations are allowed to feed back channel state information, and the number of channel state information to be fed back from the first feedback mode determining unit 460 Determined reuse feedback method.
  • 20 may broadcast the information communication terminal according to the received control information 10A to 10C feedback channel state base stations CS1 to CS4 0
  • the functions implemented by the channel state information quantity determining unit 450 and the first feedback mode determining unit 460 can be completed in the communication terminal 20.
  • the channel state information number determining unit provided in the communication terminal 20 can determine the number of channel state information to be fed back based on the definition of the known channel state information. Then, the communication terminal 20 is set to determine the feedback mode of the channel state information.
  • the feedback mode determining unit when the number of channel state information to be fed back is less than or equal to a predetermined threshold, causes the wireless communication terminal 20 to feed back channel state information by means of non-time-division feedback; and when the number of channel state information to be fed back is greater than a predetermined threshold The feedback mode determining unit causes the wireless communication terminal 20 to feed back channel state information through a feedback manner of time division and non-time division mixing. Finally, the feedback unit determines the result of the unit according to the feedback manner to request channel state information to each base station.
  • FIG. 6 is a block diagram illustrating a functional configuration of a base station 600 according to another embodiment of the present invention.
  • the base station 600 includes: a channel quality obtaining unit 210, a channel quality determining unit 220, a feedback control unit 230, a sending unit 240, a channel state information quantity determining unit 450, and a first feedback mode determining unit 460.
  • the channel quality obtaining unit 210, the channel quality determining unit 220, the feedback control unit 230, and the transmitting unit 240 have the same structure and function as the corresponding units explained with reference to FIG. 2, and the channel state information quantity determining unit 450 and the first
  • the feedback mode determining unit 460 has the same structure and function as the corresponding cells explained with reference to FIG. 4, and thus, detailed description thereof will be omitted herein.
  • the mixed multiplexing feedback of CS1 to CS4 will include various combinations: for example, CS1 to CS4 are combined in two-times for non-time division multiplexing, between combinations Time division multiplexed 2:2 mode; and three of CS1 to CS4 are time-division multiplexed, and the remaining one is time-division multiplexed 1:3 mode. And, whether it is 2:2 or 1:3, each includes the possibility of multiple combinations. In this case, which combination is used can be determined according to the needs of the system, such as the communication efficiency and the degree of coverage of the PUCCH and PUSCH.
  • the priority setting unit 670 defines the channel state information according to the channel state information. And the uplink channel quality between the communication terminal 20 and each of the cooperative base stations, and the channel state information is prioritized. For example, the priority setting unit 670 can set the priority level to set a higher priority for channel state information more relevant to the channel quality of the good uplink channel.
  • the second feedback mode determining unit 680 determines the feedback multiplexing mode of the channel state information according to the priority set by the priority setting unit 670. For example, the second feedback mode determining unit 680 may determine the feedback multiplexing mode such that the channel state information adopting the time division multiplexing has a higher priority than the channel state information using the non-time division multiplexing, and the time division multiplexing is adopted. Using the feedback channel state information, causing a group to share the same time period of the non-time division multiplexed channel state - The channel state information having a small amount of information has a higher priority than the channel state information having a larger number of non-time division multiplexed channel state information sharing another another period of time.
  • the priority setting unit 670 sets the priority according to the definition of the channel state information (in this example, the signal to interference and noise ratio), and the uplink channel quality between the communication terminal 20 and each of the cooperative base stations, CS1 to CS4.
  • the uplink channel quality between the communication terminal 20 and the cooperative base stations 10A to 10D is Q1 to Q4, and Q1 to Q4 are arranged in descending order.
  • the uplink signal of the base station 10A is superior to the uplink channel quality of the base station 10B
  • the uplink channel quality of the base station 10B is superior to the uplink channel quality of the base station 10C
  • the uplink channel shield of the base station 10C is due to the uplink channel quality of the base station 10D.
  • the uplink channel quality of the base station 10D is the worst, and thus the system's requirements for the demodulation performance of the uplink information cannot be satisfied.
  • the channel state information is not fed back to the base station 10D, and its received signal power S 4 is taken as the interference signal power.
  • CS1 has the highest correlation with the uplink channel of base station 10A.
  • CS1 is only related to the received power S1 of the base station 10A compared to CS2 to CS4 in the case where the interference and noise are constant.
  • the priority setting unit 670 sets the priority of CS1 to the highest priority.
  • CS2 is most relevant to CS3 and CS4.
  • the priority setting unit 670 sets the priority of CS2 to the second priority.
  • CS3 is more relevant than CS4.
  • the priority setting unit 670 sets the priority of CS3 to the third priority.
  • the correlation between CS4 and each base station is weak. Therefore, the priority setting unit 670 sets the priority of CS4 to the lowest priority.
  • the second feedback mode determining unit 680 may determine the feedback multiplexing mode by: causing the channel state information CS1 and CS2 with higher priority to perform non-time division multiplexing reverse request, and lower priority channel state information.
  • CS3 to CS5 perform non-time division multiplexing feedback for a group.
  • the second feedback manner determining unit 680 may determine the multiplexing feedback manner of the channel state information by selecting a predetermined number of channel state information with the lowest priority for non-time division multiplexing feedback, and remaining The channel state information is time-division or non-time-division multiplexed feedback.
  • the predetermined number may be set to: when the number of channel state information that needs to be fed back is less than or equal to the predetermined number, the coverage of the PUCCH or the PUSCH caused by the non-time division multiplexing multi-channel state information feedback is reduced within a range acceptable to the system; When the number of channel state information that needs to be fed back is greater than the predetermined number, the coverage of the PUCCH or PUSCH caused by the non-time division multiplexing multi-channel state information feedback is reduced beyond the range acceptable to the system.
  • the second feedback mode determining unit 680 may determine the multiplexing feedback manner of CS1 to CS4 by: selecting a predetermined number of the lowest priority ( That is, 3) channel state information (ie, CS2 to CS4) performs non-time division multiplexing feedback, and time division multiplexing feedback is performed on the remaining channel state information (ie, CS1).
  • the second feedback mode determining unit 680 may determine the multiplexing feedback manner of CS1 to CS5 by: selecting a predetermined number of the lowest priority (ie, The three channel state information (ie, CS3 to CS5) perform non-time division multiplexing, and perform non-time division multiplexing feedback on the remaining channel state information (ie, CS1 and CS2).
  • priority setting unit 670 and the second feedback mode determining unit 680 are not necessarily based on other units in the embodiment shown in FIG. 6. In fact, the priority setting unit and the second feedback mode determining unit can be constructed independently to implement their functions. Description will be made below with reference to Fig. 7 .
  • FIG. 7 is a block diagram showing a functional configuration of a base station 700 according to an embodiment of the present invention.
  • Base station 700 can be considered as an example of base station 10 in the communication system shown in FIG. As shown in FIG. 7, the base station 700 - - A channel quality acquisition unit 710, a priority setting unit 720, a feedback mode determination unit 730, and a transmission unit 740.
  • the signal acquisition unit 710 acquires the uplink channel quality between the communication terminal 20 and the cooperative base station.
  • the priority setting unit 720 sets a priority for the channel state information based on the definition of the channel state information and the uplink traffic between the communication terminal 20 and each of the cooperative base stations.
  • the priority setting unit 720 can set the priority such that the channel state information more related to the channel channel with better channel shield is set to a higher priority.
  • the feedback mode determining unit 730 determines the feedback multiplexing mode of the channel state information according to the priority set by the priority setting unit 720. And providing the determination result to the transmitting unit 740.
  • the transmitting unit 740 transmits information indicating the determined feedback multiplexing mode to the communication terminal 20.
  • the feedback manner determining unit 730 may determine the feedback multiplexing manner such that the channel state information using the time division multiplexing has a higher priority than the channel state information using the non-time division multiplexing, and the time division multiplexing is adopted. In the case where the channel state information having a small number of channel state information that does not share the same period of time is not higher than the number of channel state information of the other group sharing the other same period of time. The priority of multiple channel state information.
  • the feedback mode determining unit 730 may determine the feedback multiplexing mode by: selecting a predetermined number of channel state information with the lowest priority to perform non-time division multiplexing feedback, and time-dividing the remaining channel state information. Or non-time multiplexed feedback.
  • the "predetermined number" described herein may be set such that when the number of channel state information that needs to be fed back is less than or equal to the predetermined number, the coverage of the PUCCH or PUSCH caused by the non-time division multiplexing multi-channel state information feedback is reduced in the system. Within the range; when the number of channel state information that needs to be fed back is greater than the predetermined number, the coverage of the PUCCH or PUSCH caused by the non-time division multiplexing multi-channel state information feedback is reduced beyond the range acceptable to the system.
  • FIG. 8 is a flow chart showing a method of determining a channel state information feedback multiplexing mode according to an embodiment of the present invention.
