WO2011020317A1 - 一种秩自适应方法及装置 - Google Patents

一种秩自适应方法及装置 Download PDF

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Publication number
WO2011020317A1
WO2011020317A1 PCT/CN2010/070888 CN2010070888W WO2011020317A1 WO 2011020317 A1 WO2011020317 A1 WO 2011020317A1 CN 2010070888 W CN2010070888 W CN 2010070888W WO 2011020317 A1 WO2011020317 A1 WO 2011020317A1
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WIPO (PCT)
Prior art keywords
rank
receiving window
equal
ranks
state
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PCT/CN2010/070888
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English (en)
French (fr)
Inventor
谭源春
彭佛才
刘利平
李宪玺
刘娟娟
历亮
Original Assignee
中兴通讯股份有限公司
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 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP10809450.9A priority Critical patent/EP2469919B1/en
Priority to US13/258,557 priority patent/US8755810B2/en
Priority to JP2012525028A priority patent/JP2013502768A/ja
Publication of WO2011020317A1 publication Critical patent/WO2011020317A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/56Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/563Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/02Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • 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
    • H04B7/063Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/21Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network

Definitions

  • the present invention relates to the field of communications, and in particular, to a rank adaptation method and apparatus.
  • Multi-input Multi-output (MIMO) technology uses multiple input streams
  • N s is the value determined by the correlation of the MIMO channel, the greater the correlation of the MIMO channel, the smaller the value N s; the greater the smaller the correlation of the MIMO channel, the value N s.
  • LTE Long Term Evolution
  • N s is called Rank on the User Equipment (UE) side
  • Layer is called Layer on the network side.
  • a simple rank adaptation process is a method in which the network side controls the number of independent channels for transmitting downlink data according to the latest reported rank (N s ) of the UE side.
  • this method can make the network side adapt well to the rank change of the MIMO channel, but when the rank of the MIMO channel changes rapidly (for example, the UE is in a high-speed mobile state), the network side uses The newly reported rank of the UE side may be significantly different from the rank of the current actual MIMO channel, which may result in a significant reduction in the spatial advantage of MIMO.
  • the technical problem to be solved by the present invention is to provide a rank adaptation method and apparatus, which adaptively updates the rank value and improves the throughput rate of the MIMO channel.
  • the present invention provides a rank adaptation method, including: The base station receives the rank reported by the user equipment by using the rank receiving window, and the base station determines the rank of the current time according to the distribution state of each rank in the rank receiving window of the current time, and determines, according to the rank of the current time, that it is sent to the user equipment.
  • the number of independent channels of downlink data including:
  • the above method is in the step of determining the rank of the current time:
  • the base station uses the latest reported rank of the user equipment in the rank-receiving window as the current moment.
  • the distribution of ranks in the rank receiving window satisfies the following conditions:
  • the ranks in the rank receiving window are successively X and continuous. y, where the values of X and y differ by 1, and the number of y is greater than or equal to the number of X; or
  • the distribution of ranks in the rank receiving window satisfies the following conditions:
  • the ranks in the rank receiving window are successively consecutive x, continuous y, and continuous z, where the values of X, y, z are sequentially different.
  • the value of 1, X, y, z is incremented or decremented sequentially, and the total number of y and z is greater than or equal to the number of X, and the number of z is greater than or equal to the number of y.
  • the above method is in the step of determining the rank of the current time:
  • the state three means that the ranks in the rank receiving window are consecutive X and one y,
  • the absolute value of the difference between y and X is m, m is greater than or equal to 1 and less than or equal to N maxS -l , and N m ⁇ is the minimum of the number of receiving antennas and the number of transmitting antennas; the base station further determines:
  • the latest reported rank in the rank receiving window is used as the rank of the current time; when the difference between y and X is greater than 0 and the user equipment is located at the edge of the cell to which it belongs, 1 is used as the rank of the current time. ;
  • x+1 is taken as the rank of the current time.
  • the above method is in the step of determining the rank of the current time:
  • the state four means that the ranks in the rank receiving window are consecutive X and y, x is not equal to y, the number of y is less than the number of ⁇ , and the number of y is greater than or equal to n, n is greater than or equal to 2; the base station further determines:
  • the latest reported rank in the rank receiving window is used as the rank of the current time;
  • the value of y is greater than or equal to X and the user equipment is located at the edge of the cell to which it belongs, 1 is taken as the rank of the current time;
  • the latest reported rank in the rank receiving window is taken as the rank of the current time.
  • the user equipment is located at the edge of the cell to which the reference signal received by the user equipment is less than or equal to the reference signal received power of the cell set by the system; the user equipment is not located at the edge of the cell.
  • the reference signal received power of the cell to which the user equipment reports is greater than the reference signal received power threshold of the belonging cell.
  • the above method is in the step of determining the rank of the current time:
  • the base station takes the smallest rank in the rank receiving window as the rank of the current moment
  • the state five refers to the minimum number of receiving antennas and the number of transmitting antennas.
  • the distribution of ranks in the rank receiving window satisfies the following conditions:
  • the ranks in the rank receiving window are sequentially alternating X and y. Sequence, the value of y differs from the value of X by 1; or
  • N m ⁇ 8 equal distribution of the rank receiving each rank in the window satisfies the following conditions: rank receiving a rank within the window including the X and y and the value does not exist consecutive X and y, y values of X differ 1 or 2, Alternatively, the ranks within the rank reception window include x, y, and z, and one of x, y, and z is adjacent to the remaining two.
  • the above method is in the step of determining the rank of the current time:
  • the number of ranks in the rank receiving window is greater than the threshold A and the minimum number of receiving antennas and the number of transmitting antennas N m ⁇ is greater than or equal to 2 and less than or equal to 3 and the distribution state of each rank in the rank receiving window at the current time When state one, state two, state three, and state four are not satisfied, 1 is taken as the rank of the current time; State 1 means that the ranks of the ranks in the rank receiving window have the same value;
  • State 2 means that the distribution of ranks in the rank receiving window satisfies the following conditions:
  • the ranks in the rank receiving window are successive X and continuous y, wherein the values of X and y differ by 1, and the number of y is greater than or equal to X. Number
  • State 3 means that the ranks in the rank receiving window are successively X and one y, and the absolute value of the difference between y and X is m, m is greater than or equal to 1 and less than or equal to N maxS -l ;
  • State 4 means that the ranks in the rank receiving window are consecutive X and y, X is not equal to y, the number of y is less than the number of X, and the number of y is greater than or equal to n, and n is greater than or equal to 2.
  • the above method is in the step of determining the rank of the current time:
  • the number of ranks in the rank receiving window is greater than the threshold A and the minimum number of receiving antennas and the number of transmitting antennas N maxS is greater than or equal to 4 and the distribution state of each rank in the rank receiving window at the current time does not satisfy the state 1.
  • the base station uses the smallest rank in the rank receiving window as the rank of the current time;
  • State 1 means that the ranks of the ranks in the rank receiving window have the same value
  • State 2 means that when N m ⁇ is greater than or equal to 4 and less than or equal to 7, the distribution of ranks in the rank receiving window satisfies the following conditions:
  • the ranks in the rank receiving window are successively continuous X and continuous y, and the values of X and y are different.
