WO2014183416A1 - 成员载波分配方法、装置及计算机存储介质 - Google Patents

成员载波分配方法、装置及计算机存储介质 Download PDF

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Publication number
WO2014183416A1
WO2014183416A1 PCT/CN2013/087997 CN2013087997W WO2014183416A1 WO 2014183416 A1 WO2014183416 A1 WO 2014183416A1 CN 2013087997 W CN2013087997 W CN 2013087997W WO 2014183416 A1 WO2014183416 A1 WO 2014183416A1
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WO
WIPO (PCT)
Prior art keywords
preset threshold
cell
user terminal
frequency domain
component carrier
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PCT/CN2013/087997
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English (en)
French (fr)
Inventor
王曼
葛万成
桂任舟
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.)
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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 US14/890,916 priority Critical patent/US9602254B2/en
Priority to EP13884519.3A priority patent/EP2999288B1/en
Publication of WO2014183416A1 publication Critical patent/WO2014183416A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0071—Allocation based on fairness other than the proportional kind

Definitions

  • the present invention relates to communication technologies, and in particular, to a component carrier allocation method and apparatus, and a computer storage medium. Background technique
  • LTE Long Term Evolution
  • the UE User Equipment
  • the mobility of the cellular network can be maintained in high-speed mobile scenarios of 120 to 350 km/h (even supporting 500 km/h in some frequency bands).
  • CA Carrier Aggregation
  • the main purpose of the embodiments of the present invention is to provide a component carrier allocation method,
  • the device and the computer storage medium address at least the problem of poor communication quality of the high-speed mobile user terminal in the cell due to low fairness of cell member carrier allocation.
  • An embodiment of the present invention provides a component carrier allocation method, where the method includes: determining, when a component carrier that has a frequency exceeding a preset threshold in a currently assignable component carrier in a cell, according to the component carrier whose frequency exceeds a preset threshold Coverage, updating the frequency domain metric value of the user terminal in the cell;
  • the frequency domain priority is determined according to the updated frequency domain metric value, and the component carrier whose frequency exceeds a preset threshold is allocated to the user terminal in the small area according to the frequency domain priority.
  • the method further includes: determining a frequency domain metric value of the cell user terminal (1 + , being a user terminal k), before determining that a component carrier having a frequency exceeding a preset threshold exists in a currently available component carrier in the cell. Minute
  • ⁇ is the average data transmission rate of the user terminal k before the t-slot
  • r m (t) is the instantaneous data transmission rate reached by the user terminal k on the allocated component carrier m in the t-slot
  • T is the measurement window size of the average throughput of the cell.
  • the frequency domain metric value of the user terminal in the cell is updated according to the coverage of the component carrier whose frequency exceeds a preset threshold, and includes:
  • the coverage radius of the component carrier whose frequency exceeds the preset threshold is greater than or equal to the preset threshold r 2
  • the distance between the update and the base station to which the cell belongs is greater than a preset threshold!
  • the frequency domain metric value of the user terminal smaller than the preset threshold r 2 is ax FDMi
  • the frequency domain metric value of the user terminal whose distance from the base station to which the cell belongs is greater than or equal to the preset threshold r 2 is updated, where X XDMM 2 , where , FDM, FDM 2 is the frequency domain metric value of the user terminal before the update, a is greater than 1, b is greater than a;
  • the distance between the update and the base station to which the cell belongs is greater than a preset threshold! ⁇ and the frequency of the user terminal less than the preset threshold r 2
  • the domain metric is ax FDMi, and the frequency domain metric value of the user terminal whose distance from the base station of the cell is greater than or equal to the preset threshold r 2 is 0, where a is greater than 1, and FDMi is the frequency domain metric of the user terminal before the update. value.
  • the method further includes:
  • the method further includes:
  • the preset number of component carriers in the component carrier whose control frequency exceeds the preset threshold exceeds the area where the distance from the cell to which the cell belongs exceeds the preset threshold r 2 , and controls the preset number of component carriers in the component carrier whose frequency exceeds the preset threshold.
  • An area of the base station to which the cell belongs is greater than a preset threshold and smaller than a preset threshold r 2 ;
  • the component carrier coverage whose control frequency does not exceed the preset threshold is less than or equal to the preset threshold by the base station to which the cell belongs! The area of ⁇ .
  • the embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores a computer program, and the computer program is used to execute the component carrier allocation method described above.
  • the embodiment of the present invention further provides a component carrier allocation device, where the device includes: a first determining unit, an updating unit, and an allocating unit;
  • the first determining unit is configured to determine whether a component carrier whose frequency exceeds a preset threshold exists in a component carrier currently assignable in the cell;
  • the updating unit is configured to: when the judgment result of the determining unit is yes, update the frequency domain of the user terminal in the cell according to the coverage of the component carrier whose frequency exceeds a preset threshold Measured value
  • the allocating unit is configured to determine a frequency domain priority according to the frequency domain metric value determined by the updating unit, and allocate, according to the frequency domain priority, a component carrier whose frequency exceeds a preset threshold for a user terminal in the cell.
  • the device further includes:
  • a determining unit configured to determine, by the first determining unit, whether the frequency of the cell user terminal is m (t) before determining whether a component carrier whose frequency exceeds a preset threshold exists in the currently assignable component carrier in the cell
  • the domain metric is (i+ ( i) ? ()), G is the set of component carriers allocated by user terminal k, and 3 ⁇ 4(t) is the average data transmission rate of user terminal k before t-slot, r m (t) is The instantaneous data transmission rate reached by the user terminal k on the assigned component carrier m in the t-slot, and T is the measurement window size of the average throughput of the user terminal k.
  • the updating unit is further configured to: when the coverage radius of the component carrier whose frequency exceeds the preset threshold is greater than or equal to the preset threshold r 2 , the distance between the update and the base station to which the cell belongs is greater than a preset threshold! And the frequency domain metric value of the user terminal that is smaller than the preset threshold r 2 is axFDMi, and the frequency domain metric value of the user terminal whose distance from the base station to which the cell belongs is greater than or equal to the preset threshold r 2 is updated as bx FDM 2 , where FDM FDM 2 is the frequency domain metric value of the user terminal before the update, a is greater than 1, and b is greater than a;
  • the distance between the update and the base station to which the cell belongs is greater than a preset threshold!
  • the frequency domain metric value of the user terminal that is smaller than the preset threshold r 2 is axFDMi
  • the frequency domain metric value of the user terminal whose distance from the base station of the cell is greater than or equal to the preset threshold r 2 is 0, where a is greater than 1
  • FDMi is the frequency domain metric before the update.
  • the device further includes:
  • a second determining unit configured to determine whether a currently available component carrier in the cell exists a component carrier whose frequency does not exceed the preset threshold
  • the allocating unit is further configured to: when the judgment result of the second determining unit is no, the root
  • a component carrier whose frequency does not exceed the preset threshold is allocated to the user terminal in the cell.
  • the device further includes:
  • the control unit is configured to control a preset number of component carriers in the component carrier whose frequency exceeds the preset threshold to cover an area where the distance from the base station of the cell exceeds a preset threshold r 2 , and control a preset number of component carriers whose frequency exceeds a preset threshold.
  • the component carrier covers an area where the distance from the base station to which the cell belongs is greater than a preset threshold and less than a preset threshold r 2 ;
  • the component carrier coverage whose control frequency does not exceed the preset threshold is less than or equal to the preset threshold by the base station to which the cell belongs! The area of ⁇ .
  • the frequency domain metric value of the user terminal in the cell is updated according to the coverage of the component carrier.