  • step S801 the uplink signal between the communication terminal and the cooperative base station is acquired.
  • step S802 priority is set for the channel state information according to the definition of the channel state information and the uplink channel shield between the communication terminal and each of the cooperative base stations. Can be set this way - - Pre-level: For example, channel state information more relevant to the channel with good channel quality is set to a higher priority.
  • step S803 when the communication terminal is to feed back the channel state information in a feedback manner in which the time division is mixed with the time division, the feedback multiplexing mode of the channel state information is determined according to the set priority.
  • the feedback multiplexing mode may be determined as follows: the channel state information using the time division multiplexing has a higher priority than the channel state information using the non-time division multiplexing, and in the channel state information using the non-time division multiplexing feedback, The priority of a group of channel state information having a small number of channel state information sharing non-time division multiplexing sharing the same time period is higher than the priority of channel state information having a larger number of channel state information of another time sharing non-time division multiplexing sharing another same period of time level.
  • step S804 information indicating the determined feedback multiplexing mode is sent to the communication end.
  • FIG. 9 is a block diagram schematically showing a functional configuration of a communication terminal 900 according to an embodiment of the present invention.
  • the communication terminal 900 can be regarded as an example of the communication terminal 20 in the communication system shown in Fig. 1.
  • the communication terminal 900 includes: a channel quality acquisition unit 910, a priority setting unit 920, a feedback mode determination unit 930, and a feedback unit 940.
  • the channel shield acquisition unit 910 acquires the uplink channel quality between the communication terminal and each of the cooperative base stations.
  • the self channel quality acquisition unit 910 can receive information from the base station indicating the quality of the uplink channel between the communication terminal and each of the cooperative base stations.
  • the priority setting unit 920 sets a priority for the channel state information based on the definition of the channel state information and the uplink channel quality between the communication terminal and each of the cooperative base stations.
  • the communication terminal 900 can receive information indicating the definition of the channel state information from the base station.
  • the priority setting unit 920 can set the priority such that the channel state information more relevant to the uplink channel with better channel quality is set to a higher priority.
  • the feedback mode determining unit 930 can determine the feedback multiplexing mode of the channel state information according to the set priority. For example, the feedback mode determining unit 930 may determine the feedback multiplexing mode such that the channel state information adopting the time division multiplexing has a higher priority than the channel state information using the time division multiplexing, and the non-time division multiplexing feedback is adopted.
  • Channel state information such that a group of channel state information sharing a non-time division multiplexed channel state information of the same time period is small -
  • the feedback unit 940 feeds back the channel according to the determination result of the feedback manner determining unit 930.
  • the feedback control unit 230 feeds back to which base stations are allowed to discard without distinguishing between periodic feedback and aperiodic feedback in coordinated multipoint transmission. Status information is controlled. In other embodiments, periodic and aperiodic feedback can be distinguished, and only non-periodic feedback is controlled in the embodiment shown in Figures 2-6. Similarly, the amount of channel state information to be fed back can also be reduced to some extent.