  • the distribution of ranks in the rank receiving window satisfies the following condition: the ranks in the rank receiving window are successively consecutive x, continuous y, and continuous z, where the values of X, y, and z are in turn, and the values of X, y, and z are sequentially incremented or decremented, and the total number of y and z is greater than or equal to the number of X, and the number of z is greater than Equal to the number of y;
  • State 3 means that the ranks in the rank receiving window are successively X and one y, and the absolute value of the difference between y and X is m, m is greater than or equal to 1 and less than or equal to N maxS -l ;
  • State 4 means that the ranks in the rank receiving window are consecutive X and y, X is not equal to y, the number of y is less than the number of X, and the number of y is greater than or equal to n, and n is greater than or equal to 2;
  • State 5 means that when N m ⁇ is greater than or equal to 4 and less than or equal to 7, the distribution of ranks in the rank receiving window satisfies the following conditions:
  • the rank in the rank receiving window is an alternating sequence of X and y, and the value of y and the value of X
  • the distribution of each rank in the rank receiving window satisfies the following conditions:
  • the rank in the rank receiving window includes X and y and there is no continuous X and y, and the value of y differs from the value of x. or 2, or, the ranks in the rank receiving window include x, y, and z and one of x, y, and z is adjacent to the remaining two.
  • the above method is in the step of determining the rank of the current time:
  • the base station uses the smallest rank in the rank receiving window as the rank of the current time.
  • the threshold A is an integer greater than or equal to 3.
  • the present invention provides a rank adaptation apparatus, including: a connected rank receiving unit and a rank decision unit;
  • the rank receiving unit is configured to receive the rank reported by the user equipment by using a rank receiving window, and send the rank to the rank determining unit;
  • the rank determining unit is configured to determine a rank of the current time according to a distribution state of each rank in the rank receiving window of the current time, and determine, according to the rank of the current moment, the number of independent channels used to send downlink data to the user equipment. .
  • the above device may also have the following features:
  • the rank determining unit is further configured to: when the number of ranks in the rank receiving window is greater than the threshold A and the distribution state of each rank in the rank receiving window of the current moment is the state 2, the user equipment in the rank receiving window is updated. The reported rank is taken as the rank of the current moment;
  • the state 2 is: when the minimum number of receiving antennas and the number of transmitting antennas N m ⁇ is greater than or equal to 2 and less than or equal to 7, the distribution of ranks in the rank receiving window satisfies the following conditions: Rank in the rank receiving window In order of continuous X and continuous y, wherein the values of X and y differ by 1, and the number of y is greater than or equal to the number of X; or
  • the distribution of ranks in the rank receiving window satisfies the following conditions:
  • the ranks in the rank receiving window are successively consecutive x, continuous y, and continuous z, where the values of X, y, z are sequentially different.
  • the value of 1, X, y, z is incremented or decremented sequentially, and the total number of y and z is greater than or equal to the number of X, and the number of z is greater than or equal to the number of y.
  • the above apparatus further includes user equipment location measurement connected to the rank decision unit Unit, where
  • the user equipment location measuring unit is configured to measure whether the user equipment is located at a side of the cell to which the user belongs.
  • the rank determining unit is further configured to: determine that the number of ranks in the rank receiving window is greater than the threshold A and each of the rank receiving windows of the current moment
  • state three means that the ranks in the rank receiving window are consecutive X and one y, and the absolute value of the difference between y and X is m, m is greater than or equal to 1 and less than or equal to N maxS -l , N m ⁇ refers to the minimum of the number of receiving antennas and the number of transmitting antennas; further:
  • the latest reported rank in the rank receiving window is used as the rank of the current moment
  • the user equipment location measurement unit learns whether the user equipment is located at the edge of the cell to which the user belongs, and determines the rank of the current time according to the location of the user equipment: the user equipment is located in the cell to which the user equipment belongs. For the edge of the current time, 1 is taken as the rank of the current time; when the user equipment is not located at the edge of the cell to which it belongs, x+1 is taken as the rank of the current time.
  • the foregoing apparatus further includes a user equipment location measurement unit connected to the rank determination unit, where
  • the user equipment location measuring unit is configured to measure whether the user equipment is located at a side of the cell to which the user belongs.
  • the rank determining unit is further configured to: determine that the number of ranks in the rank receiving window is greater than the threshold A and each received in the rank receiving window When the rank distribution state is state four, state four means that the ranks in the rank receiving window are consecutive X and y, X is not equal to y, the number of y is less than the number of X, and the number of y is greater than or equal to n. , n is greater than or equal to 2; further:
  • the latest reported rank in the rank receiving window is used as the rank of the current time.
  • the value of y is greater than or equal to X, it is learned from the user equipment location measuring unit whether the user equipment is located at the edge of the cell to which the cell belongs. And determining the rank of the current time according to the location of the user equipment: when the user equipment is located at the edge of the cell to which the user equipment is located, 1 is used as the rank of the current time; when the user equipment is not located at the edge of the cell to which the user equipment is located, the latest report is sent in the rank receiving window. The rank is taken as the rank of the current moment.
  • the rank decision unit is further configured to determine that the number of ranks in the rank receiving window is greater than the threshold A and the distribution state of the ranks received in the rank receiving window is state five, and the smallest rank in the rank receiving window is taken as the current The rank of time
  • the distribution of ranks in the rank receiving window satisfies the following conditions:
  • the ranks in the rank receiving window are X and The alternating sequence of y, the value of y differs from the value of X by 1; or ⁇ is equal to 8, the distribution of ranks within the rank reception window satisfies the following conditions:
  • the rank within the rank reception window includes X and y and there is no continuous X sum
  • the value of y, y differs from the value of X by 1 or 2
  • the rank within the rank receiving window includes x, y, and z, and one of x, y, and z is adjacent to the remaining two.
  • the present invention can reasonably predict the change of the rank of the MIMO channel to better utilize the MIMO channel resources for data transmission and improve the throughput of the MIMO channel.
  • FIG. 1 is a block diagram showing the structure of a rank adaptive device of the present invention
  • FIG. 2 is a process flow diagram of a rank adaptation method of the present invention
  • FIG. 3 is a process flow of a rank receiving window in a rank adaptation method and apparatus of the present invention.
  • the rank adaptation apparatus of the present invention includes a rank decision unit, a rank receiving unit respectively connected to the rank decision unit, and a user equipment location measuring unit;
  • the rank receiving unit is configured to receive the rank reported by the user equipment through the rank receiving window, and send the rank to the rank determining unit;
  • the user equipment location measurement unit is configured to measure whether the user equipment is located at an edge of the cell to which the user equipment belongs.
  • the user equipment is located at the edge of the cell to which the user equipment reports that the reference signal received by the user equipment is less than or equal to the cell to which the system is located.
  • the reference signal receiving power threshold is not included; the user equipment is not located at the edge of the cell to which the reference signal received by the user equipment is greater than the reference signal receiving power threshold of the cell to which the system is set.
  • the rank determining unit is configured to determine a rank of the current time according to a distribution state of each rank in the rank receiving window of the current time, and determine, according to the rank of the current moment, the number of independent channels used to send downlink data to the user equipment.
  • the rank receiving unit judges the distribution state of each rank received in the rank receiving window
  • the judging method used is the same as that described in the rank adaptive method described below.
  • the rank adaptation method includes the following steps:
  • Step 201 The base station receives the rank reported by the user equipment by using a rank receiving window.
  • the rank receiving window length can be defined by a fixed length or by a multiple of the reporting period of the fixed receiving rank.
  • the value of Trank is 50ms to 1000ms, or N times of the reporting period of the rank, and the value of N ranges from 3 to 12 integers.
  • the length of the rank accepting window is defined as 200 ms or 3 rank reporting periods.
  • the length of the rank receiving window may be determined according to the minimum number of receiving antennas and the number of transmitting antennas. The larger the value of N m ⁇ , the larger the length value of the rank receiving window.
  • the processing flow of the rank receiving window is as shown in FIG. 3.
  • the reporting period of the rank is 4 transmission time intervals ( ⁇ ), and N is set to 4, that is, the length of the rank receiving window is 12 TTIs, and the rank is The receiving window slides with time as the axis.
  • Fig. 3 shows that when the current time is Ta, the ranks received in the rank receiving window include rank1, rank2, rank3, and rank4, respectively.