  • the base station to which the distance cell belongs can be increased by a preset threshold!
  • the priority of the user terminal that is smaller than the preset threshold r 2 and the base station to which the cell belongs exceeds the preset threshold r 2 , which ensures the fairness of component carrier allocation and improves the data throughput of the high-speed mobile user terminal, thereby ensuring The communication quality of the user terminal.
  • FIG. 1B is a schematic flowchart of a method for implementing a component carrier allocation method according to an embodiment of the present invention
  • FIG. 1b is a schematic diagram of a distribution of a cell user terminal according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a component carrier allocation apparatus according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of an implementation process of component carrier allocation according to an embodiment of the present invention.
  • FIG. 1A is a schematic flowchart of a method for allocating a component carrier according to an embodiment of the present invention. As shown in FIG. 1A, the method includes the following steps: Step 101: Determine that a cell is currently available. When a component carrier whose frequency exceeds a preset threshold exists in the allocated component carrier, the frequency domain metric value of the user terminal in the cell is updated according to the coverage of the component carrier whose frequency exceeds a preset threshold.
  • step 101 Before step 101, according to the proportional fair allocation policy, determining a time domain metric (TDM, Time Domain Metric) of the user terminal in the cell, where D(j, t) is the user
  • the throughput achieved by the terminal i in the time slot t is the average throughput of the user terminal i in t time slots; and the frequency domain metric value (FDM, of the cell user terminal is also determined according to the proportional fair allocation policy).
  • a set of component carriers, 3 ⁇ 4 (0 is the average data transmission rate of the user terminal k before the t-slot, and r km W is the instantaneous data transmission rate reached by the user terminal k on the allocated component carrier m in the t-slot, T
  • the window size is measured for the average throughput of the cell.
  • the distribution diagram of the cell user in the embodiment of the present invention is as shown in FIG. 1b, and the distance from the base station to which the cell belongs does not exceed the preset threshold ii (the values of ri and r 2 are preset according to the network condition and the network condition), and the user terminal is the cell core.
  • the user terminal in the area, the user terminal that is greater than the preset threshold and less than the preset threshold r 2 from the base station to which the cell belongs is the user terminal in the central area of the cell, and the user terminal whose base station distance is greater than or equal to the preset threshold r 2 is the cell.
  • the user terminals in the cell edge area and the user terminals in the central area of the cell are allocated less component carriers, resulting in a data throughput significantly lower than the user terminal in the core area of the cell.
  • the communication quality of the user terminal in the cell edge area and the user terminal in the cell middle area is affected.
  • the inventor finds that when the component carrier is allocated to the user terminal in the cell edge area and the user terminal in the cell middle area, if the frequency domain metric value of the cell edge area user terminal and the cell middle area user terminal is increased according to the preset amplitude, The probability of being a component carrier of the user terminal in the cell edge area and the user terminal of the cell in the middle of the cell is obviously increased, thereby improving data throughput; and the inventors also find that: when the component carriers have the same coverage, the member whose frequency is lower than the preset threshold The channel fading of the carrier is small.
  • the user terminal preferentially requires the allocation of component carriers with low channel conditions, and the number of user terminals in different areas of the cell is from high to low: cell core area, cell middle area, and cell.
  • the frequency of the component carriers covering the cell core area, the cell middle area, and the cell edge area is increased in sequence.
  • the component carrier whose control frequency does not exceed the preset threshold covers the cell core area ( Distance Region belongs to a base station area less than or equal)
  • the control frequency is higher than a preset threshold value
  • the cell middle carrier coverage area i.e., greater than a distance smaller than the cell area and the base station belongs
  • a cell edge region r 2 i.e. the base station of the cell from the cell a region larger than r 2
  • a frequency of a component carrier covering a cell edge region is higher than a frequency of a component carrier of a central region of the coverage cell;
  • the component carrier whose frequency is higher than the preset threshold uses the high power transmission to enable the component carrier coverage with the frequency higher than the preset threshold.
  • the component carrier in the middle area of the cell (that is, the area where the base station of the cell is larger than ri and smaller than r 2 ) is higher than the preset threshold, and the core area of the cell is also covered. (ie, the area that is less than or equal to the base station to which the cell belongs), covering the component carrier of the cell edge area (ie, the area of the cell that is larger than r 2 from the base station of the cell), and covering the core area of the cell and the middle area (ie, the base station of the distance cell) An area less than or equal to r 2 ).
  • LTE-A Long Term Evolution-Advanced
  • deployment bands include: 450 ⁇ 470 megahertz (MHz), 698 ⁇ 862MHz, 790 ⁇ 862MHz, 2.3 ⁇ 2.4 gigahertz (GHz), 3.4 - 4.2 GHz, 4.4 ⁇ 4.99GHz.
  • controlling the frequency in the above frequency band does not exceed the preset frequency
  • the 862MHz frequency band namely: 450 ⁇ 470MHz, 698 ⁇ 862MHz, 790 - 862MHz, the corresponding component carrier covers the core area of the cell:
  • the corresponding component carrier covers the central area of the cell, and correspondingly covers the core area i of the cell;
  • the two frequency bands with the highest frequency in the frequency band above the preset threshold of 1 GHz are controlled, that is, 3.4 - 4.2 GHz, 4.4 ⁇ 4.99 GHz, and the corresponding component carriers cover the cell edge area, that is, cover the entire cell.
  • FIG. 1B is a schematic diagram of a distribution of a cell user terminal according to an embodiment of the present invention.
  • a cell uniformly distributed by a user terminal is used as an example to describe how to use L component carriers to cover different areas of a cell in the embodiment of the present invention, and set a cell.
  • the number of component carriers covered in the core area, the middle area of the cell, and the edge area of the cell are X, ⁇ , and ⁇ , respectively.
  • the (LY) member carriers outside the carrier can be derived from:
  • 2r 2 -r x 3r 2 -2r x can determine that when the cell covers 20 component carriers, it is determined that 14 component carriers are lower than the preset threshold to cover the core area of the cell, and the four frequencies are higher than The component carrier of the preset threshold covers the central area of the cell, and the two component carriers whose high frequency is higher than the preset threshold cover the cell edge area, that is, cover all areas of the cell.
  • the distance of the base station to which the update cell belongs is greater than a preset threshold! ⁇
  • the frequency domain metric of the user terminal that is less than the preset threshold r 2 is ax FDM, where a is greater than 1, and FDM is the frequency domain metric before the update, ie
  • the frequency domain metric of the end is 0.
  • the coverage radius of the component carrier is smaller than the preset threshold r 2 , the component carrier is not covered by the cell edge region, and therefore cannot be allocated to the user terminal in the cell edge region, that is, The user terminal of the cell to which the cell belongs is greater than or equal to the preset threshold r 2 , and correspondingly sets the frequency domain metric value of the user terminal in the cell edge region to 0, so that the component carrier is not allocated to the cell edge region.
  • the user terminal of the cell to which the cell belongs is greater than or equal to the preset threshold r 2 , and correspondingly sets the frequency domain metric value of the user terminal in the cell edge region to 0, so that the component carrier is not allocated to the cell edge region.
  • the distance of the base station to which the update cell belongs is greater than a preset threshold! ⁇
  • the frequency domain metric of the user terminal that is less than the preset threshold r 2 is ax FDMi, and FDMi is the frequency domain metric before the update, ie
  • the coverage radius of the component carrier is greater than or equal to the preset threshold r 2 to identify the component carrier coverage cell edge region, and correspondingly, improve the frequency domain metric value of the user terminal in the cell edge region and the cell middle region, and make the cell edge region
  • the frequency domain metric value of the user terminal is higher than the frequency domain metric value of the user terminal in the central area of the cell, so as to increase the probability that the component carrier is allocated to the cell edge user terminal and the cell central area user terminal.