  • the steps of the processing of the base station or the communication terminal of the present disclosure are not necessarily processed in accordance with the timing of the sequence described in the flowchart.
  • the steps of the processing of the open base station or communication terminal may be processed in an order different from that described in the flowchart or in parallel.
  • a computer program that causes hardware (such as a central processing unit (CPU), a read only memory (ROM), and a random access memory (RAM)) installed in a base station or a communication terminal to perform equivalent to The function of the components of the base station or communication terminal.
  • hardware such as a central processing unit (CPU), a read only memory (ROM), and a random access memory (RAM)
  • CPU central processing unit
  • ROM read only memory
  • RAM random access memory
  • a storage medium for storing the calculation sequence is provided.

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Abstract

本公开提供一种基站、无线通信终端、无线通信系统和无线通信方法。基站能够用于协作多点传输,包括:信道质量获取单元,获取用户设备与协作基站之间的上行信道质量;信道质量判断单元,通过将获得的上行信道质量与质量阈值进行比较来判断上行信道质量的优劣;反馈控制单元,根据判断结果确定是否允许用户设备向相应协作基站反馈信道状态信息;及发送单元,将指示如何进行信道状态信息反馈的信息发送给用户设备。当判断结果为上行信道质量优于质量阈值代表的信道质量时,反馈控制单元确定允许用户设备向相应协作基站反馈信道状态信息;当判断结果为差于质量阈值代表的信道质量时,反馈控制单元确定不允许向相应协作基站反馈信道状态信息。

Description

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基站、 无线通信终端、 无线通信系统和无线通信方法
技术领域
[01] 本发明涉及无线通信领域, 尤其涉及一种基站、无线通信终端、无线 通信系统和无线通信方法。
背景技术
[02] 近来, 正在讨论第四代蜂窝系统(4G ) 的引入以实现无线通信的附 加性能的改进。 在 4G中, 诸如协作多点 (CoMP )传输的技术正引起注 意。
[03] 协作多点传输是多个基站彼此协作以与通信终端进行数据通信的技 术。更详细地,协作多点传输指多个基站同时执行与一个通信终端的数据 通信的技术。该技术能够扩大高数据速率通信的覆盖,并有效地解决正交 频分复用 (OFDM )带来的小区之间干扰的问题。
[04] 在进行协作多点传输的无线通信系统中,作为用户设备的无线通信终 端需要向各协作基站反馈能够反映下行信道状态、用于帮助基站确定发送 方案的设计 (协作多点传输点集合、协作多点发送方案、调制编码方案等) 的各种信息和参数。 下文中, 将这种信息和参数统称为信道状态信息。 当 前, 进行协作多点传输的多信道状态信息反馈, 存在两种方案: 一种是多 个信道状态信息采用时分复用 (TDM ) 的方式, 一种是采用其它的诸如 频分复用 (FDM )或码分复用 (CDM ) 的非时分复用方式。
[05] 在时分复用方案中,多个信道状态信息在同一个物理上行链路控制信 道( PUCCH )或物理上行链路共享信道( PUSCH )上传输, 在不同的时 间到达基站端。在非时分复用方案中, 多个信道状态信息采用诸如频分复 用或码分复用的复用方式, 多个信道状态信息同时到达基站端。
发明内容
技术问题
[06] 以时分复用方式反馈信道状态信息的方案和载波聚合(CA ) 中的多 - - 信道状态信息反馈方案相似, 并且对原有标准的改动不大。 然而, 由于信 道状态信息在不同的时刻到达基站端, 该方案可能导致调度时延的问题, 影响多点协作传输的性能。
[07] 采用非时分复用方式反馈信道状态信息的方案允许多个信道状态信 息同时到达基站端, 从而可以避免调度时延的问题。 然而, 随着需要反馈 的信道状态信息的数量增加, PUCCH或 PUSCH的覆盖范围降低。 需要 反馈的信道状态信息的数量越大, PUCCH或 PUSCH的覆盖受到的影响 越严重。
[08] 总的来说, 多信道状态信息反馈涉及到两个重要因素: 调度时延和 PUCCH或 PUSCH覆盖。 上述两种方案在这两个因素中各有优缺点, 没 有在二者间做到令人满意的权衡。
[09] 另外, 当前, 在确定需要反馈信道状态信息的基站时, 都没有考虑上 行信道质量。 事实上, 当上行信道质量较差时, 会严重影响 PUCCH 或 PUSCH的解调性能。
[10] 考虑到以上各问题进行本发明,本发明的目的是提供一种新颖并改进 的基站、无线通信终端、无线通信系统和无线通信方法, 其能够通过考虑 上行信道质量来确定需要向其反馈信道状态信息的基站,并且通过考虑要 反馈的状态信息数量和上行信道质量来确定反馈所使用的具体方式。
解决问题的方案
[11] 采用这种思路来解决上述问题: 首先,可以只对上行信道质量好的基 站反馈信道状态信息; 其次, 在确定需要对其进行反馈的基站之后, 如果 所需反馈的信道状态信息数量较少,可以只采用非时分的反馈方案,如果 反馈的信道状态信息数量较多, 则采用非时分的反馈方案,可能会严重降 低 PUCCH或 PUSCH的覆盖,这时可以采用混合的复用反馈方案;此外, 还可以按照上行信道质量来确定信道状态信息的具体复用反馈方式,对与 信道质量好的上行信道更相关的信道状态信息赋予更高的复用反馈优先 级。
[12] 具体地,根据本发明的一个方面,提供了一种能够用于协作多点传输 的基站, 包括: 信道质量获取单元, 用于获取用户设备与协作基站之间的 上行信道质量;信道质量判断单元,用于通过将获得的上行信道质量与第 一质量阈值进行比较来判断上行信道质量的优劣;反馈控制单元,用于根 据判断结果确定是否允许用户设备向相应协作基站反馈信道状态信息;以 送单元,用于将指示如何进行信道状态信息反馈的信息发送给用户设 备。其中, 当判断结果为上行信道质量优于第一质量阈值代表的信道质量 时, 反馈控制单元确定允许用户设备向相应协作基站反馈信道状态信息; 当判断结果为上行信道质量差于第一质量阈值代表的信道盾量时,反馈控 制单元确定不允许用户设备向相应协作基站反馈信道状态信息。
[13] 此外,根据本发明的一个方面, 提供了一种无线通信系统, 其包括上 述方面中提到的能够用于协作多点传输的基站。
[14] 此外,根据本发明的一个方面,提供了一种用于协作多点传输的无线 通信方法, 包括: 信道质量获取步骤, 获取用户设备与协作基站之间的上 行信道质量;信道盾量判断步骤,通过将获得的上行信道质量与第一质量 阈值进行比较来判断上行信道质量的优劣;反馈控制步骤,根据判断结果 确定是否允许用户设备向相应协作基站反馈信道状态信息; 以及发送步 骤, 将指示如何进行信道状态信息反馈的信息发送给用户设备。 其中, 在 反馈控制步骤中,当判断结果为上行信道质量优于第一质量阈值代表的信 量时,确定允许用户设备向相应协作基站反馈信道状态信息; 当判断 结果为上行信道质量差于第一质量阈值代表的信道质量时,确定不允许用 户设备向相应协作基站反馈信道状态信息。
[15] 此外,根据本发明的一个方面,提供了一种能够用于协作多点传输的 基站, 包括: 信道质量获取单元, 用于获取用户设备与协作基站之间的上 行信道质量;优先级设定单元,用于根据信道状态信息的定义以及用户设 备与每一协作基站之间的上行信道质量, 为信道状态信息设定优先级; 以 馈方式确定单元,用于在用户设备要以时分与非时分混合的反馈方式 反馈信道状态信息时,根据设定的优先级确定信道状态信息的反馈复用方 式; 以及发送单元,用于将指示所确定的反馈复用方式的信息发送给用户 设备。 其中, 优先级设定单元这样设定优先级: 对与信道质量好的上行信 道更相关的信道状态信息设定更高的优先级; 并且其中,反馈方式确定单 元这样确定反馈复用方式:使得采用时分复用的信道状态信息的优先级高 于采用非时分复用的信道状态信息的优先级,而在采用非时分复用反馈的 信道状态信息中,使得一组共用相同时段的非时分复用的信道状态信息数 量少的信道状态信息的优先级高于另一组共用另一相同时段的非时分复 用的信道状态信息数量多的信道状态信息的优先级。