  • the rank received in the rank receiving window includes rank3, rank4, rank5, and rank6.
  • Step 202 The base station determines the rank of the current time according to the distribution state of each rank in the rank receiving window of the current time, and determines the number of independent channels used for sending the downlink data to the user equipment according to the rank of the current moment.
  • Determining the rank of the current time according to the distribution state of each rank received in the rank receiving window specifically includes the following cases:
  • State one (or called steady state) means that the ranks of the ranks in the rank receiving window are the same; in state one, the latest reported rank in the rank receiving window is taken as the rank of the current moment.
  • State 2 means that when N maxS is greater than or equal to 2 and less than or equal to 7, the distribution of ranks within the rank receiving window satisfies the following conditions:
  • the ranks in the rank receiving window are successively X and consecutive y ⁇ x,...,x,y...,y ⁇ , the values of x and y differ by 1, where ⁇ l,...,N max , and the number of y is greater than or equal to the number of X;
  • N When m ⁇ is equal to 8, the distribution of ranks in the rank receiving window satisfies the following conditions:
  • the ranks in the rank receiving window are successively a plurality of consecutive Xs and a plurality of consecutive ys and a plurality of consecutive zs, that is, ⁇ x,..., x, y,...,y,z,...,z ⁇ , where x,y,ze ⁇ ,---,N wxS ⁇ , x, y, z have a value of 1,
  • State three means that the distribution of ranks within the rank receiving window satisfies the following conditions:
  • the ranks in the rank receiving window are successively a plurality of consecutive Xs and one y, and the absolute value of the difference between y and X is m, x , ⁇ e ⁇ l,---,N max5 ⁇ , l ⁇ m ⁇ N maxS -U
  • state three when the difference between y and x is less than 0 (indicating that the mutation direction of the rank is decreasing), the rank is received.
  • the latest reported rank in the window is used as the rank of the current time; when the difference between y and X is greater than 0 (indicating that the direction of the rank is increased) and the user equipment is located at the edge of the cell to which it belongs, 1 is taken as the rank of the current time; y and X When the difference is greater than 0 and the user equipment is not located at the edge of the cell to which it belongs, x+1 is taken as the rank of the current time.
  • State four means that the distribution of ranks within the rank receiving window satisfies the following conditions:
  • the ranks in the rank receiving window are successively a plurality of consecutive Xs and a plurality of consecutive ys, ie ⁇ ... ⁇ ... ⁇ , x,_y e ⁇ l,...,N maxS ⁇ , X is not equal to y, the number of y is less than the number of X, and the number of y is greater than or equal to n, n is greater than or equal to 2;
  • state four when the value of y is less than X (indicating that the shear direction of the rank is decreasing), the latest reported rank in the rank receiving window is taken as the rank of the current time; the value of y is greater than or equal to X (indicating that the direction of the rank is When the user equipment is located at the edge of the cell to which it belongs, 1 is taken as the current time; if the value of y is greater than or equal to X and the user equipment is not located at the following conditions:
  • the reference signal received power (Reference Signal Received Power, RSRP for short) reported by the user equipment is used for the determination. For example, when the RSRP of the cell to be reported by the user equipment is less than or equal to the RSRP threshold a, it is determined that the user equipment is located at the cell edge; when the reference signal received power of the cell to which the user equipment reports is greater than the RSRP threshold a, the user equipment is determined. Not at the edge of the cell to which it belongs.
  • the distribution of ranks in the rank receiving window satisfies the following conditions:
  • the ranks in the rank receiving window are sequentially alternating orders of X and y
  • the rank includes X and y and there are no consecutive X and y, x ⁇ e ⁇ l, ---, N max5 ⁇ , the value of y differs from the value of x by 1 or 2, or the rank within the rank reception window includes x , y and z and one of x, y and z is adjacent to the remaining two, x, _y, ze ⁇ l, ..., N maxS ⁇ .
  • state five
  • the distribution state of each rank received in the rank receiving window is not any one of the above states 1 to 5, and the distribution state of each rank received in the rank receiving window is considered to be a hopping state.
  • the smallest rank in the rank reception window is taken as the rank of the current time.
  • N is greater than or equal to 2 and less than or equal to 3, it is determined that the distribution state of each rank in the rank receiving window does not satisfy the state one, two, three, and four, and no longer judges whether it is state five or state six, and directly takes 1 as the current moment. Rank.
  • N m ⁇ is 2, that is, the rank value fed back by the UE is 1 or 2.
  • the threshold m used to determine whether the rank is a mutation is 1, and the rank is judged. Whether it is the shear value of the threshold n is 2.
  • the RSRP of the cell in which the UE is reported is used to determine whether the UE is at the edge of the cell, and the threshold a is 10.
  • the rank in the rank receiving window is ⁇ 1, 1, 1, 1 ⁇ , and it is judged that the rank satisfies the stable condition, and the latest reported rank of the UE is scheduled to be 1.
  • the rank in the rank receiving window is ⁇ 1, 1, 2, 2 ⁇ .
  • the condition that the rank does not satisfy the stability is judged, and the condition that the slow change is satisfied is further determined. Therefore, the latest reported rank of the UE is 2 scheduling.
  • the rank in the rank receiving window is ⁇ 1, 1, 1, 2 ⁇ , and it is first determined that the rank does not satisfy the condition of stable or slow change; further determining that the rank is a mutation, further determining that the user equipment is located at the edge of the belonging cell , 1 is taken as the rank of the current time.
  • the rank in the rank receiving window is ⁇ 1, 1, 2, 1 ⁇ , and the condition that the rank does not satisfy the stable or slow change is first determined; further, the condition that the rank does not satisfy the mutation is further determined; further, the rank is not sheared; Then, the minimum rank in the rank receiving window is 1 for scheduling.
  • the rank in the rank receiving window is ⁇ 1, 2, 2, 1 ⁇ , and the condition that the rank does not satisfy the stable or slow change is first determined; further, the condition that the rank does not satisfy the mutation is further determined; further, the rank is not sheared; Then, the minimum rank in the rank receiving window is 1 for scheduling.
  • the rank in the rank receiving window is ⁇ 1, 2, 1, 1 ⁇ , and the condition that the rank does not satisfy the stable or slow change is first determined; further, the condition that the rank does not satisfy the mutation is further determined; further, the rank is not sheared; Then, the minimum rank in the rank receiving window is 1 for scheduling.
  • N m ⁇ is 4, that is, the rank value fed back by the UE is 1, 2, 3 or 4.
  • the threshold m for judging whether the rank is a mutation is 2, and the threshold n for determining whether the rank is a shear is 2.
  • the RSRP of the cell in which the UE is reported is used to determine whether the UE is at the edge of the cell, and the threshold a is 10.
  • the rank in the rank-receiving window is ⁇ 2, 2, 2, 2 ⁇ , and it is judged that the rank satisfies the stable condition, and the latest reported rank is 2 for the UE.
  • the rank in the rank receiving window is ⁇ 2, 2, 3, 3 ⁇ , and it is first judged that the rank does not satisfy the stable condition; further, the condition that the rank satisfies the slow change is judged. Therefore, the rank is the latest reported rank of 3 for scheduling.
  • the rank in the rank receiving window is ⁇ 3, 3, 3, 1 ⁇ , first judge the condition that the rank does not satisfy the stability; further judge the condition that the rank does not satisfy the slow change; further judge the condition that the rank satisfies the mutation; further It is determined that the mutation direction of the rank reported by the UE is a decrease; therefore, the latest reported rank of the UE is 1 for scheduling.