  • Step 102 Determine a frequency domain priority according to the updated frequency domain metric value, and allocate, according to the frequency domain priority, a component carrier whose frequency exceeds a preset threshold for the user terminal in the cell.
  • the frequency domain metric value of the updated frequency domain is determined to be the frequency domain priority of the user terminal, and the component terminal is allocated to the user terminal according to the order of priority from high to low.
  • the embodiment of the present invention uses the low frequency component carrier (ie, the member carrier whose frequency is lower than the preset threshold) to cover the core area of the cell, when it is determined that the frequency of the currently assignable component carrier does not exceed
  • the order of (T - ⁇ ) R k (t) is determined as the frequency domain priority of the user terminal, and the component terminals whose frequency does not exceed the preset threshold are allocated to the user terminal in descending order of priority.
  • An embodiment of the present invention further provides a computer storage medium, where the computer storage medium A computer program is stored for performing the component carrier allocation method described in the above embodiments.
  • FIG. 2 is a schematic structural diagram of a component carrier allocation device according to an embodiment of the present invention. As shown in FIG. 2, the device includes: a first determining unit 21 and an updating unit 22 And an allocation unit 23; wherein
  • the first determining unit 21 is configured to determine whether a component carrier whose frequency is more than a preset threshold exists in the currently assignable component carriers in the cell;
  • the updating unit 22 is configured to: when the determination result of the first determining unit 21 is YES, update the frequency domain metric value of the user terminal in the cell according to the coverage of the component carrier whose frequency exceeds a preset threshold;
  • the allocating unit 23 is configured to determine a frequency domain priority according to the frequency domain metric value determined by the updating unit 22, and allocate, according to the frequency domain priority, a component carrier whose frequency exceeds a preset threshold for the user terminal in the cell. .
  • the device further includes:
  • the determining unit 24 is configured to determine, by the first determining unit 21, whether the component carrier that has a frequency exceeding a preset threshold exists in the currently assignable member carrier in the cell, and determines the cell user terminal.
  • the frequency domain metric is (1+ ⁇ )
  • G is the set of component carriers allocated by user terminal k
  • R k (t) is the average data transmission rate of user terminal k before t time slot
  • r m (t) is The instantaneous data transmission rate reached by the user terminal k on the assigned component carrier m in the t-slot
  • T is the measurement window size of the average cell throughput.
  • the updating unit 22 is further configured to: when the coverage radius of the component carrier whose frequency exceeds the preset threshold is greater than or equal to the preset threshold r 2 , the distance between the update and the base station to which the cell belongs is greater than a preset threshold and less than a preset threshold.
  • the frequency domain metric value of the user terminal of r 2 is a X FDMj , and the frequency domain metric value of the user terminal whose distance from the base station to which the cell belongs is greater than or equal to the preset threshold r 2 is updated.
  • x FDM 2 where FDM FDM 2 is a frequency domain metric value of the user terminal before updating, a is greater than 1, and b is greater than a;
  • the distance between the update and the base station to which the cell belongs is greater than a preset threshold!
  • the frequency domain metric value of the user terminal that is less than the preset threshold r 2 is ax FDMi
  • the frequency domain metric value of the user terminal whose distance from the base station of the cell is greater than or equal to the preset threshold r 2 is 0, where a is greater than 1, FDMi is the frequency domain metric before the update.
  • the device further includes:
  • the second determining unit 25 is configured to determine whether a component carrier whose frequency does not exceed the preset threshold exists in the currently assignable component carriers in the cell;
  • the allocating unit 23 is further configured to, when the determination result of the second determining unit 25 is negative,
  • the device further includes:
  • the control unit 26 is configured to control a preset number of component carriers in the component carrier whose frequency exceeds the preset threshold to cover an area where the distance from the base station of the cell exceeds a preset threshold r 2 , and preset a preset of the component carrier whose frequency exceeds a preset threshold.
  • the number of component carriers covers an area where the distance from the base station to which the cell belongs is greater than a preset threshold and less than a preset threshold r 2 ;
  • the component carrier coverage whose control frequency does not exceed the preset threshold is less than or equal to the preset threshold by the base station to which the cell belongs! The area of ⁇ .
  • the first determining unit 21, the updating unit 22, the allocating unit 23, the determining unit 24, the second determining unit 25, and the control unit 26 may each be a central processing unit (CPU), a digital signal processor. (DSP, Digital Signal Processor) or on-site Field Programmable Gate Array (FPGA) implementation.
  • CPU central processing unit
  • DSP Digital Signal Processor
  • FPGA Field Programmable Gate Array
  • the present invention is further described by taking an out-of-band non-adjacent carrier aggregation scenario as an example.
  • the cell diagram in the embodiment of the present invention is as shown in FIG. 1b.
  • the cell uniformly distributes 100 user terminals, and the cell covers 20 component carriers, members.
  • the frequency of the carrier is ⁇ f , f 2 , ..., f 20 ⁇ , where fi ⁇ f 2 ⁇ ... ⁇ fi 4 ⁇ 300 kHz ⁇ f 15 ⁇ ... ⁇ f 20 , and each member carrier has the same Bandwidths, that is, all have the same number of resource blocks, and the coverage cell edge determined according to the embodiment of the present invention
  • the range of the number of component carriers in the area is Li: , and the coverage cell
  • the range of the number of component carriers in the 9R l region ( ⁇ 2r 2 -r x (L : 3r z 22 x -2r x l2) ), 14 low frequency component carriers whose control frequency does not exceed the preset threshold of 300 kHz, That is, the component carrier corresponding to f ⁇ f 14 covers the core area of the cell, and the component carrier with the highest frequency is the two high-frequency component carriers with the highest frequency, that is, the component carriers corresponding to 9 and f 20 cover the entire cell.
  • the remaining four high frequency component carriers are controlled, that is, the component carriers corresponding to f 15 to f 18 cover the central area of the cell, and the coverage of the component carriers is implemented by controlling the transmit power of the component carriers.
  • FIG. 3 is a schematic flowchart of an implementation process of component carrier allocation according to an embodiment of the present invention. As shown in FIG. 3, the method includes the following steps:
  • Step 301 Determine a frequency domain metric value of the user terminal.
  • the time domain metric value of the user terminal is determined according to the proportional fair allocation policy.
  • the instantaneous rate ⁇ (n, t) of the user terminal i on RB n in time slot t is log(l + ⁇ , (n, t)), where W is The bandwidth of RB n , ⁇ is the signal-to-noise ratio difference, and its value is 1.5 ⁇ "(5 3 ⁇ 4")] [-1.5/ln (5Pen)], Pen is the target The bit error bit rate.
  • Step 302 Determine whether there is a component carrier whose frequency exceeds a preset threshold in the currently assignable component carrier in the cell. If yes, go to step 303. Otherwise, go to step 306.
  • Step 303 Determine whether the component carrier covers the cell edge area. If yes, perform step 304; otherwise, go to step 305.
  • Step 304 Update the frequency domain metric value of the user terminal in the central area of the cell to ax FDMi, and update the frequency domain metric value of the user terminal in the cell edge area to b FDM 2 .
  • the frequency domain metric of the user terminal is b X FDM 2 , where FDM i and FDM 2 are frequency domain metric values of the user terminal before the update, a is greater than 1, and b is greater than a.