[16] 此外,根据本发明的一个方面, 提供了一种无线通信系统, 其包括紧 挨的上述方面中提到的能够用于协作多点传输的基站。 - -
[17] 此外,根据本发明的一个方面,提供了一种用于协作多点传输的无线 通信方法, 包括: 信道质量获取步骤, 获取用户设备与协作基站之间的上 行信道质量;优先级设定步骤,根据信道状态信息的定义以及用户设备与 每一协作基站之间的上行信道质量, 为信道状态信息设定优先级; 以及反 馈方式确定步骤,在用户设备要以时分与非时分混合的反馈方式反馈信道 状态信息时,根据设定的优先级确定信道状态信息的反馈复用方式; 以及 发送步骤, 将指示所确定的反馈复用方式的信息发送给用户设备。 其中, 在优先级设定步骤中这样设定优先级:对与信道质量好的上行信道更相关 的信道状态信息设定更高的优先级; 并且其中,在反馈方式确定步骤中这 样确定反馈复用方式:使得采用时分复用的信道状态信息的优先级高于采 用非时分复用的信道状态信息的优先级,而在采用非时分复用反馈的信道 状态信息中,使得一组共用相同时段的非时分复用的信道状态信息数量少 的信道状态信息的优先级高于另一组共用另一相同时段的非时分复用的 信道状态信息数量多的信道状态信息的优先级。
[18] 此外,根据本发明的一个方面,提供了一种能够用于协作多点传输的 无线通信终端, 包括: 信道质量获取单元, 用于获取无线通信终端与每一 协作基站之间的上行信 ϋ质量;优先级设定单元,用于才艮据信道状态信息 的定义以及无线通信终端与每一协作基站之间的上行信道盾量,为信道状 态信息设定优先级; 以及反馈方式确定单元,用于在无线通信终端要以时 分与非时分混合的反馈方式反馈信道状态信息时,根据设定的优先级确定 信道状态信息的反馈复用方式; 以及反馈单元,用于根据反馈方式确定单 元的确定结果反馈信道状态信息。其中,优先级设定单元这样设定优先级: 对与信道质量好的上行信道更相关的信道状态信息设定更高的优先级;并 且其中,反馈方式确定单元这样确定反馈复用方式:使得采用时分复用的 信道状态信息的优先级高于采用非时分复用的信道状态信息的优先级,而 在采用非时分复用反馈的信道状态信息中,使得一组共用相同时段的非时 分复用的信道状态信息数量少的信道状态信息的优先级高于另一组共用 另一相同时段的非时分复用的信道状态信息数量多的信道状态信息的优 先级。
[19] 此外,根据本发明的一个方面,提供了一种能够用于协作多点传输的 无线通信终端, 包括: 信道状态信息数量确定单元, 用于基于信道状态信 息的定义来确定要反馈的信道状态信息的数量;反馈方式确定单元,用于 根据所确定的要反馈的信道状态信息的数量来确定信道状态信息的反馈 方式; 以及反馈单元,用于根据反馈方式确定单元的确定结果反馈信道状 - - 态信息, 其中, 当要反馈的信道状态信息的数量大于预定阈值时, 反馈方 方式; 以及当要反馈的信道状态信息的数量小于等于预定阈值时,反請方 式确定单元确定单一反馈方式作为信道状态信息的反馈方式。
发明的有益效果
[20] 如上所述,利用本发明, 能够通过考虑上行信道质量来确定需要反馈 信道状态信息的基站,并且通过考虑要反馈的状态信息数量和上行信道质 量来确定反馈所使用的具体方式。从而,一方面减少了不必要的反馈的开 销; 另一方面, 在多点协作传输系统的调度时延和 PUCCH或 PUSCH覆 盖二者之间做到令人满意的权衡。
附图说明
[21] 图 1是例示根据本发明实施例的通信系统 1的配置的说明图。
图 2是例示根据本发明实施例的基站的功能结构的框图。
图 3是示出根据本发明实施例的信道状态信息反馈的控制方法的流 程图。
图 4是例示根据本发明另一实施例的基站的功能结构的框图。
图 5的( a )和( b )是分别示出对信道状态信息进行非时分复用和时 分与非时分混合复用的反馈方式的示意图。
图 6是例示根据本发明另一实施例的基站的功能结构的框图。
图 7是示出根据本发明实施例的基站的功能结构的框图。
图 8是示出根据本发明实施例的确定信道状态信息反馈复用方式的 方法的流程图。
图 9是示意性示出根据本发明实施例的通信终端的功能结构的框图。
具体实施方式
[22] 下文中, 将参照附图来详细描述本发明的优选实施方式。请注意: 在 本说明书和附图中,使用相同的附图标记来表示具有基本上相同功能和结 构的元件, 并省略重复说明。 - -
[23] 此外,在本说明书和附图中,具有基本上相同功能和结构的多个元件 可以使用不同字母后缀的相同附图标记来彼此区分。 例如, 当需要时, 具 有基本上相同功能和结构的多个元件彼此区分,诸如基站 10A、 10B、 10C 和 10D。然而, 当不需要单独区分基本上具有相同功能和结构的多个元件 时, 仅附有相同的附图标记。 例如, 当不需要特别区分基站 10A、 10B、 10C和 10D时, 简单地称为基站 10。
[24] 首先,将参照图 1来描述根据本发明实施例的通信系统 1的总体配置。
[25] 图 1是例示根据本发明实施例的通信系统 1的配置的说明图。如图 1 所示, 根据本发明实施例的通信系统 1包括多个基站 10和通信终端 20。
[26] 通信终端 20 (用户设备)在基站 10的控制下与基站 10进行通信。 例如,通信终端 20在由基站 10分派的下行链路资源中执行接收处理, 而 在上行链路资源中执行发送处理。
[27] 通信终端 20可以是这样的信息处理装置: 诸如个人计算机 ( PC )、 家用视频处理装置 (DVD 记录器、 录像带记录器等)、 个人数字助理 ( PDA ), 家用游戏机或家用电器。此外, 通信终端 20可以是这样的移动 通信装置: 诸如便携式电话、 个人手持电话系统(PHS )、 便携式音乐播 放装置、 便携式视频处理装置或便携式游戏机。
[28] 基站 10与位于其覆盖内的通信终端 20进行通信。 例如, 基站 10A 可以与位于该基站 10A的覆盖内的通信终端 20A进行通信。在^开中, 描述将在这样的假设下进行: 基站 10是宏小区基站 ( eNodeB ), 但基站 10并不限于宏小区基站。 例如, 基站 10可以是最大发送功率比宏小区基 站小的皮小区 /微小区基站, 或者可以是中继节点或飞小区基站。
[29] 各基站 10之间可以进行数据通信, 以有助于实现协作多点传输。 在 进行协作的各基站中,在停止协作多点传输的通信方式,转而使用传统的 非协作方式进行通信时将为通信终端 20服务的基站被称为主基站。 而主 基站之外的进行协作的各基站将被称为其它基站。下文中将描述的对信道 状态信息反馈的控制中的各个操作可以在主基站中进行,也可以在其它基 站之一中进行, 也可以由主基站以及一个或若干其它基站合作进行。
[30] 接下来, 将参照图 2详细描述根据本发明实施例的基站 200的结构。
[31] 图 2是例示根据本发明实施例的基站 200的功能结构的框图。 基站 200可以是图 1所示通信系统 1中基站 10的实例。 如图 2中所示, 根据 本发明实施例的基站 200包括信道质量获取单元 210、信道质量判断单元 - -
220、 反馈控制单元 230和发送单元 240。
[32] 信道质量获取单元 210获取通信终端 20与协作基站之间的上行信道 质量。信道质量获取单元 210可以采用本领域惯常采用的各种方法来获取 上行信道质量。 例如, 根据经由相应上行信道从通信终端 20接收到的通 信信号(上行信道信号)得到能够指示上行信道质量的参数的值。 例如, 能够指示上行信道质量的参 fci诸如上行接收信号功率、上行接收信号信 干噪比等。
[33] 信道质量判断单元 220通过将由信道质量获取单元 210获得的上行信 道质量与预定的质量阈值 Thl (对应于 "第一质量阈值")进行比较来判 断上行信道质量的优劣。
[34] 可以基于系统的设计要求来设计质量阈值 Thl。在一个例子中,考虑 到当基站接收到反馈的信道状态信息时,如果不能准确地解调该信道状态 信息, 则该反馈将是低效或无效的。 在这种情况下, 没有必要对这种上行 信道质量不好的基站进行信道状态信息反馈。 因而,可以将质量阈值 Thl 设置为: 当上行信道质量优于质量阈值 Thl 所代表的信道质量时, 反馈 的信道状态信息的解调结果能够达到系统要求; 并且, 当上行信 i½量差 于质量阈值 Thl 所代表的信道质量时, 反馈的信道状态信息的解调结果 不能达到系统要求。 具体地, 将阈值 Thl确定为和值才能满足系统解调 性能, 需要预先进行系统测试, 根据测试结果来决定。
[35] 反馈控制单元 230根据信道质量判断单元 220提供的判断结果确定是 否允许通信终端 20向相应的协作基站反馈信道状态信息。 当判断结果为 上行信道质量优于质量阈值 Thl代表的信道质量时, 反馈控制单元 230 确定允许通信终端 20向相应协作基站反馈信道状态信息; 当判断结果为 上行信道质量差于质量阈值 Thl代表的信道质量时, 反馈控制单元 230 确定不允许通信终端 20向相应协作基站反馈信道状态信息。