  • the rank in the rank receiving window is ⁇ 2, 2, 2, 4 ⁇ , first judge that the rank does not satisfy the condition of stability; further judge that the rank does not satisfy the condition of slow change; further judge the condition that the rank satisfies the mutation; further It is determined that the abrupt direction of the rank reported by the UE is increased; the RSRP of the cell reported by the UE is 5, and the UE is further determined to be at the edge of the cell in which the UE is located. Therefore, the rank is 1 for scheduling.
  • the above method can reasonably predict the change of the rank of the MIMO channel, so as to better utilize the MIMO channel resource for data transmission and improve the throughput of the MIMO channel.
  • the present invention provides a rank adaptation method and apparatus.
  • the base station determines the rank of the current time according to the distribution state of each rank in the rank receiving window at the current time, and reasonably predicts the rank change of the MIMO channel to better utilize the MIMO channel. Resources for data transfer.

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Abstract

本发明公开了一种秩自适应方法及装置,所述方法包括:基站通过秩接收窗口接收用户设备上报的秩,所述基站根据当前时刻的秩接收窗口中各秩的分布状态确定当前时刻的秩,并根据此当前时刻的秩确定用于向所述用户设备发送下行数据的独立信道的个数。 本发明可以合理地预测MIMO信道的秩的变化, 以更好地利用MIMO信道资源进行数据传输, 提高MIMO信道的吞吐率。

Description

一种秩自适应方法及装置
技术领域
本发明涉及通信领域, 具体涉及一种秩自适应方法及装置。
背景技术
多输入多输出 ( Multi-input Multi-output, 简称 MIMO )技术是使用多个
( Ντ )发射天线和多个( NR )接收天线的无线传输技术, 它可以有效地提高 无线网络的容量和链路传输性能。 由 N个发射天线和 NR个接收天线形成的 MIMO信道(用矩阵 表示)可以分解为 Ns个独立信道, Ns的取值范围 为 [Hax , 其中, WmaxS = min{ ,^}。 Ns的取值由该 MIMO信道的相关性决 定, MIMO信道的相关性越大, Ns 取值越小; MIMO信道的相关性越小, Ns 取值越大。 在长期演进 ( Long Term Evolution, 简称 LTE ) 系统中 , 在用户设 备(User Equipment, 简称 UE )侧将 Ns称为 Rank (秩) , 在网络侧把 ^称 为 Layer (层) 。
MIMO技术的实现途径主要有两种: 空间分集和空间复用。 在 LTE系统 中, 对于空间复用方式, UE需要向网络侧反馈 MIMO信道的秩, 网络侧依 据 UE反馈的秩, 进行 Rank自适应处理。 一种简单的秩自适应处理是网络侧 根据 UE侧最新上报的秩( Ns )来控制进行下行数据的发送的独立信道的个 数。 当 MIMO信道的秩变化緩慢时, 这种方法能够使得网络侧很好地自适应 MIMO信道的秩变化, 但当 MIMO信道的秩变化较快(例如 UE处于高速移 动状态 ) 时, 网络侧釆用 UE侧最新上报的秩可能与当前实际的 MIMO信道 的秩差别较大, 这样会导致 MIMO的空间优势大打折扣。
发明内容
本发明要解决的技术问题是提供一种秩自适应方法及装置, 自适应更新 秩的值, 提高 MIMO信道的吞吐率。
为了解决上述技术问题, 本发明提供一种秩自适应方法, 包括: 基站通过秩接收窗口接收用户设备上报的秩, 所述基站根据当前时刻的 秩接收窗口中各秩的分布状态确定当前时刻的秩, 并根据此当前时刻的秩确 定用于向所述用户设备发送下行数据的独立信道的个数。
进一步地, 上述方法在确定当前时刻的秩的步骤中:
秩接收窗口内的秩的个数大于阔值 A并且当前时刻的秩接收窗口中各秩 的分布状态为状态二时, 所述基站将秩接收窗口内所述用户设备最新上报的 秩作为当前时刻的秩;
其中, 状态二是指:
接收天线个数和发射天线个数中的最小值 Nm ^大于等于 2且小于等于 7 时, 秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内的秩依次为连续 的 X和连续的 y, 其中, X和 y的值相差 1 , y的个数大于等于 X的个数; 或
Wm ^等于 8时, 秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内 的秩依次为连续的 x、 连续的 y和连续的 z , 其中, X, y, z的值依次差值为 1 , X, y, z的值依次递增或递减, 且 y和 z的总个数大于等于 X的个数, z 的个数大于等于 y的个数。
进一步地, 上述方法在确定当前时刻的秩的步骤中:
秩接收窗口内的秩的个数大于阔值 A并且当前时刻的秩接收窗口中各秩 的分布状态为状态三时, 状态三是指秩接收窗口内的秩依次为连续的 X和一 个 y, y与 X相差的绝对值为 m, m大于等于 1且小于等于 NmaxS-l , Nm ^指接 收天线个数和发射天线个数中的最小值; 所述基站进一步判断:
y与 X的差值小于 0时,将秩接收窗口内最新上报的秩作为当前时刻的秩; y与 X的差值大于 0且用户设备位于所属小区的边缘时,将 1作为当前时 刻的秩;
y与 X的差值大于 0且用户设备不位于所属小区的边缘时, 将 x+1作为 当前时刻的秩。
进一步地, 上述方法在确定当前时刻的秩的步骤中:
秩接收窗口内的秩的个数大于阔值 A并且当前时刻的秩接收窗口中各秩 的分布状态为状态四时, 状态四是指秩接收窗口内的秩依次为连续的 X和 y, x不等于 y, y的个数小于 χ的个数, 且 y的个数大于等于 n, n大于等于 2; 所述基站进一步判断:
y的值小于 X时, 将秩接收窗口内最新上报的秩作为当前时刻的秩; y的值大于等于 X且用户设备位于所属小区的边缘时,将 1作为当前时刻 的秩;
y的值大于等于 X且用户设备不位于所属小区的边缘时, 将秩接收窗口 内最新上报的秩作为当前时刻的秩。
进一步地, 上述方法中,