  • Step 305 Update the frequency domain metric value of the user terminal in the central area of the cell to a X FDMj, and update the frequency domain metric value of the user terminal in the cell edge area to 0.
  • the frequency domain metric value of the user terminal that is less than the preset threshold r 2 is ax FDMi , and the frequency domain metric value of the user terminal whose base station is greater than or equal to the preset threshold r 2 is 0, where a is greater than 1, FDM is the frequency domain metric of the user terminal before the update.
  • Step 306 Determine a frequency domain priority of the user terminal according to an order of the current frequency domain metric value from high to low, and allocate a component carrier to the user terminal according to the determined frequency domain priority.
  • the component carrier that can be allocated in step 303 is a set of component carriers whose frequency exceeds a preset threshold, that is, the component carrier belongs to the lowest frequency of 14 frequency components. Since the component carrier is only allocated to the user terminal in the core area of the cell, the direct execution is performed. Step 306: It is not required to adjust the frequency domain metric value of the user terminal in the central area of the cell and the edge area of the d.
  • the set of component carriers that can be allocated by the user terminal in the central area of the cell is ⁇ f 15 , f 16 , ..., f 20 ⁇ , and each user terminal allocates component carriers in descending order of the updated frequency domain metric value a X FDMj;
  • the user terminal in the cell edge area can allocate the two component carriers with the highest frequency, that is, the component carriers corresponding to f 19 and f 2 o , and the frequency domain priority determined according to the updated frequency domain metric value bxFDM 2 is the cell edge region.
  • the user terminal within is assigned a component carrier, ie, for f 19 , f 2 .
  • the corresponding component carrier, the user terminal in the cell edge area has the highest allocation priority, the priority of the user terminal in the central user area of the cell is second, and the priority of the user terminal in the core area of the cell is the lowest; corresponding to f 15 ⁇ f 18
  • the component carrier, the user terminal in the cell edge area cannot be allocated, the user terminal in the cell middle area has the highest priority assigned, and the priority of the user terminal in the cell core area is second; for the component carrier corresponding to f ⁇ f 14 , only the cell core
  • the regional user terminal can be allocated; thereby improving the throughput of the user terminal in the cell edge area and ensuring the communication quality; and controlling the low frequency component carrier having the better channel condition in the core area of the cell to ensure that the throughput of the cell is maintained at Higher level.
  • the frequency domain of the user terminal in the cell is updated according to the coverage of the component carrier whose frequency exceeds a preset threshold.
  • the metric value is determined according to the updated frequency domain metric value, and the component carrier whose frequency exceeds a preset threshold is allocated to the user terminal in the cell according to the frequency domain priority.

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Abstract