[36] 发送单元 240将指示如何进行信道状态信息反馈的信息发送给通信 终端 20„ 通信终端 20根据从基站 10接收到的指示如何进行信道状态信 息反馈的信息进行信道状态信息反馈。指示如何进行信道状态信息反馈的 信息可以包括反馈控制单元 230 的确定结果以及以其它方式确定的信道 状态信息的具体反馈方式等。
[37] 上面的实施例中, 基站 200根据通信终端 20与各协作基站之间上行 信道质量的优劣来确定是否允许通信终端 20向相应的基站反馈信道状态 - - 信息。通过选择允许反馈的基站,减少了被反馈信道状态信息的基站的数 量,从而间接地减少了需要反馈的信道状态信息的数量,减少了信道状态 信息反馈占用的通信资源。
[38] 然而,在该实施例中,没有在协作基站中的主基站和协作基站中的其 它基站之间进行区分。在另一个实施例中,例如在图 1所示的通信系统中, 可以将反馈控制单元 230配置为无论通信终端 20与协作基站 10中的主基 站(例如基站 10A )之间的上行信道质量如何, 都允许通信终端 20按照 非协作多点传输下的反馈方式对主基站反馈信道状态信息。换句话说,反 馈控制单元 230可以被配置为无论通信终端 20与协作基站 10中的主基站 10A之间的上行信道质量如何, 始终允许对主基站反馈信道状态信息。这 种配置有利于多点协作与非多点协作之间的切换。例如,在某时刻通信终 端 20处于多点协作的 艮务状态, 然后由于某种原因 (例如通信终端 20 正在向主基站 10A移动), 不再需要多点协作服务, 则可以切换到非多点 协作的状态, 只反馈主基站 10A的信道状态信息。 可见, 无论是在多点 协作还是非多点协作状态, 如果对主基站的相关信息的反馈方式保持不 变, 有利于多点协作与非多点协作之间的切换。
[39] 图 3 是示出根据本发明实施例的信道状态信息反馈的控制方法的流 程图。
[40] 在步骤 S301中,获取通信终端 20与各协作基站之间的上行信道质量。 可以采用本领域惯常采用的各种方法来获取上行信道质量。例如,根据从 通信终端 20接收到的上行信道信号获取能够指示上行信道质量的参数 的值。
[41] 在步骤 S302中, 通过将获得的上行信道质量与预定的质量阈值 Thl 进行比较来判断上行信道质量的优劣。可以基于系统的设计要求来设计质 量阈值 Thl。 例如, 可以将质量阈值 Thl设置为: 当上行信道质量优于 质量阈值 Thl代表的信道质量时, 反馈的信道状态信息的解调结果能够 达到系统要求; 并且, 当上行信 量差于质量阈值 Thl代表的信 量时, 反馈的信道状态信息的解调结果不能达到系统要求。
[42] 接下来, 在步骤 S303中, 根据步骤 S302中的判断结果确定是否允 许通信终端 20向相应协作基站反馈信道状态信息。当在步骤 S302中判断 为上行信道质量优于质量阈值 Thl代表的信道质量时, 确定允许通信终 端 20向相应协作基站反馈信道状态信息。当在步骤 S302中判断为上行信 道质量差于质量阈值 Thl代表的信道质量时, 确定不允许通信终端 20向 - - 相应协作基站反馈信道状态信息。
[43] 在步骤 S304中, 将指示如何进行信道状态信息反馈的信息发送给通 信终端 20, 以控制通信终端 20对相应协作基站进行信道状态信息反馈。 指示如何进行信道状态信息反馈的信息可以包括步骤 S303中的确定结果 以及根据其它方法确定的信道状态信息的具体反馈方式。
[44] 如同参考图 2对基站 200的功能结构的描述,在使用图 3所示的方法 对状态信息反馈进行控制时,也可以考虑区分协作基站中的主机站和其它 基站。 即, 只对其它基站的上行信道质量进行判断, 而针对主基站, 无论 其上行信道质量如何, 都按照非多点协作的方式反馈信道状态信息。
[45] 接下来,将参照图 4描述根据本发明另一实施例的基站 400的功能结 构。相似地,基站 400可以视作图 1所示通信系统中基站 10的具体实例。 图 4是例示根据本发明另一实施例的基站 400的功能结构的框图。
[46] 如图 4所示, 基站 400包括: 信道质量获取单元 210、 信道质量判断 单元 220、 反馈控制单元 230、 发送单元 240、 信道状态信息数量确定单 元 450和第一反馈方式确定单元 460。 其中, 信道质量获取单元 210、 信 量判断单元 220、反馈控制单元 230和发送单元 240与参考图 2所说 明的相应单元具有相同的结构和功能, 在此省略其详细描述。
[47] 信道状态信息数量确定单元 450 可以基于信道状态信息的定义来确 定要反馈的信道状态信息的数量。信道状态信息的定义可以基于通信系统 的设计需求来制定。下面举例说明基于信道状态信息的定义来确定要反馈 的信道状态信息的数量的含义。
[48] 在一个例子中, 假设针对图 1 示出的通信系统中的各多点协作基站 10A、 10B、 10C和 10D, 反馈控制单元 230确定允许通信终端 20对主基 站 10A及基站 10B和 10C进行信道状态信息反馈, 而不允许通信终端 20 对基站 10D进行信道状态信息反馈。 并且, 假设通信终端 20测量到主基 站 10A及基站 10B、基站 10C和基站 10D的接收信号功率分别为 S2、 S3和 S4, 接收噪声功率为 N, 则例如, 可以按下面的方式定义需要反馈 的信道状态信息 CSi:
C51 =— CS2 = ^^ , CS3 = ^^ , CS = Sl + S2 + S3
N + S4 N + S4 N + S4 N + S4
[49] 在本例子中, 信道状态信息被定义为信干噪比的形式。 当然, 信道状 态信息不限于此。 信道状态信息还可以是任何能够反映信道状态的信息, - - 包括但不限于以下中的至少之一: 信道状态矩阵、信道状态矩阵的秩、 多 径时延、 多普勒频偏、 多输入多数出信道的秩, 以及波束成形向量。
[50] 在本例子中,因为基站 10D的上行信道质量较差,因而不对基站 10D 反馈信道状态信息。 即, 基站 10D此刻不参加多点传输的协作。 因而, 将基站 10D的接收信号视作干扰信号。 基于本例这种信道状态信息的定 义,信道状态信息数量确定单元 450确定要反馈的信道状态信息的数量为
4。
[51] 第一反馈方式确定单元 460 可以根据所确定的要反馈的信道状态信 息的数量来确定通信终端 20要采用的反馈方式。 当前存在多种才艮据要反 馈的信道状态信息的数量来选择反馈方式的方法。在根据本发明的一个实 施例中, 当要反馈的信道状态信息的数量小于等于预定阈值 M时, 第一 反馈方式确定单元 460确定单一反馈方式作为通信终端 20要采用的信道 状态信息反馈方式。单一反馈方式即时分反馈方式或非时分反馈方式。非 时分反馈方式诸如是频分复用反馈方式、码分复用反馈方式, 以及其它非 时分反馈方式。 而当要反馈的信道状态信息的数量大于预定阈值 M时, 第一反馈方式确定单元 460确定时分与非时分混合的反馈方式作为通信 终端 20要采用的信道状态信息反馈方式。
[52] 图 5 的 (a )和(b )是分别示意性示出上面例子中对信道状态信息 CS1至 CS4进行非时分复用和时分与非时分混合的反馈方式的例子。 在 图 5的( a )中, 对信道状态信息 CS1至 CS4采用非时分复用的方式进行 反馈。 在这种情况下, 虽然不存在任何反馈时延, 但是可能导致 PUCCH 或 PUSCH的覆盖的显著降低, 甚至降低到系统能接受的范围之外。 考虑 到这一点, 在本发明的一个实施例中, 可以这样来设置阈值 M: 使得当 需要反馈的信道状态信息的数量小于等于预定阈值 M时, 非时分复用反 馈方式导致的 PUCCH或 PUSCH的覆盖降低在系统能接受的范围内; 当 需要反馈的信道状态信息的数量大于预定阈值 M时, 非时分复用反馈方 式导致的 PUCCH或 PUSCH的覆盖降低超出系统能接受的范围。根据这 种设置原则, 可以通过预先的系统测试, 确定系统对 PUCCH或 PUSCH 的覆盖降低容忍度来确定阈值 M的取值。
[53] 假设在本例子中, M取值为 3。 则由于需要反馈的信道状态信息为 4 个, 因而, 第一反馈方式确定单元 360可以确定需要采用时分与非时分混 合的反馈方式进行信道状态信息反馈。 反馈的具体方式可以例如如图 5 的 (b ) 中所示。 信道状态信息 CS1和 CS2的组合、 信道状态信息 CS3 - - 和 CS4的组合分别采用非时分复用的方式, 而这两个组合之间采用时分 复用的方式进行反馈(这里是 2: 2的方式)。 当然, 也可以采用 1: 3的 方式进行反馈。例如,可以使得信道状态信息 CS1独自一组, CS2至 CS4 非时分复用为一组, 两组间通过时分复用进行反馈(未示出)。
[54] 在另一个实施例中, 根据系统的设计, 第一反馈方式确定单元 460 也可以在需要反馈的信道状态信息的数量小于等于预定阈值 M时, 将时 分复用反馈方式确定为通信终端 20要采用的反馈方式, 而在需要反馈的 信道状态信息的数量大于预定阈值 M时, 将时分和非时分复用混合的反 馈方式确定为通信终端 20要采用的反馈方式。 在该实施例下, 考虑到时 分复用反馈将导致的延时, 可以这样来设置预定阈值 M: 当需要反馈的 信道状态信息的数量小于等于预定阈值 M时, 时分反馈方式导致的时延 在系统能接受的范围内;当需要反馈的信道状态信息的数量大于预定阈值 M时, 时分反馈方式导致的时延超出系统能接受的范围。
[55] 在第一反馈方式确定单元 460的确定完成后,发送单元 240将指示如 何进行信道状态信息反馈的信息发送给通信终端 20 (用户设备)。 指示如 何进行信道状态信息反馈的信息可以包括:来自反馈控制单元 230的确定 允许向哪些基站反馈信道状态信息的确定结果,以及来自第一反馈方式确 定单元 460的根据要反馈的信道状态信息的数量确定的复用反馈方式。从 而, 通信终端 20可以通过广播按照接收到的控制信息向基站 10A到 10C 反馈信道状态信息 CS1至 CS40