所述用户设备位于所属小区边缘是指所述用户设备上报的所属小区的参 考信号接收功率小于等于系统设置的所属小区的参考信号接收功率阔值; 所述用户设备不位于所属小区边缘是指所述用户设备上报的所属小区的 参考信号接收功率大于所述所属小区的参考信号接收功率阔值。
进一步地, 上述方法在确定当前时刻的秩的步骤中:
秩接收窗口内的秩的个数大于阔值 A并且当前时刻的秩接收窗口中各秩 的分布状态为状态五时, 所述基站将秩接收窗口内最小的秩作为当前时刻的 秩;
状态五指接收天线个数和发射天线个数中的最小值 ^大于等于 2且小 于等于 7时, 秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内的秩依 次为 X和 y的交替序列, y的值与 X的值相差 1; 或
Nm ^等于 8时, 秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内 的秩包括 X和 y并且不存在连续的 X和 y , y的值与 X的值相差 1或 2, 或者, 秩接收窗口内的秩包括 x、 y和 z,并且 x、 y和 z中的一个均与其余两个相邻。
进一步地, 上述方法在确定当前时刻的秩的步骤中:
秩接收窗口内的秩的个数大于阔值 A并且接收天线个数和发射天线个数 中的最小值 Nm ^大于等于 2且小于等于 3并且当前时刻的秩接收窗口中各秩 的分布状态不满足状态一、 状态二、 状态三和状态四时, 将 1作为当前时刻 的秩; 状态一是指秩接收窗口内各秩的值相同;
状态二是指秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内的秩 依次为连续的 X和连续的 y, 其中, X和 y的值相差 1 , y的个数大于等于 X 的个数;
状态三是指秩接收窗口内的秩依次为连续的 X和一个 y, y与 X相差的绝 对值为 m, m大于等于 1且小于等于 NmaxS-l ;
状态四是指秩接收窗口内的秩依次为连续的 X和 y, X不等于 y, y的个 数小于 X的个数, 且 y的个数大于等于 n, n为大于等于 2。
进一步地, 上述方法在确定当前时刻的秩的步骤中:
秩接收窗口内的秩的个数大于阔值 A并且接收天线个数和发射天线个数 中的最小值 NmaxS大于等于 4并且当前时刻的秩接收窗口中各秩的分布状态不 满足状态一、 状态二、 状态三、 状态四和状态五时, 所述基站将秩接收窗口 内最小的秩作为当前时刻的秩;
状态一是指秩接收窗口内各秩的值相同;
状态二是指 Nm ^大于等于 4且小于等于 7时, 秩接收窗口内各秩的分布 满足以下条件: 秩接收窗口内的秩依次为连续的 X和连续的 y, X和 y的值相 差 1 , 且 y的个数大于等于 X的个数; 或^ ^等于 8时, 秩接收窗口内各秩 的分布满足以下条件:秩接收窗口内的秩依次为连续的 x、连续的 y和连续的 z , 其中, X, y, z的值依次差值为 1 , X, y, z的值依次递增或递减, 且 y和 z的总个数大于等于 X的个数, z的个数大于等于 y的个数;
状态三是指秩接收窗口内的秩依次为连续的 X和一个 y, y与 X相差的绝 对值为 m, m大于等于 1且小于等于 NmaxS-l ;
状态四是指秩接收窗口内的秩依次为连续的 X和 y, X不等于 y, y的个 数小于 X的个数, 且 y的个数大于等于 n, n为大于等于 2;
状态五是指 Nm ^大于等于 4且小于等于 7时, 秩接收窗口内各秩的分布 满足以下条件: 秩接收窗口内的秩依次为 X和 y的交替序列, y的值与 X的 值相差 1 ; 或^^等于 8时, 秩接收窗口内各秩的分布满足以下条件: 秩接 收窗口内的秩包括 X和 y并且不存在连续的 X和 y, y的值与 x的值相差 1或 2 , 或者, 秩接收窗口内的秩包括 x、 y和 z并且 x、 y和 z中的一个均与其余 两个相邻。
进一步地, 上述方法在确定当前时刻的秩的步骤中:
秩接收窗口内的秩的个数小于阔值 A时, 所述基站将秩接收窗口内最小 的秩作为当前时刻的秩。
进一步地, 上述方法中:
所述阔值 A为大于等于 3的整数。
为了解决上述技术问题, 本发明提供一种秩自适应装置, 包括: 相连的 秩接收单元和秩判决单元;
所述秩接收单元设置成通过秩接收窗口接收用户设备上报的秩, 并发送 至秩判决单元;
所述秩判决单元设置成根据当前时刻的秩接收窗口中各秩的分布状态确 定当前时刻的秩, 并根据此当前时刻的秩确定用于向所述用户设备发送下行 数据的独立信道的个数。
进一步地, 上述装置还可具有以下特点:
所述秩判决单元还设置成判断秩接收窗口内的秩的个数大于阔值 A并且 当前时刻的秩接收窗口中各秩的分布状态为状态二时, 将秩接收窗口内所述 用户设备最新上报的秩作为当前时刻的秩;
其中, 状态二是指: 接收天线个数和发射天线个数中的最小值 Nm ^大于等于 2且小于等于 7 时, 秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内的秩依次为连续 的 X和连续的 y, 其中, X和 y的值相差 1 , y的个数大于等于 X的个数; 或
Wm ^等于 8时, 秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内 的秩依次为连续的 x、 连续的 y和连续的 z , 其中, X, y, z的值依次差值为 1 , X, y, z的值依次递增或递减, 且 y和 z的总个数大于等于 X的个数, z 的个数大于等于 y的个数。
进一步地, 上述装置还包括与所述秩判决单元相连的用户设备位置测量 单元, 其中,
所述用户设备位置测量单元设置成测量用户设备是否位于所属小区的边 所述秩判决单元还设置成: 判断秩接收窗口内的秩的个数大于阔值 A并 且当前时刻的秩接收窗口中各秩的分布状态为状态三时, 状态三是指秩接收 窗口内的秩依次为连续的 X和一个 y , y与 X相差的绝对值为 m, m大于等于 1 且小于等于 NmaxS-l , Nm ^指接收天线个数和发射天线个数中的最小值; 进 一步:
判断 y与 X的差值小于 0时, 将秩接收窗口内最新上报的秩作为当前时 刻的秩;
判断 y与 X的差值大于 0时, 从所述用户设备位置测量单元获知用户设 备是否位于所属小区的边缘的信息, 并根据所述用户设备的位置确定当前时 刻的秩: 用户设备位于所属小区的边缘时, 将 1作为当前时刻的秩; 用户设 备不位于所属小区的边缘时, 将 x+1作为当前时刻的秩。
进一步地, 上述装置还包括与所述秩判决单元相连的用户设备位置测量 单元, 其中,
所述用户设备位置测量单元设置成测量用户设备是否位于所属小区的边 所述秩判决单元还设置成: 判断秩接收窗口内的秩的个数大于阔值 A并 且秩接收窗口中接收到的各秩的分布状态为状态四时, 状态四是指秩接收窗 口内的秩依次为连续的 X和 y , X不等于 y , y的个数小于 X的个数, 且 y的 个数大于等于 n, n为大于等于 2; 进一步:
判断 y的值小于 X时,将秩接收窗口内最新上报的秩作为当前时刻的秩; 判断 y的值大于等于 X时, 从所述用户设备位置测量单元获知用户设备 是否位于所属小区的边缘的信息, 并根据所述用户设备的位置确定当前时刻 的秩: 用户设备位于所属小区的边缘时, 将 1作为当前时刻的秩; 用户设备 不位于所属小区的边缘时,将秩接收窗口内最新上报的秩作为当前时刻的秩。
进一步地, 上述装置还可具有以下特点: 所述秩判决单元还设置成判断秩接收窗口内的秩的个数大于阔值 A并且 秩接收窗口中接收到的各秩的分布状态为状态五时, 将秩接收窗口内最小的 秩作为当前时刻的秩;