本发明实施例公开了一种成员载波分配方法、装置及计算机存储介质，所述方法包括：确定小区内当前可分配的成员载波中存在频率超过预设阈值的成员载波时，根据所述频率超过预设阈值的成员载波的覆盖范围，更新小区内用户终端的频域度量值；根据更新后的频域度量值确定频域优先级，并根据所述频域优先级为小区内用户终端分配所述频率超过预设阈值的成员载波。

Description

成员载波分配方法、 装置及计算 储介庸 技术领域
本发明涉及通信技术， 尤其涉及一种成员载波分配方法、 装置及计算 机存储介质。 背景技术
随着高速铁路和高速公路的快速发展， 使得未来移动通信系统面临着 越来越多的高速移动环境， 需要通信系统支持更高移动速度， 相应的， 长 期演进 ( LTE, Long Term Evolution ) 为用户终端 （ UE， User Equipment ) 在 0 ~ 15千米 /小时的低速移动场景进行优化， 保证用户终端在 15 ~ 120千 米 /小时的高速移动场景下能够实现通信系统的高性能， 并保证用户终端在 120 ~ 350千米 /小时（在某些频段甚至支持 500千米 /小时 )的高速移动场景 下能够保持蜂窝网络的移动性。
为达到高级国际移动通信 ( IMT- Advanced, International Mobile Telec ommunications-Advanced ) 100兆赫兹的系统带宽要求， 第三代合作伙伴计 划 （3GPP， 3rd Generation Partnership Project ) LTE 版本（Release ) 10 引进了载波聚合 ( C A， Carrier Aggregation )技术， 由于不同的成员载波的 无线传输特点如无线传播路径损耗和多普勒频移都不一样， 并且由于现有 的比例公平分配策略， 为小区内的用户分配成员载波时， 成员载波总是优 先分配给小区内高吞吐量的低速移动的用户终端， 导致小区内低吞吐量的 高速移动用户终端的通信质量差， 影响了用户体验。 发明内容
有鉴于此， 本发明实施例的主要目的在于提供一种成员载波分配方法、 装置和计算机存储介质， 以至少解决由于小区成员载波分配公平性低， 导 致小区内高速移动用户终端的通信质量差的问题。
为达到上述目的， 本发明实施例的技术方案是这样实现的：
本发明实施例提供了一种成员载波分配方法， 所述方法包括： 确定小区内当前可分配的成员载波中存在频率超过预设阈值的成员载 波时， 根据所述频率超过预设阈值的成员载波的覆盖范围， 更新小区内用 户终端的频域度量值；
根据更新后的频域度量值确定频域优先级， 并根据所述频域优先级为 小区内用户终端分配所述频率超过预设阈值的成员载波。
优选的， 所述确定小区内当前可分配的成员载波中存在频率超过预设 阈值的成员载波之前， 所述方法还包括： 确定小区用户终端的频域度量值为（1 + ， 为用户终端 k分
Figure imgf000004_0001
配的成员载波集合， (ο为 t时隙之前用户终端 k的平均数据传输速率， r m(t)为在 t时隙内用户终端 k在所分配的成员载波 m上达到的瞬时数据传 输速率， T为小区平均吞吐量的衡量窗口大小。
优选的， 所述根据所述频率超过预设阈值的成员载波的覆盖范围， 更 新小区内用户终端的频域度量值， 包括：
所述频率超过预设阈值的成员载波的覆盖半径大于或等于预设阈值 r2 时， 更新与小区所属基站距离大于预设阈值！^且小于预设阈值 r2的用户终 端的频域度量值为 a x FDMi , 并更新与小区所属基站距离大于或等于预设 阈值 r2的用户终端的频域度量值为 b X FDM2， 其中， FDM、 FDM2为更新 前的用户终端的频域度量值， a大于 1， b大于 a;
所述频率超过预设阈值的成员载波的覆盖半径小于预设阈值 r2时， 更 新与小区所属基站距离大于预设阈值！^且小于预设阈值 r2的用户终端的频 域度量值为 a x FDMi , 并更新与小区所属基站距离大于或等于预设阈值 r2 的用户终端的频域度量值为 0， 其中， a大于 1， FDMi为更新前的用户终端 的频域度量值。
优选的， 所述方法还包括：
在确定小区内当前可分配的成员载波中存在频率不超过所述预设阈值
∑ m (t) 的成员载波时， 根据所述确定的用户终端的频域度量值 (1 + )确定
(T - \)Rk (t) 频域优先级， 并根据所述频域优先级为小区内用户终端分配所述频率不超 过所述预设阈值的成员载波。
优选的， 所述方法还包括：
控制频率超过预设阈值的成员载波中预设数量的成员载波覆盖与小区 所属基站距离超过预设阈值 r2的区域， 并控制频率超过预设阈值的成员载 波中预设数量的成员载波覆盖与小区所属基站距离大于预设阈值 且小于 预设阈值 r2的区域；
控制频率未超过预设阈值的成员载波覆盖与小区所属基站距离小于或 等于预设阈值！^的区域。
本发明实施例还提供了一种计算机存储介质， 所述计算机存储介质中 存储有计算机程序， 所述计算机程序用于执行以上所述的成员载波分配方 法。
本发明实施例还提供了一种成员载波分配装置， 所述装置包括： 第一 判断单元、 更新单元和分配单元； 其中，
所述第一判断单元， 配置为判断小区内当前可分配的成员载波中是否 存在频率超过预设阈值的成员载波；
所述更新单元， 配置为在所述判断单元的判断结果为是时， 根据所述 频率超过预设阈值的成员载波的覆盖范围， 更新小区内用户终端的频域度 量值；
所述分配单元， 配置为根据所述更新单元确定的频域度量值确定频域 优先级， 并根据所述频域优先级为小区内用户终端分配所述频率超过预设 阈值的成员载波。
优选的， 所述装置还包括：
确定单元， 配置为所述第一判断单元判断小区内当前可分配的成员载 波中是否存在频率超过预设阈值的成员载波之前， 确定小区用户终端的频 ∑ m(t)
域度量值为（i+( i) ? ())， G为用户终端 k分配的成员载波集合， ¾(t)为 t时隙之前用户终端 k的平均数据传输速率， rm(t)为在 t时隙内用户终端 k 在所分配的成员载波 m上达到的瞬时数据传输速率， T为用户终端 k平均 吞吐量的衡量窗口大小。
优选的， 所述更新单元， 还配置为所述频率超过预设阈值的成员载波 的覆盖半径大于或等于预设阈值 r2时， 更新与小区所属基站距离大于预设 阈值！^且小于预设阈值 r2的用户终端的频域度量值为 axFDMi, 并更新与 小区所属基站距离大于或等于预设阈值 r2的用户终端的频域度量值为 bx FDM2， 其中， FDM FDM2为更新前的用户终端的频域度量值， a大于 1， b大于 a;
所述频率超过预设阈值的成员载波的覆盖半径小于预设阈值 r2时， 更 新与小区所属基站距离大于预设阈值！^且小于预设阈值 r2的用户终端的频 域度量值为 axFDMi, 并更新与小区所属基站距离大于或等于预设阈值 r2 的用户终端的频域度量值为 0， 其中， a大于 1， FDMi为更新前的频域度量 值。
优选的， 所述装置还包括：
第二判断单元， 配置为判断小区内当前可分配的成员载波中是否存在 频率不超过所述预设阈值的成员载波；
所述分配单元， 还配置为在所述第二判断单元的判断结果为否时， 根
∑ m (t)
据所述确定的用户终端的频域度量值 (l + ^ )确定频域优先级， 并根
(T - \)Rk (t) 据所述频域优先级为小区内用户终端分配所述频率不超过所述预设阈值的 成员载波。
优选的， 所述装置还包括：
控制单元， 配置为控制频率超过预设阈值的成员载波中预设数量的成 员载波覆盖与小区所属基站距离超过预设阈值 r2的区域， 并控制频率超过 预设阈值的成员载波中预设数量的成员载波覆盖与小区所属基站距离大于 预设阈值 且小于预设阈值 r2的区域；
控制频率未超过预设阈值的成员载波覆盖与小区所属基站距离小于或 等于预设阈值！^的区域。
本发明实施例所提供的技术方案中， 确定小区内当前可分配的成员载 波为频率超过预设阈值的成员载波时， 根据所述成员载波的覆盖范围， 更 新小区内用户终端的频域度量值， 当用户终端在小区边缘区域和中部区域 高速移动时， 能够提高距离小区所属基站大于预设阈值！^且小于预设阈值 r2、 以及距离小区所属基站超过预设阈值 r2的用户终端的优先级， 保证了成 员载波分配的公平性， 提高了高速移动用户终端的数据吞吐量， 从而保证 了用户终端的通信质量。 附图说明
图 la为本发明实施例中成员载波分配方法的实现流程示意图； 图 lb为本发明实施例中小区用户终端的分布示意图；