[56] 这里需要说明的是:信道状态信息数量确定单元 450和第一反馈方式 确定单元 460所实现的功能可以在通信终端 20中完成。 例如, 设置在通 信终端 20中的信道状态信息数量确定单元可以基于已知的信道状态信息 的定义来确定要反馈的信道状态信息的数量。 然后, 设置在通信终端 20 来确定信道状态信息的反馈方式。其中, 当要反馈的信道状态信息的数量 小于等于预定阈值时, 反馈方式确定单元使无线通信终端 20通过非时分 反馈方式反馈信道状态信息;以及当要反馈的信道状态信息的数量大于预 定阈值时, 反馈方式确定单元使无线通信终端 20通过时分与非时分混合 的反馈方式反馈信道状态信息。最后,反馈单元根据反馈方式确定单元的 确定结果向各基站反請信道状态信息。
[57] 即便根据信道状态信息数量选择反馈方式的操作在用户设备端完成, 预定阈值的确定原则也可以与上面描述的原则相同。 这里不再赘述。 - -
[58] 接下来,将参照图 6描述根据本发明另一实施例的基站 600的功能结 构。相似地,基站 600可以视作图 1所示通信系统中基站 10的具体实例。 图 6是例示根据本发明另一实施例的基站 600的功能结构的框图。
[59] 如图 6所示, 基站 600包括: 信道质量获取单元 210、 信道质量判断 单元 220、 反馈控制单元 230、 发送单元 240、 信道状态信息数量确定单 元 450、 第一反馈方式确定单元 460、 优先级设定单元 670和第二反馈方 式确定单元 680。 其中, 信道质量获取单元 210、 信道质量判断单元 220、 反馈控制单元 230和发送单元 240与参考图 2所说明的相应单元具有相同 的结构和功能,并且,信道状态信息数量确定单元 450和第一反馈方式确 定单元 460与参考图 4所说明的相应单元具有相同的结构和功能, 因而, 在此省略对它们的详细描述。
[60] 在上面的例子中, 如果第一反馈方式确定单元 460确定通信终端 20 要采用时分与非时分混合的反馈方式对信道状态信息 CS1至 CS4进行反 馈。 如上所述的, 在例如预定阈值 M = 3的情况下, CS1至 CS4的混合 复用反馈将包括多种组合方式: 例如, CS1至 CS4两两组合进行非时分 复用, 在组合之间进行时分复用的 2: 2方式; 以及 CS1至 CS4中的三个 进行非时分复用, 而与剩余的一个进行时分复用的 1: 3方式。 并且, 无 论是 2: 2方式还是 1: 3方式, 都各自包括多种组合的可能。 在这种情况 下, 采用哪一种组合方式可以才艮据系统的需要诸如对通信效率和 PUCCH 和 PUSCH的覆盖影响程度的考虑来决定。
[61] 在根据图 6所示的实施例中, 尝试根据通信终端 20与协作基站之间 的上行信道的信道质量来确定具体的混合复用方式。在根据本实施例的基 站 600中,优先级设定单元 670在第一反馈方式确定单元 460确定时分与 非时分混合的反馈方式作为通信终端 20要采用的反馈方式时, 根据信道 状态信息的定义以及通信终端 20与每一协作基站之间的上行信道质量, 为信道状态信息设定优先级。例如,优先级设定单元 670可以这样设定优 先级:对与信道质量好的上行信道更相关的信道状态信息设定更高的优先 级。
[62] 接下来,第二反馈方式确定单元 680根据优先级设定单元 670设定的 优先级确定信道状态信息的反馈复用方式。例如,第二反馈方式确定单元 680可以这样确定反馈复用方式: 使得采用时分复用的信道状态信息的优 先级高于采用非时分复用的信道状态信息的优先级,而在采用非时分复用 反馈的信道状态信息中,使得一组共用相同时段的非时分复用的信道状态 - - 信息数量少的信道状态信息的优先级高于另一组共用另一相同时段的非 时分复用的信道状态信息数量多的信道状态信息的优先级。
[63] 下面通过举例来进行说明。 如上面提到的例子, 通信终端 20要反馈 信道状态 CS1至 CS4, 而预定的阈值 M = 3, 则第一反馈方式确定单元确 定时分与非时分混合的反馈方式作为通信终端 20要采用的反馈方式。 这 时,优先级设定单元 670根据信道状态信息的定义(本例中为信干噪比), 以及通信终端 20与每一协作基站之间的上行信道质量为 CS1至 CS4设定 优先级。
[64] 这里,假设通信终端 20与协作基站 10A至 10D之间的上行信道质量 为 Q1至 Q4, 且 Q1至 Q4降序排列。换句话说,基站 10A的上行信 量优于基站 10B的上行信道质量,基站 10B的上行信道质量优于基站 10C 的上行信道质量, 且基站 10C的上行信道盾量由于基站 10D的上行信道 质量。 如上面提到的, 基站 10D的上行信道质量最差, 因而无法满足系 统对上行信息解调性能的要求。 因而, 不对基站 10D反馈信道状态信息, 并且将其接收信号功率 S4作为干扰信号功率。
[65] 从 CS1至 CS4的定义式
C51 =— CS2 = ^^, CS3 = ^^, CS = Sl + S2 + S3
N + S4 N + S4 N + S4 N + S4 可知: CS1与基站 10A的上行信道的相关性最大。 事实上, 在干扰和噪 声不变的情况下,与 CS2至 CS4相比, CS1只与基站 10A的接收功率 S1 相关。 因而, 优先级设定单元 670将 CS1的优先级设为最高优先级。 以 此类推, 对于基站 10B的上行信道, 相比于 CS3和 CS4, CS2与之最相 关。 因而, 优先级设定单元 670将 CS2的优先级设为第二优先级。 对于 基站 10C的上行信道, 相比于 CS4, CS3与之更相关。 因而, 优先级设 定单元 670将 CS3的优先级设为第三优先级。 而 CS4与各基站的相关性 都较弱。 因此, 优先级设定单元 670将 CS4的优先级设为最低优先级。
[66] 接下来,在本实施例中,第二反馈方式确定单元 680根据优先级设定 单元 670设定的优先级确定信道状态信息的反馈复用方式。 例如, 对于 CS1至 CS4, 由于 CS1具有最高优先级, 且阈值 M = 3, 即系统可以容忍 三个信道状态信息非时分复用的情况,第二反馈方式确定单元 680可以这 样确定反馈复用方式: 使得 CS1采用时分复用的方式进行反馈, 而 CS2 - - 至 CS4采用非时分复用的方式进行反馈。 当然, 也可以采用 CS1至 CS4 两两组合的 2: 2方式, 这时, 第二反馈方式确定单元 680可以确定任何 一种组合方式进行反請。
[67] 在另外一个例子中, 可能存在 5个信道状态信息 CS1至 CS5, 且它 们的优先级降序排列, 且预定阈值 M = 3。 这时, 第二反馈方式确定单元 680 可以这样确定反馈复用方式: 使得优先级更高的信道状态信息 CS1 和 CS2为一组进行非时分复用反請, 而优先级较低的信道状态信息 CS3 至 CS5为一组进行非时分复用反馈。
[68] 在一个实施例中,第二反馈方式确定单元 680可以这样确定信道状态 信息的复用反馈方式:选择优先级最低的预定数量个信道状态信息进行非 时分的复用反馈, 而对剩余的信道状态信息进行时分或非时分的复用反 馈。 这里, 预定数量可以被设置为: 当需要反馈的信道状态信息的数量小 于等于该预定数量时,非时分复用多信道状态信息反馈导致的 PUCCH或 PUSCH的覆盖降低在系统能接受的范围内; 当需要反馈的信道状态信息 的数量大于该预定数量时, 非时分复用多信道状态信息反馈导致的 PUCCH或 PUSCH的覆盖降低超出系统能接受的范围。
[69] 例如对于上述信道状态信息为 CS1至 CS4,预定阈值 M = 3的例子, 第二反馈方式确定单元 680可以这样确定 CS1至 CS4的复用反馈方式: 选择优先级最低的预定数量个(即 3个)信道状态信息(即 CS2至 CS4 ) 进行非时分的复用反馈, 而对剩余的信道状态信息(即 CS1 )进行时分复 用反馈。
[70] 对于上述信道状态信息为 CS1至 CS5, 预定阈值 M = 3的例子, 第 二反馈方式确定单元 680可以这样确定 CS1至 CS5的复用反馈方式: 选 择优先级最低的预定数量个(即 3个)信道状态信息(即 CS3至 CS5 ) 进行非时分的复用反請, 并对剩余的信道状态信息(即 CS1和 CS2 )进 行非时分的复用反馈。
[71] 这里需要说明的是: 优先级设定单元 670和第二反馈方式确定单元 680的构造和实现不必基于图 6所示实施例中的其它单元。 事实上, 可以 独立地构造优先级设定单元和第二反馈方式确定单元, 以实现它们的功 能。 下面参考图 7进行说明。
[72] 图 7是示出根据本发明实施例的基站 700的功能结构的框图。 基站 700可以视作图 1所示通信系统中基站 10的实例。如图 7所示,基站 700 - - 包括: 信道质量获取单元 710、 优先级设定单元 720、 反馈方式确定单元 730和发送单元 740。
[73] 信 量获取单元 710获取通信终端 20与协作基站之间的上行信道 质量。 优先级设定单元 720根据信道状态信息的定义以及通信终端 20与 每一协作基站之间的上行信 量, 为信道状态信息设定优先级。 其中, 优先级设定单元 720可以这样设定优先级:对与信道盾量好的上行信道更 相关的信道状态信息设定更高的优先级。 然后, 在通信终端 20要以时分 与非时分混合的反馈方式反馈信道状态信息时, 反馈方式确定单元 730 才艮据优先级设定单元 720设定的优先级确定信道状态信息的反馈复用方 式, 并将确定结果提供给发送单元 740。 发送单元 740将指示确定的反馈 复用方式的信息发送给通信终端 20。