状态五指: 接收天线个数和发射天线个数中的最小值 Nm ^大于等于 2且 小于等于 7时, 秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内的秩 依次为 X和 y的交替序列, y的值与 X的值相差 1 ; 或 ^等于 8时, 秩接收 窗口内各秩的分布满足以下条件: 秩接收窗口内的秩包括 X和 y并且不存在 连续的 X和 y, y的值与 X的值相差 1或 2, 或者, 秩接收窗口内的秩包括 x、 y和 z , 并且 x、 y和 z中的一个均与其余两个相邻。
本发明可以合理地预测 MIMO信道的秩的变化,以更好地利用 MIMO信 道资源进行数据传输, 提高 MIMO信道的吞吐率。 附图概述
图 1是本发明秩自适应装置的结构组成框图;
图 2是本发明秩自适应方法的处理流程图;
图 3是本发明秩自适应方法及装置中秩接收窗口的处理流程。
本发明的较佳实施方式
如图 1所示, 本发明中秩自适应装置包括秩判决单元, 分别与秩判决单 元相连的秩接收单元、 用户设备位置测量单元;
秩接收单元设置成通过秩接收窗口接收用户设备上报的秩, 并发送至秩 判决单元;
所述用户设备位置测量单元设置成测量用户设备是否位于所属小区的边 缘; 所述用户设备位于所属小区边缘是指所述用户设备上报的所属小区的参 考信号接收功率小于等于系统设置的所属小区的参考信号接收功率阔值; 所 述用户设备不位于所属小区边缘是指所述用户设备上报的所属小区的参考信 号接收功率大于系统设置的所属小区的参考信号接收功率阔值。 所述秩判决单元设置成根据当前时刻的秩接收窗口中各秩的分布状态确 定当前时刻的秩, 并根据此当前时刻的秩确定用于向所述用户设备发送下行 数据的独立信道的个数; 还设置成判断秩接收窗口中接收到的各秩的分布状 态为状态三或状态四时, 从所述用户设备位置测量单元获得用户设备是否位 于所属小区的边缘的信息, 并根据所述用户设备的位置确定当前时刻的秩。
秩接收单元判断秩接收窗口中接收到的各秩的分布状态时, 使用的判断 方法与下述秩自适应方法中描述的相同。
如图 2所示, 秩自适应方法包括以下步骤:
步骤 201 , 基站通过秩接收窗口接收用户设备上报的秩;
秩接收窗口长度(Trank )可以釆用固定的长度来定义, 也可以釆用固定 接收秩的上报周期的倍数方式来定义。一般地, Trank取值为 50ms到 1000ms, 或者为秩的上报周期的 N倍, N的取值范围为 3到 12的整数。 例如, 对秩接 收窗口的长度定义为 200ms或者 3个秩上报周期。
补充地, 可以根据接收天线个数和发射天线个数中的最小值 ^确定秩 接收窗口的长度, Nm ^的值越大则秩接收窗口的长度值越大。
秩接收窗口的处理流程如图 3所示, 图中设秩的上报周期为 4个传输时 间间隔( Transmission Time Interval, 简称 ΤΉ ) , N设为 4 , 即秩接收窗口长 度为 12个 TTI, 秩接收窗口以时间为轴进行滑动。 图 3中(a)表示在当前时刻 为 Ta时,秩接收窗口内接收到的秩包括分别为 rankl、 rank2、 rank3和 rank4。 图 3 中 (b)表示在当前时刻为 Tb时, 秩接收窗口内接收到的秩包括 rank3、 rank4、 rank5和 rank6。
对于^发射和 ^接收天线形成的 MIMO信道, 用户设备上报的秩的值 为 中的一个值, 其中 Λ^χ 5 = πώι{^ , ^ }。
步骤 202 , 基站根据当前时刻的秩接收窗口中各秩的分布状态确定当前 时刻的秩, 并根据此当前时刻的秩确定用于向所述用户设备发送下行数据的 独立信道的个数。
( 1 )秩接收窗口内的秩的个数大于阔值 Α时( Α为大于等于 3的整数), 根据秩接收窗口中接收到的各秩的分布状态确定当前时刻的秩具体包括以下 几种情况:
状态一(或称为稳定状态)指当秩接收窗口内各秩的值相同; 在状态一 下, 将秩接收窗口内最新上报的秩作为当前时刻的秩。
状态二(或称为慢变状态 )指 NmaxS大于等于 2且小于等于 7时, 秩接收 窗口内各秩的分布满足以下条件: 秩接收窗口内的秩依次为连续的 X和连续 的 y即 {x,...,x,y...,y}, x和 y的值相差 1, 其中, {l,...,Nmax , 且 y的个 数大于等于 X的个数; Nm ^等于 8时, 秩接收窗口内各秩的分布满足以下条 件: 秩接收窗口内的秩依次为连续的多个 X和连续多个 y和连续的多个 z即 {x,...,x,y,...,y,z,...,z}, 其中, x,y,ze {\,---,NwxS} , x, y, z的值依次差值为 1, x, y, z的值依次递增或递减, 且 y和 z的总个数大于等于 X的个数, 且 z的 个数大于等于 y的个数。 在状态二下, 将秩接收窗口内最新上报的秩作为当 前时刻的秩。
状态三 (或称为突变状态)指秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内的秩依次为连续的多个 X和一个 y, y与 X相差的绝对值为 m, x,^e {l,---,Nmax5}, l≤m≤NmaxS-U 在状态三下, y与 x的差值小于 0时(表示 秩的突变方向为减小), 将秩接收窗口内最新上报的秩作为当前时刻的秩; y 与 X的差值大于 0 (表示秩的方向为增大)且用户设备位于所属小区的边缘 时,将 1作为当前时刻的秩; y与 X的差值大于 0且用户设备不位于所属小区 的边缘时, 将 x+1作为当前时刻的秩。
状态四 (或称为切变状态)指秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内的秩依次为连续的多个 X和连续的多个 y 即{^...^^...^}, x,_ye {l,...,NmaxS}, X不等于 y, y的个数小于 X的个数,且 y的个数大于等于 n, n大于等于 2; 在状态四下, y的值小于 X时(表示秩的切变方向为减小) , 将秩接收窗口内最新上报的秩作为当前时刻的秩; y的值大于等于 X (表示秩 的方向为增大)且用户设备位于所属小区的边缘时, 将 1作为当前时刻的秩; y的值大于等于 X且用户设备不位于所属小区的边缘时,将秩接收窗口内最新 上报的秩作为当前时刻的秩。
在上述状态三和状态四中判断用户设备是否位于所属小区的边缘, 可以 釆用该用户设备上报的所属小区的参考信号接收功率 (Reference Signal Received Power, 简称 RSRP)来进行判断。 例如, 该用户设备上报的所在小 区的 RSRP小于等于 RSRP阔值 a时, 判断该用户设备位于小区边缘; 该用 户设备上报的所属小区的参考信号接收功率大于 RSRP阔值 a时, 判断该用 户设备不位于所属小区边缘。
状态五(或称为振荡状态)指^ ^大于等于 2且小于等于 7时, 秩接收 窗口内各秩的分布满足以下条件: 秩接收窗口内的秩依次为 X和 y的交替序 歹 |J, x,_ye{l,...,NmaxS}, y的值与 X的值相差 1; Nm ^等于 8时, 秩接收窗口内 各秩的分布满足以下条件:秩接收窗口内的秩包括 X和 y并且不存在连续的 X 和 y, x^e{l,---,Nmax5}, y的值与 x的值相差 1或 2, 或者, 秩接收窗口内的 秩包括 x、 y和 z并且 x、 y和 z中的一个与其余两个相邻, x,_y,ze {l,...,NmaxS}。 在状态五下, 将秩接收窗口内最小的秩作为当前时刻的秩。
状态六 (或称为跳变状态)秩接收窗口中接收到的各秩的分布状态不是 上述状态一至五中任何一个时, 则认为秩接收窗口中接收到的各秩的分布状 态是跳变状态。 在状态六下, 将秩接收窗口内最小的秩作为当前时刻的秩。
一般情况下, 判断秩接收窗口内各秩的分布状态时, 先判断是否是状态 一, 如果不是的话继续判断是否是状态二, 依次类推; 但也可以对上述五个 状态的判断不分先后次序。