图 2为本发明实施例中成员载波分配装置的组成结构示意图； 图 3为本发明实施例中成员载波分配的实现流程示意图。 具体实施方式
下面结合附图及具体实施例对本发明^:进一步详细的说明。
本发明实施例记载一种成员载波分配方法， 图 la为本发明实施例中成 员载波分配方法的实现流程示意图，如图 la所示，所述方法包括以下步骤： 步骤 101 :确定小区内当前可分配的成员载波中存在频率超过预设阈值 的成员载波时， 根据所述频率超过预设阈值的成员载波的覆盖范围， 更新 小区内用户终端的频域度量值。
其中， 步骤 101 之前， 根据比例公平分配策略， 确定小区内用户终端 的时域度量值 ( TDM， Time Domain Metric )为 ， 其中， D(j, t)为用户
R(i, t)
终端 i在时隙 t达到的吞吐量， 为用户终端 i在 t个时隙内的平均吞吐 量； 还根据比例公平分配策略确定小区用户终端的频域度量值 （FDM，
Frequenc 为用户终端 k分配
Figure imgf000008_0001
的成员载波集合， ¾(0为 t时隙之前用户终端 k的平均数据传输速率， rk mW 为在 t时隙内用户终端 k在所分配的成员载波 m上达到的瞬时数据传输速 率， T为小区平均吞吐量的衡量窗口大小。
本发明实施例中小区用户的分布示意图如图 lb所示， 与小区所属基站 距离不超过预设阈值 ii的 （ri、 r2的值根据布网情况和网络状况预设）用户 终端为小区核心区域内的用户终端， 与小区所属基站距离大于预设阈值 且小于预设阈值 r2的用户终端为小区中部区域内的用户终端， 与基站距离 大于或等于预设阈值 r2的用户终端为小区边缘区域内的用户终端， 小区边 缘区域用户终端和小区中部区域用户终端高速移动（即时速 15千米 /小时或 以上） 时分配的成员载波在资源块（ Resource Block )上的信噪比 （ SNR， Signal-to-Noise-Ratio )较小， 其瞬时数据传输速率^ (0也较小， 从而其频 域度量值也较小， 由于比例公平策略根据频域度量值的大小确定频域优先 级， 并根据频域优先级为用户终端分配成员载波， 因此小区边缘区域用户 终端和小区中部区域用户终端高速移动时分配的成员载波较少， 导致数据 吞吐量明显低于小区核心区域用户终端， 影响了小区边缘区域用户终端和 小区中部区域用户终端的通信质量。
根据上述情况， 发明人发现， 在为小区边缘区域用户终端和小区中部 区域用户终端分配成员载波时， 若按照预设幅度提高小区边缘区域用户终 端和小区中部区域用户终端的频域度量值， 会明显提高为小区边缘区域用 户终端和小区中部区域用户终端成员载波的几率， 从而提高数据吞吐量； 并且， 发明人还发现： 成员载波具有相同的覆盖范围时， 由于频率低于预 设阈值的成员载波的信道衰落较小， 因此用户终端会优先要求分配信道条 件较好的频率低的成员载波， 而且小区不同区域内的用户终端数量由高到 低依次为： 小区核心区域、 小区中部区域、 小区边缘区域， 因此， 本发明 实施例中， 覆盖小区核心区域、 小区中部区域和小区边缘区域的成员载波 的频率依次增高， 举例来说， 控制频率不超过预设阈值的成员载波覆盖小 区核心区域 (即距离小区所属基站小于或等于 的区域）， 控制频率高于预 设阈值的成员载波覆盖小区中部区域（即距离小区所属基站大于 且小于 r2的区域）和小区边缘区域（即小区中距离小区所属基站大于 r2的区域）， 覆盖小区边缘区域成员载波的频率高于覆盖小区中部区域的成员载波的频 率；
并且， 由于小区边缘区域及小区中部区域用户终端的路径损耗较大， 因此本发明实施例中频率高于预设阈值的成员载波使用高功率发射， 以使 频率高于预设阈值的成员载波覆盖小区中部区域和小区边缘区域； 由于小 区核心区域用户终端的信道条件好， 降低发射功率并不会影响其通信质量， 因此本发明实施例中还将频率不超过预设阈值的成员载波使用低功率发 射， 以使频率不超过预设阈值的成员载波覆盖小区核心区域。 需要说明的是， 由于成员载波由小区所属基站发射， 因此覆盖小区中 部区域（即距离小区所属基站大于 ri且小于 r2的区域）频率高于预设阈值 的成员载波， 也会覆盖小区核心区域（即距离小区所属基站小于或等于 的区域）， 覆盖小区边缘区域（即小区中距离小区所属基站大于 r2的区域） 的成员载波， 同时覆盖了小区核心区域和中部区域（即距离小区所属基站 小于或等于 r2的区域）。
例如， 长期演进增强（LTE-A， Long Term Evolution- Advanced )的部署 频段包括 ： 450 ~ 470兆赫兹 ( MHz )， 698 ~ 862MHz， 790 ~ 862MHz， 2.3 ~ 2.4吉赫兹（GHz )， 3.4 - 4.2GHz, 4.4 ~ 4.99GHz。
相应的， 在 LTE-A 的小区中， 控制上述频段中频率未超过预设频率
862MHz的频段， 即： 450 ~ 470MHz， 698 ~ 862MHz， 790 - 862MHz, 对 应的成员载波覆盖小区核心区域：
控制上述频率超过预设阈值 1GHz的频段中频率最低的 2个频段， 即： 2.3 ~ 2.4GHz， 1 ~ 2GHz, 对应的成员载波覆盖小区中部区域， 相应的， 也 覆盖了小区核心区 i或；
控制上述频率超过预设阈值 1GHz的频段中频率最高的 2个频段， 即 3.4 - 4.2GHz, 4.4 ~ 4.99GHz， 对应的成员载波覆盖小区边缘区域， 即覆盖 整个小区。
图 lb为本发明实施例中小区用户终端的分布示意图， 下面结合图 lb， 以用户终端均匀分布的小区为例， 说明本发明实施例中如何使用 L个成员 载波覆盖小区的不同区域， 设小区核心区域、 小区中部区域、 小区边缘区 域覆盖成员载波的数量分别为 X、 Υ、 Ζ。
对于 Ζ，在以下两种情况： （ 1 )小区核心区域和小区中部区域内的用户 终端分配全部 L个成员载波； （2 ) 小区核心区域和小区中部区域内的用户 终端分配 L个成员载波中除去 Ζ个成员载波的 （L - Z )个成员载波， 则可 冬寻
Figure imgf000011_0001
L-Z Z (2) 由式（1 ) (2)可得 Z的取值范围为
署
对于 Y，在以下两种情况： （ 1 )小区核心区域内的用户终端分配全部 L 个成员载波； （2) 小区核心区域和小区边缘区域内的用户终端分配除去 L 个成员载波中 Υ个成员载波的之外的 （L-Y)个成员载波， 则可得出：
\-β-λ β
L =Ϋ (3)
\-β-λ β
L-Z-Y Υ (4) 由式（3) (4)可得 Υ的取值范围为 , (L Z 2 X 7l2))。
2r2 -rx 3r2 -2rx 通过上述取值范围， 可确定当小区覆盖有 20个成员载波时， 确定 14 个频率低于预设阈值的成员载波覆盖小区核心区域， 4个频率高于预设阈值 的成员载波覆盖小区中部区域， 2个高频高于预设阈值的成员载波覆盖小区 边缘区域， 即覆盖小区全部区域。
本发明实施例中， 成员载波的覆盖范围小于预设阈值 r2时， 更新距离 小区所属基站距离大于预设阈值！^且小于预设阈值 r2的用户终端的频域度 量值为 ax FDM 其中 a 大于 1， FDM 为更新前的频域度量值， 即
(1+ ， 并更新距离小区所属基站大于或等于预设阈值1 "2的用户终
Figure imgf000011_0002
端的频域度量值为 0。
其中， 由于成员载波的覆盖半径小于预设阈值 r2时标识所述成员载波 没有覆盖小区边缘区域， 因此无法分配给小区边缘区域内的用户终端， 即 距离小区所属基站大于或等于预设阈值 r2的用户终端， 相应的将所述小区 边缘区域内的用户终端的频域度量值置 0，以使该成员载波不会分配给小区 边缘区域内的用户终端。
本发明实施例中， 所述成员载波的覆盖半径大于或等于预设阈值 r2时， 更新距离小区所属基站距离大于预设阈值！^且小于预设阈值 r2的用户终端 的频域度量值为 a x FDMi， FDMi 为更新前的频域度量值， 即
∑ m (t)
(1 + (r- l)R (t))， 并更新距离小区所属基站大于或等于预设阈值1 "2的用户终 端的频域度量值为 b X FDM2， 其中 b大于 a。