[74] 反馈方式确定单元 730可以这样确定反馈复用方式:使得采用时分复 用的信道状态信息的优先级高于采用非时分复用的信道状态信息的优先 级, 而在采用非时分复用的情况下, 4吏得一组共用相同时段的非时分复用 的信道状态信息数量少的信道状态信息的优先级高于另一组共用另一相 同时段的非时分复用的信道状态信息数量多的信道状态信息的优先级。
[75] 在一个实施例中, 反馈方式确定单元 730 可以这样确定反馈复用方 式: 选择优先级最低的预定数量个信道状态信息进行非时分的复用反馈, 而对剩余的信道状态信息进行时分或非时分的复用反馈。这里所述的 "预 定数量"可以这样设置: 当需要反馈的信道状态信息的数量小于等于该预 定数量时,非时分复用多信道状态信息反馈导致的 PUCCH或 PUSCH的 覆盖降低在系统能接受的范围内;当需要反馈的信道状态信息的数量大于 该预定数量时, 非时分复用多信道状态信息反馈导致的 PUCCH 或 PUSCH的覆盖降低超出系统能接受的范围。
[76] 具体实现的例子可以参见在对图 6的实施例的说明中引用的例子,这 里不再进行详细描述。
[77] 图 8是示出根据本发明实施例的确定信道状态信息反馈复用方式的 方法的流程图。
[78] 如图 8中所示, 在步骤 S801中, 获取通信终端与协作基站之间的上 行信 量。
[79] 在步骤 S802中, 根据信道状态信息的定义以及通信终端与每一协作 基站之间的上行信道盾量, 为信道状态信息设定优先级。可以这样设定优 - - 先级: 例如,对与信道质量好的上行信道更相关的信道状态信息设定更高 的优先级。
[80] 在步骤 S803中, 在通信终端要以时分与非时分混合的反馈方式反馈 信道状态信息时, 根据设定的优先级确定信道状态信息的反馈复用方式。 例如,可以这样确定反馈复用方式: 采用时分复用的信道状态信息的优先 级高于采用非时分复用的信道状态信息的优先级,而在采用非时分复用反 馈的信道状态信息中,一组共用相同时段的非时分复用的信道状态信息数 量少的信道状态信息的优先级高于另一组共用另一相同时段的非时分复 用的信道状态信息数量多的信道状态信息的优先级。
[81] 在步骤 S804中, 将指示所确定的反馈复用方式的信息发送给通信终 o
[82] 此外, 需要说明的是: 上述为信道状态信息设定优先级, 并依据优先 级来确定具体反馈复用方式的功能也可以在用户设备端完成。下面参考图 9进行说明。
[83] 图 9是示意性示出根据本发明实施例的通信终端 900的功能结构的框 图。 通信终端 900可以视作图 1所示通信系统中通信终端 20的实例。 如 图 9所示, 通信终端 900包括: 信道质量获取单元 910、 优先级设定单元 920、 反馈方式确定单元 930和反馈单元 940。
[84] 信道盾量获取单元 910获取通信终端与每一协作基站之间的上行信 道质量。例如, 自行信道质量获取单元 910可以从基站接收指示通信终端 与每一协作基站之间的上行信道质量的信息。
[85] 优先级设定单元 920根据信道状态信息的定义以及通信终端与每一 协作基站之间的上行信道质量, 为信道状态信息设定优先级。 通信终端 900 可以从基站接收指示信道状态信息的定义的信息。 优先级设定单元 920可以这样设定优先级: 对与信道质量好的上行信道更相关的信道状态 信息设定更高的优先级。
[86] 在无线通信终端要以时分与非时分混合的反馈方式反馈信道状态信 息时,反馈方式确定单元 930可以根据设定的优先级确定信道状态信息的 反馈复用方式。例如,反馈方式确定单元 930可以这样确定反馈复用方式: 使得采用时分复用的信道状态信息的优先级高于采用非时分复用的信道 状态信息的优先级, 而在采用非时分复用反馈的信道状态信息中,使得一 组共用相同时段的非时分复用的信道状态信息数量少的信道状态信息的 - - 优先级高于另一组共用另一相同时段的非时分复用的信道状态信息数量 多的信道状态信息的优先级。
[87] 最后,反馈单元 940才艮据反馈方式确定单元 930的确定结果反馈信道
Figure imgf000019_0001
[88] 此外,返回结合图 2至图 6说明的各实施例,反馈控制单元 230在不 区分协作多点传输中的周期性反馈和非周期性反馈的情况下,对允许向哪 些基站反馈信道状态信息进行控制。在另外的实施例中,可以对周期性和 非周期性反馈进行区分,只对非周期性反馈进行如图 2至图 6所示实施例 中的控制。 同样, 也可以在一定程度上减小要反馈的信道状态信息数量。
[89] 以上参照附图详细描述了本发明的优选实施例,同时当然本公开的技 术范围并不限于上述示例。本领域的技术人员可以在所附权利要求的范围 内得到各种替换和修改, 而应当理解的是, 所述各种替换和修改自然落在 开的技术范围内。
[90] 例如,本公开的基站或通信终端的处理的步骤不必按照根据流程图所 描述的顺序的时序来处理。例如, 开的基站或通信终端的处理的步骤 可以按照不同于流程图所描述的顺序的顺序或并行地来处理。
[91] 此外,可以创建一种计算机程序,该计算机程序使安装在基站或通信 终端中的硬件(诸如中央处理器(CPU )、 只读存储器(ROM )和随机存 储器(RAM ) )执行等同于基站或通信终端的部件的功能。 此外, 还 提供一种存储该计算^ f呈序的存储介盾 o

Claims

权利 要求 书
1. 一种基站, 能够用于协作多点传输, 包括:
信道质量获取单元,用于获取用户设备与协作基站之间的上行信道质 量;
信道质量判断单元,用于通过将获得的上行信道质量与第一质量阈值 进行比较来判断所述上行信道质量的优劣;
反馈控制单元,用于根据判断结果确定是否允许所述用户设备向相应 协作基站反馈信道状态信息; 以及
发送单元,用于将指示如何进行信道状态信息反馈的信息发送给所述 用户设备,
其中,当所述判断结果为所述上行信道质量优于所述第一质量阈值代 表的信道质量时,反馈控制单元确定允许所述用户设备向相应协作基站反 馈信道状态信息;当所述判断结果为上行信道质量差于所述第一质量阈值 代表的信道质量时,反馈控制单元确定不允许所述用户设备向相应协作基 站反馈信道状态信息。
2.根据权利要求 1所述的基站, 其中, 所述第一质量阈值被设置为: 当上行信 量优于所述第一质量阈值代表的信 量时,反馈的信道状 态信息的解调结果达到系统要求, 并且, 当上行信道质量差于所述第一质 量阈值代表的信道质量时,反馈的信道状态信息的解调结果不能达到系统 要求。
3.根据权利要求 1或 2所述的基站, 其中, 所述反馈控制单元被配 置为无论所述用户设备与协作基站中的主基站之间的上行信 量如何, 都允许所述用户设备按照非协作多点传输下的反馈方式对主基站反馈信 道状态信息。
4.根据权利要求 1至 3中任一个所述的基站, 还包括:
信道状态信息数量确定单元,用于基于信道状态信息的定义来确定要 反馈的信道状态信息的数量; 以及
第一反馈方式确定单元,用于根据所确定的要反馈的信道状态信息的 数量来确定所述用户设备要采用的反馈方式。
5.根据权利要求 4所述的基站, 其中,
当要反馈的信道状态信息的数量大于预定阈值时,第一反馈方式确定 单元确定时分与非时分混合的反馈方式作为所述用户设备要采用的反馈 方式; 以及
当要反馈的信道状态信息的数量小于等于预定阈值时,第一反馈方式 确定单元确定单一反馈方式作为所述用户设备要采用的反馈方式。
6.根据权利要求 5所述的基站, 其中, 当要反馈的信道状态信息的 数量小于等于预定阈值时,第一反馈方式确定单元确定非时分反馈方式作 为所述用户设备要采用的反馈方式, 其中, 所述预定阈值被设置为: 当需 要反馈的信道状态信息的数量小于等于所述预定阈值时,非时分复用反馈 方式导致的物理上行链路控制信道或物理上行链路共享信道的覆盖降低 在系统能接受的范围内;当需要反馈的信道状态信息的数量大于所述预定 阈值时,非时分复用反馈方式导致的物理上行链路控制信道或物理上行链 路共享信道的覆盖降低超出系统能接受的范围。
7.根据权利要求 5所述的基站, 其中, 当要反馈的信道状态信息的 数量小于等于预定阈值时,第一反馈方式确定单元确定时分反馈方式作为 所述用户设备要采用的反馈方式, 其中, 所述预定阈值被设置为: 当需要 反馈的信道状态信息的数量小于等于所述预定阈值时,时分反馈方式导致 的时延在系统能接受的范围内;当需要反馈的信道状态信息的数量大于所 述预定阈值时, 时分反馈方式导致的时^ ¾出系统能接受的范围。
8.根据权利要求 5至 7中任一个所述的基站, 还包括:
优先级设定单元,用于在所述第一反馈方式确定单元确定时分与非时 分混合的反馈方式作为所述用户设备要采用的反馈方式时,根据所述信道 状态信息的定义以及所述用户设备与每一协作基站之间的上行信道质量, 为所述信道状态信息设定优先级; 以及
第二反馈方式确定单元,用于根据设定的优先级确定所述信道状态信 息的反馈复用方式,
其中, 所述优先级设定单元这样设定优先级:对与信道质量好的上行 信道更相关的信道状态信息设定更高的优先级; 并且
其中, 所述第二反馈方式确定单元这样确定反馈复用方式:使得采用 时分复用反馈的信道状态信息的优先级高于采用非时分复用反馈的信道 状态信息的优先级, 而在采用非时分复用反馈的信道状态信息中,使得一 组共用相同时段的非时分复用的信道状态信息数量少的信道状态信息的 优先级高于另一组共用另一相同时段的非时分复用的信道状态信息数量 多的信道状态信息的优先级。