N 大于等于 2且小于等于 3时, 判断秩接收窗口内各秩的分布状态均 不满足状态一、 二、 三、 四时, 不再判断是否为状态五或者状态六, 直接将 1作为当前时刻的秩。
(2)秩接收窗口内的秩的个数小于阔值 A时( A为大于等于 3的整数) 时, 将秩接收窗口内最小的秩作为当前时刻的秩。
具体实施例一:
对于发射天线 ^为 2和接收天线 ^为 2形成的 MIMO信道, Nm ^为 2, 即 UE反馈的秩值为 1或者 2。 秩上报周期为 10个 TTI, 秩接收窗口长为秩 的上报周期的 4倍, 即 N=4。 用于判断秩是否为突变的阔值 m为 1, 判断秩 是否为切变的阔值 n为 2。 令 UE上报的所在小区的 RSRP来判断该 UE是否 处在该小区边缘, 且阔值 a为 10。
在某一时刻, 秩接收窗口内的秩为 {1,1, 1,1} , 判断秩满足稳定的条件, 则对该 UE釆用最新上报的秩为 1进行调度。
在某一时刻, 秩接收窗口内的秩为 {1,1,2,2} , 先判断秩不满足稳定的条 件, 进一步判断满足慢变的条件, 因此, 釆用该 UE最新上报的秩为 2进行 调度。
在某一时刻, 秩接收窗口内的秩为 {1,1,1,2} , 先判断秩不满足稳定或者 慢变的条件; 进一步判断秩为突变, 进一步判断用户设备位于所属小区的边 缘时, 将 1作为当前时刻的秩。
在某一时刻, 秩接收窗口内的秩为 {1,1,2,1} , 先判断秩不满足稳定或者 慢变的条件; 进一步判断秩不满足突变的条件; 进一步判断秩不是切变; 则 釆用秩接收窗口内的最小秩为 1进行调度。
在某一时刻, 秩接收窗口内的秩为 {1,2,2,1} , 先判断秩不满足稳定或者 慢变的条件; 进一步判断秩不满足突变的条件; 进一步判断秩不是切变; 则 釆用秩接收窗口内的最小秩为 1进行调度。
在某一时刻, 秩接收窗口内的秩为 {1,2,1,1} , 先判断秩不满足稳定或者 慢变的条件; 进一步判断秩不满足突变的条件; 进一步判断秩不是切变; 则 釆用秩接收窗口内的最小秩为 1进行调度。
具体实施例二:
对于发射天线 ^为 4和接收天线 ^为 4形成的 MIMO信道, Nm ^为 4, 即 UE反馈的秩值为 1、 2、 3或者 4。 秩上报周期为 4个 TTI, 秩接收窗口长 为秩的上报周期的 4倍, 即 N=4。 用于判断秩是否为突变的阔值 m为 2, 判 断秩是否为切变的阔值 n为 2。 令 UE上报的所在小区的 RSRP来判断该 UE 是否处在该小区边缘, 且阔值 a为 10。
在某一时刻, 秩接收窗口内的秩为 {2,2,2,2} , 判断秩满足稳定的条件, 则对该 UE釆用最新上报的秩为 2进行调度。 在某一时刻, 秩接收窗口内的秩为 {2,2,3,3} , 先判断秩不满足稳定的条 件; 进一步判断秩满足慢变的条件。 因此, 取秩为最新上报的秩为 3进行调 度。
在某一时刻, 秩接收窗口内的秩为 {3,3,3,1} , 先判断秩不满足稳定的条 件; 进一步判断秩不满足慢变的条件; 进一步判断秩满足突变的条件; 进一 步判断该 UE上报的秩为的突变方向为减小; 因此, 则釆用该 UE最新上报的 秩为 1进行调度。
在某一时刻, 秩接收窗口内的秩为 {2,2,2,4} , 先判断秩不满足稳定的条 件; 进一步判断秩不满足慢变的条件; 进一步判断秩满足突变的条件; 进一 步判断该 UE上报的秩的突变方向为增大; 由该 UE上报的所在小区的 RSRP 为 5, 进一步判断该 UE在所在小区的边缘。 因此, 则秩为 1进行调度。
上述方法可以合理地预测 MIMO信道的秩的变化, 以更好地利用 MIMO 信道资源进行数据传输, 提高 MIMO信道的吞吐率。
尽管本发明结合特定实施例进行了描述, 但是对于本领域的技术人员来 说, 可以在不背离本发明的精神或范围的情况下进行修改和变化。 这样的修 改和变化被视作在本发明的范围和附加的权利要求书范围之内。
工业实用性
本发明提供一种秩自适应方法及装置, 通过基站根据当前时刻的秩接收 窗口中各秩的分布状态确定当前时刻的秩, 合理地预测 MIMO信道的秩的变 化, 以更好地利用 MIMO信道资源进行数据传输。

Claims

权 利 要 求 书
1、 一种秩自适应方法, 包括:
基站通过秩接收窗口接收用户设备上报的秩, 所述基站根据当前时刻的 秩接收窗口中各秩的分布状态确定当前时刻的秩, 并根据此当前时刻的秩确 定用于向所述用户设备发送下行数据的独立信道的个数。
2、 如权利要求 1 所述的自适应方法, 其中, 在确定当前时刻的秩的 步骤中:
秩接收窗口内的秩的个数大于阔值 A并且当前时刻的秩接收窗口中各秩 的分布状态为状态二时, 所述基站将秩接收窗口内所述用户设备最新上报的 秩作为当前时刻的秩;
其中, 状态二是指:
接收天线个数和发射天线个数中的最小值 Nm ^大于等于 2且小于等于 7 时, 秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内的秩依次为连续 的 X和连续的 y , 其中, X和 y的值相差 1 , y的个数大于等于 X的个数; 或 Nm ^等于 8时, 秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内 的秩依次为连续的 x、 连续的 y和连续的 z , 其中, X , y , z的值依次差值为 1 , X , y , z的值依次递增或递减, 且 y和 z的总个数大于等于 X的个数, z 的个数大于等于 y的个数。
3、 如权利要求 1 所述的自适应方法, 其中, 在确定当前时刻的秩的 步骤中:
秩接收窗口内的秩的个数大于阔值 A并且当前时刻的秩接收窗口中各秩 的分布状态为状态三时, 状态三是指秩接收窗口内的秩依次为连续的 X和一 个 y , y与 X相差的绝对值为 m, m大于等于 1且小于等于 NmaxS-l , Nm ^指接 收天线个数和发射天线个数中的最小值; 所述基站进一步判断:
y与 X的差值小于 0时,将秩接收窗口内最新上报的秩作为当前时刻的秩; y与 X的差值大于 0且用户设备位于所属小区的边缘时,将 1作为当前时 刻的秩; y与 x的差值大于 0且用户设备不位于所属小区的边缘时, 将 x+1作为 当前时刻的秩。
4、 如权利要求 1 所述的自适应方法, 其中, 在确定当前时刻的秩的 步骤中:
秩接收窗口内的秩的个数大于阔值 A并且当前时刻的秩接收窗口中各秩 的分布状态为状态四时, 状态四是指秩接收窗口内的秩依次为连续的 X和 y , X不等于 y , y的个数小于 X的个数, 且 y的个数大于等于 n, n大于等于 2; 所述基站进一步判断:
y的值小于 X时, 将秩接收窗口内最新上报的秩作为当前时刻的秩; y的值大于等于 X且用户设备位于所属小区的边缘时,将 1作为当前时刻 的秩;
y的值大于等于 X且用户设备不位于所属小区的边缘时, 将秩接收窗口 内最新上报的秩作为当前时刻的秩。
5、 如权利要求 3或 4所述的自适应方法, 其中:
所述用户设备位于所属小区边缘是指所述用户设备上报的所属小区的参 考信号接收功率小于等于系统设置的所属小区的参考信号接收功率阔值; 所述用户设备不位于所属小区边缘是指所述用户设备上报的所属小区的 参考信号接收功率大于所述所属小区的参考信号接收功率阔值。
6、 如权利要求 1 所述的自适应方法, 其中, 在确定当前时刻的秩的 步骤中:
秩接收窗口内的秩的个数大于阔值 A并且当前时刻的秩接收窗口中各秩 的分布状态为状态五时, 所述基站将秩接收窗口内最小的秩作为当前时刻的 秩;
状态五指接收天线个数和发射天线个数中的最小值 ^大于等于 2且小 于等于 7时, 秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内的秩依 次为 X和 y的交替序列, y的值与 X的值相差 1; 或