其中， 成员载波的覆盖半径大于或等于预设阈值 r2标识该成员载波覆 盖小区边缘区域， 相应的， 提高小区边缘区域和小区中部区域内的用户终 端频域度量值， 且使小区边缘区域内的用户终端的频域度量值高于小区中 部区域用户终端的频域度量值， 以提高该成员载波分配给小区边缘用户终 端和小区中部区域用户终端的几率。
步骤 102: 根据更新后的频域度量值确定频域优先级， 并根据所述频域 优先级为小区内用户终端分配所述频率超过预设阈值的成员载波。
其中， 将所述更新后的频域度量值由高到低的顺序确定为用户终端的 频域优先级， 按照优先级从高到低的顺序为用户终端分配成员载波。
由于本发明实施例使用低频成员载波（即频率低于预设阈值的成员载 波）覆盖小区核心区域， 当确定当前可分配的成员载波中存在频率不超过
∑ m (t) 预设阈值的成员载波时， 根据所述确定的频域度量值 (1 + )由高到
(T - \)Rk (t) 低的顺序确定为用户终端的频域优先级， 按照优先级从高到低的顺序为用 户终端分配所述频率不超过预设阈值的成员载波。
本发明实施例还提供了一种计算机存储介质， 所述计算机存储介质中 存储有计算机程序， 所述计算机程序用于执行以上实施例所述的成员载波 分配方法。
本发明实施例还记载一种成员载波分配装置， 图 2 为本发明实施例中 成员载波分配装置的组成结构示意图， 如图 2所示， 所述装置包括： 第一 判断单元 21、 更新单元 22和分配单元 23; 其中，
所述第一判断单元 21， 配置为判断小区内当前可分配的成员载波中是 否存在频率超过预设阈值的成员载波；
所述更新单元 22， 配置为在所述第一判断单元 21的判断结果为是时， 根据所述频率超过预设阈值的成员载波的覆盖范围， 更新小区内用户终端 的频域度量值；
所述分配单元 23，配置为根据所述更新单元 22确定的频域度量值确定 频域优先级， 并根据所述频域优先级为小区内用户终端分配所述频率超过 预设阈值的成员载波。
优选的， 所述装置还包括：
确定单元 24，配置为所述第一判断单元 21判断小区内当前可分配的成 员载波中是否存在频率超过预设阈值的成员载波之前， 确定小区用户终端
∑ m (t)
的频域度量值为（1+^^^)， G为用户终端 k分配的成员载波集合， Rk(t) 为 t时隙之前用户终端 k的平均数据传输速率， r m (t)为在 t时隙内用户终端 k在所分配的成员载波 m上达到的瞬时数据传输速率， T为小区平均吞吐量 的衡量窗口大小。
优选的， 所述更新单元 22， 还配置为所述频率超过预设阈值的成员载 波的覆盖半径大于或等于预设阈值 r2时， 更新与小区所属基站距离大于预 设阈值 且小于预设阈值 r2的用户终端的频域度量值为 a X FDMj , 并更新 与小区所属基站距离大于或等于预设阈值 r2的用户终端的频域度量值为 b x FDM2, 其中， FDM FDM2为更新前的用户终端的频域度量值， a大于 1， b大于 a;
所述频率超过预设阈值的成员载波的覆盖半径小于预设阈值 r2时， 更 新与小区所属基站距离大于预设阈值！^且小于预设阈值 r2的用户终端的频 域度量值为 a x FDMi , 并更新与小区所属基站距离大于或等于预设阈值 r2 的用户终端的频域度量值为 0， 其中， a大于 1， FDMi为更新前的频域度量 值。
优选的， 所述装置还包括；
第二判断单元 25， 配置为判断小区内当前可分配的成员载波中是否存 在频率不超过所述预设阈值的成员载波；
所述分配单元 23，还配置为在所述第二判断单元 25的判断结果为否时，
∑ m (t)
根据所述确定的用户终端的频域度量值 (l+^ )确定频域优先级， 并
(T - \)Rk (t) 根据所述频域优先级为小区内用户终端分配所述频率不超过所述预设阈值 的成员载波。
优选的， 所述装置还包括：
控制单元 26， 配置为控制频率超过预设阈值的成员载波中预设数量的 成员载波覆盖与小区所属基站距离超过预设阈值 r2的区域， 并控制频率超 过预设阈值的成员载波中预设数量的成员载波覆盖与小区所属基站距离大 于预设阈值 且小于预设阈值 r2的区域；
控制频率未超过预设阈值的成员载波覆盖与小区所属基站距离小于或 等于预设阈值！^的区域。
实际应用中， 所述第一判断单元 21、 更新单元 22、 分配单元 23、 确定 单元 24、第二判断单元 25和控制单元 26均可由中央处理器（ CPU, Central Processing Unit ), 数字信号处理器（DSP， Digital Signal Processor )或现场 可编程门阵列 （FPGA， Field Programmable Gate Array ) 实现。
下面以带外非相邻的载波聚合场景为例对本发明作进一步说明， 本发 明实施例中的小区示意图如图 lb所示， 小区均匀分布 100个用户终端， 小 区中覆盖 20 个成员载波， 成员载波的频率为 {f ， f2， …， f20}， 其中 fi<f2<...<fi4<300 千赫兹 <f15<...<f20， 并且每个成员载波有相同的带宽， 即 都具有相同数量的资源块， 根据本发明实施例中所述确定的覆盖小区边缘
9R
区域的成员载波数量的取值范围 Li: ， 和覆盖小区中
9Rl 部区域的成员载波数量的取值范围 (^ 2r2 -rx (L: 3rz 22 x -2rx l2))， 控制频率未超 过预设阈值 300千赫兹的 14个低频成员载波， 即 f ~ f14对应的成员载波覆 盖小区核心区域， 控制频率超过预设阈值 300千赫兹的成员载波中， 频率 最高的 2个高频成员载波， 即 9、 f20对应的成员载波覆盖整个小区， 控制 其余的 4个高频成员载波， 即 f15~f18对应的成员载波覆盖小区中部区域， 成员载波的覆盖范围通过控制成员载波的发射功率实现。
基于上述场景， 图 3 为本发明实施例中成员载波分配的实现流程示意 图， 如图 3所示， 包括以下步骤：
步骤 301: 确定用户终端的频域度量值。
步骤 301之前， 根据比例公平分配策略， 确定用户终端的时域度量值。 用 ,("，0表示在时隙 t，用户 i在成员载波的第 n个资源块 RBn上的 SNR， 则 Υ ,ή为 A(")¾ ("，01， 其中， Pk ( n )是在成员载波 k上第 n个资源块 RBn 的发射功率； ¾ (n,t)是用户终端 i在 RBn上的复合信道增益； NO是用户 终端 i在 ^¾1上的噪声功率； Pk为成员载波 k的发射功率。 因此在时隙 t用 户终端 i在 RBn上的瞬时速率 η (n, t)为 log(l + βγ, (n,t)) , 其中， W是 RBn的 带宽， β为信噪比差额， 其值为卜 1.5〃"(5 ¾")] [-1.5/ln (5Pen)], Pen为目 标误比特率。
步骤 302:判断小区内当前可分配的成员载波中是否存在频率超过预设 阈值的成员载波， 如果存在， 则执行步骤 303， 否则执行步骤 306。
步骤 303: 判断成员载波是否覆盖小区边缘区域， 如果覆盖， 则执行步 骤 304; 否则， 执行步骤 305。
步骤 304: 更新小区中部区域内的用户终端的频域度量值为 a x FDMi , 更新小区边缘区域内的用户终端的频域度量值为 b FDM2。
更新距离小区所属基站距离大于预设阈值！^且小于预设阈值 r2的用户 终端， 即小区中部区域内的用户终端的频域度量值为 a x FDMi , 更新距离 小区所属基站大于或等于预设阈值 r2的用户终端， 即小区边缘区域用户终 端的频域度量值为 b X FDM2， 其中 FDM i、 FDM2为更新前的用户终端的频 域度量值， a大于 1， b大于 a。
步骤 305： 更新小区中部区域内的用户终端的频域度量值为 a X FDMj， 并更新小区边缘区域内的用户终端的频域度量值为 0。
更新距离小区所属基站距离大于预设阈值！^且小于预设阈值 r2的用户 终端的频域度量值为 a x FDMi , 并更新距离小区所属基站大于或等于预设 阈值 r2的用户终端的频域度量值为 0， 其中 a大于 1， FDM 为更新前的用 户终端的频域度量值。
步骤 306: 根据当前频域度量值由高到低的顺序， 确定用户终端的频域 优先级， 并根据所述确定频域优先级分配成员载波给所述用户终端。