9.根据权利要求 8所述的基站, 其中, 所述第二反馈方式确定单元 这样确定反馈复用方式:选择优先级最低的预定数量个信道状态信息进行 非时分的复用反馈,而对剩余的信道状态信息进行时分或非时分的复用反 馈; 其中, 所述预定数量被设置为: 当需要反馈的信道状态信息的数量小 于等于所述预定数量时,非时分复用反馈方式导致的物理上行链路控制信 道或物理上行链路共享信道的覆盖降低在系统能接受的范围内;当需要反 馈的信道状态信息的数量大于所述预定数量时,非时分复用反馈方式导致 的物理上行链路控制信道或物理上行链路共享信道的覆盖降低超出系统 能接受的范围。
10.根据权利要求 1所述的基站, 其中, 所述反馈控制单元只对是否 允许所述用户设备向相应协作基站进行信道状态信息的非周期性反馈进 行确定。
11.根据权利要求 1至 10中任一个所述的基站, 其中, 所述信道状 态信息是能够反映信道状态的信息, 包括: 信道的信干噪比、信道状态矩 阵、信道状态矩阵的秩、多径时延、多普勒频偏、多输入多数出信道的秩, 以及波束成形向量中的至少之一。
12. 一种无线通信系统, 包括能够用于协作多点传输的基站, 所述基站包括:
信道质量获取单元,用于获取用户设备与协作基站之间的上行信道质 量;
信道质量判断单元,用于通过将获得的上行信道质量与第一质量阈值 进行比较来判断所述上行信道质量的优劣;
反馈控制单元,用于根据判断结果确定是否允许所述用户设备向相应 协作基站反馈信道状态信息; 以及
发送单元,用于将指示如何进行信道状态信息反馈的信息发送给所述 用户设备, 其中,当所述判断结果为所述上行信道质量优于所述第一质量阈值代 表的信道质量时,反馈控制单元确定允许所述用户设备向相应协作基站反 馈信道状态信息;当所述判断结果为上行信道质量差于所述第一质量阈值 代表的信道质量时,反馈控制单元确定不允许所述用户设备向相应协作基 站反馈信道状态信息。
13. 一种无线通信方法, 用于协作多点传输, 包括:
信道质量获取步骤, 获取用户设备与协作基站之间的上行信道质量; 信道质量判断步骤,通过将获得的上行信道质量与第一质量阈值进行 比较来判断所述上行信道质量的优劣;
反馈控制步骤,根据判断结果确定是否允许所述用户设备向相应协作 基站反馈信道状态信息; 以及
发送步骤,将指示如何进行信道状态信息反馈的信息发送给所述用户 设备,
其中,在所述反馈控制步骤中, 当判断结果为所述上行信道质量优于 所述第一质量阈值代表的信道质量时,确定允许所述用户设备向相应协作 基站反馈信道状态信息;当判断结果为上行信道质量差于所述第一质量阈 值代表的信道质量时,确定不允许所述用户设备向相应协作基站反馈信道
^^态 ^息。
14. 一种基站, 能够用于协作多点传输, 包括:
信道质量获取单元,用于获取用户设备与协作基站之间的上行信道质 量;
优先级设定单元,用于根据所述信道状态信息的定义以及所述用户设 备与每一协作基站之间的上行信道盾量, 为所述信道状态信息设定优先 级; 以及
反馈方式确定单元,用于在用户设备要以时分与非时分混合的反馈方 式反馈信道状态信息时,根据设定的优先级确定所述信道状态信息的反馈 复用方式; 以及
发送单元,用于将指示所确定的反馈复用方式的信息发送给所述用户 设备,
其中, 所述优先级设定单元这样设定优先级:对与信道质量好的上行 信道更相关的信道状态信息设定更高的优先级; 并且 其中, 所述反馈方式确定单元这样确定反馈复用方式:使得采用时分 复用的信道状态信息的优先级高于采用非时分复用的信道状态信息的优 先级, 而在采用非时分复用反馈的信道状态信息中, 4吏得一组共用相同时 段的非时分复用的信道状态信息数量少的信道状态信息的优先级高于另 一组共用另一相同时段的非时分复用的信道状态信息数量多的信道状态 信息的优先级。
15.根据权利要求 14所述的基站, 其中, 所述反馈方式确定单元这 样确定反馈复用方式:选择优先级最低的预定数量个信道状态信息进行非 时分的复用反馈, 而对剩余的信道状态信息进行时分或非时分的复用反 馈; 其中,
所述预定数量被设置为:当需要反馈的信道状态信息的数量小于等于 所述预定数量时,非时分复用多信道状态信息反馈导致的物理上行链路控 制信道或物理上行链 享信道的覆盖降低在系统能接受的范围内;当需 要反馈的信道状态信息的数量大于所述预定数量时,非时分复用多信道状 态信息反馈导致的物理上行链路控制信道或物理上行链路共享信道的覆 盖降低超出系统能接受的范围。
16. 一种无线通信系统, 包括能够用于协作多点传输的基站, 所述基站包括:
信道质量获取单元,用于获取用户设备与协作基站之间的上行信道质 量;
优先级设定单元,用于根据所述信道状态信息的定义以及所述用户设 备与每一协作基站之间的上行信道质量, 为所述信道状态信息设定优先 级; 以及
反馈方式确定单元,用于在用户设备要以时分与非时分混合的反馈方 式反馈信道状态信息时,根据设定的优先级确定所述信道状态信息的反馈 复用方式; 以及
发送单元,用于将指示所确定的反馈复用方式的信息发送给所述用户 设备,
其中, 所述优先级设定单元这样设定优先级:对与信道质量好的上行 信道更相关的信道状态信息设定更高的优先级; 并且
其中, 所述反馈方式确定单元这样确定反馈复用方式:使得采用时分 复用的信道状态信息的优先级高于采用非时分复用的信道状态信息的优 先级, 而在采用非时分复用反馈的信道状态信息中, 4吏得一组共用相同时 段的非时分复用的信道状态信息数量少的信道状态信息的优先级高于另 一组共用另一相同时段的非时分复用的信道状态信息数量多的信道状态 信息的优先级。
17. 一种无线通信方法, 用于协作多点传输, 包括:
信道质量获取步骤, 获取用户设备与协作基站之间的上行信道质量; 优先级设定步骤,根据所述信道状态信息的定义以及所述用户设备与 每一协作基站之间的上行信 量, 为所述信道状态信息设定优先级; 以 及
反馈方式确定步骤,在用户设备要以时分与非时分混合的反馈方式反 馈信道状态信息时,根据设定的优先级确定所述信道状态信息的反馈复用 方式; 以及
发送步骤, 将指示所确定的反馈复用方式的信息发送给所述用户设 备,
其中,在所述优先级设定步骤中这样设定优先级:对与信道质量好的 上行信道更相关的信道状态信息设定更高的优先级; 并且
其中,在所述反馈方式确定步骤中这样确定反馈复用方式:使得采用 时分复用的信道状态信息的优先级高于采用非时分复用的信道状态信息 的优先级, 而在采用非时分复用反馈的信道状态信息中,使得一组共用相 同时段的非时分复用的信道状态信息数量少的信道状态信息的优先级高 于另一组共用另一相同时段的非时分复用的信道状态信息数量多的信道 状态信息的优先级。
18. 一种无线通信终端, 能够用于协作多点传输, 包括:
信道质量获取单元,用于获取所述无线通信终端与每一协作基站之间 的上行信道质量;
优先级设定单元,用于才艮据所述信道状态信息的定义以及所述无线通 信终端与每一协作基站之间的上行信道质量,为所述信道状态信息设定优 先级; 以及
反馈方式确定单元,用于在无线通信终端要以时分与非时分混合的反 馈方式反馈信道状态信息时,根据设定的优先级确定所述信道状态信息的 反馈复用方式; 以及
反馈单元,用于根据所述反馈方式确定单元的确定结果反馈信道状态 信息,
其中, 所述优先级设定单元这样设定优先级:对与信道质量好的上行 信道更相关的信道状态信息设定更高的优先级; 并且
其中, 所述反馈方式确定单元这样确定反馈复用方式:使得采用时分 复用的信道状态信息的优先级高于采用非时分复用的信道状态信息的优 先级, 而在采用非时分复用反馈的信道状态信息中, 4吏得一组共用相同时 段的非时分复用的信道状态信息数量少的信道状态信息的优先级高于另 一组共用另一相同时段的非时分复用的信道状态信息数量多的信道状态 信息的优先级。
19. 一种无线通信终端, 能够用于协作多点传输, 包括:
信道状态信息数量确定单元,用于基于信道状态信息的定义来确定要 反馈的信道状态信息的数量;
反馈方式确定单元,用于根据所确定的要反馈的信道状态信息的数量 来确定信道状态信息的反馈方式; 以及
反馈单元,用于根据所述反馈方式确定单元的确定结果反馈信道状态 信息, 其中,
当要反馈的信道状态信息的数量大于预定阈值时,反馈方式确定单元 确定时分与非时分混合的反馈方式作为信道状态信息的反馈方式; 以及 当要反馈的信道状态信息的数量小于等于预定阈值时,反馈方式确定 单元确定单一反馈方式作为信道状态信息的反馈方式。
20.根据权利要求 19所述的无线通信终端, 其中, 当要反馈的信道 状态信息的数量小于等于预定阈值时,所述反馈方式确定单元确定非时分 反馈方式作为信道状态信息的反馈方式, 其中, 所述预定阈值被设置为: 当需要反馈的信道状态信息的数量小于等于所述预定阈值时,非时分复用 反馈方式导致的物理上行链路控制信道或物理上行链路共享信道的覆盖 降低在系统能接受的范围内;当需要反馈的信道状态信息的数量大于所述 预定阈值时,非时分复用反馈方式导致的物理上行链路控制信道或物理上 行链路共享信道的覆盖降低超出系统能接受的范围。
21.根据权利要求 19所述的无线通信终端, 其中, 当要反馈的信道 状态信息的数量小于等于预定阈值时,所述反馈方式确定单元确定时分反 馈方式作为信道状态信息的反馈方式, 其中, 所述预定阈值被设置为: 当 需要反馈的信道状态信息的数量小于等于所述预定阈值时,时分反馈方式 导致的时延在系统能接受的范围内;当需要反馈的信道状态信息的数量大 于所述预定阈值时, 时分反馈方式导致的时延超出系统能接受的范围。
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