Wm ^等于 8时, 秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内 的秩包括 X和 y并且不存在连续的 X和 y , y的值与 X的值相差 1或 2, 或者, 秩接收窗口内的秩包括 x、 y和 z ,并且 x、 y和 z中的一个均与其余两个相邻。
7、 如权利要求 1 所述的自适应方法, 其中, 在确定当前时刻的秩的 步骤中:
秩接收窗口内的秩的个数大于阔值 A并且接收天线个数和发射天线个数 中的最小值 Nm ^大于等于 2且小于等于 3并且当前时刻的秩接收窗口中各秩 的分布状态不满足状态一、 状态二、 状态三和状态四时, 将 1作为当前时刻 的秩;
状态一是指秩接收窗口内各秩的值相同;
状态二是指秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内的秩 依次为连续的 X和连续的 y, 其中, X和 y的值相差 1 , y的个数大于等于 x 的个数;
状态三是指秩接收窗口内的秩依次为连续的 X和一个 y, y与 X相差的绝 对值为 m, m大于等于 1且小于等于 NmaxS-l ;
状态四是指秩接收窗口内的秩依次为连续的 X和 y, X不等于 y, y的个 数小于 X的个数, 且 y的个数大于等于 n, n为大于等于 2。
8、 如权利要求 1 所述的自适应方法, 其中, 在确定当前时刻的秩的 步骤中:
秩接收窗口内的秩的个数大于阔值 A并且接收天线个数和发射天线个数 中的最小值 NmaxS大于等于 4并且当前时刻的秩接收窗口中各秩的分布状态不 满足状态一、 状态二、 状态三、 状态四和状态五时, 所述基站将秩接收窗口 内最小的秩作为当前时刻的秩;
状态一是指秩接收窗口内各秩的值相同;
状态二是指 NmaxS大于等于 4且小于等于 7时, 秩接收窗口内各秩的分布 满足以下条件: 秩接收窗口内的秩依次为连续的 X和连续的 y, X和 y的值相 差 1 , 且 y的个数大于等于 X的个数; 或^ ^等于 8时, 秩接收窗口内各秩 的分布满足以下条件:秩接收窗口内的秩依次为连续的 x、连续的 y和连续的 z , 其中, X, y, z的值依次差值为 1 , X, y, z的值依次递增或递减, 且 y和 z的总个数大于等于 X的个数, z的个数大于等于 y的个数; 状态三是指秩接收窗口内的秩依次为连续的 x和一个 y, y与 X相差的绝 对值为 m, m大于等于 1且小于等于 NmaxS-l ;
状态四是指秩接收窗口内的秩依次为连续的 X和 y, X不等于 y, y的个 数小于 X的个数, 且 y的个数大于等于 n, n为大于等于 2;
状态五是指 Nm ^大于等于 4且小于等于 7时, 秩接收窗口内各秩的分布 满足以下条件: 秩接收窗口内的秩依次为 X和 y的交替序列, y的值与 X的 值相差 1 ; 或^^等于 8时, 秩接收窗口内各秩的分布满足以下条件: 秩接 收窗口内的秩包括 X和 y并且不存在连续的 X和 y, y的值与 x的值相差 1或 2, 或者, 秩接收窗口内的秩包括 x、 y和 z并且 x、 y和 z中的一个均与其余 两个相邻。
9、 如权利要求 1 所述的自适应方法, 其中, 在确定当前时刻的秩的 步骤中:
秩接收窗口内的秩的个数小于阔值 A时, 所述基站将秩接收窗口内最小 的秩作为当前时刻的秩。
10、 如权利要求 2、 3、 4、 6、 7、 8或 9所述的自适应方法, 其中: 所述阔值 A为大于等于 3的整数。
11、 一种秩自适应装置, 包括: 相连的秩接收单元和秩判决单元; 所述秩接收单元设置成通过秩接收窗口接收用户设备上报的秩, 并发送 至秩判决单元;
所述秩判决单元设置成根据当前时刻的秩接收窗口中各秩的分布状态确 定当前时刻的秩, 并根据此当前时刻的秩确定用于向所述用户设备发送下行 数据的独立信道的个数。
12、 如权利要求 11所述的装置, 其中:
所述秩判决单元还设置成判断秩接收窗口内的秩的个数大于阔值 A并且 当前时刻的秩接收窗口中各秩的分布状态为状态二时, 将秩接收窗口内所述 用户设备最新上报的秩作为当前时刻的秩;
其中, 状态二是指: 接收天线个数和发射天线个数中的最小值 Nm ^大于等于 2且小于等于 7 时, 秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内的秩依次为连续 的 X和连续的 y, 其中, X和 y的值相差 1 , y的个数大于等于 X的个数; 或
Wm ^等于 8时, 秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内 的秩依次为连续的 x、 连续的 y和连续的 z , 其中, X, y, z的值依次差值为 1 , X, y, z的值依次递增或递减, 且 y和 z的总个数大于等于 X的个数, z 的个数大于等于 y的个数。
13、 如权利要求 11所述的装置, 还包括与所述秩判决单元相连的用户 设备位置测量单元, 其中,
所述用户设备位置测量单元设置成测量用户设备是否位于所属小区的边
所述秩判决单元还设置成: 判断秩接收窗口内的秩的个数大于阔值 A并 且当前时刻的秩接收窗口中各秩的分布状态为状态三时, 状态三是指秩接收 窗口内的秩依次为连续的 X和一个 y, y与 X相差的绝对值为 m, m大于等于 1 且小于等于 NmaxS-l , Nm ^指接收天线个数和发射天线个数中的最小值; 进 一步:
判断 y与 X的差值小于 0时, 将秩接收窗口内最新上报的秩作为当前时 刻的秩;
判断 y与 X的差值大于 0时, 从所述用户设备位置测量单元获知用户设 备是否位于所属小区的边缘的信息, 并根据所述用户设备的位置确定当前时 刻的秩: 用户设备位于所属小区的边缘时, 将 1作为当前时刻的秩; 用户设 备不位于所属小区的边缘时, 将 x+1作为当前时刻的秩。
14、 如权利要求 11所述的装置, 还包括与所述秩判决单元相连的用户 设备位置测量单元, 其中,
所述用户设备位置测量单元设置成测量用户设备是否位于所属小区的边
所述秩判决单元还设置成: 判断秩接收窗口内的秩的个数大于阔值 A并 且秩接收窗口中接收到的各秩的分布状态为状态四时, 状态四是指秩接收窗 口内的秩依次为连续的 x和 y, X不等于 y, y的个数小于 X的个数, 且 y的 个数大于等于 n, n为大于等于 2; 进一步:
判断 y的值小于 X时,将秩接收窗口内最新上报的秩作为当前时刻的秩; 判断 y的值大于等于 X时, 从所述用户设备位置测量单元获知用户设备 是否位于所属小区的边缘的信息, 并根据所述用户设备的位置确定当前时刻 的秩: 用户设备位于所属小区的边缘时, 将 1作为当前时刻的秩; 用户设备 不位于所属小区的边缘时,将秩接收窗口内最新上报的秩作为当前时刻的秩。
15、 如权利要求 11所述的装置, 其中:
所述秩判决单元还设置成判断秩接收窗口内的秩的个数大于阔值 A并且 秩接收窗口中接收到的各秩的分布状态为状态五时, 将秩接收窗口内最小的 秩作为当前时刻的秩;
状态五指: 接收天线个数和发射天线个数中的最小值 Nm ^大于等于 2且 小于等于 7时, 秩接收窗口内各秩的分布满足以下条件: 秩接收窗口内的秩 依次为 X和 y的交替序列, y的值与 X的值相差 1 ; 或 ^等于 8时, 秩接收 窗口内各秩的分布满足以下条件: 秩接收窗口内的秩包括 X和 y并且不存在 连续的 X和 y, y的值与 X的值相差 1或 2, 或者, 秩接收窗口内的秩包括 x、 y和 z , 并且 x、 y和 z中的一个均与其余两个相邻。
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