其中， 步骤 303 中可分配的成员载波为频率超过预设阈值， 即标识成 员载波属于 14个频率最低的成员载波的集合， 由于该成员载波仅分配给小 区核心区域内的用户终端， 因此直接执行步骤 306， 不需要调整小区中部区 域和 d、区边缘区域内的用户终端的频域度量值。
通过本实施例， 可以实现以下技术效果： 小区中部区域用户终端可分配成员载波的集合为 {f15， f16， …， f20} , 各 用户终端按上述更新后的频域度量值 a X FDMj由高到低的顺序分配成员载 波； 小区边缘区域内的用户终端可分配频率最高的 2个成员载波， 即 f19、 f2o对应的成员载波，根据更新后的频域度量值 bxFDM2确定的频域优先级， 为小区边缘区域内的用户终端分配成员载波， 即， 对于 f19， f2。对应的成员 载波， 小区边缘区域内的用户终端具有最高的分配优先级， 小区中部用户 区域内用户终端的优先级次之， 小区核心区域内用户终端的优先级最低； 对于 f15 ~ f18对应的成员载波， 小区边缘区域内的用户终端不能分配， 小区 中部区域用户终端具有分配的最高优先级， 小区核心区域用户终端的优先 级次之； 对于 f ~ f14对应的成员载波， 只有小区核心区域用户终端可分配； 从而能够提高小区边缘区域内用户终端的吞吐量， 保证通信质量； 并 且， 将具有较好的信道条件的低频成员载波控制在在小区核心区域， 保证 小区的吞吐量维持在较高水平。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。 工业实用性
本发明实施例中， 确定小区内当前可分配的成员载波中存在频率超过 预设阈值的成员载波时， 根据所述频率超过预设阈值的成员载波的覆盖范 围， 更新小区内用户终端的频域度量值； 根据更新后的频域度量值确定频 域优先级， 并根据所述频域优先级为小区内用户终端分配所述频率超过预 设阈值的成员载波。 采用本发明实施例的技术方案， 能够解决由于小区成 员载波分配公平性低， 导致高速移动的用户终端的通信质量差的问题。

Claims

权利要求书
1、 一种成员载波分配方法， 所述方法包括：
确定小区内当前可分配的成员载波中存在频率超过预设阈值的成员载 波时， 根据所述频率超过预设阈值的成员载波的覆盖范围， 更新小区内用 户终端的频域度量值；
根据更新后的频域度量值确定频域优先级， 并根据所述频域优先级为 小区内用户终端分配所述频率超过预设阈值的成员载波。
2、 根据权利要求 1所述的方法， 其中， 所述确定小区内当前可分配的 成员载波中存在频率超过预设阈值的成员载波之前， 所述方法还包括：
∑ m (t)
确定小区用户终端的频域度量值为（1 +^ )， G为用户终端 k分
(T - \)Rk (t)J
配的成员载波集合， (ο为 t时隙之前用户终端 k的平均数据传输速率， r m(t)为在 t时隙内用户终端 k在所分配的成员载波 m上达到的瞬时数据传 输速率， T为小区平均吞吐量的衡量窗口大小。
3、 根据权利要求 1或 2所述的方法， 其中， 所述根据所述频率超过预 设阈值的成员载波的覆盖范围， 更新小区内用户终端的频域度量值， 包括： 所述频率超过预设阈值的成员载波的覆盖半径大于或等于预设阈值 r2 时， 更新与小区所属基站距离大于预设阈值！^且小于预设阈值 r2的用户终 端的频域度量值为 a x FDMi , 并更新与小区所属基站距离大于或等于预设 阈值 r2的用户终端的频域度量值为 b X FDM2， 其中， FDM、 FDM2为更新 前的用户终端的频域度量值， a大于 1， b大于 a;
所述频率超过预设阈值的成员载波的覆盖半径小于预设阈值 r2时， 更 新与小区所属基站距离大于预设阈值！^且小于预设阈值 r2的用户终端的频 域度量值为 a x FDMi , 并更新与小区所属基站距离大于或等于预设阈值 r2 的用户终端的频域度量值为 0， 其中， a大于 1， FDMi为更新前的用户终端 的频域度量值。
4、 根据权利要求 2或 3所述的方法， 其中， 所述方法还包括： 在确定小区内当前可分配的成员载波中存在频率不超过所述预设阈值
∑ m (t) 的成员载波时， 根据所述确定的用户终端的频域度量值 (1 + )确定
(T - \)Rk (t) 频域优先级， 并根据所述频域优先级为小区内用户终端分配所述频率不超 过所述预设阈值的成员载波。
5、 根据权利要求 1、 2、 3或 4所述的方法， 其中， 所述方法还包括： 控制频率超过预设阈值的成员载波中预设数量的成员载波覆盖与小区 所属基站距离超过预设阈值 r2的区域， 并控制频率超过预设阈值的成员载 波中预设数量的成员载波覆盖与小区所属基站距离大于预设阈值 且小于 预设阈值 r2的区域；
控制频率未超过预设阈值的成员载波覆盖与小区所属基站距离小于或 等于预设阈值！^的区域。
6、 一种成员载波分配装置， 所述装置包括： 第一判断单元、 更新单元 和分配单元； 其中，
所述第一判断单元， 配置为判断小区内当前可分配的成员载波中是否 存在频率超过预设阈值的成员载波；
所述更新单元， 配置为在所述第一判断单元的判断结果为是时， 根据 所述频率超过预设阈值的成员载波的覆盖范围， 更新小区内用户终端的频 域度量值；
所述分配单元， 配置为根据所述更新单元确定的频域度量值确定频域 优先级， 并根据所述频域优先级为小区内用户终端分配所述频率超过预设 阈值的成员载波。
7、根据权利要求 6所述的成员载波分配装置， 其中， 所述装置还包括： 确定单元， 配置为所述第一判断单元判断小区内当前可分配的成员载 波中是否存在频率超过预设阈值的成员载波之前， 确定小区用户终端的频 域度量值为（i+ ( i) ? ( ))， G为用户终端 k分配的成员载波集合， ¾(t)为 t时隙之前用户终端 k的平均数据传输速率， r m (t)为在 t时隙内用户终端 k 在所分配的成员载波 m上达到的瞬时数据传输速率， T为小区平均吞吐量 的衡量窗口大小。
8、 根据权利要求 6或 7所述的成员载波分配装置， 其中，
所述更新单元， 还配置为所述频率超过预设阈值的成员载波的覆盖半 径大于或等于预设阈值 r2时， 更新与小区所属基站距离大于预设阈值 且 小于预设阈值 r2的用户终端的频域度量值为 a x FDMi , 并更新与小区所属 基站距离大于或等于预设阈值 r2的用户终端的频域度量值为 b X FDM2， 其 中， FDM FDM2为更新前的用户终端的频域度量值， a大于 1， b大于 a; 所述频率超过预设阈值的成员载波的覆盖半径小于预设阈值 r2时， 更 新与小区所属基站距离大于预设阈值！^且小于预设阈值 r2的用户终端的频 域度量值为 a x FDMi , 并更新与小区所属基站距离大于或等于预设阈值 r2 的用户终端的频域度量值为 0， 其中， a大于 1， FDMi为更新前的频域度量 值。
9、 根据权利要求 7或 8所述的成员载波分配装置， 其中， 所述装置还 包括：
第二判断单元， 配置为判断小区内当前可分配的成员载波中是否存在 频率不超过所述预设阈值的成员载波；
所述分配单元， 还配置为在所述第二判断单元的判断结果为否时， 根
∑ m (t)
据所述确定的用户终端的频域度量值 (l + ^ )确定频域优先级， 并根 据所述频域优先级为小区内用户终端分配所述频率不超过所述预设阈值的 成员载波。
10、 根据权利要求 6、 7、 8或 9所述的成员载波分配装置， 其中， 所 述装置还包括：
控制单元， 配置为控制频率超过预设阈值的成员载波中预设数量的成 员载波覆盖与小区所属基站距离超过预设阈值 r2的区域， 并控制频率超过 预设阈值的成员载波中预设数量的成员载波覆盖与小区所属基站距离大于 预设阈值 且小于预设阈值 r2的区域；
控制频率未超过预设阈值的成员载波覆盖与小区所属基站距离小于或 等于预设阈值！^的区域。
11、 一种计算机存储介质， 所述计算机存储介质中存储有计算机程序， 所述计算机程序用于执行权利要求 1至 5任一项所述的成员载波分配方法。
PCT/CN2013/087997 2013-05-15 2013-11-28 成员载波分配方法、装置及计算机存储介质 WO2014183416A1 (zh)

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